Expansion injection molding process and mold for expansion...

Details Expansion injection molding process and mold for expansion... Expansion injection molding process and mold for expansion...

B - Operations, Transporting

29

C

B29C 45/00 (2006.01) B29C 45/26 (2006.01)

Patent

CA 2587223

[PROBLEMS] To provide an expansion injection molding process which is freed from the occurrence of swirl marks on the surface of a molded article and by which foamed injection moldings having good appearance can be produced in a short molding cycle and at a low cost; and a mold for expansion injection molding. [MEANS FOR SOLVING PROBLEMS] A force side part (2) of mold is moved toward a cavity side part (1) of mold, whereby a sealing member (6) set on at least one of a pair of facing surfaces of the parts (1) and (2) in the outside of a cavity (3) is brought into contact with the other of the facing surfaces or a sealing member (6) set thereon to make the cavity (3) sealed against gas. While keeping the gas-sealed state, the force side part (2) is further moved toward the cavity side part (1) with the sealing member (6) compressed, whereby the volume of the cavity (3) is decreased to enhance the pressure in the cavity (3) to a level exceeding the atmospheric pressure. Then, a thermoplastic resin is injected into the cavity (3) of an enhanced pressure.

L~invention entend proposer un procédé de moulage par expansion et injection exempt de l~apparition de marques de tourbillon à la surface d~un article moulé et permettant de fabriquer des pièces moulées par injection et expansion de bon aspect, dans un court cycle de moulage et à faible coût ; et un moule pour moulage par expansion et injection. Une pièce latérale de force (2) de moule est rapprochée d~une pièce latérale de cavité (1) de moule, un élément d~étanchéité (6) posé sur au moins l~une d~une paire de surfaces en regard des pièces (1) et (2) à l~extérieur d~une cavité (3) étant ainsi mis en contact avec l~autre des surfaces en regard ou un élément d~étanchéité (6) posé dessus pour rendre la cavité (3) étanche au gaz. Tout en préservant l~état étanche au gaz, la pièce latérale de force (2) est rapprochée encore de la pièce latérale de cavité (1) avec l~élément d~étanchéité (6) comprimé, tandis que le volume de la cavité (3) décroît pour augmenter la pression dans la cavité (3) à un niveau supérieur à la pression atmosphérique. Ensuite, on injecte une résine thermoplastique dans la cavité (3) d~une pression accrue.

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