Coextrusion apparatus and process
US4789513A · kind A · utility
35Cited by
9References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 5, 1987 |
| Grant date | Dec 6, 1988 |
| Priority date | — |
| Expiry date | Jun 5, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/08
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention provides a novel coextrusion apparatus including, in a preferred embodiment, a die within a feedblock. The apparatus includes edge seam-forming channels, which provide a core layer sandwiched within adjacent layers having integrally seamed edges. Also provided in a unique process for sandwiching a core stream within adjacent layers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.