The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 23, 2004
Filed:
May. 24, 2002
Volker Mende, Darmstadt, DE;
Wolfgang Scharnke, Darmstadt, DE;
Roehm GmbH & Co., KG, Darmstadt, DE;
Abstract
An extrusion die has a distributing tool; a profiling nozzle; and at least three melt-flow ducts; a first melt-flow duct is routed around a second melt-flow duct or the distributing tool using a branch and is merged again downstream from the branch; and a third melt-flow duct opens into the second melt-flow duct. The extrusion die is suitable for extrusion of a hollow-chamber profiled panel of a thermoplastic plastic with a layered structure which comprises a top and bottom layer of a first plastic melt; and an intermediate layer of a second plastic melt disposed in an interior of a hollow chamber profile. The first plastic melt is allocated to the first melt-flow duct and to the second melt-flow duct and the second plastic melt is allocated to the third melt-flow duct. During the extrusion the second plastic melt is deposited onto the first plastic melt upstream from or in the region of the branch, and a distribution of the deposited second plastic melt is regulated using the distributing tool. The second melt-flow duct conveying the first plastic melt and the deposited second plastic melt is then merged with the first melt-flow duct in the profiling nozzle, whereupon the first plastic melt from the first melt-flow duct is deposited on the second plastic melt from the second melt flow duct, to sandwich the second plastic melt between two layers of the first plastic melt; and the united plastic melts are shaped to the hollow-chamber profiled panel during ejection from the profiling nozzle.