Method for forming a thermoplastic composition that contains a plasticized starch polymer
US9327438B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 2011 |
| Grant date | May 3, 2016 |
| Priority date | — |
| Expiry date | Feb 9, 2035 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2995/006
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method and system for melt processing a thermoplastic composition that contains a starch and plasticizer is provided. The composition is melt blended and extruded through a die to form an extrudate, which is thereafter cooled using a multi-stage system of the present invention that includes at least one water-cooling stage and at least one air-cooling stage. More particularly, the extrudate is initially contacted with water for a certain period time so that it becomes partially cooled and solidified on its surface. After the water-cooling stage(s), the extrudate is also subjected to at least one air-cooling stage in which a stream of air is placed into contact with the extrudate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.