Patent · US Active

Method and device to reduce the acetaldehyde content of polyester granulate

US7521522B2 · kind B2 · utility

7Cited by

17References

30Claims

0Family size

Assignee

Lurgi Zimmer GmbH · DE

Inventors

Brigitta Otto · Lenzen (Elbe), DE
Rainer Linke · Gummersbach, DE
Roland Schafer · Rottweil, DE
Holger Bachmann · Weiterstadt, DE

Key dates

Filing date	Aug 25, 2006
Grant date	Apr 21, 2009
Priority date	—
Expiry date	Jan 15, 2027

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/1352
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

The invention relates to a method for producing a granulate with a low acetaldehyde content and improved processing properties from a high-viscosity polyester melt, wherein the polyester melt strand is fragmented under water at the highest possible temperature, the accompanying water is separated from the granulate with the least possible cooling of the granulate, the low-water granulate obtained in this way is passed after removal of the water directly into a dealdehydisation container and the granulate in the dealdehydisation container is treated with a flow of rinsing air, plus a device for carrying out this method.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.