Process for forming a flange on a hollow body of thermoplastic material

US4867929A · kind A · utility

Assignee

• Krupp Corpoplast Maschinenbau GmbH · DE

Inventors

• Peter Albrecht · Hamburg, DE
• Adolf Appel
• Karl-Heinz Balkau · Oststeinbek, DE
• Claus Horwege · Hamburg, DE
• Wolfgang Reymann · Hamburg, DE
• Peter Rose · Ramona, US
• Klaus Vogel · Gondelsheim, DE
• Walter Wiedenfeld · Hamburg, DE

Key dates

• Filing date: Nov 23, 1987
• Grant date: Sep 19, 1989
• Expiry date: Nov 23, 2007

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29L2031/7132
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A process and an apparatus for forming a flange on the wall portion of a hollow body of thermoplastic material with an opening at one end provides that the end part of the wall portion which defines the opening is heated and contracted by means of a force acting on the end portion from the outside thereof over the periphery thereof, whereupon the contracted end part is subjected to a pressing operation to form a flange extending around the contracted end part.