WO1993005696A1 - Process for controlling and regulating the detergent supply to a dish-washer - Google Patents
Process for controlling and regulating the detergent supply to a dish-washer Download PDFInfo
- Publication number
- WO1993005696A1 WO1993005696A1 PCT/EP1992/002160 EP9202160W WO9305696A1 WO 1993005696 A1 WO1993005696 A1 WO 1993005696A1 EP 9202160 W EP9202160 W EP 9202160W WO 9305696 A1 WO9305696 A1 WO 9305696A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rinsing
- phase
- cycle
- detergent
- cleaning
- 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.)
- Ceased
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Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/24—Washing or rinsing machines for crockery or tableware with movement of the crockery baskets by conveyors
- A47L15/241—Washing or rinsing machines for crockery or tableware with movement of the crockery baskets by conveyors the dishes moving in a horizontal plane
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
- A47L15/0021—Regulation of operational steps within the washing processes, e.g. optimisation or improvement of operational steps depending from the detergent nature or from the condition of the crockery
- A47L15/0028—Washing phases
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
- A47L15/0055—Metering or indication of used products, e.g. type or quantity of detergent, rinse aid or salt; for measuring or controlling the product concentration
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
- A47L2401/30—Variation of electrical, magnetical or optical quantities
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
- A47L2501/07—Consumable products, e.g. detergent, rinse aids or salt
Definitions
- the invention relates to a method for controlling and regulating the supply of cleaning agent in a dishwasher and to a control device for carrying out the method.
- Conveyor belt dishwashers are used in which the items to be washed pass through several cleaning stations in succession on a conveyor belt.
- a method is known for controlling and regulating the supply of cleaning agent in such dishwashers, which works with a dosing device for the cleaning agent and with a control device, for setting and keeping the cleaning agent concentration constant and for carrying out start-up phases and rinsing phases.
- the control device controls the supply of cleaning agent to the washing tank or tanks of the dishwasher in which the washware is in
- the dishes are washed at a low detergent concentration.
- the normal cycle is divided into a start-up phase and a rinse phase.
- the rinse tank is filled with water and a predetermined first amount of detergent is supplied, so that after the start-up phase in the rinse tank, the rinse water contains the desired detergent concentration.
- the detergent concentration is regulated to a first setpoint A by means of the metering device.
- a disadvantage of the prior art is that the detergent dosing for the basic cleaning must be carried out manually by an operator and that the operator is exposed to health risks which are caused on the one hand by rinsing water vapors and on the other hand by rinsing water drops.
- Another disadvantage is the fact that different cleaning agents must be stored.
- the object of the invention is to facilitate basic cleaning in a dishwasher.
- the method according to the invention works with a control device which carries out a basic cleaning cycle in addition to the normal cycle.
- the same cleaning agent is used in the basic cleaning cycle as in the normal cycle.
- a predetermined second quantity of cleaning agent is supplied, which is substantially larger than the first quantity of cleaning agent in the normal cycle. Characterized that. Rinse water obtained a cleaning agent concentration, basic cleaning can be performed with the in Grund ⁇ cleaning cycle. In a basic cleaning rinsing phase, the detergent concentration is raised to a second setpoint B, which is substantially greater than the first setpoint A of the normal cycle.
- I is a schematic representation of a
- Fig. 2 is a block diagram for an embodiment of the control device according to the invention.
- the dishwasher 1 shown in FIG. 1 is designed as a conveyor belt dishwasher and has three washing tanks 2a, 2b, 2c.
- each washing tank 2a, 2b, 2c there is an overflow 3a, 3b, 3c, via which washing water can overflow from one to another washing tank.
- the overflow 3a of the (based on the running direction of the wash items) first wash tank 2a is connected to a drain 4.
- the fresh water supply takes place via the fresh water rinse 5 arranged at the outlet end of the items to be washed.
- the rinse tanks 2a, 2b, 2c are arranged such that the rinse water cascades from the fresh water rinse 5 first into the third rinse tank 2c, from there into the middle one Rinse tank 2b and finally reaches the drain 4 via the first rinse tank 2a.
- a conveyor belt 6 is located above the wash tanks 2a, 2b, 2c and moves the washware first over the first wash tank 2a, then the middle wash tank 2b and finally the third wash tank 2c to the fresh water rinse 5.
- Above the wash tanks 2a , 2b, 2c are arranged spray registers 7a, 7b and 7c by pumps 8a, 8b and 8c are fed from the respective flushing tank 2a, 2b, 2c located below.
- Each spray register 7a, 7b, 7c is therefore assigned to a washing tank 2a, 2b, 2c and a pump 8a, 8b, 8c located therein.
- the spray registers 7a, 7b, 7c remove the food residues from the items to be washed by means of washing water from spray nozzles which are directed against the items to be washed both from above and from below. With the fresh water rinse 5, the wash ware is also freed from detergent residues.
- the rinsing water is transported from the rinsing tank to the rinsing tank in the opposite direction of the conveyor belt. It is thereby achieved that the third washing tank 2c is the cleanest, the coarsest food residues already being removed above the first washing tank 2a.
- the cleaning agent is supplied for all rinsing tanks 2a, 2b, 2c in the third (last) rinsing tank 2c. This is connected via pipes 9 to a metering device 10 which takes the detergent from a detergent container 11 and conveys it into the washing tank 2c.
- the dosing device works with a constant delivery rate.
- the cleaning agent can be liquid or in powder form. Powder cleaner containing caustic alkali is preferably used, which can also be added in dissolved form.
- a measuring probe 12 is arranged in the third washing tank 2c.
- the measuring probe 12 is designed as a conductivity measuring cell and determines the detergent concentration, which is essentially proportional to the conductivity, via the conductivity of the rinsing water.
- the supply of cleaning agent is controlled and regulated by means of a control and regulating device 13, which evaluates the measured values of the measuring probe 12.
- the control and regulating device 13, the block diagram of which is shown in FIG. 2, evaluates the measurement signals of the measurement probe 12.
- the signals emanating from the measuring probe 12 are fed to a measured value amplifier 14 and a monitoring device 15.
- a display part 16 is connected to the measured value amplifier 14 and displays the current detergent concentration. In addition, the display part 16 can display the target value for the detergent concentration.
- the control and regulating device 13 is equipped with a selector switch 17 for the "normal cleaning" function and a selector switch 18 for the "basic cleaning" function, with which it can be selected whether a normal cycle or a basic cleaning cycle is to be carried out .
- Each selector switch 17, 18 is connected to a measuring range presetting part 19a, 19b, which is connected to the measured value amplifier 14 and, depending on the selected cycle, sets this to a predetermined measuring range when the respective selector switch 17, 18 has been pressed.
- each selector switch 17, 18 has a setpoint generator 20a, 20b, which is adjustable and outputs the set cleaning agent concentration when the selector switch 17, 18 has been pressed.
- the signal representing the target value A, B for the detergent concentration, which emanates from the target value transmitter 20a, 20b, is fed into the monitoring device 15.
- the signal is also led to the display part 16 and there causes the setpoint A, B for the cleaning agent concentration to be displayed.
- Predosing means that the in the rinsing tanks 2a, 2b, 2c, initially clear water is supplied for a time determined by a pre-metering timer 21a, 21b in order to bring the concentration of the rinsing liquor into the desired order.
- abut ⁇ device In order to avoid that takes place in 'failures constant cleaning agent supply', abut ⁇ device is provided. This has a dosing time limiter 22 which is connected to a comparison timer 23. When the dosing device is switched on, the dosing time limiter 22 is also switched on by the monitoring device 15 in the rinsing phase during normal cleaning.
- the Dosierzeitbeskyr 22 compares the elapsed dispensing time which is the time that the metering device has worked 10, with • the preset value from the comparison timer 23 and sends a signal to the monitoring device 15 further, so that the controller 15 after the same period exceed the metering 10 turns off.
- the comparison time can refer to the entire cycle or to a single conveying process.
- the desired value A for the set detergent concentration is between 2.5-8.5 g / l of caustic alkali powder cleaner, preferably about 5 g / l. This corresponds approximately to a conductivity of the rinsing water of 10 Scm or 30 mScm " .
- the selector switch 17 is pressed to initiate the normal cycle, the measuring range of the measuring amplifier 14 is set to the range from 0 to 8.5 g / 1 or 0 to 30 mScm - * contained in the measuring range presetting part 19a.
- the setpoint A for the cleaning agent concentration is supplied by the setpoint generator 20a of the selector switch 17 to the monitoring device 15.
- the comparison time for the dosing time limit set on the selector switch 17 is fed to the dosing time limiter 22.
- the pre-metering timer 21a determines the time for the pre-metering from the first target value A for the cleaning agent concentration.
- the control and regulating device 13 first carries out the start-up phase.
- the monitoring device 15 switches on the metering device 10, which now delivers cleaning agent into the third washing tank 2c at a constant delivery rate.
- the dosing time limit is switched off with the dosing time limiter 22.
- the monitoring device 15 keeps the dosing device 10 switched on until the predefined dosing time has expired.
- the rinsing tanks 2a, 2b, 2c are filled and brought approximately to the required detergent concentration.
- the control and regulating device 13 then switches over to the rinsing phase 32.
- the monitoring device 15 continuously monitors the cleaning agent concentration and keeps it constant by means of two-point control. During the control, the signal emanating from the measuring probe 12 is compared in the monitoring device 15 with the setpoint A from the setpoint generator 20a, and the do- sier worn 10 on or off.
- the dishwashing phase is ended by switching off the dishwasher. If, however, the dosing time has exceeded the predetermined comparison time, that is the limit value given by the comparison timer 23, a warning signal is given and the dishwasher 1 is switched off.
- the basic cleaning cycle corresponds essentially to the normal cycle.
- the contents of the setpoint generator 20b and the measuring range presetting part are transferred to the monitoring device 15, the predosing timer 21b, the display part 16 and the measured value amplifier 14.
- the value stored in the pre-metering timer 21b which corresponds to the pre-metering time determined on the basis of the target value B from the target value transmitter 20b, is correspondingly greater than the value stored in the pre-metering timer 21a.
- the set upon pressing the selection switch 18 in the reference value generator 20b ⁇ target value B is supplied to the display part 16 indicating the target value B.
- the measuring range presetting part 19b is also actuated by pressing, so that the measuring value amplifier 14, which amplifies the signal of the measuring probe 12 and displays it on the display part 16, is set or switched over to a higher measuring range.
- the cleaning agent concentration set is namely 15-35 g / 1, preferably 15 g / 1.
- the set measuring range therefore corresponds to a cleaning agent concentration of 0 - 3 & g / 1.
- the detergent concentration is brought to a much higher value by supplying detergent by means of the metering device 10 than in the normal start-up phase.
- the basic cleaning start-up phase which corresponds to the start-up phase, is followed by the basic cleaning-rinsing phase, which corresponds to the rinsing phase.
- the setpoint B from the setpoint generator 20b, which is fed to the monitoring device 15, is used for two-point control at a high level.
- the cleaning agent concentration is kept constant in the basic cleaning rinsing phase, as in the rinsing phase.
- the dosing time limiter 22 is always switched off in the basic cleaning cycle, i.e. also in the rinsing phase.
- the fresh water supply via the fresh water rinse 5 is switched off and all the rinsing tanks 2a, 2b, 2c are emptied.
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- Washing And Drying Of Tableware (AREA)
Abstract
Description
Verfahren zur Steuerung und Regelung der Reinigungsmittelzufuhr einer Geschirrspülmaschine Method for controlling and regulating the supply of detergent to a dishwasher
Die Erfindung betrifft ein Verfahren zur Steuerung und Regelung der Reinigungsmittelzufuhr einer Geschirr¬ spülmaschine sowie eine Steuereinrichtung zur Durchfüh¬ rung des Verfahrens.The invention relates to a method for controlling and regulating the supply of cleaning agent in a dishwasher and to a control device for carrying out the method.
In Großküchen u.dgl. werden Transportband-Geschirrspül¬ maschinen eingesetzt, in denen das Spülgut auf einem Transportband nacheinander mehrere ReinigungsStationen durchläuft. Zur Steuerung und Regelung der Reinigungs¬ mittelzufuhr bei derartigen Geschirrspülmaschinen ist ein Verfahren bekannt, das mit einer Dosiereinrichtung für das Reingungsmittel und mit einer Steuereinrichtung, für die Einstellung und Konstanthaltung der Reinigungs¬ mittelkonzentration und zur Durchführung von Anlauf¬ phasen und Spülphasen arbeitet. Die Steuereinrichtung steuert die Reinigungsmittelzufuhr zu dem oder den Spül¬ tanks der Geschirrspülmaschine, in der das Spülgut in In canteen kitchens and the like Conveyor belt dishwashers are used in which the items to be washed pass through several cleaning stations in succession on a conveyor belt. A method is known for controlling and regulating the supply of cleaning agent in such dishwashers, which works with a dosing device for the cleaning agent and with a control device, for setting and keeping the cleaning agent concentration constant and for carrying out start-up phases and rinsing phases. The control device controls the supply of cleaning agent to the washing tank or tanks of the dishwasher in which the washware is in
einem Normalzyklus einer Normalreinigung unterzogen wird. In dem Normalzyklus wird das Spülgut bei einer geringen Reinigungsmittelkonzentration gespült. Der Normalzyklus ist in eine Anlaufphase und eine Spülphase gegliedert. In der Anlaufphase wird der Spültank mit Wasser aufgefüllt und eine vorherbestimmte erste Rei¬ nigungsmittelmenge zugeführt, so daß nach Ablauf der Aniaufphase in dem Spültank das Spülwasser die gewünsch¬ te Reinigungsmittelkonzentration enthält. Während der anschließenden Spülphase, in der das Spülgut gereinigt wird und in der Spülwasserverluste kontinuierlich aus¬ geglichen werden, wird die Reinigungsmittelkonzentra¬ tion mitteis der Dosiereinrichtung auf einen ersten Sollwert A geregelt.undergoes a normal cleaning cycle. In the normal cycle, the dishes are washed at a low detergent concentration. The normal cycle is divided into a start-up phase and a rinse phase. In the start-up phase, the rinse tank is filled with water and a predetermined first amount of detergent is supplied, so that after the start-up phase in the rinse tank, the rinse water contains the desired detergent concentration. During the subsequent rinsing phase, in which the wash ware is cleaned and the rinsing water losses are continuously compensated for, the detergent concentration is regulated to a first setpoint A by means of the metering device.
Hartnäckige Speiserückstände, insbesondere kumulierte Stärke, können jedoch mit dem Verfahren nicht entfernt werden, so daß das Spülgut von Zeit zu Zeit etwa monat¬ lich einer Grundreinigung zu unterziehen ist. Bei die¬ ser Grundreinigung wird ein hochwirksames zweites Rei¬ nigungsmittel benutzt, das von Hand dem Spülwasser zu¬ geführt wird. Eine Bedienungsperson verteilt dazu mit einer Schaufel oder einem ähnlichen Gerät das zweite Reinigungsmittel im Innern der Geschirrspülmaschine. Um die Reinigungsmittelkonzentration auf dem erforderli¬ chen hohen Niveau zu halten, werden die Verluste kon¬ tinuierlich von Hand durch weiteres Einstreuen des zweiten Reinigungsmittels ausgeglichen.Stubborn food residues, in particular accumulated starch, cannot be removed with the method, however, so that the items to be washed have to be cleaned from time to time about once a month. In this basic cleaning a highly effective second cleaning agent is used, which is added to the rinsing water by hand. For this purpose, an operator distributes the second cleaning agent inside the dishwasher using a shovel or similar device. In order to keep the detergent concentration at the required high level, the losses are continuously compensated by hand by further sprinkling in the second detergent.
Nachteilig beim Stand der Technik ist, daß die Reiniger¬ dosierung für die Grundreiπigung von Hand von einer Bedienungsperson durchzuführen ist und daß diese ge¬ sundheitlichen Risiken ausgesetzt ist, die einerseits durch Spülwasserdämpfe und andererseits durch Spülwas¬ sertropfen hervorgerufen werden. Nachteilig ist außer- dem, daß unterschiedliche Reinigungsmittel bevorratet werden müssen.A disadvantage of the prior art is that the detergent dosing for the basic cleaning must be carried out manually by an operator and that the operator is exposed to health risks which are caused on the one hand by rinsing water vapors and on the other hand by rinsing water drops. Another disadvantage is the fact that different cleaning agents must be stored.
Der Erfindung liegt die Aufgabe zugrunde, bei einer Ge¬ schirrspülmaschine die Grundreinigung zu erleichtern.The object of the invention is to facilitate basic cleaning in a dishwasher.
Die der Erfindung zugrundeliegende Aufgabe wird durch das Verfahren mit den Merkmalen des Patentanspruchs 1 sowie durch die Vorrichtung zur Durchführung des Ver¬ fahrens mit den Merkmalen des Patentanspruchs 7 gelöst.The object on which the invention is based is achieved by the method having the features of patent claim 1 and by the device for carrying out the method having the features of patent claim 7.
Das erfindungsgemäße Verfahren arbeitet mit einer Steu¬ ereinrichtung, die zusätzlich zu dem Normalzyklus einen Grundreinigungszyklus durchführt. Dabei wird beim Grund¬ reinigungszyklus das gleiche Reinigungsmittel verwendet - wie beim Normalzyklus.The method according to the invention works with a control device which carries out a basic cleaning cycle in addition to the normal cycle. The same cleaning agent is used in the basic cleaning cycle as in the normal cycle.
In einer Grundreinigungs-Anlaufphase wird eine vorher¬ bestimmte zweite Reinigungsmittelmenge zugeführt, die wesentlich größer ist als die erste Reinigungsmittel¬ menge im Normalzyklus. Dadurch erhält das. Spülwasser eine Reinigungsmittelkonzentration, mit der im Grund¬ reinigungszyklus' die Grundreinigung durchgeführt werden kann. In einer Grundreinigungs-Spülphase wird die Rei¬ nigungsmittelkonzentration auf einen zweiten Sollwert B angehoben, der wesentlich größer ist als der erste Soll¬ wert A des Normalzyklus.In a basic cleaning start-up phase, a predetermined second quantity of cleaning agent is supplied, which is substantially larger than the first quantity of cleaning agent in the normal cycle. Characterized that. Rinse water obtained a cleaning agent concentration, basic cleaning can be performed with the in Grund¬ cleaning cycle. In a basic cleaning rinsing phase, the detergent concentration is raised to a second setpoint B, which is substantially greater than the first setpoint A of the normal cycle.
Sowohl für die Zufuhr der ersten und der zweiten Rei¬ nigungsmittelmenge als auch für die Regelung der Rei¬ nigungsmittelkonzentration in der Spülphase und der Grundreinigungs-Spülphase wird dieselbe Regel- und Do¬ siereinrichtung verwendet. Die Anwesenheit einer .Bedie¬ nungsperson und deren Eingreifen ist nicht mehr erfor¬ derlich. Darüberhinaus ist es nicht mehr erforderlich, ein zweites Reinigungsmittel zu bevorraten. Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen sowie aus der Zeichnung im Zusammenhang mit der Beschreibung. Es zeigen:The same control and metering device is used both for supplying the first and the second amount of detergent and for regulating the detergent concentration in the rinsing phase and the basic cleaning rinsing phase. The presence of an operator and their intervention is no longer necessary. In addition, it is no longer necessary to store a second detergent. Advantageous refinements and developments of the invention result from the subclaims and from the drawing in connection with the description. Show it:
Fig. I eine schematische Darstellung einerI is a schematic representation of a
TransportbandgeschirrSpülmaschine mit drei Spültanks undConveyor belt dishwashing machine with three washing tanks and
Fig. 2 ein Blockdiagramm für eine Ausführungsform der erfindungsgemäßen Steuereinrichtung.Fig. 2 is a block diagram for an embodiment of the control device according to the invention.
Die in Fig. I dargestellte Geschirrspülmaschine 1 ist als Transportband-Geschirrspülmaschine ausgeführt und weist drei Spültanks 2a,2b,2c auf. In jedem Spültank 2a,2b,2c befindet sich ein Überlauf 3a,3b,3c, über den Spülwasser von einem in einen anderen Spültank über¬ laufen kann. Der Überlauf 3a des (bezogen auf die Lauf¬ richtung des Spülguts) ersten Spültanks 2a ist mit ei¬ nem Abfluß 4 verbunden. Die Frischwasserzufuhr erfolgt über die am Austrittsende des Spülguts angeordnete Frischwasser-Klarspülung 5. Die Spültanks 2a,2b,2c sind so angeordnet, daß das Spülwasser kaskadenartig von der Frischwasser-Klarspülung 5 zuerst in den dritten Spül¬ tank 2c, von dort in den mittleren Spültank 2b und schließlich über den ersten Spültank 2a in den Abfluß 4 gelangt.The dishwasher 1 shown in FIG. 1 is designed as a conveyor belt dishwasher and has three washing tanks 2a, 2b, 2c. In each washing tank 2a, 2b, 2c there is an overflow 3a, 3b, 3c, via which washing water can overflow from one to another washing tank. The overflow 3a of the (based on the running direction of the wash items) first wash tank 2a is connected to a drain 4. The fresh water supply takes place via the fresh water rinse 5 arranged at the outlet end of the items to be washed. The rinse tanks 2a, 2b, 2c are arranged such that the rinse water cascades from the fresh water rinse 5 first into the third rinse tank 2c, from there into the middle one Rinse tank 2b and finally reaches the drain 4 via the first rinse tank 2a.
Ein Transportband 6 befindet sich oberhalb der Spül¬ tanks 2a,2b,2c und bewegt das Spülgut zuerst über den ersten Spültank 2a, dann den mittleren Spültank 2b und schließlich den dritten Spültank 2c zu der Frischwas¬ ser-Klarspülung 5. Über den Spültanks 2a,2b,2c sind Spritzregister 7a,7b und 7c angeordnet, die von Pumpen 8a,8b und 8c aus dem jeweils darunter befindlichen Spül¬ tank 2a,2b,2c gespeist werden. Jedes Spritzregister 7a,7b,7c ist also einem Spültank 2a,2b,2c und einer darin befindlichen Pumpe 8a,8b,8c zugeordnet. Die Spritzregister 7a,7b,7c entfernen die Speisereste von dem Spülgut mittels Spülwasser aus Spritzdüsen, die sowohl von oben als auch von unten gegen das Spülgut gerichtet sind. Mit der Frischwasser-Klarspülung 5 wird das Spülgut auch von Reinigungsmittelresten befreit.A conveyor belt 6 is located above the wash tanks 2a, 2b, 2c and moves the washware first over the first wash tank 2a, then the middle wash tank 2b and finally the third wash tank 2c to the fresh water rinse 5. Above the wash tanks 2a , 2b, 2c are arranged spray registers 7a, 7b and 7c by pumps 8a, 8b and 8c are fed from the respective flushing tank 2a, 2b, 2c located below. Each spray register 7a, 7b, 7c is therefore assigned to a washing tank 2a, 2b, 2c and a pump 8a, 8b, 8c located therein. The spray registers 7a, 7b, 7c remove the food residues from the items to be washed by means of washing water from spray nozzles which are directed against the items to be washed both from above and from below. With the fresh water rinse 5, the wash ware is also freed from detergent residues.
Der Spülwassertransport von Spültank zu Spültank er¬ folgt entgegen der Laufrichtung des Transportbandes. Dadurch wird erreicht, daß der dritte Spültank 2c der sauberste ist, wobei die gröbsten Speiserückstände schon über dem ersten Spültank 2a entfernt werden.The rinsing water is transported from the rinsing tank to the rinsing tank in the opposite direction of the conveyor belt. It is thereby achieved that the third washing tank 2c is the cleanest, the coarsest food residues already being removed above the first washing tank 2a.
Die Reinigungsmittelzufuhr erfolgt für sämtliche Spül¬ tanks 2a,2b,2c im dritten (letzten) Spültank 2c. Dieser ist über Rohrleitungen 9 mit einer Dosiereinrichtung 10 verbunden, die das Reinigungsmittel einem Reinigungs- mittelbehälter 11 entnimmt und in den Spültank 2c för¬ dert. Die Dosiereinrichtung arbeitet mit konstanter Förderrate. Das Reinigungsmittel kann flüssig sein oder in Pulverform vorliegen. Vorzugsweise wird ätzalkalihal- tiger Pulverreiniger verwendet, der auch in aufgelöster Form zugeführt werden kann. Zur Bestimmung der Reini¬ gungsmittelkonzentration, die in Gramm pro Liter (g/1) Wasser angegeben wird, ist in dem dritten Spültank 2c eine Meßsonde 12 angeordnet. Die Meßsonde 12 ist als Leitfähigkeitsmeßzelle ausgeführt und bestimmt über die Leitfähigkeit des Spülwassers die Reinigungsmittelkon¬ zentration, die im wesentlichen proportional zur Leit¬ fähigkeit ist. Mittels einer Steuer- und Regeleinrich¬ tung 13, die die Meßwerte der Meßsonde 12 auswertet, wird die Reinigungsmittelzufuhr gesteuert und geregelt. Die Steuer- und Regeleinrichtung 13, deren Blockdiagramm in Fig. 2 gezeigt ist, wertet die Meßsignale der Meßson¬ de 12 aus. Dazu werden die von der Meßsonde 12 ausgehen¬ den Signale einem Meßwertverstärker 14 und einer Überwa¬ chungseinrichtung 15 zugeführt. An dem Meßwertverstär¬ ker 14 ist ein Anzeigeteil 16 angeschlossen, das die aktuelle Reinigungsmittelkonzentration anzeigt. Außer¬ dem kann das Anzeigeteil 16 den Sollwert für die Reini¬ gungsmittelkonzentration anzeigen.The cleaning agent is supplied for all rinsing tanks 2a, 2b, 2c in the third (last) rinsing tank 2c. This is connected via pipes 9 to a metering device 10 which takes the detergent from a detergent container 11 and conveys it into the washing tank 2c. The dosing device works with a constant delivery rate. The cleaning agent can be liquid or in powder form. Powder cleaner containing caustic alkali is preferably used, which can also be added in dissolved form. To determine the detergent concentration, which is given in grams per liter (g / 1) of water, a measuring probe 12 is arranged in the third washing tank 2c. The measuring probe 12 is designed as a conductivity measuring cell and determines the detergent concentration, which is essentially proportional to the conductivity, via the conductivity of the rinsing water. The supply of cleaning agent is controlled and regulated by means of a control and regulating device 13, which evaluates the measured values of the measuring probe 12. The control and regulating device 13, the block diagram of which is shown in FIG. 2, evaluates the measurement signals of the measurement probe 12. For this purpose, the signals emanating from the measuring probe 12 are fed to a measured value amplifier 14 and a monitoring device 15. A display part 16 is connected to the measured value amplifier 14 and displays the current detergent concentration. In addition, the display part 16 can display the target value for the detergent concentration.
Die Steuer- und Regeleinrichtung 13 ist mit einem Wahl¬ schalter 17 für die Funktion "Normalreinigung" und ei¬ nem Wahlschalter 18 für die Funktion "Grundreinigung" ausgestattet, mit denen ausgewählt werden kann, ob ein Normalzyklus oder ein Grundreinigungszyklus durchge¬ führt werden soll. Jeder Wahlschalter 17,18 ist mit einem Meßbereich-Voreinstellteil 19a,19b verbunden, das mit dem MeßwertVerstärker 14 verbunden ist und diesen je nach gewähltem Zyklus auf einen vorherbestimmten Meßbereich einstellt, wenn der betreffende Wahlschalter 17,18 gedrückt worden ist. Außerdem weist jeder Wahl- schalter 17,18 einen Sollwertgeber 20a,20b auf, der einstellbar ist und die eingestellte Reinigungsmittei- konzentration ausgibt, wenn der Wahlschalter 17,18 ge¬ drückt worden ist. Das den Sollwert A,B für die Reini¬ gungsmittelkonzentration repräsentierende Signal, das von dem Sollwertgeber 20a,20b ausgeht, wird in die Über¬ wachungseinrichtung 15 eingespeist. Das Signal wird auch zu dem Anzeigeteil 16 geführt und bewirkt dort die Anzeige des Sollwerts A,B für die Reinigungsmittelkon¬ zentration.The control and regulating device 13 is equipped with a selector switch 17 for the "normal cleaning" function and a selector switch 18 for the "basic cleaning" function, with which it can be selected whether a normal cycle or a basic cleaning cycle is to be carried out . Each selector switch 17, 18 is connected to a measuring range presetting part 19a, 19b, which is connected to the measured value amplifier 14 and, depending on the selected cycle, sets this to a predetermined measuring range when the respective selector switch 17, 18 has been pressed. In addition, each selector switch 17, 18 has a setpoint generator 20a, 20b, which is adjustable and outputs the set cleaning agent concentration when the selector switch 17, 18 has been pressed. The signal representing the target value A, B for the detergent concentration, which emanates from the target value transmitter 20a, 20b, is fed into the monitoring device 15. The signal is also led to the display part 16 and there causes the setpoint A, B for the cleaning agent concentration to be displayed.
Während- der Durchführung einer Anlauf hase wird eine Vordosierung durchgeführt. Vordosierung heißt, daß dem in den Spültan s 2a,2b,2c befindlichen, zunächst klaren Wasser für eine von einem Vordosierzeitgeber 21a,21b festgelegte Zeit Reinigungsmittel zugeführt wird, um die Konzentration der Spülflotte in die gewünschte Grö¬ ßenordnung zu bringen.A pre-metering is carried out while a start-up rabbit is being carried out. Predosing means that the in the rinsing tanks 2a, 2b, 2c, initially clear water is supplied for a time determined by a pre-metering timer 21a, 21b in order to bring the concentration of the rinsing liquor into the desired order.
Um zu vermeiden, daß bei' einem Defekt eine ständige Reinigungsmittelzufuhr' erfolgt, ist eine Sicherheits¬ einrichtung vorgesehen. Diese weist einen Dosierzeit¬ begrenzer 22 auf, der mit einem Vergleichszeitgeber 23 verbunden ist. Mit dem Einschalten der Dosiereinrich¬ tung wird in der Spülphase in der Normalreinigung von der Überwachungseinrichtung 15 auch der Dosierzeitbe¬ grenzer 22 eingeschaltet. Der Dosierzeitbegrenzer 22 vergleicht die verstrichene Dosierzeit, das ist die Zeit, die die Dosiereinrichtung 10 gearbeitet hat, mit • dem voreingestellten Wert aus dem Vergleichszeitgeber 23 und leitet ein Signal an die Überwachungseinrichtung 15 weiter, so daß der Regler 15 nach überschreiten der Vergleichszeit die Dosiereinrichtung 10 ausschaltet. Die Vergleichszeit kann auf den gesamten Zyklus oder auf einen einzelnen Fördervorgang bezogen sein.In order to avoid that takes place in 'failures constant cleaning agent supply', a Sicherheits¬ device is provided. This has a dosing time limiter 22 which is connected to a comparison timer 23. When the dosing device is switched on, the dosing time limiter 22 is also switched on by the monitoring device 15 in the rinsing phase during normal cleaning. The Dosierzeitbegrenzer 22 compares the elapsed dispensing time which is the time that the metering device has worked 10, with • the preset value from the comparison timer 23 and sends a signal to the monitoring device 15 further, so that the controller 15 after the same period exceed the metering 10 turns off. The comparison time can refer to the entire cycle or to a single conveying process.
Im folgenden wird der Ablauf des Verfahrens beschrie¬ ben. Nach der Auswahl des Zyklus (Normalzyklus oder Grundreinigungszyklus) erfolgt je nach gewähltem Zyklus die Durchführung einer Anlaufphase oder einer Grund- reinigungs-Anlaufphase.The sequence of the method is described below. After selecting the cycle (normal cycle or basic cleaning cycle), depending on the cycle selected, a start-up phase or a basic cleaning start-up phase is carried out.
Im Normalzyklus, also beim normalen Spülvorgang, be¬ trägt der Sollwert A für die eingestellte Reinigungs¬ mittelkonzentration zwischen 2,5 - 8,5 g/1 ätzalkali- haltigen Pulverreinigers, vorzugsweise etwa 5 g/1. Dies entspricht etwa einer Leitfähigkeit des Spülwassers von 10 Scm bzw. 30 mScm" . Wenn der Wahischalter 17 zum Einleiten des Normalzyklus gedrückt wird, wird der Meßbereich des Meßverstärkers 14 auf den im Meßbereich-Voreinstellteii 19a enthalte¬ nen Bereich von 0 - 8,5 g/1 bzw. 0 - 30 mScm-* einge¬ stellt. Der Sollwert A für die Reinigungsmittelkonzen¬ tration wird von dem Sollwertgeber 20a des Wahlschal¬ ters 17 der Überwachungseinrichtung 15 zugeführt. Die an dem Wahlschalter 17 eingestellte Vergleichszeit für die Dosierzeitbegrenzung wird dem Dosierzeitbegrenzer 22 zugeführt. Aus dem ersten Sollwert A für die Reini- gungsmitteikonzentration wird von dem Vordosierzeit- geber 21a die Zeit für die Vordosierung ermittelt.In the normal cycle, that is to say during the normal rinsing process, the desired value A for the set detergent concentration is between 2.5-8.5 g / l of caustic alkali powder cleaner, preferably about 5 g / l. This corresponds approximately to a conductivity of the rinsing water of 10 Scm or 30 mScm " . When the selector switch 17 is pressed to initiate the normal cycle, the measuring range of the measuring amplifier 14 is set to the range from 0 to 8.5 g / 1 or 0 to 30 mScm - * contained in the measuring range presetting part 19a. The setpoint A for the cleaning agent concentration is supplied by the setpoint generator 20a of the selector switch 17 to the monitoring device 15. The comparison time for the dosing time limit set on the selector switch 17 is fed to the dosing time limiter 22. The pre-metering timer 21a determines the time for the pre-metering from the first target value A for the cleaning agent concentration.
Die Steuer- und Regeleinrichtung 13 führt zunächst die Anlaufphase durch. Hierbei schaltet die Überwachungs¬ einrichtung 15 die Dosiereinrichtung 10 ein, die nun mit konstanter Förderrate Reinigungsmittel in den drit¬ ten Spültank 2c fördert. Hierbei ist mit dem Dosierzeit¬ begrenzer 22 die Dosierzeitbegrenzung abgeschaltet. Die Überwachungseinrichtung 15 hält die Dosiereinrichtung 10 so lange eingeschaltet, bis die festgelegte Vordo- sierzeit abgelaufen ist. Nach Ablauf der Vordosierung sind die Spültanks 2a,2b,2c gefüllt und annähernd auf die erforderliche Reinigungsmittelkonzentration ge¬ bracht.The control and regulating device 13 first carries out the start-up phase. In this case, the monitoring device 15 switches on the metering device 10, which now delivers cleaning agent into the third washing tank 2c at a constant delivery rate. Here, the dosing time limit is switched off with the dosing time limiter 22. The monitoring device 15 keeps the dosing device 10 switched on until the predefined dosing time has expired. After the pre-metering, the rinsing tanks 2a, 2b, 2c are filled and brought approximately to the required detergent concentration.
Anschließend schaltet die Steuer- und Regeleinrichtung 13 auf die Spülphase 32 um. Dabei überwacht die Über¬ wachungseinrichtung 15 die Reinigungsmittelkonzentra¬ tion ständig und hält diese mittels Zweipunktregelung konstant. Während der Regelung wird das von der Meßsonde 12 ausgehende Signal in der Überwachungseinrichtung 15 mit dem Sollwert A aus dem Sollwertgeber 20a verglichen und in Abhängigkeit von dem Vergleichsergebnis die Do- siereinrichtung 10 ein- oder ausgeschaltet. Die Spül¬ phase wird durch Ausschalten der Geschirr-Spülmaschine beendet. Hat jedoch die Dosierzeit die vorgegebene Ver¬ gleichszeit, das ist der von dem Vergleichszeitgeber 23 abgegebene Grenzwert, überschritten, so wird ein Warn¬ signal abgegeben und die Geschirrspülmaschine 1 abge¬ schaltet.The control and regulating device 13 then switches over to the rinsing phase 32. The monitoring device 15 continuously monitors the cleaning agent concentration and keeps it constant by means of two-point control. During the control, the signal emanating from the measuring probe 12 is compared in the monitoring device 15 with the setpoint A from the setpoint generator 20a, and the do- siereinrichtung 10 on or off. The dishwashing phase is ended by switching off the dishwasher. If, however, the dosing time has exceeded the predetermined comparison time, that is the limit value given by the comparison timer 23, a warning signal is given and the dishwasher 1 is switched off.
Nach einer Vielzahl von Spülvorgängen wird durch Drücken des Wahlschalters 18 eine Grundreinigung einge¬ leitet. Der Grundreinigungszyklus entspricht im wesent¬ lichen dem Normalzyklus. Durch das Drücken des Wahl¬ schalters 18 werden die Inhalte des Sollwertgebers 20b und des Meßbereichs-Voreinstellteils in die Überwa¬ chungseinrichtung 15, den Vordosierzeitgeber 21b, das Anzeigeteil 16 und den Meßwertverstärker 14 überführt. Wegen der hohen Reinigungsmittelkonzentration ist der im Vordosierzeitgeber 21b gespeicherte Wert, der der aufgrund des Sollwerts B aus dem Sollwertgeber 20b er¬ mittelten Vordosierzeit entspricht, entsprechend größer als der im Vordosierzeitgeber 21a gespeicherte Wert. Der beim Drücken des Wahlschalters 18 im Sollwertgeber 20b eingestellte ■ Sollwert B wird dem Anzeigeteil 16 zugeführt, das den Sollwert B anzeigt. Durch das Drücken wird auch das MeßbereichVoreinstellteil 19b betätigt, so daß der Meßwertverstärker 14, der das Sig¬ nal der Meßsonde 12 verstärkt und an dem Anzeigeteil 16 zur Anzeige bringt, auf einen höheren Meßbereich einge¬ stellt bzw. umgeschaltet wird. In dem Grundreinigungs- zyklus (bei 55'C Spülwassertemperatur) beträgt die ein¬ gestellte Reinigungsmittelkonzentration nämlich 15 - 35 g/1, vorzugsweise 15 g/1. Der eingestellte Meßbereich entspricht daher einer Reinigungsmittelkonzentration von 0 - 3& g/1. In der Grundreinigungs-Anlaufphase wird die Reinigungs¬ mittelkonzentration durch Reinigungsmitteizufuhr mit¬ tels der Dosiereinrichtung 10 auf einen wesentlich hö¬ heren Wert gebracht als in der normalen Anlaufphase.After a large number of rinsing processes, basic cleaning is initiated by pressing the selector switch 18. The basic cleaning cycle corresponds essentially to the normal cycle. By pressing the selector switch 18, the contents of the setpoint generator 20b and the measuring range presetting part are transferred to the monitoring device 15, the predosing timer 21b, the display part 16 and the measured value amplifier 14. Because of the high detergent concentration, the value stored in the pre-metering timer 21b, which corresponds to the pre-metering time determined on the basis of the target value B from the target value transmitter 20b, is correspondingly greater than the value stored in the pre-metering timer 21a. The set upon pressing the selection switch 18 in the reference value generator 20b ■ target value B is supplied to the display part 16 indicating the target value B. The measuring range presetting part 19b is also actuated by pressing, so that the measuring value amplifier 14, which amplifies the signal of the measuring probe 12 and displays it on the display part 16, is set or switched over to a higher measuring range. In the basic cleaning cycle (at 55 ° C rinse water temperature), the cleaning agent concentration set is namely 15-35 g / 1, preferably 15 g / 1. The set measuring range therefore corresponds to a cleaning agent concentration of 0 - 3 & g / 1. In the basic cleaning start-up phase, the detergent concentration is brought to a much higher value by supplying detergent by means of the metering device 10 than in the normal start-up phase.
Auf die Grundreinigungs-Anlaufphase, die der Anlauf- phase entspricht, folgt die Grundreinigungs-Spülphase, die der Spülphaεe entspricht. Der Sollwert B aus dem Sollwertgeber 20b, der der Überwachungseinrichtung 15 zugeführt ist, wird für eine Zwei-Punkt-Regelung auf hohem Niveau herangezogen.Die Konstanthaltung der Rei¬ nigungsmittelkonzentration erfolgt in der Grundreini¬ gungs-Spülphase also wie in der Spülphase. Im Gegensatz zu dem Normalzyklus ist beim Grundreinigungszyklus aber der Dosierzeitbegrenzer 22 immer abgeschaltet, d.h. auch in der Spülphase.The basic cleaning start-up phase, which corresponds to the start-up phase, is followed by the basic cleaning-rinsing phase, which corresponds to the rinsing phase. The setpoint B from the setpoint generator 20b, which is fed to the monitoring device 15, is used for two-point control at a high level. The cleaning agent concentration is kept constant in the basic cleaning rinsing phase, as in the rinsing phase. In contrast to the normal cycle, the dosing time limiter 22 is always switched off in the basic cleaning cycle, i.e. also in the rinsing phase.
Nach dem Ende des Normalzyklus bzw. des Grundreini¬ gungszyklus wird die Frischwasserzufuhr über die Frisch¬ wasser-Klarspülung 5 ausgeschaltet und sämtliche Spül¬ tanks 2a,2b,2c werden entleert. After the end of the normal cycle or the basic cleaning cycle, the fresh water supply via the fresh water rinse 5 is switched off and all the rinsing tanks 2a, 2b, 2c are emptied.
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP92919612A EP0605507B1 (en) | 1991-09-27 | 1992-09-18 | Process and assembly for controlling and regulating the detergent supply to a dishwasher |
| DE59206716T DE59206716D1 (en) | 1991-09-27 | 1992-09-18 | Method and device for controlling and regulating the detergent supply to a dishwasher |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4132306.8 | 1991-09-27 | ||
| DE4132306A DE4132306A1 (en) | 1991-09-27 | 1991-09-27 | METHOD FOR CONTROLLING AND REGULATING THE DETERGENT SUPPLY OF A DISHWASHER |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1993005696A1 true WO1993005696A1 (en) | 1993-04-01 |
Family
ID=6441682
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP1992/002160 Ceased WO1993005696A1 (en) | 1991-09-27 | 1992-09-18 | Process for controlling and regulating the detergent supply to a dish-washer |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0605507B1 (en) |
| AT (1) | ATE139891T1 (en) |
| DE (2) | DE4132306A1 (en) |
| DK (1) | DK0605507T3 (en) |
| ES (1) | ES2088592T3 (en) |
| WO (1) | WO1993005696A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995014424A3 (en) * | 1993-11-20 | 1995-06-29 | Diversey Corp | Machine dishwashing process |
| WO1998026704A1 (en) * | 1996-12-18 | 1998-06-25 | Lang Apparatebau Gmbh | Dosing method for adding detergent to a dishwashing machine |
| US8092613B2 (en) | 2002-05-31 | 2012-01-10 | Ecolab Usa Inc. | Methods and compositions for the removal of starch |
| US8758520B2 (en) | 2011-05-20 | 2014-06-24 | Ecolab Usa Inc. | Acid formulations for use in a system for warewashing |
| US9139800B2 (en) | 2011-12-13 | 2015-09-22 | Ecolab Usa Inc. | Concentrated warewashing compositions and methods |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3490467A (en) * | 1966-07-11 | 1970-01-20 | Intercontinental Chem Corp | Method of monitoring and maintaining concentration of depletable work solutions |
| US4076146A (en) * | 1976-03-03 | 1978-02-28 | Gibson Chemicals International Pty. Limited | Dishwashers and detergent dispensers |
| US4733798A (en) * | 1986-02-05 | 1988-03-29 | Ecolab Inc. | Method and apparatus for controlling the concentration of a chemical solution |
| CH665547A5 (en) * | 1984-11-22 | 1988-05-31 | Electrolux Ag | Automatic dish-washer with at least three programs - has additional washing parameter selection buttons for increased flexibility |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3938755A1 (en) * | 1989-11-23 | 1991-05-29 | Henkel Kgaa | METHOD FOR CONTINUOUS MACHINE CLEANING OF CLEANING UTENSILS |
-
1991
- 1991-09-27 DE DE4132306A patent/DE4132306A1/en not_active Ceased
-
1992
- 1992-09-18 WO PCT/EP1992/002160 patent/WO1993005696A1/en not_active Ceased
- 1992-09-18 DE DE59206716T patent/DE59206716D1/en not_active Expired - Fee Related
- 1992-09-18 EP EP92919612A patent/EP0605507B1/en not_active Revoked
- 1992-09-18 ES ES92919612T patent/ES2088592T3/en not_active Expired - Lifetime
- 1992-09-18 DK DK92919612.9T patent/DK0605507T3/en active
- 1992-09-18 AT AT92919612T patent/ATE139891T1/en not_active IP Right Cessation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3490467A (en) * | 1966-07-11 | 1970-01-20 | Intercontinental Chem Corp | Method of monitoring and maintaining concentration of depletable work solutions |
| US4076146A (en) * | 1976-03-03 | 1978-02-28 | Gibson Chemicals International Pty. Limited | Dishwashers and detergent dispensers |
| CH665547A5 (en) * | 1984-11-22 | 1988-05-31 | Electrolux Ag | Automatic dish-washer with at least three programs - has additional washing parameter selection buttons for increased flexibility |
| US4733798A (en) * | 1986-02-05 | 1988-03-29 | Ecolab Inc. | Method and apparatus for controlling the concentration of a chemical solution |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995014424A3 (en) * | 1993-11-20 | 1995-06-29 | Diversey Corp | Machine dishwashing process |
| WO1998026704A1 (en) * | 1996-12-18 | 1998-06-25 | Lang Apparatebau Gmbh | Dosing method for adding detergent to a dishwashing machine |
| US8092613B2 (en) | 2002-05-31 | 2012-01-10 | Ecolab Usa Inc. | Methods and compositions for the removal of starch |
| US8709167B2 (en) | 2002-05-31 | 2014-04-29 | Ecolab Usa Inc. | Methods and compositions for the removal of starch |
| US8882932B2 (en) | 2002-05-31 | 2014-11-11 | Ecolab Usa Inc. | Methods and compositions for the removal of starch |
| US8758520B2 (en) | 2011-05-20 | 2014-06-24 | Ecolab Usa Inc. | Acid formulations for use in a system for warewashing |
| US9481857B2 (en) | 2011-05-20 | 2016-11-01 | Ecolab Usa Inc. | Acid formulations for use in a system for warewashing |
| US9139800B2 (en) | 2011-12-13 | 2015-09-22 | Ecolab Usa Inc. | Concentrated warewashing compositions and methods |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0605507B1 (en) | 1996-07-03 |
| EP0605507A1 (en) | 1994-07-13 |
| ATE139891T1 (en) | 1996-07-15 |
| ES2088592T3 (en) | 1996-08-16 |
| DE59206716D1 (en) | 1996-08-08 |
| DE4132306A1 (en) | 1993-04-08 |
| DK0605507T3 (en) | 1996-11-04 |
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