Process for the production of hollow bodies of thermoplastic material

US8003041B2 · kind B2 · utility

Assignee

• Kautex Textron GmbH & Co. KG · DE

Inventors

• Matthias Borchert · Bonn, DE
• Dirk Eulitz · Bonn, DE
• Gerd Wolter · Rübhausen, DE
• Timo Kramer · Hirz-Maulsbach, DE
• Harald Lorenz · Bad Neuenahr-Ahrweiler, DE
• Deniz Bienhuls · Bad Honnef, DE
• Christoph Mehren · Rübhausen, DE
• Robert Lower · Rheinbach, DE

Key dates

• Filing date: Jun 8, 2007
• Grant date: Aug 23, 2011
• Expiry date: Apr 29, 2028

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29L2031/7172
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

The invention concerns a process for the production of hollow bodies of thermoplastic material. In the process according to the invention preforms in web or band form of plasticized material are shaped in a multi-part tool forming a mold cavity comprising two outer molds and at least one central mold which perform an opening and closing movement relative to each other. The central mold is provided with at least one component holder which can be moved of and into the tool plane defined by the central mold. In a first step the component holder is fitted with at least one insert portion, then the insert portion is placed by means of the component holder against the inside wall of an outer mold. In a further step introduction and shaping of the preforms within the tool is effected in a two-stage procedure, wherein firstly the preforms are respectively applied against a contour forming a part of the mold cavity by means of increased pressure and/or reduced pressure and shaped and then the intermediate products forming respective parts of the hollow body are joined together to form a finished product.