CREASE RECOVERY

Crease resistance is the property of material to resist wrinkling and to restore the initial state after the forces causing its bending is removed. Fabric crease resistance is expressed by the crease proof factor (K_c).

Crease proof factor (K_c) is characterised by the ratio of recovery angle µ of the specimen to the angle of its full bend equal to 180⁰.

K_{c       =}          (µ x 100)/180 =     µ/1.80%

The capacity of fabrics to restore the initial condition depends on the flexibility and elasticity of the materials; the capacity of resisting to bending depends on their stiffness.

According to their resistance to creasing, the fabrics are classified into three groups,

·        With medium crease resistance,    K_{c =} 30-45%

·        With low crease resistance,           K_{c =} 46-55%

·        Non- creaseable fabrics,                K_{c =} over 55%. 

                       EXAMPLE OF CREASE RECOVERY ANGLE