| 摘要 |
PROBLEM TO BE SOLVED: To provide an injection molding machine capable of easily impregnating a molten resin molten and kneaded by the rotation of a screw with a gas of a gaseous state at a normal temperature/normal pressure from a gas supply port provided at the screw, surely preventing the gas from being leaked from the machine even by rotating the screw at a high speed, and assuring sealability of a sealing material for a long time without complicating the structure of the molding machine itself. SOLUTION: The injection molding machine comprises a screw rod 3a, and the sealing member 6 in such a manner that the contact side surface of the rod 3 with the member 6 is covered with a chromium oxide film 39. In this case, a dynamic frictional coefficient measured by a method according to ASTM E-1911-98 of the surface of the chromium oxide film becomes 0.03 or less.
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