Method for making plastic overcaps using hot runner...

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 45/27 (2006.01) A61J 1/00 (2006.01) B29C 45/00 (2006.01) B29C 45/23 (2006.01) B29C 45/40 (2006.01) B29C 45/43 (2006.01) B29C 45/44 (2006.01) B65D 41/16 (2006.01) B29C 45/28 (2006.01)

Patent

CA 2491505

The present invention is a method for making a plastic overcap (100) using a mold tool stack (10). The mold tool stack has a core (12) and a cavity plate (20) forming a cavity (22) therebetween. The core has a resin passageway (26) therein with a gate (24) in a top surface of the core. The gate has a valve (52) proximate the top surface of the core to regulate resin (28) flowing from the resin passageway and into the cavity. The steps of the mold method are as follows: the mold tool stack is closed to form the cavity; the valve is opened to allow resin to enter the cavity; the valve is closed; the resin is allowed to cool; and the mold tool stack is opened to allow removal of the plastic overcap from within the mold tool stack. The top side of the plastic overcap produced is blemish-free, facilitating placement of labels and other markings thereon.

L'invention concerne un procédé de fabrication d'un couvercle de surbouchage en plastique utilisant une pile d'outils de moule. La pile d'outils de moule comporte un noyau et une plaque de matrice formant entre eux une cavité. Le noyau présente une passage de résine et une entrée formée dans une surface supérieure du noyau. L'entrée comporte un obturateur à proximité de la surface supérieure du noyau pour réguler l'écoulement de résine, du passage dans la cavité. Le procédé comporte les étapes consistant à : fermer la pile d'outils de moule pour former la cavité ; ouvrir l'obturateur pour permettre à la résine de pénétrer dans la cavité ; fermer l'obturateur ; laisser refroidir la résine ; et ouvrir la pile d'outils de moule pour pouvoir retirer la couvercle de surbouchage en plastique de la pile d'outils de moule. La face supérieure du couvercle ainsi produit est exempte de défauts d'aspect, ce qui facilite la mise en place d'étiquettes et d'autres inscriptions sur celle-ci.

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