Method and device for processing a thermoplastic condensation polymer
US6838496B1 · kind B1 · utility
23Cited by
7References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 3, 1999 |
| Grant date | Jan 4, 2005 |
| Priority date | — |
| Expiry date | Nov 3, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2105/26
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Method and device for reprocessing a thermoplastic polycondensate, in particular for the recycling of thermoplastic polycondensates, such as polyethylene terephthalate, polyester or polyamide is provided. The polycondensate is introduced into an extruder in a solid state. The polycondensate is then heated to a temperature below melting temperature and degassed or dried at below atmospheric pressure or with an inert gas added. Preferably, to prevent the polycondensate flakes from escaping through a degassing opening, a conveying device is used to convey the escaping flakes back into the extruder. The dried flakes are then melted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.