Method of simultaneously applying multiple layers to web

Details Method of simultaneously applying multiple layers to web Method of simultaneously applying multiple layers to web

1982-10-18

1985-06-25

Silverberg, Sam

Coating processes

Falling curtain of coating material utilized

118410, 118411, 427411, 427294, 430935, B05D 130

Patent

active

045253927

ABSTRACT:
A method of simultaneously applying multiple layers of coating liquids to a moving web with a slide hopper type coating apparatus in which the fluidity of a coating liquid for forming the lowermost of multiple layers is improved to thereby eliminate inter-layer mixing and waving. The first coating liquid which forms the lowermost of the multiple layers is prepared so that it, when run at a low shear rate, has a viscosity equal to or different by no more than .+-.10 cp from a viscosity of a second coating liquid for forming a layer next to the lowermost layer when the second coating liquid flows at a low shear rate and that the first coating liquid, when run at a high shear rate, has a viscosity lower than the viscosity of the second coating liquid when the second coating liquid flows at a high shear rate. The first and second liquids are then applied to a moving web with the slide hopper type coating apparatus.

REFERENCES:
patent: 4113903 (1983-09-01), Choinski

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