CH437217A - Means for continuously producing solutions and suspensions - Google Patents

Means for continuously producing solutions and suspensions

Info

Publication number
CH437217A
CH437217A CH1769665A CH1769665A CH437217A CH 437217 A CH437217 A CH 437217A CH 1769665 A CH1769665 A CH 1769665A CH 1769665 A CH1769665 A CH 1769665A CH 437217 A CH437217 A CH 437217A
Authority
CH
Switzerland
Prior art keywords
suspensions
mixing device
means
device
housing
Prior art date
Application number
CH1769665A
Other languages
German (de)
Inventor
Walter Dipl Ing Gresch
Pilch Horst
Ruettener Erwin
Original Assignee
Buss Ag
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 Buss Ag filed Critical Buss Ag
Priority to CH1769665A priority Critical patent/CH437217A/en
Publication of CH437217A publication Critical patent/CH437217A/en

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING
    • B01F15/00Accessories for mixers ; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F15/02Feed or discharge mechanisms
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING
    • B01F13/00Other mixers; Mixing plant, including combinations of mixers, e.g. of dissimilar mixers
    • B01F13/10Mixing plant, including combinations of mixers, e.g. of dissimilar mixers
    • B01F13/1025Combinations of dissimilar mixers
    • B01F13/1027Combinations of dissimilar mixers with consecutive receptacles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING
    • B01F13/00Other mixers; Mixing plant, including combinations of mixers, e.g. of dissimilar mixers
    • B01F13/10Mixing plant, including combinations of mixers, e.g. of dissimilar mixers
    • B01F13/1041Mixing plant, including combinations of mixers, e.g. of dissimilar mixers comprising mixers specially adapted for mixing in combination with disintegrating
    • B01F13/1047Devices with consecutive working receptacles, e.g. with two intermeshing tools in one of the receptacles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING
    • B01F7/00Mixers with rotary stirring devices in fixed receptacles, i.e. movement of the receptacle not being meant to effect the mixing; Kneaders
    • B01F7/02Mixers with rotary stirring devices in fixed receptacles, i.e. movement of the receptacle not being meant to effect the mixing; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F7/08Mixers with rotary stirring devices in fixed receptacles, i.e. movement of the receptacle not being meant to effect the mixing; Kneaders with stirrers rotating about a horizontal or inclined axis with helices or sections of helices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00Mixing; Kneading
    • B29B7/30Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/40Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft
    • B29B7/42Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft with screw or helix
    • B29B7/426Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft with screw or helix with consecutive casings or screws, e.g. for charging, discharging, mixing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/285Feeding the extrusion material to the extruder
    • B29C48/286Raw material dosing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/285Feeding the extrusion material to the extruder
    • B29C48/29Feeding the extrusion material to the extruder in liquid form
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/36Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/375Plasticisers, homogenisers or feeders comprising two or more stages
    • B29C48/38Plasticisers, homogenisers or feeders comprising two or more stages using two or more serially arranged screws in the same barrel
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/36Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING
    • B01F15/00Accessories for mixers ; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F15/02Feed or discharge mechanisms
    • B01F15/0201Feed mechanisms
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0005Condition, form or state of moulded material or of the material to be shaped containing compounding ingredients
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S516/00Colloid systems and wetting agents; subcombinations thereof; processes of
    • Y10S516/924Significant dispersive or manipulative operation or step in making or stabilizing colloid system
    • Y10S516/929Specified combination of agitation steps, e.g. mixing to make subcombination composition followed by homogenization
    • Y10S516/931High shear followed by low shear

Description


  
 



   Einrichtung zum kontinuierlichen Herstellen von Lösungen und Suspensionen Means for continuously producing solutions and suspensions
 Die vorliegende Erfindung bezieht sich auf leine liin- richtung zum kontinuierlichen Herstellen von Lösungen und Suspensionen. The present invention relates to leash liin- direction for the continuous production of solutions and suspensions.



    Kontinuierliche Löseprozesse sind mittels Schnekkenmaschinen verschiedener Bauart durchführbar. Continuous dissolving processes are carried out by means of various types Schnekkenmaschinen.  Dabei wurde jedoch als nachteilig empfunden, dass beim Dosieren im Einfüllbereich oft grössere Agglomerate entstehen, die vom Lösemittel umhüllt werden und den weiteren Lösevorgang erschweren. However, it was felt to be disadvantageous that arise when metering in the filling often larger agglomerates which are coated on the solvent and impede further dissolution process.  Nur durch Aufbringen von relativ grossen Scherkräften sind die gallertartigen Häute abzureiben, um dadurch neue Oberflächen für die Lösemittelpenetration frei zu legen. Only by the application of relatively high shearing forces the gelatinous skins are abrade to expose new surfaces to thereby for solvent penetration.  Dazu ist jedoch grosser technischer Aufwand nötig und oft müssen spezielle Reibelemente Anwendung finden. This, however, great technical effort is needed and often have special friction apply.  Bei der Herstellung von Suspensionen stellen sich oft ähnliche Probleme. In the production of suspensions often face similar problems.



    Es wird angestrebt, eine Einrichtung vorzuschlagen, bei welcher bei separater Dosierung der Flüssigkeitskomponenten die Bildung von Agglomeraten verhindert wird, so dass diese mit bekannten Schneckenmaschinen verarbeitet werden können. It is desirable to propose a device in which at separate metering of the liquid components preventing the formation of agglomerates so that they can be processed with known screw machines.



    Die erfindungsgemässe Einrichtung zum kontinuierTi- chen Herstellen von Lösungen und Suspensionen weist eine Knetvorrichtung und eine der Knetvorrichtung vorgeschaltete rotierende Mischvorrichtung auf, welche mit einer höheren Drehzahl als die Knetvorrichtung arbeitet. The inventive means for kontinuierTi- chen preparing solutions and suspensions includes a kneader and a kneading machine upstream the rotating mixing device operating at a higher speed than the kneader.



   Zweckmässigerweise kann die Mischvorrichtung eine rotierende mit Misch- und Zerkleinerungsorganen versehene vertikale Welle aufweisen. Conveniently, the mixing device may comprise a rotating provided with mixing and comminuting elements vertical shaft.  Auf beiliegender Zeichnung ist ein Ausführungsbeispiel des Erfindungsgegenstandes schematisch dargestellt. In the attached drawings an embodiment of the subject invention is schematically shown.



    Die dargestellte Einrichtung zum kontinuierlichen Durchführen von Löseprozessen weist eine Knetvorrichtung 1 auf, welche eine in einem Gehäuse 2 rotierende Schnecke 3 besitzt, die mittels eines in einem Gehäuse 4 angeordneten nicht dargestellten Motors über ein Getriebe angetrieben wird. Means for continuously performing solving processes illustrated comprises a kneader to 1, which has a rotating screw 2 in a housing 3 which is driven by means of an in a housing 4 is not shown motor via a transmission.  An die Einfüllöffnung des Gehäuses 2 ist eine Mischvorrichtung 5 mit ihrer Austrittsdüse 6 angeschlossen. At the filling opening of the housing 2 a mixing apparatus 5 is connected with its outlet nozzle. 6  Die Mischvorrichtung weist eine in einem vertikalen Gehäuse 7 langeordnete Welle 8 auf, die mit Mlisch-und Zerkleinerungsorganen 9 ausgerüstet ist. The mixing device has a long arranged in a vertical housing 7 shaft 8 which is equipped with Mlisch and comminuting elements. 9  Die Misch- und Zerkleinerungsorgane 9 sind entlang der Welle radial verteilt. The mixing and comminuting elements 9 are distributed along the shaft radially.  Zum Antrieb der Welle 8 dient ein Elektromotor 10, welcher am oberen aus dem Gehäuse 7 herausragenden Ende der Welle 8 befestigt ist. To drive the shaft 8 of an electric motor 10 is used which is attached at the top protruding from the housing 7 end of the shaft. 8

    Die Welle 8 rotiert mit mehrfach erhöhten Drehzahlen gegenüber der Schnecke 3. The shaft 8 rotates at several times higher speed compared to the screw. 3



    Die Feststoffe, welche in einer Flüssigkeit gelöst werden sollen, befinden sich in einem Behälter 11 und gelangen mittels eines Förderbandes oder Dosierwaage 12 durch den Einfüllstutzen 13 in die Mischvorrichtung. The solids which are to be dissolved in a liquid, located in a container 11 and pass by means of a conveyor belt or weigh feeder 12 through the filler neck 13 in the mixing device.



   Der Einfüllstutzen 13 der Mischvorrichtung ist am oberen Teil des Gehäuses 7 angeordnet Die pulverförmigen Feststoffe werden im Gehäuse 7 von den rotierenden flügelartigen Misch- und Zerkleinerungsorganen erfasst und in wirbelnde Bewegung versetzt. The filler neck 13 of the mixing device is arranged at the upper part of the housing 7. The powdered solids are collected in the housing 7 of the rotating wing-like mixing elements and comminuting elements and displaced in whirling motion.  Die Flüssigkeit wird aus einem Behälter 14 mittels einer Leitung 15 über eine Dosierpumpe 17 in das Gehäuse 7 eingeführt. The liquid is introduced from a container 14 via a conduit 15 via a metering pump 17 in the housing. 7  An Stelle der einzigen Leitung 15, können weitere aus der Leitung 15 abzweigende Leitung vorhanden sein, die an verschiedenen Umfangsstellen in das Gehäuse 7 münden. Instead of the single line 15 further branches off from the line 15 line may be present, which open at different peripheral locations into the housing. 7  Das benetzte oder angeteigte Material wird zwangläufig oder durch die Schwerkraft nach unten gefördert, wobei die relativ lockeren Agglomerate zerschlagen werden. The wetted or made-material is conveyed positively, or by the force of gravity, the relatively loose agglomerates are crushed.

    Zur Unterstützung dieser Wirkung können im Gehäuse 7 noch Statorelemente 16 vorhanden sein, welche mit den Misch- und Zerkleinerungsorganen 9 zusammenwirken. To support this action stator 16 may be provided, which cooperate with the mixing and comminuting elements 9 in the housing 7 yet.  Durch die Düse 6 tritt ein Gemenge in die Knetvorrichtung 1 ein, welches in dieser ohne Schwierigkeiten weiter verarbeitet wird. Through the nozzle 6 a mixture enters the kneading device 1, which is further processed in this without difficulty.



    Die beschriebene Einrichtung ist z. The device described is, for.  B. besonders geeignet zur Lösung von Polyacrylnitril in Dimethylfornamid, von Acetyl-Cellulose in Aceton, PVC in Cyclohexanon usw. und Herstellung von Suspensionen z. B. particularly suitable for the solution of polyacrylonitrile in Dimethylfornamid, of acetyl cellulose in acetone, PVC in cyclohexanone, etc., and for the preparation of suspensions.  B. aus Therephthalsäure und Glykol, wobei die Verweilzeit des Produktes in der kontinuierlichen gegenüber der chargenweise arbeitenden Einrichtung wesentlich herabgesetzt werden kann. For example, from terephthalic acid and glycol, wherein the residence time of the product can be substantially reduced in continuous relation to the batch-type device.  Dadurch wird die Qualität des Produktes verbessert und beispielsweise ;bei der Lö sung von Polyacrylnitril in Dimethylfornamid d die sonst auftretende Gelbfärbung wesentlich herabgesetzt oder sogar ganz verhindert. Thereby, the quality of the product is improved and, for example, in the Lö solution of polyacrylonitrile in Dimethylfornamid d which would otherwise occur yellowing substantially reduced or even completely prevented. 

Claims (1)

  1. PATENTANSPRUCH Einrichtung zur kontinuierlichen Herstellung von Lösungen und Suspensionen, dadurch gekennzeichnet, dass dieselbe aus einer Knetvorrichtung und einer dieser vorgeschalteten rotierenden Mischvorrichtung besteht, welche mit einer mehrfach erhöhten Drehzahl gegen über der Knetvorrichtung rotiert. Claim device for the continuous production of solutions and suspensions, characterized in that the same consists of a kneader, and one of these upstream rotating mixing device which rotates at a speed several times higher compared to the kneader.
    UNTERANSPRÜCHE 1. Einrichtung nach Patentanspruch, dadurch gekennzeichnet, dass die Mischvorrichtung (5) eine rotierende mit Misch- und Zerkleinerungsorganen (9) versehene vertikale Welle (8) aufweist. That the mixing device (5) comprises the sub-claims 1. A device according to claim, characterized in that a rotating mixing and provided with comminuting elements (9), vertical shaft (8).
    2. Einrichtung nach Patentanspruch und Unteranspruch 1, Idadurch gekennzeichnet, dass die Mischvorrichtung separate Zuführstellen zur dosierten Zuführung der zu mischenden Elemente besitzt. 2. Apparatus according to claim 1 and dependent claim, Idadurch in that the mixing device having separate supply locations for the metered feed to be mixed elements.
    3. Einrichtung nach Patentanspruch und Unteransprüchen 1 und 2, dadurch gekennzeichnet, dass im Gehäuse der Mischvorrichtung Statorelemente (16) vorhanden sind, welche mit Iden Zerkleinerungsorganen zusammenwirken. That are present in the housing of the mixing device stator (16) which cooperate 3. Apparatus according to claim 1 and dependent claims and 2, characterized with Iden comminuting elements.
CH1769665A 1965-12-20 1965-12-20 Means for continuously producing solutions and suspensions CH437217A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CH1769665A CH437217A (en) 1965-12-20 1965-12-20 Means for continuously producing solutions and suspensions

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
CH1769665A CH437217A (en) 1965-12-20 1965-12-20 Means for continuously producing solutions and suspensions
SE16966/66A SE334143B (en) 1965-12-20 1966-12-12
AT1147566A AT274742B (en) 1965-12-20 1966-12-13 Process for the continuous preparation of solutions and suspensions, and means for carrying out the method
FR87812A FR1506697A (en) 1965-12-20 1966-12-16 Apparatus for the continuous production of solutions and suspensions
BR185479/66A BR6685479D0 (en) 1965-12-20 1966-12-19 Installation for the preparation of solutions and suspensions continues
NL6617778A NL6617778A (en) 1965-12-20 1966-12-19
BE691483D BE691483A (en) 1965-12-20 1966-12-20
US875962A US3647493A (en) 1965-12-20 1969-11-12 Method and apparatus for continuously producing solutions and suspensions

Publications (1)

Publication Number Publication Date
CH437217A true CH437217A (en) 1967-06-15

Family

ID=4427386

Family Applications (1)

Application Number Title Priority Date Filing Date
CH1769665A CH437217A (en) 1965-12-20 1965-12-20 Means for continuously producing solutions and suspensions

Country Status (8)

Country Link
US (1) US3647493A (en)
AT (1) AT274742B (en)
BE (1) BE691483A (en)
BR (1) BR6685479D0 (en)
CH (1) CH437217A (en)
FR (1) FR1506697A (en)
NL (1) NL6617778A (en)
SE (1) SE334143B (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2701542C2 (en) * 1977-01-15 1985-09-12 Dietrich Dipl.-Ing. 6240 Koenigstein De Maurer
US4211574A (en) * 1977-07-26 1980-07-08 Akzona Incorporated Process for making a solid impregnated precursor of a solution of cellulose
US4144080A (en) * 1977-07-26 1979-03-13 Akzona Incorporated Process for making amine oxide solution of cellulose
US4428852A (en) * 1982-01-18 1984-01-31 E. I. Du Pont De Nemours And Company Continuous synthesis of chromium dioxide
PL142347B1 (en) * 1984-02-28 1987-10-31 Flow-through mixer
US4778835A (en) * 1985-12-09 1988-10-18 Eastman Kodak Company Process and apparatus for preparing polyester dissipations
DE3601324A1 (en) * 1986-01-17 1987-07-23 Wacker Chemie Gmbh A process for the continuous production of room temperature vulcanizable silicone compositions
DE4027888A1 (en) * 1990-09-03 1992-03-05 Stoess & Co Gelatine Method for continuously releasing gelatine
DE4227542A1 (en) * 1992-08-20 1994-02-24 Werner Kempter Device for producing a cross-linked extruded product
US6414054B1 (en) 1999-12-21 2002-07-02 General Electric Company Continuous preparation of heat-vulcanizable silicone compositions
EP2446957B1 (en) * 2005-09-28 2016-05-18 China Tobacco Hunan Industrial Corporation Device for adding tobacco dust in production process of papermaking tobacco sheet
WO2011146896A2 (en) * 2010-05-21 2011-11-24 Kinetikgruppen Sverige Ab Comminution reactor

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3160352A (en) * 1959-06-15 1964-12-08 Gilman B Mollring Apparatus for pulverizing and dispersing solid material into liquid suspension

Also Published As

Publication number Publication date
SE334143B (en) 1971-04-19
US3647493A (en) 1972-03-07
FR1506697A (en) 1967-12-22
NL6617778A (en) 1967-06-21
BE691483A (en) 1967-05-29
BR6685479D0 (en) 1973-12-27
AT274742B (en) 1969-09-25

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