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EP1458929A1 - Charge utilisee dans la fabrication du papier support et procede de fabrication du papier support - Google Patents

Charge utilisee dans la fabrication du papier support et procede de fabrication du papier support

Info

Publication number
EP1458929A1
EP1458929A1 EP02804592A EP02804592A EP1458929A1 EP 1458929 A1 EP1458929 A1 EP 1458929A1 EP 02804592 A EP02804592 A EP 02804592A EP 02804592 A EP02804592 A EP 02804592A EP 1458929 A1 EP1458929 A1 EP 1458929A1
Authority
EP
European Patent Office
Prior art keywords
hardwood pulp
pulp
aspen
mechanical
base paper
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.)
Withdrawn
Application number
EP02804592A
Other languages
German (de)
English (en)
Inventor
Markku Leskelä
Stina Nygard
Gudrun Pauler-Johansson
Maija Pitkänen
Eeva ANÄS
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Metsa Board Oyj
Original Assignee
M Real Oyj
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by M Real Oyj filed Critical M Real Oyj
Publication of EP1458929A1 publication Critical patent/EP1458929A1/fr
Withdrawn legal-status Critical Current

Links

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
    • D21H17/63—Inorganic compounds
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • D21H17/675—Oxides, hydroxides or carbonates
    • 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
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
    • 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
    • D21H21/50—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 form
    • D21H21/52—Additives of definite length or shape

Definitions

  • the present invention relates to the use of precipitated calcium carbonates (PCC) as fillers for the manufacture of base paper together with mechanical hardwood pulp and chemical softwood pulp, and to a method for the manufacture of base paper, in which method pulp produced from hard woods, in particular from the wood of the genus Populus, and chemical softwood pulp are used together with a PCC filler.
  • PCC precipitated calcium carbonates
  • base papers in particular in thin base papers, kaolins and ground calcium carbonates (GCC) are used as fillers.
  • GCC ground calcium carbonates
  • Thin base papers are traditionally manufactured in acidic conditions, wherein it is not possible to use calcium carbonates but other compounds, and thus PCC and GCC are used mainly in fine papers.
  • the paper In coated base papers, the paper must be dense in order that coating colour shall stay on the surface of the paper forming a well-covering layer and shall not be able to penetrate into the base paper during the coating process. In order that coated paper should have good printability, it is desired that coating layers cover the base paper completely. Thin coating layers shall provide good coverage and the gloss of printed paper shall be high without disturbing variation. Moreover, the bonding strength of the paper, which is measured, when needed, as a Scott bond value, must be sufficiently high in order that the paper shall not crack during printing. Papers are printed typically with a heatset offset printing press, in which connection the surface of finished coated paper may bubble if the strength of the base paper in the z-direction is not sufficient.
  • the filler should additionally have a high opacity (light scattering) and brightness, but at the same time it is also very important that the filler does not reduce the bonding strength of the paper nor, on the other hand, increase the porosity of the base paper.
  • the strength in the z-direction is also critical even though printing ink is not dried in a separate dryer.
  • the requirement for strength is caused by the fact that printing inks are very viscous and, at the outlet side of the printing nip, the paper is subjected to a force that tends to crack the paper.
  • precipitated calcium carbonates are good fillers in particular in uncoated fine papers. They provide high brightness and opacity and, as compared with other mineral fillers, bulk is also better.
  • the advantages attained are basically based on the fact that in the process of manufacturing PCC the shape and size of particles can be controlled by varying process control parameters. High brightness is based on the fact that, since the process is synthetic, by means of pure raw materials it is possible to obtain an end result that is better than that of ground calcium carbonates. The manufacture of PCC is also economically competitive in large plants as compared with other fillers.
  • the shape and size of the filler particles can be adjusted within fairly large limits. This has led, among other things, to the fact that PCC pigments have also become competitive as coating pigments. Calcium carbonate pigments can generally be used only in papermaking processes that have a neutral or alkaline pH. Carbonates dissolve under acidic conditions. It has been possible to avoid this limitation as well by developing PCC pigments that can be used in slightly acidic conditions.
  • PCC pigments have achieved a strong position as fillers of uncoated fine papers, the particles being typically complex in shape and fairly large in size, and also in coatings of fine papers, the particles being typically simpler and smaller in size.
  • PCC fillers are used in uncoated office papers in proportions of over 15 wt-%, the aim being to increase brightness and opacity and to reduce costs.
  • the particle morphology of PCC has been designed so that bulk is also preserved as well as possible.
  • the particles of PCC are "sea urchin"-like in morphology, which is again very weak from the viewpoint of the density and bonding strength of the web.
  • Synthetic precipitated PCC is either aragonite or calcite depending on the manufacturing conditions. Typically, aragonite is needle-like in morphology, which is suitable for the coating of paper. Calcite precipitates as scalenohedral, i.e.
  • the appended figure 1 illustrates the particles by means of SEM pictures.
  • the particles used in the coatings of fine papers are simpler in type and smaller in size.
  • the PCC pigments have not achieved any particular success as fillers of thin base papers.
  • the filler shall have high brightness and opacity, i.e. light-scattering, but at the same time it is very important that the fillers do not lower the bonding strength of the paper and, on the other hand, do not increase the porosity of the base paper.
  • opacity decreases, which, in turn, must be compensated for by increasing the light-scattering coefficient.
  • density naturally deteriorates, i.e. decreases when the basis weight is reduced.
  • PCC fillers do not meet simultaneously all the requirements associated with the manufacture of thin base paper.
  • the brightness and opacity of the base paper may be high but, at the same time, the bonding strength of the base paper has decreased to an alarming extent and its density has deteriorated such that the coating colour has penetrated into the base paper.
  • FI patent 100 729 describes a filler used in paper manufacture and mainly consisting of calcium carbonate, and a method for its manufacture.
  • calcium carbonate is precipitated onto the surface of noil fibrils produced from cellulose fibre and/or mechanical pulp fibre by refining.
  • This filler that is based on cellulose fibre or mechanical pulp fibre and on calcium carbonate imparts good optical properties and good strength to the paper.
  • FI patent 103 417 discloses a method for manufacturing a base paper suitable for the manufacture of coated fine paper by combining groundwood pulp made from hardwood and chemical softwood pulp.
  • mechanical pulp manufactured from aspen or from wood of the genus Populus and chemical softwood pulp are used as a combination, thereby producing a pulp suitable for the manufacture of base paper in respect of its strength properties.
  • the advantages of aspen pulp include high brightness and brightness stability as compared with spruce groundwood. This is due in particular to the low lignin content of aspen groundwood pulp or equivalent mechanical pulp and to its low concentration of carbonyl groups. By this means it is possible to manufacture fine paper with high brightness with a lower basis weight than usual.
  • PCC type filler which is suitable in particular for the manufacture of thin base paper together with mechanical hardwood pulp and chemical softwood pulp and which meets simultaneously all the requirements placed on the filler of base paper, as well as for a method for the manufacture of a base paper in which mechanical pulp based on hard woods, such as aspen or trees of the genus Populus, and chemical softwood pulp are used together with a PCC filler.
  • An object of the invention is to provide a method for the manufacture of base paper, in particular for the manufacture of thin base paper, by means of which a base paper is obtained that has a low basis weight, a good internal strength and density, as well as improved light-scattering and opacity.
  • An object of the invention is also the use of precipitated calcium carbonate (PCC) as a filler for the manufacture of base paper together with mechanical hardwood pulp and chemical softwood pulp, which filler meets in particular the requirements placed above on the filler of base paper.
  • PCC precipitated calcium carbonate
  • An object of the invention is further to provide a method for the manufacture of base paper, in which method mechanical pulp based on hard woods, such as aspen or trees of the genus Populus, and chemical softwood pulp are used together with a PCC filler, whereby all the desired properties of the base paper can be achieved simultaneously.
  • wood species of the genus Populus which are preferably selected from the group of the following species: P. tremula, P. tremuloides, P. balsamea, P. balsamifera, P. trichocarpa and P. heterophylla, or aspen species crossbred from different mother aspens, such as hybrid aspen species, and species produced by gene technology, or poplar, or from a blend of mechanical pulps produced from the above-mentioned species.
  • wood species are native aspen P. tremula, Canadian aspen P.
  • Mechanical hardwood pulp may optionally contain 70 wt-% of spruce or pine at the maximum. Instead of aspen it is also possible to use other hardwood, such as, birch, eucalyptus or acacia. Such mechanical hardwood pulps can be prepared as blends that contain, for example, two hard woods and then, for example, spruce, as softwood. The proportion of spruce may be 70 % at the maximum, preferably 50 % at the maximum, and particularly preferably below 30 %.
  • Mechanical hardwood pulps have shorter fibres than chemical birch pulp or mechanical spruce pulps. Therefore the same basis weight of mechanical hardwood pulp comprises more fibres than chemical birch pulp or mechanical spruce pulp. This results in a higher light-scattering ability, a good formation, i.e. a lower variation of basis weight in a small scale, in a low surface roughness, and bulk is also good.
  • CMTP chemimechanical pulp
  • PGW pressure groundwood
  • at least 30 wt-% and particularly preferably at least 50 wt-% of the fibres of the hardwood pulp originate from aspen, hybrid aspen and/or poplar.
  • Hardwood raw material is chipped, after which mechanical pulp, refiner mechanical pulp (TMP) or chemimechanical pulp (CTMP) is manufactured from the chips in a manner known in itself.
  • TMP refiner mechanical pulp
  • CMP chemimechanical pulp
  • a stock is prepared from the mechanical pulp together with chemical pulp, and a PCC filler having a particle size distribution of 90 % ⁇ 9 ⁇ m, 50 % ⁇ 5 ⁇ m and 20 % ⁇ 1.5 ⁇ m is used as a filler.
  • the stock may contain additives, such as different starches, starch derivatives and retention agents.
  • the dry solids content of the stock is 0.1 - 5 wt-%.
  • the water phase of the stock it is possible to use, for example, the circulation water of the paper machine.
  • Bleached chemical softwood pulp is preferably used as the chemical pulp.
  • the amount of the mechanical pulp is then 20 - 80 wt-%, preferably 30 - 70 wt-% and the amount of the bleached chemical softwood pulp is 80 - 20 wt-%, preferably 70 - 30 wt-%, calculated from the dry solids of the stock.
  • a paper web is formed for a paper machine from the stock of mechanical hardwood pulp and chemical pulp in accordance with the prior art, for example, by using a gap former.
  • the fibre composition of the base paper in accordance with the invention comprises 20 - 70 wt-% of mechanical hardwood pulp, preferably aspen-based pulp, most preferably aspen groundwood or aspen-CTMP pulp and very preferably aspen-CTMP pulp, and 80 - 30 wt-% of chemical softwood pulp, preferably bleached chemical pine pulp.
  • the base paper can be coated by any suitable method known in the art, whereby a coating layer having a basis weight of 5 - 50 g/m 2 , preferably 5 - 30 g/m 2 , is formed on at least one surface, preferably on both surfaces of the paper web.
  • High-quality fine paper is obtained from the base paper in accordance with the invention by coating it with a suitable pigment-containing coating colour.
  • the coating colour can be applied to the material web in a manner known in itself.
  • the coating of the paper can be carried out on-line or off-line by means of a conventional coating device, i.e. by blade coating, or by means of film coating or surface spraying.
  • the base paper manufactured by the method in accordance with the invention and the coated paper manufactured further from it can be calendered by any calendering method known in the prior art.
  • calendering is accomplished on-line as soft calendering, thereby obtaining smooth and glossy or matte-surfaced products whose bulk, opacity and stiffness meet the requirements. Examples
  • filler of base paper is composed both of so-called fresh filler and of the filler coming from coated paper broke (the filler containing the mineral pigments of coating layer). For this reason, the filler was dosed to some of the test points as coated broke from a paper mill, in which broke the mineral main component was the ground carbonate contained in the coating. At these points, fresh filler constituted 6 percentage units of the filler and the filler coming from broke constituted 6 percentage units thereof.
  • Fig. 2 illustrates the particle size distributions graphically. The values have been measured on a Malvern Master Size device.
  • the properties of the sheets are shown in the following Table 2.
  • the tensile and tear indexes are geometric means from the machine and cross-direction results
  • Example 1 Based paper was manufactured from the pulps on a pilot-scale paper machine. The paper machine had a gap former. The same fillers were added to the paper as in Example 1 as follows:
  • the base papers were made into rolls which were dried and then analyzed.
  • the measurement results of the following Table 3 are means from the measurements of four rolls.
  • the tensile and tear indexes are geometric means in the machine and cross direction. Table 3
  • the base papers were coated with the same coating colours and supercalendered.
  • the target coating amount was 18 g/m 2 on both sides of paper.
  • the lineal pressure of calendering was 280 kN/m.
  • the only clear difference after coating is brightness, which is better in the case of PCC2.
  • the usual expectation is, however, that if brightness is as many as 1.3 units higher in finished paper, the opacity of the paper having higher brightness is expected to be clearly lower than it is in the paper having lower brightness.
  • the optical properties of the PCC2-containing paper must be considered superior to those of the PCCl paper. There is no practical difference in the surface properties of the paper (smoothness, gloss).

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)

Abstract

L'invention porte sur l'utilisation de carbonates de calcium précipités (PCC) utilisés comme charges dans la fabrication du papier support avec une pâte mécanique de feuillus et une pâte chimique de résineux. L'invention porte également sur un procédé de fabrication du papier support selon lequel la pâte produite à partir des feuillus, notamment le bois du genre peuplier, et la pâte chimique de résineux, sont utilisées avec une charge de PCC. L'utilisation du carbonate de calcium précipité (PCC) dans la fabrication du papier support avec une pâte mécanique de feuillus et une pâte chimique de résineux se caractérise en ce qu'une quantité égale ou supérieure à 20 % en poids des fibres de la pâte mécanique de feuillus est incluse dans la fraction granulométrique des fibres de moins de 200 mesh et 10 à 40 % en poids de ces fibres sont inclus dans la fraction granulométrique des fibres de 28/48 mesh ; la brillance de la pâte mécanique de feuillus est >/= à 75, la granulométrie du carbonate de calcium précipité est de 90 % >/= 9 mu m, 50 % >/= 5 mu m et 20 % </= 1,5 mu m, le poids de base du papier support étant compris entre 25 et 150 g/m2.
EP02804592A 2001-11-28 2002-11-21 Charge utilisee dans la fabrication du papier support et procede de fabrication du papier support Withdrawn EP1458929A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI20012328 2001-11-28
FI20012328A FI116573B (fi) 2001-11-28 2001-11-28 Täyteaine ohuiden pohjapaperien valmistukseen ja menetelmä pohjapaperin valmistamiseksi
PCT/FI2002/000939 WO2003050355A1 (fr) 2001-11-28 2002-11-21 Charge utilisee dans la fabrication du papier support et procede de fabrication du papier support

Publications (1)

Publication Number Publication Date
EP1458929A1 true EP1458929A1 (fr) 2004-09-22

Family

ID=8562359

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02804592A Withdrawn EP1458929A1 (fr) 2001-11-28 2002-11-21 Charge utilisee dans la fabrication du papier support et procede de fabrication du papier support

Country Status (9)

Country Link
US (1) US20040256067A1 (fr)
EP (1) EP1458929A1 (fr)
JP (1) JP2005511916A (fr)
CN (1) CN1309904C (fr)
AU (1) AU2002366533B2 (fr)
CA (1) CA2466899A1 (fr)
FI (1) FI116573B (fr)
NZ (1) NZ533042A (fr)
WO (1) WO2003050355A1 (fr)

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Publication number Priority date Publication date Assignee Title
FI115475B (fi) * 2002-10-24 2005-05-13 M Real Oyj Menetelmä paperin ja kartongin valmistamiseksi
WO2006019808A1 (fr) * 2004-07-14 2006-02-23 International Paper Company Procede de fabrication de papier
CN1303286C (zh) * 2005-06-20 2007-03-07 上海东升新材料有限公司 碳酸钙的包覆的纸浆纤维及其制备方法和在造纸中的应用
CA2547276A1 (fr) * 2006-05-19 2007-11-19 Abitibi-Consolidated Inc. Papier de pate mecanique couche
US7468101B2 (en) * 2006-08-17 2008-12-23 Specialty Minerals (Michigan) Inc. UV varnish gloss performance using novel pigment and process for making same
JP2008248417A (ja) * 2007-03-29 2008-10-16 Nippon Paper Industries Co Ltd 広葉樹機械パルプ
RU2499859C2 (ru) * 2008-09-09 2013-11-27 Омиа Девелопмент Аг Композиции карбоната кальция и пигментов для бумажных составов, посредством которых снижают степень пробивания оттиска
JP5462570B2 (ja) * 2008-09-30 2014-04-02 日本製紙株式会社 グラビア印刷用塗工紙およびその製造方法
JP5462572B2 (ja) * 2008-09-30 2014-04-02 日本製紙株式会社 印刷用塗工紙およびその製造方法
RU2412295C1 (ru) * 2010-05-20 2011-02-20 Эдуард Львович Аким Способ приготовления бумажной массы
CA2865647C (fr) 2012-03-23 2017-04-18 Omya International Ag Procede pour la preparation de carbonate de calcium precipite scalenoedrique
JP6077360B2 (ja) * 2012-03-30 2017-02-08 日本製紙株式会社 紙の製造方法
EP2855770B1 (fr) 2012-05-25 2017-07-12 Hewlett-Packard Development Company, L.P. Supports d'enregistrement non revêtus
US9068292B2 (en) 2013-01-30 2015-06-30 Hewlett-Packard Development Company, L.P. Uncoated recording media
SE539437C2 (en) * 2015-03-31 2017-09-19 Stora Enso Oyj A method of producing filler from fractionated fly ash
CN107663805B (zh) * 2017-10-11 2020-10-30 山东恒安纸业有限公司 一种无菌擦手纸及其生产工艺
CN111021126B (zh) * 2019-12-27 2022-06-07 民丰特种纸股份有限公司 一种低定量离型原纸及其制备方法
SE545321C2 (en) * 2021-03-10 2023-07-04 Stora Enso Oyj Metod for manufacturing a barrier film comprising highly refined cellulose

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Also Published As

Publication number Publication date
AU2002366533B2 (en) 2008-03-06
FI116573B (fi) 2005-12-30
CA2466899A1 (fr) 2003-06-19
NZ533042A (en) 2007-01-26
CN1596327A (zh) 2005-03-16
FI20012328A0 (fi) 2001-11-28
FI20012328L (fi) 2003-05-29
AU2002366533A1 (en) 2003-06-23
JP2005511916A (ja) 2005-04-28
WO2003050355A1 (fr) 2003-06-19
CN1309904C (zh) 2007-04-11
US20040256067A1 (en) 2004-12-23

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