ISO 2313-2:2021

Overview

ISO 2313-2:2021 - Textiles - Determination of the recovery from creasing of a folded specimen of fabric by measuring the angle of recovery - Part 2: Method of the vertically folded specimen - specifies a laboratory method to measure the crease recovery angle of fabrics when the folded line is made vertical after removal of a creasing load. The method applies to all kinds of textile fabrics and gives reproducible rapid and delay crease recovery values that indicate a fabric’s ability to recover from accidental creasing.

Key topics and technical requirements

• Principle: A folded specimen is loaded for a specified time; after removal of the load the specimen is turned so the fold is vertical and the angle between limbs is measured.
• Loading: A weight-piece applies 10.0 N ± 0.5 N over an area of 15 mm × 18 mm. Removal of load must be completed within 1 s.
• Timing and measurement:
  • Rapid crease recovery angle: read at 15 s ± 1 s after load removal.
  • Delay crease recovery angle: read at 5 min ± 5 s after load removal.
• Specimens:
  • At least 20 specimens unless agreed otherwise; half oriented in the warp/length direction and half transverse.
  • Take representative samples not less than 150 mm from the selvedge and avoid damaged areas.
• Apparatus:
  • Loading device (weight-piece, pressure board with boss, specimen holder board and clips).
  • Instrument for measuring crease recovery angle (protractor with 0.5° resolution or an automatic image-acquisition tester described in Annex A).
  • Timer and handling aids (smooth-edge holder or rubber glove).
• Atmosphere: Conditioning and testing atmosphere per ISO 139 (standard atmospheres).
• Results: Mean values calculated and rounded to one decimal place; separate results for face-to-face and back-to-back folds, and for length (warp) and transverse (weft) directions.
• Test report: Must reference ISO 2313-2:2021 and include sample ID, number of specimens, folded surface, crease direction, mean rapid/delay angles, deviations, and test date.

Applications and users

• Useful for textile manufacturers, quality control laboratories, textile R&D, garment and upholstery producers, and standards bodies.
• Practical applications:
  • Comparing fabric finishes, treatments, or blends for crease resistance.
  • Quality acceptance testing for apparel, workwear, home textiles and technical textiles where appearance after creasing matters.
  • Supporting product specifications, claims and supplier audits.

Related standards

• ISO 2313 (series) - other parts of crease recovery testing (see ISO catalogue for the series).
• ISO 139 - standard atmospheres for conditioning and testing (referenced for climate control).

Keywords: ISO 2313-2:2021, crease recovery angle, textiles, vertically folded specimen, fabric testing, crease recovery testing, ISO 139, automatic tester.