Question

Break draft used in simplex is in the range of

• A. 1.09 - 1.12
• B. 1.2 - 1.3
• C. 1.22 - 1.29
• D. 1.1 - 1.3

Hint:

• Break draft} (or back zone draft) in a simplex/roving frame is the draft in the initial drafting zone.
• It is typically low, in the range of 1.1 to 1.4 for cotton processing.
• The range 1.2 to 1.3 is very commonly used and recommended.
• Its purpose is to provide initial fiber control and prepare for main drafting.

Answer 1

The Correct Option is B

The simplex machine (roving frame or fly frame) drafts sliver to produce roving. It typically has a multi-zone drafting system (e.g., 3-over-3 rollers). The break draft (or back zone draft) is the draft applied in the first drafting zone, between the back rollers and the middle rollers. Its purpose is to slightly attenuate the sliver, improve fiber control, and prepare it for the main draft. The break draft is generally kept low to avoid excessive fiber breakage or uncontrolled drafting. For cotton system simplex machines, typical break draft values are in the range of 1.1 to 1.4.

• Option (a) 1.09 - 1.12: This is at the lower end of the typical range.
• Option (b) 1.2 - 1.3: This is a very common and representative range for break draft in simplex.
• Option (c) 1.22 - 1.29: This is a narrower range within option (b), also very typical.
• Option (d) 1.1 - 1.3: This is a broader, generally acceptable range.

Among the given options, 1.2 - 1.3 is a widely cited typical range for break draft on a cotton roving frame. If a more specific common range is expected, this fits well. \[ \boxed{1.2 - 1.3} \]