EP0761876B1 - Coating method for paper or cardboard - Google Patents

Coating method for paper or cardboard Download PDF

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Publication number
EP0761876B1
EP0761876B1 EP95114103A EP95114103A EP0761876B1 EP 0761876 B1 EP0761876 B1 EP 0761876B1 EP 95114103 A EP95114103 A EP 95114103A EP 95114103 A EP95114103 A EP 95114103A EP 0761876 B1 EP0761876 B1 EP 0761876B1
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EP
European Patent Office
Prior art keywords
cardboard
paper
coat
process according
primer
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EP95114103A
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German (de)
French (fr)
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EP0761876A1 (en
Inventor
Bernhard Dettling
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Individual
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Individual
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Priority to EP95114103A priority Critical patent/EP0761876B1/en
Priority to DE59501382T priority patent/DE59501382D1/en
Priority to ES95114103T priority patent/ES2114255T3/en
Priority to AT95114103T priority patent/ATE162866T1/en
Publication of EP0761876A1 publication Critical patent/EP0761876A1/en
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Publication of EP0761876B1 publication Critical patent/EP0761876B1/en
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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
    • D21H19/80—Paper comprising more than one coating
    • D21H19/82—Paper comprising more than one coating superposed
    • D21H19/826—Paper comprising more than one coating superposed two superposed coatings, the first applied being pigmented and the second applied being non-pigmented
    • 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
    • D21H27/10—Packing paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/18—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising waxes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/58—Polymers or oligomers of diolefins, aromatic vinyl monomers or unsaturated acids or derivatives thereof

Definitions

  • the invention relates to a method for coating paper or cardboard for creation an aroma and vapor barrier.
  • vapor and aroma barriers are achieved through coatings that are a mixture of several, preferably three polymers, namely paraffin, carboxylated styrene butadiene as well as polyacrylate (EP-A 0 393 451).
  • the disadvantage of this coating is that the coating slip can contain a lot of wax to make it necessary Achieve vapor and aroma barrier. This extra material means higher costs, and above all problems with recycling and heat sealing.
  • DE-A 42 27 184 describes an impregnating agent for the production of papers penetration resistance to greases, oils and aqueous media.
  • surface sizing takes place, in particular by means of a size press in the paper machine.
  • penetration resistance achieved with this method is only slight and by no means a vapor barrier.
  • the invention Combination line with a specific primer and with another, suitable for creating a vapor barrier has all essential Advantages of the previous PE-coated papers or boxes and thus represents a full-fledged one Substitute for these.
  • coated papers or boxes depending on the respective certification of the used top coat component (s) and their layer thickness as ream wrapping paper Moisture protection, heat-sealable wrapping paper for the production of armored packaging for paper rolls, wrapping paper with moisture protection, packaging for food, Aroma protection packaging, packaging for liquid food, packaging for bulk goods, washing powder packaging, insulation papers for the construction industry, wallpaper papers etc. usable.
  • the components of the primer coating are in their Original state, i.e. dissolved in water prior to application and can so be applied. The polymerization then takes place after the application.
  • the application quantity of the primer is between 2.5 and 5 g / m 2 depending on the nature of the base paper.
  • a barrier effect according to DIN 53122 Klima D by the primer alone is not measurable (over 135 g / m 2 / 24h).
  • the primer according to the invention almost completely prevents the migration of polymer dispersions into the paper or cardboard. This results in improved networking and thus a denser film build-up, as well as a reduction in the required application quantity (layer thickness).
  • top coat in the coating slip suggests that the Spread of the top coat a copolymer modified with carnauba and paraffin wax of styrene and butadiene or an ethylene / methacrylic acid polymer dispersion or a contains carboxylated styrene-butadiene copolymer or a styrene-acrylate copolymer dispersion.
  • the top coat can be an additional coat with a coating of a styrene-acrylate copolymer dispersion contain.
  • a further development of the coating slip of the top coat suggests that it is in a liquid Solvent, especially water, is dissolved.
  • the components of the coating slip of the top line are in their original state, i.e. before the order especially in Dissolved water and are so applied.
  • top coat be a polyvinyl acetate is added.
  • the application of the primer and top coat by means of a doctor blade, engraving systems or modifications thereof.
  • the order the primer and top coat can thus be achieved using known coating techniques, which are suitable for achieving thin coating layers. Preferably be used machines with two coaters.
  • the paper or the cardboard is on both sides is coated.
  • the coatings can of course accordingly the respective requirements on the two sides may be different, with the most varied Combinations of the primers and top coats according to the invention are conceivable.
  • the paper or cardboard is surface-sized is. This compresses and supports the paper or cardboard surface hence the effect of the primer.
  • An embodiment of a paper or cardboard according to the invention is as follows described with reference to the drawing. This shows a in a purely schematic representation kind of cut through such paper or cardboard, which first with a primer and then with a top coat to create an aroma and vapor barrier has been coated.
  • paper or cardboard 1 is initially closed in a purely schematic manner detect. It can also be recycled paper, for example.
  • a primer 2 is applied to the paper or cardboard 1.
  • the chemical composition this primer 2 has been previously described. It is in the drawing recognizable that the primer 2 almost completely in the surface area of the paper or Cartons 1 penetrates.
  • the special selection of the individual components in this primer 2 guarantees saturation of the capillary fiber structure of the substrate after the polymerization and covers them with one amorphous network structure.
  • With a suitably coordinated rheology of the primer 2 subsequently applied top coat 3 the remaining in the primer 2 Openings for a good anchoring of this top coat 3, knocking away is effectively prevented. This ensures that the polymerization is optimal necessary aqueous components remain in the top coat mass long enough and an improved arrangement of the film-forming molecules arises.
  • a one-sided coating is provided.
  • both the front and the back of the paper or boxes 1 are each provided with a coating according to the invention.

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  • Paper (AREA)
  • Laminated Bodies (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)

Abstract

The inner layer (2) of a two-layer coating (2,3) to give an aroma- and vapour-barrier on paper or cardboard (1) consists of: (a) amorphous SiO2, Al oxide, PVA and a copolymer of styrene-butadiene with acrylonitrile; or (b) silicic acid (opt. pptd.), PVA and the same copolymer as in (a). In each of (a) and (b) additional components may also be present.

Description

Die Erfindung betrifft ein Verfahren zum Beschichten von Papier oder Karton zur Schaffung einer Aroma- und Dampfsperre.The invention relates to a method for coating paper or cardboard for creation an aroma and vapor barrier.

Derart beschichtete Papiere oder Kartons zur Schaffung einer Aroma- und Dampfsperre haben vielfältige Verwendungszwecke. Abhängig von der jeweiligen Zertifizierung der verwendeten Deckstrichkomponente(n) und deren Schichtdicke finden die so ausgebildeten Papiere oder Kartons beispielsweise Verwendung als Rieseinschlagpapier mit Feuchtigkeitsschutz, heißsiegelfähiges Packpapier zur Herstellung von Panzerverpackungen für Papierrollen, Packpapier mit Feuchtigkeitsschutz, Verpackungsmittel für Lebensmittel, Aromaschutzverpackungen, Verpackungen für flüssige Lebensmittel, Verpackungen für Schüttgüter, Waschpulververpackungen, Isolationspapiere für die Bauindustrie, Taptenpapiere sowie als problemloser Wertstoff beim Recyclingprozeß. Gefordert an das Papier oder den Karton unter Erhaltung aller wesentlichen Vorteile dieser Papiere oder Kartons ist eine ausreichende Dampf- und Aromadichte, daß sie weiterhin lebensmittelrechtlich unbedenklich sowie weiterhin öl- und fettabweisend sind. Darüber hinaus müssen sie geschmacks- und geruchsneutral, verklebbar mit speziellen Klebern, siegelfähig gegen sich selbst und andere Kunststoffbeschichtungen sein. Darüber hinaus sollten sie problemlos der Wiederverwertung zugeführt werden können und ein relativ geringes Auftragsgewicht haben.Papers or boxes coated in this way to create an aroma and vapor barrier have a variety of uses. Depending on the respective certification of the used The top coat component (s) and their layer thickness are found in this way Papers or boxes, for example, use as giant wrapping paper with moisture protection, heat-sealable wrapping paper for the production of armored packaging for Paper rolls, wrapping paper with moisture protection, packaging for food, aroma protection packaging, Packaging for liquid food, packaging for Bulk goods, washing powder packaging, insulation papers for the construction industry, wallpaper papers and as a problem-free resource in the recycling process. Required on paper or The cardboard box while maintaining all the essential advantages of these papers or cardboard boxes is one sufficient vapor and aroma density that they continue to be food-safe as well as being oil and fat repellent. In addition, they must and odorless, can be glued with special adhesives, sealable against yourself and other plastic coatings. In addition, they should be easy to recycle can be supplied and have a relatively low order weight.

Bisher ist es bekannt, zur Schaffung derartiger Papiere oder Kartons diese mit einer Polyethylen-Beschichtung zu versehen. Allerdings ist wegen der allgemein bekannten Probleme beim Recycling von PE-beschichteten Papieren oder Kartons diese Art von Beschichtung doch mit erheblichen Nachteilen behaftet.So far, it is known to create such papers or boxes with a polyethylene coating to provide. However, because of the well-known problems this type of coating when recycling PE-coated paper or cardboard but has considerable disadvantages.

Weiterhin wurden als Altemative zu der PE-Beschichtung zur Lösung der damit verbundenen Problematiken Beschichtungen mittels Polyvinylidenchlorid (PVDC) mit mindestens 15 g/m2 durchgeführt (EP-A 0 375 924). Diese PVDC-Beschichtungen haben jedoch den Nachteil der Chlorverbindung. Außerdem muß auf den Barrierestrich aus PVDC ein weiterer Mineralstrich aufgetragen werden, um eine Bedruckung durchführen zu können. Dies stellt allerdings ein umständliches Verfahren dar.Furthermore, as alternatives to the PE coating to solve the associated Problems with polyvinylidene chloride (PVDC) coatings with at least 15 g / m2 carried out (EP-A 0 375 924). However, these PVDC coatings have that Disadvantage of the chlorine compound. In addition, another must be placed on the PVDC barrier screed Mineral line can be applied to be able to print. This poses however, it is a cumbersome process.

Mittlerweile erzielt man Dampf- und Aromasperren durch Beschichtungen, die eine Mischung von mehreren, vorzugsweise drei Polymeren, nämlich Paraffin, carboxyliertes Styrolbutadien sowie Polyacrylat darstellen (EP-A 0 393 451). Der Nachteil dieser Beschichtung liegt darin, daß in der Streichmasse sehr viel Wachs enthalten sein kann, um die notwendige Dampf- und Aromasperre zu erzielen. Dieser Aufwand an Mehrmaterial bedeutet höhere Kosten, sowie vor allem Probleme beim Recycling und der Heißsiegelfähigkeit.In the meantime, vapor and aroma barriers are achieved through coatings that are a mixture of several, preferably three polymers, namely paraffin, carboxylated styrene butadiene as well as polyacrylate (EP-A 0 393 451). The disadvantage of this coating is that the coating slip can contain a lot of wax to make it necessary Achieve vapor and aroma barrier. This extra material means higher costs, and above all problems with recycling and heat sealing.

In der DE-A 42 27 184 ist ein Imprägniermittel zur Herstellung von Papieren zur Erzielung eines Durchdringungswiderstandes gegen Fette, Öle und wässrige Medien offenbart. Dabei erfolgt eine Oberflächenleimung, insbesondere mittels einer Leimpresse in der Papiermaschine. Allerdings ist der bei diesen Verfahren erzielte Durchdringungswiderstand nur geringfügig und keinesfalls eine Dampfbarriere.DE-A 42 27 184 describes an impregnating agent for the production of papers penetration resistance to greases, oils and aqueous media. Here surface sizing takes place, in particular by means of a size press in the paper machine. However, the penetration resistance achieved with this method is only slight and by no means a vapor barrier.

Der Mangel der bisher bekannten Papiere oder Kartons besteht darin, daß die für viele Verpackungszwecke erforderlichen Dampf- und Aromadichten sich nur mit sehr dicken Schichten erreichen lassen, die teilweise nur bei mehrfach aufgetragenen Vor- und Deckstrichen erzielt werden, wobei der Vorstrich die Aromasperre und der Deckstrich die Dampfsperre gewährleisten soll. Der in diesen Strichen enthaltene Wachsanteil erreicht jedoch Größenordnungen, die einer problemlosen Rückführung zur Wiederverwertung entgegenstehen.The lack of the previously known papers or cardboard boxes is that they are used for many packaging purposes required vapor and aroma densities are only possible with very thick ones Allow layers to be reached, sometimes only with multiple primers and top coats can be achieved, with the pre-coat the aroma barrier and the top coat the vapor barrier guarantee. However, the amount of wax contained in these lines reaches Orders of magnitude that stand in the way of easy recycling for recycling.

In der nachveröffentlichten, jedoch zum Stand der Technik gehörenden EP-A-0 671 506 ist ein Verfahren zum Beschichten von Papier oder Karton zur Schaffung einer Aroma- und Dampfsperre mit Vorstrich und Deckstrich offenbart, bei der der Vorstrich aus einer ganz bestimmten Zusammensetzung von chemischen Substanzen besteht. Als weitere Komponente kann der Vorstrich zusätzlich noch Stärke enthalten.In the post-published EP-A-0 671 506, which however belongs to the prior art a process for coating paper or cardboard to create a flavor and Vapor barrier with primer and top coat revealed, in which the primer consists of a whole certain composition of chemical substances. As another component the primer can also contain starch.

Der Erfindung liegt die Aufgabe zugrunde, mit einem verbesserten Beschichtungsverfahren ein verbessertes Papier oder einen verbesserten Karton mit einer aus Vorstrich und Deckstrich bestehenden Beschichtung zur Schaffung einer Aroma- und Dampfsperre zu schaffen.The object of the invention is to create an improved paper or an improved cardboard with a coating consisting of a primer and top coat to create an aroma and vapor barrier using an improved coating method.

Die technische Lösung ergibt sich aus den Merkmalen der nebengeordneten Ansprüche 1 und 2. The technical solution results from the features of the independent claims 1 and 2.

Dadurch ist ein Papier oder ein Karton mit einer verbesserten (Wasser-)Dampf- und Aromadichte geschaffen, wobei beliebiges Rohpapier, beispielsweise auch Recyclingpapier, oder beliebiger Karton verwendet werden kann, auf den zunächst der Vorstrich und anschließend der Deckstrich aufgetragen wird. Die Erfindungsidee besteht dabei in einem ganz speziellen Kombinationsstrich zur Erstellung der Sperre im Sinne eines synergetischen Effektes, nämlich als erfindungswesentlicher Schritt die Verknüpfung des speziellen, erfindungsgemäßen Vorstriches mit bereits bekannten Sperrschichtstrichen als Deckstrich. Die beschriebenen Vorstriche verbessern die bislang nur unzureichend genutzten Eigenschaften dieser Deckstriche erheblich und erzielen im Hinblick auf das Gesamtstrichgewicht mit herkömmlichen PE-Beschichtungen vergleichbare Barrierewerte. Der erfindungsgemäße Vorstrich dringt dabei fast vollständig in den Oberflächenbereich des Papiers oder Kartons ein. Die spezielle Auswahl der einzelnen Komponenten im Vorstrich garantiert nach erfolgter Polymerisation der Komponenten nach deren Auftrag eine Saturierung der kapillaren Faserstruktur des Papiers oder Kartons und überzieht diese mit einer amorphen Netzstruktur. Bei einer entsprechend abgestimmten Rheologie des Deckstriches reichen die im Vorstrich verbleibenden Öffnungen zu einer guten Verankerung des Deckstriches aus, wobei ein Wegschlagen wirksam unterbunden wird. Somit wird erreicht, daß die zu einer optimalen Polymerisation notwendigen wässrigen Bestandteile lange genug in der Deckstrichmasse bleiben und eine verbesserte Anordnung der filmbildenden Moleküle entsteht. Der erfindungswesentliche Kern liegt somit darin, daß zur Erzielung der geforderten Barriere ein eine Dampfsperre erzeugender, beliebiger Deckanstrich auf einen speziellen Vorstrich der Erfindung aufgetragen wird. So ist eine Barrierewirkung durch den Vorstrich alleine gemäß DIN 53122 Klima D nicht meßbar (über 135 g/m2/24h). Allerdings verhindert der Vorstrich fast vollständig die Migration von Polymerdispersionen des Deckstrichs in das Papier oder den Karton. Daraus resultiert eine verbesserte Vernetzung und damit ein dichterer Filmaufbau, ebenso wie die Reduzierung der erforderlichen Auftragsmenge, welche in einer dünnen Schichtdicke resultiert. Der erfindungsgemäße Kombinationsstrich mit einem bestimmten Vorstrich sowie mit einem weiteren, zur Erzeugung einer Dampfsperre geeigneten Deckstrich besitzt alle wesentlichen Vorteile der bisherigen PE-beschichteten Papiere oder Kartons und stellt somit einen vollwertigen Ersatz für diese dar. Diese Vorteile sind ausreichende Dampf- und Aromadichte, die Papiere und Kartons sind lebensmittelrechtlich unbedenklich, öl- und fettabweisend, geschmacks- und geruchsneutral, verklebbar mit speziellen Klebern, siegelfähig gegen sich selbst und andere Kunststoffbeschichtungen. Vor allem sind die erfindungsgemäßen Papiere oder Kartons problemlos der Wiederverwertung zuführbar und weisen ein relativ geringes Auftragsgewicht auf. So ist die Rückführung der erfindungsgemäßen Papiere oder Kartons in den Wertstoffkreislauf im Gegensatz zu den herkömmlichen PE-beschichteten Substraten wesentlich einfacher möglich und damit kostengünstiger. Durch die schon bei relativ geringen Auftragsgewichten realisierten hohen Sperrschichtwerte können im Vergleich zu den bisherigen Beschichtungsverfahren, insbesondere auch im Vergleich zu den PE-Beschichtungen Resourcen gespart werden. Somit sind die nach dem erfindungsgemäßen Verfahren gestrichenen Papiere oder Kartons abhängig von der jeweiligen Zertifizierung der verwendeten Deckstrichkomponente(n) und deren Schichtdicke als Rieseinschlagpapier mit Feuchtigkeitsschutz, heißsiegelfähigem Packpapier zur Herstellung von Panzerverpackungen für Papierrollen, Packpapier mit Feuchtigkeitsschutz, Verpackungsmittel für Lebensmittel, Aromaschutzverpackungen, Verpackungen für flüssige Lebensmittel, Verpackungen für Schüttgüter, Waschpulververpackungen, Isolationspapiere für die Bauindustrie, Tapetenpapiere etc. verwendbar. Die Komponenten der Streichmasse des Vorstrichs sind in ihrem Ursprungszustand, d.h. vor dem Auftrag insbesondere in Wasser gelöst und können so aufgetragen werden. Nach dem Auftrag findet dann die Polymerisation statt. This makes a paper or cardboard with an improved (water) vapor and aroma density created, whereby any raw paper, for example also recycled paper, or any cardboard can be used, first on the primer and then the top coat is applied. The idea of the invention consists in one very special combination stroke to create the lock in the sense of a synergetic Effect, namely as a step essential to the invention the linking of the special Primer according to the invention with already known barrier coating lines as a top coat. The primers described improve the properties that have so far been underused of these top coats considerably and achieve with regard to the total coat weight Barrier values comparable to conventional PE coatings. The invention Primer almost completely penetrates the surface area of the paper or cardboard a. The special selection of the individual components in the primer guarantees after they have been made Polymerization of the components after their application saturation of the capillaries Fiber structure of paper or cardboard and covers them with an amorphous network structure. With a correspondingly coordinated Rheology of the top coat extends the openings remaining in the primer to one good anchoring of the top coat, effectively preventing striking becomes. It is thus achieved that the aqueous necessary for optimal polymerization Components remain in the top coat mass long enough and an improved arrangement of the film-forming molecules. The essence of the invention is thus that a top coat that creates a vapor barrier to achieve the required barrier is applied to a special primer of the invention. So that's a barrier effect cannot be measured by the primer alone according to DIN 53122 Klima D (over 135 g / m2 / 24h). However, the primer almost completely prevents the migration of polymer dispersions of the top coat in the paper or cardboard. This results in an improved Networking and thus a denser film structure, as well as the reduction of the required Application quantity, which results in a thin layer thickness. The invention Combination line with a specific primer and with another, suitable for creating a vapor barrier has all essential Advantages of the previous PE-coated papers or boxes and thus represents a full-fledged one Substitute for these. These advantages are sufficient vapor and aroma density, the papers and boxes are safe under food law, oil and fat repellent, tasteless and odorless, can be glued with special adhesives, sealable against itself itself and other plastic coatings. Above all, the papers according to the invention or boxes can be easily recycled and are relatively small Order weight on. So is the return of the papers or boxes of the invention into the recycling cycle in contrast to conventional PE-coated substrates much easier and therefore cheaper. By already at relative Low junction weights can achieve high junction values compared to the previous coating processes, especially when compared to PE coatings Resources are saved. Thus, according to the invention Process coated papers or boxes depending on the respective certification of the used top coat component (s) and their layer thickness as ream wrapping paper Moisture protection, heat-sealable wrapping paper for the production of armored packaging for paper rolls, wrapping paper with moisture protection, packaging for food, Aroma protection packaging, packaging for liquid food, packaging for bulk goods, washing powder packaging, insulation papers for the construction industry, wallpaper papers etc. usable. The components of the primer coating are in their Original state, i.e. dissolved in water prior to application and can so be applied. The polymerization then takes place after the application.

Eine Weiterbildung der Ansprüche 1 oder 2 sieht vor, daß als weitere Komponente(n) für die Streichmasse des Vorstrichs ein Entschäumer und/oder ein Dispergiermittel und/oder ein Retensionsmittel vorgesehen ist (sind). Bei dem Retensionsmittel handelt es sich um einen Verdicker oder Verdünner, der die Viskosität und damit die Laufeigenschaften der Streichmasse während des Auftrags beeinflußt. Selbstverständlich können auch andere Komponenten und/oder weitere Komponenten für die Streichmasse des Vorstrichs vorgesehen sein, welche beispielsweise die erfindungsgemäßen Vorteile weiter fördernd unterstützen.A further development of claims 1 or 2 provides that as a further component (s) for the coating slip of the primer is a defoamer and / or a dispersant and / or a retention agent is (are) provided. The retention agent is a thickener or thinner, the viscosity and thus the running properties of the Coating mass affected during the application. Of course, others can too Components and / or other components are provided for the coating slip of the primer be, which, for example, further support the advantages according to the invention.

Eine Weiterbildung der Ansprüche 3 oder 4 sieht vor, daß die Streichmasse des Vorstnchs zusätzlich noch Stärke enthält. A further development of claims 3 or 4 provides that the coating slip of the projection additionally contains starch.

Vorzugsweise beträgt die Auftragsmenge des Vorstrichs 2,5 bis 5 g/m2. Dabei hängt die Auftragsmenge von der Beschaffenheit des Rohpapiers oder des Kartons ab.The application amount of the primer is preferably 2.5 to 5 g / m 2 . The order quantity depends on the nature of the base paper or the cardboard.

Eine weitere Weiterbildung schlägt vor, daß die Streichmasse des Deckstrichs eine Polymerdispersion oder eine Mischung von mehreren Polymerdispersionen enthält. Dabei kann es sich beispielsweise um Ethylen/Methacrylat, Polyvinylacetat, Styrol-Butadien oder der daraus abgeleiteten Copolymere handeln. Wesentlich bei diesen Polymerdispersionen ist die Tatsache, daß diese Komponenten, die für sich allein genommen nur relativ geringe Dampfdichten von ungefähr 15 bis 20 g/m2/24h (bei Auftragsmengen von 20 g/m2 Trockengewicht) erzielen, in Verbindung mit dem speziellen, erfindungsgemäßen Vorstrich jedoch erheblich höhere Barrierewirkungen, nämlich 4 bis 10 g/m2/24h bei deutlich reduzierten Auftragsmengen (5 bis 10 g/m2) erreichen. Die Auftragsmenge des Vorstriches liegt dabei je nach Beschaffenheit des Rohpapieres zwischen 2,5 und 5 g/m2. Eine Barrierewirkung nach DIN 53122 Klima D durch den Vorstrich allein ist nicht meßbar (über 135 g/m2/24h). Allerdings verhindert der erfindungsgemäße Vorstrich fast vollständig die Migration von Polymerdispersionen in das Papier oder den Karton. Daraus resultiert eine verbesserte Vernetzung und damit ein dichterer Filmaufbau ebenso wie die Reduzierung der erforderlichen Auftragsmenge (Schichtdicke). A further development suggests that the coating slip of the top coat contains a polymer dispersion or a mixture of several polymer dispersions. This can be, for example, ethylene / methacrylate, polyvinyl acetate, styrene-butadiene or the copolymers derived therefrom. Essential in this polymer dispersions is the fact that these components, which by itself only relatively low vapor densities of about 15 to 20 g / m 2/24 hours (at application rates of 20 g / m 2 dry weight) achieve particular in connection with the but is 4 reach primer according to the invention significantly higher barrier effects, up to 10 g / m 2 / 24h at a significantly reduced application amounts (5 to 10 g / m 2). The application quantity of the primer is between 2.5 and 5 g / m 2 depending on the nature of the base paper. A barrier effect according to DIN 53122 Klima D by the primer alone is not measurable (over 135 g / m 2 / 24h). However, the primer according to the invention almost completely prevents the migration of polymer dispersions into the paper or cardboard. This results in improved networking and thus a denser film build-up, as well as a reduction in the required application quantity (layer thickness).

Eine weitere Weiterbildung des Deckstriches in der Streichmasse schlägt vor, daß die Streichmasse des Deckstrichs ein mit Carnauba- und Paraffinwachs modifiziertes Copolymer von Styrol und Butadien, eine Ethylen/Methacrylsäure-Polymerdispersion sowie Polyvinylacetat enthält. Somit ist aus den genannten Grundstoffen zur Erzielung einer Dampfsperre ein entsprechend geeigneter Deckstrich zusammensetzbar. Dabei können Teilkombinationen aus diesen Komponenten gebildet werden. Gefordert ist lediglich, daß diese Kombination eine wirkungsvolle Dampfsperre erzielt.A further development of the top coat in the coating slip suggests that the Spread of the top coat a copolymer modified with carnauba and paraffin wax of styrene and butadiene, an ethylene / methacrylic acid polymer dispersion and polyvinyl acetate contains. Thus, from the basic materials mentioned to achieve a vapor barrier a suitable top coat can be put together. You can use partial combinations are formed from these components. The only requirement is that this combination achieved an effective vapor barrier.

Eine weitere Weiterbildung des Deckstriches in der Streichmasse schlägt vor, daß die Streichmasse des Deckstrichs ein mit Carnauba- und Paraffinwachs modifiziertes Copolymer von Styrol und Butadien oder eine Ethylen/Methacrylsäure-Polymerdispersion oder ein carboxyliertes Styrol-Butadien-Copolymer oder eine Styrol-Acrylat-Copolymerdispersion enthält. Mit diesen Kombinationen wird eine optimale Dampfsperre erzeugt, so daß in optimaler Weise der bereits zuvor geschilderte synergetische Effekt zusammen mit den speziellen Vorstrichen erzielt wird. Dabei können auch Kombinationen aus den genannten Stoffen gebildet sein.A further development of the top coat in the coating slip suggests that the Spread of the top coat a copolymer modified with carnauba and paraffin wax of styrene and butadiene or an ethylene / methacrylic acid polymer dispersion or a contains carboxylated styrene-butadiene copolymer or a styrene-acrylate copolymer dispersion. With these combinations, an optimal vapor barrier is created, so that in optimal Way the synergetic effect previously described together with the special Priming is achieved. Combinations of the substances mentioned can also be formed be.

Dabei kann der Deckstrich einen zusätzlichen Strich mit einer Streichmasse aus einer Styrol-Acrylat-Copolymerdispersion enthalten.The top coat can be an additional coat with a coating of a styrene-acrylate copolymer dispersion contain.

Eine Weiterbildung der Streichmasse des Deckstrichs schlägt vor, daß diese in einem flüssigen Lösungsmittel, insbesondere Wasser, gelöst ist. Die Komponenten der Streichmasse des Deckstrichs sind in ihrem Ursprungszustand, d.h. vor dem Auftrag insbesondere in Wasser gelöst und werden so aufgetragen.A further development of the coating slip of the top coat suggests that it is in a liquid Solvent, especially water, is dissolved. The components of the coating slip of the top line are in their original state, i.e. before the order especially in Dissolved water and are so applied.

Eine weitere Weiterbildung des Deckstriches schlägt vor, daß dem Deckstrich ein Polyvinylacetat beigemischt ist.A further development of the top coat suggests that the top coat be a polyvinyl acetate is added.

Die Auftragsmenge des Deckstriches beträgt vorzugweise 5 bis 10 g/m2. Diese Schichtdikke reicht bei den angegebenen Deckstrichen aus, um eine optimale Dampfsperre zu erzielen.The application quantity of the top coat is preferably 5 to 10 g / m 2 . With the specified top coats, this layer thickness is sufficient to achieve an optimal vapor barrier.

Weiterhin wird in einer Weiterbildung vorgeschlagen, daß der Auftrag des Vor- und Deckstriches mittels Rollrakel, Gravursystemen oder mittels Modifikationen davon erfolgt. Der Auftrag des Vor- und Deckstriches kann somit mittels bekannter Streichtechniken erzielt werden, die zur Erzielung von dünnen Streichschichten geeignet sind. Vorzugsweise werden dabei Maschinen mit zwei Streichwerken verwendet.Furthermore, it is proposed in a further development that the application of the primer and top coat by means of a doctor blade, engraving systems or modifications thereof. The order the primer and top coat can thus be achieved using known coating techniques, which are suitable for achieving thin coating layers. Preferably be used machines with two coaters.

Außerdem wird in einer Weiterbildung vorgeschlagen, daß das Papier oder der Karton beidseitig beschichtet ist. Die Beschichtungen können dabei selbstverständlich entsprechend den jeweiligen Erfordernissen auf den beiden Seiten unterschiedlich sein, wobei die verschiedensten Kombinationen der erfindungsgemäßen Vor- und Deckstriche denkbar sind.In addition, it is proposed in a further development that the paper or the cardboard is on both sides is coated. The coatings can of course accordingly the respective requirements on the two sides may be different, with the most varied Combinations of the primers and top coats according to the invention are conceivable.

Schließlich wird in einer Weiterbildung vorgeschlagen, daß das Papier oder der Karton oberflächengeleimt ist. Dadurch wird die Papier- oder Kartonoberfläche verdichtet und unterstützt somit die Wirkung des Vorstrichs.Finally, it is proposed in a further development that the paper or cardboard is surface-sized is. This compresses and supports the paper or cardboard surface hence the effect of the primer.

Ein Ausführungsbeispiel eines erfindungsgemäßen Papieres oder Kartons wird nachfolgend anhand der Zeichnung beschrieben. Diese zeigt in einer rein schematischen Darstellung eine Art Schnitt durch ein derartiges Papier oder Karton, welches zunächst mit einem Vorstrich und anschließend mit einem Deckstrich zur Schaffung einer Aroma- und Dampfsperre beschichtet worden ist.An embodiment of a paper or cardboard according to the invention is as follows described with reference to the drawing. This shows a in a purely schematic representation Kind of cut through such paper or cardboard, which first with a primer and then with a top coat to create an aroma and vapor barrier has been coated.

In der Zeichnung ist zunächst das Papier oder der Karton 1 in rein schematischer Weise zu erkennen. Es kann sich dabei beispielsweise auch um Recyclingpapier handeln.In the drawing, paper or cardboard 1 is initially closed in a purely schematic manner detect. It can also be recycled paper, for example.

Auf das Papier oder den Karton 1 ist ein Vorstrich 2 aufgetragen. Die chemische Zusammensetzung dieses Vorstrichs 2 ist zuvor beschrieben worden. Dabei ist in der Zeichnung erkennbar, daß der Vorstrich 2 fast vollständig in den Oberflächenbereich des Papiers oder Kartons 1 eindringt. Die spezielle Auswahl der einzelnen Komponenten in diesem Vorstrich 2 garantiert nach der Polymerisation eine Saturierung der kapillaren Faserstruktur des Substrats und überzieht diese mit einer amorphen Netzstruktur. Bei einer entsprechend abgestimmten Rheologie des auf den Vorstrich 2 anschließend aufgebrachten Deckstriches 3 reichen die im Vorstrich 2 verbleibenden Öffnungen zu einer guten Verankerung dieses Deckstriches 3 aus, wobei ein Wegschlagen wirksam unterbunden wird. So wird erreicht, daß die zu einer optimalen Polymerisation notwendigen wässrigen Bestandteile lange genug in der Deckstrichmasse bleiben und eine verbesserte Anordnung der filmbildenden Moleküle entsteht. Die so geschaffenen Papiere oder Kartons 1 verbessern die bislang nur unzureichend genutzten Eigenschaften dieser Deckstriche 3 erheblich und erzielen im Hinblick auf das Gesamtstrichgewicht mit herkömmlichen PE-Beschichtungen vergleichbare Barrierewerte. Der große Vorteil liegt dabei in der Rückführung der mit den beschriebenen Verfahren beschichteten Papier oder Kunststoffe 1 in den Wertstoffkreislauf. Diese Rückführung ist im Gegensatz zu PE-beschichteten Substraten wesentlich einfacher möglich und damit kostengünstiger. Weiterhin können durch die schon bei relativ geringen Auftragsgewichten realisierten hohen Sperrschichtwerte im Vergleich zu den bisherigen Beschichtungsverfahren Resourcen eingespart werden. Darüber hinaus ist es ohne weiteres möglich, auch Recyclingpapiere zu verwenden.A primer 2 is applied to the paper or cardboard 1. The chemical composition this primer 2 has been previously described. It is in the drawing recognizable that the primer 2 almost completely in the surface area of the paper or Cartons 1 penetrates. The special selection of the individual components in this primer 2 guarantees saturation of the capillary fiber structure of the substrate after the polymerization and covers them with one amorphous network structure. With a suitably coordinated rheology of the primer 2 subsequently applied top coat 3 the remaining in the primer 2 Openings for a good anchoring of this top coat 3, knocking away is effectively prevented. This ensures that the polymerization is optimal necessary aqueous components remain in the top coat mass long enough and an improved arrangement of the film-forming molecules arises. The so created Papers or boxes 1 improve the properties that have so far been underused these top coats 3 considerably and achieve with regard to the total coat weight Barrier values comparable to conventional PE coatings. The big advantage is here in the return of the paper or coated with the methods described Plastics 1 in the recycling cycle. This return is in contrast to PE-coated Substrates much easier and therefore cheaper. Farther can by the high junction values already realized with relatively low application weights resources saved compared to previous coating processes will. In addition, it is easily possible to use recycled paper.

In dem dargestellten Ausführungsbeispiel ist eine einseitige Beschichtung vorgesehen. Selbstverständlich ist es auch denkbar, sowohl die Vorder- als auch die Rückseite des Papiers oder Kartons 1 jeweils mit einer erfindungsgemäßen Beschichtung zu versehen. In the illustrated embodiment, a one-sided coating is provided. Of course, it is also conceivable for both the front and the back of the paper or boxes 1 are each provided with a coating according to the invention.

BezugszeichenlisteReference list

11
Papier oder KartonPaper or cardboard
22nd
VorstrichPrimer
33rd
DeckstrichTop line

Claims (17)

  1. Process for coating paper or cardboard (1) to create an aroma and vapour barrier,
    where first a primer coat (2) consisting of the components:
    liquid solvent, in particular water
    amorphous silicon dioxide
    aluminium oxide
    polyvinylalcohol
    a copolymer in which acrylic nitrate is copolymerized with styrene-butadiene
    and at least one further starch-free component
    is applied to the paper or cardboard (1), where the said coat covers the paper or cardboard (1) with an amorphous network structure by polymerization,
    and where subsequently a cover coat (3) is applied to this amorphous network structure of the primer coat (2).
  2. Process for coating paper or cardboard (1) to create an aroma and vapour barrier,
    where first a primer coat (2) consisting of the components:
    liquid solvent, in particular water
    silicic acid or precipitated silicic acid
    polyvinylalcohol
    a copolymer in which acrylic nitrate is copolymerized with styrene-butadiene
    and at least one further starch-free component
    is applied to the paper or cardboard (1), where the said coat covers the paper or cardboard (1) with an amorphous network structure by polymerization,
    and where subsequently a cover coat (3) is applied to this amorphous network structure of the primer coat (2).
  3. Process for coating paper or cardboard (1) to create an aroma and vapour barrier in accordance with claim 1,
    where first a primer coat (2) consisting of the components:
    liquid solvent, in particular water
    amorphous silicon dioxide
    aluminium oxide
    polyvinylalcohol
    a copolymer in which acrylic nitrate is copolymerized with styrene-butadiene
    and as further component(s) a defoaming agent and/or dispersant agent and/or retention agent
    is applied to the paper or cardboard (1), where the said coat covers the paper or cardboard (1) with an amorphous network structure by polymerization,
    and where subsequently a cover coat (3) is applied to this amorphous network structure of the primer coat (2).
  4. Process for coating paper or cardboard (1) to create an aroma and vapour barrier in accordance with claim 2,
    where first a primer coat (2) consisting of the components:
    liquid solvent, in particular water
    silicic acid or precipitated silicic acid
    polyvinylalcohol
    a copolymer in which acrylic nitrate is copolymerized with styrene-butadiene
    and as further component(s) a defoaming agent and/or dispersant agent and/or retention agent
    is applied to the paper or cardboard (1), where the said coat covers the paper or cardboard (1) with an amorphous network structure by polymerization,
    and where subsequently a cover coat (3) is applied to this amorphous network structure of the primer coat (2).
  5. Process according to claim 1 or 2,
    characterized in that
    as further component(s) for the application compound of the primer coat (2) a defoaming agent and/or dispersant agent and/or retention agent is(are) provided.
  6. Process according to claim 3 or 4,
    characterized in that
    the application compound of the primer coat (2) also contains starch.
  7. Process according to any of the previous claims,
    characterized in that
    the application quantity of the primer coat (2) is 2.5 to 5 g/m2.
  8. Process according to any of the previous claims,
    characterized in that
    the application compound of the cover coat (3) contains a polymer dispersion or a mixture of several polymer dispersions.
  9. Process according to any of the previous claims,
    characterized in that
    the application compound of the cover coat (3) contains a copolymer of styrene and butadiene modified with carnauba and paraffin wax, an ethylene/methacrylic acid polymer dispersion and polyvinyl acetate.
  10. Process according to any of the previous claims,
    characterized in that
    the application compound of the cover coat (3) contains
    a copolymer of styrene and butadiene modified with carnauba and paraffin wax
    or
    an ethylene/methacrylic acid polymer dispersion
    or
    carboxylated styrene-butadiene copolymer
    or
    a styrene acrylate copolymer dispersion.
  11. Process according to claim 10
    characterized in that
    the cover coat (3) contains an additional coating with an application compound of a styrene-acrylate-copolymer dispersion.
  12. Process according to any of claims 9 and 11
    characterized in that
    the application compound of the cover coat (3) is dissolved in a liquid solvent, in particular water.
  13. Process according to any of claims 10 and 12
    characterized in that
    a polyvinyl acetate is mixed into the cover coat (3).
  14. Process according to any of the previous claims
    characterized in that
    the application quantity of the cover coat (3) is 5 to 10 g/m2.
  15. Process according to any of the previous claims
    characterized in that
    the primer and cover coat (2, 3) are applied by means of roller blades, gravure systems or modifications thereof.
  16. Process according to any of the previous claims
    characterized in that
    the paper or cardboard (1) is coated on both sides.
  17. Process according to any of the previous claims
    characterized in that
    the paper or cardboard (1) is sized on the surface.
EP95114103A 1995-09-08 1995-09-08 Coating method for paper or cardboard Expired - Lifetime EP0761876B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP95114103A EP0761876B1 (en) 1995-09-08 1995-09-08 Coating method for paper or cardboard
DE59501382T DE59501382D1 (en) 1995-09-08 1995-09-08 Process for coating paper or cardboard
ES95114103T ES2114255T3 (en) 1995-09-08 1995-09-08 PROCEDURE FOR THE COATING OF PAPER OR CARDBOARD.
AT95114103T ATE162866T1 (en) 1995-09-08 1995-09-08 METHOD FOR COATING PAPER OR CARDBOARD

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP95114103A EP0761876B1 (en) 1995-09-08 1995-09-08 Coating method for paper or cardboard

Publications (2)

Publication Number Publication Date
EP0761876A1 EP0761876A1 (en) 1997-03-12
EP0761876B1 true EP0761876B1 (en) 1998-01-28

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Application Number Title Priority Date Filing Date
EP95114103A Expired - Lifetime EP0761876B1 (en) 1995-09-08 1995-09-08 Coating method for paper or cardboard

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EP (1) EP0761876B1 (en)
AT (1) ATE162866T1 (en)
DE (1) DE59501382D1 (en)
ES (1) ES2114255T3 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN109667192A (en) * 2019-01-18 2019-04-23 上海海洋大学 A kind of heat-insulation and heat-preservation wrapping paper and preparation method thereof

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DE10103065A1 (en) * 2001-01-24 2002-07-25 Basf Ag Production of barrier coatings on paper and cardboard, e.g. for water vapor-impermeable food packaging, uses an aqueous dispersions of hydrogenated styrene-butadiene copolymers
SE520187C2 (en) 2001-10-09 2003-06-10 Tetra Laval Holdings & Finance Laminated packaging material, method of preparation and packaging container made of the packaging material
ITRM20050630A1 (en) * 2005-12-15 2007-06-16 Policarta Srl PACKAGE FOR OVEN AND SIMILAR FOOD PRODUCTS.
DE102011000189A1 (en) * 2011-01-17 2012-07-19 Vg Nicolaus Gmbh & Co. Kg Packaging made of cardboard
FR3024467B1 (en) 2014-07-30 2019-05-17 Munksjö Oyj THERMOSCELLANT BARRIER PAPER
FR3024468B1 (en) 2014-07-30 2019-05-17 Munksjö Oyj METHOD FOR MANUFACTURING THERMOSCELLANT BARRIER PAPER

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IT1227595B (en) 1988-12-14 1991-04-22 Cartiere Saffa S P A PROCEDURE FOR THE PRODUCTION OF COATED PAPERS AND CARDBOARDS WITH WATER VAPOR MIGRATION PROPERTIES AND RELATED PRODUCTS
EP0393451A1 (en) 1989-04-19 1990-10-24 Neusiedler Aktiengesellschaft Process for the treatment of paper or cardboard to increase the impermeability towards water vapour and flavours, thus treated paper and cardboard as well as a coating agent
DE4227184C2 (en) 1992-08-17 1997-09-25 Dresden Papier Ag Impregnation agent for the production of papers with high penetration resistance against fats, oils and aqueous media and process for its production
US5763100A (en) * 1993-05-10 1998-06-09 International Paper Company Recyclable acrylic coated paper stocks and related methods of manufacture
DE4335247A1 (en) * 1993-10-15 1995-06-22 Gruber & Weber Gmbh Co Kg Impregnation process and polymer-based medium for packaging materials
DE4407878C2 (en) * 1994-03-09 1996-07-04 Bernhard Dettling Aroma and vapor barrier coated paper or cardboard

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109667192A (en) * 2019-01-18 2019-04-23 上海海洋大学 A kind of heat-insulation and heat-preservation wrapping paper and preparation method thereof
CN109667192B (en) * 2019-01-18 2021-09-28 上海海洋大学 Heat insulation packaging paper and preparation method thereof

Also Published As

Publication number Publication date
DE59501382D1 (en) 1998-03-05
EP0761876A1 (en) 1997-03-12
ES2114255T3 (en) 1998-05-16
ATE162866T1 (en) 1998-02-15

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