Crease recovery angle

The determination of crease recovery angle before and after heat-setting of the fabric is done. The extent of crease-recovery of heat-set fabric before and after setting at and above 170-175 C will give idea of the degree of heat-setting. 

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Crease recovery angle grey cotton bleached cotton < >... 

High dry crease recovery angle Lower wet crease recovery angle... 

Normally a high dry crease recovery angle is preferred because the appearance of the dry textile is more important than that of the wet one. Between these two extremes is the moist cure, a 5-20 hour room temperature reaction with 6 % above normal moisture regain. The fabric properties of the moist cure are a good compromise between the extremes of the dry and wet processes. The moist cure is preferred when high tear strength of the finished fabric is required, but controlling the critical moisture level can be very difficult. 

These difficulties with moisture control are overcome in a continuous process using a hot flue. There the residual moisture of the fabric is easily regulated by the content of steam in the air at 6-10 %, where the best compromise of the easy-care factor (ECF) and the strength loss factor (SLF) is realised. ECF includes dry and wet crease recovery angles and the Monsanto values. SLF is a combination of... 

Flat fabrics are creased in a specified apparatus either in dry or in wet state. The final dry or wet crease recovery angle is measured. 

Special characterization methods are required to access the effective transfer of the SME to a specific application. Evaluation techniques were developed for woven cotton fabrics finished with SMPs [79]. For characterizing shape-memory fabrics a shape-memory coefficient (5%) was introduced. In the experiment a test specimen was folded and compressed under controlled conditions of time and applied force to create a folded wrinkle. The samples were then immersed in water with a defined temperature to release the shape recovery process and later dried. The determination of this coefficient was based on the obtained average crease recovery angles of a series of samples ... 

AATCC Test Method no. 66 describes measurement of recovery angle after placing a crease in a specimen. The specimen is creased by subjecting is to a prescribed load for a length of time. The recovery angle is then measured after a controlled recovery period. Recovery angles of greater than 120° are... 

The antiwrinkle effect of softeners is usually quantified by the wrinkle recovery angle, the residual angle exhibited by a fabric after having been creased and compressed. Better results are usually observed for softener-treated fabrics [34],... 

ISO 2313 1972, Textiles - Determination of the recovery from creasing of a horizontally folded specimen of fabric by measuring the angle of recovery , ISO, Geneva, 1972. 

In the course of measuring imbibition capillary pressures, Morrow (20) also determined residual non-wetting phase saturations as a function of the intrinsic contact angle. For systems which spontaneously imbibe, he found that the residual oil values in- creased as the intrinsic contact angle was increased from 0° to 62°, the limit at which spontaneous imbibition occurs. Therefore, for systems which imbibe, the best recovery should be obtained from strongly water-wet systems. 

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