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EP1504865A2 - 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
EP1504865A2
EP1504865A2 EP04018258A EP04018258A EP1504865A2 EP 1504865 A2 EP1504865 A2 EP 1504865A2 EP 04018258 A EP04018258 A EP 04018258A EP 04018258 A EP04018258 A EP 04018258A EP 1504865 A2 EP1504865 A2 EP 1504865A2
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EP
European Patent Office
Prior art keywords
wetting
section
free
binder
flowing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP04018258A
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German (de)
French (fr)
Other versions
EP1504865A3 (en
EP1504865B1 (en
Inventor
Peter Wolff
Klaus Radzimanowski
Roberto Fasa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SCHENCKMANN-PIEL-Engineering GmbH
Dieffenbacher GmbH and Co KG
Original Assignee
SCHENCKMANN-PIEL-Engineering GmbH
Maschinenfabrik J Dieffenbacher GmbH and Co
Dieffenbacher GmbH and Co KG
Dieffenbacher GmbH Maschinen und Anlagenbau
Priority date (The priority date 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 date listed.)
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Publication of EP1504865A2 publication Critical patent/EP1504865A2/en
Publication of EP1504865A3 publication Critical patent/EP1504865A3/en
Application granted granted Critical
Publication of EP1504865B1 publication Critical patent/EP1504865B1/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 of free-flowing goods with a binder.
  • Giant goods are here in particular lignocellulosic particles such as wood fibers, wood shavings, Wood chips as well as fibers, chips and shavings renewable raw materials such as straw, hemp, bamboo, rice straw and granular plastic materials.
  • the Wetting the fibers with a binder puts in this Manufacturing process is an important step in the process.
  • Die Beleimungssysteme or procedures have the task of the Spread binder evenly 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 by steam pressure through a Transported conveying line while admixed with binder.
  • the glued fibers are then placed in a dryer dried and fed to the further manufacturing process.
  • fiber drying after gluing has the disadvantage a high glue consumption. Because the cost of the glue (Binder) in relation to the cost of the fibers very high are, the high glue consumption represents a drastic increase the cost of production.
  • Another disadvantage of this Gluing process is that when drying the previously glued fibers formaldehyde is released and thereby elaborate dryer exhaust air cleaning measures required are.
  • Object of the present invention is to provide a method and a device for wetting free-flowing goods with a binder in the course of the production of plate-shaped Materials such that a uniform Leimver whatsoever and high reliability achieved becomes.
  • Binder to be wetted gush goods, below Particles, initially dried to final moisture.
  • the dried particles are then transported by means of transport air fed to a wetting section, which is provided with a plurality provided by Beleimungsdüsen.
  • a wetting section which is provided with a plurality provided by Beleimungsdüsen.
  • the Gluing nozzles along the wetting section over the Circumference distributed spirally.
  • Fig. 1 shows a schematic representation of the Device according to the invention for wetting particles in particular of wood fibers with a binder in the course of Production of fiberboard.
  • the previously processed wood fibers are here first fed to a dryer, not shown, in which the Wood fibers to a required for the manufacturing process Final moisture content of about 3 - 20%, preferably 10 - 12%, dried become.
  • a standard Dryer for example, a power dryer and is on This section will not be described in detail dried wood fibers to separate the drying air one Cyclone 1 fed from where they have a feed 2 and a lock 3 are placed in a delivery line 4.
  • the delivery line 4 is by means of a heat exchanger 5 with heated air, which is about 60-120 °, preferably 90 °.
  • heated air serves as transport air and leads the wood fibers along the feed line 4 in the direction of Arrows 6 the wetting section 7 to.
  • the transport air could also Have room temperature.
  • a Reduzierabrough 8 integrated, which a reduction of the diameter D1 of the delivery line 4 a diameter D2 and thus an increase in speed the subsidized wood fibers causes.
  • the at the Reduzierabrough 8 subsequent wetting section 7 is as a pipe section with constant diameter D2 educated.
  • the diameter of the pipe section can be in Conveying direction also slightly smaller or larger be educated.
  • 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 reach the wood fibers when flowing in the wetting section 7 a maximum speed of about 30 - 60 m / s.
  • the number and arrangement of the glue nozzles 9 can ever be adjusted according to glue type and glue content.
  • the glue or the Binder is made by diluting to that for injecting required viscosity brought.
  • the wetting section 7 is made of a high quality polished material to Glue deposits on the inner lateral surface along the Prevent wetting section 7.
  • a residence zone 10 formed, which also serves as a pipe section with the Diameter D2 is formed and a length L2 of about 15 up to 30 meters.
  • This pipe section also exists Made of high quality polished material, so that glue deposits be avoided.
  • the downstream of the wetting zone 7 Indulgence zone 10 serves to further homogenize the Wetting of the fibers.
  • a mixing chamber 11 Following the residence zone 10 is a mixing chamber 11 arranged, which is provided with baffles to a uniform mixing of glued fibers with a additionally effecting supplied airflow.
  • the baffles are parallel spaced running in the conveying direction arranged.
  • the supplied air flow has a temperature of 60-120 ° C, preferably 90 ° C and is a separate Supply line 12 of the mixing chamber 11 is supplied.
  • the mixing chamber 11 downstream is a further delivery line 13, in the the glued fibers by means of the supplied hot air be dried. This drying is on this Required place, because by the Leimzugabe the fibers water supplied and thus the previously set final moisture through wetting with binder was increased.
  • the mixing chamber 11 downstream delivery line 13 has over the Diameter of the wetting and residence section a much larger diameter D3, so the Transport speed is reduced at this point and the residence time in this section is greater.
  • the inventive method and the device was in As part of the production of wood fiber boards described. It is of course that instead of wood fibers and the be used at the beginning enumerated free-flowing goods can.

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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)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Drying Of Solid Materials (AREA)
  • Paper (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

Ein Verfahren zum Benetzen von rieselförmigen Streugütern insbesondere Fasern, Späne, Schnitzel aus lignozellulosehaltigen und/oder zellulosehaltigen Rohstoffen oder Kunststoffen mit einem Bindemittel soll derart weitergebildet werden, dass eine gleichmäßige Leimverteilung sowie eine hohe Betriebssicherheit erreicht wird. Dies wird dadurch erreicht, dass das Benetzen der rieselförmigen Streugüter mit erhöhter Strömungsgeschwindigkeit erfolgt und anschließend die rieselförmigen Streugüter mittels eines zugemischten erhitzten gasförmigen Fördermediums in einer Förderleitung (13) nachgetrocknet werden. <IMAGE>A method for wetting pourable gobs, in particular fibers, chips, chips from lignocellulose-containing and / or cellulose-containing raw materials or plastics with a binder should be developed in such a way that a uniform glue distribution and a high level of operational reliability is achieved. This is achieved in that the wetting of the free-flowing granular materials takes place at an increased flow rate and then the free-flowing granular materials are subsequently dried by means of a premixed heated gaseous medium in a delivery line (13). <IMAGE>

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 of free-flowing goods with a binder. Under Giant goods are here in particular lignocellulosic particles such as wood fibers, wood shavings, Wood chips as well as fibers, chips and shavings renewable raw materials such as straw, hemp, bamboo, rice straw and granular plastic materials.

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 fiberboard, be produced by pressing glued fibers. The Wetting the fibers with a binder puts in this Manufacturing process is an important step in the process. Die Beleimungssysteme or procedures have the task of the Spread binder evenly 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 are the still wet fibers by steam pressure through a Transported conveying line while admixed with binder. The glued fibers are then placed in a dryer dried and fed to the further manufacturing process. The However, fiber drying after gluing has the disadvantage a high glue consumption. Because the cost of the glue (Binder) in relation to the cost of the fibers very high are, the high glue consumption represents a drastic increase the cost of production. Another disadvantage of this Gluing process is that when drying the previously glued fibers formaldehyde is released and thereby elaborate dryer exhaust air cleaning measures required are.

Im Unterschied zur vorstehend beschriebenen Nassbeleimung sind auch einige Vorrichtung und Verfahren zur Trockenbeleimung bekannt.In contrast to the wet gluing described above also some device and method for dry gluing 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 EP 0 728 562 such a method and a Apparatus for dry gluing of pneumatically conveyed Known particles. Here, the wood fibers are first in a dryer to the required final moisture and dried then via a delivery line which is a cross-sectional reduction has fed to a wetting section. Of the Wetting section is provided with glue nozzles. To one to achieve uniform wetting of the particles is the Wetting section formed as a diffuser section, the a Querschnitterweiterung and thus a turbulent flow to cause 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 should be with the above described methods forming fiber aggregates be avoided because these fiber clumps in the Fiberboard surface leads to glue spots and damage can cause 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.Object of the present invention is to provide a method and a device for wetting free-flowing goods with a binder in the course of the production of plate-shaped Materials such that a uniform Leimverteilung and high reliability achieved becomes.

Diese Aufgabe wir durch die im Patentanspruch 1 bzw. Patentanspruch 5 angegebenen Merkmale gelöst. This object we by the in claim 1 or Claim 5 specified features solved.

Gemäß dem erfindungsgemäßen Verfahren werden die mit Bindemittel zu benetzenden rieselförmigen Güter, nachfolgend Partikel genannt, zunächst auf Endfeuchte getrocknet.According to the inventive method are with Binder to be wetted gush goods, below Particles, initially dried to final moisture.

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 transported by means of transport air fed to a wetting section, which is provided with a plurality provided by Beleimungsdüsen. Preferably, the Gluing nozzles along the wetting section over the Circumference distributed spirally.

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 is a Reduction provided, which is a cross-section reduction from D1 of the delivery line to D2 of the wetting section causes.

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 causes in the conveying direction an increase in the speed of the conveyed particle flow. Due to the large number of provided Beleimungsdüsen and the Arrangement of the gluing nozzles along the wetting section as well as the high velocity of the particle flow in the Wetting section will be a good turbulence of the particles and uniform distribution of the binder on the particles reached.

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 avoided, causing 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. Fig. 1 shows a schematic representation of the Device according to the invention for wetting particles in particular of wood fibers with a binder in the course of 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 processed wood fibers are here first fed to a dryer, not shown, in which the Wood fibers to a required for the manufacturing process Final moisture content of about 3 - 20%, preferably 10 - 12%, dried become. Following the dryer, a standard Dryer, for example, a power dryer and is on This section will not be described in detail dried wood fibers to separate the drying air one Cyclone 1 fed from where they have a feed 2 and a lock 3 are placed 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 by means of a heat exchanger 5 with heated air, which is about 60-120 °, preferably 90 °. The heated air serves as transport air and leads the wood fibers along the feed line 4 in the direction of Arrows 6 the wetting section 7 to. 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 is in the Delivery line 4 a Reduzierabschnitt 8 integrated, which a reduction of the diameter D1 of the delivery line 4 a diameter D2 and thus an increase in speed the subsidized wood fibers causes. The at the Reduzierabschnitt 8 subsequent wetting section 7 is as a pipe section with constant diameter D2 educated. The diameter of the pipe section can be in Conveying direction also slightly smaller or larger be educated. 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 reach the wood fibers when flowing in the wetting section 7 a maximum speed of about 30 - 60 m / s.

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 section 7 a Variety about the circumference spirally arranged glue nozzles. 9 intended. The number and arrangement of the glue nozzles 9 can ever be adjusted according to glue type and glue content. The glue or the Binder is made by diluting to that for injecting required viscosity brought. The wetting section 7 is made of a high quality polished material to Glue deposits on the inner lateral surface along the Prevent wetting section 7. Furthermore, the Prevention of caking on the inner surface of the shell Wetting section 7 as a double-walled tube with a Inlet E and an outlet A formed for a cooling medium. The temperature of the cooling medium is adjusted so that a condensate film forms 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.Following the wetting section 7 is a residence zone 10 formed, which also serves as a pipe section with the Diameter D2 is formed and a length L2 of about 15 up to 30 meters. This pipe section also exists Made of high quality polished material, so that glue deposits be avoided. The downstream of the wetting zone 7 Indulgence zone 10 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 is a mixing chamber 11 arranged, which is provided with baffles to a uniform mixing of glued fibers with a additionally effecting supplied airflow. The baffles are parallel spaced running in the conveying direction arranged. The supplied air flow has a temperature of 60-120 ° C, preferably 90 ° C and is a separate Supply line 12 of the mixing chamber 11 is supplied. The mixing chamber 11 downstream is a further delivery line 13, in the the glued fibers by means of the supplied hot air be dried. This drying is on this Required place, because by the Leimzugabe the fibers water supplied and thus the previously set final moisture through wetting with binder was increased. The mixing chamber 11 downstream delivery line 13 has over the Diameter of the wetting and residence section a much larger diameter D3, so the Transport speed is reduced at this point 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 go through the glued Fibers a cyclone and then the scatter bunker fed, which is assigned to a forming station. There will be sprinkled the glued fibers into 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 the device was in As part of the production of wood fiber boards described. It is of course that instead of wood fibers and the be used at the beginning enumerated free-flowing goods can.

Claims (8)

Verfahren zum Benetzen von rieselförmigen Streugütern insbesondere Fasern, Späne, Schnitzel aus lignozellulosehaltigen und/oder zellulosehaltigen Rohstoffen oder Kunststoffen mit einem Bindemittel mit folgenden Verfahrensschritten: a) Trocknen der rieselförmigen Streugüter auf eine Endfeuchte von 3 - 20%; b) Zuführen der rieselförmigen Streugüter einer Förderleitung (4); c) Pneumatisches Fördern der rieselförmigen Streugüter innerhalb der Förderleitung (4) zu einem Benetzungsabschnitt (7); d) Erhöhung der Strömungsgeschwindigkeit der rieselförmigen Streugüter in einem Reduzierabschnitt (8) der dem Benetzungsabschnitt (7) unmittelbar vorgeschaltet ist; e) Benetzen der rieselförmigen Streugüter mit einem Bindemittel in dem Benetzungsabschnitt (7); dadurch gekennzeichnet, dass das Benetzen der rieselförmigen Streugüter mit erhöhter Strömungsgeschwindigkeit erfolgt und anschließend die rieselförmigen Streugüter mittels eines zugemischten erhitzten gasförmigen Fördermediums in einer Förderleitung (13) nachgetrocknet werden. Process for wetting free-flowing bulk materials, in particular fibers, shavings, chips from lignocellulose-containing and / or cellulose-containing raw materials or plastics, using a binder with the following process steps: a) drying the free-flowing granules to a final moisture content of 3 - 20%; b) feeding the free-flowing particles of a delivery line (4); c) pneumatically conveying the free-flowing granular materials within the delivery line (4) to a wetting section (7); d) increasing the flow velocity of the free-flowing granular materials in a reducing section (8) which is immediately upstream of the wetting section (7); e) wetting the pourable gobs with a binder in the wetting section (7); characterized in that the wetting of the free-flowing granular materials takes place at an increased flow rate and then the free-flowing granular materials are subsequently dried by means of a premixed heated gaseous medium in a delivery line (13). Verfahren zum Benetzen von rieselförmigen Streugütern nach Patentanspruch 1, wobei im Anschluß an den Benetzungsabschnitt (7) die benetzten Streugüter zunächst durch einen Verweilabschnitt (10) gefördert werden.Process for wetting free-flowing bulk materials according to claim 1, wherein following the Wetting section (7) the wetted spreading material first be promoted by a residence section (10). Verfahren zum Benetzen von rieselförmigen Streugütern nach Patentanspruch 1 oder 2, wobei das pneumatische Fördern mittels erhitzter Luft erfolgt.Process for wetting free-flowing bulk materials according to claim 1 or 2, wherein the pneumatic Conveying takes place by means of heated air. Verfahren zum Benetzen von rieselförmigen Streugütern nach einem der vorhergehenden Ansprüche, wobei die Mantelfläche des Benetzungsabschnittes (7) derart temperierbar ist, dass sich an der Innenwandung ein Kondensatfilm bildet.Process for wetting free-flowing bulk materials according to one of the preceding claims, wherein the Lateral surface of the wetting section (7) in such a way is temperature-controlled, that on the inner wall a Condensate film forms. Vorrichtung zum Benetzen von pneumatisch geförderten rieselförmigen Gütern mit einem Bindemittel, wobei die rieselförmigen Güter zunächst in einem Trockner auf Endfeuchte getrocknet werden, die getrockneten Güter in einer Förderleitung (4) einem Benetzungsabschnitt (7) zugeführt werden, wobei dem Benetzungsabschnitt (7) ein Reduzierabschnitt (8) vorgeschaltet ist, der eine Querschnittsreduzierung D1 der Förderleitung (4) auf D2 des Benetzungsabschnittes (7) bewirkt, wobei der Benetzungsabschnitt (7) mit einer Vielzahl von Beleimungsdüsen (9) versehen ist, dadurch gekennzeichnet, dass der Benetzungsabschnitt (7) über die gesamte Förderlänge (L1) einen reduzierten Querschnitt D2 aufweist und dass im Anschluss an den Benetzungsabschnitt (7) eine Förderleitung (13) vorsehen ist, in der ein Nachtrocknen der rieselförmigen Güter erfolgt.Apparatus for wetting pneumatically conveyed flowable goods with a binder, wherein the flowable goods are first dried in a dryer to final moisture, the dried goods in a feed line (4) are fed to a wetting section (7), the wetting section (7) a Reduzierabschnitt (8) which brings about a cross-sectional reduction D1 of the delivery line (4) to D2 of the wetting section (7), wherein the wetting section (7) is provided with a plurality of gluing nozzles (9), characterized in that the wetting section (7) over the entire conveying length (L1) has a reduced cross section D2 and that, following the wetting section (7), a conveying line (13) is provided, in which a subsequent drying of the flow-shaped goods takes place. Vorrichtung zum Benetzen von pneumatisch geförderten rieselförmigen Gütern mit einem Bindemittel nach Patentanspruch 5, wobei dem Benetzungsabschnitt (7) und der Förderleitung (13) ein Verweilabschnitt (10) zwischengeschaltet ist.Device for wetting pneumatically conveyed Giant goods with a binder after Claim 5, wherein the wetting section (7) and the delivery line (13) a dwell section (10) is interposed. Vorrichtung zum Benetzen von pneumatisch geförderten rieselförmigen Gütern mit einem Bindemittel nach Patentanspruch 6, wobei der Verweilabschnitt (10) mit einer Mischkammer (11) verbunden ist, und die Mischkammer (11) eine Zuführleitung (12) für ein erhitztes gasförmiges Fördermedium aufweist.Device for wetting pneumatically conveyed Giant goods with a binder after Claim 6, wherein the dwell portion (10) with a mixing chamber (11) is connected, and the mixing chamber (11) a supply line (12) for a heated having gaseous medium. Vorrichtung zum Benetzen von pneumatisch geförderten rieselförmigen Gütern mit einem Bindemittel nach einem der vorhergehenden Ansprüche, wobei der Benetzungsabschnitt (7)aus hochwertigem poliertem Material besteht und als doppelwandiges Rohr ausgebildet ist, das einen Einlass und einen Auslass für ein Kühlmedium aufweist.Device for wetting pneumatically conveyed Giant goods with a binder after one of the preceding claims, wherein the Wetting section (7) made of high quality polished Material exists and designed as a double-walled tube That's an inlet and an outlet for one Has cooling medium.
EP04018258A 2003-08-05 2004-08-02 Method and apparatus for coating pourable materials with a binder Expired - Lifetime EP1504865B1 (en)

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DE10336533A DE10336533A1 (en) 2003-08-05 2003-08-05 Method and apparatus for wetting pourable goods with a binder

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EP2179826A1 (en) * 2008-10-23 2010-04-28 Kronotec Ag Device and method for manufacturing wooden materials
EP2563558A1 (en) 2010-04-30 2013-03-06 Imal S.R.L. Apparatus for injecting chemical components into a flow of loose wooden material

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WO2006001717A1 (en) * 2004-06-23 2006-01-05 New Zealand Forest Research Institute Limited Method for producing wood fibre pellets
US9511508B2 (en) 2004-06-23 2016-12-06 New Zealand Forest Research Institute Limited Method for producing wood fibre pellets
EP2179826A1 (en) * 2008-10-23 2010-04-28 Kronotec Ag Device and method for manufacturing wooden materials
DE102008052961B4 (en) * 2008-10-23 2016-07-28 SWISS KRONO Tec AG Process for the manufacture of wood-based materials
EP2563558A1 (en) 2010-04-30 2013-03-06 Imal S.R.L. Apparatus for injecting chemical components into a flow of loose wooden material
EP2563558B1 (en) 2010-04-30 2018-06-20 Imal S.R.L. Apparatus for injecting chemical components into a flow of loose wooden material

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ATE454969T1 (en) 2010-01-15
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DE10336533A1 (en) 2005-02-24
DE502004010630D1 (en) 2010-03-04

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