CONTROL UNIT FOR INJECTION MOLDING MACHINES

According to this invention, the throttle area of a nozzle (4) is varied in accordance with an injection speed so that the temperature of a resin is not affected by variations in the injection speed, whereby the injection speed and the temperature of the resin can be controlled independently of each...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	FUNABASHI, TETSUJI, INABA, NOBUAKI, TANAKA, NOBUKAZU, KAMINISHI, MASASHI, MATSUDA, KAZUO
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING PERFORMING OPERATIONS 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:	According to this invention, the throttle area of a nozzle (4) is varied in accordance with an injection speed so that the temperature of a resin is not affected by variations in the injection speed, whereby the injection speed and the temperature of the resin can be controlled independently of each other. This enables a molding operation to be carried out more easily, and the accuracy and stability of a molded product to be improved. According to this invention, the throttle area of the nozzle (4) is also varied in accordance with the temperature of a metal mold so as to maintain the specific volume of the resin in a metal mold cavity (6) at a predetermined level at all times, so that a stable, continuous and accurate molded product can be obtained.