JP3856280B2 - Storage or transportation method of optical polyvinyl alcohol polymer film - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for storing or transporting an optical polyvinyl alcohol-based polymer film that has uniform optical performance even in a large area and is suitable for use in a large liquid crystal display screen.
[0002]
[Prior art]
A polarizing plate having a light transmission and shielding function is a basic component of a liquid crystal display (LCD) together with a liquid crystal having a light switching function. The field of application of this LCD has expanded from small devices such as calculators and wristwatches in the early stages of development to laptop computers, word processors, liquid crystal color projectors, in-vehicle navigation systems, and liquid crystal televisions in recent years. Accordingly, there has been a demand for a polarizing plate that is superior in uniformity of optical performance such as brightness and sharpness in a larger area than conventional products.
[0003]
The polarizing plate generally uniaxially stretches and dyes a polyvinyl alcohol polymer film (hereinafter, the polyvinyl alcohol polymer may be abbreviated as “PVA” and the polyvinyl alcohol polymer film may be abbreviated as “PVA film”). Thus, a protective film such as a cellulose triacetate (TAC) film is bonded to both surfaces of the polarizing film manufactured by the above method.
[0004]
The storage or transportation of the PVA film is usually performed in the state of a film roll formed by winding the PVA film around a cylindrical core. In addition, the powder for slip for improving the slip of the roll-wrapped PVA films may adhere to the PVA film surface.
[0005]
In the case of general textile product packaging, mold release, agricultural use, or water-soluble packaging other than optical use, after film rolls were packaged, they were stored or transported by horizontal stacking or vertical stacking. The film rolls have been devised on both sides, such as side-by-side cardboard packaging or the entire packaging in a cardboard box, in order to prevent damage due to contact with the pallet floor surface, especially in vertical stacking. It was.
[0006]
On the other hand, in the case of optical use such as a polarizing film, the film roll is made of polyethylene, polypropylene, aluminum vapor deposited film, kraft paper, single simple packaging of cardboard or double packaging of a combination of two or more. Stacking is strictly prohibited because the bottom film grounded due to its own weight is deformed, and so it has been devised to cope with vertical stacking.
[0007]
[Problems to be solved by the invention]
However, even if the film rolls are stacked vertically, the conventional roll roll with a PVA film length of about 1000 m did not reveal the problem, but the roll roll weight increased with the recent roll roll length increase. As a result, the roll end face is damaged at the contact surface with the pallet due to its own weight, and as a result, for example, when the film is stretched in the manufacturing process of the polarizing film, the film is frequently cut.
[0008]
Furthermore, with the enlargement of the liquid crystal display screen, a wide PVA film having a film width of 2 m or more has been required as a material for the polarizing film. Accordingly, when a film roll having a film width of 2 m or more is stored or transported in a vertical stack as in the prior art, problems such as overturning occur due to the poor balance of the roll form.
[0009]
An object of the present invention is to provide a method for storing or transporting an optical polyvinyl alcohol film suitable for large liquid crystal display screen applications and the like, which ensures uniform optical performance even in a large area.
[0010]
[Means for Solving the Problems]
To achieve the above object, storage or transportation method of the optical PVA film according to the present invention comprises a support base having a base and a horizontal frame portion of the upper, both sides a pair of said support base connecting plate An optical PVA film having a thickness of 40 μm to 120 μm, a film width of 2 m or more, and a length of 1500 m or more is wound around a core made of cylindrical aluminum. The formed film roll having a weight of 470 kg or more is double-wrapped, and the projecting portions of the core projecting from the both end surfaces of the film roll by a predetermined length are placed on the frame portion of the mount and supported by the core. By this, it is characterized by holding in a suspended state.
[0011]
According to this invention, the film roll is held in a suspended state and stored or transported, so that the grounding of the film roll is prevented, so that the optical PVA film forming the film roll is scratched or deformed. Therefore, uniform optical performance can be ensured even in a large area.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a method for storing or transporting an optical PVA film according to the first embodiment of the present invention.
[0013]
The optical PVA film 1 is wound around, for example, a cylindrical core 2 to form a film roll 3. The core 2 is provided in such a length that it protrudes somewhat from both end faces of the film roll 3. The core 2 is made of, for example, a paper tube, a vinyl chloride tube, an aluminum tube, or the like. The film roll 3 is supported by a pair of upright support plates 5 and 5 at both ends of the core 2. The support plate 5 is provided with, for example, a cylindrical protrusion 6 that protrudes outwardly at a substantially central portion of the surface, and the protrusion 6 is fitted to the inner surfaces of both ends of the cylindrical core 2. To do. The support plate 5 is made of, for example, a veneer plate or a plastic plate, and the protruding portion 6 is made of, for example, a polypropylene collar (plug).
[0014]
A pair of upright support plates 5 and 5 are arranged at both ends of the film roll 3 so that the protruding portions 6 and 6 face each other, and the protruding portions 6 are fitted to the inner surfaces of both ends of the core 2. Thus, the film roll 3 is held in a suspended state and stored or transported. The film roll 3 is preferably made of, for example, a polyethylene film and the entire outer surface thereof is packaged. Thereby, since the grounding of the film roll 3 is prevented, the optical PVA film 1 forming the film roll 3 is not damaged or deformed, so that uniform optical performance can be ensured even in a large area.
[0015]
FIG. 2 is a block diagram showing a method for storing or transporting an optical PVA film according to the second embodiment of the present invention.
The optical PVA film 1 is wound around a cylindrical core 12 to form a film roll 13. The core 12 has both end portions (projecting portions) 12 a and 12 a that protrude from the both end surfaces of the film roll 13 by a predetermined length. The core 12 is made of, for example, an aluminum tube.
[0016]
The film roll 13 is supported by the gantry 10 at both ends 12 a and 12 a of the core 12. The gantry 10 is formed by connecting a pair of support bases 11 on both sides with a connecting plate 17. The support base 11 is formed by horizontally extending a frame portion 16 between support columns 15 and 15 at both ends of a base 14. Both end portions 12 a and 12 a of the core 2 are placed on the frame portion 16 of each support base 11. The gantry 10 is made of aluminum, for example. That is, both ends 12a and 12a of the core 12 are placed on the frame portions 16 and 16 of the gantry 10, and the core 12 is supported to hold the film roll 13 in a suspended state for storage or transportation. It can be carried out. The film roll 13 is preferably made of, for example, a polyethylene film and the entire outer surface thereof is packaged. Thereby, since the grounding of the film roll 13 is prevented, the optical PVA film 1 forming the film roll 13 is not damaged or deformed, so that uniform optical performance can be ensured even in a large area.
[0017]
In the first and second embodiments, it is preferable that the film roll wrapped in a film is further devised such as being stored in a secondary package such as a cardboard packing case with a cushioning material or the like.
[0018]
As PVA which comprises the PVA film used for this invention, what saponified the vinyl ester type polymer obtained by carrying out vinyl ester type monomer polymerization and made the vinyl ester unit into the vinyl alcohol unit can be used. Examples of the vinyl ester monomers include vinyl formate, vinyl acetate, vinyl propionate, vinyl valelate, vinyl laurate, vinyl stearate, vinyl benzoate, vinyl pivalate, vinyl versatate and the like. Of these, vinyl acetate is preferably used.
[0019]
When the vinyl ester monomer is polymerized, if necessary, other monomers that can be copolymerized are within a range that does not impair the effects of the invention (preferably 15 mol% or less, more preferably 5 mol% or less). Can also be copolymerized.
[0020]
Examples of the monomer copolymerizable with the vinyl ester monomer include olefins having 3 to 30 carbon atoms such as ethylene, propylene, 1-butene and isobutene; acrylic acid and salts thereof; methyl acrylate and acrylic acid. Acrylics such as ethyl, n-propyl acrylate, i-propyl acrylate, n-butyl acrylate, i-butyl acrylate, t-butyl acrylate, 2-ethylhexyl acrylate, dodecyl acrylate, octadecyl acrylate, etc. Acid esters; methacrylic acid and salts thereof; methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, i-propyl methacrylate, n-butyl methacrylate, i-butyl methacrylate, t-butyl methacrylate, methacrylic acid 2-ethylhexyl, dodecyl methacrylate Methacrylic acid esters such as octadecyl methacrylate; acrylamide, N-methylacrylamide, N-ethylacrylamide, N, N-dimethylacrylamide, diacetoneacrylamide, acrylamidepropanesulfonic acid and its salt, acrylamidopropyldimethylamine and its salt, N Acrylamide derivatives such as methylolacrylamide and its derivatives; methacrylamide, N-methylmethacrylamide, N-ethylmethacrylamide, methacrylamidepropanesulfonic acid and its salts, methacrylamidepropyldimethylamine and its salts, N-methylolmethacrylamide and Methacrylamide derivatives such as derivatives thereof; N-vinylformamide, N-vinylacetamide, N-vinylpyrrolidone, etc. -Vinyl amides; Vinyl ethers such as methyl vinyl ether, ethyl vinyl ether, n-propyl vinyl ether, i-propyl vinyl ether, n-butyl vinyl ether, i-butyl vinyl ether, t-butyl vinyl ether, dodecyl vinyl ether, stearyl vinyl ether; acrylonitrile, methacrylonitrile Nitriles such as vinyl chloride, vinylidene chloride, vinyl fluoride, vinylidene fluoride, etc .; allyl compounds such as allyl acetate and allyl chloride; maleic acid and its salts or esters; itaconic acid and its salts or Its esters; vinylsilyl compounds such as vinyltrimethoxysilane; N such as isopropenyl acetate, N-vinylformamide, N-vinylacetamide, N-vinylpyrrolidone -Vinylamides can be mentioned.
[0021]
The degree of polymerization of PVA constituting the PVA film is preferably 500 or more from the viewpoint of film strength, more preferably 1000 or more from the viewpoint of optical performance such as polarization performance, more preferably 2000 or more, and particularly preferably 3500 or more. Furthermore, the upper limit of the polymerization degree of PVA is preferably 10,000 or less from the viewpoint of film formability.
[0022]
The polymerization degree Po of the PVA is measured according to JIS K 6726. That is, after re-saponifying and purifying PVA, it is obtained by the following formula from intrinsic viscosity [η] (unit: deciliter / g) measured in water at 30 ° C.
P0 = ([[eta]] * 10 < ³ > /8.29) ^{(1 / 0.62)}
[0023]
The saponification degree of PVA constituting the PVA film is preferably 90 mol% or more, more preferably 95 mol% or more, and most preferably 98 mol% or more from the viewpoint of the durability of the film. Furthermore, 99.99 mol% or less is preferable from the viewpoint of dyeability of the film.
[0024]
The saponification degree indicates the ratio of units that are actually saponified to vinyl alcohol units among units that can be converted to vinyl alcohol units by saponification. The saponification degree of PVA was measured by the method described in JIS.
[0025]
When producing a PVA film, it is preferable to add a polyhydric alcohol as a plasticizer. Examples of the polyhydric alcohol include ethylene glycol, glycerin, propylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, trimethylolpropane, and the like, and one or more of these may be used. it can. Among these, ethylene glycol or glycerin is preferably used because of the effect of improving stretchability.
[0026]
The addition amount of the polyhydric alcohol is preferably 1 to 30 parts by weight, more preferably 3 to 25 parts by weight, and most preferably 5 to 20 parts by weight with respect to 100 parts by weight of PVA. If the amount is less than 1 part by weight, the dyeability and stretchability may be lowered. If the amount is more than 30 parts by weight, the film may be too soft and the handleability may be lowered.
[0027]
It is preferable to add a surfactant when producing the PVA film. The type of the surfactant is not particularly limited, but an anionic or nonionic surfactant is preferable. As the anionic surfactant, for example, a carboxylic acid type such as potassium laurate, a sulfate type such as octyl sulfate, and a sulfonic acid type anionic surfactant such as dodecylbenzene sulfonate are suitable. Nonionic surfactants include, for example, alkyl ether types such as polyoxyethylene oleyl ether, alkylphenyl ether types such as polyoxyethylene octylphenyl ether, alkyl ester types such as polyoxyethylene laurate, and polyoxyethylene laurylamino. Alkylamine type such as ether, alkylamide type such as polyoxyethylene lauric acid amide, polypropylene glycol ether type such as polyoxyethylene polyoxypropylene ether, alkanolamide type such as oleic acid diethanolamide, polyoxyalkylene allyl phenyl ether, etc. Nonionic surfactants such as allyl phenyl ether type are preferred. These surfactants can be used alone or in combination of two or more.
[0028]
The addition amount of the surfactant is preferably 0.01 to 1 part by weight, more preferably 0.02 to 0.5 part by weight, and particularly preferably 0.05 to 0.3 part by weight with respect to 100 parts by weight of PVA. . When the amount is less than 0.01 part by weight, the effect of improving stretchability and dyeing property is hardly exhibited, and when the amount is more than 1 part by weight, it may elute on the film surface and cause blocking, resulting in a decrease in handleability.
[0029]
As a method for producing a PVA film, for example, using a PVA solution in which PVA is dissolved in a solvent, a casting film forming method, a wet film forming method (discharging into a poor solvent), a gel film forming method (PVA aqueous solution) Once the gel is cooled and gelled, the solvent is extracted and removed to obtain a PVA film), a method based on a combination thereof, or a melt-extruded product obtained by melting a hydrous PVA (which may contain an organic solvent). It can be manufactured by a membrane method or the like. Among these, the casting film forming method and the melt extrusion film forming method are preferable because a good optical PVA film can be obtained.
[0030]
Examples of the solvent for dissolving PVA used in producing the PVA film include dimethyl sulfoxide, dimethylformamide, dimethylacetamide, N-methylpyrrolidone, ethylene glycol, glycerin, propylene glycol, diethylene glycol, triethylene glycol, and tetraethylene. Glycol, trimethylolpropane, ethylenediamine, diethylenetriamine, glycerin, water and the like can be mentioned, and one or more of these can be used. Among these, dimethyl sulfoxide, water, or a mixed solvent of glycerin and water is preferably used.
[0031]
The volatile content of the PVA solution or water-containing PVA (which may contain an organic solvent) used when producing the PVA film is preferably 50 to 90% by weight, and more preferably 55 to 80% by weight. If the volatile fraction is less than 50% by weight, the viscosity becomes high and film formation becomes difficult. If the volatile fraction is greater than 90% by weight, the viscosity is low and the film thickness uniformity is liable to be impaired, such being undesirable.
[0032]
The average thickness of the PVA film is preferably 20 to 150 μm, more preferably 40 to 120 μm. When the average thickness is less than 20 μm, stretching breakage may occur due to uniaxial stretching when producing a polarizing film. If the average thickness exceeds 150 μm, stretch spots may occur due to uniaxial stretching when producing a polarizing film.
[0033]
The film width of the PVA film is preferably 2 m or more, more preferably 2.3 m or more, further preferably 2.6 m or more, particularly preferably 3 m or more, and 3.5 m or more. Most preferred. When the film width is less than 2 m, the influence of the bowing phenomenon due to drum film formation is easily received on the entire film including the vicinity of the center of the film, and a polarizing film with uniform optical performance may not be obtained. If the film width exceeds 6 m, it may be difficult to stretch uniformly by uniaxial stretching when producing a polarizing film.
[0034]
The slip powder referred to in the present invention is attached to the surface of a PVA film for the purpose of improving the slip property between rolled PVA films. For example, various starch-based organic powders, calcium carbonate, calcium sulfate And inorganic powders such as magnesium carbonate, magnesium sulfate, silicic acid, talc and clay. The average particle size of these fine powders is preferably 1 to 100 μm, more preferably 5 to 20 μm.
[0035]
Adhesion amount of the slip powder of the PVA film surface is at 0.01 g / m ² or less, preferably 0.005 g / m ² or less, 0 g / m ² (no powder deposition) are particularly preferred. When the powder adhesion amount exceeds 0.01 g / m ² , the pre-swelling tank and the dyeing tank when the polarizing film is produced by the wet stretching method described later may be heavily contaminated with the powder. Moreover, when manufacturing a polarizing film with a dry-heat extending method, the stretching spot etc. by uniaxial stretching may generate | occur | produce.
[0036]
In order to produce a polarizing film from the PVA film of the present invention, for example, the PVA film may be dyed, uniaxially stretched, fixed, dried, and further heat treated as necessary. The order of each process is not particularly limited, and two processes such as dyeing and uniaxial stretching may be performed simultaneously. Each process may be repeated a plurality of times.
[0037]
Dyeing can be performed before uniaxial stretching, at the time of uniaxial stretching, or after uniaxial stretching. However, since PVA film tends to increase the degree of crystallinity due to uniaxial stretching, the dyeability may be lowered. It is preferable to dye during the process or the uniaxial stretching process. As dyes used for dyeing, iodine-potassium iodide; direct black 17, 19, 154; direct brown 44, 106, 195, 210, 223; direct red 2, 23, 28, 31, 37, 39, 79, 81 , 240, 242, 247; Direct Blue 1, 15, 22, 78, 90, 98, 151, 168, 202, 236, 249, 270; Direct Violet 9, 12, 51, 98; Direct Green 1, 85; Direct Dichromatic dyes such as yellow 8, 12, 44, 86, 87; direct orange 26, 39, 106, 107 can be used. Dyeing can usually be performed by immersing the PVA film in a solution containing the dye, but the treatment conditions and treatment method are not particularly limited.
[0038]
Uniaxial stretching can be performed by a wet stretching method or a dry heat stretching method, and can be performed in warm water (in a solution containing the dye or in a fixing treatment bath described later) or in the air using a film after water absorption. From the point of uniformity of optical performance, it is most preferable that the stretching apparatus uses a roll stretching method using a speed difference between rolls, but even with other stretching methods, a PVA film having a film width of 2 m or more is used. If used, the effect of improving the uniformity of optical performance can be obtained.
[0039]
The draw ratio is preferably 4 times or more, particularly preferably 5 times or more. If the draw ratio is less than 4, it is difficult to obtain practically sufficient polarization performance and durability performance. The stretching may be performed in one step up to the target stretching ratio, but the neck-in is further reduced and the optical performance is more uniform when performing the multi-step stretching of two or more steps. The thickness of the film after stretching is preferably from 3 to 75 μm, more preferably from 10 to 50 μm.
[0040]
For the purpose of strengthening the adsorption of the dye to the PVA film, a fixing treatment is performed. Usually, boric acid and a boron compound are added to the treatment bath used for the fixing treatment. Moreover, you may add an iodine compound in a processing bath as needed.
[0041]
It is preferable to perform the drying process (heat processing) of a polarizing film at 30-150 degreeC, and it is more preferable to carry out at 50-150 degreeC.
[0042]
The polarizing film obtained as described above is usually used as a polarizing plate by attaching a protective film optically transparent and having mechanical strength on both sides or one side. As the protective film, a cellulose acetate film, an acrylic film, a polyester film or the like is usually used.
[0043]
【Example】
Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited thereto.
[0047]
Example 1
The weight of a PVA film (no slip powder adhering) having a width of 2.8 m and a length of 2000 m consisting of 100 parts by weight of PVA having a degree of saponification of 99.9 mol% and a degree of polymerization of 1700 and 12 parts by weight of glycerin was about 550 kg. . After the film roll is double-wrapped with a polyethylene film, as shown in FIG. 1, the polypropylene of the boards 5 and 5 made of a veneer composite so as not to ground the film roll 3 (film packaging not shown). Corrugated packing ( not shown) is held by holding the film roll 3 in a suspended state by fitting the made collars (plugs) 6 and 6 to the inner surfaces of both ends of the core 2 made of a vinyl chloride tube of the film roll 3. Stored in a case. After standing for 1 month at room temperature, the appearance of the film roll was observed, but no particular change was observed.
[0048]
The PVA film was processed in the order of pre-swelling, dyeing, uniaxial stretching, fixing treatment, drying and heat treatment to prepare a polarizing film. That is, the PVA film was pre-swelled by immersing in water at 30 ° C. for 3 minutes and immersed in an aqueous solution at 40 ° C. having an iodine concentration of 0.4 g / liter and a potassium iodide concentration of 40 g / liter for 4 minutes. Subsequently, roll type uniaxial stretching was performed 5.0 times in a 50% aqueous solution of boric acid 4%. Further, it was immersed in a 30 ° C. aqueous solution of potassium iodide 40 g / liter and boric acid 40 g / liter for 5 minutes for fixing treatment. The film was taken out, dried with hot air at 40 ° C. under a constant length, and further heat-treated at 100 ° C. for 5 minutes.
The thickness of the obtained polarizing film is 26 μm, the polarizing film is sandwiched between two polarizing plates in a crossed Nicol state at an angle of 45 °, and optical spots are not observed even when the transmitted light is visually observed. It was good.
[0049]
Example 2
The weight of a PVA film having a saponification degree of 99.9 mol%, a polymerization degree of 2400 PVA of 100 parts by weight and a glycerin of 14 parts by weight of 2.9 m and a length of 2,000 m (no adhesion of slip powder) was about 570 kg. . After the film roll is double-wrapped with a polyethylene film, as shown in FIG. 2, both ends of the core 12 made of an aluminum tube of the film roll 13 are arranged so as not to ground the film roll 13 (film packaging is not shown). The parts 12a and 12a were placed on the frame members 16 and 16 of the aluminum gantry 10, and the film roll 13 was held in a suspended state. After standing at room temperature for 1 month, the appearance of the film roll 13 was observed, but no particular change was observed.
[0050]
The PVA film was processed in the same manner as in Example 1 to obtain a polarizing film having a thickness of 29 μm. Even when the polarizing film was sandwiched between two polarizing plates in a crossed Nicol state at an angle of 45 ° and the transmitted light was visually observed, no optical spots were observed, which was good.
[0051]
Example 3
The weight of a PVA film having a saponification degree of 99.9 mol%, a polymerization degree of 4000 PVA 100 parts by weight and a glycerin 11 parts by weight of a PVA film having a width of 3.2 m and a length of 1500 m (no adhesion of powder for slip) was about 470 kg. . After the film roll was double-wrapped with a polyethylene film, the film roll was held suspended in the same manner as in Example 2 . After standing for 1 month at room temperature, the appearance of the film roll was observed, but no particular change was observed.
[0052]
The PVA film was processed in the same manner as in Example 1 to obtain a polarizing film having a thickness of 28 μm. Even when the polarizing film was sandwiched between two polarizing plates in a crossed Nicol state at an angle of 45 ° and the transmitted light was visually observed, no optical spots were observed, which was good.
[0053]
Comparative Example 1
As in Example 1, a PVA film having a film width of 1.8 m and a length of 2000 m (no powder for slip adhesion: weight of about 350 kg) was double-wrapped with a polyethylene film, and then a film roll was corrugated on a wooden pallet. Was placed horizontally on a double layer. After standing for 1 month at room temperature, the appearance of the film roll was observed. The bottom part that is in direct contact with the pallet is slightly deformed and partly blocked, and when the film is unwound from the film roll, there is a defect at the end, and the film is frequently cut when creating the polarizing film. did.
[0054]
The PVA film was barely processed in the same manner as in Example 1 to obtain a polarizing film having a thickness of 30 μm. The obtained polarizing film was sandwiched between two polarizing plates in a crossed Nicol state at an angle of 45 °, and the transmitted light was visually observed, but optical spots were observed in which the dark and thin portions coexist locally. As a result, it was poor as a polarizing film.
[0055]
Comparative Example 2
The same PVA film with a film width of 3.2 m and a length of 1500 m as in Example 3 (no slip powder adhered: weight of about 470 kg) was double-wrapped with polyethylene film, and then the film roll was corrugated on a wooden pallet. Was placed horizontally on a double layer. After standing for 1 month at room temperature, the appearance of the film roll was observed. The bottom part that is in direct contact with the pallet is deformed by its own weight, partly there is blocking, when unwinding the film from the film roll, there is a defect at the end, and the film is cut when creating the polarizing film It occurred frequently.
[0056]
The PVA film was barely processed in the same manner as in Example 1 to obtain a polarizing film having a thickness of 28 μm. The obtained polarizing film was sandwiched between two polarizing plates in a crossed Nicol state at an angle of 45 °, and the transmitted light was visually observed, but optical spots with dark and lightly stained parts were observed as a whole. As a result, it was poor as a polarizing film.
[0057]
Example 4
To a PVA film having a saponification degree of 99.9 mol%, a polymerization degree of 2400 PVA of 100 parts by weight and a glycerin of 13 parts by weight, a film width of 2.9 m, and a length of 2500 m, a slip powder (MS-550S manufactured by Nikka Corporation) attached amount was coated to a 0.005 g / m ^2. The film roll had a weight of about 720 kg. After the film roll was double-wrapped with a polyethylene film, the film roll was held suspended in the same manner as in Example 2 . After standing for 1 month at room temperature, the appearance of the film roll was observed, but no particular change was observed.
[0058]
The PVA film was processed in the same manner as in Example 1 to obtain a polarizing film having a thickness of 29 μm. No staining spots are observed in the polarizing film, and even if the obtained polarizing film is sandwiched at an angle of 45 ° between two polarizing plates in a good and crossed Nicol state, the optical spots are not observed even when the transmitted light is visually observed. It was not recognized and was good.
[0059]
【The invention's effect】
As described above, according to the method for storing or transporting an optical PVA film of the present invention, the optical PVA film can ensure uniform optical performance even in a large area as compared with the conventional method.
[Brief description of the drawings]
FIG. 1 is a configuration diagram illustrating a method for storing or transporting an optical PVA film according to a first embodiment of the present invention.
FIG. 2 is a configuration diagram illustrating a method for storing or transporting an optical PVA film according to a second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Optical polyvinyl alcohol polymer film, 2, 12 ... Core, 3, 13 ... Film roll, 5 ... Support plate, 6 ... Projection part, 10 ... Mount.

Claims (3)

Includes a support base having a base and a horizontal frame portion of the upper has a frame formed by connecting both side pair of the support base by a connecting plate, a film thickness of at 40Myuemu～120myuemu, film width is 2m A film roll having a weight of 470 kg or more formed by wrapping an optical polyvinyl alcohol polymer film having a length of 1500 m or more around a core made of cylindrical aluminum is wrapped twice, and both ends of the film roll An optical polyvinyl alcohol system characterized in that the core protruding from the surface by a predetermined length is placed on the frame portion of the gantry and supported by the core so as to be held in a suspended state. A method for storing or transporting a polymer film. 2. The optical polyvinyl alcohol polymer according to claim 1 , wherein the adhesion amount of the powder for slip adhering to the surface of the optical polyvinyl alcohol polymer film is 0.01 g / m ² or less. How to store or transport film.   The method for storing or transporting an optical polyvinyl alcohol polymer film according to claim 1 or 2, wherein the polyvinyl alcohol polymer film is for a polarizing film.

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