This invention provides a simple and advantageous method for producing plastic moldings with good surface gloss, very excellent transparency and high stiffness from crystalline polypropylene sheets manufactured by a generally employed industrial method without adversely affecting mechanical strength,...http://www.google.fr/patents/US4118454?utm_source=gb-gplus-shareBrevet US4118454 - Method for producing transparent plastic molded articles
Method for producing transparent plastic molded articles
