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AssigneeSekisui Chemical Co., Ltd.
InventorsSatoshi Shimura, Hitoshi Kawauchi, Hiroyuki Hirano
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The invention provides a molding apparatus adapted to use a screw having an overall length permitting the use of an existing molding machine cylinder as it is, and is capable of realizing a gas impregnation step. The screw 3 for use in the gas impregnation step comprises a resin melting portion C disposed at an upstream position for rendering the resin molten, a molten resin nonfilled-up portion E integral with the downstream side of the resin melting portion C for making the resin lower than an inert gas at a gas supply opening 5 in pressure, and a gas impregnation portion D integral with the downstream side of the molten resin nonfilled-up portion E for supplying the inert gas and impregnating the molten resin with the inert gas.
An apparatus for use in practicing a molding process for producing molded articles of thermoplastic resin which comprises the gas impregnation step of supplying an inert gas from a gas supply opening to a thermoplastic resin rendered molten by the rotation of a screw within a molding machine cylinder to impregnate the molten resin with the inert gas, and the molding step of obtaining an expansion-molded article from the gas-impregnated molten resin,
Dependencies are inferred from the claim text.