Patent · US Expired

Method and apparatus for continuously crystallizing polyester material

US5090134A · kind A · utility

32Cited by

2References

24Claims

0Family size

Assignee

Buhler AG · CH

Inventors

Hans Russemeyer · Hanerau-Hademarschen, DE
Manfred Kerl · Braunschweig, DE
Hans-Joachim Schmidt · Ingolstadt, DE
Beat Hani · Zollikofen, CH
Werner Kagi · Niederuzwil, CH

Key dates

Filing date	Dec 22, 1989
Grant date	Feb 25, 1992
Priority date	—
Expiry date	Dec 22, 2009

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29K2105/0002
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

Polyester granulates, in particular slowly crystallizing adhesive copolyesters are crystallized in two fluidized beds (1, 2) arranged in series and are guided into an impact apparatus (3) for the subsequent comminution of the small agglomerates. The first fluidized bed (1) is an effervescent fluidized layer with mixing characteristic and the second fluidized bed (2) is a flow bed with a plug flow characteristic. The second fluidized bed (2) ensures an adequate treatment duration in order to crystallize the amorphous grains of granulate which remain after the first fluidized bed (1).

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