Method of producing medium-grade coated paper containing...

Details Method of producing medium-grade coated paper containing... Method of producing medium-grade coated paper containing...

B - Operations, Transporting

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B05D 1/00 (2006.01) B41M 1/36 (2006.01) D21H 11/10 (2006.01) D21H 19/38 (2006.01)

Patent

CA 1145211

ABSTRACT OF THE DISCLOSURE A method of producing medium-grade coated paper for web offset printing, in which paper heat-set roughening has been reduced, is disclosed herein. The method comprises applying a coating composition to both surfaces of base paper containing one or more high-yield pulps in a amount equal to 10% to 100% by weight of the fiber content thereof and one or more chemical pulps in an amount equal to 0% to 90% by weight of the fiber content thereof, said high-yield pulp component having a 42-mesh fiber fraction content of less than 30% by weight. The coating composition contains natural ground calcium carbonate with a specific surface area of from 1.5 to 5 m2/g under the following conditions: (i) when the specific surface area is from 1.5 to 2.5 m2/g; the natural ground calcium carbonate is employed in a proportion of from 10% to (9OS-125)% by weight of the total pigment content of the coating composition where "S" represents the specific surface area in m2/g of the natural ground calcium carbonate, and (ii) when the specific surface area is from 2.5 to 5 m2/g; said natural ground calcium carbonate is employed in a proportion of from 10% to 100% by weight of the total pigment content of the coating composition.

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