| 摘要 |
PROBLEM TO BE SOLVED: To reduce a frictional resistance to be applied to a resin in an injecting step. SOLUTION: The injection device comprises a heating cylinder 11 having a resin supply port 15 formed at a predetermined position, a screw having a flight part formed with a flight on the outer periphery of a screw body and a screw head arranged on the front end of the flight part to be rotatably arranged in such manner as to be freely advanced and retracted in the cylinder, and a hopper 16 mounted in the port 15 to supply a resin into the cylinder 11. A protrusion 81 protruded toward the port 15 is formed at the front end of the port 15. In this case, he resin dropped form the hopper 16 is deflected toward rearward by the protrusion 81 in the case of passing the port 15. The resin supplied in to the cylinder 11 through the port 15 is prevented from being sandwiched between the flight and the cylinder 11.
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