EP2486190A1 - Process for the production of a substrate comprising regenerated cellulose and a substrate produced according to the process - Google Patents

Process for the production of a substrate comprising regenerated cellulose and a substrate produced according to the process

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Publication number
EP2486190A1
EP2486190A1 EP10822324A EP10822324A EP2486190A1 EP 2486190 A1 EP2486190 A1 EP 2486190A1 EP 10822324 A EP10822324 A EP 10822324A EP 10822324 A EP10822324 A EP 10822324A EP 2486190 A1 EP2486190 A1 EP 2486190A1
Authority
EP
European Patent Office
Prior art keywords
substrate
fibres
dissolved
solution
regenerated 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.)
Granted
Application number
EP10822324A
Other languages
German (de)
French (fr)
Other versions
EP2486190A4 (en
EP2486190B1 (en
Inventor
Philip HÅKANSSON
Kaj Backfolk
Isto Heiskanen
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.)
Stora Enso Oyj
Original Assignee
Stora Enso Oyj
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Publication date
Application filed by Stora Enso Oyj filed Critical Stora Enso Oyj
Publication of EP2486190A1 publication Critical patent/EP2486190A1/en
Publication of EP2486190A4 publication Critical patent/EP2486190A4/en
Application granted granted Critical
Publication of EP2486190B1 publication Critical patent/EP2486190B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • D21H19/52—Cellulose; Derivatives 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/34—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising cellulose or derivatives thereof

Definitions

  • the present invention relates to a process for the production of a substrate comprising regenerated cellulose.
  • Cellulosic fibres are multi-component structures made from cellulose polymers, i.e. cellulose chains. Lignin, pentosans and other components known in art may also be present.
  • the cellulose chains in the fibres are
  • microfibrillated cellulose or nano-cellulose is formed. It is also possible to dissolve the cellulose by further mechanical and/or chemical treatments.
  • the cellulose will be used to dissolve the cellulose by further mechanical and/or chemical treatments.
  • the dissolved fibres can be regenerated in a regeneration solution 30 which will make cellulose polymer, particles or fibres to precipitate.
  • regenerated cellulose can for example be used as a coating on a paper or paperboard in order to form a macro-, micro- or nanostructure on the paper or paperboard which will improve the properties of the paper or paperboard required for different types of printing methods.
  • WO2007/003699 describes dissolution and regeneration of cellulosic fibres.
  • the regenerated cellulosic fibres are thereafter coated onto the surface of a paper.
  • regenerated cellulose it is difficult to handle a solution of regenerated cellulose.
  • the regenerated cellulosic polymers, particles or fibres are often not stable when in a solution.
  • the solution comprising regenerated cellulose may also have problems with rheology, which makes it difficult to apply regenerated cellulose to a surface and thus gives rise to runnability problems.
  • Another problem is that a low amount of dissolved and/or partly dissolved fibres might regenerate, i.e. the yield can be very low.
  • there might be a large amount of dissolved sugars or polysaccharides present which might cause problems later on in the process, for example problems with high BOD or COD levels.
  • Another object of the present invention is to provide a substrate with improved mechanical properties such as strength and stiffness.
  • the invention relates to a process for the production of a substrate which process comprises the steps of, providing a substrate comprising cellulosic fibres, adding a solution comprising dissolved fibres and/or partly dissolved fibres to the surface of the substrate and adding a regeneration solution to the surface of the substrate, so that the dissolved or partly dissolved fibres regenerates on the surface of the substrate, followed by drying the substrate.
  • a process for the production of a substrate comprises the steps of, providing a substrate comprising cellulosic fibres, adding a solution comprising dissolved fibres and/or partly dissolved fibres to the surface of the substrate and adding a regeneration solution to the surface of the substrate, so that the dissolved or partly dissolved fibres regenerates on the surface of the substrate, followed by drying the substrate.
  • a regeneration solution to the surface of the substrate, so that the dissolved or partly dissolved fibres regenerates on the surface of the substrate, followed by drying the substrate.
  • the solution comprising dissolved fibres and/or partly dissolved fibres may be added to the surface before addition of the regeneration solution. It is also possible to first add the regeneration solution to the surface of the substrate followed by addition of the solution comprising dissolved and/or partly dissolved fibres. In both ways the regeneration of the dissolved and/or partly dissolved fibres occurs on the surface of the substrate.
  • the concentration of dissolved and/or partly dissolved fibres in the solution comprising dissolved and/or partly dissolved fibres may be between 0.01 -50% by weight but preferably between 0.1 -5% by weight.
  • the regeneration solution may be an acid or other chemical solution.
  • the acidic solution may preferable be, citric acid, phosphoric acid, sulphuric acid, acetic acid, hydrochloric acid.
  • a solution with low pH such as polyaluminium chloride (PAC) or polyaluminum nitrate (PAN) might also be used.
  • PAC polyaluminium chloride
  • PAN polyaluminum nitrate
  • the regeneration solution may thus be an alkaline solution, preferable sodium hydroxide.
  • the surface of the substrate may also be possible to provide the surface of the substrate with more than one layer of regenerated cellulose. This is done by adding a second solution comprising dissolved and/or partly dissolved fibres and a second regeneration solution so that two layers of regenerated cellulose is formed on the surface of the substrate. It is also possible to provide the substrate with three, four or more layers of regenerated cellulose in the same manner.
  • the present invention also relates to a substrate that is produced according to the process mentioned above.
  • the substrate is preferable a printing substrate.
  • the substrate may also be a packaging material which is used in the formation of different packages. Since the regeneration of the dissolved and/or partly dissolved fibres occurs on the surface of the substrate, the regenerated cellulosic polymer, particles or fibres will be incorporated into the fibre structure on the surface of the substrate and thus bond stronger to the surface of the substrate.
  • the substrate may comprise different salts which are produced during the regeneration of cellulose and which preferable are not washed away from the substrate.
  • the invention relates to a process for production of a substrate by addition of a solution comprising dissolved and/or partly dissolved fibres and a regeneration solution which will regenerate the dissolved and/or partly dissolved fibres on the surface of the substrate.
  • the regenerated cellulose polymer, particles or fibres will form a macro, micro or nanostructure on the surface of the substrate and this will improve the printing properties of the substrate.
  • regenerated cellulosic polymer, particles or fibres on the surface of a substrate increases the bond between the fibre structure of the surface of the substrate and the regenerated cellulose. Since the formation occurs on the surface, the regenerated cellulosic polymer, particles or fibres will be incorporated into the fibre structure of the surface of the substrate and the bond will thus be stronger. Moreover, the regenerated cellulose will work as a binder whereby wet strength of the substrate is increased and dusting problems are decreased. It is also possible to modify the charge of the surface of the substrate.
  • the regenerated cellulose By, for example, regenerating the dissolved and/or partly dissolved fibres by addition of acidic chemicals, such as PAC or PAN, the regenerated cellulose will be cationic and consequently.
  • the surface of the substrate By addition of the cationic regenerated cellulose the surface of the substrate will be either cationic or amphoteric.
  • anionic inks for example inks used for inkjet printing.
  • the anionic inks will bond better and stronger to the cationic surface of the substrate.
  • the process according to the invention makes is possible to modify the charge in an easy way. Since, the regeneration of the dissolved and/or partly dissolved fibres occurs on the surface it is possible to modify the regenerated cellulose by addition of chemicals to the surface. Thus, the risk for the chemicals to react in an unwanted way before addition to the surface is avoided.
  • the process according to the invention also facilitates the addition of components such as salts to the surface of the substrate.
  • the substrate according to the invention will have a strong surface since the regeneration of the dissolved and/or partly dissolved fibres occurs on the surface and the bond between the regenerated cellulose fibres or pigments and the fibres of the surface of the substrate will be increased.
  • the mechanical strength of the entire substrate is increased since a strong layer on the top and/or bottom of a substrate will increase the strength of the entire substrate. It may thus be possible to reduce the strength of the untreated substrate and still obtain a sufficient strong substrate.
  • the substrate is preferable a paper or paperboard.
  • the substrate is preferable a printing substrate which will be printed in a subsequent printing process.
  • the substrate may also be a packaging material used for the formation of different packages.
  • the dissolved fibres can be produced by any known method. It is advantageous to use low energy consuming processes.
  • the amount of dissolved fibres in the solution comprising dissolved fibres may be between 0,01 -50% by weight but is preferred that the concentration is between 0.1 -5% by weight. Higher concentrations may increase the viscosity too much and thus make it difficult to add the solution to the surface of the substrate.
  • the solution mainly comprises dissolved fibres but it is also possible to regenerate partly dissolved fibres on the surface of the substrate.
  • the solution added to the surface of the substrate may thus comprise partly dissolved instead or as well as dissolved fibres. Partly dissolved fibres are produced by stopping the dissolution process before the fibres are completely dissolved. These partly dissolved fibres may be swollen or expanded and may also be regenerated by the addition of a regeneration solution.
  • the amount of regenerated cellulose on the surface of the substrate is preferable between 0,01 -2 g per side of the substrate. However, the amount varies depending on the desired properties of the final product.
  • the regeneration solution is a solution with a low pH or a solution with high pH. Depending on the pH during the partly or completly dissolution of the cellulose fibres, i.e. if the pH is alkaline or acid, the regeneration solution must be neutral or of the opposite pH in order for the dissolved and/or partly dissolved fibres to regenerate.
  • the regeneration solution may have a pH below 6, preferable between 2-. If an acidic regeneration solution should be used, it is preferred to use sulphuric acid, but other acids such as acetic acid, citric acid, phosphoric acid, or hydrochloric acid can also be used.
  • a solution with low pH such as polyaluminium chloride (PAC) or polyaluminum nitrate (PAN) can also be used.
  • PAC polyaluminium chloride
  • PAN polyaluminum nitrate
  • Other examples of possible chamicals are; sodium orthoborate (borax), sodium bisulfite, sodium
  • Acid salts of weak bases and strong acids such as ammonium sulfate, aluminum sulfate and the like may also be used alone or in combination with any of the substances mentioned above.
  • the regeneration solution may have a pH above 8, preferable between
  • an alkaline regeneration solution it is preferred to use sodium hydroxide, but other alkali solutions such as calcium hydroxide can also be used.
  • One side of the substrate may be treated with the solution comprising dissolved and/or partly dissolved fibres and a regeneration solution. However, it is also possible to treat both sides of the substrate.
  • the solution comprising dissolved and/or partly dissolved fibres and the regeneration solution is sprayed onto the surface of the substrate.
  • several different methods can be used for the application of the solutions, for example by the aid of rolls in combination of one or several film presses, with the aid of spray nozzles positioned in one or several lines across the substrate, with spray nozzles adapted for dosage of at least two components, with the aid of curtain coaters or with a combination of any of these methods. If a curtain coater is used, it is possible that two or more curtains origin from the same coater.
  • the application of the solution comprising dissolved and/or partly dissolved fibres and the regeneration solution can further be made by the use of a sheet or web-fed printing or converting machine.
  • An offset, flexographic or an inkjet printing press can for instance first print the solution comprising dissolved and/or partly dissolved fibres and then transfer the regeneration solution to the surface and thus create wet on wet application step before either applying a third layer without or with intermediate drying.
  • Another application could be to use an in-situ spray system to dose the solution comprising dissolved and/or partly dissolved fibres and the regeneration solution.
  • the treatment could then be followed by drying or alternatively impact or non-impact printing.
  • the solution comprising dissolved and/or partly dissolved fibres may also be possible to mix the solution comprising dissolved and/or partly dissolved fibres with the regeneration solution directly before the addition to the surface of the substrate. In this way the regeneration of the dissolved and/or partly dissolved fibres will occur directly before addition or during the addition of the solutions to the surface of the substrate.
  • regenerated cellulose This may be done by addition of more than one solution comprising dissolved and/or partly dissolved fibres and more than one regeneration solution. In this way a substrate with several layers of regenerated cellulose will be formed. When producing a printing substrate, it may be necessary to provide the substrate with a large amount of
  • the substrate is coated with a conventional coating before and/or after the coating with the regenerated cellulose. This might be done in order to further improve the printing properties of the substrate.
  • the substrate is dried in order to a dried substrate to form. All known processes for drying cellulosic substrates may be used.
  • the substrate may comprise other components which are commonly used in papermaking, such as sizing agents, fillers, OBA and other additives.
  • the substrate comprises cellulosic fibers and by this, not only cellulosic fibers but all components which origins from cellulosic fibers are included. Examples of such components are microfibrillated cellulose (nanocellulose) or regenerated cellulose.
  • the dissolved and/or partly dissolved fibres may be hardwood and/or softwood cellulosic fibres. However, other fibres may also be dissolved and/or partly dissolved and regenerated on the surface of a substrate. Examples of such fibres can be, agricultular fibres such as fibres from different grains, bagasse, starch fibres or other similar fibres.
  • the substrate may comprise hardwood and/or softwood fibres.
  • the substrate may comprise chemical and/or mechanical pulp. Since the regeneration of the dissolved and/or partly dissolved fibres occurs on the surface of the substrate, the regenerated cellulosic pigments or fibres will bond stronger to the surface of the substrate and thus be incorporated into the fibre structure on the surface of the substrate. It is preferred that the substrate is a printing substrate.
  • the printing substrate of the invention shows improved printing properties since both regenerated cellulose and sometimes also other components, such as different salts, may be present on the surface of the printing substrate. Also, the possibility to modify the charge of the regenerated cellulosic pigments or fibres makes it possible to enhance the printing substrate's ability to absorb ink in a desired way.
  • the substrate is a packaging material. It may also be possible to add chemicals which will react on increased temperature and/or decreased dry content and it will thus be possible to control to that the regeneration of cellulosic fibres or pigments occur during drying of the substrate. There are a number of different chemicals, such as different polymers and surfactants, that are sensitive to temperature changes and their properties will thus change at increased temperature and the regeneration of cellulose will then occur.

Abstract

The present invention relates to a process for the production of a substrate wherein the process comprises, providing a substrate comprising cellulosic fibers, applying a solution comprising water soluble silicate to the surface of the substrate, treating the substrate so that the water soluble silicate is polymerized forming silica pigments on the surface of the substrate and the substrate is thereafter dried. The invention further relates to a substrate produced according to the process.

Description

Process for the production of a substrate comprising regenerated cellulose and a substrate produced according to the process
Field of the invention
The present invention relates to a process for the production of a substrate comprising regenerated cellulose.
5
Background
Cellulosic fibres are multi-component structures made from cellulose polymers, i.e. cellulose chains. Lignin, pentosans and other components known in art may also be present. The cellulose chains in the fibres are
10 attached to each other to form elementary fibrils. Several elementary fibrils are bound to each other to form microfibrils and several microfibrils form aggregates. The links between the cellulose chains, elementary- and microfibrils are hydrogen bonds.
15 It is possible to mechanically and/or chemically and/or biochemically
(e.g. with enzymes) disintegrate the cellulosic fibres which will destroy the attachment between the microfibrils of the fibres. In this way microfibrillated cellulose or nano-cellulose is formed. It is also possible to dissolve the cellulose by further mechanical and/or chemical treatments. The cellulose will
20 then further disintegrate into even smaller particles and a clear solution will be formed and the cellulose has thus dissolved. There are a number of different methods which describe the dissolution of cellulosic fibres.
It is common to use different process steps which often comprise
25 enzymatic treatments and alkaline treatments in order for the cellulosic fibres to dissolve. Different processes can be seen in Fl 107335, WO 01/96402 and WO2007/003699. The dissolved fibres are often used in films.
The dissolved fibres can be regenerated in a regeneration solution 30 which will make cellulose polymer, particles or fibres to precipitate. The
regenerated cellulose can for example be used as a coating on a paper or paperboard in order to form a macro-, micro- or nanostructure on the paper or paperboard which will improve the properties of the paper or paperboard required for different types of printing methods.
WO2007/003699 describes dissolution and regeneration of cellulosic fibres. The regenerated cellulosic fibres are thereafter coated onto the surface of a paper.
However, it is difficult to handle a solution of regenerated cellulose. The regenerated cellulosic polymers, particles or fibres are often not stable when in a solution. The solution comprising regenerated cellulose may also have problems with rheology, which makes it difficult to apply regenerated cellulose to a surface and thus gives rise to runnability problems. Another problem is that a low amount of dissolved and/or partly dissolved fibres might regenerate, i.e. the yield can be very low. Furthermore, there might be a large amount of dissolved sugars or polysaccharides present, which might cause problems later on in the process, for example problems with high BOD or COD levels.
There is thus a need for an improved process to provide a surface of a substrate with regenerated cellulose.
Summary of the invention
It is an object of the present invention to provide a process for production of a substrate comprising regenerated cellulose in an improved way.
Another object of the present invention is to provide a substrate with improved mechanical properties such as strength and stiffness. These objects and other advantages are achieved by the process according to claim 1. By addition of a solution comprising dissolved fibres and/or partly dissolved fibres and a regeneration solution to the surface of a substrate it is possible to regenerate the cellulose on the surface and thus to provide a surface of a substrate with regenerated cellulose in an easy and improved way. This is achieved by the independent claims and preferred embodiments of the process are defined in the dependent claims. The invention relates to a process for the production of a substrate which process comprises the steps of, providing a substrate comprising cellulosic fibres, adding a solution comprising dissolved fibres and/or partly dissolved fibres to the surface of the substrate and adding a regeneration solution to the surface of the substrate, so that the dissolved or partly dissolved fibres regenerates on the surface of the substrate, followed by drying the substrate. In this way, it is possible to provide a surface of a substrate with regenerated cellulose in a very easy and efficient way. The regenerated cellulose may preferable be in the form of polymer, particles or fibres which during formation will be incorporated into the fibre structure of the surface of the substrate. In this way, stronger bonds between the regenerated cellulose and the fibres or other paper components, such as fillers, of the substrate are created compared to if regenerated cellulosic particles is added to the surface. Furthermore, the complicated storage and application of regenerated cellulose to a surface is avoided as well as retention of small regenerated sugar or polysaccharide molecules.
The solution comprising dissolved fibres and/or partly dissolved fibres may be added to the surface before addition of the regeneration solution. It is also possible to first add the regeneration solution to the surface of the substrate followed by addition of the solution comprising dissolved and/or partly dissolved fibres. In both ways the regeneration of the dissolved and/or partly dissolved fibres occurs on the surface of the substrate. The concentration of dissolved and/or partly dissolved fibres in the solution comprising dissolved and/or partly dissolved fibres may be between 0.01 -50% by weight but preferably between 0.1 -5% by weight.
If the cellulose is dissolved and/or partly dissolved in an alkaline solution it will be possible to regenerate the cellulose by addition of a solution with a low pH, preferable a solution with a pH below 6. The regeneration solution may be an acid or other chemical solution. The acidic solution may preferable be, citric acid, phosphoric acid, sulphuric acid, acetic acid, hydrochloric acid. A solution with low pH, such as polyaluminium chloride (PAC) or polyaluminum nitrate (PAN) might also be used.
If the cellulose is dissolved and/or partly dissolved in an acid solution it will be possible to regenerate the cellulose by addition of a solution with a higher ρΗ, preferable with a pH above 8. The regeneration solution may thus be an alkaline solution, preferable sodium hydroxide.
It may also be possible to provide the surface of the substrate with more than one layer of regenerated cellulose. This is done by adding a second solution comprising dissolved and/or partly dissolved fibres and a second regeneration solution so that two layers of regenerated cellulose is formed on the surface of the substrate. It is also possible to provide the substrate with three, four or more layers of regenerated cellulose in the same manner.
The present invention also relates to a substrate that is produced according to the process mentioned above. The substrate is preferable a printing substrate. The substrate may also be a packaging material which is used in the formation of different packages. Since the regeneration of the dissolved and/or partly dissolved fibres occurs on the surface of the substrate, the regenerated cellulosic polymer, particles or fibres will be incorporated into the fibre structure on the surface of the substrate and thus bond stronger to the surface of the substrate. Furthermore, the substrate may comprise different salts which are produced during the regeneration of cellulose and which preferable are not washed away from the substrate.
Detailed description
The invention relates to a process for production of a substrate by addition of a solution comprising dissolved and/or partly dissolved fibres and a regeneration solution which will regenerate the dissolved and/or partly dissolved fibres on the surface of the substrate. The regenerated cellulose polymer, particles or fibres will form a macro, micro or nanostructure on the surface of the substrate and this will improve the printing properties of the substrate.
It has been shown that the formation of regenerated cellulosic polymer, particles or fibres on the surface of a substrate increases the bond between the fibre structure of the surface of the substrate and the regenerated cellulose. Since the formation occurs on the surface, the regenerated cellulosic polymer, particles or fibres will be incorporated into the fibre structure of the surface of the substrate and the bond will thus be stronger. Moreover, the regenerated cellulose will work as a binder whereby wet strength of the substrate is increased and dusting problems are decreased. It is also possible to modify the charge of the surface of the substrate.
By, for example, regenerating the dissolved and/or partly dissolved fibres by addition of acidic chemicals, such as PAC or PAN, the regenerated cellulose will be cationic and consequently. By addition of the cationic regenerated cellulose the surface of the substrate will be either cationic or amphoteric. This is advantageous when the substrate is printed with anionic inks, for example inks used for inkjet printing. The anionic inks will bond better and stronger to the cationic surface of the substrate. The process according to the invention makes is possible to modify the charge in an easy way. Since, the regeneration of the dissolved and/or partly dissolved fibres occurs on the surface it is possible to modify the regenerated cellulose by addition of chemicals to the surface. Thus, the risk for the chemicals to react in an unwanted way before addition to the surface is avoided.
Moreover, during the regeneration of cellulose, other components, such as salts, are also often formed. In prior art, these components are normally washed away before addition of the regenerated cellulose to a substrate. However, it has now been shown that it is advantageous to keep these components on the surface of a substrate. The components are mainly salts of different types and they are good for destabilizing the ink particles. If the regeneration solution comprises sodium hydroxide or calcium hydroxide, sodium-salts respectively calcium-salts will be formed. Thus, the process according to the invention also facilitates the addition of components such as salts to the surface of the substrate. The substrate according to the invention will have a strong surface since the regeneration of the dissolved and/or partly dissolved fibres occurs on the surface and the bond between the regenerated cellulose fibres or pigments and the fibres of the surface of the substrate will be increased. Thus, the mechanical strength of the entire substrate is increased since a strong layer on the top and/or bottom of a substrate will increase the strength of the entire substrate. It may thus be possible to reduce the strength of the untreated substrate and still obtain a sufficient strong substrate. The substrate is preferable a paper or paperboard. The substrate is preferable a printing substrate which will be printed in a subsequent printing process. The substrate may also be a packaging material used for the formation of different packages.
The dissolved fibres can be produced by any known method. It is advantageous to use low energy consuming processes. The amount of dissolved fibres in the solution comprising dissolved fibres may be between 0,01 -50% by weight but is preferred that the concentration is between 0.1 -5% by weight. Higher concentrations may increase the viscosity too much and thus make it difficult to add the solution to the surface of the substrate.
However, too low concentrations may increase the amount of water added to the substrate.
It is preferred that the solution mainly comprises dissolved fibres but it is also possible to regenerate partly dissolved fibres on the surface of the substrate. The solution added to the surface of the substrate may thus comprise partly dissolved instead or as well as dissolved fibres. Partly dissolved fibres are produced by stopping the dissolution process before the fibres are completely dissolved. These partly dissolved fibres may be swollen or expanded and may also be regenerated by the addition of a regeneration solution. The amount of regenerated cellulose on the surface of the substrate is preferable between 0,01 -2 g per side of the substrate. However, the amount varies depending on the desired properties of the final product.
The regeneration solution is a solution with a low pH or a solution with high pH. Depending on the pH during the partly or completly dissolution of the cellulose fibres, i.e. if the pH is alkaline or acid, the regeneration solution must be neutral or of the opposite pH in order for the dissolved and/or partly dissolved fibres to regenerate. The regeneration solution may have a pH below 6, preferable between 2-. If an acidic regeneration solution should be used, it is preferred to use sulphuric acid, but other acids such as acetic acid, citric acid, phosphoric acid, or hydrochloric acid can also be used.
Furthermore, a solution with low pH, such as polyaluminium chloride (PAC) or polyaluminum nitrate (PAN) can also be used. Other examples of possible chamicals are; sodium orthoborate (borax), sodium bisulfite, sodium
bicarbonate, sodium dihydrogen phosphate, carbon dioxide or a combination of two or more of these substances. Acid salts of weak bases and strong acids such as ammonium sulfate, aluminum sulfate and the like may also be used alone or in combination with any of the substances mentioned above.
It is also possible to use water as a neutralization medium. The regeneration solution may have a pH above 8, preferable between
10-12. If an alkaline regeneration solution should be used it is preferred to use sodium hydroxide, but other alkali solutions such as calcium hydroxide can also be used. One side of the substrate may be treated with the solution comprising dissolved and/or partly dissolved fibres and a regeneration solution. However, it is also possible to treat both sides of the substrate.
It is preferred that the solution comprising dissolved and/or partly dissolved fibres and the regeneration solution is sprayed onto the surface of the substrate. However, several different methods can be used for the application of the solutions, for example by the aid of rolls in combination of one or several film presses, with the aid of spray nozzles positioned in one or several lines across the substrate, with spray nozzles adapted for dosage of at least two components, with the aid of curtain coaters or with a combination of any of these methods. If a curtain coater is used, it is possible that two or more curtains origin from the same coater. The application of the solution comprising dissolved and/or partly dissolved fibres and the regeneration solution can further be made by the use of a sheet or web-fed printing or converting machine. An offset, flexographic or an inkjet printing press can for instance first print the solution comprising dissolved and/or partly dissolved fibres and then transfer the regeneration solution to the surface and thus create wet on wet application step before either applying a third layer without or with intermediate drying.
Another application could be to use an in-situ spray system to dose the solution comprising dissolved and/or partly dissolved fibres and the regeneration solution. The treatment could then be followed by drying or alternatively impact or non-impact printing.
It is possible to first add the solution comprising dissolved and/or partly dissolved fibres to the surface of the substrate followed by addition of the regeneration solution. However, it is also possible to first add the regeneration solution to the surface of the substrate followed by the solution comprising dissolved and/or partly dissolved fibres. In both ways, regeneration of the dissolved and/or partly dissolved fibres will occur on the surface of the substrate. By separately add the two solutions the problems with storage of regenerated cellulose is avoided.
It may also be possible to mix the solution comprising dissolved and/or partly dissolved fibres with the regeneration solution directly before the addition to the surface of the substrate. In this way the regeneration of the dissolved and/or partly dissolved fibres will occur directly before addition or during the addition of the solutions to the surface of the substrate.
It is also possible to make multi-layer coatings with the process according to the invention, i.e. to make more than one layers with
regenerated cellulose. This may be done by addition of more than one solution comprising dissolved and/or partly dissolved fibres and more than one regeneration solution. In this way a substrate with several layers of regenerated cellulose will be formed. When producing a printing substrate, it may be necessary to provide the substrate with a large amount of
regenerated cellulose in order to achieve the desired printing properties. It may be difficult to add large amounts of regenerated cellulose in one step and it is therefore sometimes necessary to add more than one layer of
regenerated cellulose to the surface of the substrate.
It is also possible to coat the substrate with a conventional coating before and/or after the coating with the regenerated cellulose. This might be done in order to further improve the printing properties of the substrate. After the addition of the solution comprising dissolved and/or partly dissolved fibres and the regeneration solution, the substrate is dried in order to a dried substrate to form. All known processes for drying cellulosic substrates may be used.
The substrate may comprise other components which are commonly used in papermaking, such as sizing agents, fillers, OBA and other additives.
It is possible to add other components or additives separately or together with either the solution comprising dissolved and/or partly dissolved fibres or the regeneration solution. It may for example be preferred to add starch together with the solution comprising dissolved and/or partly dissolved fibres which might further improve the properties of the substrate.
The substrate comprises cellulosic fibers and by this, not only cellulosic fibers but all components which origins from cellulosic fibers are included. Examples of such components are microfibrillated cellulose (nanocellulose) or regenerated cellulose.
The dissolved and/or partly dissolved fibres may be hardwood and/or softwood cellulosic fibres. However, other fibres may also be dissolved and/or partly dissolved and regenerated on the surface of a substrate. Examples of such fibres can be, agricultular fibres such as fibres from different grains, bagasse, starch fibres or other similar fibres.
The substrate may comprise hardwood and/or softwood fibres. The substrate may comprise chemical and/or mechanical pulp. Since the regeneration of the dissolved and/or partly dissolved fibres occurs on the surface of the substrate, the regenerated cellulosic pigments or fibres will bond stronger to the surface of the substrate and thus be incorporated into the fibre structure on the surface of the substrate. It is preferred that the substrate is a printing substrate. The printing substrate of the invention shows improved printing properties since both regenerated cellulose and sometimes also other components, such as different salts, may be present on the surface of the printing substrate. Also, the possibility to modify the charge of the regenerated cellulosic pigments or fibres makes it possible to enhance the printing substrate's ability to absorb ink in a desired way.
It is also possible that the substrate is a packaging material. It may also be possible to add chemicals which will react on increased temperature and/or decreased dry content and it will thus be possible to control to that the regeneration of cellulosic fibres or pigments occur during drying of the substrate. There are a number of different chemicals, such as different polymers and surfactants, that are sensitive to temperature changes and their properties will thus change at increased temperature and the regeneration of cellulose will then occur.

Claims

Claims
1. A process for the production of a substrate which process
comprises the steps of:
- providing a substrate comprising cellulosic fibres,
- adding a solution comprising dissolved and/or partly dissolved fibres to the surface of the substrate,
- adding a regeneration solution to the surface of the substrate so that the dissolved and/or partly dissolved fibres regenerates on the surface of the substrate,
- drying the substrate.
2. The process according to claim 1 characterized in that the solution comprising dissolved and/or partly dissolved fibres is added to the surface before the regeneration solution.
3. The process according to claim 1 characterized in that the
regeneration solution is added to the surface before the solution comprising dissolved and/or partly dissolved fibres.
4. The process according to any of the preceding claims characterized in that the concentration of the dissolved and/or partly dissolved fibres in the solution is between 0.01 -50% by weight, preferable between 0,1-5% by weight.
5. The process according to any of the preceding claims characterized in that the regeneration solution has a pH below 6.
6. The process according to any one of claims 1 -4 characterized in that the regeneration solution has a pH above 8.
7. The process according to any of the preceding claims characterized in that the process further comprises the steps of:
- adding a second solution comprising dissolved and/or partly dissolved fibres to the surface of the substrate, - adding a second regeneration solution to the surface of the substrate so that a second layer of regenerated cellulose is formed on the surface of the substrate.
8. The process according to claim 7 characterized in that the process further comprises the steps of:
- adding a third solution comprising dissolved and/or partly dissolved fibres to the surface of the substrate,
- adding a third regeneration solution to the surface of the substrate so that a third layer of regenerated cellulose is formed on the surface of the substrate.
9. A substrate produced according to the process according to any of claims 1 -8.
10. The substrate according to claim 9 wherein the substrate is a printing substrate.
1 1. The substrate according to claim 9 wherein the substrate is a packaging material.
EP10822324.9A 2009-10-09 2010-10-05 Process for the production of a substrate comprising regenerated cellulose and a substrate produced according to the process Not-in-force EP2486190B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0950746A SE534211C2 (en) 2009-10-09 2009-10-09 Process for making a substrate containing regenerated cellulose and a substrate made according to the process
PCT/SE2010/051075 WO2011043726A1 (en) 2009-10-09 2010-10-05 Process for the production of a substrate comprising regenerated cellulose and a substrate produced according to the process

Publications (3)

Publication Number Publication Date
EP2486190A1 true EP2486190A1 (en) 2012-08-15
EP2486190A4 EP2486190A4 (en) 2014-01-08
EP2486190B1 EP2486190B1 (en) 2017-03-08

Family

ID=43857006

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10822324.9A Not-in-force EP2486190B1 (en) 2009-10-09 2010-10-05 Process for the production of a substrate comprising regenerated cellulose and a substrate produced according to the process

Country Status (5)

Country Link
EP (1) EP2486190B1 (en)
CN (1) CN102666986B (en)
BR (1) BR112012008198A2 (en)
SE (1) SE534211C2 (en)
WO (1) WO2011043726A1 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6080277A (en) * 1995-02-21 2000-06-27 Tfm Handels-Aktiengesellschaft Cellulose particles, method for producing them and their use

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Publication number Priority date Publication date Assignee Title
FI107335B (en) 1991-02-28 2001-07-13 Inst Wlokien Chem Process for producing alkali-soluble cellulose and process for producing fibres, films and other products from soluble cellulose
PL196594B1 (en) 2000-06-12 2008-01-31 Inst Biopolimerow Wlokien Chem Method of obtaining monofilaments, films and other products of modified soluble cellulose
CN1229214C (en) * 2003-12-12 2005-11-30 武汉大学 Process for preparing regenerated cellulose films and wires
FI20055381A (en) * 2005-07-01 2007-01-02 M Real Oyj Process for dissolving cellulose and producing cellulose particles
FI20055380L (en) * 2005-07-01 2007-01-02 M Real Oyj Method for coating cellulose particles, coated cellulose particles and their use in paper and cardboard manufacturing
JP4980789B2 (en) * 2006-06-05 2012-07-18 レンゴー株式会社 Total heat exchanger seat

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
US6080277A (en) * 1995-02-21 2000-06-27 Tfm Handels-Aktiengesellschaft Cellulose particles, method for producing them and their use

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2011043726A1 *

Also Published As

Publication number Publication date
SE534211C2 (en) 2011-05-31
BR112012008198A2 (en) 2016-04-19
WO2011043726A1 (en) 2011-04-14
EP2486190A4 (en) 2014-01-08
SE0950746A1 (en) 2011-04-10
CN102666986A (en) 2012-09-12
EP2486190B1 (en) 2017-03-08
CN102666986B (en) 2016-02-17

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