Drawing

Drawframe

Within the sequence of m/c in cotton spinning mill, the drawframe is the definitive compensation point for elimination errors. Inadequacies in the product leaving the drawframe not only pass into the yarn, they are actually reinforced by drafting effects following the draw frame. The yarn is never better than the draw frame sliver.

At drawing stage, material passes not only one m/c but usually 2, arranged 1 after the other & combined to form a group. Processing in 2 passages is necessary completely to fulfill the requirements. The 2nd passage is often superfluous after combing m/c because then it does not normally generate any improvement in quality. In old machinery 3 drawings were used, breaker, intermediate & finisher. But now in latest m/c only 2 drawings, breaker & finisher are used & in D-35 only one drawing is used.

Object Of Drawing

• Through doubling the slivers are made even
•  Doubling results in homogenization(blending)
• Through draft fibres get parallelised
• Hooks created in the card are straightened
• Through the suction ,intensive dust removal is achieved
• Autoleveller maintains absolute sliver fineness

Task Of The Drawframe  

• Drafting
• Equalizing
• Parallelizing
• Blending
• Dust removal

Drafting Arrangement: Drafting Arrangement is the heart of the Draw frame. The Drafting Arrangement should be:-

• Simple
• Stable design with smooth running of rollers
• Able to run at higher speeds and produce high quality product
• Flexible i.e suitable to process different materials , fibre lenths and sliver hanks
• Able to have good fibre control easy to adjust