Sequence of Combing Operation

Sequence of Combing Operation

Md. Rubel Miah
Department of Textile engineering
World University of Bangladesh

Combing Operation:
The combing process is carried out in order to improve the quality of the sliver coming out of the card. The process eliminates short fibres, it achieves better parallelisation of fibres, it straightens curls, and it removes neps and residue impurities. It is clear from these functions that the combing process is essentially aimed at obtaining excellent quality yarns and to fulfill this objective raw materials with above average physical and mechanical features must be used from the very beginning of the spinning process.

  1. To remove fibres shorter tan a predetermined length so as to enable spinner to produce finer yarn than that can be spun from the same carded sliver.
  2. To remove neps and impurities.
  3. To produce uniform sliver of required wt/unit length.
  4. To make the fibre straight and parallel so that yarn become even and lustrous.
Working Principle:

1. Lap feeding by feed roller: The feed roller(A) move the sheet/Lap (B) (4 to 6.5) forward while the nipper C/D are held open (feed).
Fig: Lap feeding by feed roller
2. Lap nipping by nipper: The top nipper (C) is toward onto the bottom nipper(B). So that the fibre are clamped between them (nipper).
Fig: Lap nipping by nipper
3. Combing by cylinder: The combing segment (E) mountain on rotating cylinder(F) aweaps its needle or show teeth through the fibre & carries away anything not held by nipper.
Fig: Combing by cylinder
4. Nipper opening & forwarding: The nipper open again 7 move towards the detaching rollers(G).
Fig: Nipper opening & forwarding
5. Detaching roller backward movement: Mean while the deatching roller (G) have returing part of the previous drawn off slock by moves of a revers that the web produce as from the back of the detaching rollers.
Fig: Detaching roller backward movement
6. Piccing of web: In the course of the forward movement of the nipper the projecting fibre is place upon the returned web.
Fig: Piecing of web
7. Combimg by top comb: Before the short of the detaching operation, the top comb(H) has thrust its single raw of the needle into the fibre. As the fibre are pulled through the needle of the top comb(H) during detaching , the tailing part of the top combed.thus making up for the inablity of the cylinder combs to reach this part of the fibre & thus performs combing.
Fig: Combing by top comb
8. Detaching roller forward movement: The detaching roller being to rotate in the forward direction again and deawn the clambed fiber out of the sheet held first by the feed rollers.
Fig: Detaching roller forward movement
9. Prepartion for next combing cycle: As the nipper assumply is retracted, the nippers up for the next feeding step the top comb is withdrawn.As new combing cycle beings.
Fig: Preparation for next combing cycle
10. Waste extraction by the brush: The combing cylinder rotates continuously and the combing segment is therefor attached with same imparites and short fibre. There are a rapidly brush (I) mounted bleow the combing cylinder.Thus the impurites & attached fibre.
Fig: Waste extraction by the brush
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Mazharul Islam Kiron is a textile consultant and researcher on online business promotion. He is working with one European textile machinery company as a country agent. He is also a contributor of Wikipedia.

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