Guide to Crease Recovery

 

The crease recovery property of fabric is one of the important indexes to evaluate the properties of fabric. Measuring the crease recovery angle of folded fabric samples by instrument is a common method to measure the crease recovery property of fabric.

Crease recovery properties of fabrics

When the fabric is used and stored in the process, due to folding, bending arch, compression, washing and other external forces to produce local deformation, the formation of creases or wrinkles. Even after the external force is removed, it fails to return to the original flat state, which is called creasing. Creases seriously affect the appearance of the fabric, and the wear of the fabric is often produced along the direction of creasing, accelerating the damage of the fabric. It is of great significance to understand the crease bending and recovery process of fabric and its mechanism to test the crease recovery performance of fabric.
Generally, the formation of fabric creases can be divided into two stages: fabric creasing under the action of external force and fabric creasing recovery after the removal of external force. Crease generation: Under the action of external force, the fabric bends and deforms, because the external force is much greater than the resistance of the fabric due to bending. Therefore, the fabric is forced to bend and deform, that is, beyond the flexural elastic deformation range of the fabric, resulting in yield deformation. This deformation includes the slip dislocation between the warp and weft yarn lines of the fabric, the slip between the yarn fibers, and the stretching deformation of the fibers under the action of external forces. When the fabric reaches a certain deformation, the internal stress of the fabric weakens with the extension of the external force acting time, that is, the stress relaxation occurs. Therefore, whether the fabric produces creases depends on the shape variable of the fabric and the relaxation state of the internal stress of the fabric.
Crease recovery: After the external force is removed, the fabric under the action of the elastic recovery force generated by the internal stress, the crease bending of the fabric begins to recover, that is, the Angle of the crease recovery begins to increase. The crease recovery Angle increases with time, and its change is similar to that of material creep. In this process, in addition to the elastic recovery force of the fabric, it is also affected by friction resistance. The friction resistance is caused by the relative slip between yarns and between the fibers of the yarn, and its direction is opposite to the elastic recovery force. When the elastic recovery force and friction resistance of the fabric are balanced, the fabric achieves the maximum recovery effect, and the fabric fold Angle is the crease recovery Angle of the fabric.

Fabric crease recovery tester

Fabric crease recovery tester is used to determine fabric recovery ability after being creased an indicated with crease horizontal method. This tester is suitable for fabrics with various kinds of thickness, and can get fast and slow crease recovery index under room environment.
Get more details about fabric crease recovery tester

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