Method of producing multilayer thermoplastic pipe

Details Method of producing multilayer thermoplastic pipe Method of producing multilayer thermoplastic pipe

1996-02-08

1999-11-02

Crispino, Richard

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

15624421, 15624423, 156285, 1563099, 156322, B29C 4706

Patent

active

059762985

ABSTRACT:
For the production of a multilayer pipe of thermoplastic material, in particular polyolefine, an extrusion equipment is provided, extruding at least one tube in a direction of production. A calibrating arrangement for forming a pipe of externally profiled shape is provided downstream of the extrusion equipment. The calibrating arrangement is followed by a preheater for heating to welding temperature the outer surfaces of the externally profiled shape. Furthermore, a coextruding head is provided, having an extruder for coextruding a tube around the pipe, the coextruding head having a partial vacuum connecting line for the tube and the outer surfaces to be welded together under the difference pressure between ambient pressure and partial vacuum.

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EPO Search Report for EP 96101460.

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