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How to distinguish the material of filter cloth?

2022-01-24 Page view : 69 views

Filter cloth, a filter medium woven from natural or synthetic fibers. Commonly used materials include cotton, hemp, wool, cocoon silk, asbestos fiber, glass fiber and some synthetic fibers. For example, cotton canvas, twill and wool, etc. Broadly speaking, filter cloth also includes metal mesh or filter screen.

 

Synthetic fibers mainly include polypropylene, polyester, nylon and vinylon, among which polyester and polypropylene are most commonly used, mainly for solid-liquid separation, while nylon is widely used in coal washing plants because of its excellent wear resistance.

 

Filter cloth and screen made of polyester, polypropylene, nylon, vinylon and cotton are widely used in pharmaceutical, chemical, dye, steel, construction, iron smelting, chemical, ceramic, cement, geology, mineral and other industries.

 

Special filter cloth: aramid, PTFE, PVDF, etc., with high service temperature.

 

The filter cloth of bag filter is woven by fiber, just like cloth, so the filter cloth of bag filter has high flexibility and ductility. It is precisely because of this that the filter cloth is easy to be damaged in the use of bag filter; especially hard objects appear on the filtered materials. When the filter cloth is punctured, it will pass through the filter cloth during operation, so the filtration will not play a great role.

 

The mesh number of bag filter cloth is too small.

 

Mesh number is an important parameter of filter cloth, and the size of the parameter indicates the number of filter holes of the filter cloth. The smaller the mesh, the larger the filter hole of the bag filters. On the contrary, the smaller the filter hole of the bag filters cloth. Therefore, in the process of filtering materials, the filter cloth with small mesh will make a lot of solids pass through the filter cloth in a normal way, which eventually leads to the fact that the filtered liquid is not clear to the bottom.

 

Flue gas treatment and dust removal system of iron making plant, steel plant, ferroalloy plant, refractory plant, foundry, power plant, etc. Flue gas filtration of waste incinerator, coal-fired boiler, fluidized bed boiler, etc. Asphalt concrete mixing, building materials, cement ceramics, lime, gypsum and other production sites. Aluminum electrolysis, smelting of lead, tin, zinc, copper and other rare metals, flue gas filtration, fine material recovery, liquid-solid separation. Liquid solid separation and fine material recovery in chemical industry, coke, carbon black, dyes, pharmacy, plastics and other fields. Dust treatment and purification collection in mining, grain processing, flour, electronic industry, wood processing, etc.

 

How to distinguish what material the filter cloth is made of?

 

  1. Look. In terms of the color of the filter cloth, the large chemical fiber filter cloth is white and has good luster. The small chemical fiber filter cloth is dark and gray, and some filters are yellow. For the gloss of the filter cloth, the surface of the long fiber filter cloth is smooth and bright, and the surface of the short fiber filter cloth is hairy. For the lines of filter cloth, such as twill and plain, these lines can also help you judge the model.
  2. Touch. (Softness) short fibers, such as 208729, are as soft as plush cloth. 734, 747, 758 and 3927 are all woven from the same raw materials, but the thickness and density are different, 3927 very rough, strong and not soft. The softness and roughness need to be touched bit by bit with the sample. The corresponding filter cloth specifications have their own density coefficient, which can be roughly distinguished as long as they are compared.
  3. Weigh. It is mainly to measure the thickness of the filter cloth. It is best to take a small piece and weigh it (grams per square meter).
  4. Burn. Among them, polyester burns black smoke and polypropylene burns blue.

The order is to first determine whether it is woven, then determine the material (polyester, polypropylene or what), and then make a general judgment on the long and short fibers and lines. Then comprehensively determine the filter cloth model according to the thickness, density and gram weight of the filter cloth.