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Plastic Recycling
There are many methods for making materials that are dubbed plastic. Many different chemicals, most are petroleum based, are used for making plastic. A short history and a summary of some of the many methods of producing plastic pieces is given below. (plasticmatrix)
Although plastics have been around for centuries, the processing of man-made varieties is a relatively modern phenomenon. The first injection-molding machine was patented in the 1870's and together with profile extrusion, came into common commercial usag…
