Apparatus for the production of tubular film
US3954360A · kind A · utility
3Cited by
5References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 14, 1974 |
| Grant date | May 4, 1976 |
| Priority date | — |
| Expiry date | Aug 14, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/902
- 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 of the mandrel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.