VALVE GATE TYPE MOLD ASSEMBLY

摘要

PROBLEM TO BE SOLVED: To enhance the accuracy and characteristics of a product by uniformizing the flow of a molding material into a product cavity from a gate. SOLUTION: A valve device 11 has a valve casing 12 having a material passage 15 formed therein and provided with a band heater 16 being a heating means for heating the material passage 15 and a. valve pin 25 for opening and closing the gate 14 and a spiral guide groove 51 is formed to the material passage 43 on the side of the gate 14 communicating with the material passage 15. A resin is guided toward the spiral guide groove 51 and the flow of the resin is generated in a spiral direction to uniformize the flow of the resin sent from the material passage 15 and the resin becomes a flow including the force in the spiral direction to smoothly fill the product cavity 3.