Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
  • B65H75/02—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks
  • B65H75/04—Kinds or types
  • B65H75/08—Kinds or types of circular or polygonal cross-section
  • B65H75/10—Kinds or types of circular or polygonal cross-section without flanges, e.g. cop tubes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
  • B29C41/34—Component parts, details or accessories; Auxiliary operations
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C13/00—Rolls, drums, discs, or the like; Bearings or mountings therefor
  • F16C13/006—Guiding rollers, wheels or the like, formed by or on the outer element of a single bearing or bearing unit, e.g. two adjacent bearings, whose ratio of length to diameter is generally less than one
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B5/00—Optical elements other than lenses
  • G02B5/30—Polarising elements
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B5/00—Optical elements other than lenses
  • G02B5/30—Polarising elements
  • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
  • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2701/00—Handled material; Storage means
  • B65H2701/50—Storage means for webs, tapes, or filamentary material
  • B65H2701/51—Cores or reels characterised by the material
  • B65H2701/512—Cores or reels characterised by the material moulded
  • B65H2701/5124—Metals
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C2326/00—Articles relating to transporting
  • F16C2326/58—Conveyor systems, e.g. rollers or bearings therefor

Definitions

• the present invention relates to a polyvinyl alcohol film roll, and more particularly to a polyvinyl alcohol film roll obtained by winding a wide and long polyvinyl alcohol film, and a polarizing film excellent in polarization performance obtained by using the polyvinyl alcohol film roll. Is.
• polyvinyl alcohol films have been used for various applications.
• optical films particularly polarizing films, can be mentioned as useful applications.
• a polyvinyl alcohol-based film is commercialized by winding it around a cylindrical core tube after film formation.
• the core tube for winding such a wide and long polyvinyl alcohol film is preferably a core tube made of aluminum from the viewpoint of the weight, strength, cost, etc. of the core tube itself. (For example, refer to Patent Documents 1 and 2).
• the polyvinyl alcohol film roll wound around the core tube is normally stored in a suspended state by supporting the core tube portion protruding outward from the roll end face.
• the core tube may bend or the perfect circle may be deformed due to local force at the part where the tube is supported. From this point, improvement of the core tube for further enlargement is required. It is done. If the core tube is bent or the perfect circle is deformed, the feeding speed becomes unstable due to the eccentricity when the film is fed due to deformation of the core tube, causing problems such as film breakage or shaking. To do. Such a failure also leads to a failure such as optical unevenness. In addition, if the deformation from the perfect circle is too large, it cannot be set even for manufacturing maintenance.
• the present invention is a polyvinyl alcohol film roll corresponding to the widening and lengthening of the polyvinyl alcohol film, and the unrolled film is a homogeneous film having polarization performance and appearance characteristics. It aims at providing the polyvinyl-alcohol-type film roll which can obtain the polarizing film excellent in this.
• the present invention is a polyvinyl alcohol film roll obtained by winding an optical polyvinyl alcohol film on a cylindrical core tube, the core tube is made of an aluminum alloy, and the copper content of the aluminum alloy is 0.00. 15-0.5 wt%, manganese content 0.04-0.8 wt%, chromium content 0.01-0.5 wt%, zinc content 0.01-0.5 wt%
• a certain polyvinyl alcohol film roll is a first gist
• a polarizing film obtained by using a polyvinyl alcohol film obtained by drawing out the polyvinyl alcohol film roll is a second gist.
• the core tube is made of an aluminum alloy
• the copper content of the aluminum alloy is 0.15 to 0.5% by weight
• the manganese content is 0.04 to 0.8% by weight
• the chromium content is 0.01 to 0.5% by weight
• the zinc content is 0.01 to 0.5% by weight. Therefore, even if the core tube is lengthened, it can be excellent in deformation resistance and deflection resistance, and even if the polyvinyl alcohol film wound around the core tube is widened and lengthened, it is resistant to deformation. It can be excellent in resistance and flexibility.
• the polyvinyl alcohol film roll of the present invention can make the fed film homogeneous, and the polarizing film produced from the film can have excellent polarizing performance and appearance characteristics.
• the deformation resistance and deflection resistance of the core tube can be further improved.
• the polyvinyl alcohol film roll The deformation resistance and deflection resistance of the can be further improved.
• the iron content of the aluminum alloy is 0.04 to 0.8% by weight
• the magnesium content is 0.2 to 1.5% by weight
• the titanium content is 0.01 to 0.5% by weight.
• the polyvinyl alcohol film roll of the present invention can make the fed film homogeneous, and the polarizing film produced from the film can have excellent polarizing performance and appearance characteristics.
• the polarizing film of the present invention uses a homogeneous film fed from the polyvinyl alcohol film roll of the present invention, the polarizing film can be excellent in polarizing performance and appearance characteristics.
• One embodiment of the polyvinyl alcohol film roll of the present invention comprises a cylindrical core tube made of an aluminum alloy having a specific component, and a polyvinyl alcohol film wound on the outer peripheral surface of the core tube. Yes.
• the component of the aluminum alloy as the material of the core tube has a copper content of 0.15 to 0.5% by weight, preferably 0.15 to 0.4% by weight, and a manganese content of 0.04 to 0.8%.
• Wt% preferably 0.05 to 0.5 wt%, chromium content 0.01 to 0.5 wt%, preferably 0.04 to 0.35 wt%, zinc content 0.01 to 0
• a combination of 0.5 wt%, preferably 0.04 to 0.25 wt% is preferable.
• the silicon content is 0.3 to 1.5% by weight, preferably 0.4 to 0.9% by weight, so that the deformation resistance and deflection resistance of the core tube are improved. From the viewpoint of further improvement, it is preferable. In addition, since there exists a tendency for the deformation resistance and bending resistance of a core pipe to fall when there is too little content also about this silicon, it is especially preferable that the content exceeds 0.5 weight%.
• the iron content is 0.04 to 0.8% by weight, preferably 0.1 to 0.7% by weight
• the magnesium content is 0.2 to 1.5% by weight, preferably Is a combination of 0.4 to 1.2% by weight and titanium content of 0.01 to 0.5% by weight, preferably 0.04 to 0.15% by weight.
• the core tube used in the present invention is made of an aluminum alloy having the above composition, and the 0.2% proof stress of the aluminum alloy is 175 N / mm 2 or more. It is preferable at the point which can be made excellent.
• a preferable range of the 0.2% proof stress is 175 to 600 N / mm 2 , particularly preferably 200 to 400 N / mm 2 .
• the dimension of the core tube depends on the width of the polyvinyl alcohol film to be wound, etc., but the outer diameter is usually in the range of 150 to 300 mm, preferably in the range of 160 to 260 mm, and the cylinder length ( The axial length) is usually in the range of 2 to 7 m, preferably in the range of 3 to 6 m.
• the wall thickness of the core tube is usually preferably in the range of 3 to 40 mm, particularly preferably in the range of 5 to 30 mm, and more preferably in the range of 6 to 20 mm.
• the mass of the core tube is usually preferably in the range of 15 to 500 kg, particularly preferably in the range of 30 to 150 kg.
• the core tube used in the present invention is an aluminum alloy containing the respective components as described above.
• the core tube can be manufactured as follows. That is, an aluminum alloy ingot containing the above components is usually heated to 400 to 600 ° C. and then extruded from a die in a high-pressure environment to form a cylinder. The aluminum alloy extruded at high temperature is further returned to room temperature and then heated again to 170-180 ° C and held for about 5 to 10 hours for artificial age hardening treatment or rapidly cooled (quenched after high-temperature extrusion) ) May be subjected to artificial age hardening.
• the polyvinyl alcohol film is manufactured as follows, for example. That is, the film is cast using a polyvinyl alcohol resin aqueous solution.
• polyvinyl alcohol resin an unmodified polyvinyl alcohol resin, that is, a resin produced by saponifying polyvinyl acetate obtained by polymerizing vinyl acetate is used. If necessary, a resin obtained by saponifying a copolymer of vinyl acetate and a small amount (for example, 10 mol% or less, preferably 5 mol% or less) of vinyl acetate and a copolymerizable component may be used. it can.
• components copolymerizable with vinyl acetate include unsaturated carboxylic acids (including salts, esters, amides, nitriles, etc.), olefins having 2 to 30 carbon atoms (ethylene, propylene, n-butene, isobutene, etc.) , Vinyl ethers, unsaturated sulfonates and the like.
• a polyvinyl alcohol resin having a 1,2-glycol bond in the side chain can be used as the polyvinyl alcohol resin.
• a polyvinyl alcohol resin having a 1,2-glycol bond in the side chain includes, for example, (i) a method of saponifying a copolymer of vinyl acetate and 3,4-diacetoxy-1-butene, and (ii) acetic acid.
• the weight average molecular weight of the polyvinyl alcohol resin is preferably in the range of 80,000 to 300,000, more preferably 110,000 to 260000, and still more preferably 130,000 to 200,000. If the weight average molecular weight is too small, there is a tendency that sufficient optical performance cannot be obtained when the polyvinyl alcohol resin is used as an optical film, and if too large, stretching becomes difficult when the film is used as a polarizing film, which is industrial. Production tends to be difficult.
• the weight average molecular weight of the polyvinyl alcohol resin is measured by GPC-LALLS method.
• the average saponification degree of the polyvinyl alcohol resin is preferably 80 mol% or more, more preferably 85 to 100 mol%, particularly preferably 98 to 100 mol%.
• the average saponification degree is too small, it tends to be difficult to obtain sufficient polarization performance in the case of a polarizing film.
• the polyvinyl alcohol-based resin aqueous solution preferably contains a commonly used plasticizer such as glycerin, diglycerin, triglycerin, ethylene glycol, triethylene glycol, polyethylene glycol, and trimethylolpropane.
• a commonly used plasticizer such as glycerin, diglycerin, triglycerin, ethylene glycol, triethylene glycol, polyethylene glycol, and trimethylolpropane.
• the content is preferably 30% by weight or less, particularly 3 to 25% by weight, more preferably 5 to 20% by weight, based on the polyvinyl alcohol resin. If the amount of the plasticizer is too large, the film strength tends to decrease.
• a nonionic, anionic or cationic surfactant particularly preferably a nonionic surfactant such as polyoxyethylene alkylamino ether.
• the content of the surfactant is preferably 5% by weight or less, more preferably 0.001 to 3% by weight, and particularly preferably 0.001 to 2% by weight with respect to the polyvinyl alcohol resin.
• sodium acetate contained in the polyvinyl alcohol-based resin powder is removed (devinegared) because it adversely affects optical performance.
• This removal of sodium acetate (devinegaring) is usually performed by adding water to the polyvinyl alcohol resin in a devinegaring tank.
• the water-containing polyvinyl alcohol resin wet cake after washing is dissolved to prepare a polyvinyl alcohol resin aqueous solution.
• a desired high-concentration aqueous solution is obtained. Therefore, it is preferable to perform dehydration once.
• the dehydration method is not particularly limited, but a method using centrifugal force is common.
• a water-containing polyvinyl alcohol resin wet cake having a water content of 50% by weight or less, preferably 30 to 45% by weight, is preferably formed. If the water content is too high, it tends to be difficult to obtain a desired aqueous solution concentration.
• a dissolving can water vapor (about 110 to 160 ° C.) is blown into the cake-like polyvinyl alcohol resin to dissolve it under pressure to prepare a polyvinyl alcohol resin aqueous solution.
• a plasticizer, an additive, etc. are added as needed.
• an aqueous polyvinyl alcohol resin solution having a water content of about 60 to 80% by weight is obtained.
• the obtained polyvinyl alcohol resin aqueous solution is filtered to remove impurities, and then defoamed.
• a defoaming treatment method a stationary defoaming method or a defoaming treatment method using a multi-screw extruder is used, and a defoaming treatment method using a multi-screw extruder is preferred.
• the polyvinyl alcohol-based resin aqueous solution that has been pushed out from the T-type slit die and flowed down is cast, formed, and dried on the outer peripheral surface of the rotating drum-type roll to form a film. Further, for the film formation and drying, the drum-type roll itself is usually at a high temperature (about 80 to 100 ° C.).
• the water content of the film is preferably 5% by weight or less, particularly preferably 1 to 4% by weight. When the water content is too high, appearance defects tend to be caused during storage of the film. In this way, the desired polyvinyl alcohol film is obtained.
• the dimensions of the obtained polyvinyl alcohol film are usually set in the range of 1.5 to 6 m in width and in the range of 5000 to 20000 m in length.
• the core pipe made from an aluminum alloy which has the said specific component is set to a winder.
• the winding machine is driven to rotate the core tube, and the obtained polyvinyl alcohol film is wound around the outer peripheral surface of the core tube.
• the core tube is made of an aluminum alloy having a specific component and has a high strength by being made of an aluminum alloy having a 0.2% proof stress of 175 N / mm 2 or more. Since it has excellent deformation resistance and deflection resistance, when the core tube is rotated by the winder, the rotational deflection of the core tube is small, and the polyvinyl alcohol film is Can be wound in a homogeneous state.
• the wound polyvinyl alcohol film is cut into a product width by a slitter, and is wound around the core tube again.
• the core tube is also preferably used as the core tube of the polyvinyl alcohol film roll when stored and transported as a product, and has a step of rewinding after the slitter. In the winding before that, if the core tube has a small rotational runout, high strength, excellent deformation resistance and deflection resistance, it is not necessary to be the core tube.
• Different aluminum core tubes, iron core tubes, and the like can be used as appropriate.
• the winding speed of the core tube is set to 30 to 100 m / min, preferably 40 to 80 m / min, or the rotation adjustment method is set to a constant tension. It is preferable to use a control method or to set the rotational torque to 20 to 200 N / m.
• the polyvinyl alcohol film roll obtained in this way is moved to a support base and the left and right ends of the core tube are supported. Since the core tube is excellent in deformation resistance and deflection resistance as described above, the polyvinyl alcohol film roll obtained by winding the polyvinyl alcohol film on the core tube is also resistant to deformation and deflection. It is excellent in performance and is supported, stored or transported without deformation or deflection, or with a small amount of deformation or deflection.
• the polyvinyl alcohol-type film of the said polyvinyl alcohol-type film roll is very useful as a formation material of an optical film, especially a polarizing film. Therefore, an example of a method for producing a polarizing film using the polyvinyl alcohol film will be described below.
• the polyvinyl alcohol film roll is set on the polarizing film manufacturing apparatus from the support. And a polyvinyl alcohol-type film is drawn out from the polyvinyl alcohol-type film roll.
• a polyvinyl alcohol-type film is drawn out from the polyvinyl alcohol-type film roll.
• the dyeing is performed by bringing the polyvinyl alcohol film into contact with a liquid containing iodine or a dichroic dye.
• a liquid containing iodine or a dichroic dye usually, an aqueous solution of iodine-potassium iodide is used.
• the concentration of iodine is 0.1 to 20 g / liter, the concentration of potassium iodide is 10 to 70 g / liter, and the mixing weight ratio of potassium iodide / iodine is iodine.
• a range of potassium fluoride / iodine 10 to 100 is preferable.
• the dyeing time is practically 30 to 500 seconds, and the dyeing bath temperature is preferably 5 to 60 ° C.
• a small amount of an organic solvent compatible with water may be contained.
• any means such as dipping, coating, spraying and the like can be applied.
• the uniaxial stretching is preferably 3 to 10 times, more preferably 3.5 to 6 times.
• the film may be slightly stretched in the direction perpendicular to the uniaxial stretching (stretching to prevent shrinkage in the width direction or more).
• the temperature condition during uniaxial stretching is preferably set in the range of 40 to 170 ° C.
• the uniaxial stretching ratio may be finally set within the above range, and the uniaxial stretching operation may be performed not only in one stage but also in any stage of the manufacturing process.
• the dyeing may be performed before uniaxial stretching, simultaneously with uniaxial stretching, or after uniaxial stretching, but the polyvinyl alcohol film is dyeable as crystallization proceeds by uniaxial stretching.
• the dyeing is preferably performed before or simultaneously with uniaxial stretching.
• the boron compound treatment is a treatment for strengthening the dyeing, and is performed after the dyeing and the uniaxial stretching, simultaneously with the dyeing, or simultaneously with the uniaxial stretching.
• the boron compound boric acid and borax are practical.
• This boron compound is used as an aqueous solution or a water-organic solvent mixed solution at a concentration of about 0.3 to 2 mol / liter, and it is practically preferable to allow a small amount of potassium iodide to coexist in the solution.
• a treatment method using the boron compound an immersion method is preferable, but a coating method and a spraying method can also be performed.
• treatment conditions a temperature of about 40 to 70 ° C. and a treatment time of about 2 to 20 minutes are preferable, and it is also preferable to perform a stretching operation during the treatment as necessary.
• the polyvinyl alcohol film that is the material of the polarizing film is drawn out from the polyvinyl alcohol film roll in a homogeneous state without wrinkles or folds. Therefore, it has excellent polarization performance and appearance characteristics.
• the polarizing film can also be used as a polarizing plate by laminating and bonding an optically isotropic polymer film or sheet as a protective film on one or both surfaces thereof.
• the protective film include cellulose triacetate, cellulose diacetate, polycarbonate, polymethyl methacrylate, polystyrene, polyethersulfone, polyarylene ester, poly-4-methylpentene, polyphenylene oxide, cyclo- or norbornene-based polyolefin, and the like. Examples include films or sheets.
• the polarizing film may be laminated by applying a curable resin such as urethane resin, acrylic resin, urea resin, etc. on one or both sides of the polarizing film instead of the protective film. .
• the polarizing film (or a protective film or a curable resin laminated on at least one surface thereof) is practically used by forming a transparent pressure-sensitive adhesive layer on the one surface as required. In some cases, it is served.
• the pressure-sensitive adhesive layer include acrylic acid esters such as butyl acrylate, ethyl acrylate, methyl acrylate, 2-ethylhexyl acrylate, acrylic acid, maleic acid, itaconic acid, methacrylic acid, and crotonic acid.
• Copolymers of these with ⁇ -monoolefin carboxylic acids may interfere with the polarization performance of the polarizing film.
• any pressure-sensitive adhesive having transparency can be used.
• polyvinyl ether, rubber, and the like can be used.
• the polarizing film thus obtained can be used, for example, for liquid crystal displays (electronic desk calculators, electronic clocks, word processors, personal computers, personal digital assistants, liquid crystal display devices such as automobiles and machinery instruments), sunglasses, It is used for dazzling glasses, stereoscopic glasses, reflection reduction layers for display elements (CRT, LCD, etc.), medical equipment, building materials, toys and the like.
• liquid crystal displays electronic desk calculators, electronic clocks, word processors, personal computers, personal digital assistants, liquid crystal display devices such as automobiles and machinery instruments
• sunglasses It is used for dazzling glasses, stereoscopic glasses, reflection reduction layers for display elements (CRT, LCD, etc.), medical equipment, building materials, toys and the like.
• Example 1 As shown below, after producing a core tube and a polyvinyl alcohol film, the polyvinyl alcohol film was wound around the outer peripheral surface of the core tube to produce a polyvinyl alcohol film roll. And the polarizing film was produced using the polyvinyl alcohol-type film of the polyvinyl alcohol-type film roll.
• A6N01 defined by JIS was selected, and a cylindrical core tube was produced using it as a material.
• the chemical composition of the aluminum alloy A6N01 is shown in Table 1 below, and the 0.2% proof stress is shown in Table 2 below.
• the dimensions of the core tube were an outer diameter of 215 mm, a cylindrical length of 3500 mm, and a wall thickness of 6 mm.
• the mass of the core tube was 37 kg.
• the 0.2% yield strength was determined as follows. That is, the measurement of 0.2% proof stress was based on JIS Z2241 “Metal material tensile test method”. In addition, the test piece was produced in accordance with JIS Z2201 “Metal material tensile test piece” and cut from a cylindrical core tube into test piece classification No. 14B. The tensile test was performed using an autograph AG-X (100 kN) manufactured by Shimadzu Corporation at a tensile speed of 5 mm / min. Based on the measurement data, the stress when 0.2% strain was applied from the strain-stress curve was defined as 0.2% proof stress.
• Polyvinyl alcohol film 100% polyvinyl alcohol having a weight average molecular weight of 135,000 and a saponification degree of 99.7 mol%, 12 parts of glycerin as a plasticizer, and 0.1 part of polyoxyethylene alkylamino ether as a surfactant (release agent), 35%
• a polyvinyl alcohol aqueous solution having a concentration (including a plasticizer and a release agent as a solid content)
• the film is casted with a drum-type roll from a T-type slit die, dried, heat-treated and conditioned to a moisture content of 4%.
• a polyvinyl alcohol film having a width of 3000 mm and a thickness of 75 ⁇ m was produced.
• Example 2 In the said Example 1, the thickness of the core pipe was 8 mm. The mass of the core tube was 50 kg. Other than that was the same as Example 1 above.
• Example 3 As an aluminum alloy having a specific component and 0.2% proof stress as in the above embodiment, A6061 defined by JIS was selected, and a cylindrical core tube was produced using it as a material. The 0.2% proof stress was obtained in the same manner as in Example 1 above.
• the chemical components of the aluminum alloy A6061 are shown in Table 1 below, and the 0.2% proof stress is shown in Table 2 below.
• the dimensions of the core tube were an outer diameter of 233 mm, a cylinder length of 4800 mm, and a wall thickness of 15 mm.
• the mass of the core tube was 133 kg.
• a polyvinyl alcohol film having a width of 4500 mm and a thickness of 60 ⁇ m was prepared as a polyvinyl alcohol film wound around the core tube. Moreover, the mass of the polyvinyl alcohol film roll was 3600 kg. Other than that was the same as Example 1 above.
• Example 1 the core pipe made from aluminum alloy A6063 prescribed
• the chemical composition of the aluminum alloy A6063 is shown in Table 1 below, and the 0.2% proof stress is shown in Table 2 below.
• the 0.2% proof stress was obtained in the same manner as in Example 1 above.
• the mass of the core tube was 37 kg.
• the mass of the polyvinyl alcohol film roll was 3000 kg. Other than that was the same as Example 1 above.
• Example 2 In the said Example 3, the core pipe made from aluminum alloy A6063 prescribed
• Test piece made of an aluminum alloy constituting the core tube of Examples 1 and 2 and Comparative Example 1 width 40 mm, thickness is the thickness of each example (Example 1 and Comparative Example 1: 6 mm, Example 2: 8 mm)
• Each of the test pieces was subjected to a compression test under the following conditions using a tensile and compression tester (Instron, 100KN). And the load at the time of displacement 50mm was measured, and the average value of three test pieces was computed. Bending speed: 10 mm / min Test temperature: 23 ° C Load cell used: 100kN Compression distance: 80mm
• the average value of the load at the displacement of 50 mm was 3873N for the test piece of Example 1, 6357N for the test piece of Example 2, and 1797N for the test piece of Comparative Example 1. That is, the compressive strength at the displacement of 50 mm is about 2.2 times that of the test piece of Example 1 and about 3.5 times that of the test piece of Example 2 with respect to the test piece of Comparative Example 1. .
• the present invention can be used when a polarizing film having excellent polarization performance and appearance characteristics can be obtained from the film even when the polyvinyl alcohol film is widened or elongated.

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• Mechanical Engineering (AREA)
• General Physics & Mathematics (AREA)
• Optics & Photonics (AREA)
• Polarising Elements (AREA)
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• Manufacture Of Macromolecular Shaped Articles (AREA)

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• 2014
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