CN103140626A - 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 PDFInfo
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- CN103140626A CN103140626A CN2011800476775A CN201180047677A CN103140626A CN 103140626 A CN103140626 A CN 103140626A CN 2011800476775 A CN2011800476775 A CN 2011800476775A CN 201180047677 A CN201180047677 A CN 201180047677A CN 103140626 A CN103140626 A CN 103140626A
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- 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
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- 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
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- 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
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- 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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Abstract
The invention relates to a method for improving papermaking or board making process. The method comprises forming a fibre stock, and leading the fibre stock to a headbox and feeding it to a wire to form a wet fibrous web. A at least one polysaccharide having 1,4-beta-anomeric configuration in linkages between saccharide units of the polysaccharide backbone or the main polysaccharide backbone is applied to the fibre stock after machine chest or on the wet fibrous web. The invention relates also to paper made by the method and to the use of polysaccharide.
Description
Technical field
According to the claims preamble, the present invention relates to improve the method for the technique of making Paper or cardboard, the purposes of polysaccharide and paper.
Background technology
The economy manufacturing of paper and cardboard needs the good maneuverability of paper machine.The maneuverability of paper machine is estimated by the ratio of disconnected paper (web breaks) quantity and manufacturing speed usually.In order to reach good maneuverability, paper must be advanced well, and few in every sub-process disruption paper quantity of whole paper machine line.For example, reduce as far as possible the paper web vibration (fluttering) of drying section to avoid the appearance of disconnected paper.For fear of vibration and disconnected paper, paper web preferably should have residual tensions after good tensile strength and good strain.
The intensity of wet web is one of key factor during Paper or cardboard is made.The machine that the dry front intensity of manufacturing is the paper kind of key factor can have high efficiency, but their average manufacturing speed may be markedly inferior to their normal speed.If can increase the intensity of wet web, can promote the speed of these paper machines.
Common dry strength agent (dry strength agent) can not improve the intensity of wet web.An example of such dry strength agent is starch, and it has Isosorbide-5-Nitrae-α-end group heterogeneous structure.Typical starch comprises the amylose of linear Isosorbide-5-Nitrae-alpha-glucans polymer and has the amylopectin of branched structure.The skeleton of amylopectin is Isosorbide-5-Nitrae-alpha-glucans polymer, and side chain is connected to skeleton by 1,6-α-glycosidic bond.
Use filler in the manufacturing of Paper or cardboard, for example clay, calcium carbonate, calcium sulfate or talcum are to reduce costs and to improve the optical property of paper or cardboard.Filler adds slurry to the head box (headbox) of paper machine is front.For the paper kind through coating, coating pigment (it includes identical mineral) can partly enter in paper by broken (broke), and is recovered to the papermaking operation.The content of filler and coating pigment is generally by measuring in the content of ashes measurement of 525 ℃ of burning slurries or outturn.The body paper of uncoated fine paper and coating fine paper is made by cork and hardwood, and its content of ashes is generally 18～24%.The content of ashes of the body paper of the uncoated fine paper of 100% cork base and coating fine paper is generally 10～17%.Stoping the important inhibition factor that in fine paper, filer content increases is the paper strength performance of reduction and the paper web runnability of reduction.
An object of the present invention is to reduce as far as possible or even eliminate the defective that exists in prior art.
An object of the present invention is to provide the method for the tensile strength of a kind of simple and effective lifting paper web or analog.
An object of the present invention is to increase filer content in paper to reduce the papermaking cost.
Reach these purposes by the present invention, the present invention has subsequently the feature that the characteristic in independent claims provides.
The typical method of making the technique of Paper or cardboard according to improvement of the present invention comprises
-formation fibre stuff,
-described fibre stuff is introduced head box and described fibre stuff is fed to wet end (wire) to form the wet fiber paper web, reach
-at least a polysaccharide is administered in machine chest (machine chest) fibre stuff afterwards or is administered on the wet fiber paper web, has Isosorbide-5-Nitrae-β-end group heterogeneous structure in the connector of described polysaccharide between the saccharide unit of polysaccharide skeleton or main polysaccharide skeleton.
Use made according to the method for the present invention according to typical paper of the present invention.
According to having 1 in the connector between the saccharide unit of polysaccharide skeleton or main polysaccharide skeleton of the present invention, it is the filer content that increases paper or cardboard that the typical case of the polysaccharide of 4-β-end group heterogeneous structure uses, reduce Substance, and/or promote the runnability of wet web or wet paperboard paper web.
Unexpectedly find now, after the fiber in the polysaccharide that has Isosorbide-5-Nitrae-β-end group heterogeneous structure in the connector between saccharide unit and slurry or the fiber in wet web contacted, the tensile strength of wet paper or cardboard obviously promoted.Can promote by the wet web tensile strength that the present invention reaches to promote with the paper dry tensile strength makes the increase of filler content become possibility.When having promoted the residual tensions after the strain by application the present invention, for the uncoated fine paper of being made by cork and hardwood mixture and coating fine paper, can use the body paper (corresponding to content of ashes for for example over 25%) of high filler content.Relatively, for the body paper of the 100% uncoated fine paper of cork base and coating fine paper, can use the body paper of high filler content, described high filler content surpasses 18% corresponding to content of ashes.The lifting of tensile strength also can improve the content of ashes of other paper kind or cardboard kind, for example the content of ashes of newsprint can increase to and surpass 15%, or the content of ashes of coating machinery body paper can increase to and surpass 12%, or can increase to for the content of ashes of supercalendered paper (SC paper) and surpass 34%.Also can implement the lifting of tensile strength as slurry by using cheaper raw mix instead.For example, make boxboard (test liner) or corrugated board (fluting board grade) with less old corrugated paper (OCC) and more family expenses reclaimed waste paper.The fiber base corrugated board that reclaims or the content of ashes of boxboard can increase to and surpass 15%.
The filler that being used for of being applicable to that the present invention and its content can be increased, paper or cardboard made is clay, calcium carbonate, calcium sulfate, titanium dioxide or talcum or their mixture preferably.Usually, filler used is with the anionic property net charge.
According to an embodiment of the invention, the polysaccharide that has Isosorbide-5-Nitrae-β-end group heterogeneous structure in the connector between the saccharide unit of polysaccharide skeleton or main polysaccharide skeleton is selected from water-soluble cellulose derivative; Galactomannans is as guar gum or locust bean gum; Galactoglucomannan; Carboxymethyl cellulose, the glucan of xylan and replacement is as xyloglucan; The hydrocolloid that other is suitable is as tamarind gum; Shitosan; Chitin; Perhaps their derivative.According to one preferred embodiment, the polysaccharide that has Isosorbide-5-Nitrae-β-end group heterogeneous structure in the connector between saccharide unit is selected from water-soluble cellulose derivative; Galactomannans is as guar gum or locust bean gum; Galactoglucomannan; Carboxymethyl cellulose, the glucan of xylan and replacement is as xyloglucan; The hydrocolloid that other is suitable is as tamarind gum; Perhaps their derivative.According to another preferred embodiment, the polysaccharide that has Isosorbide-5-Nitrae-β-end group heterogeneous structure in the connector between the saccharide unit of polysaccharide skeleton or main polysaccharide skeleton is guar gum.Guar gum can be regarded as the carbohydrate polymer that comprises galactolipin and mannose structures unit in this article, and particularly every two mannose unit comprise 1 galactose units.Skeleton is the mannose residue straight chain of β Isosorbide-5-Nitrae-connection, and wherein galactose residue is to be connected in form and the described mannose residue 1 on each second mannose, and 6-connects, thereby forms short side side chain.Guar gum obtains with the form of cluster bean extract usually.Guar gum can use or use with the form of cationization or anionization by native form.
According to an embodiment of the invention, using CATION reinforcing agent (strength agent) in described fibre stuff and/or after on described wet fiber paper web, be administered to the guar gum of anionization in described fibre stuff or on described wet fiber paper web.The CATION reinforcing agent can be polyacrylamide, polyvinyl acid amides, daiamid (polyamidoamine), chloropropylene oxide, starch, cation guar gum or their derivative of cationic or both sexes.For example, the form that can spray is administered to the wet reinforcing agent of CATION on described wet fiber paper web, uses afterwards the guar gum of anionization with the form of spraying.More typically, the wet reinforcing agent of CATION is administered among described fibre stuff, is administered on described wet fiber paper web with the form of the spraying guar gum with anionization afterwards.The guar gum of anionization has usually＜charge density of 2meq/g.
According to another implementation of the invention, the polysaccharide that has Isosorbide-5-Nitrae-β-end group heterogeneous structure in the connector between the saccharide unit of polysaccharide skeleton or main polysaccharide skeleton is carboxymethyl cellulose, CMC.In this article, carboxymethyl cellulose is interpreted as the anionic property polymer, and it prepares by carboxymethyl group is incorporated into cellulose chain, and the chain length of substitution value and cellulose skeleton affects the performance of CMC, and is for example water-soluble.When substitution value surpassed 0.3, carboxymethyl cellulose became water-soluble.
According to another implementation of the invention, has the polysaccharide of Isosorbide-5-Nitrae-β-end group heterogeneous structure in the connector between the saccharide unit of polysaccharide skeleton or main polysaccharide skeleton for having the polysaccharide of high polymerization degree (DP).Namely refer to comprise the polysaccharide of 500 anhydroglucose unit.Size exclusion chromatography (SEC) SEC can be used for the mensuration of the degree of polymerization.Observed when using described polysaccharide, the tensile strength of described wet paper or cardboard further promotes.
The polysaccharide that has Isosorbide-5-Nitrae-β-end group heterogeneous structure for the connector between the saccharide unit of polysaccharide skeleton or main polysaccharide skeleton of the present invention is water miscible.If use the derivative of described polysaccharide, described derivative is also water miscible.The viscosity of described polysaccharide solution (Bu Shi)＜5000mPas, preferred＜2000mPas.Can be with solution dilution to reach required concentration.
In any appropriate manner the polysaccharide that has Isosorbide-5-Nitrae-β-end group heterogeneous structure in the connector between the saccharide unit form with solution is administered on described wet fiber paper web.Preferably, be dissolved into by the described polysaccharide with powder type and obtain described solution in solvent, described solvent is generally water.Preferably, described polysaccharide solution does not contain discrete polyoses grain.Described polysaccharide solution can comprise a kind of polysaccharide or can comprise the not mixture of polysaccharide of the same race, for example mixture of two or three polysaccharide.Therefore, according to an embodiment, the mixture of polysaccharide of the same race not can be administered in the described fibre stuff after machine chest or be administered on described wet fiber paper web.Typically, the concentration of polysaccharide described in described polysaccharide solution is＜60 % by weight, more is typically 0.02～5 % by weight, is preferably 0.05～3 % by weight, more preferably 0.05～2 % by weight.The concentration that has the polysaccharide of high polymerization degree (DP) in solution can even be＜1 % by weight more to be typically 0.05～1 % by weight, even more is typically 0.2～0.6 % by weight.
According to an embodiment of the invention, described polysaccharide is administered in the described fibre stuff between the outlet (outlet) of last pump before paper machine or board machine head box and paper machine or board machine head box.Preferably, described polysaccharide is added in the described slurry that is positioned as close to described head box, if perhaps can guarantee the abundant mixing of described slurry, described polysaccharide directly can be added in described head box.Keep the absorption of expansion form and described the above polysaccharide of fiber surface to reduce because described polysaccharide holdup time in described slurry is short, thereby near the interpolation of described polysaccharide described head box promoted being connected of described fiber and described polysaccharide.In addition, when adding to described polysaccharide in described slurry after pump in the end, the Risk Reduction that the destruction of the staple fibre that is caused by described polysaccharide and described polysaccharide skeleton divide due to shearing force is to minimum level.Therefore, the activity keeping of described polysaccharide can reduce its consumption or obtain higher tensile strength value by the use same amount at high level.
According to an embodiment of the invention, described polysaccharide is administered in described fibre stuff together with retention agent (retention agent) or filter aid (drainage agent).Usually described polysaccharide and described retention agent are added near the described fibre stuff described head box, for example the dosing by mechanical filter.Described retention agent or described filter aid can be any suitable retention agent.Described retention agent is selected from anion or cationic polyacrylamide, polyvinylamine, polymine, cationic starch, bentonite or silica.Particularly described retention agent can be anion or cationic polyacrylamide, polyvinylamine or polymine.Form that can independent solution or add described retention agent and described polysaccharide with the form of the single solution that comprises described retention agent and described polysaccharide.The polymer retention agent provides with dry polymer, and its consumption can be 50～1000g/t, is preferably 100～600g/t, and described polysaccharide provides with dry polymer, and its consumption can be preferably 200～4000g/t, is preferably 500～2500g/t.
According to another embodiment of the present invention, be administered in described fibre stuff together with the dry strength agent of described polysaccharide and anionic property, cationic or both sexes.Described dry strength agent choosing is the following group that forms freely: the polyacrylamide of polyacrylamide, glyoxalated, polyvinylamine, polyamine epichlorohydrin copolymer (PAAE), starch derivatives and carboxymethyl cellulose.Described dry strength agent provides with active material, and amount of application can be 0.1～4kg/t paper, particularly 0.2～2kg/t paper.
According to a preferred embodiment of the present invention, described polysaccharide is administered on the wet fiber paper web between the last nip of described head box and press section.According to a preferred embodiment of the present invention, the mode by spraying, coating, film transfer or coating froth bed (foam layer application) is administered to described polysaccharide on the wet fiber paper web.Can be by with film transfer, described polysaccharide being used in the charging that polysaccharide is administered to expelling belt or the polysaccharide solution by independent head box.Preferably, carry out using of described polysaccharide by spraying.Found that described polysaccharide provides a lot of beyond thought benefits to the spraying on described fibrous web.The spraying of described polysaccharide solution does not affect the formation of paper web, does not find negative effect in final paper performance thus.On the other hand, notice that also described polysaccharide gets a promotion to the reservation power of described paper web.The use amount that this means described polysaccharide can remain on lower level, and chemical loss can be reduced to minimum level.Observed when applying described polysaccharide solution by spraying, described polysaccharide is uniformly distributed in whole paper web.The amount of not observing described polysaccharide has significant difference between the surface of described paper web and core.
Preferably, by spraying, described polysaccharide is applied on described wet web.Found that when being coated with by spraying, the amount of the polysaccharide that applies can be lowered, and still obtained the lifting of paper web tensile strength properties.For example, can be dissolved in the water by the polysaccharide with powder type forms 0.2～20 % by weight, and the solution of preferred 0.3～3 % by weight obtains the polysaccharide solution that is applicable to spray.
According to another embodiment, use described polysaccharide by coating froth bed or foam coating (foam coating).Can be coated with by foam and use described polysaccharide, wherein said polysaccharide is administered on described wet web with the form of foam, and the air content of described foam is 60～95%.
No matter the application process of described polysaccharide, according to≤0.1～10kg/ (ton paper), the consumption of preferred 0.3～3kg/ (ton paper) is used described polysaccharide.When the described polysaccharide of spray application, can be according to≤2g/m
2, typical case 0.05～1.5g/m
2, more typical≤1g/m
2, the most typical 0.05～1g/m
2, preferred 0.05～0.5g/m
2, more preferably 0.05～0.3g/m
2Consumption described polysaccharide is administered on described wet web.
According to an embodiment of the invention, when the aridity of described paper web is＜50%, typical case＜40%, more typical＜30% in the time of preferred 8～15%, is administered to described polysaccharide solution on described wet web.When pulp suspension entered described head box and enters described paper machine thus, the aridity of described pulp suspension was usually more than or equal to 0.3% and less than 2%.When described paper web enters described wet end (wire section) from described head box, by the dehydration for the first time of the described paper web of weight-driven.Advance in wet end due to paper farther, thereby promote dehydration by different vacuum plants.After described wet end, the aridity of described paper is generally 14～22%.Aridity at paper described in the wet pressing process is increased to 40～55%.Using preferably of described polysaccharide solution preferably implemented by spraying before last vacuum area of described wet end.
According to an embodiment of the invention, can two kinds or more kinds of polysaccharide be administered on described wet fiber paper web one by one by spraying.Thereby can easily be administered to a plurality of different polysaccharide layers over each other to obtain desired properties.
According to a kind of embodiment, apply described polysaccharide before or after anionic property or cation property copolymer solution are applied on described wet web.Before the press section of paper machine, described anionic property polymer is being administered on described wet web.For example, using of anionic property or cation property copolymer solution can be carried out before or after described polysaccharide is applied to described wet web.This polysaccharide and one or more polymer preferably act on by spraying the remarkable lifting that using in turn on described wet web can cause dried paper web and wet web strength.Anionic property also can preferably be in the same place by spray application premixed before wet web with cation property copolymer solution.
The present invention is conducive to promote the intensity of wet web when manufacturing does not contain the uncoated of wood pulp or coated paper kind.The present invention also is applicable to promote by the intensity that promotes wet web the maneuverability of wet web or wet paperboard width when making the paper kind, described paper kind includes but not limited to not contain the uncoated paper of wood pulp, the coated paper that does not contain wood pulp, super calendering (SC) paper, ultralight amount coating (ULWC) paper, light coating (LWC) paper or newsprint.Especially, the paper web for the manufacture of the ink jet printing base plate is suitable for processing with the method according to this invention.Described paper web comprises the fiber that derives from palohierror or softwood trees or the combination of two kinds of fibers.described fiber can be by in any suitable papermaking, slurrying (pulping) or defibrination (refining) technology of employing obtain usually, for example thermomechanical slurrying (thermomechanical pulping, TMP), chemical-mechanical pulping (chemimechanical, CMP), chemistry thermomechanical slurrying (chemithermomechanicalpulping, CTMP), ground wood pulp slurrying, basic sulfatase (brown paper) slurrying, acid accumulator sulfite slurrying (acid sulphite pulping) and semichemical pulping (semichemical pulping).Described paper web can only comprise fibrillation or recycled fiber or both combinations.The weight of final paper web is 30～800g/m
2, be typically 30～600g/m
2, more be typically 50～500g/m
2, be preferably 60～300g/m
2, 60～120g/m more preferably
2, 70～100g/m even more preferably
2
In some embodiments, described paper web can comprise the fiber from non-wood material, for example bamboo, bagasse, hemp, wheat or straw.
According to an embodiment of the invention, increase the filer content of described paper or cardboard, thereby make the content of ashes in wet web or wet paperboard paper web for the uncoated paper that does not contain wood pulp be〉25%, for the coated paper body paper that does not contain wood pulp be〉25%, for super calendering (SC) paper be〉34%, for the coating machinery body paper be〉13%, for newsprint, corrugated board or boxboard be 15%, by measuring described content of ashes 525 ℃ of described slurry sample of completing combustion.
Before press section or drying section, one or more layers chemical solution is being administered on described wet web.It is not enforceable in described fibre stuff that cation property copolymer is added to, but described applying can be carried out.Described chemical solution preferred as described in the present application pass through spray application to wet web, but also can use chemical solution by coating, film transfer, coating froth bed or from head box charging independently.Use (for example by spraying) can be carboxymethyl cellulose (CMC), polyvinyl alcohol (PVA), shitosan or guar gum to the described chemical solution of described paper web solution.Guar gum is interpreted as galactomannans herein.Described galactomannans is the polysaccharide that comprises galactolipin and mannose.The skeleton of described guar gum is the mannose residue straight chain of β Isosorbide-5-Nitrae-connection, and wherein galactose residue is to be connected in form and the described mannose residue 1 on each second mannose, and 6-connects, thereby forms the side side chain.Guar gum is administered to described paper web with the form of natural guar gum (native guar gum), anionic property guar gum or cationic guar gum.For example, the guar gum of natural, cationic or anionic property can be administered to described wet web, wherein said wet web is in the situation that do not add cationic polymer in described slurry and form.In another example, the guar gum of natural or anionic property can be administered to wet web, described wet web is that for example the slurry of cationic guar gum is formed by having added cation property copolymer.
Experiment
Embodiment 1
Obtain the former pine paper pulp of chlorine-free bleaching from the pulp mill of Finland.With described paper pulp in pulp mill's defibrination and dehydration.Described paper pulp to advance airtight Polythene Bag from undried packaged, is then remained on-18 ℃ until be used for test.Measure according to ISO5267-1, described paper pulp dehydration and freezing after Xiao Lei (SP) value be 20.Before page was got the raw materials ready 30～90 minutes, guar gum (Sigma G4129), carboxymethyl cellulose (DS0.7 with natural dissolving, DP140) and shitosan (Mw400,000g/mol) be applied in high consistency pulp with the form of 0.5 % by weight solution.
According to the standby wet handmade paper of SCAN-C26:76 metric system and dried handmade paper.The grammes per square metre of handmade paper is 60g/m
2To be placed in sealing bag through the described handmade paper of wet pressing and be stored in refrigerating chamber constant with the humidity that keeps page before measurement.
For the spraying of chemicals in the laboratory, formed wet handmade paper is placed on wet end and uses vacuum adhering.The use of vacuum has also improved the permeability that in the spraying process, chemicals enters described paper.Described experimental provision comprises vacuum tank, has mobile example slide plate (moving sample sledge with wire) and the spray equipment of wet end.Adjust the amount of described spraying chemicals by the speed of described mobile example slide plate, and described spray equipment remains unchanged and immobilization.The spraying after with 350kPa with described sample wet pressing 5 minutes and with 50kPa with described sample wet pressing 2 minutes.For the test page, higher pressure produces aridity preferably.Chemicals concentration in the spraying test process is 0.5%.
Measure
Measure tensile strength according to ISO1924-2:2008.Measure the aridity of described outturn by using Mettler Toledo HR73 infrared-ray dryer.
Result
Fig. 1 shows for adding in high consistency pulp or spraying to laboratory test (embodiment 1) result of the guar gum on wet web.Can find out, the intensity for wet web is favourable at the after-applied guar gum of paper machine process rather than during guar gum is applied to high consistency pulp.
Fig. 2 shows for the laboratory test that spray to CMC, shitosan and guar gum on wet web (embodiment 1) result.Can find out the not impact of homopolysaccharide on wet web strength.Guar gum is the most effective.Shitosan and carboxymethyl cellulose (CMC) have also promoted wet web strength.Adopt water spray or without the handmade paper of any spraying as a comparison.
Embodiment 2
Buy the paper pulp that comprises 70% hardwood and 30% cork from the pulp mill of Finland, the SR value of wherein said hardwood is 24, and the SR value of described cork is 28.Measure the SR value according to ISO5267-1.Use the calcium carbonate of precipitation as filler.Filler is added in described paper pulp, the aimed concn of interpolation be filer content reach final paper web 20%.Keeping chemicals is that dosage is the Fennopol K3400R (Kemira Oyj) of 200g/t, and it is added in described head box incoming flow.Use the wet end of small-sized fourdrinier machine to test.The grammes per square metre of the paper web that forms is 70g/m
2On wet end, chemicals is being sprayed on wet web.After spraying with 350kPa with described sample wet pressing 5 minutes and with 50kPa with described sample wet pressing 2 minutes.
Measure
Measure tensile strength according to ISO1924-2:2008.Measure the aridity of described outturn by using Mettler Toledo HR73 infrared-ray dryer.
Result
Fig. 3 shows half pilot scale (embodiment 2) tensile strength result through the guar gum of spraying, and Fig. 4 shows through the anti-energy absorption of half pilot scale (embodiment 2) of the guar gum of spraying.Can be observed in the accompanying drawings guar gum wet web spraying dosage to the impact of wet web strength.Spraying dosage is 0.1g/m
2(1.4kg/t), 0.3g/m
2(4.2kg/t) and 0.5g/m
2(7.1kg/t).0.1g/m
2And 0.3g/m
2Dosage promoted solids content after wet web tensile strength and wet pressing.0.5g/m
2Dosage further promoted intensity, but reduced the solids content in the wet pressing.Therefore, under described experimental condition, optimal dose can be 0.1g/m at least
2And 0.5g/m
2Between.Paper web needs tensile strength to keep enough tension force to allow the high speed of service at drying section of paper machine.If the tension force of described paper web is not high enough, drying section blanket (dryer fabric) and the page vibration of not enclosing of described page can cause disconnected paper, and described disconnected paper is owing to the wind-force effect that causes at a high speed.If paper web has defective for example broken hole, rotten slime spots point, sticky particle or local lower quantitatively the lifting of an anti-energy absorption T.E.A. helps avoid disconnected paper, this be because higher strength decreased paper web come from defective locations and the risk of tearing.
Embodiment 3
For fine paper, the test batching is cork and hardwood kraft paper pulp, and it comprises scalenohedron (scalenohedric) winnofil (PCC) filler of 40 % by weight.Additionally use PCC in some tests.In under the stirring of magnetic stirring apparatus, chemicals being applied to batching before the page batching.For paper machine retention system (paper machine retention system), the charging time that cationic polyacrylamide (C-PAM) keeps auxiliary agent and guar gum is typical, sees Table 1.With the ratio premixed of powder type according to 1:1, then water is dissolved to guar gum and C-PAM the concentration of 0.5 % by weight with guar gum and C-PAM, obtains guar gum that ultimate density is 0.25 % by weight and the C-PAM of 0.25 % by weight.
The chemicals that uses in described experiment is: cationic farina (DS0.035), guar gum (Sigma G4129) and cationic polyacrylamide, C-PAM, Fennopol K3400R (Kemira Oyj).Except starch cook being become the solution of 1 % by weight, whole chemicals are dissolved into the solution of 0.5 % by weight.
Use Rapid according to ISO5269-2:2004
Semi-automatic sheet forming apparatus prepares 80g/m
2Quantitative handmade paper.Measure content of ashes according to ISO1762:2001.
With the wet pressing of l Water Paper page, but the squeezing time is for carrying out 1 minute under 2 bar pressures of each two-layer MARKER paper (plotters) up and down according to ISO5269-1:2005.In test D and E, described wet pressing is for to carry out under the pressure of 4 bar 2 minutes.Carrying out anti-of wet web with dry ingredients after wet pressing measures.
According to
Method will be done the handmade paper vacuumize of anti-.Measure tensile index according to ISO1924-2:2008.Result can see Table 1.
The wet web tensile index of the different handmade papers of table 1 and dried tensile index result
Can find out from described result, A compares with test, and the wet web tensile index of test B promotes to some extent; Content of ashes also increases to some extent, and dried tensile index reduces.Compare with testing A, the guar gum of test C and the blend of C-PAM obtain the wet web tensile strength close with test A, but remarkable higher content of ashes.In test E, the paper pulp that comprises high filler uses cationic starch as reinforcing agent.D compares with test, and starch has reduced wet web strength.
Although with reference to seeming at present the most effective and preferred embodiment describing the present invention, be to be understood that to the invention is not restricted to above-mentioned embodiment, the present invention also is intended to cover different variants and the equivalent technical solutions in the scope that falls within claims.
Claims (23)
1. improve the method for the technique of making Paper or cardboard, it comprises
-formation fibre stuff,
-described fibre stuff is introduced head box and described fibre stuff is fed to wet end with formation wet fiber paper web,
It is characterized in that the polysaccharide that will have Isosorbide-5-Nitrae-β-end group heterogeneous structure at least a connector between the saccharide unit of polysaccharide skeleton or main polysaccharide skeleton is administered in machine chest described fibre stuff afterwards or is administered on described wet fiber paper web.
2. method according to claim 1, is characterized in that described polysaccharide is selected from water-soluble cellulose derivative; Galactomannans is as guar gum or locust bean gum; Galactoglucomannan; Carboxymethyl cellulose, the glucan of xylan and replacement is as xyloglucan; The hydrocolloid that other is suitable is as tamarind gum; Shitosan; Chitin; Perhaps their derivative.
3. method according to claim 1 and 2, is characterized in that using described polysaccharide with the form of solution.
4. method according to claim 1 and 2, the concentration that it is characterized in that polysaccharide described in described polysaccharide solution is＜60 % by weight, more is typically 0.02～5 % by weight, is preferably 0.05～3 % by weight, more preferably 0.05～2 % by weight.
5. the described method of any one according to claim 1 to 4, is characterized in that the mixture of different polysaccharide is administered in machine chest described fibre stuff afterwards or is administered on described wet fiber paper web.
6. method according to claim 1, the polysaccharide that it is characterized in that having in described at least a connector between the saccharide unit of polysaccharide skeleton or main polysaccharide skeleton Isosorbide-5-Nitrae-β-end group heterogeneous structure is guar gum.
7. method according to claim 1, is characterized in that having in described at least a connector between the saccharide unit of polysaccharide skeleton or main polysaccharide skeleton the polysaccharide of Isosorbide-5-Nitrae-β-end group heterogeneous structure for having the polysaccharide of high polymerization degree (DP).
8. method according to claim 1, is characterized in that according to≤0.1～10kg/ (ton paper), the consumption of preferred 0.3～3kg/ (ton paper) is used described polysaccharide.
9. according to the described method of aforementioned arbitrary claim, it is characterized in that described polysaccharide is administered in described fibre stuff between the outlet of last pump before the paper machine head box and paper machine head box.
10. method according to claim 9, is characterized in that described polysaccharide is administered in described fibre stuff together with retention agent or filter aid.
11. method according to claim 10, it is characterized in that described retention agent is selected from anion or cationic polyacrylamide, polyvinylamine, polymine, cationic starch, bentonite or silica, especially be selected from anion or cationic polyacrylamide, polyvinylamine or polymine.
12. according to claim 10 or 11 described methods is characterized in that applying described polysaccharide and described retention agent with the form of single solution.
13. the described method of any one according to claim 1 to 8 is characterized in that described polysaccharide is administered on the described wet fiber paper web between the last nip of described head box and described press section.
14. method according to claim 13 is characterized in that by the mode of spraying, coating, film transfer or coating froth bed, described polysaccharide being administered on described fibrous web.
15. method according to claim 14 is characterized in that the concentration of described solution is 0.2～20 % by weight by the described polysaccharide of spray application solution form, is preferably 0.3～3 % by weight.
16. according to claim 14 or 15 described methods is characterized in that by spraying according to≤2g/m
2, the most typical 0.05～1g/m
2, preferred 0.05～0.5g/m
2Consumption described polysaccharide is administered on described wet web.
17. method according to claim 14 is characterized in that being coated with by foam and uses described polysaccharide, wherein said polysaccharide is used take air content as 60～95% form of foam.
18. according to claim 14 to the described method of any one in 17, it is characterized in that the aridity when described paper web is＜50%, in the time of preferred 8～15%, described polysaccharide solution be administered on described wet web.
19. use the Paper or cardboard that according to claim 1 to 18, the described method of any one is made.
20. have the application of polysaccharide in the maneuverability of the filer content that increases described paper or described cardboard, reduction Substance and/or lifting wet web or wet paperboard paper web of Isosorbide-5-Nitrae-β-end group heterogeneous structure in the connector between the saccharide unit of polysaccharide skeleton or main polysaccharide skeleton.
21. application according to claim 20, the described filler that it is characterized in that increasing content is clay, calcium carbonate, calcium sulfate, titanium dioxide or talcum or their mixture.
22. application according to claim 20, it is characterized in that not containing the uncoated paper of wood pulp when making, do not contain the coated paper of wood pulp, when super calendering (SC) paper, the coating of ultralight amount (ULWC) paper, light coating (LWC) paper or newsprint, promote the maneuverability of wet web or wet paperboard width by the intensity that promotes wet web or wet paperboard width.
23. application according to claim 20 it is characterized in that increasing the filer content of described paper or described cardboard, thereby the content of ashes of described wet web or described wet paperboard paper web is
-for the uncoated paper that does not contain wood pulp be 25%,
-for the coated paper body paper that does not contain wood pulp be 25%,
-for super calendering (SC) paper be 34%,
-for the coating machinery body paper be 13%,
-for newsprint, corrugated board or boxboard be 15%,
By measuring described content of ashes 525 ℃ of described slurry sample of burning.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US38865810P | 2010-10-01 | 2010-10-01 | |
| FI20106021A FI125713B (en) | 2010-10-01 | 2010-10-01 | A method for improving the runnability of a wet paper web and paper |
| US61/388,658 | 2010-10-01 | ||
| FI20106021 | 2010-10-01 | ||
| PCT/FI2011/050843 WO2012042116A1 (en) | 2010-10-01 | 2011-09-30 | Method for improving papermaking or board making process, use of a polysaccharide and paper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103140626A true CN103140626A (en) | 2013-06-05 |
Family
ID=43064183
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011800476775A Pending CN103140626A (en) | 2010-10-01 | 2011-09-30 | Method for improving runnability of a wet paper web, use of a solution and paper |
| CN201180047192.6A Active CN103201426B (en) | 2010-10-01 | 2011-09-30 | Improve the method for the behavior in service of wet web, purposes and the paper of solution |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201180047192.6A Active CN103201426B (en) | 2010-10-01 | 2011-09-30 | Improve the method for the behavior in service of wet web, purposes and the paper of solution |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US20130299109A1 (en) |
| EP (2) | EP2622132B1 (en) |
| CN (2) | CN103140626A (en) |
| BR (2) | BR112013007244A2 (en) |
| CA (1) | CA2813148C (en) |
| ES (2) | ES2791997T3 (en) |
| FI (1) | FI125713B (en) |
| PT (1) | PT2622132T (en) |
| WO (2) | WO2012042116A1 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP2622132B1 (en) | 2018-04-04 |
| BR112013007244A2 (en) | 2016-06-14 |
| US20130299109A1 (en) | 2013-11-14 |
| FI20106021A (en) | 2012-04-02 |
| EP2622131B1 (en) | 2020-02-26 |
| EP2622131A1 (en) | 2013-08-07 |
| WO2012042115A1 (en) | 2012-04-05 |
| PT2622132T (en) | 2018-07-03 |
| BR112013007876A2 (en) | 2019-08-27 |
| FI125713B (en) | 2016-01-15 |
| EP2622132A1 (en) | 2013-08-07 |
| CA2813148A1 (en) | 2012-04-05 |
| FI20106021A0 (en) | 2010-10-01 |
| WO2012042116A1 (en) | 2012-04-05 |
| BR112013007876B1 (en) | 2020-12-29 |
| CA2813148C (en) | 2018-02-06 |
| ES2674881T3 (en) | 2018-07-04 |
| FI20106021L (en) | 2012-04-02 |
| CN103201426B (en) | 2016-05-11 |
| CN103201426A (en) | 2013-07-10 |
| ES2791997T3 (en) | 2020-11-06 |
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