We did a further experiment with laminating flat bits of plastic milk jugs (#2 HDPE), and ended up with a strong, flat little chunk of plastic. It's four layers thick, two inches long, and barely bends when I try to flex it. The translucent jug plastic turns transparent when it is very hot.
It made sense to build it up by adding one new layer at a time, instead of doing them all at once, partly because the pieces were small and tended to slide around, and partly so that the center would be heated enough to fuse well.
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