The injection molding die null fixed side for the hollow

摘要

PROBLEM TO BE SOLVED: To provide a mold for injection-molding a hollow product which can mold a slender resin product and others precisely and efficiently by a hot runner method. ;SOLUTION: This mold for injection molding a hollow product has a cavity space C formed in a fixed side mold 20, a core 6 which penetrates the space C along its central axis and the base end of which is fixed to a movable side mold 2, a gate nozzle 50 which is formed in the fixed side mold 20 and the tip of which is arranged coaxially with the cavity space C, a heater 55 wound onto the nozzle 50, and a valve stem 70 which penetrates freely slidably along the central axis of the nozzle 50. A slender recessed part 72 which engages slidably with a pin 12 at the tip of the core 6 is formed at the tip of a stem 70, the opening part 58 of a guide in a nozzle tip 56 on the tip side of the gate nozzle 50 supports the peripheral surface of the stem 70, and the gate can be opened/closed by a recessed groove-shaped clearance 59 formed in the opening part 58 and the peripheral surface of the sliding stem 70.;COPYRIGHT: (C)1999,JPO