Arrangement for producing a hollow shaped body

US5076778A · kind A · utility

Assignee

• Schade GmbH & Co. KG · DE

Inventors

• Harald Strunk · Plettenberg, DE
• Kurt Gohr · Attendorn, DE

Key dates

• Filing date: Oct 22, 1990
• Grant date: Dec 31, 1991
• Expiry date: Oct 22, 2010

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29C2045/1726
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A hollow injected shaped body of synthetic plastic is produced by injecting a predetermined quantity of a synthetic plastic melt into a multi-part mold, and forming the melt to the shaped body by a gas under pressure. After bringing the synthetic plastic melt into the mold cavity, the gas is injected into the synthetic plastic melt, then after overcoming the shaped body wall it flows into an overflow chamber from it into a gas circulation system so that during the forming of the melt a hollow formed in the shaped body is continuously supplied with the gas until rigidification of the shaped body.