PROCESS FOR PREPARING CLEAR POLYOXYMETHYLENE FILM

A clear crystalline polyoxymethylene film prepared by the process comprising preheating the film to a temperature not lower than 20 DEG C. below a temperature within the range from that at which polyoxymethylene crystals begin to melt to that at which polyoxymethylene crystals finish melting, and ro...

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Bibliographic Details
Main Authors YUASA; TAKEO, SHIMURA; KAZUHIKO, SASAGURI; KIICHIRO
Format Patent
LanguageEnglish
Published 01.04.1975
Subjects
AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
PERFORMING OPERATIONS
SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR
SHAPING OR JOINING OF PLASTICS
TRANSPORTING
WORKING OF PLASTICS
WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Summary:A clear crystalline polyoxymethylene film prepared by the process comprising preheating the film to a temperature not lower than 20 DEG C. below a temperature within the range from that at which polyoxymethylene crystals begin to melt to that at which polyoxymethylene crystals finish melting, and rolling the preheated film to a thickness not greater than 95 percent of the original thickness through heated pressing rollers while maintaining the temperature of the film within the aforementioned range and simultaneously or immediately stretching the thus rolled film to such an extent that the thickness of the stretched film is reduced from 1/1.2 to 1/6 of the original thickness.
Bibliography:Application Number: US19720291571