Cylindrical sleeve structure, particularly cover for an...

B - Operations – Transporting – 41 – N

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101/119, 117/161

B41N 7/00 (2006.01) B29C 35/18 (2006.01) B29C 44/12 (2006.01) B41F 13/08 (2006.01) B41N 10/02 (2006.01)

Patent

CA 2012376

A cover layer, for example applied to a carrier sleeve (3), is volume compressible by being formed as a unitary seamless cover layer (3) of foamed or expanded or blown material resulting in micropores or microcells of less than 0.01 mm, with a ratio of closed or individual cells to open cells being greater than 50%. This cover layer will have a bounce-back or rebound elasticity of greater than 95% and preferably has a thickness of between about 1 to 5 mm. It may be covered with a polyurethane or rubber based outer cover layer of, for example, about less than 0.5 mm thickness. The cover layer is applied by providin a base substance which is made thixotropic, stirring it and applying it in liquid form as a spiral stripe on a rotating and axially moving cylinder (5), the material being free foaming and curing as it is being applied, and when still in spreadable and somewhat flowable condition to form a uniform seamless cover layer which includes individual, unconnected micropores or microcells. Additives such as talcum, and suitable selection of curing agents or activators and inhibitors, as well as blowing agents can control the size and eventual density of the material.

Une couche de revêtement, appliquée par exemple à l'enveloppe d'un véhicule (3), est compressible en volume en formant une couche de revêtement homogène sans soudure (3) de matière expansée ou cellulaire, avec des micropores ou des microcellules de moins de 0,01 mm, le rapport cellules fermées ou individuelles/cellules ouvertes étant supérieur à 50 %. Cette couche de revêtement aura une élasticité par rebond de plus de 95 %, et une épaisseur de 1 à 5 mm de préférence. Ladite couche peut être recouverte d'une pellicule de revêtement externe en polyuréthane ou en caoutchouc, de moins de 0,5 mm environ d'épaisseur. La couche de revêtement est obtenue à partir d'une substance de base rendue thixotrope, appliquée sous forme liquide, après brassage, en bande hélicoïdale sur un cylindre rotatif tournant autour de son axe (5); le produit est à expansion libre et durcit à mesure qu'il est appliqué en formant, pendant qu'il est encore étalable et un peu fluide, une couche de revêtement homogène sans soudure, renfermant des micropores ou des microcellules non connectées. Il est possible de contrôler la texture et peut-être même la densité du produit en ajoutant des additifs comme le talc, ainsi que certains agents de réticulation, activateurs, inhibiteurs ou agents d'expansion.

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