EP0070782A1 - 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
EP0070782A1
EP0070782A1 EP82401346A EP82401346A EP0070782A1 EP 0070782 A1 EP0070782 A1 EP 0070782A1 EP 82401346 A EP82401346 A EP 82401346A EP 82401346 A EP82401346 A EP 82401346A EP 0070782 A1 EP0070782 A1 EP 0070782A1
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EP
European Patent Office
Prior art keywords
manufacturing
treatment
downstream
pitch
machine
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
EP82401346A
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English (en)
French (fr)
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EP0070782B1 (de
Inventor
Pierre Berger
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.)
Clextral SAS
Original Assignee
Clextral SAS
Creusot Loire SA
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.)
Filing date
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 lignin 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 defibering wood chips.
  • This machine described, in particular in French Patent No. 2,319,737 comprises at least two identical threaded screws meshing one inside the other and driven in rotation inside a sheath provided with an upstream orifice 'entry of the chips and a downstream outlet outlet of the defibrated material; the threads of the screws have various pitches which determine a succession of treatment zones each comprising a direct-step section in which the material is driven downstream and an inverted step section which slows down the advancement of the material and consequently determines a rise 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 maintain the insufficiently defibrated material upstream and to allow the material having reached the desired degree of defibration to pass downstream, most of the defibration work being obtained by a combination of compression and shearing effects in the compressed areas, in particular thanks to the fact that, in these areas, 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. Generally, 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 washing and a spinning to a degree at least 35% dryness.
  • the sheath surrounding the screws is provided with filtering zones in the parts preceding the sections with inverted pitch. 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 sticks. This is why the dough also passes through a disintegrator which performs final defibration and then through various sorting devices.
  • the raw pulp consists of fibers normally too coarse to be used directly for the manufacture of paper must therefore undergo a so-called refining treatment in a refining pile or a refiner.
  • a so-called fibrillation effect is obtained which promotes the adhesion of the fibers to each other during the production of paper.
  • cellulose fiber pulps can have other uses.
  • the pulps of fibers produced by the papermaking process 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 the machines to be fed with a very dilute suspension in order to obtain 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 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 clumps 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 defibration treatment is carried out gradually by passing through several treatment zones each consisting of a direct-pitch drive section followed by a braking section provided with reverse-pitch threads in which windows are provided whose width makes it possible to control the downstream passage of the material having reached the desired degree of defibration. If you start with wood chips, you can reach the degree of defibration of a normal pulp by passing through three or four treatment zones.
  • 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, but the defibration treatment cannot be continued by further reducing the width of the windows because, in -this case,. we would decrease. the quality of the dough by an 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 desired fibrillation effect is not obtained for paper pulp but, precisely, in non-paper applications, fibrillation is not necessary and can even, sometimes, be harmful.
  • 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 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 defibration, which allows it to impregnate the chips in the first training zone with the first pressure increase.
  • the bleaching reagent is also introduced into the second treatment zone where the elimination of the resin is continued and where 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 transverse 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 reagents under pressure and, in the first two treatment zones I and II filter parts 34 are formed in the sheath-upstream of the compressed zones.
  • the invention is not limited only to this embodiment. tion described only by way of example, or only to the applications that have been cited. This is how the fiber pulps thus produced could also serve as a raw material for nonwoven products.

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

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

Family

ID=9260656

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401346A Expired EP0070782B1 (de) 1981-07-20 1982-07-20 Verfahren zur Herstellung eines Cellulosefaserstoffbreis für nicht papierähnliche Anwendungen

Country Status (5)

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

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2625645A1 (fr) * 1988-01-13 1989-07-13 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
FR2980333A1 (fr) * 2011-09-26 2013-03-29 Florentaise Installation pour preparer des fibres de bois pour un substrat de culture
FR2980332A1 (fr) * 2011-09-26 2013-03-29 Florentaise Procede de preparation de 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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2441748A (en) * 2006-09-13 2008-03-19 Freeland Horticulture Ltd Apparatus and process for the treatment of plant waste to produce growing media

Citations (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

Patent Citations (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

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2625645A1 (fr) * 1988-01-13 1989-07-13 Wogegal Sa Procede et installation de realisation d'un produit servant de support de culture
EP0324689A1 (de) * 1988-01-13 1989-07-19 Wogegal Sa Verfahren, Produkt und Vorrichtung zum Herstellen des als Kultursubstrat zu verwendenden Produktes
WO1989006488A1 (fr) * 1988-01-13 1989-07-27 Wogegal S.A. 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
WO2013045820A1 (fr) * 2011-09-26 2013-04-04 Florentaise Procede de preparation de fibres de bois pour un substrat de culture.
FR2980332A1 (fr) * 2011-09-26 2013-03-29 Florentaise Procede de preparation de fibres de bois pour un substrat de culture
FR2980333A1 (fr) * 2011-09-26 2013-03-29 Florentaise Installation pour preparer des fibres de bois pour un substrat de culture
WO2013057402A1 (fr) * 2011-09-26 2013-04-25 Florentaise Installation et procede pour preparer des fibres de bois pour un substrat de culture
US8777144B2 (en) 2011-09-26 2014-07-15 Florentaise Installation for preparing wood fibers for a cultivation substrate
US8783591B2 (en) 2011-09-26 2014-07-22 Florentaise Method of preparing wood fibers for a cultivation substrate
GB2511648A (en) * 2011-09-26 2014-09-10 Florentaise Facility and method for preparing wood fibres for a culture substrate
GB2511647A (en) * 2011-09-26 2014-09-10 Florentaise Method for producing wood fibres for a culture substrate
GB2511648B (en) * 2011-09-26 2018-07-18 Florentaise An installation for preparing wood fibres for a cultivation substrate
GB2511647B (en) * 2011-09-26 2018-07-18 Florentaise A method for preparing wood fibres for a culture substrate
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

Also Published As

Publication number Publication date
EP0070782B1 (de) 1985-10-02
FR2509766A1 (fr) 1983-01-21
CA1193405A (fr) 1985-09-17
ATE15918T1 (de) 1985-10-15
DE3266691D1 (en) 1985-11-07
FR2509766B1 (de) 1983-11-10

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