| 摘要 |
PROBLEM TO BE SOLVED: To provide an injection device which injects and charges a well mixed molding material in a mold for forming a molded product, suppresses the lowering of injection efficiency, keeps the physical properties and quality of the molded product, can be reduced in weight/size while imparting rigidity and enables low production. SOLUTION: The injection device is provided with a first stage injection unit, which as a hopper 6 in which a pellet like material 4 is charged, an injection part 10 for housing the material charged in the hopper, at least one heater part provided to the outer peripheral region of the injection part for melting the material and the injection screw part 14 housed in the injection part to inject the molten material, and a second stage injection unit, which has a hopper in which the material injected from the first stage injection unit is charged, an injection part for housing the material charged in the hopper, at least one heater part provided to the outer peripheral region of the injection part in order to melt the material and an injection screw part for injecting the molten material housed in the injection part, and constituted as a two-stage type screw in-line mechanism. In this case, the pitch of the spiral groove parts formed to the inner peripheral surface of the injection part of the second stage injection unit is gradually narrowed toward an injection side. COPYRIGHT: (C)2007,JPO&INPIT
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