EP1005965A1 - Process for preparing a workpiece from cellulose fibers, as well as process for the manufacture of paper or sheets made of cellulose fibers - Google Patents

Process for preparing a workpiece from cellulose fibers, as well as process for the manufacture of paper or sheets made of cellulose fibers Download PDF

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Publication number
EP1005965A1
EP1005965A1 EP99890353A EP99890353A EP1005965A1 EP 1005965 A1 EP1005965 A1 EP 1005965A1 EP 99890353 A EP99890353 A EP 99890353A EP 99890353 A EP99890353 A EP 99890353A EP 1005965 A1 EP1005965 A1 EP 1005965A1
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European Patent Office
Prior art keywords
brush
fibers
cellulose fibers
binder
paper
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EP99890353A
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German (de)
French (fr)
Inventor
Fritz Samek
Erdal Güclüerler
Sean Mcguire
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27NMANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00Pretreatment of moulding material
    • B27N1/02Mixing the material with binding agent
    • B27N1/0227Mixing the material with binding agent using rotating stirrers, e.g. the agent being fed through the shaft of the stirrer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27NMANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00Pretreatment of moulding material

Definitions

  • the present invention relates to a method for manufacturing a molded body made of cellulose fibers, in which moist cellulose fibers mixed with a binder are introduced into a mold, in particular blown in are and pressed there, after which the molded body is heated becomes. It also relates to a manufacturing process of paper or sheets of cellulose fibers, in which moist cellulose fibers mixed with a binder are applied to a conveyor belt, in particular blown and there by another conveyor belt that is above of the first conveyor belt is running, pressed together.
  • a process for producing a molded article from cellulose fibers is known from EP 257 106 A1.
  • the fibers can manufactured in accordance with this laid-open specification that cellulose-containing particles with steam, hot water or weak alkali open minded and in defibrators frayed and then dried. These fibers are glued and blown into a press mold, where they are then be compressed. If necessary, the molded body is then removed from this press, inserted in a second press and pressed there with the supply of heat.
  • On Process for the production of paper or plates from cellulose fibers The type mentioned at the outset is from WO 89/11385 A known. According to this disclosure, a Fiber / air suspension blown into a gap separated by two conveyor belts arranged one above the other is formed.
  • a disadvantage of these known methods is that the Production of loose fibers from an aqueous suspension done according to the known methods by heating, that is is correspondingly energy-intensive.
  • the invention is based on the surprising finding Reason that the cellulose fibers are not absolutely dry must be or have very little moisture allowed to; the moisture that is present in the mechanical Dewatering results (about 30-70%) is still perfectly acceptable. Centrifuges can be used for mechanical dewatering, however, the fibers can also be pressed.
  • the fibers are then placed in a tube in which a brush rotates very quickly, e.g. With 10,000 to 20,000 revolutions per minute. This will make the Ball of fiber is broken down even further, and the binder becomes equally distributed. The volume increases again.
  • the brush acts like a centrifugal pump. It not only cuts the fibers, but also promotes them they also continue, expediently straight into the mold.
  • the material is pressed there. In contrast to the fiber casting process the material does not need to be dried in the mold. Although it is only mechanically drained, the result is how in the known dry processes only by pressing already a reasonably stable molded body. The pressing process is very quick, so the cost of the mold per molded body can be kept very low. However, the moisture of the molded body is so high that it can be dried by heating after pressing got to. The heating is expediently carried out by microwaves, because it causes an even drying process becomes. Microwaves heat from the inside; you would only Heat from the outside, then a dry one soon formed on the outside Skin through which the residual moisture inside is present could only get through very badly. Especially with thin ones Shaped bodies can also be heated conventionally.
  • the molded body is already slightly mechanical resilient, e.g. to be stacked on pallets. He but still has to evaporate for a while.
  • Starch is preferred as the binder.
  • FIG. 1 shows the process stage, where the cellulose fibers are mixed with starch
  • Fig. 2 the process stage where the fiber balls are further broken down
  • Fig. 3 shows the pressing process
  • Fig. 4 shows one Device for the production of paper or plates.
  • Cellulose fibers are used as the starting material. This Fibers are - as is common in papermaking - in Water dissolved. Teen in paper production is eligible fibers used (primary or secondary). These fibers are now mechanically dewatered, for example by means of a Centrifuge. After that the moisture content of the Fibers are around 30-70% depending on the fiber properties. After this Dewatering the fiber material is highly compressed, the individual Fibers are compressed in a small space, similar like with gray cardboard.
  • This material 1 see Fig. 1) with a fast rotating brush 2 loosened in a container 3, at the same time, starch 4 is stirred in as a binder and distributed. The starch particles accumulate evenly from the moist fiber bundles and adhere to their surface. Individual fibers are found at the end of this step and small bundles of fibers side by side. The total volume of the Materials is significantly larger. The fibers are irregular arranged in the room and now need more space.
  • a special one Machine see Fig. 2. It consists of a vertical one Tube 5, at the lower end of a fast rotating Brush 6 is attached.
  • the outside diameter of the brush 6 is equal to the inside diameter of the tube 5.
  • the brush 6 has one Diameter of 10 cm, and it rotates at 10,000 to 20,000 revolutions per minute.
  • a collecting device 7 in Fig. 2 is the front Part broken away, which has an outlet 8.
  • the rotating one Brush 6 acts like a pump and creates an air flow, which enters at the upper opening of the tube 5 and exits at outlet 8. Throw the material into the top of the tube 5, it is sucked past the brush 6, leaving the fiber bundle disassembled and removed with the air flow. There is again an increase in volume.
  • the material which has now been loosened is filled into a press mold 9 and compressed by pressing on the stamp 10.
  • the compressed material can now be extracted from the mold 9 fall without losing its shape.
  • the molded material is then exposed to action heated by microwaves, this creates the for pasting necessary heat.
  • the moisture in the material is sufficient to trigger the gelatinization process. A certain residual moisture stays in the material.
  • This residual moisture loses the heated material when it cools down.
  • drying processes e.g. drying chamber
  • the invention is used to produce paper and plates
  • the procedure is initially carried out in exactly the same way as above up to Fig. 2 is described.
  • the material will not conveyed into a press mold, but on a conveyor belt 21.
  • This creates a fiber carpet 22.
  • Above the conveyor belt 21 there is another conveyor belt 23, so that the fiber carpet 22 pressed between the two conveyor belts 21, 23 becomes.
  • the carpet of fibers 22 is in a dryer 24 heated.
  • the Drying process by heating with a microwave.
  • At thin-walled material is also conventional heating (e.g. heating cylinder) possible.
  • the finished carpet of fibers 22 can be processed into plates or rolled up on rolls become.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

To form a shaped body, paper or boards of cellulose fibers, the fibers are prepared in a watery suspension. The water is extracted mechanically, and the material is loosened by stirring with a brush, and bonding agent is mixed into the separated fibers to give fiber bundles. They are passed into a pipe (5) to be rotated rapidly by a brush (6), with an outer dia. fitting the pipe dimensions. The rapidly rotating fiber bundles form the paper or board, which is heated. The water is extracted from the suspension mechanically, by a centrifuge, or by pressing. The brush rotates within the pipe at a speed of 10000-20000 rpm. The shaped body is heated outside the press mold or the second conveyor belt, using microwaves. The bonding agent is starch.

Description

Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung eines Formkörpers aus Cellulosefasern, bei dem feuchte Cellulosefasern, die mit einem Bindemittel versetzt sind, in eine Pressform eingebracht, insbesondere eingeblasen werden und dort gepresst werden, wonach der Formkörper erhitzt wird. Sie betrifft weiters ein Verfahren zur Herstellung von Papier oder Platten aus Cellulosefasern, bei dem feuchte Cellulosefasern, die mit einem Bindemittel versetzt sind, auf ein Förderband aufgebracht, insbesondere geblasen werden und dort durch ein weiteres Förderband, das oberhalb des ersten Förderbandes lauft, aneinander gedrückt werden.The present invention relates to a method for manufacturing a molded body made of cellulose fibers, in which moist cellulose fibers mixed with a binder are introduced into a mold, in particular blown in are and pressed there, after which the molded body is heated becomes. It also relates to a manufacturing process of paper or sheets of cellulose fibers, in which moist cellulose fibers mixed with a binder are applied to a conveyor belt, in particular blown and there by another conveyor belt that is above of the first conveyor belt is running, pressed together.

Ein Verfahren zur Herstellung eines Formkörpers aus Cellulosefasern ist aus der EP 257 106 A1 bekannt. Die Fasern können gemäß dieser Offenlegungsschrift in der Weise hergestellt werden, dass cellulosehaltige Teilchen mit Dampf, heißem Wasser oder schwachen Laugen aufgeschlossen und in Defibratoren zerfasert und anschließend getrocknet werden. Diese Fasern werden beleimt und in eine Pressform eingeblasen, wo sie dann verdichtet werden. Gegebenenfalls wird der Formkörper dann aus dieser Presse herausgenommen, in eine zweite Presse eingelegt und dort unter Zufuhr von Wärme fertig gepresst. Ein Verfahren zur Herstellung von Papier oder Platten aus Cellulosefasern der eingangs genannten Art ist aus der WO 89/11385 A bekannt. Gemäß dieser Offenlegungsschrift wird eine Faser/Luftsuspension in einen Spalt geblasen, der durch zwei übereinander angeordnete Förderbänder gebildet wird. Unmittelbar vor diesen beiden Förderbändern wird ein Nebel von Klebstoff erzeugt ,und die Fasern werden mit einer derart hohen kinetischen Energie zu den Förderbändern geblasen, dass sie im Wesentlichen geradlinig durch den Neben hindurchfliegen, sodass sie den Klebstoff aufnehmen und sich am Hinterende der zwischen den beiden Förderbändern entstehenden Platte anlagern. A process for producing a molded article from cellulose fibers is known from EP 257 106 A1. The fibers can manufactured in accordance with this laid-open specification that cellulose-containing particles with steam, hot water or weak alkali open minded and in defibrators frayed and then dried. These fibers are glued and blown into a press mold, where they are then be compressed. If necessary, the molded body is then removed from this press, inserted in a second press and pressed there with the supply of heat. On Process for the production of paper or plates from cellulose fibers The type mentioned at the outset is from WO 89/11385 A known. According to this disclosure, a Fiber / air suspension blown into a gap separated by two conveyor belts arranged one above the other is formed. Right away in front of these two conveyor belts a fog of Glue generated, and the fibers are so high blown kinetic energy to the conveyor belts that they essentially fly straight through the side, so that they pick up the glue and stick to the back end the emerging between the two conveyor belts Add the plate.

Nachteilig ist bei diesen bekannten Verfahren, dass die Herstellung lockerer Fasern aus einer wässerigen Suspension nach den bekannten Methoden durch Erhitzen erfolgt, also entsprechend energieaufwändig ist.A disadvantage of these known methods is that the Production of loose fibers from an aqueous suspension done according to the known methods by heating, that is is correspondingly energy-intensive.

Es ist Aufgabe der vorliegenden Erfindung, die Verfahren der eingangs genannten Art in Bezug auf die Herstellung der mit Bindemitteln versetzten Cellulosefasern zu verbessern.It is an object of the present invention, the method of the type mentioned in relation to the manufacture of the to improve cellulose fibers with binders.

Diese Aufgabe wird durch die Verfahren der eingangs genannten Art erfindungsgemäß dadurch gelöst, dass die mit Bindemitteln versetzten Fasern hergestellt werden, indem ein wässeriger Faserbrei mechanisch entwässert wird und dann durch Rühren mit einer Bürste aufgelockert und mit Bindemittel vermischt wird, sodass Faserbündel entstehen, die man in ein Rohr einbringt, in dem eine Bürste, deren Außendurchmesser etwa dem Innendurchmesser des Rohres entspricht, schnell rotiert, wobei auch im Falle der Herstellung von Papier bzw. Platten diese erhitzt werden.This task is accomplished by the procedures of the above Art solved according to the invention in that with binders staggered fibers are made by an aqueous Pulp is mechanically drained and then through Stir with a brush and mix with binder is, so that fiber bundles are created, which one in a Pipes into which a brush whose outer diameter corresponds approximately to the inside diameter of the pipe, rotates quickly, whereby also in the case of the production of paper or Plates these are heated.

Der Erfindung liegt nämlich die überraschende Erkenntnis zu Grunde, dass die Cellulosefasern durchaus nicht absolut trocken sein müssen oder nur eine sehr geringe Feuchtigkeit aufweisen dürfen; die Feuchtigkeit, die sich beim mechanischen Entwässern ergibt (etwa 30-70%) ist durchaus noch akzeptabel. Zum mechanischen Entwässern kann man Zentrifugen verwenden, die Fasern können aber auch gepresst werden.The invention is based on the surprising finding Reason that the cellulose fibers are not absolutely dry must be or have very little moisture allowed to; the moisture that is present in the mechanical Dewatering results (about 30-70%) is still perfectly acceptable. Centrifuges can be used for mechanical dewatering, however, the fibers can also be pressed.

Die Cellulosefasern, die sich auf diese Weise ergeben, liegen nun dicht gepackt und keineswegs in lockerer Form vor. Damit sie mit Bindemitteln versetzt werden können und damit sie form- und pressbar werden, müssen sie jedoch in eine lockere Form übergeführt werden. Dies geschieht gemäß der vorliegenden Erfindung dadurch, dass die entwässerten Cellulosefasern mit einer Bürste in Faserknäuel zerlegt werden, wobei das Bindemittel zugesetzt wird. Dadurch werden die Cellulosefaser bereits stark aufgelockert, sodass sich das Volumen entsprechend vergrößert. Die Fasern werden dann in ein Rohr gegeben, in dem eine Bürste sehr schnell rotiert, z.B. mit 10.000 bis 20.000 Umdrehungen pro Minute. Dadurch werden die Faserknäuel noch weiter zerlegt, und das Bindemittel wird gleichmäßig verteilt. Das Volumen vergrößert sich abermals. Durch die hohe Drehzahl wirkt die Bürste wie eine Fliehkraftpumpe. Sie zerteilt die Fasern nicht nur, sondern befördert sie auch weiter, zweckmäßigerweise gleich in die Pressform. Dort wird das Material gepresst. Im Gegensatz zum Fasergussverfahren muss das Material in der Form nicht getrocknet werden. Obwohl nur mechanisch entwässert wird, ergibt sich wie bei den bekannten trockenen Verfahren nur durch das Pressen bereits ein einigermaßen stabiler Formkörper. Der Pressvorgang geht somit sehr schnell vor sich, sodass die Kosten für die Pressform pro Formkörper sehr gering gehalten werden können. Die Feuchtigkeit des Formkörpers ist allerdings so hoch, dass er nach dem Pressen durch Erhitzen getrocknet werden muss. Zweckmäßigerweise erfolgt das Erhitzen durch Mikrowellen, weil dadurch ein gleichmäßiger Trockenvorgang bewirkt wird. Mikrowellen erhitzen nämlich von Innen; würde man nur von Außen erhitzen, dann bildete sich außen bald eine trockene Haut, durch die die innen vorhandene Restfeuchtigkeit nur sehr schlecht durchkommen könnte. Insbesondere bei dünnen Formkörpern ist aber auch ein herkömmliches Erhitzen möglich.The cellulose fibers that result in this way lie now tightly packed and by no means in a loose form. So that they can be mixed with binders and thus they become malleable and moldable, they have to be in a loose shape Form are transferred. This is done according to the present Invention in that the dewatered cellulose fibers be broken up into a ball of fiber with a brush, whereby the binder is added. This will make the cellulose fiber already loosened up so that the volume enlarged accordingly. The fibers are then placed in a tube in which a brush rotates very quickly, e.g. With 10,000 to 20,000 revolutions per minute. This will make the Ball of fiber is broken down even further, and the binder becomes equally distributed. The volume increases again. Due to the high speed, the brush acts like a centrifugal pump. It not only cuts the fibers, but also promotes them they also continue, expediently straight into the mold. The material is pressed there. In contrast to the fiber casting process the material does not need to be dried in the mold. Although it is only mechanically drained, the result is how in the known dry processes only by pressing already a reasonably stable molded body. The pressing process is very quick, so the cost of the mold per molded body can be kept very low. However, the moisture of the molded body is so high that it can be dried by heating after pressing got to. The heating is expediently carried out by microwaves, because it causes an even drying process becomes. Microwaves heat from the inside; you would only Heat from the outside, then a dry one soon formed on the outside Skin through which the residual moisture inside is present could only get through very badly. Especially with thin ones Shaped bodies can also be heated conventionally.

Danach ist der Formkörper bereits geringfügig mechanisch belastbar, er kann z.B. auf Paletten gestapelt werden. Er muss aber noch einige Zeit ausdunsten.After that, the molded body is already slightly mechanical resilient, e.g. to be stacked on pallets. He but still has to evaporate for a while.

Als Bindemittel wird Stärke bevorzugt.Starch is preferred as the binder.

Anhand der beiliegenden Figuren wird die vorliegende Erfindung näher erläutert. Es zeigt: Fig. 1 die Verfahrensstufe, wo die Cellulosefasern mit Stärke vermischt werden; Fig. 2 die Verfahrensstufe, wo die Faserknäuel weiter zerlegt werden; Fig. 3 zeigt den Pressvorgang; und Fig. 4 zeigt eine Vorrichtung zur Herstellung von Papier oder Platten.The present invention is based on the attached figures explained in more detail. 1 shows the process stage, where the cellulose fibers are mixed with starch; Fig. 2 the process stage where the fiber balls are further broken down; Fig. 3 shows the pressing process; and Fig. 4 shows one Device for the production of paper or plates.

Als Ausgangsstoff werden Cellulosefasern verwendet. Diese Fasern werden - wie bei der Papierherstellung üblich - in Wasser aufgelöst. Infrage kommen alle in der Papierherstellung verwendeten Fasern (primär oder sekundär). Diese Fasern werden nun mechanisch entwässert, beispielsweise mittels einer Zentrifuge. Danach liegt der Feuchtigkeitsgehalt der Fasern je nach Faserbeschaffenheit bei ca. 30-70%. Nach dem Entwässern ist das Fasermaterial stark komprimiert, die einzelnen Fasern sind auf einen kleinen Raum verdichtet, ähnlich wie bei Graupappe. Dieses Material 1 (s. Fig. 1) wird mit einer schnelldrehenden Bürste 2 in einem Behälter 3 aufgelockert, gleichzeitig wird als Bindemittel Stärke 4 eingerührt und verteilt. Die Stärketeilchen lagern sich gleichmäßig an den feuchten Faserbündeln ab und haften auf deren Oberfläche. Am Ende dieses Arbeitsschrittes finden sich einzelne Fasern und kleine Faserbündel nebeneinander. Das Gesamtvolumen des Materials ist deutlich größer. Die Fasern sind unregelmäßig im Raum angeordnet und benötigen jetzt mehr Platz.Cellulose fibers are used as the starting material. This Fibers are - as is common in papermaking - in Water dissolved. Anyone in paper production is eligible fibers used (primary or secondary). These fibers are now mechanically dewatered, for example by means of a Centrifuge. After that the moisture content of the Fibers are around 30-70% depending on the fiber properties. After this Dewatering the fiber material is highly compressed, the individual Fibers are compressed in a small space, similar like with gray cardboard. This material 1 (see Fig. 1) with a fast rotating brush 2 loosened in a container 3, at the same time, starch 4 is stirred in as a binder and distributed. The starch particles accumulate evenly from the moist fiber bundles and adhere to their surface. Individual fibers are found at the end of this step and small bundles of fibers side by side. The total volume of the Materials is significantly larger. The fibers are irregular arranged in the room and now need more space.

Nun folgt ein Auflockerungsverfahren mit einer speziellen Maschine (siehe Fig. 2). Sie besteht aus einem senkrecht angebrachten Rohr 5, an dessen unteren Ende eine schnelldrehende Bürste 6 angebracht ist. Der Außendurchmesser der Bürste 6 ist gleich dem Innendurchmesser des Rohres 5. Zwischen Bürste 6 und Rohr 5 soll ein möglichst kleiner Spalt sein. Bei einem konkreten Ausführungsbeipiel hat die Bürste 6 einen Durchmesser von 10 cm, und sie dreht sich mit 10.000 bis 20.000 Umdrehungen pro Minute. Unterhalb des Rohres 5 befindet sich eine Sammelvorrichtung 7 (in Fig. 2 ist der vordere Teil weggebrochen), die einen Auslass 8 aufweist. Die rotierende Bürste 6 wirkt wie eine Pumpe und erzeugt einen Luftstrom, der an der oberen Öffnung des Rohres 5 eintritt und beim Auslass 8 austritt. Wirft man das Material oben ins Rohr 5, wird es an der Bürste 6 vorbei gesaugt, wobei die Faserbündel zerlegt und mit dem Luftstrom abtransportiert werden. Es kommt wiederum zu einer Volumsvergrößerung.Now there is a loosening process with a special one Machine (see Fig. 2). It consists of a vertical one Tube 5, at the lower end of a fast rotating Brush 6 is attached. The outside diameter of the brush 6 is equal to the inside diameter of the tube 5. Between Brush 6 and tube 5 should be as small a gap as possible. In a specific embodiment, the brush 6 has one Diameter of 10 cm, and it rotates at 10,000 to 20,000 revolutions per minute. Is located below the tube 5 a collecting device 7 (in Fig. 2 is the front Part broken away), which has an outlet 8. The rotating one Brush 6 acts like a pump and creates an air flow, which enters at the upper opening of the tube 5 and exits at outlet 8. Throw the material into the top of the tube 5, it is sucked past the brush 6, leaving the fiber bundle disassembled and removed with the air flow. There is again an increase in volume.

Das nun aufgelockerte Material wird in eine Pressform 9 gefüllt und mittels Druck auf den Stempel 10 komprimiert. Das komprimierte Material lässt sich nun aus der Pressform 9 stürzen, ohne seine Form zu verlieren.The material which has now been loosened is filled into a press mold 9 and compressed by pressing on the stamp 10. The compressed material can now be extracted from the mold 9 fall without losing its shape.

Das geformte Material wird anschließend durch Einwirkung von Mikrowellen erhitzt, dadurch entsteht die zum Verkleistern notwendige Hitze. Die Feuchtigkeit im Material genügt, um den Verkleisterungsprozess auszulösen. Eine gewisse Restfeuchte bleibt im Material.The molded material is then exposed to action heated by microwaves, this creates the for pasting necessary heat. The moisture in the material is sufficient to trigger the gelatinization process. A certain residual moisture stays in the material.

Diese Restfeuchte verliert das erhitzte Material beim Abkühlen. Durch bekannte Trocknungsverfahren (z.B. Trockenkammer) kann dieser Prozess beschleunigt werden.This residual moisture loses the heated material when it cools down. Using known drying processes (e.g. drying chamber) this process can be accelerated.

Zur Herstellung von Papier und Platten wird das erfindungsgemäße Verfahren zunächst genauso durchgeführt, wie dies oben bis zur Fig. 2 beschrieben ist. Dann wird das Material aber nicht in eine Pressform befördert, sondern auf ein Förderband 21. Dadurch entsteht ein Faserteppich 22. Über dem Förderband 21 befindet sich ein weiteres Förderband 23, sodass der Faserteppich 22 zwischen den beiden Förderbändern 21, 23 gepresst wird. Danach wird der Faserteppich 22 in einem Trockner 24 erhitzt. Bei stärkerem Material erfolgt der Trocknungsprozess durch Erhitzen mittels Mikrowelle. Bei dünnwandigem Material ist aber auch eine herkömmliche Erhitzung (z.B. Heizzylinder) möglich. Der fertige Faserteppich 22 kann zu Platten weiterverarbeitet werden oder auf Rollen aufgerollt werden.The invention is used to produce paper and plates The procedure is initially carried out in exactly the same way as above up to Fig. 2 is described. Then the material will not conveyed into a press mold, but on a conveyor belt 21. This creates a fiber carpet 22. Above the conveyor belt 21 there is another conveyor belt 23, so that the fiber carpet 22 pressed between the two conveyor belts 21, 23 becomes. Thereafter, the carpet of fibers 22 is in a dryer 24 heated. With stronger material, the Drying process by heating with a microwave. At thin-walled material is also conventional heating (e.g. heating cylinder) possible. The finished carpet of fibers 22 can be processed into plates or rolled up on rolls become.

Claims (8)

Verfahren zur Herstellung eines Formkörpers aus Cellulosefasern, bei dem Cellulosefasern entwässert und mit einem Bindemittel versetzt werden, wonach sie mit einer Bürste aufgelockert und in eine Pressform eingebracht, insbesondere eingeblasen werden und dort gepresst werden, wonach der Formkörper erhitzt wird, dadurch gekennzeichnet, dass die mit Bindemitteln versetzten Fasern hergestellt werden, indem ein wässeriger Faserbrei mechanisch entwässert wird und dann durch Rühren mit einer Bürste aufgelockert und mit Bindemittel vermischt wird, sodass Faserbündel entstehen, die man in ein Rohr einbringt, in dem eine Bürste, deren Außendurchmesser etwa dem Innendurchmesser des Rohres entspricht, schnell rotiert.A process for the production of a shaped body from cellulose fibers, in which cellulose fibers are dewatered and mixed with a binder, after which they are loosened with a brush and introduced into a press mold, in particular are blown in and pressed there, after which the shaped body is heated, characterized in that the fibers containing binder are produced by mechanically dewatering an aqueous pulp and then loosening by stirring with a brush and mixing with binder, so that fiber bundles are formed which are placed in a tube in which a brush whose outer diameter is approximately the same as the inner diameter of the Tube, rotates quickly. Verfahren zur Herstellung von Papier oder Platten aus Cellulosefasern, bei dem feuchte Cellulosefasern, die mit einem Bindemittel versetzt sind, auf ein Förderband aufgebracht, insbesondere geblasen werden und dort durch ein weiteres Förderband, das oberhalb des ersten Förderbandes lauft, aneinander gedrückt werden, dadurch gekennzeichnet, dass die mit Bindemittel versetzten Fasern hergestellt werden, indem ein wässeriger Faserbrei mechanisch entwässert wird und dann durch Rühren mit einer Bürste aufgelockert und mit Bindemittel vermischt wird, sodass Faserbündel entstehen, die man in ein Rohr einbringt, in dem eine Bürste, deren Außendurchmesser etwa dem Innendurchmesser des Rohres entspricht, schnell rotiert, und dass das Papier bzw. die Platte erhitzt wird.A process for the production of paper or sheets of cellulose fibers, in which moist cellulose fibers, which have been mixed with a binder, are applied to a conveyor belt, in particular blown, and pressed together there by a further conveyor belt which runs above the first conveyor belt, characterized in that that the binder-containing fibers are produced by mechanically dewatering an aqueous pulp and then loosening by stirring with a brush and mixing it with binder, so that fiber bundles are formed which are introduced into a tube in which a brush, the outside diameter of which is approximately corresponds to the inside diameter of the tube, rotates quickly, and that the paper or plate is heated. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass zum mechanischen Entwässern eine Zentrifuge verwendet wird.A method according to claim 1 or 2, characterized in that a centrifuge is used for mechanical dewatering. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Fasern zum mechanischen Entwässern gepresst werden.A method according to claim 1 or 2, characterized in that the fibers are pressed for mechanical dewatering. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Bürste im Rohr mit 10.000 bis 20.000 Umdrehungen pro Minute rotiert. Method according to one of claims 1 to 4, characterized in that the brush rotates in the tube at 10,000 to 20,000 revolutions per minute. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Erhitzen des Formkörpers nach dem Pressen außerhalb der Pressform bzw. des zweiten Förderbandes erfolgt.Method according to one of claims 1 to 5, characterized in that the heating of the molded body after the pressing takes place outside the mold or the second conveyor belt. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass das Erhitzen durch Mikrowellen erfolgt.A method according to claim 6, characterized in that the heating is carried out by microwaves. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass als Bindemittel Stärke verwendet wird.Method according to one of claims 1 to 7, characterized in that starch is used as a binder.
EP99890353A 1998-11-03 1999-11-03 Process for preparing a workpiece from cellulose fibers, as well as process for the manufacture of paper or sheets made of cellulose fibers Withdrawn EP1005965A1 (en)

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AT182498A AT407407B (en) 1998-11-03 1998-11-03 METHOD FOR PRODUCING A MOLDED BODY FROM CELLULOSE FIBERS, AND METHOD FOR PRODUCING PAPER OR PLATES FROM CELLULOSE FIBERS
AT182498 1998-11-03

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0257106A1 (en) * 1986-07-26 1988-03-02 Werzalit - Werke J.F. Werz KG Method and apparatus for making articles from bonded fibres
WO1989011385A1 (en) * 1988-05-19 1989-11-30 Fredriksson, Sven A method and apparatus for manufacturing fiber slabs
EP0616960A2 (en) * 1993-03-24 1994-09-28 BFI ENTSORGUNGSTECHNOLOGIE GmbH Device for and method of distributing materials
EP0753541A1 (en) * 1995-07-11 1997-01-15 Bct Ag Moulding composition from vegetable fibres, process for producing moulded article, apparatus for pressing the moulding composition and moulded part

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0224205B1 (en) * 1985-11-19 1992-07-22 Toyota Jidosha Kabushiki Kaisha Method for the manufacture of a molden wooden product
US5641449A (en) * 1995-09-15 1997-06-24 Owens; Thomas L. Method and apparatus for high-speed drying and consolidating of structural fiberboard

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0257106A1 (en) * 1986-07-26 1988-03-02 Werzalit - Werke J.F. Werz KG Method and apparatus for making articles from bonded fibres
WO1989011385A1 (en) * 1988-05-19 1989-11-30 Fredriksson, Sven A method and apparatus for manufacturing fiber slabs
EP0616960A2 (en) * 1993-03-24 1994-09-28 BFI ENTSORGUNGSTECHNOLOGIE GmbH Device for and method of distributing materials
EP0753541A1 (en) * 1995-07-11 1997-01-15 Bct Ag Moulding composition from vegetable fibres, process for producing moulded article, apparatus for pressing the moulding composition and moulded part

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AT407407B (en) 2001-03-26

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