The ability of textiles to recover from creases is determined by measurement of its crease recovery angle. In this test the test specimen is first creased under a specified load for specified period of time and it then transferred to the angle measuring device where one of its ends is held in a spring loaded clamp while the other end is allowed to fall freely under its own weight. This clamped end is slowly rotated till the free end becomes vertical. The angle of deflection of the clamped end from the horizontal is read on a scale fixed to the ability of textiles to recover from creases is determined by measurement of its crease the moving clamp. This angle gives the measure of the crease recovery.
The INNOLAB Crease Recovery Tester for fabrics consists of an arrangement to crease a rectangular test specimen under a specified load for the specified duration of time and an arrangement to measure the crease recovery angle. Creasing is carried out by pressing the folded tests specimen under a load of 1 kg between two flat surfaces. The load is applied by mean of the dead weight of the upper flat surface.
The arrangement for measurement of crease recovery angle has a anodised aluminium scale calibrated in degrees mounted on a vertical disc. The disc can turn about the axis of the scale and has a spring loaded clamp located at 00 to hold one end of the test specimen. The free end of the test specimen can be aligned against a vertical edge fitted in front of the disc.
The test specimen is mounted on a brass strip for convenience in use and is creased and held in the clamp while still fixed onto it.
TECHNICAL DATA :

Size of test specimen	40 x 15 mm
(Teasing load )	1.0 kg
Angle measurement	10 to 180degree x 10

RELATED STANDARD :

IS 4681 - 1968	Method for Determination of Wrinkle Recovery of Fabrics (By measurement of Crease Recovery Angle)
BS 3086 - 1972	Determination of Wrinkle Recovery of fabrics . Crease Recovery Angle Method.
ASTM D 1295-1967	Standard Method for Wrinkle Recovery of Woolen Textile Fabrics using the vertical strip apparatus.

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