Objectives of carding

Objectives of carding, main actions of carding machine, Useful sliver hanks of different counts and wastage in carding

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Objectives of carding

1. To open the tuft of fibers

2. To make the fiber parallel & straight

3. To remove remaining trash particles

4. To remove short fibers

5. To remove naps

6. To produce a rove like fiber called silver, which is uniform in per unit length

Main actions of carding machine

1. Action between fee roller & taker in

2. Action between taker in and cylinder

3. Action between cylinder and flat

4. Action between cylinder and doffer

Useful sliver hanks of different counts:

Description

Counts

Count of yarns

10s

20s

32s

40s

60s

80s

Hank of carded sliver

0.125

0.125

0.13

0.135

0.145

0.165

Wastage in carding:

1. Taker in waste

2. Flat strip

3. Motes &flies

4. Sliver cut

5. Filter waste

  
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Functions of Carding
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Draw frame Functions
Carding is a mechanical process that breaks up locks and unorganised clumps of fibre and then aligns the individual fibres so that they are more or less parallel with each other. Carding can also be used to create blends of different fibres or different colours. Carding plays a crucial role in all spinning cycles particularly in the woollen spinning cycle, in which it incorporates different functions, all essential in order to obtain the level of quality required of the product.Carded Slivers are fed into the Draw-Frame and are stretched/Straightened and made in to a single sliver. Also fibre blending can be done at this stage. The cans that contain the sliver are placed along the draw-frame feeder rack, usually including eight pairs of cylinders (each pair is above the space occupied by a can),the lower cylinder is commanded positively, while the upper one rests on the lower one in order to ensure movement of the relative sliver that runs between the two.