Question

In the drafting system of a ring frame, the break draft is applied between \(\underline{\hspace{2cm}}\)

• A. Middle and front rollers
• B. Front roller and spindle
• C. Back and middle rollers
• D. Cool and back roller

Hint:

Visualize the 3-roller drafting system: - **(Back Roller)** \(\rightarrow\) Break Draft Zone \(\rightarrow\) **(Middle Roller)** \(\rightarrow\) Main Draft Zone \(\rightarrow\) **(Front Roller)** - The Break Draft happens first, in the Back zone.

Answer 1

The Correct Option is C

Step 1: Understand a ring frame drafting system. A modern ring frame uses a 3-over-3 drafting system with aprons. It has three pairs of rollers: back, middle, and front. The rollers rotate at progressively faster surface speeds from back to front to attenuate (draft) the roving. 
 

Step 2: Define the drafting zones. The total draft is divided into two zones: 

- Main Draft Zone: This is between the middle rollers and the fast-moving front rollers. This is where the majority of the drafting takes place, controlled by aprons. 

- Break Draft Zone (or Back Zone Draft): This is between the slow-moving back rollers and the slightly faster middle rollers. A small amount of draft, called the break draft, is applied here.

Step 3: Analyze the purpose of the break draft. The break draft's purpose is to prepare the roving for the main draft. It slightly straightens the fibers and breaks any weak points or remaining cohesion from the roving twist, allowing the main draft to proceed smoothly and evenly. 

Conclusion: The break draft is applied in the back zone, which is the zone between the back and middle rollers.