Barrier-coated tube of biaxially stretched thermoplastic material having a monoaxially stretched barrier coating thereon
US4615925A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 25, 1983 |
| Grant date | Oct 7, 1986 |
| Priority date | — |
| Expiry date | Apr 25, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/1379
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for providing a container with one or more layers of barrier material during the production of the container from a thermoplastic. A preform (10) is stretched in its axial direction, generally an amount corresponding to the total axial stretching required for conversion of the preform to a container, after which the stretched preform (11, 13) is provided with one or more barrier layers (12, 14), and the preform is then heated and converted to a container. In one embodiment, the axially stretched preform (15) is produced by assembling axially stretched part-preforms (13a, b) covered with one or more barrier layers. The combined preform is then converted to a container. By means of the invention, it is possible to reduce the thickness of the barrier layers at the time of their application, which considerably simplifies the latter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.