Process and apparatus for recycling of pet-material

B - Operations – Transporting – 29 – B

Patent

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B29B 17/00 (2006.01) B29B 13/06 (2006.01) C08J 11/06 (2006.01)

Patent

CA 2388380

Within a process for recycling of PET-material and/or objects of PET, the PET-material to be processed is heated and dried in the course of a pre- treatment step and simultaneously is crystallized at elevated temperature. This pre-treatment step is followed by a main-treatment step under vacuum. In this main-treatment step, the processed material is again dried and crystallized at a temperature that is higher than the temperature of the pre-treatment step. Preferably, also in the main-treatment step no plasticizing of the material takes place, the plasticizing or, respectively, melting of the material takes place only after the main-processing step. An apparatus for performing this process comprises a pre-processing device (3) in which the processed material is dried and simultaneously crystallized at elevated temperature, and, if desired, is also comminuted. A main-processing device (4) is connected to this pre-processing device (3), in which main-processing device the supplied PET-material is dried, crystallized and heated to a temperature that is higher than the temperature within the pre-treatment device.

L'invention concerne un procédé de recyclage de matériau PET et/ou d'objets en PET. Ce procédé comprend un prétraitement consistant à chauffer et à sécher le matériau PET à traiter et simultanément à le cristalliser à une température élevée. Ce traitement principal sous vide succède à ce prétraitement. Dans ce traitement principal, le matériau à traiter est à nouveau séché et cristallisé à une température supérieure à la température de prétraitement. Pendant le traitement principal, il ne se produit, de préférence, aucune plastification de la matière, la plastification ou la fusion de la matière s'effectuant seulement après l'opération de traitement principal. Un dispositif selon l'invention, présente un dispositif de prétraitement (3) dans lequel le matériau à traiter est séché à une température élevée et simultanément cristallisé, éventuellement aussi broyé. Ce dispositif de prétraitement (3) est raccordé à un dispositif de traitement principal (4) dans lequel le matériau PET amené est cristallisé et chauffé à une température qui est supérieure à celle du dispositif de prétraitement.

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