Method for producing homogeneously crystallized polycondensate pellets
US8562882B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 2007 |
| Grant date | Oct 22, 2013 |
| Priority date | — |
| Expiry date | Jul 6, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29B2009/165
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The invention relates to a method for the continuous production of semicrystalline polycondensate pellets. Said method comprises the following steps: producing a polycondensate material; shaping polycondensate pellets and solidifying the polycondensate melt in a liquid cooling medium, wherein the shaping of the pellets can be carried out prior to or after solidification; separating the pellets from the liquid cooling medium once the polycondensate pellets have cooled down to an average temperature that lies within the crystallization temperature range of the polycondensate; and crystallizing the pellets in a treatment chamber, the treatment gas being led in said treatment chamber in a countercurrent to the polycondensate pellets, the flow rate of the treatment gas being above the incipient fluidization point of the polycondensate pellets and the polycondensate pellets having a narrow dwell time spectrum in the treatment chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.