Process for applying a coating to both sides of a running paper

Details Process for applying a coating to both sides of a running paper Process for applying a coating to both sides of a running paper

1979-04-24

1981-09-08

Pianalto, Bernard D.

Coating processes

Application to opposite sides of sheet, web, or strip

B05D 100, B05D 500

Patent

active

042884730

ABSTRACT:
A continuous process for applying a coating to both sides of a paper web in which the web is fed at a speed of at least 400 meters per minute through the nip formed between a rotating applicator roll and an elastically yielding blade. A coating composition is fed into the sumps formed on each side of the web at the nip at a rate such that the amount of coating material applied to the web, calculated as the total of both sides of the web, exceeds 14 grams per square meter. The viscosity of the coating composition is maintained at 400 to 2000 centipoises and the web is withdrawn from the nip so that it is bent away from the applicator roll over the edge of the blade at an angle of between 8.degree. and 12.degree. to the tangient to the roll at the nip, thus reducing or eliminating the formation of mist downstream of the nip.

REFERENCES:
patent: 3489592 (1970-01-01), Wallsten
patent: 4076864 (1978-02-01), Wallsten

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