Causes of polyester cloth good elasticity has two aspects, one is the polyester filter cloth has larger elastic modulus, about 220.5-1411.2cN/tex, 2-3 times higher than nylon. The elastic modulus of polyester cloth, indicates that fiber rigid strong, not easy to generate deformation affected by external force; once the deformation, due to high rebound ratio, and easy to reply. On the other hand, from the micro structure of polyester cloth, molecular amorphous region of force is small, the chain segment movement will be affected by external force, produce a certain deformation; recrystallization zone and a high degree of orientation of the site, the intermolecular connection points are relatively strong, so the intermolecular force, force is not easy to produce deformation. Only in the large external force, connection point to destroy the crystal edge, so some of the basic structural units or molecular chains move to a new location, once the external force is canceled, the effect of these basic structural units or molecular chains are stored in the connection point without fracture energy and intramolecular rotation, shift in the original position, try to make the deformation recovery. So the deformation polyester filter cloth produced in certain force is recoverable deformation, but in highly stretched, reply performance significantly worse.
 
Since polyester filter cloth and tensile strength (modulus of elasticity), and easy to recover deformation (rebound high), so polyester filter cloth fabric is not easy to wrinkle, coupled with its moisture absorption capacity of small, to maintain flexibility in the water, the shape preserving good after washing, so polyester filter cloth making clothing with "wash and wear" the performance, after washing can not achieve wrinkle, dp. At this point the polyester filter cloth is wool is better.