Monday, June 5, 2017

Spin Finishes for Man Made Fiber

Spin finish:
Spin finishes are the lubricant which provides surface lubricating, plasticizing and static protection to manufactured fiber. It is applied in fluid condition just before wind up. Spin finishes are very essential for man-made fibers for efficient processability and conversion to textile materials for different applications. It is a layer on fiber which can thick molecules on surface of the fiber.
 
Spin finishes on fiber
Fig: Spin finishes on fiber
Objects of spin finishes for synthetic fibers:
  • To lubricate yarn.
  • To reduce static electricity.
  • To increase the cohesion of the yarn.
  • To plasticize the fiber.
  • To keep law volatility
  • To reduce yellowing
  • To keep thermal stability
  • Helps to handle variation, i.e. slick, soft, scoop all controlled by choice of lubricant
Different type of spin finishes on manufactured fiber:

I) Lubricants: Used to control the friction of the fiber.

Example: Oils, polyglycols, ester of fatty acid.

II) Plasticizers: Plasticizers make the fiber more flexible by reducing the glass transition temp and also reduce brittleness.

Example: Dibutyl, Silicate esters, Silicate.

III) Antistatic agents: Antistatic agents are hygroscopic chemicals which can conduct the static charge from fibre to air or earth to improve dielectric const and to reduce co-efficient of friction.

Example:
  • Inorganic salt (such as lithium chloride)
  • Ester of fatty acid (Butyl stearate)
  • Alcohols, amide (NN-dihydroxy ethyl stearamide)
  • Poly oxyethylene derivatives etc.
Properties/ Requirements of spin finishing:
  1. To lubricate the filament for controlling the friction.
  2. It should have anti static properly.
  3. It must be provided with cohesiveness to the filament.
  4. It should not be oxidized in the air.
  5. It should give stable emulsion.
  6. It should not be carcinogenic.
  7. It should have good wetting property.
  8. It should be non- toxic.
  9. It should be cheap and easily available.
  10. It should not affect dyeing or finishing process.
  11. It should be chemically inert.
  12. It should not object able color or odor.