This document discusses common defects that can occur during dyeing, printing, and finishing of fabrics, as well as their potential causes. It provides examples of dyeing defects such as bleeding, crocking, shade bars, holes, off shades, and uneven dyeing that may result from issues with the material, water quality, or dye solution. Printing defects like flushing, bleeding, misfits, banding, unwanted pigment marks, and cracks can arise from problems with the print paste or screen. Finishing defects like unwanted marks, decolorized patches, pin holes, pucker, bowing, pilling, water spots, torn selvages, cuts, and soil are also explained. The document emphasizes understanding the
Quality is a relative term. It means customer needs is to be satisfied. Quality is of prime importance in any aspect of business. Customers demand and expect value for money. As producers of apparel there must be a constant endeavor to produce work of good quality. To assess the quality of textile product Textile Testing is very important work or process. Testing In response to ever-changing governmental regulations and the ever-increasing consumer demand for high quality, softlines testing and textile testing help to minimize risk and protect the interest of both manufacturers and consumers. It is important that testing is not undertaken without adding some benefit to the final product.
Quality is a relative term. It means customer needs is to be satisfied. Quality is of prime importance in any aspect of business. Customers demand and expect value for money. As producers of apparel there must be a constant endeavor to produce work of good quality. To assess the quality of textile product Textile Testing is very important work or process. Testing In response to ever-changing governmental regulations and the ever-increasing consumer demand for high quality, softlines testing and textile testing help to minimize risk and protect the interest of both manufacturers and consumers. It is important that testing is not undertaken without adding some benefit to the final product.
Sizing is the process of giving a protective coating on the warp yarn to minimize yarn breakage during weaving.
Sizing is the most important operation in preparing warp yarn for weaving especially with cotton yarn. The smallest error in sizing process may be very harmful. This may increase warp breakage rate on the looms and consequently reduce weaving production and quality. Therefore sizing is termed as the “Heart of Weaving”.
importance of fibre finess,influences of fibre finess ,effect on stiffness , effect on torsional rigidity, reflection of light , dye absoprtion, method of measurement ,gravimetric method, micronaire
Feeder stripe, Engineering stripe and Auto stripe mechanismAzmir Latif Beg
Auto stripe machine give stable structure with auto-stripper device, which could get various colors. Auto stripe & Engineering is commonly mark in use that does not goes with their definition. Today I will discuss regarding knit stripe patter.
Garment dyeing is the cost effectiveness of mass producing identical garments of particular colors.Garment dyeing is the process of dyeing fully fashioned garments (such as pants, pullovers, t-shirts, jeans, sweaters, dresses, bathrobes, casual jackets, shirts, skirts, hosieries) subsequent to manufacturing, as opposed to the conventional method of manufacturing garments from pre-dyed fabrics. A major drawback with this approach is the risk associated with carrying a large inventory of a particular style or color in today's dynamic market. Garment dyeing has been slowly emerging as a process to meet the ephemeral fashion trends adopted by the consumers and new machines and methods have made this process to wear a brighter future for it.The advantage of this process is the cost effectiveness of mass producing identical garments of particular colors.
Quick Response to the market (bar coding etc.,)
Ability to supply a wide range of colorations to the retailer, but only in the shades that are selling
Reduced discounted sales at inventory
Best way to achieved relaxed, casual look .Ability to create special effects such as tie dyed, pigment dyed and washed down in a single process etc.,
A major drawback with this approach is the risk associated with carrying a large inventory of a particular style or color in today's dynamic market.
Traditionally,
Fault Library 2016-2017 By Abdul Latif (+92 3127274200)latifaslam
This fault library will help to give awareness about faults and root causes & its corrective action to quality inspectors who are working in garment manufacturing industry.
Sizing is the process of giving a protective coating on the warp yarn to minimize yarn breakage during weaving.
Sizing is the most important operation in preparing warp yarn for weaving especially with cotton yarn. The smallest error in sizing process may be very harmful. This may increase warp breakage rate on the looms and consequently reduce weaving production and quality. Therefore sizing is termed as the “Heart of Weaving”.
importance of fibre finess,influences of fibre finess ,effect on stiffness , effect on torsional rigidity, reflection of light , dye absoprtion, method of measurement ,gravimetric method, micronaire
Feeder stripe, Engineering stripe and Auto stripe mechanismAzmir Latif Beg
Auto stripe machine give stable structure with auto-stripper device, which could get various colors. Auto stripe & Engineering is commonly mark in use that does not goes with their definition. Today I will discuss regarding knit stripe patter.
Garment dyeing is the cost effectiveness of mass producing identical garments of particular colors.Garment dyeing is the process of dyeing fully fashioned garments (such as pants, pullovers, t-shirts, jeans, sweaters, dresses, bathrobes, casual jackets, shirts, skirts, hosieries) subsequent to manufacturing, as opposed to the conventional method of manufacturing garments from pre-dyed fabrics. A major drawback with this approach is the risk associated with carrying a large inventory of a particular style or color in today's dynamic market. Garment dyeing has been slowly emerging as a process to meet the ephemeral fashion trends adopted by the consumers and new machines and methods have made this process to wear a brighter future for it.The advantage of this process is the cost effectiveness of mass producing identical garments of particular colors.
Quick Response to the market (bar coding etc.,)
Ability to supply a wide range of colorations to the retailer, but only in the shades that are selling
Reduced discounted sales at inventory
Best way to achieved relaxed, casual look .Ability to create special effects such as tie dyed, pigment dyed and washed down in a single process etc.,
A major drawback with this approach is the risk associated with carrying a large inventory of a particular style or color in today's dynamic market.
Traditionally,
Fault Library 2016-2017 By Abdul Latif (+92 3127274200)latifaslam
This fault library will help to give awareness about faults and root causes & its corrective action to quality inspectors who are working in garment manufacturing industry.
Knowing the basics of raw material, yarn production process and the other factors influencing quality will put the sourcing manager at the same eye level as a spinner /supplier when negotiating quality issues.
As a consequence this puts the sourcing manager in the position to pay the right price for the corresponding quality level.
This kind of know-how supports a retailer enormously in his efforts to establish a reliable supply chain which is based on mutual understanding.
Printers are familiar with the problem: Printing sheets stick together because
they are electro-statically charged. The result: Several sheets are simultaneously
sucked in from the stack, stopping up the feeder. Static electricity arises from
Either an electron deficit (positive charge) or an excess of electrons (negative
charge) on the surface of the paper.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Forklift Classes Overview by Intella PartsIntella Parts
Discover the different forklift classes and their specific applications. Learn how to choose the right forklift for your needs to ensure safety, efficiency, and compliance in your operations.
For more technical information, visit our website https://intellaparts.com
HEAP SORT ILLUSTRATED WITH HEAPIFY, BUILD HEAP FOR DYNAMIC ARRAYS.
Heap sort is a comparison-based sorting technique based on Binary Heap data structure. It is similar to the selection sort where we first find the minimum element and place the minimum element at the beginning. Repeat the same process for the remaining elements.
NUMERICAL SIMULATIONS OF HEAT AND MASS TRANSFER IN CONDENSING HEAT EXCHANGERS...ssuser7dcef0
Power plants release a large amount of water vapor into the
atmosphere through the stack. The flue gas can be a potential
source for obtaining much needed cooling water for a power
plant. If a power plant could recover and reuse a portion of this
moisture, it could reduce its total cooling water intake
requirement. One of the most practical way to recover water
from flue gas is to use a condensing heat exchanger. The power
plant could also recover latent heat due to condensation as well
as sensible heat due to lowering the flue gas exit temperature.
Additionally, harmful acids released from the stack can be
reduced in a condensing heat exchanger by acid condensation. reduced in a condensing heat exchanger by acid condensation.
Condensation of vapors in flue gas is a complicated
phenomenon since heat and mass transfer of water vapor and
various acids simultaneously occur in the presence of noncondensable
gases such as nitrogen and oxygen. Design of a
condenser depends on the knowledge and understanding of the
heat and mass transfer processes. A computer program for
numerical simulations of water (H2O) and sulfuric acid (H2SO4)
condensation in a flue gas condensing heat exchanger was
developed using MATLAB. Governing equations based on
mass and energy balances for the system were derived to
predict variables such as flue gas exit temperature, cooling
water outlet temperature, mole fraction and condensation rates
of water and sulfuric acid vapors. The equations were solved
using an iterative solution technique with calculations of heat
and mass transfer coefficients and physical properties.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
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.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
6th International Conference on Machine Learning & Applications (CMLA 2024)ClaraZara1
6th International Conference on Machine Learning & Applications (CMLA 2024) will provide an excellent international forum for sharing knowledge and results in theory, methodology and applications of on Machine Learning & Applications.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
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2. The reasons like water, fiber sources & processing
conditions is responsible for defects during wet
processing. However, in order to overcome/
minimize the processing related problems it is
essential to first understand the Symptoms
(problems), Diagnose (ascertain the probable
cause) & Cure (adopting remedial measure).
Some defects of various stages are disscussed
below:
3. Causes Of Dyeing Defects
Due to Material:
– Material having dead fibers or other defective fibers.
– Left over of Chemicals after scouring, bleaching etc.
– Material not properly singed, desized.
– Material not properly mercerized.
– Absorbency of the fabric not proper.
– Sticking of insoluble material on the fibers.
– Impurities are not removed properly.
– Uneven heat treatment.
4. Causes Of Dyeing Defects
Due to Water Quality:
– More Hardness of water
– Water has metal ions such as iron.
– pH of water not proper
– Water having more chlorine
Due to Improper Dye Solution:
– Improper weight ratio of colors, material and chemicals.
– Improper material to water ratio
– Improper filtering of concentrated colors.
6. Bleeding
• It’s a loss of color when the dyed
fabric is wetted or emerged in
water.
• The water here, becomes colored
and may cause discoloration of
other fabrics.
• This is usually due to either
improper dye selection or poor
dye fastness.
7. Crocking
• It is the rubbing off of
the color.
• It may rub onto
another fabric.
• This may be due to
inadequate scoring
subsequent to dyeing.
8. Shade Bar
• It is a horizontal band of
a different hue running
across the fabric.
• It may be caused by a
change of filling bobbin
in the loom or a loom
stop and start up
9. Hole in sulfur dyed fabric
• Caused due to tendering which
takes place because sulphur is
converted into sulphuric acid
after oxidation which is harmful
for the cellulosic fibers.
• This is a major defect. The defect
occurred after washing the
garment.
10. Off Shade
• It refers to color that doesn't exactly match
the standard or the prepared sample.
• This may be due to faulty dye foundation or
application or may be due to variation in dye
lot.
17. Flushing/Wicking
• Caused due to Low viscosity of
print paste.
• It occurs when the printed area
bleeds out into the unprinted
area. The result is a ‘haloing’ or
shadowing effect around the
outline of the pattern design.
18. Bleeding
• Caused due to Low viscosity of
print paste
• It is major defect as it happens
throughout the fabric unless
the viscosity is corrected.
19. Misfits
• A misfit is a print defect caused by improper alignment of the
screens. Also known as “out of registration, misfits leave
unprinted areas in the design.
• For example, a green leaf may overlap its black outline or
print over another color.
20. Banding
• Defect created by the print head’s movement over the
substrate.
• Use of scanning print head, or a print head that moves back and
forth across the substrate in straight line placing drops of ink at
precise locations along the line.
• If the head is not properly aligned, or if the substrate advances
unevenly, the result is a slight horizontal “band” or line of
unprinted area.
21. Unwanted pigment
marking on fabric
• Caused due to screen has holes
in it that should have been
covered. This could be because
of ageing of the screen and
eventual damage or just
improper exposure to light.
22. Crack or miss alignment in
transfer printed fabric.
• Incomplete transfer of design
from paper to fabric on transfer
printing due to removal of
transfer of paper while the
fabric was still hot.
24. FABRIC FINISHING
• A series of processing operations applied to
gray fabrics to enhance their appearance and
hand, properties and possible applications.
• Play a fundamental role for the commercial
excellence of the results of textiles
25. FABRIC FINISHING
• The most simple form of finishing is the
ironing or pressing on the fabric.
• In finishing , the fabric is subjected to
mechanical and chemical treatment in which
its quality and appearance are improved and
its commercial value enhanced.
• Physical finishing techniques(dry finishing
processes) or chemical finishing methods(wet
finishing) are used.
26. FABRIC FINISHING
• Functional finish:
– Wearability, Hand, Mechanical resistance,
Easy care, Wettability, Washability,
Deformability, Anti bacterial, Anti fungal,
Soil-proof and Fire-proof ability
• Aesthetic finishes:
– Aesthetic looks
27. Unwanted marks on fabric.
• Oily stains with dust adhered to
surface which makes the stains
more prominent and difficult to
remove, due to contact with oil
or grease covered exposed
machine parts, careless handling
could be another cause.
28. Decolorized patch on fabric
• Caused due to
– chemical spillage on fabric.
– Localized excess bleaching.
– Localized excess enzyme wash.
• Can be result into weakening of
the fabric.
29. Pin Holes
• Holes along selvage caused by pins holding fabric while it
processes through tenter frame.
• Major defect if pin holes extend into body of fabric far
enough to be visible in the finished product.
30. Sanforize Pucker
• Results from uneven wetting out on sanforize.
• usually caused by defective spray heads.
• Fabric will appear wavy or puckering when spread on cutting
table.
• Difficult to detect during inspection on inspection machine
with fabric under roller tension.
31. Bowing
• Usually caused by finishing.
• Woven filling yarns lie in an arc across fabric width; in knits
the course lines lie an arc across width of goods.
• Establish standards of acceptance. Critical on stripes or
patterns; not as critical on solid color fabrics.
32. Pilling
• Pilling is a common fabric defect occurring on knitted and
woven fabrics.
• In producing a yarn, long fibers tightly-twisted produce a
serviceable yarn. When short stable fibers are mixed into the
yarn the result is a yarn that will not hold together. The short
staple fibers will separate from the yarn and curl up in a ball,
forming what is referred to as a pill.
• Pilling is accentuated by the friction of normal wear, washing
and routine dry cleaning.
33. Water Spots
• Usually caused by wet fabric being allowed to remain too long
before drying; color migrates leaving blotchy spots.
Selvage Torn
• Usually caused by excessive tension while processing through
tenter frames.
34. Cuts or Nicks
• Caused by indifferent handling of scissors. snips or
mechanical trimmers.
Soil
Caused by oil, grease or dirt. Often times originating from
a dirty work area or machinery not properly cleaned