Stretch Recoverability of Fabric

Fabric stretch recovery is calculated as the percentage of the fabric growth recovered with respect to the fabric growth determined after tension or after a specified extension obtained at the various intervals. Fabric with good tensile or elastic properties will shrink itself after spreading and will be difficult to deal with in cutting, sewing, ironing, and other operations. Because of the product drawing, the size changed and the stitching part of the corrugated shape, if the stitching direction of the tension is too large, the sewing is easy to break or shrink the thread. Therefore, when operating for the above-mentioned fabric, we should choose the suitable elastic sutures for tensile properties.

Knitted fabric stretch recovery tester, used to determine the tensile properties of the fabric in a certain tension and tensile range.

Sample Preparation

Cut five samples along the length direction and width direction, which size is (125±3)mm*(500±10)mm. Ensure the specimens are free of folds, creases, or wrinkles. Avoid getting oil, water, grease, etc. on the specimens when handling.

The specimen is semi-folded into a ring, suture from the edge of the sample at 6~13mm which parallel to the short edge. Place the sample on the plane and set a mark A at the center of one side of the annular specimen. Humidification the sample according to ASTM D 1776 standard.

Test Procedure

1 Slide the specimen loop over the upper hanger rod and secure the rod in the hanger. Slide the folded end of the loop over the lower hanger rod and secure the rod to the hanger.

2 Place the upper hanger in the slot in the top bar of the supporting frame. Insert the dowel pin into the upper step marking the center on the fabric surface and connect to the sample ring.

3 Attach the chain by means of the turnbuckle to the lower hanger and extend the specimen loop to the amount specified, that is, such that the lower benchmarks line up with the specified percentage stretch point on the scale.

4 Lock the chain in the corresponding notch in the lower cross member of the frame. Adjust the turnbuckle to make minor adjustments to the position of the lower benchmark.

5 Waiting for a period of time as required, unlock and release the chain and remove the lower hanger from the specimen loop.

6 Measure the position of the lower benchmark relative to the scale on the rule to the nearest 1% or 1mm of the original gauge length.

Report Content

Sampling specifications and sampling methods. The original size between the marking points.

After 60 seconds of recovery, each fabric elongation and average elongation of the fabric. After 2 hours of recovery, each fabric elongation and the average elongation of the fabric.

Percentage of fabric elongation. The tension at which the fabric is stretched.