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Beijing Jingchen Times Petrochemical Equipment Co., Ltd. Address: No. 7 Liqing Road, Chaoyang District, Beijing, 100107
Home > Technical Support > How can we improve the sealing effect of precision filters?

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How can we improve the sealing effect of precision filters?
Release time: 2019-11-25 Clicks: 61 times
How can we improve the sealing effect of precision filters?
Precision filters are mainly used to trap particles and various suspended matters below 0.5um. Ultra-fine glass fiber paper is used as filter material, offset paper, aluminum film and other materials are used as split plates, which are glued with wooden frame aluminum alloy. Each unit is tested by the nanoflame method and has the characteristics of high filtration efficiency, low resistance, and large dust holding capacity. Precision filters can be widely used in the air supply of air-conditioning end of dust-free purification workshops in optical electronics, LCD liquid crystal manufacturing, biomedicine, precision instruments, beverages and foodstuffs, PCB printing and other industries. Hechao and Chaochao are both used at the end of the clean room. According to their structural forms, they can be divided into: partitions, no partitions, high air volume, ultra-filters, etc.
To extend the life of the filter, the simple way is to keep the dust out of the pre-filter. In other words, make sure that the air flow that the filter contacts is the air filtered by the pre-filter, coarse-effect filter, and medium-effect filter. At this time, the air should reach the standard of 99.95% with smaller dust particles and lower pollution. What needs to be explained here is that the replacement of the pre-filter generally does not need to stop production or stop other normal work plans and arrangements. After the precision filter is installed, the normal operation of the fresh air equipment of the air conditioner can be ensured without commissioning. So experienced customers will focus their attention on filters. For highly clean areas such as 10,000 and 100,000 clean workshops or operating rooms, F8 filtering can be used for pre-filtration (colorimetric method 95%).
Methods to improve the sealing effect of precision filters:
1. By using the negative pressure leak sealing method, the polluted air in the positive pressure space is transmitted to the negative pressure space outside the work area through human intervention to ensure that the work area is not polluted.
2. Contact filler sealing method. This method uses solid gaskets for sealing fillers, such as neoprene, closed-cell sponge rubber sheets, and liquid sealants, such as silicone rubber, neoprene, and natural rubber. Solid gaskets are usually sealed by mechanical bolt compression. The compression of rubber sheet is generally 30% -50%. Liquid sealants are sealed by filling and adhesion methods. This sealing method is also commonly used in clean rooms.
3. Liquid tank mouth sealing method. In this method, a certain height of non-Newtonian sealing liquid is injected into the groove frame, and the mouth of the precision filter is inserted into the sealing liquid, so that the air passages on both sides are blocked to achieve sealing . This sealing method has strong reliability, and the filter is easy to disassemble and install. It is usually applied to clean room seals of Class 100, Class 10 and beyond.

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