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US 7,108,500 B2Granted
Process and apparatus for recycling of PET-material
OwnerHelmut Bacher, Helmuth Schulz +1inventors
InventorsHelmut Bacher, Helmuth Schulz, Georg Wendelin
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OwnerHelmut Bacher, Helmuth Schulz +1inventors
InventorsHelmut Bacher, Helmuth Schulz, Georg Wendelin
Estimating the term…
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.
Apparatus for recycling of PET-material, in which the PET-material to be processed is dried, crystallized and at least one of plasticized and molten, and the melt is processed to one of PET-granulate and PET-articles, and for performing a process having first and second processing steps, the apparatus comprising a pre-processing device for carrying out the first step of pre-processing the supplied PET-material having rotatable mechanical processing elements for drying and simultaneously crystallizing the PET-material at elevated temperature and an evacuable main-processing device for carrying out the second processing step, the evacuable main-processing device having mechanical processing elements for further drying, crystallizing and temperature increase of the PET-material supplied by the pre-processing device, a screw conveyor for transporting the PET-material from the pre-processing device to the main-processing device, means for controlling the temperature of the PET-material obtained by rotational energy of the processing elements, a further device for at least one of plasticizing and melting the material after the second processing step, the further device being arranged downstream of the main-processing device, a filtration device for filtering the PET-material arranged downstream of the further device for at least one of plasticizing and melting the PET-material, and a pressure reducer for maintaining a pressure of less than 150 mbar in the main-processing device.
Apparatus for recycling PET-material and heating the PET-material by subjecting the PET-material to movement in first and second processing steps, comprising a pre-processing device for the first step for pre-processing of the PET-material and having rotatable mechanical processing elements for drying and simultaneously crystallizing and increasing the temperature of the PET-material at an elevated temperature, a main-processing device for the second step for main processing the PET-material including an evacuator adapted to establish a vacuum in the main-processing device and mechanical processing elements for further drying and crystallizing the PET-material supplied by the pre-processing device, a screw conveyor for transporting the PET-material from the pre-processing device to the main-processing device, means for controlling the temperature of the PET-material obtained by the rotational energy of the processing elements, a further device for at least one of plasticizing and melting the material after the second processing step, the further device being arranged downstream of the main-processing device, a filtration device for filtering the PET-material, the filtration device being arranged downstream of the further device for at least one of plasticizing and melting the PET-material, and a pressure reducer for maintaining a pressure of less than 150 mbar in the main-processing device.
Apparatus for recycling of PET-material, in which the PET-material to be processed is dried, crystallized and at least one of plasticized and molten, and the melt is processed to one of PET-granulate and PET-articles, and for performing a process having first and second processing steps, the apparatus comprising a pre-processing device for carrying out the first step of pre-processing the supplied PET-material having rotatable mechanical processing elements for drying and simultaneously crystallizing the PET-material at elevated temperature and a main-processing device for carrying out the second processing step, the main-processing device having a pressure reducer adapted to establish a vacuum of less than 150 mbar in the main-processing device and mechanical processing elements for further drying, crystallizing and increasing the temperature of the PET-material supplied by the pre-processing device, a screw conveyor for transporting the PET-material from the pre-processing device to the main-processing device, means for controlling the temperature of the PET-material obtained by the rotational energy of the processing elements, a further device for at least one of plasticizing and melting the material after the second processing step, the further device being arranged downstream of the main-processing device, and a filtration device for filtering the PET-material, the filtration device being arranged downstream of the further device for at least one of plasticizing and melting the PET-material.
Dependencies are inferred from the claim text.