Process for producing cellulose resin film, apparatus therefor, and optical cellulose resin film
A cellulose resin and optical technology, applied in the direction of optical elements, flat products, polarizing elements, etc., can solve problems such as temperature inhomogeneity and viscosity inhomogeneity of molten resin, and achieve suppression of scratches, improvement of surface state, and suppression of inhomogeneity The effect of uniformity
Inactive Publication Date: 2009-08-26
FUJIFILM CORP
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Problems solved by technology
[0007] On the other hand, when the contaminants in the molten resin are removed by a filter device provided with a leaf disc filter before being formed into a film, there is a problem that when the molten resin (in particular, a molten resin having a high viscosity) passes through Scratch marks are formed when fine pores and flow channels in the filter device are formed, and scratch defects appear in the formed film by generating temperature non-uniformity and viscosity non-uniformity in the molten resin
Method used
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Embodiment
[0532] (1) Film formation of cellulose acylate film
[0533] First, at an extrusion temperature of 220° C., the cellulose acylate resin was melted by a single-screw extruder (manufactured by TOSHIBA MACHINE CO., LTD., screw diameter: φ90 mm, L / D=30, compression ratio: 3:2) (CAP-482-20, number average molecular weight: 70,000). Then, the molten cellulose acylate resin is filtered by a leaf disc filter 56 after extrusion while being kneaded by a static mixer 27 . Then, the molten cellulose acylate resin was discharged from the die 24 onto the cooling drum 26 to be solidified by cooling, thereby preparing a cellulose acylate film (undrawn) with a thickness of 100 μm at a line speed of 10 m / min. stretch). The discharge amount of the molten resin when discharged from the die 24 onto the cooling drum 26 is set to 300 to 400 (kg / h).
[0534] (2) Evaluation of cellulose acylate film (unstretched)
[0535] For the cellulose acylate film thus obtained, scratch defects caused by the ...
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A process for producing a cellulose resin film, comprising melting a cellulose resin by means of an extruder, feeding the molten resin via piping to a die and discharging the same in sheet-like form from the die onto a rotating cooling drum to thereby cool the sheet for solidification thereof, wherein the piping is provided with a filter unit having a hollow shaft circularly fitted with multiple leaf disk filters for removing of any foreign matter from the resin melted by the extruder, the filter unit further having a communication channel communicating the leaf disk filters with the interior of the shaft, and further provided with, disposed downstream of the filter unit, a static mixer equipped with element satisfying the following requirement (A), so that the molten resin having any foreign matter removed by the leaf disk filters is re-blended by means of the static mixer and fed to the die. Requirement (A): when rho refers to the viscosity of the molten resin (Pas), V to the rate of molten resin discharged (kg / h), m to the number of communication channels of the filter unit and n to the number of element rows within the static mixer, rhoxVxmxV.
Description
technical field [0001] The present invention relates to a method for producing a cellulose resin film, an apparatus thereof and an optical cellulose resin film, and in particular, to a method for producing a cellulose resin having a preferred product quality for use in liquid crystal displays Film method and device thereof and an optical cellulose resin film. Background technique [0002] Thermoplastic resin films such as cellulose acylate films are used for various optical films of liquid crystal displays, and, for example, exhibit in-plane retardation (Re) by stretching thermoplastic resin films in the longitudinal direction (length direction) and transverse direction (width direction) and retardation (Rth) in the thickness direction, and this film is used as a retardation film of a liquid crystal display, and expansion of the viewing angle has been intentionally performed (see, for example, Patent Document 1). [0003] A thermoplastic resin film is generally produced by ...
Claims
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Login to View More IPC IPC(8): B29C47/68B29C47/14C08J5/18G02B5/30B29K1/00B29C48/305B29C48/64
CPCB29C47/6018B29C47/622B29K2001/12B29C47/686B29C47/60B29C47/38B29C47/0021B29L2007/008B29C47/0057B29C47/367C08J5/18B29C47/364B29L2031/3475B29K2001/00B29L2011/00B29C47/362B29C47/62C08J2301/10B29C48/08B29C48/0018B29C48/362B29C48/37B29C48/387B29C48/395B29C48/53B29C48/64B29C48/645B29C48/693
Inventor 上田忠
Owner FUJIFILM CORP