WO1996038625A1 - Process and plant for crushing a cellulose material - Google Patents
Process and plant for crushing a cellulose material Download PDFInfo
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- WO1996038625A1 WO1996038625A1 PCT/AT1996/000064 AT9600064W WO9638625A1 WO 1996038625 A1 WO1996038625 A1 WO 1996038625A1 AT 9600064 W AT9600064 W AT 9600064W WO 9638625 A1 WO9638625 A1 WO 9638625A1
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- cellulose
- cellulosic material
- comminuted
- pulp
- crushing
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/06—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods
- D21B1/066—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods the raw material being pulp sheets
Definitions
- the invention relates to a method and a plant for comminuting a cellulosic material, in particular for comminuting pulp.
- NMMO N-Methylmorpholine-N-oxide
- Other amine oxides are e.g. in EP-A - 0 553 070.
- a method of making moldable cellulose solutions is e.g. known from EP-A-0 356 419.
- the production of cellulosic moldings using tertiary amine oxides is generally referred to as the amine oxide process.
- EP-A-0 356 419 describes an amine oxide process for producing spinnable cellulose solutions, which uses, among other things, a suspension of cellulose in liquid, aqueous N-methylmorpholine-N-oxide (NMMO) as the starting material.
- NMMO N-methylmorpholine-N-oxide
- This method consists in the suspension being continuously and continuously converted into a moldable solution in a thin-film treatment apparatus.
- the moldable solution is finally spun in a molding tool, for example a spinneret, into filaments which are passed through a precipitation bath.
- a suspension of cellulose in the aqueous, tertiary amine oxide serves as the starting material for the production of the moldable cellulose solution.
- This suspension is produced by crushing cellulose and introducing it into the aqueous amine oxide solution in a mixer.
- WO 94/28217 discloses a process for producing a premix based on comminuted cellulose, from which a moldable cellulose solution can be produced.
- Cellulose in roll form serves as the starting material.
- the pulp is comminuted in a cutting device, and the comminuted pulp is blown by air into a pulp separator in which the comminuted pulp is separated into two fractions: a first fraction, which has a particle size of at most 2.54 mm, and one Dust fraction.
- the dust fraction is entrained by the conveying air and only separated from it in a filter.
- the filtered dust fraction is then combined again with the first fraction and used to produce the cellulose suspension.
- the object of the invention is therefore to provide a method and a system with which the disadvantages mentioned above can be overcome.
- the cellulosic material is pre-crushed to form particles of different size fractions
- the particles formed in the pre-comminution are transported without separation of any size fraction to a device in which the particles are further comminuted.
- the particles formed in the pre-comminution are best transported using a gas.
- the process according to the invention is preferably carried out continuously.
- the process according to the invention can advantageously be used to form a comminuted cellulosic material which is particularly suitable for the preparation of a suspension of cellulose in an aqueous tertiary amine oxide for the amine oxide process.
- the invention also relates to a plant for carrying out the method according to the invention, which plant is characterized by the following features:
- a conveying line for pre-comminuted cellulosic material which connects the first device and the at least one further device to one another, with the proviso that no branch is provided in the conveying line for pre-comminuted, cellulosic material.
- a preferred embodiment of the plant according to the invention is that a discharge chute is provided which is in the first device for pre-shredding cellulosic Material opens out, and that means are provided with which cellulose in sheet form or cellulose in roll form can be introduced into the discharge chute.
- Two devices for comminuting cellulosic material are advantageously provided in the plant according to the invention.
- FIG. 1 shows an embodiment of the device according to the invention with a two-stage pulp comminution.
- the reference number 1 denotes cellulose in sheet form (800 mm ⁇ 600 mm), which is transported with a conveyor belt 3 in a direction which is indicated by an arrow above the cellulose pulp 1.
- the motor for driving the conveyor belt is not shown.
- the cellulose sheets 1 are thrown into the discharge chute 6 as required and from the granulator 9 (type Condux CS 500/1000; screen perforation> 0.75 mm ) pre-shredded. In this way, pulp is fed intermittently.
- the chute 6 is also fed pulp in roll form (800 mm wide).
- pulp is drawn off the roll 2a from a feed device 10, which essentially consists of two conveying rollers which are driven by a motor (not shown), and into the Conveying shaft 6 is introduced. In this way, pulp can be fed continuously.
- a second roll 2b with cellulose can be provided, from which cellulose can be removed while the roll 2a is being replaced.
- the reference numerals 7 and 8 denote metal detectors with which it can be determined whether there are metal pieces in the pulp, for example residues of metal strips, which are usually used for packaging the pulp. If pieces of metal are detected, the metal detectors switch off the granulator 9 and the conveyor belt 3 or the feed device 10 in order to prevent the knives of the granulator 9 from being damaged.
- the pulp pre-shredded in the granulator 9 enters the pipeline 12 (diameter: 150 mm), where it is caught by an air flow which is generated by the fan 11.
- the air flow is expediently set to a value between 20 and 25 m / s with the fan 11, the loading of the air flow with pre-comminuted pulp depending on the particle size being between 0.25 and 2.5 kg / m 3 of air.
- the pre-comminuted pulp is blown by the air flow into the cyclone 13, in which the pre-comminuted pulp settles out of the conveying gas.
- the feed gas is fed via line 14 into the discharge chute 6.
- the pre-shredded pulp enters the second granulator 15 (CS 500/1000; perforated screen ⁇ 20 mm), in which the pre-shredded pulp is further shredded to the desired particle size.
- the shredded pulp finally reaches the delivery line 16 in which the pulp is entrained by the air flow generated by a fan 17 and can be conveyed, for example, into a storage container (not shown).
- the two-stage shredding of the pulp not only enables the shredding performance of the two granulators to be better coordinated, it also prevents damage to the cellulose. It has also been found that a pulp dosage e.g. in a mixer, in which the comminuted pulp is introduced into the aqueous, tertiary amine oxide and the cellulose suspension is produced, is easier and more precisely possible.
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- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Textile Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Disintegrating Or Milling (AREA)
- Saccharide Compounds (AREA)
- Artificial Filaments (AREA)
- Paper (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
Abstract
Description
Verfahren und Anlage zum Zerkleinern eines cellulosischen MaterialsProcess and plant for crushing a cellulosic material
Die Erfindung betrifft ein Verfahren und eine Anlage zum Zerkleinern eines cellulosischen Materials, insbesondere zum Zerkleinern von Zellstoff.The invention relates to a method and a plant for comminuting a cellulosic material, in particular for comminuting pulp.
Seit einigen Jahrzehnten wird nach Verfahren zur Herstellung cellulosischer Formkörper gesucht, welche das heute in großem Maßstab angewendete Viskoseverfahren ersetzen sollen. Als eine nicht zuletzt wegen einer besseren Umweltverträglichkeit interessante Alternative hat sich dabei herauskristallisiert, Cellulose ohne Derivatisierung in einem organischen Lösungsmittel aufzulösen und aus dieser Lösung Formkörper, z.B. Fasern, Folien und anderen Formkörpern, zu extrudieren. Solcherart extrudierte Fasern erhielten von der BISFA (The International Bureau for the Standardization of man ade fibers) den Gattungsnamen Lyocell. Unter einem organischen Lösungsmittel wird von der BISFA ein Gemisch aus einer organischen Chemikalie und Wasser verstanden.For several decades, processes for the production of cellulosic molded articles have been sought which are to replace the viscose process which is used today on a large scale. An alternative, not least because of its better environmental compatibility, has emerged in the process of dissolving cellulose in an organic solvent without derivatization and molding, e.g. Fibers, foils and other moldings to extrude. Such extruded fibers were given the generic name Lyocell by BISFA (The International Bureau for the Standardization of man ade fibers). BISFA defines an organic solvent as a mixture of an organic chemical and water.
Es hat sich herausgestellt, daß sich als organisches Lösungsmittel insbesondere ein Gemisch aus einem tertiären Aminoxid und Wasser sehr gut zur Herstellung von cellulosischen Formkörpern eignet. Als Aminoxid wird dabei in erster Linie N-Methylmorpholin-N-oxid (NMMO) verwendet. Andere Aminoxide sind z.B. in der EP-A - 0 553 070 beschrieben. Ein Verfahren zur Herstellung formbarer Celluloselösungen ist z.B. aus der EP-A - 0 356 419 bekannt. Die Herstellung cellulosischer Formkörper unter Anwendung tertiärer Aminoxide wird allgemein als Aminoxidverfahren bezeichnet.It has been found that a mixture of a tertiary amine oxide and water is particularly suitable as an organic solvent for the production of cellulosic moldings. N-Methylmorpholine-N-oxide (NMMO) is primarily used as the amine oxide. Other amine oxides are e.g. in EP-A - 0 553 070. A method of making moldable cellulose solutions is e.g. known from EP-A-0 356 419. The production of cellulosic moldings using tertiary amine oxides is generally referred to as the amine oxide process.
In der EP-A - 0 356 419 ist ein Aminoxidverfahren zur Herstellung spinnbarer Celluloselösungen beschrieben, welches als Ausgangsmaterial u.a. eine Suspension von Cellulose in flüssigem, wäßrigem N-Methylmorpholin-N-oxid (NMMO) verwendet. Dieses Verfahren besteht darin, daß die Suspension in einem Dünnschichtbehandlungsapparat einstufig und kontinuierlich in eine formbare Lösung übergeführt wird. Die formbare Lösung wird schließlich in einem Formwerkzeug, z.B einer Spinndüse, zu Filamenten versponnen, die durch ein Fällbad geführt werden.EP-A-0 356 419 describes an amine oxide process for producing spinnable cellulose solutions, which uses, among other things, a suspension of cellulose in liquid, aqueous N-methylmorpholine-N-oxide (NMMO) as the starting material. This method consists in the suspension being continuously and continuously converted into a moldable solution in a thin-film treatment apparatus. The moldable solution is finally spun in a molding tool, for example a spinneret, into filaments which are passed through a precipitation bath.
Als Ausgangsmaterial für die Herstellung der formbaren Celluloselösung dient, wie oben erwähnt, eine Suspension von Cellulose im wäßrigen, tertiären Aminoxid. Diese Suspension wird hergestellt, indem Cellulose zerkleinert und in einem Mischer in die wäßrige Aminoxidlösung eingebracht wird.As mentioned above, a suspension of cellulose in the aqueous, tertiary amine oxide serves as the starting material for the production of the moldable cellulose solution. This suspension is produced by crushing cellulose and introducing it into the aqueous amine oxide solution in a mixer.
Aus der WO 94/28217 ist ein Verfahren zur Herstellung einer Vormischung auf Basis von zerkleinertem Zellstoff bekannt, aus welcher eine formbare Celluloselösung hergestellt werden kann. Als Ausgangsmaterial dient Zellstoff in Rollenform. Der Zellstoff wird in einer Schneidevorrichtung zerkleinert, und der zerkleinerte Zellstoff wird mittels Luft in einen Zellstoffseparator geblasen, in welchem der zerkleinerte Zellstoff in zwei Fraktionen getrennt wird: in eine erste Fraktion, die eine Teilchengröße von maximal 2,54 mm aufweist, und in eine Staubfraktion. Die Straubfraktion wird von der Förderluft mitgerissen und erst in einem Filter von dieser getrennt. Anschließend wird die abfiltrierte Staubfraktion wieder mit der ersten Fraktion vereinigt und zur Herstellung der Cellulosesuspension verwendet.WO 94/28217 discloses a process for producing a premix based on comminuted cellulose, from which a moldable cellulose solution can be produced. Cellulose in roll form serves as the starting material. The pulp is comminuted in a cutting device, and the comminuted pulp is blown by air into a pulp separator in which the comminuted pulp is separated into two fractions: a first fraction, which has a particle size of at most 2.54 mm, and one Dust fraction. The dust fraction is entrained by the conveying air and only separated from it in a filter. The filtered dust fraction is then combined again with the first fraction and used to produce the cellulose suspension.
Dieses vorbekannte Verfahren besitzt den Nachteil, daß als Ausgangsmaterial Rollenzellstoff und kein Zellstoff in Blattform verwendet wird. Zellstoff in Blattform ist schwieriger zu verarbeiten, da die einzelnen Zellstoffballen mit Metallbändern verpackt sind und durch diese Metallbänder Verformungen der Außenränder der Blätter verursacht werden. Diese Verformungen wiederum führen zu einer gewissen mechanischen Verbindung der einzelnen Blätter, wodurch eine gleichmäßige Zuführung zur Zerkleinerungsvorrichtung nur schwierig erreicht werden kann. Eine ungleichmäßige Zuführung wiederum bedeutet eine ungleichmäßige Belastung des Antriebs der Zerkleinerungsvorrichtung. Andererseits wäre eine Verwendung von Blattzellstoff zweckmäßiger, da dieser im Gegensatz zu Rollenzellstoff besser verfügbar ist und leichter transportiert werden kann.This previously known method has the disadvantage that roll pulp and no cellulose in sheet form is used as the starting material. Sheet pulp is more difficult to process because the individual bales of cellulose are packed with metal strips and these metal strips cause deformations of the outer edges of the sheets. These deformations in turn lead to a certain mechanical connection of the individual leaves, which results in a uniform supply to the shredding device can be achieved only with difficulty. An uneven feed in turn means an uneven load on the drive of the shredding device. On the other hand, the use of leaf pulp would be more appropriate since, in contrast to roller pulp, it is more readily available and can be transported more easily.
Ein weiterer Nachteil des aus der oben gennanten WO 94/28217 vorbekannten Verfahrens besteht darin, daß der zerkleinerte Zellstoff in zwei Fraktionen aufgetrennt werden muß, was naturgemäß den technischen Aufwand der Anlage erhöht.Another disadvantage of the process known from WO 94/28217 mentioned above is that the pulverized pulp has to be separated into two fractions, which naturally increases the technical complexity of the plant.
Die Erfindung stellt sich daher die Aufgabe, ein Verfahren und eine Anlage zur Verfügung zu stellen, mit welcher die oben genannten Nachteile überwunden werden können.The object of the invention is therefore to provide a method and a system with which the disadvantages mentioned above can be overcome.
Das erfindungsgemäße Verfahren zur Zerkleinerung eines cellulosischen Materials ist dadurch gekennzeichnet, daß die Zerkleinerung mindestens zweistufig durchgeführt wird, indemThe process according to the invention for comminuting a cellulosic material is characterized in that the comminution is carried out at least in two stages by
(1) das cellulosische Material vorzerkleinert wird, wobei Teilchen verschiedener Größenfraktionen gebildet werden, und(1) the cellulosic material is pre-crushed to form particles of different size fractions, and
(2) die bei der Vorzerkleinerung gebildeten Teilchen ohne Abtrennung irgendeiner Größenfraktion zu einer Vorrichtung transportiert werden, in welcher die Teilchen weiter zerkleinert werden.(2) the particles formed in the pre-comminution are transported without separation of any size fraction to a device in which the particles are further comminuted.
Es hat sich gezeigt, daß mit einer mindestens zweistufigen Zerkleinerung eine schonendere Zerkleinerung der Cellulose und eine gleichmäßige Belastung der Zerkleinerungsvorrichtungen erreicht werden können. Ferner ist es möglich, Blattzellstoff zu verarbeiten. Auch Zellstoffmischungen können eingesetzt werden. Als das cellulosische Material wird bevorzugt Zellstoff eingesetzt.It has been shown that more gentle crushing of the cellulose and uniform loading of the crushing devices can be achieved with at least two-stage crushing. It is also possible to process leaf pulp. Cellulose mixtures can also be used. Cellulose is preferably used as the cellulosic material.
Im erfindungsgemäßen Verfahren werden die bei der Vorzerkleinerung gebildeten Teilchen am besten mittels eines Gases transportiert.In the process according to the invention, the particles formed in the pre-comminution are best transported using a gas.
Das erfindungsgemäße Verfahren wird bevorzugt kontinuierlich ausgeführt.The process according to the invention is preferably carried out continuously.
Es hat sich ferner gezeigt, daß mit dem erfindungsgemäßen Verfahren vorteilhaft ein zerkleinertes, cellulosisches Material gebildet werden kann, welches sich zur Herstellung einer Suspension von Cellulose in einem wäßrigen tertiären Aminoxid für das Aminoxidverfahren besonders gut eignet.It has also been found that the process according to the invention can advantageously be used to form a comminuted cellulosic material which is particularly suitable for the preparation of a suspension of cellulose in an aqueous tertiary amine oxide for the amine oxide process.
Die Erfindung betrifft auch eine Anlage zur Durchführung des erfindungsgemäßen Verfahrens, welche Anlage gekennzeichnet ist durch folgende Merkmale:The invention also relates to a plant for carrying out the method according to the invention, which plant is characterized by the following features:
(1) eine erste Vorrichtung zum Vorzerkleinern eines cellulosischen Materials,(1) a first device for pre-shredding a cellulosic material,
(2) mindestens eine weitere Vorrichtung zum weiteren Zerkleinern des vorzerkleinerten, cellulosischen Materials, und(2) at least one further device for further comminuting the pre-comminuted cellulosic material, and
(3) eine Förderleitung für vorzerkleinertes, cellulosisches Material, welche die erste Vorrichtung und die mindestens eine weitere Vorrichtung miteinander verbindet, mit der Maßgabe, daß in der Förderleitung keine Abzweigung für vorzerkleinertes, cellulosisches Material vorgesehen ist.(3) a conveying line for pre-comminuted cellulosic material, which connects the first device and the at least one further device to one another, with the proviso that no branch is provided in the conveying line for pre-comminuted, cellulosic material.
Eine bevorzugte Ausführungsform der erfindungsgemäßen Anlage besteht darin, daß ein AbwurfSchacht vorgesehen ist, der in die erste Vorrichtung zur Vorzerkleinerung von cellulosischem Material mündet, und daß Mittel vorgesehen sind, mit welchen Zellstoff in Blattform bzw. Zellstoff in Rollenform in den AbwurfSchacht eingebracht werden können.A preferred embodiment of the plant according to the invention is that a discharge chute is provided which is in the first device for pre-shredding cellulosic Material opens out, and that means are provided with which cellulose in sheet form or cellulose in roll form can be introduced into the discharge chute.
Vorteilhafterweise sind in der erfindungsgemäßen Anlage zwei Vorrichtungen zur Zerkleinerung von cellulosischem Material vorgesehen.Two devices for comminuting cellulosic material are advantageously provided in the plant according to the invention.
Es hat sich als zweckmäßig erwiesen, in die Förderleitung einen Zyklon zu schalten, um das vorzerkleinerte, cellulosische Material von der Frischluft abzutrennen.It has proven to be expedient to switch a cyclone into the delivery line in order to separate the pre-shredded, cellulosic material from the fresh air.
Eine bevorzugte Ausführungsform der Erfindung wird mit der beigefügten Zeichnung noch näher erläutert. Die Zeichnung zeigt eine Ausführungsform der erfindungsgemäßen Vorrichtung mit einer zweistufigen Zerkleinerung von Zellstoff.A preferred embodiment of the invention is explained in more detail with the accompanying drawing. The drawing shows an embodiment of the device according to the invention with a two-stage pulp comminution.
Als Ausgangsmaterial wird Zellstoff in Blattform als auch in Rollenform eingesetzt. Mit der Bezugsziffer 1 wird Zellstoff in Blattform (800 mm x 600 mm) bezeichnet, der mit einem Förderband 3 in eine Richtung transportiert wird, die in der Figur über dem Blattzellstoff 1 mit einem Pfeil angedeutet ist. Der Motor zum Antrieb des Förderbandes ist nicht gezeigt. Mittels einer Halte- und Stoßvorrichtung, die in der Figur mit den Bezugszeichen 4 und 5 angedeutet ist, werden die Zellstoffblätter 1 je nach Bedarf in den AbwurfSchacht 6 geworfen und vom Granulator 9 (type Condux CS 500/1000; Sieblochung > 0,75 mm) vorzerkleinert. Auf diese Weise wird Zellstoff diskontinuierlich zugeführt.Cellulose in sheet form and in roll form is used as the starting material. The reference number 1 denotes cellulose in sheet form (800 mm × 600 mm), which is transported with a conveyor belt 3 in a direction which is indicated by an arrow above the cellulose pulp 1. The motor for driving the conveyor belt is not shown. By means of a holding and pushing device, which is indicated in the figure with the reference numerals 4 and 5, the cellulose sheets 1 are thrown into the discharge chute 6 as required and from the granulator 9 (type Condux CS 500/1000; screen perforation> 0.75 mm ) pre-shredded. In this way, pulp is fed intermittently.
Dem AbwurfSchacht 6 wird ferner Zellstoff in Rollenform (800 mm breit) zugeführt. In der Figur ist gezeigt, daß Zellstoff von der Rolle 2a von einer Einzugsvorrichtung 10, die im wesentlichen aus zwei Fδrderwalzen besteht, die von einem Motor (nicht gezeigt) angetrieben werden, abgezogen und in den Förderschacht 6 eingebracht wird. Auf diese Weise kann Zellstoff kontiuierlich zugeführt werden.The chute 6 is also fed pulp in roll form (800 mm wide). In the figure it is shown that pulp is drawn off the roll 2a from a feed device 10, which essentially consists of two conveying rollers which are driven by a motor (not shown), and into the Conveying shaft 6 is introduced. In this way, pulp can be fed continuously.
Um eine Unterbrechung bei einem etwaigen Rollenwechsel zu verhindern, kann eine zweite Rolle 2b mit Zellstoff vorgesehen sein, von welcher Zellstoff abgezogen werden kann, während die Rolle 2a ersetzt wird.In order to prevent an interruption in the event of a possible roll change, a second roll 2b with cellulose can be provided, from which cellulose can be removed while the roll 2a is being replaced.
Mit den Bezugszeichen 7 und 8 sind Metalldetektoren bezeichnet, mit denen festgestellt werden kann, ob im Zellstoff Metallstücke, beispielsweise Reste von Metallbändern, die üblicherweise zum Verpacken des Zellstoffs verwendet werden, vorhanden sind. Werden Metallstücke detektiert, schalten die Metalldetektoren den Granulator 9 und das Förderband 3 bzw. die Einzugsvorrichtung 10 ab, um zu verhindern, daß die Messer des Granulators 9 beschädigt werden.The reference numerals 7 and 8 denote metal detectors with which it can be determined whether there are metal pieces in the pulp, for example residues of metal strips, which are usually used for packaging the pulp. If pieces of metal are detected, the metal detectors switch off the granulator 9 and the conveyor belt 3 or the feed device 10 in order to prevent the knives of the granulator 9 from being damaged.
Der im Granulator 9 vorzerkleinerte Zellstoff gelangt in die Rohrleitung 12 (Durchmesser: 150 mm) , wird dort von einem Luftstrom erfaßt, der vom Ventilator 11 erzeugt wird. Der Luftström wird mit dem Ventilator 11 zweckmäßigerweise auf einen Wert zwischen 20 und 25 m/s eingestellt, wobei die Beladung des Luftstroms mit vorzerkleinertem Zellstoff je nach Teilchengröße zwischen 0,25 und 2,5 kg/m3 Luft betragen kann.The pulp pre-shredded in the granulator 9 enters the pipeline 12 (diameter: 150 mm), where it is caught by an air flow which is generated by the fan 11. The air flow is expediently set to a value between 20 and 25 m / s with the fan 11, the loading of the air flow with pre-comminuted pulp depending on the particle size being between 0.25 and 2.5 kg / m 3 of air.
Der vorzerkleinerte Zellstoff wird vom Luftstrom in den Zyklon 13 geblasen, in welchem sich der vorzerkleinerte Zellstoff vom Fördergas absetzt. Das Fördergas wird über die Leitung 14 in den Abwurfschacht 6 geführt.The pre-comminuted pulp is blown by the air flow into the cyclone 13, in which the pre-comminuted pulp settles out of the conveying gas. The feed gas is fed via line 14 into the discharge chute 6.
Vom Zyklon 13 gelangt der vorzerkleinerte Zellstoff in den zweiten Granulator 15 (CS 500/1000; Sieblochung < 20 mm), in welchem der vorzerkleinerte Zellstoff auf die gewünschte Teilchengröße weiter zerkleinert wird. Der zerkleinerte Zellstoff gelangt schließlich in die Förderleitung 16, in welcher der Zellstoff vom Luftstrom, der von einem Ventilator 17 erzeugt wird, mitgerissen und beispielsweise in einen Vorratsbehälter (nicht gezeigt) gefördert werden kann.From the cyclone 13, the pre-shredded pulp enters the second granulator 15 (CS 500/1000; perforated screen <20 mm), in which the pre-shredded pulp is further shredded to the desired particle size. The shredded pulp finally reaches the delivery line 16 in which the pulp is entrained by the air flow generated by a fan 17 and can be conveyed, for example, into a storage container (not shown).
Durch die zweistufige Zerkleinerung des Zellstoffes kann nicht nur die Zerkleinerungsleistungen der beiden Granulatoren besser aufeinander abgestimmt werden, es wird auch eine Schädigung der Cellulose verhindert. Es hat sich ferner gezeigt, daß eine Zellstoffdosierung z.B. in einen Mischer, in welchem der zerkleinerte Zellstoff in das wäßrige, tertiäre Aminoxid eingebracht und die Cellulosesuspension hergestellt wird, leichter und genauer möglich ist. The two-stage shredding of the pulp not only enables the shredding performance of the two granulators to be better coordinated, it also prevents damage to the cellulose. It has also been found that a pulp dosage e.g. in a mixer, in which the comminuted pulp is introduced into the aqueous, tertiary amine oxide and the cellulose suspension is produced, is easier and more precisely possible.
Claims
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP96908908A EP0767848B1 (en) | 1995-05-30 | 1996-04-02 | Plant for crushing a cellulose material |
| BR9606401A BR9606401A (en) | 1995-05-30 | 1996-04-02 | Process and installation for crushing a cellulosic material |
| JP8536022A JPH10503562A (en) | 1995-05-30 | 1996-04-02 | Process and plant for crushing cellulosic material |
| DE59602474T DE59602474D1 (en) | 1995-05-30 | 1996-04-02 | PLANT FOR CRUSHING A CELLULOSIC MATERIAL |
| AU52601/96A AU5260196A (en) | 1995-05-30 | 1996-04-02 | Process and plant for crushing a cellulose material |
| AT96908908T ATE182378T1 (en) | 1995-05-30 | 1996-04-02 | SYSTEM FOR SHREDDING A CELLULOSIC MATERIAL |
| NO970364A NO970364D0 (en) | 1995-05-30 | 1997-01-28 | Process and plant for comminution of cellulose material |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0091095A AT402306B (en) | 1995-05-30 | 1995-05-30 | METHOD AND SYSTEM FOR CRUSHING A CELLULOSIC MATERIAL |
| ATA910/95 | 1995-05-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1996038625A1 true WO1996038625A1 (en) | 1996-12-05 |
Family
ID=3502658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/AT1996/000064 Ceased WO1996038625A1 (en) | 1995-05-30 | 1996-04-02 | Process and plant for crushing a cellulose material |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0767848B1 (en) |
| JP (1) | JPH10503562A (en) |
| AT (2) | AT402306B (en) |
| AU (1) | AU5260196A (en) |
| BR (1) | BR9606401A (en) |
| CA (1) | CA2195409A1 (en) |
| DE (1) | DE59602474D1 (en) |
| NO (1) | NO970364D0 (en) |
| WO (1) | WO1996038625A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7364681B2 (en) | 2002-01-08 | 2008-04-29 | Stefan Zikeli | Spinning device and method having cooling by blowing |
| US7614864B2 (en) | 2002-01-28 | 2009-11-10 | Stefan Zikeli | Ergonomic spinning system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4596520B2 (en) * | 2004-08-25 | 2010-12-08 | 株式会社リブドゥコーポレーション | Pulp crusher |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3692246A (en) * | 1971-06-14 | 1972-09-19 | Williams Patent Crusher & Pulv | Fluff preparation system and apparatus |
| WO1994028233A1 (en) * | 1993-05-24 | 1994-12-08 | Courtaulds Fibres (Holdings) Limited | Improvement in comminuting wood pulp sheeting |
-
1995
- 1995-05-30 AT AT0091095A patent/AT402306B/en not_active IP Right Cessation
-
1996
- 1996-04-02 EP EP96908908A patent/EP0767848B1/en not_active Revoked
- 1996-04-02 AT AT96908908T patent/ATE182378T1/en active
- 1996-04-02 JP JP8536022A patent/JPH10503562A/en active Pending
- 1996-04-02 DE DE59602474T patent/DE59602474D1/en not_active Expired - Fee Related
- 1996-04-02 AU AU52601/96A patent/AU5260196A/en not_active Abandoned
- 1996-04-02 WO PCT/AT1996/000064 patent/WO1996038625A1/en not_active Ceased
- 1996-04-02 BR BR9606401A patent/BR9606401A/en not_active Application Discontinuation
- 1996-04-02 CA CA002195409A patent/CA2195409A1/en not_active Abandoned
-
1997
- 1997-01-28 NO NO970364A patent/NO970364D0/en unknown
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3692246A (en) * | 1971-06-14 | 1972-09-19 | Williams Patent Crusher & Pulv | Fluff preparation system and apparatus |
| WO1994028233A1 (en) * | 1993-05-24 | 1994-12-08 | Courtaulds Fibres (Holdings) Limited | Improvement in comminuting wood pulp sheeting |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7364681B2 (en) | 2002-01-08 | 2008-04-29 | Stefan Zikeli | Spinning device and method having cooling by blowing |
| US7614864B2 (en) | 2002-01-28 | 2009-11-10 | Stefan Zikeli | Ergonomic spinning system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10503562A (en) | 1998-03-31 |
| AU5260196A (en) | 1996-12-18 |
| ATE182378T1 (en) | 1999-08-15 |
| EP0767848A1 (en) | 1997-04-16 |
| ATA91095A (en) | 1996-08-15 |
| BR9606401A (en) | 1997-12-23 |
| EP0767848B1 (en) | 1999-07-21 |
| NO970364L (en) | 1997-01-28 |
| DE59602474D1 (en) | 1999-08-26 |
| NO970364D0 (en) | 1997-01-28 |
| CA2195409A1 (en) | 1996-12-05 |
| AT402306B (en) | 1997-04-25 |
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