Melt fracture reduction
US7632086B2 · kind B2 · utility
4Cited by
49References
41Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 25, 2003 |
| Grant date | Dec 15, 2009 |
| Priority date | — |
| Expiry date | Oct 1, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2982
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Melt fracture is reduced, without the necessity of polymer processing-aid additives specifically designed to alleviate exit region surface melt fracture phenomenon, by heating at least a portion of the die through which the polymer is extruded. The die exit region is maintained at a temperature above the bulk melt temperature of the polymer extruded through the die exit hole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.