Water-Soluble Film Roll and Method for Paying Out Water-Soluble Film
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example 1
[0042]As shown in FIG. 1, to each of both end faces 4 of a water-soluble film roll 3 prepared by winding up a polyvinyl alcohol film (VF-H Series manufactured by Kuraray Co., Ltd., thickness: 30 μm, width: 300 mm, length: 1000 m, water content: 2.8%, Young's modulus: 200 MPa), which is a water-soluble film 1, around a paper tube 2 (paper cylinder with an inner diameter of 75 mm and an outer diameter of 90 mm), a “protect tape #6314-B” (polyolefin film having a special synthetic rubber-based pressure-sensitive adhesive layer on one side; overall thickness: 60 μm, adhesion: 0.9 N / cm) manufactured by Sekisui Chemical Co., Ltd., which had been cut into a doughnut shape in conformity with the outer diameter of the paper tube 2 and the winding diameter of the water-soluble film roll 3, as a masking material 5, was adhered with avoidance of air bubble formation. In a room humidification-conditioned to a temperature of 20° C. and a relative humidity of 60% from the outdoor conditions, i.e. ...
example 2
[0043]Operations the same as those in Example 1 were repeated except using as masking materials 5, “protect tape #622-B” (polyolefin film having an ethylene vinyl acetate (EVA)-based pressure-sensitive adhesive layer on one side; overall thickness: 55 μm adhesion: 0.02 N / cm) manufactured by Sekisui Chemical Co. Ltd. which had been cut into a doughnut shape in conformity with the outer diameter of the paper tube 2 and the winding diameter of the water-soluble film roll 3. In this operation, the generation of peeling sound of the polyvinyl alcohol film at the end portions of the water-soluble film roll 3 was checked and the number of ruptures of the polyvinyl alcohol film was counted. When this evaluation procedure was repeated for five rolls, no peeling sound and no rupture were generated in three rolls. In two rolls, however, the polyvinyl alcohol films peeled off partly from the end faces 4 of the rolls and came to produce peeling sound during the paying out of the films. In additi...
example 3
[0044]Operations the same as those in Example 1 were repeated except using, as masking materials 5, “Elep masking tape N-300” (polyester film having an acryl-based pressure-sensitive adhesive layer on one side; overall thickness: 100 μm, adhesion: 2.8 N / cm) manufactured by Nitto Denko Corp. in this operation, the generation of peeling sound of the polyvinyl alcohol film at the end portions of the water-soluble film roll 3 was checked and the number of ruptures of the polyvinyl alcohol film was counted. The results of evaluations for only one roll are summarized in Table 1
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Abstract
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