Integral two layer preform, process and apparatus for the...

B - Operations – Transporting – 29 – B

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B29B 11/14 (2006.01) B29C 45/16 (2006.01) B29C 49/22 (2006.01) B65D 25/14 (2006.01) B65D 77/06 (2006.01) B29C 49/06 (2006.01)

Patent

CA 2681777

The invention is an integral two-layer preform (1) for the production of integrally blow- moulded bag-in-containers (2). The preform has an inner layer (11) and an outer layer (12), wherein the preform forms a two layer container upon blow-moulding, and wherein the thus obtained inner layer of the containerreleases from the thus obtained outer layer upon introduction of a gas at a pointof interface of the two layers. The melting temperature of the inner layer is greater than or equal to the melting temperature of the outerlayer.

La présente invention concerne une préforme à deux couches (1) d'un seul tenant pour la production d'une caisse-outre (2) moulée par soufflage d'un seul tenant. La préforme présente une couche interne (11) et une couche externe (12), la préforme formant une caisse à deux couches après moulage par soufflage, et la couche interne ainsi obtenue de la caisse se séparant de la couche externe ainsi obtenue lors de l'introduction d'un gaz à un point d'interface des deux couches. La température de fusion de la couche interne est supérieure ou égale à la température de fusion de la couche externe.

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