| 摘要 |
PURPOSE:To obtain resin film, in which the generation of scraped-off particle and the thickness unevenness are few, by a method wherein resin film is obtained by cooling molten resin arranged on a casting drum and both the edges of the film are shaped flat. CONSTITUTION:Molten resin 15 in a nozzle 11 flows down continuously from a nozzle lip 11A onto the top face of a casting drum 12 and is moved below spot coolers 13 and 13 through the rotation of the casting drum 12. Both the edges of the molten resin 15 are fixed with the spot coolers 13 and 13 so as to make the width of the resin nearly constant through the fixation of the positions of both end parts of the resin. The molten resin 15 is brought into close contact with the casting drum 12 by means of air jetted from an air knife 14 and cooled in order to obtain resin film 15A. Both the edges of the resin film 15A are pressed and shaped flat with nip rolls 16. Further, the scanning of both its edges is improved, resulting in decreasing the generation of scraping-off particle and the staining and thickness ununiformity of the resin film 15A are improved. |
