EP0336842B1 - Verfahren zur Herstellung eines Papierstoffes für treuhänderische Verwendung - Google Patents

Verfahren zur Herstellung eines Papierstoffes für treuhänderische Verwendung Download PDF

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Publication number
EP0336842B1
EP0336842B1 EP89400938A EP89400938A EP0336842B1 EP 0336842 B1 EP0336842 B1 EP 0336842B1 EP 89400938 A EP89400938 A EP 89400938A EP 89400938 A EP89400938 A EP 89400938A EP 0336842 B1 EP0336842 B1 EP 0336842B1
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EP
European Patent Office
Prior art keywords
pulp
phase
bleached
washing
zone
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.)
Expired - Lifetime
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EP89400938A
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English (en)
French (fr)
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EP0336842A1 (de
Inventor
Philippe Combette
Robert Angelier
Christian Vieu
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CENTRE TECHNIQUE DE L'INDUSTRIE DES PAPIERS CARTONS ET CELLULOSE
Clextral SAS
Banque de France
Original Assignee
CENTRE TECHNIQUE DE L'INDUSTRIE DES PAPIERS CARTONS ET CELLULOSE
Clextral SAS
Banque de France
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Publication of EP0336842A1 publication Critical patent/EP0336842A1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
    • B30B9/121—Screw constructions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
    • B30B9/16—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing operating with two or more screws or worms
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse

Definitions

  • the present invention relates to a process for the manufacture of paper pulp for fiduciary use.
  • the invention applies more particularly to the manufacture of a paper pulp obtained from textile fibers such as, for example, cotton, ramie, or linen, intended for the production of very high quality paper such as that used for the production of banknotes.
  • this type of paper must in particular have determined mechanical characteristics, that is to say a high breaking load and resistance to folding, as well as a uniformity and a texture suitable for the formation of a watermark.
  • this paper must meet very strict criteria, particularly in terms of its dimensional stability, its optical whiteness and its cleanliness.
  • the raw material generally consisting of cotton fibers coming either from waste from combing machines, or also in the form of textile waste, or from other textile fibers such as ramie, linen, is first subjected to coarse shredding and, is stored in a silo. The fibers and / or fiber bundles are then compacted using a pestle in a rotating tank, therefore at the outlet of this device the raw material is in the form of annular rings.
  • the annular crowns also called “cakes" are then admitted into a digester where the operations of joint are carried out leaching and bleaching using an aqueous solution of sodium hydroxide and hydrogen peroxide. This operation is carried out under a pressure close to atmospheric pressure and at a temperature of the order of 90 ° to 95 ° C.
  • the blanched cakes are always placed in the digester, washing is carried out with clear water in order to remove the leaching and bleaching reagents.
  • the purpose of the compacting operation using the pestle, before introduction into the digester, is essentially to increase the density of the raw material in order to best use the volume of said digester.
  • the cakes, bleached and washed after extraction from the digester, are shredded using a special machine of the milling type.
  • the material is then treated in stacking stacks or using another system adapted to this fibrous material.
  • This operation carried out in water allows in addition to the separation of the textile fibers, to cut them uniformly to a length of 3 to 4 mm.
  • the fibers thus obtained are introduced into a vat and constitute the raw dough or half-dough.
  • the raw pulp is then passed through a disc refiner, where the fibers are refined. This operation modifies the physical structure of the fibers and gives the paper the physical and mechanical characteristics required by fiduciary use.
  • the refined pulp then arrives in a mixing vat in which is added pulp from the recycling of winder trimmings or trimmers and defective paper waste. This the mixing vat then feeds a vat located at the head of the paper machine proper.
  • the traditional manufacture of fiduciary paper corresponds to a discontinuous process, and includes numerous handling operations for loading and unloading of the apparatuses, more particularly for the pounding of cakes, the washing and milling of bleached cakes.
  • the present invention relates to a process avoiding the aforementioned drawbacks and making it possible to continuously prepare the paper pulp with the required qualities, without breaking the load in the line for preparing said pulp, from the distribution silo after shredding in the manner first until the semi-dough or raw dough is obtained before refining.
  • the method according to the invention makes it possible to considerably reduce the energy consumption usually required to produce such a paste.
  • the raw material consists of cotton fibers originating either from waste from the combing machine, or even in the form of rags, but other textile fibers such as, for example, ramie and linen can be used.
  • the raw material in the form of bales 1 of textile fibers is first coarsely shredded in a bale opener 2 and introduced into a distribution silo 3.
  • the fibers are then compacted to using a pestle in a rotating tank 4 and therefore leaving this device the raw material is in the form of annular rings.
  • the annular rings are then admitted into a digester 5 where the leaching and bleaching operations are carried out jointly using an aqueous solution of sodium hydroxide and hydrogen peroxide.
  • the bleached crowns are still placed in the digester 5, washing is carried out with clear water in order to remove the leaching and bleaching reagents.
  • Bleached crowns washed after extraction from the digester 5 are shredded using an apparatus of the milling type 6.
  • the material is then treated in a runner 7. This operation, carried out in water, makes it possible, in addition to the separation of the textile fibers, to cut them uniformly.
  • the fibers thus obtained, always accompanied by water, are introduced into a vat 8 and constitute the raw dough or half-dough.
  • the raw pulp then passes through a refiner 9, and the pulp thus refined is then admitted into a mixing vat 9a into which is added pulp originating from the recycling of the trimmers of winders or guillotines and waste paper defective.
  • This mixing vat then feeds a vat, not shown, located at the head of the actual paper machine.
  • the textile fibers accompanied by water are then introduced into a first treatment machine 10 of the type to two co-rotating screws.
  • the first treatment machine 10 comprises at least two screws 11 and 12 driven in rotation around their axes by a motor 13 and a reduction gear 14 (FIG. 3) inside an elongated enclosure forming a sheath 15 which envelops them.
  • the screws 11 and 12 are provided with helical threads which mesh with one another and the internal wall of the sheath forms two intersecting cylindrical lobes, with an inside diameter slightly greater than the outside diameter of the threads. These threads are nested one inside the other, and the two screws are driven at the same speed of rotation and in the same direction so that the two screws are identical, the threads being simply offset with respect to each other.
  • the screws 11 and 12 are advantageously made up of splined shafts 16 and 17 respectively on which are stacked sections of screws made up of sleeves.
  • the internal bore of these sleeves is provided with grooves corresponding to those of the shaft and the external part is provided with helical threads whose pitch differs depending on the section considered for the treatment and transport of the material. It is thus possible to have a fairly large number of sections making it possible to vary the pitch, the depth, the number of nets and the length of each zone.
  • the sheath is pierced with a feeding orifice 18 surmounted by a hopper 19, d brought products.
  • the screws 11 and 12 are provided with threads 20 with a wide pitch and a reduced section, in order to ensure the transfer of the products introduced through this orifice 18 which opens widely on the two screws 11 and 12 in order to distribute the material in the threads 20.
  • the textile fibers and water, or possibly the effluents from the second treatment machine 40, are therefore immediately transported downstream of the treatment machine and mixed by the effect of rotation and meshing of the screws 11 and 12.
  • zone B the screws have threads 21 with a tight pitch and a thicker section, so that when the products are mixed, they will be compressed.
  • the material then passes through a shear zone C.
  • the zone C is provided with helical threads 22 whose winding direction is reversed with respect to that ensuring the transfer of the material in the processing machine 10.
  • these threads 22 are formed openings 23 which extend radially from the core of each screw 11 and 12 to the periphery of the threads and which are also regularly distributed around the axis.
  • the screws 11 and 12 are fixed so that two openings 23 periodically coincide in the central meshing zone. This controls the passage of the material flow downstream, which determines braking in this zone C, and a compression effect upstream.
  • Zone D conveying and processing zone, is provided with threads 24 whose pitch and thickness have characteristics close to those of zone B.
  • the sheath is provided with a opening 25, connected to a pipe 26 arrival of the leaching and bleaching reagents consisting, in particular, of an aqueous sodium hydroxide solution, water, and hydrogen peroxide optionally accompanied by sequestering and stabilizing agents.
  • These reagents come from a dosing and injection station which includes a tank 27 for storing the aqueous sodium hydroxide solution, pipes 28 for supplying water and a tank 29 for storing hydrogen peroxide (FIG. 2) . Therefore, all along this zone D, the textile material will be stirred and mixed with these reagents in order to ensure this essential leaching and bleaching step in the manufacture of paper pulp.
  • the treatment machine of the type with two co-rotating screws is particularly well suited for carrying out this operation. Indeed, due to the rotation of the screws in the same direction, there is a reversal of the material in the interpenetration zone of the threads which is particularly effective as regards its kneading, which allows an intimate mixing of the reagents and textile fibers that have been in the upstream areas impregnated with water. In this way, a better use of the reagents is obtained, which results on the one hand in an economy of these and on the other hand by a reduction, in the subsequent phases, of the clear washing water and therefore effluents from the installation.
  • this mixing work is accompanied by an internal heating of the material, and without external heat input, the temperature thereof will be maintained at a value of 90 ° or 95 ° C compatible with good kinetics reactions, without thermal alteration of the paper pulp.
  • zone D of conveying and processing is followed by a zone E which is a braking zone constituted, like the zone C of helical threads 30 of winding opposite to that in advance of the material, or counter-threads, and also comprising passage windows 31.
  • a zone E which is a braking zone constituted, like the zone C of helical threads 30 of winding opposite to that in advance of the material, or counter-threads, and also comprising passage windows 31.
  • Physical and thermal phenomena, as well as the functions carried out in this zone E are similar to what is carried out there in zone C, that is to say significant shearing and mixing , as well as scrolling and cutting the fibers.
  • the last section of the treatment machine 10 constituted by zone F comprises threads 32 whose pitch and thickness are similar to those of zone D.
  • the leaching and bleaching reactions continue during the flow of the material, in this zone which, moreover, ensures the transfer to the outlet orifice 33 constituted by a simple opening at the downstream end of the sleeve 15.
  • this first treatment machine 10 At the outlet of this first treatment machine 10, there is thus a flow at atmospheric pressure at a temperature of the order of 80 ° C. to 100 ° C. of a bleached paste, but which still contains the residual reagents and the products resulting from the action of these reagents on the raw material.
  • This paste is admitted by a simple flow chute, not shown, in a retention capacity 34 ( Figures 2 and 3).
  • This capacity 34 which has the essential role of completing the bleaching reaction comprises a screw conveyor system 34a, in order to transport the dough to the second processing machine 40.
  • This retention capacity 34 is dimensioned to obtain a relatively long residence time. weak between 10 min and 30 min.
  • the second treatment machine 40 (FIGS. 6, 7) is in its general design similar to the first treatment machine 10. It comprises at least two screws 41 and 42 driven in rotation around their axes by a motor 43 and a reduction gear 44 ( Figure 3) inside an elongated enclosure forming a sheath 45 which envelops them.
  • the screws 41 and 42 are provided with helical threads which mesh with one another and the inner wall of the sheath forms two intersecting cylindrical lobes, with an inside diameter slightly greater than the outside diameter of the threads.
  • the threads are nested inside each other, and the two screws are driven at the same speed of rotation and in the same direction so that the two screws are identical, the threads being simply offset from each other.
  • the sheath is pierced with an introduction orifice 46 surmounted by a hopper 46a for supplying the products.
  • the screws 41 and 42 are provided with threads 47 to not wide and of reduced section to ensure the transfer of the products introduced by this orifice 45 which opens widely on the two screws 41 and 42 in order to distribute the material in the threads.
  • the bleached pulp and this first fraction of the washing water are therefore immediately transported downstream of the treatment machine 40, and mixed by the effect of rotation and meshing of the screws 41 and 42.
  • the dough passes through a succession of zones H1, H2 ... similar in their construction and in their function.
  • the processing machine 40 has four H-type zones, which constitutes an interesting compromise as regards the production of the processing machine and the characteristics of the dough obtained. It is obvious that the process which is the subject of the present invention also applies to constructive solutions comprising a greater number of these sections H by modifying the geometrical characteristics of the threads.
  • Each zone H for example zone H1, comprises a first element of compression and washing zone H11, and a second element of braking and shearing zone H12.
  • the screws have threads 48 with a tight pitch and a cross section thicker than that of the thread 47 of zone G. In this way, to the mixture of products will be added compression of the fibrous material . Therefore, all along the element H11, the bleached pulp is stirred and mixed with the washing water introduced into the feed hopper 46a in order to remove the residual reagents and the products resulting from the action of the reagents on the paste. Downstream of the H11 zone, where the compression is maximum, the washing effluents are discharged by means of filters 53 judiciously placed in the sheath 45.
  • the zone element H12 is provided with threads 49 whose winding direction is reversed with respect to that ensuring the transfer of the material in the processing machine 40.
  • these threads 49 are provided openings 50 which extend radially from the core of each screw 41 and 42 to the periphery of the threads and are also regularly distributed around the axis.
  • the screws 41 and 42 are set so that two openings 50 periodically coincide in the central meshing zone. This controls the passage of the pulp flow downstream, which determines braking in this zone H12 and a compression effect upstream. Furthermore, it follows a significant shearing of the dough, which in addition to the homogenization thereof constitutes a phase of unthreading and cutting the fibers.
  • the sleeve 45 is connected to a pipe 52 for supplying clean washing water. Therefore, all along element H21, the bleached pulp is stirred and mixed with the washing water in order to remove the reagents residuals and products from the action of the reactants on the pulp.
  • the treatment machine of the type with two co-rotating screws is particularly suitable for carrying out this washing operation efficiently and economically as regards the volume of water used. Indeed due to the rotation of the screws 41 and 42 in the same direction, there is a reversal of the dough in the interpenetration zone of the threads which is particularly effective for achieving an intimate mixture of the dough and the water of washing, which thus translates into a saving thereof.
  • the dough thus passes successively into zones H1, H2, H3 and H4 where the washing and unrolling operations for the dough take place in an identical manner.
  • the outflows from the washing effluents are produced by means of filters 53 in the downstream parts of the elements of zones H11, H21, H31 and H41.
  • Zone J which constitutes the downstream outlet section of the dough, is similar to the elements H11, H21, H31 and H41 and comprises threads 51 similar to the threads 48. It essentially ensures the transfer function of the bleached and washed dough, which leaves the processing machine 40 through an orifice 54 and is then admitted directly into the half-pulp vat 8, upstream from the refiner 9 (FIG. 2) and from the paper machine.
  • the method according to the present invention can also be implemented by a single processing machine of the type with two co-rotating screws ensuring in an upstream part all the functions of the first treatment machine and in a downstream part all of the functions of the second processing machine.
  • the paper pulp obtained with the method according to the present invention makes it possible to produce a paper entirely in accordance with what is required in traditional manufacture of fiduciary paper.
  • the measurements carried out on the residual soda content give an efficiency of 85 to 90% for washing.
  • the process according to the present invention makes it possible to obtain a paper pulp for fiduciary use with the same characteristics as the traditional process, with a continuous production line, and lower energy and water consumption.
  • the savings in washing water thus produced mean that the volume of effluents generated in the manufacture of this paper is lower and that consequently the treatment of these effluents is less costly and the nuisances are lower.
  • the method according to the present invention eliminates handling operations for loading and unloading of the devices, as well as the pestle, the digester, the milling machine and the stackers which are necessary in the traditional process.

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

Claims (6)

  1. Verfahren zur Herstellung einer Papierpaste zur Verwendung für Papiergeld, insbesondere Banknoten, aus einem aus Textilfasern, wie zum Beispiel Baumwolle, Ramie oder Leinen bestehenden Rohstoff, das nacheinander folgende Arbeitsgänge aufweist:
    - mehrere Arbeitsgänge des Zerkleinerns des Rohstoffes,
    - mehrere Arbeitsgänge des Auslaugens, Bleichens und Waschens der Textilfasern,
    - einen Arbeitsgang des Zerkleinerns der ausgelaugten und gebleichten Textilfasern,
    - mehrere Arbeitsgänge der Zerkleinerung und des Waschens zum Auseinandertrennen, Schneiden und Waschen der ausgelaugten und gebleichten Textilfasern,
    - einen Arbeitsgang des Knetens in einem Kübel, um eine Roh- oder Halbpaste zu erhalten,
    - eine Refinermahlung, um eine Feinpaste zu erhalten,
    - einen Mischvorgang in einem Kübel,
    dadurch gekennzeichnet, daß
    - die Arbeitsgänge des Auslaugens, Bleichens und Waschens der Textilfasern sowie der Arbeitsgang des Zerkleinerns der zuvor ausgelaugten und gebleichten Textilfasern kontinuierlich in einer ersten Behandlungsmachine (10) mit zwei sich gemeinsam drehenden Schnecken (11, 12) durchegeführt werden, um eine gebleichte Paste zu erhalten,
    der Arbeitsgang des Bleichens in einem mit Mitteln (43a) zum Transport der Paste ausgestattenen Retentionsraum (34) fortgesetzt wird, wobei die Verweildauer der Paste im Retentionsraum (34) zwischen 10 und 30 Minuten beträgt,
    - und die Arbeitsgänge der Zerkleinerung und des Waschens kontinuierlich in einer zweiten Behandlungsmachine (40) mit zwei sich gemeinsam drehenden Schnecken (41, 42) durchgeführt werden, um eine gebleichte und gewaschene Paste zu erhalten.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die erste Behandlungsmachine (10) kontinuierlich von oben nach unten in Transportrichtung aufweist:
    - eine Phase A der Zuführung und des Mischens des Rohstoffs und des Wassers,
    - eine Phase B der Kompression,
    - eine Phase C des Abscherens,
    - eine Phase D des Transports und der Behandlung, wobei zu Beginn dieser Phase Laugungs- und Bleichmittel zugeführt werden, die insbesondere aus einer wäßrigen Lösung aus Natriumkarbonat und Wasserstoffperoxid bestehen,
    - einer weiteren Phase E des Abscherens,
    - und einer letzten Phase F des Transports und der Ableitung der gebleichten Paste in den Retentionsraum (34).
  3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die gebleichte Paste bei Austritt aus der Phase F des Transports und der Ableitung eine Temperatur von ungefähr 80 °C aufweist.
  4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die zweite Behandlungsmaschine (40) kontinuierlich von oben nach unten in Transportrichtung aufweist:
    - eine Phase G der Zuführung und des Mischens der aus dem Retentionsraum (34) kommenden gebleichten Paste und des Waschwassers,
    - mehrere aufeinanderfolgende Phasen (H1, H2...) der Kompression, des Abscherens und des Waschens der Paste,
    - und eine letzte Phase J des Transports und der Ableitung der gebleichten und gewaschenen Paste.
  5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß jede Phase (H1, H2...) aus einer ersten Phase (H11, H21...) des Knetens, wobei zu Beginn dieser ersten Phase Waschwasser eingeführt wird (46, 52) und am Ende dieser ersten Phase Abwässer abgeleitet werden (53), und einer zweiten Phase (H12, H22 ...) des Abscherens besteht.
  6. Verfahren nach Anspruch 4, dadurch gekennzeichent, daß die gebleichte Paste während der Phase G der Zuführung und des Mischens der gebleichten Paste und des Waschwassers eine Temperatur von ungefähr 65° bis 70 °C aufweist.
EP89400938A 1988-04-06 1989-04-05 Verfahren zur Herstellung eines Papierstoffes für treuhänderische Verwendung Expired - Lifetime EP0336842B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8804548A FR2629844B1 (fr) 1988-04-06 1988-04-06 Procede pour la fabrication d'une pate a papier a usage fiduciaire
FR8804548 1988-04-06

Publications (2)

Publication Number Publication Date
EP0336842A1 EP0336842A1 (de) 1989-10-11
EP0336842B1 true EP0336842B1 (de) 1992-12-02

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Application Number Title Priority Date Filing Date
EP89400938A Expired - Lifetime EP0336842B1 (de) 1988-04-06 1989-04-05 Verfahren zur Herstellung eines Papierstoffes für treuhänderische Verwendung

Country Status (8)

Country Link
US (1) US4983256A (de)
EP (1) EP0336842B1 (de)
CA (1) CA1331075C (de)
DE (1) DE68903662T2 (de)
DK (1) DK171829B1 (de)
ES (1) ES2036354T3 (de)
FI (1) FI88186C (de)
FR (1) FR2629844B1 (de)

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FI88186C (fi) 1993-04-13
FR2629844B1 (fr) 1991-09-27
DK171829B1 (da) 1997-06-23
DK163389A (da) 1989-10-07
FI88186B (fi) 1992-12-31
CA1331075C (fr) 1994-08-02
DK163389D0 (da) 1989-04-05
US4983256A (en) 1991-01-08
EP0336842A1 (de) 1989-10-11
DE68903662D1 (de) 1993-01-14
DE68903662T2 (de) 1993-05-06
FR2629844A1 (fr) 1989-10-13
FI891626A0 (fi) 1989-04-05
ES2036354T3 (es) 1993-05-16
FI891626A (fi) 1989-10-07

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