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. 27, 1984
Filed:
Nov. 26, 1982
Walter Stucke, Ratingen, DE;
Karl-Heinz Glissmann, Essen, DE;
Mannesmann AG, Duesseldorf, DE;
Abstract
The twin-nozzle extrusion head in accordance with the invention includes basically three axially spaced but radially overlapping annular housing members, together establishing two nozzle gaps and a first and a middle one of the two members are provided with annular feeder ducts for these nozzles. Each of these ducts has on its exit side a baffle ring wherein one baffle ring is effective on its radially inner surface while the second baffle ring is effective on a radially outer surface of larger diameter. These surfaces are nonround in a particular determined manner to establish nonuniform gap width related directly to the location of feed ducts for the annular channels, generally, the gaps are wider in locations away from a proximity of such feed ducts. The nozzle gaps are both frustoconical of different steepness and terminate in a common plane. The nozzles are particularly provided for disposing an adhesive on top of a steel pipe and a polyethylene coating and envelope on top of the adhesive.