Bonded synthetic-resin filter plate and method of making same

Details Bonded synthetic-resin filter plate and method of making same Bonded synthetic-resin filter plate and method of making same

1987-01-30

1988-04-26

Dawson, Robert A.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

156290, 1563071, 1563084, 1563099, 156322, 21050036, 428517, B32B 704, B32B 2728

Patent

active

047404132

ABSTRACT:
A thermoplastic polyolefin substrate, preferably polyethylene or polypropylene, is joined to an ethylene-propylene polymer, preferably an ethylene-propylene-diene elastomer, by first locally preheating only selected portions of the surface of the thermoplastic substrate while maintaining the rest of the surface and of the substrate at a substantially lower temperature, then applying to substantially the entire surface of the substrate an unvulcanized layer of the ethylene-propylene polymer, and finally heating the elastomer layer and thermoplastic substrate to the vulcanization temperature of the polymer to vulcanize and/or cross-link same and to unitarily bond the layer and substrate together on the surface at the selected portions thereof but not on the surface between the selected portions. Thereafter the polymer layer and thermoplastic substrate are cured by cooling. A filter plate for a press filter can be made with this method.

REFERENCES:
patent: 3342729 (1967-09-01), Strand
patent: 3351495 (1967-11-01), Larsen et al.
patent: 3532592 (1970-10-01), Kraus et al.
patent: 4302270 (1981-11-01), Nicolet
patent: 4332858 (1982-06-01), Saitoh et al.
patent: 4424253 (1984-01-01), Anderson

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