Apparatus for face welding bundles of thermoplastic moldings under pressure

US4797173A · kind A · utility

Assignee

• Rohm GmbH Chemische Fabrik · DE

Inventors

• Heinz Gross · Lutherstadt Eisleben, DE
• Klaus E. Pohlmann · Darmstadt, DE
• Harmut Schikowsky · Darmstadt, DE

Key dates

• Filing date: Jun 16, 1986
• Grant date: Jan 10, 1989
• Expiry date: Jun 16, 2006

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/24165
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

The purpose of the process and the apparatus of the invention is to face weld extruded thermoplastic moldings the end faces of which lie in a plane and the end face edges of which are juxtaposed in a coplanar fashion. The end faces are pressed against a heatable and coolable plate in which grooves are formed corresponding to the cross-section of the end face. The floor of the grooves is heated up to or above the melting temperature of the plastic. The entry of the grooves is thermally insulated from the floor region and, if necessary, can be cooled. When the end faces are sunk into the grooves, the plastic is melted. The plastic melt, rising in the groove, is cooled until solid in the thermally insulated entry region. Following the welding in the floor region, the floor region is cooled below the melting temperature, and the welded bundle is separated from the plate.