| 摘要 |
PURPOSE:To omit a dwell process and shorten a molding cycle, by shaping in a cavity a well part of which the volume expands due to an injection pressure and contracts due to an elastic force as the injection pressure vanishes and shutting a runner after filling with an injection. CONSTITUTION:A well part 14 is shaped at the tip of the pin 12 and a sprue 5 is provided so as to slide up and down and a rotation stopper is attached to it. The resin is filled in a cavity 11 by contacting an injection nozzle 2 to the sprue 5, pushing down the sprue 5 and a cavity block 15 and opening the passage of a runner 17. When the injection nozzle 2 parts from the sprue 5, the block 15 and the sprue 5 are pushed up by the acting force of a spring 16 and the runner 17 is shut at the side of the block 15. The well part 14 contracts due to the acting force of the spring 13 of the back end of the pin 12 and a pressure supplement to the shrinkage sink of the cavity 11 is done. |
