Filter cartridge having a honeycombed outer surface, and method of manufacture
AssigneeA.R.E. S.A.R.L.
InventorsRobert Lhuillier, Michael Selesnick, Jean Vieville, John Wolfe
Life of this patent
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Abstract
A filter cartridge of the type made from a sheet of filter paper pleated as an accordion on a cylindrical surface. It is produced by pinching pairs of contiguous pleats at various levels in order to make on the outer surface of the cartridge a plurality of honeycombs. The invention results in substantially prolonged life of the filter cartridges, which have applications in a variety of uses, including regeneration of solvents of washing baths for dry cleaning machines, filtration of air for internal combustion engines and water filtration.
Claims12
A method of manufacturing a filter (1) from a sheet (3) of filter material (5), constituted in particular by resin-impregnated paper fibers, the method which is intended to increase the efficiency and the lifetime of the filter (1) by increasing and by distributing its filtering surface area consists in particular:
- in shaping the sheet (3) concertina-like (7) in a series of folds (9, 10, 11, 12, 13, etc. . . ) which are parallel to a common "folding" direction (x1, x'1) and which are of equal depth;
- in holding said concertina (7) by its side edges outside the folds (9, 10, 11, 12, 13, . . . ) in two end supports in such a manner as to constitute a filter (1) having an outer face (E) via which it is intended to receive the fluid to be filtered (along f), for passing through the sheet (3), and an inner face (I) via which the fluid is to leave after passing through the sheet (3);
- and
- in providing at least a minimum separation between at least some portions of adjacent outer folds (9, 10, 11, 12, 13, . . . );
- said method being characterized by the following combination:
- firstly at least two adjacent folds (9, 10), (11, 12), (13, 14) of the outer face are clamped together at at least two levels (p1, p2, p3) at different heights along the sheet (3) in the "folding" direction (x1, x'1) said at least two adjacent folds (9, 10), (11, 12), (13, 14) thus providing facing intermediate portions situated between two clamping points;
- and
- secondly said two intermediate portions between said clamping points said at least two adjacent folds (9, 10), (11, 12), (13, 14) are separated so as to provide at least one honeycomb cell (21) in the outer face (E) of the filter (1) between said at least two adjacent folds (9, 10), (11, 12), (13, 14).
A cylindrical filter cartridge (1) of the type manufactured from a sheet (3) of filter material (5) constituted in particular by resin-impregnated paper fibers and given a concertina (7) shaped having folds (9, 10, 11, 12, 13, 14 . . . ) extending along a first "folding" direction (x1, x'1), with each of said folds (9, 10, 11, 12, 13, 14 . . . ) being of the same depth, two side edges of the sheet parallel to the "folding" direction being held against each other in such a manner as to separate and spread out said folds (9, 10, 11, 12, 13, 14 . . . ) of the filtering concertina (7) around a substantially cylindrical surface about the first direction (x1, x'1), and a cylindrical filter block thus created being held between two ends disks (19), said cylindrical filter cartridge (1) being characterized in that said folds (9, 10, 11, 12, 13, 14 . . . ) are spread out and connected together in pairs in such a manner as to provide a plurality of honeycomb cells (21) in an outer face (E) of said folds 9, 10, 11, 12, 13, 14 . . . ).
Dependencies are inferred from the claim text.