Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Forming continuous work followed by cutting
Patent
1990-05-17
1992-02-18
Chiesa, Richard L.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Forming continuous work followed by cutting
55521, 55527, 264310, 264322, 264DIG48, B29C 5306
Patent
active
050892029
ABSTRACT:
Filter cartridge, in particular with a block-like shape, having a plurality of fold walls created by folding a permeable filter medium in a zig-zag fashion and which is provided with offsets formed by scoring so that a medium to be filtered passes through from one edge area of the zig-zag folding in the direction of the edge area of the folding on the opposite side. The offsets of adjacent fold walls which face one another contact each other as spacers and the filter medium is at least hardenable in the region of said offsets under the influence of heat. The permeable filter medium has fibres of thermoplastic material and the configuration of the fibres becomes more compact. The rigidity of the filter medium is increased by the welding of the filter medium under the influence of heat in the region of the offsets.
REFERENCES:
patent: 3112184 (1963-11-01), Hollenbach
patent: 3189179 (1965-06-01), McMichael
patent: 3388536 (1968-06-01), Nash
patent: 3392843 (1968-07-01), Mumby
patent: 3520417 (1970-07-01), Durr et al.
patent: 3531920 (1970-10-01), Hart
patent: 4041203 (1977-08-01), Brock et al.
patent: 4268290 (1981-05-01), Barrington
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