File Name: woven fabric defects causes and remedies .zip
In fact, it has a lot of problems. Fabric inspection reveals countless defects ranging from drop stitches to color shading variation.
- Study of Gray fabric defect control method
- 20 Woven Fabric Defects with Pictures
- Woven Fabric Defects with their Causes and Remedies
Study of Gray fabric defect control method
Textile Apex. A guide to Textile and Clothing. Home Fabric Manufacturing. Like Me Tweet. As in other industries, the goal of the textile industry is to manufacture defects-free products.
However, defects do creep in at various stages of the processes of production, due to materials, machines or men. Faults of Woven Fabric with their Causes and Remedies.
The warp way defects are:. Crack between stripes. A crack seen along the length of the fabric between the stripes woven with different weaves. Double end. More than one end working in a heald eye without the adjacent end missing. Defect in a woven fabric where warp and weft threads do not interlace as desired. Incorrect positions of ends in the fabric causing considerable damage in fabrics with woven design or stripes. Missing end. Void caused by a missing warp thread in the fabric.
Reedy fabric. Fine cracks appearing across the fabric between groups of warp ends, matching with the pattern of denting in the reed. Individual warp thread floating over a group of weft threads.
Defect is more prominent in synthetic blended warps due to static electricity generation and hairiness of these yarns. Thick end. A warp end having diameter larger than normal. Warp streaks. Stripes running in warp way direction characterized by apparent differences in shade from the adjoining portions, arising mainly as a result of variation in the amount of light transmitted and reflected from groups of threads.
Weft way Defects. Broken pattern. Restricted to fabric woven with patterns on drop box looms. It occurs either when the sequence of weft colors to be put is disturbed or when the width of color band is affected. Improper adjustment of pattern cards or lattices. Weaver neglecting to adjust the pattern chain before restarting the loom after mending a break or a crack. Inserting pick in a wrong shed after mending a weft break. Check and adjust the pattern cards or lattices at the start of beam.
Resort to pick finding prior to restarting the loom. Broken pick. Weft break or weft exhaustion on ordinary looms. Weft break or improper size of bunch on auto-pirns. Improper functioning of weft fork. Weft change effected through weft fork mechanism on automatic looms.
Check the shuttle for loose fitting of pirn or roughness of surfaces as these cause more weft breaks. Check also the shuttle boxes for settings and surface condition to prevent cutting of weft. Check the shuttle and shuttle boxes. Ensure proper size of bunch on auto-pirns. Maintain the weft-fork mechanism in good working condition.
Resort to pirn change by weft feeler mechanism. Resort also to pick finding before restarting the loom. Cut weft. A defect generally randomly distributed over the fabric, not clearly visible in the grey stage, but becomes pronounced in the finished fabric. Improper condition or quality of emery roller covering. Viscose yarn from old lot or of lower strength is used. Check the emery roller covering. Ensure proper check on the quality of blended yarn. Double pick.
Two or more picks inserted in the same shed where only one is desired. Failure of the weaver to find out the correct shed when restarting an ordinary loom. Pirn change when affected by weft fork on automatic loom. Resort to pick finding while restarting. Effect the pirn change with weft feeler mechanism. Foreign matters like lint or waste or pieces of harness strapping and leather accessories woven into the fabric. Indiscriminate throwing of waste by weavers.
Foreign matter getting into the shed during weaving. Ensure cleanliness of machines and surroundings in the loom shed. Keep frequent check on harness strappings and leather accessories for undue wear and replace them, if necessary. Sloughing off. Thick bunches of yarn are woven into the fabric in the weft direction due to slipping off of coils of yarn from the pirn during weaving. Employ correct package characteristics in pirn winding. Ensure proper yarn tension during pirn winding in the case of rewound weft and in spinning in the case of direct weft.
Check the picking and checking mechanisms. Condition the weft before putting it on loom. An abnormally thick place in the yarn finally appearing in the fabric. Undrafted portion in the yarn. Minimize the incidence of slubs during spinning. Clear the yarns effectively during winding.
It is a short length of yarn, mostly weft, which has spontaneously doubled back on itself. The snarling tendency is latent in highly twisted yarns. In some fabrics, the snarls are found to be randomly spread over the width of the fabric, while in some other cases, they are restricted to a region at a fixed distance from one of the selvedges. Highly twisted weft. Low weft tension. Shuttle rebounding either due to harsh picking or poor checking. Centre weft fork not set right.
Condition the weft prior to weaving by steam conditioning, CMC conditioning or gumming. Provide suitable drag in the shuttle. Ensure smooth picking and adequate checking of shuttle in the boxes. Check the setting of centre weft fork. Starting marks. A thick or thin place is produced in the fabric due to variation in pick density while starting the loom.
Weaver letting back the fell of the fabric too close to the reed by faulty adjustment of take-up motion. Faulty functioning of anti-crack motion.
Instruct the weavers about the correct procedure. Ensure correct functioning of the motion. A higher pick density than the normal is referred to as starting mark while a lower pick density is referred to as crack. Improper letting back of the fell of the fabric. Improper lifting of the dead weights on let-off motion while adjusting the warp tension. Faulty functioning of anti-crack and weft fork mechanisms. Snagging of warp due to the shed being kept open for exceptionally long periods.
Guide the weavers about the right adjustment. Set the mechanisms properly. Stop the looms at healds leveled position so as to ensure minimum of warp tension during the stoppages.
Thick and thin places. Weft bars differing in appearance and repeating several times along the fabric.
20 Woven Fabric Defects with Pictures
Regret for the inconvenience: we are taking measures to prevent fraudulent form submissions by extractors and page crawlers. Correspondence: Dr. Received: November 05, Published: November 28, Study on different types of defects and their causes and remedies in garments industry. J Textile Eng Fashion Technol.
Warp way Defects · Avoid uneven build of beam surface by proper system of denting at the sizing machine. · Ensure that denting at weaving is.
Woven Fabric Defects with their Causes and Remedies
Knitted fabric defects and remedies by jahanara enam 9. A number of different methods have been proposed to determine the porosity of knitted fabrics, which include digital imaging, geometrical modeling, and air permeability. Dec 22, knitting machine settings related defects
Weaving is the intersection of two sets of straight yarns, warp and weft, which cross and interlace at right angles to each other. It is a complex work. Main faults in weaving are given below. The main reasons are late shedding, low warp tension and use of bad temples.
Muhammad Abu Taher , Md. Shipan Mia , Ashaduzzaman. All Rights Reserved.
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