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WARP KNITTING MACHINE
MD.AZMERI LATIF BEGM. Sc in Textile Engineering
Department of Textile Engineering,DIU
Lingerie, sportswear, outerwear, upholstery, automotive textiles, toy plush, shoe fabrics, light weight coating substrates and mosquito nets
Warp knitted fabrics have several industrial uses, including producing mosquito netting, tulle fabrics, sports wear, shoe fabric, fabrics for printing and advertising, coating substrates and laminating backgrounds.[
The warp knitting process is also being used to create biotextiles. For example, a warp knitted polyester cardiac support device has been created to attempt to limit the growth of diseased hearts by being installed tightly around the diseased heart. Current research on animals “have confirmed that...the implantation of the device reverses the disease state, which makes this an alternative innovative therapy for patients who have side effects from traditional drug regimes”.
THERE IS A GREAT VARIETY OF APPLICATION FIELDS AND A LOT OF ASSOCIATED REQUIREMENTS FOR THE WARP KNITTED FABRICS. THE VAST SPECTRUM OF HIGH-MODERN TEXTILES REQUIRES VERY DIFFERENT BASIC CONDITIONS AND DIVERSE EMPHASES IN PRODUCTION. CONSIDERING THE VARIOUS MATERIALS AND THE - IN PART - HIGHLY-SPECIALISED FINAL APPLICATIONS, IT IS OBVIOUS THAT MERELY ONE MACHINE CONFIGURATION CANNOT REPRESENT THE SOLUTION FOR OPTIMUM QUALITY AND FLEXIBILTY.
WARP KNITTING MACHINES
The Used Machinery Warp Knitting Machines category covers the full range of warp knitting machines (tricot knitting machines (tricot machines) and raschel knitting machines (raschel machines)), crochet machines and warping machines for warp knitting. Tricot machines for example are used in sportswear, intimate apparel and in backing fabrics for artificial leathers. Raschel machines are used to produce lace fabrics for lingerie and net curtains but are also used in other formats for technical textiles applications.
Second hand warp knitting machines (used warp knitting machines) are available from a range of warp knitting machine builders.
WARP KNITTING MACHINES
Warp knitting and crochet machines are used to produce a huge range of warp knitted fabrics (warp knits) for clothing, household textiles and technical textiles. Warp knitting machines are either single needle bar machines or double needlebar machines and are available in a wide range of gauges and widths, Modern machines are electronically controlled in terms of patterning, beam let-off and fabric take-up.
The range of new warp knitting and crochet machines available is wide and warp knitting machine manufacture is dominated by German machine builder Karl Mayer. Other warp knitting players are Germany's Liba and a number of Chinese manufacturers including Run Yuan. Crochet machines are built by Italy's Comez and Spain's Rius amongst others. The market for used warp knitting and crochet machines is dominated by the same manufacturers.
WARP KNITTING FABRICS
WARP KNITTING• Warp Knitting is defined as a stitch forming process in which the yarns are supplied to the knitting zone parallel to the selvedge of the fabric. ,i.e. In the direction of wales.
• In Warp knitting machine, every knitting needle is supplied with at least one separate yarn. In order to connect the stitches to form a fabric ,the yarns are deflected laterally between the needles.
As compared to weft knitting in warp knitting also, the wales and course are respectively called as overlap and under lap.
DEFERENTIATING WARP AND WEFT FABRICS
• The warp knitted fabric structure has dissimilar appearance on the technical face and technical backside of the fabric.
• All warp-knitted fabrics can be identified and distinguished from weft knitted materials by careful examination of the face and back of the fabric, usually with the help of a Pick glass.
• The face side of the fabric has rather clearly defined knit stitches generally runningvertically, but slightly angled from side to side.
• The technical backside of the fabric, the diagonal line of yarns i.e.underlaps run right And left throughout in a zigzag manner.
Overlap
Underlap
• The under laps play a very important role in the pattern effects. The length or extentof these underlap floats and their direction of running cause a variety of designing possibilities.
WARP KNITTED LAPSLoops are termed ‘Laps’ in warp knitting because the warp guides lap their yarn around the needles in order to form the loop structure. WARP KNITTED STRUCTURE
The stitch(overlap) The linking(underlap)
The formation of Stitch in warp knitting using a compound warp knitting needle.
CHARACTERISTS OF WARP KNITTED FABRICS
Extremely versatile in pattern effects with yarn.
Rigid to elastic
Good air and water permeability
Good crease resistance
Good drapability
Good dimensional stability
Good strength.
THERE ARE THREE MAIN IMPORTANT MACHINE PARTS IN CROCHET WARP KNITTING MACHINE. THEY ARE-
1.WARP YARN GUIDE BAR.2.NEEDLE BAR.3.LAYING IN BAR
NAME OF BAR REQUIRED MOTION 1. NEEDLE BAR TRAVERSE MOTION
2. WARP YARN GUIDE BAR SWINGING & SHOGGING
3. LAYING IN BAR SHOGGING
MOTOR DRIVES THE THREE BAR THROUGH GEARING & USING LINK, CAM.1. FIRSTLY MOTOR DRIVES THE MOTOR PULLEY.2. MOTOR PULLEY DRIVES THE MAIN SHAFT THROUGH INTERMEDIATE
PULLEY.
3. FROM MAIN SHAFT MOTION GOES TO THREE DIFFERENT BARS.
4. ONE MOTION TRANSFERS TO THE NEEDLE BAR & NEEDLE BAR GETS TRAVERSE MOTION THROUGH LINK.
5. ANOTHER MOTION GOES TO THE WARP YARN GUIDE BAR TO GIVES IT SHOGGING MOTION.
6. WARP YARN GUIDE BAR GETS SWINGING MOTION FROM THE LINK WHICH IS CONNECTED WITH NEEDLE BAR.
7. LAST MOTION GOES TO THE LAYING IN BAR. THERE IS A PATTERN CYLINDER WHERE PATTERN LINK CHAIN IS MOUNTED ON IT.8. A FOLLOWER IS PLACED ON THE PATTERN LINK CHAIN WHICH MOVES THE FOLLOWER TO A SPECIFIC DISTANCE FOR LAYING IN.
9. BY THESE THREE BARS MOVEMENT WARP KNITTING CAN TAKE PLACE IN CROCHET WARP KNITTING MACHINE.
Thank you all