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US 2010/0300295 A1Published application
Air Filter And Air Filter Assembly For Vacuum Cleaner With The Air Filter
OwnerKeiichi Yamakawainventor
Life of this patent
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Abstract
The invention aims at providing an air filter which is improved in the tight adhesion between an ePTFE membrane and a permeable support material without impairing the mechanical strength and permeability of the support material. An air filter produced by laminating a permeable support material (1) having a region wherein fibers different in fiber diameter are entangled and a porous polytetrafluoroethylene membrane (2), wherein the mean fiber diameter of the membrane-side face of the support material (1) is smaller than that of the back of the support material (1).
Claims6
An air filter comprising:
- a permeable support material having a region where fibers having a different diameters are entangled with each other;
- and a porous polytetrafluoroethylene membrane laminated on the permeable support material, wherein
- an average fiber diameter in a front surface of the permeable support material on which the porous polytetrafluoroethylene membrane is laminated is smaller than an average fiber diameter in a back surface of the permeable support material.
Dependencies are inferred from the claim text.