| 摘要 |
PROBLEM TO BE SOLVED: To prevent abnormal abrasion of a heating cylinder and also improve a plasticizing capacity. SOLUTION: In an in-line screw injection molding machine, a screw 34 which is inserted in a heating cylinder 30 is divided into three sections of a feed zone 341, a compression zone 342 and a metering zone 343, and is composed to use as both preplasticization and injection of resin. The feed zone 341 is composed of a first feed part 341A increasing as going from the opposite point of a hopper 31 to the compression zone 342 side in the depth of a screw groove 341B, a second feed part 341C in which there is formed a screw groove 341D reaching the beginning edge of the compression zone 342 from the end of the first feed part 341A in a groove depth corresponding to the depth of the screw groove 341B positioned at the end of the first feed part 341A, and a third feed part 341E having a screw groove 341F of the groove depth corresponding to the depth of the screw groove 341B positioned at the beginning edge of the first feed parts 341A on the opposite point to the hopper 31.
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