Device for modifying the thickness of a body extruded at a constant rate
US4157235A · kind A · utility
22Cited by
2References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 21, 1977 |
| Grant date | Jun 5, 1979 |
| Priority date | — |
| Expiry date | Jul 21, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2023/003
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The process modifies the thickness of the wall of a tube of thermoplastic material which issues at constant speed from an extruder and is driven downstream of and in the extension of the extruder by a drawing machine. The drawing machine has motorized rolling members which frictionally drive the tube and permit modifying the speed at which the tube is driven. The thickness of the wall is modified by producing a relative movement of translation between the extruder and drawing machine while maintaining the speed of rotation of the rolling members.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.