Device and process for injection molding of hollow plastic parts

US6913719B2 · kind B2 · utility

Assignee

• Battenford GmbH · DE

Inventors

• Helmut Eckardt
• Stephan van der Steen · Kierspe, DE
• Marc Wulfrath · Kierspe, DE
• Rolf Schwesinger · Meinerzhagen, DE
• Norbert Bielich · Kreuztal, DE

Key dates

• Filing date: Mar 22, 2002
• Grant date: Jul 5, 2005
• Expiry date: Mar 28, 2023

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29C2045/1708
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Device and process for injection molding of molded parts made from plastic material having at least one cavity, which has means for injecting plastic melt into the cavity of an injection-molding die along a melt flow path and means for injecting a fluid into the still molten plastic material, wherein the means for injecting a fluid are designed in order to inject a liquid at preset pressure and preset quantity. Provision is made in that the means for injecting a liquid includes a first part element, which is arranged centrally and remote from the injection-molding die and supplies at least one injection-molding die, and includes at least one second part element, which is arranged in the immediate vicinity of the injection-molding die, and a third part element, which is arranged locally on the injection-molding die at least during injection of the liquid.