What is Co-Extrusion with Regrind?

Some manufacturers purchase recycled plastics (regrind) for use in the substrate of their extruded profiles, mainly to reduce costs. The manufacturer may try to establish standards in terms of the previous uses or the quality of this outsourced regrind (as the quality may compromise the quality of the finished fence profile produced). However, it is very difficult to control or verify the source of the regrind purchased, as they cannot determine how many times the material was already reprocessed (which is important, as multiple processing can result in a more brittle, inferior product), nor can they be sure what the exact chemical composition of the waste product was so as to extrude it properly.

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