PROCESS FOR PRODUCING THERMOPLASTIC RESIN FILM
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United States of America Patent
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Apr 9, 2013
filing date -
Sep 25, 2007
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Abstract
According to a process for producing a thermoplastic resin film according to one aspect of the present invention, a molten resin, while the molten resin is discharged from a die and thereafter lands onto a cooling roller, is uniformly heated in a direction of a flow by a heater. Thereby, a thermoplastic resin film having very slight thickness unevenness in a longitudinal direction can be formed. Moreover, according to the process for producing a thermoplastic resin film, heating by the heater can reduce a viscosity of the molten resin at the time of landing, and can suppress generation of retardation at the time of landing.
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