Coating processes – Direct application of electrical – magnetic – wave – or... – Electrostatic charge – field – or force utilized
Patent
1991-08-09
1994-08-23
Owens, Terry J.
Coating processes
Direct application of electrical, magnetic, wave, or...
Electrostatic charge, field, or force utilized
427535, 427129, 427420, 118DIG4, B05D 314
Patent
active
053406168
ABSTRACT:
Methods for coating various liquid coating solutions onto continuously running support webs for use in the manufacture of photographic film materials, photographic printing paper, magnetic recording materials such as magnetic recording tape, adhesive tape, information recording paper such as pressure-sensitive paper or thermal paper, and materials for use in photomechanical processes, wherein uniform coating characteristics are obtained, both at the start of coating operations and at the passage of various seams in the web. In a preferred embodiment of the invention, an electric field of a strength in a range of 100-1000 volts/cm as measured with a surface potentiometer is applied on the surface of the web to be coated and, at the same time, air having a relative humidity of 70-85% is blown against the surface of the web after the start of coating operation but just prior to a time when the thin film of coating solution impinges against the web.
REFERENCES:
patent: 3508947 (1970-04-01), Hughes
patent: 3632374 (1972-01-01), Greiller
patent: 4457256 (1984-07-01), Kisler
patent: 4835004 (1989-05-01), Kawanishi
patent: 5114759 (1992-05-01), Finnicum et al.
Kistler et al, "Finite Element Analysis of Dynamic Wetting for Curtain Coating at High Capillary Numbers", American Institute of Chemical Engineers 1982 Winter Meeting (Feb. 28-Mar. 3).
Amano Masayuki
Kusuoka Makoto
Bareford Katherine A.
Fuji Photo Film., Ltd.
Owens Terry J.
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