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US 4,303,721 AGranted
Closed cell foam printing blanket
AssigneeW. R. Grace & Co.
InventorJorge M. Rodriguez
Life of this patent
Estimating the term…
Abstract
A new resilient compressible printing element having a rubber layer with foamed closed cells therein. The closed cells are formed by the use of blowing agents which are activated and foam the material while an external pressure is applied to the material to restrict expansion.
Claims6
A resilient compressible offset printing blanket of the type comprising
- (a) a base layer comprising a member chosen from the group consisting of a machine direction, elongation stabilizing material and an adhesive material;
- (b) a compressible layer over said base layer and comprising foamed rubber having a substantially closed celled structure;
- and
- (c) an ink transfer face layer over said compressible layer,
- the improvement comprising said resilient compressible offset printing blanket being free of any intervening woven stabilizing layer between the foamed rubber compressible layer and the face layer while having means giving the substance of the stability that would be provided by such a woven stabilizing layer between the foamed rubber compressible layer and the face layer.
2 more elements
Dependencies are inferred from the claim text.