Question

Compared to Single yarn, in Double or folded yarns the Uniformity will

• A. Reduce
• B. Improve
• C. Not be altered
• D. Be less than standard

Hint:

Remember the advantages of folded (double) yarns: \[ \begin{aligned} &\bullet\ \text{Higher Strength} &\bullet\ \textbf{Better Uniformity} &\bullet\ \text{Reduced Hairiness} &\bullet\ \text{Better Appearance} &\bullet\ \text{Improved Abrasion Resistance} \end{aligned} \] A simple memory trick is: \[ \boxed{ \text{Folding} \Longrightarrow \text{Better Evenness} \Longrightarrow \text{Improved Uniformity} } \] This is one of the frequently asked objective questions in spinning technology and textile engineering examinations.

Answer 1

The Correct Option is B

Concept: A single yarn is produced by twisting fibres together into a single strand. On the other hand, a double (folded) yarn is produced by twisting two or more single yarns together in the opposite direction. Folding improves the overall quality of the yarn by balancing irregularities present in the individual single yarns. The important advantages of folded yarns are:
• Improved uniformity,
• Higher strength,
• Better abrasion resistance,
• Reduced hairiness,
• Better appearance,
• Improved dimensional stability. Hence, folded yarns are preferred wherever better yarn quality and consistency are required.

Step 1: Understand the structure of folded yarn.
A folded yarn consists of two or more single yarns twisted together. If one component yarn contains a slightly thick or thin place, the corresponding portion of the other yarn may compensate for it. Thus, the irregularities of individual yarns tend to average out. This results in \[ \boxed{\text{Better yarn evenness and improved uniformity.}} \]

Step 2: Compare single yarn and folded yarn.
The comparison is given below: \[ \begin{array}{|c|c|c|} \hline Property & Single Yarn & Folded Yarn \hline Uniformity & Moderate & Improved \hline Strength & Lower & Higher \hline Hairiness & More & Less \hline Abrasion Resistance & Lower & Better \hline Appearance & Less Uniform & More Uniform \hline \end{array} \] From the comparison, it is clear that folded yarn possesses better uniformity than single yarn.

Step 3: Examine each option.
Option (A): Reduce Uniformity does not reduce after folding. \[ \boxed{\text{Incorrect}} \] Option (B): Improve Since the irregularities of individual yarns compensate each other, folded yarns exhibit improved uniformity. \[ \boxed{\text{Correct}} \] Option (C): Not be altered Uniformity definitely changes and becomes better after folding. \[ \boxed{\text{Incorrect}} \] Option (D): Be less than standard This statement is not correct for folded yarns. \[ \boxed{\text{Incorrect}} \]

Step 4: Write the final answer.
Compared to a single yarn, a double or folded yarn possesses \[ \boxed{\text{Improved Uniformity}.} \] Therefore, \[ \boxed{\text{Option (B) is the correct answer.}} \]