Method and device for feeding and treating plastic strands

B - Operations – Transporting – 29 – B

Patent

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Details

B29B 9/06 (2006.01) B29B 9/12 (2006.01) B29B 13/04 (2006.01) B29C 47/88 (2006.01) B29C 35/16 (2006.01)

Patent

CA 2340358

The invention relates to a method for feeding and treating plastic strands that are discharged from nozzles in a molten state by means of a cooling section in order to granulate the plastic strands. According to the invention, the plastic strands are partially crystallized in a temperature-adjusted liquid medium in a crystallization section once they are discharged from the nozzles, the liquid medium being maintained at a temperature above the glass transition temperature of the plastic strands. The invention further relates to a device for carrying out said method. The inventive device comprises a plastic melting device, a device for extruding the strands from nozzles, a crystallization section that is located directly downstream of the nozzles, and a granulation device that is located downstream of the crystallization section. The temperature of the crystallization section is adjusted by means of heating and/or cooling devices and is provided with temperature adjusting elements with which the temperature of the temperature-adjusted liquid medium can be adjusted to a temperature above the glass transition temperature of the plastic strands.

L'invention concerne un procédé permettant d'amener et de traiter des boudins en plastique sortant en fusion de filières et comprenant un parcours de refroidissement destiné à la granulation des boudins plastique. Dans un parcours de cristallisation, les boudins plastique sont partiellement cristallisés juste à la sortie des filières dans un agent liquide tempéré. L'agent liquide est maintenu à une température supérieure à la température de transition vitreuse des boudins en plastique. L'invention concerne également un dispositif destiné à mettre en oeuvre ce procédé. Ce dispositif présente un dispositif de plastique en fusion, un dispositif d'extrusion à l'aide de filières, une section de parcours de cristallisation située immédiatement en aval des buses, et un dispositif de granulation implanté en aval de la section de parcours de cristallisation. Aux fins de régulation de température du parcours de cristallisation, le dispositif présente des équipements de chauffage et/ou de refroidissement, ainsi que des dispositifs de régulation de température qui permettent de régler l'agent liquide tempéré à une température supérieure à la température de transition vitreuse des boudins plastique.

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