EP2537981B1 - Method for treating the surface of paper and paper - Google Patents
Method for treating the surface of paper and paper Download PDFInfo
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- EP2537981B1 EP2537981B1 EP12004649.5A EP12004649A EP2537981B1 EP 2537981 B1 EP2537981 B1 EP 2537981B1 EP 12004649 A EP12004649 A EP 12004649A EP 2537981 B1 EP2537981 B1 EP 2537981B1
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- paper
- surface treatment
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- 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
- D21H19/38—Coatings with pigments characterised by the pigments
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- 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
Definitions
- the present invention relates to a process for the surface treatment of paper, in particular inkjet printable paper, wherein on a base paper containing cellulose fibers and optionally fillers, an optical brightener, retention aids or colorants or pigments, an aqueous solution containing at least one water-soluble salt of a divalent metal and optionally one or more substances selected from a binder, a pigment, a surface sizing agent and / or cationic polymer is applied, and to a paper thus prepared.
- Paper which is a complex product composed of various natural cellulose fibers with pigments, fillers and the like, has very different properties depending on the composition or raw materials used.
- this complex composition which forms the base material of paper, a plurality of different substances are added or the paper can after forming a base paper from a pulp and optionally pressing and drying a surface treatment be subjected to give the paper the desired specific properties.
- the choice of additives to the paper in the dewatering process, during drying and in improving the retention plays a major role.
- cationic polymers, nanoparticles or several polymers are added at the same time.
- hydrophobic sizing agents which are often added in the form of emulsions and / or dispersions and serve to attach to the fiber or filler surfaces and thus make them hydrophobic.
- composition suitable for surface treatment of a substrate for ink-jet printing and more particularly for increasing the color density of a printing ink on paper, which composition contains a divalent metal ion salt soluble in an aqueous sizing medium and additionally contains starch and sizing agent as sizing agent.
- this composition the ink jet printability of the ink density on paper should be improved.
- a coating composition for an ink-jet printable paper comprising a calcium carbonate pigment, a metal salt drying agent, a cationic dye fixing agent, a pigment binder and optionally a plastic pigment, and optionally an optical brightener, wherein the amount of the calcium carbonate pigment is of the order of 70-95% by weight. the coating composition is present.
- An ink jet recording sheet has become known for use with pigment-based inks wherein at least one of the usable surfaces of the recording sheet has become known as a combination of a water-soluble cationic substance and a water-soluble binder such as polyvinylpyrrolidone, polyacrylamides, starches and gelatin.
- a recording sheet for use in digital printing comprising a surface treatment layer containing a water-soluble cationic substance such as a soluble polyvalent metal salt and a water-soluble binder substance, which is subjected to such coated paper of a handling device in a digital printing process.
- a paper release sheet is removable whose surface has been treated with water-soluble calcium chloride to improve printability.
- WO 2011/019866 A1 From the WO 2011/019866 A1 is known inkjet printable paper, in which on a base paper, a coating comprising at least two mutually different pigments is applied, which pigments in particular have mutually different particle sizes.
- a further magnesium sulfate-containing coating may be applied to this coating or coating.
- a recording medium for ink-jet printing in which at least one coating comprising at least one water-soluble salt of a di- or tetravalent metal as well as a cationic material is applied to a carrier material.
- the variety of divalent or tetravalent metal salts mentioned in this document does not mention magnesium sulfate.
- an image recording method of causing an ink to adhere to a recording medium which recording medium contains at least an ink receiving layer on a base material, which ink receiving layer comprises fine inorganic particles and a water-soluble resin and / or water-dispersible resin, and the surfaces of pH Ink receiving layer is controlled in the range 3.0 and 6.5.
- the present invention now aims to provide a method for producing paper or a paper which is easy to carry out and in which by using less constituents a paper can be produced, on which an at least equivalent color density as with products according to The prior art can be achieved in printing and at the same time less bleeding, discarding of the paper, fraying and an improved color-in-color course of the paper after printing and a faster drying time of the printing ink is made possible on the paper.
- the inventive method is characterized in that from a pulp containing as the main component cellulose, between 0 and 50 wt .-%, in particular 10 and 30 wt .-% CaCO 3 as a filler and optionally an optical brightener or a retention aid, an unsized base paper is formed, and that the base paper is coated with a liquid surface treatment medium containing between 1 and 20 kg / t paper of MgSO4 and that the paper is optionally subjected to a post-treatment step and drying.
- a non-sized base paper is prepared, and this unsized base paper with a liquid surface treatment medium containing between 1 and 20 kg / t magnesium sulfate and optionally other additives is coated and the paper is optionally subjected to a post-treatment, succeeds in extremely few steps, a To produce paper on which in addition to the base paper forming main constituents cellulose and calcium carbonate as filler additionally only magnesium sulfate must be applied as a surface treatment medium.
- Magnesium sulphate forms a monohydrate on the surface of the paper during papermaking since higher temperatures than 68 ° C. prevail during drying on the surface. At room temperature, the stable form is the magnesium sulfate.
- Form stability of the paper improved because the water absorbed by magnesium sulfate can not contribute to the swelling of the fibers and thus the bulging of the paper is prevented at the printed areas.
- the calcium chloride frequently used in surface treatment agents forms a dihydrate at the temperatures of papermaking, but at room temperature a hexahydrate.
- a dry calcium chloride used in a unit of mass can only absorb about 0.65 mass units of water, so that the magnesium sulfate used in the context of the present invention is 38% more effective in absorbing water than the commonly used calcium chloride.
- the liquid contained in the ink can be rapidly and reliably absorbed by the surface treatment medium, magnesium sulfate
- the point size of a treated with magnesium sulfate paper is significantly lower than that of a treated with calcium chloride paper, whereby it succeeds in such a procedure surprisingly by using extremely few and selectively selected ingredients to produce a paper which in quality at least one conventional Paper, which in addition to the surface treatment usually also contains sizing agents, pigments and other additives corresponds.
- the water-soluble magnesium sulfate When printed with water-based pigment inks or water-based pigment ink, the water-soluble magnesium sulfate may partially dissolve in the ink, thereby destabilizing the pigment dispersion and coagulating the color pigments.
- the coagulated color pigment remains on the surface of the paper and does not penetrate with the liquid into the interior thereof, and therefore the paper treated with magnesium sulfate according to the invention has a higher color density when printed with water-based pigment inks than an untreated paper.
- Another advantage of the method according to the invention is the replacement of the usually contained, highly corrosive chloride by less corrosive sulfate, so that the life of the application unit for the surface treatment is extended and the life of the wear parts in the application unit, such as the metering rods, increased. Likewise, in the recycling of rejects, the entry of corrosive chloride into the water cycle of the paper machine is reduced.
- the paper is subjected to calendering or smoothing as a post-treatment step, despite the absence of internal sizing agents or other additives, it is possible to produce a smooth paper which has no distortions and which in any modern printer can be used to provide. It is also irrelevant hiebei, whether it is an inkjet printing or laser printing.
- the paper to a smoothness between 60 and 150 Bekk s. is calendered, the fraying of the ink along the fibers is reduced and is comparable to a paper which has been treated with a hydrophobing by an inner and / or a surface sizing agent.
- the paper according to the invention is well and advantageously suitable for use in inkjet printing or even in laser printing without the formation of distortions.
- the process according to the invention is carried out such that the MgSO 4 solution is used as 0.5 to 20% strength by weight, in particular 1 to 5% strength by weight, aqueous solution.
- the MgSO 4 solution is used as 0.5 to 20% strength by weight, in particular 1 to 5% strength by weight, aqueous solution.
- a particularly good fixation of the paper surface is achieved by using the polydiallyldimethylammonium chloride polymer in an amount of 1 to 12 kg / t of paper in the surface treatment medium.
- the polydiallyldimethylammonium chloride polymer in an amount of 1 to 12 kg / t of paper in the surface treatment medium.
- favorable properties of a paper produced according to the method of the present invention can be achieved by using as a liquid surface treatment medium 1 to 20 kg / t of paper, in particular 6 to 10 kg / t of paper MgSO 4 and 1 to 12 kg / t of paper, in particular 4 kg / t paper polydiallyldimethylammonium chloride polymer is used.
- a binder such as a native or modified starch, a polyvinyl alcohol or mixtures thereof, is used, it is possible to produce a continuous layer on the surface form of the paper, which is characterized by an extremely high uniformity, so that not only the dye-binding properties but also in particular the uniformity of the printability of the paper is significantly improved by such a procedure.
- the process according to the invention is conducted in such a way that a disulphonated, tetrasulphonated, hexasulphonated optical brightener or a distyrylbiphenyl brightener is used.
- a disulphonated, tetrasulphonated, hexasulphonated optical brightener or a distyrylbiphenyl brightener is used.
- Magnesium sulfate is reduced to a significantly lesser extent than, for example, calcium chloride, so that with such process control a significantly better whiteness of the paper can be achieved compared to papers to which, for example, salts of other divalent metal ions have been added.
- optical brightener is used both in the base paper and the surface treatment medium.
- a uniformly high color density can be achieved by additionally using in the surface treatment medium a pigment selected from the group milled, precipitated or modified CaCO 3 or mixtures thereof becomes.
- the surface treatment with a pigment alone increases the ink density in inkjet over an untreated paper, the additional use of MgSO4 according to the invention leads to a further improvement in the color density, so that the use of this combination according to the invention both in papers containing a pigment as well Papers that contain no pigment leads to surprisingly beneficial and unexpected results.
- the process according to the invention can thus be used with equal success both for the production of pigmented and for the production of non-pigmented paper.
- the process is preferably carried out so that the surface treatment medium additionally a viscosity regulator, such as a polyacrylate is added.
- a viscosity regulator such as a polyacrylate
- the process according to the invention is preferably carried out in such a way that the binder, especially the starch is a crosslinking agent, such as a zirconium salt is added.
- the process according to the invention is preferably conducted in such a way that a lubricating medium is added to the surface treatment medium.
- a lubricating medium is added to the surface treatment medium.
- calcium stearate has proven to be advantageous, which results in both an increased smoothness and a good printability of the paper.
- the inventive method is performed so that the total solids content of the surface treatment medium between 15 to 70 wt .-%, in particular 30 to 50 wt. % is selected.
- the total solids content of the surface treatment medium is between 15 to 70% by weight, especially between 30 and 50% by weight, a uniform stroke of the base paper can be achieved, and additionally the thickness of the surface layer obtained by applying the surface treatment medium to the base paper can be set arbitrarily and in particular to a minimum requirement.
- a weight of a dry surface coating 1 to 10 (g / m2 side), in particular about 4 (g / m2 side) is achieved.
- weight of a dry surface coating corresponds to the weight which is conventionally applied to printed papers and according to the present invention can be achieved with an extremely simple process procedure in which only magnesium sulfate must be contained in the surface treatment medium.
- the present invention relates to a paper produced according to the method of the present invention, which is preferably usable for ink-jet printing.
- a paper is preferably essentially characterized in that a contact angle of water, in particular distilled water with the paper is between 15 ° and 70 °, in particular between 25 ° and 50 °.
- aqueous solutions of poly-DADMAC Polydiallyldimethylammoniumchlorid
- concentrations were chosen such that with a two-sided wet application of 12 (g / m 2 side) the content of polyDADMAC 4.7 kg / t, CaCl2 or MgSO4 3 to 10 kg / t coated paper would be. In fact, however, only one side was coated with 12 g / m2 wet application of the corresponding solution and dried.
- the coated side was printed on a HP Photosmart B9180 printer using the "Standard / Plain Paper” settings using pigment inks.
- an X-Rite DensiEye 700 color densitometer With an X-Rite DensiEye 700 color densitometer, the color densities of solid areas of cyan (C), magenta (M), yellow (Y), and black (K) and binary colors red (100M + 100Y), green (100C + 100 Y) and blue (100 C + 100 M).
- Fig. 1 the average of the 7 measured color densities is plotted against the salt content (calculated on double-sided application).
- an unprimed 90g / m 2 basis weight paper from a pulp suspension containing 15% by weight of filler was precipitated Calcined calcium carbonate (PCC) based on the dry content of the suspension, and in a film press a surface treatment medium consisting of an aqueous solution of 2.0 wt .-% magnesium sulfate and 1.0 wt .-% poly-DADMAC, applied on both sides, that the content of magnesium sulfate in the finished paper was 7 kg / t.
- the paper was smoothened to a smoothness of 105 Bekk s.
- a sized paper of 90 g / m 2 basis weight was formed from a pulp suspension containing as filler 18% by weight of precipitated calcium carbonate (PCC) based on the solids content of the suspension.
- the sizing agent used was alkenyl succinic anhydride (ASA) and the sizing amount was adjusted so that the 60 s Cobb value of the finished paper was 30 g / m 2.
- ASA alkenyl succinic anhydride
- ASA alkenyl succinic anhydride
- ASA alkenyl succinic anhydride
- CaCl 2 a surface area treatment medium consisting of an aqueous solution of 10% by weight of enzymatically degraded corn starch and 1.8% by weight of CaCl 2 was applied so that the content of CaCl 2 in the finished paper was 6 kg / t.
- the roughness was set to a standard value for natural papers of 200 ml / min according to Bendtsen.
- the papers of Embodiment 2 and Reference Example 1 were printed with various printers and the color densities measured as indicated above. In addition, the color density of the black panel on the back of the paper was measured as a measure of ink bleed.
- the printers used were an HP Photosmart B9180 with the standard pigment inks and print settings "standard / plain paper", a Canon MP610 with standard dye inks and print settings "high / glossy photo", an Epson Stylus S21 filled with Kodak Versamark dye inks from the FV2000 series and the Print settings "Design / Epson glossy” and an Epson Stylus SX218 filled with Océ Jetstream 1000 dye inks and the print settings "Photo, Epson Photo” used.
- the last two printers were filled with inks from high speed production inkjet printing machines to simulate the performance of the paper on these presses.
- Epson Stylus S21 adapts with Kodak Versamark dye inks (FV2000 series) Settings: Design, Epson glossy template Dense cyan Dense magenta Dense yellow Dense red Dense green Dense blue Dense black Density ⁇ Dense black punch 100% parentssbsp.
- Epson SX218 adapts with Océ Jetstream 1000 dye inks Settings: Photo, Epson Photo template Dense cyan Dense magenta Dense yellow Dense red Dense green Dense blue Dense black Density ⁇ Dense black punch 100% reportssbsp. 2 1.13 0.98 1.22 1.19 1.20 1.39 1.11 1.17 0.19 Reference Example 1 0.89 0.87 1.11 1.16 0.98 1.12 1:04 1.02 0.18 * punctuates punctually
- FIGS. 2 and 3 show the time course of contact angle and drop volume after a 4 .mu.l drop of distilled water has been applied to the paper.
- the contact angle clearly shows the difference in the hydrophobization between the glued reference example and the unsized embodiment.
- the decrease in the drop volume shows the clear advantage in the absorption rate of the drop in the paper according to Embodiment 2.
Description
Die vorliegende Erfindung bezieht sich auf ein Verfahren zur Oberflächenbehandlung von Papier, insbesondere von mit Tintenstrahldruck bedruckbarem Papier, bei welchem auf ein Basispapier, enthaltend Cellulosefasern sowie gegebenenfalls Füllstoffe, einen optischen Aufheller, Retentionshilfsmittel oder Färbemittel bzw. Pigmente, eine wässrige Lösung, enthaltend wenigstens ein wasserlösliches Salz eines zweiwertigen Metalls sowie gegebenenfalls eine oder mehrere Substanzen gewählt aus einem Bindemittel, einem Pigment, einem Oberflächenleimungsmittel und/oder kationischen Polymer aufgebracht wird, sowie auf ein derart hergestelltes Papier.The present invention relates to a process for the surface treatment of paper, in particular inkjet printable paper, wherein on a base paper containing cellulose fibers and optionally fillers, an optical brightener, retention aids or colorants or pigments, an aqueous solution containing at least one water-soluble salt of a divalent metal and optionally one or more substances selected from a binder, a pigment, a surface sizing agent and / or cationic polymer is applied, and to a paper thus prepared.
Papier, welches ein komplexes, aus verschiedenen natürlichen Zellulosefasern mit Pigmenten, Füllstoffen und dgl. zusammengesetztes Produkt ist, weist je nach Zusammensetzung bzw. verwendeten Ausgangsmaterialien stark unterschiedliche Eigenschaften auf. Um die Eigenschaften des Papiers an die spezifischen Erfordernisse anzupassen, kann einerseits dieser komplexen Zusammensetzung, welche den Grundstoff von Papier ausbildet, eine Mehrzahl unterschiedlicher Substanzen zugesetzt werden oder aber das Papier kann nach Ausbildung eines Basispapiers aus einer Pulpe sowie gegebenenfalls einem Pressen und Trocknen einer Oberflächenbehandlung unterzogen werden, um dem Papier die gewünschten spezifischen Eigenschaften zu verleihen. Hierbei spielt beispielsweise die Wahl der Zusatzstoffe zu dem Papier in dem Entwässerungsverfahren, während des Trocknens und bei der Verbesserung der Retention eine große Rolle. Zur Verbesserung der Retention werden hierzu beispielsweise kationische Polymere, Nanopartikel oder mehrere Polymere gleichzeitig zugesetzt. Die Wirkung dieser Polymeren ist es, kolloidale Teilchen an den Faseroberflächen zurückzuhalten, ohne eine Ansammlung derselben zwischen den Fasern zu bewirken. Andere wichtige Zusatzstoffe für die Modifikation des Basispapiers sind hydrophobe Leimungsmittel, welche häufig in Form von Emulsionen und/oder Dispersionen zugesetzt werden und dafür dienen, sich an den Faser- bzw. Füllstoffoberflächen anzulagern und diese somit hydrophob zu machen.Paper, which is a complex product composed of various natural cellulose fibers with pigments, fillers and the like, has very different properties depending on the composition or raw materials used. In order to adapt the properties of the paper to the specific requirements, on the one hand this complex composition which forms the base material of paper, a plurality of different substances are added or the paper can after forming a base paper from a pulp and optionally pressing and drying a surface treatment be subjected to give the paper the desired specific properties. Here, for example, the choice of additives to the paper in the dewatering process, during drying and in improving the retention plays a major role. To improve the retention, for example, cationic polymers, nanoparticles or several polymers are added at the same time. The effect of these polymers is to retain colloidal particles on the fiber surfaces without causing them to accumulate between the fibers. Other important additives for the modification of the base paper are hydrophobic sizing agents, which are often added in the form of emulsions and / or dispersions and serve to attach to the fiber or filler surfaces and thus make them hydrophobic.
Im Falle von bedruckbaren Papieren ist es seit einer Vielzahl von Jahren bekannt, spezielle Oberflächenbehandlungen vorzunehmen, wie beispielsweise Salze zweiwertiger Metalle als Fällungsmittel, Farbstofffixiermittel bzw. Koagulationshilfsmittel für Farbstoffe (Tinte) dem Oberflächenbehandlungsmittel zuzusetzen, um die Eigenschaften des Papiers für eine Bedruckbarkeit zu verbessern.In the case of printable papers, it has been known for a number of years to perform special surface treatments such as salts of divalent metals as precipitating agents, dye fixing agents or coagulating aids for dyes (ink) to the surface treatment agent to improve the properties of the paper for printability.
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Die vorliegende Erfindung zielt nun darauf ab, ein Verfahren zur Herstellung von Papier bzw. ein Papier zur Verfügung zu stellen, welches einfach ausführbar ist und in welchem durch Einsatz weniger Bestandteile ein Papier hergestellt werden kann, auf welchem eine wenigstens gleichwertige Farbdichte wie mit Produkten gemäß dem Stand der Technik beim Bedrucken erreicht werden kann und gleichzeitig ein geringeres Ausbluten, Verwerfen des Papiers, Ausfransen sowie ein verbesserter Farb-in-Farb-Verlauf des Papiers nach dem Bedrucken sowie eine schnellere Trocknungszeit der Drucktinte auf dem Papier ermöglicht wird.The present invention now aims to provide a method for producing paper or a paper which is easy to carry out and in which by using less constituents a paper can be produced, on which an at least equivalent color density as with products according to The prior art can be achieved in printing and at the same time less bleeding, discarding of the paper, fraying and an improved color-in-color course of the paper after printing and a faster drying time of the printing ink is made possible on the paper.
Zur Lösung dieser Aufgabe ist das erfindungsgemäße Verfahren dadurch gekennzeichnet, dass aus einer Pulpe enthaltend als Hauptbestandteil Cellulose, zwischen 0 und 50 Gew.-%, insbesondere 10 und 30 Gew.-% CaC03 als Füllstoff sowie gegebenenfalls einen optischen Aufheller oder ein Retentionshilfsmittel, ein nicht geleimtes Basispapier gebildet wird und dass das Basispapier mit einem flüssigen Oberflächenbehandlungsmedium enthaltend zwischen 1 und 20 kg/t Papier MgSO4 beschichtet wird und dass das Papier gegebenenfalls einem Nachbehandlungsschritt sowie einem Trocknen unterworfen wird. Indem zuerst ein nicht geleimtes Basispapier hergestellt wird, und dieses nicht geleimte Basispapier mit einem flüssigen Oberflächenbehandlungsmedium enthaltend zwischen 1 und 20 kg/t Magnesiumsulfat sowie gegebenenfalls weiteren Zusatzstoffen beschichtet wird und das Papier gegebenenfalls einem Nachbehandlungsschritt unterworfen wird, gelingt es mit extrem wenigen Arbeitsschritten, ein Papier herzustellen, auf welches neben den das Basispapier ausbildenden Hauptbestandteilen Cellulose und Calciumcarbonat als Füllstoff zusätzlich lediglich Magnesiumsulfat als Oberflächenbehandlungsmedium aufgebracht werden muss. Magnesiumsulfat bildet hiebei während der Papierherstellung auf der Oberfläche des Papiers ein Monohydrat, da während der Trocknung an der Oberfläche höhere Temperaturen als 68 °C vorherrschen. Bei Raumtemperatur ist die stabile Form das Magnesiumsulfat.Heptahydrat, weshalb bei einem nachfolgenden Bedrucken des Papiers mit Tinten auf Wasserbasis pro Masseeinheit eingesetzten trockenen Magnesiumsulfates 0,90 Masseeinheiten Wasser aufgenommen werden können. Während eines nachfolgenden Bedruckens, insbesondere im Inkjetverfahren ist ein so hergestelltes Papier herkömmlichen Papieren deutlich in Bezug auf die Trocknungsgeschwindigkeit überlegen. Zusätzlich wird dieTo achieve this object, the inventive method is characterized in that from a pulp containing as the main component cellulose, between 0 and 50 wt .-%, in particular 10 and 30 wt .-% CaCO 3 as a filler and optionally an optical brightener or a retention aid, an unsized base paper is formed, and that the base paper is coated with a liquid surface treatment medium containing between 1 and 20 kg / t paper of MgSO4 and that the paper is optionally subjected to a post-treatment step and drying. By first a non-sized base paper is prepared, and this unsized base paper with a liquid surface treatment medium containing between 1 and 20 kg / t magnesium sulfate and optionally other additives is coated and the paper is optionally subjected to a post-treatment, succeeds in extremely few steps, a To produce paper on which in addition to the base paper forming main constituents cellulose and calcium carbonate as filler additionally only magnesium sulfate must be applied as a surface treatment medium. Magnesium sulphate forms a monohydrate on the surface of the paper during papermaking since higher temperatures than 68 ° C. prevail during drying on the surface. At room temperature, the stable form is the magnesium sulfate. Heptahydrat, which is why in a subsequent printing of the paper with water-based inks used per unit of dry dry magnesium sulfate 0.90 units of water can be added. During subsequent printing, in particular in the inkjet process, a paper produced in this way is superior to conventional papers in terms of the drying rate. In addition, the
Formstabilität des Papiers verbessert, da das vom Magnesiumsulfat absorbierte Wasser nicht zur Quellung der Fasern beitragen kann und somit das Aufwölben des Papiers an den bedruckten Stellen unterbunden wird. Zum Vergleich bildet beispielsweise das häufig in Oberflächenbehandlungsmitteln eingesetzte Calciumchlorid bei den Temperaturen der Papierherstellung ein Dihydrat, bei Raumtemperatur aber ein Hexahydrat. Somit kann eine Masseeinheit eingesetzten trockenen Calciumchlorides lediglich etwa 0,65 Masseeinheiten Wasser absorbieren, so dass das im Zusammenhang mit der vorliegenden Erfindung eingesetzte Magnesiumsulfat um 38 % effektiver beim Absorbieren von Wasser als das üblicherweise eingesetzte Calciumchlorid ist. Wenn in diesem Zusammenhang von einem bereits getrockneten Basispapier ausgegangen wird, gelingt es durch Aufbringen einer Magnesiumsulfatlösung auf der Papieroberfläche somit, während eines Bedruckens des gemäß der Erfindung hergestellten Papiers, die in der Tinte enthaltene Flüssigkeit durch das Oberflächenbehandlungsmedium Magnesiumsulfat rasch und zuverlässig aufzusaugen, so dass insbesondere die Punktgröße eines mit Magnesiumsulfat behandelten Papiers deutlich geringer als jene eines mit Calciumchlorid behandelten Papiers ist, wodurch es bei einer derartigen Verfahrensführung in überraschender Weise gelingt, durch Einsatz von extrem wenigen und gezielt ausgewählten Inhaltsstoffen ein Papier herzustellen, welches in der Qualität wenigstens einem herkömmlichen Papier, welches neben der Oberflächenbehandlung üblicherweise auch Leimungsmittel, Pigmente sowie weitere Zusatzstoffe enthält, entspricht.Form stability of the paper improved because the water absorbed by magnesium sulfate can not contribute to the swelling of the fibers and thus the bulging of the paper is prevented at the printed areas. For comparison, for example, the calcium chloride frequently used in surface treatment agents forms a dihydrate at the temperatures of papermaking, but at room temperature a hexahydrate. Thus, a dry calcium chloride used in a unit of mass can only absorb about 0.65 mass units of water, so that the magnesium sulfate used in the context of the present invention is 38% more effective in absorbing water than the commonly used calcium chloride. In this connection, when starting from an already dried base paper, by applying a magnesium sulfate solution to the paper surface, during printing of the paper produced according to the invention, the liquid contained in the ink can be rapidly and reliably absorbed by the surface treatment medium, magnesium sulfate In particular, the point size of a treated with magnesium sulfate paper is significantly lower than that of a treated with calcium chloride paper, whereby it succeeds in such a procedure surprisingly by using extremely few and selectively selected ingredients to produce a paper which in quality at least one conventional Paper, which in addition to the surface treatment usually also contains sizing agents, pigments and other additives corresponds.
Beim Bedrucken mit wasserbasierten Pigmenttinten bzw. Pigmenttinte auf Wasserbasis kann sich das wasserlösliche Magnesiumsulfat teilweise in der Tinte lösen, wodurch die Pigmentdispersion destabilisiert wird und es zur Koagulation der Farbpigmente kommt. Das koagulierte Farbpigment bleibt an der Oberfläche des Papiers und dringt nicht mit der Flüssigkeit in das Innere desselben ein, weshalb das mit Magnesiumsulfat gemäß der Erfindung behandelte Papier beim Bedrucken mit wasserbasierenden Pigmenttinten eine höhere Farbdichte aufweist, als ein unbehandeltes Papier.When printed with water-based pigment inks or water-based pigment ink, the water-soluble magnesium sulfate may partially dissolve in the ink, thereby destabilizing the pigment dispersion and coagulating the color pigments. The coagulated color pigment remains on the surface of the paper and does not penetrate with the liquid into the interior thereof, and therefore the paper treated with magnesium sulfate according to the invention has a higher color density when printed with water-based pigment inks than an untreated paper.
Ein weiterer Vorteil des erfindungsgemäßen Verfahrens ist der Ersatz des üblicherweise enthaltenen, hochkorrosivem Chlorids durch weniger korrosiv wirkendes Sulfat, so dass die Lebensdauer des Auftragsaggregates für die Oberflächenbehandlung verlängert wird sowie die Standzeiten der Verschleißteile im Auftragsaggregat, wie beispielsweise der Rakelstäbe, erhöht werden. Ebenso wird bei der Wiederverwertung von Ausschussware der Eintrag korrosiven Chlorids in den Wasserkreislauf der Papiermaschine reduziert. Indem, wie dies einer bevorzugten Weiterbildung des erfindungsgemäßen Verfahrens entspricht, das Papier als Nachbehandlungsschritt einem Kalandern oder Glätten unterworfen wird, gelingt es trotz des Fehlens von inneren Leimungsmitteln oder weiteren Zusatzstoffen, ein glattes Papier, welches keinerlei Verwerfungen aufweist, und welches in jedem modernen Drucker eingesetzt werden kann, zur Verfügung zu stellen. Es ist hiebei auch unerheblich, ob es sich um einen Tintenstrahldruck oder auch Laserdruck handelt.Another advantage of the method according to the invention is the replacement of the usually contained, highly corrosive chloride by less corrosive sulfate, so that the life of the application unit for the surface treatment is extended and the life of the wear parts in the application unit, such as the metering rods, increased. Likewise, in the recycling of rejects, the entry of corrosive chloride into the water cycle of the paper machine is reduced. In that, as this corresponds to a preferred development of the method according to the invention, the paper is subjected to calendering or smoothing as a post-treatment step, despite the absence of internal sizing agents or other additives, it is possible to produce a smooth paper which has no distortions and which in any modern printer can be used to provide. It is also irrelevant hiebei, whether it is an inkjet printing or laser printing.
Indem gemäß einer bevorzugten Weiterbildung des erfindungsgemäßen Verfahrens das Papier bis zu einer Glätte zwischen 60 und 150 Bekk s. geglättet bzw. kalandert wird, wird das Ausfransen der Tinte entlang der Fasern vermindert und ist vergleichbar einem Papier, das mit einer Hydrophobierung durch ein inneres und/oder ein Oberflächenleimungsmittel behandelt wurde. Somit ist das erfindungsgemäße Papier für den Einsatz im Tintenstrahldruck bzw. auch im Laserdruck ohne Ausbildung von Verwerfungen gut und vorteilhaft geeignet.By according to a preferred embodiment of the method according to the invention, the paper to a smoothness between 60 and 150 Bekk s. is calendered, the fraying of the ink along the fibers is reduced and is comparable to a paper which has been treated with a hydrophobing by an inner and / or a surface sizing agent. Thus, the paper according to the invention is well and advantageously suitable for use in inkjet printing or even in laser printing without the formation of distortions.
Für eine besonders einfache Verfahrensführung wird das erfindungsgemäße Verfahren so geführt, dass die MgS04 Lösung als 0,5 bis 20 gew.-%ige, insbesondere 1 bis 5 gew.-%ige wässrige Lösung eingesetzt wird. Durch Zusatz von Magnesiumsulfat als 0,5 bis 20 gew.-%ige Lösung gelingt eine besonders homogene Verteilung des Fixiermittels in dem Oberflächenbehandlungsmedium und somit nachfolgend auf der Oberfläche des damit behandelten Papiers, so dass gleichbleibende Eigenschaften über die gesamte Oberfläche des mit dem Verfahren gemäß der Erfindung hergestellten Papiers sichergestellt werden können.For a particularly simple procedure, the process according to the invention is carried out such that the
Indem das erfindungsgemäße Verfahren bevorzugt so geführt wird, dass das Basispapier mit MgSO4 sowie einem Polydiallyldimethylammoniumchlorid-Polymer beschichtet wird, gelingt es insbesondere, eine verbesserte Fixierung von Farbstofftinten an der Oberfläche des Papiers zu erzielen, bei gleichzeitig schnellem Trocknen der auf der Oberfläche eines so hergestellten Papiers aufgebrachten, flüssigen Farbstoffzusammensetzung, so dass ein Verlaufen der Farben mit Sicherheit ausgeschlossen wird und gleichzeitig eine gute Anhaftung derselben an der Oberfläche erzielt wird.By carrying out the process according to the invention in such a way that the base paper is coated with MgSO4 and a polydiallyldimethylammonium chloride polymer, it is possible in particular to achieve an improved fixation of dye inks on the surface of the paper, while at the same time rapidly drying the surface of a paper thus prepared Paper applied, liquid dye composition, so that a bleeding of the colors is excluded with certainty and at the same time a good adhesion of the same is achieved at the surface.
Eine besonders gute Fixierung der Papieroberfläche wird dadurch erzielt, dass das Polydiallyldimethylammoniumchlorid-Polymer in einer Menge von 1 bis 12 kg/t Papier in dem Oberflächenbehandlungsmedium eingesetzt wird. Bei einer derartigen Verfahrensführung gelingt es, gleichzeitig eine schnelle Trocknung der auf das so hergestellte Papier aufgebrachten Tinte zu erzielen und ein Verlaufen derselben bei geringen eingesetzten Mengen des Oberflächenbehandlungsmediums während des Herstellungsverfahrens zu vermeiden.A particularly good fixation of the paper surface is achieved by using the polydiallyldimethylammonium chloride polymer in an amount of 1 to 12 kg / t of paper in the surface treatment medium. In such a process management, it is possible at the same time to achieve rapid drying of the ink applied to the paper thus produced and to avoid bleeding of the same with small amounts of the surface treatment medium used during the production process.
Insbesondere günstige Eigenschaften eines gemäß dem Verfahren der vorliegenden Erfindung hergestellten Papiers können dadurch erzielt werden, dass als flüssiges Oberflächenbehandlungsmedium 1 bis 20 kg/t Papier, insbesondere 6 bis 10 kg/t Papier MgS04 und 1 bis 12 kg/t Papier, insbesondere 4 kg/t Papier Polydiallyldimethylammoniumchlorid-Polymer eingesetzt wird.In particular, favorable properties of a paper produced according to the method of the present invention can be achieved by using as a liquid
Mit einer derartigen Abstimmung der Einsatzmengen von Magnesiumsulfat als Absorptionsmittel sowie als Fixiermittel bzw. Fällungsmittel für Pigmenttinten und dem speziellen Polydiallyldimethylammoniumchlorid-Polymer als Fixiermittel für Farbstofftinten gelingt es in extrem wenigen Verfahrensschritten und gleichzeitig unter Einsatz weniger Zusatzstoffe, ein Papier herzustellen, welches vergleichbare Eigenschaften zu einem herkömmlichen Papier mit sowohl innerer als auch Oberflächenleimung besitzt, jedoch ökonomisch bedeutend günstiger hergestellt werden kann.With such a vote of the amounts of magnesium sulfate as an absorbent and as a fixing agent or precipitant for pigment inks and the special Polydiallyldimethylammoniumchlorid polymer as a dyeing ink fixing succeeds in extremely few steps and at the same time using less additives to produce a paper that comparable properties to a has conventional paper with both internal and surface sizing, but can be economically produced significantly cheaper.
Indem, wie dies einer bevorzugten Weiterbildung des Verfahrens gemäß der vorliegenden Erfindung entspricht, das Verfahren so geführt wird, dass zusätzlich ein Bindemittel, wie eine native oder modifizierte Stärke, ein Polyvinylalkohol oder Mischungen davon eingesetzt wird, gelingt es, eine durchgehende Schicht auf der Oberfläche des Papiers auszubilden, welche sich durch eine extrem hohe Gleichmäßigkeit auszeichnet, so dass nicht nur die Farbstoffbindungseigenschaften sondern auch insbesondere die Gleichmäßigkeit der Bedruckbarkeit des Papiers durch eine derartige Verfahrensführung deutlich verbessert wird.By carrying out the process in such a way that, in addition, a binder, such as a native or modified starch, a polyvinyl alcohol or mixtures thereof, is used, it is possible to produce a continuous layer on the surface form of the paper, which is characterized by an extremely high uniformity, so that not only the dye-binding properties but also in particular the uniformity of the printability of the paper is significantly improved by such a procedure.
Um ein Papier mit besonders hoher Weiße zur Verfügung stellen zu können, wird das erfindungsgemäße Verfahren so geführt, dass ein disulphonierter, tetrasulphonierter, hexasulfonierter optischer Aufheller oder ein Distyrylbiphenyl Aufheller eingesetzt wird. Überraschenderweise wird die Effektivität eines di-, tetra- oder hexasulfonierten, optischen Aufhellers oder eines Distyrylbiphenyl-Aufhellers durch Verwendung von Magnesiumsulfat in bedeutend geringerem Maß herabgesetzt als durch beispielsweise Calciumchlorid, so dass mit einer derartigen Verfahrensführung eine bedeutend bessere Weiße des Papiers im Vergleich zu Papieren, welchen beispielsweise Salze anderer zweiwertiger Metallionen zugesetzt wurden, erzielt werden kann.In order to be able to provide a paper of particularly high whiteness, the process according to the invention is conducted in such a way that a disulphonated, tetrasulphonated, hexasulphonated optical brightener or a distyrylbiphenyl brightener is used. Surprisingly, the effectiveness of a di-, tetra- or hexasulfonated optical brightener or distyrylbiphenyl brightener by using Magnesium sulfate is reduced to a significantly lesser extent than, for example, calcium chloride, so that with such process control a significantly better whiteness of the paper can be achieved compared to papers to which, for example, salts of other divalent metal ions have been added.
Dieser Effekt kann gemäß der vorliegenden Erfindung dadurch noch weiter verbessert werden, dass, wie dies einer bevorzugten Weiterbildung des erfindungsgemäßen Verfahrens entspricht, der optische Aufheller sowohl in dem Basispapier als auch dem Oberflächenbehandlungsmedium eingesetzt wird.This effect can be further improved according to the present invention in that, as corresponds to a preferred development of the method according to the invention, the optical brightener is used both in the base paper and the surface treatment medium.
Im Zusammenhang mit der vorliegenden Erfindung hat es sich überraschend gezeigt, dass bei einem nachfolgenden Bedrucken eines erfindungsgemäß hergestellten Papiers eine gleichmäßig hohe Farbdichte dadurch erzielt werden kann, dass im Oberflächenbehandlungsmedium zusätzlich ein Pigment gewählt aus der Gruppe gemahlenes, gefälltes oder modifiziertes CaC03 oder Mischungen davon eingesetzt wird. Die Oberflächenbehandlung mit einem Pigment alleine erhöht die Farbdichte im Inkjetdruck gegenüber einem unbehandelten Papier, die erfindungsgemäße zusätzliche Verwendung von MgSO4 führt zu einer darüber hinaus gehenden Verbesserung der Farbdichte, so dass der Einsatz dieser erfindungsgemäßen Kombination sowohl bei Papieren, welche ein Pigment enthalten, als auch Papieren, welche kein Pigment enthalten, zu überraschend vorteilhaften und unerwarteten Ergebnissen führt.In connection with the present invention, it has surprisingly been found that in a subsequent printing of a paper according to the invention a uniformly high color density can be achieved by additionally using in the surface treatment medium a pigment selected from the group milled, precipitated or modified CaCO 3 or mixtures thereof becomes. The surface treatment with a pigment alone increases the ink density in inkjet over an untreated paper, the additional use of MgSO4 according to the invention leads to a further improvement in the color density, so that the use of this combination according to the invention both in papers containing a pigment as well Papers that contain no pigment leads to surprisingly beneficial and unexpected results.
Das erfindungsgemäße Verfahren kann somit sowohl für die Herstellung von pigmentiertem als auch für die Herstellung von nicht pigmentiertem Papier mit gleichmäßigem Erfolg eingesetzt werden.The process according to the invention can thus be used with equal success both for the production of pigmented and for the production of non-pigmented paper.
Für eine besonders gleichmäßige Verfahrensführung und insbesondere für gleichmäßige Ergebnisse des erfindungsgemäßen Verfahrens wird das Verfahren bevorzugt so geführt, dass dem Oberflächenbehandlungsmedium zusätzlich ein Viskositätsregler, wie ein Polyacrylat zugesetzt wird. Mit einer derartigen Verfahrensführung gelingt es, eine gleichmäßige, insbesondere gleichmäßig dicke Oberflächenbehandlungsschicht auf dem Papier zu erzielen.For a particularly uniform process control and in particular for uniform results of the process according to the invention, the process is preferably carried out so that the surface treatment medium additionally a viscosity regulator, such as a polyacrylate is added. With such a process management, it is possible to achieve a uniform, in particular uniformly thick surface treatment layer on the paper.
Um beim Bedrucken mit wasserbasierenden Tinten unerwünschte Effekte, wie das Quellen des Bindemittels mit damit einhergehendem Festigkeitsverlust hintanzuhalten, wird das erfindungsgemäße Verfahren bevorzugt so geführt, dass dem Bindemittel, insbesondere der Stärke ein Quervernetzungsmittel, wie beispielsweise ein Zirkoniumsalz zugesetzt wird.In order to avoid undesirable effects when printing with water-based inks, such as swelling of the binder with concomitant loss of strength, the process according to the invention is preferably carried out in such a way that the binder, especially the starch is a crosslinking agent, such as a zirconium salt is added.
Zur Erhöhung der Glätte eines mit dem Verfahren gemäß der vorliegenden Erfindung hergestellten Papiers wird das erfindungsgemäße Verfahren bevorzugt so geführt, dass dem Oberflächenbehandlungsmedium ein Gleitmedium zugesetzt wird. Hierbei hat sich Calciumstearat als vorteilhaft erwiesen, welches sowohl eine erhöhte Glätte als auch eine gute Bedruckbarkeit des Papiers ergibt.To increase the smoothness of a paper produced by the process according to the present invention, the process according to the invention is preferably conducted in such a way that a lubricating medium is added to the surface treatment medium. Here, calcium stearate has proven to be advantageous, which results in both an increased smoothness and a good printability of the paper.
In einer bevorzugten Weiterbildung der Erfindung und um insbesondere eine gleichmäßig und gut bedruckbare Oberflächenschicht des insbesondere pigmentierten Papiers zu erzielen, wird das erfindungsgemäße Verfahren so geführt, dass der Gesamtfeststoffgehalt des Oberflächenbehandlungsmediums zwischen 15 bis 70 Gew.-%, insbesondere 30 bis 50 Gew.-% gewählt wird. Indem der Gesamtfeststoffgehalt des Oberflächenbehandlungsmediums zwischen 15 bis 70 Gew.%, insbesondere zwischen 30 und 50 Gew.-% gewählt wird, kann ein gleichmäßiger Strich des Basispapiers erzielt werden und zusätzlich die Dicke der Oberflächenschicht, welche durch Aufbringen des Oberflächenbehandlungsmediums auf das Basispapier erzielt werden kann, beliebig und insbesondere auf ein Minimalerfordernis eingestellt werden.In a preferred embodiment of the invention and in particular to achieve a uniform and well printable surface layer of the particular pigmented paper, the inventive method is performed so that the total solids content of the surface treatment medium between 15 to 70 wt .-%, in particular 30 to 50 wt. % is selected. By choosing the total solids content of the surface treatment medium to be between 15 to 70% by weight, especially between 30 and 50% by weight, a uniform stroke of the base paper can be achieved, and additionally the thickness of the surface layer obtained by applying the surface treatment medium to the base paper can be set arbitrarily and in particular to a minimum requirement.
Mit einer derartigen Verfahrensführung gelingt es daher gemäß einer bevorzugten Weiterbildung des Verfahrens der vorliegenden Erfindung, ein insbesondere pigmentiertes Papier zu erzielen, welche dadurch gekennzeichnet ist, dass ein Gewicht einer trockenen Oberflächenbeschichtung 1 bis 10 (g/m2 Seite), insbesondere etwa 4 (g/m2 Seite) aufweist, erzielt wird. Ein derartiges Gewicht einer trockenen Oberflächenbeschichtung entspricht dem Gewicht, welches herkömmlich auf Druckereipapieren aufgebracht wird und kann gemäß der vorliegenden Erfindung mit einer extrem einfachen Verfahrensführung, in welcher lediglich Magnesiumsulfat in dem Oberflächenbehandlungsmedium zwingend enthalten sein muss, erzielt werden.With such a procedure, it is therefore possible according to a preferred development of the method of the present invention, to achieve a particular pigmented paper, which is characterized in that a weight of a
Die vorliegende Erfindung bezieht sich insbesondere weiters auf ein gemäß dem Verfahren der vorliegenden Erfindung hergestelltes Papier, welches vorzugsweise für den Tintenstrahldruck einsetzbar ist. Gemäß einer Weiterbildung ist ein derartiges Papier vorzugsweise im Wesentlichen dadurch gekennzeichnet, dass ein Kontaktwinkel von Wasser, insbesondere destilliertem Wasser mit dem Papier zwischen 15° und 70°, insbesondere zwischen 25° und 50° beträgt. Überraschenderweise hat es sich gezeigt, dass das mit dem Verfahren gemäß der vorliegenden Erfindung hergestellte Papier über einen extrem weiten Bereich von Kontaktwinkeln von Wasser mit Papier einsetzbar ist und es trotz dieser großen Bandbreite von verwendbaren Kontaktwinkeln möglich ist, ein Auslaufen der Farbe bzw. ein Verbleichen der Farbe mit Sicherheit hintanzuhalten, was vor allem auf den überaus guten Trockeneffekt des eingesetzten MgS04 zurückzuführen ist.In particular, the present invention relates to a paper produced according to the method of the present invention, which is preferably usable for ink-jet printing. According to one embodiment, such a paper is preferably essentially characterized in that a contact angle of water, in particular distilled water with the paper is between 15 ° and 70 °, in particular between 25 ° and 50 °. Surprisingly, it has been shown that the paper produced by the method according to the present invention can be used over an extremely wide range of contact angles of water with paper and, despite this wide range of usable contact angles, it is certainly possible to reliably prevent the color from fading or color fading, This is mainly due to the very good drying effect of the MgS04 used.
Die Erfindung wird nachfolgend anhand von Ausführungsbeispielen näher erläutert, in welchen das mit dem Verfahren der vorliegenden Erfindung hergestellte Papier mit herkömmlichen Papieren verglichen wird.The invention will be explained in more detail below by means of embodiments in which the paper produced by the method of the present invention is compared with conventional papers.
Auf ein Testpapier sowie ein Vergleichspapier aus einem ungeleimten Rohpapier mit 100 g/m2 Flächengewicht wurden mit einer Rakel wässrige Lösungen von poly-DADMAC (Polydiallyldimethylammoniumchlorid) sowie im Falle eines Testpapiers gemäß der Erfindung Magnesiumsulfat und im Falle eines Vergleichspapiers Calciumchlorid aufgetragen. Die Konzentrationen wurden dabei so gewählt, dass bei einem beidseitigen Nassauftrag von je 12 (g/m2 Seite) der Gehalt an polyDADMAC 4,7 kg/t, an CaCl2 bzw. MgSO4 3 bis 10 kg/t beschichtetem Papier betrüge. Tatsächlich wurde jedoch nur eine Seite mit 12 g/m2 Nassauftrag der entsprechenden Lösung beschichtet und getrocknet. Anschließend wurde die beschichtete Seite mit einem HP Photosmart B9180 Drucker mit den Einstellungen "Standard / Normalpapier" unter Verwendung von Pigmenttinten bedruckt. Mit einem X-Rite DensiEye 700 Farbdensitometer wurden die Farbdichten von Volltonflächen von Cyan (C), Magenta (M), Gelb (Y) und Schwarz (K) sowie den binären Mischfarben Rot (100 M + 100 Y), Grün (100 C + 100 Y) und Blau (100 C + 100 M) gemessen. In
Bei der in
Auf einer Papiermaschine wurde ein ungeleimtes Papier mit 90 g/m2 Flächengewicht aus einer Zellstoffsuspension, enthaltend als Füllstoff 15 Gew.-% präzipitiertes Calciumcarbonat (PCC) bezogen auf den Trockengehalt der Suspension, gebildet und in einer Filmpresse ein Oberflächenbehandlungsmedium, bestehend aus einer wässrigen Lösung von 2,0 Gew.-% Magnesiumsulfat und 1,0 Gew.-% poly-DADMAC, beidseitig so aufgebracht, dass der Gehalt an Magnesiumsulfat im fertigen Papier 7 kg/t betrug. Das Papier wurde auf eine Glätte von 105 Bekk s geglättet.On a paper machine, an unprimed 90g /
Auf einer Papiermaschine wurde ein geleimtes Papier mit 90 g/m2 Flächengewicht aus einer Zellstoffsuspension enthaltend als Füllstoff 18 Gew.-% präzipitiertes Calciumcarbonat (PCC) bezogen auf den Trockengehalt der Suspension, gebildet. Als Leimungsmittel wurde Alkenylbernsteinsäureanhydrid (ASA) verwendet, und die Leimungsmenge wurde so eingestellt, dass der 60 s Cobb Wert des fertigen Papiers 30 g/m2 betrug. In einer Filmpresse wurde ein Oberflächenflächenbehandlungsmedium, bestehend aus einer wässrigen Lösung von 10 Gew.-% enzymatisch abgebauter Maisstärke und 1,8 Gew.-% CaCl2 so aufgebracht, dass der Gehalt an CaCl2 in dem fertigen Papier 6 kg/t betrug. Die Rauhigkeit wurde auf einen für Naturpapiere üblichen Wert von 200 ml/min nach Bendtsen engestellt.On a paper machine, a sized paper of 90 g /
Die Papiere aus Ausführungsbeispiel 2 und Referenzbeispiel 1 wurden mit verschiedenen Druckern bedruckt und die Farbdichten, wie oben angegeben gemessen. Zusätzlich wurde die Farbdichte des schwarzen Feldes auf der Rückseite des Papiers als Maß für das Durchschlagen der Tinte gemessen. Als Drucker wurden ein HP Photosmart B9180 mit den Standard Pigmenttinten und den Druckeinstellungen "Standard / Normalpapier", ein Canon MP610 mit Standard Farbstofftinten und den Druckeinstellungen "Hoch / Foto Glanzpapier", ein Epson Stylus S21 gefüllt mit Kodak Versamark Farbstofftinten der FV2000 Serie und den Druckeinstellungen "Entwurf / Epson glossy" und ein Epson Stylus SX218 gefüllt mit Océ Jetstream 1000 Farbstofftinten und den Druckeinstellungen "Foto, Epson Photo" verwendet. Die letzten beiden Drucker wurden mit Tinten von Hochgeschwindigkeitsproduktionsinkjetdruckmaschinen befüllt, um die Leistung des Papiers auf diesen Druckmaschinen zu simulieren.The papers of
Die Ergebnisse der Farbdichtemessungen sind in Tabelle 1 angeführt. Aus den Ergebnissen ist klar ersichtlich, dass die Farbdichte, welche mit dem ungeleimten Papier gemäß der Erfindung erzielt werden kann, überlegen oder zumindest gleich jener eines herkömmlichen, geleimten und mit CaCl2 behandelten Papiers gemäß Referenzbeispiel 1 ist. Überraschenderweise wurde bei einem Drucker festgestellt, dass die Tinte punktuell vollständig durch das Papier des Referenzbeispiels 1 durchschlug, beim ungeleimten Papier gemäß Ausführungsbeispiel 2 auf Grund der guten Absorptionseigenschaften jedoch kein punktuelles Durchschlagen festzustellen war.
Mit einem PocketGoniometer PGX von Fibro System wurde der Kontaktwinkel auf den Papieren des Ausführungsbeispiels 2 sowie des Referenzbeispiels 1 gemessen. Das Gerät erlaubt auch die Berechnung des Tropfenvolumens, wodurch eine gute Indikation der Absorptionsgeschwindigkeit zu erhalten ist.
Claims (16)
- A method for surface-treating paper, in particular paper printable by inkjet printing, in which an aqueous solution containing at least one water-soluble salt of a bivalent metal and optionally one or several substances selected from a binder, a pigment, a surface sizing agent and/or a cationic polymer is applied to a base paper containing cellulose fibers and optionally fillers, an optical brightener, retention aids or dyes or pigments, characterized in that an unsized base paper is formed from a pulp comprising cellulose as a main component, between 0 and 50% by weight, in particular 10 and 30% by weight, of CaCO3 as a filler, and optionally an optical brightener or a retention aid, and that the base paper is coated with a liquid surface treatment medium comprising between 1 and 20 kg/t paper of MgSO4 and optionally a cationic polymer, and that the paper is optionally subjected to a post-treatment step.
- A method according to claim 1, characterized in that the paper is subjected to calendaring or smoothing as said post-treatment step.
- A method according to claim 2, characterized in that the paper is smoothed or calendered to a smoothness between 60 and 150 Bekk (s).
- A method according to claim 1, 2 or 3, characterized in that the MgSO4 solution is used as a 0.5 to 20% by weight, in particular 1 to 5% by weight, aqueous solution.
- A method according to any one of claims 1 to 4, characterized in that the base paper is coated with MgSO4 as well as a polydiallyldimethylammonium chloride.
- A method according to any one of claims 1 to 5, characterized in that the polydiallyldimethylammonium chloride polymer is used in the surface treatment medium at an amount of 1 to 12 kg/t paper.
- A method according to any one of claims 1 to 6, characterized in that 1 to 20 kg/t paper, in particular 6 to 10 kg/t paper, of MgSO4 and 1 to 12 kg/t paper, in particular 4 kg/t paper, of polydiallyldimethylammonium chloride polymer is used as said liquid surface treatment medium.
- A method according to any one of claims 1 to 7, characterized in that a binder such as a native or modified starch, a polyvinyl alcohol, a carboxymethylcellulose, polyvinylpyrrolidone or mixtures thereof is additionally used.
- A method according to claim 8, characterized in that a cross-linking agent such as a zirconium salt is added to the binder.
- A method according to any one of claims 1 to 9, characterized in that a disulfonated, tetrasulfonated, hexasulfonated optical brightener or a distyrylbiphenyl brightener is used.
- A method according to claim 10, characterized in that the optical brightener is used both in the base paper and in the surface treatment medium.
- A method according to any one of claims 1 to 11, characterized in that a pigment selected from the group consisting of ground, precipitated or modified CaCO3, silica gel, Al2O3, kaolin, titanium dioxide or mixtures thereof is additionally used.
- A method according to any one of claims 1 to 12, characterized in that the total solids content of the surface treatment medium is selected between 15 and 70% by weight, in particular 30 and 50% by weight.
- A method according to claim 12 or 13, characterized in that a weight of a dry surface coating comprising 1 to 10 (g/m2 side), in particular about 4 (g/m2 side), is selected.
- A method according to any one of claims 1 to 13, characterized in that a viscosity regulator such as a polyacrylate is additionally added to the surface treatment medium.
- A method according to any one of claims 1 to 15, characterized in that a lubricant, in particular calcium stearate, is added to the surface treatment medium.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ATA914/2011A AT511619B1 (en) | 2011-06-22 | 2011-06-22 | METHOD FOR SURFACE TREATMENT OF PAPER AND PAPER |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2537981A1 EP2537981A1 (en) | 2012-12-26 |
EP2537981B1 true EP2537981B1 (en) | 2014-06-11 |
Family
ID=46464966
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12004649.5A Active EP2537981B1 (en) | 2011-06-22 | 2012-06-21 | Method for treating the surface of paper and paper |
Country Status (4)
Country | Link |
---|---|
US (1) | US20120328802A1 (en) |
EP (1) | EP2537981B1 (en) |
AT (1) | AT511619B1 (en) |
AU (1) | AU2012203595B2 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU2011343730B2 (en) | 2010-12-15 | 2015-05-28 | Newpage Corporation | Recording medium for inkjet printing |
EP2770105A1 (en) | 2013-02-20 | 2014-08-27 | Schoeller Technocell GmbH & Co. KG | Substrate paper for decorative coating materials |
EP3237220B1 (en) | 2014-12-24 | 2021-09-08 | Hewlett-Packard Development Company, L.P. | Coated print medium |
WO2016105417A1 (en) | 2014-12-24 | 2016-06-30 | Hewlett-Packard Development Company, L.P. | Coated print medium |
CN107107645A (en) | 2014-12-24 | 2017-08-29 | 惠普发展公司,有限责任合伙企业 | Coating and printing medium |
US10550519B2 (en) | 2015-10-02 | 2020-02-04 | Hewlett-Packard Development Company, L.P. | Sizing compositions |
EP3192837B1 (en) * | 2016-01-14 | 2020-03-04 | Omya International AG | Wet surface treatment of surface-modified calcium carbonate |
DE102017215373A1 (en) * | 2017-09-01 | 2019-03-07 | Koenig & Bauer Ag | Mixture for a pre-coating of decorative papers and method for the production of printed decorative paper in a printing press |
CN109505192A (en) * | 2018-10-19 | 2019-03-22 | 金东纸业(江苏)股份有限公司 | A kind of inkjet printing paper and its coating used |
CN109763377A (en) * | 2019-03-04 | 2019-05-17 | 中国制浆造纸研究院有限公司 | A kind of production method of inkjet printing decoration paper and coating |
Family Cites Families (22)
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JPS6067190A (en) * | 1983-09-22 | 1985-04-17 | Ricoh Co Ltd | Ink jet recording medium |
JPH0812482B2 (en) * | 1990-08-03 | 1996-02-07 | 株式会社巴川製紙所 | Toner for electrostatic image |
US5676747A (en) * | 1995-12-29 | 1997-10-14 | Columbia River Carbonates | Calcium carbonate pigments for coating paper and paper board |
GB2301845B (en) * | 1995-06-06 | 1998-08-19 | Rexam Coated Products Limited | Natural tracing paper for use with pigment-based inks |
JP3133238B2 (en) * | 1995-10-26 | 2001-02-05 | 日本製紙株式会社 | Cast coated paper for inkjet recording and method for producing the same |
JPH09290556A (en) * | 1996-04-26 | 1997-11-11 | Mitsubishi Paper Mills Ltd | Ink jet recording sheet |
MY125712A (en) | 1997-07-31 | 2006-08-30 | Hercules Inc | Composition and method for improved ink jet printing performance |
JPH11321090A (en) * | 1998-03-17 | 1999-11-24 | Tomoegawa Paper Co Ltd | Ink jet recording sheet |
GB2346157A (en) * | 1999-01-28 | 2000-08-02 | Rexam Coated Products Limited | Surface-treated paper for use as recording medium |
JP3461754B2 (en) * | 1999-04-28 | 2003-10-27 | セイコーエプソン株式会社 | Ink jet recording medium and recording method |
US7216969B2 (en) * | 2003-01-28 | 2007-05-15 | Canon Finetech Inc. | Image recording method |
EP1522629A1 (en) * | 2003-10-08 | 2005-04-13 | M-real Oyj | Coated paper for printing |
US20050221024A1 (en) * | 2004-02-23 | 2005-10-06 | Rie Teshima | Ink jet recording sheet |
JP4098267B2 (en) * | 2004-03-26 | 2008-06-11 | 三菱製紙株式会社 | Inkjet recording sheet |
ATE393030T1 (en) * | 2005-06-29 | 2008-05-15 | Mitsubishi Hitec Paper Flensbu | INKJET RECORDING MATERIAL |
US8758886B2 (en) | 2005-10-14 | 2014-06-24 | International Paper Company | Recording sheet with improved image dry time |
WO2008144074A1 (en) * | 2007-05-21 | 2008-11-27 | International Paper Company | Recording sheet with improved image waterfastness, surface strength, and runnability |
US8012551B2 (en) * | 2008-05-29 | 2011-09-06 | International Paper Company | Fast dry coated inkjet paper |
PL2288752T3 (en) * | 2008-06-20 | 2014-07-31 | Int Paper Co | Composition and recording sheet with improved optical properties |
US20100129553A1 (en) * | 2008-11-27 | 2010-05-27 | International Paper Company | Optical Brightening Compositions For High Quality Inkjet Printing |
KR101666005B1 (en) * | 2009-08-12 | 2016-10-13 | 뉴페이지 코포레이션 | Inkjet recording medium |
WO2011026070A1 (en) * | 2009-08-31 | 2011-03-03 | Newpage Corporation | Inkjet recording medium |
-
2011
- 2011-06-22 AT ATA914/2011A patent/AT511619B1/en active
-
2012
- 2012-06-20 AU AU2012203595A patent/AU2012203595B2/en active Active
- 2012-06-21 EP EP12004649.5A patent/EP2537981B1/en active Active
- 2012-06-22 US US13/530,511 patent/US20120328802A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
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AT511619A1 (en) | 2013-01-15 |
AU2012203595B2 (en) | 2014-12-11 |
AU2012203595A1 (en) | 2013-01-17 |
EP2537981A1 (en) | 2012-12-26 |
AT511619B1 (en) | 2016-02-15 |
US20120328802A1 (en) | 2012-12-27 |
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