Patent · US Expired

Device for injection molding articles of plastics material which contain hollow spaces

US5895667A · kind A · utility

2Cited by

5References

14Claims

0Family size

Assignee

Battenfeld GmbH · DE

Inventors

Helmut Eckardt
Jurgen Ehritt · Hilchenbach, DE
Michael Renger · Meinerzhagen, DE

Key dates

Filing date	Feb 1, 1995
Grant date	Apr 20, 1999
Priority date	—
Expiry date	Feb 1, 2015

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29C2045/1738
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A device for injection molding articles of plastics material having hollow spaces. The device includes a molding tool with a mold cavity. Plastics material melt is fed to the mold cavity through a nozzle. Another pressurized medium is supplied to the mold cavity through a hollow needle at a location different from the location of the nozzle. A needle core is mounted in the hollow needle. The needle core is axially displaceable within certain limits. The opening of the hollow needle to the mold cavity can be opened and closed or its cross-sectional area can be varied by moving the needle core.

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