Carding
| Action Zone In Card Frame
Ahmed Saber Shravan
Lecturer, Department of Textile Engineering, Primeasia University; Bangladesh
Carding may be defined as the
reduction or attenuating of the entangled mass of fibres to a filmy web by
working between two closely spaced, relatively moving surface clothed with
sharp wire points. The carding is the heart of the spinning mill & well
carded is half-spun-demonstrate the immense significance of carding for the
final result of the spinning operation. The importance of carding is still
greater where new spinning systems are concerned.
Action Zone In Card Frame
In carding machine fibres are
tested in different zone with respect to behaviour to fibres. The action
zone of carding machine is listed below:
1. COMBING ACTION: FEED ROLLER AND
TAKER-IN ZONE
The main task of this zone is
opening of compact and large fibre package to micro tufts. In this zone,
fibre mass (chute feed mat) is held by feed roller is opened by taker-in
wire. It is a combination action of nipping of feed roller to point-of-tooth
taker-in.
Technological
Feature of Feed Roller-Taker-In Zone:
1. Type
of action: Combing
2. Rotational
direction of feed roller and taker-in is opposite.
3. Wire
direction of feed roller and taker-in is same (face to back).
4. The
material undergoes combing action.
5. Ratio
of surface speed of taker-in is considerably higher than feed roller.
6. Distance
setting ranges 20-30 thou. (1 thou = 0.001 inch)
2. STRIPPING ACTION: TAKER-IN AND
CYLINDER ZONE
The main task of this zone is to
transfer or stripping of the fibers to the cylinder. In this zone, fiber mass
(microtuflets and individual fiber) is held on the taker-in clothing is take-up
by the cylinder wire by the action of back of tooth (taker-in) to point of
tooth (cylinder).
Technological
Feature of Taker-In-Cylinder Zone:
1. Type
of action: Stripping
2. Rotational
direction of taker-in and cylinder is same.
3. Wire
direction of taker-in and cylinder is same (face to back).
4. The
material undergoes stripping action.
5. Ratio
of surface speed of cylinder is considerably higher than taker-in.
6. Distance
setting ranges 7-8 thou. (1 thou = 0.001 inch)
3. CARDING ACTION: CYLINDER AND FLAT
ZONE
The main task of this zone is
opening to individual fibres. In this zone, fibre mass (microtuflets and
individual fibre) is held on the cylinder clothing is transported by the
cylinder into the zone of revolving flats. Here, fibres are individualised by
the action of point of tooth (cylinder) to point of tooth (flat).
Technological
Feature of Cylinder-Flat Zone:
1. Type
of action: Carding
2. Rotational
direction of cylinder and flat is opposite.
3. Wire
direction of cylinder and flat is opposite (face to face).
4. The
material undergoes carding action.
5. Ratio
of surface speed of cylinder is considerably higher than flat.
6. Distance
setting ranges 8-12 thou. (1 thou = 0.001 inch)
4. DOFFING ACTION: CYLINDER AND
DOFFER ZONE
The main task of this zone is to
collection of individual fibres from cylinder surface. In this zone,
fibre mass of individual fibre lying on the cylinder clothing surface
known as cylinder web comes into contact with the doffer clothing. The transfer
of fibre from cylinder to doffer is done by the action of point of tooth
(cylinder) to point of tooth (doffer).
Technological
Feature of Cylinder-Doffer Zone:
1. Type
of action: Doffing
2. Rotational
direction of cylinder and doffer is same.
3. Wire
direction of cylinder and doffer is opposite (face to face).
4. The
material undergoes doffing action.
5. Ratio
of surface speed of cylinder is considerably higher than doffer.
6. Distance setting ranges 4-7 thou. (1 thou = 0.001 inch)
Author: Ahmed Saber Shravan Department of Textile Engineering, Primeasia University; Bangladesh
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