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Extrusion granulation method and device, and granulate produced therefrom

A granulation device and a technology for a strand, which is applied to the field of particles prepared by a method, can solve the problems of strand tearing, difficulty in adjusting thermal conditions, aggregation, etc., and achieve the effect of size.

Inactive Publication Date: 2012-11-14
POLYMETRIX AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

More particularly, this is also true for the desired maximum possible large-scale production volumes, since, in this case, the adjustment of the thermal conditions is more difficult and often presents problems with e.g. low-viscosity polyesters, Example: tearing of strands, aggregation of strands and / or particles or the like

Method used

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  • Extrusion granulation method and device, and granulate produced therefrom
  • Extrusion granulation method and device, and granulate produced therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] At a melt temperature of 280°C, a polyethylene terephthalate copolymer having 2% isopropyl Alcohol (IPA) with a melting temperature of 245° C. by DSC and an intrinsic viscosity of 0.6 dl / g. The die opening at the exit has a diameter of 2 mm and a length of 1 mm; 7 mm before the exit, the die has a diameter of 14 mm. Therefore, the following main data were generated: l / d=0.5; F / f=49; v aus = 261 m / min; v aus / f=83m / (minute×mm 2 ).

[0069] The die temperature was 230°C. After reaching a distance of 4mm from the die, the strands are subjected to water at a temperature of 84°C and are fed through a 3.2m long discharge chute, also subjected to water at a temperature of 84°C To the granulation device. The moving speed of the strand was 200 m / min, and the particles with a length of 3 mm and a weight of 15 mg were obtained. The residence time until particle formation was about 1 second.

[0070] Through a 1.2 m long feed pipe, the granules and the water were conveyed t...

Embodiment 2

[0072] Immediately after exiting the granule dryer, the granules of Example 1 were quenched, vacuum dried at 60°C, and then crystallized at 170°C for 20 minutes in a vessel without stirring.

[0073] The granules flowed freely, 88% of the granules were in the form of individual particles and 12% of the granules formed small agglomerates, wherein, in each case, the agglomerations occurred at the cut surfaces of the granules.

[0074] The flakes with a thickness of 2 μm showed a crystal structure with a crystal diameter of about 5 μm at the particle center, and the average crystal diameter became smaller toward the outside. At the edge, there is a layer with a thickness of about 40 μm in which the individual crystals are so small that, given the available sample thickness, the structure is no longer visible, resulting in a crystal diameter of <1 μm. Therefore, the nucleation density in the surface layer with a thickness of about 40 μm is higher than that at the center by more th...

Embodiment 3

[0080] The same polyethylene terephthalate copolymer as in Example 1 was extruded at a melt temperature of 276° C. at 200 kg / h through two dies. The die opening at the exit had a diameter of 5 mm and a length of 1 mm; 5 mm before the exit, the die had a diameter of 18.3 mm. Therefore, the following main data were produced: l / d=0.2; F / f=13.4; v aus = 70 m / min; v aus / f=3.5m / (minute×mm 2 ).

[0081] The die temperature was 260°C. After leaving the die at a distance of 4-5mm, the strands are subjected to water at a temperature of 84°C and then fed through a 2.2m long discharge chute also subjected to water at a temperature of 84°C To the granulation device. The moving speed of the strand was 250 m / min, and the particles with a length of 3 mm and a weight of 20 mg were obtained. The residence time until particle formation was about 0.5 seconds. Through a 1.2 m long feed pipe, the granules and the water were conveyed to a granule dryer where the granules were separated from ...

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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 extrusionextraction 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.

Description

technical field [0001] The present invention relates to a process for preparing polymer pellets of thermoplastic polyester or copolyester from a polyester melt using a strand pelletizer, wherein the polyester melt is supplied to a die orifice), which are then supplied in the form of strands via the discharge section to a granulation device with draw-in rollers, wherein the movement speed v of the strands is adjusted, for example, by the introduction rollers ab . The invention also relates to an improved strand pelletizer and pellets produced by the process of the invention. Background technique [0002] Corresponding strand pelletizers are known, for example such strand pelletizers are manufactured and sold by the applicant himself, eg under the product name Rieter USG600. [0003] In general, the preparation of polymer particles of thermoplastic polyesters or copolyesters from polyester melts confronts the person skilled in the art with certain difficulties, in particular...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B9/06B29C47/12B29C48/30
CPCB29B2009/165B29B9/06B29B9/12B29B9/16
Inventor J·博岑A·德尔S·芬切尔B·A·库伯特F·欧塞比奥F·莫尔甘蒂
Owner POLYMETRIX AG
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