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Yarn Manufacturing Technology-II

Combing

Combing

DISADVANTAGES1. The cost of additional expenditure on man;2. The cost of additional expenditure on

machines:3. The cost of additional expenditure on material

due to loss of material as noil;4. The cost of additional expenditure on power

cost;4. The cost of additional expenditure on floor

space;Yarn production costs are higher about USD 0.3 per kg than

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Department of Yarn Manufacturing

Combing

Fibograph:

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Department of Yarn Manufacturing

Combing

Fibogram:

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Department of Yarn Maufacturing

Combing

Fibograph:

STAPLE DIAGRAM: a, cotton before combing; b, cotton after combing; c, noil

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STAPLE DIAGRAM: STATISTICS

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Effect of different combing noils%on different quality parameter

A, improvement of yarn quality in %; B, noil elimination in %; a, yarn strength; b, yarn evenness; c, yarn imperfections;

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SEQUENCE OF COMBING OPERATION

SEQUENCE OF COMBING OPERATION

a) Lap Feeding by Feed roller.b) Nipping by the top Nipper.c) Combing by Cylinder comb.d) Forwarding of bottom Nipper.e) Web returning by detaching roller. f) Web piecing.g) Combing by top comb.h) Delivery by detaching roller.i) Top comb withdrawn.j) Waste extraction by brush roller.

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TYPE OF FEED:

1. FORWARD FEED: Forward feed implies that feeding of the sheet into the nippers occurs

while the nippers are moved toward the detaching rollers. Simply, FORWARD FEED FOR FORWARD OF NIPPERS.

Forward feed is selected for the higher production rates the lower quality grades requirements.

2. BACKWARD FEED:Backward feed implies that feeding of the sheet into the nippers occurs

during return/backward of the nippers. Simply, BACKWARD FEED FOR BACKWARD OF NIPPERS.

Backward feed is selected for the higher quality grades requirements.

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TYPE OF FEED: FORWARD FEED

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DEGREES OF COMBING

1. Scratch combing: Where up to 5% noil is removed.

2. Half-combing: Where around 9% noil is removed.

3. Ordinary combing: Where around 10% to 18% noil is removed.

4. Full combing: Where greater than 18% noil is removed.

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Parameter that affects Noil%

• The feed amount moved per cycle:• The type of feed: Forward feed or backward feed;

• The detachment setting;• The point density on comber;• The depth of top comb penetration:• Fiber length distribution in comber lap• Count of comber lap• Type of Hook Present in comber lap

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Backward Feed

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Forward Feed

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