EP1994220A1 - Procede de fabrication de substrats peints une ou plusieurs fois - Google Patents

Procede de fabrication de substrats peints une ou plusieurs fois

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Publication number
EP1994220A1
EP1994220A1 EP07726593A EP07726593A EP1994220A1 EP 1994220 A1 EP1994220 A1 EP 1994220A1 EP 07726593 A EP07726593 A EP 07726593A EP 07726593 A EP07726593 A EP 07726593A EP 1994220 A1 EP1994220 A1 EP 1994220A1
Authority
EP
European Patent Office
Prior art keywords
coating composition
coating
curtain
styrene
mpa
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.)
Withdrawn
Application number
EP07726593A
Other languages
German (de)
English (en)
Inventor
Benjamin Mendez
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.)
BASF SE
Original Assignee
BASF SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BASF SE filed Critical BASF SE
Priority to EP07726593A priority Critical patent/EP1994220A1/fr
Publication of EP1994220A1 publication Critical patent/EP1994220A1/fr
Withdrawn legal-status Critical Current

Links

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
    • D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
    • D21H23/48—Curtain coaters
    • 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
    • D21H19/46—Non-macromolecular organic compounds
    • 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
    • D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/58—Polymers or oligomers of diolefins, aromatic vinyl monomers or unsaturated acids or 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
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/60—Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters
    • 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
    • D21H19/62—Macromolecular organic compounds or oligomers thereof obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • D21H19/64—Inorganic compounds

Definitions

  • the invention relates to a process for the production of mono- and / or multi-coated substrates, such as paper and cardboard, excluding photographic papers and self-adhesive label papers.
  • the curtain coating process is a process known in the art for coating in the photographic industry.
  • the emulsions and liquids used in the photographic industry have a low solids content and only a low viscosity, moreover the application rate is very slow and is less than 600 m / min.
  • graphic papers pigmented suspensions of high solids content and high viscosities are used in comparison to the suspensions used in the photographic industry.
  • graphic papers are mostly made by blade coating or film pressing at speeds well above 1000m / min. Both the blade application process and the film press application process had disadvantages that affect the quality of the coated paper.
  • the bar distribution on the paper or board surface is influenced by the unevenness of the paper substrate. Uneven bar distribution on the paper surface can lead to visual print unevenness. This quality defect is also referred to as mottling.
  • the maximum application weight achievable with the film press application method is also lower than that for the knife method (blade method). This limitation is particularly pronounced at high application speeds on the substrate to be processed.
  • JP 93/31 1931, JP 93/177816, JP 93 131718 and EP 0 517 223 B1 and EP-A 1 249 533 is the use of the curtain coating method for coating paper with one or more pigmented coating colors known.
  • EP-A 517 223 B1 already discloses a method for producing coated printing paper.
  • the produced spread paper is used in particular during printing, wherein a free-falling curtain curtain is produced from the coating liquid and the pressure base paper is coated with the deaerated coating liquid, so that the free-falling curtain curtain of the coating liquid impinges on the coating base paper. This runs continuously in a direction crossing the free-falling curtain.
  • the coating liquid comprises at least one pigment and at least one binder, a concentration between 50% by weight and 70% by weight and a viscosity between 400 and 4000 mPa.s.
  • the coating liquid is deaerated in an environment having a value of the vacuum of the saturated vapor pressure or below and under the condition that shearing is applied to the coating liquid.
  • the deaerating ratio of the bubbles having a diameter between 0.01 mm and 0.5 mm in the coating liquid is 90% or more.
  • the coating base paper has a primer layer applied by a coating method selected from the group including a blade type coating method or a roller type coating method. From EP 1 249 533 A1 a method for the production of multi-coated paper or cardboard is known. This method is used to produce multi-layer coated papers or cartons except photographic papers and self-adhesive label papers.
  • the multi-coated papers or cartons are particularly suitable for printing, packaging and for labeling purposes, in which at least two liquids to be applied, selected from aqueous solutions or suspensions, are combined as a combined, free-falling curtain and a continuous web of base paper or green cardboard is coated with the combined coating fluid.
  • DE 10 2004 045 171 A1 relates to a process for producing mono- and / or multicoated substrates.
  • These are coated paper or coated paperboard except photographic papers and self-adhesive label papers, which are particularly suitable for printing, packaging and labeling.
  • the substrate such as, for example, base paper or paperboard, is coated once or more than once with a free-flowing liquid curtain, the coating liquid in particular having an extensional viscosity of between 1 and 1000 Pa. s at a Hencky strain of between 1 and 15.
  • a coating medium to be used for curtain coating has to have special rheological properties, especially if it is used at very high machine speeds (> 1500 m / min) and / or very low coating weights ( ⁇ 8 g / m 2 ) on rough or very rough substrates such as paper or cardboard with a roughness of PPS-10> 4 microns) should be applied.
  • Coating paints are currently adjusted with anionic emulsions of the aqueous solution of a copolymer of acrylic acid and acrylamide provided with a protective oil phase.
  • the copolymers cause a thickening to increase the viscosity of the aqueous phase, because they preferentially bind the water.
  • An improvement in the water retention and extensibility of the liquid paint is due to the addition of small amounts of this adjuvant.
  • the thickening and stretching properties of the coating color i. the viscoelasticity are influenced and controlled.
  • this auxiliary (copolymer of acrylic acid and acrylamide) in the coating color, increases the thickening of the coating color and increases the dynamic tensile strength of liquid filaments or of liquid films.
  • an overdose of the auxiliary can reduce or prevent the development of microskip coating.
  • overdosing can also lead to the formation of streaks on the coated fibrous web or to various negative effects at the point of impact of the curtain on the fibrous web.
  • the present invention has for its object to expand the application areas for the curtain coating process with pigmented coating colors.
  • Slip agents may be added to the coating composition in conjunction with the addition of an anionic emulsion of a copolymer of acrylic acid and acrylamide so that better flowability and stretchability of the coating color and thus better viscoelasticity can be achieved compared to coating compositions to which the above-mentioned copolymer is blended .
  • the term "lubricant” Hend understood substances that are added in particular coating colors for curtain coating to prevent the formation of agglomerates or high fluidity by a kind of "lubricating effect" between the components of the coating color essentially pigments, binders and auxiliaries. The “lubricant” also improves the properties of the line when calendering, because the line is also softer and more flexible.
  • the added copolymer has the task of increasing the cohesion of the particles in the coating color by steric bonding (interlocking of the molecular structures) or by chemical bonding, thus increasing the dynamic yield strength of the liquid application medium and / or the coating color in the form of a liquid film, a liquid curtain or a liquid thread considerably increases.
  • the yield strength of a coating composition can be shifted by adding synthetic and / or natural "lubricants".
  • yield strength is understood to mean the maximum elongation rate and the maximum stretch factor under which a coating color is applied during the application process, in particular with the curtain coater. Exceeding the yield strength would lead to so-called Skip Coating or Microskip Coating. Under Microskip Coating the local tearing of the coating medium or the liquid film is understood, with microscopic holes in the applied coating or the applied layer on the substrate or the fibrous web are caused. These microscopically small uncovered spots on the coated fibrous web significantly deteriorate the printability properties of paper and board.
  • the stretching rate ⁇ * of a coating composition is defined according to the invention by means of the following mathematical formula:
  • the stretching factor is also defined according to the invention, wherein
  • V 0 is to be understood as the outflow velocity of the ink from the nozzle gap and Vi mp is the impact velocity of the curtain on the substrate.
  • the following stretch factors and strain rates occur when the machine speed is in the range of 500 to 2500 m / min and the coating weights are applied in the range between 6 to 30 g / m 2 at high solids contents.
  • lubricants incorporated with the coating composition of the present invention include stearin and similar lubricants such as PVA, starch and oleaginous additives in conjunction with said acrylic copolymer based thickeners.
  • the critical expansion rate and critical elongation factor are to be understood as those maximum values of the abovementioned variables, from which microskip coating and banding occur by overstretching of the released medium, for example in the form of the liquid curtain.
  • Calcium stearate is particularly suitable for coating colors that are applied with a curtain coater. Calcium stearate is typically a compound of 94% vegetable stearin and 5% elemental calcium.
  • Dispersions of calcium stearate are weakly alkaline and have a nonionic charge character. They are also emulsified well in water in any mixing ratio, which makes them particularly suitable for coating colors.
  • anionic thickeners listed below such as, for example, ethyl acrylate and carboxylic acids (without or with plasticizers and without solvents). sestoff), acrylic acid and acrylamide in an oil phase, acrylic acid, acrylate and acrylonitrile (with or without plasticizers and without solvents) and with other thickeners, such as CMC (carboxymethylcellulose) can be a particularly good stretchability and processability of pigmented coating colors, especially when achieve a set in a curtain commissioned work.
  • anionic thickeners listed below such as, for example, ethyl acrylate and carboxylic acids (without or with plasticizers and without solvents). sestoff), acrylic acid and acrylamide in an oil phase, acrylic acid, acrylate and acrylonitrile (with or without plasticizers and without solvent
  • the thickener or acrylic copolymer may be added together with the stearate or stearin.
  • the stearin or the calcium stearate used thereby reduces or prevents the formation of coagulum in the coating colors.
  • Calcium stearate further imparts to the coating composition a slightly water repellent character which can improve the water resistance of the coated substrate such as a paper or a cardboard.
  • Stearates, such as calcium stearate also have a mild defoaming effect. This additional property is desirable in the production of a coating color.
  • the coating composition may be prepared including the "lubricant" in the following order:
  • binders styrene, butadiene or acrylic latex, starch, PVA
  • thickeners and extensional rheology regulators for example copolymers of acrylic acid and acrylamide
  • the dosage of the stearate or stearin depends on the selected pigment system and the thickener type. Good results can be achieved, for example, with 0.8 part of calcium stearate per 0.2 to 0.5 part of thickener (for example with the abovementioned acrylic polymers). It has proved to be particularly advantageous if coating colors based on pure carbonate, ie 100 wt .-% CaCO 3 are prepared. This coating color may contain 0.5 to 0.8 parts of stearate and 0.3 to 0.6 parts of thickener to positively influence the rheological properties.
  • Another alternative is to produce mixtures of carbonate and kaolin. These may in some cases contain a higher proportion of stearate, for example 0.6 to 0.8 parts, and a higher amount (0.4-0.6 parts) of thickener, in order to be able to develop favorable rheological properties at high substrate delivery rates.
  • lubricants include, for example, wax emulsions or wax powders based on natural or synthetic waxes, PTFE wax emulsions or powders, polyvinyl acetate / polyvinyl alcohol or polyvinylformamide / polyvinylamine with different saponification degrees.
  • silicone resin emulsions or inorganic lubricants such as talc particles can be used.
  • polymers such as polyethylene glycol, polytetrahydrofuran and polyvinylpyrrolidone can be used with different molecular weights.
  • the substrate is coated one or more times with the coating liquid of a free-falling liquid curtain, wherein the coating liquid has an extensional viscosity, measured by the CaBER method between 1 and 10,000 Pa. s at a Hencky strain of between 1 and 15.
  • the coating colors preferably used when using the method proposed according to the invention have the compositions listed below. All percentages given are based on dry weight fractions.
  • a coating composition based on CaCO 3 is used, for example a 77% slurry of calcium carbonate with a particle size of 90% ⁇ 2 ⁇ m (Hydrocarb 90 ME, available from OMYA, Oftringen, Switzerland), and a 74.6 % Premium Clay Slurry from Amazon Premium with a particle size of 98% ⁇ 2 ⁇ m (Amazon Plus available from Kaolin International). Further, the coating colors may contain a binder A of styrene-butadiene latex (Styronal® D 536 available from BASF AG, Ludwigshafen), 50% in water.
  • an ASE thickener available from BASF AG (additive C) and, alternatively or in combination, an additive A, polyacrylamide thickener (40 mol% acrylic acid, 60 mol% acrylamide, 20 million molecular weight) and an additive B, polyacrylamide thickener (40 mol% acrylic acid, 60 mol% acrylamide, 44 million molecular weight) admix.
  • the coating colors comprise a surfactant in the form of an aqueous solution of sodium dialkylsulphosuccionates (Lumiten® I-DS 3525), also available from BASF AG.
  • the coating colors used in the process proposed according to the invention may be admixed with an optical brightener, for example in the form of Blancophor® P, available from Bayer AG, Leverkusen.
  • the extensional viscosity of the coating liquid, i. the coating color is between 1 and 1000 Pa. s, measured by the Ca B ER method at a Hencky strain of between 1 and 15. Preferably, the extensional viscosity is between 5 and 500 Pa. s, measured by the CaBER method at a Hencky strain of between 1 and 12, and more preferably the extensional viscosity of the coating color is between 10 and 100 Pa. s, measured by the CaBER method at a Hencky strain of between 1 and 8.
  • the shear viscosity (100 rpm Brookfield) of the coating liquid is between 0 and 5000 mPa.s, preferably between 0 and 2000 mPa.s, and particularly preferably the coating liquid has a shear viscosity (100 rpm Brookfield) between 0 and 1000 mPa.s.
  • the coating liquid may have a solids content of between 40% and 75%, preferably between 50% and 75%, and most preferably between 60% and 65%.
  • the free-falling liquid curtain comprises at least one binder selected from the group consisting of styrene-butadiene latex binder, ethylene acrylic acid waxes, polyethylene, polyester, styrene-alkylacrylate latex binder, styrene-butadiene-acrylonitrile latex binder, styrene-maleic anhydride binder, styrene-acrylate maleic anhydride binder, polysaccharides, proteins , Polyvinylpyrrolidones, polyvinylalcohol, polyvinylacetate, cellulose and cellulose derivatives.
  • binder selected from the group consisting of styrene-butadiene latex binder, ethylene acrylic acid waxes, polyethylene, polyester, styrene-alkylacrylate latex binder, styrene-butadiene-acrylonitrile latex binder, styrene-maleic anhydride binder,
  • the free-falling liquid curtain contains organic and / or inorganic pigments selected from the group comprising kaolin, talc, calcium carbonate, precipitated calcium carbonate, titanium dioxide, satin white, synthetic polymer pigments, zinc oxides, barium sulphates, gypsum, silica and aluminum trihydrate.
  • organic and / or inorganic pigments selected from the group comprising kaolin, talc, calcium carbonate, precipitated calcium carbonate, titanium dioxide, satin white, synthetic polymer pigments, zinc oxides, barium sulphates, gypsum, silica and aluminum trihydrate.
  • Danben comprises the free-falling liquid curtain of coating color polyacrylamides having a molecular weight Mw of from 1 to 50 million, preferably a molecular weight Mw of from 5 to 45 million and more preferably the free-falling liquid curtain contains polyacrylamides having a molecular weight Mw of 20 to 40 million.
  • the Brookfied viscosity of the free-falling liquid curtain is between 20 to 5000 mPa.s, preferably between 20 mPa.s to 2000 mPa.s and more preferably between 20 mPa.s to 1300 mPa.s (spindle no. 2).
  • the coating weight of the coating color is in the range between 0.1 g / m 2 to 50 g / m 2 .
  • the pH of the pigmented coating formulations outlined above was adjusted to 8.7 by addition of 10% aqueous NaOH solution.
  • the solids content of the coating formulations outlined above was adjusted by dilution with water.
  • Associative thickeners may be used in the additives added in coating colors.
  • the associative thickeners are able to adsorb via hydrophobic groups in the molecule on the surface of the binder particles and to form cell-like, associative complexes in the water phase. This makes it possible to specifically raise the viscosity of the coating colors at medium and high shear rates in binder-rich formulations.
  • hydrophobically modified types are generally disseminated starting from HEC or EHEC.
  • these thicken rather conventionally and usually show only a weak associative interaction with the binder particles.
  • Polyurethane thickeners usually comprise polyethylene glycols, the isocyanates (for example hexamethylene diisocyanate) and hydrophobic long-chain alcohols having polymers which have a kind of triblock structure. In its center is the rather hydrophilic polyurethane block, whereas the chain ends are hydrophobically modified by the long-chain alcohol.
  • Suitable thickeners for coating compositions or coating colors are, in addition to free-radical (co) polymers, customary organic and inorganic thickeners, such as hydroxyethyl cellulose or bentonite.
  • ionic or anionic polyacrylamides and polyvinylformamides can be used as additives.
  • binder polymers are not limited to a particular method. Rather, all known processes for polymer production can be used. Preference is given to using the processes of emulsion polymerization, suspension polymerization, microemulsion polymerization or microsuspension polymerization which make use of free-radical polymerization.
  • water-in-oil emulsions of the polymer are generally obtained with solids contents of from 10 to 50% by weight, preferably from 20 to 40% by weight.
  • the thickeners are used individually, but it is quite possible to use thickener mixtures.
  • the associative thickeners or PAM's described above represent a selection of rheological additives which can be added to the coating composition proposed by the invention.
  • the coating effects can be considerably minimized in the context of an application method to a substrate to be coated, such as paper or paperboard, as shown in detail in the examples below.
  • the extensional viscosity of the coating color proposed according to the invention is determined in a so-called CaBER experiment, in which case a liquid thread or film is formed whose thickness subsequently decreases under the influence of the surface tension ⁇ as a dominant force.
  • the temporal decrease of the film thickness D m ⁇ d (t) is measured. From this, the tensile viscosity ⁇ E , a PP is determined according to the following relationships.
  • the proposed solution according to the invention allows in the experiment, the striking of 7.9 g / m 2 at speeds up to 2500 m / min without the occurrence of Skip Coa- ting at a solids content of 64.4% and at a Brookfield viscosity of 1300 mPa. s.
  • a coating weight of 6 g / m 2 at a solids content of 68.4% and at a viscosity of 2650 mPa.s to the substrate with good quality and good runnability with a curtain Application work (Curtain Coater) could be applied.
  • additives besides calcium stearate are used in the sense of the solution proposed according to the invention in order to positively influence the properties of the coating composition for curtain coating.
  • further additives include, for example, wax emulsions or powders based on natural or synthetic waxes, PTFE wax emulsions or powders, polyvinyl acetate / polyvinyl alcohol or polyvinylformamide / polyvinylamine with different degrees of saponification.
  • silicone resin emulsions or inorganic lubricants such as talc particles can be used.
  • polymers such as, for example, polyethylene glycol, polytetrahydrofuran or polyvinylpyrrolidone with different molecular weights. Due to the already mentioned steeper course of the viscosity ⁇ as a function of the elongation and shear rate, an increase in the maximum yield strength of the coating color is achieved, further improving the film-forming properties and optimizing the flowability, ie all the processability of the coating color favors properties and properties that the Quality of the substrate obtained, be it a film, be it a cardboard, be it significantly improve a paper web or the like.
  • polymers such as, for example, polyethylene glycol, polytetrahydrofuran or polyvinylpyrrolidone with different molecular weights. Due to the already mentioned steeper course of the viscosity ⁇ as a function of the elongation and shear rate, an increase in the maximum yield strength of the coating color is achieved, further improving the film-forming properties and optimizing the flowability, ie all the processability of
  • a prerequisite for the achievement of a positive effect is sufficient compatibility with the other constituents of the coating composition for all substances, so that no agglomerates or coagulates are formed.
  • Agglomerate or coagulum formation can be achieved by means of suitable aqueous formulations using suitable emulsifiers.
  • the viscosity of the coating colors according to the respective formulations listed below was determined by means of a Brookfield Viscometer (RVT), available from Brookfield Engineering Laboratories, Inc., Stoughton, Massachusetts USA, at a temperature of 25 ° C. To measure the Brookfield viscosity, 600 ml of the dispersion was placed in a 1 liter receiving beaker and the viscosity was measured with spindle # 4 at spindle RPM of 100 rpm. The coating colors according to the following formulations were applied to the substrate (paper, cardboard) by curtain coating.
  • RVT Brookfield Viscometer
  • a Haake CaBER 1 device from ThermoElectron was used to determine the extensional rheology of the coating colors.
  • the sample liquid (coating color) is applied between two punches.
  • the diameter of the cylindrical punch is 6 mm, the gap between the punches 3 mm and the final gap height 11 mm.
  • the sample liquid drop is stretched from 3 mm to 11 mm. This forms a liquid thread.
  • the thread diameter (Dmid) is detected by means of a laser micrometer in the middle between the two punches.
  • the extensional viscosity is determined by the following formulas.
  • FIGS. 1 and 2 show an alternative embodiment of a device for applying coating slip to a web-shaped substrate in accordance with the curtain coating method.
  • FIG. 1 shows an application device 1 with which the upper side of a web-shaped substrate 2 is coated.
  • a film 3 emerging from an opening of the applicator 1 strikes the top of the web-like substrate 2 at an application point 4.
  • the web-shaped substrate 2 is guided in the conveying direction 7 via a first deflection roller 5 and a second roller 6.
  • the point of impingement 4 of the film 3 lies on the upper side of the web-shaped substrate 2.
  • FIG. 2 shows the application device 1 according to the illustration in FIG. 1 on an enlarged scale.
  • the application device 1 comprises a nozzle body 8, on the underside of which an outlet opening 9 is located.
  • the coating ink stored in the nozzle body 8 according to the composition discussed in Examples 1 to 6 emerges from the outlet opening 9 in the form of a film 3, whereby the film 3 continuously tapers in the direction of the application site 4 and on the application site 4 onto the surface 10 of the web-shaped substrate 2 impinges.
  • the film 3 is accelerated and forms on the underside of the outlet opening 9, perpendicular to the plane of the drawing, as a curtain extending over the width of the web-shaped substrate 2. After the exit of the film 3 from the outlet opening 9, this contracted and is deflected at the point of impact 4.
  • the surface 10 of the web-shaped substrate 2 has a roughness 1 1; Corresponding to the roughness 11 of the surface 10 of the web-shaped substrate, a film thickness 12 of the coating color forms on the surface 10 of the web-shaped substrate 2.
  • the sheet-like substrate 2 may be paper, cardboard or even plastic films or the like.
  • An air scraper 13 serves to retain the air layer entrained by the substrate surface.
  • an aqueous pigment dispersion is first prepared.
  • pigments are mixed with supplied water until the desired solids content and the desired viscosity are reached.
  • the viscosity of the slurry is preferably set very low for degassing. It is less than 500 mPa.s (Brookfield 100 rpm 20 ° C), preferably less than 200 mPa.s (Brookfield 100 rpm 20 ° C).
  • pigments e.g. Calcium carbonate, kaolin, titanium dioxide or talc can be used.
  • the binder may be added to the pigment dispersion in the container if it does not interfere with the subsequent degassing.
  • the binder can also be admixed only after degassing.
  • the degassing takes place within a degassing device, in which the supplied dispersion is sprayed at reduced pressure.
  • the gases emerging from the dispersion in particular air, are discharged from the container.
  • the dispersion is distributed over a large surface at very low absolute pressure.
  • an enlargement of the O ber Structure on the use of centrifugal plates would be conceivable.
  • the pigmented dispersion can then be admixed with the thickener and the additives in the absence of air.
  • the degassing device can for
  • Example two degassing stages connected in series, in which the coating degassing is carried out continuously in succession before the thickener and the additives are mixed under exclusion of air.
  • the degassing stages contain spray degasser with an evacuable container.
  • For conditioning the coating color of the first degassing can be preceded by a tempering in which the desired temperature of the coating color can be adjusted by heating or cooling.

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  • Paper (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)

Abstract

L'invention concerne une composition de revêtement coloré pour une unité d'application de rideaux (Curtain Coater) destiné à enduire une ou plusieurs fois, d'un ou des deux côtés, une bande de papier, de carton ou autre matériau fibreux en mouvement, la composition de revêtement coloré contenant, outre des pigments et des liants, des agents lubrifiants.
EP07726593A 2006-03-06 2007-03-02 Procede de fabrication de substrats peints une ou plusieurs fois Withdrawn EP1994220A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07726593A EP1994220A1 (fr) 2006-03-06 2007-03-02 Procede de fabrication de substrats peints une ou plusieurs fois

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP06110687 2006-03-06
PCT/EP2007/051999 WO2007101822A1 (fr) 2006-03-06 2007-03-02 Procede de fabrication de substrats peints une ou plusieurs fois
EP07726593A EP1994220A1 (fr) 2006-03-06 2007-03-02 Procede de fabrication de substrats peints une ou plusieurs fois

Publications (1)

Publication Number Publication Date
EP1994220A1 true EP1994220A1 (fr) 2008-11-26

Family

ID=38169545

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07726593A Withdrawn EP1994220A1 (fr) 2006-03-06 2007-03-02 Procede de fabrication de substrats peints une ou plusieurs fois

Country Status (4)

Country Link
EP (1) EP1994220A1 (fr)
JP (1) JP2009529076A (fr)
CN (1) CN101432484A (fr)
WO (1) WO2007101822A1 (fr)

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JP5759449B2 (ja) * 2010-03-18 2015-08-05 日本製紙株式会社 印刷用塗工紙およびその製造方法
WO2011127268A1 (fr) * 2010-04-07 2011-10-13 Hercules Incorporated Compositions aqueuses stables de polyvinylamines à amidon cationique, et installation de fabrication de papier
KR101455187B1 (ko) * 2011-03-29 2014-10-27 니뽄 세이시 가부시끼가이샤 인쇄용 도공지 및 그 제조 방법
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