A basic introduction of Fabric manufacturing technology. Weaving is a very important manufacturing technology. Here is a basic knowledge of Weave fabric manufacturing.
Raising is a mechanical process that uses revolving cylinders covered with metal points or abrasives to stand up the surface fibers of a fabric, creating a lofty texture. It is done on wet wool or dry cotton fabrics. Raising is used to create effects such as pile, fleece, peach skin, and a warmer, softer hand. There are two main types of raising machines - teasel raising machines and card wire raising machines. The two primary types of raising are napping, which uses metal wires to dig out fibers and create higher pile, and sueding, which uses abrasives like sandpaper for a lower, suede-like pile typically on silk fabrics.
Testing is the process or procedure to determines the quality of a product.The testing of textile products is an expensive business. A textile commercial laboratory has to be set up and furnished with a range of test equipment.Textile Testing & Quality Control (TTQC) is very important work or process in each department of export oriented industry. Buyers want quality but not quantity. In every department of textile industry quality maintained of each material, because one material’s quality depend on another’s quality. For example, if qualified fiber is inputted then output will be good yarn.
Quality control and testing are essential processes in the textile industry to ensure products meet specifications. There are several key steps:
1) Pretreatment processes like singeing, desizing, bleaching, and mercerization are tested for parameters like chemical concentrations, temperatures, and absorbency.
2) Dyeing and printing undergo physical tests for properties like colorfastness and chemical tests.
3) Finishing is tested for characteristics such as abrasion resistance, shrinkage, weather resistance, and burn resistance. Regular quality control and testing at all stages of production are vital for maintaining textile quality standards.
This presentation compares conventional and modern looms. Conventional looms operate more slowly with lower production capacity, while modern looms operate faster with higher output. Conventional looms are manually operated, while modern looms use electric power. Modern looms allow for more design variety and improved safety systems compared to conventional looms. Specific modern loom types discussed include rapier, air jet, water jet, and projectile looms, which utilize different automated processes for inserting the weft through the warp shed.
This document discusses fibre length parameters and measurement methods. It defines mean length, upper quartile length, effective length, and span length. Common measurement techniques described are hand stapling, comb sorting, photoelectric methods like Fibrograph and Shirley stapler, and the WIRA machine. Comb sorting diagrams are analyzed. The document provides details on how each measurement method works and its advantages or limitations.
Pilling is formation of little balls of fibers (pills) on the surface of a fabric which is caused by abrasion in wear.
Pilling is the tendency of fibers to come loose from a fabric surface and form balled particles of fiber
Abhi rana)4. dry laid non woven fabricsAbhishek Rana
This document discusses dry laid non-woven fabrics. It describes the four phases of non-woven technology: fiber selection, fiber preparation, web formation and layering, and bonding and stabilization of the web. It then provides details on different fiber properties and various web formation methods like carding, garnetting, air laying and centrifugal dynamic random carding. Finally, it covers bonding methods for non-wovens like needle punching, stitch bonding, thermal bonding and hydroentanglement.
Raising is a mechanical process that uses revolving cylinders covered with metal points or abrasives to stand up the surface fibers of a fabric, creating a lofty texture. It is done on wet wool or dry cotton fabrics. Raising is used to create effects such as pile, fleece, peach skin, and a warmer, softer hand. There are two main types of raising machines - teasel raising machines and card wire raising machines. The two primary types of raising are napping, which uses metal wires to dig out fibers and create higher pile, and sueding, which uses abrasives like sandpaper for a lower, suede-like pile typically on silk fabrics.
Testing is the process or procedure to determines the quality of a product.The testing of textile products is an expensive business. A textile commercial laboratory has to be set up and furnished with a range of test equipment.Textile Testing & Quality Control (TTQC) is very important work or process in each department of export oriented industry. Buyers want quality but not quantity. In every department of textile industry quality maintained of each material, because one material’s quality depend on another’s quality. For example, if qualified fiber is inputted then output will be good yarn.
Quality control and testing are essential processes in the textile industry to ensure products meet specifications. There are several key steps:
1) Pretreatment processes like singeing, desizing, bleaching, and mercerization are tested for parameters like chemical concentrations, temperatures, and absorbency.
2) Dyeing and printing undergo physical tests for properties like colorfastness and chemical tests.
3) Finishing is tested for characteristics such as abrasion resistance, shrinkage, weather resistance, and burn resistance. Regular quality control and testing at all stages of production are vital for maintaining textile quality standards.
This presentation compares conventional and modern looms. Conventional looms operate more slowly with lower production capacity, while modern looms operate faster with higher output. Conventional looms are manually operated, while modern looms use electric power. Modern looms allow for more design variety and improved safety systems compared to conventional looms. Specific modern loom types discussed include rapier, air jet, water jet, and projectile looms, which utilize different automated processes for inserting the weft through the warp shed.
This document discusses fibre length parameters and measurement methods. It defines mean length, upper quartile length, effective length, and span length. Common measurement techniques described are hand stapling, comb sorting, photoelectric methods like Fibrograph and Shirley stapler, and the WIRA machine. Comb sorting diagrams are analyzed. The document provides details on how each measurement method works and its advantages or limitations.
Pilling is formation of little balls of fibers (pills) on the surface of a fabric which is caused by abrasion in wear.
Pilling is the tendency of fibers to come loose from a fabric surface and form balled particles of fiber
Abhi rana)4. dry laid non woven fabricsAbhishek Rana
This document discusses dry laid non-woven fabrics. It describes the four phases of non-woven technology: fiber selection, fiber preparation, web formation and layering, and bonding and stabilization of the web. It then provides details on different fiber properties and various web formation methods like carding, garnetting, air laying and centrifugal dynamic random carding. Finally, it covers bonding methods for non-wovens like needle punching, stitch bonding, thermal bonding and hydroentanglement.
Milling is a process that felts wool fabrics to make them thicker, fuller, and more uniform. It involves treating wool fabrics with moisture, heat, and pressure in a milling machine. There are several types of milling depending on the chemicals used, such as alkaline milling using sodium carbonate, soap milling using soap solutions, and acid milling using diluted sulfuric acid. The objective is to felt the wool fibers together to condense and shrink the fabric while also making the weave less visible. Milling improves the strength, handle, and appearance of the wool fabric.
Spirality and shrinkage are common problems in knitted fabrics that can be influenced by various factors. [1] Spirality occurs when wales are not perpendicular to courses and is affected by yarn twist, count, fabric structure, and machine settings. [2] Shrinkage is a decrease in length or width upon washing and is mainly due to yarn swelling; it can be impacted by GSM, stitch length, and fabric type. [3] The document discusses measuring and reducing spirality and shrinkage through parameters like yarn and fabric properties as well as processing methods.
This document discusses testing methods for pilling and abrasion resistance of fabrics. It describes that pilling is the formation of small balls of entangled fibers on fabric surfaces due to rubbing, and is influenced by fiber properties like strength and stiffness. Methods to measure pilling include objective counting/weighing of pills or subjective comparison to standards. Tests for pilling include the ICI pilling box method and Martindale abrasion tester. Abrasion resistance depends on fiber type, properties, yarn twist, and fabric structure, and is measured using the Martindale abrasion tester by recording cycles until thread breakage. Grading scales are used to assess levels of pilling and abrasion damage.
Mercerization is a process that treats cotton fabrics with a cold sodium hydroxide solution. This treatment causes the cotton fibers to swell and gives the fabric an increased luster and strength. John Mercer discovered the process in 1844, though it did not become popular until H.A. Lowe improved it in 1890 by preventing shrinkage during treatment. The modern process involves bathing cotton thread in sodium hydroxide then neutralizing it with an acid. This increases the thread's luster, strength, dye affinity, and mildew resistance. Mercerization results in fiber swelling and morphology changes that allow for more dye absorption and a brighter colored fabric with better color retention after washing.
This document discusses yarn count systems. It explains that yarns come in different thicknesses and are typically sold based on weight. There are two main systems for expressing yarn count: direct and indirect. Direct systems indicate the weight of a given length of yarn, while indirect systems indicate the length of yarn in a given weight. Common direct units include tex, dtex, and ktex which measure grams per 1000 meters, 10000 meters, and 1 meter respectively. Common indirect units include Nm, Nec, and Nw which measure meters, 840-yard hanks, and 560-yard hanks per gram respectively. The document provides examples and conversion factors between different count systems.
Flexural Properties of Fiber | Flexural Properties of Textile FiberMd Rakibul Hassan
Flexural properties refer to how textile materials like fibers, yarns, and fabrics behave under bending. Flexural rigidity is the resistance of a textile fiber to bending and is measured as the couple required to bend the fiber to a unit curvature. Specific flexural rigidity expresses this value per unit linear density. Bending recovery is the ability of a fiber to recover from bending, while bending modulus is the ratio of bending stress to bending strain. Flexural properties influence behaviors like yarn structure, fabric drape and handle, recovery, wear performance, and fiber arrangement in yarns.
Warp knitting is a family of knitting methods in which the yarn zigzags along the length of the fabric, i.e., following adjacent columns ("wales") of knitting, rather than a single row ("course"). For comparison, knitting across the width of the fabric is called weft knitting.Warp knitting machines--needles are mounted collectively and rigidly in a horizontal metal bar (the needle bar that runs the full knitting width of the machine).
1. Mercerization is a finishing treatment for cotton that improves luster, hardness, and other properties by treating cotton with a strong alkaline solution.
2. It involves immersing cotton yarn or fabric under tension in a cold sodium hydroxide solution, then neutralizing it in acid. This causes swelling of the cotton fibers and increases their luster.
3. The ideal conditions for mercerization are a caustic concentration of 250-320 g/L at 18-20°C for 30-60 seconds, as this provides the best luster with minimal shrinkage.
The document summarizes projectile weaving, which uses gripper projectiles to insert weft threads into warp threads. Key points:
- Projectile weaving machines were invented in 1924 and introduced commercially in 1953. They use small, bullet-like projectiles to insert weft threads at high speeds up to 1500 picks per minute.
- Projectile looms produce fabrics with good quality at high efficiency and low energy use. They can weave a wide variety of yarns from fine to coarse.
- The projectile is propelled through the warp shed using stored energy from a twisted metal torsion bar, allowing very high insertion speeds. It grips the weft securely and deposits it without
The document discusses the process of mercerizing cotton fabrics. Mercerizing involves treating cotton yarns or fabrics with a cold or hot solution of sodium hydroxide (caustic soda) under tension to improve properties like strength, luster, and dye affinity. Specifically, swelling the cotton fibers in the caustic soda solution changes their cross-sectional shape and increases luster when the tension is maintained during washing. There are different methods for mercerizing yarns, knits, and woven fabrics either as batches or continuously. The advantages of mercerizing include brighter dye colors, better color retention after washing, and increased strength, smoothness, and resistance to damage.
This document provides an overview of drawing and texturizing processes in the textile industry. It begins with an introduction to filament production from man-made materials and defines drawing as a process used to orient polymer molecules and increase filament strength. Texturizing is defined as introducing crimps, loops or coils to filaments to create bulk. Common texturizing methods like false twist, draw texturizing and air jet texturizing are described. The document concludes with links to related textile technology Facebook pages.
fiber strength and fiber fineness are described in detail about the machinery and discussed about new computerized testing machines which are used to determine the strength and fineness of the fiber.
This document provides information on extra warp and weft figured fabrics. It discusses two methods of producing these fabrics: 1) using extra warp threads and 2) using extra weft threads. For extra warp fabrics, a separate warp beam is needed along with a dobby mechanism. For extra weft, a drop box mechanism is required. Both methods allow figuring in single or multiple colors. The document provides examples of motif designs and how the ground and extra threads interlace to produce the final figured fabric pattern.
Open-end spinning or rotor spinning is a technology for creating yarn without using a spindle. It separates fiber slivers into single fibers using an air stream and deposits them onto a collecting surface where they are twisted into yarn as it is drawn off. The principle is similar to a clothes dryer where individual sheets can be pulled out while twisting together. Fibers are fed onto the collecting surface which is continuously moving, aligning the fibers and twisting them into a thread that is wound onto a bobbin. Open-end spinning allows internal fiber stresses to relax and imparts twist directly onto the yarn end rather than drafting fibers. This makes the process faster and less labor intensive than ring spinning.
Chemicals and Auxiliaries used in Textile Wet ProcessingMashrur Wasity
This document discusses various chemicals and auxiliaries used in textile wet processing. It defines auxiliaries as chemicals that help processing operations like preparation, dyeing and printing work more efficiently. Some common auxiliaries mentioned include surfactants, wetting agents, sequestering agents, dispersing agents and emulsifiers. Basic chemicals used in wet processing like acids, bases, salts, oxidizing and reducing agents are also discussed. The roles and examples of various chemicals are provided in concise points.
Study of relationship between seam slippage& strengthAbdur Rahim Khan
1. The document outlines a research project on analyzing factors that influence seam slippage in woven garments.
2. The project will examine the effect of fabric properties like GSM, cover factor, and thickness on seam slippage strength. Fabric samples with different values for these properties will be stitched and tested.
3. Mathematical relationships and graphs will be used to determine the dependency and correlation between seam slippage strength and the structural parameters of the woven fabrics. Test results and data analysis will be included in the project report.
Lappet weaving and swivel weaving are types of weaving that produce decorative patterns. Lappet weaving introduces extra warp threads into a plain weave base to create figures, while swivel weaving introduces extra weft threads into the base fabric to produce spot effects. Both weaving styles can produce attractive designs but lappet weaving is more durable, and swivel weaving may cause roughness on the back side of the fabric. Common fabrics produced include madras, grenadine and dotted swiss. The key difference between the two is that in swivel weaving, the extra weft threads are cut off at the end of each design while in lappet weaving the design thread is
The document provides an overview of looms and loom mechanisms. It discusses the basic components and functions of a loom, including the heald shaft, sley or lay, shuttle, shuttle box, picker, and reed. It describes how these components work together to form fabric by interlacing the warp and weft threads. The passage of materials through a typical loom is also illustrated in a diagram.
A basic introduction of Fabric manufacturing technology. Weaving is a very important manufacturing technology. Here is a basic knowledge of Weave fabric manufacturing.
This document discusses the operational principles of loom motions. It begins by defining a loom and classifying the main types. It then describes the important parts of a loom, including the heald shaft and shuttle. The document explains the weaving process and the primary loom motions of shedding, picking, and beating up. It also discusses the secondary motions of take up and let off, and the auxiliary motions including warp stop, weft stop, and warp protector.
Milling is a process that felts wool fabrics to make them thicker, fuller, and more uniform. It involves treating wool fabrics with moisture, heat, and pressure in a milling machine. There are several types of milling depending on the chemicals used, such as alkaline milling using sodium carbonate, soap milling using soap solutions, and acid milling using diluted sulfuric acid. The objective is to felt the wool fibers together to condense and shrink the fabric while also making the weave less visible. Milling improves the strength, handle, and appearance of the wool fabric.
Spirality and shrinkage are common problems in knitted fabrics that can be influenced by various factors. [1] Spirality occurs when wales are not perpendicular to courses and is affected by yarn twist, count, fabric structure, and machine settings. [2] Shrinkage is a decrease in length or width upon washing and is mainly due to yarn swelling; it can be impacted by GSM, stitch length, and fabric type. [3] The document discusses measuring and reducing spirality and shrinkage through parameters like yarn and fabric properties as well as processing methods.
This document discusses testing methods for pilling and abrasion resistance of fabrics. It describes that pilling is the formation of small balls of entangled fibers on fabric surfaces due to rubbing, and is influenced by fiber properties like strength and stiffness. Methods to measure pilling include objective counting/weighing of pills or subjective comparison to standards. Tests for pilling include the ICI pilling box method and Martindale abrasion tester. Abrasion resistance depends on fiber type, properties, yarn twist, and fabric structure, and is measured using the Martindale abrasion tester by recording cycles until thread breakage. Grading scales are used to assess levels of pilling and abrasion damage.
Mercerization is a process that treats cotton fabrics with a cold sodium hydroxide solution. This treatment causes the cotton fibers to swell and gives the fabric an increased luster and strength. John Mercer discovered the process in 1844, though it did not become popular until H.A. Lowe improved it in 1890 by preventing shrinkage during treatment. The modern process involves bathing cotton thread in sodium hydroxide then neutralizing it with an acid. This increases the thread's luster, strength, dye affinity, and mildew resistance. Mercerization results in fiber swelling and morphology changes that allow for more dye absorption and a brighter colored fabric with better color retention after washing.
This document discusses yarn count systems. It explains that yarns come in different thicknesses and are typically sold based on weight. There are two main systems for expressing yarn count: direct and indirect. Direct systems indicate the weight of a given length of yarn, while indirect systems indicate the length of yarn in a given weight. Common direct units include tex, dtex, and ktex which measure grams per 1000 meters, 10000 meters, and 1 meter respectively. Common indirect units include Nm, Nec, and Nw which measure meters, 840-yard hanks, and 560-yard hanks per gram respectively. The document provides examples and conversion factors between different count systems.
Flexural Properties of Fiber | Flexural Properties of Textile FiberMd Rakibul Hassan
Flexural properties refer to how textile materials like fibers, yarns, and fabrics behave under bending. Flexural rigidity is the resistance of a textile fiber to bending and is measured as the couple required to bend the fiber to a unit curvature. Specific flexural rigidity expresses this value per unit linear density. Bending recovery is the ability of a fiber to recover from bending, while bending modulus is the ratio of bending stress to bending strain. Flexural properties influence behaviors like yarn structure, fabric drape and handle, recovery, wear performance, and fiber arrangement in yarns.
Warp knitting is a family of knitting methods in which the yarn zigzags along the length of the fabric, i.e., following adjacent columns ("wales") of knitting, rather than a single row ("course"). For comparison, knitting across the width of the fabric is called weft knitting.Warp knitting machines--needles are mounted collectively and rigidly in a horizontal metal bar (the needle bar that runs the full knitting width of the machine).
1. Mercerization is a finishing treatment for cotton that improves luster, hardness, and other properties by treating cotton with a strong alkaline solution.
2. It involves immersing cotton yarn or fabric under tension in a cold sodium hydroxide solution, then neutralizing it in acid. This causes swelling of the cotton fibers and increases their luster.
3. The ideal conditions for mercerization are a caustic concentration of 250-320 g/L at 18-20°C for 30-60 seconds, as this provides the best luster with minimal shrinkage.
The document summarizes projectile weaving, which uses gripper projectiles to insert weft threads into warp threads. Key points:
- Projectile weaving machines were invented in 1924 and introduced commercially in 1953. They use small, bullet-like projectiles to insert weft threads at high speeds up to 1500 picks per minute.
- Projectile looms produce fabrics with good quality at high efficiency and low energy use. They can weave a wide variety of yarns from fine to coarse.
- The projectile is propelled through the warp shed using stored energy from a twisted metal torsion bar, allowing very high insertion speeds. It grips the weft securely and deposits it without
The document discusses the process of mercerizing cotton fabrics. Mercerizing involves treating cotton yarns or fabrics with a cold or hot solution of sodium hydroxide (caustic soda) under tension to improve properties like strength, luster, and dye affinity. Specifically, swelling the cotton fibers in the caustic soda solution changes their cross-sectional shape and increases luster when the tension is maintained during washing. There are different methods for mercerizing yarns, knits, and woven fabrics either as batches or continuously. The advantages of mercerizing include brighter dye colors, better color retention after washing, and increased strength, smoothness, and resistance to damage.
This document provides an overview of drawing and texturizing processes in the textile industry. It begins with an introduction to filament production from man-made materials and defines drawing as a process used to orient polymer molecules and increase filament strength. Texturizing is defined as introducing crimps, loops or coils to filaments to create bulk. Common texturizing methods like false twist, draw texturizing and air jet texturizing are described. The document concludes with links to related textile technology Facebook pages.
fiber strength and fiber fineness are described in detail about the machinery and discussed about new computerized testing machines which are used to determine the strength and fineness of the fiber.
This document provides information on extra warp and weft figured fabrics. It discusses two methods of producing these fabrics: 1) using extra warp threads and 2) using extra weft threads. For extra warp fabrics, a separate warp beam is needed along with a dobby mechanism. For extra weft, a drop box mechanism is required. Both methods allow figuring in single or multiple colors. The document provides examples of motif designs and how the ground and extra threads interlace to produce the final figured fabric pattern.
Open-end spinning or rotor spinning is a technology for creating yarn without using a spindle. It separates fiber slivers into single fibers using an air stream and deposits them onto a collecting surface where they are twisted into yarn as it is drawn off. The principle is similar to a clothes dryer where individual sheets can be pulled out while twisting together. Fibers are fed onto the collecting surface which is continuously moving, aligning the fibers and twisting them into a thread that is wound onto a bobbin. Open-end spinning allows internal fiber stresses to relax and imparts twist directly onto the yarn end rather than drafting fibers. This makes the process faster and less labor intensive than ring spinning.
Chemicals and Auxiliaries used in Textile Wet ProcessingMashrur Wasity
This document discusses various chemicals and auxiliaries used in textile wet processing. It defines auxiliaries as chemicals that help processing operations like preparation, dyeing and printing work more efficiently. Some common auxiliaries mentioned include surfactants, wetting agents, sequestering agents, dispersing agents and emulsifiers. Basic chemicals used in wet processing like acids, bases, salts, oxidizing and reducing agents are also discussed. The roles and examples of various chemicals are provided in concise points.
Study of relationship between seam slippage& strengthAbdur Rahim Khan
1. The document outlines a research project on analyzing factors that influence seam slippage in woven garments.
2. The project will examine the effect of fabric properties like GSM, cover factor, and thickness on seam slippage strength. Fabric samples with different values for these properties will be stitched and tested.
3. Mathematical relationships and graphs will be used to determine the dependency and correlation between seam slippage strength and the structural parameters of the woven fabrics. Test results and data analysis will be included in the project report.
Lappet weaving and swivel weaving are types of weaving that produce decorative patterns. Lappet weaving introduces extra warp threads into a plain weave base to create figures, while swivel weaving introduces extra weft threads into the base fabric to produce spot effects. Both weaving styles can produce attractive designs but lappet weaving is more durable, and swivel weaving may cause roughness on the back side of the fabric. Common fabrics produced include madras, grenadine and dotted swiss. The key difference between the two is that in swivel weaving, the extra weft threads are cut off at the end of each design while in lappet weaving the design thread is
The document provides an overview of looms and loom mechanisms. It discusses the basic components and functions of a loom, including the heald shaft, sley or lay, shuttle, shuttle box, picker, and reed. It describes how these components work together to form fabric by interlacing the warp and weft threads. The passage of materials through a typical loom is also illustrated in a diagram.
A basic introduction of Fabric manufacturing technology. Weaving is a very important manufacturing technology. Here is a basic knowledge of Weave fabric manufacturing.
This document discusses the operational principles of loom motions. It begins by defining a loom and classifying the main types. It then describes the important parts of a loom, including the heald shaft and shuttle. The document explains the weaving process and the primary loom motions of shedding, picking, and beating up. It also discusses the secondary motions of take up and let off, and the auxiliary motions including warp stop, weft stop, and warp protector.
The document summarizes key aspects of textile engineering related to weaving. It discusses the three main types of fabrics - woven, knitted, and nonwoven - and describes the weaving process steps from winding the yarn to sizing and weaving. It also compares woven and knitted fabrics, explains why yarn preparation is necessary before weaving, outlines different types of looms including hand, power, automatic and shuttle-less looms, and describes the weaving processes of shedding, picking, and beat-up. The document was presented by Mazharul Islam from the Department of Wet Process Engineering at PTEC.
This document summarizes a student's summer training project on reducing warp breaks at a weaving department. It includes an introduction, acknowledgements, objectives, and sections on literature review, materials and methods, cost benefit analysis, inferences, and conclusions. The student conducted the project under the guidance of Mr. A.K.S. Gangwar to analyze causes of warp breakage and reduce warp breaks per machine at a textile company.
This document provides an overview of the textile industry from fiber to fabric production. It begins with an introduction to textiles and describes the various natural and man-made fibers used. It then explains the different types of yarns and methods for fabric formation, including weaving, braiding, knitting, and nonwovens. The document focuses on weaving processes like warping, sizing, shedding, and types of looms. It also discusses other fabric formation methods like tufting and provides classifications of shuttle and shuttleless looms. The document aims to provide basic information on the textile industry for intermediate employees and consumers.
This document provides information about various machines used in the spinning section of textile engineering. It includes flow charts that outline the processes and machines used to produce carded, combed, and rotor yarns. Key machines discussed include blow room, carding, draw frame, and ring frame. It also covers bale management, mixing, blending, ginning, and the functions of blow room and carding machines.
The document discusses the process of cotton yarn spinning from start to finish. It begins with the cotton fiber growing in bolls on the cotton plant. The fibers then undergo various cleaning and preparation processes. The main steps of yarn spinning involve blowroom preparation, carding, drawing, combing (optional), roving, ring spinning, and cone winding. Each step performs important functions like opening, cleaning, drafting, twisting, and winding the fibers into yarns of increasing fineness and uniformity ready for further textile manufacturing. Ring spinning is described as the most common method and produces strong, fine yarns suitable for many applications.
Fabric Manufacturing Engineering, All Experiment Submission.pdfT. M. Ashikur Rahman
The tappet shedding mechanism uses tappets attached to a bottom shaft to raise and lower heald shafts, forming a shed for the shuttle to pass through. There are two main types - negative tappet shedding, where the tappet controls only one movement of the heald shaft and an external device returns it, and positive tappet shedding where the tappet controls both upward and downward movement. The tappet rotates and strikes a bowl connected to a treadle lever, moving the heald shaft up or down depending on the type of tappet shedding. Tappet shedding can produce basic weaves but is limited in complexity compared to other shedding mechanisms.
The document summarizes the key steps in yarn production from blow room to post-spinning processes. In the blow room, opening, cleaning, and blending operations prepare fiber tufts for carding. Carding further individualizes and aligns fibers to form slivers. Draw frames improve material evenness and parallelize fibers. Combing removes short fibers and impurities. Roving frames draft and twist slivers to form rovings. Ring and rotor spinning systems draft, twist, and wind rovings into yarns. Post-spinning processes include winding yarns onto larger packages and plying to improve smoothness. The document outlines objectives and components of each major process step in yarn manufacturing
It is a fully informative presentation slide about Modern Loom. Here we discussed about Modern Loom, Types & details of every types with figure and video.
The document discusses different types of knitting faults that occur in knit fabrics, their causes, and potential remedies. It analyzes data from quality inspection sheets of various knit fabric samples and examines how changing stitch length affects common faults. The types of faults studied include holes/cracks, loops/dropped stitches, Lycra out, knots, and others. Data is presented on the percentage of different faults found in single jersey fabric samples before and after implementing remedies to reduce faults. Implementing remedies such as ensuring uniform yarn tension, regulating yarn feed rate, and adjusting machine settings helped minimize common faults like holes, barre, streaks, and others.
The document discusses different types of knitting faults that occur in knit fabrics, their causes, and potential remedies. It analyzes data from quality inspection sheets of various knit fabric samples and examines how changing stitch length affects common faults. The types of faults studied include holes/cracks, loops/dropped stitches, Lycra out, knots, barre, streaks, snarls, contaminations, spirality, needle lines, sinker lines, oil lines, surface hairiness, pilling, and bowing. Statistical analysis of single jersey fabric samples shows the percentage of each fault can be reduced from the existing process to a developing process by implementing remedies such as ensuring uniform yarn tension, feed rate, and fabric
The document provides information on various processes involved in yarn production including carded yarn production, combed yarn production, rotor yarn production, and jute yarn manufacturing. It includes flow charts showing the input, process, machine, and output for each type of yarn production. It also describes processes like bale management, mixing, blending, ginning, blowroom, carding, draw frame, and jute processing steps.
Fibers are converted into yarns through several processes to prepare them for fabric construction. Fibers are first opened, blended, and cleaned. They then undergo either carding or combing to further clean and align the fibers into slivers. The slivers are drawn and spun into yarns, which can be done through ring spinning, rotor spinning, or air jet spinning. Ring spinning produces the highest quality yarns while rotor and air jet spinning have higher production rates. The yarns are then wound onto packages or cones and are ready to be used to create fabrics through weaving or knitting.
This document provides information about Tua-Ha Textile Ltd., a knitting, dyeing, finishing, and garment manufacturing factory in Bangladesh. It details the factory's objectives to meet client expectations, gain buyer confidence, be known for quality Bangladeshi products, create jobs, and use modern communication technologies. It also outlines the factory's compliance with regulations regarding labor, health, and safety. The document focuses on the factory's knitting section, describing the types of fabrics it produces, raw materials used, production processes, machinery, and potential faults in knitting.
The document describes Abdullah Al Mahfuj's profile and a presentation on a rapier loom. It defines a rapier loom as using a rapier device to insert the weft yarn across the loom. There are two main types - single and double rapier looms. The presentation discusses the features, advantages and disadvantages of rapier looms, noting they can produce fancy fabrics but at a higher cost than other looms.
The document discusses combing preparatory processes. It describes the need for combing preparatory, which includes fiber straightening, reversing fiber flow, and producing a flat sliver. Traditionally, this involved a sliver lap machine and ribbon lap machine, but now mostly uses a draw frame and sliver lap machine. The objectives of combing preparatory are to straighten fibers, reverse flow, maximize leading fiber hooks, and produce a flat sliver. Different machine types and their functions are explained, including parameters that influence the combing operation and quality of the finished product.
This document discusses advanced weaving technology, including different types of looms. It compares shuttle looms with shuttleless modern looms. Shuttle looms are cheaper but have disadvantages like requiring pirn winding, uncontrolled shuttle speed, and limited width. Modern looms have higher costs but allow for higher speeds, wider fabrics, and better quality control. Key components of modern looms discussed include weft accumulators, which help regulate weft tension, and different types of selvedges along the fabric edges.
The document discusses the carding process which involves opening, cleaning and assembling fibers into a sliver through different sections of a carding machine like feed, licker-in, cylinder and doffer. It explains the objectives, necessities and zones of carding along with details of components like types of clothing, their functioning and settings that are important for quality carding. The document also covers developments in carding technology and types of drives used in modern carding machines.
The document discusses weaving technology and processes. It describes how weaving involves interlacing two sets of threads, the warp and weft. It then summarizes the key steps in preparing yarn for weaving: warping to transfer yarn to a beam, sizing to reduce hairiness and increase strength, and drawing-in yarns into the loom. The basic mechanisms of warp and weft control in weaving are also outlined.
Industrial attachment of South East Textiles (Pvt.) Ltd.Amanuzzaman Aman
This document summarizes the machinery used at South East Textiles Pvt Ltd, a textile company in Bangladesh. The knitting section uses various knitting machines like single jersey, rib machines, interlock machines and fleece machines. The dyeing section uses sample dyeing machines and bulk dyeing machines. The finishing section has machines for calendaring, printing and embroidery. The document provides specifications for the various knitting, dyeing and finishing machines.
Internship report of Turag Garments & Hosiery Mills Ltd.Amanuzzaman Aman
This document provides information about the author's 3-month internship at Turag Garments & Hosiery Mills Ltd. It includes an acknowledgement, executive summary, table of contents, and initial chapters covering the company's history and overview, organizational structure, machine descriptions, raw materials, and utility services. The author observed various production departments and aims to provide insights into Turag's high-quality garment manufacturing processes and its ability to fulfill special requirements from international buyers.
Project Report on Textile Industrial EngineeringAmanuzzaman Aman
Here are the key steps to prepare an assembly line:
1. Identify the major operations required to produce the garment. Break down the manufacturing process into individual steps.
2. Determine the sequence of operations based on material and component flow. Arrange the operations in logical order.
3. Estimate the standard time for each operation using time study data.
4. Calculate the cycle time for each operation based on production target.
5. Select appropriate machines required for each operation considering operation type and cycle time.
6. Arrange the machines along the assembly line in the sequence of operations to ensure smooth material flow.
7. Ensure adequate space and workstations between machines for operator movement and part handling.
This document discusses different types of pressing used in the garments industry. It begins by defining pressing as applying heat and pressure to remove creases from cloth or garments. There are five categories of pressing based on the garment type and material: no pressing, minimum pressing, under pressing, final pressing, and permanent pressing. The document then describes the objectives and types of different pressing equipment used, including irons, steam presses, steam air finishing machines, and steam tunnels.
This presentation summarizes the process of sizing for textiles. Sizing involves applying a coating to warp yarns to minimize breakage during weaving. The objectives of sizing are to increase smoothness, strength and elasticity while reducing hairiness. Common sizing ingredients include starch, softeners, binders and antiseptics. Different types of sizing are used depending on the fabric, from pure to heavy. Sizing techniques include hot melt, solvent and foam methods. Key parts of a sizing machine and common sizing faults are also outlined.
This presentation discusses effluent treatment plants (ETPs). It begins by defining an ETP as a process for treating industrial wastewater before safe disposal. It then lists the key objectives of ETPs as cleaning effluent for reuse, reducing freshwater usage, and meeting government standards to protect the environment. The document focuses on benefits of ETPs for textile industries, particularly ensuring compliance, recycling water, reducing waste, and removing pollutants. It outlines treatment levels including preliminary, primary, secondary and tertiary processes. The primary treatment involves settling and removal of large solids. Secondary treatment uses biological and chemical processes to remove more solids and organics. Tertiary treatment provides final filtration before discharge
This presentation summarizes the scouring process used in textile engineering. Scouring involves treating textiles with alkali to remove oils, fats, waxes and other impurities. It increases the absorbency of textiles. There are two main scouring methods - discontinuous scouring using a kier boiler, and continuous scouring using a J-box system. The kier boiler involves loading fabric into a cylindrical vessel and spraying it with hot alkaline liquor over several hours. The J-box method scours open-width fabric using rolls to impregnate it with alkali and heat it in the J-shaped box for 30 minutes. Both processes aim to saponify oils and emuls
This document describes different methods of desizing fabrics. Desizing is necessary to remove starch-based sizing agents applied to warp yarns before weaving. The key methods discussed are hydrolytic desizing using water and microorganisms, acid desizing using dilute acid solutions, and enzymatic desizing using enzymes like malt extract. Oxidative desizing using oxidizing agents like sodium bromite is also covered, which oxidizes and depolymerizes the starch sizing agents. The document provides details on the processes and chemicals involved in each desizing method.
This document provides details about a peach finishing machine made by Nan Tong Huayi Dyeing & Printing Machinery Co. Ltd. The machine has a width of 2000 mm, operates at speeds between 4-43m/min, and was produced in 2011. It contains 24 rollers, 4 brush rollers, 6 cutting rollers, and 5 blowers. The document shares these technical specifications to inform about the peach finishing machine.
The document discusses bleaching, which involves decolorizing fabrics using oxidizing agents to break down color-producing compounds. It describes the mechanisms of bleaching using oxidative agents like hypochlorite and hydrogen peroxide. Key factors that affect bleaching like pH, time, temperature, and metal ions are outlined. Typical bleaching procedures and recipes for cotton, viscose, and other fibers are provided. Advantages of chlorine dioxide bleaching include complete removal of impurities and a high whiteness, while disadvantages include pollution from ClO2 and the need for acidic conditions.
Singeing is a process that removes loose fibers from fabric or yarn surfaces through heating or burning. There are three main types: plate, roller, and gas singeing. Plate singeing uses heated plates, roller singeing uses a hollow, heated cylinder, and gas singeing uses open flames. Singeing makes materials smoother, increases luster, and improves dyeing and printing quality. Precautions must be taken to avoid damage like uneven singeing, loss of strength, or thermal damage to heat-sensitive materials.
Desizing is the process of removing size material from warp yarns in woven fabrics to facilitate weaving. Size is applied before weaving to prevent breakage on the loom but must be removed before dyeing and finishing. There are two main methods of desizing - hydrolytic and oxidative. Hydrolytic methods like enzymatic desizing use enzymes like amylase to hydrolyze and reduce the molecular weight of starch size. Oxidative desizing uses oxidizing agents like bromides but risks damaging the cellulose fibers. Complete removal of size is important for effective dyeing and is tested by checking for color change or measuring weight loss in the fabric.
This document discusses textile finishing processes. It begins with an overview of finishing and definitions of dyeing and printing. It then provides flow charts of finishing processes for open and tube fabrics. The document outlines various dyeing and printing methods and types of finishing treatments including mechanical, chemical, and standard finishes. It concludes by stating that finishing processes can make fabrics more receptive to dyes, remove wrinkles, alter texture, and add qualities like stain resistance.
This document discusses dyeing and the dyeing process. It begins by defining dyeing as the process of adding color to textile materials like fibers, yarns, and fabrics using dyes and chemicals. It then describes the two primary types of dyes as natural dyes derived from plants and minerals, and synthetic dyes made in laboratories from sources like coal tar. The document outlines several dyeing methods including mass coloration, fiber dyeing, yarn dyeing, fabric dyeing, and continuous and garment dyeing. It also explains the three steps of the dyeing process as preparation, dyeing, and finishing.
The document discusses the singeing process, which is used to remove protruding fibers from fabric surfaces to give them a smooth appearance. Singeing involves passing fabric over an open flame or heated plates, which burns off the loose fibers. This improves the surface and reduces pilling. There are three main types of singeing machines - gas, plate, and rotary cylinder machines. Gas singeing is most common as it allows for uniform and controlled singeing. The key parameters for gas singeing include flame intensity, fabric speed, and distance from the flame. Singeing must be carefully monitored to ensure an even and complete result without damaging the fabric.
Mercerizing is a finishing treatment for cotton fibers that improves luster, strength, and dye affinity. It involves treating cotton with a strong alkaline solution like caustic soda, which causes the fibers to swell and shrink longitudinally, modifying their structure. This results in a shinier, stronger surface that is more resistant to wear and washing. The process increases the number of hydroxyl groups in the fibers, allowing for better dye uptake. Mercerizing can be done under tension to prevent shrinkage and maximize luster, or without tension.
Mercerization is a process that increases the luster of cellulosic fibers like cotton. There are two types: tension mercerization increases luster the most by swelling and rounding the fiber's cross-section as it is stretched in a caustic solution. Slack mercerization improves elasticity for fabrics that need to conform to the body. The goals of mercerization are to increase luster, strength, stability, dye uptake, and elasticity. It involves impregnating relaxed fibers in caustic soda, stretching them while soaked, and washing while maintained in a stretched state to cause chemical and physical changes that modify the fiber structure and properties.
Mercerizing is a finishing process for cotton that improves properties like luster and strength. It involves treating cotton with a strong alkaline solution, usually sodium hydroxide. John Mercer discovered the process in 1844. The sodium hydroxide penetrates the cotton fibers and reacts with hydroxyl groups, swelling the fibers longitudinally and altering the cellulose structure. This gives mercerized cotton increased luster, strength, dye uptake, and other improved qualities. The degree of mercerization depends on processing conditions like tension, concentration and time in the alkaline solution.
This document provides an overview of the dyeing process used in the textile industry. It defines dye as a complex compound that is applied to textile materials to represent color. The dyeing process involves changing textiles physically or chemically to produce a uniform color. The objectives of dyeing are to color textiles uniformly, increase attractiveness, and make fabrics suitable for various uses and decorative purposes. Dyes are classified by their physical form, application method, and chemical composition. Some common dyes mentioned are acid dyes, vat dyes, basic dyes, direct dyes, and reactive dyes. The dyeing process involves several steps like desizing, scouring, bleaching, and includes the use of
The document discusses the batch section process in dyeing fabrics. The batch section prepares fabrics to be dyed by grouping them into batches based on criteria like dyeing machine capacity, minimizing preparation time, and keeping batches for the same shade together. The batching manager plans initial batches considering these criteria. The batch section receives this plan and may adjust it based on machine conditions or emergencies. The key steps of batching include receiving fabric cards, prioritizing fabrics, checking availability, weighing and bundling fabrics, and documenting weights on cards before sending fabrics for dyeing.
Presentation of IEEE Slovenia CIS (Computational Intelligence Society) Chapte...University of Maribor
Slides from talk presenting:
Aleš Zamuda: Presentation of IEEE Slovenia CIS (Computational Intelligence Society) Chapter and Networking.
Presentation at IcETRAN 2024 session:
"Inter-Society Networking Panel GRSS/MTT-S/CIS
Panel Session: Promoting Connection and Cooperation"
IEEE Slovenia GRSS
IEEE Serbia and Montenegro MTT-S
IEEE Slovenia CIS
11TH INTERNATIONAL CONFERENCE ON ELECTRICAL, ELECTRONIC AND COMPUTING ENGINEERING
3-6 June 2024, Niš, Serbia
Electric vehicle and photovoltaic advanced roles in enhancing the financial p...IJECEIAES
Climate change's impact on the planet forced the United Nations and governments to promote green energies and electric transportation. The deployments of photovoltaic (PV) and electric vehicle (EV) systems gained stronger momentum due to their numerous advantages over fossil fuel types. The advantages go beyond sustainability to reach financial support and stability. The work in this paper introduces the hybrid system between PV and EV to support industrial and commercial plants. This paper covers the theoretical framework of the proposed hybrid system including the required equation to complete the cost analysis when PV and EV are present. In addition, the proposed design diagram which sets the priorities and requirements of the system is presented. The proposed approach allows setup to advance their power stability, especially during power outages. The presented information supports researchers and plant owners to complete the necessary analysis while promoting the deployment of clean energy. The result of a case study that represents a dairy milk farmer supports the theoretical works and highlights its advanced benefits to existing plants. The short return on investment of the proposed approach supports the paper's novelty approach for the sustainable electrical system. In addition, the proposed system allows for an isolated power setup without the need for a transmission line which enhances the safety of the electrical network
Embedded machine learning-based road conditions and driving behavior monitoringIJECEIAES
Car accident rates have increased in recent years, resulting in losses in human lives, properties, and other financial costs. An embedded machine learning-based system is developed to address this critical issue. The system can monitor road conditions, detect driving patterns, and identify aggressive driving behaviors. The system is based on neural networks trained on a comprehensive dataset of driving events, driving styles, and road conditions. The system effectively detects potential risks and helps mitigate the frequency and impact of accidents. The primary goal is to ensure the safety of drivers and vehicles. Collecting data involved gathering information on three key road events: normal street and normal drive, speed bumps, circular yellow speed bumps, and three aggressive driving actions: sudden start, sudden stop, and sudden entry. The gathered data is processed and analyzed using a machine learning system designed for limited power and memory devices. The developed system resulted in 91.9% accuracy, 93.6% precision, and 92% recall. The achieved inference time on an Arduino Nano 33 BLE Sense with a 32-bit CPU running at 64 MHz is 34 ms and requires 2.6 kB peak RAM and 139.9 kB program flash memory, making it suitable for resource-constrained embedded systems.
Introduction- e - waste – definition - sources of e-waste– hazardous substances in e-waste - effects of e-waste on environment and human health- need for e-waste management– e-waste handling rules - waste minimization techniques for managing e-waste – recycling of e-waste - disposal treatment methods of e- waste – mechanism of extraction of precious metal from leaching solution-global Scenario of E-waste – E-waste in India- case studies.
International Conference on NLP, Artificial Intelligence, Machine Learning an...gerogepatton
International Conference on NLP, Artificial Intelligence, Machine Learning and Applications (NLAIM 2024) offers a premier global platform for exchanging insights and findings in the theory, methodology, and applications of NLP, Artificial Intelligence, Machine Learning, and their applications. The conference seeks substantial contributions across all key domains of NLP, Artificial Intelligence, Machine Learning, and their practical applications, aiming to foster both theoretical advancements and real-world implementations. With a focus on facilitating collaboration between researchers and practitioners from academia and industry, the conference serves as a nexus for sharing the latest developments in the field.
We have compiled the most important slides from each speaker's presentation. This year’s compilation, available for free, captures the key insights and contributions shared during the DfMAy 2024 conference.
A SYSTEMATIC RISK ASSESSMENT APPROACH FOR SECURING THE SMART IRRIGATION SYSTEMSIJNSA Journal
The smart irrigation system represents an innovative approach to optimize water usage in agricultural and landscaping practices. The integration of cutting-edge technologies, including sensors, actuators, and data analysis, empowers this system to provide accurate monitoring and control of irrigation processes by leveraging real-time environmental conditions. The main objective of a smart irrigation system is to optimize water efficiency, minimize expenses, and foster the adoption of sustainable water management methods. This paper conducts a systematic risk assessment by exploring the key components/assets and their functionalities in the smart irrigation system. The crucial role of sensors in gathering data on soil moisture, weather patterns, and plant well-being is emphasized in this system. These sensors enable intelligent decision-making in irrigation scheduling and water distribution, leading to enhanced water efficiency and sustainable water management practices. Actuators enable automated control of irrigation devices, ensuring precise and targeted water delivery to plants. Additionally, the paper addresses the potential threat and vulnerabilities associated with smart irrigation systems. It discusses limitations of the system, such as power constraints and computational capabilities, and calculates the potential security risks. The paper suggests possible risk treatment methods for effective secure system operation. In conclusion, the paper emphasizes the significant benefits of implementing smart irrigation systems, including improved water conservation, increased crop yield, and reduced environmental impact. Additionally, based on the security analysis conducted, the paper recommends the implementation of countermeasures and security approaches to address vulnerabilities and ensure the integrity and reliability of the system. By incorporating these measures, smart irrigation technology can revolutionize water management practices in agriculture, promoting sustainability, resource efficiency, and safeguarding against potential security threats.
Literature Review Basics and Understanding Reference Management.pptxDr Ramhari Poudyal
Three-day training on academic research focuses on analytical tools at United Technical College, supported by the University Grant Commission, Nepal. 24-26 May 2024
Low power architecture of logic gates using adiabatic techniquesnooriasukmaningtyas
The growing significance of portable systems to limit power consumption in ultra-large-scale-integration chips of very high density, has recently led to rapid and inventive progresses in low-power design. The most effective technique is adiabatic logic circuit design in energy-efficient hardware. This paper presents two adiabatic approaches for the design of low power circuits, modified positive feedback adiabatic logic (modified PFAL) and the other is direct current diode based positive feedback adiabatic logic (DC-DB PFAL). Logic gates are the preliminary components in any digital circuit design. By improving the performance of basic gates, one can improvise the whole system performance. In this paper proposed circuit design of the low power architecture of OR/NOR, AND/NAND, and XOR/XNOR gates are presented using the said approaches and their results are analyzed for powerdissipation, delay, power-delay-product and rise time and compared with the other adiabatic techniques along with the conventional complementary metal oxide semiconductor (CMOS) designs reported in the literature. It has been found that the designs with DC-DB PFAL technique outperform with the percentage improvement of 65% for NOR gate and 7% for NAND gate and 34% for XNOR gate over the modified PFAL techniques at 10 MHz respectively.
Harnessing WebAssembly for Real-time Stateless Streaming PipelinesChristina Lin
Traditionally, dealing with real-time data pipelines has involved significant overhead, even for straightforward tasks like data transformation or masking. However, in this talk, we’ll venture into the dynamic realm of WebAssembly (WASM) and discover how it can revolutionize the creation of stateless streaming pipelines within a Kafka (Redpanda) broker. These pipelines are adept at managing low-latency, high-data-volume scenarios.
Harnessing WebAssembly for Real-time Stateless Streaming Pipelines
Introduction of weaving
1. 2
Introduction of Weaving Technology
1.1 Introduction
Objective of the Course
The objective of the course is to introduce the basic concepts of woven fabric manufacturing to the
sophomores of Textile Engineering/ Technology. The course material has been designed to create
interest among students and hone their analytical ability.
After attending this course, the students will be able to understand and analyze the preparatory
processes of weaving like winding, warping and sizing. They will also be able to analyze various
mechanisms of shuttle looms like shedding, picking, beat-up, take-up and let-off.
More emphasis has been given on the fundamental aspects so that the students get the opportunity
to think and learn rather than memorize and learn. All the equations have been derived so that
students can understand the contexts better and this has been supplemented with some numerical
problems at the end of each module. Some mundane descriptive part which requires memorizing
has been deliberately avoided. This pithy course material is not a substitute of standard text books.
Students are suggested to read text books for the details.
Text Books for Further Reading
Textile Sizing by B. C. Goswami, R. Anandjiwala and D. M. Hall , Marcel Dekker (2004).
Textile Mathematics : Volume III by J. E. Booth , The Textile Institute, Manchester.
Weaving mechanism by R. Marks and A. T. C. Robinson , The Textile Institute, Manchester (1976).
Weaving: Conversion of Yarn to Fabric by P. R. Lord and M. H. Mohamed , Woodhead Publishing
(1999).
Woven Textiles by K. L. Gandhi, Woodhead Publishing (2012)
Collaborator: Dr. Anindya Ghosh, Associate Professor, Government College of Engineering and
Textile Technology, Berhampore, West Bengal, India ( anindya.textile@gmail.com )
Acknowledgement: The author extends gratitude to The Textile Institute, Manchester, Sekisui
Specialty Chemicals America LLC, Uster Technologis AG, Prashant Group, Ahmedabad, for granting
permission to use some figures from their books and technical literature.
Fabric Manufacturing Technologies
Textile fabrics are generally two dimensional flexible materials made by interlacing of yarns or
inter-meshing of loops with the exception of nonwovens and braids. Fabric manufacturing is one of
the four major stages (fibre production, yarn manufacturing, fabric manufacturing, and textile
chemical processing) of textile value chain. Most of the apparel fabrics are manufactured by
weaving technology though knitting is catching up fast specially in the sportswear segment. Natural
fibres in general and cotton fibre in particular are the most popular raw material for woven fabrics
intended for apparel use. Staple fibres are converted into spun yarns by the use of a series of
1 | P a g e
2. 2
Introduction of Weaving Technology
machines in the yarn manufacturing section. Continuous filament yarns are texturised to impart
spun yarn like bulk and appearance to them.
Textile fabrics are special materials as they are generally light-weight, flexible (easy to bend, shear
and twist), moldable, permeable and strong. There are four major technologies of fabric
manufacturing as listed below.
Woven Knitted Nonwoven Braided
Figure 1.1 depicts the fabrics produced by the four major technologies.
Fabric manufacturing may be preceded either by fibre production (in case of nonwoven) or by yarn
manufacturing (in case of weaving, knitting and braiding). Fabrics intended for apparel use must
fulfill multidimensional quality requirements in terms of drape, handle, crease recovery, tear
strength, air permeability, thermal resistance, moisture vapour permeability. However, looking at
the unique properties and versatility of textile fabrics, they are now being used in various technical
applications where the requirements are altogether different. Some examples are given in Table
1.1.
Table 1.1: Properties of some technical fabrics
Fabric type Important properties/ parameters
Filter fabric Pore size, pore size distribution
Body armour fabrics Impact resistance, areal density, bending
resistance
Fabrics as performs for
composite
Tensile strength and tensile modulus
Knitted compression bandages Stretchability, tensile modulus, creep
2 | P a g e
3. 2
Introduction of Weaving Technology
Weaving Technology
Weaving is the most popular way of fabric manufacturing. It is primarily done by interlacing two
orthogonal sets (warp and weft) of yarns in a regular and recurring pattern. Actual weaving
process is preceded by yarn preparation processes namely winding, warping, sizing, drawing and
denting.
Winding converts the smaller ringframe packages to bigger cheeses and cones while removing
objectinable yarn faults. Pirn winding is performed to supply the weft yarns in shuttle looms. Figure
1.2 shows various yarn packages used in textile operations (from left to right: ringframe bobbin or
cop, cone, cheese and pirn). Warping is done with the objective to prepare a warper’s beam which
contains a large number of parallel ends in a double flanged beam. Sizing is the process of applying
a protective coating on the warp yarns so that they can withstand repeated stresses, strains and
flexing during the weaving process. Finally the fabric is manufactured on looms which perform
several operations at proper sequence so that there is interlacement between warp and weft yarns
and continuous fabric production.
Figure 1.2: Types of yarn packages
Types of Looms
Hand Loom: This is mainly used in unorganized sector. Operations like shedding and picking is
done by using manual power.This is one of the major sources of employment generation in rural
areas.
Power Loom: It was designed by Edmund Cartwright in 1780s (during the industrial revolution).
All the operations of the loom are automatic except the change of the pirn.
Automatic Loom: In this power loom, the exhausted pirn is replenished by the full one without
stoppages. Under-pick system is a requirement for these looms.
Multiphase Loom: Multiple sheds can be formed simultaneously in this looms and thus productivity
can be increased by a great extent. It has failed to gain commercial success.
3 | P a g e
4. 2
Introduction of Weaving Technology
Shuttle-less Loom: Weft is carried projectiles, rapiers or fluids in case of shuttle-less looms. The rate
of production is much higher for these looms. Besides, the quality of the products is also better and
the product range much broader compared to that of Power looms. Most of the modern mills are
equipped with different types of shuttle-less looms based on the product range.
Circular Loom: Tubular fabrics like hose-pipes and sacks are manufactured by circular looms.
Narrow Loom: These looms are also known as needle looms and used to manufacture narrow width
fabrics like tapes, webbings, ribbons and zipper tapes.
Primary Motions
Figure 1.3 shows some basic components of a loom. For fabric manufacturing through weaving,
three primary motions are required namely shedding, picking and beat up.
Figure 1.3: Basic loom components
Shedding
It is the process by which the warp sheet is divided into two groups so that a clear passage is
created for the weft yarn or weft carrying device to pass through it. One group of yarns (red yarns)
either moves in the upward direction or stay in the up position (if they are already in up position)
as shown in Figure 1.4. Thus they form the top shed line. Another group of yarns (green yarns)
either moves in the downward direction or stay in the down position (if they are already in down
position). Thus they form the bottom shed line.
4 | P a g e
5. 2
Introduction of Weaving Technology
Figure 1.4: Shedding
Except for jacquard shedding, warp yarns are not controlled individually during the shedding
operation. Healds (Figure 1.5) are used to control a large number of warp yarns. The upward and
downward movements of healds are controlled either by cam or dobby shedding mechanisms. The
movement of the healds is not continuous. After reaching the top or bottom position, the healds, in
general, remain stationary for some duration. This is known as ‘dwell’. In general, the shed changes
after every pick i.e. the insertion of weft.
Figure 1.5: Heald
5 | P a g e
6. 2
Introduction of Weaving Technology
Picking
The insertion of weft or weft carrying device (shuttle, projectile or rapier) through the shed is
known as picking. Based on picking system, looms can be classified as follows.
Shuttle loom: weft package is carried by the wooden shuttle
Projectile loom: weft is carried by metallic or composite projectile
Airjet loom: weft is inserted by jet of compressed air
Waterjet loom: weft is inserted by water jet
Rapier loom: weft is inserted by flexible or rigid rapiers
Figure 1.6 shows some weft carrying devices.
Figure 1.6: Shuttle, rapier heads and projectile (from top to bottom)
With the exception of shuttle loom, weft is always inserted from only one side of the loom. The
timing of picking is extremely important specially in case of shuttle loom. The shuttle should enter
into the shed and leave the shed when the shed is sufficiently open (Figure 1.7). Otherwise, the
movement of the shuttle will be obstructed by the warp yarns. As a result, the warp yarns may
break due to abrasion or the shuttle may get trapped in the shed which may cause damage to reed,
shuttle and warp yarns.
6 | P a g e
7. 2
Introduction of Weaving Technology
Figure 1.7: Picking
Beat-up
Beat up is the action by which the newly inserted weft yarn is pushed up to the cloth fell (Figure
1.8). Cloth fell is the boundary up to which the fabric has been woven. The loom component
responsible for the beat up is called ‘reed’. The reed, which is like a metallic comb, is carried by sley
which sways forward and backwards due to the crank-connecting rod mechanism. This is known as
crank beat up. In modern looms, beat up is done by cam mechanism which is known as cam beat up.
Generally, one beat up is done after the insertion of one pick.
Figure 1.8: Beat up
Secondary Motions
For uninterrupted manufacturing of fabrics, two additional secondary motions are required. These
are take-up and let-off. Take-up motion winds the newly formed fabric on the cloth roller either
7 | P a g e
8. 2
Introduction of Weaving Technology
continuously or intermittently after the beat up. The take-up speed also determines the picks/cm
value in the fabric at loom state. As the take-up motion winds the newly formed fabric, tension in
the warp sheet increases. To compensate this, the weavers beam is rotated by the let-off
mechanism so that some new warp sheet is released.
Auxiliary Motions
Auxiliary motions are mainly related to the activation of stop motions in case of any malfunctioning
like warp breakage, weft breakage or shuttle trapping within the shed. The major auxiliary motions
are as follows:
Warp stop motion (in case of warp breakage)
Weft stop motion (in case of weft breakage)
Warp protector motion (in case of shuttle trapping)
Some Basic Definitions Related to Woven Fabrics
Yarn count: Yarn count represents the coarseness or fineness of yarns. There are two distinct
principles to express the yarn count.
Direct systems (Example: Tex, Denier)
Indirect systems (Example: new English i.e. Ne, Metric i.e. Nm)
Direct system revolves around expressing the mass of yarn per unit length. In contrast, indirect
system expresses length of yarn per unit mass. For example, 10 tex yarn implies that the 1000 m
long yarn will have a mass of 10 g. Similarly, for 10 denier, 9000 m long yarn will have a mass of 10
g. Denier is popularly used to express the fineness of synthetic fibres and filaments. A 10 denier
yarn is finer than a 10 tex yarn as for the same mass, the length is nine times for the former.
On the other hand, 10 Ne implies that 1 pound yarn will have a length of 10 × 840 yards. As the Ne
value increases (say from 10 Ne to 20 Ne), the yarn becomes finer.
Table 1.1 shows the details of some popular yarn count systems.
Table 1.1: Direct and indirect systems of yarn count
TYPE
NAME UNIT OF MASS
UNIT OF LENGTH
Direct
Tex Gram
1000 m
Denier Gram
9000 m
Indirect
Ne Pound
Hank (840 yards)
Metric Kilogram
Kilometer
8 | P a g e
9. 2
Introduction of Weaving Technology
Conversion Factors
Packing factor or packing coefficient: It represents the extent of closeness of fibres within a yarn
structure. For the same yarn linear density, if the fibres are closely packed, then its diameter will be
less. This happens when a spun yarn is manufactured with high level of twist. Figure 1.9 shows the
close packing of circular fibres in a yarn.
Figure 1.9: Close packing of circular fibres
Packing factor is expressed as follows:
For spun yarns, the value of packing factor generally lies between 0.55 and 0.65. Yarns with lower
packing factor are expected to be more bulky and softer. They can give higher fabric cover for same
fabric construction parameters.
Warp: The group of longitudinal yarns in a woven fabric is called warp. A single warp is called ‘end’.
Weft: The group of transverse yarns in a woven fabric is called weft. A single weft is called ‘pick’.
Crimp: It is the measure of the degree of waviness present in the yarns inside a woven fabric due to
interlacement. It is expressed as follows:
9 | P a g e
10. 2
Introduction of Weaving Technology
Contraction: It is expressed as follows:
If the warp crimp is 10%, then the straightened length of an end, unraveled from the one meter long
fabric, will be 1.1 m.
Fractional cover: It is the ratio of area covered by the yarns to the total area of the fabric. If warp
yarn diameter is ‘d1’ inch and spacing between two consecutive ends is ‘p1’ inch then fractional
cover for warp (k1) is
Now, for cotton yarns, having packing factor of 0.6, the relationship between yarn diameter (inch)
and yarn count (Ne) is as follows:
The relationship between end spacing (p1) and ends per inch (n1) is as follows:
After rearranging, we can write
Cover factor : It is obtained by multiplying fractional cover with 28.
Fabric cover is a very important parameter as it influences the following properties of the woven
fabrics.
Air permeability
Moisture vapour permeability
Ultra violet or any other types of radiation protection
10 | P a g e
11. 2
Introduction of Weaving Technology
Figure 1.10 shows two fabrics with low and high cover factors
Figure 1.10: Fabrics with low and high cover factors
Areal density: It is expressed by the mass of the fabric per unit area. In most of the cases the mass is
expressed in gram (g) and area is expressed in square meter (m2). Therefore, the unit becomes g/
m2 which is popularly called as GSM. Areal density of fabric will depend on the following
parameters.
Warp yarn count
Weft yarn count
Ends per unit length (EPI or EPcm)
Picks per unit length (PPI or PPcm)
Crimp% in warp
Crimp% in weft
11 | P a g e