DE69226335D1 - Verbessertes Extrusionsverfahren und Vorrichtung zum Herstellen von Gegenständen aus pulverigem Material - Google Patents

Verbessertes Extrusionsverfahren und Vorrichtung zum Herstellen von Gegenständen aus pulverigem Material

Info

Publication number
DE69226335D1
DE69226335D1 DE69226335T DE69226335T DE69226335D1 DE 69226335 D1 DE69226335 D1 DE 69226335D1 DE 69226335 T DE69226335 T DE 69226335T DE 69226335 T DE69226335 T DE 69226335T DE 69226335 D1 DE69226335 D1 DE 69226335D1
Authority
DE
Germany
Prior art keywords
extrusion process
powdery material
making articles
improved extrusion
improved
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 - Fee Related
Application number
DE69226335T
Other languages
English (en)
Other versions
DE69226335T2 (de
Inventor
Clarence Edward Ford
Lucretia Rita Quatrini
Donald Lloyd Guile
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.)
Corning Inc
Original Assignee
Corning Inc
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 Corning Inc filed Critical Corning Inc
Publication of DE69226335D1 publication Critical patent/DE69226335D1/de
Application granted granted Critical
Publication of DE69226335T2 publication Critical patent/DE69226335T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
    • B22F3/227—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by organic binder assisted extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
    • B28B3/22—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded by screw or worm
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
    • B28B3/22—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded by screw or worm
    • B28B3/224—Twin screw extruders, e.g. double shaft extruders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
    • B28B3/26—Extrusion dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
    • B28B3/26—Extrusion dies
    • B28B3/2609—Containing rotating elements perpendicular to the axis of extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion 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
    • B29C48/04—Particle-shaped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/365—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using pumps, e.g. piston pumps
    • B29C48/37—Gear pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/375—Plasticisers, homogenisers or feeders comprising two or more stages
    • B29C48/385—Plasticisers, homogenisers or feeders comprising two or more stages using two or more serially arranged screws in separate barrels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/375—Plasticisers, homogenisers or feeders comprising two or more stages
    • B29C48/387—Plasticisers, homogenisers or feeders comprising two or more stages using a screw extruder and a gear pump
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means 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
    • B29C48/397—Means 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 using a single screw
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means 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
    • B29C48/40—Means 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 using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/76—Venting, drying means; Degassing means
    • 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
    • B30B11/245—Extrusion presses; Dies therefor using screws or worms using two or more screws working in different chambers
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B19/00—Other methods of shaping glass
    • C03B19/06—Other methods of shaping glass by sintering, e.g. by cold isostatic pressing of powders and subsequent sintering, by hot pressing of powders, by sintering slurries or dispersions not undergoing a liquid phase reaction
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/0128—Manufacture of preforms for drawing fibres or filaments starting from pulverulent glass
    • C03B37/01288—Manufacture of preforms for drawing fibres or filaments starting from pulverulent glass by extrusion, e.g. of glass powder and binder
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
    • C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
    • C04B35/195—Alkaline earth aluminosilicates, e.g. cordierite or anorthite
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Structural Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Rotary Pumps (AREA)
DE69226335T 1991-12-02 1992-10-22 Verbessertes Extrusionsverfahren und Vorrichtung zum Herstellen von Gegenständen aus pulverigem Material Expired - Fee Related DE69226335T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/801,361 US5213737A (en) 1991-12-02 1991-12-02 Extrusion method and apparatus for producing a body from powder material

Publications (2)

Publication Number Publication Date
DE69226335D1 true DE69226335D1 (de) 1998-08-27
DE69226335T2 DE69226335T2 (de) 1998-12-03

Family

ID=25180900

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69226335T Expired - Fee Related DE69226335T2 (de) 1991-12-02 1992-10-22 Verbessertes Extrusionsverfahren und Vorrichtung zum Herstellen von Gegenständen aus pulverigem Material

Country Status (6)

Country Link
US (1) US5213737A (de)
EP (1) EP0545056B1 (de)
JP (1) JPH05220803A (de)
KR (1) KR100244445B1 (de)
BR (1) BR9204639A (de)
DE (1) DE69226335T2 (de)

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Publication number Priority date Publication date Assignee Title
CH687842A5 (fr) * 1994-04-28 1997-03-14 Nestle Sa Procédé de fabrication de pâtes alimentaires.
US5997934A (en) * 1995-04-28 1999-12-07 Nestec S.A. Manufacture of cooked cereals
IN181843B (de) * 1995-04-28 1998-10-03 Nestle Sa
TW309619B (de) 1995-08-15 1997-07-01 Mourns Multifuse Hong Kong Ltd
DE19703798C2 (de) 1997-02-01 2000-01-27 Berstorff Gmbh Masch Hermann Zahnradextruder
DE29710235U1 (de) * 1997-06-12 1997-08-14 Battenfeld Extrusionstech Vorrichtung zum Plastifizieren von Kunststoffmaterial
EP0894594A3 (de) * 1997-07-24 1999-03-10 Mitsubishi Chemical MKV Company Verfahren zum Herstellen von Granulat oder Formkörper auf Vinylchloridharzbasis
US6375450B1 (en) * 2000-03-17 2002-04-23 Corning Incorporated Extrusion apparatus for ceramic honeycomb articles
TW482715B (en) * 2000-03-28 2002-04-11 Isamu Kawakami Extruder nozzle, extruder and extrusion method
US6860257B2 (en) * 2003-01-03 2005-03-01 James L. Wood Processing apparatus and method
US20070243409A1 (en) * 2004-03-19 2007-10-18 Denki Kagaku Kogyo Kabushiki Kaisha Process for Producing Ceramic Sheet, Ceramic Substrate Utilizing The Same and Use Thereof
CA2608760A1 (en) * 2005-05-23 2006-11-30 Cornell Research Foundation Method and system for performing an interfacial reaction in a microfluidic device
US20070109911A1 (en) 2005-11-16 2007-05-17 Neubauer Anthony C High speed and direct driven rotating equipment for polyolefin manufacturing
WO2007122680A1 (ja) 2006-04-13 2007-11-01 Ibiden Co., Ltd. 押出成形機、押出成形方法及びハニカム構造体の製造方法
US8119234B2 (en) * 2008-02-29 2012-02-21 Corning Incorporated Anisotropic porous ceramic article and manufacture thereof
US8808601B2 (en) * 2008-05-30 2014-08-19 Corning Incorporated Method for manufacturing ceramic filter
DE102009033532B4 (de) * 2009-07-10 2020-11-19 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Extruder zur Herstellung eines Bauteils aus Leichtmetall
CN102328338A (zh) * 2011-09-05 2012-01-25 吴汉梁 一种陶瓷沙岩的成型方法及其专用设备
CN103770135B (zh) * 2012-10-17 2016-04-06 中国人民解放军理工大学 闭环联动式切丝装置
JP6227251B2 (ja) * 2013-01-10 2017-11-08 株式会社石川時鐵工所 押出成型機及び押出成型方法
EP3083188B1 (de) * 2013-12-20 2021-08-25 Pirelli Tyre S.p.A. Verfahren und vorrichtung zur kontinuierlichen herstellung eines halbzeugs für die herstellung von selbstdichtenden reifen
CN104149195A (zh) * 2014-07-31 2014-11-19 广西北流仲礼瓷业有限公司 一种多级练泥机
ES2862979T3 (es) * 2018-05-02 2021-10-08 Buss Ag Máquina mezcladora y amasadora y su uso
CN109605709A (zh) * 2018-12-17 2019-04-12 重庆平祥塑料有限公司 一种塑料挤出机
CN112192715B (zh) * 2020-10-09 2021-10-12 严雨婷 一种陶瓷用摞泥装置
CN113427606A (zh) * 2021-06-28 2021-09-24 池州瑞宏建筑材料有限公司 一种生态装饰墙板的制造工艺

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FR674299A (fr) * 1929-04-30 1930-01-27 Renou Freres Sa Des Ets Disposition à double sortie latérale pour machines à hélice servant à la poussée de produits céramiques en terre molle
DE632981C (de) * 1934-05-31 1936-07-17 Paul Radius Presskopf mit Presswalzen fuer Ziegelpressen
GB479204A (en) * 1936-08-07 1938-02-02 Richard Barker Improvements in or relating to extruding machines for plastic materials, such as clay, shale or the like
US2683895A (en) * 1950-07-21 1954-07-20 Gen Motors Corp Extruder
US2767437A (en) * 1952-02-11 1956-10-23 Donald E Marshall Method of amalgamating and extruding soap
GB953733A (en) * 1960-02-25 1964-04-02 Wladyslaw Zalewski Improvements in and relating to devices for feeding plasticized synthetic plastic material to moulds
JPS5946763B2 (ja) * 1977-05-04 1984-11-14 日本碍子株式会社 ハニカムの押出し成型方法およびその装置
FR2478524A1 (fr) * 1980-03-18 1981-09-25 Andouart Yvette Installation pour le malaxage de matieres plastiques
US4364888A (en) * 1981-05-04 1982-12-21 Corning Glass Works Method and apparatus for extruding a honeycomb structure
JPS5887013A (ja) * 1981-11-18 1983-05-24 Japan Steel Works Ltd:The 連続混練造粒装置
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US5114643A (en) * 1991-02-13 1992-05-19 Corning Incorporated Fabrication of cordierite bodies

Also Published As

Publication number Publication date
EP0545056A1 (de) 1993-06-09
US5213737A (en) 1993-05-25
JPH05220803A (ja) 1993-08-31
KR100244445B1 (ko) 2000-02-01
BR9204639A (pt) 1993-07-13
DE69226335T2 (de) 1998-12-03
EP0545056B1 (de) 1998-07-22
KR930012226A (ko) 1993-07-20

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