In this short video someone from the website Atomic Shrimp explains how to identify High Density Polyethylene (HDPE) plastic and then goes on to present a hobby project in which, using domestic tools, he recycles a small quantity of HDPE into pieces that can be used in diverse craft projects.
Running time: 14 mins 50 sec. Uploaded to YouTube: 7 Dec 2012.
It is by no means an industrial process but it is a practical exposition of some of the principles behind plastic recycling. As such it might be the basis of some educational project work with young people – under proper supervision of course.
In his follow-up video he makes the resulting piece of plastic into a pulley wheel that works with Lego technic.