Method for producing transparent plastic molded articles and the

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

1977-08-04

1979-02-20

Spicer, Jr., Robert L.

Plastic article or earthenware shaping or treating: apparatus

Preform reshaping or resizing means: or vulcanizing means...

Including both heating and cooling means

425398, 425445, 425DIG53, 425DIG235, B29C 1700

Patent

active

041404572

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 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: 2585915 (1952-02-01), Chavannes
patent: 3131425 (1964-05-01), Jacobs et al.
patent: 3333032 (1967-07-01), Dickinson
patent: 3570054 (1971-03-01), Seanor et al.
patent: 3608056 (1971-09-01), Nelson
patent: 3966860 (1976-06-01), Hudson et al.

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