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, 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 micro fibrillated cellulose, applying the second suspension either to the first side of the fibrous web or to a surface of a drying equipment and conducting said fibrous web through the drying equipment whereby the second suspension is added 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.

A method for producing dried multilayer paper is provided comprising dewatering a first aqueous fibrous suspension, thereby creating a first fibrous web; dewatering a second aqueous fibrous suspension, thereby creating a second fibrous web; spraying one or more of a first fibrous web and a second fibrous web with a spray solution or spray suspension, thereby producing at least one sprayed fibrous web; assembling the first fibrous web with the second fibrous web; dehydrating the resulting layer compound by pressing; then dehydrating by supplying heat, which creates the dried multilayer paper. The spray solution or spray suspension contains water and at least one water-soluble polymer P. The polymer P is obtained by polymerizing: 40 to 85 mol % of a monomer of Formula I ##STR00001##
in which R.sup.1=H or C.sub.1-C.sub.6-Alkyl; and 15 to 60 mol % of one or more ethylenically unsaturated monomers.

The present invention relates to a method for production of product comprising a first ply, the method comprising the steps of: providing a fibrous suspension comprising fibers; providing said fibrous suspension to a porous medium to form a substrate comprising fibers; providing a first additive suspension comprising a first strengthening agent, wherein the first strengthening agent is microfibrillated cellulose; providing a second additive suspension comprising at least one retention agent and/or at least one drainage agent; dewatering said substrate on said porous medium; performing additive addition to said substrate during said dewatering of said substrate on said porous medium, wherein the additive addition is performed when the substrate has a dry content of less than 20 weight-%, preferably less than 10 weight-%, most preferably less than 7 weight-%, and wherein the additive addition comprises adding at least a layer of said first additive suspension and a layer of said second additive suspension to said substrate by means of multilayer curtain coating, and further dewatering and drying said substrate after said dewatering on said porous medium so as to provide said first ply. The invention also relates to a paper, board or non-woven product obtainable by 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.

The present invention relates to a method for production of product comprising a first ply, the method comprising the steps of: providing a fibrous suspension comprising fibers; providing said fibrous suspension to a porous medium to form a substrate comprising fibers; providing a first additive suspension comprising a first strengthening agent, wherein the first strengthening agent is microfibrillated cellulose; providing a second additive suspension comprising at least one retention agent and/or at least one drainage agent; dewatering said substrate on said porous medium; performing additive addition to said substrate during said dewatering of said substrate on said porous medium, wherein the additive addition is performed when the substrate has a dry content of less than 20 weight-%, preferably less than 10 weight-%, most preferably less than 7 weight-%, and wherein the additive addition comprises adding at least a layer of said first additive suspension and a layer of said second additive suspension to said substrate by means of multilayer curtain coating, and further dewatering and drying said substrate after said dewatering on said porous medium so as to provide said first ply. The invention also relates to a paper, board or non-woven product obtainable by the method.

A method to produce dried single-layer or multi-layer paper is disclosed. The method comprises, for a single-layer paper, preparing and spraying a partially dehydrated first fibrous web with a spray solution or suspension to give a sprayed partially dehydrated first fibrous web, and dehydrating the sprayed partially dehydrated first fibrous web by applying heat to form a dried single-layer paper; or, for a multi-layer paper, preparing and spraying a partially dehydrated layer compound with a spray solution or suspension to form a sprayed layer compound, and dehydrating the sprayed layer compound by applying heat to form a dried multi-layer paper. The spray solution or suspension comprises water and at least one water-soluble polymer P, which is obtained by polymerizing: (i) a monomer of formula H.sub.2CCHNHC(0)R.sup.1, where R.sup.1 is H or C.sub.1-C.sub.6- alkyl; and (ii) one or more ethylenically unsaturated monomers different from monomer (i).

A method for producing dried multilayer paper is provided comprising (A) Dewatering a first aqueous fibrous suspension, thereby creating a first fibrous web, (B) Dewatering a second aqueous fibrous suspension, thereby creating a second fibrous web, (C) Spraying one or more of a first fibrous web and a second fibrous web with a spray solution or spray suspension, thereby producing at least one sprayed fibrous web, (D) Assembling the first fibrous web with the second fibrous web, (E) Dehydrating the resulting layer compound by pressing, then (F) Dehydrating by supplying heat, which creates the dried multilayer paper, wherein the spray solution or spray suspension contains (c-a) Water (c-b) at least one water-soluble polymer P obtained by polymerizing 40 to 85 mol % of a monomer of Formula I

##STR00001## in which R.sup.1=H or C.sub.1-C.sub.6-Alkyl, 15 to 60 mol % of one or more ethylenically unsaturated monomers.

The invention relates to a method for producing dried single-layer or multi-layer paper containing the steps for a single-layer paper

(A) Dewatering a first aqueous fibrous suspension, thereby creating a first fibrous web having a dry content between 14% wt. and 25% wt.,
(D-1) Dehydrating the first fibrous web by pressing, thereby creating a partially dehydrated first fibrous web,
(E-1) Spraying the partially dehydrated first fibrous web on at least one surface side with a spray solution or spray suspension, which results in a sprayed partially dehydrated first fibrous web,
(F-1) Dehydrating the sprayed partially dehydrated first fibrous web by applying heat to form the dried single-layer paper,
or containing the above step (A) and steps for a multi-layer paper
(B) Dewatering a second aqueous fibrous suspension, thereby creating a second fibrous web having a dry content between 14% wt. and 25% wt.,
(C) assembling the first fibrous web to the second fibrous web such that the two fibrous webs touch each other on an entire surface side, thereby resulting in a layer compound,
(D-2) Dehydrating the layer compound by pressing, whereby a partially dehydrated layer compound is formed,
(E-2) Spraying the partially dehydrated layer compound on at least one surface side with a spray solution or spray suspension, whereby a sprayed layer compound is formed,
(F-2) Dehydrating the sprayed layer compound by applying heat means to form the dried multi-layer paper,
wherein the spray solution or spray suspension contains (e-a) Water and (e-b) at least one water-soluble polymer P, which can be obtained by polymerizing of (i) 40 to 85 mol % of a monomer of Formula I

##STR00001##

in the R.sup.1=H or C.sub.1-C.sub.6-Alkyl, (ii) 15 to 60 mol % of one or more ethylenically unsaturated monomers which are different from a monomer of the Formula I,
wherein the total amount of all monomers (i) and (ii) is 100 mol %, and optionally by subsequent partial or complete hydrolysis of the units of the monomers of the formula (I) polymerized into the polymer P to form primary amino or amidine groups, wherein the proportion of water is at least 75% wt., based on the spray solution or the spray suspension.

The present disclosure is drawn to ink fixative solutions, which can consist essentially of a polyvalent metal salt, a holdout additive, and water. The polyvalent metal salt can be present in an amount from about 1 wt % to about 5 wt %, with respect to the entire weight of the ink fixative solution. The holdout additive can be present in an amount from about 2 wt % to about 20 wt %, with respect to the entire weight of the ink fixative solution. The holdout additive can be polyethylene glycol, glycerol, carboxy methyl cellulose, hydroxy ethyl cellulose, a fatty acid, a fatty acid ethoxylate, or combinations thereof.

The present disclosure is drawn to ink fixative solutions, which can consist essentially of a polyvalent metal salt, a holdout additive, and water. The polyvalent metal salt can be present in an amount from about 1 wt % to about 5 wt %, with respect to the entire weight of the ink fixative solution. The holdout additive can be present in an amount from about 2 wt % to about 20 wt %, with respect to the entire weight of the ink fixative solution. The holdout additive can be polyethylene glycol, glycerol, carboxy methyl cellulose, hydroxy ethyl cellulose, a fatty acid, a fatty acid ethoxylate, or combinations thereof.