EP2519689B1 - A method for making a fibre-containing product - Google Patents

A method for making a fibre-containing product Download PDF

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Publication number
EP2519689B1
EP2519689B1 EP10840634.9A EP10840634A EP2519689B1 EP 2519689 B1 EP2519689 B1 EP 2519689B1 EP 10840634 A EP10840634 A EP 10840634A EP 2519689 B1 EP2519689 B1 EP 2519689B1
Authority
EP
European Patent Office
Prior art keywords
web
wire
long
wires
nanofibrillated cellulose
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.)
Active
Application number
EP10840634.9A
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German (de)
English (en)
French (fr)
Other versions
EP2519689A4 (en
EP2519689A1 (en
Inventor
Isko Kajanto
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.)
UPM Kymmene Oy
Original Assignee
UPM Kymmene Oy
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 UPM Kymmene Oy filed Critical UPM Kymmene Oy
Publication of EP2519689A1 publication Critical patent/EP2519689A1/en
Publication of EP2519689A4 publication Critical patent/EP2519689A4/en
Application granted granted Critical
Publication of EP2519689B1 publication Critical patent/EP2519689B1/en
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Anticipated expiration legal-status Critical

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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
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/02—Complete machines for making continuous webs of paper of the Fourdrinier type
    • 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
    • D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F2/00—Transferring continuous webs from wet ends to press sections

Definitions

  • the invention relates to a method for making a fibre-containing product.
  • Fibre-containing sheets with a relatively large content of nanofibrillated cellulose has been found to have properties of particular interest.
  • the relative proportion of the surface of a piece with respect to the volume of the piece increases when the piece becomes smaller, for which reason the properties of nanoparticles often differ to a great extent from the properties of macroscopic pieces.
  • Properties which can be achieved with nanofibrillated cellulose and are of interest to the industry include, for example, particularly high tensile strength, very low porosity and partial translucency. Among other things, these properties make nanofibrillated cellulose a sought-after raw material, and products containing it would have a variety of industrial uses.
  • Nanofibrillated cellulose is a gel-like material even at low consistencies, and the removal of water from fibre materials with a high content of nanofibrillated cellulose is often slow. Furthermore, nanofibrillated cellulose sticks easily to the wire used, because small particles of nanofibrillated cellulose adhere particularly strongly to the wire cloth, which may cause problems in the manufacturing process of the fibrous product containing nanofibrillated cellulose; due to the strong adherence of the particles, the detachment of the web from the wire requires a relatively great force.
  • the web is normally detached from the wire at a very early stage when the web still has a low dry matter content, for which reason the addition of nanofibrillated cellulose into the pulp suspension in web forming machines may lead to particularly low running speeds of the web forming machines, which, in turn, may reduce substantially the cost efficiency of the grade to be run. Furthermore, this problem may be pronounced because dewatering of the web that contains nanofibrillated cellulose may be slower than normal.
  • an additional problem in the use of nanofibrillated cellulose may be the fact that the present wires commonly used in production are normally relatively coarse for small particles, wherein the degree of retention of Nanofibrillated cellulose may remain at a particularly low level when such wires are used.
  • the fibrous web tends to shrink when it dries. Because the web-like product is typically kept tight in the longitudinal direction of the web, problems in the drying shrinkage normally appear in the cross direction of the web. These problems may occur both in the manufacture of conventional fibrous products and in the manufacture of fibrous products that contain substantially nanofibrillated cellulose. Because the drying shrinkage takes place when the web dries, it might be possible to overcome the problem by operating in such a way that the web would be longer than normally in contact with the wire cloth, on which the web is formed.
  • the aim of the present invention is to find a solution to the above-mentioned problem caused by the low dry matter content in such a way that the fibrous product is kept for a sufficiently long time in contact with the wire cloth, on which the web is formed.
  • the aim is to alleviate the problem of detaching the fibrous web that contains nanofibrillated cellulose, from the wire in the manufacture of a web-like fibrous product by drying the web to a sufficient extent before the web is detached from said wire.
  • the aim is to reduce and/or to control the drying shrinkage of the web in the cross direction.
  • the detachment of the web from the wire can be performed at such a stage where the dry matter content of the web reaches a predetermined limit value. In an advantageous embodiment, this is achieved when the internal strength of the web is greater than the forces effective between the web and the wire. In this way, the web can remain intact when detached from the wire. According to an advantageous embodiment, considerable amounts of nanofibrillated cellulose can be included in the product in such a way that the web can still be detached from the wire without breaking the web. According to another advantageous embodiment, the web can be detached from the web forming wire when the dry matter content of the web is such that the drying shrinkage of the web in the cross direction has been reduced to a desired extent.
  • the web is supported on at least one wire from the formation of the web to at least the press section, for example past at least the first press nip of the press, preferably to the drying section of the web forming machine.
  • the web is supported by the same at least one wire substantially continuously all the way from the web formation to at least said stage.
  • the web to be made is supported by at least one and the same wire substantially to at least half-way of the press section.
  • the web is supported by the same wire from the formation of the web at least past the first drying group in the drying section, preferably substantially to half-way of the drying section.
  • the web is supported by the same wire past the whole drying section, for example to the point where the web is close to the first calender, the coating unit or the machine roll of the web forming machine.
  • the web is supported by only one long wire, that is, on only one side of the web.
  • the mesh size of said long wire is advantageously selected in such a way that it is possible to improve the retention of the fibre material that contains nanofibrillated cellulose.
  • the web is supported by wires that are denser than the wires commonly used in papermaking, so-called fine mesh wires. In one embodiment example, these fine mesh wires are provided on both sides of the web.
  • the long wire in contact with the web is supported by separate wires which may be coarser than the long wire.
  • the long wire is preferably placed between the pulp and the normal wire.
  • normal wires can be placed along the whole path travelled by the long wire, or they can be placed, for example, in the drying section only.
  • the web is supported by long wires on both sides at least all the way to the drying section, and normal wires are either not applied at all or they are applied in the drying section only.
  • the method for making a fibre product according to the present invention is primarily characterized in what will be presented in claim 1.
  • a web forming machine refers to a machine for making a web that contains fibrous material.
  • a machine may be, for example, a paper machine, a paperboard machine, or another corresponding machine.
  • a web refers to a planar product running in the form of a continuous web whose basic structure is a mesh formed at least partly of fibres or parts of fibres. At least some of the fibres contain cellulose. In addition, the web may contain various quantities of other substances, such as various fillers, surfactants and additives. Furthermore, water is normally used in the manufacturing process.
  • the final product of the manufacturing process may be, for example, paper, paperboard, thin wood-plastic composite, or a corresponding product.
  • a fine mesh wire refers, in the present application, to a dense wire with a mesh number of at least 130, 140 or 150.
  • the fine mesh wire may also be denser, such as, for example, a wire with a mesh number of at least 180, at least 200 or at least 220.
  • a normal wire refers, in the present application, to a wet wire or a drying wire of prior art, normally used in a web forming machine.
  • the mesh number indicates the number of filaments in a filter, such as in a wire, per one inch.
  • a long wire refers, in the present application, to a wire that extends substantially from the web forming section (wire section) to at least the press section, preferably to the first press nip in the press section.
  • Normal wires 9 refer to commonly used wires, including both wet wires and dry wires. Normal wires 9 can also be called second wires 9 in the present application.
  • Nanofibrillated cellulose refers to such fibrous material in which single microfibrils have been separated from each other.
  • Nanofibrillated cellulose particles typically have a length not greater than 1 ⁇ m, and their diameter is smaller than 1 ⁇ m, typically from about 2 nm to 200 nm.
  • the dimensions of nanofibrillated cellulose particles are dependent on the method of production of the nanofibrillated cellulose. Contrary to conventional grinding of cellulose, in the production of nanofibrillated cellulose the aim is to crush the cellulose fibres. In its appearance, nanofibrillated cellulose is typically transparent, gel-like material.
  • Figure 1 shows an advantageous embodiment of the invention.
  • Figure 2 shows an advantageous detail of the wire solution according to the embodiment of Fig. 1.
  • Figures 1 and 2 show a web forming machine 1, a headbox 2, a web forming section (wire section) 3, a press section 4, a drying section 5, a calender 6, a reel-up 7, a long wire 8, normal wires 9, and a web 10.
  • one or more normal wires 9 may be provided, but it is also possible that the solution according to the invention does not have any normal wires 9.
  • the normal wires 9 can be left out particularly from those sections of the machine, in which there is at least one long wire 8.
  • the long wire 8 is preferably a fine mesh wire.
  • normal wires 9 can be used in the web forming machine substantially in the same positions as the long wires 8, in such a way that the normal wire is placed at least partly between the long wire 8 and the rolls of the web forming machine. In this way, the normal wire 9 may prevent the wear of the long wire 8 or long wires 8. This may be advantageous because the long wire 8 may be a relatively expensive wire, in which case it is often less expensive to replace the normal wires 9 than the long wires 8.
  • the web 10 is typically supplied from the headbox 2 to the web forming section 3.
  • the number of long wires 8 is exactly one or exactly two, depending on the type of the web forming machine 1.
  • the long wire 8 can be supported by a normal wire 9(a) in the web forming section 3. In this case, the normal wire 9(a) can delay the wear of the long wire 8.
  • the web 10 is carried, supported by at least one long wire 8, forward in the drying process typically to the press section 4, where the long wire 8 can be supported by normal wires 9b, 9c of the press section, in which case said normal wires 9b, 9c can delay the wear of the long wire 8.
  • the normal wires 9b, 9c can also be eliminated from the solution according to the invention, if they have been replaced by the long wire 8.
  • the long wire 8 is placed to support the web 10 from the web forming section 3 past the first press nip of the press section 4, after which the long wire is led to the web forming section again.
  • the long wire 8 is placed to support the web past the second press nip and/or the third press nip in the press section 4, after which the web is detached from the long wire 8, which long wire 8 is then led to the web forming section 3.
  • the web 10 is advantageously led further to the drying section 5.
  • the web 10 is led, supported by at least one and the same long wire 8, from the web forming section 3 to the drying section 5.
  • the long wire is placed in such a way that the web 10 is in contact with the same long wire 8 from the web forming section 3 all the way to the desired drying group in the drying section 5, such as the first drying group, the second drying group, the third drying group, the fourth drying group, or the fifth drying group.
  • the web 10 is then detached from the long wire 8, after which the web is led forward in the process, wherein it can be, for example, in contact with normal wires 9, as in conventional papermaking.
  • the drying section 5 may be provided with one or more normal wires 9d-9g in addition to the long wire 8. At least some of the normal wires 9 may be provided substantially in the same location as the long wire 8 in the drying section 5 of the web forming machine 1, being placed between the long wire 8 and one or more rolls of the web forming machine 1, wherein said normal wires 9 may delay the wear of the long wire 8.
  • One long wire 8 may be provided, in which case the long wire 8 may be placed on one side of the web 10, or, for example, two long wires 8 may be provided in such a way that the first long wire 8 is placed on one side of the web 10 and the other long wire is placed on the other side of the web.
  • normal wires 9 may be placed, for example, in connection with one long wire 8, if desired, or in connection with both long wires 8. In some cases, the placement of normal wires 9 in connection with both long wires 8 may be preferable, for example to prevent the wear of the long wire 8.
  • the detachment of the web from the long wires 8 may take place either substantially at the same time or substantially at different times, that is, one by one in such a way that the web 10 is first detached from one long wire 8 and then from the other long wire 8.
  • the long wire 8 is placed in the web forming machine 1 advantageously in such a way that the web 10 is in continuous contact with the long wire 8 at least from the web 10 forming section 3 to the press section 4 of the web 10, for example to half-way of the press section, or all the way to the drying section 5. If the machine 1 is provided with normal wires 9 in contact with the long wire 8, the long wire 8 is placed preferably in such a way that it is between at least one normal wire 9 and the web 10 on at least one side of the web 10. The long wire 8 and the web 10 are preferably kept in contact with each other until the web 10 is sufficiently dry to be detached from the long wire 8.
  • the desired dry matter content of the web can be determined, for example, in such a way that the web is intact when detaching from the wire, and/or in such a way that the drying shrinkage in the cross direction of the web can be prevented. After this, the web 10 can be supported by normal wires 9, if necessary.
  • the number and locations of possible normal wires 9 may vary even to a great extent from some advantageous embodiments of the invention described above.
  • An essential aspect is that the long wire 8 is placed in the web forming machine 1 in such a way that said long wire supports the web 10 in a continuous manner from at least the web forming section 3 to the press section 4, more preferably to the drying section, or, for example, all the way to a possible first calender or machine roll.
  • inserting the long wire 8 through the calender 6 is not necessary for the desired final result, and in view of the desired final result it may be preferable not to convey the long wire 8 through the calender 6.
  • the long wire 8 is provided with cleaning members for cleaning the long wire 8 or part of it during its each lap.
  • cleaning members for cleaning the long wire 8.
  • this cleaning of each point of the long wire 8 always takes place after the web 10 has been detached from the long wire 8 but before said point of the long wire 8 is at that point of the web forming machine again where the web 10 is supplied to the web forming section (wire section) of the web forming machine.
  • the web forming section 3 and/or the press section 4 with some separate means or devices for accelerating the drying.
  • These may be means or devices of prior art, such as, for example, suction boxes and/or suction rolls. Particularly in the case of two wires on top of each other, there may be a need to provide more such devices than normally, and/or these devices may be more efficient than normally.
  • the web 10 can be detached from the long wire 8 at the stage where the dry matter content of the web 10 is sufficient.
  • the dry matter content may be sufficient, for example, when it is at least 8 wt-%, 9 wt-%, 10 wt-%, 11 wt-%, 12 wt-%, 13 wt-%, or 14 wt-%, but e.g. due to the structure of the wire, it may also be advantageously at least 15 wt-%, 18 wt-%, 20 wt-%, 25 wt-%, 30 wt-%, 40 wt-%, or at least 60 wt-%.
  • the suitable dry matter content is influenced, among other things, by the apparatus for drying the web and particularly by the properties of the wire in contact with the web.
  • the content of Nanofibrillated cellulose in the pulp suspension can be set high, wherein it is possible to achieve, for example, the desired properties in the final product.
  • the long wire solution according to the invention it is also possible to include relatively large quantities of nanofibrillated cellulose in the pulp, for example in such a way that at least 10 wt-%, at least 20 wt-%, at least 30 wt-%, at least 40 wt-%, at least 50 wt-%, at least 60 wt-%, or at least 70 wt-% of the dry matter of the web 10 consists of nanofibrillated cellulose.
  • the solution of the invention may be more useful when the content of nanofibrillated cellulose in the web increases, because in this case the detachment of the web from the wire may become more difficult than before.
  • the solution according to the invention it may be possible to prevent partly or even totally a situation in which the machine technical properties would become a hindrance to increasing the quantity of nanofibrillated cellulose.
  • supporting the web to the wire by significant forces may prevent the drying shrinkage of the web in the cross direction, when the supporting is continued for a sufficiently long time or even substantially along the whole drying path of the web.
  • the invention may also be useful in the manufacture of a so-called normal fibrous web, among other things for controlling the drying shrinkage in the cross direction.
  • an additional advantage can be achieved in that the addition of nanofibrillated cellulose has often been found to have an effect that increases the drying shrinkage, particularly in the cross direction of the web.
  • the drying shrinkage of a web of said kind in the cross direction may thus even exceed 10%.
  • Most of the drying shrinkage often takes place at the end of drying, in which case keeping the web on the long wire 8 may prevent the drying shrinkage substantially, particularly when it takes place from the web forming section substantially to the end of the drying section.
  • the invention is particularly important for pulps that contain nanofibrillated cellulose
  • the invention can also be applied in connection with such fibrous pulps which do not contain nanofibrillated cellulose. In this way it may be possible to substantially reduce web breaks, for example in the press section. Furthermore, the control of the shrinkage of the web in the cross section may be facilitated.
  • the invention is suitable for application in various web forming machines, and the above-presented examples are not intended to restrict the invention. Thus, the invention is not limited solely to the examples presented in Figs. 1 and 2 and in the above description, but the invention is characterized in what will be presented in the following claims.

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EP10840634.9A 2009-12-31 2010-12-17 A method for making a fibre-containing product Active EP2519689B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20096417A FI122145B (fi) 2009-12-31 2009-12-31 Menetelmä ja järjestelmä kuitupitoisen tuotteen valmistamiseksi
PCT/FI2010/051052 WO2011080386A1 (en) 2009-12-31 2010-12-17 A method and a system for making a fibre -containing product

Publications (3)

Publication Number Publication Date
EP2519689A1 EP2519689A1 (en) 2012-11-07
EP2519689A4 EP2519689A4 (en) 2013-08-07
EP2519689B1 true EP2519689B1 (en) 2015-02-25

Family

ID=41462873

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10840634.9A Active EP2519689B1 (en) 2009-12-31 2010-12-17 A method for making a fibre-containing product

Country Status (8)

Country Link
US (1) US20120291974A1 (fi)
EP (1) EP2519689B1 (fi)
JP (1) JP2013516553A (fi)
CN (1) CN102791924A (fi)
CA (1) CA2781757C (fi)
DK (1) DK2519689T3 (fi)
FI (1) FI122145B (fi)
WO (1) WO2011080386A1 (fi)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE537517C2 (sv) * 2012-12-14 2015-05-26 Stora Enso Oyj Våtlagt arkmaterial innefattande mikrofibrillerad cellulosasamt förfarande för tillverkning därav
SE539535C2 (sv) * 2013-11-07 2017-10-10 Stora Enso Oyj Förfarande för avvattning av en suspension innefattande mikrofibrillerad cellulosa
WO2016072231A1 (ja) * 2014-11-06 2016-05-12 富士フイルム株式会社 耐水性セルロースシートおよび耐水性セルロースシートの製造方法
US9816230B2 (en) * 2014-12-31 2017-11-14 Innovatech Engineering, LLC Formation of hydrated nanocellulose sheets with or without a binder for the use as a dermatological treatment
US9970159B2 (en) 2014-12-31 2018-05-15 Innovatech Engineering, LLC Manufacture of hydrated nanocellulose sheets for use as a dermatological treatment
US10865280B2 (en) * 2015-12-31 2020-12-15 Teknologian Tutkimuskeskus Vtt Oy Method of producing films from high consistency enzyme fibrillated nanocellulose
SE539833C2 (en) * 2016-04-01 2017-12-12 Stora Enso Oyj Process for production of film comprising microfibrillated cellulose
SE541755C2 (en) 2017-03-01 2019-12-10 Stora Enso Oyj Process for production of film comprising microfibrillated cellulose
CN110241647A (zh) * 2019-06-21 2019-09-17 江西农业大学 一种高强度透明纳米纤维素纸的制备方法

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JP4009423B2 (ja) * 2000-12-19 2007-11-14 凸版印刷株式会社 改質微細フィブリル化セルロースおよびその製造方法、ならびに改質微細フィブリル化セルロースを添加した紙シート、および改質微細フィブリル化セルロースを用いた塗工紙
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Also Published As

Publication number Publication date
WO2011080386A1 (en) 2011-07-07
CA2781757A1 (en) 2011-07-07
FI20096417A0 (fi) 2009-12-31
DK2519689T3 (en) 2015-06-01
FI122145B (fi) 2011-09-15
EP2519689A4 (en) 2013-08-07
JP2013516553A (ja) 2013-05-13
CA2781757C (en) 2018-03-13
EP2519689A1 (en) 2012-11-07
FI20096417A (fi) 2011-07-01
CN102791924A (zh) 2012-11-21
US20120291974A1 (en) 2012-11-22

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