5.3.6 Causes of draw frame sliver variation
These are the following point which affects the variation in draw frame
Break draft.
Improper handling of material.
Over filling of can with material.
Top roller overlapping.
Thick piecing of sliver when sliver is break.
Improper working of auto leveller.
5.3.7 Preventive action of Frame sliver variation
To avoid sliver variation it should be concentrated on break draft. For cotton processing break draft is
normally from 1.16 to 1.2 because if improper break draft is given, it will affect the quality of yarn in
the form of thick and thin places.
Production department supervisor should cover draw frame material with polythene sheet to avoid fine
dust otherwise it will create variation in the sliver. Fresh material is to be given to the next process, if
fresh material not use then it will create variation in the sliver.
Draw frame material is very sensitive and it must not over fill. In case it compresses the material in the
can, and it raptures the surface of sliver. So production supervisor should be strictly avoiding this.
Top roller cleaning is to be done after every 1 hour. In this way variation will be decreased in the sliver.
5.4 Combing section
Combing section is used for get high quality in yarn manufacturing process. In this section the cotton is comes
in the form of lap which is produce in lap former machine. In this section short fiber are removed from the
cotton sheet and only that fiber which have a long length are used for getting high quality yarn. The output of
combing is also in the form of sliver which is more parallel and smooth. In this section, describes of objectives,
technical point, critical success factors, preventive action and defects of section which affects the quality of
yarn.
Fig.14 Diagram of combing section
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