| 摘要 |
PURPOSE:To obtain a diodegradable resin foam excellent in quality by a method wherein both the water under heat and pressure and biodegradable resin are brought into existence under fluid state in a molding space, which is made openable and closable by a movable part and a fixed part, and, after that, by instantaneously releasing the molding space through the movement of the movable part, water content is evaporated. CONSTITUTION:An injection molder B such as an in-line screw type one, in which the movable part 3B of a mold 3 can take the opened position 51, the airtightly closed position 52, the released position of airtightness 53 and the opened position 51 in succession, is employed. Under the condition that water content is brought in biodegradable resin pellet being made into existence by proper method such as the inclusion of the water content in advance or the like, the pellet is fed through a hopper 11 into a cylinder and turned into fluid matter. By moving the movable part to the released position of airtightness 53, after the fluid matter is injected in the molding space 34 of the mold, the pressure in the molding space 34 is rapidly reduced through a communicating hole 42, instantaneously evaporating the water content and expanding the resin so as to obtain the foam having the predetermined shape. |
