Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Patent
1995-04-06
1997-02-11
Ryan, Patrick
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
428 68, 428 71, 428 76, 428155, 428372, 428377, 428382, 428383, 428390, 4284258, 428461, 427195, 427318, 427358, 264 469, 264225, B32B 900
Patent
active
056019203
ABSTRACT:
The problems caused by chemical and thermal shrinkage of hard roll covers, are reduced by the inclusion of one or more intermediate compressive layers between the metal roll and the outer cover, or "topstock". A compressive layer has the properties of being rigid enough to allow the cover to be applied to the roll, and compressible enough to buffer and absorb the stresses which occur as the cover is shrinking during processing.
In one embodiment, the intermediate compressive layer comprises a three dimensional fabric that is filled preferably with a thermoset resin system which cures at lower temperature than cover. In a second embodiment, the precise amount of shrinkage in the roll can be predetermined to a high enough degree of accuracy so that a depth for the fabric layer can be used to compensate for the amount of shrinkage, thereby eliminating the need for filling. In a third embodiment, the compressive layer is comprised of a wax material.
The problems caused by chemical and thermal shrinkage are further reduced through a method based on applying a polymeric cover layer over one or more intermediate compressive layers, curing at an elevated temperature, and, allowing the cover to shrink during curing or hardening.
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patent: 5376448 (1994-12-01), Suzuki et al.
Paasonen, "The Role of Composite Roll Covers in Soft and Super Calendering" Oct. 1993.
Grenoble Atria World Trade Center Europole, (Atip Publication).
Paasonen Jan A.
Ylisel a Seppo A.
Bahta Abraham
Ryan Patrick
Stowe Woodward Licensco, Inc.
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