Cooling thermoplastic tubes
US3993723A · kind A · utility
4Cited by
5References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 17, 1974 |
| Grant date | Nov 23, 1976 |
| Priority date | — |
| Expiry date | Jun 17, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2791/006
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Cooling an extruding thermoplastic tube by feeding the tube adjacent a cooling surface, maintaining a sheath of heat-transfer fluid between the tube and surface and preferentially cooling at least a selected area of the tube by transversely displacing the tube to decrease the thickness of the sheath between the selected area and the cooling surface. The invention is particularly suitable, for the production of thermoplastic films by orienting a cast tubular extrudate which has been cooled by means of an internal mandrel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.