Optical compensatory sheet producing method and apparatus, thermal treating method and apparatus, and dust removing method and apparatus
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[0272] Comparative Example 6 (Prior Art)
[0273] In FIG. 16, a web supply device 201 supplied polyethylene terephthalate film at a speed of 50 m / min. The film was 100 μm thick and 100 cm wide. A coater head 202 coated the film with coating solution including particles of latex of which average diameters were 3 μm and 10 μm. A drier zone 203 evaporated the coating solution to obtain film in which an amount of deposited foreign matter was controlled. Composition of the coating solution including the latex was as follows:
3 μm latex stock solution0.1 ml10 μm latex stock solution3.0 mlMethanol46.9 ml Pure water50.0 ml
[0274] The latex stock solution includes monodisperse polystyrene latex at 1 wt. %. The resin film 210 was coated with the solution at 25 ml / m2. A surface of the resin film 210 was dried, and then checked visually through a microscope. It was observed that latex particles of 3 μm and 10 μm were regularly deposited on the surface at a density of approximately 1,000 particle...
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