This document discusses non-woven fabrics and their various end uses and production processes. It describes how non-wovens are used in personal care products, healthcare, clothing, home goods, automotive, construction, and industrial applications. It also summarizes the main mechanical and chemical finishing processes employed for non-wovens including splitting, calendering, singeing, and treatments with softeners, stiffeners, and UV stabilizers. Additionally, the document outlines common bonding techniques such as needle punching, thermal bonding, and chemical adhesives. Finally, it provides an overview of fibers used in non-wovens like cellulosic, synthetic, and regenerated fibers.
The document discusses the Advanced Fiber Information System (AFIS), which was developed to more accurately and precisely measure properties of raw textile materials like cotton. AFIS uses aeromechanical and electro-optical techniques to separate fibers and analyze them individually, providing distributions of properties rather than just average values. This gives more detailed information about factors like fiber length and imperfections. Specifically, AFIS can classify neps (entanglements) into fiber neps and seed coat neps, providing a more comprehensive quality assessment of ginning cotton and processed fibers.
Rapier weaving is a shuttleless weaving technique where rigid or flexible rapiers carry the weft yarn through the shed. There are single and double rapier systems, with double being more common. In double systems, one rapier (giver) brings the yarn to the center and transfers it to the other rapier (taker) to carry to the other side. Dewas and Gabler systems differ in how the transfer occurs. Rapier machines are versatile and efficient with minimal stress on the weft yarn, resulting in high quality fabrics and low yarn breakage. Factors like machine speed, yarn properties, and shed formation affect yarn stresses.
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.
Non woven presentation by Lucky vankwani & Asad JafriLucky Vankwani
Non-woven fabrics are fabrics that are not woven or knitted. They are made directly from fibers through processes like carding, air laying, wet laying, and spunlacing. There are two main steps to making non-woven fabrics - web formation to entangle the fibers into a random web, and bonding the fibers together through methods like needling, adhesives, heat bonding, or stitch bonding. Non-woven fabrics have many applications like hygiene products, household goods, technical filters, geotextiles, and carpet backing due to their low cost to produce.
This document discusses various aspects of knitting science, including how loop length controls fabric dimensions and properties. It establishes three basic laws governing knitted structure: that loop length is fundamental, loop shape determines dimensions, and the relationship between shape and length can be expressed in equations. Other topics covered include how warp let-off, fabric relaxation and shrinkage, knitted fabric geometry, tightness factor, and robbing back can all influence knitted fabrics. The document also discusses needle bounce, positive needle control, and the Cadratex unit for controlling fabric tube shape.
A roving frame produces rovings of cotton and synthetic fibers through a process of drafting, twisting, and winding. It attenuates sliver through multiple drafting zones to form rovings of the required count. A flyer inserts twist into the roving as it is wound onto bobbins. Modern roving frames can achieve higher production rates through increased flyer speeds up to 1400 rpm and delivery speeds up to 40 m/min. They also have improved drafting systems and flyer designs for better fiber control and a wider draft range.
A non-woven fabric is made directly from fibres without creating yarn first. It is produced by bonding or interlocking fibres using mechanical, chemical, thermal, or solvent bonding. Non-woven fabrics have a higher production rate than woven or knitted fabrics and are cheaper to manufacture. While they can be engineered for specific properties, non-wovens do not match the aesthetics of conventional fabrics. Current major uses of non-wovens include geotextiles, medical products, disposable goods, and filters.
The document discusses the Advanced Fiber Information System (AFIS), which was developed to more accurately and precisely measure properties of raw textile materials like cotton. AFIS uses aeromechanical and electro-optical techniques to separate fibers and analyze them individually, providing distributions of properties rather than just average values. This gives more detailed information about factors like fiber length and imperfections. Specifically, AFIS can classify neps (entanglements) into fiber neps and seed coat neps, providing a more comprehensive quality assessment of ginning cotton and processed fibers.
Rapier weaving is a shuttleless weaving technique where rigid or flexible rapiers carry the weft yarn through the shed. There are single and double rapier systems, with double being more common. In double systems, one rapier (giver) brings the yarn to the center and transfers it to the other rapier (taker) to carry to the other side. Dewas and Gabler systems differ in how the transfer occurs. Rapier machines are versatile and efficient with minimal stress on the weft yarn, resulting in high quality fabrics and low yarn breakage. Factors like machine speed, yarn properties, and shed formation affect yarn stresses.
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.
Non woven presentation by Lucky vankwani & Asad JafriLucky Vankwani
Non-woven fabrics are fabrics that are not woven or knitted. They are made directly from fibers through processes like carding, air laying, wet laying, and spunlacing. There are two main steps to making non-woven fabrics - web formation to entangle the fibers into a random web, and bonding the fibers together through methods like needling, adhesives, heat bonding, or stitch bonding. Non-woven fabrics have many applications like hygiene products, household goods, technical filters, geotextiles, and carpet backing due to their low cost to produce.
This document discusses various aspects of knitting science, including how loop length controls fabric dimensions and properties. It establishes three basic laws governing knitted structure: that loop length is fundamental, loop shape determines dimensions, and the relationship between shape and length can be expressed in equations. Other topics covered include how warp let-off, fabric relaxation and shrinkage, knitted fabric geometry, tightness factor, and robbing back can all influence knitted fabrics. The document also discusses needle bounce, positive needle control, and the Cadratex unit for controlling fabric tube shape.
A roving frame produces rovings of cotton and synthetic fibers through a process of drafting, twisting, and winding. It attenuates sliver through multiple drafting zones to form rovings of the required count. A flyer inserts twist into the roving as it is wound onto bobbins. Modern roving frames can achieve higher production rates through increased flyer speeds up to 1400 rpm and delivery speeds up to 40 m/min. They also have improved drafting systems and flyer designs for better fiber control and a wider draft range.
A non-woven fabric is made directly from fibres without creating yarn first. It is produced by bonding or interlocking fibres using mechanical, chemical, thermal, or solvent bonding. Non-woven fabrics have a higher production rate than woven or knitted fabrics and are cheaper to manufacture. While they can be engineered for specific properties, non-wovens do not match the aesthetics of conventional fabrics. Current major uses of non-wovens include geotextiles, medical products, disposable goods, and filters.
Stitch bonding is a hybrid textile manufacturing technique that combines elements of nonwoven, sewing, and knitting processes. It involves locking layers of cross-laid fibers or nonwoven fabrics into a warp knit structure using pointed needles that penetrate the layers and insert stitching yarn. There are several stitch bonding systems that differ in whether they use a separate stitching thread or form loops within the layers themselves. Common applications of stitch bonded fabrics include upholstery, mattress coverings, cleaning cloths, and industrial materials like filters or insulation.
The comber is a machine that prepares cotton fibers for spinning into yarn by removing short fibers and impurities. It improves the quality characteristics of yarns such as evenness, strength, and cleanliness. To achieve these quality improvements, the comber must eliminate short fibers, remaining impurities, and neps from the fiber material while forming an optimal sliver. Modern comber preparation systems use a draw frame followed by a sliver doubling machine like a UniLap to prepare uniform batts for feeding into rectilinear combers, which have stationary detaching rollers and swinging nippers to further clean and parallelize the fibers.
The document discusses different mechanical bonding processes used to make nonwoven fabrics, focusing on needle punching and hydroentanglement. It provides details on:
1) The needle punching process which uses barbed needles to mechanically interlock fibers. Key components of the needle loom and felting needles are described.
2) The hydroentanglement process which uses high pressure water jets to entangle fibers. Details are given on the precursor web formation, entanglement unit, water system, and dewatering/drying steps.
3) Common applications of needlepunched and hydroentangled nonwovens which include wipes, protective clothing, artificial leather, surgical fabrics, filtration media and automotive uses.
Pierce's model treats woven fabric as a repeating network of identical unit cells composed of interlacing yarns with circular cross-sections. It allows for calculation of geometric parameters like thread spacing and fabric thickness. Kemp's model modifies yarn cross-section to an elliptical racetrack shape to better model tightly woven fabrics. Hearle's lenticular model uses an energy approach. While these models provide simplified representations, real fabrics do not conform to idealized shapes and the relationship between geometry and mechanical properties is still not fully understood.
The document discusses the key processes that take place in the blowroom of a yarn production facility. These include opening bales of fiber, cleaning the fiber through pre-cleaning and fine cleaning, removing dust, blending different fiber types, and evenly feeding the prepared fiber to the carding process. The goal of blowroom processes is to prepare fibers for subsequent processing while minimizing fiber loss and maintaining fiber quality.
Non woven
Nonwoven fabrics are broadly defined as sheet or web structures made of fibers or filaments bonded or interlocked together by mechanical, thermal, chemical or solvent means. They are flat, porous sheets that are made directly from separate fibers or from molten plastic or plastic film. They are not made by weaving or knitting and do not require converting the fibers to yarn.
Heat setting is a heat treatment process that imparts shape retention, crease resistance, resilience and elasticity to fibers. It involves four phases: heating, penetration, transition and stretch, and cooling. Heat setting can be carried out at different stages - in grey condition, after scouring, or after dyeing. Different methods are used for heat setting including contact, steam, hydro, tenter frame, and selective infrared methods. Heat setting results in structural and chemical modifications of fibers that change properties like strength, stretchability, softness, dyeability and sometimes color.
- Testing is important in the textile industry to ensure high quality products. Fiber testing is carried out at various stages - fiber, yarn, fabric and garment.
- Proper sampling is required as textile testing is both time consuming and destructive. Samples should be representative of the overall lot. In cotton, sampling is done at the bulk, basic, and laboratory levels.
- Key fiber properties that are tested include length, strength, fineness, and maturity. Tests are conducted under standard atmospheric conditions. Test results need to be properly interpreted and applied to fiber selection and process control.
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.
Singeing is a process that burns off small fibers and fuzz from fabric surfaces to make them smoother. It helps prevent pilling, improves dyeing and appearance, and increases luster. There are three main types of singeing machines: plate, roller, and gas machines. Gas machines are most common and use burners to singe fabric as it passes through. Proper singeing requires controlling flame intensity, fabric speed, distance to flames, and other parameters to completely remove fibers without damaging the fabric. Issues like uneven singeing can result from moisture, flame or machine inconsistencies.
Picking Mechanism | Beat Up Mechanism | Over Picking Under Picking MechanismMd Rakibul Hassan
The document discusses weaving technology and describes different mechanisms involved. It focuses on picking and beat-up mechanisms. Picking inserts the weft thread through the warp shed and can be bidirectional or unidirectional. Beat-up drives the inserted weft to the fell of the cloth. There are different types of picking (over, under) and beat-up (single, double, cam) mechanisms that are suited to different fabric weights and loom styles. Faults like early/late picking and factors influencing beat-up force are also covered.
This presentation provides an overview of nonwoven materials, including their definition, properties, production processes, bonding methods, finishing treatments, and applications. Nonwovens are sheets of fibers or filaments that are formed into a web and bonded together without weaving or knitting. They are made through processes like drylaying, spunlaying, meltblowing, and wetlaying. Common bonding methods are chemical, thermal, and mechanical. Nonwovens are used widely in hygiene products, agriculture, filtration, medical products, and packaging due to their desirable properties such as absorbency, strength, and breathability.
Non-woven fabrics are made from staple fibers or filaments that are bonded together through mechanical, thermal, chemical, or solvent treatments rather than weaving or knitting. The document discusses the history and definitions of non-woven fabrics. It then summarizes the key stages of non-woven manufacturing including web formation through processes like carding, air laying, and wet laying. It also discusses bonding methods like thermal, chemical, and mechanical and provides examples. The applications and characteristics of non-woven fabrics are then outlined.
The compact spinning is a process where fiber strand drawn by drafting system is condensed before twisting it.Following methods are used by machine manufacturers to condense the fiber strand.
1. Aerodynamic condensing.
2. Mechanical condensing.
3. Magnetic condensing.
Compact spinning has a promising future because of the higher production and improved quality of compact yarns
Ring spinning machines are the most commonly used spinning machines in the world. They consist of a spindle that twists the yarn and a ring and traveler that maintain tension. The key operations are creeling, drafting, twisting, winding, and doffing. Drafting draws out the fiber through three rollers. As the traveler circles the ring at high speeds, it picks up fibers from the front roller and twists them onto the spindle. Ring spinning can produce fine to coarse yarns from 5-1000 tex with good strength suitable for many applications. However, it has limitations such as low production rates and frequent doffing requirements.
Spinning is the first steps of textile product processing. The process of making yarns from the textile fiber is called spinning. There are various types of spinning techniques for producing various types of yarn.
Textile manufacturing and fabric processing (fiber to fabric)damayantimeher
This presentation deals with basic of fiber to fabric manufacturing process i.e spinning weaving , dyeing and printing.Spinning portion cover both natural fiber spinning, details of weaving and wet chemical processing portion cover dyeing printing and finishing of fibre yarn and fabric
Stitch bonding is a hybrid textile manufacturing technique that combines elements of nonwoven, sewing, and knitting processes. It involves locking layers of cross-laid fibers or nonwoven fabrics into a warp knit structure using pointed needles that penetrate the layers and insert stitching yarn. There are several stitch bonding systems that differ in whether they use a separate stitching thread or form loops within the layers themselves. Common applications of stitch bonded fabrics include upholstery, mattress coverings, cleaning cloths, and industrial materials like filters or insulation.
The comber is a machine that prepares cotton fibers for spinning into yarn by removing short fibers and impurities. It improves the quality characteristics of yarns such as evenness, strength, and cleanliness. To achieve these quality improvements, the comber must eliminate short fibers, remaining impurities, and neps from the fiber material while forming an optimal sliver. Modern comber preparation systems use a draw frame followed by a sliver doubling machine like a UniLap to prepare uniform batts for feeding into rectilinear combers, which have stationary detaching rollers and swinging nippers to further clean and parallelize the fibers.
The document discusses different mechanical bonding processes used to make nonwoven fabrics, focusing on needle punching and hydroentanglement. It provides details on:
1) The needle punching process which uses barbed needles to mechanically interlock fibers. Key components of the needle loom and felting needles are described.
2) The hydroentanglement process which uses high pressure water jets to entangle fibers. Details are given on the precursor web formation, entanglement unit, water system, and dewatering/drying steps.
3) Common applications of needlepunched and hydroentangled nonwovens which include wipes, protective clothing, artificial leather, surgical fabrics, filtration media and automotive uses.
Pierce's model treats woven fabric as a repeating network of identical unit cells composed of interlacing yarns with circular cross-sections. It allows for calculation of geometric parameters like thread spacing and fabric thickness. Kemp's model modifies yarn cross-section to an elliptical racetrack shape to better model tightly woven fabrics. Hearle's lenticular model uses an energy approach. While these models provide simplified representations, real fabrics do not conform to idealized shapes and the relationship between geometry and mechanical properties is still not fully understood.
The document discusses the key processes that take place in the blowroom of a yarn production facility. These include opening bales of fiber, cleaning the fiber through pre-cleaning and fine cleaning, removing dust, blending different fiber types, and evenly feeding the prepared fiber to the carding process. The goal of blowroom processes is to prepare fibers for subsequent processing while minimizing fiber loss and maintaining fiber quality.
Non woven
Nonwoven fabrics are broadly defined as sheet or web structures made of fibers or filaments bonded or interlocked together by mechanical, thermal, chemical or solvent means. They are flat, porous sheets that are made directly from separate fibers or from molten plastic or plastic film. They are not made by weaving or knitting and do not require converting the fibers to yarn.
Heat setting is a heat treatment process that imparts shape retention, crease resistance, resilience and elasticity to fibers. It involves four phases: heating, penetration, transition and stretch, and cooling. Heat setting can be carried out at different stages - in grey condition, after scouring, or after dyeing. Different methods are used for heat setting including contact, steam, hydro, tenter frame, and selective infrared methods. Heat setting results in structural and chemical modifications of fibers that change properties like strength, stretchability, softness, dyeability and sometimes color.
- Testing is important in the textile industry to ensure high quality products. Fiber testing is carried out at various stages - fiber, yarn, fabric and garment.
- Proper sampling is required as textile testing is both time consuming and destructive. Samples should be representative of the overall lot. In cotton, sampling is done at the bulk, basic, and laboratory levels.
- Key fiber properties that are tested include length, strength, fineness, and maturity. Tests are conducted under standard atmospheric conditions. Test results need to be properly interpreted and applied to fiber selection and process control.
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.
Singeing is a process that burns off small fibers and fuzz from fabric surfaces to make them smoother. It helps prevent pilling, improves dyeing and appearance, and increases luster. There are three main types of singeing machines: plate, roller, and gas machines. Gas machines are most common and use burners to singe fabric as it passes through. Proper singeing requires controlling flame intensity, fabric speed, distance to flames, and other parameters to completely remove fibers without damaging the fabric. Issues like uneven singeing can result from moisture, flame or machine inconsistencies.
Picking Mechanism | Beat Up Mechanism | Over Picking Under Picking MechanismMd Rakibul Hassan
The document discusses weaving technology and describes different mechanisms involved. It focuses on picking and beat-up mechanisms. Picking inserts the weft thread through the warp shed and can be bidirectional or unidirectional. Beat-up drives the inserted weft to the fell of the cloth. There are different types of picking (over, under) and beat-up (single, double, cam) mechanisms that are suited to different fabric weights and loom styles. Faults like early/late picking and factors influencing beat-up force are also covered.
This presentation provides an overview of nonwoven materials, including their definition, properties, production processes, bonding methods, finishing treatments, and applications. Nonwovens are sheets of fibers or filaments that are formed into a web and bonded together without weaving or knitting. They are made through processes like drylaying, spunlaying, meltblowing, and wetlaying. Common bonding methods are chemical, thermal, and mechanical. Nonwovens are used widely in hygiene products, agriculture, filtration, medical products, and packaging due to their desirable properties such as absorbency, strength, and breathability.
Non-woven fabrics are made from staple fibers or filaments that are bonded together through mechanical, thermal, chemical, or solvent treatments rather than weaving or knitting. The document discusses the history and definitions of non-woven fabrics. It then summarizes the key stages of non-woven manufacturing including web formation through processes like carding, air laying, and wet laying. It also discusses bonding methods like thermal, chemical, and mechanical and provides examples. The applications and characteristics of non-woven fabrics are then outlined.
The compact spinning is a process where fiber strand drawn by drafting system is condensed before twisting it.Following methods are used by machine manufacturers to condense the fiber strand.
1. Aerodynamic condensing.
2. Mechanical condensing.
3. Magnetic condensing.
Compact spinning has a promising future because of the higher production and improved quality of compact yarns
Ring spinning machines are the most commonly used spinning machines in the world. They consist of a spindle that twists the yarn and a ring and traveler that maintain tension. The key operations are creeling, drafting, twisting, winding, and doffing. Drafting draws out the fiber through three rollers. As the traveler circles the ring at high speeds, it picks up fibers from the front roller and twists them onto the spindle. Ring spinning can produce fine to coarse yarns from 5-1000 tex with good strength suitable for many applications. However, it has limitations such as low production rates and frequent doffing requirements.
Spinning is the first steps of textile product processing. The process of making yarns from the textile fiber is called spinning. There are various types of spinning techniques for producing various types of yarn.
Textile manufacturing and fabric processing (fiber to fabric)damayantimeher
This presentation deals with basic of fiber to fabric manufacturing process i.e spinning weaving , dyeing and printing.Spinning portion cover both natural fiber spinning, details of weaving and wet chemical processing portion cover dyeing printing and finishing of fibre yarn and fabric
This document discusses man-made fibers, including their classification and production processes. It begins by listing reference books on textile fibers. It then defines textile fibers and their key properties. There are two main types of man-made fibers: regenerated fibers made from cellulose, such as viscose, and synthetic fibers produced through chemical reactions, like polyester and nylon. These fibers are made using processes like melt spinning, dry spinning, and wet spinning. The document discusses the advantages and disadvantages of man-made fibers compared to natural fibers, as well as various fiber properties and texturing methods.
This document provides information about nonwoven fabrics, including definitions, history, production processes, characteristics, uses, and the roles of industry associations. It defines nonwoven fabrics as sheet materials made from long fibers bonded together without weaving or knitting. The production of nonwovens began in the 19th century and expanded commercially in the mid-20th century. Key points covered include the main steps of nonwoven production, common fiber materials, properties such as absorbency and strength, and applications in areas like filtration, hygiene, medical, furniture, and automotive. Industry associations that support the development of nonwovens are also mentioned.
This document discusses the use of textiles in filtration applications. It begins with an introduction to filtration principles and processes. It then focuses on how various textile fibers and fabric constructions, such as woven, nonwoven and knitted, can be used as filter media. Specific applications where textiles are used for filtration are described, including vacuum cleaners, medical devices, power plants, water purification and more. The document discusses factors that influence filtration performance, such as fiber type, fabric properties and finishing treatments. It also provides examples of how textiles can be applied to purify air and water. In summary, the document outlines the role of textiles in filtration and provides details on textile materials and constructions suitable for various filtration
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.
Textile finishing refers to processes performed on fabrics after dyeing to improve properties like appearance, performance, and feel. There are two main types of finishing: chemical finishing which uses chemicals and water, and mechanical finishing which uses techniques like calendaring without chemicals. Finishing aims to enhance fabric qualities, increase durability, impart new properties like flame resistance, and adapt fabrics for specific end uses. Processes can be classified as temporary or durable, and include techniques like brushing, compacting, resin treatment, and more. Careful consideration of factors like fiber type is needed to develop effective chemical formulations for finishing.
This document summarizes techniques for dry laid nonwoven fabrics. It discusses fibre selection and preparation, including bale opening and blending. There are two main web formation methods: mechanical (using cards or garnets) and aerodynamic (air-laid). Webs can be layered longitudinally, crosswise, or perpendicularly. Bonds are formed through needle punching, stitch bonding, thermal bonding, chemical bonding (using latex), or hydroentanglement. Needle punching uses barbed needles to mechanically interlock fibers. Thermal bonding melts thermoplastic fibers like polypropylene to fuse the web.
This document discusses various technologies for producing innovative nonwoven materials, including nanofibers produced through electrospinning, bicomponent fibers, meltblown and spunlace processes, and nonwoven spacer fabrics. It also covers applications of nonwovens such as abrasives, insulation, phase change materials, stretchable fabrics, and flushable wipes that meet industry standards. The document contains images to illustrate the different production processes and material structures.
The document provides information about sizing, which is the process of applying a gelatinous film to warp yarns before weaving. It discusses what sizing is, its objectives like increasing strength and smoothness, the types of sizing, common sizing faults, techniques like hot melting and solvent sizing, sizing machines, and main parts of a sizing machine like the creel, sizing box, drying cylinders, and beam. Sizing prepares warp yarns for weaving by strengthening them and making them smoother and more weavable. The document outlines the key components and processes involved in sizing warp yarns.
The document provides an overview of non-woven processes. It defines non-wovens and discusses their classification based on fiber type and production process. The major production processes include carding, air laying, spunbonding, meltblowing, needlepunching, and hydroentangling. These processes involve fiber preparation, web formation, bonding, and finishing. Non-wovens find applications in products like diapers, wipes, filters, insulation, and geotextiles due to their engineered properties. In conclusion, the document discusses opportunities for further innovation and economic study in the non-woven industry.
This document discusses different bonding systems used in non-woven fabrics including mechanical (needle punching), chemical (adhesives), thermal (heat bonding), and mechanical/warp knitting (stitch bonding). It provides photos and definitions of non-woven fabrics and describes the manufacturing process which involves forming a web and then bonding fibers together. Key bonding methods covered are needle felting, adhesive bonding, heat bonding, and stitch bonding.
The document is a project report submitted by three students on the effects of yarn conditioning. It includes an introduction outlining the aims of studying how yarn properties are affected by conditioning. It then discusses what conditioning is, the advantages it provides, and the different processes used for various yarn types. The report examines the properties of a cotton yarn sample, including moisture regain and other qualities, before and after conditioning.
This presentation provides an overview of non-woven fabrics. It discusses the history and increasing production of non-wovens in Europe and the US. The main methods for producing non-woven fabrics are dry laying, wet laying, and spun melt. Key bonding methods are adhesive bonding, thermal bonding, and mechanical entanglement. Non-wovens are used in various industries like agriculture, construction, automotive, medical, and more. The manufacturing process involves fiber preparation, web formation, bonding, drying, and finishing. Cotton and polypropylene are common fibers used for non-woven production.
1. The document provides an overview of spandex or elastane fiber, including its history, production process, properties, and uses.
2. Spandex is a synthetic fiber known for its elasticity, made from a polymer of polyurethane. It was developed in the 1950s and revolutionized the clothing industry.
3. The production process involves mixing prepolymers like a flexible macro-glycol and stiff diisocyanate, then spinning and curing the polymer solution to form elastic fibers.
Flocking is defined as the application of fine particles to adhesive coated surfaces. Nowadays, this is usually done by the application of a high-voltage electric field. In a flocking machine the "flock" is given a negative charge whilst the substrate is earthed. Flock material flies vertically onto the substrate attaching to previously applied glue.
Spandex or elastane is a synthetic fiber known for its exceptional elasticity, stretching over 500% without breaking. It is a polyurethane-polyurea copolymer developed in 1959 by chemists at DuPont. Spandex is produced through a process of mixing a flexible macroglycol with a stiff diisocyanate prepolymer, then spinning the solution through a spinneret to form solid strands that are bundled into fibers. It is strong, lightweight, soft, and retains its shape after stretching. Common applications include athletic clothing, swimsuits, socks, and other elastic garments.
The document discusses the importance of thoroughly understanding sewing thread. It covers various factors that affect the aesthetics and performance of threads, such as color, luster, thickness, seam strength, and abrasion resistance. Additionally, it describes different types of threads based on their substrate, construction, and finish to achieve properties like high strength, smoothness, and durability. Proper thread selection and an understanding of thread parameters are essential for achieving good sewing performance and seam quality.
This document provides an overview of textile finishing processes. It defines textile finishing as treatments applied to fibers, yarns, or fabrics to impart desired functional properties. These finishes are broadly classified into mechanical, chemical, and enzyme finishes. The document then describes various mechanical processes like calendaring and chemical processes like flame retardant treatments. It also discusses enzyme finishing and some specific thread finishing techniques.
Two different systems are followed in wool processing, the woolen system, and the worsted system. In the woolen system, the fibers are carded and then spun It affects the processing efficiency as well as the quality of the product.This presentation has focused on wool spinning particularly woolen & worsted spinning process.
CHINA’S GEO-ECONOMIC OUTREACH IN CENTRAL ASIAN COUNTRIES AND FUTURE PROSPECTjpsjournal1
The rivalry between prominent international actors for dominance over Central Asia's hydrocarbon
reserves and the ancient silk trade route, along with China's diplomatic endeavours in the area, has been
referred to as the "New Great Game." This research centres on the power struggle, considering
geopolitical, geostrategic, and geoeconomic variables. Topics including trade, political hegemony, oil
politics, and conventional and nontraditional security are all explored and explained by the researcher.
Using Mackinder's Heartland, Spykman Rimland, and Hegemonic Stability theories, examines China's role
in Central Asia. This study adheres to the empirical epistemological method and has taken care of
objectivity. This study analyze primary and secondary research documents critically to elaborate role of
china’s geo economic outreach in central Asian countries and its future prospect. China is thriving in trade,
pipeline politics, and winning states, according to this study, thanks to important instruments like the
Shanghai Cooperation Organisation and the Belt and Road Economic Initiative. According to this study,
China is seeing significant success in commerce, pipeline politics, and gaining influence on other
governments. This success may be attributed to the effective utilisation of key tools such as the Shanghai
Cooperation Organisation and the Belt and Road Economic Initiative.
Using recycled concrete aggregates (RCA) for pavements is crucial to achieving sustainability. Implementing RCA for new pavement can minimize carbon footprint, conserve natural resources, reduce harmful emissions, and lower life cycle costs. Compared to natural aggregate (NA), RCA pavement has fewer comprehensive studies and sustainability assessments.
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.
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.
Batteries -Introduction – Types of Batteries – discharging and charging of battery - characteristics of battery –battery rating- various tests on battery- – Primary battery: silver button cell- Secondary battery :Ni-Cd battery-modern battery: lithium ion battery-maintenance of batteries-choices of batteries for electric vehicle applications.
Fuel Cells: Introduction- importance and classification of fuel cells - description, principle, components, applications of fuel cells: H2-O2 fuel cell, alkaline fuel cell, molten carbonate fuel cell and direct methanol fuel cells.
Comparative analysis between traditional aquaponics and reconstructed aquapon...bijceesjournal
The aquaponic system of planting is a method that does not require soil usage. It is a method that only needs water, fish, lava rocks (a substitute for soil), and plants. Aquaponic systems are sustainable and environmentally friendly. Its use not only helps to plant in small spaces but also helps reduce artificial chemical use and minimizes excess water use, as aquaponics consumes 90% less water than soil-based gardening. The study applied a descriptive and experimental design to assess and compare conventional and reconstructed aquaponic methods for reproducing tomatoes. The researchers created an observation checklist to determine the significant factors of the study. The study aims to determine the significant difference between traditional aquaponics and reconstructed aquaponics systems propagating tomatoes in terms of height, weight, girth, and number of fruits. The reconstructed aquaponics system’s higher growth yield results in a much more nourished crop than the traditional aquaponics system. It is superior in its number of fruits, height, weight, and girth measurement. Moreover, the reconstructed aquaponics system is proven to eliminate all the hindrances present in the traditional aquaponics system, which are overcrowding of fish, algae growth, pest problems, contaminated water, and dead fish.
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
TIME DIVISION MULTIPLEXING TECHNIQUE FOR COMMUNICATION SYSTEMHODECEDSIET
Time Division Multiplexing (TDM) is a method of transmitting multiple signals over a single communication channel by dividing the signal into many segments, each having a very short duration of time. These time slots are then allocated to different data streams, allowing multiple signals to share the same transmission medium efficiently. TDM is widely used in telecommunications and data communication systems.
### How TDM Works
1. **Time Slots Allocation**: The core principle of TDM is to assign distinct time slots to each signal. During each time slot, the respective signal is transmitted, and then the process repeats cyclically. For example, if there are four signals to be transmitted, the TDM cycle will divide time into four slots, each assigned to one signal.
2. **Synchronization**: Synchronization is crucial in TDM systems to ensure that the signals are correctly aligned with their respective time slots. Both the transmitter and receiver must be synchronized to avoid any overlap or loss of data. This synchronization is typically maintained by a clock signal that ensures time slots are accurately aligned.
3. **Frame Structure**: TDM data is organized into frames, where each frame consists of a set of time slots. Each frame is repeated at regular intervals, ensuring continuous transmission of data streams. The frame structure helps in managing the data streams and maintaining the synchronization between the transmitter and receiver.
4. **Multiplexer and Demultiplexer**: At the transmitting end, a multiplexer combines multiple input signals into a single composite signal by assigning each signal to a specific time slot. At the receiving end, a demultiplexer separates the composite signal back into individual signals based on their respective time slots.
### Types of TDM
1. **Synchronous TDM**: In synchronous TDM, time slots are pre-assigned to each signal, regardless of whether the signal has data to transmit or not. This can lead to inefficiencies if some time slots remain empty due to the absence of data.
2. **Asynchronous TDM (or Statistical TDM)**: Asynchronous TDM addresses the inefficiencies of synchronous TDM by allocating time slots dynamically based on the presence of data. Time slots are assigned only when there is data to transmit, which optimizes the use of the communication channel.
### Applications of TDM
- **Telecommunications**: TDM is extensively used in telecommunication systems, such as in T1 and E1 lines, where multiple telephone calls are transmitted over a single line by assigning each call to a specific time slot.
- **Digital Audio and Video Broadcasting**: TDM is used in broadcasting systems to transmit multiple audio or video streams over a single channel, ensuring efficient use of bandwidth.
- **Computer Networks**: TDM is used in network protocols and systems to manage the transmission of data from multiple sources over a single network medium.
### Advantages of TDM
- **Efficient Use of Bandwidth**: TDM all
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
A review on techniques and modelling methodologies used for checking electrom...nooriasukmaningtyas
The proper function of the integrated circuit (IC) in an inhibiting electromagnetic environment has always been a serious concern throughout the decades of revolution in the world of electronics, from disjunct devices to today’s integrated circuit technology, where billions of transistors are combined on a single chip. The automotive industry and smart vehicles in particular, are confronting design issues such as being prone to electromagnetic interference (EMI). Electronic control devices calculate incorrect outputs because of EMI and sensors give misleading values which can prove fatal in case of automotives. In this paper, the authors have non exhaustively tried to review research work concerned with the investigation of EMI in ICs and prediction of this EMI using various modelling methodologies and measurement setups.
Using recycled concrete aggregates (RCA) for pavements is crucial to achieving sustainability. Implementing RCA for new pavement can minimize carbon footprint, conserve natural resources, reduce harmful emissions, and lower life cycle costs. Compared to natural aggregate (NA), RCA pavement has fewer comprehensive studies and sustainability assessments.
Iron and Steel Technology Roadmap - Towards more sustainable steelmaking.pdf
Non woven technology
1. Que 1- write a note on end uses of non woven.
Ans – Application of non woven fabric.
Personal care and hygiene - Baby diapers, feminine hygiene
products, adult incontinence items, dry and wet pads, but also
nursing pads or nasal strips, bandages and wound dressings.
Healthcare - like operation drapes, gowns, and packs, face masks,
dressings and swabs, isolation gowns, surgical gowns, surgical
drapes and covers, surgical scrub suits, caps.
Clothing - interlinings, insulation and protection clothing,
industrial workwear, chemical defence suits, shoe components,
etc.
Home - wipes and dusters, tea and coffee bags, fabric softeners,
food wraps, filters, bed and table linen, etc.
Automotive - boot liners, shelf trim, oil and cabin air filters,
moulded bonnet liners, heat shields, airbags, tapes, decorative
fabrics, etc.
Construction – roofing and tile underlay, thermal and noise
insulation, house wrap, understanding, drainage, etc.
Geotextile - asphalt overlay, soil stabilization, drainage,
sedimentation and erosion control, etc.
Industrial – cable insulation, abrasives, reinforced plastics,
battery separators, satellite dishes, artificial leather, air
conditioning, coating.
Que -3 – Briefly describe various finishing process of non woven.
Ans – Non woven fabrics require certain desirable properties like
mechanical finish and chemical finishes. Suitable method are used to
create finishing effect.
Mechanical finishing -
2. Splitting and winding – This process is used to produce non
woven fabric of high density. That is high basis weight and low
thickness.
Perforating – This process of finishing is used to enhance the
wicking property as well as softness and drape of fabrics.
Drying- During the process of manufacturing the nonwoven
fabrics are subjected to tension, which cause the fabrics to
distort dimensionally. That is the fabrics get stretched in length
and shrunk in width.
Calendering – The process of calendering can be said to be
more severe from of compaction process. The purpose of
calendering is to make the fabric compact with decrease
thickness and smooth surface.
Singeing- The purpose of singeing is to remove the protruding
fibres from the surface of the fabrics. The method of singeing is
basically categorized as direct and indirect singeing.
Shearing- It is also known as cropping or cutting, it is used for
removing surface fibres.
Raising – Raising is a process to create fibrous pile structures
on the surface of a pre-formed fabric. It increases the bulk and
improves the look and feel of nonwovens.
Polishing- Polishing improves the surface lustre in fabrics.
Surface fibres are reoriented in one preferred direction during
polishing, thereby increasing the lustre.
Softening- This process aims at enhancing bulk, softness and
drivability of fabric by reducing its stiffness. In order to increase
fabric softness further they are treated with enzymes and
chemicals.
3. Heat setting- Heat setting is carried out to achieve the
dimensional stability of nonwoven fabric containing
thermoplastic fibres.
Chemical finishing-
Antistatic agent- These finishing agent helps to prevent the static
charge build up specially on synthetic fibres.
Antimicrobial finishes- These types of finishes are used to prevent
the biological degradation of fabric by bacterial or fungal growth.
Lubricants- These are mostly used to reduce friction, whether it is
fibre to fibre or fibre to metal.They also help imparting softness to
certain fabrics.
Waterproof finishes- This type of finish is used to inhibit wetting
of fabrics. They can be applied to spraying, padding in aqueous
dispersion form .
Softeners- they provide softness to the fabrice. Softeners which
are hydrophilic in nature also increase the wettability of the
fabric.
Stiffeners- Stiffeners are the finishes which help to add stiffness
to the fabric. They are introduced to increase abrasion resistance
by welding of adjacent fabric.
UV Stabilizers- They are used to protect the adhesives and
polymers used as binders in the fabric from being degraded by
harmful ultra violet light.
Que -4 Write a note on various non woven bonding techniques.
Ans- Web bonding - Web has to be bonded using various methods to
provide strength to the non woven . The type of bonding has a direct
influence on the fabric properties in terms of strength flexibility,
4. softness etc. some webs are bonded using more than one technique to
achieve specific fabric characteristics
Mechanical technique-
Needle punching- barb needles are used
Stitch bonding – knitting needles are used
Spun lacing – hydroentangling
Chemical method-
Adhesive binders by a range of processes including spraying,
printing, saturating and foaming. Solvent method Softening or
partially dissolving fibres with a solvent to provide self – bonding
surfaces.
Thermal method –
It involves heat or pressure to fuse and weld fibres together at
points of intersection or in patterned bond sites that involve
including a fibre with a lower melting point in a web.
Differential shrinkage -
Involves some type of cotton staple nonwoven treated with
sodium hydroxide. The caustic causes the cellulose based fibres to
curl and shrink around one another so as to bind fibres in the
web.
Que 5- write a note on fibre used in nonwoven.
Ans - Non-woven were invented to use the waste from spinning into
cheap disposable, but now a day virtually all kinds of fibres used
depending on end use of products.
Natural fibre /regenerated fibre are biodegradable hence widely
used in disposable non woven.
In USA 90%of non woven were produced from polyester ,pp
,viscose and glass fibre out of which 49% ,consume polyester
staple fibre.
5. 1. Cellulose fibres due to hydroscopic are used for absorbent .
2. Cotton linters are used for a disposable purpose
3. Wood being high cost is used in bonded fabric from reclaimed
wool
4. Wool pulp has high water absorbency .bulk and low cost is used
for disposable absorbents like diapers ,tissue etc.
5. Viscose rayon is cheap to produce but has high absorption and is
used for disposables sanitary products and wipes.
6. Regenerated cellulose fibre like cuprammonium rayon are also
used for high absorption sanitary disposal.
7. All synthetic fibres are resistant to mildew & superior outer
surface for surgical bandage ,common fibre have high strength ,low
weight fatigue character ,chemical and temp resist corrosion resist
,high thermal & electrical conductivity. If it is preferred for air craft
sports etc.
8. Polyester have hydrophobic mesh dry outer surface of low weight
disposable even though inner absorbent is soluble
9. PP has high strength abrasion resistance ,sun light resistance are
used for protecting screens.
10. Polyamide 6 or polyamide 66 are preferred where non woven
need to absorb water.
11. Carbon fibre is light weight with strength ,fatigue character
,chemical& temp inert ,corrosion resistance high thermal &electrical
conductivity is used for good conductivity ,chemical & corrosion resist
etc.
6. 12. Glass fibre are used for filtration and thermal insulation due to
high strength, good conductivity, chemical and corrosion resist etc.
13. Aramid (kevlar) organic fibre having high toughness , self-
extinguishing is ideal for ballistic application.
14. Aramid organic fibre having high toughness ,self extinguishing is
ideal for ballistic application
15. Nano fibre with 0.04-2 micron diameter are used for finer webs
0.0005-0.015 oz/yd2
Bi- component fibres :two nylon polymer extruded side by side
through a spinneret .differential crimping or melting point give
advantage in bonding.
Que 8- with suitable sketch describe wet laid non woven techniques.
Ans - Wetlaid is used for paper making.
In wet laid uses longer fibre.
If more than 70% of material is wood pulp then that is a paper, 5-10
% of non woven roll goods are produced using these method.
The fibre are dispersedin water and then laid on a wire mesh to filter
the liquid and form a web, which is transferred to A drying felt before
finally being heat cured in a continue process.
This produce a web in which fibre are randomly oriented.
Process sequences :-
Wetting and dispersing fibres in water.
Transport of fibre dispersion to wards web – forming device.
Forming fibre web on the moving endless screen or perforated
drum.
Removing water by suction pressure and drying.
8. Que 9- with the suitable sketch describe felt loom.
Ans – felt loom – It produce one dimension fabric like geo textile,
interlining, home furnishing etc.
In felt loom Barbed needles are used.
The web passes between two plates, a bed plate on the bottom
and a stripper plate on the top. Corresponding holes in each plate
matches the needle gauge and alignment in the needle board.
The needle board is the base unit in to which needles are
arranged in non alignment arranged.
The needle board then fits in to the needle beam the stroke of
which various from 30 to 60 mm.
The gauge of the needle is defined as the number of needles per
square inch area.
9. For the coarser fibre 12 to 16 gauge needle are used.
For the synthetic / finer 25 to 40gauge needle are used.
Vertical up and down movement of needle causes penetration of
the needle through the thickness of the web.
The feed roll and draw roll rotation facilitate the web motion as it
passes through the needle loom.
Width of needle punch loom 2 to 16 m, speed 150 m/min.
Que 10- sketch and describe barb needle.
Ans – Barb needle – Barb needle are the heart of needle punching
process.
A needle has the following parts : crank , shank, blade point.
10. The crank is the 90 degree bend on the top of the needles, it seats
in top the needle board. The shank is the thickest part of followed
by the intermediate blade which fits directly in the needle board.
The blade is the working part of the needle having barbs that
passes in to the web and interlocks the fibre. Various cross section
of the needles blades include pinch blade, star blade, conical
blade etc.
Fig – needle blade
Point – The lower portion of the needle.
Type of point-
1. Ball point
2. Light ball point.
3. Rounded set point.
4. Polished point.
11. Fig :- point
Types of barb –
There are four type of barb. 1- Regular barb
2- Medium barb (MB)
3- Close barb (CB)
4- High density barb (HDB)
Fig :- type of barb.
12. 1- Regular barb - Regular barbed needle are commonly used. It
results in higher thickness of needle punched fabric.
RB is invariably preferred in pre needling and for high lofts and
wadding.
2- Medium barb – MB 4.8 mm spacing improves needling
efficiency and results in more compact products.
This needle is therefore preferred in waste fibre felts used as
underlays in carpet and shoddy.
3- Close Barb – CB with spacing b/w barbs 3.3mm in preferred in
finish needling.
So close barb needle results in a more compact and stronger non
woven then regular.
4- High density barb – this needle is preferred in finish needling
with thin products.
These needle are preferred for manufacture of synthetic leather
automotive trunk liner, shoe etc.
Geometry of barbed needle- The barb is known to the main working
component of needles a barb is characterized by kick up, barb angle ,
throat length, Barb heights.
13. Que 11- write a note on web parameters affecting felt properties.
Ans – web parameters-
Fibre length - Higher length of fibre causes less slippage
increasing strength above 40 mm is preferred but around 80 mm
gives uniform strength.
Fibre fineness – web becomes compact with reduction of fibre
denier which increase strength due to higher specific area of
contact. But finer fibers are weaker giving more breakage. Also
pore size decrease.
Surface roughness increase entanglement by less slippage bet
fibre and needle. Tribal fibre are better than round c/s.
14. Que 12 - Describe spun bonded non woven.
Ans – Spun bonded - Spun bonding is one of the most popular
methods of producing polymer-laid nonwovens.
Spun bonded nonwoven fabric are composed of continues
filament produced by a integrated fibre spinning web formation
and bonding process as it eliminate intermediate steps.
Fig – spun bonded process
This process is based on the melt spinning technique. The melt is
forced by spin pumps through a spinneret having a large number
of holes. The quench air ducts, located below the spinneret block,
continuously supply the conditioned air to cool the filaments.
There is also a continuous supply of auxiliary room temperature
air. Over the line’s entire working width, ventilator generated
under-pressure sucks the filaments and mixed air down from the
spinnerets and cooling chambers.
Characteristics and properties of spun bonded webs are:
1. Random fibrous structure
2. Generally the web is white with high opacity per unit area
3. Basis weight range between 10 – 200 k/m2
15. 4. Fibre diameter range between 15 and 35 m.
5.Web thickness range typically 0.2 – 1.5 mm.
6. High strength to weight ratios compared to other non woven,
woven and knitted structure.
7. High tear strength (for area bonded webs only)
8 . Good fray and crease resistance.
Que 13 - write a note on stitch bonded non woven.
Ans - It is formed by stitching of the fibre bundle with fibers or
yarn.
Fabric generally may have clear stitching pattern on one side
or both sides.
There are three main type of stitch bonded fabrics.
1. Fabric with one side stitch.
2. Fabric with one side stiches and one side projection of Pile
of pleating fibre.
3. Fabric with two side stitch.
Generally in stitch bonded fabric, yarn stitches alinged with
in the fabric plane.
The performance of the stitch bonded non woven are
dependent on the web density and structure, machine
gauge.
Que 7- with suitable sketch describe random web making.
Ans - Random web – Random fibre orientation in the web is
achieved by incorporating randomizing rolls in the card.
Random rolls are generally located between the main
cylinder & doffer.
16. The configuration diameter & position of the randomizing
rolls are different for the different manufacturer.
Que 6- write a note on web making for non woven.
Ans – The web may be made of staple fibres, filament, or from
polymer film.
17. Dry laid – For the production of non woven from staple fibers, a
carding process is required for fibers separation and web
formation. The website produced by this system are known as dry
laid.
Parallel laid - In the parallel laids webs the fibers are laid in a
length wise orientation.
This implies that this type of web has greater strength in the
length wise direction than the transverse direction.
According to the demand of mass and fibre type the parallel
laid web permits the reputation of fibrous web.
The number of layers in the web decides the number of
cards required.
Fig :- parallel laid
Cross laid - Cross laid web is made by either pendulum
conveyor ( vertical cross lapper) or Horizontal cross laper which
delivers the web at a specific rate on to a take up conveyor and
angle to the direction.
The web thickness and fibre direction is achieved in the
cross laid web.
Fig:- Cross laid
18. Electrostatic flocking - Fine fibre are given a static charge
between the plates of a condenser, and are than allowed to fall on
a moving belt to form a randomly orientated but uniform web.
Air laid - Air laid process is non woven web forming process in
which the web of fibres is produced by the dispersion of fibers
ranging from 1-4 mm.
Initially the fibres are dispersed in to a fast moving air
stream and belt or perforated drum under pressure or
vaccum.
Finally the fibres condense on the surface of moving belt or
drum in order to create web.
Fig :- Air laid web formation.
Wet laid - wet laid is used for paper making.
In wet laid uses longer fibre.
If more than 70% of material is wood pulp then that is a
paper, 5-10 % of non woven roll goods are produced using
these method.
19. The fibre are dispersed in water and then laid on a wire
mesh to filter the liquid and form a web, which is transferred
to A drying felt before finally being heat cured in a continue
process.
This produce a web in which fibre are randomly oriented.
Spun laid – Spun bonding is one of the most popular methods of
producing polymer-laid nonwovens.
Spun bonded nonwoven fabric are composed of continues
filament produced by a integrated fibre spinning web formation
and bonding process as it eliminate intermediate steps.