Chinese
Filter press filter cloths mainly include: polyester filter cloth, polypropylene filter cloth, nylon filter cloth, and vinylon filter cloth.
(I) Polyester Filter Cloth
Divided into polyester long fiber filter cloth and polyester short fiber filter cloth.
Polyester short fiber filter cloth material properties: acid and weak alkali resistant. Excellent abrasion resistance, corrosion resistance, and resilience; poor electrical conductivity. Polyester fibers generally withstand temperatures between 130-150 degrees Celsius. This product possesses the unique advantages of ordinary felt filter cloths and also exhibits excellent abrasion resistance, making it the most widely used type of felt filter media due to its high cost-effectiveness. Heat resistance: 120℃, elongation at break (%): 20-50, tensile strength (g/d): 438, melting point (℃): 238-240, melting point (℃): 255-260. Specific gravity: 1.38. Filtration Performance: Polyester staple fiber filter cloth has a short and fibrous raw material structure, resulting in a densely woven fabric with good particle retention, but poor peelability and air permeability. Its strength, abrasion resistance, and water leakage are also inferior to polyester long fiber filter cloth.
Applications: Pharmaceuticals, sugar refining, food processing, chemicals, metallurgy, industrial filter presses, centrifuges, etc.
Polyester long fiber filter cloth softening point (°C): 238-240, melting point (°C): 255-260. Specific gravity: 1.38. Filtration Performance: Polyester long fiber filter cloth has a smooth surface, good abrasion resistance, and high strength. After twisting, its strength is even higher, and its abrasion resistance is even better, resulting in good air permeability, fast water leakage, and easy cleaning. Applications: Pharmaceuticals, food processing, chemicals, metallurgy, industrial filter presses, centrifuge filter cloths, etc.
(II) Nylon Filter Cloth
Nylon fiber has high strength, ranging from 4 to 5.3 Cndtex, with an elongation of 18% to 45%. At 10% elongation, its elastic recovery rate is over 90%. Nylon has the strongest strength among fibers; according to measurements, its abrasion resistance is 10 times that of cotton and 50 times that of viscose. Its abrasion resistance is the highest among various fibers, making it an ideal material for manufacturing automobile tires when pressed with rubber. Nylon fiber is resistant to strong alkalis and weak acids. After treatment with 10% NaOH at 95℃ for 16 hours, the strength loss is negligible. However, nylon is not light-resistant and easily discolors and becomes brittle; therefore, nylon fabrics should not be exposed to direct sunlight for extended periods. Nylon 66 cannot be used in pharmaceutical or food manufacturing because it is toxic and harmful to human health.
Applications: Rubber, ceramics, pharmaceuticals, food, metallurgy, etc.
(III) Polypropylene Filter Cloth
Filter Cloth Classification: Polypropylene staple fiber filter cloth; Polypropylene long fiber filter cloth.
Filtration Performance: Polypropylene staple fiber has short fibers, resulting in fuzzy yarn; polypropylene long fiber has long fibers, resulting in smooth yarn. Therefore, industrial cloth woven from polypropylene staple fiber has a fuzzy surface, and its powder filtration and pressure filtration effects are better than those of long fiber. Industrial cloth woven from polypropylene long fiber has a smooth surface and good air permeability.
(IV) Vinylon Filter Cloth
Performance: The chemical name of vinylon filter cloth is polyvinyl alcohol. Its strength is lower than that of polyester, only 3.52-5.72 Cndtex. Its breaking elongation is 12%-25%. It has poor elasticity and poor shape retention, but good abrasion resistance and durability 1-2 times that of pure cotton. However, its biggest advantage is that it can withstand the action of strong alkalis and has good hygroscopicity, making it easy to bond with rubber. It is a good material for use in the rubber industry. Its disadvantages are that it has low temperature resistance, shrinking at 100℃, and is not resistant to acids. Uses: Used in factories with strong alkalinity and in the rubber industry.
