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.

1. WARP KNITTING MACHINE
MD.AZMERI LATIF BEG
M. Sc in Textile Engineering
Department of Textile Engineering,DIU

2. 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”.

3. 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.

4. 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.

5. 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.

7. • 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.

8. As compared to weft knitting in warp knitting also, the wales and course are
respectively called as overlap and under lap.

9. • 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.

10. • The face side of the fabric has rather clearly defined knit stitches generally running
vertically, 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.

11. Overlap
Underlap
• The under laps play a very important role in the pattern effects. The length or extent
of these underlap floats and their direction of running cause a variety of
designing possibilities.

12. Loops 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)

13. The formation of Stitch in warp knitting using a compound warp knitting needle.

14.  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.