Method of partially engraving foamed plastic extrusions and...

B - Operations – Transporting – 29 – C

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B29C 59/04 (2006.01) B29C 47/00 (2006.01) C08J 9/12 (2006.01)

Patent

CA 2482500

A method of only partially engraving foamed plastic extrusions and foamed plastic extrusions so engraved, the method comprising formulating the plastic to leave residual foaming agents after extrusion and contacting one or both sides of the extrusion with an embossed engraving roller or rollers controlled to limit penetration and contact of the foamed plastic with the outer portions only of the roller embossment to activate residual foaming agents to foam the plastic around such penetrating portions.

Il s'agit d'une méthode qui consiste à graver seulement partiellement des pièces extrudées en mousse plastique, et des pièces extrudées en mousse plastique. Cette méthode comprend la formulation du plastique pour laisser des agents moussants résiduels après l'extrusion et la mise en contact d'un ou des deux côtés de la pièce extrudée avec une molette de gravure estampée. Ce procédé peut faire appel aussi à des molettes contrôlées pour limiter la pénétration et le contact de la mousse plastique avec les parties extérieures du grainage des molettes, pour que les agents moussants résiduels déclenchent le moussage du plastique autour de ces parties de pénétration.

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