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Crease Recovery Test of Fabrics

What is Crease?

Crease is a fold or wrinkle in the fabric which is introduced unintentionally at some stages of processing. Crushing or crease of textile is a completely complex effect which involves compression, torsion, compression, etc. Crease Recovery is a basic property of cotton fabrics which show the ability of the fabrics to get back to its original position after it gets creased.

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Theory of Crease Recovery

recovery is a process of measuring the crease resistance and can be specified in terms of crease recovery angle. To measure the crease recovery of the fabrics, the widely used instrument is crease recovery tester. The instrument comprises a circular disc which is duly fitted with the clamp for holding the specimens. In the center of the circular disc, there is a knife and index line that helps to measure the recovery angle easily. If the measuring angle is zero degree then it means that the recovery of the fabric is zero and of the pointer edge stops at 180 degree, the angle of recovery is 100% and so on. The crease recovery strength of the fabrics depends on the manufacturing procedure of yarn, a number of twists in fabric, pressure & time utilized in manufacturing, etc. Generally, the crease recovery is 100% when the fabric is designed more in warp direction instead of in weft direction. That is why the warp yarns are considered as best in terms of strength, quality, sizing, etc. whenever kept in tension mode during weaving, etc.

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Standardization of Crease Recovery

The testing instrument is designed as per the standards that are introduced by various standardization authorities such as ASTM, BI, IS, etc. Some of the standard test methods according to which the instrument is designed, and that helps to assure the exactness of the test results are mentioned below:

  • IS 4681 – 1968: Standard method to decide the recovery strength of wrinkles in fabric (By means of Measurement of Crease Recovery Angle)
  • BS 3086 – 1972: Standard test method to determine the recovery strength of wrinkles in fabric using Crease Recovery Angle Method
  • ASTM D 1295 – 1967: Wrinkle Recovery of Woolen Textile Fabrics using the Vertical Strip apparatus

Crease Recovery tester helps to measure the property of textile products to recover the creases using recovery angle measurement methodology.  Crease recovery tester is a calibrated device which is designed using the high-quality material. To perform the test, the sample is first of all creased sample is pressed under specific load for a period of time and is then transferred to the testing device to measure its recovery strength. During the test, one end of the sample is attached to a spring-loaded clamp, and another end is left to fall free on its own weight. Now the angle of crease recovery can be easily determined from the scale from fixed position to moving position to check out the deflection in the clamped end from the horizontal angle. 

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Features of Crease Recovery Tester:

  • Designed on heavy cast base with all parts in Stainless steel material.
  • The rotating cylindrical disc is designed with imported acrylic sheet.
  • Movement of the disc is quite smooth.
  • The base has both the Steel Creasing Load and two Round Steel Plates for pressing the specimen.
  • It is used to determine crease (Crease is a fold in fabric introduced unintentionally at some stages of processing) recovery as a measure of crease resistance.

 

Specifications of Crease Recovery Tester: 

  • Scale Range: 20- 180.
  • The size of the test sample: 50 & 25 mm and 40 x 15 mm.
  • Angle Measurement: On a circular disc which is graduated with 1 degree.
  • Creasing Load: 10N and 9.63N (10N + 9.63N = 19.63) as per ISO 500 gms and AATCC standard No. 66 respectively. 

Working Procedure of Crease Recovery Tester 

To perform the test with crease recovery tester, perform the following steps:

  • Take 12 sample of size 50 x 25mm six nos. with long dimensions parallel to warp directions of fabric and six with long dimensions parallel to weft direction of the fabric.
  • Bring both ends of the sample together.
  • Place the sample below the weight assembly to crease the sample for 60 seconds.
  • Take out the sample from the weight assembly.
  • Clip one end of the sample with a spring-loaded clamp and other is allowed to fall free under its own weight.
  • Open the locking pin to rotate the disc.
  • Rotate the disc in a clockwise direction until the free falling end of the sample comes parallel to the vertical arm.
  • Measure the angle of recovery from the circular measurement scale after 5 min of inserting the sample into sample jaw.

Calculation of Crease Recovery Angle

Calculate the average crease recovery angle in degrees for each group of 6 samples for weft and warp.

For more information on Crease Recovery testers, click here.


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