EP0963319B1 - Method for controlling air speed in a sterilizing tunnel during the heating of same tunnel - Google Patents

Method for controlling air speed in a sterilizing tunnel during the heating of same tunnel Download PDF

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Publication number
EP0963319B1
EP0963319B1 EP98905254A EP98905254A EP0963319B1 EP 0963319 B1 EP0963319 B1 EP 0963319B1 EP 98905254 A EP98905254 A EP 98905254A EP 98905254 A EP98905254 A EP 98905254A EP 0963319 B1 EP0963319 B1 EP 0963319B1
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Prior art keywords
tunnel
air
fan
during
speed
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EP98905254A
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German (de)
French (fr)
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EP0963319A1 (en
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Ingbert Pennekamp
Klaus Hillebrand
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65BMACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B55/00Preserving, protecting or purifying packages or package contents in association with packaging
    • B65B55/02Sterilising, e.g. of complete packages
    • B65B55/025Packaging in aseptic tunnels
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65BMACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B55/00Preserving, protecting or purifying packages or package contents in association with packaging
    • B65B55/02Sterilising, e.g. of complete packages
    • B65B55/04Sterilising wrappers or receptacles prior to, or during, packaging
    • B65B55/10Sterilising wrappers or receptacles prior to, or during, packaging by liquids or gases

Definitions

  • the invention relates to a method for controlling the Air speed in a sterilizing tunnel during this Heating phase according to the preamble of claim 1.
  • Sterilization tunnels are used especially for sterilization of ampoules, vials or the like in the pharmaceutical Packaging industry used.
  • filter elements for cleaning in the sterilization tunnel circulated air arranged. So that these filter elements on the one hand not damaged, and on the other hand theirs have optimal cleaning effect and no particles from the Filter elements are torn out it is necessary that the filter elements with a certain air speed be flowed through.
  • a known method of this type is used to achieve an almost constant air velocity at different Temperatures in the sterilization tunnel during this Heating phase used speedometers that over a control device is coupled to a fan, its speed according to the measured air speed is changed.
  • a disadvantage of the known method is that the air speed measuring devices due to the im Sterilization tunnels achieved high temperatures, for example 350 degrees Celcius at the end of the heating phase, only a small one Have service life.
  • the well-known sterilization tunnels due to the additional measuring devices and control devices complex. Also measurement errors, for example due to contamination of the measuring devices, not recognized, so that the sterilization process is not carried out safely can be. This is because due to a wrong measured air speed the speed of the fan is also set incorrectly, so that the filter elements not working optimally.
  • Fan speed set constant so that this for example at 350 degrees Celcius is 0.5 meters per second.
  • the sterilization tunnel must be cold however, an air speed of approximately 0.9 meters per second can be set.
  • Reduces during heating the increased air speed set first due to the warming of the air automatically on the at Air speed required for sterilization operation. however are increased at the beginning of the heating phase by the Air speed and thus large amount of air in the intake area or arranged in the blow-out area of the fan Filter elements heavily loaded.
  • the method according to the invention for controlling the air speed in a sterilization tunnel during its heating phase with the characterizing features of claim 1 has the advantage that it without additional air speed measuring devices works and sufficient at the same time is precise, with the filter elements always optimal work. It follows that the blower or the filter do not need to be reinforced and that the sterilization process works safely. According to the invention, this is achieved by that the fan speed according to a predetermined Functional history is changed.
  • Air speed control method in a sterilization tunnel during its heating phase result from the subclaims and the description.
  • the sterilizing tunnel 10 shown in FIG. 1 serves for treating pharmaceutical containers 11 such as ampoules, Vials or similar before filling them. For this it is necessary to sterilize the non-sterile delivered containers 11. This takes place in the sterilizing tunnel 10 in that the previously wet cleaned containers 11 in the sterilization tunnel 10 are introduced, wherein they by means of a horizontal rotating, continuously driven conveyor belt 12 first in an inlet area, not shown be preheated from room temperature to approx. 40 degrees Celsius. The containers 11 then reach the area of the hot part 13 shown in Figure 1, in which the Containers 11 are further heated to about 350 degrees Celsius, whereby the heating and a hot air flow Killing germs or similar he follows. Finally, the containers 11 in a cooling area, also not shown cooled back to room temperature from where it goes into a bottling line to get redirected.
  • pharmaceutical containers 11 such as ampoules, Vials or similar
  • the sterilizing tunnel 10 has a tunnel-shaped one in the heating part 13 Area 14 with lateral boundary walls 15, in which the containers 11 stand upright on the conveyor belt 12 are arranged.
  • a suction filter 17 which in one arranged laterally from area 14, by means of one Boundary wall 15 separated channel 18 opens.
  • a heating device 20 is also provided, the the aspirated air to the required sterilizing temperature heated.
  • the air passes from the heater 20 in a speed controllable arranged above the area 14 Fan 21, which sucks in the air and in the Heater 20 heated air over a directly above of the region 14 arranged sterile filter 23 as vertical hot air flow into the area from top to bottom 14 heads.
  • a grid floor 24 is provided below which a Exhaust area 26 is arranged.
  • the exhaust air area 26 opens out firstly in channel 18 and secondly via a second fan 27 in the inlet area of the sterilization tunnel 10 a portion of the humid air is extracted.
  • a temperature sensor 29 arranged with the control device, not shown of the sterilizing tunnel 10 is connected.
  • the sterilization tunnel 10 described above works as follows: During the commissioning of the sterilization tunnel 10 the air located in area 14 by means of the heating device 20 from room temperature to the required sterilizing temperature, for example, 350 degrees Celsius. The air is circulated with the aid of the fan 21. To ensure the optimal function of the sterile filter 23 during the Ensuring sterilization is a flow rate of, for example, 0.5 m / s, for which purpose a certain fan speed is necessary. This fan speed would, however, flow at room temperature correspond to the air of about 0.9 m / s, what should be avoided so that no particles from the sterile filter 23 are torn.
  • the invention the fan speed determined in advance, which at Room temperature a flow rate of also Corresponds to 0.5 m / s.
  • This the control device of the sterilization tunnel 10 fan speed known as input value or start value is below that required at 350 degrees Celsius Fan speed for the same flow speed the air.
  • the control device the fan speed steadily, so that during the heating phase almost the same over the entire temperature range Flow velocity prevails in area 14.
  • the fan speed is above the known one or steadily determined pre-heating time or gradually increased.
  • this is preferred by the temperature sensor 29 supplied to the control device as an input value Signal used, based on which the control device the speed, for example, via a linear relationship increased with increasing temperature.
  • the connection between the temperature and the required fan speeds can, however, also be based on one stored in the control device more complex functional context take place if there are, for example, flow resistances above the air temperature do not change linearly.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ventilation (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Verfahren zur Steuerung der Luftgeschwindigkeit in einem Sterilisiertunnel während dessen Aufheizphase nach dem Oberbegriff des Anspruchs 1. Derartige Sterilisiertunnel werden insbesondere zur Sterilisation von Ampullen, Vials oder ähnlichem in der pharmazeutischen Verpackungsindustrie verwendet. In den Sterilisiertunneln sind Filterelemente zum Reinigen der im Sterilisiertunnel umgewälzten Luft angeordnet. Damit diese Filterelemente einerseits nicht beschädigt werden, sowie andererseits ihre optimale Reinigungswirkung haben und keine Partikel aus den Filterelementen herausgerissen werden ist es erforderlich, daß die Filterelemente mit einer bestimmten Luftgeschwindigkeit durchströmt werden.The invention relates to a method for controlling the Air speed in a sterilizing tunnel during this Heating phase according to the preamble of claim 1. Such Sterilization tunnels are used especially for sterilization of ampoules, vials or the like in the pharmaceutical Packaging industry used. In the sterilization tunnels are filter elements for cleaning in the sterilization tunnel circulated air arranged. So that these filter elements on the one hand not damaged, and on the other hand theirs have optimal cleaning effect and no particles from the Filter elements are torn out it is necessary that the filter elements with a certain air speed be flowed through.

Bei einem bekannten Verfahren dieser Art werden zum Erzielen einer nahezu konstanten Luftgeschwindigkeit bei verschiedenen Temperaturen in dem Sterilisiertunnel während dessen Aufheizphase Geschwindigkeitsmeßgeräte eingesetzt, die über eine Steuereinrichtung mit einem Ventilator gekoppelt sind, dessen Drehzahl entsprechend der gemessenen Luftgeschwindigkeit verändert wird. Nachteilig bei dem bekannten Verfahren ist, daß die Luftgeschwindigkeitsmeßgeräte aufgrund der im Sterilisiertunnel erzielten hohen Temperaturen, zum Beispiel 350 Grad Celcius am Ende der Aufheizphase, nur eine geringe Standzeit aufweisen. Weiterhin sind die bekannten Sterilisiertunnel aufgrund der zusätzlichen Meßgeräte und Steuereinrichtungen aufwendig aufgebaut. Auch werden Meßfehler, zum Beispiel durch Verschmutzung der Meßgeräte, nicht erkannt, so daß der Sterilisationsprozeß nicht sicher ausgeführt werden kann. Dies deshalb, da aufgrund einer falsch gemessenen Luftgeschwindigkeit die Drehzahl des Ventilators ebenfalls falsch eingestellt wird, so daß die Filterelemente nicht optimal arbeiten.A known method of this type is used to achieve an almost constant air velocity at different Temperatures in the sterilization tunnel during this Heating phase used speedometers that over a control device is coupled to a fan, its speed according to the measured air speed is changed. A disadvantage of the known method is that the air speed measuring devices due to the im Sterilization tunnels achieved high temperatures, for example 350 degrees Celcius at the end of the heating phase, only a small one Have service life. Furthermore, the well-known sterilization tunnels due to the additional measuring devices and control devices complex. Also measurement errors, for example due to contamination of the measuring devices, not recognized, so that the sterilization process is not carried out safely can be. This is because due to a wrong measured air speed the speed of the fan is also set incorrectly, so that the filter elements not working optimally.

Weiterhin ist es bei einem anderen Verfahren bekannt, die Ventilatordrehzahl konstant einzustellen, so daß diese beispielsweise bei 350 Grad Celcius 0,5 Meter pro Sekunde beträgt. Um dies zu erreichen muß bei kaltem Sterilisiertunnel jedoch eine Luftgeschwindigkeit von ca. 0,9 Meter pro Sekunde eingestellt werden. Während des Aufheizens reduziert sich die dabei zuerst eingestellte erhöhte Luftgeschwindigkeit aufgrund der Erwärmung der Luft automatisch auf die beim Sterilisationsbetrieb erforderliche Luftgeschwindigkeit. Jedoch werden zu Beginn der Aufheizphase durch die erhöhte Luftgeschwindigkeit und somit große Luftmenge die im Ansaugbereich bzw. im Ausblasbereich des Ventilators angeordneten Filterelemente stark belastet. Weiterhin muß der Ventilator für die große Luftmenge entsprechend stark ausgelegt werden. Somit benötigt auch dieses Verfahren einen relativ hohen vorrichtungstechnischen Aufwand.Furthermore, in another method it is known that Fan speed set constant, so that this for example at 350 degrees Celcius is 0.5 meters per second. To achieve this, the sterilization tunnel must be cold however, an air speed of approximately 0.9 meters per second can be set. Reduces during heating the increased air speed set first due to the warming of the air automatically on the at Air speed required for sterilization operation. however are increased at the beginning of the heating phase by the Air speed and thus large amount of air in the intake area or arranged in the blow-out area of the fan Filter elements heavily loaded. Furthermore, the fan designed for the large amount of air accordingly strong. This method therefore also requires a relatively high level device-related effort.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Verfahren zur Steuerung der Luftgeschwindigkeit in einem Sterilisiertunnel während dessen Aufheizphase mit den kennzeichnenden Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, daß es ohne zusätzliche Luftgeschwindigkeitsmeßgeräte arbeitet und gleichzeitig hinreichend präzise ist, wobei die Filterelemente stets optimal arbeiten. Daraus folgt, daß das Gebläse bzw. die Filter nicht verstärkt werden müssen und daß der Sterilisationsprozeß sicher arbeitet. Erfindungsgemäß wird dies dadurch erreicht, daß die Ventilatordrehzahl entsprechend eines vorgegebenen Funktionsverlaufes verändert wird.The method according to the invention for controlling the air speed in a sterilization tunnel during its heating phase with the characterizing features of claim 1 has the advantage that it without additional air speed measuring devices works and sufficient at the same time is precise, with the filter elements always optimal work. It follows that the blower or the filter do not need to be reinforced and that the sterilization process works safely. According to the invention, this is achieved by that the fan speed according to a predetermined Functional history is changed.

Weitere Vorteile und vorteilhafte Weiterbildungen des erfindungsgemäßen Verfahrens zur Steuerung der Luftgeschwindigkeit in einem Sterilisiertunnel während dessen Aufheizphase ergeben sich aus den Unteransprüchen und der Beschreibung.Further advantages and advantageous developments of the invention Air speed control method in a sterilization tunnel during its heating phase result from the subclaims and the description.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird in der nachfolgenden Beschreibung näher erläutert. Die einzige Figur zeigt einen vereinfachten Querschnitt durch einen Sterilisiertunnel.An embodiment of the invention is in the drawing shown and is described in more detail in the following description explained. The only figure shows a simplified cross section through a sterilization tunnel.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Der in der Figur 1 dargestellte Sterilisiertunnel 10 dient zum Behandeln von pharmazeutischen Behältnissen 11 wie Ampullen, Vials o.ä. vor deren Befüllen. Dazu ist es erforderlich, die unsteril angelieferten Behältnisse 11 zu sterilisieren. Dies erfolgt im Sterilisiertunnel 10 dadurch, daß die vorab naß gereinigten Behältnisse 11 in den Sterilisiertunnel 10 eingebracht werden, worin sie mittels eines horizontal umlaufenden, kontinuierlich angetriebenen Transportbandes 12 zuerst in einem nicht dargestellten Einlaufbereich von Raumtemperatur auf ca. 40 Grad Celcius vorerwärmt werden. Anschließend gelangen die Behältnisse 11 in den Bereich des in der Figur 1 dargestellten Heißteils 13, in dem die Behältnisse 11 auf ca. 350 Grad Celcius weiter erwärmt werden, wobei durch die Erwärmung und einen Heißluftstrom das Abtöten von Keimen o.ä. erfolgt. Zuletzt werden die Behältnisse 11 in einem ebenfalls nicht dargestellten Kühlbereich wieder auf Raumtemperatur abgekühlt, von wo sie in eine Abfüllanlage weitergeleitet werden.The sterilizing tunnel 10 shown in FIG. 1 serves for treating pharmaceutical containers 11 such as ampoules, Vials or similar before filling them. For this it is necessary to sterilize the non-sterile delivered containers 11. This takes place in the sterilizing tunnel 10 in that the previously wet cleaned containers 11 in the sterilization tunnel 10 are introduced, wherein they by means of a horizontal rotating, continuously driven conveyor belt 12 first in an inlet area, not shown be preheated from room temperature to approx. 40 degrees Celsius. The containers 11 then reach the area of the hot part 13 shown in Figure 1, in which the Containers 11 are further heated to about 350 degrees Celsius, whereby the heating and a hot air flow Killing germs or similar he follows. Finally, the containers 11 in a cooling area, also not shown cooled back to room temperature from where it goes into a bottling line to get redirected.

Der Sterilisiertunnel 10 weist im Heizteil 13 einen tunnelförmigen Bereich 14 mit seitlichen Begrenzungswänden 15 auf, in dem die Behältnisse 11 aufrecht stehend auf dem Transportband 12 angeordnet sind. Zur Erneuerung des Heißluftstroms ist in einem Durchbruch einer Gehäusewand 16 des Sterilisiertunnels 10 ein Ansaugfilter 17 integriert, der in einen seitlich vom Bereich 14 angeordneten, mittels der einen Begrenzungswand 15 abgetrennten Kanal 18 mündet. Im Kanal 18 ist weiterhin eine Heizeinrichtung 20 vorgesehen, die die angesaugte Luft auf die erforderliche Sterilisiertemperatur erhitzt. Von der Heizeinrichtung 20 gelangt die Luft in einen oberhalb des Bereichs 14 angeordneten drehzahlregelbaren Ventilator 21, der die Luft ansaugt und die in der Heizeinrichtung 20 erwärmte Luft über einen direkt oberhalb des Bereichs 14 angeordneten Sterilfilter 23 als vertikal von oben nach unten gerichteten Heißluftstrom in den Bereich 14 leitet. Unterhalb des Transportbandes 12, das aus einem Edelstahl-Drahtgeflecht besteht und somit luftdurchlässig ist, ist ein Gitterboden 24 vorgesehen, unterhalb dessen ein Abluftbereich 26 angeordnet ist. Der Abluftbereich 26 mündet zum einen in den Kanal 18 und zum anderen wird über einen zweiten Ventilator 27 im Einlaufbereich des Sterilisiertunnels 10 ein Teil der feuchten Luft abgesaugt. Zur Überwachung der Lufttemperatur im Bereich 14 ist oberhalb der Behältnisse 11 in einer Begrenzungswand 15 ein Temperatursensor 29 angeordnet, der mit der nicht dargestellten Steuereinrichtung des Sterilisiertunnels 10 verbunden ist. The sterilizing tunnel 10 has a tunnel-shaped one in the heating part 13 Area 14 with lateral boundary walls 15, in which the containers 11 stand upright on the conveyor belt 12 are arranged. To renew the hot air flow is in an opening in a housing wall 16 of the sterilization tunnel 10 integrated a suction filter 17, which in one arranged laterally from area 14, by means of one Boundary wall 15 separated channel 18 opens. In the channel 18, a heating device 20 is also provided, the the aspirated air to the required sterilizing temperature heated. The air passes from the heater 20 in a speed controllable arranged above the area 14 Fan 21, which sucks in the air and in the Heater 20 heated air over a directly above of the region 14 arranged sterile filter 23 as vertical hot air flow into the area from top to bottom 14 heads. Below the conveyor belt 12, which consists of a Stainless steel wire mesh is made and therefore breathable is, a grid floor 24 is provided, below which a Exhaust area 26 is arranged. The exhaust air area 26 opens out firstly in channel 18 and secondly via a second fan 27 in the inlet area of the sterilization tunnel 10 a portion of the humid air is extracted. For surveillance the air temperature in area 14 is above the containers 11 in a boundary wall 15 a temperature sensor 29 arranged with the control device, not shown of the sterilizing tunnel 10 is connected.

Der oben beschriebene Sterilisiertunnel 10 arbeitet wie folgt: Während der Inbetriebnahme des Sterilisiertunnels 10 wird die im Bereich 14 befindliche Luft mittels der Heizeinrichtung 20 von Raumtemperatur auf die erforderliche Sterilisiertemperatur, beispielsweise 350 Grad Celsius, erwärmt. Dabei wird die Luft mit Hilfe des Ventilators 21 umgewälzt. Um die optimale Funktion des Sterilfilters 23 während des Sterilisierens zu gewährleisten ist dabei eine Strömungsgeschwindigkeit von zum Beispiel 0,5 m/s erforderlich, wozu eine bestimmte Ventilatordrehzahl notwendig ist. Diese Ventilatordrehzahl würde bei Raumtemperatur jedoch einer Strömungsgeschwindigkeit der Luft von etwa 0,9 m/s entsprechen, was vermieden werden soll, damit keine Partikel aus dem Sterilfilter 23 gerissen werden. Aus diesem Grund wird erfindungsgemäß vorab die Ventilatordrehzahl ermittelt, die bei Raumtemperatur einer Strömungsgeschwindigkeit von ebenfalls 0,5 m/s entspricht. Diese der Steuereinrichtung des Sterilisiertunnels 10 als Eingangswert bzw. Startwert bekannte Ventilatordrehzahl liegt unterhalb der bei 350 Grad Celsius erforderlichen Ventilatordrehzahl für dieselbe Strömungsgeschwindigkeit der Luft. Während der Aufheizheizphase des Sterilisiertunnels 10 erhöht nunmehr die Steuereinrichtung stetig die Ventilatordrehzahl, so daß während der Aufheizphase über den gesamten Temperaturbereich nahezu dieselbe Strömungsgeschwindigkeit im Bereich 14 herrscht.The sterilization tunnel 10 described above works as follows: During the commissioning of the sterilization tunnel 10 the air located in area 14 by means of the heating device 20 from room temperature to the required sterilizing temperature, for example, 350 degrees Celsius. The air is circulated with the aid of the fan 21. To ensure the optimal function of the sterile filter 23 during the Ensuring sterilization is a flow rate of, for example, 0.5 m / s, for which purpose a certain fan speed is necessary. This fan speed would, however, flow at room temperature correspond to the air of about 0.9 m / s, what should be avoided so that no particles from the sterile filter 23 are torn. For this reason, the invention the fan speed determined in advance, which at Room temperature a flow rate of also Corresponds to 0.5 m / s. This the control device of the sterilization tunnel 10 fan speed known as input value or start value is below that required at 350 degrees Celsius Fan speed for the same flow speed the air. During the heating phase of the Sterilization tunnel 10 now increases the control device the fan speed steadily, so that during the heating phase almost the same over the entire temperature range Flow velocity prevails in area 14.

Im einfachsten Fall wird die Ventilatordrehzahl über der bekannten oder vorab ermittelten Aufheizzeit stetig oder schrittweise erhöht. Bevorzugt wird jedoch das vom Temperatursensor 29 der Steuereinrichtung als Eingangswert zugeführte Signal verwendet, anhand dessen die Steuereinrichtung die Drehzahl beispielsweise über einen linearen Zusammenhang bei steigender Temperatur erhöht. Der Zusammenhang zwischen der Temperatur und der erforderlichen Ventilatordrehzahlen kann jedoch auch anhand eines in der Steuereinrichtung abgelegten komplexeren Funktionszusammenhangs erfolgen, wenn sich beispielsweise Strömungswiderstände über der Lufttemperatur nicht linear ändern.In the simplest case, the fan speed is above the known one or steadily determined pre-heating time or gradually increased. However, this is preferred by the temperature sensor 29 supplied to the control device as an input value Signal used, based on which the control device the speed, for example, via a linear relationship increased with increasing temperature. The connection between the temperature and the required fan speeds can, however, also be based on one stored in the control device more complex functional context take place if there are, for example, flow resistances above the air temperature do not change linearly.

Claims (4)

  1. Method for controlling the air speed in a sterilizing tunnel (10) during the heat-up phase of the latter, in which the rotational speed of a fan (21) is increased from a starting value at a first temperature, which is below a sterilization temperature, to an end value at the sterilization temperature, so that the air flow rate is virtually constant during the heat-up phase, characterized in that the rotational speed of the fan (21) during the heat-up phase is increased from the starting value, which is stored in the control device, up to the end value on the basis of a predetermined function.
  2. Method according to Claim 1, characterized in that the functional curve is a linear function.
  3. Method according to Claim 1 or 2, characterized in that the rotational speed of the fan (21) is altered taking account of a temperature which has been determined by a sensor (29).
  4. Method according to Claim 1 or 2, characterized in that the rotational speed of the fan (21) is altered taking account of the heat-up time required.
EP98905254A 1997-03-06 1998-01-14 Method for controlling air speed in a sterilizing tunnel during the heating of same tunnel Expired - Lifetime EP0963319B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19709067 1997-03-06
DE19709067A DE19709067A1 (en) 1997-03-06 1997-03-06 Procedure for controlling the air speed in a sterilization tunnel during the heating phase
PCT/DE1998/000106 WO1998039216A1 (en) 1997-03-06 1998-01-14 Method for controlling air speed in a sterilizing tunnel during the heating of same tunnel

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EP0963319A1 EP0963319A1 (en) 1999-12-15
EP0963319B1 true EP0963319B1 (en) 2003-08-06

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EP (1) EP0963319B1 (en)
JP (1) JP4198194B2 (en)
CN (1) CN1163382C (en)
DE (2) DE19709067A1 (en)
WO (1) WO1998039216A1 (en)

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JP2001513736A (en) 2001-09-04
CN1163382C (en) 2004-08-25
DE19709067A1 (en) 1998-09-17
DE59809211D1 (en) 2003-09-11
JP4198194B2 (en) 2008-12-17
CN1249721A (en) 2000-04-05
EP0963319A1 (en) 1999-12-15
WO1998039216A1 (en) 1998-09-11
US6383449B1 (en) 2002-05-07

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