Knit Fabric Faults in Production
Noor Ahmed Raaz
B.Sc. in Textile Engineering (CU)
Specialized in Apparel Manufacturing
Atish Dipankar University of Science & Technology
The procedure of knit fabric construction is two interlocking loops with the help of needles and yarns. During the manufacturing process the loops are close or loss formatted according to the fabric design. After the manufacturing procedure of knitted fabric there following few faults are taking place those are such as like broken ends, holes or cracks, drop stitch, cloth fall-out, snagging or snags, tuck or double loop/stitches, bunching-up, vertical stripes, horizontal stripes, soil stripes, color fly or color triges, distorted stitches or deformed or lifted loops, etc. Now i would like to discuss about the different types of knitting faults and their causes and also remedies.
Different Types of Knitting Faults:
There are few knitting faults are as follows-
- Broken ends, holes or cracks.
- Drop stitch
- Cloth fall-out
- Snagging or snags
- Tuck or double loop/stitches
- Vertical stripes
- Horizontal stripes.
- Soil stripes.
- Color fly or color triges.
- Distorted stitches or deformed or lifted loops.
Holes are the result of cracks or yarn breakage. During loop formation the yarn had already broken in the region of the needle hook.
- Relation between cylinder and dial loop not correct; yarn feeder badly set.
- Weak places in yarn, which break during stitch/loop formation.
- Knots, slubs etc.
- Yarn running-in tension is too high.
- Yarn is too dry.
2. Drop stitches:
Those are the result of a defective needle. They also occur when a yarn is not properly fed during stitch formation.
- Badly set yarn feeder.
- Yarn feeder wrongly threaded-in.
- Bad take up
- Very dry material
- Insufficient yarn tension.
3. Cloth fall-out:
It is an area consisting of drop stitches lying side by side. They can either when a yarn is laid-out or when it brakes without any immediate connection.
Snags mostly occur while processing filament yarns. The tendency towards can be reduced by using yarn with a coarser single filament count, lesser crimp elasticity and higher twist.
5. Tuck or double stitches:
These occur due to badly knitted or non-knitted loops. They are less intentional tuck loops or floats , also showing up as thick places or small leads in the fabric. As result instance they may also appear as a shadow when fabrics are observed against light.
Visible knots in the fabric referred to as bunching-up. They appear as feeds and turn up irregularly in the fabric.
Possible causes-thick place in yarn and fabric take-down too weak.
7. Vertical stripes:
Vertical stripes can be observed as longitudinal gaps in the fabric. the space between wales is irregular and the closed appearance of the fabric is broken up in an unsightly manner.
8. Horizontal stripes:
Horizontal stripes are caused by unevenness in the courses; they traverse horizontally and repeat themselves regularly or irregularly.
9. Soil stripes:
Soil stripes can appear both in the direction of wales as well as courses.
10. Color fly:
Color fly consists of singe fibers, bunches of fiber of yarn pieces in varying colors. It additionally sticks on the yarn or is knitted into the fabric and very difficult to remove.
11. Distorted stitches:
Distorted stitches lead to a very unsettled fabric appearance .They are most disturbing in single-color yarded goods. The fabric appearance is skittery.