EP0070782B1 - Verfahren zur Herstellung eines Cellulosefaserstoffbreis für nicht papierähnliche Anwendungen - Google Patents

Verfahren zur Herstellung eines Cellulosefaserstoffbreis für nicht papierähnliche Anwendungen Download PDF

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Publication number
EP0070782B1
EP0070782B1 EP82401346A EP82401346A EP0070782B1 EP 0070782 B1 EP0070782 B1 EP 0070782B1 EP 82401346 A EP82401346 A EP 82401346A EP 82401346 A EP82401346 A EP 82401346A EP 0070782 B1 EP0070782 B1 EP 0070782B1
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EP
European Patent Office
Prior art keywords
pitch
pulping
pulp
fibres
reverse
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
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EP82401346A
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English (en)
French (fr)
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EP0070782A1 (de
Inventor
Pierre Berger
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Clextral SAS
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Clextral SAS
Creusot Loire SA
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Publication date
Application filed by Clextral SAS, Creusot Loire SA filed Critical Clextral SAS
Priority to AT82401346T priority Critical patent/ATE15918T1/de
Publication of EP0070782A1 publication Critical patent/EP0070782A1/de
Application granted granted Critical
Publication of EP0070782B1 publication Critical patent/EP0070782B1/de
Expired legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/22—Extrusion presses; Dies therefor
    • B30B11/24—Extrusion presses; Dies therefor using screws or worms
    • B30B11/246—Screw constructions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/22—Extrusion presses; Dies therefor
    • B30B11/24—Extrusion presses; Dies therefor using screws or worms
    • B30B11/243—Extrusion presses; Dies therefor using screws or worms using two or more screws working in the same chamber
    • 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
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means

Definitions

  • the subject of the invention is a method and an installation for manufacturing a pulp of cellulosic fibers which can be used especially in non-paper fields without any treatment other than drying.
  • the chips can be disaggregated purely mechanically by means of grinding wheels, for example.
  • the so-called mechanical pastes are then obtained.
  • the chips undergo cooking for a fairly long time in devices called digesters allowing the reagent to attack the ligin which dissolves in the liquid phase.
  • the so-called chemical pulps are obtained which are easily disintegrated, for example by blowing with compressed air.
  • the paste obtained at the end of the defibration treatment is in the form of a very dilute suspension which must be washed, bleached and then wrung out.
  • the Depositing Company has been developing for a few years a new process and a new machine for defibrating wood chips.
  • This machine described, in particular in French patent no. 2319737 comprises at least two identical threaded screws meshing in one another and rotated inside a sheath provided with an upstream inlet orifice for the chips and a downstream outlet for the defibrated material; the threads of the screws have varied pitches which determine a succession of treatment zones each comprising a direct pitch section in which the material is entrained downstream and an inverted pitch section which slows down the advancement of the material and consequently determines an increase in pressure.
  • the nets are however provided with windows allowing the passage downstream of a certain quantity of material.
  • the widths of the windows are adjusted so as to keep the material insufficiently upstream.
  • the material having reached the desired degree of defibration, most of the defibration work being obtained by a combination of compression and shearing effects in the compressed areas, in particular due to the fact that, in these zones, the material is entrained around the threads passing from one screw to another. It is thus possible to progressively defiberate the chips by reducing the width of the windows from one braking zone to the next.
  • correct defibration is obtained by passing through three or four sections with reverse pitch.
  • an important advantage lies in the fact that it is possible to carry out, inside the same machine, the bleaching of the dough during the defibration of the chips as well as the broad and a wringing to a degree at least 35% dryness.
  • washing of the dough is carried out at the same time as defibration, in the successive zones of the machine.
  • This therefore includes a number of successive defibration zones comprising a compression section and an inverted pitch section, and the sheath surrounding the screws is provided with filtering zones in the parts preceding the inverted pitch sections. It is in fact observed that the liquid phase which is expressed in the compression zones can go upstream in the less compressed zones, passing between the periphery of the threads and the internal wall of the sheath to the filtering zones where it is discharged.
  • the dough thus produced contains a certain number of impurities, in particular knots, heaps of fibers and small, insufficiently defibrated pieces called buchettes. This is why the dough also passes through a disintegrator which performs final defibration and then through various sorting devices.
  • the raw pulp is made up of fibers normally too coarse to be usable directly for the manufacture of paper and must therefore undergo a so-called refining treatment in a refining pile or a refiner. During this treatment, and in particular under the action of water, a so-called fibrillation effect is obtained which promotes the adhesion of the fibers to each other during the manufacture of paper.
  • cellulose fiber pulps can have other uses.
  • the pulps of fibers produced by the papermaking route serve as raw material for the manufacture of absorbent products of the cellulose wadding type or of molded products in which the fibers isolated by the defibration treatment are mixed with a thermosetting binder.
  • sorting and refining are carried out in very dilute suspension, which has no disadvantage in the manufacture of paper which in any case requires feeding the machines with a very dilute suspension in order to obtain a good fiber distribution.
  • non-paper applications it is advantageous to reduce as much as possible the content of the pulp in liquid, the elimination of which requires a great expenditure of energy.
  • the subject of the invention is a new process allowing the final defibration of the pulp by means better suited to the production of fiber pulp for non-paper use and which, moreover, requires simpler equipment and much less bulky and a much lower energy expenditure.
  • the new method according to the invention makes it possible to adapt much more flexibly to productions of medium importance.
  • the defibration treatment being carried out in a screw machine of known type, after having obtained the desired degree of defibration by passage through the first treatment zones, the scabs and fiber bundles are completely eliminated by passage of the material in at least two additional treatment zones, until a homogeneous paste consisting only of isolated fibers which have not undergone fibrillation is obtained.
  • the wood chips can be fed to the upstream orifice of the machine with a very small amount of water and, in particular, when the chips are soaked with water before defibration, as is usually the case, the quantity of liquid phase which they contain is generally sufficient, the material being able to be entrained from one treatment zone to another and defibrated under good conditions up to a 55% dryness.
  • the dough thus produced contains a certain quantity of fiber bundles and insufficiently defibrated sticks, yet the defibration treatment cannot be continued by further reducing the width of the windows because, in some cases, the quality of the dough would be reduced by excessive shortening of the fibers. This is why, when the fiber pulp produced is intended for the manufacture of paper, it is subjected to a refining operation by conventional means.
  • this passage into additional treatment zones does not replace refining because the fibrillation effect sought for paper pulps is not obtained, but, precisely, in non-paper applications, fibrillation is not necessary and can sometimes be harmful.
  • this type of machine also has the very advantageous advantage of also carrying out, if necessary, the elimination of most of the resin contained in the wood.
  • This elimination of the resin is particularly useful for obtaining absorbent materials of the cellulose wadding type.
  • this type of product was made from a chemical paste for which the cooking before was carried out with reagents chosen so as to effect the elimination of the resin at the same time as that of the lignin.
  • the chemical route also gave the advantage of providing a very fine paste devoid of buchettes.
  • chemical pulp is expensive and attempts have also been made to make absorbent materials from thermo-mechanical or mechanical-chemical pulp. In this case, the resin must be removed by a reagent, generally before the defibration treatment.
  • such pulps contain a certain amount of flossers which are not suitable for the usual uses of cellulose wadding and which, as said above, must be eliminated by means known in the paper industry.
  • the passage in the compression zones that is to say at the end of the drive sections and in the braking sections makes it possible to express the resin which dissolves in the liquid phase expressed at the same time and can be discharged with it through the filtration orifices provided upstream of the compressed zones.
  • This mechanical effect is amplified if a reagent promoting the detachment of the resin is introduced into the sheath.
  • a bleaching reagent such as a mixture of hydrogen peroxide and sodium peroxide, without sequestering agent, activates the elimination of the resin.
  • the bleaching reagent is, in this case, introduced from the first treatment zone at the start of defibering, which allows it to impregnate the chips in the first drive zone with the first pressure build-up.
  • the bleaching reagent is also introduced into the second treatment zone where the elimination of the resin is continued and the pulp is at the same time bleached.
  • the first two treatment zones with filtration orifices.
  • the pulp is concentrated in the first zone by eliminating part of the liquid phase with the resin and, in the second zone, a washing liquid can be injected which activates the elimination of impurities.
  • a certain quantity of bleaching reagent is allowed to pass downstream, which makes it possible to complete it in the following treatment zones so as to obtain, at the outlet of the machine, a defibrated, refined and bleached pulp, which is particularly interesting when making cellulose wadding.
  • the fiber pulp is mixed with a binder for the production of molded objects
  • the risk of clogging of the filtering walls is reduced and the speed of dehydration is increased.
  • the elimination of the resin and of the water promotes the mixing of the fibers with the binder.
  • FIG. 1 is a view in longitudinal section through the axis of a screw
  • FIG. 2 being a view in cross section along II, II of FIG. 1.
  • the machine comprises two screws 1 and 2 with parallel axes and provided with identical threads which penetrate one into the other.
  • a sheath 3 which envelops the two screws is provided at one end with a supply orifice 31 and at the other end with a discharge orifice 32. The two screws are rotated in the direction allowing, depending on the not threads, to entrain the material introduced through the orifice 31 to the outlet orifice 32.
  • the threads of the screws have various pitches which determine successive treatment zones, respectively I, II, III ... etc.
  • the machine comprises six treatment zones followed by a zone VII for discharging the treated material towards the outlet orifice 32.
  • Each treatment zone comprises a zone A whose pitch determines, as a function of the direction of rotation of the screw, the drive downstream of the material and a zone B whose pitch is reversed so as to determine a braking of the material and therefore compression at the end of zone A and in zone B.
  • the threads 11 and 21 of the screws in zone B are provided with openings 12, 22 forming windows which extend from the shaft of the screw to the periphery of the thread.
  • the width of the windows decreases when going downstream.
  • the windows can have a width comprised between 15 and 20 mm in the first braking section and from 4 to 5 mm at the exit of the last defibration zone, i.e. zone III or IV. This width is kept in the braking sections of the following zones V and VI.
  • orifices 33 generally placed just in front of the braking sections B1, B2, etc., that is to say in the compressed areas, make it possible to inject various reactants under pressure and, in the first two treatment zones 1 and II, filter parts 34 are provided in the sheath upstream of the compressed zones.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Claims (11)

1. Verfahren zur Herstellung einer Masse aus Zellstoff-Fasern, die nicht für die Papiererzeugung bestimmt ist, durch Durchgang von Holzschnitzeln bzw. -spänen durch eine Holzschleif- bzw. -zerfaserungsmaschine mit wenigstens zwei Schraubenspindeln bzw. Schnecken (1, 2) mit identischen Gewinden, die ineinander eingreifen und drehbar innerhalb einer Hülse (3) angetrieben werden, die mit einer stromaufwärts gelegenen Einlaßöffnung (31) für die Schnitzel und mit einer stromabwärts gelegenen Auslaßöffnung (32) für das zerfaserte Material versehen ist, wobei die Gewinde (11, 21) der Schnecken (1, 2) verschiedene Ganghöhen bzw. Steigungen aufweisen, wodurch eine Aufeinanderfolge von Behandlungszonen (I, II ...) gebildet wird, von welchen jede einen Abschnitt (A) von direkter Steigung, d. h. direkter Antriebsrichtung des Materials stromabwärts und einen Abschnitt (B) von umgekehrter Steigung mit Druckanstieg durch Bremsen des Materials aufweist, wobei die Gewinde mit umgekehrter Steigung mit Fenstern (12, 22) für den Durchtritt des Materials, das den gewünschten Zerfaserungsgrad erreicht hat, nach stromabwärts versehen sind, wobei die Hülse (3) mit Filterabschnitten (34) versehen ist, die stromaufwärts von den Bremsabschnitten (B) mit umgekehrter Steigung in wenigstens den ersten beiden Behandlungszonen (I, II) vorgesehen sind, um ein Trocknen des Materials zu bewirken, dadurch gekennzeichnet, daß zuerst das Material durch Durchgang bzw. Befördern in den ersten Behandlungszonen (I, 11,111), die Abschnitte (B) von umgekehrter Steigung aufweisen, welche mit Fenstern versehen sind, deren Abmessungen von einer Zone zur folgenden bis auf eine Breite von 4-5 mm abnehmen, das Material auf den gewünschten Zerfaserungsgrad gebracht wird, daß gleichzeitig eine Trocknung durch Filtern bis zu einem Trocknungsgrad von 35-55% vorgenommen wird und daß darauf in der gleichen Maschine die Holzreste und Faserballungen ausgeschieden werden, ohne die Länge der Fasern zu verringern und ohne eine Fibrillierung vorzunehmen, indem das zerfaserte und getrocknete Material durch wenigstens zwei zusätzliche Behandlungszonen (IV, V) geführt wird, die Bremszonen von umgekehrter Steigung aufweisen, die mit Fenstern von der gleichen Breite von 4-5 mm versehen sind wie die Fenster in der letzten Zerfaserungszone (111) und daß am Ausgang der Maschine eine homogene Masse erhalten wird, die ausschließlich aus einzelnen Fasern besteht, die keiner Fibrillierung unterworfen wurden.
2. Verfahren zur Herstellung einer Fasermasse nach Anspruch 1, dadurch gekennzeichnet, daß die Maschine mit Schnitzeln von harzreichen Hölzern gespeist wird, deren Alter in bezug auf das Datum des Schnittes so gewählt wird, daß sich das Harz aus den es enthaltenen Kanälen löst und das der Großteil des Harzes auf mechanischem Wege gleichzeitig mit dem Zerfasern bzw. Schleifen in den beiden ersten Behandlungszonen (I, 11) ausgeschieden wird.
3. Verfahren zur Herstellung einer Fasermasse nach Anspruch 2, dadurch gekennzeichnet, daß ein Bleichmittel wenigstens in den ersten Antriebsabschnitt (A1) eingespritzt wird, um das Lösen des Harzes zu fördern und gleichzeitig das Bleichen der Masse während des Zerfaserns bzw. Schleifens zu bewirken.
4. Verfahren zur Herstellung einer Fasermasse nach einem der Ansprüche 2 und 3, dadurch gekennzeichnet, daß eine Waschflüssigkeit in die Hülse (3) stromabwärts von der ersten Behandlungszone (I) eingespritzt wird, um das Waschen wenigstens in der zweiten Antriebszone (A2) zu bewirken, und daß die verbrauchte Flüssigkeit durch die in der Hülse (3) ausgebildeten Filteröffnungen (34) ausgetragen wird.
5. Verfahren zur Herstellung einer Fasermasse nach Anspruch 1, dadurch gekennzeichnet, daß in die Hülse (3) ein flüchtiges Lösungsmittel stromabwärts vom ersten Bremsabschnitt (B1) mit umgekehrter Steigung eingespritzt wird.
6. Herstellungsverfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Material durch wenigstens fünf Behandlungszonen geführt wird.
7. Herstellungsverfahren nach Anspruch 3, dadurch gekennzeichnet, daß das eingespritzte Bleichmittel eine Mischung aus Wasserstoffperoxid und einem alkalischen Produkt ist.
8. Herstellungsverfahren nach Anspruch 1, dadurch gekennzeichnet, daß vor dem Beschicken der Holzschleifmaschine die Schnitzel einer Sulfonierungsvorbehandlung unterworfen werden.
9. Herstellungsverfahren nach Anspruch 1, da- durch gekennzeichnet, daß die Holzschnitzel nach dem Schneiden weniger als drei Tage alt sind, um zu gewährleisten, daß das in ihnen enthaltene Harz flüssig bleibt.
10. Herstellungsverfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Holzschnitzel nach dem Schneiden wenigstens sechs Monate alt sind, so daß das in ihnen enthaltene Harz verhärtet ist.
11. Maschine für die Herstellung einer Masse aus Zellstoff-Fasern, die nicht für die Papierherstellung bestimmt ist, mit wenigstens zwei Schraubenspindeln bzw. Schnecken (1, 2) mit identischen Gewinden, die ineinander eingreifen und drehbar innerhalb einer Hülse (3) angetrieben sind, die mit einer stromaufwärts gelegenen Einlaßöffnung (31) für die Schnitzel und mit einer stromabwärts gelegenen Auslaßöffnung (32) für die zerfaserte Masse versehen ist, wobei die Gewinde (11, 21) der Schraubenspindeln bzw. Schnecke (1, 2) verschiedene Steigungen aufweisen, um so eine Aufeinanderfolge von Behandlungszonen (I, 11 ...) zu bilden, von welchen jede einen Abschnitt (A) von direkter Steigung für den Antrieb des Materials stromabwärts und einen Abschnitt (B) von umgekehrter Steigung für den Druckanstieg durch Bremsen des Materials besitzt, wobei die Gewinde von umgekehrter Steigung mit Fenstern (12, 22) für das Durchtreten des Materials, das den gewünschten Zerfaserungs- bzw. Schleifgrad erreicht hat, nach stromabwärts versehen sind und die Hülse (3) mit Filterabschnitten (34) versehen ist, die stromaufwärts von den Bremsabschnitten (B) von umgekehrter Steigung wenigstens in den beiden ersten Behandlungszonen (I, II) vorgesehen sind, um ein Trocknen bzw. Entwässern des Materials zu bewirken, dadurch gekennzeichnet, daß sie stromabwärts von einem ersten Abschnitt des Zerfaserns und Entwässerns der Schnitzel einen zweiten Abschnitt für die Ausscheidung der Holzreste und Faserballungen ohne Fibrillierungswirkung besitzt, daß der erste Abschnitt wenigstens drei Zerfaserungs- bzw. Schleifzonen umfaßt, in welchen die Abschnitte (B1, B2, B3) von umgekehrter Steigung mit Fenstern (12, 22) versehen sind, deren Abmessungen von einem Abschnitt zum folgenden bis auf 4-5 mm im letzten Abschnitt (B3) abnehmen, und daß der zweite Abschnitt wenigstens zwei zusätzliche Behandlungszonen (IV, V) besitzt, die mit Abschnitten von umgekehrter Steigung (B4, B5) versehen sind, welche Fenster (12, 22) von den gleichen Abmessungen von 4-5 mm aufweisen wie die letzte Zerfaserungs- bzw. Schleifzone (111).
EP82401346A 1981-07-20 1982-07-20 Verfahren zur Herstellung eines Cellulosefaserstoffbreis für nicht papierähnliche Anwendungen Expired EP0070782B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82401346T ATE15918T1 (de) 1981-07-20 1982-07-20 Verfahren zur herstellung eines cellulosefaserstoffbreis fuer nicht papieraehnliche anwendungen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8114054 1981-07-20
FR8114054A FR2509766A1 (fr) 1981-07-20 1981-07-20 Procede de fabrication d'une pate de fivres cellulosique pour utilisation non papetiere

Publications (2)

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EP0070782A1 EP0070782A1 (de) 1983-01-26
EP0070782B1 true EP0070782B1 (de) 1985-10-02

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EP82401346A Expired EP0070782B1 (de) 1981-07-20 1982-07-20 Verfahren zur Herstellung eines Cellulosefaserstoffbreis für nicht papierähnliche Anwendungen

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EP (1) EP0070782B1 (de)
AT (1) ATE15918T1 (de)
CA (1) CA1193405A (de)
DE (1) DE3266691D1 (de)
FR (1) FR2509766A1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2625645B1 (fr) * 1988-01-13 1991-07-05 Wogegal Sa Procede et installation de realisation d'un produit servant de support de culture
EP0979895A1 (de) * 1998-08-12 2000-02-16 Instituut Voor Agrotechnologisch Onderzoek (Ato-Dlo) Verfahren und Vorrichtung zum Raffinieren von Fasern
GB2441748A (en) * 2006-09-13 2008-03-19 Freeland Horticulture Ltd Apparatus and process for the treatment of plant waste to produce growing media
FR2980332B1 (fr) * 2011-09-26 2013-10-11 Florentaise Procede de preparation de fibres de bois pour un substrat de culture
FR2980333B1 (fr) * 2011-09-26 2014-08-29 Florentaise Installation pour preparer des fibres de bois pour un substrat de culture
CN107541977A (zh) * 2017-09-30 2018-01-05 河北天正筛选制浆设备有限公司 一种多螺杆高浓度置换洗涤磨浆疏解装置和浆料洗涤系统

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2436844A2 (fr) * 1978-09-19 1980-04-18 Creusot Loire Procede et machine de fabrication de pate a papier
FR2451963A1 (fr) * 1979-03-22 1980-10-17 Creusot Loire Procede et installation de preparation et de lavage d'une pate a papier a partir d'une matiere lignocellulosique reduite en morceaux

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Publication number Publication date
FR2509766A1 (fr) 1983-01-21
CA1193405A (fr) 1985-09-17
ATE15918T1 (de) 1985-10-15
DE3266691D1 (en) 1985-11-07
EP0070782A1 (de) 1983-01-26
FR2509766B1 (de) 1983-11-10

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