Question

The primary functions of spin finish are
A. lubrication of fibre surface
B. setting of filaments
C. antistatic action
D. cohesion of filaments Choose the correct answer from the options given below :

• A. A, B, C only
• B. B, C, D only
• C. A, C, D only
• D. A, B, D only

Hint:

Spin finish is like "conditioner" for synthetic hair. It stops the static, keeps the strands together, and makes them slippery enough to glide through machines.

Answer 1

The Correct Option is C

Concept: Spin finish is an oil-based chemical coating applied to synthetic fibers immediately after melt spinning. It is essential for the smooth downstream processing of the filaments.

Step 1: Surface Control and Friction.
Synthetic fibers are naturally smooth and can generate high friction when passing over metal guides. The spin finish provides A (Lubrication of fibre surface) to reduce this friction and prevent fiber damage.

Step 2: Managing Static and Integrity.
Synthetic polymers are excellent insulators and prone to building up static electricity. Spin finishes contain agents for C (Antistatic action) to prevent fibers from repelling each other. Additionally, it provides D (Cohesion of filaments), helping the individual filaments stay together as a single yarn bundle rather than fraying apart.

Step 3: Exclusion.
B (Setting of filaments) is typically achieved through thermal processes like heat setting or drawing, rather than the chemical application of a spin finish.