EP0676502A1 - Process for making cardboard - Google Patents

Process for making cardboard Download PDF

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Publication number
EP0676502A1
EP0676502A1 EP95104692A EP95104692A EP0676502A1 EP 0676502 A1 EP0676502 A1 EP 0676502A1 EP 95104692 A EP95104692 A EP 95104692A EP 95104692 A EP95104692 A EP 95104692A EP 0676502 A1 EP0676502 A1 EP 0676502A1
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EP
European Patent Office
Prior art keywords
fiber suspension
layer
produce
base layer
cover layer
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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.)
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EP95104692A
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German (de)
French (fr)
Inventor
Alfred Pospisek
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Kartonfabrik Niedergosgen AG
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Kartonfabrik Niedergosgen AG
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Publication of EP0676502A1 publication Critical patent/EP0676502A1/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/06—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the cylinder type
    • D21F11/08—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the cylinder type paper or board consisting of two or more layers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
    • D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers

Definitions

  • the invention relates to a process for the production of cardboard according to the preamble of claim 1. It has long been known to produce marbled or flamed cardboard, which is used increasingly because of its aesthetic quality, above all as packaging material, on four-wire systems by first producing a mostly gray or brown base layer of fiber suspension with a dry matter content of approx. 10% (weight) is applied to a sieve belt and then another thin layer of fiber suspension of about the same dry matter content is placed on top to produce a whitish top layer and then gassed with the base layer. In this way, a cardboard box with an irregularly open or translucent cover layer is created, which, due to the different colored base layer, gives the impression of flaming or marbling.
  • the invention is intended to remedy this.
  • the invention as characterized in the claims, creates a process for the production of marbled cardboard, which is characterized by a flat surface. It is therefore pleasant to hold and, above all, can be easily printed. Printed characters and writing appear closed and with clear boundary lines, so that there is an ongoing visual impression.
  • the system comprises (FIG. 1) an endless felt cloth 1, which runs over round formers 2a - 2f of a type known per se.
  • the round formers 2a-2d serve to apply fiber suspension to form a four-layer base layer, which is pumped to the same via lines 3a-3d.
  • the round former 2e also serves to apply fiber suspension to form a cover layer on the base layer, which is fed to it through the line 3e.
  • a line 3f also leads to the last round former 2f, but is not used in the method according to the invention.
  • the round formers 2a-2f have sieve drums 4a-4f in housings (not shown) and feed devices 5a-5f, into which the lines 3a-3f open. Slightly offset in the felt running direction are rubber rollers 6a-6f, which press the felt cloth 1, including the layers applied, against the respective screening drum. Before the first round former 2a and after the last round former 2f, the felt cloth 1 is passed over deflection rollers 7 and 8, respectively.
  • the sieve drum 4e of the round former 2e (FIG. 2; the other round formers 2a-2d and 2f are constructed in exactly the same way) has four zones A - D separated from one another by indicated intermediate walls 9 reaching up to the sieve drum 4e to which vacuum can be applied in an independently controllable manner via corresponding suction lines (not shown).
  • the feed device 5e has a fabric box 10e with a feed channel 11e, which connects to the line 3e. Its lower part is formed by a lower lip 12e and its upper part by an upper lip 13e, both of which are adjustable for regulating the exit speed and the exit angle.
  • layers are applied in succession to the round formers 2a-2c, in that fiber suspension of the same type is fed through the lines 3a-3c.
  • the dry matter content is approx. 6% (weight).
  • the quality of the raw materials does not play a major role, cellulose, but also waste paper can be used without further ado.
  • the fourth layer, which is applied to the round former 2d, can also be produced from the same fiber suspension as the first three layers. However, dye can be added to the fiber suspension here.
  • a vacuum of 0.5 bar is applied to each of the zones A and D of the sieve drums 4a-4d, and a pressure of 1.5 bar is applied to the zones B and C.
  • a pressure of 1.5 bar is applied to the zones B and C.
  • the fiber suspension is sucked onto the sieve drum so that, in contrast to what is shown in FIG. 2, it also follows it in zone C until it reaches the felt cloth 1 or the layers already applied to it.
  • the last layer applied is then gassed with the layers previously applied by means of the corresponding rubber roller.
  • the layers applied to the round formers 2a-2d form the base layer 14.
  • fiber suspension is also applied to the round former 2e, but has a significantly lower dry matter content than the layers applied to form the base layer 14. It is preferably between 0.7% (weight) and 1.5% (weight) - values around 1.2% (weight) have proven particularly useful - but in any case less than 2% (weight), while the dry matter content of the Base layer 14 at this point is approximately 8% (weight).
  • no negative pressure is applied to the sieve drum 4e of the round former 2e, so that the fiber suspension is sprayed onto the base layer 14 at an acute angle with the direction of the felt or is injected into it and thereby closely connects to it.
  • the injection speed is generally between 1.0 m / sec and 1.8 m / sec and preferably 1.5 m / sec, the injection angle between 15 ° and 40 °, preferably 30 °.
  • the fiber suspensions can have approximately the same freeness. However, the degree of grinding of the fiber suspension for the cover layer 15 is preferably somewhat lower.
  • the felt cloth 1 with base layer 14 and cover layer 15 is passed over the round former 2f, but where no fiber suspension is applied.
  • negative pressure is applied to the sieve drum 4f.
  • the round former 2f thus works as a drainage unit.
  • the felt cloth 1 with the layers applied runs through a suction press, then the cardboard is separated from the felt cloth, passed through presses and drying groups and rolled up on a reel (not shown).
  • the close connection between the base layer and the top layer gives the box a flat surface that is easy to print on.

Abstract

In the prodn. of a marbled cardboard, for packaging, the covering layer (15) is an applied fibre suspension with a max. 2 wt.% dry material. Pref. the fibre suspension for the outer covering (15) has pref. 0.7-1.5 wt.% of dry material. The final carrier layer (14) of the cardboard, at least, has a fibre suspension which, at the application point of the covering layer (15), contains 6-10 wt.% of dry material or about 8 wt.%, together with a dye. The suspension for the covering layer (15) is sprayed on at an acute angle to the direction of the blanket (1) travel, at 15-40 degrees . The fibre suspension spray speed is 1.0-1.8 m/sec. The blanket (1) travels over a number of perforated drums, in succession, at round paper development stages. A fibre suspension for the carrier layer (14) is delivered at least at one stage, and the perforated drums apply suction for water extraction. The covering layer (15) suspension is applied at a following stage where there is no underpressure action. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von Karton gemäss dem Oberbegriff des Anspruchs 1. Es ist seit längerem bekannt, marmorierten oder geflammten Karton, der wegen seiner ästhetischen Qualität vor allem als Verpackungsmaterial zunehmend Verwendung findet, auf Langsiebanlagen herzustellen, indem erst zur Herstellung einer meist grauen oder braunen Tragschicht Fasersuspension mit einem Trockenstoffgehalt von ca. 10% (Gewicht) auf ein Siebband aufgebracht und anschliessend zur Herstellung einer weisslichen Deckschicht eine weitere, dünne Schicht Fasersuspension von etwa dem gleichen Trockenstoffgehalt aufgelegt und anschliessend mit der Tragschicht vergautscht wird. Auf diese Weise entsteht ein Karton mit einer unregelmässig durchbrochenen oder durchscheinenden Deckschicht, was wegen der andersfarbigen Tragschicht optisch den Eindruck einer Flammung oder Marmorierung hervorruft.The invention relates to a process for the production of cardboard according to the preamble of claim 1. It has long been known to produce marbled or flamed cardboard, which is used increasingly because of its aesthetic quality, above all as packaging material, on four-wire systems by first producing a mostly gray or brown base layer of fiber suspension with a dry matter content of approx. 10% (weight) is applied to a sieve belt and then another thin layer of fiber suspension of about the same dry matter content is placed on top to produce a whitish top layer and then gassed with the base layer. In this way, a cardboard box with an irregularly open or translucent cover layer is created, which, due to the different colored base layer, gives the impression of flaming or marbling.

Derartige Kartons haben jedoch den Nachteil, dass die ungleichmässige Deckschicht trotz der Vergautschung eine unebene Oberfläche bildet, was mit einigen Nachteilen verbunden ist. Insbesondere sind unebene Flächen nicht sauber bedruckbar. Dies beeinträchigt den optischen Eindruck der oft für Kennzeichnungs- und - insbesondere an Verpackungen - für Werbezwecke angebrachten Aufdrucke.However, such cartons have the disadvantage that the uneven cover layer forms an uneven surface despite the gouging, which has some disadvantages. In particular, uneven surfaces cannot be printed cleanly. This detracts from the visual impression of the imprints that are often used for labeling and - in particular on packaging - for advertising purposes.

Hier soll die Erfindung Abhilfe schaffen. Die Erfindung, wie sie in den Ansprüchen gekennzeichnet ist, schafft ein Verfahren zur Herstellung von marmoriertem Karton, der sich durch eine ebene Oberfläche auszeichnet. Er ist dadurch angenehm im Griff und vor allem problemlos bedruckbar. Aufgedruckte Zeichen und Schrift erscheinen geschlossen und mit klaren Grenzlinien, so dass sich ein tadelloser optischer Eindruck ergibt.The invention is intended to remedy this. The invention, as characterized in the claims, creates a process for the production of marbled cardboard, which is characterized by a flat surface. It is therefore pleasant to hold and, above all, can be easily printed. Printed characters and writing appear closed and with clear boundary lines, so that there is an impeccable visual impression.

Im folgenden wird die Erfindung anhand von Figuren, welche lediglich ein Ausführungsbeispiel betreffen, näher erläutert. Es zeigen

Fig. 1
schematisch eine Anlage zur Herstellung von erfindungsgemässem Karton und
Fig. 2
vergrössert einen Ausschnitt aus Fig. 1.
The invention is explained in more detail below with reference to figures which relate only to one exemplary embodiment. Show it
Fig. 1
schematically a plant for the production of cardboard according to the invention and
Fig. 2
enlarges a detail from FIG. 1.

Die Anlage umfasst (Fig. 1) ein endloses Filztuch 1, welches über Rundformer 2a - 2f an sich bekannter Bauart läuft. Die Rundformer 2a - 2d dienen dazu, Fasersuspension zur Bildung einer vierlagigen Tragschicht aufzubringen, die über Leitungen 3a - 3d zu denselben gepumpt wird. Der Rundformer 2e dient dazu, zur Bildung einer Deckschicht auf der Tragschicht ebenfalls Fasersuspension aufzubringen, die ihm durch die Leitung 3e zugeführt wird. Zum letzten Rundformer 2f führt zwar ebenfalls eine Leitung 3f, die jedoch beim erfindungsgemässen Verfahren nicht benutzt wird.The system comprises (FIG. 1) an endless felt cloth 1, which runs over round formers 2a - 2f of a type known per se. The round formers 2a-2d serve to apply fiber suspension to form a four-layer base layer, which is pumped to the same via lines 3a-3d. The round former 2e also serves to apply fiber suspension to form a cover layer on the base layer, which is fed to it through the line 3e. A line 3f also leads to the last round former 2f, but is not used in the method according to the invention.

Die Rundformer 2a - 2f weisen in (nicht dargestellten) Gehäusen Siebtrommeln 4a - 4f auf sowie Zuführeinrichtungen 5a - 5f, in welche die Leitungen 3a - 3f münden. In Filzlaufrichtung jeweils leicht versetzt sind Gautschwalzen 6a - 6f angebracht, welche das Filztuch 1 einschliesslich aufgebrachter Lagen gegen die jeweilige Siebtrommel pressen. Vor dem ersten Rundformer 2a und nach dem letzten Rundformer 2f wird das Filztuch 1 über Umlenkrollen 7 bzw. 8 geleitet.The round formers 2a-2f have sieve drums 4a-4f in housings (not shown) and feed devices 5a-5f, into which the lines 3a-3f open. Slightly offset in the felt running direction are rubber rollers 6a-6f, which press the felt cloth 1, including the layers applied, against the respective screening drum. Before the first round former 2a and after the last round former 2f, the felt cloth 1 is passed over deflection rollers 7 and 8, respectively.

Die Siebtrommel 4e des Rundformers 2e (Fig. 2; die übrigen Rundformer 2a - 2d und 2f sind genau gleich aufgebaut) weist vier durch angedeutete bis zur Siebtrommel 4e reichende Zwischenwände 9 voneinander getrennte Zonen A - D auf, an welchen über entsprechende Absaugleitungen (nicht dargestellt) in unabhängig regelbarer Weise Unterdruck angelegt werden kann. Die Zuführeinrichtung 5e weist einen Stoffkasten 10e mit einem Zuführkanal 11e auf, der an die Leitung 3e anschliesst. Sein unterer Teil wird durch eine Unterlippe 12e gebildet und sein oberer Teil durch eine Oberlippe 13e, welche beide zur Regelung der Austrittsgeschwindigkeit und des Austrittswinkels verstellbar sind.The sieve drum 4e of the round former 2e (FIG. 2; the other round formers 2a-2d and 2f are constructed in exactly the same way) has four zones A - D separated from one another by indicated intermediate walls 9 reaching up to the sieve drum 4e to which vacuum can be applied in an independently controllable manner via corresponding suction lines (not shown). The feed device 5e has a fabric box 10e with a feed channel 11e, which connects to the line 3e. Its lower part is formed by a lower lip 12e and its upper part by an upper lip 13e, both of which are adjustable for regulating the exit speed and the exit angle.

Zur erfindungsgemässen Kartonherstellung werden an den Rundformern 2a - 2c nacheinander Lagen aufgetragen, indem durch die Leitungen 3a - 3c Fasersuspension jeweils gleicher Art zugeführt wird. Der Trockenstoffgehalt liegt jeweils bei ca. 6% (Gewicht). Die Qualität der Ausgangsmaterialien spielt dabei keine grosse Rolle, es kann Zellstoff, aber ohne weiteres auch Altpapier verwendet werden. Auch die vierte Lage, die am Rundformer 2d aufgebracht wird, kann aus gleicher Fasersuspension wie die ersten drei Lagen hergestellt werden. Der Fasersuspension kann hier jedoch Farbstoff zugegeben sein.For the production of cardboard according to the invention, layers are applied in succession to the round formers 2a-2c, in that fiber suspension of the same type is fed through the lines 3a-3c. The dry matter content is approx. 6% (weight). The quality of the raw materials does not play a major role, cellulose, but also waste paper can be used without further ado. The fourth layer, which is applied to the round former 2d, can also be produced from the same fiber suspension as the first three layers. However, dye can be added to the fiber suspension here.

An den Zonen A und D der Siebtrommeln 4a - 4d wird jeweils ein Unterdruck von 0,5 bar angelegt, an den Zonen B und C ein solcher von 1,5 bar. Dadurch wird jeweils Wasser durch die Siebtrommel abgesaugt und der Trockenstoffgehalt der Fasersuspension erhöht. Ausserdem wird die Fasersuspension an die Siebtrommel angesaugt, so dass sie derselben - im Gegensatz zum in Fig. 2 Gezeigten - auch in der Zone C folgt, bis sie das Filztuch 1 oder die bereits auf dasselbe aufgebrachten Lagen erreicht. Anschliessend wird die zuletzt aufgebrachte Lage jeweils mittels der entsprechenden Gautschwalze mit den zuvor aufgebrachten Lagen vergautscht. Die an den Rundformern 2a - 2d aufgebrachten Lagen bilden die Tragschicht 14.A vacuum of 0.5 bar is applied to each of the zones A and D of the sieve drums 4a-4d, and a pressure of 1.5 bar is applied to the zones B and C. As a result, water is drawn off through the sieve drum and the dry matter content of the fiber suspension is increased. In addition, the fiber suspension is sucked onto the sieve drum so that, in contrast to what is shown in FIG. 2, it also follows it in zone C until it reaches the felt cloth 1 or the layers already applied to it. The last layer applied is then gassed with the layers previously applied by means of the corresponding rubber roller. The layers applied to the round formers 2a-2d form the base layer 14.

Am Rundformer 2e wird zur Herstellung der Deckschicht 15 auf der Tragschicht 14 ebenfalls Fasersuspension aufgebracht, die jedoch wesentlich weniger Trockenstoffgehalt aufweist als die zur Bildung der Tragschicht 14 aufgebrachten Lagen. Er liegt vorzugsweise zwischen 0,7% (Gewicht) und 1,5% (Gewicht) - besonders bewährt haben sich Werte um 1,2% (Gewicht) -, in jedem Fall aber unter 2% (Gewicht), während der Trockenstoffgehalt der Tragschicht 14 an dieser Stelle bei ca. 8% (Gewicht) liegt. Ausserdem wird an der Siebtrommel 4e des Rundformers 2e kein Unterdruck angelegt, so dass die Fasersupension hier in spitzem Winkel mit der Filzlaufrichtung auf die Tragschicht 14 aufgespritzt oder in sie eingespritzt wird und sich dadurch eng mit ihr verbindet. Die Einspritzgeschwindigkeit liegt dabei im allgemeinen zwischen 1,0 m/sec und 1,8 m/sec und vorzugsweise bei 1,5 m/sec, der Einspritzwinkel zwischen 15° und 40°, vorzugsweise bei 30°. Es entsteht so eine stellenweise durchbrochene oder mindestens durchscheinende Deckschicht 15, welche zwecks Herstellung einer spaltfesten Verbindung zwischen den Schichten mittels der Gautschwalze 6e mit der Tragschicht 14 vergautscht wird. Die Fasersuspensionen können etwa gleichen Mahlgrad aufweisen. Vorzugsweise liegt jedoch der Mahlgrad der Fasersuspension für die Deckschicht 15 etwas tiefer.In order to produce the cover layer 15 on the base layer 14, fiber suspension is also applied to the round former 2e, but has a significantly lower dry matter content than the layers applied to form the base layer 14. It is preferably between 0.7% (weight) and 1.5% (weight) - values around 1.2% (weight) have proven particularly useful - but in any case less than 2% (weight), while the dry matter content of the Base layer 14 at this point is approximately 8% (weight). In addition, no negative pressure is applied to the sieve drum 4e of the round former 2e, so that the fiber suspension is sprayed onto the base layer 14 at an acute angle with the direction of the felt or is injected into it and thereby closely connects to it. The injection speed is generally between 1.0 m / sec and 1.8 m / sec and preferably 1.5 m / sec, the injection angle between 15 ° and 40 °, preferably 30 °. This results in a cover layer 15 which is partially open or at least translucent and which is gassed with the support layer 14 by means of the rubber roller 6e in order to produce a gap-proof connection between the layers. The fiber suspensions can have approximately the same freeness. However, the degree of grinding of the fiber suspension for the cover layer 15 is preferably somewhat lower.

Schliesslich wird das Filztuch 1 mit Tragschicht 14 und Deckschicht 15 über den Rundformer 2f geleitet, wo jedoch keine Fasersuspension aufgebracht wird. Allerdings liegt an der Siebtrommel 4f ähnlich wie an den Siebtrommeln 4a - 4d der vier ersten Rundformer 2a - 2d zum Entzug von Wasser Unterdruck an. Der Rundformer 2f arbeitet also als Entwässerungseinheit. Im weiteren läuft das Filztuch 1 mit den aufgebrachten Lagen durch eine Saugpresse, anschliessend wird der Karton vom Filztuch getrennt, durch Pressen und Trockengruppen geleitet und auf einem Tambour aufgerollt (nicht dargestellt).Finally, the felt cloth 1 with base layer 14 and cover layer 15 is passed over the round former 2f, but where no fiber suspension is applied. However, similar to the sieve drums 4a - 4d of the four first round formers 2a - 2d, negative pressure is applied to the sieve drum 4f. The round former 2f thus works as a drainage unit. Furthermore, the felt cloth 1 with the layers applied runs through a suction press, then the cardboard is separated from the felt cloth, passed through presses and drying groups and rolled up on a reel (not shown).

Durch die enge Verbindung zwischen Tragschicht und Deckschicht erhält der Karton eine ebene Oberfläche, welche sich gut bedrucken lässt. Durch entsprechende Einfärbung der obersten Lage der Tragschicht 14 und eventuell auch der Deckschicht 15 lassen sich viele durch spezifische Effekte gut unterscheidbare Typen von optisch attraktivem Karton herstellen.The close connection between the base layer and the top layer gives the box a flat surface that is easy to print on. By appropriately coloring the top layer of the base layer 14 and possibly also the cover layer 15, many types of optically attractive cardboard that can be easily distinguished by specific effects can be produced.

Die Herstellung erfindungsgemässen Kartons auf einer Anlage mit Rundformern ist nicht zwingend. Er kann auch auf einer Langsiebanlage hergestellt werden. Entscheidend ist vor allem der tiefe Trockenstoffgehalt der zur Bildung der Deckschicht aufgebrachten Fasersuspension. In zweiter Linie sind auch der Trockenstoffgehalt der Tragschicht am Ort des Aufbringens besagter Fasersuspension sowie die Art des Aufbringens derselben - durch Aufspritzen - von Bedeutung für die Qualität des Kartons.The production of cartons according to the invention on a system with round formers is not mandatory. It can also be produced on a four-wire system. The decisive factor is above all the low dry matter content of the fiber suspension applied to form the top layer. Secondly, the dry matter content of the base layer at the point at which said fiber suspension is applied and the type of application thereof - by spraying - are important for the quality of the cardboard.

Claims (10)

Verfahren zur Herstellung eines marmorierten Kartons, bei welchem zur Herstellung einer Tragschicht (14) mindestens eine Lage Fasersuspension auf ein laufendes Filztuch (1) aufgebracht und anschliessend zur Herstellung einer durchbrochenen Deckschicht (15) auf der Tragschicht (14) eine weitere Lage Fasersuspension aufgebracht wird, worauf Tragschicht (14) und Deckschicht (15) vergautscht werden, dadurch gekennzeichnet, dass die zur Herstellung der Deckschicht (15) aufgebrachte Fasersuspension höchstens 2% (Gewicht) Trockensubstanz enthält.Method for producing a marbled cardboard, in which at least one layer of fiber suspension is applied to a running felt cloth (1) in order to produce a base layer (14) and then a further layer of fiber suspension is applied to the base layer (14) to produce a perforated cover layer (15) , whereupon the base layer (14) and cover layer (15) are littered, characterized in that the fiber suspension applied to produce the cover layer (15) contains at most 2% (weight) of dry substance. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die zur Herstellung der Deckschicht aufgebrachte Fasersuspension zwischen zwischen 0,7% (Gewicht) und 1,5% (Gewicht) Trockensubstanz enthält.A method according to claim 1, characterized in that the fiber suspension applied to produce the cover layer contains between 0.7% (weight) and 1.5% (weight) of dry substance. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass mindestens die zuletzt zur Herstellung der Tragschicht (14) aufgebrachte Fasersuspension am Ort der Aufbringung der Fasersuspension zur Herstellung der Deckschicht (15) zwischen 6% (Gewicht) und 10% (Gewicht) Trockensubstanz enthält.Method according to claim 1 or 2, characterized in that at least the fiber suspension applied last for the production of the base layer (14) at the place of application of the fiber suspension for the production of the cover layer (15) contains between 6% (weight) and 10% (weight) dry substance . Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass mindestens die zuletzt zur Herstellung der Tragschicht (14) aufgebrachte Fasersuspension am Ort der Aufbringung der Fasersuspension zur Herstellung der Deckschicht (15) ca. 8% (Gewicht) Trockensubstanz enthält.A method according to claim 3, characterized in that at least the fiber suspension last applied for the production of the base layer (14) at the location of the application of the fiber suspension for the production of the top layer (15) contains approximately 8% (weight) of dry substance. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der zuletzt zur Herstellung der Tragschicht (14) aufgebrachten Fasersuspension Farbstoff beigegeben ist.Method according to one of claims 1 to 4, characterized in that the last to produce the Base layer (14) applied fiber suspension dye is added. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die zur Herstellung der Deckschicht (15) aufgebrachte Fasersuspension in einer Richtung, die mit der Laufrichtung des Filztuches (1) einen spitzen Winkel einschliesst, aufgespritzt wird.Method according to one of claims 1 to 5, characterized in that the fiber suspension applied to produce the cover layer (15) is sprayed on in a direction which includes an acute angle with the running direction of the felt cloth (1). Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass der spitze Winkel zwischen 15° und 40° beträgt.A method according to claim 6, characterized in that the acute angle is between 15 ° and 40 °. Verfahren nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass die Geschwindigkeit, mit der die Fasersuspension aufgespritzt wird, zwischen 1,0 m/sec und 1,8 m/sec beträgt.A method according to claim 6 or 7, characterized in that the speed at which the fiber suspension is sprayed on is between 1.0 m / sec and 1.8 m / sec. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass das Filztuch (1) über Siebtrommeln (4a - 4f) hintereinander angeordneter Rundformer (2a - 2f) läuft, an mindestens einem Rundformer (2a - 2d) Fasersuspension zur Herstellung der Tragschicht (14) aufgebracht wird, wobei jeweils durch über die Siebtrommel (4a - 4d) einwirkenden Unterdruck in der Aufbringzone Wasser aus der Fasersuspension abgesaugt wird und an einem weiteren Rundformer (2e), ohne Einwirkung von Unterdruck auf dieselbe, Fasersuspension zur Herstellung der Deckschicht (15) aufgebracht wird.Method according to one of Claims 1 to 8, characterized in that the felt cloth (1) runs over sieve drums (4a - 4f) round formers (2a - 2f) arranged one behind the other, on at least one round former (2a - 2d) fiber suspension for producing the base layer ( 14) is applied, water being sucked out of the fiber suspension in the application zone by vacuum acting in each case through the screen drum (4a - 4d) and fiber suspension for producing the cover layer (15 ) is applied. Verfahren nach Anspruch 9, dadurch gekennzeichnet, dass auf den Rundformer (2e), durch den Fasersuspension zur Herstellung der Deckschicht (15) aufgebracht wird, ein Rundformer (2f) folgt, an welchem keine Fasersuspension aufgebracht wird, über dessen Siebtrommel (4f) jedoch Unterdruck auf die an den vorher durchlaufenen Rundformern (4a - 4e) aufgebrachten Lagen einwirkt.Method according to claim 9, characterized in that a round former (2f) follows the round former (2e) through which fiber suspension is applied to produce the cover layer (15), to which no fiber suspension is applied, but via its sieve drum (4f) Negative pressure acts on the layers applied to the previously passed round formers (4a - 4e).
EP95104692A 1994-04-05 1995-03-30 Process for making cardboard Withdrawn EP0676502A1 (en)

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CH100494 1994-04-05
CH1004/94 1994-04-05

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN102423974A (en) * 2011-10-10 2012-04-25 石家庄中晟安全印刷有限公司 Compound ticket card production process

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Publication number Priority date Publication date Assignee Title
DE455729C (en) * 1928-02-07 F H Banning & Seybold Maschb G Equipment for the production of cardboard and multiple papers on cylinder molds
US2143840A (en) * 1936-02-05 1939-01-17 Waldorf Paper Prod Co Paper stock
US3138518A (en) * 1961-07-13 1964-06-23 Columbia Box Board Mills Inc Method of making striated paperbpoard
DE2604976A1 (en) * 1975-02-13 1976-08-26 Slovenskej Vysokej Skoly METHOD AND DEVICE FOR MANUFACTURING SINGLE AND MULTI-LAYER SHEETS OR PANELS FROM FIBER SUSPENSIONS
WO1985005387A1 (en) * 1984-05-11 1985-12-05 A. Ahlström Corporation Method for manufacturing multilayer board

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE455729C (en) * 1928-02-07 F H Banning & Seybold Maschb G Equipment for the production of cardboard and multiple papers on cylinder molds
US2143840A (en) * 1936-02-05 1939-01-17 Waldorf Paper Prod Co Paper stock
US3138518A (en) * 1961-07-13 1964-06-23 Columbia Box Board Mills Inc Method of making striated paperbpoard
DE2604976A1 (en) * 1975-02-13 1976-08-26 Slovenskej Vysokej Skoly METHOD AND DEVICE FOR MANUFACTURING SINGLE AND MULTI-LAYER SHEETS OR PANELS FROM FIBER SUSPENSIONS
WO1985005387A1 (en) * 1984-05-11 1985-12-05 A. Ahlström Corporation Method for manufacturing multilayer board

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102423974A (en) * 2011-10-10 2012-04-25 石家庄中晟安全印刷有限公司 Compound ticket card production process
CN102423974B (en) * 2011-10-10 2013-07-17 石家庄中晟安全印刷有限公司 Compound ticket card production process

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