Important Definitions

Carding ratio: It is ratio between the surface speed of cylinder and surface speed of worker roller.

Carding efficiency:   

[(Surface speed of cylinder – surface speed of worker roller)/Surface speed of cylinder]x 100

 

Card pinning: the process by which pins are set on different rollers in the card.

Clock length: the length of the feed material which is fed per one revolution of clock pointer is called clock length.

Dollop weight: the weight of the feed that is fed per one revolution of the clock pointer is called dollop weight.




For Better understanding of the different rollers of Jute Carding Machine visit the click link below

JUTE CARDING MACHINE

Warping: definition, requirements and parts of warping machine

Warping is the parallel winding of yarn from cone or cheese package on to a warp beam.

Why warping is done.

1. To wound up fixed length of yarn to a warp beam
2. To increase the weavability of yarn
3. To make the next process dynamic
4. To increase production
5. To increase the quality of fabric
6. To make small package reusable
7. To make a convenient yarn sheet for sizing

Requirements of Warping

1. The tension of the wound ends must be uniform and constant during all times of withdrawal from supply package
2. Warping should not impair the physical and mechanical properties of yarn
3. The tension should be moderate to enable the yarn to retain its elastic property completely
4. Predetermined length of the yarn should be observed
5. The production rate of warping should be high
6. The surface of warping package must be cylindrical

Components of a Warping Machine

The warping machine is mainly divided into two major components

1. Creel
2. Headstock

Components of creel

1. yarn clearer
2. stop device
3. indicator
4. tensioners
5. yarn guide
6. package base
7. blower or suction fan

Components of Headstock

1. adjustable V-wraith
2. measuring and marking device
3. yarn speed controlling device
4. pneumatic or hydraulic pressure unit
5. break assembly
6. driving drum
7. stop motion
8. building drum
9. beam bracket
10. lease  rod

Jute Carding Machines

Types of carding machines according to cylinder direction.

1. Up striking: In this card the material moves over the cylinder

2. Down striking: In this card the material moves under the cylinder

Types of carding machines according to path of jute.

1. Half Circular: Here the jute travels half the circle of the cylinder.

2. Full Circular: Here the jute travels the entire circle of the cylinder.

Breaker Card

Principle of Breaker Card:  It is a down striking and half circular carding machine. Its feed is at one side of the machine and delivery is on the opposite side.

Working regions:

• Combing action occurs between stripper and worker roller.
• Carding action occurs between cylinder and worker roller.
• Opening spreading ocurrs between shell and pin feed roller.

Speed of rollers:

Cylinder: 2400 – 2700 feet per minute

Feed roller: 9 – 14 feet per minutes

Worker: 35 – 50 feet per minutes

Stripper: 300 – 500 feet per minutes

Doffer: 75 – 95 feet per minutes

Delivery roller: 150 – 200 feet per minutes

Finisher Card

Principle of Breaker Card:  It is a down striking and full circular carding machine. Its feed and delivery is on the same side of the machine.

Working regions:

• Combing action occurs between stripper and worker roller.
• Carding action occurs between cylinder and worker roller.
• Opening spreading occurs between cylinder and pin feed roller. 

Speed of rollers:

Cylinder: 2400 – 2800 feet per minute

Feed roller: 10 – 15 feet per minutes

Worker: 30 – 40 feet per minutes

Stripper: 300 – 500 feet per minutes

Doffer: 75 – 100 feet per minutes

Delivery roller: 150 – 200 feet per minutes