Composite closures for containers

B - Operations – Transporting – 65 – D

Patent

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Details

B65D 55/06 (2006.01) B29C 65/10 (2006.01) B65D 43/10 (2006.01)

Patent

CA 2597765

Conventional adhesive and contact welding methods for holding the paperboard and plastic components of a composite closure together present a number disadvantages and do not lend themselves easily to mass production. The present invention describes two novel approaches, firstly the pre-assembly heating of the closure components with directed hot air to partially melt the thermoplastic surfaces and allow the parts to be immediately assembled sealingly and, secondly, a novel construction of plastic and paperboard composite closure in which the plastic rim is of a two-piece snap-fit constructions which firmly grips the top panel of the paperboard lid.

La présente invention concerne des fermetures composites pour conteneurs. Des procédés conventionnels de soudage par adhésif et contact destinés à maintenir ensemble les composants en carton et en plastique d~une fermeture composite présentent un nombre d~inconvénients et ne se prêtent pas facilement à la production en série. La présente invention décrit deux nouvelles approches, premièrement le chauffage avant montage des composants de la fermeture avec un air chaud dirigé pour faire partiellement fondre les surfaces thermoplastiques et permettre aux pièces d~être immédiatement assemblées de manière étanche et, deuxièmement, une nouvelle construction de fermeture composite en plastique et en carton dans laquelle le rebord en plastique est d~une construction en deux morceaux qui s~assemblent par pression qui saisit fermement le panneau supérieur du couvercle en carton.

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