| 摘要 |
PROBLEM TO BE SOLVED: To upgrade the precision and the properties of a product to be molded by making the flow of a resin from a gate to a product cavity more uniform than in a conventionally way. SOLUTION: The interior of a valve body 26 incorporating a valve pin 36 which opens/closes a gate 14 serves as a passageway 28 for a material. A plurality of support blades 29 which come into contact, in a freely slidable manner, with the outer peripheral face of the valve pin 36, are radially and spirally formed on the inner peripheral face of the passageway 28 at the tip part of the valve body 26. In addition, a passageway 31 for a split material with a larger width than the support blade 29 is formed between the support blades 29. The passage 28 for a material is formed into a columnar-shape part 32 at the part on the gate 14 side instead of at the support blade 29. The flow of a molding material is stirred in the passageway part 31 for a split material by making the width of the passageway 31 large and making the molding material confluent at the columnar-shape part 32 and further, twisting the support blade 29 helically. Thus the flow of the molding material is hardly deflected.
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