Question

Spirality in weft knit can be assessed by

• A. Photo copy method
• B. Heat set method
• C. Wash burns method
• D. Star fish method

Hint:

Spirality increases with yarn torque imbalance and relaxation shrinkage.

Answer 1

The Correct Option is A

Concept: Spirality in weft knitted fabrics is the angular displacement of courses from the horizontal axis after relaxation or washing. It occurs due to residual torque in yarns, causing fabric distortion. To measure this distortion accurately, a visual and dimensional comparison method is required.

Step 1: Understand spirality formation.
Spirality is caused due to:
• Yarn twist imbalance
• Loop relaxation after knitting
• Unequal torque distribution

Step 2: Need for measurement method.
A proper method must:
• Capture loop distortion clearly
• Allow angular measurement
• Work after fabric relaxation

Step 3: Evaluate methods.

• Photocopy method → gives exact outline of fabric distortion
• Heat set method → used for stabilization, not measurement
• Wash burns method → not standard for spirality
• Star fish method → unrelated

Step 4: Final identification.
Photocopy method is widely accepted for spirality measurement. \[ \boxed{\text{Photocopy Method}} \] Thus, \[ \boxed{\text{Option (A) is correct.}} \]