| CPC B29B 17/02 (2013.01) [B01D 19/0031 (2013.01); B01D 36/001 (2013.01); B29B 9/02 (2013.01); B29C 48/69 (2019.02); B29C 48/694 (2019.02); B29B 2017/0217 (2013.01); B29B 2017/0255 (2013.01)] | 9 Claims |
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1. A method for recycling and processing plastics, comprising:
in a plurality of successive process steps:
1.1. melting a thermoplastic polymer using a melting extruder to provide a plastic melt;
1.2. performing a first filtering of the plastic melt under a pressure of more than an atmospheric pressure;
1.3. degassing during a second filtering of the plastic melt under a vacuum atmosphere, wherein degassing during the second filtering includes:
passing the plastic melt output from the first filtering through a degassing unit to remove solid foreign particles and volatile gases from the plastic melt in a single process step, and
1.4. discharging the plastic melt for final processing;
wherein the degassing unit includes:
a housing defining a melt inlet, a melt outlet, and a vacuum chamber disposed between the melt inlet and the melt outlet; and
a filter element arranged within the vacuum chamber, the filter element having a hollow, elongated interior defining a pressure chamber connected to the melt inlet;
wherein the filter element defines an inlet surface and an outlet surface, the outlet surface facing an interior of the vacuum chamber; and
wherein the step of passing the plastic melt through the degassing unit includes:
feeding the plastic melt through the inlet surface to the outlet surface to remove the solid foreign particles, and exposing the plastic melt to a vacuum of the vacuum chamber to remove the volatile gases.
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