Method and apparatus for sealing a plastic injection mould

A product is molded by injecting melt into a tool cavity and then following this by injecting pressurized fluid, in particular a gas, between part of the wall and the injected melt. During or after melt injection and during or before injecting the gas the tool cavity(3) is sealed against the outer a...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	ECKARDT, HELMUT, WUELFRATH, MARC, BLOEMEKE, CHRISTOF, JAROSCHEK, CHRISTOPH, DR, EHRITT, JUERGEN, HUNOLD, MATHIAS
Format:	Patent
Sprache:	eng ; fre ; ger
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
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	A product is molded by injecting melt into a tool cavity and then following this by injecting pressurized fluid, in particular a gas, between part of the wall and the injected melt. During or after melt injection and during or before injecting the gas the tool cavity(3) is sealed against the outer atmosphere by activating a seal(4) between the tool faces. An Independent claim is made for an the injection molding tool(2) for the process comprising two or more halves and an injector(7) for compressed gas in one wall of the cavity so that a fluid cushion forms between melt and wall. A seal(4) to prevent gas escape is located in at least one tool half. Preferred Features: Activation of the seal(4) is controlled by open and/or closed loop system and is either time, pressure or stroke dependent. Either the melt or compressed fluid may be used as the controlling medium.