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Air filtering assembly and device

An air filtration device and air filtration technology, which can be used in the direction of filtration separation, lamination device, membrane filter, etc., and can solve the problems of unclear manufacturing methods

Inactive Publication Date: 2004-05-12
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But, for the air filter material that PTFE porous film and gas-permeable supporting material are laminated, although it is known to have the PF value of 19.8 in the Japanese Patent Laid-Open No. 10-30031 communiqué, and the PF value of 21.8 in WO98 / 26860, there is still I don't know of anyone with a PF value over 22
[0010] Moreover, for the air filter device with the air filter material made of laminated air-permeable support material on the pleated PTFE porous membrane, WO98 / 2860 describes that the calculated PF value is 90.6 (but it is not clear how to make it) ), exceeding 90.6 and its detailed manufacturing method is unclear

Method used

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  • Air filtering assembly and device
  • Air filtering assembly and device
  • Air filtering assembly and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0178] 100 parts by weight of PTFE fine powder (polytetrafluoroethylene synthetic resin fine powder F-104U manufactured by Daikin Industry Co., Ltd.) with a number average molecular weight of 6.2 million was added as an extrusion aid. bit) 25 parts by weight are mixed.

[0179] This mixture was molded into a round rod by paste extrusion, and the round rod shaped body was heated to 70° C., and then formed into a film by a calender roll to obtain a PTFE film. The film was passed through a hot air drying oven at 250° C. to evaporate and remove the extrusion aid to obtain an unsintered film with an average thickness of 200 μm and an average width of 150 mm.

[0180] Next, use figure 1 In the shown device, the unsintered PTFE membrane is stretched at a stretch ratio of 5 times in the longitudinal direction. The green film is fixed on roll 1 and the stretched film is wound on take-up roll 2 . The stretching temperature was 250°C.

[0181] use figure 2 The device (spread frame)...

Embodiment 2

[0183] The longitudinally stretched film that embodiment 1 obtains adopts figure 2 The device shown in the left half was stretched in the transverse direction by a factor of 40 and heat-set. At this time, the stretching temperature was 290°C, the heat setting temperature was 350°C, and the stretching speed was 440% / sec.

Embodiment 3

[0185] The longitudinally stretched film that embodiment 1 obtains adopts figure 2 The device shown in the left half was stretched in the transverse direction by a factor of 25 and heat-set. At this time, the stretching temperature was 290°C, the heat setting temperature was 380°C, and the stretching speed was 275% / sec.

[0186] The physical properties of the porous PTFE membrane obtained in Examples 1-3 are as follows.

[0187] Example

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Abstract

An air filter medium comprising a porous polytetrafluoroethylene film and an air-permeable support member laminated on at least one surface of said porous film and having a PF1 value exceeding 22, which is calculated according to the following formula: <DF>PF1 = Ä-log(Penetration (%) / 100) / Pressure loss (mmH2O)Üx100 < / DF> in which the penetration (%) = 100 - Collection efficiency from a pressure loss (unit: mmH2O) measured when an air is flowed through the air filter medium at a flow velocity of 5.3 cm / sec. and a collection efficiency (unit: %) measured using dioctyl phthalate having a particle size of 0.10 to 0.12 mu m. This air filter medium has a low pressure loss and a high collection efficiency.

Description

[0001] This application is a divisional application of No. 00128696.X Chinese Invention Patent Application entitled "Air Filter Material, Filter Assembly, Filter Device, and Air Filter Material" filed on July 24, 2000. technical field [0002] The present invention relates to an air filter material, an air filter assembly and an air filter device made thereof, and a manufacturing method of the air filter material. An air filter material of a porous membrane, an air filter assembly and an air filter device made of the same, and a method for manufacturing the air filter material. Background technique [0003] With the improvement of semiconductor integration and liquid crystal performance, the cleanliness of the clean room has become increasingly demanding in recent years, which requires an air filter with higher particle capture efficiency. [0004] At present, the high-performance air filters used in this type of air filt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/16B01D46/00B01D46/10B01D46/52B01D46/54B01D67/00B01D69/02B01D69/10B01D71/36B29C55/00B29C55/18B32B5/18B32B5/24
CPCB01D39/1692B32B2305/20B01D39/1623B32B5/18B01D2325/04B01D71/36B01D46/523B29C55/18B29K2027/18B32B2327/18B01D67/0027B01D46/10B01D2279/55B01D46/54B01D69/02B01D46/0001B32B37/04B32B5/24B32B2038/0028B29C55/005B01D2279/50B01D69/10B01D2325/20Y10T428/249978B01D69/1071B01D39/16B32B27/322B32B5/022B32B27/12B32B2307/724B32B2305/026
Inventor 涩谷吉之乾邦彦清谷秀之田中修
Owner DAIKIN IND LTD