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Porous material, air filter filter medium, air filter unit and support material for air filter filter medium

An air filter and support material technology, applied in the direction of filtration separation, dispersed particle filtration, chemical instruments and methods, etc., can solve the problem of insufficient adhesion between PTFE porous membrane and support material, increased pressure loss, and air filter material trapping. set efficiency reduction and other issues

Inactive Publication Date: 2002-02-06
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But, the present inventors find, along with the difference of hot-melt adhesive coating form, adhesive can block the hole of PTFE porous membrane, make the collection efficiency of air filter filter material reduce, pressure loss increases, and Sometimes the porous PTFE membrane does not adhere well to the support material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Using a hot-melt adhesive applicator (manufactured by Suntsu-l Co., Ltd.), heat the polyester-based hot-melt adhesive to a melting temperature of 210°C so that the melt viscosity is 10,000 cp, and adjust the pressure of the hot air to 1.2 kgf / cm 2 , adjust the temperature of the hot air to 230°C, and apply the polyester-based hot-melt adhesive from a fine nozzle with a diameter of 0.5mm to the poly pair moving at a line speed of 10m / min at an extrusion rate of 50g / min / m. Spun-bonded nonwoven fabric made of ethylene phthalate (PET) (weight per unit area: 50 g / m 2 , pressure loss 2pa), thus obtaining a coating amount of 5g / m 2 Air permeable support material of stacked fibrous hot melt adhesives connected by nodules.

[0056] Respectively on PTFE porous membrane (weight per unit area 2g / m 2 , pressure loss 327pa, thickness 4μm) on both sides, make the adhesive coated surface face the PTFE porous membrane and overlay the previously formed gas permeable support material, ...

Embodiment 2

[0059] Using the same hot-melt adhesive applicator as used in Example 1, heat the polyamide-based hot-melt adhesive to a melting temperature of 200°C so that the melt viscosity becomes 5,500 cp, and adjust the pressure of the hot air to 1.0 kgf / cm 2 , adjust the temperature of the hot air to 230°C, and apply the polyamide-based hot-melt adhesive from a fine nozzle with a diameter of 0.5mm to a polyamide moving at a line speed of 10m / min at an extrusion rate of 50g / min / m. Spun-bonded nonwoven fabric made of ethylene phthalate (PET) (weight per unit area 40g / m 2 , pressure loss 2pa), thus obtaining a coating amount of 5g / m 2 Air permeable support material of stacked fibrous hot melt adhesives connected by nodules.

[0060] Respectively on PTFE porous membrane (weight per unit area 2g / m 2 , pressure loss 338pa, thickness 5μm) on both sides, make the adhesive coated surface face the PTFE porous membrane and overlay the previously formed gas permeable support material, make it ...

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Abstract

An air filter filter medium having a polytetrafluoroethylene porous membrane and an air-permeable support material laminated on at least one surface of the porous membrane, wherein the porous membrane and the support material are bonded together via a fibrous hot-melt adhesive concatenated by independent fibers and / or knots, thereby keeping a high trapping efficiency of an air filter filter medium and a pressure loss as low as that encountered with a fusion bonded one.

Description

technical field [0001] The invention relates to a porous material, an air filter material, an air filter unit and a support material for the air filter material, in particular to an air filter containing a polytetrafluoroethylene porous membrane and an air-permeable support material. filter material, an air filter unit incorporating the filter material, and a support material for the air filter material. Background technique [0002] Porous membranes of polytetrafluoroethylene (hereinafter referred to as "PTFE") have been proposed as filters used for air cleaning in clean rooms and the like (see, for example, JP-A-5-202217). In addition, it has also been proposed that in the case of using a PTFE porous membrane, since the membrane itself is very thin, in order to prevent scratches and pinholes, a spunbond fiber with a skin-core structure long fiber is laminated on both sides of the PTFE porous membrane. Thermoplastic materials such as type nonwoven fabrics are protected (re...

Claims

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Application Information

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IPC IPC(8): B01D39/16B01D46/52B01D69/10B01D71/36B32B5/24B32B7/12B32B27/30C09J5/00
CPCC09J5/00B01D39/1692B01D39/1623B01D71/36B01D69/10B32B27/30B32B27/32B32B2305/026B32B5/022B32B27/322B32B2327/18B32B7/12B32B27/12B01D69/1071B01D69/106
Inventor 井上治浦冈伸树
Owner DAIKIN IND LTD
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