Method of processing polymers using a single screw
US7615170B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 30, 2004 |
| Grant date | Nov 10, 2009 |
| Priority date | — |
| Expiry date | Jan 21, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49716
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Injection molding and blow molding systems that include screws having low L:D ratios are provided. The systems are capable of producing microcellular polymeric materials. In some cases, the systems may be formed by retrofitting conventional polymer processing systems. Retrofitting may involve changing (e.g., machining or replacing) existing components of the conventional system, as well as, adding new components to the system. For example, retrofitting generally involves replacing the conventional polymer processing screw with a new screw designed to satisfy conditions needed for processing microcellular materials. In other cases, the systems may be newly manufactured. The retrofitted or newly manufactured systems of the invention are considerably less expensive than newly manufactured microcellular processing systems having higher L:D ratios.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.