International Journal of Engineering Inventions

Technical points in draw frame regarding to setting

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Analysis on the Defects in Yarn Manufacturing Process

5.3.3 Critical success factor
5.3.5 How Much Importance for Quality

5.3.2 Technical points in draw frame regarding to setting

If back roller setting is wider then it disturbs the yarn strength. It also affects yarn evenness and
increases imperfection (neps 200%, thick +50, thin -50).

If pressure increases in back top roller then yarn strength is decreased and breakage rate is reduced.

If front roller speed is to be keep more wider then it improve the yarn strength.

Sliver uniformity can be reduced if draft is more but fiber parallelization is improved.[48]
5.3.3 Critical success factor

Auto leveller gauge setting.

C.V% of output sliver.

Grains per yard.
5.3.4 Factor which affect the yarn quality
Following are the factors which affects the yarn quality:

Fiber length

Types of drafting

Delivery speed

Fiber fineness

Auto leveler setting

Break draft

Total draft
5.3.5 How Much Importance for Quality?
Following points are very important regarding to quality in draw frame:

For improving quality auto leveller is very necessary. Auto levellers fulfil the requirement according to
need.

Draw frame sliver test is very necessary after every ten days. A% (alarm of bad quality) should be less
than 0.8%.

1 meter C.V from uster testing machine should be less than 0.6.

For improvement in quality, top roller buffing (polishing) should be done within a month.

After every hour there should be cleaning of top roller. If cleaning will not be there then sliver variation
will be more.

10 meter sliver should be wasted when start the machine after overlapping, because if it is used in
process then C.V may be increased.

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

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Page | 57

Machine setting should be proper otherwise that back creel sliver breakage will increase. In this
condition sliver piecing will be more.

From quality point of view 10 meter sliver should be wasted.[49]

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