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Picture of filter press cloth produced by Safi Sazan Safa Company

What is filter press clothes ?!?

The products mainly include filter press clothes for belt-type, plate-and-frame, box-type, centrifugal and other filters. There are polyester, polypropylene, nylon, vinylon, and non-woven filter felt series.

filter press clothes r divided into box filter press, belt filter press, and belt-type concentration and dehydration integrated machine. It is a commonly used filter and separation equipment for sludge and food. It was used in chemical production in the early 18th century and is still widely used today. Used in chemical, pharmaceutical, metallurgy, dyestuff, food, brewing, ceramics and environmental protection industries. The filter press consists of multiple filter plates and filter frames superimposed to form a filter chamber, and uses pressure as the driving force for filtration.

Press filter cloth refers to liquid-solid separation filter cloth. The products mainly include filter press clothes for belt-type, plate-and-frame, box-type, centrifugal and other filters. There are polyester, polypropylene, nylon, vinylon, and non-woven filter felt series. which are widely used in liquid-solid separation in petroleum, chemical, smelting, mineral processing, carbon black, dyes, pharmaceuticals, food and other industries. The scope of application is also very wide, and the filtration accuracy In 0.25 ~ 150μm.

Picture of filter press cloth produced by Safi Sazan Safa Company
Picture of filter press cloth produced by Safi Sazan Safa Company

Filter press classification


The filter press operates intermittently, and there are three types: plate and frame filter press, box filter press and vertical filter press. The filter plate has stable performance, convenient operation, safety, and labor-saving. The metal and plastic-steel filter plate is precision-cast, high temperature, high pressure, and durable.


Use process


Since the filter press itself is of the same specification, the different filtration accuracy, speed, etc. required for different filtering objects are all achieved by using different filter press filter cloths, also known as filter press filter bags. The filter plate of the filter press is wrapped with filter cloth. According to the requirements of acid and alkali resistance, tensile strength, filtration accuracy, filtration speed and other requirements of different filter objects, first determine the material and model of the filter cloth to be used, and then according to the filter plate. The size, shape, and processing of the filter cloth bag that match it can be put on the filter cloth, so the filter cloth is the heart of the filter machine, and it is the same in the filter press.

filter press clothes


filter press clothes mainly includes: polyester filter cloth for filter press, polypropylene filter cloth for filter press, nylon filter cloth for plate and frame filter press, vinylon filter cloth for plate and frame filter press.


Plate and frame filter press polyester filter cloth


It is divided into polyester long fiber filter cloth and polyester staple fiber filter cloth.
Polyester staple fiber filter cloth material performance: acid resistance, weak alkali resistance. Wear resistance, corrosion resistance, recovery are very good, electrical conductivity is very poor. The temperature resistance of polyester fiber is generally 130-150 degrees Celsius. This product has the unique advantages of ordinary felt filter cloth, and its wear resistance is very good. It has a high cost performance and has become the most used felt filter material. varieties. Heat resistance: 120°C, elongation at break (%): 20-50, strength at break (g/d): 438, melting point (°C): 238·240, melting point (°C): 255-260. Specific gravity: 1.38. Filtration performance: The raw material structure of polyester staple fiber filter cloth is short and wooly, the woven fabric is dense, and the particle retention is good, but the peelability and air permeability are poor. Strength, wear resistance, and water leakage are not as good as polyester long fiber filter cloth.
Uses: pharmaceutical, sugar, food, chemical, metallurgy, industrial filter press, centrifuge, etc.
Softening point (°C): 238-240, melting point (°C): 255-260. Specific gravity: 1.38. Filtration performance: Polyester long fiber filter cloth has smooth surface, good wear resistance and high strength. After twisting, it has higher strength and better wear resistance, so the fabric has good air permeability, fast water leakage and easy cleaning. Uses: pharmaceutical, food, chemical, metallurgy, industrial filter press, centrifuge filter cloth, etc.


Nylon filter cloth


Nylon fiber has high strength, the strength is 4-5.3Cndtex. The elongation is 18%-45%. At 10% elongation, the elastic rate is above 90%. The strength of nylon is the strongest among fibers. According to the measurement, the wear resistance of nylon fiber is 10 times that of cotton fiber and 50 times that of viscose. Wear resistance ranks first among many fibers, so it is an ideal material for making car tires when pressed together with rubber. Nylon fiber is resistant to strong alkali and weak acid. After being treated with NaoH (10%) at 95°C for 16 hours, the loss of strength is negligible, but nylon is not light-resistant, easy to change color and become brittle, so 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 poisonous and harmful to human health.
Uses: rubber, ceramics, pharmaceuticals, food, metallurgy, etc. Product models: 30l, 407, 663, 17-2, 17-7.


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 with wool; polypropylene long fiber, long fiber, the formed yarn is smooth, so the industrial cloth woven from polypropylene short fiber has wool on the cloth surface, powder filtration and pressure Filtration effect is better than long fiber. The industrial cloth made of polypropylene long fiber has a smooth surface and good air permeability.
The main representatives of polypropylene filter cloth series are:
Medium and thin type: 521 522 4212 750A Thick and dense type: 750B (series) 750AB


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 3.52-5.72Cndtex. 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, and has good hygroscopicity, and is easy to combine with rubber. It is a good material used in the rubber industry. Has shrinkage and is not acid-resistant. Uses: Used in manufacturers with strong alkalinity and rubber industry. Product model: 295-1, 295-102, 295-104, 295-105, 295-107, 295-114, 295-1(A)

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