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Manufacturing method and manufacturing apparatus of stretched resin film, manufacturing method of polarizer, method of measuring moisture content of stretched resin film
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A manufacturing method and a technology of a manufacturing apparatus, which are applied in the field of manufacturing apparatuses for stretched resin films, and can solve the problems of low measurement accuracy and the like
Active Publication Date: 2022-06-28
NITTO DENKO CORP
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Problems solved by technology
However, the conventional method of measuring moisture content in the manufacturing process has a problem of low measurement accuracy
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Embodiment 1
[0088] As the polyester-based resin film, an amorphous isophthalic acid copolymer polyethylene terephthalate film (thickness: 100 μm) having a water absorption rate of 0.75% and a Tg of about 75° C. was used.
[0089] PVA obtained by mixing polyvinyl alcohol (degree of polymerization: 4200, degree of saponification: 99.2 mol%) and acetoacetyl-modified PVA (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOFMEIMAZ410") at a ratio of 9:1 To 100 parts by mass of the resin, 13 parts by mass of potassium iodide was added to prepare an aqueous PVA solution (coating liquid).
[0090] The above-mentioned PVA aqueous solution was apply|coated to one surface of a polyester-type resin film, and it dried at 60 degreeC, and the PVA-type resin layer of thickness 13 micrometers was formed by this, and the laminated body was produced.
[0091] Each of the following processes was performed while conveying the obtained laminate at a predetermined conveying speed.
[009...
Embodiment 2
[0101] In the underwater stretching treatment step, a polarizer was produced in the same manner as in Example 1, except that the boric acid concentration of the boric acid aqueous solution was 2.5% by weight. Furthermore, by the same procedure, a total of four polarizers were produced.
[0102] After the washing process, a part of the laminate was cut out, and the thickness and moisture content of the PVA-based resin layer were measured by the methods (1) and (2) above. The results are shown in Table 1 and figure 2 .
Embodiment 3
[0104] In the underwater stretching treatment step, a polarizer was produced in the same manner as in Example 1, except that the boric acid concentration of the boric acid aqueous solution was 3.6% by weight. Furthermore, by the same procedure, a total of three polarizers were produced.
[0105] After the washing process, a part of the laminate was cut out, and the thickness and moisture content of the PVA-based resin layer were measured by the methods (1) and (2) above. The results are shown in Table 1 and figure 2 .
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Abstract
The present invention provides a method and apparatus for producing a stretched resin film, a method for producing a polarizer, and a method for measuring the moisture content of a stretched resin film. Provided is a method for producing a stretched resin film whose water content has been measured with high precision. In the method for producing a stretched resin film according to the present invention, while conveying a laminate in which a water-absorbent resin layer is formed on one side of an elongated non-water-absorbing film, the laminate is sequentially subjected to underwater stretching treatment and washing treatment. , thereby forming a stretched resin film on a non-water-absorbent film, the manufacturing method comprising: measuring the thickness of the stretched resin film in a non-contact manner while conveying the laminated body after the cleaning treatment; and based on the measured The thickness of the resin film was stretched, and the moisture content of the stretched resin film after the cleaning treatment was calculated.
Description
technical field [0001] The present invention relates to a method for producing a stretched resin film, a method for producing a polarizer, a method for measuring the moisture content of a stretched resin film, and an apparatus for producing a stretched resin film. Background technique [0002] There is known a method in which, even when the thickness of the resin layer is very thin, by stretching the laminate in which the resin layer is formed on one side of an elongated film, the resin layer can be It stretched while breaking, and obtained the thin stretched resin film. As an example of such a stretched resin film, there has been proposed a method in which a laminate of a polyester-based resin film and a polyvinyl alcohol-based resin layer (PVA-based resin layer) is stretched and dyed, thereby forming a polyester-based resin film. A polarizer is formed on the film (for example, Patent Document 1). In addition, in the production line of a stretched resin film, it is requir...
Claims
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