EP0293426B1 - Anlage und verfahren zur trockenen mahlvorbereitung von kornartigen nahrungs- und futtermitteln - Google Patents

Anlage und verfahren zur trockenen mahlvorbereitung von kornartigen nahrungs- und futtermitteln Download PDF

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Publication number
EP0293426B1
EP0293426B1 EP87907955A EP87907955A EP0293426B1 EP 0293426 B1 EP0293426 B1 EP 0293426B1 EP 87907955 A EP87907955 A EP 87907955A EP 87907955 A EP87907955 A EP 87907955A EP 0293426 B1 EP0293426 B1 EP 0293426B1
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EP
European Patent Office
Prior art keywords
size
classifying
air
gravitational
classification
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
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EP87907955A
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German (de)
English (en)
French (fr)
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EP0293426A1 (de
Inventor
Roman Mueller
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Buehler AG
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Buehler AG
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Priority to AT87907955T priority Critical patent/ATE65194T1/de
Publication of EP0293426A1 publication Critical patent/EP0293426A1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
    • B07B13/14—Details or accessories
    • B07B13/16—Feed or discharge arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
    • B07B4/08—Separating solids from solids by subjecting their mixture to gas currents while the mixtures are supported by sieves, screens, or like mechanical elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B2201/00—Details applicable to machines for screening using sieves or gratings
    • B07B2201/04—Multiple deck screening devices comprising one or more superimposed screens

Definitions

  • the invention relates to a system for dry grinding preparation of grain-like food and feed, such as cereals, namely for cleaning, separating into different fractions and preferably for reading foreign material, such as sand, stones, scrolls, etc., which a size classification unit, for.
  • a size classification unit for.
  • sieves as well as a gravity classifying unit performing a throwing swing movement, e.g.
  • a stone reader for example, as a stone reader, light grain reader, etc.
  • the currently built mill systems mostly have four building complexes side by side, a first one for the silo, a second one for the grinding preparation, a third one for the grinding or mill and a fourth one for the finished products.
  • the preparation and grinding machines are distributed over four or five floors.
  • the storage silos usually tower above the mill building.
  • the most natural thing about the storage silos namely the discharge through openings in the floor with the corresponding downward movement of the product by gravity, has also been used in the machines for dry grinding preparation for many decades.
  • the product is fed into the machines on the top floor, only to be moved by gravity, i.e. to move downwards from floor to floor or from machine to machine without the technical use of additional energy for transport.
  • a fundamental disadvantage of dry grinding preparation results from the floor-to-floor connection of the grinding preparation machines.
  • the entire product or material flow in the respective machine is brought into a flat thin layer or a thin falling veil.
  • the product stream is then bundled again in order to then be spread over the area again after the transfer.
  • a specially designed inlet section is required for the uniform flat formation of a product bed. This is to prevent the initial part of the machine from being poorly used for the work it desires, based on the area.
  • FR-A-711 465 (MEUNIER) describes a coal separation process for separation into different coal fractions. With this separation process, the product flow is guided by means of vibration and air forces over a sieving and then a weight classification, without constriction of the product flow up to the point of exit from the weight classification.
  • the air is conducted in recirculation mode as follows: through the weight classification, the room above the weight classification and the room above the sieve, a subsequent common exhaust pipe, a fan, a dust separator and finally back to the weight classification.
  • CH-A-96 318 discloses an installation and a method for the dry grinding preparation of granular food and feed with several size classifying units, namely sieves, which are subjected to a common vibration.
  • the screens are arranged one above the other and form a fork or. V-shaped rooms.
  • the product flow is transferred from one screen to the other at some transfer points between two screens in the manner of a falling product carpet or veil.
  • an air stream blows through the lower end of the one sieve and removes the light bodies according to the principle of wind separation.
  • the invention is concerned with the problem of improving the dry grinding preparation, preferably in such a way that it is possible to concentrate the work processes, but preferably while maintaining the manageability of each step, the possibility of influencing each step, particularly preferably achieving an at least the same Throughput and quality of work as before.
  • the solution according to the invention is characterized in that the size classification unit and the weight classification unit form an oscillating group in the grinding preparation system mentioned at the outset, and are arranged one above the other in the form of a fork or V, so that a fork or respectively between the underside of one and the top of the other unit. V-shaped space is created; Means for transferring the product flow in the manner of a product carpet or veil falling from the size classification unit at the fork position to the heavy classification unit underneath and finally means for generating an air flow through the fork or V-shaped space, but not provided by the size classification unit.
  • the invention thus enables an impressive solution to the problem mentioned with the simplest measures and, in addition, even better use of the work surfaces.
  • a separate vibratory drive can be provided for the size classification unit and for the weight classification unit.
  • the vibration group formed by the size and weight classification unit preferably has a common vibration drive, so that an identical vibration (identical direction, frequency and amplitude) is impressed on both units.
  • the vibratory drive is arranged on both sides of the vibrating group with an angle of incidence to a horizontal plane of gravity, such that a throwing vibration for upward conveyance is generated for the weight classification, while a throwing vibration for downward conveyance is generated for the size classification. All work surfaces therefore perform an optimal swinging movement.
  • the means for generating the air flow have a bottom that closes the size classification unit (sieve device), a suction fan preferably being connected to the expanded side of the aspiration space between the size classification unit and the weight classification unit.
  • the aspiration space expanded on one side is very particularly preferably divided into at least two extraction chambers, namely an upper and lower extraction chamber, with adjustable air throttles being assigned to each extraction chamber.
  • the invention allows the aspiration space, which widens to one side, to be provided with an air suction system which, via a dust separator, leads the air back to the suction side of the stone reader in recirculation mode.
  • the invention thus enables the plant for dry grinding preparation, which previously consisted of several individual machines, in which each individual machine A good aspiration for the intensive ventilation and the whole system needs a central air filter system to build now as a closed, compact machine.
  • the new invention allows all work steps to be operated in one unit, in many cases without a filter, with circulating air.
  • the weight classification unit very particularly preferably consists of two classification tables arranged one above the other and through which the same air flows. It is possible that the upper classification table as a concentrator. Light grain reader or as a stone reader and the lower classification table is designed as a stone reading table. Furthermore, it is also possible to form the size classification unit from two identical sieve tables arranged one above the other (two parallel runs) or to use two or more different sieve tables one above the other. Furthermore, the classification tables are preferably arranged parallel to one another in the same classification unit.
  • the invention further comprises a method for the dry grinding preparation of a product stream from grain-like foods and feedstuffs, such as cereals, namely for cleaning, separating in different fractions and, preferably for reading out foreign material, such as sand, stones, rolls, etc., the product stream being oscillated - resp.
  • Air forces are promoted via at least one size classification (screening) and then at least one gravity classification (stone reading, light grain reading) that causes a swinging movement.
  • a method is known from GB-A-2 040 190 (GEBRÜDER BÜHLER) already mentioned.
  • the known method is further developed in such a way that the product flow in the size classification and in the weight classification of a common one Vibration is subjected, the flow and the inclination direction in the size classification opposite to the flow and inclination direction in the severity classification is selected and the product flow without entering the size classification.
  • Constriction (spread out like a carpet) up to the exit of the respectively read fraction from the respective classification unit, at the latest from the weight classification unit.
  • FIG. 1 The entire system consists of a compact machine 1 which contains a screening device 2 as a size classification unit and a concentrator 3 and a stone reader 4 as a weight classification unit.
  • An arrow 5 symbolizes a vibration exciter.
  • Whose direction of oscillation is angularly aligned with the sieving device 2 as well as with the concentrator 3 and the stone reader 4 in accordance with the setting angle ⁇ to the horizontal plane of gravity 6.
  • the direction of vibration is simultaneously parallel to the drawing plane of FIG. 1 or parallel to the main product flow direction.
  • the machine 1 is supported on vibration bearings 7 via a frame 8 on the floor 9.
  • a product feed line 10 is attached above the sieve device 2 and is firmly connected to the non-vibrating ceiling 12 via a suspension 11. Between the product feed line 10 and the screening device 2 is a flexible Cuff 13 attached, which serves as a transition from the non-vibrating parts of the machine 1 to the vibrating parts.
  • the area of product entry into the screen box 2 is designed as a distribution box 14, so that the product stream bundled in the tube in the product feed line 10 is spread out as a fluffy, uniform product carpet on the top screen layer or the coarse screen 15.
  • the coarse sieve 15 is preferably used to remove coarse additives and disruptive, large foreign bodies, such as cords, pieces of wood, etc., which are removed from the product stream via an outlet 16.
  • the space above the coarse screen 15 is completely closed off from the outside by sheet metal cladding 17, so that no dust escapes and no air exchange takes place to the outside.
  • a selection sieve 18 This has a relatively fine sieve mesh in order to obtain fine constituents such as fine sand, grain fragments etc. as sieve diarrhea.
  • the sieve diarrhea is carried away via a closed, essentially air-impermeable bottom 19 and an adjoining sand outlet 20, that is to say it is separated from the product stream.
  • the rejection of the sieve 18 flows directly across the entire width of the table through a discharge channel 21 and continues to be distributed evenly over the entire width onto the concentrator 3 through which there is a large amount of air. Fluid bed on the concentrator 3 has a double function.
  • the product parts are loosened, for example dirt that is only slightly adhering to a grain or shell parts, which facilitates the subsequent division into fractions.
  • the main forces in the fluidized bed are the air forces. Accordingly, a very stressed stratification takes place within the fluidized bed according to the severity. Cereal grains move within a fluidized bed upwards, stones down, provided similar sizes.
  • the fork-like (or V-shaped) arrangement of sieve device 2 and concentrator 3 creates an expanding space 22, which is connected to an aspiration line 24 via a suction nozzle 23.
  • the desired amount of air for the operation of the machine 1 can be set by an adjusting flap 25.
  • the expanding space 22 is divided into sections 22 ', 22 ⁇ by at least one wall 26. This allows throttle valves 27 and 28 in one or the other sector 22 'or 22 ⁇ depending on need (either in the upper or lower part of the fluidized bed) to set more or less large air flows.
  • a flexible sleeve 29 is in turn attached between the suction nozzle 23 and the aspiration line 24.
  • the concentrator 3 has the task of layering the product stream and concentrating the specifically heavy parts in the area immediately above its table surface. Just before the bottom end of the concentrator table surface, which is air-permeable up to this point, but is impermeable to the product, there is a section 30 with large product outlet openings. Through this section, the lower layer, enriched with the heavy parts, in particular with stones, is drained directly onto a chute 31 extending underneath and from there to a central region of the stone reader 4. With an adjustable product storage bar 32, the percentage portions of the product flow - portion of the gravity concentrate on stone reader 4 and portion of the light fraction - can be determined according to the particular task. The fraction of the light fraction is fed directly to a corresponding outlet 33. There is also the possibility of adding a medium-weight fraction via the additional diarrhea openings symbolized by the arrow 34 at the very bottom of the concentrator 3 into an outlet 35 for the heavy goods, ie for the good, heavy grains.
  • the stone reader 4 has a rough surface, usually a mesh.
  • the heaviest parts lying directly on the table surface of the stone reader 4 are conveyed to the upper left end of the table by the rough table surface and the throwing vibrations of the vibration exciter and then fed to a stone outlet 36.
  • the concentrator 3 has a table with a smooth surface (sheet with fine perforations), so that the concentrator table surface exerts a conveying effect only on the heavy product layer closest to the table surface, despite its oscillation identical to the stone reader 4. Due to the fluid bed effect, the product flows downward like a liquid.
  • the one Concentrator 3 and the stone reader 4 common direction of vibration is also correct for the screening device 2.
  • the product is conveyed downwards by the vibration of the sieve table surface.
  • All three machine parts 2, 3 and 4 are arranged directly one above the other according to the invention.
  • the entire machine 1 is only about man-high, so it can be installed in any room of normal height.
  • the experts involved rate the surprisingly successful interplay between the screening device 2 and the concentrator unit 3 as being particularly advantageous.
  • the embodiment of the machine 1 shown in FIG. 1 can also be used in combination with a vertical aspiration channel 40.
  • the wall 26 is preferably made adjustable, so that both the air quantity distribution on the concentrator surface within certain limits, but in particular the air required in the aspiration channel 40, are adjusted separately by means of a throttle 41 can.
  • the amount of air that is extracted from the higher part of the room 22 can be adjusted by a control flap 42.
  • the bottom of the stone reader 4 is permeable to air, so that the air can freely flow in and through the stone reading table from below.
  • Both solutions work in the so-called suction mode, which is also a very big advantage for easy control of the air flows.
  • the solution of FIG. 3 has the structural elements of the solution according to FIG. 2, but is further developed in a basic function. It enables the machine 1 to be operated entirely with circulating air and has a light-weight separator for this purpose.
  • the exhaust air from the aspiration channel 40 is passed directly into a rotary cutter 50.
  • dust and shell parts are separated from the air with a very high degree of separation and can be discharged via a dust lock 51.
  • the working air is returned to the classifying section through a duct 52 and a return line 53.
  • the air distribution box 54 is part of the vibrating unit and is connected to the return line 53 via a flexible sleeve 55.
  • the stone reader is constructed in the sandwich construction known per se, which at the bottom has a plate 56 with very fine perforations, so that there is a guarantee of good air distribution on the table surface of the stone reader 4.
  • the machine can also be assigned a small filter (not shown) behind an extraction nozzle 61.
  • a fan 58 which is preferably arranged after the rotary cutter 50, the desired pressure distribution in the system can be regulated via corresponding air flaps 59 and 60, as indicated by the + and _ signs in circles as symbolic pressure values.
  • the rotary cutter 50 can nevertheless be used, and the exhaust air can be sucked off, for example, via an aspiration system (not shown) via the suction nozzle 61.
  • two stone selection table surfaces 72, 73 are provided, each of which has a good support in the form of a mesh.
  • the swinging movement gives that directly on the upper resp. lower table surface 72, 73 heavy goods lying on top have a strong conveying effect after the higher table end.
  • the light material is lifted by the strong, evenly distributed air flow from the two table surfaces, swims in the direction of the lower table ends and is via the spouts 33 and. 35 carried out.
  • the actual stone secretion takes place only between the lower table surface 73 and a guide plate 77 provided above the upper end of this table. Because of the air flow in this area which runs counter to the movement of material, the stones are transferred here with only a small fraction of grain and are finally discharged through the rubber hose lock 36.
  • a particularly great advantage of the embodiment variant according to FIG. 4 is that the throughput through the different process zones can be adapted very precisely to the specific requirements of the individual machine parts. Since all tables have an approximately equal working area, the sieve area is doubled and the actual stone reading area doubled, as the bottom one Table area only receives a subset of the total. This allows a very high screening and stone selection quality with high product throughput.
  • the lowest table surface is used for stone selection.
  • An overlying table 81 has a slightly less rough table surface, so that some of the stones can be conveyed upwards with a small amount of grain and fall directly onto the stone reading table 4 via a passage opening 80.
  • the upper table 81 of the weight classification serves primarily as a shift table and has a "good swamp" 82 in the lower part, i.e. a trough-shaped depression, in which all the heavy goods (heavy grains) collect together with the stones.
  • the gravity fraction from the material swamp 82 is drained through the bottom openings 30 and fed to the stone reading table 4 via the chute 31.
  • the great advantage of this variant lies in addition to the very high stone selection quality, also in a very good separation, e.g. For example, in a heavy grain that is discharged through the outlet 35 and in a light cereal that is discharged through the outlet 33.
  • the invention encompasses both a method and a machine (1) for the dry cleaning of grain-type foods and animal feed, such as cereals.
  • the material to be cleaned is separated into the different fractions in a single vibration group.
  • This has an upper size classification (2), which can consist of any sieve combination (15, 18; 70, 71), preferably has a closed lower floor and directly above a weight classification (3, 4; 72, 73; 81) is arranged, in such a way that the two classification units to each other fork or. Are arranged in a V-shape.
  • the weight classification (3, 4; 72, 73; 81) can also be combined in different versions, for example as a single or double-layer table, as an upper layer and lower stone reading table.
  • the fork-shaped space (22) is used to guide the air for the heavy class tables.
  • An important idea lies in the fact that the goods to be cleaned are passed from the entry into the machine 1 to the exit without interruption across the area, in the manner of a spread textile web and transferred from machine part to machine part (classifying unit to classifying unit).
  • a single compact machine without bundling of goods is provided.

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  • Mechanical Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Disintegrating Or Milling (AREA)
  • Fodder In General (AREA)
  • Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)
  • Coloring Foods And Improving Nutritive Qualities (AREA)
  • Medicines Containing Plant Substances (AREA)
  • Adjustment And Processing Of Grains (AREA)
  • Drying Of Solid Materials (AREA)
  • Cleaning In General (AREA)
  • Fertilizers (AREA)
  • Threshing Machine Elements (AREA)
EP87907955A 1986-12-01 1987-12-01 Anlage und verfahren zur trockenen mahlvorbereitung von kornartigen nahrungs- und futtermitteln Expired - Lifetime EP0293426B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87907955T ATE65194T1 (de) 1986-12-01 1987-12-01 Anlage und verfahren zur trockenen mahlvorbereitung von kornartigen nahrungs- und futtermitteln.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4780/86A CH672440A5 (da) 1986-12-01 1986-12-01
CH4780/86 1986-12-01

Publications (2)

Publication Number Publication Date
EP0293426A1 EP0293426A1 (de) 1988-12-07
EP0293426B1 true EP0293426B1 (de) 1991-07-17

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Application Number Title Priority Date Filing Date
EP87907955A Expired - Lifetime EP0293426B1 (de) 1986-12-01 1987-12-01 Anlage und verfahren zur trockenen mahlvorbereitung von kornartigen nahrungs- und futtermitteln

Country Status (14)

Country Link
US (1) US4971684A (da)
EP (1) EP0293426B1 (da)
JP (1) JPH0651176B2 (da)
KR (1) KR930008288B1 (da)
CN (1) CN1009620B (da)
AT (1) ATE65194T1 (da)
AU (1) AU8330687A (da)
CH (1) CH672440A5 (da)
DE (1) DE3771495D1 (da)
ES (1) ES2008362A6 (da)
PL (1) PL156517B1 (da)
SU (1) SU1641185A3 (da)
UA (1) UA6002A1 (da)
WO (1) WO1988004204A1 (da)

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US8436268B1 (en) 2002-08-12 2013-05-07 Ecullet Method of and apparatus for type and color sorting of cullet
DE102004054275A1 (de) * 2004-11-09 2006-05-11 Bühler AG Vorrichtung zum Trennen von körnigem Gut
DE102005019998A1 (de) * 2005-04-27 2006-11-02 Bühler AG Verfahren und Einrichtung zur Reinigung von Getreide
JP4686309B2 (ja) * 2005-09-05 2011-05-25 古河機械金属株式会社 分粒分級装置
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CN106179969A (zh) * 2016-07-19 2016-12-07 辽宁科技大学 一种电动垂直摆振式谷物分级装置
CN107890999A (zh) * 2017-10-23 2018-04-10 江苏脒诺甫纳米材料有限公司 风选分离装置
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US1548536A (en) * 1925-08-04 Comcent-batob
FR330047A (fr) * 1903-03-07 1903-08-11 Meguerdisch Stepanovitsch Lomo Procédé et appareil pour nettoyer les semoules
US984866A (en) * 1909-05-06 1911-02-21 Earl H Tate Aero ore-concentrator and placer-machine.
CH96318A (fr) * 1921-06-01 1922-10-02 Wiedmer Hans Machine pour nettoyer et trier les graines.
US1667331A (en) * 1927-09-27 1928-04-24 O'toole Edward Cleaning and sizing apparatus
FR711465A (fr) * 1930-05-22 1931-09-10 Appareil pour la séparation pneumatique de matières composées d'éléments de différentes densités
US2040196A (en) * 1933-06-22 1936-05-12 Berrisford William Henry Apparatus for separating sized mixtures of material
US2358293A (en) * 1940-06-20 1944-09-12 Adamson Stephens Mfg Co Coal cleaner
US2332183A (en) * 1941-08-23 1943-10-19 Stump Earl Apparatus for process for separating finely divided intermixed materials
US2449007A (en) * 1944-11-02 1948-09-07 Huntley Mfg Company Method and apparatus for separating peanuts from debris
CH270243A (de) * 1948-04-21 1950-08-31 Buehler Ag Geb Griess- und Dunstputzmaschine.
FR1099906A (fr) * 1949-07-29 1955-09-14 Kalker Trieurfabrik Fabr Tarare
US2722312A (en) * 1950-03-18 1955-11-01 Sutton Steele And Steele Farmer's stock peanut pre-cleaner
CH641976A5 (de) * 1979-01-19 1984-03-30 Buehler Ag Geb Vorrichtung zur trockenen reinigung von getreide.
DE3561131D1 (en) * 1984-05-08 1988-01-21 Buehler Ag Geb Device and method for separating granular goods

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4326836C2 (de) * 1993-08-10 2002-06-20 Buehler Ag Verfahren und Vorrichtung zur Mahlvorbereitung von Getreide
DE4345422C2 (de) * 1993-08-10 2002-09-12 Buehler Ag Verfahren und Vorrichtung zum Scheuern von Getreide
CN104554831A (zh) * 2014-12-16 2015-04-29 何建慧 一种谷物进仓自动流水线

Also Published As

Publication number Publication date
AU8330687A (en) 1988-06-30
KR890700408A (ko) 1989-04-24
ES2008362A6 (es) 1989-07-16
JPH0651176B2 (ja) 1994-07-06
US4971684A (en) 1990-11-20
JPH01501531A (ja) 1989-06-01
WO1988004204A1 (en) 1988-06-16
SU1641185A3 (ru) 1991-04-07
ATE65194T1 (de) 1991-08-15
DE3771495D1 (de) 1991-08-22
CN87101243A (zh) 1988-06-22
KR930008288B1 (ko) 1993-08-27
EP0293426A1 (de) 1988-12-07
PL156517B1 (pl) 1992-03-31
UA6002A1 (uk) 1994-12-29
CH672440A5 (da) 1989-11-30
CN1009620B (zh) 1990-09-19
PL269157A1 (en) 1988-09-01

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