Patent · US Expired

Method for producing plastic objects

US5759459A · kind A · utility

24Cited by

1References

6Claims

0Family size

Assignee

Battenfeld GmbH · DE

Inventors

Helmut Eckardt
Jurgen Ehritt · Hilchenbach, DE
Alfons Seuthe · Meinerzhagen, DE
Michael Gosdin · Meinerzhagen, DE

Key dates

Filing date	Jul 29, 1996
Grant date	Jun 2, 1998
Priority date	—
Expiry date	Jul 29, 2016

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29C2045/1714
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A method and an apparatus for producing plastic objects with hollow spaces is disclosed. The method comprises the following steps: injecting a sufficient amount of plastic melt into the cavity (2) of the molding tool (1); simultaneously and/or subsequently injecting a pressurized fluid into the melt by means of a fluid injection nozzle (7); allowing the molded part (6) to cool; relieving the cavity (2) of the pressure of the compressed fluid, and demolding the molded part, while plastic melt is driven out into at least one overflow cavity (8), which is connected to the cavity (2). According to the invention, the volume of the overflow cavity (8) is changed, and in particular enlarged. This volume increase advantageously is controlled or regulated. The advantage achieved thereby is that the injection molding cycle, especially the overflow of melt into the overflow cavity (8), remains controllable by simple means.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.