EP0311831A1 - Régulation des étapes d'ouverture de fibres d'une installation de préparation à la filature - Google Patents

Régulation des étapes d'ouverture de fibres d'une installation de préparation à la filature Download PDF

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Publication number
EP0311831A1
EP0311831A1 EP88115802A EP88115802A EP0311831A1 EP 0311831 A1 EP0311831 A1 EP 0311831A1 EP 88115802 A EP88115802 A EP 88115802A EP 88115802 A EP88115802 A EP 88115802A EP 0311831 A1 EP0311831 A1 EP 0311831A1
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EP
European Patent Office
Prior art keywords
stage
running
production
ratio
control
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Granted
Application number
EP88115802A
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German (de)
English (en)
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EP0311831B1 (fr
Inventor
Walter Schlepfer
Christof Staeheli
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Maschinenfabrik Rieter AG
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Maschinenfabrik Rieter AG
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Application filed by Maschinenfabrik Rieter AG filed Critical Maschinenfabrik Rieter AG
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G21/00—Combinations of machines, apparatus, or processes, e.g. for continuous processing

Definitions

  • This invention relates to a control for processing stages in a fiber processing plant.
  • the plant is part of a spinning mill for the production of staple fiber yarns, but the invention is not limited to this application.
  • bale removal unit runs in the so-called stop / go mode and the removal depth or the driving speed speed of the unit is controllable in order to maintain an "optimal" ratio of running time / lactation as continuously as possible. Switching the bale removal on and off is carried out on the basis of control signals which are obtained from the next processing stage.
  • control signals for bale removal from a processing stage at the end of the blowroom line (e.g. from the card) (DOS 3513295).
  • the control signals are used to control the driving speed of the removal unit. If a discontinuous (stop / go) operating mode is provided, the runtime / lactation ratio should also be “optimized” here (col. 3, lines 31 to 38 of the DOS).
  • the present invention cannot completely rule out changes in fiber processing, but can significantly reduce them, and is in any case designed in such a way that changes in fiber processing are normally only required within narrowly defined limits.
  • the invention provides a fiber processing installation which consists of a plurality of fiber processing stages, fibers to be processed being conveyed in sequence from stage to stage and at least one stage running in stop / go mode, while a stage downstream of it is a predetermined product (e.g. a sliver) continuously delivers.
  • a predetermined product e.g. a sliver
  • the "levels" are defined according to the technology and not according to the machines.
  • a "stage” can therefore include a plurality of individual machines. For example, a carding stage could comprise between 6 and 20 individual machines.
  • the delivered product (or the output) of a stage then comprises the production of all machines currently running in this stage.
  • the invention also provides for the determination of a target value for the ratio of runtime / lactation in said (upstream) stage, which is to run in stop / go mode.
  • Monitoring means are also available to monitor the actual runtime / lactation ratio of this stage and to compare it with the predefined setpoint. In the event of a deviation of the actual ratio from the target ratio, the production of this stage, which remains constant during normal operation during the running time, can either be increased or decreased in order to adjust the actual ratio mentioned to the target ratio.
  • the present invention is characterized in that the setpoint is not fixed (as suggested in EU-PS 93235), but can be changed as a function of the production of the downstream stage (which is continuously producing in normal operation).
  • the system can be designed in such a way that a change in the output of the output stage is immediately reflected in a corresponding change in the target ratio of runtime / lactation in each upstream, discontinuous stage, the "corresponding change" being able to be determined individually for each upstream stage.
  • the named function can be determined so that the target ratio takes a theoretically optimal value (e.g. 90:10 - see EU-PS 93235) with full production of the downstream stage.
  • the target ratio can then be reduced linearly depending on the reduction in the production of the downstream stage.
  • the optimal adjustment function for a particular plant can be determined empirically and entered into the system, and where adjustment to multiple levels occurs, the adjustment function can vary from level to level.
  • the monitoring of the actual runtime / lactation ratio can be carried out according to the principles described in EU-PS 93235, and in the case of bale removal as an upstream stage, the production can also be changed as described in this European patent specification, i.e. by changing the removal depth or the driving speed of the removal unit.
  • the invention can thus be easily integrated into existing systems, in which feedback circuits are provided between stages in order to regulate the ratio of the running time / idle time of the upstream stage according to predetermined states in the downstream stage (e.g. filling level in a memory).
  • the system is preferably controlled by a computer which monitors the production of the downstream stage and determines the target ratio for the upstream stage (s) accordingly. Control loops between upstream stages can also be implemented via the computer.
  • Fig. 1 This comprises a feed machine S, a fan v, a feed channel K, two cards C1 and C2, each with a filling shaft (not indicated), a microprocessor control ⁇ p and a controllable drive A for the feed machine S.
  • a measuring device M is in the channel K between the Fan V and the first card C1 installed to measure the static pressure. It delivers an output signal to the microprocessor ⁇ p.
  • Each card C1 or C2 delivers a signal to the microprocessor ⁇ P to show whether this card is currently in operation or not.
  • the microprocessor control ⁇ P supplies a control signal to the drive A of the food processor S.
  • the fan drive not shown, cannot be controlled by the control ⁇ P. In operation, it runs at a constant speed n.
  • the control system should work together with the other elements in such a way that the filling chute of each card being produced remains “full” (within certain tolerances).
  • the static pressure in the channel K at the measuring device M can represent the filling conditions. If the measured static pressure is outside a range determined by the processor ⁇ P, the supply is switched on (when the pressure drops) or switched off (when the pressure rises). The supply therefore runs in the so-called stop / go operating mode.
  • the control uP only switches the feed drive A on and off, in this example it has no influence on the speed of the drive, ie on the current production of the feed machine.
  • This current production is predetermined for normal operation and kept constant, so that a constant quality (processing of the fibers) is achieved.
  • the set production must be sufficient for the greatest possible "demand” from the connected cards. Normally a certain “overproduction” is set, so that when all connected cards produce as quickly as possible, there is an efficient relationship between the idle time and the running time of the food processor in stop / go mode, eg 90% running time to 10% standing time.
  • the control method described is not restricted to a simple system with only two cards.
  • the current production of the dining machine S can be fixed or set during the assembly of the system.
  • the number of cards allocated to a food machine can be reduced, e.g. by actuating a release agent T (Fig. 1), a fixed production of the food machine S is not useful.
  • the production should be adjusted to the number of cards allocated to the food machine, in order to enable an optimal ratio of runtime to breastfeeding for each given allocation.
  • the line contains a separating means T, as indicated by dashed lines in FIG. 4, this separating means can also be connected to the control ⁇ P by a signal line, so that the control is informed of the currently "effective structure" of the line.
  • the separating agent T blocks the feed channel K between card C2 and a third card C3. If this release agent T is made ineffective, the card C3 can also be fed from the feed machine S via the channel F flakes.
  • the average production of the feed machine must correspond to the total production of the cards allocated to this feed machine.
  • the average production of the food machine depends on (a function of) the current production set and the ratio of running time / lactation.
  • the cards run "continuously", the overall production of the card is subject to fluctuations, e.g. can be provisionally turned off for any reason.
  • the ratio of the running time / lactation of the feed machine S is to be monitored, as was already proposed in the EU PS 93235 for bale removal. Since the processor ⁇ P switches the drive A on and off, the processor can easily determine the running time (or downtime) of the food processor over a predetermined time interval, which equates (or enables) the determination of the ratio of running time / downtime for these intervals light, if it is desired to calculate the ratio yourself). This actual ratio is then compared with a target ratio and any deviations are determined. The current production of the feed machine is then adjusted (for example by changing the speed of the feed roller during its running time) in order to counter the deviation.
  • the target ratio is not fixed (as in EU 93235), but is calculated by the processor depending on the number of producing cards. Possibilities for such a determination will be described below in connection with FIGS. 3 to 5. For the time being, the principle is briefly summarized using the diagram in FIG. 2.
  • the box Z represents the final stage (carding machine) of the line which is supplied by the upstream stage X, so that a material flow Y (from X to Z) takes place. This material flow is switched on and off depending on consumption via the feedback R.
  • the ratio runtime / lactation of stage X is determined and delivered as a signal via line L to a comparison means VM.
  • a determining measure of the consumption is converted in stage Z into a signal representing a target ratio and delivered via line 1 to the comparison means VM.
  • stage X evaluates the signal e so that a change in the current production of this stage takes place.
  • the necessary change will be small (fine adjustment), because the level Z will be corresponding at this time less material is required via the feedback R - the invention facilitates the adaptation of stage X to the behavior of stage Z.
  • the adaptation can thus be carried out relatively quickly, since the system is no longer dependent on "leveling off” on an uncontrolled runtime / lactation ratio . But it is also no longer tied to a "rigid"("optimized") ratio (as suggested in EU PS 93235), which means relatively large changes in fiber processing (with corresponding fluctuations in the quality of the end product).
  • the invention can also be used to control other upstream stages, as will now be explained in connection with the other figures.
  • the system shown schematically in Fig. 3 comprises 6 "stages" I to VI.
  • This system corresponds to the fiber processing line of the short-staple spinning mill that is common today, from bale removal (level I) to carding (VI).
  • the material (fibers or flakes) is conveyed pneumatically between the different stages, which is indicated by schematic pipelines (double arrows) in FIG. 3.
  • Level I can include a single "Unifloc” (Registered Trade Mark) machine and Level II can include a “single roller cleaner” machine.
  • Level III can be a single "Unimix” (Registered Trade Mark) and stage IV include a fine opener of the type “unit cleaning machine” (EW).
  • EW unit cleaning machine
  • Stage V comprises an ERM machine, together with a transport fan, not shown, to form a flake feed unit.
  • the latter is used to feed flakes to a plurality of cards K, which together form stage VI, each card K being equipped with its own feed chute and the feed chutes being connected to a common feed duct extending from the stage V transport fan.
  • each card K runs continuously and delivers a continuous sliver (not shown).
  • the customers of the cards are connected via a line 10 (FIG. 2) to a master computer LR, so that the computer is informed whether each card is currently in operation or not.
  • a master computer LR monitoring the operating state of each individual card.
  • a pressure sensor 14 reacts to the static pressure in the feed channel and delivers a corresponding signal via line 12 to the computer LR.
  • the computer sends a corresponding signal to the flake feed unit FS in order to switch the flake feed on or off.
  • the supply unit is therefore connected to the computer LR by a line 16.
  • the flake feed unit also has a filling shaft, which material from the ERM machine in stage IV receives.
  • a level monitor (not shown) installed in this shaft is connected to the computer by a line 18 so that the latter can switch the delivery from the ERM machine on or off via line 20.
  • a similar level monitoring (not shown) of the ERM machine gives a signal via line 22 to the computer for controlling the delivery of the mixing machine UM via line 24.
  • the storage box of the mixing machine UM is also equipped with a level monitor (not shown) which emits a signal via line 26 to the computer LR. Accordingly, the computer sends signals via a line 28 to the traction motor (not shown) of the bale removal unit in order to switch the bale removal on or off.
  • stages I, III, IV and V run discontinuously (in stop / go mode) and that each of these upstream stages is connected to a downstream stage by a feedback circuit.
  • this control loop consists of the material flow MF itself, the level monitoring NU of the downstream stage, the signal connection with the host computer LR, the drive motor AM, the upstream stage and the signal connection between the computer and the drive motor.
  • Such control loops are of course well-known prior art.
  • the ratio runtime / lactation of at least one upstream stage, preferably stage I is to be monitored by the host computer LR and compared with a target value.
  • a signal from the drive motor AM (FIG. 5a) is sent to the computer via the line 30 and there with a clock signal from a clock generator TG is subjected to an AND operation (indicated schematically by an AND gate), and the resultant result Signal is delivered to a counter Z.
  • the latter also receives the clock signal from the clock generator TG and uses the latter signal to define predetermined time periods T (FIG. 5B) of the same length.
  • the counter Z either sums up the time intervals t during which the drive motor AM is running or the smaller, intermediate pauses. From these values, the counter Z calculates an average value for the actual runtime / lactation ratio of the corresponding upstream stage.
  • the output signal of the counter Z which represents the actual ratio is supplied to a comparison device G and is compared there with a signal which represents a setpoint value.
  • a signal representing any deviations is converted by the computer LR into a corresponding control signal in order to change the effective production of the upstream machine accordingly.
  • the computer LR thereby controls the production of stage I (bale removal machine)
  • the desired production change can be carried out via one, the other or both of two setting options, namely by setting the removal depth or setting the driving speed of the unit.
  • Corresponding signals can be sent via line 28 (driving speed) to the drive motor of the overall unit and / or via line 328 to a height adjustment device (not shown) for the bale removal member of the unit (see EU-PS 93235 and US-PS 4,660,257) can be supplied.
  • the signal representing the setpoint value which is supplied to the device G, must be generated by the master computer LR as a function of signals received via the line 10.
  • the setpoint is selected step by step depending on the number of cards currently running, it is not necessarily the absolute number that is important, but only the proportion of running cards compared to the maximum number. For example, if all cards are running, the setpoint for the runtime / downtime ratio of the bale removal machine can be set to 90:10. If only two thirds of the cards are running, the target ratio for the bale removal machine can be reduced to 60:40 - a linear adjustment of the ratio to the reduced number of running cards.
  • Each intermediate stage can also be monitored individually by the master computer LR.
  • FIG. 5b Possible changes are shown schematically in FIG. 5b.
  • the bale removal machine runs within a period T over five intervals t, which are drawn with full lines (such a regular run is of course highly unlikely in practice, but only serves Explanation of the principle). If the production of one or more cards fails, the duration of each inter valls are reduced in the given time period T ( ⁇ ), which was indicated by dashed, vertical lines.
  • the maximum production of the upstream stage must be increased (constantly over each time interval), in order to do so to comply with the newly set target ratio for the running time / lactation.
  • Such an increase is indicated by i between the first and second time period in FIG. 5b, the duration ⁇ of each interval in the second time period corresponding to the duration of the reduced intervals ⁇ (indicated by dashed lines) of the first time period.
  • the production of the first continuously running stage determines the target value for the ratio of running time to lactation of at least one and preferably all upstream, discontinuously running stages. However, these are not necessarily all upstream stages.
  • the mono-roller cleaner (stage II in Fig. 3) runs continuously, although the two stages I and III run discontinuously. In this case, stage II plays no role in the "rule chain", which it simply skips by connecting the storage box - computer - bale opener.
  • the invention is not restricted to the use of a production signal from the card to control the upstream machines.
  • the production signal should be continuously available and should represent a reliable measure of the actual production of the line.
  • the first stage of the line that can meet these conditions is preferably chosen as the determining stage for the control of the upstream machines. In short-staple spinning, the conditions mentioned can usually only be met in the carding machine.
  • each individual card will be the same. To determine the current production of the card, it is then sufficient to tell the computer whether each individual card is running or not. If the production values for the individual cards are set individually, the computer must not only be informed whether a specific card is running, but also which production has currently been set for this card.
  • the circuit shown in FIG. 5a for monitoring the actual ratio of runtime to lactation is not essential. Alternative proposals have already been listed in EU PS 93235.
  • the optimal time period (T) for monitoring can be determined empirically and then preprogrammed.
  • plant in this context comprises a plurality of processing stages which have been linked together in a processing line by suitable fiber transport means and / or control devices.
  • the fibers to be processed pass through the stages in a predetermined order.
  • the fiber transport means is preferably pneumatic, but not necessarily. In any case, the transport process runs automatically, ie without On gripped the operator. It also normally runs continuously, ie this is not a batch transport.
EP88115802A 1987-10-08 1988-09-26 Régulation des étapes d'ouverture de fibres d'une installation de préparation à la filature Expired - Lifetime EP0311831B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CH394787 1987-10-08
CH3947/87 1987-10-08
CH3943/87 1987-10-08
CH394387 1987-10-08

Publications (2)

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EP0311831A1 true EP0311831A1 (fr) 1989-04-19
EP0311831B1 EP0311831B1 (fr) 1991-09-04

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EP88115802A Expired - Lifetime EP0311831B1 (fr) 1987-10-08 1988-09-26 Régulation des étapes d'ouverture de fibres d'une installation de préparation à la filature

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US (1) US4876769A (fr)
EP (1) EP0311831B1 (fr)
JP (1) JPH01111023A (fr)
CN (1) CN1020932C (fr)
DE (1) DE3864647D1 (fr)
ES (1) ES2026983T3 (fr)
IN (1) IN171722B (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0399315A1 (fr) * 1989-05-23 1990-11-28 Maschinenfabrik Rieter Ag Opération de nettoyage optimal
EP0410429A1 (fr) * 1989-07-26 1991-01-30 Maschinenfabrik Rieter Ag Procédé et dispositif pour faire fonctionner une installation de filature
DE3924274A1 (de) * 1989-07-22 1991-01-31 Zinser Textilmaschinen Gmbh Transporteinrichtung zum zufuehren und abtransportieren von vollen und leeren packungstraegern zu und von wenigstens einer spinnereimaschine
EP0434639A1 (fr) * 1989-12-14 1991-06-26 FRATELLI MARZOLI & C. S.p.A. Système de travail pour préparer le matériau de coton à filage
US5038438A (en) * 1990-03-21 1991-08-13 Industrial Innovators, Inc. Automated yarn manufacturing system
EP0548023A1 (fr) * 1991-12-17 1993-06-23 Maschinenfabrik Rieter Ag Commande de débit d'une ligne de nettoyage
DE19630018A1 (de) * 1996-07-25 1998-01-29 Rieter Ag Maschf Anlage zum Verarbeiten von Fasern
EP1167591A1 (fr) * 2000-06-23 2002-01-02 Maschinenfabrik Rieter Ag Facteur de transfert
US6408221B1 (en) 1989-05-23 2002-06-18 Maschinenfabrik Reiter Ag Method of and installation for optimizing the process of cleaning cotton
WO2010054497A1 (fr) * 2008-11-14 2010-05-20 Uster Technologies Ag Procédé de surveillance d’un procédé de fabrication dans une usine textile
WO2016091340A1 (fr) * 2014-12-13 2016-06-16 TRüTZSCHLER GMBH & CO. KG Procédé et dispositif pour alimenter une installation en fibres
CH713861A1 (de) * 2017-06-08 2018-12-14 Rieter Ag Maschf Produktionssteuerung in einer Putzerei.

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5509179A (en) * 1990-06-25 1996-04-23 Mondini; Giancarlo Autoleveller draw frame having process feed back control system
US5517404A (en) * 1991-01-23 1996-05-14 Biber; Heinz Process control in the textile plant
US5515266A (en) * 1992-01-12 1996-05-07 Meyer; Urs Textile spinning machine management system
EP0810309B1 (fr) 1996-05-20 2004-09-29 Maschinenfabrik Rieter Ag Installation pour le traitement de fibres
EP1103640B1 (fr) 1999-11-24 2004-03-03 Maschinenfabrik Rieter Ag Ligne de nettoyage sélective
JP3951670B2 (ja) * 2001-11-02 2007-08-01 オムロン株式会社 中央管理装置、センサネットワークシステム、センサ管理装置、情報処理プログラム、および該プログラムを記録したコンピュータ読み取り可能な記録媒体
JP3951671B2 (ja) * 2001-11-02 2007-08-01 オムロン株式会社 センサ管理装置、センサネットワークシステム、情報処理プログラム、および該プログラムを記録したコンピュータ読み取り可能な記録媒体
CH714843A1 (de) * 2018-03-29 2019-09-30 Rieter Ag Maschf Speisevorrichtung zu einer Karde.

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Publication number Priority date Publication date Assignee Title
US3862473A (en) * 1971-12-22 1975-01-28 Zellweger Uster Ag Control of the filling level of silver reservoirs in the textile industry
FR2515695A1 (fr) * 1981-10-31 1983-05-06 Truetzschler & Co Procede et systeme de regulation pour produire un ruban de fibre uniforme sur une carde
DE3205776A1 (de) * 1982-02-18 1983-08-25 Truetzschler & Co Vorrichtung zur regulierung der einer textilmaschine zuzufuehrenden fasermenge
FR2534600A1 (fr) * 1982-10-13 1984-04-20 Truetzschler & Co Procede et dispositif de commande et/ou regulation d'une installation de preparation a la filature
EP0176661B1 (fr) * 1984-09-25 1992-01-08 Zellweger Luwa Ag Procédé et dispositif pour l'étirage optimal dans les bancs d'étirage régulateur de l'industrie textile

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Publication number Priority date Publication date Assignee Title
US4163927A (en) * 1977-05-04 1979-08-07 Fiber Controls Corporation Auto-leveler circuit
DE2944428C2 (de) * 1979-11-03 1984-08-30 Trützschler GmbH & Co KG, 4050 Mönchengladbach Vorrichtung zur Produktionssteuerung und Bandregulierung einer Karde
DE3120133C2 (de) * 1981-05-20 1985-05-09 Trützschler GmbH & Co KG, 4050 Mönchengladbach Vorrichtung zur Regelung und Steuerung einer Karde oder Krempel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3862473A (en) * 1971-12-22 1975-01-28 Zellweger Uster Ag Control of the filling level of silver reservoirs in the textile industry
FR2515695A1 (fr) * 1981-10-31 1983-05-06 Truetzschler & Co Procede et systeme de regulation pour produire un ruban de fibre uniforme sur une carde
DE3205776A1 (de) * 1982-02-18 1983-08-25 Truetzschler & Co Vorrichtung zur regulierung der einer textilmaschine zuzufuehrenden fasermenge
FR2534600A1 (fr) * 1982-10-13 1984-04-20 Truetzschler & Co Procede et dispositif de commande et/ou regulation d'une installation de preparation a la filature
EP0176661B1 (fr) * 1984-09-25 1992-01-08 Zellweger Luwa Ag Procédé et dispositif pour l'étirage optimal dans les bancs d'étirage régulateur de l'industrie textile

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0641876A1 (fr) * 1989-05-23 1995-03-08 Maschinenfabrik Rieter Ag Optimisation du nettoyage
EP0399315A1 (fr) * 1989-05-23 1990-11-28 Maschinenfabrik Rieter Ag Opération de nettoyage optimal
US6408221B1 (en) 1989-05-23 2002-06-18 Maschinenfabrik Reiter Ag Method of and installation for optimizing the process of cleaning cotton
DE3924274A1 (de) * 1989-07-22 1991-01-31 Zinser Textilmaschinen Gmbh Transporteinrichtung zum zufuehren und abtransportieren von vollen und leeren packungstraegern zu und von wenigstens einer spinnereimaschine
US5086616A (en) * 1989-07-22 1992-02-11 Zinser Textilmaschinen Gmbh Transport system for production of textile filament
EP0410429A1 (fr) * 1989-07-26 1991-01-30 Maschinenfabrik Rieter Ag Procédé et dispositif pour faire fonctionner une installation de filature
DE3924779A1 (de) * 1989-07-26 1991-01-31 Rieter Ag Maschf Verfahren und vorrichtung zum betrieb einer spinnereilinie
EP0434639A1 (fr) * 1989-12-14 1991-06-26 FRATELLI MARZOLI & C. S.p.A. Système de travail pour préparer le matériau de coton à filage
US5038438A (en) * 1990-03-21 1991-08-13 Industrial Innovators, Inc. Automated yarn manufacturing system
EP0548023A1 (fr) * 1991-12-17 1993-06-23 Maschinenfabrik Rieter Ag Commande de débit d'une ligne de nettoyage
DE19630018A1 (de) * 1996-07-25 1998-01-29 Rieter Ag Maschf Anlage zum Verarbeiten von Fasern
EP1167591A1 (fr) * 2000-06-23 2002-01-02 Maschinenfabrik Rieter Ag Facteur de transfert
WO2010054497A1 (fr) * 2008-11-14 2010-05-20 Uster Technologies Ag Procédé de surveillance d’un procédé de fabrication dans une usine textile
WO2016091340A1 (fr) * 2014-12-13 2016-06-16 TRüTZSCHLER GMBH & CO. KG Procédé et dispositif pour alimenter une installation en fibres
CH713861A1 (de) * 2017-06-08 2018-12-14 Rieter Ag Maschf Produktionssteuerung in einer Putzerei.
US10619270B2 (en) 2017-06-08 2020-04-14 Maschinenfabrik Rieter Ag Production control in a blow room

Also Published As

Publication number Publication date
US4876769A (en) 1989-10-31
EP0311831B1 (fr) 1991-09-04
IN171722B (fr) 1992-12-19
DE3864647D1 (de) 1991-10-10
ES2026983T3 (es) 1992-05-16
CN1032822A (zh) 1989-05-10
JPH01111023A (ja) 1989-04-27
CN1020932C (zh) 1993-05-26

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