WO2004033792A1 - Procede de production de papier ou de carton, et produit obtenu suivant ce procede - Google Patents

Procede de production de papier ou de carton, et produit obtenu suivant ce procede Download PDF

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Publication number
WO2004033792A1
WO2004033792A1 PCT/FI2003/000745 FI0300745W WO2004033792A1 WO 2004033792 A1 WO2004033792 A1 WO 2004033792A1 FI 0300745 W FI0300745 W FI 0300745W WO 2004033792 A1 WO2004033792 A1 WO 2004033792A1
Authority
WO
WIPO (PCT)
Prior art keywords
web
size
furnish
sides
product
Prior art date
Application number
PCT/FI2003/000745
Other languages
English (en)
Inventor
Juha Lipponen
Johan Grön
Erkki Ilmoniemi
Kaarlo Lackman
Pekka Pakarinen
Kari Juppi
Pasi Ahonen
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
Priority claimed from FI20021804A external-priority patent/FI20021804A0/fi
Application filed by Metso Paper, Inc. filed Critical Metso Paper, Inc.
Priority to US10/530,629 priority Critical patent/US20060027348A1/en
Priority to AU2003271046A priority patent/AU2003271046A1/en
Priority to JP2004542530A priority patent/JP2006502317A/ja
Priority to DE10393449T priority patent/DE10393449T5/de
Publication of WO2004033792A1 publication Critical patent/WO2004033792A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • 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
    • D21H21/16—Sizing or water-repelling agents
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
    • G03G7/0006—Cover layers for image-receiving members; Strippable coversheets
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
    • G03G7/006—Substrates for image-receiving members; Image-receiving members comprising only one layer
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
    • G03G7/006—Substrates for image-receiving members; Image-receiving members comprising only one layer
    • G03G7/0066—Inorganic components thereof
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
    • G03G7/006—Substrates for image-receiving members; Image-receiving members comprising only one layer
    • G03G7/0073—Organic components thereof
    • 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
    • D21H23/24—Addition to the formed paper during paper manufacture
    • D21H23/26—Addition to the formed paper during paper manufacture by selecting point of addition or moisture content of the paper
    • 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/14—Paper having stable form or dimension; Curl-resistant paper

Definitions

  • the present invention relates to a method according to the preamble of claim 1 for manufacturing paper and paperboard products, the method comprising the steps of monitoring web formation during the manufacturing process and surface sizing the web at least on one side.
  • the method also allows the control of curl in the manufactured product.
  • the invention also relates to a product manufactured by virtue of the method.
  • the function of surface sizing is to improve the surface qualities of a product, where size also improves the internal strength of the web.
  • the size furnish In order to additionally improve the internal strength of the web by sizing, the size furnish must have a high water content to make the furnish penetrate deep into the web. As a result, a high drying capacity is needed, even further accentuated by the fact that water is the more difficult to remove the deeper the penetration of water into the web. Hence, drying of surface size makes up a substantial portion of the drying capacity that must be used.
  • sheet curl can be managed today by using a twin-felted run system on the post-dryer section or, alternatively, treating the underside of the web with water and steam on single-felted runs.
  • twin-felted system In a twin-felted system, symmetrical drying can be attained by proper adjustment of steam pressures on the upper and lower cylinders. Inasmuch as heat in a single-felted system is introduced to the web via one side only and evaporation can take place principally only from the same side (bottom side), the paper or paperboard web tends to billow out toward the top side. For a two-sided paper, a simple rule to remember is that curl occurs toward the side drying last. While the same rule applies to both twin-felted and single-felted runs, the effect is less pronounced on twin-felted runs.
  • the goal of the invention is achieved by way of keeping the speed differential, or the draw, between the press section and the dryer section of the paper/paperboard making machine lower than 3 % and performing surface sizing with a size furnish wherein the proportion of size solids is at least 15 %.
  • the invention offers significant benefits.
  • the internal bond strength Hydrogen
  • work-to-rupture and breaking elongation increase while web porosity decreases.
  • surface sizing need not be used for increasing the internal bond strength of the product, but rather, size furnishes of higher solids can be used, whereby the size remains on the web surface.
  • a web structure is attained having the size layers coating the product surfaces and the base sheet acting as a middle layer in the same fashion as in a composite structure. The outcome is a very stiff product in regard to its basis weight.
  • Such a product is well suited for use as a copier paper or, if manufactured as a paperboard grade, as a packaging cardboard.
  • the tensile strength of the web remains substantially equal in both the cross-machine and machine directions. In the perpendicular direction (z-direction) to the paper surface, the breaking elongation and the work-to-rupture increase.
  • the amount of water imported to the web is reduced with the immediate result that less drying capacity is needed in the process. This benefit is further accentuated by the lesser absorption of water into the web.
  • the surface size furnish may be complemented with other additives such a brightener or pigment particles. Particularly the use of a brightener has been found advantageous. As the surface size remains on the surface of the web, the consumption of possible additives is small because no loss of additives via absorp- tion into the base sheet takes place. Hence, more liberal use of expensive additives may be considered, too.
  • the method according to the invention increases the whiteness of the product, which is in contrast to the traditional belief in the art that the use of a brightener is detrimental to product whiteness.
  • the product according to the invention is well suited for use in ink-jet printing and similar hardcopy processes, because the ink cannot excessively penetrate into the fibers and interfiber voids, whereby the contours of ink spots and printed patterns become sharply defined.
  • Control of web curl can be managed by virtue of the method according to the invention either via changing the amount of surface size application or the water content of the surface size furnish.
  • the sized sheet acts like a layered composite structure in which the surface sized top/bottom layers serve as the shell element. This shell element gives a vital contribution to the flexural stiffness of the sheet and, thereby, to. the web curl.
  • the method according to the invention offers efficient tools to the control of web curl.
  • control of curl can be still further essentially improved over the prior art by virtue of using different size furnishes on the two sides of the web, whereby for instance the solids of the two sides can be adjusted different from each other.
  • the effect on absorption is such that absorption on the bottom side of the web increases inasmuch a larger amount of water is applied thereon by virtue of the web curl control system.
  • the paper grade of the example is well suited for use as copier or printer paper.
  • copier equipment manufacturers recommend the use of a copier paper grade having a basis weight of 80 g/m .
  • This recommendation aims to secure a sufficient sheet stiffness in the infeed and printing sections of copier/printer equipment.
  • this kind of paper is surface sized using a furnish having a solids content of about 10 % and applied, e.g., 10 g/m 2 as a wet film on both sides of the web. Then, the portion of dry weight of size solids is 2 g/m 2 , whereby the basis weight of the base sheet must be 78 g/m 2 .
  • the internal bond strength is secured by keeping the draw between the press section and dryer section of the papermaking machine lower than 3 %, advantageously in the range 1 - 2%, whereby the internal bond strength required from the base sheet stays good. If the basis weight of the base sheet is lowered to a value of 68 - 72 g/m 2 , the computational value of product stiffness reduction is 15 — 25 %. This stiffness reduction due to thinner base sheet is compensated for by using in surface sizing a furnish of 25 % solids in the dry weight of the size, whereby the product has a sufficient stiffness and at least equal surface qualities as those of a comparative product surface sized with a smaller amount of size.
  • the dry solids of the size is defined as the proportion of the actual solids of the size in regard to the amount of water in the furnish. While the overall solids of the furnish may be increased substantially for instance when using pigment additives, at the lower end of solids content the proportion of size components in the total amount of size material and water should not be less than 15 % to avoid excessive penetration of size furnish into the interfiber voids.
  • the size solids is at least 20 %, most advantageously 25 %.
  • the total amount of applied size may be equal to the layer weight when size is applied using a furnish of less solids, but in the case that the product basis weight is precisely specified, e.g.
  • the amount of size may be increased.
  • the invention makes it possible to optimize the consumption of raw materials and, particularly, the product stiffness.
  • the contribution of the size layer to the product stiffness is substantial, whereby the product stiffness can be modified easier by changing the applied size weight than by using a base sheet of different basis weight.
  • the surface size is not necessary to increase the internal bond strength of the base sheet, the properties of the size can be fully utilized to improve the surface qualities and stiffness of the paper product.
  • the invention is particularly suited for manufacturing copier and ink-jet printer paper grades, it may also be utilized in other kinds of products specified for a good ratio of stiffness to basis weight, even in packaging cardboard grades.
  • the surface size furnish may be prepared based on some other liquid than water, whereby the proportions of size components must be computed relative to the total volume of liquid.
  • the goal is to keep the size in the coat layer of the product and the penetration into the interfiber voids must be minimal.
  • at least 80 %, advantageously 90 %, of the total amount of applied size shall remain on the base sheet fiber layer.
  • the increase of solids in the surface size furnish allows the top and bottom sides of the web to be coated with the same amount of size but in different amounts solids, whereby the amounts of water applied to the two sides of the web may be varied widely.
  • the size solids can be varied in a range as wide as 8 to 30 %. If the solids of the dried size is adjusted to 1.5 g/m , it means that the amount of water applied to the web is 3.5 g/m 2 minimum and 17.3 g/m 2 maximum. Obviously, the range of allowable water application is really wide. Inasmuch this difference in the amount of water applied to the two sides of web makes it possible to efficiently control the tendency of the web to curl after drying, whereby the curl of the paper web is maximally easy to manage.
  • aqueous furnish of surface size containing water in such an amount that the solids content of a web of 70 g/m 2 basis weight falls from 97 % to about 70 %, whereby the web contains 30 g/m 2 water distributed essentially uniformly over the cross-machine direction of the web. Removal of this excess moisture content from the web requires plural dryer cylinders. If the dryer construction is based on single-felted runs, a moisture content gradient is formed when the bottom side dries first, whereby the web is subjected to internal stresses that force the web to billow out toward its top surface.
  • a feasible arrangement could be such that, for instance: size furnish is applied on both the top surface and the bottom surface by the same amount of 1.5 g/m 2 furnish having different solids contents so that the dry solids of the bottom side furnish is 10 % while 25 % dry solids is applied to the top side.
  • the corresponding amounts of imported water are 13.5 g/m 2 and 3.5 g/m 2 .
  • the moisture content to be removed from the bottom side is more than three times greater than the moisture content evaporating from the web top side.
  • a radical change takes place in the distribution of evaporation in a single-felted dryer group. Due to the substantially smaller amount of moisture being evaporated via the top surface, the web curl may be expected to be reduced and even change its billowing direction if the difference between the amounts of water applied to the top and bottom sides of the web is adjusted sufficiently large.
  • the solids content of the web will be 80.5 % which is substantially more than 70 % conventionally used in the art. Also the number of required dryer cylinders is reduced. For instance, on a papermaking machine having 12 cylinders in a single- felted run, the drying process is as follows: the two last cylinders of the dryer group are cooling cylinders and a surplus amount 1 g/m water is imported to the web at the end of the dryer section.
  • the reduction in the amount of imported water is about 43 % in regard to the conventional level (30 g/m 2 vs. 17 g/m 2 ).
  • the number of dryer cylinders can be reduced by about 40 % as compared with the prior art.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un procédé et un dispositif pour la fabrication d'une feuille continue de papier ou de carton, procédé caractérisé en ce qu'on forme tout d'abord une feuille de base qui est séchée dans la section de pressage de la machine à papier, en ce que la feuille de base est ultérieurement séchée dans la section de séchage de la machine à papier, en ce qu'une vitesse de cette feuille, différentielle ou en tirage, est réglée entre la section de pressage et le premier groupe de rouleaux sécheurs de la section de séchage, et en ce qu'on effectue un collage en surface sur au moins une surface de la feuille. Le tirage est réglé à 3 % maximum et l'on applique une charge de collage en surface ayant une teneur en matières solides d'au moins 15 % de la quantité totale de composants de collage et de liquide dans la charge.
PCT/FI2003/000745 2002-10-09 2003-10-08 Procede de production de papier ou de carton, et produit obtenu suivant ce procede WO2004033792A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US10/530,629 US20060027348A1 (en) 2002-10-09 2003-10-08 Method for producing paper or board and a product produced by the method
AU2003271046A AU2003271046A1 (en) 2002-10-09 2003-10-08 Method for producing paper or board and a product produced by the method
JP2004542530A JP2006502317A (ja) 2002-10-09 2003-10-08 紙又は板紙を製造する方法及びその方法によって製造される製品
DE10393449T DE10393449T5 (de) 2002-10-09 2003-10-08 Verfahren zur Herstellung von Papier oder Karton, und mit dem Verfahren hergestelltes Produkt

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FI20021804 2002-10-09
FI20021804A FI20021804A0 (fi) 2002-10-09 2002-10-09 Menetelmä paperin tai kartongin valmistamiseksi ja menetelmän avulla valmistettu tuote
FI20022161A FI113482B (fi) 2002-10-09 2002-12-05 Menetelmä paperin tai kartongin valmistamiseksi ja menetelmän avulla valmistettu tuote
FI20022161 2002-12-05

Publications (1)

Publication Number Publication Date
WO2004033792A1 true WO2004033792A1 (fr) 2004-04-22

Family

ID=26161331

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2003/000745 WO2004033792A1 (fr) 2002-10-09 2003-10-08 Procede de production de papier ou de carton, et produit obtenu suivant ce procede

Country Status (6)

Country Link
US (1) US20060027348A1 (fr)
JP (1) JP2006502317A (fr)
AU (1) AU2003271046A1 (fr)
DE (1) DE10393449T5 (fr)
FI (1) FI113482B (fr)
WO (1) WO2004033792A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI20011455A (fi) * 2001-07-03 2003-01-04 Metso Paper Inc Menetelmä liimakäsitellyn paperin tai kartongin valmistamiseksi

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5311672A (en) * 1992-06-05 1994-05-17 J. M. Voith Gmbh Dry end of a machine for the production of a fiber web
WO2002012620A1 (fr) * 2000-08-10 2002-02-14 Metso Paper, Inc. Procede de fabrication de bande fibreuse enduite, ameliorations apportees a une machine a carton ou a papier et papier ou carton couche
WO2003004769A1 (fr) * 2001-07-03 2003-01-16 Metso Paper, Inc. Procede et dispositif servant a fabriquer du papier ou du carton encolles
WO2003018638A1 (fr) * 2001-08-28 2003-03-06 Raisio Chemicals Ltd Processus de modification d'amidon et utilisation de cet amidon

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5311672A (en) * 1992-06-05 1994-05-17 J. M. Voith Gmbh Dry end of a machine for the production of a fiber web
WO2002012620A1 (fr) * 2000-08-10 2002-02-14 Metso Paper, Inc. Procede de fabrication de bande fibreuse enduite, ameliorations apportees a une machine a carton ou a papier et papier ou carton couche
WO2003004769A1 (fr) * 2001-07-03 2003-01-16 Metso Paper, Inc. Procede et dispositif servant a fabriquer du papier ou du carton encolles
WO2003018638A1 (fr) * 2001-08-28 2003-03-06 Raisio Chemicals Ltd Processus de modification d'amidon et utilisation de cet amidon

Also Published As

Publication number Publication date
FI20022161A0 (fi) 2002-12-05
DE10393449T5 (de) 2005-09-29
FI113482B (fi) 2004-04-30
AU2003271046A1 (en) 2004-05-04
US20060027348A1 (en) 2006-02-09
JP2006502317A (ja) 2006-01-19

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