Trying to melt thin sheets of HDPE (3mm thick_)
so I am trying to melt shredded HDPE plastic into thin sheets of about 3mm which I then plan to mill with a CNC machine. I have had a couple of goes at it and the end result isn’t great.
I made a frame out of MDF that was 3mm thick. I pressed the plastic into the frame using a heat press. After the plastic had melted I pressed the plastic and frame between other bits of wood held together with clamps until it had completely cooled. When I removed the clamps I found that the plastic sheet warped/bent. I have tried a couple of times with the same result.
Has anyone got any suggestions how I can stop the plastic from bending/warping. For it to work in the CNC Machine I need the plastic to be a flat sheet.
3 mm is pretty thin. I wonder if you could set up a straightening pair of platens that heats it up below melting and cools uniformly on both sides.
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