CN103201426A - Method for improving runnability of a wet paper web, use of a solution and paper - Google Patents

Method for improving runnability of a wet paper web, use of a solution and paper Download PDF

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Publication number
CN103201426A
CN103201426A CN2011800471926A CN201180047192A CN103201426A CN 103201426 A CN103201426 A CN 103201426A CN 2011800471926 A CN2011800471926 A CN 2011800471926A CN 201180047192 A CN201180047192 A CN 201180047192A CN 103201426 A CN103201426 A CN 103201426A
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China
Prior art keywords
anionic polymer
paper
wet web
polymer solution
solution
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CN2011800471926A
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CN103201426B (en
Inventor
克里斯蒂安·萨尔米宁
埃利亚斯·雷图莱宁
扬内·卡塔亚-阿霍
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Stora Enso Oyj
Kemira Oyj
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Stora Enso Oyj
Kemira Oyj
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Classifications

    • 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
    • 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
    • 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
    • D21H17/41—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups
    • D21H17/42—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups anionic
    • 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
    • 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
    • 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
    • D21H17/31—Gums
    • D21H17/32—Guar or other polygalactomannan gum
    • 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
    • D21H17/41—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups
    • D21H17/44—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups cationic
    • 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

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)

Abstract

The invention relates to a method for improving runnability of a wet paper web or the like. The method comprises adding to a stock of fibres a cationic polymer, forming a wet paper web from the stock of fibres, and applying an anionic polymer solution to the wet paper web. The invention relates also to a paper produced by using the method and to a use of a solution comprising an anionic polymer.

Description

Improve the method for the behavior in service of wet web, purposes and the paper of solution
According to the preamble of claims, the present invention relates to improve the method for the behavior in service of wet web, purposes and the paper of solution.
Background of invention
Produce paper economically and need the good behavior in service of paper machine.The paper machine behavior in service is usually by assessing with the proportional web breaks number of speed of production.In order to obtain good behavior in service, paper must move with low web breaks number in each subprocess of whole paper machine line well.In practice, commonly one of subprocess causes most web breaks, causes very poor gross efficiency.Have been noted that many runnability problems occur in when paper web still is in wet condition, especially in the process from the press section to the drying section.Thus, if obtain the high efficiency of whole paper production line, then the good operation performance of the beginning part of paper machine is favourable when paper is still wet.
Can improve the behavior in service of l Water Paper by the intensity that improves wet web.The known intensity that has many solutions to be used for improving wet web is joined slurry composition or web tension as the beating degree that improves paper pulp, the integral body in the change process.But many these solutions cause the character deterioration of the paper that finally makes simultaneously or significantly improve production cost.For example, the raising beating degree can improve curling, and influences the character of final paper unfriendly.
Traditional wet strength additives (it is used for improving the wet strength of dry final paper web) does not improve the intensity of wet web, that is, and and from the intensity of undried wet web.This is because wet strength additives required heating usually and solidifies (curing) before they show improved strength.
Make its dry before intensity be that the paper machine of the paper product kind (paper grades) of key factor has high efficiency, but their average speed of production may significantly be lower than their normal speed.If can improve the intensity of wet web, then can improve the speed of these paper machines.
Filler is used for papermaking with the cost that reduces paper and the optical property of improving paper as clay, calcium carbonate, calcium sulfate or talcum.Filler is added in the paper machine slurry (stock) before.For applied paper product kind, coating pigment (it comprises identical mineral) can enter paper by breaking portion, and paper-making process is got back in its recirculation.The content of filler and coating pigment records by the content of ashes measurement of carrying out at 525 ℃ of burn down slurry or pattern product usually.
Be used for body paper uncoated cultural paper and that be used for the cultural paper of coating and made by cork and hardwood, its content of ashes is generally 18-24%.Be used for having usually based on the body paper uncoated cultural paper and that be used for the cultural paper of coating of 100% cork the content of ashes of 10-17%.Prevent that the important limiting factor that filer content improves in the cultural paper from being the wet web behavior in service.
One object of the present invention is to minimize or even eliminates the shortcoming that exists in the prior art.
One object of the present invention is to provide a kind of effective and simple method of improving the intensity of wet web and analog.
One object of the present invention is to improve the filer content of paper to reduce the papermaking cost.
Employing has the method for the feature that proposes in the characteristic of independent claims hereinafter and these purposes of realization is set.
Typical method of the present invention for the behavior in service of improving wet web and analog comprises:
-in fibre stuff, add cation type polymer,
-by this fibre stuff form wet web and
-anionic polymer solution is applied to described wet web.
Typical paper of the present invention is that the method for the application of the invention makes.
Usually, comprise the solution of anionic polymer of dissolved form by described solution is applied to the behavior in service that paper web is used to improve wet web.
Find surprisingly now, when anionic polymer solution is applied to wet web when (it comprises the fiber of the surface charge with at least part of cationic) by (preferably by spray), the interaction between the fiber and the intensity of wet web improve.Do not wish to be bound by theory, suppose that the anionic polymer that applies is had the electron interaction absorption on the fiber surface of cationic charge or adheres to.Can interact to influence the raising of wet web strength by the molecular level between chemicals and the fiber.This can promote the intensity of the key that forms between the amount of fiber-fiber interaction and the fiber.Further infer that molecular level interacts between the fiber of raising, no matter be electrostatic property or chemical property, explained that the intensity of wet web improves, rather than formed covalent bond.Thus anionic polymer solution is applied to wet web to improve fiber interaction each other and tensile strength and/or the residual tensions of wet web.
Also observe, anionic polymer solution is applied to the filer content that wet web can improve paper.When the paper web wet strength after improving strain by employing the present invention or tension force, can use the high filler content in body paper, for the cultural paper body paper of the uncoated cultural paper that is made by cork and hardwood mixture and coating, corresponding to the content of ashes that for example surpasses 25%.Correspondingly, for based on the uncoated cultural paper of 100% cork and the cultural paper body paper of coating, can use the high filler content in body paper, this high filler content is corresponding to the content of ashes that surpasses 18%.The feasible content of ashes that also can improve other paper and cardboard kind of improvement aspect initial wet web strength and dry strength, for example for the newsprint kind, content of ashes is increased to 5-17%, and perhaps for SC and LWC body paper, content of ashes is increased to 8-14%.
The improvement of initial wet web strength also can be used for changing into more cheap mixture of raw material and is used for slurry.For example, less old corrugated container (OCC) and the paper more collected from family are for the manufacture of boxboard (test liner) or corrugated paper (fluting board) kind.That reclaims can improve above 15% based on the corrugated paper of fiber or the content of ashes of boxboard.
Utilizing the another kind of mode of the initial wet web strength of improving is the specific electric load that is reduced in the squeezer place, and this improves the dry strength of paper and reduces porosity.This can be of value to printability.
Anionic polymer solution can be applied to the wet fiber web, and can carry out described applying in any suitable manner, for example by spraying or coating.Can also by use film transfer (as film transfer to expelling belt), froth bed applies or apply anionic polymer solution from independent head box charging anionic polymer solution.Preferably apply anionic polymer solution by spraying.Having been found that provides many surprising advantages with the anionic polymer solution spraying to fiber web.The spraying of polymer solution does not influence the formation of paper web, thus the negative effect that will not note in final paper properties.On the other hand, having been noted that anionic polymer solution is better than in the reservation of web adds polymer solution in the slurry to.The consumption that this means anionic polymer can keep lower, and the loss of chemicals is minimized.Observe, when adding anionic polymer solution by spraying, this polymer evenly distributes in whole web.Between the surface of web and core segment, do not observe the difference of amount of polymers.
Preferably, anionic polymer being applied to wet web does not exert an influence to the density of final dried paper.This may show, applies anionic polymer and has improved the intensity of fiber-fiber key in the wet web, still may not increase the number of these keys.Also surprisingly, the spraying anionic polymer can improve the gas permeability of final dried paper, even on average improves 35%.
Anionic polymer solution is to comprise the solution that is dissolved in the anionic polymer in the solvent (being generally water).Anionic polymer solution can comprise the anionic polymer of dissolving and discrete form, as long as the amount of the anionic polymer of dissolving is enough to obtain required effect.According to one embodiment of the invention, be used for anionic polymer solution of the present invention and can not contain discrete polymer beads.Anionic polymer solution can comprise a kind of anionic polymer, and perhaps it can comprise the mixture of the anionic polymer of different dissolvings, for example the mixture of two or three anionic polymer.This embodiment means to wet web and applies anionic polymer solution that this solution comprises the mixture of different anionic polymers, for example the mixture of two or three anionic polymer.Comprise at anionic polymer solution under the situation of anionic polymer of multiple different dissolving, the anionic property of polymer (anionicity) can differ from one another.In other words, solution can comprise two or more anionic polymers with dissolving of different anions.
According to an embodiment, two or more anionic polymer solution can be applied on the wet web in proper order, preferably by spraying.This means the first anionic polymer solution is applied to wet web, be applied to wet web with second with optional anionic polymer solution thereafter subsequently.This applies preferably and is undertaken by spraying.
According to one embodiment of the invention, anionic polymer solution comprises the synthetic anionic polymer, as anion-polyacrylamide, or carboxymethyl cellulose (CMC) or other anionic heavy polymer, as anionic starch, anion guar gum or alginates.This anionic polymer solution is applied on the wet web.Carboxymethyl cellulose is by carboxymethyl being introduced the anionic polymer that cellulose chain makes, and the substitution value of cellulosic backbone and chain length influence its character.When substitution value surpassed 0.3, carboxymethyl cellulose became water miscible.
According to one embodiment of the invention, can also obtain anionic polymer solution by using amphiphilic polymers, as long as its net charge under the pH of paper-making process is negative.
Usually, the concentration of anionic polymer solution is＜1 weight %, is more typically 0.05-1 weight %, is more typically 0.2-0.6 weight % again.
According to one embodiment of the invention, the solution of synthetic anionic polymer is applied to wet web as anionic polymer solution.The synthetic anionic polymer can for example be selected from the polyacrylamide of hydrolysis wholly or in part, or comprising homopolymers or the copolymer of at least a anionic monomer, described anionic monomer is (methyl) acrylic acid, maleic acid, crotonic acid, itaconic acid, vinyl sulfonic acid, 2-acrylamide-2-methyl propane sulfonic acid, styrene sulfonic acid, vinyl phosphonate or glycolmethacrylate phosphate for example.Also can comprise uncharged monomer.The synthetic anionic polymer is the copolymer of acrylamide and one or more anionic copolymerization monomers preferably.Glyoxalated anion acrylamide copolymer also is applicable to the present invention.The synthetic anionic polymer can be sour form or salt form, and it can be straight chain, side chain or crosslinked slightly.
In this application, copolymer refers to such polymer, and it is made up of at least two kinds of different monomers.The number that forms the different monomers of copolymer can be greater than two kinds, for example three kinds or four kinds.
The weight average molecular weight of synthetic anionic polymer (MW) is generally〉100,000g/mol is more typically〉1,000,000g/mol.
According to one embodiment of the invention, anionic polymer solution applying on wet web can be that the synthetic anionic polymer solution of 0.3-0.5 weight % carries out by spraying concentration.Preferably, with the solution spraying of synthetic anionic polymer to wet web.Be applicable to that solution of the present invention can for example obtain with the solution that forms 0.3-0.5%w/w by the synthetic anionic polymer powder being dissolved in the water.Can also obtain solution by emulsion or the dispersion liquid of dissolving synthetic anionic polymer.
Can be preferably by spraying with anionic polymer with≤2g/m 2, common 0.05-1.5g/m 2, more generally≤1g/m 2, the most common 0.05-1g/m 2, preferred 0.05-0.5g/m 2, more preferably 0.05-0.3g/m 2Amount be applied to wet web.
The surface charge anionic normally that is used for natural unmodified fibers cellulose fiber, lignocellulose fiber or the wood fibre of papermaking.According to one embodiment of the invention, the surface charge of fiber is controlled as at least part of cationic, that is to say, fiber can have the surf zone of band cationic electric charge, even they can have the surf zone of other band anionic property electric charge.This can obtain in order to change their surface charge at least in part by at least a portion modification with fiber.For example, can be by in slurry, adding cation type polymer and modification partially or completely for the manufacture of the surface charge of the fiber of paper web.
The cation type polymer that adds in the slurry can be any cation type polymer that is suitable for being used in the slurry.The cation type polymer that adds in the fibre stuff can be selected from shitosan, the polysaccharide of cationization, as cationic starch or cation guar gum, or cation synthesising copolymer, as cation acrylamide copolymer, vinyl amine copolymer thing or polyamidoamines amine.Glyoxalated cationic-type polyacrylamide also can be as the cation type polymer among the present invention.Cation type polymer can also be to be described in for example US7, the cationic starch graft copolymer among 786, the 238B2.Add the cation type polymer cationic starch preferably in the slurry to.
When the cation type polymer in adding fibre stuff to was cationic acrylamide polymer, it can form by water-soluble ethylenically unsaturated monomers or by the grams of monomer blend that comprises cationic monomer.Cationic acrylamide polymer preferably has at least 1.0dl/g, the more preferably apparent characteristic viscosity of 1.5dl/g at least.
According to one embodiment of the invention, cation type polymer can be amphiphilic polymers, as long as its net charge is cationic under the pH of paper-making process.
Therein synthesizing cationic type polymer is added in the embodiment of the present invention in the slurry, preferably add to have 2%, in the thick slurry of the denseness of preferred 3-5%.Synthesizing cationic type polymer usually and preferably add in the thick slurry with the amount of 0.5-5kg/t.The synthesizing cationic type copolymer that adds in the slurry preferably has low charge density, and for example cationic acrylamide copolymer normally has under pH4＜the cationic acrylamide copolymer of low electric charge of the electric charge of 1.7meq/g, preferred＜1.2meq/g.
According to one embodiment of the invention, add the surface charge modification that makes fiber in the fibre stuff to by the polysaccharide (as cationic starch or cation guar gum) with cationization.The polysaccharide of cationization (as cationic starch or cation guar gum) preferably adds between paper pulp storage column and the short circulatory system in the thick slurry with denseness of 2-5% for example.Cationic starch can be any cationic starch that is applicable to papermaking, as potato, rice, corn, waxy corn, wheat, barley or tapioca.Amylopectin content〉75% starch is favourable.Usually, cationic starch comprises cation group, and as quaternary ammonium group, its substitution value (DS)---is illustrated in the number of the cation group on average every glucose unit in the starch---and is generally 0.01-0.20, preferred 0.01-0.06.Cationic starch has the electric charge of 0.06-1.04meq/g, preferred 0.06-0.35meq/g usually.Starch can be with 2-20kg/ ton paper pulp, the amount use of 7-12kg/ ton paper pulp usually.
When the aridity of paper web for＜50%, usually＜40%, more generally＜30%, anionic polymer solution can be applied to wet web during common 8-15%.When pulp suspension entered head box and enters paper machine thus, its dryness level was usually more than or equal to 0.3% and less than 2%.When web enters wet end (wire section) from head box, under weight-driven, from web, remove first and anhydrate.When further advancing in wet end along with paper, dewater by different vacuum units is auxiliary.After wet end, the aridity of paper is generally 20%.In the wet pressing process, the aridity of paper is increased to 40-50%.Preferably before the last region of no pressure of wet end, preferably carry out applying of anionic polymer solution by spraying.
According to one embodiment of the invention, before the press section of paper machine, anionic polymer solution is applied to wet web.
When making the paper product kind uncoated and coating do not contain wood pulp, the present invention is favourable for the intensity of improving wet web.The present invention also is suitable for improving the intensity of wet web when making the paper product kind that includes but not limited to super calendering (SC) paper, ultra-light-weight coating (ULWC) paper, light weight coating (LWC) paper and newsprint.The magazine paper of typical coating as LWC, comprises the bleached softwood slurry of the mechanical pulp of about 40-60 weight %, about 25-40 weight % and filler and/or the smears of about 20-35 weight %.The SC paper bag contains the mechanical pulp of about 70-90 weight % and the long fiber cellulose pulp of about 10-30%.Be particularly suited for handling according to method of the present invention for the manufacture of the paper web of inkjet printing with the record substrate.Paper web can comprise the combination from the fiber of palohierror or softwood trees or two kinds of fibers.Fiber can obtain by any suitable slurrying or the purification techniques that is generally used for papermaking, as hot machinery pulping (TMP), chemical-mechanical pulping (CMP), chemi thermo mechanical slurrying (CTMP), defibrillation, basic sulfatase method (kraft) slurrying, acid sulfite process and half chemical pulping.Paper web can only comprise pristine fibre or recycled fiber or the combination of the two.The weight of final paper web is 30-800g/m 2, be generally 30-600g/m 2, be more typically 50-500g/m 2, preferred 60-300g/m 2, more preferably 60-120g/m 2, more preferably 70-100g/m again 2
In some embodiments, paper web can comprise and is derived from non-wooden material, as the fiber of bamboo, bagasse, hemp, wheat straw or rice straw.
According to another embodiment, apply cationic or amphiphilic polymers solution before or after carry out anionic polymer solution applying to wet web.Such polymer is applied to wet web (preferably by spraying) in proper order can produce the remarkable improvement of doing with wet web strength.Anionic also can be pre-mixed before it preferably is applied to wet web by spraying with cation type polymer solution is in the same place.In this embodiment, it is not necessary that cation type polymer is added in the fibre stuff, but can implement.
For example, before or after anionic polymer solution is applied to wet web, before press section, apply the polymer solution of carboxymethyl cellulose (CMC), polyvinyl alcohol (PVA), modified polyvinylalcohol, guar gum and/or shitosan at wet web.Carboxymethyl cellulose, polyvinyl alcohol, modified polyvinylalcohol, guar gum or shitosan can once apply a kind of, or they two or three can apply in proper order.When web has when being higher than about 55% aridity, CMC and shitosan improve wet web intensity, and PVA also improves wet web strength under lower web dryness level.The molecular contact that the polyelectrolyte multilayer of anionic and cation type polymer improves fiber-fiber joint amasss, and has improved the intensity of dried paper thus.Have been noted that the layering of polymer now, for example two-layer, also can significantly improve the intensity of wet web.This shows that the layering of polymer can improve the interaction between the fiber under the wet condition.As if anionic polymer is sprayed to outermost layer can reduce the adhesion between the anion central roll on wet web and the paper machine, this also is rational.Generating in the process of polymer bilayer or multilayer by being sprayed on paper machine, the amount of the polymer of spraying is minimized.
According to another embodiment, before press section or drying section, one or more layers chemical solutions is applied to wet web.In fibre stuff, add cation type polymer and nonessential, but can implement.Cation type polymer as hereinbefore defined.As described in the present application, chemical solutions preferably is applied to wet web by spraying, but they can apply or apply from independent head box charging by coating, film transfer, froth bed.For example the chemical solutions that is applied to paper web by spraying can be the solution of carboxymethyl cellulose (CMC), polyvinyl alcohol (PVA), shitosan or guar gum.Guar gum is interpreted as galactomannans here.It is a kind of polysaccharide that comprises galactolipin and mannose.The skeleton of guar gum is β 1, and 4-connects the straight chain of mannose residue, per second mannose place 1 on it, and 6-is connected with galactose residue and forms short side chain.Guar gum can be applied to web with the form of natural guars, anion guar gum or cation guar gum.For example, natural guars, cation guar gum or anion guar gum can be applied to wet web, and described wet web forms under less than the situation of adding cation type polymer in slurry.In another example, natural guars or anion guar gum can be applied to wet web, and described wet web is by forming to the slurry that wherein is added with cation type polymer (as cation guar gum).
Test
Embodiment 1
Commercially availablely be used as raw material from the Finland paper mill from undried bleached softwood kraft slurry.Canadian Standard Freeness (CSF) value that records paper pulp according to standard SCAN-C21:65 is 500ml.
Be 60g/m by adopting the standard SCAN-CM64:00 formation grammes per square metre with recirculation plain boiled water preparation experiment chamber page 2Wet handmade paper (handsheet).For every page of paper, in the batching of adding to separately at 30 minutes cationic starch of T=97 ℃ of following boiling in the sheet former.The amount of the cationic starch that adds is 10kg/t(Raisamyl135 starch DS0.035, BASF).In contrast, do not use cationic starch.
To the handmade paper of moulding, described handmade paper sticks on the net with the anionic polymer solution spraying, and the below applies vacuum.Vacuum strengthens the infiltration in the l Water Paper page or leaf of anionic polymer solution in the spraying process.The concentration of the anionic polyacrylamide (from the Fennopol A8500R of Kemira Oyj) of spraying is the 0.3%w/w denseness, and at room temperature mixes whole night before spraying.Water spraying contrast page.
After spraying, with the handmade paper wet pressing.Under two kinds of different stress levels (50kPa and 350kPa), carry out wet pressing, to reach two kinds of different aridity of wet handmade paper.The sample that will wet cuts into width 20mm, sample length 100mm.Wet sample is stored under 7 ℃ temperature in the plastic bag with degree of keeping dry level under air tight condition.
The engineering properties of dried pattern product and l Water Paper sample is measured with the percussion mechanism (VTT Finland, FAST TENSILE TEST RIG IMPACT) that uses 1.0m/s speed.Percussion mechanism and method of testing are described in the following document: Kurki, M., Kouko, J., Kekko, P., Saari, T., Laboratory scale measurement procedure of paper machine wet web runnability:Part1, Paperi ja Puu, 86 (2004) 4; And Kouko, J., Salminen, K., Kurki, M., Laboratory scale measurement procedure of paper machine wet web runnability:Part2, Paperi ja Puu, 89 (2007) 7-8.
The result is presented among Fig. 1, shows that the applying method studied is to the influence of the initial wet intensity of paper.Use following abbreviation among Fig. 1:
The CS=cationic starch
The A-PAM=anionic polyacrylamide
Even with reference to it seems the most practical at present and embodiment preferred invention has been described, but it being understood that and the invention is not restricted to above-mentioned embodiment that the present invention also is intended to cover difference modification and the equivalent technical solutions in the claims scope.

Claims (24)

1. for the method for the behavior in service of improving wet web and analog, comprising:
-in fibre stuff, add cation type polymer,
-form wet web by described fibre stuff,
It is characterized in that,
Anionic polymer solution is applied to described wet web.
2. method according to claim 1 is characterized in that, applies anionic polymer solution at wet web, and described anionic polymer solution comprises the synthetic anionic polymer, as anion-polyacrylamide; Carboxymethyl cellulose (CMC); Anionic starch; Anion guar gum or alginates.
3. method according to claim 2 is characterized in that, the solution of synthetic anionic polymer is applied to described wet web as described anionic polymer solution.
4. method according to claim 3 is characterized in that, described synthetic anionic polymer is selected from the polyacrylamide of hydrolysis wholly or in part; Or comprising homopolymers or the copolymer of at least a anionic monomer, described anionic monomer is (methyl) acrylic acid, maleic acid, crotonic acid, itaconic acid, vinyl sulfonic acid, 2-acrylamide-2-methyl propane sulfonic acid, styrene sulfonic acid, vinyl phosphonate or glycolmethacrylate phosphate for example.
5. method according to claim 3 is characterized in that, described synthetic anionic polymer is the copolymer of acrylamide and one or more anionic copolymerization monomers.
6. method according to claim 3 is characterized in that, the weight average molecular weight of described synthetic anionic polymer (MW) is generally〉100,000g/mol is more typically〉1,000,000g/mol.
7. according to each described method in the aforementioned claim 1 to 6, it is characterized in that, with≤2g/m 2, common 0.05-1.5g/m 2, preferred 0.05-0.5g/m 2Amount described anionic polymer is applied to described wet web.
8. according to each described method in the aforementioned claim, it is characterized in that, described anionic polymer solution apply by spraying, by apply, by using film transfer, applying or by carrying out from the described anionic polymer solution of independent head box charging by froth bed.
9. method according to claim 8 is characterized in that, described anionic polymer solution on described wet web to apply by spraying concentration be that the synthetic anionic polymer solution of 0.3-0.5 weight % carries out.
10. according to each described method in the aforementioned claim, it is characterized in that, anionic polymer solution is applied to described wet web, and described anionic polymer solution comprises different anions type mixture of polymers, for example mixture of two or three anionic polymer.
11. method according to claim 1 is characterized in that, two or more anionic polymer solution is applied on the described wet web in proper order, preferably by spraying.
12. method according to claim 1 is characterized in that, when the aridity of described paper web for＜50%, when being preferably 8-15%, described anionic polymer solution is applied to described wet web.
13. method according to claim 1 is characterized in that, before the press section of paper machine described anionic polymer solution is applied to described wet web.
14. method according to claim 1 is characterized in that, before the last region of no pressure of described wet end described anionic polymer solution is applied to described wet web.
15. method according to claim 1 is characterized in that, the described cation type polymer that adds in the described fibre stuff is selected from shitosan; The polysaccharide of cationization is as cationic starch or cation guar gum; Or cation synthesising copolymer, as cation acrylamide copolymer, vinyl amine copolymer thing or polyamidoamines amine.
16. method according to claim 15 is characterized in that, synthesizing cationic type polymer is added to have〉in the thick slurry of 2% denseness, preferably add with the amount of 0.5-5kg/t.
17. according to claim 15 or 16 described methods, it is characterized in that, cationic acrylamide polymer is added in the fibre stuff, described cationic acrylamide polymer forms by water-soluble ethylenically unsaturated monomers or by the grams of monomer blend that comprises cationic monomer, and described cationic acrylamide polymer preferably has at least 1.0dl/g, the more preferably apparent characteristic viscosity of 1.5dl/g at least.
18. method according to claim 15 is characterized in that, with the polysaccharide of cationization, adds in the fibre stuff as cationic starch or cation guar gum.
19. method according to claim 18, it is characterized in that, amount with 2-20kg/ ton paper pulp, common 7-12kg/ ton paper pulp between paper pulp storage column and the short circulatory system is 0.01-0.20 with substitution value (DS), and the cationic starch of preferred 0.01-0.06 adds in the thick slurry that denseness is 2-5%.
20. according to each described method in the aforementioned claim, it is characterized in that, before or after being applied to described wet web, cationic or amphiphilic polymers solution carries out described anionic polymer solution to the applying of described wet web, preferably by spraying.
21. method according to claim 18, it is characterized in that, before or after described anionic polymer solution is applied to described wet web, before press section, apply the polymer solution of polyvinyl alcohol (PVA), modified polyvinylalcohol, guar gum and/or shitosan at described wet web.
22. require the paper that each described method makes in 1 to 21 by right to use.
23. comprising the solution of anionic polymer is used for by described solution is applied to the purposes that wet web improves the behavior in service of described wet web.
24. purposes according to claim 23, it is characterized in that, do not contain the uncoated paper of wood pulp when making, do not contain the coated paper of wood pulp, to improve when super calendering (SC) paper, ultra-light-weight coating (ULWC) paper, light weight coating (LWC) paper or newsprint the intensity of described wet web.
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