Process and device for producing cross-linked polyolefin foams

Details Process and device for producing cross-linked polyolefin foams Process and device for producing cross-linked polyolefin foams

B - Operations, Transporting

29

C

B29C 44/34 (2006.01) B29C 35/06 (2006.01) B29C 35/04 (2006.01)

Patent

CA 2319591

Furnaces for cross-linking and foaming polyolefin plates or foils having several successive zones associated each with a foil heating device are known. The aim of the invention is to enable cross-linked polyolefin foams to be produced in a more economical manner. According to the disclosed process, hot air flows past the polyolefin plate or foil against its transport direction. The disclosed device (24) for heating the polyolefin plate or foil (2) is arranged and designed in such a way that the hot air (25) leaving the device (24) flows parallel to the plate or foil plane (26). The device for heating the polyolefin plate or foil (2) is preferably a heating tunnel (30) which encloses the plate or foil (2).

On connaît des fours destinés à la réticulation et au moussage de plaques ou feuilles de polyoléfine. Ces fours présentent plusieurs zones successives, chacune associée à un dispositif de chauffage de la feuille. L'invention a pour objet de permettre la production économique de mousses en polyoléfine réticulée. Selon le procédé de l'invention, de l'air chaud afflue sur la plaque ou la feuille de polyoléfine dans le sens inverse du sens de transport de cette plaque ou feuille. Selon l'invention, le dispositif (24) destiné à chauffer la plaque ou la feuille de polyoléfine (2) est conçu de telle façon que l'air chaud (25) sortant du dispositif (24) afflue parallèlement au plan de la plaque ou de la feuille (26). De préférence, le dispositif de chauffage de la plaque ou de la feuille de polyoléfine (2) est un tunnel de chaleur (30) entourant la plaque ou la feuille (2).

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