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ENKA Standard Prüfvorschrift Nr. 3061 3/1977

Determination of Crease Recovery in Textile Fabrics (Cylinder Method)

1 Scope Woven and knitted fabrics used in outerwear as well as other textile products. 2. Apparatus Crease tester, Lako und Veer system Disc-type weights, 0.5 or 4.0 kg Air-conditioned chamber (for testing in specified atmospheres) Table and light Rating standards 3. Test conditions Crease recovery can be determined under different sets of atmospheric and testing conditions.

A. Testing in standard atmosphere (20°/65% RH) atmosphere 20° C ± 2° C, 65 % RH ± 3 % RH conditioning 24 h crease weight 4 kg loading time 20 min

B. Testing under special atmospheric conditions (35° C /85% RH) atmosphere 35° C ± 2° C, 85 % RH ± 3 % RH conditioning 1 h crease weight 0.5 kg loading time 10 min 4. Preparation of test specimens Rectangular test specimens measuring 145 mm x 300 mm are cut from the fabric sample in both directions and conditioned as specified above. For testing according to method 3061B the specimens are conditioned in an air-conditioned chamber. For this purpose the specimens are mounted as described under item 5 below and placed into the chamber while mounted in this cylindrical starting condition. 5. Experimental After proper conditioning the test specimen is mounted - face side up - cylindrically around the discs of the tester while these are in their starting position. Then the upper disc is spiraled downward, thereby distorting the specimen by 180° and subjecting it to a certain amount of compression. Now the appropriate weight is placed onto the discs and the specimen so compressed is left for the specified time. Then the weight is removed and the upper disc is returned into its initial position. The specimen is removed from the tester and visually assessed for crease formation Then the specimen is freely suspended from its shorter edge for crease recovery in standard atmosphere. 6. Evaluation Crease recovery is visually assessed in relation to an 8 note standard on the table. For an overall rating of crease recovery the assessment is repeated after different recovery periods: e .g. CR0 - immediately after removal from tester

CR1- after 1 hour CR2 - after 2 hours CR24 - after 24 hours

7. Sample size At least 2 tests should be carried out on specimens cut in each fabric direction.

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