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DIVYANKA U. DHANURKAR 084051010 VAIBHAV V. GAIKWAD 084050113 DIPALI C. DHOLE 084051011. Knitting technology.
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DIVYANKA U. DHANURKAR 084051010 VAIBHAV V. GAIKWAD 084050113 DIPALI C. DHOLE 084051011 Knitting technology
Knitting is a process of manufacturing a fabric by the intermeshing of loops of yarns. The two main forms of knitting technology are Warp knitting Weft knitting introduction
COURSES: Rows of loops across the width of the fabric produced by adjacent needles during the same knitting cycle. (measured in courses/cm). WALES: Vertical column of needle loops. Determines the width of the fabric (measured in Wales/cm). STITCH DENSITY: Represents the total number of needle loops in a given area. STITCH LENGTH: is the length of yarn in knitted loop. KNITTING TERMINOLOGIES
Direction- horizontal WEFT KNITTING
Direction-vertical Warp knitting
Knitting cams • Clearing cam/Rising cam • Stitch cam • Running cam/ upthrow cam • Guard cams
New yarn is taken Previous loop formed goes below the latch Needle goes to a maximum height The hook pulls the new yarn & loop is formed General loop formation of weft needle
Loop formation of warp knitting machine • Start of new course • Start of overlap • Guide bar swinging motion • Return swing after overlap • Old loop closing latch • Knock over & underlap movements
Full tricot locknit Warp knitted structures
Three needle sharkskin Three needle queenscord
Basic weft knitted structures • Simplest & most widely used weft knit structure • Fabric unroved from end • Fabric tends to curl at the edges • Production rate is high
Rib knit structure • It is reversible structure • It gives a balanced structure • Fabric does not curl • Maximum extensibility in widthwise direction • Rib structure can not unroved
Purl knit structure • Consists of reverse & face courses • Very little commercial & apparel end use • Extensibility in length wise direction • Fabric does not curl • Suitable for socks & sportswear
Interlock fabric • It gives a reversible appearance • Fabric is firm • It does not curl at edges • Production rate is reduced to half • Structure is thicker, stronger & less elastic • Cost of fabric is high
Fabric structure Fibres type Stitch length Relaxation Yarn linear density Factors affecting on dimensional properties
Geotextiles Coverings Safety textile Industrial textile Medical textile Composites sportswear Nets Applications of Knitted Fabric
The world produces over 17 tons of knitted textiles and apparel - representing one third of the global textile market. Moreover, output is forecast to grow by 25% over the next ten years, reaching more than 21 tons. Markets for Technical Textiles