Multilayer coextrusion apparatus
US5223276A · kind A · utility
26Cited by
18References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1991 |
| Grant date | Jun 29, 1993 |
| Priority date | — |
| Expiry date | Apr 29, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2948/92942
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A coextrusion apparatus for producing a multilayer film or sheet of diverse thermoplastic materials has a slit die and a feedblock assembly integrated into the die. The assembly includes a removable feedblock received within a cavity of the die and has a plurality of slotted, layer distribution passages opening into a coathanger-type expansion chamber via a shallow entrance section. The passages are mutually spaced apart and lie parallel to the slotted outlet of the die.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.