Title: Curtain coating apparatus

Abstract: An apparatus for curtain coating is provided wherein a falling curtain of coating liquid is formed by causing coating liquid to flow as a layer down an inclined surface of a slide hopper, the inclined surface terminating in a lip and the coating liquid beginning its fall after flowing over the lip on to a travelling web positioned beneath the slide hopper and being coated thereon as a layer. The slide hopper is provided with two vertical edge guiding plates extending parallel to the direction of web motion and being of such width to allow the curtain edge to follow its natural inflected path. Preferably the edge guiding plates are composed of an easily wettable material, particularly polymethymethacrylate.

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Inventors: Ridley, Kenneth A. (Brentwood, GB)

Application Number: 772335
Filing Date: 1977-02-25
Publication_date: 1979-01-23
Assignee: Ciba-Geigy AG (Basel, CH)
Primary Class(es): 118/325 118/DIG4, 427/420
Other Classes:
US Patent Ref:

3365325	Jan, 1968	Fraenkel et al.	118/DIG.
3508947	Apr, 1970	Hughes	118/DIG.
3632403	Jan, 1972	Greiller	118/DIG.
3717121	Feb, 1973	Bruckbauer et al.	118/324.
3867901	Feb, 1975	Greiller	118/325.
4019906	Apr, 1977	Ridley	118/325.

Other Refs: 24484401429260272844

Apr, 1975	DE
Mar, 1976	GB
Mar, 1970	SU

Primary Examiner: Rimrodt, Louis
Assistant Examiner:
Attorney: