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Advantages and Disadvantages of Warp Knitting Tricot and Raschel machines
Tricot machines Characteristics Characteristics
• Compound sinker bar (2-point knockover). • Warp beams are placed mainly at the back of the machine or perhaps above the machine. machine. • Needles can be changed from the front side of the machine. machine. • Up to 5 guide bars are used at the moment. • Use of compound needles. • Starting-up without fabric take-up possible. • Only pillar loops cannot be knitted (only by support through inlay motion),(lateral motion),(lateral 2-point knockover) • Angle between incoming yarn sheet and fabric take-up is 90° (considerable needle stress). • Simple machine construction. construction. • Short run-in of the t hreads because because of the beam positions. positions. • High number of courses possible up to total stop of the beams (for pleats) because working without fabric take up is possible. possible. • High yarn run-in is possible (overfeed). • Handling of the knitting elements from the knitter's side possible. possible. • Piles for terry effects are possible. possible. • Simple construction of pile fingers for plush. • Soft fabric touch.
Disadvantages of Tricot machines • Problems with small number of stitches and reduced yarn run-in (fabric take-up 90°) (high tension for the needle, loose selvedges lead to yarn twisting and fault). • Processing of elastomeric yarn mainly possible only as loop. • Net constructions are difficult to be made since the knock-over of the wales connection connection is not possible (lateral 2-point knock-over). knock-over). • Processing of filler yarns is very difficult (see fabric take-up,90°). • Common machine gauges gauges from E 24 to E 40.
Raschel machines Characteristics
• Separate knock-over bar (trick plate) 3-1point knock-over and stitch comb bar. • Warp beams are placed on the top of the machine. • Needles have to be changed from the back side of the machine (due to the knock-over comb bar). • Nowadays up to 78 guide bars are possible. • Usage of compound needles and sometimes of latch needles. • Loop formation without fabric take-up is not possible;main knockover at the front edge (take-up). • Angle between incoming yarn sheet and fabric take-up is 170°(low needle stress). • High take-up tension allows the production of open fabric structures and the manufacture of elastomeric inlays (powernet) as well as the production of elastic pleated fabrics. • Vertical laying-in (filler threads) can be processed (170°fabric take-up). • The high yarn tension does not affect the needles directly. Hence, low stitch densities and short yarn run-in possible at high fabric stability and low needle stress. • Various materials can be used: film tapes, glass,aramide, carbon, metal wires. • Wide range of gauges.
Disadvantages of Raschel machines • Starting-up only with fabric take-up possible. • Loose yarn run-in (overfeed) and high stitch densities(velvet, pleats) are not possible fabric touch less soft. • Longer yarn path due to beam positions. • Changing of needles only from the back side.
