MANUFACTURE OF MOLDED ITEM AND MOLD THEREFOR

PURPOSE:To prevent a molded item from adhering to a cavity or core that has no ejector pin, by causing the pressure between the core or cavity and the molded item to be a positive pressure, and taking out the molding item by ejector pins. CONSTITUTION:When an item W molded by a mold consisting of a...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	KIKUCHI HIDETOSHI, SAITOU TAMOTSU
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CASTING CASTING OF METALS CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES PERFORMING OPERATIONS POWDER METALLURGY SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	PURPOSE:To prevent a molded item from adhering to a cavity or core that has no ejector pin, by causing the pressure between the core or cavity and the molded item to be a positive pressure, and taking out the molding item by ejector pins. CONSTITUTION:When an item W molded by a mold consisting of a core 1 and a top force 3 by injection molding is to be removed from the mold, the force 3 is moved away from the core 1 and at the same time compressed air is supplied via a hose 5. Then the air flows via a check valve 4 and its pressure acts between the force 3 and the molded item W so that the negative pressure produced when they are separated can be cancelled and at the same time the pressure between them becomes positive. As a result, the molded item W can be separated easily from the force 3. Thereafter, ejector pins 2 are pressed to the molded item W to remove the molded item W from the core 1.