NAME:NILOY DAS
ID:201-23-5784
Difference between Raschel and Tricot Warp Knitting machine:
Tricot warp knitting
machine
|
Raschel warp knitting
machine
|
1. In the
past, bearded needle was used but now a days compound needle used
|
1. Rachel
m/c used latch needle together with a wire or blade
|
2. M/C
gauge expressed in needle per inch
|
2. M/C
gauge expressed in needle/inch
|
3. Three
links per course
|
3. 2 links
per course
|
4. Function
of sinker is holding down, knocking and supporting the fabric
|
4. Sinker
performs the function of holding down the loops whilst the needle rise
|
5. The
sinker are joined to each other at the front and back
|
5. The
sinker are not joined together by a lead across their ends nearest to the
needle bar
|
6. The
warp beams are accommodated in an inclined arc towards the back of the m/c
there
|
6. The
warp beams are arranged above the needle bar centered over the rocker shaft
|
7. The
warp sheets pass over the top of the guide bar rocker shaft to their tension
|
7. The
warp sheets pass down the guide bar
|
8. Mechanical
attention is carried out at the front of the m/c
|
8. Mechanical
attention is carried out at the back of the m/c
|
9. The
guide bars are numbered from the back towards the front of the m/c
|
9. The
guide bars are numbered from front of the m/c
|
10.
High speed production
|
10.
Low speed production
|
Difference between flat bed and circular knitting
machine
Flat Bed Knitting
Again as the name infers, flat bed are
horizontal needle beds where the yarn is moved across the vee shaped needle bed
within feeders. Flatbed machines have much lower output than Circular machines
and are best suited to fully fashioned garments.
There are 2 types of global flatbed
production, Handflat machines and Computer Jacquard machines
Circular knitting
machine
Circular,
as the name infers, is knitting in the round. Here the yarn fed directly [up to
32 separate yarns] into the needle bed that spins around in one direction and
creates a tube on fabric through the centre. The knitting action is very gentle,
however because the knitting is spinning in one direction, there is a chance of
‘spirality’ occurring in the knitted tube. This is when a slight twist that can
develop in the actual fabric construction during the knitting. It becomes a
problem when the fabric is laid up and cut, causing the garments being ‘off
grain’. The usual cause of spirality is cheaper ‘single twist’ yarn which is
unbalanced.