Question

The force exerted by the reed on the cloth-fell at the instant of beat-up (weaving resistance) depends on

• A. Free length of warp yarn
• B. Elastic modulus of loom-state fabric
• C. Elastic modulus of warp yarn
• D. Elastic modulus of weft yarn

Hint:

Weaving resistance is primarily a function of warp tension, free length, and stiffness of the fabric structure, not the weft yarn elasticity.

Answer 1

The Correct Option is A, B, C

At the instant of beat-up, the reed exerts a force on the cloth-fell to push the inserted weft yarn into position. This weaving resistance depends on multiple factors:
Step 1: Free length of warp yarn (A).
The free length of the warp between the reed and cloth-fell influences yarn tension and hence determines the resistance offered at beat-up. Longer free length reduces resistance, while shorter length increases it.
Step 2: Elastic modulus of loom-state fabric (B).
The modulus of the woven structure at loom state dictates how stiff the fabric is against further compaction. A stiffer fabric resists beat-up more strongly.
Step 3: Elastic modulus of warp yarn (C).
Since the warp yarns are under tension, their stiffness (elastic modulus) directly impacts how much force is required to push the weft at beat-up. Stiffer warp yarns increase resistance.
Step 4: Elastic modulus of weft yarn (D).
The elasticity of weft yarn does not significantly affect the beat-up resistance because the weft is being positioned, not resisting tension in the same manner as warp. Hence, (D) is not correct.
Correct inference: Weaving resistance depends on (A), (B), and (C).