| 摘要 |
PURPOSE:To obtain a complete molded product economically, by a method wherein a large quantity of a predetermined quantity of resin is extruded to a molding mold in a short period of time by enlarging a bore of an extrusion port and accumulated residual resin is pressed into a pressing-in resin chamber. CONSTITUTION:Resin A is kept stored within an extrusion chamber 3 whose extrusion port 5 is closed, when a reed valve 2 is opened, a thermally-plasticized resin and another resin are supplied newly within an extrusion chamber 3 respectively through an extrusion machine 1 and auxiliary chamber 15, through which a plunger 10 is moved backward. Primary extrusion of the stored resin A controlled to a low temperature into a space 9 within a mold is performed in succession by a predetermined quantity through an extrusion path 7 by moving the plunger 10 forward and opening the extrusion port 5 and extrusion path 7 by moving a mandrel 11 backward. Subsequently, the mandrel 11 is moved forward, high-pressure pressing is applied to a residual dwell resin B, thereby being pressed into the space 9 within the mold of a molding mold. An industrial molded product of a reinforced nylon resin whose cooling period of time is sufficient can be obtained like this. |
