Question

In the spinning process, a precisely predetermined quantity of short fibers are eliminated in \(\underline{\hspace{2cm}}\).

• A. Comber
• B. Draw frame
• C. Speed frame
• D. Carding

Hint:

Remember the difference between Carded and Combed yarns: - Carded Yarn: All fibers are included (except for some waste). Standard quality. - Combed Yarn: Short fibers are intentionally and precisely removed by a Comber. Premium quality.

Answer 1

The Correct Option is A

Step 1: Understand the objective: to eliminate a "precisely predetermined quantity of short fibers." This is a selective process aimed at improving yarn quality by removing the least desirable fibers from the fiber population. 
 

Step 2: Evaluate the function of each machine regarding short fibers. 
- A. Comber: The combing process is specifically designed for this purpose. A lap of parallelized fibers is fed to the comber, where a series of fine-toothed combs pass through the fiber fringe. This action physically removes short fibers, neps, and impurities. The amount of waste removed (called "noil") can be precisely controlled by adjusting machine settings, typically ranging from 8% to 25%. Yarns made from combed cotton are finer, stronger, smoother, and more expensive. 
- B. Draw frame: The main goal is improving evenness and parallelization, not removing short fibers. 
- C. Speed frame: The main goal is drafting and inserting protective twist. It does not remove short fibers. 
- D. Carding: Carding removes some short fiber as waste ("card waste"), but its main job is individualization, and the removal is not as precise or significant as in combing. 

Conclusion: The comber is the only machine in the spinning process whose specific function is to eliminate a precisely controlled amount of short fibers.