EP2622131B1 - Method for improving papermaking or board making process, use of a polysaccharide and paper - Google Patents
Method for improving papermaking or board making process, use of a polysaccharide and paper Download PDFInfo
- Publication number
- EP2622131B1 EP2622131B1 EP11770475.9A EP11770475A EP2622131B1 EP 2622131 B1 EP2622131 B1 EP 2622131B1 EP 11770475 A EP11770475 A EP 11770475A EP 2622131 B1 EP2622131 B1 EP 2622131B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- paper
- polysaccharide
- web
- wet
- applying
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 229920001282 polysaccharide Polymers 0.000 title claims description 87
- 239000005017 polysaccharide Substances 0.000 title claims description 86
- 150000004676 glycans Chemical class 0.000 title claims description 30
- 238000000034 method Methods 0.000 title claims description 29
- 239000000123 paper Substances 0.000 claims description 126
- 150000004804 polysaccharides Polymers 0.000 claims description 86
- 239000000835 fiber Substances 0.000 claims description 30
- 238000005507 spraying Methods 0.000 claims description 29
- 125000002091 cationic group Chemical group 0.000 claims description 21
- 239000000945 filler Substances 0.000 claims description 20
- 239000003795 chemical substances by application Substances 0.000 claims description 19
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 16
- 125000000129 anionic group Chemical group 0.000 claims description 15
- 230000014759 maintenance of location Effects 0.000 claims description 15
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 14
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 14
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 14
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 11
- 150000001720 carbohydrates Chemical group 0.000 claims description 10
- 229920002472 Starch Polymers 0.000 claims description 9
- 239000006260 foam Substances 0.000 claims description 9
- 229920002401 polyacrylamide Polymers 0.000 claims description 9
- 235000019698 starch Nutrition 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 claims description 8
- 238000000576 coating method Methods 0.000 claims description 8
- 239000008107 starch Substances 0.000 claims description 8
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 6
- -1 polyvinylamine Polymers 0.000 claims description 6
- 229920002873 Polyethylenimine Polymers 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 4
- 238000003490 calendering Methods 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 3
- 239000001175 calcium sulphate Substances 0.000 claims description 3
- 235000011132 calcium sulphate Nutrition 0.000 claims description 3
- 239000004927 clay Substances 0.000 claims description 3
- 229910052570 clay Inorganic materials 0.000 claims description 3
- 239000000454 talc Substances 0.000 claims description 3
- 229910052623 talc Inorganic materials 0.000 claims description 3
- 239000000440 bentonite Substances 0.000 claims description 2
- 229910000278 bentonite Inorganic materials 0.000 claims description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 2
- TWNIBLMWSKIRAT-VFUOTHLCSA-N levoglucosan Chemical group O[C@@H]1[C@@H](O)[C@H](O)[C@H]2CO[C@@H]1O2 TWNIBLMWSKIRAT-VFUOTHLCSA-N 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 239000004408 titanium dioxide Substances 0.000 claims description 2
- 229920002907 Guar gum Polymers 0.000 description 33
- 239000000665 guar gum Substances 0.000 description 33
- 235000010417 guar gum Nutrition 0.000 description 33
- 229960002154 guar gum Drugs 0.000 description 33
- 238000012360 testing method Methods 0.000 description 19
- 239000000126 substance Substances 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 238000003825 pressing Methods 0.000 description 7
- 238000004537 pulping Methods 0.000 description 7
- 239000011122 softwood Substances 0.000 description 7
- 229920006317 cationic polymer Polymers 0.000 description 6
- 229920001661 Chitosan Polymers 0.000 description 5
- WQZGKKKJIJFFOK-PHYPRBDBSA-N alpha-D-galactose Chemical compound OC[C@H]1O[C@H](O)[C@H](O)[C@@H](O)[C@H]1O WQZGKKKJIJFFOK-PHYPRBDBSA-N 0.000 description 5
- 229920006318 anionic polymer Polymers 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000011121 hardwood Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- 229940088417 precipitated calcium carbonate Drugs 0.000 description 5
- WQZGKKKJIJFFOK-QTVWNMPRSA-N D-mannopyranose Chemical compound OC[C@H]1OC(O)[C@@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-QTVWNMPRSA-N 0.000 description 4
- 229920002678 cellulose Polymers 0.000 description 3
- 239000001913 cellulose Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 125000000311 mannosyl group Chemical group C1([C@@H](O)[C@@H](O)[C@H](O)[C@H](O1)CO)* 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 229920000310 Alpha glucan Polymers 0.000 description 2
- 229920000945 Amylopectin Polymers 0.000 description 2
- 229920000926 Galactomannan Polymers 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- 239000008186 active pharmaceutical agent Substances 0.000 description 2
- 239000013051 drainage agent Substances 0.000 description 2
- 229930182830 galactose Natural products 0.000 description 2
- 239000002655 kraft paper Substances 0.000 description 2
- 238000009533 lab test Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- OMDQUFIYNPYJFM-XKDAHURESA-N (2r,3r,4s,5r,6s)-2-(hydroxymethyl)-6-[[(2r,3s,4r,5s,6r)-4,5,6-trihydroxy-3-[(2s,3s,4s,5s,6r)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]methoxy]oxane-3,4,5-triol Chemical compound O[C@@H]1[C@@H](O)[C@@H](O)[C@@H](CO)O[C@@H]1OC[C@@H]1[C@@H](O[C@H]2[C@H]([C@@H](O)[C@H](O)[C@@H](CO)O2)O)[C@H](O)[C@H](O)[C@H](O)O1 OMDQUFIYNPYJFM-XKDAHURESA-N 0.000 description 1
- 241000609240 Ambelania acida Species 0.000 description 1
- 229920000856 Amylose Polymers 0.000 description 1
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- 229920002101 Chitin Polymers 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 244000303965 Cyamopsis psoralioides Species 0.000 description 1
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 description 1
- 229920002324 Galactoglucomannan Polymers 0.000 description 1
- 229920001503 Glucan Polymers 0.000 description 1
- 229920000161 Locust bean gum Polymers 0.000 description 1
- 229920000881 Modified starch Polymers 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 244000046052 Phaseolus vulgaris Species 0.000 description 1
- 235000010627 Phaseolus vulgaris Nutrition 0.000 description 1
- 244000082204 Phyllostachys viridis Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 240000000111 Saccharum officinarum Species 0.000 description 1
- 235000007201 Saccharum officinarum Nutrition 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 240000004584 Tamarindus indica Species 0.000 description 1
- 235000004298 Tamarindus indica Nutrition 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 244000098338 Triticum aestivum Species 0.000 description 1
- 229920002000 Xyloglucan Polymers 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 239000010905 bagasse Substances 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 244000144992 flock Species 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 239000000416 hydrocolloid Substances 0.000 description 1
- 238000007641 inkjet printing Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000000711 locust bean gum Substances 0.000 description 1
- 235000010420 locust bean gum Nutrition 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000019426 modified starch Nutrition 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920000962 poly(amidoamine) Polymers 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001592 potato starch Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000001542 size-exclusion chromatography Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000000930 thermomechanical effect Effects 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 229920001221 xylan Polymers 0.000 description 1
- 150000004823 xylans Chemical class 0.000 description 1
Images
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
Definitions
- the paper machine runnability is often evaluated by the number of web breaks in proportion to production speed. To attain good runnability, the paper must run well with a low number of web breaks in each sub-process along the entire paper machine line. For example, the fluttering of the paper web in the drying section should be minimised in order to avoid the possible web breaks. In order to avoid fluttering and web breaks, the paper web should preferably have a good tensile strength and good residual tension after strain.
- Strength of wet paper web is one of the important factors in making of paper or board. Machines producing paper grades whose strength before drying is a critical factor may have high efficiency but their average production speed may be significantly lower than their nominal speed. The speed of these paper machines could be raised if the strength of the wet paper web could be increased.
- An object of the present invention is to provide an effective and simple method for improving tensile strength of a paper web or the like.
- An object of the present invention is to increase filler content of paper in order to reduce papermaking costs.
- the tensile strength of the wet paper or board is clearly improved when a polysaccharide which is anionic carboxymethyl cellulose having 1,4- ⁇ -anomeric configuration in the linkages between saccharide units is brought into a contact with fibres in the stock or with fibres in a wet paper web.
- the improved tensile strength of the wet web, as well as the improved dry tensile strength of the paper that may be achieved with the present invention enables an increase in the filler content of paper.
- a high filler content in the base paper may be used, corresponding to ash content e.g.
- the polysaccharide having 1,4- ⁇ -anomeric configuration in the linkages between saccharide units of the polysaccharide backbone or the main polysaccharide backbone is anionic carboxymethyl cellulose. It has been selected from the group comprising water soluble cellulose derivatives; galactomannans, such as guar gum or locust bean gum; galactoglucomannans; carboxymethyl cellulose; xylan and substituted glucans, such as xyloglucans; other suitable hydrocolloids, such as tamarind gum; chitosan; chitin; or their derivatives. According to the invention the polysaccharide having 1,4- ⁇ -anomeric configuration in the linkages between saccharide units is carboxymethyl cellulose.
- the polysaccharide having 1,4- ⁇ -anomeric configuration in the linkages between saccharide units of the polysaccharide backbone or the main polysaccharide backbone is carboxymethyl cellulose, CMC.
- Carboxymethyl cellulose is understood here as an anionic polymer, which is produced by introducing carboxylmethyl groups to the cellulose chain, the degree of substitution and the chain length of the cellulose backbone affecting the properties of CMC, such as water solubility. When the degree of substitution exceeds 0.3, carboxymethyl cellulose becomes water soluble.
- the polysaccharide having 1,4- ⁇ -anomeric configuration in the linkages between saccharide units is applied as a solution to the wet fibre web in any suitable manner.
- the solution is obtained by dissolving the polysaccharide in powder form into a solvent, typically water.
- the polysaccharide solution is free from discrete polysaccharide particles.
- the polysaccharide solution may comprise one polysaccharide or it may comprise a mixture of different polysaccharides, for example a mixture of two or three polysaccharides. Thus, a mixture of different polysaccharides may be applied to the fibre stock after machine chest or on the wet fibrous web.
- the concentration of the polysaccharide(s) in the polysaccharide solution is ⁇ 60 weight-%, more typically 0.02 - 5 weight-%, preferably 0.05 - 3 weight-%, more preferably 0.05 - 2 weight-%.
- Concentration of polysaccharides with high degree of polymerisation (DP) in the solution may be even ⁇ 1 weight-%, more typically 0.05 - 1 weight-%, even more typically 0.2 - 0.6 weight-%.
- Polymeric retention agent dosage may be 50 - 1000 g/t, preferably 100 - 600 g/t, given as dry polymer, and the polysaccharide dosage may preferably be 200 - 4000 g/t, preferably 500 - 2500 g/t, given as dry polymer.
- the polysaccharide is applied into the fibre stock together with an anionic, cationic or amphoteric dry strength agent.
- the dry strength agent is selected from the group comprising polyacrylamides, glyoxylated polyacrylamides, polyvinylamines, polyamine epichlorohydrine co-polymers (PAAE), starch derivatives, and carboxymethyl cellulose.
- the dry strength agent may be applied in amount of 0.1 - 4 kg/t paper, typically in amount 0.2 - 2 kg/t, given as active substance.
- the polysaccharide is applied by spraying onto the wet paper web. It has been observed that the polysaccharide amount, which is applied, may be reduced when the application is done by spraying, and still the improved tensile strength characteristics of the paper web are obtained.
- a polysaccharide solution suitable for use in the spraying may be obtained, for example, by dissolving a polysaccharide in powder form into water in order to form a 0.2 - 20 weight-%, preferably 0.3 - 3 weight-% solution.
- the polysaccharide is applied in amount 0.3 - 3 kg/(ton paper).
- the polysaccharide may be applied in amount ⁇ 2 g/m 2 , typically 0.05 - 1.5 g/m 2 , more typically ⁇ 1 g/m 2 , most typically 0.05 - 1 g/m 2 , preferably 0.05 - 0.5 g/m 2 , more preferably 0.05 - 0.3 g/m 2 on the wet paper web.
- two or more polysaccharides may be applied on the wet fibre web after each other by spraying.
- layers of different polysaccharides may easily be applied on top of each other in order to obtain desired properties.
- an anionic or cationic polymer solution may be applied to the wet paper web before or after the addition of the polysaccharide.
- the application of the anionic polymer is performed to the wet paper web before press section of a paper machine.
- the application of the polysaccharide to the wet paper web may be preceded or followed by application of cationic or anionic polymer solution.
- This kind of sequential application of polysaccharide and one or more polymers to the wet paper web, preferably through spraying may produce a marked improvement of dry and wet paper web strength.
- Anionic and cationic polymer solutions may also be pre-mixed together before their application, preferably by spraying, to the wet paper web.
- the paper web may comprise fibres originating from non-wood material, such as bamboo, sugar cane bagasse, hemp, wheat or rice straw.
- the filler content of the paper or board is increased, whereby the ash content in the wet paper or board web is >25 % for wood-free uncoated paper, >25 % for wood-free coated paper base paper, >34 % for super calendered (SC) paper, >13 % for coated mechanical base paper, >15 % for newsprint paper, fluting board or testliner board, the ash content being measured by burning the stock sample completely in 525 °C.
- SC super calendered
- the backbone of the guar gum is a linear chain of ⁇ 1,4-linked mannose residues to which galactose residues are 1,6-linked at every second mannose, forming short side-branches.
- Guar gum may be applied to the web in form of native guar gum, anionic guar gum or cationic guar gum.
- native, cationic or anionic guar gum may be applied to the wet paper web, which is formed without using addition of a cationic polymer to the stock.
- native or anionic guar gum may be applied to the wet paper web, which is formed from stock into which cationic polymer, such as cationic guar gum, is added.
- the experimental unit comprised a vacuum box, moving sample sledge with wire, and spraying unit.
- the amount of the chemical sprayed was adjusted by the speed of the moving sample sledge, while the spray remained constant and was immobilized.
- the samples were wet pressed with 350 kPa and 50 kPa for 5+2 minutes after spraying. The higher pressure gives higher dryness for test sheet. Chemical consistency during spray tests was 0.5%.
- Tensile strength was measured according to ISO 1924-2:2008. The dryness of the paper samples was determined by using a Mettler Toledo HR73 infra-red dryer.
- Pulp containing 70% hardwood with SR-value 24 and 30 % softwood with SR-value 28 was acquired from a Finnish pulp mill. SR-value was measured according to ISO 5267-1. Precipitated calcium carbonate was used as filler. Filler was added to the pulp and target level for addition was 20 % filler content in the final web. Retention chemical was Fennopol K3400R (Kemira Oyj) with dosage 200 g/t and it was added to the headbox feed flow. Tests were made with a small fourdrinier type of wire section. Grammage of formed web was 70 g/m 2 . Chemicals were sprayed on the wet web at the wire. The samples were wet pressed with 350 kPa and 50 kPa for 5+2 minutes after spraying.
- Tensile strength was measured according to ISO 1924-2:2008. The dryness of the paper samples was determined by using a Mettler Toledo HR73 infra-red dryer.
- FIG 3 shows results for tensile strength in semipilot test (Example 2) for sprayed guar gum and Figure 4 shows tensile energy adsorption in semipilot test (Example 2) for sprayed guar gum.
- the effect of guar gum wet web spraying dosage levels on wet web strength can be observed in the Figures. Spraying dosages were 0.1 g/m 2 (1.4 kg/t), 0.3 g/m 2 (4.2 kg/t) and 0.5 g/m 2 (7.1 kg/t). Dosages of 0.1 g/m 2 and 0.3 g/m 2 improved both wet web tensile and solids content after wet pressing.
- 0.5 g/m 2 improves strength further, but solids content in wet pressing is reduced. Therefore optimum dosage may be between 0.1 g/m 2 and 0.5 g/m 2 , at least under these experimental conditions.
- Tensile strength is needed for web to keep enough tension at paper machine dryer section to allow high operation speed. If the tension of the web is not high enough, the sheet does not follow dryer fabric and sheet fluttering may cause web break due to wind effect caused by high speed.
- Tensile energy adsorption T.E.A. improvement helps to avoid web break, if web has fault such as a hole, slime spot, sticky particle or locally lower basis weight, because higher strength reduces risk that web tears apart beging from the fault position.
- Test furnish was a mixture of softwood and hardwood kraft pulp for fine paper, containing 40 weigth-% scalenohedric precipitated calcium carbonate (PCC) filler. In some tests additional PCC was applied. Chemicals were added to furnish under stirring with magnetic stirrer before sheet preparation. Dosing time of cationic polyacrylamide (C-PAM) retention aid and guar gum was typical for paper machine retention system, see Table 1. Guar gum and C-PAM were premixed as powder in proportion 1:1, and then dissolved to 0.5 weight-% concentration with water, giving a final concentration of 0.25 weight-% guar gum and 0.25 weight-% C-PAM.
- C-PAM cationic polyacrylamide
- Chemicals used in the tests were: cationic potato starch (DS 0.035), guar gum (Sigma G4129) and cationic polyacrylamide, C-PAM, Fennopol K 3400 R (Kemira Oyj). All were dissolved to 0.5 weight-% solution except starch was cooked to 1 weight-% solution.
- Handsheets were prepared with Rapid Kötchen semi-automatic sheet former to 80 g/m2 basis weight according to ISO 5269-2:2004. Ash content was measured according to ISO 1762:2001.
- Dry tensile handsheets were vacuum dried according to Rapid-Kötchen method. Tensile indexes were measured according to ISO 1924-2:2008. The results can be seen in the Table 1. Table 1. The wet web tensile index and dry tensile index result for different handsheets.
Description
- The present invention relates to a method for improving papermaking or board making process according to the preambles of the enclosed claims.
- Economical production of paper and board requires a good runnability of a paper machine. The paper machine runnability is often evaluated by the number of web breaks in proportion to production speed. To attain good runnability, the paper must run well with a low number of web breaks in each sub-process along the entire paper machine line. For example, the fluttering of the paper web in the drying section should be minimised in order to avoid the possible web breaks. In order to avoid fluttering and web breaks, the paper web should preferably have a good tensile strength and good residual tension after strain.
- Strength of wet paper web is one of the important factors in making of paper or board. Machines producing paper grades whose strength before drying is a critical factor may have high efficiency but their average production speed may be significantly lower than their nominal speed. The speed of these paper machines could be raised if the strength of the wet paper web could be increased.
- Common dry strength agents do not improve strength of the wet paper web. One example of such dry strength agents is starch, which has a 1,4-α-anomeric structure. Typical starches include amylose, which is a linear 1,4-α-glucan polymer and amylopectin, which has branched structure. The amylopectin backbone is 1,4-α-glucan polymer and the branches are linked to the backbone with 1,6-α-glycosidic bonds.
- Fillers, such as clay, calcium carbonate, calcium sulphate or talc are used in paper and board making to reduce costs and to improve optical properties of paper or board. Fillers are added to the stock before the headbox of the paper machine. For coated paper grades coating pigments, which comprise the same minerals, may partly enter to the paper via the broke, which is recycled back to paper making process. The content of fillers and coating pigments is typically measured through ash content measurement by burning the stock or paper sample in 525 °C. The base paper for uncoated fine paper and for coated fine paper is made from softwood and hardwood and its ash content is typically 18 - 24 %. The base paper for 100 % softwood based uncoated fine paper and for coated fine paper has an ash content typically 10 - 17 %. An important limiting factor preventing the increase of filler content in fine papers is the reduced strength properties of the paper and reduced web runnability.
- Known methods and compositions are disclosed in
US 5,700,917 ,EP 0738737 ,US 6,346,554 ,US 6,596,126 ,WO 02/12388 WO 02/12349 - An object of this invention is to minimise or even eliminate the disadvantages existing in the prior art.
- An object of the present invention is to provide an effective and simple method for improving tensile strength of a paper web or the like.
- An object of the present invention is to increase filler content of paper in order to reduce papermaking costs.
- These objects are attained with the present invention having the characteristics presented below in the characterising parts of the independent claims.
- Typical method according to the present invention for improving papermaking or board making process is defined in
claim 1. It comprises, inter alia, - forming a fibre stock,
- leading the fibre stock to a headbox and feeding it to a wire to form a wet fibrous web, and
- applying at least one polysaccharide which is anionic carboxymethyl cellulose having 1,4-β-anomeric configuration in linkages between saccharide units of the polysaccharide backbone or the main polysaccharide backbone to the fibre stock after machine chest or on the wet fibrous web.
- Typical paper is produced by using the method according to the invention.
- Now it has been surprisingly found out that the tensile strength of the wet paper or board is clearly improved when a polysaccharide which is anionic carboxymethyl cellulose having 1,4-β-anomeric configuration in the linkages between saccharide units is brought into a contact with fibres in the stock or with fibres in a wet paper web. The improved tensile strength of the wet web, as well as the improved dry tensile strength of the paper that may be achieved with the present invention enables an increase in the filler content of paper. When the residual tension after strain is improved by the use of the present invention, a high filler content in the base paper may be used, corresponding to ash content e.g. over 25 % both for uncoated fine paper and for coated fine paper base paper made from softwood and hardwood mixture. Correspondingly, a high filler content in the base paper may be used for 100 % softwood based uncoated fine paper and for coated fine paper base paper, the high filler content corresponding to an ash content over 18 %. An improvement in tensile strength may enable an ash content increase also for other paper and board grades, such as ash content increase to over 15 % for newsprint grades, or ash content increase over 12 % coated mechanical base paper, or ash content increase over 34 % for SC paper. Improvement in tensile strength also may be utilised by changing to a cheaper raw material mixture for the stock. For example, less old corrugated container (OCC) and more collected paper from households to make test liner or fluting board grade. The ash content of recycled fibre based fluting or test liner board may be increased over 15%.
- Fillers, which are used in making or paper or board, and which are used in the present invention, and the content of which may be increased, are clay, calcium carbonate, calcium sulphate, titanium dioxide or talc, or their mixtures. Often the used filler has an anionic net charge.
- According to the invention the polysaccharide having 1,4-β-anomeric configuration in the linkages between saccharide units of the polysaccharide backbone or the main polysaccharide backbone is anionic carboxymethyl cellulose. It has been selected from the group comprising water soluble cellulose derivatives; galactomannans, such as guar gum or locust bean gum; galactoglucomannans; carboxymethyl cellulose; xylan and substituted glucans, such as xyloglucans; other suitable hydrocolloids, such as tamarind gum; chitosan; chitin; or their derivatives. According to the invention the polysaccharide having 1,4-β-anomeric configuration in the linkages between saccharide units is carboxymethyl cellulose.
- According to another embodiment which does not form part of the present invention the polysaccharide, which has 1,4-β-anomeric configuration in the linkages between saccharide units of the polysaccharide backbone or the main polysaccharide backbone, is guar gum. In this context guar gum is understood as a carbohydrate polymer containing galactose and mannose structural building blocks, especially containing one galactose unit for every two mannose units. The backbone is a linear chain of
β 1,4-linked mannose residues to which galactose residues are 1,6-linked at every second mannose, forming short side-branches. Guar gum is typically obtained as an extract of guar bean. It may be used in native form or it may be used in cationised or anionised form. - According to one embodiment which does not form part of the present invention, anionised guar gum is applied to the fibre stock or on the wet fibre web after application of cationic strength agent to the fibre stock and/or on the wet fibre web. The cationic strength agent may be cationic or amphoteric polyacrylamide, polyvinylamide, polyamidoamine, epichlorohydrin, starch, cationic guar gum or derivative of these. For example, cationic wet strength agent may be applied on the wet fibre web by spraying, after which anionised guar gum is applied by spraying. More typically, cationic wet strength agent is applied into the fibre stock, after which anionised guar gum is applied by spraying on the wet fibre web. Anionised guar gum has typically a charge density < 2 meq/g.
- According to the invention the polysaccharide having 1,4-β-anomeric configuration in the linkages between saccharide units of the polysaccharide backbone or the main polysaccharide backbone is carboxymethyl cellulose, CMC. Carboxymethyl cellulose is understood here as an anionic polymer, which is produced by introducing carboxylmethyl groups to the cellulose chain, the degree of substitution and the chain length of the cellulose backbone affecting the properties of CMC, such as water solubility. When the degree of substitution exceeds 0.3, carboxymethyl cellulose becomes water soluble.
- According to the invention the polysaccharide having 1,4-β-anomeric configuration in the linkages between saccharide units of the polysaccharide backbone or the main polysaccharide backbone as defined in
claim 1 is a polysaccharide with high degree of polymerisation (DP). This means polysaccharides which comprise > 500 anhydroglucose units. Size exclusion chromatography, SEC, may be used for determination of the polymerisation degree. It has been observed that the tensile strength of the wet paper or board is further improved when these polysaccharides are used. - Polysaccharide having 1,4-β-anomeric configuration in the linkages between saccharide units of the polysaccharide backbone or the main polysaccharide backbone and used in the present invention is water soluble. In case a derivative of the polysaccharide is used, the derivative is also water soluble. The viscosity (Brookfield) of the polysaccharide solution is < 5000 mPas, preferably < 2000 mPas. Solution may be diluted in order to achieve the desired concentration.
- The polysaccharide having 1,4-β-anomeric configuration in the linkages between saccharide units is applied as a solution to the wet fibre web in any suitable manner. Preferably the solution is obtained by dissolving the polysaccharide in powder form into a solvent, typically water. Preferably the polysaccharide solution is free from discrete polysaccharide particles. The polysaccharide solution may comprise one polysaccharide or it may comprise a mixture of different polysaccharides, for example a mixture of two or three polysaccharides. Thus, a mixture of different polysaccharides may be applied to the fibre stock after machine chest or on the wet fibrous web. Typically the concentration of the polysaccharide(s) in the polysaccharide solution is < 60 weight-%, more typically 0.02 - 5 weight-%, preferably 0.05 - 3 weight-%, more preferably 0.05 - 2 weight-%. Concentration of polysaccharides with high degree of polymerisation (DP) in the solution may be even < 1 weight-%, more typically 0.05 - 1 weight-%, even more typically 0.2 - 0.6 weight-%.
- According to one embodiment of the invention the polysaccharide is applied to the fibre stock between the last pump preceding the paper or board machine headbox and the outlet of the paper or board machine headbox. Preferably, the polysaccharide is added to the stock as near the headbox as possible, or the polysaccharide may be added directly to the headbox, if adequate mixing to the stock can be secured. Addition of the polysaccharide near the headbox improves the bonding of the fibres together with the polysaccharide, as the polysaccharide remains in outstretched form due to short residence time in the stock and the adsorption of the polysaccharide over the fibre surface is reduced. Also, when the polysaccharide is added to the stock after the last pump, the risk for breaking the flocks generated by the polysaccharide and fragmentation of the polysaccharide backbone due to shear forces is minimised. Thus, the activity of the polysaccharide remains in a high level, and it dosage may be reduced or better tensile strength values may be obtained by using the same dosage.
- According to one embodiment of the invention the polysaccharide is applied into the fibre stock together with a retention or drainage agent. The polysaccharide and the retention agent are added to the fibre stock typically near the headbox, for example by dosing at the machine filter. The retention or drainage agent may be any suitable retention agent. The retention agent may be selected from a group comprising anionic or cationic polyacrylamide, polyvinylamine, polyethyleneimine, cationic starch, bentonite or silica. Especially the retention agent may be anionic or cationic polyacrylamide, polyvinylamine or polyethyleneimine. The retention agent and the polysaccharide may be added as separate solutions, or they may be added as single solution, comprising both the retention agent and the polysaccharide. Polymeric retention agent dosage may be 50 - 1000 g/t, preferably 100 - 600 g/t, given as dry polymer, and the polysaccharide dosage may preferably be 200 - 4000 g/t, preferably 500 - 2500 g/t, given as dry polymer.
- According to another embodiment of the invention the polysaccharide is applied into the fibre stock together with an anionic, cationic or amphoteric dry strength agent. The dry strength agent is selected from the group comprising polyacrylamides, glyoxylated polyacrylamides, polyvinylamines, polyamine epichlorohydrine co-polymers (PAAE), starch derivatives, and carboxymethyl cellulose. The dry strength agent may be applied in amount of 0.1 - 4 kg/t paper, typically in amount 0.2 - 2 kg/t, given as active substance.
- According to one preferred embodiment of the invention the polysaccharide is applied on the wet fibre web between the headbox and the last nip of a press section. According to one preferred embodiment of the invention the polysaccharide is applied on the wet fibre web by spraying, by coating, by film transfer or by foam layer application. It may be applied by using film transfer to a press belt, or by feeding of polysaccharide solution from a separate headbox. Preferably the application of the polysaccharide solution is performed by spraying. It has been found out that the spraying of the polysaccharide solution onto the fibre web provides many surprising advantages. Spraying of the polysaccharide solution does not influence the formation of the paper web, whereby there is no negative effects to be noticed in the final paper properties. On the other hand, it has also been noticed that the retention of the polysaccharide to the web is improved. This means that the used amount of the polysaccharide can be kept low, and chemical losses may be minimised. It has been observed that when the polysaccharide solution is added by spraying, the polysaccharide is evenly distributed through the whole web. No significant difference in amount of the polysaccharide can be observed between the surfaces and the core part of the web.
- Preferably, the polysaccharide is applied by spraying onto the wet paper web. It has been observed that the polysaccharide amount, which is applied, may be reduced when the application is done by spraying, and still the improved tensile strength characteristics of the paper web are obtained. A polysaccharide solution suitable for use in the spraying may be obtained, for example, by dissolving a polysaccharide in powder form into water in order to form a 0.2 - 20 weight-%, preferably 0.3 - 3 weight-% solution.
- According to still another embodiment, the polysaccharide is applied by foam layer application or foam coating. The polysaccharide may be applied by foam coating, whereby the polysaccharide is applied as a foam, which has an air content of 60 - 95 %, onto the wet paper web.
- Irrespective of the method of application of the polysaccharide, the polysaccharide is applied in amount 0.3 - 3 kg/(ton paper). When the polysaccharide is applied by spraying, it may be applied in amount ≤ 2 g/m2, typically 0.05 - 1.5 g/m2, more typically ≤ 1 g/m2, most typically 0.05 - 1 g/m2, preferably 0.05 - 0.5 g/m2, more preferably 0.05 - 0.3 g/m2 on the wet paper web.
- According to the invention the polysaccharide solution is applied on the wet paper web when the dryness of the web is < 50 %, typically < 40 %, more typically < 30 %, preferably 8 - 15 %. When the pulp suspension enters the headbox and thus the paper machine, its dryness level is typically more or equal to 0.3 % and less than 2 %. The first water removal from the web is driven by gravity when the web enters the wire section from the headbox. As paper travels further in the wire section, water removal is assisted by different vacuum units. After the wire section, the dryness of the paper is typically 14 - 22 %. The dryness of paper increases to 40 - 55 % during wet pressing. The applying of the polysaccharide solution is preferably conducted before the last vacuum zone of the wire section, preferably by spraying.
- According to one embodiment of the invention two or more polysaccharides may be applied on the wet fibre web after each other by spraying. Thus layers of different polysaccharides may easily be applied on top of each other in order to obtain desired properties.
- According to one embodiment an anionic or cationic polymer solution may be applied to the wet paper web before or after the addition of the polysaccharide. The application of the anionic polymer is performed to the wet paper web before press section of a paper machine. For example, the application of the polysaccharide to the wet paper web may be preceded or followed by application of cationic or anionic polymer solution. This kind of sequential application of polysaccharide and one or more polymers to the wet paper web, preferably through spraying, may produce a marked improvement of dry and wet paper web strength. Anionic and cationic polymer solutions may also be pre-mixed together before their application, preferably by spraying, to the wet paper web.
- The present invention is advantageous for improving strength of the wet paper web when producing wood-free uncoated and coated paper grades. The present invention is also suitable for improving runnability of a wet paper or board web by improving strength of the wet paper web when producing paper grades including wood-free uncoated paper, wood-free coated paper, super calendered (SC) paper, ultralight weight coated (ULWC) paper, light weight coated (LWC) paper or newsprint paper, but not limited to these. Especially paper webs that are to be used for making recording substrates for the inkjet printing are suitable to be treated according to the method of the present invention. The paper web may comprise fibres from hardwood trees or softwood trees or a combination of both fibres. The fibres may be obtained by any suitable pulping or refining technique normally employed in paper making, such as thermomechanical pulping (TMP), chemimechanical (CMP), chemithermomechanical pulping (CTMP), groundwood pulping, alkaline sulphate (kraft) pulping, acid sulphite pulping, and semichemical pulping. The paper web may comprise only virgin fibres or recycled fibres or a combination of both. The weight of the final paper web is 30 - 800 g/m2, typically 30 - 600 g/m2, more typically 50 - 500 g/m2, preferably 60 - 300 g/m2, more preferably 60 - 120 g/m2, even more preferably 70 - 100 g/m2.
- In some embodiments the paper web may comprise fibres originating from non-wood material, such as bamboo, sugar cane bagasse, hemp, wheat or rice straw. According to one embodiment of the invention the filler content of the paper or board is increased, whereby the ash content in the wet paper or board web is >25 % for wood-free uncoated paper, >25 % for wood-free coated paper base paper, >34 % for super calendered (SC) paper, >13 % for coated mechanical base paper, >15 % for newsprint paper, fluting board or testliner board, the ash content being measured by burning the stock sample completely in 525 °C.
- One or more layers of chemical solutions may be applied to the wet paper web before the press section or drying section. The addition of a cationic polymer to the stock of fibres is not compulsory, but it may be performed. The chemical solutions are preferably applied to the wet paper web by spraying, as described in the application, but they may be applied by coating, film transfer, foam layer application or feeding from a separate headbox. The chemical solution that is applied to the web, e.g. by spraying, may be a solution of carboxymethyl cellulose (CMC), polyvinyl alcohol (PVA), chitosan or guar gum. Guar gum is here understood as a galactomannan. It is a polysaccharide comprising galactose and mannose. The backbone of the guar gum is a linear chain of
β 1,4-linked mannose residues to which galactose residues are 1,6-linked at every second mannose, forming short side-branches. Guar gum may be applied to the web in form of native guar gum, anionic guar gum or cationic guar gum. For example, native, cationic or anionic guar gum may be applied to the wet paper web, which is formed without using addition of a cationic polymer to the stock. In another example, native or anionic guar gum may be applied to the wet paper web, which is formed from stock into which cationic polymer, such as cationic guar gum, is added. - Elementary Chlorine Free-bleached pine pulp was obtained from a Finnish pulp mill. The pulp was refined and dewatered at the mill. The pulp was packed as never-dried into airtight polyethylene bags, and kept at -18°C until used for testing. The Schopper-Riegler (SR) value of the pulp after dewatering and freezing was 20, measured according to ISO 5267-1. Native dissolved guar gum (Sigma G4129), carboxymethyl cellulose (DS 0.7, DP 140) and chitosan (Mw 400,000 g/mol) was added to the thick stock pulp 30 - 90 min before sheet preparation as a 0.5 weight-% solution.
- Wet and dry handsheets were prepared according to SCAN-C 26:76 standard. Grammage of handsheets was 60 g/m2. After wet pressing the handsheets were stored at cold storage room in airproof packages before measurements in order to maintain constant moisture in the sheets.
- For the spraying of chemicals at laboratory, formed wet handsheets were placed onto the wire and attached using vacuum. Vacuum usage enhanced also the penetration of chemicals into the paper during spraying. The experimental unit comprised a vacuum box, moving sample sledge with wire, and spraying unit. The amount of the chemical sprayed was adjusted by the speed of the moving sample sledge, while the spray remained constant and was immobilized. The samples were wet pressed with 350 kPa and 50 kPa for 5+2 minutes after spraying. The higher pressure gives higher dryness for test sheet. Chemical consistency during spray tests was 0.5%.
- Tensile strength was measured according to ISO 1924-2:2008. The dryness of the paper samples was determined by using a Mettler Toledo HR73 infra-red dryer.
-
-
Figure 1 shows results of laboratory tests (Example 1) for guar gum, which was added to thick stock pulp or sprayed on wet web. It can be seen that it is advantageous to add guar gum for wet web strength later at paper machine process rather than to thick stock pulp. -
Figure 2 shows results for laboratory tests (Example 1) for CMC, chitosan and guar gum, each of which was sprayed on wet web. The effect of different polysaccharides on wet web strength can be seen. Guar gum is most effective. Chitosan and carboxymethyl cellulose (CMC) improved also wet web strength. As reference were used a spraying of water or handsheet without any spraying. - Pulp containing 70% hardwood with SR-
value 24 and 30 % softwood with SR-value 28 was acquired from a Finnish pulp mill. SR-value was measured according to ISO 5267-1. Precipitated calcium carbonate was used as filler. Filler was added to the pulp and target level for addition was 20 % filler content in the final web. Retention chemical was Fennopol K3400R (Kemira Oyj) with dosage 200 g/t and it was added to the headbox feed flow. Tests were made with a small fourdrinier type of wire section. Grammage of formed web was 70 g/m2. Chemicals were sprayed on the wet web at the wire. The samples were wet pressed with 350 kPa and 50 kPa for 5+2 minutes after spraying. - Tensile strength was measured according to ISO 1924-2:2008. The dryness of the paper samples was determined by using a Mettler Toledo HR73 infra-red dryer.
-
Figure 3 shows results for tensile strength in semipilot test (Example 2) for sprayed guar gum andFigure 4 shows tensile energy adsorption in semipilot test (Example 2) for sprayed guar gum. The effect of guar gum wet web spraying dosage levels on wet web strength can be observed in the Figures. Spraying dosages were 0.1 g/m2 (1.4 kg/t), 0.3 g/m2 (4.2 kg/t) and 0.5 g/m2 (7.1 kg/t). Dosages of 0.1 g/m2 and 0.3 g/m2 improved both wet web tensile and solids content after wet pressing. Dosage of 0.5 g/m2 improves strength further, but solids content in wet pressing is reduced. Therefore optimum dosage may be between 0.1 g/m2 and 0.5 g/m2, at least under these experimental conditions. Tensile strength is needed for web to keep enough tension at paper machine dryer section to allow high operation speed. If the tension of the web is not high enough, the sheet does not follow dryer fabric and sheet fluttering may cause web break due to wind effect caused by high speed. Tensile energy adsorption T.E.A. improvement helps to avoid web break, if web has fault such as a hole, slime spot, sticky particle or locally lower basis weight, because higher strength reduces risk that web tears apart beging from the fault position. - Test furnish was a mixture of softwood and hardwood kraft pulp for fine paper, containing 40 weigth-% scalenohedric precipitated calcium carbonate (PCC) filler. In some tests additional PCC was applied. Chemicals were added to furnish under stirring with magnetic stirrer before sheet preparation. Dosing time of cationic polyacrylamide (C-PAM) retention aid and guar gum was typical for paper machine retention system, see Table 1. Guar gum and C-PAM were premixed as powder in proportion 1:1, and then dissolved to 0.5 weight-% concentration with water, giving a final concentration of 0.25 weight-% guar gum and 0.25 weight-% C-PAM.
- Chemicals used in the tests were: cationic potato starch (DS 0.035), guar gum (Sigma G4129) and cationic polyacrylamide, C-PAM, Fennopol K 3400 R (Kemira Oyj). All were dissolved to 0.5 weight-% solution except starch was cooked to 1 weight-% solution.
- Handsheets were prepared with Rapid Kötchen semi-automatic sheet former to 80 g/m2 basis weight according to ISO 5269-2:2004. Ash content was measured according to ISO 1762:2001.
- Wet web sheets were wet pressed according to ISO 5269-1:2005, but pressing time was 1 min at 2 bar pressure between 2 plotters on top and 2 plotters under. In tests D and E the wet pressing was 2 min at 4 bar pressure. Wet web tensile measurements were performed at the dry content after wet pressing.
- Dry tensile handsheets were vacuum dried according to Rapid-Kötchen method. Tensile indexes were measured according to ISO 1924-2:2008. The results can be seen in the Table 1.
Table 1. The wet web tensile index and dry tensile index result for different handsheets. Dose time -10min - 20 s -15 s -15 s Starch added PCC C-PAM Guar gum sheet ash, 525 °C wet web tensile index dry tensile index Test kg/t % g/t g/t % Nm/g Nm/ g A 0 0 0 0 11 0,46 40 B 0 0 0 600 17 0,71 33 C 0 0 150 150 32 0,46 21 D 0 20 150 0 38 0,45 14 E 6 20 150 0 38 0,37 15 - From the results it can be seen that the wet web tensile index was improved in test B compared to test A; also ash content increased, which reduced the dry tensile index. In test C significantly higher ash content was achieved with guar gum and C-PAM blend with similar wet web tensile compared to test A. In test E cationic starch was used as strength agent in high filler containing pulp. Starch decreased wet web strength compared to test D.
- Even if the invention was described with reference to what at present seems to be the most practical and preferred embodiments, it is appreciated that the invention shall not be limited to the embodiments described above, but the invention is intended to cover also different modifications and equivalent technical solutions within the scope of the enclosed claims.
Claims (12)
- Method for improving papermaking or board making process, comprising- forming a fibre stock,- using a filler in making of paper or board, which filler is selected from clay, calcium carbonate, calcium sulphate, titanium dioxide, talc, and their mixtures,- leading the fibre stock to a headbox and feeding it to a wire to form a wet fibrous web,characterised in
applying to the fibre stock after machine chest or on the wet fibrous web when the dryness of the web is < 50 % at least one polysaccharide which is anionic carboxymethyl cellulose having 1,4-β-anomeric configuration in linkages between saccharide units of the polysaccharide backbone or the main polysaccharide backbone in amount of 0.3 - 3 kg/(ton paper), the polysaccharide comprising > 500 anhydroglucose units. - Method according to claim 1, characterised in applying the polysaccharide as a solution, whereby the concentration of the polysaccharide in the polysaccharide solution is 0.02 - 5 weight-%, preferably 0.05 - 3 weight-%, more preferably 0.05 - 2 weight-%.
- Method according to any of preceding claims 1 - 2, characterised in applying a mixture of different polysaccharides to the fibre stock after machine chest or on the wet fibrous web.
- Method according to any of preceding claims 1 - 3, characterised in applying the polysaccharide to the fibre stock between the last pump preceding the paper machine headbox and the outlet of the paper machine headbox.
- Method according to claim 4, characterised in applying the polysaccharide into the fibre stock together with a retention agent, and selecting the retention agent from a group comprising anionic or cationic polyacrylamide, polyvinylamine, polyethyleneimine, cationic starch, bentonite or silica, especially from anionic or cationic polyacrylamide, polyvinylamine or polyethyleneimine.
- Method according to any of claims 1 - 3, characterised in applying the polysaccharide on the wet fibre web between the headbox and the last nip of the press section.
- Method according to claim 6, characterised in applying the polysaccharide on the fibre web by spraying, by coating, by film transfer or by foam layer application.
- Method according to claim 7, characterised in applying the polysaccharide by spraying as a solution with a concentration in the range of 0.2 - 20 weight-%, preferably 0.3 - 3 weight-%.
- Method according to claim 7, characterised in applying the polysaccharide by foam coating, whereby the polysaccharide is applied as a foam having an air content of 60 - 95 %.
- Method according to any of claims 7 - 9, characterised in applying the polysaccharide solution on the wet paper web when the dryness of the web is preferably 8 - 15 %.
- Method according to claim 1, characterised in producing wood-free uncoated paper, wood-free coated paper, super calendered (SC) paper, ultralight weight coated (ULWC) paper, light weight coated (LWC) paper or newsprint paper.
- Method according to claim 1, characterised in increasing filler content of the paper or board, whereby the ash content in the wet paper or board web is- >25 % for wood-free uncoated paper,- >25 % for wood-free coated paper base paper,- >34 % for super calendered (SC) paper,- >13 % for coated mechanical base paper,- >15 % for newsprint paper, fluting board or testliner board,the ash content being measured by burning the stock sample in 525 °C
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ES (2) | ES2674881T3 (en) |
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BR112013007876A2 (en) | 2019-08-27 |
CA2813148C (en) | 2018-02-06 |
BR112013007244A2 (en) | 2016-06-14 |
CN103140626A (en) | 2013-06-05 |
FI125713B (en) | 2016-01-15 |
CA2813148A1 (en) | 2012-04-05 |
FI20106021A (en) | 2012-04-02 |
WO2012042116A1 (en) | 2012-04-05 |
US20130299109A1 (en) | 2013-11-14 |
CN103201426B (en) | 2016-05-11 |
EP2622132A1 (en) | 2013-08-07 |
BR112013007876B1 (en) | 2020-12-29 |
EP2622132B1 (en) | 2018-04-04 |
PT2622132T (en) | 2018-07-03 |
FI20106021L (en) | 2012-04-02 |
ES2674881T3 (en) | 2018-07-04 |
CN103201426A (en) | 2013-07-10 |
ES2791997T3 (en) | 2020-11-06 |
WO2012042115A1 (en) | 2012-04-05 |
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