Improvements relating to containers

Details Improvements relating to containers Improvements relating to containers

B - Operations, Transporting

29

C

B29C 49/54 (2006.01) B29C 49/06 (2006.01)

Patent

CA 2238874

A container is made in two stages from material such as thermoplastics that is deformable when heated. In the first stage a preform (1) is injection moulded, the mould parts easily releasing a tubular body (2) with a closed end. In the second stage the still heated preform (1) is blow moulded, possibly with some preliminary mechanical stretching, the blow pin being applied to the open end. The closed end of the body is stretched over a multi-part section (7, 8) of the mould which shapes the base of the container into an indent with an undercut formation, the cross section being generally omega-shaped. The multi- part mould section has a central tapered core (8) surrounded by an array of segments (7), the core (8) being fully inserted to spread the segments (7) for moulding, and being retracted to allow the segments (7) to close up and release the container after moulding. The divisions (12) between segments (7) produce ribs in the indent which provide added strength.

Un récipient est fabriqué en deux étages à partir d'une matière telle qu'une ébauche (1); les éléments du moule libèrent facilement un corps tubulaire (2) dont une extrémité est fermée. A la deuxième étape, l'ébauche (1), qui est encore chaude, subit un moulage par soufflages, éventuellement après un allongement mécanique préalable. Le mandrin de soufflage est placé dans l'extrémité ouverte. L'extrémité fermée est étirée sur une partie à plusieurs éléments (7, 8) du moule qui donne à la base la forme d'un renfoncement avec une formation en contre-dépouille, la section étant sensiblement en forme d'oméga. La partie du moule à plusieurs éléments a un noyau central conique (8) entouré par un ensemble de segments aux fins de moulage, puis retiré pour leur permettre de resserrer et de libérer le récipient après le moulage. Les séparations (12) entre les segments (7) forment des nervures dans le renfoncement, ce qui augmente la résistance.

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