Injection molding process and injection molding apparatus...

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 45/18 (2006.01) B29C 44/02 (2006.01) B29C 44/34 (2006.01)

Patent

CA 2402620

An object of the invention is to provide an injection molding process for preparing thermoplastic resin molded articles and an injection molding apparatus for use in practicing this process, the process and the apparatus being adapted to supply a blowing agent, especially a nonreactive gas such as carbon dioxide or nitrogen gas, to a thermoplastic resin continuously at a relatively low pressure with good stability to incorporate the agent or gas into the resin. As shown in FIG. 3, a resin in a cylinder (2) of an injection molding machine (1) as melted by rotating a screw (3) is mixed and dissolves carbon dioxide which is supplied to the molten resin from a gas supply opening (5) formed in the screw (3). An amount of the gas-incorporating molten resin is measured out and injected into a mold cavity to obtain an expansion-molded article. To incorporate carbon dioxide into the molten resin, the gas is supplied from a gas inlet (11) formed in a rear end portion of the screw to a portion (4a) not fed with the resin and positioned between front and rear screw flights and closer to the front flight, through a gas supply channel 6 extending through the screw and via the supply opening (5).

L'invention concerne un procédé de moulage par injection d'un produit formé en résine thermoplastique. Le procédé consiste à injecter un agent moussant (p. ex. un gaz non réactif tel qu'un gaz carbonique ou un azote gazeux), depuis un orifice d'alimentation en gaz (5) ménagé dans une vis (3), dans une résine formée à l'état fondu par rotation de la vis (3) dans un cylindre (2) d'une machine à mouler par injection (1), de manière à mélanger et imprégner la résine fondue avec l'agent moussant. Le procédé consiste ensuite à mesurer la résine fondue imprégnée de l'agent moussant ainsi obtenue, et à injecter la résine dans la cavité d'un moule métallique. L'agent moussant est injecté, depuis un orifice d'entrée de l'agent moussant (11) pratiqué sur la partie arrière de la vis (3) à travers un conduit d'alimentation en gaz (6) ménagé à l'intérieur de la vis (3) et l'orifice d'alimentation en gaz (5), dans une partie non remplie de résine (4a) plus près d'un filet latéral avant situé entre les filets avant et arrière, de manière à imprégner la résine fondue avec l'agent moussant, ce qui permet d'obtenir un produit formé moussant.

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