Question

In Spinning Triangle the height is ZERO, it indicates

• A. False Twist
• B. True Twist
• C. Twist contraction
• D. Residual Twist

Hint:

Zero spinning triangle height indicates complete and immediate twist insertion in ring spinning, known as true twist formation.

Answer 1

The Correct Option is B

Concept: In ring spinning, the spinning triangle is the region formed between the front rollers and the point where twist is fully inserted into the fibres. This triangle represents the zone where fibres are still relatively loose and not fully bound by twist. The height of the spinning triangle indicates the extent of untwisted fibre length. A larger triangle means more fibres are uncontrolled, while a reduced or zero-height triangle indicates complete and effective twist insertion.

Step 1: Understand spinning triangle concept.
The spinning triangle exists due to the difference in fibre tension and twist insertion point. \[ \text{Spinning triangle} \Rightarrow \text{Untwisted fibre zone} \]

Step 2: Analyze meaning of ZERO height.
If the height of the spinning triangle becomes zero, it means:
• No loose fibre zone exists
• Twist is inserted immediately at delivery point
• Fibres are fully bound without delay \[ \text{Zero triangle height} \Rightarrow \text{Complete twist formation} \]

Step 3: Relate to type of twist.
When twist is fully and properly inserted into the fibre strand without any loose zone, it is called: \[ True Twist \]

Step 4: Evaluate options.
Option (A): False Twist
Twist that is temporary or unstable, not related to spinning triangle disappearance. Option (B): True Twist
Represents complete and stable twist insertion → correct. Option (C): Twist contraction
Refers to yarn shortening, not triangle geometry. Option (D): Residual Twist
Remaining twist after tension release, not relevant here.

Step 5: Final answer.
Thus, when spinning triangle height is zero: \[ \boxed{\text{True Twist}} \] Therefore, \[ \boxed{\text{Option (B) is the correct answer.}} \]