Sequence of Combing Operation
Md. Rubel Miah
Department of Textile engineering
World University of Bangladesh
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.
- 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.
- To remove neps and impurities.
- To produce uniform sliver of required wt/unit length.
- To make the fibre straight and parallel so that yarn become even and lustrous.
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|
|Fig: Lap nipping by nipper|
|Fig: Combing by cylinder|
|Fig: Nipper opening & forwarding|
|Fig: Detaching roller backward movement|
|Fig: Piecing of web|
|Fig: Combing by top comb|
|Fig: Detaching roller forward movement|
|Fig: Preparation for next combing cycle|
|Fig: Waste extraction by the brush|