D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
117/104
D21H 1/10 (1980.01)
Patent
CA 1050837
ABSTRACT OF THE DISCLOSURE Cast coating is carried out upon a paper substrate having a surface of improved levelness and uniformity and preferably surfaced with a water insoluble coating which is desirably finished to maximize flatness and gloss, in order to substantially increase cast coating speed, decrease cast coating consumption and, in many circumstances, improve cast coat quality. In pre- ferred practice, the paper substrate of improved levelness and uniformity which is cast coated is provided by pre- coating the paper with an aqueous coating containing a major weight proportion of finely divided solid mineral filler in admixture with a minor weight proportion of non-water absorptive, film-forming, heat-softenable resin in particu- late form and the wet-coated substrate is subjected to an elevated temperature from the coated side of the paper to rapidly heat the exposed surface to a surface temperature in the range of from about 160°F. to about 195°F. and provide a pressure deformable layer at the surface of the paper substrate adjacent the coating, and then passing the par- tially dried coated paper so-produced through the nip between a pair of turning rolls, at least one of which is provided with a heated finishing surface, to cause the resin particles to at least partly coalesce to provide a glossed surface in which the surface of the paper is leveled and rendered uniform.
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