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US 5,472,997 AGranted
Process for reprocessing plastic wastes
AssigneeSICOWA Verfahrenstechnik fur Baustoffe GmbH & Co. KG
InventorsThomas Koslowski, Wolfgang Schmitz, Olaf Musebrink
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Abstract
The invention relates to a process for reprocessing plastic wastes, in which the plastic wastes filled into vessels are autoclaved as coherent, porous bundles with high water absorption capacity in a steam atmosphere at approximately 150.degree. to 220.degree. C., preferably 165.degree. to 190.degree. C., and melted by this means, at the end of the autoclaving process, the resulting bodies of molten plastic are at least partly dried by re-evaporating the water contained therein and are cooled.
Claims28
A process for reprocessing plastic wastes comprising the steps of:
- precomminuting plastic waste then bundling the comminuted plastic waste into coherent, porous water absorbing bundles so that water can move throughout the bundle;
- introducing the prepared waste plastic in bundled form into a vessel;
- autoclaving the waste plastic in a pressurized steam atmosphere at a temperature of approximately 150.degree.-220.degree. C. and at pressures of approximately 5 to 16 bar so that heat transporting moisture penetrates the porous bundle and the plastic waste is melted sufficiently to fuse the plastic waste together in the bundled form;
- at least partially drying the fused plastic bundle at the conclusion of autoclaving by evaporating water contained in the fused plastic waste bundle;
- and
- cooling the fused plastic waste.
3 more elements
Dependencies are inferred from the claim text.