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The so-called screen is different from general mesh products. Instead, there is a strict series of mesh sizes. And there are mesh products that meet the industry, agency, and standard classification and screening functions of object particles. The sieve does not say "mesh number", "mesh number" is just a habit for people to describe the screen, which is difficult to overcome for a while. The sieve is different from ordinary mesh products in that it has a strict mesh size instead of "mesh number". The screen size is not isolated. It consists of a series of mesh sizes for the purpose of hierarchical screening.


1 basic overview

According to the raw materials used, it is divided into three categories: silk screen, wire screen and synthetic fiber screen.

According to the specifications, the silk sieve is made of mulberry silk with different deniers, and is woven with full-skein, semi-skein, or plain weave. The weaving method is similar to that of mesh cloth. When the number of meshes is small, use full skein to weave. When the number of meshes is large, use half

Skein or plain weave. The specifications of silk screens are 4 to 62 holes / cm, most of which are used for screening in the grain industry, and can also be used for screening different coarse and fine sand particles in abrasive cloth factories.

The metal screen is a mesh product made of metal wire by a certain technical method. Braided with copper wire, stainless steel wire, iron wire and steel wire. The diameter of the metal wire is mostly 4 to 0.025 mm. Generally weave methods of plain weave, twill weave and mat. The metal mesh has clear and correct perforations, a flat mesh surface, high temperature resistance, wear resistance and other characteristics, and the stainless steel mesh can also resist corrosion. Therefore, metal screens are mostly used for powder screening and oil filtration.

Synthetic fiber screens are available in nylon or polyester filament and brown. The filament uses 15 to 30 denier monofilament, and the surface of the screen mesh is smooth, which is favorable for filtering. Fabric structure can be used, square flat and plain weave, etc., specifications are 19 ~ 104 holes / cm. It is mostly used for printing silk screens, made of integrated circuit printed circuit boards, and can also be used to screen fine particles such as picture tube fluorescent powder and magnetic powder of magnetic tape. The brown silk screen uses thicker nylon brown silk as the raw material, with a diameter of 0.55 to 0.1 mm, and the fabric is mostly plain weave mat structure, which is used for beneficiation, filtering pulp, and conveyor belt. Synthetic fiber screen has the characteristics of no rust and corrosion resistance, and can replace some metal screens.

2 application areas

The application fields of screens are all over industry, science and technology, agriculture and national defense. From science and technology to high-tech industries, from food, clothing, housing, and cultural life, to the simultaneous development of the national economy and to the national economy and people's livelihood. Main applications are: aviation, aerospace, printing, printing and dyeing, electronics, mining, pharmaceuticals, food, food processing, and chemical industry.

3 functional characteristics

Four functions of metal mesh: sieve, filter, protect, solid. Sieve: It is mainly used as solid particles, powder, and sieving in industries such as metallurgy, coal, rubber, petroleum, chemical industry, pharmaceuticals, automobiles, ceramics, and glass. Filtration: Mainly used in the petroleum industry as a mud net, chemical chemical fiber electroplating industry as a pickling net and liquid gas filtration and purification. Protection: It is mainly used for civil construction batch of cement, raising chickens, ducks, geese, rabbits and zoo fences. Protection of machinery and equipment, highway fences, stadium fences, road green belt protection nets. Solid: can be used in the construction industry, highways, bridges for steel reinforcement and skeleton support.

4 categories

Metal screens can be divided into: stainless steel square-hole mesh, stainless steel dense-grain mat type mesh, stainless steel embossed mesh, etc. Stainless steel square eye mesh is widely used in the screening and screening of solid materials and liquid filtration. Many industries are involved, such as chemical industry, food and condiment industry, mining industry, pharmaceutical, papermaking, metal powder manufacturing, fertilizer industry. Stainless steel dense-texture mesh stainless steel dense-texture mesh is suitable for gas, liquid filtration and other media separation, and is widely used in precision pressure filters, fuel filters, vacuum filters and other industries.

Manganese steel screen: Manganese steel is a kind of high-strength anti-manganese steel. It is mainly used for severe working conditions that need to withstand impact, extrusion, and material wear. The damage is mainly caused by wear and tear, and some parts are broken and deformed. There are three types of wear: frictional wear where the surfaces of metal components come in contact with each other and move; abrasive wear of other metal or non-metallic materials against the metal surface and erosion wear caused by the contact of flowing gas or liquid with metal. The wear resistance of wear-resistant steel depends on the material itself, and the wear-resistant steel shows different wear resistance under different working conditions. Only the material itself and the working conditions can determine its wear resistance.

The characteristics of metal screens and their product characteristics: 1. Precision weaving; 2. Mesh rules; 3. Reliable filtering accuracy; 4. High compressive strength; 5. High temperature resistance and resistance

Chemical corrosion; 6. Good abrasion resistance; 7. Good formability

Select points

The sieve is an inevitable product of the refinement of coal mines, iron ore, industry, and chemical raw materials. It is a composition of tiny cells that the society is moving forward, which indirectly or directly affects the development of society. The selectivity of the screen is mainly selected according to the characteristics of the screen.

The selectivity of the screen is mainly based on the characteristics, material, wire diameter, mesh, length of life, and price of the screen. These elements of the sieve screen are mutually influential. The thickness of the wire diameter directly affects the life and price of the screen. The abrasion resistance, corrosion resistance, high temperature resistance, and the presence or absence of magnetism are directly related to the price of the screen.

References

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