Packaging container having a pressure relief valve

US4653661A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Norbert Buchner · Winnenden, DE
• Klaus Domke · Ditzingen, DE

Key dates

• Filing date: Apr 28, 1986
• Grant date: Mar 31, 1987
• Expiry date: Apr 28, 2006

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B65D77/225
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

A packaging container having a pressure relief valve which is suitable for packaging products that are vulnerable to oxygen and products that give off gases. The packaging container has at least one rigid and flat wall, which is surrounded by an offstanding peripheral flange and on the outside surface of which the pressure relief valve is secured. The pressure relief valve has a flexible membrane, which is secured on the wall in opposed peripheral zones by means of two adhesive strips. With its middle zone, the membrane defines a path and covers an opening in the wall. The opening is located in an indentation by means of which a pressure-action surface of the membrane is provided. A film of oil may be added in the middle zone to assist in preventing entrance of air into the container.