SE535270C2 - A method for coating paper or cardboard - Google Patents
A method for coating paper or cardboard Download PDFInfo
- Publication number
- SE535270C2 SE535270C2 SE1050851A SE1050851A SE535270C2 SE 535270 C2 SE535270 C2 SE 535270C2 SE 1050851 A SE1050851 A SE 1050851A SE 1050851 A SE1050851 A SE 1050851A SE 535270 C2 SE535270 C2 SE 535270C2
- Authority
- SE
- Sweden
- Prior art keywords
- paper
- board
- surface treatment
- treatment agent
- calender
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000011248 coating agent Substances 0.000 title description 2
- 238000000576 coating method Methods 0.000 title description 2
- 239000011087 paperboard Substances 0.000 title description 2
- 239000011111 cardboard Substances 0.000 title 1
- 239000012756 surface treatment agent Substances 0.000 claims abstract description 46
- 238000003490 calendering Methods 0.000 claims abstract description 17
- 238000007639 printing Methods 0.000 claims abstract description 12
- 238000004381 surface treatment Methods 0.000 claims abstract description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 24
- 238000005507 spraying Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 5
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 4
- 229920002472 Starch Polymers 0.000 claims description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 3
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 3
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 3
- 239000008107 starch Substances 0.000 claims description 3
- 235000019698 starch Nutrition 0.000 claims description 3
- 229920002488 Hemicellulose Polymers 0.000 claims description 2
- 150000001720 carbohydrates Chemical class 0.000 claims description 2
- 239000005018 casein Substances 0.000 claims description 2
- BECPQYXYKAMYBN-UHFFFAOYSA-N casein, tech. Chemical compound NCCCCC(C(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(CC(C)C)N=C(O)C(CCC(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(C(C)O)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(COP(O)(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(N)CC1=CC=CC=C1 BECPQYXYKAMYBN-UHFFFAOYSA-N 0.000 claims description 2
- 235000021240 caseins Nutrition 0.000 claims description 2
- 229920005610 lignin Polymers 0.000 claims description 2
- 235000018102 proteins Nutrition 0.000 claims description 2
- 102000004169 proteins and genes Human genes 0.000 claims description 2
- 108090000623 proteins and genes Proteins 0.000 claims description 2
- 239000011347 resin Substances 0.000 claims description 2
- 229920005989 resin Polymers 0.000 claims description 2
- 239000004816 latex Substances 0.000 claims 1
- 229920000126 latex Polymers 0.000 claims 1
- 239000000123 paper Substances 0.000 description 83
- 239000007864 aqueous solution Substances 0.000 description 9
- 239000007921 spray Substances 0.000 description 9
- 239000000203 mixture Substances 0.000 description 5
- 229920001131 Pulp (paper) Polymers 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005282 brightening Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000007646 gravure printing Methods 0.000 description 1
- 238000007641 inkjet printing Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000007645 offset printing Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
- D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod
- D21H25/14—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod the body being a casting drum, a heated roll or a calender
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/24—Addition to the formed paper during paper manufacture
- D21H23/26—Addition to the formed paper during paper manufacture by selecting point of addition or moisture content of the paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
- D21H23/42—Paper being at least partly surrounded by the material on both sides
- D21H23/44—Treatment with a gas or vapour
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/25—Cellulose
- D21H17/26—Ethers thereof
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/28—Starch
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/36—Polyalkenyalcohols; Polyalkenylethers; Polyalkenylesters
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/16—Sizing or water-repelling agents
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/18—Reinforcing agents
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/50—Spraying or projecting
Landscapes
- Paper (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Abstract The invention relates to a method for the surface treatment ofpaper or board, which method comprises adding a surfacetreatment agent to the paper or board and calendering saidpaper or board in at least one calender nip formed by a firstand a second calender roll. The method is characterized inthat the surface treatment agent is applied onto the surfaceof at least one side of the paper or board immediately priorto or after the calender nip, while the paper or board is incontact with one of the calender rolls. The method of theinvention makes it possible to surface treat a paper or boardwith a small amount of a surface treatment agent, but yetachieve a high printing quality at the printing of the surface treated paper or board.
Description
A method for the surface treatment of paper or board Technical Field The present invention relates to a method for the surfacetreatment of paper or paper board. The invention furtherrelates to a method for manufacturing paper or board and a paper or board produced by the method.
Background Paper, board and other fibre-based webs are often treated withsurface treatment agents, such as surface sizing compositions,in order to improve the surface strength and the printability of the paper or board. Usual surface treatment agents used in the art are e.g. starch, carboxymethyl cellulose (CMC), and/orpolyvinyl alcohol. The predominant method of applying surface treatment agents to the surface of a paper is by use of a size press.
WO20lOOl9302 describes a method. for making' paper, in. whichmethod a layer of surface treatment agent is applied onto thesurface of a base paper by means of a roll comprising recessesthat are filled with the treatment agent. The amount ofsurface treatment agent applied to the paper is, according to WO20lOOl9302, at most 0.8 g/m2/side of the paper.
WO20lOOl8302 describes a method for manufacturing paper, inwhich method the paper is calendered and coated in order toimprove the printing properties. The coating is applied in anamount of about 3 g/HF/side by film transfer or by spray coating.
In the art, there has been a demand of reducing the amount ofsurface treatment agents applied to the paper. However,reduced amount of surface treatment agents oftentimes affectsthe quality of the printing negatively since it is hard toachieve an even coverage of the surface treatment agents and an acceptable sizing profile.
Summary of the invention One object of the present invention is to provide a method forsurface treating a paper or board with a small amount of asurface treatment agent, but yet achieving a high printing quality at the printing of the surface treated paper or board.
This, and other advantages, are achieved with the presentinvention. The present invention relates to a method for thesurface treatment of paper or board, which method comprisesadding a surface treatment agent to the paper or board andcalendering said paper or board in at least one calender nipformed by a first and a second calender roll. The method ischaracterized in that the surface treatment agent is appliedonto the surface of at least one side of the paper or boardimmediately prior to or after the calender nip, while the paper or board is in contact with one of the calender rolls.
It has been shown that when the surface treatment agent isapplied onto the surface immediately prior to or after thecalender nip, while the paper or board is in contact with oneof the calender rolls, the surface treatment agent stays onthe surface of the paper or board and no significant amount ofsurface treatment agent penetrates into the paper or board.Consequently, less amount of the surface treatment agent canbe applied to the surface while a high printing quality still can be achieved.
The surface treatment agent may be applied onto the paper orboard e.g. by contactless film transferring or by spraying.Preferably, the surface treatment agent is applied onto thepaper or board by spraying. Spraying the treatment agent ontothe paper or board gives rise to a more even coverage and spray pattern.
In one preferred embodiment, the surface treatment agent issprayed onto the paper or board in an atomized state. This maybe achieved by atomizing an aqueous solution of the treatmentagent at an enhanced pressure and an enhanced temperature.Spraying of the high temperature treatment agent onto thesurface of the paper/board gives rise to a high temperature atthe surface of the paper/board. Preferably, the atomizedmedium comprising the surface treatment agent has atemperature of at least 80°C, preferably between 80-llO°C evenmore preferably between 9O~l0OOC, most preferably atemperature of 95°C. In this way, a heat and moisture gradientis formed in the paper/board, whereby the temperature at thesurface of the paper/board is higher than the temperatureinside the paper/board. This improves the effect of thecalendering, whereby the gloss and smoothness of the paper/board is increased and the bulk is increased.
The surface treatment agent may be applied onto the surface ofthe paper or board in an amount of below 0,5 g/m2/side of thepaper or board, preferably between O,l~O,5 g/m2/side, and morepreferably between 0,l~0,2 g/HF/side, calculated as dry weightof the surface treatment agent applied to the paper or board.Surprisingly, it has been found that it is possible to applysuch small amount of a surface treatment agent to the paper or board and yet to achieve an excellent printing quality.
The temperature of the paper or board being sprayed with thesurface treatment agent is preferably at least 50°C, morepreferably at least 55°C, and most preferably at least 60°CThe paper or board achieves the desired temperature by beingheated by the calender cylinder in contact with the paper orboard and/or by the heat transferred to the paper/board withthe atomized surface treatment agent. The high temperature ofthe paper or board makes water applied together with thesurface treatment agent to evaporate quickly whereby thesurface treatment agent is kept on the surface of the paper or board.
The method of the invention does not wet the papersignificantly, and, consequently, no additional drying of thepaper after the application of the surface-treatment agent is needed.
The moisture content of the paper or board may be between 3-12%, preferably between 4-lO% by weight at the point ofspraying the treatment agent onto the surface. This furthercontributes to the prevention of the treatment agent topenetrate into the paper/board, and thus, being kept on the surface of the paper/board.
The surface treatment agent applied onto the surface inaccordance with the invention may be any water soluble surfacetreatment agent. Preferably, the treatment agent is selectedfrom the group consisting of starch, carboxymethyl cellulose(GMC), nano~pigment, salt of multivalent metals such ascalcium chloride, casein, protein, lignin, saccharide,hemicelluloses, wax or resin, polyvinyl alcohol (PVA), latexand Optical brightening agents (OBAs), water-based release agents or a combination of any of these.
The invention further relates to a method of manufacturing apaper or board comprising the steps of forming a fibrous webfrom pulp, dewatering the formed web, spraying a surfacetreatment agent onto the surface of the web and calenderingthe web in at least one calender nip formed by a first and asecond calender roll. The method of manufacturing a paper orboard is characterized in that the surface treatment agent issprayed onto the surface of at least one side of the paper orboard immediately prior to or after the calender nip, whilethe paper or board is in contact with one of the calender rolls.
The invention further relates to a paper or board manufacturedby said method. The paper or board manufactured by said method exhibit excellent printing and surface strength properties.
The paper or board treated by the method of the invention ismost suitable for offset printing, but can for example alsoadvantageously be printed in gravure or ink-jet printing methods.
Detailed description In accordance with the present invention, a surface treatmentagent is sprayed onto the surface of a paper or boardimmediately prior to or after a calender nip while the paperor board is in contact with a calender roll. It has been foundthat by choosing said point of application, a small amount ofsurface treatment agent may be applied to the paper/boardwhile an excellent printing quality still may be obtained. Thecontact with the calender roll provides the paper or boardwith a relative high temperature, preferably of above 50°C,more preferably of above 55°C, and most preferably of above60°C, whereby the water added together with the surfacetreatment agent is instantly evaporated. Moreover, at thispoint of application, i.e. after the last drying unit and inthe calender, the paper or board exhibits a comparatively lowBendtsen roughness, as compared to application points of priorart. The low Bendtsen roughness of the paper furthercontributes to keeping the applied surface treatment agent onthe surface of the paper or board and prohibits it to penetrate into the paper or board.
In this context, immediately prior to or after the calendernip means milliseconds prior to or after the calender nip,preferably between 5-100 ms, even more preferably between lO - 50 ms, or 10 ~ 30 ms prior to or after the calender nip.
The surface treatment agent is preferably applied to thesurface of the paper or board by spraying it in an atomizedstate. This can, e.g , be achieved by mixing an aqueous solution of the treatment agent with steam at increase pressure and temperature whereby an atomized aqueoussolution/steam mixture is formed. Preferably, the atomizedaqueous solution/steam mixture has a temperature of at least80°C, preferably between 80 - 110 OC even more preferablybetween 90 ~ 100 OC, most preferably of 95 OC. Application ofa high temperature, atomized medium comprising a surfacetreatment agent onto the paper/board surface at the calendergives the paper/board a high surface temperature whichimproves the effect of the calendering. A temperature gradientis formed in the paper/board with the highest temperature at the surface, which is beneficial for the calendering.
The aqueous solution comprising the treatment agent may have aconcentration of above 5%, more preferably of above 10%(weight%?). This allows an efficient transfer of the surfacetreatment agent to the paper or board while the strength ofthe surface of the paper/board is not negatively affected bythe water in the aqueous solution. Preferably, the viscosity of the aqueous solution does not exceed 100 mPas.
The water amount added by applying the aqueous solution ontothe paper/board is preferably below 4.0 g/m2, e.g. between 0.5and 4.0 g/mg. This low amount of water applied to thepaper/board does not affect the surface strength of the paper/board negatively.
The calender used in accordance with the invention may be anon-line or an off-line calender, depending on the paper orboard quality to be produced. The calender may be any kind of a calender, such as a machine calender or a super calender.
The surface treatment agent may be sprayed onto the surface ofthe paper/board immediately prior to, or immediately after,the first calender nip. The surface treatment agent may alsobe sprayed onto the surface of the paper/board immediatelyprior to, or immediately after a second or a third calender nip. Preferably, the paper or board is calendered in at least one nip after the surface treatment agent has been applied tothe paper/board. Most preferably, the paper or board is also,or alternatively, calendered in at least one nip before thesurface treatment agent is applied to the paper/board. In thisway, the surface roughness of the paper/board may be decreasedeven further before the surface treatment agent is applied,which contributes to the prevention of the treatment to penetrate into the paper/board.
In case a machine calender is used in accordance with theinvention, the nip pressure may be at least 60 kN/m,preferably at least 65 kN/m and most preferably between 70-85kN/m.
Both sides of the paper/board may be treated in accordancewith the method of the invention. This may be accomplished by,e.g., spraying a treatment agent onto the first side of thepaper or board immediately prior to a first nip, while thepaper or board is in contact with a first calender roll andspraying a treatment agent onto the second side of the paperor board immediately prior to a second nip, while the paper or board is in contact with a second calender roll.
The paper or board treated by the method according to theinvention may be any kind of paper or board. Preferably, the paper or board is a mechanical pulp based, un-coated, base paper.
The invention is further described by way of an example with reference to fig 1.
Example An uncoated base paper, 52 gsm, comprising a mix ofchemical and mechanical pulp, is treated in an on~line 2~nipcalender as shown in fig. l. The web speed is 1260 m/min andthe machine width is 8550 mm. The calender comprises a first (1) and a second (2) calender roll, forming a first calendering nip (Nl) and a third (3) and a fourth (4) calenderroll, forming a second calendering nip (N2). The nip (NO)between the second (2) and the third (3) calendering roll isan open nip. Thus, the stack of rolls in the calender consistsof four rolls placed one above the other. The first (l) andforth (4) calender rolls are cambered thermo rolls which areheated to a temperature of approximately 58°C. The second (2)and third (3) rolls are metal covered rolls. The nip pressuresare between 78 ~ 82 kN/m. A calcoil unit (not shown) may be arranged on the fourth (4) calender roll.
The web of the base paper (W) is guided from the last dryingunit into the first nip (Nl) with the aid of a guiding roll(5). The web is supported and guided by the calendering rolls(2) and (3) through the open nip (NO) into the secondcalendering nip (N2). After the second calendering nip (N2),the web (W) is passed to another calendering stack or to reeling.
A first spray unit (6) is arranged at the second calender roll(2). A second spray unit (7) is arranged at the third calenderroll (3). The spray units (6 and 7) mix an aqueous solution ofthe treatment agent with steam at enhanced temperature andpressure, whereby the aqueous solution sprayed onto thesurface of the web (w) in an atomized state. The distancebetween the nozzles of the spray units and the paper is approximately lO cm.
The first spray unit (6) sprays a surface treatment agent, forexample CMC and/or PVA, to one side of the web (W) immediatelyafter (26 ms) the first calendering nip (Nl), while the web(W) is in contact with the second calender roll (2). Thesecond spray unit (7) sprays a surface treatment agent to theother side of the web immediately prior to (26 ms) the secondcalendering nip (N2), while the web (W) is in contact with the third calendering roll (3).
While the above example has been shown for purpose ofillustrating the invention, it will be apparent to thoseskilled in the art that various changes in the invention disclosed herein may be made without departing from the scopeof the invention, which is defined in the appended claims. Forexample, the number of calendering rolls and calender nips maybe increased and decreased and the type of the rolls, thelength and the pressure of the nips may be varied.
Claims (10)
1. .A method for the surface treatment of paper or board, which method comprises adding a surface treatment agentto the paper or board and calendering said paper or boardin at least one calender nip formed by a first and asecond calender roll characterized in that the surfacetreatment agent is applied onto the surface of at leastone side of the paper or board immediately prior to orafter the calender nip, while the paper or board is in contact with one of the calender rolls. .A method according to claim l, wherein said surface treatment agent is sprayed onto the surface of the paper or board. .A method according to claim 2, wherein said surface treatment agent is sprayed onto the surface of the paper or board in an atomized state. .A method according to anyone of claims 1-3, wherein the surface treatment agent is applied onto the surface ofthe paper or board in an amount of below 0,5 g/m2/side ofthe paper or board, preferably between 0,1 - 0,2g/m2/side, calculated as dry weight of the surface treatment applied to the paper or board. .A method according to anyone of claims l-4, wherein the temperature of the paper or board is at least 50 OC when the surface treatment agent is sprayed onto the surface. .A method according to anyone of claims l~5, wherein the moisture content of the paper or board is between 3 -14%, more preferably between 4-l0% by weight when the surface treatment agent is sprayed onto the surface. 7. l0. 11 A method according to anyone of claims l-6, wherein the surface treatment agent is selected from the group consisting of starch, carboxymethyl cellulose (GMC), saccharide, hemicelluloses, Wax (PVA), casein, protein, lignin, or resin, polyvinyl alcohol water-based release agents and latex or a combination of any of these. .A method according to anyone of claims 1-7, wherein the paper or board treated by the method is printing paper orboard, preferably offset, digital or rotogravure printing paper or board .A method of manufacturing a paper or board comprising the steps of;a. forming a fibrous web from pulp, andkr dewatering the formed webc.spraying a surface treatment agent onto the surface ofthe web and calendering the web in at least onecalender nip formed by a first and a second calenderroll, characterized in that the surface treatment agentis applied onto the surface of at least one side of thepaper or board immediately prior to or after thecalender nip, while the paper or board is in contact with one of the calender rolls. A paper or board produced by the method according to claim 9.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE1050851A SE535270C2 (en) | 2010-08-12 | 2010-08-12 | A method for coating paper or cardboard |
| PL11816159T PL2603636T3 (en) | 2010-08-12 | 2011-07-05 | A method for the surface treatment of paper or board and a paper or board produced according to the method |
| EP11816159.5A EP2603636B1 (en) | 2010-08-12 | 2011-07-05 | A method for the surface treatment of paper or board and a paper or board produced according to the method |
| PCT/IB2011/052957 WO2012020334A1 (en) | 2010-08-12 | 2011-07-05 | A method for the surface treatment of paper or board and a paper or board produced according to the method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE1050851A SE535270C2 (en) | 2010-08-12 | 2010-08-12 | A method for coating paper or cardboard |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| SE1050851A1 SE1050851A1 (en) | 2012-02-13 |
| SE535270C2 true SE535270C2 (en) | 2012-06-12 |
Family
ID=45567409
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE1050851A SE535270C2 (en) | 2010-08-12 | 2010-08-12 | A method for coating paper or cardboard |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2603636B1 (en) |
| PL (1) | PL2603636T3 (en) |
| SE (1) | SE535270C2 (en) |
| WO (1) | WO2012020334A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10947404B2 (en) | 2016-07-21 | 2021-03-16 | Hewlett-Packard Development Company, L.P. | Ink fixative solution |
| EP4283039A1 (en) | 2022-05-24 | 2023-11-29 | Andritz Küsters GmbH | Device for smoothing and applying an application medium |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5045342A (en) * | 1989-01-27 | 1991-09-03 | Measurex Corporation | Independent heat moisture control system for gloss optimization |
| FI108061B (en) * | 1995-10-05 | 2001-11-15 | Metso Paper Inc | Method for coating a paper or cardboard web |
| SE506597C2 (en) * | 1996-05-20 | 1998-01-19 | Sca Graphic Sundsvall Ab | Method and apparatus for making LWC paper |
| FI104745B (en) * | 1998-06-25 | 2000-03-31 | Valmet Corp | Method and apparatus for calendering paper and cardboard |
| FI20011429A0 (en) * | 2001-07-02 | 2001-07-02 | Upm Kymmene Corp | Printing paper and process for its manufacture |
| US8022869B2 (en) | 2008-05-29 | 2011-09-20 | Qualcomm Incorporated | Apparatus and method for cross-correlation spur mitigation |
| FI20085765A0 (en) | 2008-08-11 | 2008-08-11 | Upm Kymmene Corp | Process for producing printing paper |
-
2010
- 2010-08-12 SE SE1050851A patent/SE535270C2/en unknown
-
2011
- 2011-07-05 EP EP11816159.5A patent/EP2603636B1/en active Active
- 2011-07-05 WO PCT/IB2011/052957 patent/WO2012020334A1/en active Application Filing
- 2011-07-05 PL PL11816159T patent/PL2603636T3/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| EP2603636A4 (en) | 2014-10-22 |
| PL2603636T3 (en) | 2019-12-31 |
| EP2603636A1 (en) | 2013-06-19 |
| SE1050851A1 (en) | 2012-02-13 |
| WO2012020334A1 (en) | 2012-02-16 |
| EP2603636B1 (en) | 2019-08-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4883564A (en) | Creping device adhesive formulation | |
| CA2643891C (en) | Method for treating a substrate | |
| US7749583B2 (en) | Low density paperboard | |
| US8673398B2 (en) | Method for treating a substrate | |
| CN104195883B (en) | Papermaking process | |
| KR20020047147A (en) | Surface finishing of paper or board, and agent for this purpose | |
| CA2423827A1 (en) | Foam treatment of tissue products | |
| US10619306B2 (en) | Low density paper and paperboard with two-sided coating | |
| FI123421B (en) | Product that is applied to print and method of manufacturing a product that is applied to print | |
| SE1050851A1 (en) | A method for coating paper or cardboard | |
| US7387703B2 (en) | Method for manufacturing base paper for release paper | |
| EP2179089B1 (en) | Method and apparatus for treating a substrate | |
| JP2008231591A (en) | Method for producing coated paper, and coated paper | |
| JP2021155898A (en) | Base paper for release paper and release paper | |
| WO2010018302A1 (en) | A method for making printing paper | |
| JP3279648B2 (en) | Manufacturing method of cast coated paper | |
| JP3767693B2 (en) | Coated paper for web offset printing | |
| JPH04308298A (en) | Production of both-face cast coated paper | |
| JP2009030199A (en) | Papermaking machine, method for producing machine-glazed paper, and machine-glazed paper | |
| JP2009001938A (en) | Method for producing coated paper | |
| JP2011012357A (en) | Method for producing one-side glazed paper, and one-side glazed paper | |
| EP0401434A1 (en) | Improved creping adhesive formulation |