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High efficiency air filter structure selection
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Structure: The outer frame mainly uses: aluminium alloy profile, multi-layer plate frame, aluminium plate frame, galvanised steel plate frame, the most used aluminium alloy profile frame, mainly made into a square-shaped structure. Some manufacturers use electrostatic polytetrafluoroethylene fibres (electret) to manufacture high-efficiency filters, commonly known as PTFE. High efficiency structures are also available without and with dividers. The main use of heat-soluble adhesive as a separator of the filter element is convenient for mechanised production. With the advantages of small size, light weight, easy installation, stable efficiency and uniform air speed, the filters of large quantities required for clean plants mostly adopt the structure without partitions. There are high efficiency partitions, mostly made of aluminium foil and paper folded as cartridge separators to form air channels. The partition plate is made of high quality kraft paper, hot rolled into shape or used offset paper as partition plate. The main purpose is to prevent the divider from shrinking under the influence of hot and cold, dry and humid, thus emitting particles. However, when the temperature and humidity change, this kind of partition paper may have larger particles emitted, thus causing the cleanliness test of the clean plant to fail. Therefore, the use of partitionless HEPA filters is recommended for premises with high cleanliness requirements. The price of a partitioned filter is higher than the price of a partitionless one, so fewer premises use partitioned ones. In addition, the V-shape of the filter further improves the uniformity of the dust holding capacity and extends the service life compared to the rectangular passage of a partitioned filter. Partitionless filters for ventilation avoid the use of metal parts and are easy to dispose of, meeting increasingly stringent environmental requirements. Apart from certain special applications where high temperature resistance and high safety are required, partitionless filters can be used in place of partitioned filters. |
