METHOD FOR PRODUCTION OF HOLLOW OBJECT

摘要

PROBLEM TO BE SOLVED: To produce a hollow object for a short time. SOLUTION: In a method for producing a hollow object 12 by supplying a molding material to the gate 4 communicating with the outside of the cavity 6 formed by a movable mold 5b wherein an undercut 13 is provided to the side surface of a core pin 7 and a fixed mold 5a from a molding material supply part 1 through a runner 3, the core pin 7 is rotated before the hollow object 12 is separated from the core pin 7 to allow the residual matter connected to the outer periphery of the hollow object 12 to be spaced apart from the gate port 4a being the part connected to the cavity 6 of the gate 4.