Types Of Warp Knitting Machines
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Ferrari Kumar
Author at Textile Study Center
Studying Textile Engineering at Anna University , Chennai
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- Degumming of Silk - October 7, 2018
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Types Of Warp Knitting Machines
- Warp knitting is defined as a loop forming process in which yarn is fed into knitting zone , parallel to fabric selvedge .
- In warp knitting , fabric is made by forming loops from yarns coming in parallel sheet form run in the direction of fabric formation . ( warp beam like in weaving )
- So that warping process is essential for warp knitting .
- Every needle is fed by a separate yarn for loop formation . In order to connect the loops into a fabric , the yarns are shifted between the needles .
- All the yarns will be knitted in course simultaneously.
- For the purpose of shifting yarn , guide will be used.
Warp knitting machines are flat and comparatively more complicated than weft knitting machines.
Types Of Warp Knitting Machines :
1 . Tricot machine
2 . Raschel machine
Tricot Warp Knitting Machine :
Features :
- Initially only bearded needles were used .
- Fine filaments are knitted .
- Machine gauge up to 24 to 40( here gauge is number of needles per inch)
- Fabric is pulled at right angle to needle .
- Sinker controlled fabric throughout the knitting cycle.
- Low fabric take down tension.
- Number of guide bars usually not more than four.
- Machine speed is high ( up to 3500 courses per min )
- Machines are wider and comparatively simple structures are produced .
- Warp beams are positioned at the back side of the machine .
Raschel Warp Knitting Machine :
Features :
- Initially latch needles are used .
- More versatile – number of guide bars up to 16.
- Suitable for outer wear and furnishing .
- Any type of yarn can be used .
- Fabric controlled by high take down tension .
- Sinkers hold fabric only when the needles raise .
- Fabric pulled at about 160 degree to needle . machines are made in coarser gauges 24 to 64 ( here gauge is defined as number of needles per two inch )
- Machines are narrower and comparatively lower speed ( up to 2000 courses per min )
- Warp beams are positioned at the top of the machine .
Advantages :
- Due to the simultaneous knit , production rate will be much more higher than the weft knitting.
- The yarn is in criss-cross form to the adjacent wale line , so that dimensional stability will be much higher.
- Elongation of the fabric will be less.
Applications :
Warp knitted fabric will be used for apparel ,fashion fabric and technical textiles.
Apparel : Mens formal
Technical textiles : Medical textiles and auxetic textiles .
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Ferrari Kumar
Author at Textile Study Center
Studying Textile Engineering at Anna University , Chennai
Latest posts by Ferrari Kumar (see all)
- Effect Of Sliver Handling On Quality Of Sliver And Yarn - February 14, 2019
- Degumming of Silk - October 7, 2018
- Introduction to Desizing of Warp Yarns - June 14, 2018
tags:
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