Fiber Cleanliness | Problems Due to Unclean Fiber in Spinning

Fiber Cleanliness:
Fiber cleanliness is one of the important properties of fiber for spinning. Fiber cleanliness includes freedom from excessive fiber finish, debris, and oligomer. The cleanliness of cotton feedstock depends upon the degree of cleaning at the gin, opening, and carding. Cotton fiber ends tend to be damaged by the combing roll and at higher combing roll speeds there is fiber breakage. Cotton fiber generally mixed with …..
Unclean fiber
1. Vegetable matter:
  • Husk portions.
  • Seed fragments.
  • Stem fragments.
  • Leaf fragments.
  • Wood fragments.
2. Mineral material:
  • Earth.
  • Sand.
  • Ore dust picked up in transport.
  • Coal dust picked up in transport.
3. Other foreign matter:
  • Metal fragments.
  • Cloth fragments.
  • Packing materials (mostly polymers).
4. Fiber fragments
  • Fiber particles (which finally make up the greater portion of dust.)
Problems due to unclean fiber:
  1. Metal parts cut the fibres and harmful to spinning machine.
  2. Vegetable matters make disturbance in drafting.
  3. Vegetable matters jam the carding pin.
  4. Mineral matters decay the rolling parts of machine.
Scale of Cleanliness:

Trash (%)
Fibre Quality
Up to 1.2%
Very clean.
1.2%-2.0%
Clean.
2.0%-4.0%
Medium Clean.
4.0%-7.0%
Dirty.
7.0% above
Very Dirty.

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