Patent ID: 8063176
Filing Date: 2011-11-22
Classification: B01J,B29B,C08G

Abstract:
1. A method for the manufacture of crystallized polyester material, comprising providing a partly crystalline polyester material comprising a degree of crystallization of 1% to 15% and a granule temperature above the crystallization temperature T k and permitting the partly crystalline polyester material to flow through a crystallization apparatus at a treatment temperature suited for crystallization, wherein the crystallization apparatus has three zones (I), (II), and (III), wherein the partly crystalline polyester material is crystallized (i) in zone (I) under mechanical disturbance and without flow of a gas, (ii) in zone (II) under mechanical disturbance and without flow of a gas, and (iii) in zone (III) without mechanical disturbance and without flow of a gas and wherein the total residence time of the polyester material in zones (I), (II) and (III) is from 2 to 20 minutes.