Sunday, January 27, 2019

WEFT LOOPING IN THE FABRIC, A FABRIC DEFECT, A WEAVING DEFECT, CAUSES , AND REMEDIES

WEFT LOOPING IN THE FABRIC: 
When the weft insertion system fails to tighten the weft yarn or the weft yarn does not become tight due to any other reason, the weft looping problem is generated. This is a very prominent defect. This is not acceptable in the fabric. Fabric gets completely rejected due to this defect. The one reason for this defect is the uneven weft tension during weaving. Sometimes, the cotton fluff is accumulated between the two tension blades of weft tensioner. Thus uneven weft tension created which results in the form of weft looping.
The late shed crossing timing also causes weft looping problem. The early crossing of catch selvedge (waste selvedge device) also helps to avoid the weft looping problem.  It is often noticed that loom technician always chooses a safer side when he adjusts the stroke setting of rapiers in rapier looms. He keeps extra clearance between reed and gripper during gripper exit and gripper entry. This practice also helps to generate weft looping problem in the fabric. Please not loom technician should always follow the setting instruction of loom manufacturer. Sometimes, the weft releasing time at receiving side also causes the weft looping problem.

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