Multilayer preform used for plastic blow molding and method...

B - Operations – Transporting – 32 – B

Patent

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B32B 27/36 (2006.01) B29B 11/06 (2006.01) B29C 45/14 (2006.01) B29C 49/00 (2006.01) B29C 49/02 (2006.01) B29C 49/22 (2006.01) B29C 69/00 (2006.01) B65D 1/00 (2006.01) B65D 1/02 (2006.01) B29C 51/02 (2006.01) B29C 51/08 (2006.01)

Patent

CA 2170039

A multilayer preform (26a, 26b, 26c) used for plastic blow molding and a method for making the preform provides an inner layer (28) of polyethylene naphthalate and an infection molded outer layer (30) of polyethylene terephthalate which has reduced transmission of gas upon blow molding as a container due to the gas barrier provided by the inner layer of polyethylene naphthalate. The inner layer (28) of polyethylene naphthalate by itself or along with a further inner layer (32) of virgin polyethylene terephthalate is thermoformed prior to the injection molding of the outer layer (30) of polyethylene terephthalate. A minimal amount of the polyethylene naphthalate which is relatively expensive can be utilized due to die thermoforming and injection molding as disclosed.

L'invention concerne une préforme (2a, 26b, 26c) comportant des couches multiples et servant à souffler un objet en plastique, ainsi qu'un procédé de fabrication de la préforme. Ladite préforme comprend une couche intérieure (28) en polyéthylène naphtalate et une couche extérieure (30) moulée par injection en polyéthylène téréphtalate possédant la caractéristique de limiter la transmission de gaz lorsqu'on effectue le soufflage pour former un récipient du fait de la barrière de gaz constituée par la couche intérieure en polyéthylène naphtalate . La couche intérieure (28) en polyéthylène naphtalate, seule ou combinée à une autre couche intérieure (32) en polyéthylène téréphtalate vierge, est thermoformée avant le moulage par injection de la couche extérieure (30) en polyéthylène téréphtalate. On peut utiliser une quantité minimum de polyéthylène naphtalate, relativement cher, grâce au thermoformage et au moulage par injection décrits par l'invention.

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