| 摘要 |
PROBLEM TO BE SOLVED: To satisfactorily continuously mold by providing a plurality of partition plates in an air gap to divide the gap for feeding a cooling medium of no liquid in the same direction as a lengthwise direction of a sprue bush. SOLUTION: An air gap is formed between the mold 7 and an outer periphery of a sprue bush 13 when the bush 13 is inserted by cutting the mold 7. The gap is divided to air gaps 11, 12 by providing two partition plates 15 outside the bush 13. The plates 15 are cut out at parts near an innermost parting surface from fluid exits/entrances 18, 19 provided at an injection molding machine side of the bush 13 so that the fluid is passed from this part to pass the gaps 11, 12. Further, a plurality of protrusions and recesses 14 are formed on an outer periphery of the bush 13 to increase surface area of the outer periphery of the bush 13. A resin yield is improved by fins.
|
