Sealing arrangement for a double band press
First Claim
1. Double band press for pressing a continuously running sheet material comprising a rigid press frame, bearing supports mounted on said press frame, reversing drums mounted in said bearing supports and arranged as at least one pair of spaced upper drums and at least one pair of spaced lower drums, an upper endless press belt entrained around said upper drums and a lower endless press belt entrained around said lower drums, each said press belt having an outer surface and an inner surface with said outer surfaces disposed in facing relationship forming a reaction zone therebetween through which the sheet material passes a pressure plate located within each said press belt and extending in the direction between said reversing drums, said pressure plates spaced closely from the inside surfaces of said press belts adjacent to said reaction zone, said pressure plates each having a surface facing the associated inner surface of said press belt and said surface being bordered by an edge, a groove formed in said surface of said pressure plate and spaced inwardly from said bordering edge, a sliding seal located within said groove and extending out of said groove into contact with said inner surface of the associated said press belt, means within said groove for pressing said seal against the inner surface of said press belt, the combination of the surface of said pressure plate facing the inner surface of the associated said press belt and said sliding seal forming a pressure chamber, fluid pressure means within said pressure chamber for pressing said press belt toward said reaction zone, wherein the improvement comprises that said sliding seal comprises a body formed of metal located within said groove and being displaceable within said groove toward the inner surface of the associated press belt, said sliding seal having a first surface facing the inner surface of said press belt, a dry metal layer forming the first surface of said sliding seal and arranged to engage the inner surface of said press belt in sliding contact, said dry metal layer is supported on said body and is formed of a different metal than said body.
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Accused Products
Abstract
A double band press is used for processing a continuous sheet material passing through the press. The press includes a rigid press frame including reversing drums mounted in bearing supports on the frame. An upper and a lower endless press belt run over different ones of the drums and each press belt in combination with a pressure plate and sliding seal form a pressure chamber for exerting pressure against a reaction zone located between adjacent runs of the press belts. The sliding seal is positioned within a groove in the pressure plate and is displaceable and is pressed toward the inner surface of the press belt. A fluid pressure medium in the pressure chamber provides the pressing action on the press belt. The sliding seal includes a metal body with a surface facing the inner surface of the press belt and a dry surface layer is provided in the surface facing the press belt so that the dry surface layer is in sliding frictional contact with the press belt.
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Citations
11 Claims
- 1. Double band press for pressing a continuously running sheet material comprising a rigid press frame, bearing supports mounted on said press frame, reversing drums mounted in said bearing supports and arranged as at least one pair of spaced upper drums and at least one pair of spaced lower drums, an upper endless press belt entrained around said upper drums and a lower endless press belt entrained around said lower drums, each said press belt having an outer surface and an inner surface with said outer surfaces disposed in facing relationship forming a reaction zone therebetween through which the sheet material passes a pressure plate located within each said press belt and extending in the direction between said reversing drums, said pressure plates spaced closely from the inside surfaces of said press belts adjacent to said reaction zone, said pressure plates each having a surface facing the associated inner surface of said press belt and said surface being bordered by an edge, a groove formed in said surface of said pressure plate and spaced inwardly from said bordering edge, a sliding seal located within said groove and extending out of said groove into contact with said inner surface of the associated said press belt, means within said groove for pressing said seal against the inner surface of said press belt, the combination of the surface of said pressure plate facing the inner surface of the associated said press belt and said sliding seal forming a pressure chamber, fluid pressure means within said pressure chamber for pressing said press belt toward said reaction zone, wherein the improvement comprises that said sliding seal comprises a body formed of metal located within said groove and being displaceable within said groove toward the inner surface of the associated press belt, said sliding seal having a first surface facing the inner surface of said press belt, a dry metal layer forming the first surface of said sliding seal and arranged to engage the inner surface of said press belt in sliding contact, said dry metal layer is supported on said body and is formed of a different metal than said body.
Specification