A coated paperboard is disclosed which includes a printable coating containing substantially no fluorochemical or wax in which the coated paperboard is fully compostable as well as repulpable, and exhibits no tendency toward blocking. The coating may be a multiple layer coating.

A coated paperboard is disclosed which includes a printable coating containing substantially no fluorochemical or wax in which the coated paperboard is fully compostable as well as repulpable, and exhibits no tendency toward blocking. The coating may be a multiple layer coating.

A coated paperboard (100) comprising: a base substrate (102) having a brightness of about 65 or less measured using TAPPI T452 and a coating (104) on at least one side of the base substrate, wherein the base substrate comprises: one or more opaque layers (114) including a white filler, wherein the opaque layer covers the base substrate so that visibility of the base substrate through the opaque layer is substantially eliminated; a barrier layer (116) covering the opaque layer; wherein the barrier layer substantially prevents aqueous fluids from contacting the opaque layer, and wherein the coated paperboard has a brightness on the side of the base substrate with the coating of about 65 or more measured using TAPPI T452, and a wet brightness drop, on the side of the base substrate with the coating, of about 30 or less, measured using the wet brightness drop test.

A coated paperboard (100) comprising: a base substrate (102) having a brightness of about 65 or less measured using TAPPI T452 and a coating (104) on at least one side of the base substrate, wherein the base substrate comprises: one or more opaque layers (114) including a white filler, wherein the opaque layer covers the base substrate so that visibility of the base substrate through the opaque layer is substantially eliminated; a barrier layer (116) covering the opaque layer; wherein the barrier layer substantially prevents aqueous fluids from contacting the opaque layer, and wherein the coated paperboard has a brightness on the side of the base substrate with the coating of about 65 or more measured using TAPPI T452, and a wet brightness drop, on the side of the base substrate with the coating, of about 30 or less, measured using the wet brightness drop test.

A coated paperboard is disclosed which includes a barrier coating containing substantially no fluorochemical or wax, exhibiting good resistance to oil and grease, no tendency toward blocking, the coated paperboard being fully repulpable as well as compostable. The coated paperboard may further have a printable coating on a surface opposite from the barrier coating.

A coated paperboard is disclosed which includes a barrier coating containing substantially no fluorochemical or wax, exhibiting good resistance to oil and grease, no tendency toward blocking, the coated paperboard being fully repulpable as well as compostable. The coated paperboard may further have a printable coating on a surface opposite from the barrier coating.

The present invention relates to a method for manufacturing a multiply paperboard, comprising forming a first web on a first wire, a second web on a second wire and a third web on a third wire. The second web comprises a delamination web layer formed from a second pulp suspension comprising 5-80 weight-% refined CTMP and/or CMP. A first coating layer comprising 0.2-20 g/m.sup.2 starch is applied to a non-wire side of the first web by curtain application. A second coating layer comprising 0.2-20 g/m.sup.2 starch is applied to a non-wire side of the second web or the third web by curtain application. A multilayer web is formed by joining the third web with the second web via the second bonding layer and by joining the second web and the first web via the first bonding layer. The multilayer web is further dewatered and optionally dried to form the multiply paperboard. The invention relates also to a multiply paperboard.

The present invention relates to a method for manufacturing a multiply paperboard, comprising forming a first web on a first wire, a second web on a second wire and a third web on a third wire. The second web comprises a delamination web layer formed from a second pulp suspension comprising 5-80 weight-% refined CTMP and/or CMP. A first coating layer comprising 0.2-20 g/m.sup.2 starch is applied to a non-wire side of the first web by curtain application. A second coating layer comprising 0.2-20 g/m.sup.2 starch is applied to a non-wire side of the second web or the third web by curtain application. A multilayer web is formed by joining the third web with the second web via the second bonding layer and by joining the second web and the first web via the first bonding layer. The multilayer web is further dewatered and optionally dried to form the multiply paperboard. The invention relates also to a multiply paperboard.

A curtain coating device for paper and board machines has a nozzle beam (10) with a nozzle lip (12) with an edge strip (11) for feeding the coating color curtain and edge guides (20) located along each edge of the nozzle lips (12) controlling the width of the coating color curtain. The edge guide (20) has upper and lower ends. Flow surfaces (22) extend in a substantially vertical direction parallel and next to each other. The edge guide has a lubrication feed (24), additional lubrication feeds (26) and a suction opening (27). The flow surfaces (22) are inclined toward each other forming a flow guide recess (25) which extends in a vertical direction such that the form of the flow surfaces (22) with the flow guide recess (25) is concave. A protrusion (21) extends within the recess in the direction of the flow guide recess (25).

A curtain coating device for paper and board machines has a nozzle beam (10) with a nozzle lip (12) with an edge strip (11) for feeding the coating color curtain and edge guides (20) located along each edge of the nozzle lips (12) controlling the width of the coating color curtain. The edge guide (20) has upper and lower ends. Flow surfaces (22) extend in a substantially vertical direction parallel and next to each other. The edge guide has a lubrication feed (24), additional lubrication feeds (26) and a suction opening (27). The flow surfaces (22) are inclined toward each other forming a flow guide recess (25) which extends in a vertical direction such that the form of the flow surfaces (22) with the flow guide recess (25) is concave. A protrusion (21) extends within the recess in the direction of the flow guide recess (25).