EP0280234B1 - Verfahren und Vorrichtung zur Verbesserung der Behandlung einer Fasersuspension und zur Kontrolle des Fliessens einer Fasersuspension - Google Patents

Verfahren und Vorrichtung zur Verbesserung der Behandlung einer Fasersuspension und zur Kontrolle des Fliessens einer Fasersuspension Download PDF

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Publication number
EP0280234B1
EP0280234B1 EP88102569A EP88102569A EP0280234B1 EP 0280234 B1 EP0280234 B1 EP 0280234B1 EP 88102569 A EP88102569 A EP 88102569A EP 88102569 A EP88102569 A EP 88102569A EP 0280234 B1 EP0280234 B1 EP 0280234B1
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EP
European Patent Office
Prior art keywords
fibre suspension
flow
valve
opening
pulp
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
Application number
EP88102569A
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English (en)
French (fr)
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EP0280234A3 (de
EP0280234A2 (de
Inventor
Toivo Niskanen
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.)
Ahlstrom Corp
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Ahlstrom Corp
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 Ahlstrom Corp filed Critical Ahlstrom Corp
Priority to EP93114759A priority Critical patent/EP0578284B1/de
Publication of EP0280234A2 publication Critical patent/EP0280234A2/de
Publication of EP0280234A3 publication Critical patent/EP0280234A3/de
Application granted granted Critical
Publication of EP0280234B1 publication Critical patent/EP0280234B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/53—Mixing liquids with solids using driven stirrers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/314—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit
    • B01F25/3141—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit with additional mixing means other than injector mixers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • B01F27/1126—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades the stirrer being a bent rod supported at one end only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/50—Pipe mixers, i.e. mixers wherein the materials to be mixed flow continuously through pipes, e.g. column mixers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • B01F27/1123—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades sickle-shaped, i.e. curved in at least one direction

Definitions

  • the present invention relates to a method and an apparatus for improving the treatment of fibre suspension and for the control of fibre suspension flow.
  • the method and apparatus according to the invention are particularly suitable to be used for mixing chemicals into high consistency pulp and controlling the pumping of high consistency pulp in the pulp and paper industry.
  • High consistency pulp is still generally pumped by a displacement pump and a screw pump. This was up till now the only way to pump high consistency pulp.
  • no control valve is used on the discharge side.
  • high consistency pulp is stiff and the pumps produce a pulsational pressure. If there is a throttling on the discharge side, it creates strong pressure pulses in the piping which can cause damage to the piping structures.
  • a displacement pump works even when there is no pulp in the suction side or so little pulp that it would only partly fill the compartments of the pump. The pump can work so that it pumps forward everything that comes from the suction side to the compartments.
  • High consistency pulp (consistency 8 - 20 %) is very stiff in its nature; it can be so stiff that one can stand with ordinary shoes on the pulp and not sink into the pulp. The reason for it is that fibres with size of a few millimetres form a strong three-dimensional fibre network. The fibres are rather rigid and when they rest on each other they form a strong structure. High consistency pulp can, however, be changed into a flowing state by breaking the fibre network by bringing shear forces to the suspension. This is called fluidization of high consistency pulp. Normally fluidization is effected by some kind of powerful rotor. For example, in a high consistency pump the rotor effects the fluidization in the suction duct of the pump. Fluidization is a reversible process, and as soon as the rotor stops or the pulp is no longer in the range of the rotor, the fibre network is formed again and the suspension becomes again solid material.
  • Fig. 6a shows in principle the reduction of the capacity of the present valves when the consistency grows.
  • Fig. 6b is a graph showing the capacity of a valve provided with a fluidizator. The reliability of the valve and the adjustability improve particularly with small opening angles.
  • a pump cannot be used as a mixer for several reasons. Such can be, for example, material problems or the fact that the amount or the quality of chemicals are such that the chemical cannot be added into the pump. Accordingly one has to use a separate mixer according to Fig. 2. There are cases in which part of the chemicals can be fed to the pump and the rest to the mixer or all chemicals to the mixer depending on the situation.
  • the mixer consists of a housing with an inlet opening and an outlet opening and protrusions on the inner surface, of a rotor which has protrusions on the outer surface, and of a feed duct for chemicals which opens to the mixing zone between the rotor and the housing.
  • the mixer although very practical and reliable, is, however, rather complicated to produce of special material.
  • a further object of the present invention is to eliminate the need of a separate mixer by means of a new kind of valve and to utilize the mixing properties of the valve as well as to lower the total resistance of the system and reduce the need of space.
  • the FI-application 850307 discloses a method and an apparatus for dividing and uniting the flows of high-consistency fibre suspensions, wherein the apparatus consists of a vortex chamber to which several inlet and/or outlet openings lead and in which there is a rotor creating a vortex flow.
  • the inventive idea of the present application includes also the fact that there are valves in the outlet ducts up to which the vortex flow should extend in order to make the apparatus work in the desired way.
  • the object of the present invention is to eliminate or minimize the defects of the arrangements according to the above-mentioned publications by the method and apparatus in accordance with the invention.
  • FIG. 1 In the systems according to the prior art (Fig. 1) the aim has been to place the valve in a small pipe close to the discharge side of the pump. A high flow velocity through the valve is thus achieved whereby the valve is prevented from clogging and the valve functions more reliably.
  • a valve according to the invention and the arrangement using it can be placed anywhere in the piping.
  • the construction of the valve is such that it works regardless of the rate of inlet flow.
  • the arrangement utilizing the invention enables mixing of chemicals without the pump being the only place where they can be added. In many cases in bleaching processes, part of the chemicals can be added in the pump and the rest in the control valve. No separate mixer is needed. Thus the arrangement according to the prior art (Fig. 2) is essentially simplified.
  • a significant advantage of the present invention resides in the great possibilities for adjustment of the volumetric flow. Because it is possible to fluidize the high consistency pulp just in front of the valve element, the valve opening can be throttled to its minimum and yet the pulp flow continues, in other words it is possible to reach low capacities even at high consistencies.
  • Fig. 1a illustrates the so-called level control principle, in which the output of the pump 2 is adjusted by the valve 1 so that the level of the pulp in the pulp container 3 remains constant.
  • Fig. 1b illustrates the so-called flow control principle, in which the pump 2 is attached to the pulp container 3.
  • the valve is disposed considerably far from the pump and in any case so far that high consistency pulp has time to form rigid fibre networks and the flow has time to change into plug flow.
  • the subsequent pressing of the pulp through the valve involves a significant loss of pressure.
  • a valve cannot be brought into the vicinity of the pump to avoid the pulp beginning to solidify, because the formation of the fibre network begins already in the pump itself just after the fluidization zone of the pump.
  • Fig. 2 shows an arrangement according to the prior art, for example, for mixing bleaching chemicals to the suspension.
  • the arrangement comprises a pulp tank 3, a pump 2, a level control valve 1 and a mixer 7 following the valve 1 in the direction of pulp flow, which mixer can be similar to, for example, the fluidizing mixer shown in the patent application FI 850854.
  • Drawbacks of the arrangement are a considerable overall loss of pressure in the apparatus especially with high consistency pulps and the costs of devices made of special materials.
  • a valve subsequent to the pump is necessary so as to enable the function of the pump to be controlled in the desired way by means of the valve .
  • devices inadequate in operation even at the MC-consistencies diminish considerably the advangtages obtainable by the MC-pumps.
  • Fig. 3 and 4 disclose an arrangements in accordance with the invention in which a valve 10 comprises in general a valve body 13 with inlet and outlet openings 14 and 15 attached to pipe connections 11 and 12 or the like.
  • the position of the calotte valve 19 is controlled by a spindle 20 protruding from the the valve body 13.
  • a coaxial shaft 21 protrudes from the valve body 13 in the opposite direction in relation to the spindle 20, and a fluidizing element 22 is attached to the end of shaft 21 inside the valve body 13 on the side of the concave surface of the calotte valve 19.
  • the above described main components are preferably situated in the following way in relation to the direction of the pulp flow: firstly the fluidizing element 22, then the calotte valve 19, and then the valve opening 16. It is, however, also possible to position the valve in the opposite disposition with the fluidizing element behind the valve element in the direction of flow so as to hinder the fibres from sticking around the valve opening.
  • the direction of the shaft of the rotor and the valve spindle may differ from each other or one of the shaft/spindle may be within the other.
  • the rotor can naturally also be arranged in connection with a shaft of another separate apparatus. For example, a screen, a thickener, a knotter or equivalent is appropriate.
  • Fig. 3 and 4 disclose a most preferred application for the valve arrangement according to the invention.
  • An inlet opening 23 for chemicals has been added to the valve body 13 in the direction of flow upstream of the other components and through which opening, for example, bleaching chemicals may be readily added into the pulp flow. Then by the same fluidization function, by which the pulp is brought into a liquid form and as such flows through the valve, a very efficient mixing of the chemicals into the pulp is effected.
  • the inlet opening for chemicals may also alternatively be located in the fluidization region.
  • a valve element according to the invention functions in the following way.
  • the pulp is subjected by the fluidizing element operating inside the valve body to such a considerable amount of shear forces that the bonds between the fibres forming a solid network of a pulp plug, loosen and the pulp flows like a liquid through the valve.
  • the loss of pressure caused by the valve is consequently only a fraction of what it would be without fluidization.
  • the most difficult situation is when the flow channel defined by the valve element 19 and the valve opening 16 is very small, in other words the volumetric flow is small.
  • the fibres stick very easily on the edges of the flow channel and gather together forming in a short time a plug which clogs the valve.
  • the fluidizing element it causes a pulse at the flow channel against the normal direction of flow, in other words it tends to draw off the fibre bundles formed on the edge of the opening and to return them to the rest of the pulp. If a rotating rotor is involved, the fibre bundles can be loosened also by the total effect of the structure of the valve element and the rotational direction of the rotor.
  • Fig. 5 discloses a further preferred arrangement, in which the valve 10 can be used also as a mixer, if so required.
  • a pump 2 is connected to a pulp tank 3 and the pump is followed by a valve apparatus 10 situated at an applicable position and, according to the embodiment shown in the figure is controlled by a level detector.
  • the arrangement in Fig. 5 can well be compared to the arrangement in Fig. 2, because in both cases the same measures are involved: control of the pump and mixing of chemicals.
  • the equipment in Fig. 5 is much simpler and an additional advantage is achieved by the higher outlet pressure compared to that of Fig. 2.
  • the valve according to the invention can be employed, for example, in an apparatus in which pulp is led from the MC-pump to the thickener which requires a certain counter pressure to function in the desired way. Consequently, the consistency of the pulp flow being throttled can easily be more than 15 %, even 20 %, whereby to ensure the flow (in other words hindrance of the clogging of the throttle point) fluidization of pulp is required immediately before the valve.
  • the valve is to be situated preferably exactly at the outlet opening of the thickener, because at the same time as the valve throttles the flow, it also enables the discharge of the pulp from the thickener.
  • the valve can also be used in connection with other components treating high consistency pulp.
  • Fig. 6a represents the behaviour of a conventional valve at high consistency pulps.
  • the test consistencies were 8, 10, 13 and 15 %.
  • the horizontal axis shows the opening angle of the valve and the vertical axis the mass flow passing through the valve.
  • Fig. 6b represents correspondingly the behaviour of the valve according to the invention at high consistencies. It is seen in the same coordinates that at small opening angles the 15 % pulp does not differ from water, so the adjustability is as good as that of water. At larger opening angles the 15 % pulp requires a little larger spread angle than water, but the curve does not bend horizontal as occurred with the valves according to the prior art.
  • Fig. 7 discloses comparative curves of the capacity (y-axis) of the valve in the function of the pressure difference prevailing across the valve.
  • the curves show the Q pulp /Q water relation of the volumetric flows, which with the valves in accordance with the prior art (broken line curves) is already at the consistency of 10 % weak. In other words a big pressure difference is required for the efficiency of the flow to reach a profitable value. At the consistency of 15 % the pressure difference required is even bigger.
  • unbroken curve a considerably better efficiency is achieved and the maximum value achieved with considerably smaller pressure difference is, less than half of the corresponding pressure difference of a valve in accordance with the prior art.
  • valve and the fluidizing element are arranged in one and the same body, but, for example, for technical reasons in manufacture, it can be advantageous to construct the valve and the fluidizing element as separate components to be attached to each other. Furthermore, it is possible to reduce the pressure loss by arranging the form and function of the fluidizator and the valve element, in other words the rotational direction of the fluidizator, so that the pulp is subjected by the fluidizator to a kinetic component towards the valve opening.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Taps Or Cocks (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Pyrrole Compounds (AREA)
  • Endoscopes (AREA)
  • Inorganic Fibers (AREA)

Claims (14)

  1. Verfahren zur Verbesserung der Regulierung und Behandlung von Fasersuspensionströmung, wobei die Fasersuspension durch Drosselung der Querschnittsfläche der Strömung reguliert wird, dadurch gekennzeichnet, daß die Fasersuspension in nächster Nähe und in der Strömungsrichtung stromaufwärts von der Drosselstelle fluidisiert wird, wobei das Fasersuspension-Strömungsgut Scherkräften ausgesetzt wird, durch die die Bindungen zwischen den Fasern der Suspension gelöst werden und die Bildung von Faserbündeln an der Drosselstelle verhindert wird, und die Fasersuspension in flüssigem Zustand durch die Drosselstelle fließt.
  2. Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, daß Chemikalien in die Fasersuspensionströmung bevor dessen Fluidisierung oder in Verbindung damit eingegeben werden, wobei die Chemikalien in Zusammenhang mit der Fluidisierung mit der Fasersuspension vermischt werden.
  3. Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, daß die Drosselstelle bei der Fluidisierung der Fasersuspensionströmung Druckimpulsen ausgesetzt wird, die in der entgegengesetzten Richtung zur Hauptströmung der Fasersuspension wirken, um die an den Rändern der Drosselstelle festgesetzten Fasern zu lösen.
  4. Vorrichtung zur Regulierung und Behandlung einer Fasersuspensionströmung, bestehend aus einem Körper (13) mit einer Eintritts- und Austrittsöffnung darin, und einer Drosselstelle in der Querschnittsfläche der Strömung, dadurch gekennzeichnet, daß ein Fluidisierungselement (22) in nächster Nähe der Drosselstelle angeordnet ist und die Fasersuspension in der Strömungsrichtung stromaufwärts von der Drosselstelle fluidisiert, um Geflechte und Flocken der Fasersuspension zu eliminieren.
  5. Vorrichtung gemäß Anspruch 4, dadurch gekennzeichnet, daß die Drosselstelle mit einer Drosselöffnung (16) und einem Drosselelement (19) versehen ist.
  6. Vorrichtung gemäß Anspruch 5, dadurch gekennzeichnet, daß das Fluidisierungselement (22) innerhalb des Körpers (13) in der Strömungsrichtung stromaufwärts vom Drosselelement (19) angeordnet ist.
  7. Vorrichtung gemäß Anspruch 5, dadurch gekennzeichnet, daß das Fluidisierungselement (22) innerhalb des Körpers (13) in der Strömungsrichtung stromabwärts vom Drosselelement (19) angeordnet ist.
  8. Vorrichtung gemäß Anspruch 4, dadurch gekennzeichnet, daß eine Öffnung (23) in der Fluidisierungszone angeordnet ist, durch welche Öffnung der Fasersuspensionströmung Chemikalien beigemischt werden.
  9. Vorrichtung gemäß Anspruch 8, dadurch gekennzeichnet, daß die Öffnug zur Eingabe von Chemikalien stromaufwärts von der Drosselstelle liegt.
  10. Vorrichtung gemäß Anspruch 4, dadurch gekennzeichnet, daß die Drosselstelle in Verbindung mit der Austrittsöffnung eines Eindickers, eines Pulpebehälters oder einer entsprechenden hochkonsistente Pulpe behandelnden Vorrichtung angeordnet ist.
  11. Vorrichtung gemäß Anspruch 5, dadurch gekennzeichnet, daß das Drosselelement (19) eine planförmige oder gewölbte Platte ist, deren der Eintrittsöffnung (14) zugewandte Oberfläche in Form hauptsächlich der Mantelfläche einer Umdrehung des Fluidisierungselements (22) entspricht.
  12. Vorrichtung gemäß Anspruch 4, dadurch gekennzeichnet, daß das Fluidisierungselement ein drehbarer Läufer ist.
  13. Vorrichtung gemäß Anspruch 5, dadurch gekennzeichnet, daß das Drosselelement (19) mit einem Anstriebsmechanismus (20) zum Schließen der Drosselöffnung (16) versehen ist.
  14. Vorrichtung gemäß Anspruch 5, dadurch gekennzeichnet, daß der Körper (13) ein Ventilkörper ist, daß die Drosselöffnung (16) eine Ventilöffnung ist, und daß das Drosselelement (19) ein Ventilelement ist.
EP88102569A 1987-02-23 1988-02-22 Verfahren und Vorrichtung zur Verbesserung der Behandlung einer Fasersuspension und zur Kontrolle des Fliessens einer Fasersuspension Expired - Lifetime EP0280234B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP93114759A EP0578284B1 (de) 1987-02-23 1988-02-22 Rührwerk zur Verbesserung der Verarbeitung von Fasernsuspension

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI870747A FI82499C (fi) 1987-02-23 1987-02-23 Anordning foer foerbaettring av reglering och behandling av fibersuspensionsstroemning.
FI870747 1987-02-23

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP93114759A Division EP0578284B1 (de) 1987-02-23 1988-02-22 Rührwerk zur Verbesserung der Verarbeitung von Fasernsuspension
EP93114759.9 Division-Into 1988-02-22

Publications (3)

Publication Number Publication Date
EP0280234A2 EP0280234A2 (de) 1988-08-31
EP0280234A3 EP0280234A3 (de) 1991-01-09
EP0280234B1 true EP0280234B1 (de) 1994-05-18

Family

ID=8523990

Family Applications (2)

Application Number Title Priority Date Filing Date
EP93114759A Expired - Lifetime EP0578284B1 (de) 1987-02-23 1988-02-22 Rührwerk zur Verbesserung der Verarbeitung von Fasernsuspension
EP88102569A Expired - Lifetime EP0280234B1 (de) 1987-02-23 1988-02-22 Verfahren und Vorrichtung zur Verbesserung der Behandlung einer Fasersuspension und zur Kontrolle des Fliessens einer Fasersuspension

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP93114759A Expired - Lifetime EP0578284B1 (de) 1987-02-23 1988-02-22 Rührwerk zur Verbesserung der Verarbeitung von Fasernsuspension

Country Status (7)

Country Link
EP (2) EP0578284B1 (de)
JP (1) JPS63288288A (de)
AT (2) ATE185704T1 (de)
CA (1) CA1313325C (de)
DE (3) DE280234T1 (de)
FI (1) FI82499C (de)
NO (1) NO178468B (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT403063B (de) * 1995-04-12 1997-11-25 Andritz Patentverwaltung Vorrichtung zum einmischen von chemikalien in eine faserstoffsuspension
SE532643C2 (sv) 2008-07-03 2010-03-09 Metso Paper Inc Förfarande och apparat för styrning av flöde av massasuspension
FR2997635A1 (fr) * 2012-11-05 2014-05-09 Spcm Sa Dispositif pour l'injection puis le melange de polymere dans une canalisation transportant une suspension de particules solides et procede mettant en œuvre le dispositif

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1066544B (de) * 1956-12-18 1959-10-08 Aschaffenburger Zellstoffwerke Vorrichtung zum Mischen von Fluessigkeiten untereinander oder mit Gasen oder von Stoffgemischen mit verschiedenen Konsistenzen in einem feststehenden, rohrfoermigen Gehaeuse mit einer in diesem umlaufenden Ruehrwelle
US4030969A (en) * 1972-06-13 1977-06-21 Defibrator Ab Method of dispersing a bleaching agent into a stream of fibrous cellulosic pulp material in a throttling nozzle
JPS6031554B2 (ja) * 1976-12-28 1985-07-23 日産自動車株式会社 塗装方法および装置
US4199266A (en) * 1977-08-31 1980-04-22 Giusti Raolo B Processing vessels
DE3033240A1 (de) * 1980-09-04 1982-04-01 Wolfgang 4200 Oberhausen Riese Segment- kugelhahn fuer silo-fahrzeuge
JPS6031554U (ja) * 1983-08-09 1985-03-04 株式会社　不二工機製作所 弁
US4662394A (en) * 1985-10-25 1987-05-05 Johnston Pump/General Valve, Inc. Tight shut-off valve with flow control element

Also Published As

Publication number Publication date
DE280234T1 (de) 1989-06-22
DE3856373D1 (de) 1999-11-25
JPH0240790B2 (de) 1990-09-13
NO880758D0 (no) 1988-02-22
EP0578284A2 (de) 1994-01-12
EP0578284B1 (de) 1999-10-20
ATE185704T1 (de) 1999-11-15
DE3889559T2 (de) 1994-09-29
FI870747A (fi) 1988-08-24
EP0280234A3 (de) 1991-01-09
FI870747A0 (fi) 1987-02-23
FI82499B (fi) 1990-11-30
NO178468B (no) 1995-12-27
FI82499C (fi) 1992-07-14
EP0578284A3 (en) 1997-03-12
NO880758L (no) 1989-08-23
CA1313325C (en) 1993-02-02
DE3889559D1 (de) 1994-06-23
EP0280234A2 (de) 1988-08-31
DE3856373T2 (de) 2000-03-23
JPS63288288A (ja) 1988-11-25
ATE105884T1 (de) 1994-06-15

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