| 摘要 |
PROBLEM TO BE SOLVED: To achieve an operation of smooth advancement of a plunger without offset load on the plunger at the time of injection by providing an uniform shape of the front surface of the plunger and by supplying a molten resin to a plunger chamber through a groove provided on the axial core of the plunger. SOLUTION: A resin is supplied to a plasticization cylinder 6, measured, and melted to thereafter pass through the front edge portion of a screw to a communication path 7. A plunger 2 is then rotated to face the opening 4 of the plunger side surface of a groove 3 with the opening of the plunger side of the communication path 7, and the molten resin is supplied through the groove 3 to a plunger chamber 5. Either one of the opening of the plunger side surface of the groove 3 or the opening of the plunder side of the communication path 7 has a long hole, which can be applicable to any positioning. When the plunger 2 advances in the heating cylinder 1, uniform pressure is applied to the front surface of the plunger 2, so as to achieve straight advancement of the plunger 2 without any offset load on the plunger 2.
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