Buehler Ag

Rieter Automatik Gmbh

Martin Mueller

Camille Borer

Frank Gloeckner

Hans Geissbuehler

Filippo Terrasi

Bernd Kuehnemund

Markus Meyer

A method for manufacturing a crystallizable plastic material is disclosed. The process includes the step of melting an amorphous plastic material, pelletizing the material, crystallizing it and then post condensing the plastic material with the proviso that the plastic material is not subjected to heating after the melting step but prior to the crystallization step and then subjecting the plastic material to sieving after the crystallization step.

Method and device for producing crystallizable plastic material

The invention relates to a method for treating plastic material, especially polyethylene terephthalate, wherein the relatively low temperature material is initially crystallized by heating before subjecting said material to heating or condensation in the solid phase. The material is then exposed to a hot treatment gas for at least 10 minutes in at least two chambers ( ) of an apparatus and crystallized at a temperature above 135&deg; C., e.g. 140-180&deg; C. The is subsequently heated in a preheating chamber ( ) having at least one to eight stages at a temperature of at least 185&deg; C., preferably at least 200&deg; C. and more preferably around 220&deg; C.

Device and method for treating plastic material

A shaft reactor for treating bulk material, including granular bulk material, in particular for the continuous post-condensation of PET, PEN or PA in the solid phase. A uniform product flow without significant decrease of the usable contents of the reactor and a decrease of the bulk pressure in the reactor is achieved by use of internals which are uncomplicated to fabricate. Internals are arranged in the reactor which comprise at least one ring and a plurality or ribs.

Shaft reactor for treating bulk material

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Uzwil, Switzerland

Martin Mueller