EP0053879A2
Expired / Lapsed
EP
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Filter elements and processes for the production thereof
Assignee: Denso Corp
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Filing: 1981-11-11
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Granted: —
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Expires: 2001-11-11
Abstract
Abstract A filter for removing particles from fluids, in the form of an element comprising fibres bonded to each other with a binder and/or hot-pressed, having a fibre density of 0.01 to 0.1 at the side for inflow of fluid and a fibre density of 0.05 to 0.4 at the side for outflow of the fluid, with a continuous gradient of increasing fibre density from the inflow side to the outflow side, and with uniform composition of the fibre material throughout the thickness of the element; and a process for the production thereof. The filter is particularly useful as an air filter for automobiles or air conditioners.
Inventors
- 👤 Yatsuhiro Tani
- 👤 Susumu Ohmori
- 👤 Hideki Komagata
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 19:52
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/70; D04H1/72; B; B01; B01D; B01D46/00; B01D46/10; D04H1/40; D04H1/42; D04H1/4326; D04H1/435; D04H1/58; D04H1/60; F; F02; F02M; F02M35/00; F02M35/02; F02M35/024; B01D2239/00; B01D2239/02; B01D2239/0216; B01D2239/0233; B01D2239/04; B01D2239/0471; B01D2239/06; B01D2239/0604; B01D2239/0618; B01D2239/064; B01D2239/065; B01D2239/069; B01D2239/0695; B01D2239/08; B01D2239/086; B01D2239/12; B01D2239/1233; B01D2239/1241; B01D2239/1291; Y; Y10; Y10S; Y10S55/00; Y10S55/05
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
85 words
A filter for removing particles from fluids, in the form of an element comprising fibres bonded to each other with a binder and/or hot-pressed, characterised by a fibre density of 0.01 to 0.1 at the side for inflow of fluid and a fibre density of 0.05 to 0.4 at the side for outflow of fluid, with a continuous gradient of increasing fibre density from the inflow side to the outflow side, and with uniform composition of the fibre material throughout the thickness of the element.
Claim 2
Dependent Claim
85 words
A filter for removing particles from fluids, in the form of an element comprising fibres bonded to each other with a binder and/or hot-pressed, characterised by a fibre density of 0.01 to 0.1 at the side for inflow of fluid and a fibre density of 0.05 to 0.4 at the side for outflow of fluid, with a continuous gradient of increasing fibre density from the inflow side to the outflow side, and with uniform composition of the fibre material throughout the thickness of the element.
Claim 3
Dependent Claim
22 words
A filter element according to claim 1, characterised in that the fibres are a mixture of at least two kinds of fibre.
Claim 4
Dependent Claim
22 words
A filter element according to claim 1 or claim 2, characterised in that the fibres have a denier of 0.001 to 15.
Claim 5
Dependent Claim
82 words
A filter element according to any of claims 1 to 3, characterised in that the fibre density gradient is approximately shown by an exponential curve of the following equation: wherein a = fibre density at a distance:ℓ, a i = fibre density at the side for inflow of fluid, a = a constant within the range 0.35 to 0.64, ℓo = thickness of the filter, and ℓ = distance from the side for inflow of fluid, measured in the direction of thickness.
Claim 6
Dependent Claim
20 words
A multiple filter characterised by comprising at least two elements according to any of claims 1 to 4, laminated together.
Claim 7
Dependent Claim
24 words
A multiple filter characterised by comprising one or more elements according to any of claims 1 to 4, plus a non-woven fabric, laminated together.
Claim 8
Dependent Claim
96 words
A process for the production of a filter element, according to any of claims 1 to 6, characterised by comprising passing a gas containing finely divided binder through webs having a fibre density of 7 x 10 -4 to 1 x 10 -2 at a flow range of not more than 4 m/second, adhering the binder to the webs in an amount of 10 to 80% by weight t6 the total weight of webs, hot-pressing the binder--containing webs at a fibre density of not higher than 0.2, and allowing the webs to recover from the pressing.
Claim 9
Dependent Claim
20 words
A process according to claim 7, characterised in that the binder has a particle size of 1 to 150 µ.
References Cited (Backward Citations)
No citation records indexed.
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