Automatik Plastics Machinery Gmbh

Maag Automatik Gmbh

Horst Mueller

Stefan Deiss

Frank Gloeckner

Reinhardt-Karsten Muerb

The invention relates to a method for producing a plastic granulate (), in which a process fluid () is contained in a process chamber () where an underwater granulation takes place and the process fluid in the process chamber has a temperature greater than 120&#xb0; C. A process pressure of at least 2.0 bar is obtained in the process chamber, at which a granulation of the plastic strands () into plastic granulate occurs. From the process chamber, a mixture () of process fluid and plastic granulate is diverted into a first cooling zone () during cooling of the plastic granulate, while maintaining the process pressure. In a first separating device (), the plastic granulate is separated from the process fluid under process pressure. In the process chamber, the process fluid has a temperature in the range from 120&#xb0; C. to 160&#xb0; C., and the process pressure obtained there is greater than the pressure of the vapour pressure curve of the process fluid. After separation from the process fluid in the first separating device, the plastic granulate is fed continuously in a line to a dealdehydization container ().

Method for producing a plastic granulate

A process for production of polyethylene terephthalate pellets includes the steps of: production of a melt of polyethylene terephthalate material; production of polyethylene terephthalate pellets from the melt by means of underwater pelletization into a process fluid; removal of the polyethylene terephthalate pellets from the site of underwater pelletization in the process fluid; crystallization of the polyethylene terephthalate pellets in the process fluid, wherein a surface of the polyethylene terephthalate pellets is crystallized and an interior of the polyethylene terephthalate pellets remains amorphous.

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Leidersbach, Germany

Horst Mueller