weaving(Characteristics of defects of Different Fabrics and Their remedies) January 12, 2011 at 2:26pm Most of the fabric faults comes due following reasons 1. Yarn 2. Machine setting If the yarn that we are processing is weaker it will rise many problems at many stages and lowers the production and gives least quality fabric Machine setting is the second parameter being stand for many faults, if the yarn that we are going to process is enough to withstand frictional forces, stresses applied during processing but if machine setting isn’t done properly in accordance with yarn quality and machine restrictions than it will cause faulty fabric consequently lowers production rates. Streaks: thick/thin places in yarn known as streaks Causes: This is due to wrong count cone is used, that creates streaks in fabric. Defective reed can be one of its reason, if any of reed wires distance is disturbed. It will make thin the end where from its two wires being close to each other, and make end little bit relaxed than rest of the ends. Wrong denting, i.e. is denting of 3ends/dent instead of 2 ends/dent due to drawer. Remedies Use correct count of yarn that is ordered. Use new/fault free reed. Denting should be done properly. Oil stains: staining of oil on fabric Causes: Oil chain leak. Leakage of oil from tuck in. Remedies: Stop oil leakage from chain. Don’t over lubricate the tuck in / cease the oil leakage from tuck in device. Double Pick: Causes Double pick is due to faulty weft stop motion. Due to improper functioning of filling detector. Remedies Use fault free weft stop motion. Check the functioning of filling detector whether its working correctly or not. Double End: Causes Whenever an end breaks the worker fills that broken end in the reed of 2 end/dent or with drop wire already having 1 end/dent it causes double end. This fault can come due to sizing, if the end is broken in sizing and the personnel attach that wrongly with another size yarn that causes double end problem. This same problem can come due to warping also if broken end knotted wrongly to the another end. Remedy Do proper denting. Give proper attention in sizing, when attaching broken end. Do proper knotting. Short End: Causes This fault can come due to weaver, if a end breaks then he stops machine. After stopping he’ll repair that end and then runs machine. He must start machine after reversing a bit so that short end doesn’t come but he starts machine from the position where loom has been stopped. If any end breaks but loom continues to run and doesn’t sense that broken end this fault is due to sensor. Remedy Whenever repairing broken end, after repairing start the loom from precise point. Use correct sensing device. Reed mark: fabric shows irregular spacing between group of warp yarns across the width of fabric. Causes Due to improper reed guide wire. Due to low quality reed, it leaves mark where it from it get damaged. If any of reed wire is broken it will leave mark along the length of fabric. Improper reed setting. Joining of reed pieces, if we are having reed of 110” but we have a order of fabric width 100” then we cut the reed to 100” and process that. But after some time if again we get a order of 110” then most of the weavers join reed pieces that they had cut before. This will cause a fault. Due to late shedding Remedies Use proper, precise and good quality reed. Don’t use joint reed. Needle Mark of Tuck in / Needle Mark at selvedge: Cause This fault comes due to needle of tuck in box, which may be in the form of break/oil spot/ rust present on it, will cause needle mark along the length of fabric. Remedy Use precise, fine needle free of oil. Temple Mark: surface disturbance along the selvedge of fabric. Causes This fault due to tightness of temple. Due to jamming of temple rings. Due to improper ring size used for particular quality. Remedies Give required tension at temple. Use fine and well lubricated rings. Use proper size ring in accordance with fabric quality. Temple Cut: Causes Due to tightness of temple, it can cut the fabric. If rings of temple jam these will engage with any pick and cause deterioration in the fabric. Its remedy to use fine ring in accordance with fabric quality and with fine temple. Remedies Give required tension at temple. Use fine and well lubricated rings. Use proper size ring in accordance with fabric quality. Tuck in Short: Cause Its due to needle of tuck in, when it fails to bring the selvedge pick to the last edge then this fault occur. Remedy Its remedy to do the proper setting of needle and use precise needle. Miss Pick: Causes Weft cone runs short. Operator fault, in placing weft cone at proper time. Take up roller gear breakage Remedies Change short cone with new one. Operator must change weft cone when needed. Use new take up roller. Shuttle Marks: widthwise marks due to abrasion of warp yarns by the shuttle sheds not adjusted properly. Causes Shuttle not timed properly i.e. is too early or too late shedding. Remedy Shuttle timing must be proper.
Posted on: Mon, 24 Nov 2014 10:08:51 +0000
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