A coating for paperboard includes polyethylene outer layers and a polyethylene inner layer with calcium carbonate filler. In addition to the lower cost, benefits include a surprising better heat sealing behavior compared with a coating of polyethylene alone.

Recycled or brown paper board is provided having a surface with a coating having one or more layers, at least one coating layer comprising one or more copolymers selected from the group consisting of styrene-acrylic-based copolymers, styrene-butadiene-based copolymers, and mixtures thereof, wherein the average Tg of the copolymers present in the coating layer is 25° C. or greater and the average polymer particle size of the copolymers present in the coating layer is 130 nm or greater. A method of producing a coated recycled paper board or brown paper board and a coating composition are also provided.

The invention relates to a heat-sealable packaging material comprising: a paperboard substrate comprising a first side and a second side, a first coating layer on the first side, a first barrier coating layer on the first coating layer, which first barrier coating layer comprises pigments, a second coating layer on the second side, and a second barrier coating layer on the second coating layer, which second barrier coating layer comprises pigments, wherein the coating layers and the barrier coating layers comprise a latex or a water-soluble polymer, wherein the first coating layer and the second coating layer are free of pigments, wherein the first barrier coating layer and the second barrier coating layer comprise pigments in an amount in a range from >40 wt % to <70 wt %, based on the dry solid content of the respective layer, and wherein the grammage of each of the first and second coating layer and of the first and second barrier coating layer is in a range from >1 g/m2 to <10 g/m2. The invention further relates to a method of manufacturing a respective packaging material and a packaging derived therefrom.

A method of barrier coating a porous substrate, the method comprising: coating a surface of the substrate with an intermediate layer, said intermediate layer filling pores at the surface of the substrate; and coating the intermediate layer with a non-polymer barrier layer.

A layer-structure includes at least a base layer with a top surface and a top layer, wherein the top layer is arranged above the base layer in a height direction, wherein a first color section is partially provided in and/or on the top surface of the base layer, the first color section and the top surface of the base layer having a luminance contrast, wherein the luminance contrast, defined as Weber contrast, has a value that is at least 0.20, and wherein the first color section and the top surface of the base layer are covered by the top layer, so that a watermark visual appearance is provided.

The problem of this invention is to provide a transfer paper with good close contact to fiber materials and good color density of patterns formed on the fiber materials, good peeling, and no significant difference in texture between patterned and non-patterned areas of the fiber materials.

The present invention provides a transfer paper having a base material with one or more non-aqueous resin laminate layer(s) on one side of a base paper, and one or more coating layer(s) on the laminate layer(s) of the base material, wherein an outermost coating layer, which is positioned outermost in the coating layer(s) with respect to the base material, contains a white pigment and a binder, the white pigment contains at least an amorphous silica, and the binder contains at least five types consisting of a water-soluble polyester resin, a carboxylic acid-modified polyvinyl alcohol resin, an acrylic resin, a hydroxypropyl starch and an alginate.

According to an example aspect of the present invention, there is provided a cost-effective method of producing cellulose based films by introducing an intense water removal system to the process, and cellulose based films thereof having improved properties.

The invention relates to a separating base paper, having a mass per unit area of at least 25 g/m.sup.2 and at most 40 g/m.sup.2 and a density of at least 0.90 g/cm.sup.3 and at most 1.15 g/cm.sup.3. The separating base paper comprises at least 50 wt % of long-fiber pulp and is coated on at least one side with at least two coatings. The first coating is located between a paper surface and the second coating. The second coating is a topmost coating and comprises a water-soluble film-forming polymer, nanofibrillated cellulose, microfibrillated cellulose or nanocrystalline cellulose. The Cobb-Unger (120 s) value of the surface having said first and second coatings is at least 0.01 g/m.sup.2 and at most 0.90 g/m.sup.2.

The invention relates to a method of manufacturing a heat-sealable packaging material, the method comprising the steps of: providing a paperboard substrate comprising a top ply, applying a first dispersion barrier layer on the top ply, wherein the first dispersion barrier layer comprises a latex having a first glass transition temperature, and applying a second dispersion barrier layer on the first barrier layer, wherein the second dispersion barrier layer comprises a latex having a second glass transition temperature, wherein the second glass transition temperature is higher than the first glass transition temperature, wherein the grammage of the second dispersion barrier layer is lower than the grammage of the first dispersion barrier layer, and wherein the second dispersion barrier layer comprises pigments. The invention further relates to a respective heat-sealable packaging material.

According to an example aspect of the present invention, there is provided a cost-effective method of producing cellulose based films by introducing an intense water removal system to the process, and cellulose based films thereof having improved properties.