The invention discloses a paperboard for packaging of a heat-sealable packaging material comprising: —a paperboard substrate comprising a first and a second side, —a first and an optional second dispersion coating layer on the first side, which first and optional second dispersion coating layer provides a barrier against at least one of liquid, moisture, grease and gas, —an extrusion coated barrier layer comprising a polyolefin, wherein the first and optional second dispersion coating layer is applied between the paperboard substrate and the extrusion coated barrier layer, and wherein the coat weight of the extrusion coated barrier layer is less than 15 gsm. The packaging material according of the invention minimizes the amount of plastic coating, but still provides the needed barrier properties for the packaging of food and/or liquid. The packaging material has especially been shown to provide a longer shelf life for food items packed in a packaging made from the material. Especially, the packaging material provides gas-, liquid and/or grease barrier properties. Although the packaging material comprises such low amount of extruded thermoplastic polymers, the material is readily heat-sealable.

The invention discloses a paperboard for packaging of a heat-sealable packaging material comprising: —a paperboard substrate comprising a first and a second side, —a first and an optional second dispersion coating layer on the first side, which first and optional second dispersion coating layer provides a barrier against at least one of liquid, moisture, grease and gas, —an extrusion coated barrier layer comprising a polyolefin, wherein the first and optional second dispersion coating layer is applied between the paperboard substrate and the extrusion coated barrier layer, and wherein the coat weight of the extrusion coated barrier layer is less than 15 gsm. The packaging material according of the invention minimizes the amount of plastic coating, but still provides the needed barrier properties for the packaging of food and/or liquid. The packaging material has especially been shown to provide a longer shelf life for food items packed in a packaging made from the material. Especially, the packaging material provides gas-, liquid and/or grease barrier properties. Although the packaging material comprises such low amount of extruded thermoplastic polymers, the material is readily heat-sealable.

In manufacturing two-sided laminated cardboard (1) in a laminating apparatus (10), by controlling band tensions of a first outer layer (11) and a second outer layer (12), a torque difference between an exerted first torque (Q1) in an upper roller (21) and an exerted second torque (Q2) in a lower roller (22) is controlled towards a pre-determined value (ΔQ) of said torque difference, while at the same time a torque addition sum of the first torque and the second torque is controlled towards a pre-determined constant value (Q) of said torque addition sum. Thus the invention provides an effective and reliable solution for counteracting concaveness or convexness, in the conveying direction (MD), of the two-sided laminated cardboard (1) to be manufactured.

In manufacturing two-sided laminated cardboard (1) in a laminating apparatus (10), by controlling band tensions of a first outer layer (11) and a second outer layer (12), a torque difference between an exerted first torque (Q1) in an upper roller (21) and an exerted second torque (Q2) in a lower roller (22) is controlled towards a pre-determined value (ΔQ) of said torque difference, while at the same time a torque addition sum of the first torque and the second torque is controlled towards a pre-determined constant value (Q) of said torque addition sum. Thus the invention provides an effective and reliable solution for counteracting concaveness or convexness, in the conveying direction (MD), of the two-sided laminated cardboard (1) to be manufactured.

A coating composition is described that can be completely biodegradable and well suited for use in laminating films to substrates. The coating composition contains a biodegradable polymer, such as a polyvinyl alcohol polymer. The coating composition can be applied to a biodegradable film and then adhered to a substrate, such as a paper substrate.

A coating composition is described that can be completely biodegradable and well suited for use in laminating films to substrates. The coating composition contains a biodegradable polymer, such as a polyvinyl alcohol polymer. The coating composition can be applied to a biodegradable film and then adhered to a substrate, such as a paper substrate.

The present invention relates to a method for the production of a coated paper, paperboard or film, wherein the method comprises the steps of; providing a first suspension comprising cellulose fibers and/or nanocellulose, applying the first suspension on a substrate to form a fibrous web, wherein the web has a first and a second side, providing a second suspension comprising polymers and/or particles wherein the second suspension has a Brookfield viscosity above 3000 m Pas at a dry content between 4%-40% by weight, providing at least one calender comprising at least one roll or belt, applying the second suspension to the surface of the at least one calender roll or belt forming a coating web and conducting said fibrous web through the at least one calender whereby the coating web is applied to the first side of the web forming the coated paper, paperboard or film. The invention also relates to a paper, paperboard or film produced according to the method.

The present invention relates to a method for the production of a coated paper, paperboard or film, wherein the method comprises the steps of; providing a first suspension comprising cellulose fibers and/or nanocellulose, applying the first suspension on a substrate to form a fibrous web, wherein the web has a first and a second side, providing a second suspension comprising polymers and/or particles wherein the second suspension has a Brookfield viscosity above 3000 m Pas at a dry content between 4%-40% by weight, providing at least one calender comprising at least one roll or belt, applying the second suspension to the surface of the at least one calender roll or belt forming a coating web and conducting said fibrous web through the at least one calender whereby the coating web is applied to the first side of the web forming the coated paper, paperboard or film. The invention also relates to a paper, paperboard or film produced according to the method.

[Problem] The problem that unevenness occurs in the foam layer and the insulating property deteriorates when lamination is carried out at high speed was clarified in a process for producing a sheet for a foam insulating paper container. Specifically, the problem addressed by the present invention is to provide a sheet for a foam insulating paper container that can be foamed without unevenness even when laminated at high speed.

[Solution] The present inventors discovered that the problem addressed by the present invention can be solved by a method for producing a sheet for a foam insulating paper container in which a polyethylene resin is laminated on at least one side of a paper substrate, wherein the method for producing a sheet for a foam insulating paper container is characterized in that the lamination conditions are an air gap of 150 mm or greater and a take-off speed of 70 m/min or higher.

[Problem] The problem that unevenness occurs in the foam layer and the insulating property deteriorates when lamination is carried out at high speed was clarified in a process for producing a sheet for a foam insulating paper container. Specifically, the problem addressed by the present invention is to provide a sheet for a foam insulating paper container that can be foamed without unevenness even when laminated at high speed.

[Solution] The present inventors discovered that the problem addressed by the present invention can be solved by a method for producing a sheet for a foam insulating paper container in which a polyethylene resin is laminated on at least one side of a paper substrate, wherein the method for producing a sheet for a foam insulating paper container is characterized in that the lamination conditions are an air gap of 150 mm or greater and a take-off speed of 70 m/min or higher.