Method and device for producing a double-walled thermoplastic corrugated pipe having a connecting sleeve
US8231824B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 18, 2008 |
| Grant date | Jul 31, 2012 |
| Priority date | — |
| Expiry date | Oct 18, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2023/186
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
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 (10) 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.