Process for making multilayer coated paper or paperboard

The method of any of the preceding claims, wherein at least one of the layers forming the composite free falling curtain is pigmented.

The method of any of the preceding claims, wherein at least one layer of the curtain is pigmented, and at least one pigment comprises clay, talc, a carbonate, or TiO2.

The method of any of the preceding claims, wherein the solids content of at least one of the layers forming the composite free falling curtain is at least 60 wt-percent.

The method of any of the preceding claims, wherein the coat weight of each layer is from 0.1-30 g/m2.

The method of any of the preceding claims, wherein the coat weight of the top layer is from 0.1-30 g/m2 and the coat weight of the layer contacting the basepaper or baseboard is from 0.1-30 g/m2.

The method of any of the preceding claims, wherein at least one of the coating layers impart functionality selected from printability properties, barrier properties, optical properties, release properties, and adhesive properties.

The method of any of the preceding claims, wherein the coated paper or paperboard has a gloss of less than 45.

The method of any of the preceding claims, wherein the coated paper or paperboard has an average crater density of not more than 10 craters per cm2.

The method of any of the preceding claims, wherein sizing and coating are conducted simultaneously.

The method of any of the preceding claims, wherein the at least one layer of the curtain comprises an optical brightening agent.

The method of any of the preceding claims, wherein curtain comprises at least one coating layer.

The method of any of the preceding claims, wherein the coat weight of the top layer is lower than the total coat weight of the layer(s) beneath it.

The method of any of the preceding claims, wherein the top layer comprises a glossing formulation comprising at least one gloss additive selected from synthetic polymer pigments and gloss varnishes.

The method of any of the preceding claims, wherein the top layer comprises a pigment and a binder, wherein the pigment is a synthetic polymer pigment, and wherein the binder is a latex.

The method of any of the preceding claims, wherein the binder is selected from a carboxylated latex, styrene-butadiene latex, styrene-acrylate latex, styrene-butadiene-acrylonitrile latex, styrene-maleic anhydride latex, styrene-acrylate-maleic anhydride latex, polysaccharides, proteins, polyvinyl pyrrolidone, polyvinyl alcohol, polyvinyl acetate, cellulose and cellulose derivatives.

Paper or paperboard having at least two coating layers obtainable by a method according to any of the preceding claims.

A coated printing paper wherein the coating has at least 3 layers and a total coat weight of at most 10 g/m2.

A coated printing paper having a gloss of at least 70 and a top layer coat weight of 1 g/m2 or less.

A method of manufacturing multilayer coated papers and paperboards that are especially suitable for printing, packaging and labeling purposes, but excluding photographic papers and pressure sensitive copying papers, in which at least two liquid layers selected from aqueous emulsions or suspensions are formed into a composite, free-falling curtain and a continuous web of basepaper or baseboard is coated with the composite coating curtain.

A process comprising:

• forming a composite, multilayer free-flowing curtain;
• and contacting the curtain with a continuous web substrate of base paper or paperboard, the web having a velocity of at least 1400 meters per minute.

A coating process comprising contacting a moving web of paper with a composite curtain coating having a solids content of at least 45 percent wherein the curtain has at least 2 component layers, wherein a first layer is oriented such that it comes into direct contact with the web, has a coat weight of from about 0.1 to about 60 g/m2, and contains from about 0.2 to about 10 weight percent polyvinyl alcohol based on the total composition of the first layer, wherein at least one layer other than the first layer contains a pigment and a binder, and wherein a top layer optionally contains a glossing additive.