Method for producing transparent plastic molded articles

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

1976-08-27

1978-10-03

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 92, 264 94, 264289, 264291, 264294, 264322, B29C 1704

Patent

active

041184548

ABSTRACT:
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 polypropyleneretention 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.degree. C, and then subjecting the thus treated sheet to thermoforming at a temperature below the melting point of the sheet.

REFERENCES:
patent: 3737494 (1973-06-01), Wolf
patent: 3966860 (1976-06-01), Hudson et al.

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