| 摘要 |
PROBLEM TO BE SOLVED: To provide an injection molding machine that can plasticize a thermosetting resin without changing the properties of the resin and can stably manufacture a high quality thermosetting resin molding.SOLUTION: A spiral groove 15 that continues from a position corresponding to a raw material introduction hole 14 formed in a heating cylinder 5 to a tip portion thereof is formed in an outer surface of a screw 11A. A formation range of the spiral groove 15 is composed of a transfer area A, an aggregation area B, and a plasticization area C, arranged in this order from the raw material introduction hole 14 side. A spiral groove 15a formed in the transfer area A has a shape capable of transferring a raw material, supplied from a hopper, to the aggregation area B without compression. A spiral groove 15b formed in the aggregation area B has a shape capable of suppressing a pressure acting on the raw material in comparison with the case where a lead pitch, a groove width, and a groove depth are set constant. A spiral groove 15c formed in the plasticization area C has a shape capable of suppressing shearing heat generation and friction heat generation in comparison with the case where a lead pitch, a groove width, and a groove depth are set constant.SELECTED DRAWING: Figure 2 |
