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US 4,788,100 AGranted
Length of material, in particular for filtering, method for its manufacture and applicability
AssigneeThomas Josef Heimbach GmbH & Co.
InventorsEberhard Janssen, Willi Hunold
Life of this patent
Estimating the term…
Abstract
A filter fabric comprises a needle felt substrate comprised of a non-woven air permeable fabric having spaced surfaces. An open pour air permeable plastic foam is incorporated into the substrate and extends from one surface toward the other.
Claims18
A fabric for paper machines and the like, comprising:
- (a) a needle felt substrate comprised of a non-woven air permeable fabric having spaced surfaces;
- and,
- (b) an open pore air permeable plastic foam incorporated into said substrate and extending from one surface toward the other.
A filter fabric, comprising:
- (a) a bracing structure;
- (b) first and second non-woven air permeable fiber fabrics;
- (c) each fabric disposed along a side of said structure so that said structure is positioned between said fabrics;
- (d) means secure each of said fabrics to said structure for thereby forming an air permeable substrate;
- and,
- (e) an open pore air permeable plastic foam calendered into a first surface of said substrate and extending therein toward said structure.
3 more elements
The method of manufacturing a filter fabric, comprising the steps of:
- (a) providing a needle felt substrate comprised of a non-woven air permeable fabric;
- (b) depositing a supply of open pore air permeable plastic foam on a surface of the substrate;
- (c) completely pressing the foam into the substrate by calendering;
- and,
- (d) heating the substrate.
2 more elements
Dependencies are inferred from the claim text.