Assignment

assignment 201-23-5784

assignment 201-23-5784

by niloy das -
Number of replies: 0

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.