The dust material in the air is subject to a certain field force. When it encounters a specific filter material such as non-woven fiber material and special paper during the directional displacement process, large particulate matter with a diameter greater than 0.5 microns, due to its larger diameter and inertia. Force to grab, the probability of hitting the filter material fiber is large, so the dust cannot pass through the filter material, and the filter filtering effect is good at this time. The matter with small particles smaller than 0.1 micrometers has a certain direction in the action of field force, but it mainly diffuses. Filter media, especially paper media, has thin fibers, and the van der Waals force between the two micromolecules makes them stick together so that dust cannot pass through the filter media. This is the best filter effect. When we bring the filter material on and keep it static, some of the dust can be retained due to the static electricity of the filter material, because the dust cannot pass through the filter material.
Filter supplies can be divided into the following categories: filter cotton; filters; filter equipment; other filter materials.
filter sponge The scope of filter cotton is relatively wide. Generally referred to as filter cotton (filter cotton) generally refers to air filtration. Polyester fiber (polyester fiber is made of polyethylene terephthalate, also known as synthetic fiber or polyester, abbreviated as PET) is the main raw material. It has excellent wrinkle resistance, elasticity and dimensional stability, good electrical insulation properties, sunlight resistance, friction resistance, no mildew and mildew, good chemical resistance, weak acid and weak alkali. Many industrial production must be carried out in relatively clean spaces, such as surface treatment, paint coating, spraying, precision electronics, optoelectronics, biopharmaceuticals, food production, air cooling, etc. These environments require flowing air, but no dust, Therefore, it is necessary to filter out the dust with filter cotton, and only let clean air circulate in the opposite space, so as to meet the needs of production and operation. Through the mechanical action to achieve the purpose of dust removal, the filtration efficiency depends on the size of the gap of the filter material. In theory, as long as the gap is small enough, any dust in the atmosphere can be trapped. Primary efficiency filter cotton is mainly used for fresh air filtration, filtering ≥5 microns and foreign matter, large dust holding capacity, low resistance, cheap price, simple structure; medium efficiency filter cotton is mainly used for fresh air end and return air filtration of spraying production line, mainly filtering 1 -10 micron suspended particles. According to the national standard, it can be divided into: primary effect, intermediate effect. According to European standards, it can be divided into: G1.G2.G3.G4.F5.F6.F7.F8.
filter Air filter refers to air filter device, generally has flat filter, pleated filter, bag filter, combined filter and other forms, mostly used in clean workshops, workshops, laboratories and clean operating rooms.
Air filters can be divided into primary filters according to their working filtration accuracy and filtering efficiency, mainly filtering dust particles ≥5 microns; medium-effect filters, mainly filtering dust particles ≥1 microns; high-efficiency filters, mainly filtering ≥0.3 Micron dust particles. It is suitable for air filtration at normal temperature and humidity, and also allows traces of acid and alkali organic solvents. It is widely used in surface treatment, coating, optics, electronics, air conditioning, aerospace, aviation, food, pharmaceutical, biological engineering and other fields.
Filtration equipment Exclude particulates, harmful air, bacteria and other pollutants in the air within a certain range of space, and control indoor temperature, cleanliness, pressure, air velocity and air distribution, noise vibration and lighting, and static electricity within a certain demand range Engineering disciplines. FFU, air shower room, high-efficiency air outlet, clean workbench, transfer window, and other specially designed rooms for purification projects. No matter how the outside air conditions change, the room has the original cleanliness, temperature, humidity and pressure required And other performance.
Other filters Other filter materials mainly include: photocatalyst air purifier, biochemical cotton, dust bag, filter element and activated carbon filter material.