Knitting Elements of Raschel Warp Knitting Machine
Rofiquzzaman Raju
Fabric Technologist,
B.J.Group, Mawna, Gazipur
Email: rtextile.finance@gmail.com
Raschel warp knitting machine:
I already published an article on “Features and Uses of the Raschel Warp Knitting Machine“. Before knowing about knitting elements of raschel knitting machine we should know overview of this machine.
- Raschel machines are heavier and produce heavier fabrics.
- Older Raschel machines have latch needles with knitting speeds of 800–900 spm.
- New Raschel machines use compound needles, with Raschel machines knitting more than 1300 spm
- The fabric angle to the warp on Raschel machines is 160° take-up.
- On Raschel machines, fabric take-up tension is high.
- Raschel machines knit up to 1500 denier yarn.
- Raschel machines are more versatile and are used for fancy pattern work.
Knitting elements of raschel warp knitting machine:
The knitting elements of the raschel warp knitting machine are described as follows:
1. Needle:
Most of the modern Rachel knitting machines built today use compound needle. Many m/cs, however, are still equipped with latch needles. Compound needles are set as in Tricot m/cs into trick which are cut into the needle bar and both main parts and closing elements are driven separately to open and close the hook.
The latch needles, especially developed for those machines, are cast in units, one inch long. The latch of the needle depends for its knitting operation, on the yarn.
2. Trick plate:
The loop formation in a Rachel m/c takes place on the upper edge of the trick plate. This bar can be considered as a needle bed, since the needles are placed in tricks cut into it.
3. Sinker:
The sinker like the latch needles are cust in units 1″ long placed in the spaces between the needles. They are used to ensure that the fabric stays bowl while the needle rise to form their next knitting cycles. The sinker of Rachel m/cs are therefore only of secondary importance.
4. Latch guard:
A steel wire which are extended from one ends to the others parallel to the needle. During loop formation, the fabric loops open needle latch but sometimes closed the needle hook. As a result a closed hook cannot feed the new yarn. This latch guard placed needle hook side. So that the latch cannot close the hook and helps to open the needle hook.
5. Guide & Guide bar:
The number of guide bar in Rachel m/c is more. Sometimes are of more than 70. Two types of guide bar are used-
- Fully threaded guide bar: Used to produce ground fabric and yarn pass to each guide.
- Partially threaded guide bar: According to the design. One yarn is passed in each bar for each pattern repeat. Thread pass where design placed.
You may also like:
- Features and Uses of the Raschel Warp Knitting Machine
- Difference between Raschel and Tricot Warp Knitting Machine
- Plating Techniques in Flat Knitting Machine
- Knitting Elements of Tricot Warp Knitting Machine
Founder & Editor of Textile Learner. He is a Textile Consultant, Blogger & Entrepreneur. Mr. Kiron is working as a textile consultant in several local and international companies. He is also a contributor of Wikipedia.
