Covered roll and a method for making the same

Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing

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428 365, 428 3691, 428 71, 428 76, 428372, 428382, 428390, 428461, 427195, 427318, 427358, 264 469, 264225, B32B 900

Patent

active

057801312

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 topstock to be applied to the roll, and compressible enough to buffer and absorb the stresses which occur as the topstock 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 topstock. 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 topstock layer over one or more intermediate compressive layers, curing at an elevated temperature, and, allowing the topstock to shrink during curing or hardening.

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patent: 4760232 (1988-07-01), Smith
patent: 5091027 (1992-02-01), Watanabe
patent: 5376448 (1994-12-01), Suzuki et al.
Paasonen; The Roll Of Composite Roll Covers In Soft And Super Calendering; ATIP Grenoble ATRIA World Trade Center Europole; (Oct. 20, 21 & 22, 1993).

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