WO2002072954A1 - Procede de production de papier ou de carton et papier ou carton produit au moyen de ce procede - Google Patents

Procede de production de papier ou de carton et papier ou carton produit au moyen de ce procede Download PDF

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Publication number
WO2002072954A1
WO2002072954A1 PCT/IB2002/000772 IB0200772W WO02072954A1 WO 2002072954 A1 WO2002072954 A1 WO 2002072954A1 IB 0200772 W IB0200772 W IB 0200772W WO 02072954 A1 WO02072954 A1 WO 02072954A1
Authority
WO
WIPO (PCT)
Prior art keywords
coating
paperboard
paper
mechanical pulp
colour
Prior art date
Application number
PCT/IB2002/000772
Other languages
English (en)
Inventor
Markku Hämäläimen
Risto Mänttäri
Tuula Sokka
Johanna Nieminen Kelavirta
Hans Schauman
Original Assignee
Metso Paper, Inc.
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 Metso Paper, Inc. filed Critical Metso Paper, Inc.
Priority to DE10296510T priority Critical patent/DE10296510T5/de
Publication of WO2002072954A1 publication Critical patent/WO2002072954A1/fr
Priority to FI20031291A priority patent/FI20031291A/fi

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
    • 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
    • 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
    • D21H11/10—Mixtures of chemical and mechanical 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/385—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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/50—Proteins

Definitions

  • the present invention relates to a method in connection with the production of coated paper or paperboard comprising a base paper or paperboard which to more than 50% dry weight consists of mechanical pulp, and paper or paperboard products produced according to the method.
  • paper or paperboards are coated with various coating materials.
  • aqueous suspension containing coating colour is applied onto one or both sides of the paper or paperboard web and the grammage of the coating is controlled using either blade, roller, or airbrush.
  • the coated paper web is then subject to drying followed by subsequent treatments, for instance, calendering.
  • calendering As the conventional techniques all require direct contact of the coating device with the paper or paperboard web, a high strength of the web is necessary for machine runnability.
  • Web breakage in the coating section due to strength failure is the most common reason for production stops, especially when coating is an on-line operation in conjunction to the paper or paperboard machine. For this reason, coating has been mainly limited to paper or paperboard grades with relatively strong pulp fiirnish, typically so-called woodfree grades having chemical pulp as the major component.
  • woodfree grades typically so-called woodfree grades having chemical pulp as the major component.
  • a high percentage of the pulp furnish usually 50%, has to be constituted with so-called reinforcement pulp which is a chemical pulp much stronger than mechanical pulp both in dry and wet strength, however much more expensive.
  • mechanical pulp is not only more economical in production and more environmentally friendly, but also superior in printing properties compared to chemical pulp. There is therefore a great incentive to maximize the use of mechanical pulp in coated grades, provided obstacles such as breakage problems can be handled properly.
  • moisture content of the base paper or base paper- board is a key parameter.
  • Strength of the paper web decreases rapidly with moisture content. If the moisture content is too high entering the coating unit, or the moisture content is drastically increased upon contact with the aqueous coating colour, breaking of the web may occur thus jeopardising the coating operation.
  • the mill In addition to intermediate drying of the base paper or base paperboard, the mill has to find a compromise between, on one hand, as high as possible a solid content of the coating colour and, on the other hand, an appropriate viscosity of the coating colour. Too high a viscosity at increasing solid content leads to inferior coating quality and also increases the risk of worn-out of the coating device.
  • a spray coating technique provides new means for the coating of paper and paperboard.
  • the technique is characterized by non-contacting application of an aerosol of coating material on the web surface, generated in arrayed nozzles at high pressure in a closed chamber.
  • the present invention utilises the spray coating technique according to US 4,944,960 and US 5,633,044 in the production of coated paper and paperboard comprising a base paper or paperboard which to more than 50% dry weight consists of mechanical pulp as defined in present claim 1.
  • mechanical pulp is meant either SGW (stone ground- wood pulp), PGW (Pressurized stone groundwood pulp), SPGW (Super-pressurized stone groundwood pulp), RMP (refiner mechanical pulp), TMP (thermo mechanical pulp), CTMP (chemi-thermo mechanical pulp), or recycled mechanical pulp of any sort, or a combination of the said mechanical pulps.
  • said base paper or paperboard to more than 60% dry weight, preferably more than 70% dry weight and even more preferred to more than 80% dry weight consists of mechanical pulp.
  • the cellulose raw material used is preferably hardwood and/or softwood, although other raw materials are conceivable.
  • the objective of the present invention is to produce coated paper or paperboard mainly based on mechanical pulp with a minimum use of reinforcement chemical pulp, thus achieving better production economy and at the same time improving the product properties such as printability that are favoured by the use of mechanical pulps.
  • Another objective of the present invention is to reduce the demand of drying either of the base paper prior to the coating operation or of the coated paper after the coating operation.
  • Yet another objective of the present invention is to find a more economical recipe/composition for the coating colour, as conventional techniques require high solid content in the coating colour, which both limits the choice of coating pigments and demands special treatment of the coating mixture with for instance dispersing agents.
  • a paper web comprising as low as down to 10% reinforcement chemical pulp can be successfully coated with the spray coating technique.
  • the strength property of the coated products is fully acceptable according to pilot trials in respect to runnability and is comparable to similar products produced with conventional techniques but having 50% reinforcement pulp.
  • the term paper web means uncoated base paperboard.
  • a base paper or paperboard having moisture contents of as high as up to 25%, preferably up to 15% can be coated without causing runnability problems in the coating operation because of the non-contacting coating operation.
  • the high moisture content does not adversely affect the coating quality after drying and supercalendering.
  • Hydrophobic treatment with sizing agents such as alkenyl succinic acid anhydride (ASA) or alkyl keten dimer (AKD), starch or other polymer based sizing agents, in amounts of 0.1-3 %, preferably 0.1-1 % and even more preferred 0.1-0.5 % of total furnish weight for the paper or paperboard gives further improvement of the results.
  • sizing agents such as alkenyl succinic acid anhydride (ASA) or alkyl keten dimer (AKD), starch or other polymer based sizing agents, in amounts of 0.1-3 %, preferably 0.1-1 % and even more preferred 0.1-0.5 % of total furnish weight for the paper or paperboard gives further improvement of the results.
  • Other additives such as wet strength agents for instance can also be added to the pulp furnish to further improve machine runnability and product properties.
  • the present invention further shows that the coating pigment, the major component in the composition, can be totally or partially substituted by low-cost fillers consisting of calcium carbonate.
  • the total content of calcium carbonate, filler grade or coating grade can amount to at least 80%, preferably at least 90%, and up to 100% of the total pigment used for coating.
  • the high amount of calcium carbonate results in higher brightness of the coated products, as compared to coating recipes with large amount of kaolin.
  • the non-contacting spray technique according to the present invention the penetration of coating colour into the base paper substrate is lower than with conventional contacting technique, the water retention by the base paper is reduced which allows for lower solid content of the coating colour.
  • a solid content of 40-60%, preferably 45-55% can be used without causing any operation problems in coating, or mottling problems in the coated products.
  • the low viscosity at relatively low solid content allows for the addition of , synthetic thickeners, preferably in an amount of 0.5-2% based on the coating colour weight, with the purpose of increasing the pore volume and hence the bulkiness of the coating layer of the coated surface, without risking poorer runnability due to too high a viscosity caused by the additives.
  • the coating composition may comprise protein, preferably soy protein, in an amount of 0.5-3% based on the coating colour weight.
  • carbon dioxide gas can be mixed and dissolved into the coating colour suspension. This has the effects of improving the evenness of the coating layer on the paper surface, as well as stabilizing the coating pigment that to a large extent consists of calcium carbonate.
  • the coating layer has hence better stability and tenacity in the press room upon contact with acidic dampening water used in printing on the press machine.
  • the coating is applied to provide coat weights with a grammage lower than 10 g/m 2 , preferably lower than 8 g/m 2 and even more preferred lower than 6 g/m 2 , but at least 2 g/m 2 , on one or both sides of the base paper or paperboard.
  • the coating is performed by use of one or a number of nozzle zones inside the closed coating chamber.
  • different coating colour compositions may beneficially be used in the different nozzle zones, in order to optimise the coating.
  • the coating may be performed, simultaneously or in different steps, on one or both sides of the paper or paperboard, as single or multi-ply coating.
  • the coating stage may be performed in a paper or paperboard machine operated in a so-called on-line mode, or it may be performed in a so-called off-line coating which is physically separated from the paper or paperboard machine.
  • Fig. 1 is showing tensile index for different base papers used in the trial series 1,
  • Fig. 2 is showing tear index for the different base papers
  • Fig. 3 is showing tensile index for the different coated papers
  • Fig. 4 is showing tear index for the different coated papers
  • Fig. 5 is showing opacity for the different base papers and coated papers
  • Fig. 6 is showing brightness for the different base papers and coated papers
  • Fig. 7 is showing print gloss for the different coated papers
  • Fig. 8 is showing opacity for the coated papers of trial series 2
  • Fig. 9 is showing brightness for the coated papers of trial series 2.
  • Trial series 1 Base paper with different pulp furnish
  • Table 1 Shown in Table 1 are the base paper furnish and coating colour composition for seven different samples in trial series 1.
  • the pigment used in this trial series was a coating grade calcium carbonate. The coat weight was about 10 g/m 2 on each side of the base paper.
  • a blade-coated paper with a base paper furnish of 50% chemical pulp and 50% groundwood pulp was chosen, sample 7.
  • the coating pigment for the reference consisted of 70% kaolin and 30% calcium carbonate, both of coating grade. Because of the poor strength property, only spray coating was performed on the mechanical pulp based samples 1-6 (inventive). Note that there was a small amount of fillers in the mechanical pulp based base papers. This presumably further weakened the base paper. The spray coating operation was performed on a pilot spray-coating machine.
  • the base paper had a grammage of about 42 g/m 2 for samples 1-3, and 45 g/m 2 for samples 4-7. After coating the grammage was about 62 and 65 g/m 2 , respectively.
  • the composition gives by custom the dry amounts of various components of coating colour relative to the dry amount of pigment, which is given the number 100. If the pigment consists of more than one component then the sum must be 100.
  • Raisafob and OBA manufactured by Raisio Chemicals, Hydrocarb CC and Hydrocarb FF are manufactured by Omya AG
  • Latex SB 330 is manufactured by Latexia SB
  • Nopcote C-104 is manufactured by Henkel Nopco Oy
  • Bacote is manufactured by HCI Nordic Oy.
  • the opacity of the coated papers was higher for the spray-coated mechanical pulp based samples. This is mainly due to the high amount of mechanical pulp in the base paper furnish resulting in higher opacity.
  • the brightness and print gloss were lower for the spray-coated mechanical pulp based samples, the increase in brightness after coating was much more pronounced for the mechanical pulp based samples. The difference after coating was thus to a large degree minimized.
  • the brightness of coated paper with higher amount of mechanical pulp (samples 4-6) could be increased to the brightness level around 75% ISO. Addition of thickener in the coating colour significantly improved the brightness and printed gloss, Figures 6-7.
  • Trial series 2 Moisture content in the base paper and new pigment of filler grade Having established, in trial series 1, that a coated paper mainly based on mechanical pulp can be produced with spray coating technique, a new trial series with a filler grade calcium carbonate pigment (Hydrocarb FF, Table 2) was performed to study the influences of moisture content on the coating operation and coating quality.
  • the base paper consisted of 90% mechanical pulp and 10% chemical pulp.
  • FIGS 8-9 there is shown the results for spray coated paper according to: sample A denotes spray coated paper at 10% moisture content, sample B at 15% moisture content, sample C at 10% moisture content with super calendering, sample D at 15% moisture content with super calendering, sample E at 10% moisture content with soft calendering, sample F at 15% moisture content with soft calendering.
  • sample A denotes spray coated paper at 10% moisture content
  • sample B at 15% moisture content
  • sample C at 10% moisture content with super calendering
  • sample D at 15% moisture content with super calendering
  • sample E at 10% moisture content with soft calendering
  • sample F at 15% moisture content with soft calendering.
  • the trial series was successful with moisture content 10% and 15%, which are considered high for base paper.
  • the moisture content of 15%> had no negative effect compared to 10% moisture content.
  • the coating operation is thus characterized as wet on wet - coating without any intermediate drying.

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  • Paper (AREA)

Abstract

Procédé de production continue de papier ou de carton couché contenant une base de papier ou de carton dont une quantité supérieure à 50 % en poids sec est constituée par de la pulpe mécanique. On applique une couleur de revêtement sur un ou sur les deux côtés du papier ou du carton de base, sous forme d'un aérosol pulvérisé par un ensemble d'ajutage dans une chambre de revêtement fermée. L'invention concerne également le papier ou le carton obtenu au moyen de ce procédé.
PCT/IB2002/000772 2001-03-13 2002-03-12 Procede de production de papier ou de carton et papier ou carton produit au moyen de ce procede WO2002072954A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE10296510T DE10296510T5 (de) 2001-03-13 2002-03-12 Verfahren in Verbindung mit der Herstellung von Papier oder Pappe und ein demgemäss hergestelltes Papier oder eine Pappe
FI20031291A FI20031291A (fi) 2001-03-13 2003-09-10 Menetelmä paperin tai kartongin valmistuksen yhteydessä ja sen mukaisesti valmistettu paperi tai kartonki

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0100851A SE0100851L (sv) 2001-03-13 2001-03-13 Metod vid tillverkning av papper eller kartong och ett papper eller en kartong som tillverkats därigenom
SE0100851-5 2001-03-13

Publications (1)

Publication Number Publication Date
WO2002072954A1 true WO2002072954A1 (fr) 2002-09-19

Family

ID=20283323

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2002/000772 WO2002072954A1 (fr) 2001-03-13 2002-03-12 Procede de production de papier ou de carton et papier ou carton produit au moyen de ce procede

Country Status (4)

Country Link
DE (1) DE10296510T5 (fr)
FI (1) FI20031291A (fr)
SE (1) SE0100851L (fr)
WO (1) WO2002072954A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4944960A (en) * 1988-09-23 1990-07-31 Sundholm Patrick J Method and apparatus for coating paper and the like
US5622599A (en) * 1994-06-28 1997-04-22 Sproule; Barry Method and apparatus for coating pulp products
US5633044A (en) * 1994-07-01 1997-05-27 Valmet Corporation Method and apparatus for spray-coating a paper or board web
EP0838551A1 (fr) * 1996-10-28 1998-04-29 Valmet Corporation Méthode et dispositif pour enduire une bande de papier ou de carton en mouvement
EP0908557A1 (fr) * 1997-09-16 1999-04-14 Metsä-Serla Oy Papier et un procédé de sa fabrication
US5976635A (en) * 1994-06-17 1999-11-02 Valmet Corporation Method for coating a paper or board web

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4944960A (en) * 1988-09-23 1990-07-31 Sundholm Patrick J Method and apparatus for coating paper and the like
US5976635A (en) * 1994-06-17 1999-11-02 Valmet Corporation Method for coating a paper or board web
US5622599A (en) * 1994-06-28 1997-04-22 Sproule; Barry Method and apparatus for coating pulp products
US5633044A (en) * 1994-07-01 1997-05-27 Valmet Corporation Method and apparatus for spray-coating a paper or board web
EP0838551A1 (fr) * 1996-10-28 1998-04-29 Valmet Corporation Méthode et dispositif pour enduire une bande de papier ou de carton en mouvement
EP0908557A1 (fr) * 1997-09-16 1999-04-14 Metsä-Serla Oy Papier et un procédé de sa fabrication

Also Published As

Publication number Publication date
SE0100851D0 (sv) 2001-03-13
FI20031291A (fi) 2003-09-29
SE0100851L (sv) 2002-09-14
DE10296510T5 (de) 2006-02-23

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