Stretch and Recovery Testing for Knitted Fabrics
Stretch and recovery values decide fit, opacity and shape retention, and they must be specified in both directions.
The practical guidance below is written for buyers and product developers who need a specification that a mill can meet.
Test parameters
A fixed load is applied, held, released and the residual growth measured after a defined recovery time.
It is one of the few areas where a modest investment in development removes a large volume of after-sales work.
Direction matters
Course and wale directions behave differently, so both are reported separately.
Add the value to the pre-production sample approval sheet so it is checked before bulk rather than after shipment.
- Ask for a separate price line for the requirement
- Confirm minimum quantities before committing the colourway
- Build one extra approval round into the calendar
Cycling tests
Repeating extension and relaxation cycles shows how the fabric behaves in real wear.
Log adjustments and their reasons, which turns each production run into useful data for the next one.
Acceptance values
Growth under five percent and recovery above ninety percent after ten cycles suit most sportswear programmes.
Share the results with the mill, since transparency usually shortens the path to a workable solution.
- Confirm the numeric range and the test method in the specification
- Keep an approved physical standard at the machine
- Retest after the agreed care regime before shipping
Link to garment fit
Fabric recovery predicts whether the garment grows out of shape after a few hours of wear.
Expect the cost and lead time implications to appear in sampling and capacity booking rather than in the yarn price alone.
Summary
A clear specification, a trained operator and a documented test together remove most of the risk from this part of the programme.
