The material of the filter cloth is usually selected according to the corrosiveness of the medium, so that the filter cloth will not cause corrosion during operation. Secondly, consider the strength of the filter cloth material. The filtration accuracy: in fact, it is the pore size of the filter element of the filter; solution containing impurities The size of the largest particle that is allowed to pass through the filter.
Mesh\micron\inch\filter precision conversion table
Mesh/mesh, micron/micron, inch/inch-
12 --------------1680-----------661
16 --------------1190-----------469
20----------------840------------331
25----------------710------------280
30----------------590------------232
35----------------500------------197
40----------------420------------165
45----------------350------------138
50----------------294------------117
60----------------250-------------98
70----------------210-------------83
80----------------177-------------70
100---------------149------------59
120---------------125------------49
140---------------105------------41
170----------------88------------35
200----------------74------------29
230----------------62------------24
300----------------50------------20
325----------------44------------17
400----------------36-----------12
Filter press is divided into chamber filter press, plate and frame filter press, belt filter press filter press. The filter cloth mainly includes: polyester filter cloth for filter press, polypropylene filter cloth for filter press, nylon filter cloth for plate and frame filter press, and vinylon filter cloth for plate and frame filter press.
1. Polyester filter cloth for plate and frame filter press
is divided into polyester filament filter cloth, polyester staple fiber filter cloth.
Polyester staple fiber filter cloth material properties: acid resistance, weak alkali resistance. It has good abrasion resistance, corrosion resistance and recovery properties, and poor electrical conductivity. The temperature resistance of polyester fibers is generally 130---150 degrees Celsius. This product has the unique advantages of ordinary felt filter cloth, and has very good wear resistance. It has a high cost performance and has become the most used felt filter material. Variety. Heat resistance: 120℃, breaking elongation (%): 20-50, breaking strength (g/d): 438, melting point (℃): 238·240, melting point (℃): 255-260. Specific gravity: 1.38. Filtration performance: The raw material structure of polyester staple fiber filter cloth is short and woolly, and the woven fabric is dense, with good particle retention, but poor peeling and air permeability. Strength and wear resistance, water leakage is not as good as polyester filament filter cloth
Use: pharmaceutical, sugar, food, chemical, metallurgy, industrial filter press, centrifuge, etc.
Polyester filament filter cloth material properties: acid resistance, weak alkali resistance. It has good abrasion resistance, corrosion resistance and recovery properties, and poor electrical conductivity. The temperature resistance of polyester fibers is generally 130---150 degrees Celsius. This product has the unique advantages of ordinary felt filter cloth, and has very good wear resistance. It has high cost performance and has become the most used felt filter material. Variety. Heat resistance: 120℃, breaking elongation (%): 20-50, breaking strength (g/d): 438, softening point (℃): 238-240, melting point (℃): 255-260. Specific gravity: 1.38. Filtration performance: The polyester filament filter cloth has a smooth surface, good abrasion resistance, and high strength. After twisting, it has higher strength and better abrasion resistance, so that the fabric has good air permeability, fast water leakage and easy cleaning.
Uses: pharmaceutical, food, chemical, metallurgy, industrial filter press, centrifuge filter cloth, etc.
2. Nylon filter cloth
Nylon fiber has high strength, the strength is 4-5.3 Cndtex. The elongation rate is 18%-45%. At 10% elongation, the elastic co-recovery rate is above 90%. The strength of nylon is the strongest among the fibers. According to measurement, the abrasion resistance of nylon fiber is 10 times that of cotton fiber and 50 times that of viscose. Abrasion resistance ranks first among many kinds of fibers, so pressing together with rubber is an ideal material for making automobile tires. Nylon fiber is resistant to strong alkali and weak acid. After being treated with NaoH (10%) at 95℃ for 16 hours, the strength loss is negligible, but nylon is not light fast and easy to change color and become brittle. Therefore, nylon fabrics should not be exposed to sunlight for a long time. Nylon 66 cannot be used in pharmaceutical and food manufacturers because it is toxic and harmful to human health
Application: rubber, ceramics, pharmaceutical, food, metallurgy, etc.
3. Polypropylene filter cloth
Filter cloth classification: polypropylene staple fiber filter cloth; polypropylene long fiber filter cloth.
Filtration performance: polypropylene staple fiber, short fiber, spun yarn ribbon hair; polypropylene long fiber, long fiber, the formed yarn is smooth, so the industrial cloth made of polypropylene staple fiber, the cloth surface is hairy, powder filtering and pressure The filtering effect is better than that of long fiber. The industrial cloth made of polypropylene long fiber has a smooth surface and good air permeability.
Fourth, vinylon filter cloth
Performance: The chemical name of vinylon filter cloth is polyvinyl alcohol. Its strength is lower than that of polyester, and its strength is only 3.52-5.72 Cndtex. The elongation at break is 12% to 25%. Poor elasticity, poor fabric shape retention, good abrasion resistance, and durability 1-2 times that of pure cotton. But one of the biggest advantages is that it can withstand the action of strong alkali, has good moisture absorption, and is easy to combine with rubber. It is a good material used in the rubber industry. Its disadvantage is that the temperature is low, and the temperature is 100 ℃. Shrinkage, not acid resistant.
Uses: Used for manufacturers with strong alkalinity and rubber industry.
