Question

The contraction percentage of 1 x 1 rib structure compared to its machine width is around

• A. 30
• B. 40
• C. 50
• D. 60

Hint:

1x1 rib fabrics have high widthwise contraction due to the alternating knit and purl stitches. Expect contractions around 50%.

Answer 1

The Correct Option is C

Step 1: Understanding Rib Structures: Rib knitted fabrics are characterized by alternating knit and purl stitches, creating vertical ribs. A 1x1 rib has one knit stitch followed by one purl stitch, repeating across the width.
Step 2: Contraction in Rib Fabrics: Rib fabrics, especially 1x1 rib, have a strong tendency to contract in width. This is because the knit and purl stitches pull the fabric inwards. The degree of contraction depends on the yarn properties, machine settings, and finishing, but it's significantly higher than plain jersey fabrics.
Step 3: Typical Contraction Percentage: A 1x1 rib structure typically contracts around 50% of its machine width. This is due to high forces caused due to loop formation.