Production of tubular film
US4062916A · kind A · utility
3Cited by
5References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 13, 1976 |
| Grant date | Dec 13, 1977 |
| Priority date | — |
| Expiry date | Feb 13, 1996 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/0019
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Internal mandrel process and apparatus for the production of oriented tubular film in which rupture of the extruded tube by the pressure of inflating gas is prevented by means of a cup seal located between the mandrel and inflating zone, the cup seal being in peripheral engagement with the internal surface of the tube and presenting a substantially concave surface to the mandrel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.