Multilayer bottle with separable inner layer

B - Operations – Transporting – 65 – D

Patent

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Details

B65D 83/62 (2006.01) B29C 45/16 (2006.01) B29C 49/22 (2006.01) B65D 1/02 (2006.01) B65D 23/02 (2006.01) B65D 83/00 (2006.01) B67D 1/04 (2006.01) B29C 49/06 (2006.01)

Patent

CA 2100758

A multilayer plastic container (50) for use with either a positive or negative pressure dispensing system (10), the container having an integral body with an inner layer (58) which readily separates from an outer layer (59) and collapses to dispense a product from the container. The container is formed by blow-molding a multilayer preform, and a bottom aperture (57) is formed in the container for injecting air to separate the inner layer from the outer layer. Preferably, the inner layer is predelaminated during manufacture to facilitate its later separation during use. In the case of vacuum dispensing, air inlet vent holes are preferably formed at the points of maximum deformation to prevent collapse of the outer layer.

L'objet de la présente invention est un contenant en plastique multicouches (50) pouvant être utilisé avec un système de distribution à pression négative ou positive (10); le contenant en question comporte un corps intégral et une couche intérieure contractile (58) qui se vide de son contenu en s'éloignant de la couche extérieure (59). Le contenant en question est moulé par soufflage d'une préforme multicouche; une ouverture pratiquée à travers le fond (57) du contenant permet l'injection d'air qui servira à séparer la couche intérieure de la couche extérieure. De préférence, la couche intérieure est délaminée à l'avance au cours du procédé de fabrication afin d'en faciliter la séparation ultérieure pour les besoins de l'utilisation. Pour les systèmes de distribution à dépression, des orifices d'admission d'air sont percés aux points de déformation maximale du contenant afin de prévenir la contraction de la couche extérieure.

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