MX168748B - Metodo y aparato para la produccion de caños con nervaduras - Google Patents

Metodo y aparato para la produccion de caños con nervaduras

Info

Publication number
MX168748B
MX168748B MX005649A MX564987A MX168748B MX 168748 B MX168748 B MX 168748B MX 005649 A MX005649 A MX 005649A MX 564987 A MX564987 A MX 564987A MX 168748 B MX168748 B MX 168748B
Authority
MX
Mexico
Prior art keywords
core
sleeve
mandrel
extrusion sleeve
production
Prior art date
Application number
MX005649A
Other languages
English (en)
Inventor
Jyri Jarvenkyla
Original Assignee
Uponer Ab Oy
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 Uponer Ab Oy filed Critical Uponer Ab Oy
Publication of MX168748B publication Critical patent/MX168748B/es

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D23/00—Producing tubular articles
    • B29D23/18—Pleated or corrugated hoses
    • 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
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • 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
    • B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
    • 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
    • B29C48/30—Extrusion nozzles or dies
    • 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
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/303—Extrusion nozzles or dies using dies or die parts movable in a closed circuit, e.g. mounted on movable endless support
    • 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
    • B29C48/92—Measuring, controlling or regulating
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92019—Pressure
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/34—Moulds or cores; Details thereof or accessories therefor movable, e.g. to or from the moulding station
    • B29C33/36—Moulds or cores; Details thereof or accessories therefor movable, e.g. to or from the moulding station continuously movable in one direction, e.g. in a closed circuit
    • 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
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • 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
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/885—External treatment, e.g. by using air rings for cooling tubular films
    • 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
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/908—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article characterised by calibrator surface, e.g. structure or holes for lubrication, cooling or venting
    • 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
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9115—Cooling of hollow articles
    • B29C48/912—Cooling of hollow articles of tubular films
    • 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
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2016/00—Articles with corrugations or pleats
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/003—Tubular articles having irregular or rough surfaces

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Forging (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Harvesting Machines For Root Crops (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
  • Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
  • General Factory Administration (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Heat Treatment Of Articles (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • External Artificial Organs (AREA)
  • Blast Furnaces (AREA)

Abstract

La presente invención se refiere a un aparato para la producción de caños hechos de un material plástico y que tienen una cara externa provista con filetes o nervaduras anulares y una cara interna fija, comprendiendo dicho aparato un manguito de extrusión; un núcleo dispuesto en la línea central del manguito de extrusión y que comprende un vástago dispuesto dentro del manguito, un mandril que sobresale desde el manguito y que comprende una parte que tiene una forma sustancialmente cónica y cuyo diámetro aumento en el sentido de producción, y un alma de diámetro sustancialmente constante y que forma una prolongación del mandril, de modo que el núcleo forma con el manguito de extrusión un canal tubular, el que está en comunicación con un dispositivo suministrador de material plástico; y medios moldeadores que rodean el manguito de extrusión y dicho núcleo y que están dispuestos formando una fila sinfin que se mueve en el sentido de producción, y la superficie interna de dichos medios moldeadores enfriadores está provista con acanaladuras para formar las nervaduras en el caño, caracterizado por el hecho de que el volumen de carrera de un espacio anular definido por un plano que se extiende transversalmente hasta la línea central de dicho núcleo y en la adyacencia de una cara de extremo de dicho manguito de extrusión, una superficie de dicho mandril, y un plano que comprende la superficie envolvente de dicha alma, corresponde sustancialmente al volumen de llenado combinado de aquellas acanaladuras de dichos medios de moldeo que están dispuestas en dicho mandril en cada momento particular.
MX005649A 1986-03-20 1987-03-20 Metodo y aparato para la produccion de caños con nervaduras MX168748B (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI861172A FI77405C (fi) 1986-03-20 1986-03-20 Foerfarande och anordning foer framstaellning av kamflaensroer.

Publications (1)

Publication Number Publication Date
MX168748B true MX168748B (es) 1993-06-07

Family

ID=8522333

Family Applications (1)

Application Number Title Priority Date Filing Date
MX005649A MX168748B (es) 1986-03-20 1987-03-20 Metodo y aparato para la produccion de caños con nervaduras

Country Status (36)

Country Link
US (1) US4721594A (es)
EP (1) EP0237900B1 (es)
JP (1) JPS62230442A (es)
KR (1) KR950000191B1 (es)
CN (1) CN1006969B (es)
AT (1) ATE48560T1 (es)
AU (1) AU593875B2 (es)
BG (1) BG48208A3 (es)
BR (1) BR8701240A (es)
CA (1) CA1268615A (es)
CS (1) CS273323B2 (es)
DD (1) DD255506A5 (es)
DE (2) DE3632225A1 (es)
DK (1) DK162926C (es)
EG (1) EG18129A (es)
ES (1) ES2011780B3 (es)
FI (1) FI77405C (es)
GR (2) GR890300069T1 (es)
GT (1) GT198700013A (es)
HU (1) HU206849B (es)
IE (1) IE60194B1 (es)
IL (1) IL81935A (es)
IN (1) IN169391B (es)
IS (1) IS1471B6 (es)
MA (1) MA20914A1 (es)
MX (1) MX168748B (es)
MY (1) MY100581A (es)
NO (1) NO871106L (es)
NZ (1) NZ219682A (es)
PH (1) PH23756A (es)
PL (1) PL149530B1 (es)
PT (1) PT84506B (es)
SU (1) SU1570646A3 (es)
TR (1) TR23307A (es)
YU (1) YU44800B (es)
ZA (1) ZA871980B (es)

Families Citing this family (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3701822A1 (de) * 1987-01-22 1988-08-11 Uponor Nv Verfahren und anordnung zum strangpressen von kunststoffrohren
DE3779134D1 (de) * 1987-02-19 1992-06-17 Uponor Nv Verfahren und vorrichtung zur herstellung von gerippten rohren.
DE3725286A1 (de) * 1987-07-30 1989-02-09 Wilhelm Hegler Verfahren und vorrichtung zum herstellen eines rippen-rohres aus kunststoff
DE3737588C3 (de) * 1987-11-05 1993-12-23 Corma Inc Verfahren zum Herstellen eines innen glatten, außen gerippten Rohres aus extrudierbarem Kunststoff sowie Vorrichtung zur Durchführung des Verfahrens
US4808098A (en) * 1988-03-16 1989-02-28 Harry Chan Pipe extrusion die with a cooled and vacuumed additional mandrel
FI80234C (fi) * 1988-07-05 1990-05-10 Uponor Nv Anordning foer framstaellning av gallerkonstruktioner.
CA1303315C (en) * 1988-09-16 1992-06-16 Manfred A.A. Lupke Apparatus for producing pipe with annular ribs
FI85239C (fi) * 1989-07-12 1992-03-25 Uponor Nv Anordning foer framstaellning av kamflaensroer.
FI83187C (fi) * 1989-10-27 1991-06-10 Uponor Nv Produktionslinje foer sloeta plastroer.
FI87321C (fi) * 1989-10-27 1992-12-28 Uponor Nv Foerfarande och anordning foer tillverkning av kamflaensroer
FI905268A (fi) * 1990-10-25 1992-04-26 F I B Oy Roerdel och foerfarande foer dess tillverkning.
DE69121410T2 (de) * 1991-06-14 1997-02-20 Manfred Arno Alfred Lupke Maschine mit wanderndem formtunnel zur herstellung glattwandiger rohre
CA2056060A1 (en) * 1991-11-22 1993-05-23 Manfred A. A. Lupke Method of modifying corrugated or ribbed pipe to have a smooth outer wall
FI98137C (fi) * 1992-03-30 1997-04-25 Uponor Bv Menetelmä ja laite muoviputken orientoimiseksi sekä menetelmällä aikaansaatu orientoitu ripalaippamuoviputki
DE4240268A1 (de) * 1992-12-01 1994-06-09 Wilhelm Hegler Verfahren und Vorrichtung zur fortlaufenden Herstellung eines Verbundrohres mit einem außen im wesentlichen glatten Abschnitt
CA2204730A1 (en) * 1994-11-07 1996-05-17 Mark Alexander Jenkins Method of manufacturing resilient tubing
US5824351A (en) * 1996-07-05 1998-10-20 Lupke; Manfred A. A. Molding apparatus with non-reflective mold tunnels
US5925307A (en) * 1997-05-12 1999-07-20 Intevep, Sa. Method for forming oriented plastic pipe
DE19731804A1 (de) * 1997-07-24 1999-01-28 Bayerische Motoren Werke Ag Herstellverfahren für eine Zylinderbüchse einer Brennkraftmaschine
FI109188B (fi) 1998-12-23 2002-06-14 Uponor Innovation Ab Menetelmä haarallisen putken valmistamiseksi, putkenvalmistuslaite sekä haarallinen putki
US6877976B2 (en) * 2002-09-09 2005-04-12 Manfred A. A. Lupke Molding die for ribbed pipe
KR100816754B1 (ko) 2006-10-10 2008-03-25 삼성전자주식회사 반도체 장치의 패턴 형성 방법
US9505164B2 (en) 2009-12-30 2016-11-29 Schauenburg Technology Se Tapered helically reinforced hose and its manufacture
CN102019692B (zh) * 2009-09-17 2012-12-26 上海公元建材发展有限公司 一种加筋管成型模块上的筋形结构
EP2442320B1 (de) * 2010-10-15 2013-01-09 ABB Technology AG Form zum Herstellen von hohlzylinderähnlichen Formteilen
CN102179414A (zh) * 2011-03-07 2011-09-14 上海优控科技有限公司 一种新型的轧机刚度计算方法
US11370186B2 (en) * 2016-04-13 2022-06-28 Kongsberg Actuation Systems Ltd. Method and apparatus for forming a corrugated fluoropolymer tube
CN116001252B (zh) * 2023-03-27 2023-06-27 河北雄安顺财塑胶制品有限公司 内肋管缠绕成型用挤压定型辅助装置

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3298064A (en) * 1963-01-23 1967-01-17 Jun Taga Apparatus for molding synthetic resin bodies
US3751209A (en) * 1971-04-02 1973-08-07 Standard Oil Co Extrusion die with channeled die endplates
US3891007A (en) * 1972-07-03 1975-06-24 Dayco Corp Exteriorly corrugated hose of composite materials
US3919367A (en) * 1972-07-13 1975-11-11 Ernest J Maroschak Method for molding plastic pipe with enlarged portions formed therein
SE381001B (sv) * 1973-10-22 1975-11-24 Erik G W Nordstroem Forfarande och anordning for framstellning av kamflensror av plast
DE2362444C2 (de) * 1973-12-15 1983-06-01 Reifenhäuser KG, 5210 Troisdorf Vorrichtung zum Herstellen eines Rohres aus thermoplastischem Kunststoff mit Außenrippen und glattem Innenkanal
JPS587448B2 (ja) * 1974-09-25 1983-02-09 積水化学工業株式会社 アツニクブト ウスニクブトオ コウゴ ニユウスル ジユシカンノ セイゾウホウホウ
SE399206B (sv) * 1977-03-28 1978-02-06 Nordstroem Erik G W Anordning for framstellning av ror forsedda med flensar eller dylikt pa dess utsida
FR2424123A1 (fr) * 1978-04-24 1979-11-23 Armosig Procede et appareillage pour la fabrication en continu de profiles tubulaires ailetes en matiere synthetique
US4255107A (en) * 1978-05-26 1981-03-10 Advanced Drainage Systems, Inc. Control apparatus for producing uniform thickness corrugated tubing
US4305703A (en) * 1980-09-12 1981-12-15 Lupke Manfred Arno Alfred Composite die assembly for use in the production of thermoplastic tubing
CA1187258A (en) * 1982-12-02 1985-05-21 Lupke, Manfred A. A. Method and apparatus for forming a double walled thermoplastic tube with integral bells

Also Published As

Publication number Publication date
FI861172A (fi) 1987-09-21
GR3000382T3 (en) 1991-06-07
IL81935A0 (en) 1987-10-20
DK139987D0 (da) 1987-03-18
CN87101978A (zh) 1987-10-07
CA1268615A (en) 1990-05-08
IE60194B1 (en) 1994-06-15
TR23307A (tr) 1989-10-19
NO871106D0 (no) 1987-03-18
KR870008687A (ko) 1987-10-20
FI77405B (fi) 1988-11-30
AU7015587A (en) 1987-09-24
PT84506B (pt) 1989-11-10
PH23756A (en) 1989-11-03
ES2011780B3 (es) 1990-02-16
EP0237900A1 (en) 1987-09-23
MY100581A (en) 1990-12-15
DD255506A5 (de) 1988-04-06
YU44800B (en) 1991-02-28
DK162926C (da) 1992-05-25
IS1471B6 (is) 1991-09-24
BG48208A3 (bg) 1990-12-14
DK139987A (da) 1987-09-21
CS169687A2 (en) 1990-07-12
HUT48517A (en) 1989-06-28
YU48087A (en) 1988-06-30
GT198700013A (es) 1988-09-10
CN1006969B (zh) 1990-02-28
EP0237900B1 (en) 1989-12-13
PT84506A (en) 1987-04-01
JPH0568339B2 (es) 1993-09-28
NO871106L (no) 1987-09-21
EG18129A (en) 1992-08-30
JPS62230442A (ja) 1987-10-09
ATE48560T1 (de) 1989-12-15
AU593875B2 (en) 1990-02-22
FI861172A0 (fi) 1986-03-20
IE870709L (en) 1987-09-20
US4721594A (en) 1988-01-26
ZA871980B (en) 1987-11-25
FI77405C (fi) 1989-03-10
BR8701240A (pt) 1987-12-22
PL264744A1 (en) 1988-01-21
HU206849B (en) 1993-01-28
MA20914A1 (fr) 1987-10-01
KR950000191B1 (ko) 1995-01-11
DK162926B (da) 1991-12-30
IS3208A7 (is) 1987-09-21
PL149530B1 (en) 1990-02-28
IL81935A (en) 1991-04-15
GR890300069T1 (en) 1989-09-29
DE3632225A1 (de) 1987-09-24
CS273323B2 (en) 1991-03-12
IN169391B (es) 1991-10-12
DE3761124D1 (de) 1990-01-18
SU1570646A3 (ru) 1990-06-07
NZ219682A (en) 1989-05-29

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