Abstract Method of producing a multi-layer filter from a multiplicity of flat filter elements such as wire gauze, perforated sheet or the like where the individual filter elements have different degrees of fineness, including arranging the multiplicity of filter elements in an assembly having smooth gradations of fineness with the finest material at one end and the coarsest material at the other end of the assembly; welding or soldering the assembly of filter elements together in an area including the periphery of the final multi-layer filter to be made; aligning the welded or soldered assembly in a conventional punching means having a punching tool with the end of the assembly containing the finest filter element directed toward the punching tool and with the punching tool aligned with the welded or soldered area, and activating the punching means whereby to cut out a filter from said assembly within the welded or soldered area and at the same time forcing the finer filter layers at least partially around the next adjacent more coarse filter layers and stretching the filter layers in proportion to their fineness.
Method of producing a multi-layer filter assembly which comprises arranging and juxtaposing a multiplicity of individual sheets of filter element material in ascending order of filter fineness so that one end sheet has the finest mesh size and the opposite end sheet has the coarsest pore size; substantially permanently joining said sheets together in an area of a configuration and size which overlaps the configuration and size of the multi-layer filter assembly sought to be made; inserting such joined sheets in a punching means having a punch member of the configuration and size of the multi-layer filter assembly sought to be made; positioning said joined sheets in said punching means so that said finest mesh size sheet is directed toward said punch member; aligning said punch member with said sheet joining area; and punching out said multi-layer filter assembly while simultaneously stretching the finer mesh filter elements over their next adjacent coarser filter element.
Claim 2
Dependent Claim
154 words
Method of producing a multi-layer filter assembly which comprises arranging and juxtaposing a multiplicity of individual sheets of filter element material in ascending order of filter fineness so that one end sheet has the finest mesh size and the opposite end sheet has the coarsest pore size; substantially permanently joining said sheets together in an area of a configuration and size which overlaps the configuration and size of the multi-layer filter assembly sought to be made; inserting such joined sheets in a punching means having a punch member of the configuration and size of the multi-layer filter assembly sought to be made; positioning said joined sheets in said punching means so that said finest mesh size sheet is directed toward said punch member; aligning said punch member with said sheet joining area; and punching out said multi-layer filter assembly while simultaneously stretching the finer mesh filter elements over their next adjacent coarser filter element.
Claim 3
Dependent Claim
24 words
The method claimed in claim 1 wherein said sheets of filter element material are metal and wherein the joining is by welding or soldering.
Claim 4
Dependent Claim
23 words
The method claimed in claim 1 wherein said sheets of filter material are thermoplastic organic polymer and wherein the joining is by welding.