Slide hopper-type method for coating moving web having reduced s

Details Slide hopper-type method for coating moving web having reduced s Slide hopper-type method for coating moving web having reduced s

1992-05-28

1995-08-08

Beck, Shrive

Coating processes

Vacuum utilized prior to or during coating

427420, 118410, B05D 300

Patent

active

054397081

ABSTRACT:
A solution applying method in which a continuously conveyed web is applied with a coating solution by a solution injector. The solution injector includes a lip with a lower end portion thereof having an angle of 85.degree. or less relative to a surface of the injector. A coating solution flows along the lip of the solution injector to form a bead between the lip and the web. The solution applying conditions and pressures before and after the bead is formed between the web and the lip are controlled before the coating solution is applied to the web such that a lower end portion of the bead coincides with the lower end portion of the lip. The solution applying device may have a lower end portion of the lip with an angle of not more than 89.degree.. A portion of the lip may extend parallel to a roller conveying the web and has a length of 0.1-10 mm. Even when a solution having good wettability is used as a coating solution, foreign matter is prevented from adhering to the lip due to drying, hardening and gelation of the coating solution to thereby prevent streaking for a relatively long duration.

REFERENCES:
patent: 2681294 (1954-06-01), Beguin
patent: 3849166 (1974-11-01), Omichi et al.
patent: 3928679 (1975-12-01), Jackson et al.
patent: 3993019 (1976-11-01), Jackson
patent: 4292349 (1981-09-01), Ishiwata et al.
patent: 5332440 (1994-07-01), Hirshburg
patent: 5380369 (1995-01-01), Hirshburg

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