| 摘要 |
PURPOSE:To beautifully finish the surface of a molded product and enhance design properties of a product by discharging gas from a cavity wall surface at the time of mold opening after injection molding the molded product by means of an air- permeable injection molding die and releasing the molded product from the molding die. CONSTITUTION:A core block 14 is formed with air-permeable resin and projecting curved surface 14a and a flat surface 14b are formed with an air permeable thin film 14c, while a cavity block 24 is of air-permeable resin and a recessing curved surface 24a and a flat surface 24b are also formed with permeable film 24c. Molten resin is filled in a cavity 50 and completely cooled and solidified, and compressed air is fed to a hollow section 26 simultaneously with mold opening. The compressed air passes through the cavity block 24 and is discharged out of the whole surface of the recessing curved surface 24a to press the surface of a movable mold 20 side of the molded product with almost uniform force and release the molded product from the cavity block 24. The molded product is adhered to the core block 14 of a fixed mold 10 and released. In case the molded product is adhered to the movable mold 20 at the time of mold opening, compressed air is fed into a hollow section 16 of the fixed mold 10. |
