EP1252392B1 - Papier non couche et produits carton - Google Patents

Papier non couche et produits carton Download PDF

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Publication number
EP1252392B1
EP1252392B1 EP00973302A EP00973302A EP1252392B1 EP 1252392 B1 EP1252392 B1 EP 1252392B1 EP 00973302 A EP00973302 A EP 00973302A EP 00973302 A EP00973302 A EP 00973302A EP 1252392 B1 EP1252392 B1 EP 1252392B1
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EP
European Patent Office
Prior art keywords
paper
board
calendering
nip
uncoated
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.)
Revoked
Application number
EP00973302A
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German (de)
English (en)
Other versions
EP1252392A1 (fr
Inventor
Sven Hakansson
Magnus WIKSTRÖM
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.)
Billerudkorsnaes Skog & Industri AB
Original Assignee
Korsnas AB
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Filing date
Publication date
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Application filed by Korsnas AB filed Critical Korsnas AB
Publication of EP1252392A1 publication Critical patent/EP1252392A1/fr
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • 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
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/04—Physical treatment, e.g. heating, irradiating

Definitions

  • the present invention relates to a new quality of uncoated paper and board products with a top layer of bleached chemical pulp.
  • the characteristic features of the new quality are low surface roughness, high gloss, and minimal gloss variations.
  • the paper and board products of the invention have a top surface that is highly suitable for printing, and the products are preferably used in the production of different kinds of packages.
  • the invention also relates to the production of the new products.
  • a characteristic feature of the top layer surface is that it resembles a coated rather than an uncoated product.
  • a suitable surface for printing of paper or board products is normally achieved by reduction of the surface roughness by calendering and/or by applying a pigmented coating layer to the surface and thereby obtaining a finer surface pore structure and surface topography compared to the uncoated surface.
  • a calendering operation is also performed after the coating operation to further improve the surface and increase the gloss.
  • non-renewable raw materials For resource saving and improved economics it is advantageous to reduce the amount of non-renewable raw materials needed for the production of a specific type of product (e.g. inorganic coating pigments and organic coating binders from oil-based raw materials).
  • a specific type of product e.g. inorganic coating pigments and organic coating binders from oil-based raw materials.
  • savings of non-renewable raw material should desirably be achieved without having to compromise with the quality requirements of the product, such as adequate bulk, stiffness, surface gloss and surface for printing.
  • the paper web is compressed in one or more roll nips, in most cases after the drying or the coating, in a calendering operation.
  • the thickness reduction, and the bulk deformation caused by the calendering are in the most cases regarded as drawbacks. It is therefore desirable to localise the deformation to the surface regions and minimise the deformation of the bulk structure.
  • the general idea is to create a surface layer which is softer and thus more deformable than the interior structure of the paper. A stiffness gradient in the thickness direction is then obtained and the compressive stress necessary to achieve a certain surface property, e.g. gloss, can then be reduced. A reduced compressive stress will partly retain the bulk structure (fibres and fibre network).
  • the most generally known possibility to obtain such a stiffness gradient in the thickness direction is to thermally soften the paper surface.
  • the paper is then compressed between two rolls, of which either one or both are heated to a high temperature (> 120°C).
  • the contact time in the nip is short, which results in surface regions of higher temperature than the bulk material.
  • the surface material e.g. fibres or coating binders
  • the principal technique is known as temperature-gradient calendering (Kerekes and Pye 1974, Crotogino 1982 and Vreeland 1986).
  • the softening of the paper surface region during temperature-gradient calendering can be referred to the thermal softening of the wood polymers; lignin, hemi-cellulose and cellulose.
  • the use of the temperature-gradient calendering may lead to a more non-uniform densification of the surface by introducing differences between the surface pore structure of the fibre floc areas and the areas in between the fibre flocs, i.e. in-plane variations in a macro-scale. If the stresses are concentrated to the denser part of the paper structure, unwanted inhomogeneities in the surface properties and mechanical properties may be introduced due to the calendering. Therefore the use of the temperature-gradient calendering in combination with comparatively hard nips is limited. In other words, the compression of fibre flocs and the areas in between the fibre flocs when calendering need to be balanced. The use of soft nips and especially extended soft nips provides a possibility to obtain such balance.
  • the local stress concentrations in the calender nip is substantially reduced with the extended soft nip.
  • the required smoothening of the paper surface can therefore be obtained with a minor or none increase of the local variations of the surface properties (Wikström et al. 1997) when coated paper webs are calendered.
  • Soft nips have been used in combination with high roll temperatures for a rather long time. For instance, Brecht and Müller (1968) soft calendered coated board and found that an increased roll temperature, up to 200 °C, improved the gloss and smoothness at the same bulk substantially.
  • the present invention provides uncoated paper and board products with a top layer of bleached chemical pulp and with a good surface for printing without compromising with other quality requirements.
  • the invention further provides the use of uncoated paper and board products in the production of packages.
  • the invention also provides a new step in a process of producing uncoated paper and board products to obtain the products of the invention.
  • the uncoated paper and board products of the invention are obtainable by a paper making process wherein a high degree of surface deformation on woodfree uncoated paper and board products are obtained at the same time as the uniformity of the paper structure is preserved.
  • the paper making process includes an extended soft nip (also named long nip) calendering technique with substantially higher calendering temperature than normally used, especially in the context of uncoated paper and board products with a surface layer of bleached chemical pulp.
  • the use of the extended soft calendering nip in combination with roll temperatures of 250 °C or more provides a possibility to achieve unique absolute values of surface properties (such as paper gloss, and PPS surface roughness) on uncoated paper and board products in only one nip passage, especially since the uniformity of the paper structure is preserved (low gloss variations, no blackening etc.).
  • one aspect of the invention is directed to an uncoated paper or board product of one or more layers with a top layer of bleached chemical pulp, wherein the top layer surface has a gloss value of 20 - 50 % measured according to Tappi T480, a coefficient of gloss variation in the wavelength region 3-30 mm of less than 5 %, and a surface roughness (PPS-10) of 2 - 5 ⁇ m, preferably 3 - 5 ⁇ m, measured according ISO 8791-4.
  • the coefficient of gloss variation may be measured by a method described by Bryntse and Norman (1976).
  • liquid board In two preferred embodiments of the products of the invention are a liquid board and a white top liner.
  • Another aspect of the invention is directed to the use of an uncoated paper or board product according to the invention in the production of packages.
  • Yet another aspect of the invention is directed to the paper making feature that in a process of producing an uncoated paper or board product according to the present invention, the calendering of the paper or board is performed with an extended soft nip calender which has a heated roll pressing against the top layer of the paper or board and has a surface temperature of 250 to 350 °C, and the pressure against the paper board is adjusted to 5 - 40 MPa depending on the line load, the properties of the calender belt and the length of the extended soft nip.
  • the heated roll is an internally induction heated metal roll and steam is applied to the paper or board surface immediately before the nip, on the side of the web that will be contacted by the heated roll.
  • the paper making process used to produce the products of the invention comprehends an extended soft nip calender wherein the metal roll can be heated to more than 250 °C by induction heating. With this arrangement a calendering result can be obtained that is more or less unique for an uncoated woodfree product, especially when considering that the web passes only one calendering nip.
  • the average gloss level can be increased with the extended soft nip with only a limited increase of the gloss variations.
  • the gloss variations remain more or less at the same level as for the uncalendered paper or increase only slightly when the extended soft nip is used, whereas using conventional soft nip or hard nips enhanced the gloss variations substantially at the same time as the average gloss level increases.
  • Figure 1 illustrates these findings, where uncoated bleached liquid board was calendered with an extended soft, conventional soft and hard nips. The same behaviour has been noted for the other grades tested.
  • the gloss variations are characterised with a method described by Bryntse and Norman (1976).
  • Figure 1 is a diagram wherein the gloss distribution (i.e. the local variations in gloss) is given as the coefficient of variation (wavelength region 3-30 mm) in gloss.
  • the average gloss (Tappi T-480) is also indicated (the unfilled circles).
  • the trial points represent different calendering conditions for the same set of uncoated bleached liquid board.
  • Test print results confirmed the good printing properties of the products of the invention.
  • the print was less mottled compared to uncoated references caelered in conventional ways with soft nips, probably due to the homogeneous surface structure and the decreased surface porosity. It is of great importance that the pore structure is rather homogeneous in order to avoid local variations in the ink absorption that causes print mottle.
  • the print gloss was higher compared to the references, which probably can be referred to a higher ink-holdout due to a more closed surface (decreased surface porosity).
  • the targeted calendering result i.e. products according to the invention, can be achieved with both types.
  • the shoe-belt nip described in detail elsewhere e.g. Turtinen and Tani 1998, Nahass and Crawford 1999.
  • the major part of the device consists of a stationary hydraulically-loaded concave press shoe and an endless polymer belt.
  • an intermediate layer in the form of an oil film, which dissipates the pressure force is used.
  • the length and shape of the press shoe is the dominating factors determining the nip length.
  • the roll-belt configuration is the second type of extended soft calender nip used (e.g. Neider and Rudt 1995).
  • the polymer belt is here supported by a routable steel roll instead of a stationary press shoe.
  • the extended nip length is determined mainly by the belt thickness and the compressive deformation behaviour of the polymer belt, which is significantly more deformable than a conventional backing roll cover.
  • a roll that stretches the belt and an alignment roll that controls the CD-position of the belt are other necessary components of this concept.
  • the static nip length is estimated to be about 35 mm with the extended soft nip.
  • Calendering rolls are normally heated by oil, water or steam flowing in peripherally drilled pipes through the shell of the roll.
  • internal induction heating has been used.
  • the heating is then generated by an electromagnetic field generated by inductions coils mounted inside the roll shell (Okamoto 1989 Tokuden, Kyoto, Japan).
  • Combinations of oil heated rolls and external induction heating may be an alternative way to obtain a roll surface temperature of 250 °C and more in this context. This possibility has however not been used in the above disclosed experiments.

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  • Paper (AREA)

Abstract

L'invention concerne une nouvelle qualité de papier non couché et de produits carton, tel que du carton liquide ou une garniture supérieure blanche, comprenant au moins une couche supérieure de pâte blanchie chimiquement. La surface de la couche supérieure présente une valeur de brillant de 20-50 %, un coefficient de variation de brillant dans la région de longueur d'onde de 3-30 mm de moins de 5 %, et une rugosité de surface (PPS-10) de 2-5 νm. La bonne aptitude à l'impression des produits précités permet de les utiliser pour produire des emballages. On peut obtenir lesdits produits à l'aide d'un procédé de fabrication de papier, le calandrage du papier ou du carton étant exécuté à l'aide d'une calandre douce à zone de pression étendue chauffée, par exemple par induction interne, associée à un rouleau à température de surface de 250 à 350 °C, appliquant une pression de 5-40 MPa sur le papier. L'opération de calandrage est éventuellement précédée d'une application de vapeur sur la couche supérieure de la bande de papier ou de carton.

Claims (8)

  1. Produit de papier non couché ou de carton d'une ou plusieurs couches avec une couche supérieure de pâte chimique et blanchie, caractérisé en ce que la surface de la couche supérieure présente une valeur de brillance comprise entre 20 et 50% mesurée selon la norme de Tappi T480, un coefficient de variation de brillance dans la région de longueur d'onde comprise entre 3 et 30 mm de moins de 5%, et une rugosité de surface (PPS-1 0) comprise entre 2 et 5 µm mesurée selon la norme d'ISO 8791-4.
  2. Produit de papier non couché ou de carton selon la revendication 1, dans lequel la rugosité de surface (PPS-10) est comprise entre 3 et 5 µm mesurée selon la norme ISO 8791-4.
  3. Produit de papier non couché ou de carton selon la revendication 1 ou 2, dans lequel le produit est un carton de liquide.
  4. Produit de papier non couché ou de carton selon la revendication 1 ou 2, dans lequel le produit est un revêtement supérieur blanc.
  5. Utilisation d'un produit de papier ou de carton selon l'une quelconque des revendications 1 à 4 dans la production d'emballages.
  6. Dans un procédé de production d'un produit de papier non couché ou de carton selon la revendication 1, le calandrage du papier ou du carton est réalisé avec une calandre à pincement étendu doux qui a un rouleau chauffé en appui contre la couche supérieure du papier ou du carton et présente une température de surface comprise entre 250 et 350°C, et la pression contre le carton de papier est ajustée jusqu'à 5 à 40 MPa en fonction de la charge de ligne, des propriétés de la courroie de calandre et de la longueur du pincement étendu doux.
  7. Dans un procédé selon la revendication 6, le rouleau chauffé est un rouleau métallique chauffé par l'induction intérieure.
  8. Dans un procédé selon la revendication 6 ou 7, la vapeur est appliquée sur la surface du papier ou du carton, immédiatement avant le pincement, sur le côté de la bande qui sera en contact avec le rouleau chauffé.
EP00973302A 1999-10-19 2000-10-17 Papier non couche et produits carton Revoked EP1252392B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9903764A SE516821C2 (sv) 1999-10-19 1999-10-19 Obestruken pappers- eller kartongprodukt och förfarande för framställning därav
SE9903764 1999-10-19
PCT/SE2000/002006 WO2001029316A1 (fr) 1999-10-19 2000-10-17 Papier non couche et produits carton

Publications (2)

Publication Number Publication Date
EP1252392A1 EP1252392A1 (fr) 2002-10-30
EP1252392B1 true EP1252392B1 (fr) 2012-08-15

Family

ID=20417406

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00973302A Revoked EP1252392B1 (fr) 1999-10-19 2000-10-17 Papier non couche et produits carton

Country Status (12)

Country Link
EP (1) EP1252392B1 (fr)
JP (1) JP5068407B2 (fr)
CN (1) CN1246528C (fr)
AU (1) AU1182901A (fr)
BR (1) BR0014845B1 (fr)
CA (1) CA2387739C (fr)
DK (1) DK1252392T3 (fr)
ES (1) ES2393100T3 (fr)
PT (1) PT1252392E (fr)
SE (1) SE516821C2 (fr)
WO (1) WO2001029316A1 (fr)
ZA (1) ZA200202853B (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE0102941D0 (sv) * 2001-09-05 2001-09-05 Korsnaes Ab Publ Uncoated paperboard for packages
EP2050869B1 (fr) * 2002-01-29 2014-12-31 Valmet Technologies, Inc. Papier de sécurité
DE20221930U1 (de) * 2002-06-24 2009-05-20 Voith Patent Gmbh Maschine zur Behandlung einer Materialbahn vorzugsweise aus Papier und Karton sowie gegebenenfalls zur der Behandlung vorausgehenden Herstellung der Materialbahn, mit einer Kontaktlos-Auftragseinrichtung und einer Materialbahnglättungseinrichtung
DE20221941U1 (de) * 2002-06-24 2009-07-16 Voith Patent Gmbh Maschine zur Herstellung und Behandlung einer Materialbahn mit einer wenigstens ein Kontaktlos-Auftragswerk aufweisenden Auftragseinrichtung
JP4886180B2 (ja) * 2004-06-21 2012-02-29 大王製紙株式会社 情報記録用紙
WO2006039118A1 (fr) * 2004-09-29 2006-04-13 Meadwestvaco Corporation Carton a partie superieure blanche
FI119251B (fi) * 2005-05-25 2008-09-15 Metso Paper Inc Menetelmä ja laite korkeassa sakeudessa rainatun kuiturainan valmistamiseksi
US20080230001A1 (en) 2006-02-23 2008-09-25 Meadwestvaco Corporation Method for treating a substrate
GB2449922A (en) * 2007-06-08 2008-12-10 Arjowiggins Licensing Sas Base paper

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2930776B2 (ja) * 1991-06-14 1999-08-03 日本製紙株式会社 グラビア用紙の製造方法及び該方法により得られたグラビア用紙
JP3058482B2 (ja) * 1991-06-14 2000-07-04 日本製紙株式会社 連続伝票用紙の製造方法及び連続伝票用紙
US5400707A (en) * 1992-10-09 1995-03-28 Champion International Corporation Apparatus for finishing a continuous sheet of paper
FI95061C (fi) * 1993-03-08 1995-12-11 Valmet Paper Machinery Inc Menetelmä paperiradan kalanteroinnissa ja menetelmää soveltava kalanteri
SE502960C2 (sv) * 1994-06-15 1996-02-26 Nordiskafilt Ab Albany Arrangemang för kalandrering
SE9500949L (sv) * 1995-03-16 1996-07-08 Korsnaes Ab Bestruken kartong för formade artiklar, produktionslinje för produktion av bestruken kartong, förfarande för framställning av bestruken kartong samt sätt att minska sprickbildningsbenägenheten vid vikning av en bestruken kartong
JP3575116B2 (ja) * 1995-06-30 2004-10-13 日本製紙株式会社 印刷用紙及びその製造法
FI102305B (fi) * 1997-04-02 1998-11-13 Valmet Corp Kalanterointimenetelmä ja menetelmää soveltava kalanteri
FI115985B (fi) * 1997-10-14 2005-08-31 Metso Paper Inc Pidennetyllä nipillä varustettu kalanteri
AU9127698A (en) * 1997-10-31 1999-05-24 Beloit Technologies, Inc. Soft nip calender
JP3931423B2 (ja) * 1998-03-30 2007-06-13 日本製紙株式会社 シート状物のカレンダ処理用試験方法とその装置
JP2000073291A (ja) * 1998-08-20 2000-03-07 Nippon Paper Industries Co Ltd 紙のカレンダー処理方法及びその装置

Also Published As

Publication number Publication date
JP2003512543A (ja) 2003-04-02
EP1252392A1 (fr) 2002-10-30
PT1252392E (pt) 2012-11-27
SE516821C2 (sv) 2002-03-05
CN1387599A (zh) 2002-12-25
JP5068407B2 (ja) 2012-11-07
CN1246528C (zh) 2006-03-22
DK1252392T3 (da) 2012-10-22
CA2387739C (fr) 2010-07-20
SE9903764L (sv) 2001-04-20
ES2393100T3 (es) 2012-12-18
SE9903764D0 (sv) 1999-10-19
CA2387739A1 (fr) 2001-04-26
WO2001029316A1 (fr) 2001-04-26
BR0014845A (pt) 2002-07-02
AU1182901A (en) 2001-04-30
BR0014845B1 (pt) 2011-01-25
ZA200202853B (en) 2003-06-25

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