Method of forming a multi-layer plastic pipe for conducting fluids

US5759461A · kind A · utility

Assignee

• UPONOR INNOVATION AB · SE

Inventors

• Jyri Jarvenkyla · Viinijärvi, FI
• Mikael Andersson · Ronneby, SE
• Anders Vestergaard · Hjørring, DK

Key dates

• Filing date: Dec 23, 1993
• Grant date: Jun 2, 1998
• Expiry date: Dec 23, 2013

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16D2200/0078
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A method of forming a two-layer plastic pipe (4;8) to be laid in the ground for conducting material therethrough forms a core pipe (2) consisting essentially of a first plastic material and forms a detachable outer hose (3;7) of a second plastic material around said core pipe (2) by a suitable coating method, including in said second plastic material an amount of additives effective to protect said core pipe with said outer hose from stresses and loads of laying said core pipe and outer hose and usage thereof in ground.