Dual surface film coating of running web
AssigneeFuji Photo Film Co., Ltd.
InventorsTetsuo Yoshida, Motohiro Ujihara, Takeshi Watanabe, Akira Takagi
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Abstract
A first coating liquid 3 is applied to one surface of a continuously running web 1 and fluidity of the first coating layer is eliminated by an air blower 6, after which the web is float supported over a cylindrical blower 7 by static gas pressure. A second coating liquid 11 is applied to the opposite surface of the web in the vicinity of the float region by a freely falling curtain film 12 or by a pressure extruded jet film 15. sp This is a continuation of application Ser. No. 887,400, filed Mar. 16, 1978, now abandoned.
Claims7
A method of applying a uniform coating to one surface of a continuously running support web to whose opposite surface at least one unsolidified layer of a first coating liquid has been applied, comprising the steps of:
- (a) eliminating a fluidity of the first coating layer,
- (b) applying a static gas pressure to the opposite surface of the web to support it,
- (c) creating a thin jet film of a second coating liquid by pressure extrusion through a narrow elongated slit disposed a predetermined distance from and transverse to the running direction of said web, and
- (d) causing the thin film to impinge against said one surface of the web in the region of its static pressure support at a velocity in the range of 0.5 to 3.0 meters/second to thereby minimize coating thickness variations along said running direction of said web.
Dependencies are inferred from the claim text.