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Problems solved by technology
Said foreign matter may cause scratches on the polymer film
Therefore, in the methods described in Japanese Patent Laid-Open Publications 6-179556 and 2005-306019, scratches caused by adhesion of foreign matter cannot be prevented from occurring on the polymer film
Method used
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Examples
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Embodiment 1
[0093] The roller body 48a of each driving roller 48 is made of stainless steel (no plating), and has a diameter of 300 mm and a longitudinal length of 1000 mm. Shafts 48b are respectively fixedly mounted to the centers of opposite ends of the roller body 48a to define the center of rotation of the roller body 48a. Bearings are attached to each shaft 48b so as to be symmetrical to each other with respect to the roller body 48a. The distance between the center of one bearing and the center of the other bearing is 1500mm. The troughs 60 and the crests 61 are formed on the roller body 48a such that the pitch P v and P m 0.5mm, height H v-m is 0.04mm, and the radius of curvature R v and R m 0.4mm.
[0094] Coating 11 having the following composition was prepared.
[0095] Triacetylcellulose (degree of acetylation: 60.7%) 100 parts by weight
[0096] Plasticizer A (triphenyl phosphate (TPP)) 8 parts by weight
[0097] Plasticizer B (biphenyl diphenyl phosphate (BDP)) 4 par...
Embodiment 2
[0110] Experiments 1 to 5 were carried out under the same conditions as in Example 1, except that the temperature of the film 12 in the second drying chamber 21 was adjusted to 100° C., and as shown in Table 2, in Experiments 1 to 5, The tension difference between the pulling tension on the downstream side and the pulling tension on the upstream side is changed in each. The evaluation method is the same as that of Example 1. The results are shown in Table 2.
[0111] Comparative Experiments 1 to 5 were carried out in the second drying chamber 21 using the suction roll 2 instead of the drive roll 48 in Experiments 1 to 5 . Other conditions were the same as those of Experiments 1 to 5. The results are shown in Table 2.
[0112] [Table 2]
[0113]
Embodiment 3
[0115] Experiments 1 to 4 were carried out under the same conditions as in Example 1, except that the temperature of the film 12 in the second drying chamber 21 was adjusted to 100° C., and as shown in Table 3, in Experiments 1 to 4 The conveying speed of the film 12 is changed in each. The evaluation method is the same as that of Example 1. The results are shown in Table 3.
[0116] Comparative Experiments 1 to 4 were performed in the second drying chamber 21 using the suction roll 2 instead of the driving roll 48 in Experiments 1 to 4 . Other conditions were the same as those of Experiments 1 to 4. The results are shown in Table 3.
[0117] [table 3]
[0118]
[0119] In Experiments 1 to 6 of Example 1, Experiments 1 to 5 of Example 2, and Experiments 1 to 4 of Example 3, the film 12 did not slip relative to the driving roller. It should be noted that referring to the results of Experiments 4 to 6 and Comparative Experiments 4 to 6 in Example 1, it was confirmed that...
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Abstract
The present invention provides a film producing method. A solution casting apparatus includes a drive roller as a conveying means. The drive roller conveys a polymer film peeled from a belt, the polymer film still containing a solvent. The drive roller has corrugation valleys and corrugation peaks formed on a peripheral surface along a circumferential direction of the drive roller. Each of the corrugation valleys and the corrugation peaks has a substantially semicircular cross section. The corrugation valleys and the corrugation peaks are disposed alternately in an axial direction of the drive roller. A pitch Pv between the corrugation valleys and a pitch Pm between the corrugation peaks are in the range of 0. 01 to 2 mm, and a height Hv-m from a lowest point of the corrugation valley to a highest point of the corrugation peak is in the range of 0. 01 to 1 mm. A curvature radius Rv of the corrugation valley and a curvature radius Rm of the corrugation peak are in the range of 0. 1 to 0. 5 mm.
Description
technical field [0001] The present invention relates to a film production method that produces a polymer film by melting and extruding a polymer, or by casting and drying a polymer solution. Background technique [0002] As a method for producing a polymer film, that is, a film production method, there are a melt extrusion method and a solution casting method. In the melt extrusion process, polymer in pellet or powder form is heated to melt it. The molten polymer is extruded to form a thin film as a polymer film. The polymer film is cooled while being transported. In the solution casting method, a dope obtained by dissolving a polymer in a solvent is cast onto a casting support so that it becomes a casting film. The cast film is peeled off from the cast support before the solvent is completely evaporated from the cast film. The polymer film is dried while being transported. As described above, in both film production methods, a polymer film is subjected to a predetermin...
Claims
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