Method and an apparatus for the production of ribbed pipes
US4721594A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 23, 1986 |
| Grant date | Jan 26, 1988 |
| Priority date | — |
| Expiry date | Sep 23, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2023/003
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
This invention relates to a method and an apparatus for the production of ribbed pipes. The apparatus comprises a core which together with an extrusion sleeve forms a nozzle through which a plastic material is fed into a moulding space defined between a conically-enlarging mandrel and chill moulds moveable with respect to the mandrel. The volume of a moulding space defined between a plane at an end face of the extrusion sleeve, a surface of the mandrel, and a cylindrical plane projection from the surface of a kernel on the mandrel equals the combined volume of the grooves positioned at the mandrel at the mandrel at each particular moment. The method feeds a volume of the plastic material per unit time equal to volume of the pipe wall and ribs produced in that unit time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.