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HOT RUNNER NOZZLE, MOLD FOR MOLDING OF MULTI-LAYER MOLDING USING THE HOT RUNNER NOZZLE, METHOD OF FEEDING MOLTEN RESIN INTO MOLD USING HOT RUNNER NOZZLE AND METHOD OF MULTI-LAYER MOLDING USING HOT RUNNER NOZZLE
HOT RUNNER NOZZLE, MOLD FOR MOLDING OF MULTI-LAYER MOLDING USING THE HOT RUNNER NOZZLE, METHOD OF FEEDING MOLTEN RESIN INTO MOLD USING HOT RUNNER NOZZLE AND METHOD OF MULTI-LAYER MOLDING USING HOT RUNNER NOZZLE
PROBLEM TO BE SOLVED: To prevent molding of a middle layer of a multi-layer molding as in a shape entering a sprue, in a sprue-corresponding part of an in-mold space of a mold, in the stage of completion of charging for multi-layer molding by using a hot runner nozzle, and obtain a multi-layer molding without exposure of the middle layer in a cut part of the sprue.;SOLUTION: In a hot runner nozzle, a nozzle gate 7 is smaller in diameter than a hole 3 for shutoff pin, and a convex part 13 which enters the nozzle gate 7 when the shutoff pin 2 advances to close the whole of a resin discharge port and extrudes a molten resin in the nozzle gate 7 into an in-mold space is provided at the tip of the shutoff pin 2. A discharge port opening/closing mechanism portion for opening and closing the resin discharge port in the shutoff pin 2 is thus different in diameter from a nozzle gate opening/closing mechanism portion which is composed of the convex part 13 and extrudes the molten resin in the nozzle gate.;COPYRIGHT: (C)2015,JPO&INPIT
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