Wrinkle and wrinkle resistance Wrinkle property-the property of plastic bending and deformation to form wrinkles when the fabric is rubbed is called wrinkle property.
1. Reasons and main factors affecting the wrinkle resistance of fabrics
(1) Fiber properties
Fiber geometry: thick, round, and smooth fiber folds have better recovery.
Fiber elasticity: The characteristic that the fiber can recover after deformation. The wrinkle resistance of the fabric is a fundamental key factor. The larger the value, the higher the recovery of fabric wrinkles. Such as spandex and wool fabrics have good wrinkle resistance. The friction properties of fibers are the second element of anti-wrinkle. In theory, there is no slippage between fibers, that is, no energy consumption, and there is no slip recovery problem, but it will cause major changes in fibers; or there is no slippage between fibers. Sliding with resistance, no energy consumption, is conducive to the recovery of fiber deformation energy.
(2) Yarn structure: moderate yarn twist, good wrinkle resistance of the fabric.
(3) Fabric geometry: The thickness of the fabric has a significant effect on the crease recovery, and the thick fabric has better crease recovery.
(4) Environmental conditions: When the temperature and humidity increase, the fiber material is more plastic, and the frictional resistance between the fibers will become greater.

Ways to improve wrinkle resistance:
Follow two basic mechanisms of anti-wrinkle: high elasticity of fibers and low friction or elastic connection between fibers.　
　
2. The main factors affecting the retention of pleated
 A. Basic influencing factors: the stability of the fiber structure after shaping and the stability of the inter-fiber structure.
(1) Thermoplasticity and elasticity of fiber
Thermoplastic and elastic fibers can form good pleats and other deformations during heat setting. Although new deformation occurs due to external force during use, once the external force is eliminated, the ability to return to the original folds, creases, and embossing shapes is also better. Polyester and acrylic fibers have the best pleated durability, nylon fabrics have the best pleated durability, and vinylon and polypropylene have poor pleated durability.
(2) Yarn twist and fabric thickness
Fabrics with large twists and thicknesses have better pleating durability after ironing.
(3) Temperature, pressure and moisture content of fabric during heat setting treatment
The moisture content of the fabric has a great relationship with the durability of the pleats. At a certain moisture content, the crease effect is the greatest, and the increase in the moisture content will cause the iron surface temperature to drop and reduce the crease effect. Increasing the temperature of the iron will move the optimum moisture content to a higher direction.
(4) Ironing time
At the appropriate temperature, when thick fabrics are ironed for 10s, generally good creases can be obtained, and the creases reach equilibrium in 30s.
(5) Resin finishing
After the non-hot-melt fabric is finished with resin, the pleated durability is improved.　
B. The pleat retention of the fabric　
The general concept of fabric pleat retention
Pleated retention-the pleats (including embossing and creases) formed by ironing the fabric, the degree of shape retention after washing is called the pleat retention.
Pleated retention is essentially a manifestation of the thermoplasticity of most synthetic fabrics. Since most synthetic fibers are thermoplastic polymers, they can generally be heat-set to obtain various pleats, embossings or folds for these fibers or blended fabrics based on such fibers mark.