Method for producing transparent plastic molded articles and...

Details Method for producing transparent plastic molded articles and... Method for producing transparent plastic molded articles and...

B - Operations, Transporting

29

C

18/1042, 18/1058

B29C 51/42 (2006.01) B29C 51/00 (2006.01)

Patent

CA 1089170

METHOD FOR PRODUCING TRANSPARENT PLASTIC MOLDED ARTICLES AND THERMOFORMING APPARATUS THEREFOR ABSTRACT OF THE DISCLOSURE 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, shape retention at high temperatures and other properties according to a thermoforming process. This invention, more specifically, concerns a method for producing transparent polypropylene molded articles, characterized by heating a polypropylene sheet at a temperature higher than the melting point thereof, stretching it by more than 5%, rapidly cooling it to a temperature of not more than 120°C, and then subjecting the thus treated sheet to thermoforming at a temperature below the melting point of the sheet.

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