Extruding a thermoplastic laminate with recycled trimmings

US4756858A · kind A · utility

Assignee

• REIFENHÄUSER GMBH & CO. KG MASCHINENFABRIK · DE

Inventors

• Hans Reifehauser · Troisdorf, DE
• Heinz Beisemann · Rösrath, DE
• Clemens Krumm · Neunkirchen, DE
• Hans D. Ott · Sankt Augustin, DE
• Paul Reitemeyer · Troisdorf, DE

Key dates

• Filing date: Feb 6, 1987
• Grant date: Jul 12, 1988
• Expiry date: Feb 6, 2007

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29C48/74
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

An apparatus for extruding a thermoplastic laminate has a nozzle assembly having a nozzle body centered generally on a plane and formed at the plane with a merge passage, with an outlet slot opening in one direction from the merge passage, with core-layer distribution and intake passages centered on the plane and opening in the opposite direction into the merge passage, and with cover-layer distribution and intake passages opening laterally into the merge passage. A core-layer fitting formed with tempering chambers forms part of the core-layer intake passage and a trimmings fitting mounted on the nozzle body has a trimmings intake passage and a trimmings feed passage extending therefrom to the cover-layer distribution passage. A liquefied core-layer resin is fed under pressure to the core-layer intake passage and therethrough to the merge passage and outlet slot. Laminate trimmings are also fed under pressure to the trimmings intake passage and therethrough and through the trimmings feed passage to the merge passage, and a liquefied cover-layer resin is fed under pressure to the cover-layer intake passage and therethrough to the merge passage and outlet slot and also to the trimmin…