EP2061931B1 - Verfahren zur beschichtung einer papieroberfläche und so hergestelltes produkt - Google Patents

Verfahren zur beschichtung einer papieroberfläche und so hergestelltes produkt Download PDF

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Publication number
EP2061931B1
EP2061931B1 EP07823075.2A EP07823075A EP2061931B1 EP 2061931 B1 EP2061931 B1 EP 2061931B1 EP 07823075 A EP07823075 A EP 07823075A EP 2061931 B1 EP2061931 B1 EP 2061931B1
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EP
European Patent Office
Prior art keywords
coating
product
coating agent
electrically assisted
solvent
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English (en)
French (fr)
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EP2061931A1 (de
Inventor
Isto Heiskanen
Kaj Backfolk
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Stora Enso Oyj
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Stora Enso Oyj
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Priority to PL07823075T priority Critical patent/PL2061931T3/pl
Publication of EP2061931A1 publication Critical patent/EP2061931A1/de
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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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/50—Spraying or projecting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/14—Plant for applying liquids or other fluent materials to objects specially adapted for coating continuously moving elongated bodies, e.g. wires, strips, pipes
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
    • G03G7/006—Substrates for image-receiving members; Image-receiving members comprising only one layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/045—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field on non-conductive substrates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2203/00—Other substrates
    • B05D2203/22—Paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/14—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by electrical means
    • 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
    • D21H19/66—Coatings characterised by a special visual effect, e.g. patterned, textured
    • D21H19/68—Coatings characterised by a special visual effect, e.g. patterned, textured uneven, broken, discontinuous

Definitions

  • the invention is part of the field of electrically assisted coating of paper and cardboard products. More exactly, the invention relates to a method for transferring very small amounts of coating onto the surface of a product and to a product thus obtained.
  • the thickness of the coating layer can be adjusted from a thin layer of a few micrometers to thicker layers.
  • a large amount of solvent penetrates into the fibre layer so that the component primarily intended for coating a surface is partly forced inside the fibre layer.
  • the fibre layer is also penetrated by a solvent, which can also affect other fibres than those on the surface. It is more difficult to evaporate the solvent deeper from the fibre layer, which consumes energy and stresses the fibres.
  • the solvent penetrating the surroundings and the interior of the fibre layer can also generate non-desirable phenomena such as reversible or irreversible swelling of the fibres, dissolution of the fibres, etc.
  • Electrically assisted coating as such is known in the coating of processed paper products. Both dry and wet methods are used for transferring and adhering the coating to a desired surface. Because the product itself is typically non-conductive, in addition to the desired final properties of the coating agents and additives used, demands are also directed to their electrical properties. Thus, the complexity of coating components known this far and the need to use polar organic solvents can be mentioned as drawbacks in the electrically assisted transfer.
  • Spray nozzles producing the small drop size are susceptible to blocking. In addition, it is problematic to achieve a small drop size with chemicals of high viscosity. Patents have been published relating to the control of spray mist ( FI 111912B / DE10330801 ).
  • Publication WO03/064766 discloses an electrostatically assisted spray coating wherein 9 g/m 2 of coating colour was applied to 52 g/m 2 LWC quality paper. In said method, the dry matter content in the coating colour was 55%. Consequently, the amount of carrier was several grams per m 2 , which amount inevitably is not sustained in the surface, but penetrates through fibre layers. When applying such a method, the smoothness and gloss tend to increase along with increased pigment amounts.
  • Patent GB-A-1328238 discloses a method for applying an adhesive to paper strip.
  • a liquid adhesive which glues dry grains of wettable adhesive, e.g. starch to the liquid adhesive layer.
  • Electrostatic means are employed to solve the problem of uneven distribution of the powder adhesive. If considered layerwise, said structure consists of base paper, liquid adhesive and powder adhesive. Liquid adhesive is applied to the base paper without electrostatic means, but the dry adhesive layer is applied utilizing electrical charge to the liquid adhesive layer.
  • Prior art document GB-A-1219802 discloses applying starch-water suspension to web at moisture content of at least 25% but less than 80%, because above this moisture content, starch particles drain through the web to be lost with the white water. In examples, it was demonstrated that by increasing the amount of starch applied by threefold from 1 to 3 % more uniform distribution through the body of the paper was achieved.
  • Publication GB-A-1285551 relates to the field of thermo-moulding. It discloses a method of powder coating a sheet of paper clipped to an earthed metal backing plate. To complete the process, it is essential to cure the resin either by heating or pressing in such a way that the resin penetrates the sheet. Said document is silent of the coating weight.
  • a paper or cardboard product, the coating of which has been performed by using electrically assisted transfer, is characterised in that the main part of the coating agent and/or its solvent or carrier will be retained on the surface, penetrating into the fibre layer at most to the depth of 30 ⁇ m in relation to the application surface of the coating. This means that the main part of the coating will stay on the surface of the object to be coated, or that it will stop to the surface of the object and the coating.
  • the coating will be adsorbed and/or absorbed to the interface between the fibre layer and the coating, or to the essentially first fibre layer in relation to the nozzle.
  • the method of the invention for the electrically assisted coating of a paper or cardboard product is characterised in that the main part of the coating agent will be retained on the base layer at the depth of at most one fibre layer, essentially at the depth of at most 30 ⁇ m, more preferably at the depth of at most 20 ⁇ m, even more preferably at the depth of at most 10 ⁇ m, and most preferably at the depth of at most 5 ⁇ m in relation to the application surface of the coating.
  • the swelling liquid is typically a solvent or carrier of the coating agent, usually water.
  • swelling refers here to the swelling of all components in the paper, for example, filling agents, pigments, binding agents, etc., but especially to the swelling of fibres, as in Figure 8b .
  • the small drop size is especially significant in electrically assisted coating.
  • a phenomenon related to it is, among others, the considerable increase in surface area obtained in connection with small particles to be sprayed, which again makes possible the evaporation during the flight, which has been noticed to be of advantage.
  • at least one dimension of the flying drop or fibre is advantageously on the nano scale; in other words, the thickness of the drop or the diameter of the fibre when it adheres to the surface to be coated. Achieving a smaller drop size can further be improved by using surface-active agents and/or agents affecting the charging density or similar, intended especially for this purpose.
  • the temperature of the liquid can be raised, when needed, so that a smaller drop size can often be achieved.
  • diluting the chemical used it is possible to get a smaller drop size and, due to the small drop size, it is possible to make use of the evaporation of the diluting agent from the drop during the air current so that the amount of liquid getting to the web will, nevertheless, remain relatively low.
  • the coating agent found in the product refers here to a coating, which has adhered to the product after having been processed according to the invention and, optionally, after further processing stages typical of the field.
  • the number emphasises the lack of migration typical of the method from the spreading surface to the fibre spaces and to the interior. Thus, the percentage does not include the loss during the process, or the coating agent got into the side or discharge currents.
  • an e-spray or e-spin method is used as the electrically assisted transfer.
  • E-spraying i.e. electrostatic spraying, i.e. electric spray deviates from, e.g. spray painting in that the drop is formed by an electric field and not by the kinetic or viscose forces of the material.
  • electrostatic spraying i.e. electric spray deviates from, e.g. spray painting in that the drop is formed by an electric field and not by the kinetic or viscose forces of the material.
  • the extremely fine nano-aerosol formed in the electric field offers advantages in the coating.
  • E-spin i.e. electrostatic defibration deviates from e-spray in that in this method an electric field is used for forming fine, continuous fibres.
  • the diameter of single fibres is typically less than 5 ⁇ m, but especially in the range of less than 400nm.
  • at least part of the material forms fibres, but there may also occur drops and/or a combination of these, chained drops.
  • the coating agent forms a reticular layer to the surface of the product, the layer being in contact with the fibres essentially principally from the fibre tops. It can be seen from the SEM view in Figure 7 how the coating agent has been spun onto the core surface as fibres and drops. The fibres of the coating agent set to the tops of the topography of the surface to be coated, where they will adhere to the base layer. On the other hand, the coating agent will not be directed to the "holes" of the core surface structure. Without committing oneself to any theories, this is believed to be due to the relatively small amount of solvent/carrier that is applied in the method, and the charging distribution.
  • the charging distribution guides the drops or pearls to the tops of the surface structure in the e-spray coating of the invention.
  • the coating agent layer does thus not imitate the topography of the fibre surface, at least not on the scale level of pulp fibres, but it forms a separate layer on the level of the tops. It also has to be noted that in the products according to the invention the coating agent does not typically form a uniform film onto the surface, but individual particles spread uniformly to the tops or a non-woven type net.
  • Pressurisation as assistance of e-spraying refers here to that even if a large part of the drop and/or fibre formation occurs by means of electric powers, the forming of drops and/or fibres can be assisted by means of a liquid to be sprayed or by air pressure.
  • the typical amount of coating agent on the surface of the product after one coating step is 0.0001 - 1.0 g/m 2 , preferably 0.0001 - 0.5 g/m 2 .
  • the coating agent On the surface of the product at least part of the coating agent is observed as fibres, drops, or a combination of these.
  • Another advantageous method for electrically assisted transfer is electrical spraying, i.e. the e-spray method.
  • the amount of coating agent is present on the surface of the product after one coating step is 0.00001 - 1.0 g/m 2 , preferably 0.00001 - 0.1 g/m 2 . In this case, drops or pearls of the coating agent can be observed on the surface of the product.
  • a fibre layer manufactured as a continuous web is typically functioning as the core in paper and cardboard products, either side or both sides of which can have been coated or layered with different functional layers, for example, moisture, oxygen or aroma barrier layers, and or alternatively, layers influencing other properties, such as opacity, gloss, printability, etc.
  • the fibre layer usually contains pulp fibres, but also other fibre layers are known in the field.
  • the coating agent and its possible solvent or carrier penetrate at most to the depth of one single fibre, i.e. to the depth of about 30 ⁇ m in the layer in relation to the spreading, i.e. application direction of the coating.
  • the coating will either be retained in an interface or interfaces between the layers.
  • substantially no coating agent or its solvent or carrier is observed in the fibre layer at the depth of over 50 ⁇ m from the application surface.
  • the fibre layer contains substantially no coating agent at the depth of over 50 ⁇ m from the application surface of the coating. At this depth there also is substantially no solvent or carrier originating from the treatment according to invention.
  • surface refers to the average surface alignment of the fibres in the core.
  • the paper surface is irregular and rough, when examined with a certain resolution, as is presented, for example, in the work Paper Physics, pages 89-115, Kaarlo Niskanen, Jyväskylä, Finland (1998 ).
  • the thickness of the product to be coated is, however, such that in relation to the product's overall thickness it will be sensibly possible to define the depths of the invention, into which the coating agent will penetrate and, on the other hand, will not penetrate.
  • the selection of the measuring point is not relevant and, in practice, several points can be chosen so that, for example, by using their average it is possible to exclude random extremities.
  • a coating agent applied on only a part of the product surface.
  • This kind of partial application can be made in the direction of travel of the web, i.e. as a continuous application in the longitudinal direction to part of the web width, in which case, for example, different products or a different product with different areas can be obtained after the slitting machines.
  • Partial application can also be made by matching the dosage of the coating agent as pulses in the longitudinal direction, by setting an obstacle between the nozzle and the web, or by some other method known to one skilled in the art. Also a combination of these is possible, i.e. intermittent application to only part of the web width.
  • the method for electrically assisted coating of a paper or cardboard product is characterised in that the main part of the coating agent will be retained on the surface or penetrate in the fibre layer at most to the depth of 30 ⁇ m in relation to the application surface of the coating.
  • the e-spin or e-spray method is used as electrically assisted transfer, as is presented above in connection with the product.
  • pressurisation can be used to assist in the e-pray method.
  • the method of the invention has the following steps in the said order:
  • the coating agent can be either dissolved or dispersed before the step, in which it will be formed as drops and/or fibres.
  • the coating agents there also are such agents that can, for example, be hot melt processed or otherwise taken to the nozzles without a solvent or carrier, in which case no dissolution or dispersion step will be needed.
  • the formation of drops and/or defibration is dependent on different factors with different coating agents, but some essential properties are, for example, solubility, plasticity, viscosity, electrical properties, etc.
  • drops and/or fibres will be formed of it by a nozzle in an electrically assisted manner.
  • the electrically assisted method will also be used when controlling the formed particles.
  • the said coating agent in liquid form.
  • it can also be a solution or dispersion of the coating agent.
  • Dispersion is here understood in a wide form, as is defined e.g. in the work Hawley's Condensed Chemical Dictionary, Richard J. Lewis, John Wiley & sons, (1997), page 417 , including two-phase liquid coatings.
  • a carrier thus refers to the continuous bulk phase of a two-phase system. After this, the solvent or carrier can evaporate completely or preferably partly during the flight; in other words, before the coating agent contacts the surface of the product to be coated.
  • the ratio of the amount of the coating agent to the amount of the solvent or carrier is typically smaller than in traditional methods.
  • a solvent or carrier is present when the drops or spun filaments contact the surface, in which case the solvent or carrier can participate in the formation of the film and adsorption on the surface, and then evaporate.
  • Flight refers to the travelling of the drops or spun filaments guided by pressure and/or electric current from the nozzle to the surface of the object to be coated. Different phenomena can occur during the flight, for example, the morphological formation of drops or spun filaments, evaporation of solvent or carrier, or their distribution into smaller particles, changes in charging density, etc. In the method of the invention, it has been observed that a relatively long flight distance has certain advantages.
  • the flight distance between the nozzle and the object to be coated is over 10m, typically over 40mm. In some embodiments the flight distance can be over 90mm or even over 500mm.
  • the nature of the solvent of the solution or the carrier of the dispersion according to the method of the invention can be fibre-swelling, especially water. Water is known to absorb to the fibres and remain there, swelling them. The advantages of the method of the invention become well apparent when using this liquid, which can illustratively be seen by comparing Figures 8a and 8b with each other.
  • the scope of the invention also includes an embodiment, in which the solvent of the solution or the carrier of the dispersion is non-swelling, when considering the fibres.
  • the method of the invention can be applied so that the coating is scheduled to be performed in the paper machine, especially in its coating section.
  • the coating can be performed as a separate process. Nevertheless" the coating is most preferably performed before calendering.
  • piezoelectric ultrasonic atomisers can be used as a technique assisting in the improvement of the spraying.
  • One embodiment of the invention is the use of a spray chemical treatment so that surface gluing can be omitted. In this case, the surface strength increases and dusting decreases.
  • One advantageous embodiment is to reduce the unequal sidedness of paper/cardboard by reducing the porosity/absorbancy of paper/cardboard in a controlled manner from one side and/or both sides.
  • a second advantageous embodiment is the manufacture of cardboard for electrophotography.
  • Still another advantageous embodiment is to improve the adhesion of the plastic surface of a layered cardboard by primer treatment (autoclave, oven dish PET and normal PE plastic coating).
  • One embodiment for the method of the invention is to get small water drops to a paper web by using electric charging ( Figure 2 ).
  • the method reduces significantly the amount of mist spreading to the environment when using water and highpressure nozzles (i.e. small particle size).
  • Example 1 Spray coating on a laboratory scale.
  • Uncoated cardboard (3-layer trayforma cardboard 280 gsm, 100% bleached pulp) was used as the base board.
  • Different test points were chosen from the treated area, of which the chosen parameters were defined. The points were the following: Kp 0 i.e. the reference, which was cardboard without treatment; Kp 1, in which the applied water amount was 0.2 g/m 2 ; Kp 2, in which the applied hydrophobic corn starch 0.2 g/m 2 ; Kp 3, in which 90% of hydrophobic corn starch and 10% of starch crosslinking agent were applied, in total 0.2 g/m 2 .
  • the laboratory coating was performed as spray application, in which the adding of spray was made to ensure even application by running the sheet several times through a spray nozzle. In this way it was simultaneously ensured that the amount of water added at one coating step was clearly under 1 g/m 2 .
  • the sheet had time to dry between the spray runs, and thus the adhering of the chemical to the surface of the cardboard was achieved. In this case it was seen to that the chemical would remain on the surface of the cardboard.
  • the surface structure of the cardboard had slightly swelled, which can be seen as a roughness difference between the reference (Kp 0) and the water-treated test point (Kp 1), which is shown as defined according to the Bendtsen method.
  • Reference example 2 Coating by using a large amount of water.
  • Table 2 shows the results of the application of chemicals with a spray unit (0.2 dry special starch and approximately 5-7 g/m 2 liquid). Table 2. The obtained results on a pilot scale. IGT flexo printing Kp 1 Kp2 Kp 3 Density 1.04 1.09 1.09 Mottling 100% 8.8 7.8 7.8 IGT pick ps, pi (surface strength) m/s 2.7 3.4 3.3
  • a spray made onto a hot and rather moist web with a cup cardboard recipe in a pilot paper machine improved the surface strengths relatively much.
  • the density of the IGT flexo printing and the mottling improvements were essentially smaller than anticipated by the results obtained in the laboratory, and visually there was no distinct difference in the smoothness of the paper surface.
  • Example 3 Spray application assisted with a commercial web charging system.
  • the arrival of the spray mist to the web can further be intensified by charging the spray mist differently from the web. This procedure will become possible, if very small amounts of liquid are used.
  • the situation can be improved by using surface-active agents reducing the drop size in the liquid.
  • the situation can be improved by diluting the liquid further and by increasing the temperature of the liquid.
  • it is possible to make a smaller drop size to exit from the nozzle and, due to the higher temperature, part of the liquid will evaporate before contacting the web.
  • Reference example 4 Spray application of a model agent assisted with a commercial web charging system.
  • the principle B ( Figure 2 ) was used for charging the web.
  • the paper web was a wood-containing printing paper, and the running speed was tested up to 1000 m/min.
  • Example 4 E-spray and e-spin as electrically assisted transfer, in addition pressurisation as help.
  • the base board was uncoated pulp board (3-layer Trayforma cardboard 280 gsm, 100% bleached pulp).
  • Kp0 i.e. reference, which was a cardboard without processing
  • Kp 1 in which the applied PVA amount was 0.09 g/m2
  • Kp 2 in which the applied PVA was 0.13 g/m2
  • Kp 3 in which PVA 0.22 g/m2
  • Kp 4 in which PVA 0.31 g/m2
  • Kp 5 in which PVA 0.6 g/m2.
  • the marking "->23. ⁇ .” refers to the numbering arrangement of the 85 sample points.
  • the coating was made as spray application, in which the viscosity of the chemical and the dry substance were optimised for the coating. In this case it was seen to the retention of the chemical onto the surface of the cardboard and, however, the complete drying of the chemical was prevented before penetrating into the substrate.
  • the product was not calendered after the coating, because it was desired to demonstrate the behaviour according to the invention (i.e. fibre swelling does not occur, i.e. smoothness does not deteriorate but improves). Table 3.
  • the smoothness of the application can be evaluated in Figure 5 .
  • the speed of the coated cardboard web was 600 m/min.
  • the width of the presented sample is 70 cm.
  • Optical clarification agent was added to the PCA solution, and the sample was illuminated with ultraviolet light.
  • the printing quality improved substantially, due to the strongly reduced amount of uncovered area (UCA).
  • the density of the printing ink had a visibly substantial improvement.
  • the surface strength had increased slightly.

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Claims (18)

  1. Papier- oder Kartonprodukt, bei dessen Beschichtung ein elektrisch unterstützter Transfer angewendet wurde, dadurch gekennzeichnet, dass mehr als 90 % des in dem Produkt und/oder dessen Lösungsmittel oder Träger vorhandenen Beschichtungsmittels im Wesentlichen auf der Oberfläche des Produktes verbleiben oder dass sie höchstens bis zu einer Tiefe von 30 µm, bezogen auf die Auftragsfläche der Beschichtung, in die Faserschicht eindringen.
  2. Produkt nach Anspruch 1, dadurch gekennzeichnet, dass mehr als 90 % des in dem Produkt vorhandenen Beschichtungsmittels im Wesentlichen auf der Oberfläche des Produktes verbleiben oder in die Faserschicht bis zu einer Tiefe von höchstens 20 µm, vorzugsweise 10 µm und besonders bevorzugt höchstens 5 µm, eindringen.
  3. Produkt nach Anspruch 2, dadurch gekennzeichnet, dass mehr als 99 % des in dem Produkt vorhandenen Beschichtungsmittels im Wesentlichen auf der Oberfläche des Produktes verbleiben oder in die Faserschicht bis zu einer Tiefe von höchstens 30 µm, bezogen auf die Auftragsfläche der Beschichtung, eindringen.
  4. Produkt nach Anspruch 2, dadurch gekennzeichnet, dass die Faserschicht in einer Tiefe von mehr als 50 µm, bezogen auf die Auftragsfläche der Beschichtung, im Wesentlichen kein Beschichtungsmittel enthält.
  5. Produkt nach Anspruch 2, dadurch gekennzeichnet, dass die Faserschicht in einer Tiefe von mehr als 50 µm, bezogen auf die Auftragsfläche der Beschichtung, im Wesentlichen kein Beschichtungsmittel und/oder dessen Lösungsmittel oder Träger enthält.
  6. Produkt nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Beschichtungsmittel eine retikuläre Schicht auf der Oberfläche des Produktes bildet, wobei die Schicht im Wesentlichen an den oberen Enden der Fasern mit den Fasern Kontakt hat.
  7. Produkt nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Beschichtungsmittelschicht die Topographie der FaserOberfläche nicht reproduziert.
  8. Produkt nach Anspruch 1, dadurch gekennzeichnet, dass das Beschichtungsmittel nur auf einem Teil der Oberfläche des Produktes aufgebracht ist.
  9. Produkt nach Anspruch 1, dadurch gekennzeichnet, dass als elektrisch unterstützter Transfer ein E-Spinnverfahren angewendet wird.
  10. Produkt nach Anspruch 9, dadurch gekennzeichnet, dass die Dicke des Beschichtungsmittels auf der Oberfläche des Produktes 0,0001 - 1.0 g/m2, vorzugsweise 0,0001 - 0,5 g/m2, beträgt.
  11. Produkt nach Anspruch 1, dadurch gekennzeichnet, dass als elektrisch unterstützter Transfer ein E-Sprühverfahren angewendet wird.
  12. Produkt nach Anspruch 11, dadurch gekennzeichnet, dass die Dicke des Beschichtungsmittels auf der Oberfläche des Produktes 0,00001 - 1.0 g/m2, vorzugsweise 0,00001 - 0,1 g/m2, beträgt.
  13. Verfahren zur elektrisch unterstützten Beschichtung eines Papier- oder Kartonproduktes, wobei
    das Verfahren wenigstens die Schritte (ii) und (iii) in dieser Reihenfolge umfasst:
    (i) Optional wird durch Lösen oder Dispergieren des Beschichtungsmittels in einem Lösungsmittel oder Träger eine Lösung oder Dispersion des Beschichtungsmittels hergestellt,
    (ii) das Beschichtungsmittel als solches oder die in Schritt (i) erhaltene Lösung oder Dispersion wird unter Verwendung einer Düse in einer elektrisch unterstützten Weise zu Tropfen und/oder Fasern geformt,
    (iii) die gebildeten Tropfen und/oder Fasern werden in einer elektrisch unterstützten Weise auf die Oberfläche des zu beschichtenden Substrates gelenkt, an welcher diese dann anhaften, und
    der Hauptteil des Beschichtungsmittels und/oder dessen Lösungsmittels oder Trägers verbleibt auf der Oberfläche oder dringt höchstens bis zu einer Tiefe von 30 µm, vorzugsweise höchstens 20 µm, besonders bevorzugt höchstens 10 µm und ganz besonders bevorzugt höchstens 5 µm, bezogen auf die Auftragsfläche der Beschichtung, in die Faserschicht ein.
  14. Verfahren nach Anspruch 13, dadurch gekennzeichnet, dass das Beschichtungsmittel bei Austritt aus der Düse flüssige Form und/oder die Form einer Lösung oder Dispersion aufweist.
  15. Verfahren nach Anspruch 13 oder 14, dadurch gekennzeichnet, dass es sich bei dem Lösungsmittel der Lösung oder dem Träger der Dispersion um Wasser handelt.
  16. Verfahren nach Anspruch 13, dadurch gekennzeichnet, dass als der elektrisch unterstützte Transfer ein E-Spinn- oder E-Sprühverfahren angewendet wird.
  17. Verfahren nach Anspruch 13, dadurch gekennzeichnet, dass bei dem elektrisch unterstützten Transfer die Flugstrecke zwischen der Düse und dem zu beschichtenden Objekt mehr als 10 mm und vorzugsweise mehr als 90 mm beträgt.
  18. Verfahren nach Anspruch 13, dadurch gekennzeichnet, dass das Auftragen erfolgt, während sich das zu beschichtende Objekt mit einer Geschwindigkeit von wenigstens 50 m/min, vorzugsweise 500 m/min und besonders bevorzugt mehr als 700 m/min bewegt.
EP07823075.2A 2006-08-24 2007-08-24 Verfahren zur beschichtung einer papieroberfläche und so hergestelltes produkt Active EP2061931B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL07823075T PL2061931T3 (pl) 2006-08-24 2007-08-24 Sposób powlekania papieru i produkt otrzymany w ten sposób

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20060755A FI123458B (fi) 2006-08-24 2006-08-24 Menetelmä paperi- tai kartonkituotteen päällystämiseksi ja näin saatu tuote
PCT/FI2007/000212 WO2008023093A1 (en) 2006-08-24 2007-08-24 Method for coating a paper surface and a product thus obtained

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EP2061931A1 EP2061931A1 (de) 2009-05-27
EP2061931B1 true EP2061931B1 (de) 2013-10-30

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EP (1) EP2061931B1 (de)
ES (1) ES2443719T3 (de)
FI (1) FI123458B (de)
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ2007108A3 (cs) * 2007-02-12 2008-08-20 Elmarco, S. R. O. Zpusob a zarízení pro výrobu vrstvy nanocástic nebo vrstvy nanovláken z roztoku nebo tavenin polymeru

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1550034A (de) 1967-01-05 1968-12-13
GB1285551A (en) 1969-05-28 1972-08-16 British Industrial Plastics Production of foils
BE758595A (fr) 1969-11-07 1971-04-16 Tunzini Sames Procede et installation de fabrication d'une bande de papier type "tapisserie"
DE4125059A1 (de) * 1991-07-29 1993-02-04 Ortlepp Wolfgang Beschichtungs- und/oder impraegnierungsverfahren fuer poroese nichtmetallische werkstoffe durch waermevorbehandlung
JPH10203031A (ja) * 1997-01-29 1998-08-04 Bando Chem Ind Ltd 記録用受像シートの製造方法
FI115314B (fi) * 2001-03-13 2005-04-15 Metso Paper Inc Sovitelma paperin tai kartongin käsittelemiseksi
FI115408B (fi) 2002-01-31 2005-04-29 Ciba Sc Holding Ag Menetelmä paperi- tai kartonkirainan päällystämiseksi, menetelmän käyttö ja päällystyspasta
DE102005027831A1 (de) * 2005-06-16 2006-12-28 Voith Patent Gmbh Beschichtungsverfahren

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FI20060755A (fi) 2008-02-25
EP2061931A1 (de) 2009-05-27
FI123458B (fi) 2013-05-15
ES2443719T3 (es) 2014-02-20
PL2061931T3 (pl) 2014-04-30
FI20060755A0 (fi) 2006-08-24
WO2008023093A1 (en) 2008-02-28

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