APPARATUS FOR INJECTION MOLDING ARTICLES OF FOAM MATERIAL

A method of molding articles of foam material comprising melting an injection molding material and mixing the material with a blowing agent in liquid form in a plasticator at a temperature and pressure such that the temperature is below the temperature at which the liquid foaming agent converts to a...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	ROBERT C. SIMMONDS JR, WILLIAM T. KYRITSIS
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:	A method of molding articles of foam material comprising melting an injection molding material and mixing the material with a blowing agent in liquid form in a plasticator at a temperature and pressure such that the temperature is below the temperature at which the liquid foaming agent converts to a gas, and forcing the mixture through an orifice which resists the flow of the material to impart heat thereto, the heat imparted being of a magnitude sufficient to raise the temperature of the mixture to at least equal that at which the liquid foaming agent converts to a gas, and delivering the mixture, containing the gas, to a mold cavity.