Process and apparatus for producing a foamed polymer
US5889064A · kind A · utility
8Cited by
1References
12Claims
0Family size
Inventor
Key dates
| Filing date | Aug 6, 1997 |
| Grant date | Mar 30, 1999 |
| Priority date | — |
| Expiry date | Aug 6, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S521/917
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
In the process and an extrusion device for producing a foamed polymer, a polymer is melted and a foaming agent is added to the polymer melt. After the polymer melt and the foaming agent have been mixed, a throttle generates a pressure drop for nucleation for gas bubbles or cells. The mixture is then shaped, foamed and cooled. In order to produce high-grade foamed polymer with a microcellular or sub-microcellular structure continuously without any shaping limitations, the throttle controlling the flow rate has a passage control so that the flow rate can be adjusted independently of the pressure drop.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.