International Journal of Engineering Inventions

Defects and causes in combing

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Analysis on the Defects in Yarn Manufacturing Process

5.4.5.2 Preventive action for Number of piecing in comber
5.5 Roving frame section

5.4.4 Defects and causes in combing

Lap wt. variation

Number of piecing in comber

Brush cleaning problem
5.4.5 Preventive action

5.4.5.1 Preventive action for lap licking
This fault is due to raw material properties such as micronaire, if micronaire value is less than 3.8 then lap
lacking tendency will be more. Preventive action for such problem, it is necessary to concentrate on total draft
between card and comber. This draft should be as low as possible that should be around 8.5.
5.4.5.2 Preventive action for Number of piecing in comber
Piecing is a periodic variation. The amplitude of this fault should be as low as possible. Following affects this
fault:

Detaching roller timing.

Arranging this fault before entering to draft zone as this fault cancel each other. Now we will discuss
about preventive action according to number of piecing in comber. As number of piecing in comber
will be less then it will give us good quality of yarn.

It is necessary for supervisor that he strictly guides to the worker that how much piecing is important
regarding to improvement of quality.
5.5 Roving frame section
The input of roving frame is silver that comes from draw frame section where only parallel of comber sliver. In
roving section reduce the linear density of draw frame silver by drafting. After reducing the linear density the
silver is transfer into roving (a thin form of rope). This is first stage where twist is inserted for making a yarn in
spinning mill. The output of this section is roving which is wind on a bobbin and this is suitable for further

Analysis on the Defects in Yarn Manufacturing Process & its Prevention in Textile Industry

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Page | 59
process. Here in this section describes a clear view of roving section objectives and technical point, critical
success factor, preventive action and defects in the section.[50]
Fig. 15 Diagram of Roving frame section

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