Method and apparatus for producing tubular article
US4357962A · kind A · utility
Inventor
Key dates
| Filing date | May 15, 1978 |
| Grant date | Nov 9, 1982 |
| Priority date | — |
| Expiry date | May 15, 1998 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L9/121
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method and apparatus are disclosed for producing a composite pipe for handling destructive materials under pressure and vacuum conditions. The pipe includes a tubular liner formed of thermoplastic material capable of withstanding the destructive material. A strip of glass fiber fabric is helically wrapped around the outer surface of the liner. Heat is applied externally to the wrapped liner at a sufficient rate to simultaneously melt the exterior surface of the liner and thermally expand the liner radially outwardly into the openings in the fabric. Upon cooling, a permanent mechanical bond is achieved between the liner and the fabric. A layer of fiber glass and resin is then applied to the outer surface of the wrapped liner for structural rigidity and strength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.