Extrusion granulation method and device, and granulate produced therefrom
First Claim
1. A process comprising producing pellets of polymers of thermoplastic polyesters or copolyesters from a polyester melt with a strand pelletizer in which the polyester melt is supplied to die orifices and is thereafter supplied in the form of strands via a discharge section to a pelletization device with draw-in rollers, wherein a strand removal speed vab is adjusted via the draw-in rollers, wherein the strands exit the die orifices at an exit speed vaus of at least 110 m/min, wherein a relationship of exit speed vaus divided by the area f of the die orifice opening of a respective die orifice vaus/f is configured such that the condition vaus/f≧
- 30 m/(min×
mm2) is satisfied, and wherein the strands thus issuing from respective die orifices are brought into contact with a cooling fluid.
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Accused Products
Abstract
The invention relates to a method for the production of granulate grains of polymers from thermoplastic polyesters or copolyesters from a polyester melt using an extrusion granulator. The polyester melt is fed to nozzles of the extrusion granulator and then, with draw-in rollers, to the granulation device via an extraction section as extrusions exiting from the nozzle, wherein, e.g., an extrusion extraction speed is set by the draw-in rollers. The invention also relates to an improved extrusion granulator according to the invention having a wave device between the nozzles and the extraction channel, and granulate grains produced according to the method according to the invention.
32 Citations
21 Claims
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1. A process comprising producing pellets of polymers of thermoplastic polyesters or copolyesters from a polyester melt with a strand pelletizer in which the polyester melt is supplied to die orifices and is thereafter supplied in the form of strands via a discharge section to a pelletization device with draw-in rollers, wherein a strand removal speed vab is adjusted via the draw-in rollers, wherein the strands exit the die orifices at an exit speed vaus of at least 110 m/min, wherein a relationship of exit speed vaus divided by the area f of the die orifice opening of a respective die orifice vaus/f is configured such that the condition vaus/f≧
- 30 m/(min×
mm2) is satisfied, and wherein the strands thus issuing from respective die orifices are brought into contact with a cooling fluid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
- 30 m/(min×
Specification