High clarity polyolefin multilayer blown coextruded film
US6368545B1 · kind B1 · utility
19Cited by
11References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 13, 1999 |
| Grant date | Apr 9, 2002 |
| Priority date | — |
| Expiry date | May 13, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2995/0026
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
At least two techniques can be used separately or together to achieve higher clarity in multilayer blown coextruded films. In a first technique, the core layer is extruded at a higher temperature than the skin layer or layers. In the second technique, the core layer has a higher density than the skin layer or layers. Combinations of these techniques are also contemplated. Either one or both techniques may be used to a sufficient degree to improve clarity (generally lower haze).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.