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Carding Process

In: Other Topics

Submitted By yvette12052665
Words 514
Pages 3
Name: Lau Siu Kit Buzz
Student id: 12052787d
Carding Process
a) List the objectives of carding process
b) With the aid of sketches, explain how the objectives would be fulfilled by a carding unit
c) Compare the differences among cooton card, worsted card and woollen card

a) i) To further open fibre tufts into individual state ii) To extract bits of leaf, fine particles, neps and short fibres enclosed by the fibre aggregates iii) To form the controlled , cleaned and disintegrated fibres into a rope form - sliver for feeding the next subsequent process

b) For objective (i),

Before feeding to the mian carding zone, fleece is fed to the taken-in system for slightly opening. Taken-in system is a few pairs of roller and these rollers are full of saw-touth card wires. These rollers cooperate with the fixed card wires on flat to pre-opening the fibre tufts and even the web entering main carding zone.

After fed to the taken-in system, the web is fed into the main carding zone which is formed by revolving flats and cylinder. Boths of them are full of saw-touth card wires and the card wires are oppositely directed. To complete the carding action, revolving flats and the cylinder should move in the opposite direction or in the same direction but cylinder should move faster than the revolving flats. A wide cylinder should be used because it can provide a lengthy path with the revolving flats for carding. And it can gradually reduce the tuft size. After this action, the fibres are drawn apart, separated and aligned.

For objective (ii),

In the taken-in system, some fixed mote knifes are installed to remove trash by ramming. And the mote knifes are followed by a suction to remove trash immediately.

A front plate is installed beside the cylinder at the end of the carding zone. It eliminates trash ,neps and dust by centrifugal farce and suction.

For objective (iii),

A chute feed is installed at the begining of carding machine. Fleece thickness is controlled by the speed of the feed roller. It provide uniform feed to carding machine and the sliver can be more even. The feed roller speed is contralled by the levelling system. At the end of the carding machine, trumpet measures the thickness of sliver and send the data to the control to compare with the past data. If the sliver is thicker than the past, control will send a signal to the feed roller to reduce the speed. It is a preventive action to eliminate the long term variation.

A curved plate with central aperture threads the web into sliver trumpet. And the calendaring roller for pressing the sliver to increase fibre cohesion.

c) Differences between cotton card, woollen card and worsted card are followed:

| Cotton card | Woollen card | Worsted card | No. of cylinders | 1 | 4-5 | 2 | Carding action by | Revolving Flats | Workers | Workers | Card wire | Taken-in;cylinder;doffer | All flexibleexcept taken-in roller | All flexibleexcept taken-in roller | Output | Sliver | Roving | Sliver | Intermediate feeding | No | Yes | No |

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