FinishingRelated
Defects:
Defects caused mainly due to the wrong process parameters are;
Defects caused mainly due to the wrong process parameters are;
- High Shrinkage
- Skewing
- Spirality
- Surface Hairiness & Pilling
- Tonal variation
- Snagging (Sharp points in the dyeing machine or trolley etc)
- Fold Marks
- Wet Squeezer Marks
- GSM variation
- Fabric Width variation
- Curling of S.J. Fabrics
DropStitches
(Holes)
Definition:
Drop Stitches are randomly appearing small or big holes of the same or different size which appear as defects in the Knitted fabrics.
Definition:
Drop Stitches are randomly appearing small or big holes of the same or different size which appear as defects in the Knitted fabrics.
Hole in fabric
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Major
Causes:
- High Yarn Tension
- Yarn Overfeed or Underfeed
- High Fabric Take Down Tension
- Defects like Slubs, Neps, Knots etc.
- Incorrect gap between the Dial & Cylinder rings.
Remedies:
- Ensure uniform yarn tension on all the feeders with a Tension Meter.
- Rate of yarn feed should be strictly regulated as per the required Stitch Length.
- The fabric tube should be just like a fully inflated balloon, not too tight or too slack.
- The yarn being used should have no imperfections like; Slubs, Neps & big knots etc
- The gap between the Cylinder & the Dial should be correctly adjusted as per the knitted loop size.
Barriness
Definition:
Barriness defect appears in the Knitted fabric in the form of horizontal stripes of uniform or variable width.
Causes:
Definition:
Barriness defect appears in the Knitted fabric in the form of horizontal stripes of uniform or variable width.
Causes:
- High Yarn Tension
- Count Variation
- Mixing of the yarn lots
- Package hardness variation
Remedies:
- Ensure uniform Yarn Tension on all the feeders.
- The average Count variation in the lot should not be more than + 0.3
- Ensure that the yarn being used for Knitting is of the same Lot .
- Ensure that the hardness of all the yarn packages is uniform using a hardness tester.
Streakiness
Definition:
Streaks in the Knitted fabrics appear as; irregularly spaced & sized, thin horizontal lines.
Causes:
Definition:
Streaks in the Knitted fabrics appear as; irregularly spaced & sized, thin horizontal lines.
Causes:
- Faulty winding of the yarn packages.
- Yarn running out of the belt on the Pulley
Remedies:
- Winding of the yarn package should be proper.
- The yarn should be running between the belt and around the pulley.
Imperfections
Definition:
Imperfections appear on the fabric surface in the form of unevenly placed or randomly appearing Knots, Slubs & Neps, Thick & Thin places in the yarn.
Causes:
Definition:
Imperfections appear on the fabric surface in the form of unevenly placed or randomly appearing Knots, Slubs & Neps, Thick & Thin places in the yarn.
Causes:
- Big Knots, Slubs & Neps in the yarn, Thick & Thin yarn.
Remedies:
- Specify the quality parameters of the yarns to be used for production to the yarn supplier.