Multiple-layered sheeting apparatus
US4483669A · kind A · utility
14Cited by
12References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1983 |
| Grant date | Nov 20, 1984 |
| Priority date | — |
| Expiry date | Apr 15, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2948/92961
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Disclosed is a process and apparatus for extrusion of multiple-layer sheeting comprising an improved co-extrusion feedblock and valve plate for laying down co-extruded resin streams onto a main extruded polymeric resin. The new design provides advantageous external control of the layer number as well as a more refined control of layer thicknesses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.