Knit or Knitted Fabric Defects with Causes and Remedies
What is Knit Fabric in Textile?
Knitting or Knitted Fabric Defects with Causes and Remedies:
- Broken ends, holes or cracks,
- Drop stitch,
- Vertical stripes,
- Color fly or color triges,
- Tuck or double loop or stitches,
- Bunching up,
- Horizontal stripes,
- Soil stripes,
- Snagging or snags,
- Cloth fall-out,
- Distorted stitches or deformed or lifted loops.
All the above knitting faults have discussed in the following with their causes and remedies:
Holes are the result of yarn breakage or cracks during knit fabric manufacturing. The yarn had already broken in the region of the needle hook during loop formation.
|Fig: Hole mark in the fabric|
- Tension is too high during yarn running.
- The yarn is too much dry.
- Knots, slubs, etc.
- Weak places in the yarn break during stitching or loop formation.
- Faulty relation between dial loop and cylinder.
- The setting of the yarn feeder is not correct.
- Proper tension should be maintained during yarn running in the knitting process.
- Yarn should be kept in an accurate atmosphere.
- The proper relation between the cylinder and dial loop.
- An accurate setting of the yarn feeder should be maintained.
2. Drop Stitch:
|Fig: Drop stitch in the fabric|
- The faulty setting of the yarn feeder.
- Improper yarn feeder threaded-in.
- Defective take-up in the knitting process.
- Very dry material.
- Insufficient yarn tension.
- Proper setting of yarn feeder.
- Accurate yarn tension should be maintained.
- A fault-free take-up process should maintain during knitting.
- Perfect yarn feeder threaded-in.
3. Vertical Stripes:
|Fig: Vertical stripes in the fabric|
- Heavily running needle.
- Defective needle latch.
- Defective needle hook.
- Defective cylinder or dial.
- Bent needles.
- Damages on other knitting elements.
- A fault-free needle latch and needle hook should be used in knitting.
- Have to confirm defect-free dial or cylinder in a knitting machine.
- Damage-free elements should be used in the knitting machine.
4. Color Fly or Color Triges:
Color fly consists of singe fibers, bunches of fibers of yarn pieces in varying colors. It additionally sticks on the yarn or is knitted into the fabric and very difficult to remove.
- Hair with natural dark color, vegetable and food remnants bast, etc., or similar natural remnants in the case of other fibers.
- Fly coming from different processing stages during the spinning process. It can only be avoided by a careful operation of individual colors during fabric production.
- Fabric take-up too weak in the knitting process.
- The too much higher setting of the dial-in knitting machine.
- The insufficient sliding ability of yarn.
- The course density is not set correctly.
- Course density should be set correctly.
- The proper sliding ability of yarn is used in knitting.
- The perfect setting of the dial-in knitting machine.
6. Bunching Up:
|Fig: Bunching up in fabric|
- Thick place in yarn.
- The fabric takes up too weak in the knitting process.
- Faulty yarn should be avoided in knit fabric manufacturing.
- The proper process should be followed in the fabric take-up process in knitting.
7. Horizontal Stripes:
|Fig: Horizontal stripes in the fabric|
- Improper setting of yarn feeder.
- Comparison in the yarn running-in tension.
- Deflectors in dial cam brought into a tuck position.
- The jerky impulse from fabric take-up.
- At all feeders couriering not constant.
- Proper setting of yarn feeder should be maintained.
- Couriering should be constant at all the feeders.
8. Soil Stripes:
This type of fault can appear both in the direction of courses as well as wales caused by the knitting machine in the knitting industry. It is also known as needle stripes.
- A defective automatic greasing or oiling device is used in knitting.
- Individual needles have been replaced.
- Defect-free automatic oiling or greasing device should be used.
- Individual needles should not be replaced during knitting.
9. Snagging or Snags:
|Fig: Snagging or snags in the fabric|
Cloth fall-out is an area consisting of drop stitches lying side by side. It is produced when a yarn is laid out or when it breaks without any instant connection.
|Fig: Cloth fall-out|
It leads to a very unsettled fabric appearance. This type of defect is most disturbing in single-color yarded fabrics. Here, fabric appearance is skittering.