Extrusion methods and apparatus
US5106562A · kind A · utility
19Cited by
13References
31Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 28, 1989 |
| Grant date | Apr 21, 1992 |
| Priority date | — |
| Expiry date | Dec 28, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/335
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Methods and apparatus for reducing the impact of a higher temperature polymeric melt stream element on a lower temperature polymeric melt stream element, and vice versa. The methods include: supercooling the hotter melt stream element, exposing one or more melt stream elements to an undesirable thermal condition for a limited period of time, and/or using one or more layers as a heat sink. The apparatus is provided by a modified die in which one of the melt stream elements having the disparate temperatures traverses the die in a foreshortened path in the direction of extrusion of the extrudate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.