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Film roll

A film roll and polyvinyl alcohol film technology, applied in the field of film rolls, can solve the problems of easy condensation, condensation on the inner wall of a cylindrical core, and easy condensation.

Inactive Publication Date: 2017-02-22
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when the film roll is transported from an unair-conditioned storage place to an air-conditioned processing place in a cold region in winter, dew may condense on the inner wall of the cylindrical core.
In particular, recently, the weight of the film roll has gradually increased as mentioned above. Therefore, due to the increase in the heat capacity of the film roll and the accompanying decrease in the temperature change rate of the entire film roll, dew condensation has become more likely to occur.
In addition, as mentioned above, as the weight of the film roll increases, metal cores and carbon fiber reinforced plastic cores are gradually used, but metal and plastic cores are more prone to dew condensation than paper cores, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] A PVA film with a film width of 3.3m, a thickness of 60μm, and a length of 12,500m (the degree of polymerization of PVA is 2,450, and the degree of saponification of PVA is 99.3 mol%) is wound on aluminum with a length of 3.5m, an outer diameter of 215mm, and a wall thickness of 6mm. The central part of the cylindrical core. Thereafter, two sheets of non-woven fabrics made of cellulose-based synthetic fibers ("Dasto Tacqueru" wiper, manufactured by KURARAY CO., LTD., 33 cm in length x 33 cm in width) were prepared. figure 1 As shown in the schematic diagram of , fix them to the inner wall lower parts of both ends of the core with adhesive tapes. In addition, the fixed position of the nonwoven fabric was set as the position deviated from each end by 20 cm in the axial direction (the shortest distance from the edge part of a core to a water-absorbent member was 20 cm). In addition, as the adhesive tape, a polyethylene tape was used. The mass of the film roll obtained in...

Embodiment 2

[0080] In order to replace the sheet-like nonwoven fabric made of cellulose-based synthetic fibers with 4 layers, a sheet-like cellulose-based natural fiber (wool, 30 cm in length x 30 cm in width) was used. Except that, it carried out similarly to Example 1, and obtained the film roll. About this film roll, it carried out similarly to Example 1, and performed each evaluation. The results are shown in Table 1.

Embodiment 3

[0082] Except having changed the length of the PVA film into 1,000 m from 12,500 m, it carried out similarly to Example 1, and obtained the film roll. It should be noted that the mass of the film roll is 300 kg. About this film roll, it carried out similarly to Example 1, and performed each evaluation. The results are shown in Table 1.

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Abstract

A film roll obtained by film (not shown) being wrapped on a cylindrical core (1), wherein the film roll has a water-absorbing member (3) on the inner wall (2) of a core (1). The film roll preferably has the water-absorbing member (3) on the inner wall (2) of both end parts (5) of the core (1), and preferably has the water-absorbing member (3) on the lower part of the inner wall (2) of the core (1); the distance from an end (4) of the core (1) to the water-absorbing member (3) is preferably 10 cm or more; and the water-absorbing member (3) preferably includes at least one type of fiber selected from the group consisting of cellulose synthetic fibers and polyester fibers.

Description

technical field [0001] The present invention relates to a film roll obtained by winding a film around a cylindrical core. Background technique [0002] Plastic films such as polyvinyl alcohol (hereinafter, "polyvinyl alcohol" may be abbreviated as "PVA") film used as a raw material for polarizing films are usually stored or transported in the form of a film roll wound around a cylindrical core. . Recently, as for the PVA film used as the raw material of the polarizing film for liquid crystal displays, a wider PVA film is required as the size of the liquid crystal display increases, and winding is also required in order to improve the processability and productivity of the polarizing film. Longer length PVA film. As such PVA films become wider and longer, the weight of the film roll will increase. Therefore, when loading, unloading, and moving the film roll onto the frame or processing equipment, it is often operated by inserting a support rod into the core. . Therefore, ...

Claims

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Application Information

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IPC IPC(8): B65H75/10
CPCB65H75/10B65H2701/5122B65H2701/5124B65H2701/5114B65H2701/5112B65H2701/52B65H2701/175
Inventor 樋口雄太宫本弘树
Owner KURARAY CO LTD