| 摘要 |
PROBLEM TO BE SOLVED: To provide the backflow preventing device of an injection molding machine capable of preventing the abrasion of a friction ring or a backflow preventing ring. SOLUTION: The backflow preventing device of the injection molding machine comprises the backflow preventing ring 4 provided between a screw 5 and the screw head 1 provided to the leading end of the screw 5 in a movable manner and the friction ring 2 with which the backflow preventing ring 4 is brought into contact. A diamond sintered layer 7 with a surface roughness Ra of 0.05μm or below is formed to the contact surface of the friction ring 2 with the backflow preventing ring 4. COPYRIGHT: (C)2007,JPO&INPIT
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