Filter medium and process for making same

Details Filter medium and process for making same Filter medium and process for making same

1995-09-12

1997-03-11

Walker, W. L.

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

2104934, 2104935, 55497, 55498, 55500, 55521, 55524, B01D 2706

Patent

active

056097611

ABSTRACT:
In a process for the production of a filter medium in particular in the form of a pleated bellows for a filter cartridge for dust separation, at least one surface of the filter medium is provided with an embossed structure, consisting of a multitude of raised embossed elements, preferably in the form of burls or ribs. Furthermore such surfaces of the filter medium are subjected to an additional treatment in the area of the embossed spots by application of a layer of a curable, dryable coating mass and/or heat so that an added mechanical resistance/strength/abrasion resistance is obtained in the area of these treated embossed parts. Due to this process for the production of a filter medium it is possible to create a filter medium--in particular one consisting of mechanically sensitive materials, e.g., thermoplastic materials or non-wovens made from synthetic fibers--which can be provided with an embossed structure on at least one of its surfaces for the purpose of ensuring a sufficient distance between the pleats of the filter cartridge during the cleaning process. At the same time wear and tear of the filter material is precluded at the spots where the pleats touch each other despite the raised parts created by embossing, i.e., in the area of the contact points material wear and abrasion of the filter material is prevented while the gas to be cleaned flows in and while the filter material is cleaned.

REFERENCES:
patent: 3419937 (1969-06-01), Bally
patent: 3531920 (1970-10-01), Hart
patent: 4046697 (1977-09-01), Briggs et al.
patent: 4310419 (1982-01-01), Nara et al.
patent: 4687697 (1987-04-01), Cambo et al.
patent: 5006400 (1991-11-01), Rocklitz et al.
patent: 5290447 (1994-03-01), Lippold

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