Plastic products have become so familiar and commonplace that people spend little thought about their production as they use them. Many plastic products are manufactured by injection molding. The list of end-products is as endless as unspectacular: Dowels, yoghurt cups, ballpoint pen hou- sings, beverage bottles, automo- tive rear lenses and bumpers, laundry baskets, buckets, contai- ners for use in medical engineering to name just a fe

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