Unicor Gmbh Rahn Plastmaschinen

Unicor Gmbh

Advanced Pipe Services, LLC

Profilepipe Machinery Inc.

Hubert Kossner

Dietmar Pfennig

Timothy Toliver

A method and an apparatus for producing an endless double-walled pipe having corrugated pipe sections and sleeve pipe sections are described. The production is effected by extrusion of an outer tube (Sa), forming the outer pipe of the double-walled pipe, and of an inner tube (Si), forming the inner tube of the double-walled pipe, in a molding passage () having sections with a corrugated molding surface and a smooth cylindrical sleeve molding surface. To shape the sleeve section, the outer tube is extruded into the sleeve molding surface and is brought into contact with the sleeve molding surface. The inner tube (Si) is then extruded into the outer tube (Sa), already in contact over the entire axial length of the sleeve molding surface, and is brought in the process into contact with the inner side of said outer tube (Sa) that is in contact.

Method and device for producing a double-walled thermoplastic corrugated pipe having a connecting sleeve

An apparatus for producing seamless plastic tubes comprises an injection head to which molten plastic material is fed by an extrusion device. The injection head has a plate-shaped distribution devicehaving an intake openinginto which the feed passagefor the molten plastic material opens. In the distribution device, distribution passagesextend in a star configuration from the intake openingand extend perpendicularly to the axis of the injection head, wherein each distribution passagehas a straight radial passage portionand three branch passageswhich branch therefrom and which each go into arcuate passage portionswhich, in the region of the periphery of the distribution device, communicate with the annular gapof the injection head, with the adjacent ends at a respectively identical angular spacing, and they each introduce a respectively identical volume flow into the annular gap

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Schwanfeld, Germany

Hubert Kossner