Effect of Inter-fibre friction:
Fibers are held in yarn by inter-fibre frictional contact. The quality of Force 'F'will depend on both pressure and area of contact.
- Inter fibre frictional forces plays secondary role in preparatory process such as sliver, rove stage and plays important role at final stage.
- Fibre treatment with PEG increases the co-efficient of dynamic friction and decreases the static frictional co-efficient.
Role of aprons:
- In a R/F drafting system to avoid formation of drafting wave the fibres should accelerate at the same speed of rollers only when they gripped by it.
- The control over floating fibres is affected by set of aprons.
- One of the causes of irregularity in the drafted strand is dragging of un-drafted strand into the nip of front roller due to increase in drafting force.
- It is possible that drafting wave can be avoided if frictional resistance between the fast moving fibre and the floating fibre is maintained less than combined force of frictional resistance between the floating fibre and slow moving back fibre and the frictional resistance between floating fibres & aprons.
The author is Senior Manager (Process control) at Inarco Limited
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