Method for producing a foamed polymer composite board from mixed plastic waste
AssigneeBoxs AG
InventorsChristian RYTKA, Raphael MARKSTALLER
Life of this patent
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Abstract
In a method for producing a polymer composite board from plastic waste, in which the plastic waste is processed in an extruder in a melt-kneading step to form a melt, the melt is introduced into an injector and injected under pressure into a cavity of a closed mold by the injector, in order to form a board. The melt is formed from a free-flowing agglomerate and a blowing agent. The free-flowing agglomerate is produced from unsorted, mixed plastic waste, and the melt is introduced into the closed mold via an injection nozzle along an end side of the cavity, in which mold the melt is foamed and cooled to form a foamed core layer of the polymer composite board.
Claims17
1-14. (canceled)
A process for the production of a polymer composite board from plastic waste, the process comprising:
- processing the plastic waste into a melt by a melt-kneading step in an extruder;
- introducing the melt into an injector;
- injecting under pressure from the injector into a cavity of a closed mold in order to form a board,
- wherein the melt is formed from a granulated agglomerate and a blowing agent,
- wherein the granulated agglomerate is produced from unsorted mixed plastic waste, and
- wherein the melt is introduced into the closed mold via an injection nozzle along an end/edge side of the cavity, in which mold the melt foams and cools to form a foamed core layer of the polymer composite board.
A polymer composite board produced from mixed plastic waste, comprising a core layer produced and foamed from unsorted mixed plastic waste, the core layer having been injected between an upper cover layer and a lower cover layer, wherein the core layer is blowhole-free and has a degree of foaming of at least 20%, with cell dimensions of less than 3 mm.
Dependencies are inferred from the claim text.