Method of producing sealed packaging containers

US4290253A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Klaus Domke · Ditzingen, DE
• Walter Saur · Ditzingen, DE

Key dates

• Filing date: Dec 18, 1979
• Grant date: Sep 22, 1981
• Expiry date: Dec 18, 1999

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B65D31/14
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

Method of manufacturing a filled packaging container comprising the steps of forming a bag on a mandrel, connecting a seam provided in a formed bag, forming a hole on an upper side of the bag and inserting a valve into the hole to provide an air pressure release after filling the container with a material. Two opposite edges of the valve are formed with two flexible portions made of foil. A sealing fluid is applied in the channel to provide a fluid film to connect the foil portions.