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Package, method for storing or transporting polyvinyl alcohol film, polyvinyl alcohol film, and polarizing film

A technology of polyvinyl alcohol series and packaging body, which is applied in the direction of packaging, transportation and packaging, special packaging objects, etc., can solve the problems of uneven polarization degree of polarizing film, film deformation, uneven color, etc. Offset, productivity improvement effect

Pending Publication Date: 2021-03-09
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because if the moisture content of the polyvinyl alcohol-based film fluctuates greatly during storage or transportation, or if the moisture content in the film surface becomes uneven, not only the film will be deformed but also the optical properties in the film surface will change, and the resulting polarizing film will be polarized. Degree unevenness (in-plane unevenness of polarization degree), color unevenness

Method used

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  • Package, method for storing or transporting polyvinyl alcohol film, polyvinyl alcohol film, and polarizing film
  • Package, method for storing or transporting polyvinyl alcohol film, polyvinyl alcohol film, and polarizing film
  • Package, method for storing or transporting polyvinyl alcohol film, polyvinyl alcohol film, and polarizing film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0175] (manufacturing of film rolls)

[0176] Add 1000kg of polyvinyl alcohol-based resin with a weight average molecular weight of 142000 and a saponification degree of 99.8 mol%, 2500kg of water, and 100kg of glycerin as a plasticizer, and heat up to 140°C while stirring, and adjust the concentration to a resin concentration of 25% by weight to obtain a uniform Dissolved polyvinyl alcohol-based resin aqueous solution.

[0177] Next, after supplying the aqueous solution of polyvinyl alcohol-based resin to a twin-screw extruder for defoaming, the temperature of the aqueous solution was set at 95°C, and it was sprayed and cast on a pouring drum with a surface temperature of 90°C from a T-shaped slot die outlet. to film.

[0178] Next, the obtained film was dried with a plurality of metal heating rolls, heat-treated using a suspension dryer, and cut to a width of 4 m by a cutter. Finally, it was wound up on an aluminum core pipe with an outer diameter of 17 cm, an inner diamet...

Embodiment 2

[0188] As the water vapor barrier film, a laminate with a hygroscopic film (NS-APP manufactured by Nissin Seal Industry Co, Ltd.) was used, and the humidity-conditioning sheet was not used, and the packaging was carried out in the same manner as in Example 1. production, storage, and production of polarizing films. The results are shown in Table 1 and Table 2.

Embodiment 3

[0190] As a water vapor barrier film, a laminated film of aluminum-deposited polyester film (polyethylene terephthalate film, 12 μm thick) and polyethylene film (25 μm thick) was prepared, and the packaging A humidity indicator (manufactured by Fujita Electric Manufacturing Co., Ltd., "WATCHLOGGER KT-275") was pasted on the polyethylene side of the inner surface.

[0191] Next, in an environment of 23° C. and 50% RH, two layers of the above-mentioned water vapor barrier film were wound on the film roll of Example 1 with the polyethylene film inside. The axial end of the core tube in the water vapor barrier film was fixed to the outer periphery of the end of the core tube protrusion (0.2 m at both ends) with a rubber band, and the remaining part of the water vapor barrier film was wrapped around the core tube. The way the ends fold into the inside of the core tube. It should be noted that the length of the water vapor barrier film portion folded in from one end of the core tub...

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Abstract

Provided is a package of a polyvinyl alcohol-based film capable of suppressing deformation and optical performance degradation even during storage and transportation. The package (11) is characterizedby winding a strip-shaped polyvinyl alcohol film on a core tube (2) to form a film roll (3), respectively attaching protective pads (7) to the both ends of the film roll (3), and then packaging the film roll (3) together with the protective pads (7) with a water vapor barrier film (4). Since the humidifying sheet (8) is adhered to the side of the protective pad (7) that is in contact with the film roll (3), the film roll (3) and the protective pad (7) to which the humidifying sheet (8) is adhered are packaged together by the water vapor barrier film (4). By packaging the humidifying sheet (8)together with the film roll (3), the humidity of the internal space in which the film roll (3) is arranged is humidified to 20-80% RH.

Description

[0001] The application date is September 1, 2016 (the earliest priority date is September 4, 2015), the application number is 201680064371.3, and the title of the invention is "Package body, storage or transportation method of polyvinyl alcohol film, poly Vinyl alcohol-based film, and polarizing film" is a divisional application of the application. technical field [0002] The present invention relates to a package, a storage or transportation method of a polyvinyl alcohol-based film, a polyvinyl alcohol-based film, and a polarizing film. More specifically, the present invention relates to a package suitable for storage and transportation of a polyvinyl alcohol-based film that is excellent in appearance, has no optical unevenness, and is useful as a raw material for obtaining a polarizing film, and a polyvinyl alcohol using the same A storage or transportation method of the polyvinyl alcohol-based film, a polyvinyl alcohol-based film thus stored and / or transported, and a polar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B65D81/22B65D81/05B65D85/672B65D25/00B65H75/04B65H75/18G02B5/30
CPCB65D81/22B65D81/05B65D85/672B65D25/00B65H75/04B65H75/18G02B5/30B65D81/24
Inventor 清水俊宏早川诚一郎久保田哲哉
Owner MITSUBISHI CHEM CORP
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