| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that a long time is needed for preparative work to cause the lowering of productivity when a material to be used in injection molding is changed. SOLUTION: In an injection molding machine in which a material 14 supplied from a hopper 8 is melted by a heating means, injected into a mold by an injection cylinder 1, and injection-molded, a plurality of the hoppers 8 are installed, each hopper 8 is moved to be connected alternately to the cylinder 1 so that the material 14 in each hotter 8 can be supplied selectively to the cylinder 1. A time for the preparative work to change the material 14 can be shortened remarkably to improve productivity.
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