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AssigneesTeijin Limited, Mahle Filter Systems Japan Corporation
InventorsYuichi Hamada, Mitsutoshi Suzuki, Hiroyuki Ishii, Kenji Inagaki
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Provided are a filter medium for a filter, which makes it possible to obtain a filter high in collection efficiency, low in pressure loss and long in filter lifetime, a method for producing the same, and a filter using the filter medium for a filter. A filter medium for a filter is used as a constituent member of a filter and composed of a wet type nonwoven fabric, wherein the filter medium for a filter has a multilayer structure of two or more layers, and there is no interface between the above-mentioned two layers.
A filter medium for a filter, which is used as a constituent member of a filter and composed of a wet type nonwoven fabric, characterized in that the filter medium for a filter has a multilayer structure of two or more layers and in that there is no interface between two adjacent layers of the multilayer structure.
A method for producing a filter medium for a filter comprising (1) performing papermaking using a slurry for a first layer, (2) additionally putting a slurry for a second layer therein until the papermaking process is completed, and (3) further repeating the same operation as in the process of (2) also in a subsequent process as needed.
Dependencies are inferred from the claim text.