EP2486190B1 - 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 Download PDFInfo
- Publication number
- EP2486190B1 EP2486190B1 EP10822324.9A EP10822324A EP2486190B1 EP 2486190 B1 EP2486190 B1 EP 2486190B1 EP 10822324 A EP10822324 A EP 10822324A EP 2486190 B1 EP2486190 B1 EP 2486190B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- substrate
- dissolved
- solution
- fibres
- cellulosic fibres
- 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.)
- Not-in-force
Links
- 239000000758 substrate Substances 0.000 title claims description 115
- 238000000034 method Methods 0.000 title claims description 38
- 239000004627 regenerated cellulose Substances 0.000 title claims description 36
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 230000008929 regeneration Effects 0.000 claims description 47
- 238000011069 regeneration method Methods 0.000 claims description 47
- 238000007639 printing Methods 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 6
- 239000005022 packaging material Substances 0.000 claims description 4
- 239000000243 solution Substances 0.000 description 68
- 229920002678 cellulose Polymers 0.000 description 19
- 239000001913 cellulose Substances 0.000 description 19
- 239000002245 particle Substances 0.000 description 10
- 239000000126 substance Substances 0.000 description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 229920000642 polymer Polymers 0.000 description 9
- 239000000835 fiber Substances 0.000 description 8
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- 239000002253 acid Substances 0.000 description 6
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
- 239000000123 paper Substances 0.000 description 6
- 150000003839 salts Chemical class 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000000976 ink Substances 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- 125000002091 cationic group Chemical group 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 4
- 210000001724 microfibril Anatomy 0.000 description 4
- 239000011087 paperboard Substances 0.000 description 4
- 239000000049 pigment Substances 0.000 description 4
- 238000011282 treatment Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229920003043 Cellulose fiber Polymers 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 239000012670 alkaline solution Substances 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- 125000000129 anionic group Chemical group 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 150000004676 glycans Chemical class 0.000 description 2
- 239000011121 hardwood Substances 0.000 description 2
- 238000007641 inkjet printing Methods 0.000 description 2
- 239000002086 nanomaterial Substances 0.000 description 2
- 229920001282 polysaccharide Polymers 0.000 description 2
- 239000005017 polysaccharide Substances 0.000 description 2
- 239000011122 softwood Substances 0.000 description 2
- 239000008107 starch Substances 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 235000000346 sugar Nutrition 0.000 description 2
- 239000001117 sulphuric acid Substances 0.000 description 2
- 235000011149 sulphuric acid Nutrition 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241000609240 Ambelania acida Species 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- 229920001046 Nanocellulose Polymers 0.000 description 1
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 239000010905 bagasse Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000368 destabilizing effect Effects 0.000 description 1
- 238000010410 dusting Methods 0.000 description 1
- 230000002255 enzymatic effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229910000403 monosodium phosphate Inorganic materials 0.000 description 1
- 235000019799 monosodium phosphate Nutrition 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 description 1
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 150000008163 sugars Chemical class 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- BSVBQGMMJUBVOD-UHFFFAOYSA-N trisodium borate Chemical compound [Na+].[Na+].[Na+].[O-]B([O-])[O-] BSVBQGMMJUBVOD-UHFFFAOYSA-N 0.000 description 1
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 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.
- the dissolved fibres can be regenerated in a regeneration solution 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.
- 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 cellulosic fibres and/or partly dissolved cellulosic 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 cellulosic fibres regenerates on the surface of the substrate, followed by drying the substrate.
- 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.
- the solution comprising dissolved cellulosic fibres and/or partly dissolved cellulosic 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 cellulosic fibres. In both ways the regeneration of the dissolved and/or partly dissolved cellulosic fibres occurs on the surface of the substrate.
- the concentration of dissolved and/or partly dissolved cellulosic fibres in the solution comprising dissolved and/or partly dissolved cellulosic 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 cellulosic 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 cellulosic 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 cellulosic fibres and a regeneration solution which will regenerate the dissolved and/or partly dissolved cellulosic 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.
- the regenerated cellulose will work as a binder whereby wet strength of the substrate is increased and dusting problems are decreased.
- the regenerated cellulose will be cationic and consequently.
- 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 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 cellulosic 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 cellulosic fibres can be produced by any known method. It is advantageous to use low energy consuming processes.
- the amount of dissolved cellulosic fibres in the solution comprising dissolved cellulosic 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.
- the solution mainly comprises dissolved cellulosic fibres but it is also possible to regenerate partly dissolved cellulosic 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 cellulosic fibres.
- Partly dissolved cellulosic fibres are produced by stopping the dissolution process before the fibres are completely dissolved.
- These partly dissolved cellulosic 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 cellulosic 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 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.
- 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 cellulosic 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 cellulosic 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 cellulosic 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 cellulosic 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 cellulosic 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 cellulosic fibres may also be possible to mix the solution comprising dissolved and/or partly dissolved cellulosic 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 cellulosic fibres will occur directly before addition or during the addition of the solutions to the surface of the substrate.
- 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 cellulosic fibres and more than one regeneration solution.
- a substrate with several layers of regenerated cellulose will be formed.
- 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.
- 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.
- the substrate After the addition of the solution comprising dissolved and/or partly dissolved cellulosic 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.
- 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 cellulosic fibres may be hardwood and/or softwood cellulosic fibres. However, other cellulosic 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 cellulosic 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.
Landscapes
- Paper (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Description
- 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 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.
- 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 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 enzymatic treatments and alkaline treatments in order for the cellulosic fibres to dissolve. Different processes can be seen in
FI 107335 WO 01/96402 WO2007/003699 . The dissolved fibres are often used in films. - The dissolved fibres can be regenerated in a regeneration solution 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.
- 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 cellulosic fibres and/or partly dissolved cellulosic 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 cellulosic fibres and/or partly dissolved cellulosic 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 cellulosic 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 cellulosic fibres and/or partly dissolved cellulosic 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 cellulosic fibres. In both ways the regeneration of the dissolved and/or partly dissolved cellulosic fibres occurs on the surface of the substrate.
- The concentration of dissolved and/or partly dissolved cellulosic fibres in the solution comprising dissolved and/or partly dissolved cellulosic 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 pH, 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 cellulosic 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 cellulosic 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.
- The invention relates to a process for production of a substrate by addition of a solution comprising dissolved and/or partly dissolved cellulosic fibres and a regeneration solution which will regenerate the dissolved and/or partly dissolved cellulosic 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 cellulosic 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 cellulosic 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 cellulosic 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 cellulosic fibres can be produced by any known method. It is advantageous to use low energy consuming processes. The amount of dissolved cellulosic fibres in the solution comprising dissolved cellulosic 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 cellulosic fibres but it is also possible to regenerate partly dissolved cellulosic 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 cellulosic fibres. Partly dissolved cellulosic fibres are produced by stopping the dissolution process before the fibres are completely dissolved. These partly dissolved cellulosic 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 cellulosic 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 cellulosic 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 cellulosic 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 cellulosic 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 cellulosic 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 cellulosic 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 cellulosic 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 cellulosic fibres. In both ways, regeneration of the dissolved and/or partly dissolved cellulosic 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 cellulosic 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 cellulosic 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 cellulosic 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 cellulosic 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 cellulosic fibres or the regeneration solution. It may for example be preferred to add starch together with the solution comprising dissolved and/or partly dissolved cellulosic 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 cellulosic fibres may be hardwood and/or softwood cellulosic fibres. However, other cellulosic 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 cellulosic 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 (11)
- 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 cellulosic 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 cellulosic fibres regenerates on the surface of the substrate,- drying the substrate.
- The process according to claim 1 characterized in that the solution comprising dissolved and/or partly dissolved cellulosic fibres is added to the surface before the regeneration solution.
- 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 cellulosic fibres.
- The process according to any of the preceding claims characterized in that the concentration of the dissolved and/or partly dissolved cellulosic fibres in the solution is between 0.01-50% by weight, preferable between 0,1-5% by weight.
- The process according to any of the preceding claims characterized in that the regeneration solution has a pH below 6.
- The process according to any one of claims 1-4 characterized in that the regeneration solution has a pH above 8.
- 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 cellulosic 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.
- 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 cellulosic 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.
- A substrate produced according to the process according to any of claims 1-8.
- The substrate according to claim 9 wherein the substrate is a printing substrate.
- The substrate according to claim 9 wherein the substrate is a packaging material.
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 EP2486190A1 (en) | 2012-08-15 |
EP2486190A4 EP2486190A4 (en) | 2014-01-08 |
EP2486190B1 true 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) |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
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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 |
CN1106402C (en) * | 1995-02-21 | 2003-04-23 | 塞尔卡特股份有限公司 | Cellulose particles, method for producing them and their use |
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 |
-
2009
- 2009-10-09 SE SE0950746A patent/SE534211C2/en not_active IP Right Cessation
-
2010
- 2010-10-05 WO PCT/SE2010/051075 patent/WO2011043726A1/en active Application Filing
- 2010-10-05 CN CN201080056020.0A patent/CN102666986B/en not_active Expired - Fee Related
- 2010-10-05 BR BR112012008198A patent/BR112012008198A2/en not_active IP Right Cessation
- 2010-10-05 EP EP10822324.9A patent/EP2486190B1/en not_active Not-in-force
Non-Patent Citations (1)
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None * |
Also Published As
Publication number | Publication date |
---|---|
EP2486190A4 (en) | 2014-01-08 |
WO2011043726A1 (en) | 2011-04-14 |
CN102666986B (en) | 2016-02-17 |
SE534211C2 (en) | 2011-05-31 |
BR112012008198A2 (en) | 2016-04-19 |
CN102666986A (en) | 2012-09-12 |
EP2486190A1 (en) | 2012-08-15 |
SE0950746A1 (en) | 2011-04-10 |
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