Faults of Woven and Knit Fabric
Faults of woven fabric:
Bar:
It is a band running across the full width of cloth. Pick bar due ti difference in pick spacing Tension-bar due to difference in weft tension Weft-bar due to difference in material count, twist etc
Box marks:
The causes of box marks are – Dirty box Shuttle riding over the weft Dirty shuttle Dirty picking and ticks
Broken pattern: It occurs due to wrong drawing of threads insertion of thee pick, incorrect lifting of warp threads.
Broken pick: A pick missing of the fabric, due to rough shuttle eyes, poor winding and weft yarn breakage.
Defective selvedge: Curled selvedge Cut selvedges Loppy selvedges Slack selvedges Pulled selvedge Tight selvedge Uneven selvedge
Float stitches: A place where warp and weft yarns escape the required interlacement. If occurs for improper warp stop motion.
Fuzzy: it occurs for the present of hairy and abraded yarns.
Hang pick: A pick which is out of line and is a triangular shape.
Missing ends: Gap of warp yarns is the main causes
Reed marks: Due to this fault cloth shows irregular spacing between groups of warp yarns across the fabric width.
Shuttle marks: Width way marks due to abrasion of warp yarns by the shuttle.
Stain:
Major problems on woven fabric Oil, Dust, Soil, Carbon particles in the air may cause stains.
Uneven cloth: It produced when take up motion is faulty, broken ratchet wheel is also responsible.
Some mechanical faults: Reed marks Shuttle flying out Shuttle trapping Loom hanging Loom stopping Weft cutting Bumping
Knitting Faults:
Holes: Holes are the result of yarn breakage. It occurs for the following causes – Uneven yarn Badly set of yarn feeder Knots, slubs etc in yarn Yarn tension is too high Yarn is too dry
Drop stitches: Those are the result of a defective needle. It also occurs when a yarn is not properly fed during stitch formation.
Cloth fall –out: it is an area consisting of
Bar:
It is a band running across the full width of cloth. Pick bar due ti difference in pick spacing Tension-bar due to difference in weft tension Weft-bar due to difference in material count, twist etc
Box marks:
The causes of box marks are – Dirty box Shuttle riding over the weft Dirty shuttle Dirty picking and ticks
Broken pattern: It occurs due to wrong drawing of threads insertion of thee pick, incorrect lifting of warp threads.
Broken pick: A pick missing of the fabric, due to rough shuttle eyes, poor winding and weft yarn breakage.
Defective selvedge: Curled selvedge Cut selvedges Loppy selvedges Slack selvedges Pulled selvedge Tight selvedge Uneven selvedge
Float stitches: A place where warp and weft yarns escape the required interlacement. If occurs for improper warp stop motion.
Fuzzy: it occurs for the present of hairy and abraded yarns.
Hang pick: A pick which is out of line and is a triangular shape.
Missing ends: Gap of warp yarns is the main causes
Reed marks: Due to this fault cloth shows irregular spacing between groups of warp yarns across the fabric width.
Shuttle marks: Width way marks due to abrasion of warp yarns by the shuttle.
Stain:
Major problems on woven fabric Oil, Dust, Soil, Carbon particles in the air may cause stains.
Uneven cloth: It produced when take up motion is faulty, broken ratchet wheel is also responsible.
Some mechanical faults: Reed marks Shuttle flying out Shuttle trapping Loom hanging Loom stopping Weft cutting Bumping
Knitting Faults:
Holes: Holes are the result of yarn breakage. It occurs for the following causes – Uneven yarn Badly set of yarn feeder Knots, slubs etc in yarn Yarn tension is too high Yarn is too dry
Drop stitches: Those are the result of a defective needle. It also occurs when a yarn is not properly fed during stitch formation.
Cloth fall –out: it is an area consisting of