Tuesday, March 27, 2012

Identification of knitted fabric defects

Presented By : Shourov Hasan

It is very natural that in the course of knitting fabrics, imperfections occur. The imperfections may be the result of faulty yarn, knitting machine malfunction or improper finishing. The defects in knitting construction are considered in terms of appearance and nature.

Various Types of Defects in Knitted Fabrics

Bands and Streaks 

There are different kinds of bands and streaks that may occur in knitting. Some of the popular defects are as follows:

Barrie Effect: A Barrie effect has the appearance of a stripe with shaded edges. It is horizontal in weft knits and vertical in warp knits. The barrie effect is caused by various factors like:

» Lack of uniformity in yarn size, color or luster.
» Mush tension on the yarns during knitting one section of the fabric.
» Uneven shrinkage or other finishing defects.

Bowing: A line or a design may curve across the fabric. This bowing is the distortion caused by faulty take-up mechanism on the knitting machine.

Streak or Stop Mark: A straight horizontal streak or stop mark in the knitted fabric is due to the difference in tension in the yarns caused by the machine being stopped and then restarted.

Skewing: Skewing effect is seen as a line or design running at a slight angle across the cloth.

 Needle Lines: Needle lines or vertical lines are due to a wale that is either tighter or looser than the adjacent ones. This is caused by needle movement due to a tight fit in its slot or a defective sinker.


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