recycleBOT

Have been looking at the variable temperature melting points and has something to do with re-melt and amount of moisture within the plastic during flake to melt stage.

If the plastic is not kept below a certain Moisture content the water has a chemical reaction within the plastic and causes it to break down back into its primary elements causing a higher temperature to re-melt again.

"Ideally the reground pet should be dried to below 0.025% moisture content before extrusion"

Seems there are generally two methods. Drying the pre-grind and then flakes, or a Vacuum in the melt and flak chamber(Seems a little intense).

hopefully we can get the extrusion and heating a little tuned and see if we really need to go down the "drying" track before investigating further.

To make our job easier we really need to keep as much moister away from pre-melted and melting pet as possible.