EP1216325A1 - Transparent paper and method for the production thereof - Google Patents

Transparent paper and method for the production thereof

Info

Publication number
EP1216325A1
EP1216325A1 EP00958252A EP00958252A EP1216325A1 EP 1216325 A1 EP1216325 A1 EP 1216325A1 EP 00958252 A EP00958252 A EP 00958252A EP 00958252 A EP00958252 A EP 00958252A EP 1216325 A1 EP1216325 A1 EP 1216325A1
Authority
EP
European Patent Office
Prior art keywords
transparent
layer
paper according
transparent paper
fibers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP00958252A
Other languages
German (de)
French (fr)
Other versions
EP1216325B1 (en
Inventor
Detlef Rhodius
Jürgen Graumann
Dirk Hinzmann
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.)
Heinrich August Schoeller Sohne & Co Kg GmbH
Original Assignee
Heinrich August Schoeller Sohne & Co Kg GmbH
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Filing date
Publication date
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Priority claimed from DE19942989A external-priority patent/DE19942989A1/en
Application filed by Heinrich August Schoeller Sohne & Co Kg GmbH filed Critical Heinrich August Schoeller Sohne & Co Kg GmbH
Publication of EP1216325A1 publication Critical patent/EP1216325A1/en
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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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/06—Vegetable or imitation parchment; Glassine paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/502—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording characterised by structural details, e.g. multilayer materials
    • B41M5/506—Intermediate layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5218—Macromolecular coatings characterised by inorganic additives, e.g. pigments, clays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5254—Macromolecular coatings characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
    • 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
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
    • D21H11/18—Highly hydrated, swollen or fibrillatable fibres
    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/28—Colorants ; Pigments or opacifying agents
    • D21H21/285—Colorants ; Pigments or opacifying agents insoluble
    • 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • D21H27/38—Multi-ply at least one of the sheets having a fibrous composition differing from that of other sheets

Definitions

  • the invention relates to a transparent paper and a method for producing a transparent paper.
  • backlit foils plastic foils, usually referred to as "backlight foils" since all known transparent papers have a basic structure which has different phases, which mixes with the actual color or graphic representation when shining through and in this way prevents a brilliant and sharply contoured reproduction of the representation on the transparent paper.
  • the object of the invention is to provide a transparency which is suitable as a backlit medium. Furthermore, the invention is based on the object of specifying a method for producing such a transparent paper.
  • the object is achieved by means of a transparent paper which comprises at least one transparent layer of densely packed, highly ground fibers which contain transparency-reducing fillers.
  • the invention is based on the surprising finding that fillers can be added to the transparent layer without significantly impairing the transparency, the term "transparent” being used here in the sense of "translucent” (not necessarily transparent).
  • transparent being used here in the sense of "translucent” (not necessarily transparent).
  • the use of the fillers makes it possible, for the first time, to conceal the irregularities that would otherwise normally be seen in transparent papers, since the fillers diffusely reflect the light passing through, which leads to a desired reduction in transparency and, in particular, to a homogeneous frosted glass-like view.
  • the fibers of the transparent layer contain sulfate pulp fibers, in particular long-fiber sulfate pulp fibers and fillers with a total weight of 1 to 6% of the total weight of the fibers contained in the transparent layer.
  • Silicates in particular silicates from the group of precipitated calcium, aluminum, calcium aluminum and sodium aluminum silicates, and a lead silicate have proven particularly useful as fillers.
  • the use of these fillers results in two phases in the paper, with the light refraction at the interfaces of the phases and a diffuse scattering of the transmitted light due to the Sihcat structure and the size of the fillers, so that the transparent paper is evenly illuminated when illuminated from behind " milky "appears.
  • the fillers act like water-insoluble, compared to the other ingredients of
  • the transparent layer is chemically neutral, that is, it does not enter into bonds with the smallest particle size and is usually white.
  • colored pigments can also be used to achieve special effects. It has proven particularly expedient if the grain size of the pigments is between 0.5 and 2.0 ⁇ m.
  • the refractive index of the pigments is approximately in the order of magnitude of the refractive index of the fibers of the transparent layer, i.e. usually between 1.5 and 1.6
  • cellulose has a refractive index of 1.53 and the pigments from the aforementioned materials have a refractive index of 1.56 to 1 , 57, and the silicate concentration based on the cellulose pulp is about 2 to 5%, so you get a transparent paper with a transparency of 30 to 40%, which is ideal for use in light boxes and the like.
  • the paper weight of the transparent layer should be in the range of 100 to 250 g / nr, preferably between approximately 150 and 200 g / m 2 that the paper is sturdy enough on the one hand, but on the other hand also elastic enough to be processed, for example, using a standard ink-steel printer and plotter. Because of the dense phaser packing, an ink receiving layer can be provided on the transparency layer, which is carried by the transparency layer. In this way, bleeding of applied liquid ink, in particular when printing by means of inkjet printers, can be reduced or avoided entirely. In addition, a strong wave formation of the transparency layer can be avoided when absorbing moisture. In this way, a printed image with sharp contours can be provided since the colors then run less, whereby the term "color" is also understood to mean black here.
  • the term “ink” or “ink-receiving layer” is to be understood in its most general form and includes any layer which is suitable for appropriately absorbing a color, pigments or inks or the like and for reducing the disadvantageous properties of the transparency layer.
  • the ink-receiving layer can be designed to receive inks from ink-jet printers. But it can also be designed for screen printing or airbrushing processes.
  • a mixture of partially saponified polyvinyl alcohol and / or polyvinylpyrrohdon, in particular in a ratio of 9: 1, has proven particularly useful as an ink receiving layer, which could also be called a color receiving layer.
  • a borax-containing binder has proven to be useful. The fixation of the ink-receiving layer on the transparent layer is then based on a complex formation between the polyvinyl alcohol and the borax, a polyvinyl alcohol-boric acid-monodiol complex being formed in the acidic pH range.
  • such an ink receiving layer is also suitable for printing on paper layers with extremely high fiber packs, regardless of the other properties of the transparency layer or the transparent paper.
  • such a layer can also be used advantageously with conventional transparent papers.
  • the transparent paper can be produced, for example, by first producing a paper layer with densely packed fibers from a highly ground pulp with the addition of water-insoluble pigments with a proportion of between 2 and 5 percent by weight, based on the pulp, with the densely packed fibers. Then an ink-receiving fluid is made from partially saponified polyvinyl alcohol and polyvinylpyrrohdon mixed, which is finally applied to the transparent layer with the addition of a borax-containing binder.
  • the polymer solution acting as an ink-receiving layer can be applied to the transparent paper using conventional coating methods such as, for example, doctor blades, blades and other common coating methods. Depending on the type of coating technology and machine used, coating speeds of up to 100 m / min can be achieved when coating the transparent layer with the ink-receiving layer.
  • the transparent paper consists of at least two layers, namely a transparent layer and an ink or ink absorption layer, and that the transparent paper is admixed with fillers that reduce transparency.

Landscapes

  • Paper (AREA)
  • Ink Jet Recording Methods And Recording Media Thereof (AREA)

Abstract

A transparent paper consisting of at least one transparent layer composed of densely packed, finely ground fibres which contain transparency-reducing filling materials.

Description

Transparentpapier und Verfahren zur Herstellung eines Transparentpapieres Tracing paper and process for making a tracing paper
Die Erfindung betrifft ein Transparentpapier und ein Verfahren zur Herstellung eines Transparentpapieres.The invention relates to a transparent paper and a method for producing a transparent paper.
Um von hinten beleuchtete Flächen, die farbig, graphisch oder auf andere Weise ausgestaltet sind, bereitzustellen, ist man bislang auf den Einsatz von Kunststoffolien, meist als "Backlight-Folien" bezeichnet, angewiesen, da alle bekannten Transparentpapiere eine verschiedene Phasen aufweisende Grundstruktur besitzen, die sich beim Durchscheinen mit der eigentlichen Farbe bzw. graphischen Darstellung vermengt und auf diese Weise eine brilliante und konturscharfe Wiedergabe der auf dem Transparentpapier befindlichen Darstellung verhindert.In order to provide backlit surfaces that are colored, graphically or otherwise, it has hitherto been necessary to use plastic foils, usually referred to as "backlight foils", since all known transparent papers have a basic structure which has different phases, which mixes with the actual color or graphic representation when shining through and in this way prevents a brilliant and sharply contoured reproduction of the representation on the transparent paper.
Davon ausgehend liegt der Erfindung die Aufgabe zugrunde, ein Transparent bereitzustellen, welches sich als von hinten beleuchtetes Medium eignet. Des weiteren liegt der Erfindung die Aufgabe zugrunde, ein Verfahren zur Herstellung eines solchen Transparentpapieres anzugeben.Based on this, the object of the invention is to provide a transparency which is suitable as a backlit medium. Furthermore, the invention is based on the object of specifying a method for producing such a transparent paper.
Die Aufgabe wird gelöst durch ein Transparentpapier, welches zumindest eine Transparentschicht aus dicht gepackten, hoch ausgemahlenen Fasern, die Transparenz reduzierende Füllstoffe enthält, umfasst. Die Erfindung beruht auf der überraschenden Erkenntnis, dass der Transparentschicht Füllstoffe beigefügt werden können, ohne die Transparenz wesentlich zu beeinträchtigen, wobei der Begriff "transparent" hier im Sinne von "durchscheinend" (nicht-notwendigerweise durchsichtig) verwendet wird. Der Einsatz der Füllstoffe ermöglicht es erstmals, die ansonsten bei Transparentpapieren normalerweise sichtbaren Unregelmäßigkeiten zu kaschieren, da die Füllstoffe das durchtretende Licht diffus reflektieren, was zu einer durchaus gewünschten Reduzierung der Transparenz und insbesondere zu einer homogenen milchglasartigen Durchsicht führt.The object is achieved by means of a transparent paper which comprises at least one transparent layer of densely packed, highly ground fibers which contain transparency-reducing fillers. The invention is based on the surprising finding that fillers can be added to the transparent layer without significantly impairing the transparency, the term "transparent" being used here in the sense of "translucent" (not necessarily transparent). The use of the fillers makes it possible, for the first time, to conceal the irregularities that would otherwise normally be seen in transparent papers, since the fillers diffusely reflect the light passing through, which leads to a desired reduction in transparency and, in particular, to a homogeneous frosted glass-like view.
Bei einer bevorzugten Ausführungsform der Erfindung enthalten die Fasern der Transparentschicht Sulfat-Zellstoffasern, insbesondere langfaserige Sulfat-Zellstoffasern sowie Füllstoffe mit einem Gesamtgewicht von l bis 6 % des Gesamtgewichts der in der Transparentschicht enthaltenden Fasern.In a preferred embodiment of the invention, the fibers of the transparent layer contain sulfate pulp fibers, in particular long-fiber sulfate pulp fibers and fillers with a total weight of 1 to 6% of the total weight of the fibers contained in the transparent layer.
Als Füllstoffe haben sich Silicate, insbesondere Silicate aus der Gruppe der gefällten Calcium-, Aluminium-, Calcium-Aluminium- und Natrium- Aluminium-Silicate sowie ein Bleisilicat besonders bewährt. Durch den Einsatz dieser Füllstoffe entstehen im Papier zwei Phasen, wobei es an den Grenzflächen der Phasen zu einer Brechung des Lichtes und aufgrund des Sihcataufbaus sowie der Größe der Füllstoffe zu einer diffusen Streuung des Durchlichts kommt, so dass das Transparentpapier bei Beleuchtung von hinten gleichmäßig "milchig" erscheint. Die Füllstoffe wirken dabei wie wasserunlösliche, sich gegenüber den sonstigen Inhaltsstoffen der Transparentschicht chemisch neutral verhaltende, also mit diesen keine Bindungen eingehende Pigmente von kleinster Teilchengröße und sind im Regelfall weiß. Zur Erzielung besonderer Effekte können jedoch auch farbige Pigmente eingesetzt werden. Als besonders zweckmäßig hat es sich erwiesen, wenn die Korngröße der Pigmente zwischen 0,5 und 2,0 μm liegt.Silicates, in particular silicates from the group of precipitated calcium, aluminum, calcium aluminum and sodium aluminum silicates, and a lead silicate have proven particularly useful as fillers. The use of these fillers results in two phases in the paper, with the light refraction at the interfaces of the phases and a diffuse scattering of the transmitted light due to the Sihcat structure and the size of the fillers, so that the transparent paper is evenly illuminated when illuminated from behind " milky "appears. The fillers act like water-insoluble, compared to the other ingredients of The transparent layer is chemically neutral, that is, it does not enter into bonds with the smallest particle size and is usually white. However, colored pigments can also be used to achieve special effects. It has proven particularly expedient if the grain size of the pigments is between 0.5 and 2.0 μm.
Liegt der Brechungsindex der Pigmente ungefähr in der Größenordnung des Brechnungsindexes der Fasern der Transparentschicht, also Übehrlicherweise zwischen 1 ,5 und 1 ,6, wobei Zellulose einen Brechungsindex von 1 ,53 und die Pigmente aus den vorgenannten Materialien einen Brechungsindex von 1 ,56 bis 1 ,57 haben, und beträgt die Silicatkonzentration bezogen auf den Zellstoffmasseeinsatz etwa 2 bis 5 % , so erhält man ein Transparentpapier mit einer Transparenz von 30 bis 40 % , welches sich hervorragend zur Anwendung in Leuchtkästen und dergleichen eignet.If the refractive index of the pigments is approximately in the order of magnitude of the refractive index of the fibers of the transparent layer, i.e. usually between 1.5 and 1.6, cellulose has a refractive index of 1.53 and the pigments from the aforementioned materials have a refractive index of 1.56 to 1 , 57, and the silicate concentration based on the cellulose pulp is about 2 to 5%, so you get a transparent paper with a transparency of 30 to 40%, which is ideal for use in light boxes and the like.
Um eine gute Wasseraufnahmekapazität zu erreichen und das Transparentpapier gegen Wellenbildung und Knittern resistent zu machen, sollte das Papiergewicht der Transparentschicht, die sogenannte Grammage, im Bereich von 100 bis 250 g/nr, vorzugsweise zwischen etwa 150 und 200 g/m2 liegen, so dass das Papier einerseits stabil genug, andererseits aber auch elastisch genug ist, um zum Beispiel mittels handelsüblicher Tintenstahl- Drucker und -Plotter verarbeitet zu werden. Wegen der dichten Phaserpackung kann auf der Transparenzschicht eine Tintenaufnahmeschicht vorgesehen sein, die von der Transparenzschicht getragen wird. Hierdurch lässt sich ein Verlaufen von aufgebrachter flüssiger Farbe, insbesondere beim Bedrucken mittels Tintenstrahl-Druckern reduzieren bzw. zur Gänze vermeiden. Darüber hinaus lässt sich eine starke Wellenbildung der Transparenzschicht bei der Aufnahme von Feuchtigkeit vermeiden. Auf diese Weise lässt sich ein Druckbild mit scharfen Konturen bereitstellen, da die Farben dann weniger verlaufen, wobei unter dem Begriff "Farbe" hier auch schwarz verstanden wird.In order to achieve a good water absorption capacity and to make the transparent paper resistant to wave formation and creasing, the paper weight of the transparent layer, the so-called grammage, should be in the range of 100 to 250 g / nr, preferably between approximately 150 and 200 g / m 2 that the paper is sturdy enough on the one hand, but on the other hand also elastic enough to be processed, for example, using a standard ink-steel printer and plotter. Because of the dense phaser packing, an ink receiving layer can be provided on the transparency layer, which is carried by the transparency layer. In this way, bleeding of applied liquid ink, in particular when printing by means of inkjet printers, can be reduced or avoided entirely. In addition, a strong wave formation of the transparency layer can be avoided when absorbing moisture. In this way, a printed image with sharp contours can be provided since the colors then run less, whereby the term "color" is also understood to mean black here.
Im vorliegenden Zusammenhang ist der Begriff "Tinte" bzw. "Tintenaufnahmeschicht" in seiner allgemeinsten Form zu verstehen und umfasst jede Schicht, die geeignet ist, eine Farbe, Pigmente oder Tinten oder ähnliches in geeigneter Weise aufzunehmen und die nachteiligen Eigenschaften der Transparenzschicht zu vermindern. Insbesondere kann die Tintenaufnahmeschicht für eine Aufnahme von Tinten aus Tintenstrahl- Druckern ausgebildet sein. Sie kann aber auch für Siebdruck- oder Airbrush- Verfahren ausgelegt werden.In the present context, the term “ink” or “ink-receiving layer” is to be understood in its most general form and includes any layer which is suitable for appropriately absorbing a color, pigments or inks or the like and for reducing the disadvantageous properties of the transparency layer. In particular, the ink-receiving layer can be designed to receive inks from ink-jet printers. But it can also be designed for screen printing or airbrushing processes.
Als Tintenaufnahmeschicht, die man auch als Farbaufnahmeschicht bezeichnen könnte, hat sich beispielsweise eine Mischung aus teilverseiftem Polyvinylalkohol und/oder Polyvinylpyrrohdon, insbesondere im Verhältnis von 9: 1 , besonders bewährt. Um diese Schicht auf der Transparentschicht zu fixieren und gleichzeitig die Wasserfestigkeit gegen die bei üblichen Tintenstrahl-Druckern verwendeten Tinten zu verbessern, hat sich beispielsweise ein boraxhaltiges Bindemittel als zweckmäßig erwiesen. Dabei beruht dann die Fixierung der Tintenaufnahmeschicht auf der Transparentschicht auf einer Komplexbildung zwischen dem Polyvinylalkohol und dem Borax, wobei sich im sauren pH-Bereich ein Polyvinylalkohol-Borsäure-Monodiolkomplex ausbildet. Bei Verschiebung des pH-Wertes ins Alkalische entsteht ein Polyvinylalkohol-Borsäure- Diolkomplex. Zur Fixierung des Polyvinylalkohols eignen sich mehrwertige Metallionen der IV. bis VI. Hauptgruppe des Periodensystems insbesondere. Hier führen bereits geringe Konzentrationen zur Gelierung des Polyvinylalkohols.For example, a mixture of partially saponified polyvinyl alcohol and / or polyvinylpyrrohdon, in particular in a ratio of 9: 1, has proven particularly useful as an ink receiving layer, which could also be called a color receiving layer. In order to fix this layer on the transparent layer and at the same time to improve the water resistance against the inks used in conventional inkjet printers, there has been for example, a borax-containing binder has proven to be useful. The fixation of the ink-receiving layer on the transparent layer is then based on a complex formation between the polyvinyl alcohol and the borax, a polyvinyl alcohol-boric acid-monodiol complex being formed in the acidic pH range. When the pH is shifted to alkaline, a polyvinyl alcohol-boric acid-diol complex is formed. Polyvalent metal ions from IV to VI are suitable for fixing the polyvinyl alcohol. Main group of the periodic table in particular. Even low concentrations lead to the gelation of the polyvinyl alcohol.
Es versteht sich, dass eine derartige Tintenaufnahmeschicht auch unabhängig von den übrigen Eigenschaften der Transparenzschicht bzw. der Transparentpapieres für ein Bedrucken von Papierschichten mit extrem hohen Faserpackungen geeignet ist. Insbesondere kann eine derartige Schicht auch bei üblichen Transparentpapieren vorteilhaft Verwendung finden.It goes without saying that such an ink receiving layer is also suitable for printing on paper layers with extremely high fiber packs, regardless of the other properties of the transparency layer or the transparent paper. In particular, such a layer can also be used advantageously with conventional transparent papers.
Bei der Herstellung des Transparentpapieres kann zum Beispiel so vorgegangen werden, dass zunächst eine später die Tintenaufnahmeschicht tragende Papierschicht mit dicht gepackten Fasern aus einer hoch ausgemahlenen Zellstoffmasse unter Beifügung von wasserunlöslichen Pigmenten mit einem Anteil zwischen 2 und 5 Gewichtsprozent bezogen auf die Zellstoffmasse hergestellt wird. Sodann wird aus teil verseiftem Polyvinylalkohol und Polyvinylpyrrohdon ein Tintenaufnahmefluid angemischt, welches schließlich auf die Transparentschicht unter Beifügung eines boraxhaltigen Bindemittels aufgebracht wird.The transparent paper can be produced, for example, by first producing a paper layer with densely packed fibers from a highly ground pulp with the addition of water-insoluble pigments with a proportion of between 2 and 5 percent by weight, based on the pulp, with the densely packed fibers. Then an ink-receiving fluid is made from partially saponified polyvinyl alcohol and polyvinylpyrrohdon mixed, which is finally applied to the transparent layer with the addition of a borax-containing binder.
Dabei kann die als Tintenaufnahmeschicht wirkende Polymerlösung mit üblichen Beschichtungsverfahren wie zum Beispiel Rollrakel , Blade und anderen gängigen Beschichtungsverfahren auf das Transparentpapier aufgebracht werden. Je nach Art der verwendeten Beschichtungstechnik und -maschine können beim Beschichten der Transparentschicht mit der Tintenaufnahmeschicht Beschichtungsgeschwindigkeiten von bis zu 100 m/min erreicht werden.The polymer solution acting as an ink-receiving layer can be applied to the transparent paper using conventional coating methods such as, for example, doctor blades, blades and other common coating methods. Depending on the type of coating technology and machine used, coating speeds of up to 100 m / min can be achieved when coating the transparent layer with the ink-receiving layer.
Im Rahmen des Erfindungsgedankens sind zahlreiche Abwandlungen und Weiterbildungen möglich, die sich zum Beispiel auf den Anteil und die Art der eingesetzten Füllstoffe sowie auf die Art und Zusammensetzung der als Tintenaufnahmeschicht wirkenden Schicht beziehen. Erfindungswesentlich ist jedenfalls, dass das Transparentpapier aus wenigstens zwei Schichten, nämlich einer Transparentschicht und einer Tinten- bzw. Farbaufnahmeschicht besteht und dass dem Transparentpapier transparenzreduzierende Füllstoffe beigemischt sind. Within the framework of the inventive concept, numerous modifications and further developments are possible, which relate, for example, to the proportion and type of fillers used and to the type and composition of the layer which acts as an ink-receiving layer. In any case, it is essential to the invention that the transparent paper consists of at least two layers, namely a transparent layer and an ink or ink absorption layer, and that the transparent paper is admixed with fillers that reduce transparency.

Claims

Patentansprüche: claims:
1 . Transparentpapier, gekennzeichnet durch eine Transparentschicht aus dicht gepackten, hoch ausgemahlenen Fasern, die Transparenz reduzierende Füllstoffe enthält.1 . Transparent paper, characterized by a transparent layer of densely packed, highly ground fibers that contains transparency-reducing fillers.
2. Transparentpapier nach Anspruch 1 , dadurch gekennzeichnet, dass die Fasern der Transparentschicht Zellstofffasern, insbesondere langfaserige Sulfat-Zellstoffasern, enthalten.2. Transparent paper according to claim 1, characterized in that the fibers of the transparent layer contain cellulose fibers, in particular long-fiber sulfate cellulose fibers.
3. Transparentpapier nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Transparentschicht Füllstoffe mit einem Gesamtgewicht von bis zum 10 % , vorzugsweise von 1 bis 6 % , des Gesamtgewichts der in der3. Transparent paper according to claim 1 or 2, characterized in that the transparent layer fillers with a total weight of up to 10%, preferably from 1 to 6%, of the total weight in the
Transparentschicht enthaltenen Fasern enthält.Contains transparent layer containing fibers.
4. Transparentpapier nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Füllstoffe im wesentlichen ein oder mehrere Silicate, insbesondere aus der Gruppe der gefällten Calcium-, Aluminium-, Calcium-Aluminium-, Natrium-Aluminium-Silicate oder ein Bleisilicat, enthalten.4. transparent paper according to one of claims 1 to 3, characterized in that the fillers essentially one or more silicates, in particular from the group of precipitated calcium, aluminum, calcium aluminum, sodium aluminum silicates or a lead silicate, contain.
5. Transparentpapier nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Füllstoffe Calciumcarbonat und/oder Kieselsäure und/oder Titanoxid enthalten.5. Transparent paper according to one of claims 1 to 4, characterized in that the fillers contain calcium carbonate and / or silica and / or titanium oxide.
6. Transparentpapier nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Füllstoffe wasserunlösliche gegenüber den sonstigen Inhaltsstoffen der Transparentschicht chemisch neutrale Pigmente enthalten.6. Transparent paper according to one of claims 1 to 5, characterized in that the fillers are water-insoluble compared to other ingredients of the transparent layer contain chemically neutral pigments.
7. Transparentpapier nach Anspruch 6, dadurch gekennzeichnet, dass die Korngröße der Pigmente zwischen 0, 1 und 5 μm, vorzugsweise zwischen 0,5 und 2,0 μm liegt.7. Transparent paper according to claim 6, characterized in that the grain size of the pigments is between 0.1 and 5 μm, preferably between 0.5 and 2.0 μm.
8. Transparentpapier nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass der Brechungsindex der Pigmente in der Größenordnung des Brechungsindexes der Fasern der Transparentschicht liegt.8. Transparent paper according to claim 6 or 7, characterized in that the refractive index of the pigments is in the order of the refractive index of the fibers of the transparent layer.
9. Transparentpapier nach Anspruch 8, dadurch gekennzeichnet, dass der Brechungsindex der Fasern und der Brechungsindex der Pigmente zwischen 1 ,5 und 1 ,6 liegt.9. Transparent paper according to claim 8, characterized in that the refractive index of the fibers and the refractive index of the pigments is between 1.5 and 1.6.
10. Transparentpapier nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass die Transparenz der Transparentschicht zwischen 25 und 45 % , vorzugsweise zwischen 30 und 40 % , liegt.10. Transparent paper according to one of claims 1 to 9, characterized in that the transparency of the transparent layer is between 25 and 45%, preferably between 30 and 40%.
1 1. Transparentpapier nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass die Grammage der Transparentschicht im Bereich von 100 bis 250 g/m2, vorzugsweise zwischen etwa 150 bis 200 g/m2, liegt.1 1. Transparent paper according to one of claims 1 to 10, characterized in that the grammage of the transparent layer is in the range from 100 to 250 g / m 2 , preferably between about 150 to 200 g / m 2 .
12. Transparentpapier nach einem der Ansprüche 1 bis 1 1 , dadurch gekennzeichnet, dass die Transparentschicht als Trägerschicht eine saugfähige Tintenaufnahmeschicht trägt. 12. Transparent paper according to one of claims 1 to 1 1, characterized in that the transparent layer carries an absorbent ink-receiving layer as a carrier layer.
13. Transparentpapier nach Anspruch 12, dadurch gekennzeichnet, dass die Tintenaufnahmeschicht teilverseiften Polyvinylalkohol und/oder Polyvinylpyrrolidon, vorzugsweise im Verhältnis von 9 Teilen Polyvinylalkohol auf 1 Teil Polyvinylpyrrolidon, enthält.13. Transparent paper according to claim 12, characterized in that the ink-receiving layer contains partially hydrolyzed polyvinyl alcohol and / or polyvinylpyrrolidone, preferably in a ratio of 9 parts of polyvinyl alcohol to 1 part of polyvinylpyrrolidone.
14. Transparentpapier nach Anspruch 12 oder 13, dadurch gekennzeichnet, dass die Tintenaufnahmeschicht unter Beifügung eines Bindemittels auf die Transparentschicht aufgebracht ist.14. Transparent paper according to claim 12 or 13, characterized in that the ink-receiving layer is applied to the transparent layer with the addition of a binder.
15. Transparentpapier nach Anspruch 14, dadurch gekennzeichnet, dass das Bindemittel ein Komplexbildner ist.15. Transparent paper according to claim 14, characterized in that the binder is a complexing agent.
16. Transparentpapier nach einem der Ansprüche 14 oder 15, dadurch gekennzeichnet, dass das Bindemittel Borax (Di-Natriumtetraborat) enthält.16. Transparent paper according to one of claims 14 or 15, characterized in that the binder contains borax (disodium tetraborate).
17. Transparentpapier nach einem der Ansprüche 13 bis 15, dadurch gekennzeichnet, dass der Polyvinylalkohol mittels mehrwertiger Metallionen der IV. bis VI. Nebengruppe des Periodensystems in der17. Transparent paper according to one of claims 13 to 15, characterized in that the polyvinyl alcohol by means of polyvalent metal ions of IV. To VI. Subgroup of the periodic table in the
Tintenaufnahmeschicht fixiert ist.Ink receiving layer is fixed.
18. Verfahren zur Herstellung eines Transparenpapieres, bei welchem eine Schicht mit dicht gepackten Fasern aus einer hoch ausgemahlenen Zellstoffmasse unter Beifügen von wasserunlöslichen Pigmenten hergestellt wird. 18. A process for producing a transparent paper, in which a layer with tightly packed fibers is produced from a highly ground pulp with the addition of water-insoluble pigments.
19. Verfahren nach Anspruch 18, dadurch gekennzeichnet, dass der Anteil der wasserunlöslichen Pigmente zu 10 Gewichtsprozent bezogen auf die Zellstoffmasse beträgt.19. The method according to claim 18, characterized in that the proportion of water-insoluble pigments is 10 percent by weight based on the pulp mass.
20. Verfahren nach Anspruch 18 oder 19, dadurch gekennzeichnet, dass auf die Schicht mit dicht gepackten Fasern eine Schicht eines20. The method according to claim 18 or 19, characterized in that on the layer with tightly packed fibers a layer of
Tintenaufnahmefluids aufgebracht wird.Ink receiving fluid is applied.
21 . Verfahren nach Anspruch 20, dadurch gekennzeichnet, dass das Tintenaufnahmefluid unter Beifügen eines Bindemittels auf die Schicht aufgebracht wird. 21. A method according to claim 20, characterized in that the ink receiving fluid is applied to the layer with the addition of a binder.
EP00958252A 1999-09-09 2000-08-16 Transparent paper and method for the production thereof Expired - Lifetime EP1216325B1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19942989A DE19942989A1 (en) 1999-09-09 1999-09-09 Transparent paper useful for back-lit applications, has transparent layer of tightly packed, highly milled fibers containing filler reducing transparency
DE19942989 1999-09-09
US21113300P 2000-06-13 2000-06-13
US211133P 2000-06-13
PCT/DE2000/002762 WO2001018312A1 (en) 1999-09-09 2000-08-16 Transparent paper and method for the production thereof

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EP1216325A1 true EP1216325A1 (en) 2002-06-26
EP1216325B1 EP1216325B1 (en) 2004-05-19

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AU (1) AU6983800A (en)
DE (1) DE10082677D2 (en)
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WO2012105939A1 (en) * 2011-01-31 2012-08-09 Hewlett-Packard Development Company, L.P. Graphic medium and method of making same
DE102014003418B4 (en) * 2014-03-13 2017-01-05 Carl Freudenberg Kg Element for light manipulation

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US1924573A (en) * 1932-01-19 1933-08-29 Brown Co Fibrous web for artificial leathers or the like
US3839144A (en) * 1970-09-21 1974-10-01 W Lounden Paper having 60{14 97 percent hydrated cellulosic fibers and 3{14 40 percent unhydrated cellulosic fibers
SE441109B (en) * 1984-01-19 1985-09-09 Svenska Traeforskningsinst PAPERS WITH IMPROVED FEATURES AND WAYS TO MAKE IT SAME
JPH07115352B2 (en) * 1990-01-23 1995-12-13 東レ株式会社 Prepreg manufacturing method
JPH0473298A (en) * 1990-07-13 1992-03-09 Mitsubishi Paper Mills Ltd Transparent paper for second original drawing
JPH05104848A (en) * 1991-10-15 1993-04-27 Sanyo Kokusaku Pulp Co Ltd Ink jet recording paper
JP3731906B2 (en) * 1994-02-09 2006-01-05 三菱製紙株式会社 Laminated transparent paper for ink jet
JP3518714B2 (en) * 1996-09-25 2004-04-12 三菱製紙株式会社 Transparent paper for inkjet recording

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Title
See references of WO0118312A1 *

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WO2001018312A1 (en) 2001-03-15
AU6983800A (en) 2001-04-10
EP1216325B1 (en) 2004-05-19
ES2223572T3 (en) 2005-03-01

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