EP0266516A2 - Sécheur, notamment pour l'industrie chimique - Google Patents

Sécheur, notamment pour l'industrie chimique Download PDF

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Publication number
EP0266516A2
EP0266516A2 EP87113091A EP87113091A EP0266516A2 EP 0266516 A2 EP0266516 A2 EP 0266516A2 EP 87113091 A EP87113091 A EP 87113091A EP 87113091 A EP87113091 A EP 87113091A EP 0266516 A2 EP0266516 A2 EP 0266516A2
Authority
EP
European Patent Office
Prior art keywords
chamber
housing
drying chamber
dryer according
ceiling part
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.)
Withdrawn
Application number
EP87113091A
Other languages
German (de)
English (en)
Other versions
EP0266516A3 (fr
Inventor
Günter Wulf
Heinz Geisenhof
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.)
Hermann Waldner GmbH and Co KG
Original Assignee
Hermann Waldner GmbH and Co KG
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 Hermann Waldner GmbH and Co KG filed Critical Hermann Waldner GmbH and Co KG
Publication of EP0266516A2 publication Critical patent/EP0266516A2/fr
Publication of EP0266516A3 publication Critical patent/EP0266516A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
    • F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
    • F26B9/066—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers the products to be dried being disposed on one or more containers, which may have at least partly gas-previous walls, e.g. trays or shelves in a stack
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/08—Humidity
    • F26B21/086—Humidity by condensing the moisture in the drying medium, which may be recycled, e.g. using a heat pump cycle

Definitions

  • the invention relates to a dryer, in particular for the chemical industry with the features of the preamble of claim 1.
  • Such a dryer is known from EP publication 60 212.
  • the fan cage in the ceiling part of the housing protrudes directly into the drying chamber and sucks in the gas flow from it.
  • the gas flow from the fan basket in the ceiling section as the main flow along the rear wall of the drying chamber is pushed downwards past the cover plate at the rear of the loading trolley.
  • the rear wall of the drying chamber is equipped with a heating device.
  • the main gas flow then flows through the loading trolley in the longitudinal direction.
  • In the ceiling part there is also a control device in the pressure-side chamber, which presses a secondary flow into the drying chamber along the side walls, on which condensers are located. Uncondensed parts of the secondary flow are sucked back by the fan on the intake side.
  • This dryer is very complicated according to its application and the resulting requirements.
  • the secondary gas flow is fed directly to the condensers, the gas flow heat imparted by the fan not being reduced by the material to be dried.
  • the invention has for its object to provide a simpler and more versatile dryer, which also enables better energy efficiency.
  • the invention offers the advantage that the gas stream is led over the goods to be dried as a largely laminar total stream without sharp deflections, as a result of which thermal energy is withdrawn. This reduces the energy required for cooling down and condensing.
  • the pressure-side and suction-side chambers in the ceiling part and the housing ensure a calming of the gas flow.
  • the entrained dust particles and the like can be retained by using filters.
  • an overpressure and a negative pressure are generated by the fan on the pressure side and suction side, which makes it possible to provide air inlets or gas outlets in the corresponding ceiling parts.
  • the loading trolley is kept free of baffles, it can be easily assembled. It is preferably constructed as a frame and is therefore free on all sides. With the dryer, both a recirculation mode and a fresh air mode are possible. Fresh air can be added to the desired extent in a controlled manner or a gas flow component can be discharged as exhaust air.
  • the dryer 1 has a housing 2 which is rectangular in cross section. This encloses a cuboid drying chamber 3.
  • the drying chamber 3 is delimited by the side walls 4, 5, the rear wall 6, the door 7, and the floor 8 and the ceiling 9.
  • a loading trolley 10 can be inserted into the cuboid drying chamber 3 through the door 7 and can fill the drying chamber 3 appropriately.
  • This carriage 10 has levels 11 supported by a frame, between which the trays (not shown) with the products to be dried can be inserted.
  • the dimensions of the trolley 10 provided with rollers 12, at least the side dimensions, are adapted to the cross section of the drying chamber 3.
  • the carriage 10 is at least open to the sides. However, the front and back are preferably also open.
  • the drying chamber 3 can also be designed so that it can accommodate several loading trolleys 10 side by side or one behind the other.
  • the side walls 4, 5 of the drying chamber 3 are formed by perforated sheets which are pivoted inwards for cleaning.
  • the holes 13 extend in rows of holes spaced apart from one another over the width of the side walls 4, 5. They extend in columns, at least over the height of the loading trolley 10.
  • the size of the holes 13 is dimensioned from row of holes to row of holes so that the the partial gas flows indicated by the arrows I in the transverse direction through the loading trolley 10 are approximately the same.
  • the side walls 4, 5 form with the housing side parts 14, 15 chambers 16, 17.
  • the top of the cuboid chambers 16, 17 can be closed off by filters 18, 19. Instead of filters, sheets, perforated sheets or the like which cause gas flow can also be present.
  • the other ends of the chambers 16, 17 form base parts 20, 21.
  • the side chambers 16, 17 with their side parts 14, 15, the side walls 4, 5, the filters 18, 19 and the bottom parts 20, 21 can be designed as separate building modules. They can be assembled in a constant size with drying chamber modules, the size of which is adapted to the respective application.
  • the housing 2 also has a ceiling part 22 which is firmly connected to the other housing parts.
  • the ceiling part 22 also has a rectangular plan. Its side walls continue housing parts 14, 15 upwards.
  • the cover part 22 has a housing part 23 which overlaps the filter 19 and the cover 9.
  • This housing part 23 is divided into a main chamber 25 and a secondary chamber 26 by a lying partition wall 24.
  • At least the main chamber 25 is provided with an adjustable, controllable flap 27 at its one entrance, via which gas flows in the direction indicated by the arrow.
  • a same flap can additionally be provided at the entrance to the secondary chamber 26.
  • a condenser 29 is arranged horizontally in the secondary chamber. This is formed by a pipe register through which cooling liquid flows. Below the condenser 29 there is a drip tray 30 for condensed water, which is only indicated schematically.
  • a gas outlet connection 31 with a control flap 32 is assigned to the space in front of the flap 27. If the flaps 27, 28 are closed, the entire gas flow can be discharged to the outside.
  • An outlet filter 33 can also be provided.
  • the chamber 25 opens upwards into an air inlet connection 34, which can be provided with a filter 35 and a control flap 36.
  • the required fresh air can be supplied via the connector 34 for "fresh air operation".
  • the chambers 25, 26 are provided on the suction side to form a fan basket 37 which is driven by an electric motor 38 and sucks gas in the direction of the arrow indicated via a suction opening 39, negative pressures arise in these. This enables controllable fresh air to be sucked in in the direction indicated by the arrow via the suction nozzle 34.
  • the suction opening 39 is followed by a housing part 40 which partially covers the housing part 23 and which surrounds the fan cage 37 and carries the electric motor 38. It continues into a pressure chamber 41 which widens in relation to the suction opening 39.
  • This pressure chamber 41 has in its downward chamber part a heating device 42. This is also formed by a tube register, which may be heated by superheated steam or the like.
  • the housing part 40 has an upward gas outlet connection 42, which is provided with a control flap 43 and optionally an outlet filter 44 for a gas outlet in the direction indicated by the arrow.
  • the dryer 1 is suitable both for "recirculation mode” and for operation with “partial or full fresh air”.
  • the dryer can be rendered inert, e.g. with nitrogen, which reduces the risk of explosion when drying, for example, products containing solvents.
  • the gas flow moved by the fan basket 37 into the large-sized pressure chamber 41 is heated via the heating device 42.
  • the easily removable filter 18 retains dust particles or the like entrained in the gas flow.
  • the gas stream flowing into the large-scale gas chamber 17 and being distributed there is distributed well via the side wall 4 formed by the perforated plate over the floors 11 and thus the goods to be dried in the loading trolley 10.
  • the temperature of the gas flow will vary between the tray plates carrying the goods lower the floors of the charging trolley 10 due to the evaporative cooling.
  • a gas bypass flow to the condenser 29 must be controlled.
  • the condensation power can be adjusted by the control flaps 27, 28.
  • the condenser 29 is preferably charged with cooling sole so that the temperature is reduced in advance.
  • the gas flow heating caused by the rotation of the fan cage 37 must also be taken into account in the dimensioning of the heating by the heating device 42. "Full fresh air operation" is also possible via the two stages 31 and 34, with fresh air replacing the circulated air quantity completely.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
EP87113091A 1986-11-05 1987-09-07 Sécheur, notamment pour l'industrie chimique Withdrawn EP0266516A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863637737 DE3637737A1 (de) 1986-11-05 1986-11-05 Trockner, insbesondere fuer die chemische industrie
DE3637737 1986-11-05

Publications (2)

Publication Number Publication Date
EP0266516A2 true EP0266516A2 (fr) 1988-05-11
EP0266516A3 EP0266516A3 (fr) 1989-03-29

Family

ID=6313254

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87113091A Withdrawn EP0266516A3 (fr) 1986-11-05 1987-09-07 Sécheur, notamment pour l'industrie chimique

Country Status (4)

Country Link
US (1) US4837945A (fr)
EP (1) EP0266516A3 (fr)
JP (1) JPS63123979A (fr)
DE (1) DE3637737A1 (fr)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2632714A1 (fr) * 1988-06-10 1989-12-15 Monteiro Daniel Four de sechage a air chaud pour la deshydratation de fruits ou legumes disposes sur des chariots a claies superposees, notamment pour la transformation de prunes vertes en pruneaux
EP0430910A1 (fr) * 1989-12-01 1991-06-05 Margaritelli - S.P.A. Installation de séchage artificiel du bois à cellule d'air chaud, pourvue d'un déflecteur lamellaire mobile pour interruption des courants internes d'air
EP0633996A1 (fr) * 1992-04-10 1995-01-18 DINH, Khanh Procede et secheur de sechage a boucle fermee
EP0775882A1 (fr) * 1995-11-21 1997-05-28 Hermann Waldner GmbH & Co. Sécheur, notamment pour l'industrie chimique ou pharmaceutique
WO1998019124A1 (fr) * 1996-10-28 1998-05-07 Hellmann-Hygrex Luft- Und Klimatechnik Gmbh Procede et dispositif pour secher des couches minces
FR2781180A1 (fr) * 1998-07-17 2000-01-21 Fours Et Bruleurs Rey Reacteur de retification du bois
WO2001031270A2 (fr) * 1999-10-27 2001-05-03 Skrotskaya Olga Panteleimonovn Installation de sechage et procede de sechage de bois
WO2006006837A1 (fr) * 2004-07-15 2006-01-19 Gordijs, Jevgenijs Procede de sechage de materiaux scies et sechoir conçu a cet effet
DE102005017187A1 (de) * 2005-04-13 2006-10-19 Lindauer Dornier Gmbh Durchlauftrockner in Mehretagenbauweise, insbesondere für plattenförmige Produkte
AT503635B1 (de) * 2006-05-10 2008-10-15 Wienerberger Ag Kammertrockner
EP1923649A3 (fr) * 2006-11-20 2009-10-28 Alfons Tschritter GmbH Procédé pour le séchage d'une matière à sécher ainsi qu'une installation pour la mise en oeuvre du procédé
RU2468319C2 (ru) * 2008-03-03 2012-11-27 Василий Андреевич Столяр Способ сушки древесины и установка для его осуществления
CN103673526A (zh) * 2013-04-18 2014-03-26 成都天磐科技有限责任公司 基于对材料进行烤干的装置
US9948549B2 (en) 2006-11-02 2018-04-17 Voip-Pal.Com, Inc. Producing routing messages for voice over IP communications

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5079855A (en) * 1991-02-15 1992-01-14 Carrier Associates, Inc. Drying chamber and air distribution means therefor
US5456022A (en) * 1992-01-13 1995-10-10 Jwi, Inc. Batch-type sludge drier
AU1249292A (en) * 1992-01-13 1993-08-03 Jwi, Inc. Batch-type sludge drier
US6203859B1 (en) * 1993-09-24 2001-03-20 Optimum Air Corporation Method of drying substrates and use thereof
US5878508A (en) * 1997-01-10 1999-03-09 American Harvest, Inc. Food dehydrator
DE10030383C1 (de) 2000-06-21 2001-10-04 Daimler Chrysler Ag Verfahren und Vorrichtung zum nicht-thermischen Trocknen von mit einem Wasserbasislack frisch lackierten Gegenständen, insbesondere Kraftfahrzeugkarosserien
JP4286712B2 (ja) * 2004-05-06 2009-07-01 パナソニック株式会社 衣類乾燥機
DE202005003791U1 (de) * 2005-02-28 2006-07-06 Hüttlin, Herbert, Dr. h.c. Apparatur zur Behandlung von partikelförmigem Gut
US20060283441A1 (en) * 2005-06-16 2006-12-21 Ming-Tsung Lee Oven with filter for filtering oil smoke
KR101255295B1 (ko) * 2005-11-28 2013-04-15 엘지디스플레이 주식회사 인쇄 장치 시스템 및 그를 이용한 패턴 형성 방법
KR100663842B1 (ko) * 2006-09-29 2007-01-04 박숙희 열풍건조기
EP2803924A1 (fr) * 2013-05-14 2014-11-19 Andreas Walter Kraus Procédé de déshydratation du moringa oleifera
CN103900356B (zh) * 2014-03-13 2016-04-20 甘肃金佑康药业科技有限公司 一种冷凝型热风循环烘干装置
KR101632013B1 (ko) * 2014-12-08 2016-06-21 엘지전자 주식회사 히트펌프 사이클을 구비한 응축식 의류 건조기 및 이의 제어방법
JP2017003240A (ja) * 2015-06-15 2017-01-05 株式会社ネスター 乾燥機
CN105371612A (zh) * 2015-12-24 2016-03-02 苏州北开生化设备有限公司 一种应用于物料快速烘干的热风循环烘箱及其工作方法
CN105731445B (zh) * 2016-04-25 2017-12-05 镇江博昊科技有限公司 一种高结晶度石墨薄膜材料干燥烘干线
CN107218775A (zh) * 2017-07-28 2017-09-29 南京研正干燥设备有限公司 一种热风穿流式干燥箱
US11852409B2 (en) * 2020-07-24 2023-12-26 Triple Green Products Inc. Use of biomass furnace for direct air-drying of grain and other particulate
CN112179063A (zh) * 2020-09-25 2021-01-05 河源职业技术学院 一种智能烘干数据采集器及烘干机

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE518379C (de) * 1931-02-14 Fritz Haas Trockenvorrichtung fuer pasten- und gallertartiges Gut, insbesondere feuchte Farbmassen
US1950006A (en) * 1929-12-06 1934-03-06 Lydon Timothy Heated furnace with heat recirculating means
FR1481846A (fr) * 1966-06-03 1967-05-19 Thermia Verken Ab Appareil de séchage
DE1729444A1 (de) * 1967-12-23 1972-02-24 Albert Piepenbring Trockner,vorzugsweise Kammertrockner
CH585379A5 (en) * 1974-08-23 1977-02-28 Felber Norbert Felix Timber drying plant with combined operating system - dries timber with heat pump air and air circulation to required dryness
DE2902369A1 (de) * 1979-01-22 1980-08-07 Happel Kg Einrichtung zum entfeuchten und temperieren der in einer trocknungskammer fuer die holztrocknung bewegten kammerluft
FR2453373A1 (fr) * 1979-04-02 1980-10-31 Valmet Oy Procede de recuperation de chaleur, base sur l'utilisation d'une pompe de chaleur
EP0047353A1 (fr) * 1980-09-05 1982-03-17 Ivo Coppa Procédé et installation de séchage pour produits et matériaux tels que le bois
EP0098462A1 (fr) * 1982-07-01 1984-01-18 Etablissements NEU Société Anonyme dite: Etuve ventilée
FR2563618A1 (fr) * 1982-11-02 1985-10-31 Shonetsugaku Kenkyusho Kk Procede de sechage utilisant le cycle de refrigeration, et appareil pour mettre en oeuvre ce procede
EP0060212B1 (fr) * 1981-03-09 1986-02-19 Schering Aktiengesellschaft Chambre de séchage à plateaux

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US31633A (en) * 1861-03-05 Shop-bin oe substitute fob
US3190011A (en) * 1960-12-05 1965-06-22 Noubar S Abdalian Clothes drier with vapor removal
US3831294A (en) * 1972-09-11 1974-08-27 Challenge Cook Bros Inc Means for controlling the drying of textiles and reclaiming the liquid therefrom
IT1160889B (it) * 1978-10-26 1987-03-11 Berti Furic Impianto di essiccazione particolarmente per legname
USRE31633E (en) * 1979-02-21 1984-07-24 Lumber conditioning kiln
FR2469124A1 (fr) * 1979-11-13 1981-05-22 Voegtlin Rene Four a recyclage d'air chaud pour la cuisson des produits de boulangerie, viennoiserie, patisserie et similaire
US4471537A (en) * 1982-01-18 1984-09-18 Indesit Industria Elettrodomestici Italiana S.P.A. Dryer apparatus having an improved air circulation

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE518379C (de) * 1931-02-14 Fritz Haas Trockenvorrichtung fuer pasten- und gallertartiges Gut, insbesondere feuchte Farbmassen
US1950006A (en) * 1929-12-06 1934-03-06 Lydon Timothy Heated furnace with heat recirculating means
FR1481846A (fr) * 1966-06-03 1967-05-19 Thermia Verken Ab Appareil de séchage
DE1729444A1 (de) * 1967-12-23 1972-02-24 Albert Piepenbring Trockner,vorzugsweise Kammertrockner
CH585379A5 (en) * 1974-08-23 1977-02-28 Felber Norbert Felix Timber drying plant with combined operating system - dries timber with heat pump air and air circulation to required dryness
DE2902369A1 (de) * 1979-01-22 1980-08-07 Happel Kg Einrichtung zum entfeuchten und temperieren der in einer trocknungskammer fuer die holztrocknung bewegten kammerluft
FR2453373A1 (fr) * 1979-04-02 1980-10-31 Valmet Oy Procede de recuperation de chaleur, base sur l'utilisation d'une pompe de chaleur
EP0047353A1 (fr) * 1980-09-05 1982-03-17 Ivo Coppa Procédé et installation de séchage pour produits et matériaux tels que le bois
EP0060212B1 (fr) * 1981-03-09 1986-02-19 Schering Aktiengesellschaft Chambre de séchage à plateaux
EP0098462A1 (fr) * 1982-07-01 1984-01-18 Etablissements NEU Société Anonyme dite: Etuve ventilée
FR2563618A1 (fr) * 1982-11-02 1985-10-31 Shonetsugaku Kenkyusho Kk Procede de sechage utilisant le cycle de refrigeration, et appareil pour mettre en oeuvre ce procede

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2632714A1 (fr) * 1988-06-10 1989-12-15 Monteiro Daniel Four de sechage a air chaud pour la deshydratation de fruits ou legumes disposes sur des chariots a claies superposees, notamment pour la transformation de prunes vertes en pruneaux
EP0430910A1 (fr) * 1989-12-01 1991-06-05 Margaritelli - S.P.A. Installation de séchage artificiel du bois à cellule d'air chaud, pourvue d'un déflecteur lamellaire mobile pour interruption des courants internes d'air
EP0633996A1 (fr) * 1992-04-10 1995-01-18 DINH, Khanh Procede et secheur de sechage a boucle fermee
EP0633996A4 (fr) * 1992-04-10 1995-05-31 Khanh Dinh Procede et systeme de sechage a boucle fermee.
EP0775882A1 (fr) * 1995-11-21 1997-05-28 Hermann Waldner GmbH & Co. Sécheur, notamment pour l'industrie chimique ou pharmaceutique
WO1998019124A1 (fr) * 1996-10-28 1998-05-07 Hellmann-Hygrex Luft- Und Klimatechnik Gmbh Procede et dispositif pour secher des couches minces
FR2781180A1 (fr) * 1998-07-17 2000-01-21 Fours Et Bruleurs Rey Reacteur de retification du bois
WO2000004328A1 (fr) * 1998-07-17 2000-01-27 Fours Et Bruleurs Rey Reacteur de retification du bois
WO2001031270A2 (fr) * 1999-10-27 2001-05-03 Skrotskaya Olga Panteleimonovn Installation de sechage et procede de sechage de bois
WO2001031270A3 (fr) * 1999-10-27 2001-06-14 Skrotskaya Olga Panteleimonovn Installation de sechage et procede de sechage de bois
US6725566B1 (en) 1999-10-27 2004-04-27 Viktor Georgievich Skrotsky Drying plant and method for drying wood
WO2006006837A1 (fr) * 2004-07-15 2006-01-19 Gordijs, Jevgenijs Procede de sechage de materiaux scies et sechoir conçu a cet effet
DE102005017187A1 (de) * 2005-04-13 2006-10-19 Lindauer Dornier Gmbh Durchlauftrockner in Mehretagenbauweise, insbesondere für plattenförmige Produkte
DE102005017187B4 (de) * 2005-04-13 2007-06-21 Lindauer Dornier Gmbh Durchlauftrockner in Mehretagenbauweise, insbesondere für plattenförmige Produkte
AT503635B1 (de) * 2006-05-10 2008-10-15 Wienerberger Ag Kammertrockner
US9948549B2 (en) 2006-11-02 2018-04-17 Voip-Pal.Com, Inc. Producing routing messages for voice over IP communications
EP1923649A3 (fr) * 2006-11-20 2009-10-28 Alfons Tschritter GmbH Procédé pour le séchage d'une matière à sécher ainsi qu'une installation pour la mise en oeuvre du procédé
RU2468319C2 (ru) * 2008-03-03 2012-11-27 Василий Андреевич Столяр Способ сушки древесины и установка для его осуществления
CN103673526A (zh) * 2013-04-18 2014-03-26 成都天磐科技有限责任公司 基于对材料进行烤干的装置

Also Published As

Publication number Publication date
DE3637737A1 (de) 1988-05-19
EP0266516A3 (fr) 1989-03-29
JPS63123979A (ja) 1988-05-27
DE3637737C2 (fr) 1988-08-25
US4837945A (en) 1989-06-13

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