Gas-assisted injection molding of thermosetting polymers

Details Gas-assisted injection molding of thermosetting polymers Gas-assisted injection molding of thermosetting polymers

B - Operations, Transporting

29

C

B29C 45/17 (2006.01) B29D 22/00 (2006.01)

Patent

CA 2467667

Thermosetting polymer (6) is introduced into a mold (1) at one end thereof to fill said mold (1, 5). After a predetermined length of time to permit the thermosetting polymer (6) to polymerize along the wall of the mold (1) to form a wall of the desired thickness, gas is introduced into said mold (1) at the opposite end (7) to eject the central unpolymerized portion of the thermosetting polymer (6) from the mold (1), leaving behind in the mold a hollow formed article.

Selon l'invention, un polymère thermodurcissable (6) est introduit dans un moule (1) au niveau d'une extrémité de ce dernier, de sorte à remplir ledit moule (1, 5). Après une période prédéterminée permettant au polymère thermodurcissable (6) de polymériser le long de la paroi du moule (1) pour former une paroi présentant une épaisseur désirée, du gaz est introduit dans ledit moule (1), au niveau de l'extrémité opposée (7), de sorte à expulser la partie non polymérisée centrale du polymère thermodurcissable (6) du moule (1), laissant ainsi dans le moule un article creux formé.

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