EP1504865B1 - Method and apparatus for coating pourable materials with a binder - Google Patents

Method and apparatus for coating pourable materials with a binder Download PDF

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Publication number
EP1504865B1
EP1504865B1 EP04018258A EP04018258A EP1504865B1 EP 1504865 B1 EP1504865 B1 EP 1504865B1 EP 04018258 A EP04018258 A EP 04018258A EP 04018258 A EP04018258 A EP 04018258A EP 1504865 B1 EP1504865 B1 EP 1504865B1
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Prior art keywords
wetting
section
free
materials
flowing
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EP04018258A
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German (de)
French (fr)
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EP1504865A2 (en
EP1504865A3 (en
Inventor
Peter Wolff
Klaus Radzimanowski
Roberto Fasa
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SCHENCKMANN-PIEL-Engineering GmbH
Dieffenbacher GmbH and Co KG
Original Assignee
SCHENCKMANN PIEL ENGINEERING G
SCHENCKMANN-PIEL-Engineering GmbH
Dieffenbacher GmbH and Co KG
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Publication of EP1504865A3 publication Critical patent/EP1504865A3/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE 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
    • B27N1/00—Pretreatment of moulding material
    • B27N1/02—Mixing the material with binding agent
    • B27N1/0227—Mixing the material with binding agent using rotating stirrers, e.g. the agent being fed through the shaft of the stirrer
    • B27N1/0254—Mixing the material with binding agent using rotating stirrers, e.g. the agent being fed through the shaft of the stirrer with means for spraying the agent on the material before it is introduced in the mixer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE 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
    • B27N1/00—Pretreatment of moulding material
    • B27N1/02—Mixing the material with binding agent

Definitions

  • the invention relates to a method and a device for wetting free-flowing goods with a binder.
  • free-flowing goods in particular lignocellulose-containing particles such as wood fibers, wood chips, wood chips and fibers, chips and chips from renewable raw materials such as straw, hemp, bamboo, rice straw and granular plastic materials are included.
  • Plate-shaped materials in particular fibreboards, are produced by pressing glued fibers.
  • the wetting of the fibers with a binder is an important process step in this production process.
  • the gluing systems or processes have the task of distributing the binder uniformly over the fibers so that the binder content can be kept low.
  • a known method for gluing of free-flowing goods is the so-called blow-line gluing.
  • the still wet fibers are transported by vapor pressure through a conveyor line and thereby admixed with binder.
  • the glued fibers are then dried in a dryer and fed to the further production process.
  • fiber drying after gluing has the disadvantage of high glue consumption. Since the cost of the glue (binder) in relation to the cost of the fibers are very high, the high glue consumption represents a drastic increase in manufacturing costs.
  • Another disadvantage of this glue method is that is released during the drying of the previously glued fibers formaldehyde and hereby consuming dryer exhaust air cleaning measures are required.
  • Such a method and a device for the dry gluing of pneumatically conveyed particles is known.
  • the wood fibers are first dried in a dryer to the required final moisture content and then fed via a delivery line having a cross-sectional reduction, a wetting section.
  • the wetting section is provided with glue nozzles.
  • the wetting section is designed as a diffuser section, which is intended to effect a cross-sectional widening and thus a turbulent flow of the fibers in the section.
  • the process described above is intended to avoid the formation of fiber clumps, as these fiber clusters in the fiberboard surface can lead to size stains as well as causing damage to the press belts of the press.
  • the object of the present invention is to develop a method and a device for wetting flowable goods with a binder in the course of the production of plate-shaped materials in such a way that a uniform glue distribution and a high level of operational reliability are achieved.
  • the bulk goods to be wetted with binders referred to below as particles, are first dried to final moisture content.
  • the dried particles are then fed by means of transport air to a wetting section which is provided with a plurality of gluing nozzles.
  • the gluing nozzles are arranged spirally distributed along the wetting section over the circumference.
  • a reducing section which effects a cross-sectional reduction of D1 of the delivery line to D2 of the wetting section.
  • the Fig. 1 shows a schematic representation of the device according to the invention for the wetting of particles, in particular of wood fibers with a binder in the course of the production of fiberboard.
  • the delivery line 4 is charged by means of a heat exchanger 5 with heated air, which has approximately 60-120 °, preferably 90 °.
  • heated air serves as transport air and leads the wood fibers along the conveying line 4 in the direction of the arrows 6 to the wetting section 7.
  • the transport air could also have room temperature.
  • a reducing section 8 is integrated in the conveying line 4, which causes a reduction of the diameter D1 of the conveying line 4 to a diameter D2 and thus an increase in the speed of the conveyed wood fibers.
  • the subsequent to the Reduzierabites 8 wetting section 7 is formed as a pipe section with a constant diameter D2.
  • the diameter of the pipe section may also be formed slightly smaller or larger in the conveying direction.
  • the length of the wetting section L1 is 20 to 30 meters, depending on the plant capacity. Due to the reduction of the diameter from D1 to D2 immediately before the wetting section 7, the wood fibers reach a maximum speed of about 30-60 m / s when flowing into the wetting section 7.
  • a plurality of circumferentially spirally arranged glue nozzles 9 are provided in the conveying direction along the wetting portion 7 .
  • the number and arrangement of the glue nozzles 9 can be adjusted depending on the type of glue and the amount of glue.
  • the glue or binder is brought by dilution to the viscosity required for the injection.
  • the wetting portion 7 is made of a high-quality polished material to prevent glue deposits on the inner circumferential surface along the wetting portion 7.
  • Furthermore, in order to prevent caking on the shell inner surface of the wetting portion 7 is formed as a double-walled tube having an inlet E and an outlet A for a cooling medium. The temperature of the cooling medium is adjusted so that forms a condensate film on the pipe inner wall.
  • an indwelling zone 10 is formed, which is likewise designed as a pipe section with the diameter D2 and has a length L2 of approximately 15 to 30 meters.
  • This pipe section is also made of high quality polished material to prevent glue deposits.
  • the wetting zone 7 downstream of the wetting zone 7 serves to further homogenize the wetting of the fibers.
  • a mixing chamber 11 is arranged, which is provided with baffles to effect a uniform mixing of the glued fibers with an additionally supplied air flow.
  • the baffles are arranged parallel spaced in the conveying direction running.
  • the supplied air stream has a temperature of 60-120 ° C., preferably 90 ° C., and is supplied to the mixing chamber 11 via a separate feed line 12.
  • Downstream of the mixing chamber 11 is a further conveying line 13, in which the glued fibers are post-dried by means of the supplied hot air. This drying is on this Place required because the glue was added to the fibers water and thus the previously set final moisture was increased by wetting with binder.
  • the feed line 13 downstream of the mixing chamber 11 has a substantially larger diameter D3 than the diameter of the wetting and residence section, so that the transport speed at this point is reduced and the residence time in this section is greater.
  • the glued fibers pass through a cyclone and are subsequently fed to the scattering bunker associated with a forming station. There, the glued fibers are sprinkled to a non-woven fabric and then pressed into wood fiber boards.

Abstract

To soak loose materials with a bonding agent, they are dried to a residual moisture content level of 3-20% and transferred to a conveyor channel (4). They are carried in a heated air stream to the wetting station (7), where a preceding section (8) with a reduced cross section accelerates the flow speed directly in front of it. At the wetting station, the bonding agent is delivered by jets (9), and the saturated material is passed through a dwell section (10), before passing into a conveyor channel (13) using a heated carrier gas giving final drying.

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Benetzen von rieselfähigen Gütern mit einem Bindemittel. Unter rieselförmigen Gütern sind hierbei insbesondere lignozellulosehaltige Partikel wie Holzfasern, Holzspäne, Holzschnitzel sowie Fasern, Schnitzel und Späne aus nachwachsenden Rohstoffen wie Stroh, Hanf, Bambus, Reisstroh und granulären Kunststoffmaterialien umfasst.The invention relates to a method and a device for wetting free-flowing goods with a binder. Under free-flowing goods in particular lignocellulose-containing particles such as wood fibers, wood chips, wood chips and fibers, chips and chips from renewable raw materials such as straw, hemp, bamboo, rice straw and granular plastic materials are included.

Plattenförmige Werkstoffe, insbesondere Faserplatten, werden durch Verpressen von beleimten Fasern hergestellt. Das Benetzen der Fasern mit einem Bindemittel stellt in diesem Herstellungsprozess einen wichtigen Verfahrensschritt dar. Die Beleimungssysteme bzw. -verfahren haben dabei die Aufgabe, das Bindemittel gleichmäßig auf die Fasern zu verteilen, so dass der Bindemittelanteil gering gehalten werden kann.Plate-shaped materials, in particular fibreboards, are produced by pressing glued fibers. The wetting of the fibers with a binder is an important process step in this production process. The gluing systems or processes have the task of distributing the binder uniformly over the fibers so that the binder content can be kept low.

Ein bekanntes Verfahren zur Beleimung von rieselförmigen Gütern ist die sogenannte Blow-Line-Beleimung. Hierbei werden die noch nassen Fasern mittels Dampfdruck durch eine Förderleitung transportiert und dabei mit Bindemittel bedüst. Die beleimten Fasern werden anschließend in einem Trockner getrocknet und dem weiteren Herstellungsprozess zugeführt. Die Fasertrocknung nach der Beleimung hat jedoch den Nachteil eines hohen Leimverbrauches. Da die Kosten des Leims (Bindemittel) im Verhältnis zu den Kosten der Fasern sehr hoch sind, stellt der hohe Leimverbrauch eine drastische Erhöhung der Herstellungskosten dar. Ein weiterer Nachteil bei diesem Beleimungsverfahren ist, das bei der Trocknung der zuvor beleimten Fasern Formaldehyd freigesetzt wird und hierdurch aufwendige Trocknerabluft-Reinigungsmaßnahmen erforderlich sind.A known method for gluing of free-flowing goods is the so-called blow-line gluing. Here, the still wet fibers are transported by vapor pressure through a conveyor line and thereby admixed with binder. The glued fibers are then dried in a dryer and fed to the further production process. However, fiber drying after gluing has the disadvantage of high glue consumption. Since the cost of the glue (binder) in relation to the cost of the fibers are very high, the high glue consumption represents a drastic increase in manufacturing costs. Another disadvantage of this glue method is that is released during the drying of the previously glued fibers formaldehyde and hereby consuming dryer exhaust air cleaning measures are required.

Im Unterschied zur vorstehend beschriebenen Nassbeleimung sind auch einige Vorrichtung und Verfahren zur Trockenbeleimung bekannt.In contrast to the wet gluing described above, some apparatus and methods for dry gluing are also known.

Aus der EP 0 728 562 ist ein derartiges Verfahren und eine Vorrichtung zur Trockenbeleimung von pneumatisch geförderten Partikeln bekannt. Hierbei werden die Holzfasern zunächst in einem Trockner auf die erforderliche Endfeuchte getrocknet und dann über eine Förderleitung die eine Querschnittsreduzierung aufweist, einem Benetzungsabschnitt zugeführt. Der Benetzungsabschnitt ist mit Leimdüsen versehen. Um ein gleichmäßiges Benetzen der Partikel zu erzielen, ist der Benetzungsabschnitt als Diffusorabschnitt ausgebildet, der eine Querschnitterweiterung und somit eine turbulente Strömung der Fasern in dem Abschnitt bewirken soll.From the EP 0 728 562 Such a method and a device for the dry gluing of pneumatically conveyed particles is known. Here, the wood fibers are first dried in a dryer to the required final moisture content and then fed via a delivery line having a cross-sectional reduction, a wetting section. The wetting section is provided with glue nozzles. In order to achieve a uniform wetting of the particles, the wetting section is designed as a diffuser section, which is intended to effect a cross-sectional widening and thus a turbulent flow of the fibers in the section.

Aufgrund der turbulenten Strömung soll mit dem oben beschriebenen Verfahren das bilden von Faserzusammenballungen vermieden werden, da diese Faserzusammenballungen in der Faserplattenoberfläche zu Leimflecken führt sowie Schäden an den Pressbändern der Presse verursachen können.Due to the turbulent flow, the process described above is intended to avoid the formation of fiber clumps, as these fiber clusters in the fiberboard surface can lead to size stains as well as causing damage to the press belts of the press.

Aufgabe der vorliegenden Erfindung ist, es ein Verfahren und eine Vorrichtung zum Benetzen von rieselfähigen Gütern mit einem Bindemittel im Zuge der Herstellung von plattenförmigen Werkstoffen derart weiterzubilden, dass eine gleichmäßige Leimverteilung sowie eine hohe Betriebssicherheit erreicht wird.The object of the present invention is to develop a method and a device for wetting flowable goods with a binder in the course of the production of plate-shaped materials in such a way that a uniform glue distribution and a high level of operational reliability are achieved.

Diese Aufgabe wir durch die im Patentanspruch 1 bzw. Patentanspruch 5 angegebenen Merkmale gelöst.This problem is solved by the features specified in patent claim 1 and claim 5.

Gemäß dem erfindungsgemäßen Verfahren werden die mit Bindemittel zu benetzenden rieselförmigen Güter, nachfolgend Partikel genannt, zunächst auf Endfeuchte getrocknet.According to the process of the invention, the bulk goods to be wetted with binders, referred to below as particles, are first dried to final moisture content.

Die getrockneten Partikel werden dann mittels Transportluft einem Benetzungsabschnitt zugeführt, der mit einer Vielzahl von Beleimungsdüsen versehen ist. Vorzugsweise sind die Beleimungsdüsen längs des Benetzungsabschnittes über den Umfang verteilt spiralförmig angeordnet.The dried particles are then fed by means of transport air to a wetting section which is provided with a plurality of gluing nozzles. Preferably, the gluing nozzles are arranged spirally distributed along the wetting section over the circumference.

Unmittelbar vor dem Benetzungsabschnitt ist ein Reduzierabschnitt vorgesehen, der eine Querschnittsreduzierung von D1 der Förderleitung auf D2 des Benetzungsabschnittes bewirkt.Immediately before the wetting section, a reducing section is provided which effects a cross-sectional reduction of D1 of the delivery line to D2 of the wetting section.

Diese Reduzierung des Querschnittes in Förderrichtung bewirkt eine Geschwindigkeitserhöhung des geförderten Partikelstroms. Aufgrund der Vielzahl der vorgesehenen Beleimungsdüsen und die Anordnung der Beleimungsdüsen längs des Benetzungsabschnittes sowie der hohen Geschwindigkeit des Partikelstromes im Benetzungsabschnitt wird eine gute Verwirbelung der Partikel und gleichmäßige Verteilung des Bindemittels auf den Partikeln erreicht.This reduction of the cross section in the conveying direction causes an increase in the speed of the conveyed particle flow. Due to the large number of provided Beleimungsdüsen and the arrangement of Beleimungsdüsen along the wetting section and the high velocity of the particle flow in the wetting section a good turbulence of the particles and uniform distribution of the binder is achieved on the particles.

Durch dieses erfindungsgemäße Verfahren wird die Bildung von Faserzusammenballungen vermieden, so dass Leimfleckenbildung und auch insbesondere Beschädigungen an nachfolgenden Anlagenteilen wie Pressbänder verhindert werden.By this method according to the invention, the formation of fiber aggregates is avoided, so that glue staining and in particular damage to subsequent system parts such as press belts are prevented.

Die Fig. 1 zeigt in schematischer Darstellung die erfindungsgemäße Vorrichtung zum Benetzen von Partikeln insbesondere von Holzfasern mit einem Bindemittel im Zuge der Herstellung von Faserplatten.The Fig. 1 shows a schematic representation of the device according to the invention for the wetting of particles, in particular of wood fibers with a binder in the course of the production of fiberboard.

Die zuvor aufbereiteten Holzfasern werden hierbei zunächst einem nicht dargestellten Trockner zugeführt, in dem die Holzfasern auf eine für den Herstellungsprozess erforderliche Endfeuchte von ca. 3 - 20%, vorzugsweise 10 - 12%, getrocknet werden. Im Anschluss an den Trockner, der ein üblicher Trockner, beispielsweise ein Stromtrockner ist und der an dieser Stelle nicht näher beschrieben wird, werden die getrockneten Holzfasern zum Abtrennen der Trocknungsluft einem Zyklon 1 zugeführt, von wo aus sie über eine Zuführung 2 und eine Schleuse 3 in eine Förderleitung 4 aufgegeben werden.The previously treated wood fibers are first supplied to a dryer, not shown, in which the wood fibers to a required for the production process final moisture content of about 3 - 20%, preferably 10 - 12%, dried. Following the dryer, which is a conventional dryer, such as a power dryer and will not be described in detail here, the dried wood fibers are supplied to separate the drying air to a cyclone 1, from where they have a feed 2 and a lock third be abandoned in a delivery line 4.

Die Förderleitung 4 wird mittels eines Wärmetauschers 5 mit erhitzter Luft beschickt, die in etwa 60 - 120°, vorzugsweise 90° aufweist. Die erhitzte Luft dient als Transportluft und führt die Holzfasern längs der Förderleitung 4 in Richtung der Pfeile 6 dem Benetzungsabschnitt 7 zu. In einem alternativen Ausführungsbeispiel könnte die Transportluft auch Raumtemperatur aufweisen.The delivery line 4 is charged by means of a heat exchanger 5 with heated air, which has approximately 60-120 °, preferably 90 °. The heated air serves as transport air and leads the wood fibers along the conveying line 4 in the direction of the arrows 6 to the wetting section 7. In an alternative embodiment, the transport air could also have room temperature.

Unmittelbar vor dem Benetzungsabschnitt 7 ist in die Förderleitung 4 ein Reduzierabschnitt 8 integriert, welcher eine Reduzierung des Durchmessers D1 der Förderleitung 4 auf einen Durchmesser D2 und somit eine Geschwindigkeitserhöhung der geförderten Holzfasern bewirkt. Der an den Reduzierabschnitt 8 anschließende Benetzungsabschnitt 7 ist als Rohrabschnitt mit gleichbleibenden Durchmesser D2 ausgebildet. Der Durchmesser des Rohrabschnittes kann in Förderrichtung auch geringfügig kleiner oder größer werdend ausgebildet sein. Die Länge des Benetzungsabschnittes L1 beträgt je nach Anlagenkapazität 20 bis 30 Meter. Aufgrund der Reduzierung des Durchmessers von D1 auf D2 unmittelbar vor dem Benetzungsabschnitt 7 erreichen die Holzfasern beim Einströmen in den Benetzungsabschnitt 7 eine maximale Geschwindigkeit von ca. 30 - 60 m/s.Immediately before the wetting section 7, a reducing section 8 is integrated in the conveying line 4, which causes a reduction of the diameter D1 of the conveying line 4 to a diameter D2 and thus an increase in the speed of the conveyed wood fibers. The subsequent to the Reduzierabschnitt 8 wetting section 7 is formed as a pipe section with a constant diameter D2. The diameter of the pipe section may also be formed slightly smaller or larger in the conveying direction. The length of the wetting section L1 is 20 to 30 meters, depending on the plant capacity. Due to the reduction of the diameter from D1 to D2 immediately before the wetting section 7, the wood fibers reach a maximum speed of about 30-60 m / s when flowing into the wetting section 7.

In Förderrichtung sind längs des Benetzungsabschnittes 7 eine Vielzahl über den Umfang spiralförmig angeordneter Leimdüsen 9 vorgesehen. Die Anzahl und Anordnung der Leimdüsen 9 kann je nach Leimtyp und Leimmenge angepasst werden. Der Leim bzw. das Bindemittel wird durch Verdünnen auf die für das Eindüsen erforderliche Viskosität gebracht. Der Benetzungsabschnitt 7 besteht aus einem hochwertigen polierten Material, um Leimablagerungen an der inneren Mantelfläche längs des Benetzungsabschnittes 7 zu verhindern. Weiterhin ist zur Vermeidung von Anbackungen an der Mantelinnenfläche der Benetzungsabschnitt 7 als doppelwandiges Rohr mit einem Einlass E und einem Auslass A für ein Kühlmedium ausgebildet. Die Temperatur des Kühlmediums wird derart eingestellt, dass sich an der Rohrinnenwand ein Kondensatfilm bildet.In the conveying direction along the wetting portion 7 a plurality of circumferentially spirally arranged glue nozzles 9 are provided. The number and arrangement of the glue nozzles 9 can be adjusted depending on the type of glue and the amount of glue. The glue or binder is brought by dilution to the viscosity required for the injection. The wetting portion 7 is made of a high-quality polished material to prevent glue deposits on the inner circumferential surface along the wetting portion 7. Furthermore, in order to prevent caking on the shell inner surface of the wetting portion 7 is formed as a double-walled tube having an inlet E and an outlet A for a cooling medium. The temperature of the cooling medium is adjusted so that forms a condensate film on the pipe inner wall.

Im Anschluss an den Benetzungsabschnitt 7 ist eine Verweilzone 10 ausgebildet, die ebenfalls als Rohrabschnitt mit dem Durchmesser D2 ausgebildet ist und eine Länge L2 von ca. 15 bis 30 Meter aufweist. Dieser Rohrabschnitt besteht ebenfalls aus hochwertigem poliertem Material, damit Leimablagerungen vermieden werden. Die der Benetzungszone 7 nachgeschaltete Verweilzone 10 dient zur weiteren Vergleichmäßigung der Benetzung der Fasern.Subsequent to the wetting section 7, an indwelling zone 10 is formed, which is likewise designed as a pipe section with the diameter D2 and has a length L2 of approximately 15 to 30 meters. This pipe section is also made of high quality polished material to prevent glue deposits. The wetting zone 7 downstream of the wetting zone 7 serves to further homogenize the wetting of the fibers.

Im Anschluss an die Verweilzone 10 ist eine Mischkammer 11 angeordnet, die mit Leitblechen versehen ist, um eine gleichmäßige Vermischung der beleimten Fasern mit einem zusätzlich zugeführten Luftstrom zu bewirken. Die Leitbleche sind dabei parallel beabstandet in Förderrichtung verlaufend angeordnet. Der zugeführte Luftstrom weist eine Temperatur von 60 - 120°C, vorzugsweise 90°C auf und wird über eine separate Zuführleitung 12 der Mischkammer 11 zugeführt. Der Mischkammer 11 nachgeschaltet ist eine weitere Förderleitung 13, in der die beleimten Fasern mittels der zugeführten heißen Luft nachgetrocknet werden. Diese Nachtrocknung ist an dieser Stelle erforderlich, da durch die Leimzugabe den Fasern Wasser zugeführt und somit die zuvor eingestellte Endfeuchte durch das Benetzen mit Bindemittel erhöht wurde. Die der Mischkammer 11 nachgeschaltete Förderleitung 13 besitzt gegenüber dem Durchmesser des Benetzungs- und Verweilabschnittes einen wesentlich größeren Durchmesser D3, so dass die Transportgeschwindigkeit an dieser Stelle verringert wird und die Verweilzeit in diesem Abschnitt größer ist.Following the residence zone 10, a mixing chamber 11 is arranged, which is provided with baffles to effect a uniform mixing of the glued fibers with an additionally supplied air flow. The baffles are arranged parallel spaced in the conveying direction running. The supplied air stream has a temperature of 60-120 ° C., preferably 90 ° C., and is supplied to the mixing chamber 11 via a separate feed line 12. Downstream of the mixing chamber 11 is a further conveying line 13, in which the glued fibers are post-dried by means of the supplied hot air. This drying is on this Place required because the glue was added to the fibers water and thus the previously set final moisture was increased by wetting with binder. The feed line 13 downstream of the mixing chamber 11 has a substantially larger diameter D3 than the diameter of the wetting and residence section, so that the transport speed at this point is reduced and the residence time in this section is greater.

Im Anschluss an diesen Abschnitt durchlaufen die beleimten Fasern einen Zyklon und werden anschließend dem Streubunker zugeführt, der einer Formstation zugeordnet ist. Dort werden die beleimten Fasern zu einem Faservlies gestreut und anschließend zu Holzfaserplatten verpresst.Following this section, the glued fibers pass through a cyclone and are subsequently fed to the scattering bunker associated with a forming station. There, the glued fibers are sprinkled to a non-woven fabric and then pressed into wood fiber boards.

Das erfindungsgemäße Verfahren und die Vorrichtung wurde im Zuge der Herstellung von Holzfaserplatten beschrieben. Es ist selbstverständlich das anstelle von Holzfasern auch die eingangs aufgezählten rieselförmigen Güter verwendet werden können.The inventive method and apparatus has been described in the course of the production of wood fiber boards. It goes without saying that, instead of wood fibers, the bulk goods listed at the outset can also be used.

Claims (8)

  1. Process for the wetting with a bonding agent of free-flowing spread materials, in particular fibers, particles, chips made of lignocellulosic and/or cellulosic raw materials or plastic materials, the process having the following procedural steps:
    a) Drying of the free-flowing spread materials to a final moisture of 3 - 20%;
    b) Feeding of the free-flowing spread materials to a conveying line (4);
    c) Pneumatic conveying of the free-flowing spread materials in the conveying line (4) to a wetting section (7);
    d) Increase of the flow velocity of the free-flowing spread materials in a reducing section (8) which is immediately upstream the wetting section (7);
    e) Wetting of the free-flowing spread materials with a bonding agent in the wetting section (7);
    characterized in that the wetting of the free-flowing spread materials is made with increased flow velocity and that the free-flowing spread materials are subsequently dried by means of an added, heated gaseous conveying medium in a conveying line (13).
  2. Process for the wetting of free-flowing spread materials as per patent claim 1, the wetted spread materials being conveyed first through a residence section (10) after having passed the wetting section (7).
  3. Process for the wetting of free-flowing spread materials as per patent claims 1 or 2, the pneumatic conveying being made by means of heated air.
  4. Process for the wetting of free-flowing spread materials as per one of the previous claims, the outside surface of the wetting section (7) being temperature-controllable in such a way that a condensate film is generated on the inner walls.
  5. Device for the wetting with a bonding agent of pneumatically conveyed free-flowing materials, the free-flowing materials being first dried in a drier to final moisture, the dried materials being fed in a conveying line (4) to a wetting section (7), a reduction section (8) being upstream the wetting section (7), and the reduction section causing a cross-section reduction D1 of the conveying line (4) to D2 of the wetting section (7), the wetting section (7) being equipped with a multiplicity of gluing nozzles (9), characterized in that the wetting section (7) has a reduced cross-section D2 over the entire conveying length (L1) and that downstream the wetting section (7) a conveying line (13) is provided in which a subsequent drying of the free-flowing materials is made.
  6. Device for the wetting with a bonding agent of pneumatically conveyed free-flowing materials as per patent claim 5, a residence section (10) being interposed between the wetting section (7) and the conveying line (13).
  7. Device for the wetting with a bonding agent of pneumatically conveyed free-flowing materials as per patent claim 6, the residence section 10) being connected with a mixing chamber (11), the mixing chamber (11) having a feed line (12) for the heated up gaseous conveying medium.
  8. Device for the wetting with a bonding agent of pneumatically conveyed free-flowing materials as per one of the previous claims 5 to 7, the wetting section (7) being made of high-quality polished material and being designed as double-walled tube which has both an inlet and an outlet for a cooling medium.
EP04018258A 2003-08-05 2004-08-02 Method and apparatus for coating pourable materials with a binder Not-in-force EP1504865B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10336533 2003-08-05
DE10336533A DE10336533A1 (en) 2003-08-05 2003-08-05 Method and apparatus for wetting pourable goods with a binder

Publications (3)

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EP1504865A2 EP1504865A2 (en) 2005-02-09
EP1504865A3 EP1504865A3 (en) 2005-05-04
EP1504865B1 true EP1504865B1 (en) 2010-01-13

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EP04018258A Not-in-force EP1504865B1 (en) 2003-08-05 2004-08-02 Method and apparatus for coating pourable materials with a binder

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EP (1) EP1504865B1 (en)
AT (1) ATE454969T1 (en)
DE (2) DE10336533A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NZ530339A (en) * 2004-06-23 2007-01-26 Nz Forest Research Inst Ltd Method for producing wood fibre pellets
DE102008052961B4 (en) * 2008-10-23 2016-07-28 SWISS KRONO Tec AG Process for the manufacture of wood-based materials
DE202008015419U1 (en) 2008-11-21 2010-04-22 Epple, Albrecht, Dr. Device for gluing fibers in a blowpipe
IT1399772B1 (en) 2010-04-30 2013-05-03 Imal Srl APPARATUS FOR THE INJECTION OF CHEMICAL COMPONENTS IN A FLOW OF NON-INCORRENT WOODEN MATERIAL

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2850421A (en) * 1953-03-31 1958-09-02 George F Shea Method for producing reinforced plastic, resinous, or like structural bodies, forms,linings, and coatings
DE1692852B1 (en) * 1966-10-28 1971-06-24 Fiskeby Ab Method and device for treating wood chips
SE461202B (en) * 1988-05-19 1990-01-22 Fredriksson Sven SEAT AND DEVICE MAKE A FIBER PLATE
DE19506353A1 (en) * 1995-02-23 1996-08-29 Schenck Ag Carl Method and device for wetting with a fluid
DE19740676C2 (en) * 1997-09-16 2003-07-17 Fraunhofer Ges Forschung Process for gluing fibers
IT1307924B1 (en) * 1999-01-25 2001-11-29 Cmp Spa GLUING MACHINE FOR PLANTS TO PRODUCE WOOD INFIBRA PANELS.
DE10061072A1 (en) * 2000-12-08 2002-06-13 Flakeboard Company Ltd St Step To coat dry fibers with glue, for the production of fiberboards, they are carried through a shaft against the shaft wall by the centrifugal action from a rotating roller with surface pins, to be sprayed and ejected from the shaft outlet
DE10153593B4 (en) * 2001-11-02 2005-11-17 Fritz Egger Gmbh & Co Apparatus and method for wetting wood fibers with a binder fluid
DE10226820B3 (en) * 2002-06-15 2004-04-01 Flakeboard Company Limited, St.Stephen Method and device for gluing dried fibers intended for the production of fiberboard

Also Published As

Publication number Publication date
EP1504865A2 (en) 2005-02-09
ATE454969T1 (en) 2010-01-15
DE10336533A1 (en) 2005-02-24
EP1504865A3 (en) 2005-05-04
DE502004010630D1 (en) 2010-03-04

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