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Sep 26, 2021
Filter cloth is a key medium used in filter presses for solid-liquid separation. Early filter cloths were stronger, more wear-resistant, and more tightly woven than ordinary fabrics. With the advancement of technology, synthetic fiber filter cloths made of polyester and polypropylene emerged. Along with improved manufacturing processes, metal wires were also introduced into the weaving process to enhance tensile strength, enabling filter cloths to meet the demands of modern high-pressure filtration equipment.
Today, let's explore the wrinkle resistance and elasticity properties of filter cloth.
Wrinkle resistance refers to a fabric's ability to resist deformation from bending, also known as crease recovery. Elasticity refers to a fabric's ability to return to its original shape after deformation. Both characteristics relate to the bending performance of the fabric. Filter cloths are not completely elastic materials—they undergo both reversible elastic deformation and irreversible plastic deformation under external force.
Elastic deformation that either recovers immediately or gradually over time after the removal of force is known as recoverable elastic deformation, which includes instant and delayed elasticity. Irreversible plastic deformation, on the other hand, refers to permanent changes that do not return to the original state once the force is removed.
The main factors affecting wrinkle resistance and elasticity are the properties of the fibers, yarn structure, fabric weave, and post-treatment processes.
The wrinkle resistance and elasticity of the fibers themselves play a critical role. Wrinkle resistance is largely determined by the initial modulus of the fiber—the higher the modulus, the better the wrinkle resistance.
Polyester has a high initial modulus and good elasticity, so its filter cloth resists wrinkling and maintains its shape well. Although nylon has better elasticity than polyester, its lower initial modulus makes its fabric less stiffness than polyester. Cotton and viscose fibers have relatively high initial modulus values but poor elasticity, meaning that once wrinkles form, they are difficult to remove.
