An extruded/blow moulded bottle

B - Operations – Transporting – 32 – B

Patent

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Details

B32B 1/02 (2006.01) B29C 44/04 (2006.01) B29C 44/34 (2006.01) B29C 49/04 (2006.01) B29C 49/22 (2006.01) B32B 5/18 (2006.01) B65D 1/02 (2006.01) C08J 9/08 (2006.01)

Patent

CA 2290468

An extruded/blow moulded bottle, together with a process for producing the bottle. The bottle has a wall structure (10) comprising a layer (11) of foamed plastic material which is surrounded by outer, solid layers (12 and 13) of plastic of the same type as the plastic in the foamed layer (11). The material in the foamed layer (11) includes a rigid polymer component and a ductile polymer component in a mixing ratio of from 1:3 to 3:1, and in addition the foamed layer (11) constitutes at least 50% of the total weight of the bottle. The bottle is produced by a combined extrusion/blow moulding process in which granulate starting material including the two polymer components and a chemical CO2-generating blowing agent is melted and, under excess pressure, is forced through an annular nozzle during simultaneous expansion of the formed CO2 blisters. The formed, foamed hose is accommodated in a mould cavity and inflated with the aid of air at high pressure to the desired bottle configuration.

L'invention concerne une bouteille extrudée/moulée par soufflage ainsi que son procédé de fabrication. Cette bouteille a une paroi (10) composée d'une couche de mousse (11) en plastique enveloppée de solides couches extérieures (12 et 13) réalisées dans le même type de plastique que celui de la couche de mousse (11). Le matériau de la couche de mousse (11) comprend un constituant polymère rigide et un constituant polymère ductile dans un rapport de 1:3 à 3:1. La couche de mousse (11) représente au moins 50 % du poids total de la bouteille. La bouteille est produite selon un procédé mixte d'extrusion/moulage par soufflage, qui consiste à faire fondre le matériau de départ en granulés, contenant les deux polymères et un agent de gonflement chimique produisant du CO2, et à l'expulser, sous l'effet d'une surpression, par une buse annulaire pendant l'expansion simultanée des bulles de CO2 formées. Le tuyau en mousse ainsi produit est logé dans une empreinte de moule et, par insufflation d'air à forte pression dans ce tuyau, on obtient la configuration de bouteille souhaitée.

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