D - Textiles – Paper – 21 – G
Patent
D - Textiles, Paper
21
G
D21G 1/02 (2006.01)
Patent
CA 2250126
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 a roll core base and cover. The compressive layer has the properties of being rigid enough to allow the cover to be applied to the roll, and compressible enough to deform and absorb the stresses which occur as the cover is shrinking during processing. In one embodiment, the compressive layer is separately cast with the cover over a disposable inner mold so as to form a composite roll cover. The composite roll cover is fitted over a roll core base and the resulting circumferential cavity is then filled with a thermoset resin.
La présente invention, qui vise à résoudre le problème de la perte de volume par effet chimique ou thermique des gaines dures de cylindres, consiste à inclure une ou plusieurs couches de compression intercalaires entre l'âme du cylindre et la gaine. De telles couches de compression ont la propriété d'être suffisamment rigides pour en permettre l'application sur le cylindre, et d'être suffisamment compressibles pour se déformer et absorber les contraintes qui s'exercent au fur et à mesure de la perte de volume de la gaine. Un mode de réalisation consiste d'abord à réaliser une gaine composite en coulant à part la couche de compression en même temps que la gaine autour d'une forme interne perdue, puis à placer la gaine composite sur le cylindre, et ensuite à combler le vide intercalaire par une résine thermodurcissable.
Paasonen Jan A.
Staudenmeier Bertram
Smart & Biggar
Stowe Woodward L.l.c.
Sw Paper Inc.
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