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EP1392807A1 - Cleaning method for removing starch - Google Patents

Cleaning method for removing starch

Info

Publication number
EP1392807A1
EP1392807A1 EP02743135A EP02743135A EP1392807A1 EP 1392807 A1 EP1392807 A1 EP 1392807A1 EP 02743135 A EP02743135 A EP 02743135A EP 02743135 A EP02743135 A EP 02743135A EP 1392807 A1 EP1392807 A1 EP 1392807A1
Authority
EP
European Patent Office
Prior art keywords
acid
cleaning
alkaline
acidic
cleaning step
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.)
Granted
Application number
EP02743135A
Other languages
German (de)
French (fr)
Other versions
EP1392807B1 (en
Inventor
Werner Strothoff
Helmut Maier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ecolab Inc
Original Assignee
Ecolab Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ecolab Inc filed Critical Ecolab Inc
Publication of EP1392807A1 publication Critical patent/EP1392807A1/en
Application granted granted Critical
Publication of EP1392807B1 publication Critical patent/EP1392807B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/02—Inorganic compounds
    • C11D7/04—Water-soluble compounds
    • C11D7/08—Acids
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/02—Inorganic compounds
    • C11D7/04—Water-soluble compounds
    • C11D7/06—Hydroxides
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/22—Organic compounds
    • C11D7/26—Organic compounds containing oxygen
    • C11D7/265—Carboxylic acids or salts thereof
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/22—Organic compounds
    • C11D7/34—Organic compounds containing sulfur
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/22—Organic compounds
    • C11D7/36—Organic compounds containing phosphorus
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
    • C11D2111/10—Objects to be cleaned
    • C11D2111/14—Hard surfaces
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
    • C11D2111/40—Specific cleaning or washing processes
    • C11D2111/44—Multi-step processes

Definitions

  • the invention relates to a cleaning method comprising an alkaline and an acidic cleaning step and one or more further alkaline and / or acidic cleaning steps, in particular for machine dishwashing in commercial dishwashers, in which starch deposits in particular can be removed in an excellent manner.
  • washing machines usually contain several tanks arranged one behind the other, from which rinsing or washing liquor is sprayed against the washing goods passing through the machine.
  • the tanks are generally placed in a cascade, with the washing or washing liquor passing through the tanks one after the other from the wash goods outlet end to the wash goods inlet end.
  • Fresh water is usually supplied to the machines at the outlet end.
  • the required amount of cleaning agent is dosed in at least one wash tank, also called a metering tank.
  • the detergent is usually added automatically as a function of the conductivity or the pH of the wash liquor or, if appropriate, also by means of a time-controlled or cycle-controlled metering pump. It may also be possible for separate components to be metered in separately.
  • a lye-based solution based on an aqueous alkali hydroxide solution may be introduced.
  • One or more additives can then be added to this basic solution as required.
  • the dosage of these additives is usually proportional to the addition of the base lye or time-controlled.
  • the additives can also be metered as a function of the cycle of the chain conveying the laundry through the machine.
  • metering of additives or increasing the additive concentration on the basis of the detection of the proportion of additive in the base liquor is also possible via sensory detection of a tracer contained in the additive.
  • the cleaning agents used in practice often do not prevent starch deposits that adhere to the items to be washed as part of the usual mechanical cleaning in a cleaning machine and do not remove existing starch deposits.
  • the dishes that have starch deposits are therefore subjected to a so-called basic cleaning at certain time intervals.
  • a basic cleaning is in the rinse or. Wash liquor set a significantly higher concentration of detergent compared to normal rinsing processes.
  • Another alternative is to spray a highly concentrated alkaline detergent onto the dishes as part of a normal dishwashing cycle.
  • DE-AS 12 85 087 Also known from DE-AS 12 85 087 is a method for machine dishwashing, in which an alkaline detergent is dosed in the main wash cycle and an enzyme-containing, in particular amylase-containing, rinse aid in the post-rinse and optionally pre-rinse cycle into the dishwasher. This is done in order to reduce the starch formed on the dishes in the rinse and possibly pre-wash cycle.
  • a low-alkaline cleaner in particular based on phosphate or nitrilotriacetic acid or its salts (NTA)
  • NTA nitrilotriacetic acid or its salts
  • an enzyme preferably carbohydrate-degrading enzyme, containing, in particular amylase-containing, cleaning enhancer
  • a low-alkaline cleaner in the usual concentration in conjunction with an enzyme-containing cleaning booster leads to excellent removal and inhibition of the starch build-up on the dishes, even with the short contact times of 10 to 180 seconds that are customary in commercial dishwashers.
  • the present invention relates to a cleaning method comprising an alkaline and an acidic cleaning step and one or more further alkaline and / or acidic cleaning steps, in particular for machine dishwashing in commercial dishwashers.
  • WO 98/30673 a tableware cleaning method is already known, in which a first and a second cleaning agent are used and one of the cleaning agents mentioned has an acidic pH value and the other has an alkaline pH value, before, between and after use the detergent mentioned is rinsed with water.
  • This method should be used in a preferred manner in order to achieve rapid disinfection of the dishes.
  • the present invention differs significantly from this known method. While WO 98/30673 speaks of an alkaline and an acidic cleaning step, the present invention is based on a method in which two cleaning steps take place in a uniform pH range, which is in the acidic or alkaline pH range, and at least one third cleaning step opposite pH takes place.
  • an acidic cleaning step follows at least one alkaline cleaning step and an alkaline cleaning step follows this acidic cleaning step, with the proviso that a total of at least three and particularly preferably no more than eight cleaning steps are contained.
  • the first of the cleaning steps mentioned is an alkaline cleaning step.
  • the surface to be cleaned is brought into contact with one or more aqueous cleaning solutions which contain between 0.1 and 4% by weight of an alkali carrier, preferably a hydroxide selected from sodium -, Potassium hydroxide or mixtures thereof, it being particularly preferred if the pH above 9 is particularly preferred is over 10.
  • an alkali carrier preferably a hydroxide selected from sodium -, Potassium hydroxide or mixtures thereof, it being particularly preferred if the pH above 9 is particularly preferred is over 10.
  • the alkalinity is not required to be higher than 13.
  • alkali carriers in addition to or instead of hydroxides selected from sodium and potassium hydroxide, examples include alkali silicates, ethanolamines such as triethanolamine, diethanolamine and monoethanolamine, and alkali carbonates alkali carriers, preferably a hydroxide selected from sodium and potassium hydroxide.
  • alkali silicates such as triethanolamine, diethanolamine and monoethanolamine
  • alkali carbonates alkali carriers preferably a hydroxide selected from sodium and potassium hydroxide.
  • other alkali carriers can also be used, since it is primarily a question of raising the pH.
  • the surface to be cleaned is brought into contact with one or more aqueous cleaning solutions which are between 0.1 and 10% by weight, particularly preferably between 0.1 and Contain 5 wt .-% of one or more acids, it being preferred if the pH is below 5, very particularly preferably below 2, and / or are particularly preferably selected from the mineral and / or organic acids and very particularly are preferably sulfuric acid, nitric acid, hydrochloric acid, phosphoric acid, formic acid, acetic acid, glycolic acid, citric acid, maleic acid, lactic acid, gluconic acid, alkylsulfonic acid, amidosulfonic acid, succinic acid, glutaric acid, adipic acid, phosphonic acids, polyacrylic acids or mixtures thereof.
  • aqueous cleaning solutions which are between 0.1 and 10% by weight, particularly preferably between 0.1 and Contain 5 wt .-% of one or more acids, it being preferred if the pH is below 5, very particularly preferably below 2, and / or are
  • the acid mentioned is a component with complexing properties.
  • the surface to be cleaned is preferably brought into contact with one or more aqueous cleaning solutions which contain at least one corrosion inhibitor and / or a conventional complexing agent, particularly preferably selected from the phosphonic acids, in particular dioctylphosphonic acid.
  • the temperature of the cleaning solutions mentioned is between 35 and 80 Ā° C.
  • the surface to be cleaned is treated with a preferably acidic or neutral aqueous solution containing at least one rinse aid component.
  • the time required for the mentioned cleaning steps of the method according to the invention is preferably between 10 seconds and 30 minutes. It is particularly important to consider whether the method according to the invention is used in a household or commercial machine. Because of the requirements specified in practice, the time required per cleaning step in commercial machines is preferably between 10 seconds and 10 minutes. In contrast, values of 1 to 30 minutes per cleaning step are common for household machines.
  • the process according to the invention is very particularly preferred to use for removing starch from surfaces. It has also been shown that the process according to the invention is particularly effective in removing mineral impurities.
  • the process according to the invention can be used advantageously in particular in the case of residues, such as coffee or tea residues, which have proportions of mineral impurities.
  • the method according to the invention is preferably used for cleaning dishes in the household and particularly preferably in the commercial sector.
  • the earlier alkaline step in the process sequence has a lower pH than the later alkaline step in the process sequence. This is advantageous in order to keep the consumption as low as possible during an acidic step in the meantime.
  • the method according to the invention can be carried out with multi-tank or single-tank machines.
  • the acidic component is preferably dosed via the rinse arm.
  • the main cleaning bath is preferably alkaline. Such an embodiment of the method according to the invention is also preferred when using household machines.
  • Another object of the present invention is a commercial dishwasher which contains a plurality of tanks which are cascaded together in a known manner and from which washing or washing liquor is sprayed against the dishes in order to then run back into the tanks, the tanks, the are provided for one or more acidic cleaning steps due to a method according to the invention, consist of acid-resistant material and / or are lined with acid-resistant material.
  • the present invention also relates to a one-tank washing machine, for example a domestic dishwasher, which is suitable for a method according to the invention and which consists of acid-resistant material and / or is lined with acid-resistant material at those points which come into contact with acidic cleaning solutions as a result of the method according to the invention is, especially if it is not foreseeable that these places will come into contact with alkaline agents later.
  • a one-tank washing machine for example a domestic dishwasher
  • the cleaning and spraying solutions were made available on the basis of softened water.
  • the cleaning temperature in the Krefft Ā® single-tank dishwasher was 60 Ā° C.
  • the cleaning results were rated depending on the cleaning success with numbers from 1 (no cleaning success recognizable) to 10 (complete removal of the impurities).

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wood Science & Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Detergent Compositions (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)

Abstract

Disclosed is a cleaning method comprising an alkaline and an acidic cleaning step in addition to one or several other alkaline and/or acidic cleaning steps, especially for washing dishes in commercially available dish washers, wherein primarily starch deposits are removed in an excellent manner.

Description

ā€žReinigungsverfahren zur StƤrkeentfernung"Ā "Cleaning process for starch removal"
Die Erfindung richtet sich auf ein Reinigungsverfahren, umfassend einen alkalischen und einen sauren Reinigungsschritt sowie einen oder mehrere weitere alkalische und/oder saure Reinigungsschritte, insbesondere zur maschinellen Geschirreinigung in gewerblichen GeschirrspĆ¼lmaschinen, bei dem vor allem StƤrkeablagerungen in hervorragender Weise entfernbar sind.The invention relates to a cleaning method comprising an alkaline and an acidic cleaning step and one or more further alkaline and / or acidic cleaning steps, in particular for machine dishwashing in commercial dishwashers, in which starch deposits in particular can be removed in an excellent manner.
Gewerbliche Reinigungsmaschinen enthalten je nach Typ und Einsatzgebiet Ć¼blicherweise mehrere hintereinander angeordnete Tanks, aus denen SpĆ¼l- bzw. Waschflotte gegen das die Maschine durchlaufende Waschgut gesprĆ¼ht wird. Die Tanks sind in der Regel kaskadenartig aneinandergesetzt, wobei die SpĆ¼l- bzw. Waschflotte die Tanks nacheinander vom Waschgut-AuslaƟende zum Waschgut- EinlaƟende hin durchlƤuft. Am AuslaƟende wird den Maschinen in der Regel Frischwasser zugefĆ¼hrt. Die benƶtigte Menge an Reinigungsmittel wird in zumindest einen auch als Dosiertank bezeichneten Waschtank dosiert. Ɯblicherweise erfolgt die Zudosierung von Reinigungsmittel automatisch in AbhƤngigkeit von der LeitfƤhigkeit oder dem pH-Wert der Waschflotte oder gegebenenfalls auch mittels einer zeit- oder taktgesteuerten Dosierpumpe. Es kann auch mƶglich sein, daƟ eine separate Dosierung mehrerer Komponenten stattfindet. Beispielsweise kommt es vor, daƟ eine Laugen-Basis-Lƶsung auf Basis einer wƤƟrigen Alkalihydroxid-Lƶsung vorgelegt wird. Zu dieser Basis-Lƶsung kƶnnen dann je nach Bedarf ein oder mehrere Additive hinzugefĆ¼gt werden. Die Dosage dieser ZusƤtze erfolgt Ć¼blicherweise proportional zur Zugabe der Basis- Lauge oder zeitgesteuert. GewĆ¼nschtenfalls kann die Dosierung der Additive auch in AbhƤngigkeit des Taktes der die WaschgĆ¼ter durch die Maschine befƶrdernden Kette erfolgen. Weiterhin ist auch eine Dosierung von Additiven bzw. die Anhebung der Additiv-Konzentration aufgrund der Erkennung des Anteils an Additiv in der Basis-Lauge Ć¼ber sensorische Erfassung eines Tracers, der im Additiv enthalten ist, mƶglich. Mit den in der Praxis eingesetzten Reinigungsmitteln lassen sich bei Ć¼blicher Reinigerkonzentration StƤrkeablagerungen, die auf dem Waschgut anhaften, im Rahmen der Ć¼blichen maschinellen Reinigung in einer Reinigungsmaschine oftmals nicht verhindern und vorhandene StƤrkeablagerungen nicht entfernen.Depending on the type and area of application, commercial cleaning machines usually contain several tanks arranged one behind the other, from which rinsing or washing liquor is sprayed against the washing goods passing through the machine. The tanks are generally placed in a cascade, with the washing or washing liquor passing through the tanks one after the other from the wash goods outlet end to the wash goods inlet end. Fresh water is usually supplied to the machines at the outlet end. The required amount of cleaning agent is dosed in at least one wash tank, also called a metering tank. The detergent is usually added automatically as a function of the conductivity or the pH of the wash liquor or, if appropriate, also by means of a time-controlled or cycle-controlled metering pump. It may also be possible for separate components to be metered in separately. For example, a lye-based solution based on an aqueous alkali hydroxide solution may be introduced. One or more additives can then be added to this basic solution as required. The dosage of these additives is usually proportional to the addition of the base lye or time-controlled. If desired, the additives can also be metered as a function of the cycle of the chain conveying the laundry through the machine. Furthermore, metering of additives or increasing the additive concentration on the basis of the detection of the proportion of additive in the base liquor is also possible via sensory detection of a tracer contained in the additive. With the usual detergent concentration, the cleaning agents used in practice often do not prevent starch deposits that adhere to the items to be washed as part of the usual mechanical cleaning in a cleaning machine and do not remove existing starch deposits.
Im Bereich der Reinigung von Geschirr wird deshalb in gewissen zeitlichen AbstƤnden das StƤrkeablagerungen aufweisende Geschirr einer sogenannten Grundreinigung unterzogen. Bei einer solchen Grundreinigung wird in der SpĆ¼lbzw. Waschflotte eine gegenĆ¼ber normalen SpĆ¼lvorgƤngen deutlich erhƶhte Konzentration an Reinigungsmittel eingestellt. Eine andere Alternative besteht darin, im Rahmen eines Ć¼blichen GeschirrspĆ¼lreinigungszyklus auf das Geschirr ein hochkonzentriertes alkalisches Reinigungsmittel aufzusprĆ¼hen. Daneben besteht ferner die Mƶglichkeit, eine manuelle Grundreinigung durchzufĆ¼hren.In the area of cleaning dishes, the dishes that have starch deposits are therefore subjected to a so-called basic cleaning at certain time intervals. With such a basic cleaning is in the rinse or. Wash liquor set a significantly higher concentration of detergent compared to normal rinsing processes. Another alternative is to spray a highly concentrated alkaline detergent onto the dishes as part of a normal dishwashing cycle. There is also the option of performing a basic manual cleaning.
Aus der DE-OS 17 28 093 ist es fĆ¼r das Reinigen von Geschirr in Haushalts- GeschirrspĆ¼lmaschinen bekannt, zur Entfernung von StƤrkeablagerungen auf dem Geschirr dem SpĆ¼lwasser ein KlarspĆ¼lmittel zusammen mit Amylase zuzugeben. GewĆ¼nschtenfalls kann zusƤtzlich zu der Amylase auch Protease oder Lipase dem KlarspĆ¼lmittel zugegeben werden.From DE-OS 17 28 093 it is known for cleaning dishes in household dishwashers to add a rinse aid together with amylase to remove starch deposits on the dishes. If desired, protease or lipase can also be added to the rinse aid in addition to the amylase.
Ebenso ist aus der DE-AS 12 85 087 ein Verfahren zur maschinellen Geschirreinigung bekannt, bei welchem im HauptspĆ¼lgang ein alkalisches Reinigungsmittel und im NachspĆ¼l- und gegebenenfalls VorspĆ¼lgang ein enzymhaltiges, insbesondere amylasehaltiges, NachspĆ¼lmittel in die GeschirrspĆ¼lmaschine dosiert wird. Dies geschieht, um im NachspĆ¼l- und gegebenenfalls VorspĆ¼lgang auf dem Geschirr gebildete StƤrke abzubauen.Also known from DE-AS 12 85 087 is a method for machine dishwashing, in which an alkaline detergent is dosed in the main wash cycle and an enzyme-containing, in particular amylase-containing, rinse aid in the post-rinse and optionally pre-rinse cycle into the dishwasher. This is done in order to reduce the starch formed on the dishes in the rinse and possibly pre-wash cycle.
Aus der WO 94/27488 ist ein Verfahren bekannt, bei dem als Reinigungsmittel ein niederalkalischer Reiniger, insbesondere auf Basis Phosphat oder NitrilotriessigsƤure oder deren Salze (NTA), und als weiterer Wirkstoff ein Enzym, vorzugsweise kohlenhydratabbauendes Enzym, enthaltender, insbesondere amylasehaltiger, ReinigungsverstƤrker eindosiert werden. Dabei zeigte sich, daƟ ein niederalkalischer Reiniger in Ć¼blicher Konzentration in Verbindung mit einem enzymhaltigen ReinigungsverstƤrker auch bei den in gewerblichen GeschirrspĆ¼lmaschinen Ć¼blichen kurzen Kontaktzeiten von 10 bis 180 Sekunden zu einer ausgezeichneten Entfernung und Inhibierung des StƤrkeaufbaus auf dem Geschirr fĆ¼hrt.From WO 94/27488 a method is known in which a low-alkaline cleaner, in particular based on phosphate or nitrilotriacetic acid or its salts (NTA), and as an additional active ingredient an enzyme, preferably carbohydrate-degrading enzyme, containing, in particular amylase-containing, cleaning enhancer are metered in as cleaning agent become. It was found that a low-alkaline cleaner in the usual concentration in conjunction with an enzyme-containing cleaning booster leads to excellent removal and inhibition of the starch build-up on the dishes, even with the short contact times of 10 to 180 seconds that are customary in commercial dishwashers.
DemgegenĆ¼ber war Aufgabe der vorliegenden Erfindung, eine Lƶsung zu schaffen, die beim Reinigen in gewerblichen Reinigungsmaschinen oder auch in Maschinen des Haushaltsbereiches die Bildung eines StƤrkebelages auf dem Waschgut nachhaltig unterbindet und/oder existierende StƤrkebelƤge abbaut, bzw. entfernt und nicht notwendigerweise den Einsatz von Enzymen, Bleichmitteln, oder Ć¼beraus hoher AlkalitƤt erfordert.In contrast, it was an object of the present invention to provide a solution which, during cleaning in commercial cleaning machines or in household machines, permanently prevents the formation of a starch deposit on the laundry and / or degrades or removes existing starch deposits and does not necessarily remove the use of enzymes , Bleach, or extremely high alkalinity required.
Dementsprechend ist Gegenstand der vorliegenden Erfindung ein Reinigungsverfahren umfassend einen alkalischen und einen sauren Reinigungsschritt sowie einen oder mehrere weitere alkalische und/oder saure Reinigungsschritte, insbesondere zur maschinellen Geschirr-Reinigung in gewerblichen GeschirrspĆ¼lmaschinen.Accordingly, the present invention relates to a cleaning method comprising an alkaline and an acidic cleaning step and one or more further alkaline and / or acidic cleaning steps, in particular for machine dishwashing in commercial dishwashers.
Aus der WO 98/30673 ist bereits ein Geschirr-Reinigungsverfahren bekannt, bei dem ein erstes und ein zweites Reinigungsmittel verwendet werden und das eine der genannten Reinigungsmittel einen sauren und das andere einen alkalischen pH-Wert aufweist, wobei vor, zwischen und nach der Anwendung der genannten Reinigungsmittel jeweils mit Wasser gespĆ¼lt wird. Dieses genannte Verfahren soll in bevorzugter Weise eingesetzt werden, um eine schnelle Desinfektion des Geschirrs zu erreichen. Von diesem bekannten Verfahren unterscheidet sich die vorliegende Erfindung deutlich. WƤhrend die WO 98/30673 von einem alkalischen und einem sauren Reinigungsschritt spricht, beruht die vorliegende Erfindung auf einem Verfahren, bei dem zwei Reinigungsschritte in einem einheitlichen pH- Bereich erfolgen, der im sauren oder alkalischen pH-Bereich liegt und mindestens ein dritter Reinigungsschritt bei entgegengesetztem pH-Wert erfolgt. Dieses in der WO 98/30673 in keiner Weise beschriebene oder erkannte Prinzip fĆ¼hrt zu unerwarteten Ergebnissen bei der Reinigung, insbesondere bei der Entfernung von StƤrkeablagerungen. Der beobachtete Effekt, der in den Beispielen dieser Anmeldung verdeutlicht ist, geht Ć¼ber die Wirkung hinaus, die ein Fachmann bei HinzufĆ¼gen eines weiteren Reinigungsschrittes erwartet hƤtte.From WO 98/30673 a tableware cleaning method is already known, in which a first and a second cleaning agent are used and one of the cleaning agents mentioned has an acidic pH value and the other has an alkaline pH value, before, between and after use the detergent mentioned is rinsed with water. This method should be used in a preferred manner in order to achieve rapid disinfection of the dishes. The present invention differs significantly from this known method. While WO 98/30673 speaks of an alkaline and an acidic cleaning step, the present invention is based on a method in which two cleaning steps take place in a uniform pH range, which is in the acidic or alkaline pH range, and at least one third cleaning step opposite pH takes place. This in the Principle which is not described or recognized in any way by WO 98/30673 leads to unexpected results in cleaning, in particular in the removal of starch deposits. The observed effect, which is illustrated in the examples of this application, goes beyond the effect which a person skilled in the art would have expected if a further cleaning step were added.
Abgesehen davon wurde in der WO 98/30673 der pH-Wert-Wechsel in keiner Weise im Zusammenhang mit der Verbesserung der Entfernung von StƤrkeablagerungen gesehen. Somit geht die Aufgabe, die sich die vorliegende Erfindung stellt, in eine ganz andere Richtung und kommt auch zu einem anderen Ergebnis. WƤhrend ein Verfahren, dem zwei Reinigungsschritte mit entgegengesetztem pH-Wert zugrunde liegen zu mittelmƤƟigen Erfolgen bei der Entfernung von StƤrkeablagerungen fĆ¼hrt, liefert das erfindungsgemƤƟe Verfahren deutlich bessere Ergebnisse. Dabei ist es bevorzugt, wenn bei dem erfindungsgemƤƟen Verfahren auf wenigstens einen alkalischen Reinigungsschritt ein saurer Reinigungsschritt und auf diesen sauren Reinigungsschritt ein alkalischer Reinigungsschritt folgt mit der MaƟgabe, daƟ insgesamt wenigstens drei und besonders bevorzugt nicht mehr als acht Reinigungsschritte enthalten sind. Im Rahmen des erfindungsgemƤƟen Verfahrens ist es besonders bevorzugt, wenn der erste der genannten Reinigungsschritte ein alkalischer Reinigungsschritt ist.Apart from that, in WO 98/30673 the change in pH was in no way seen in connection with the improvement in the removal of starch deposits. Thus, the task facing the present invention goes in a completely different direction and also comes to a different result. While a process based on two cleaning steps with opposite pH values leads to moderate success in removing starch deposits, the process according to the invention delivers significantly better results. It is preferred if, in the method according to the invention, an acidic cleaning step follows at least one alkaline cleaning step and an alkaline cleaning step follows this acidic cleaning step, with the proviso that a total of at least three and particularly preferably no more than eight cleaning steps are contained. In the context of the method according to the invention, it is particularly preferred if the first of the cleaning steps mentioned is an alkaline cleaning step.
FĆ¼r das erfindungsgemƤƟe Verfahren ist es besonders bevorzugt, daƟ im alkalischen Schritt und/oder im sauren Schritt nicht mit den Konzentraten gereinigt wird, sondern mit verdĆ¼nnten Lƶsungen.For the process according to the invention, it is particularly preferred that in the alkaline step and / or in the acidic step cleaning is not carried out with the concentrates but with dilute solutions.
So ist bei dem erfindungsgemƤƟen Verfahren bevorzugt, daƟ bei dem oder den alkalischen Reinigungsschritten die zu reinigende OberflƤche mit einer oder mehreren wƤƟrigen Reinigungslƶsungen in Kontakt gebracht wird, die zwischen 0,1 und 4 Gew.-% eines AlkalitrƤgers, vorzugsweise eines Hydroxids ausgewƤhlt aus Natrium-, Kaliumhydroxid oder Gemischen derselben enthalten, wobei es besonders bevorzugt ist, wenn der pH-Wert Ć¼ber 9 ganz besonders bevorzugt Ć¼ber 10 liegt. Hingegen ist es nicht erforderlich, daƟ die AlkalitƤt hƶher als 13 betrƤgt.It is preferred in the process according to the invention that in the alkaline cleaning step or steps the surface to be cleaned is brought into contact with one or more aqueous cleaning solutions which contain between 0.1 and 4% by weight of an alkali carrier, preferably a hydroxide selected from sodium -, Potassium hydroxide or mixtures thereof, it being particularly preferred if the pH above 9 is particularly preferred is over 10. However, the alkalinity is not required to be higher than 13.
Als weitere bevorzugte AlkalitrƤger, zusƤtzlich zu oder anstelle von Hydroxiden, ausgewƤhlt aus Natrium- und Kaliumhydroxid seien beispielhaft Alkalisilikate, Ethanolamine, wie Triethanolamin, Diethanolamin und Monoethanolamin, sowie Alkalicarbonate AlkalitrƤgers, vorzugsweise eines Hydroxids ausgewƤhlt aus Natrium-, Kaliumhydroxid genannt. NatĆ¼rlich kƶnnen auch andere AlkalitrƤger, eingesetzt werden, da es in erster Linie auf die Anhebung des pH-Werts ankommt.As further preferred alkali carriers, in addition to or instead of hydroxides selected from sodium and potassium hydroxide, examples include alkali silicates, ethanolamines such as triethanolamine, diethanolamine and monoethanolamine, and alkali carbonates alkali carriers, preferably a hydroxide selected from sodium and potassium hydroxide. Of course, other alkali carriers can also be used, since it is primarily a question of raising the pH.
Desgleichen ist es bei dem erfmdungsgemƤƟen Verfahren bevorzugt, daƟ bei dem oder den sauren Reinigungsschritten die zu reinigende OberflƤche mit einer oder mehreren wƤƟrigen Reinigungslƶsungen in Kontakt gebracht wird, die zwischen 0,1 und 10 Gew.-%, besonders bevorzugt zwischen 0,1 und 5 Gew.-% einer oder mehrerer SƤuren enthalten, wobei es bevorzugt ist, wenn der pH-Wert unter 5, ganz besonders bevorzugt unter 2 liegt, und/oder die besonders bevorzugt ausgewƤhlt sind aus den mineralischen und/oder organischen SƤuren und ganz besonders bevorzugt SchwefelsƤure, SalpetersƤure, SalzsƤure, PhosphorsƤure, AmeisensƤure, EssigsƤure, GlykolsƤure, ZitronensƤure, MaleinsƤure, MilchsƤure, GluconsƤure, AlkylsulfonsƤure, AmidosulfonsƤure, SuccinsƤure, GlutarsƤure, AdipinsƤure, PhosphonsƤuren, PolyacrylsƤuren oder Mischungen derselben sind.Likewise, it is preferred in the process according to the invention that, in the acidic cleaning step or steps, the surface to be cleaned is brought into contact with one or more aqueous cleaning solutions which are between 0.1 and 10% by weight, particularly preferably between 0.1 and Contain 5 wt .-% of one or more acids, it being preferred if the pH is below 5, very particularly preferably below 2, and / or are particularly preferably selected from the mineral and / or organic acids and very particularly are preferably sulfuric acid, nitric acid, hydrochloric acid, phosphoric acid, formic acid, acetic acid, glycolic acid, citric acid, maleic acid, lactic acid, gluconic acid, alkylsulfonic acid, amidosulfonic acid, succinic acid, glutaric acid, adipic acid, phosphonic acids, polyacrylic acids or mixtures thereof.
Dabei ist es besonders bevorzugt, wenn die genannte SƤure eine Komponente mit komplexierenden Eigenschaften ist.It is particularly preferred if the acid mentioned is a component with complexing properties.
Vorzugsweise wird bei dem oder den sauren Reinigungsschritten des erfindungsgemƤƟen Verfahrens die zu reinigende OberflƤche mit einer oder mehreren wƤƟrigen Reinigungslƶsungen in Kontakt gebracht, die wenigstens einen Korrosionsinhibitor und/oder einen Ć¼blichen Komplexbildner, besonders bevorzugt ausgewƤhlt aus den PhosphonsƤuren, insbesondere DioctylphosphonsƤure, enthalten. ln einer weiteren bevorzugten AusfĆ¼hrungsform des erfindungsgemƤƟen Verfahrens liegt die Temperatur der genannten Reinigungslƶsungen zwischen 35 und 80 Ā°C. AuƟerdem ist es bevorzugt, daƟ nach dem letzten Reinigungsschritt die zu reinigende OberflƤche mit einer vorzugsweise sauer oder neutral eingestellten wƤƟrigen Lƶsung, enthaltend wenigstens eine KlarspĆ¼lerkomponente, behandelt wird.In the acidic cleaning step or steps of the process according to the invention, the surface to be cleaned is preferably brought into contact with one or more aqueous cleaning solutions which contain at least one corrosion inhibitor and / or a conventional complexing agent, particularly preferably selected from the phosphonic acids, in particular dioctylphosphonic acid. In a further preferred embodiment of the method according to the invention, the temperature of the cleaning solutions mentioned is between 35 and 80 Ā° C. In addition, it is preferred that after the last cleaning step, the surface to be cleaned is treated with a preferably acidic or neutral aqueous solution containing at least one rinse aid component.
Vorzugsweise betrƤgt der Zeitaufwand fĆ¼r die genannten Reinigungsschritte des erfindungsgemƤƟen Verfahrens jeweils zwischen 10 Sekunden und 30 Minuten. Dabei ist insbesondere zu berĆ¼cksichtigen, ob das erfindungsgemƤƟe Verfahren in einer Haushalts- oder gewerblichen Maschine angewandt wird. Aufgrund der in der Praxis vorgegebenen Anforderungen ist der Zeitaufwand pro Reinigungsschritt bei gewerblichen Maschinen bevorzugt zwischen 10 Sekunden und 10 Minuten. Bei Haushaltsmaschinen sind hingegen Werte von 1 bis 30 Minuten pro Reinigungsschritt Ć¼blich.The time required for the mentioned cleaning steps of the method according to the invention is preferably between 10 seconds and 30 minutes. It is particularly important to consider whether the method according to the invention is used in a household or commercial machine. Because of the requirements specified in practice, the time required per cleaning step in commercial machines is preferably between 10 seconds and 10 minutes. In contrast, values of 1 to 30 minutes per cleaning step are common for household machines.
Wie bereits mehrfach dargelegt, ist es ganz besonders bevorzugt, das erfindungsgemƤƟe Verfahren zur StƤrkeablƶsung von OberflƤchen zu verwenden. AuƟerdem hat es sich gezeigt, daƟ mit dem erfindungsgemƤƟen Verfahren die Entfernung mineralischer Verunreinigungen besonders gut gelingt. Insbesondere bei RĆ¼ckstƤnden, wie Kaffee- oder Tee-RĆ¼ckstƤnden, die Anteile an mineralischen Verunreinigungen besitzen, lƤƟt sich das erfindungsgemƤƟe Verfahren vorteilhaft anwenden. Weiterhin findet das erfindungsgemƤƟe Verfahren vorzugsweise bei der Reinigung von Geschirr im Haushalt und besonders bevorzugt im gewerblichen Bereich Anwendung.As has already been stated several times, it is very particularly preferred to use the process according to the invention for removing starch from surfaces. It has also been shown that the process according to the invention is particularly effective in removing mineral impurities. The process according to the invention can be used advantageously in particular in the case of residues, such as coffee or tea residues, which have proportions of mineral impurities. Furthermore, the method according to the invention is preferably used for cleaning dishes in the household and particularly preferably in the commercial sector.
Es sei weiterhin dargelegt, daƟ fĆ¼r den Fall, daƟ bei dem erfindungsgemƤƟen Verfahren mindestens zwei alkalische Schritte vorkommen, es besonders bevorzugt ist, daƟ der in der Verfahrensreihenfolge frĆ¼here alkalische Schritt einen niedrigeren pH-Wert aufweist, als der in der Verfahrensreihenfolge spƤtere alkalische Schritt. Dies ist von Vorteil, um die Zehrung bei einem zwischenzeitlich erfolgenden sauren Schritt mƶglichst gering zu halten. Das erfindungsgemƤƟe Verfahren kann mit Mehrtank- oder Eintank-Maschinen durchgefĆ¼hrt werden.It should also be stated that in the event that at least two alkaline steps occur in the process according to the invention, it is particularly preferred that the earlier alkaline step in the process sequence has a lower pH than the later alkaline step in the process sequence. This is advantageous in order to keep the consumption as low as possible during an acidic step in the meantime. The method according to the invention can be carried out with multi-tank or single-tank machines.
Bei Maschinen mit einem Tank wird die saure Komponente vorzugsweise Ć¼ber den KlarspĆ¼larm dosiert. Das Hauptreinigungsbad ist dabei bevorzugt alkalisch. Eine derartige AusfĆ¼hrungsform des erfindungsgemƤƟen Verfahrens ist auch beim Einsatz von Haushaltsmaschinen bevorzugt.In machines with a tank, the acidic component is preferably dosed via the rinse arm. The main cleaning bath is preferably alkaline. Such an embodiment of the method according to the invention is also preferred when using household machines.
Ein weiterer Gegenstand der vorliegenden Erfindung ist eine gewerbliche GeschirrspĆ¼lmaschine, die mehrere Tanks enthƤlt, die in bekannter Weise kaskadenartig aneinandergesetzt sind und aus denen SpĆ¼l- bzw. Waschflotte gegen das Geschirr gesprĆ¼ht wird, um anschlieƟend wieder in die Tanks abzulaufen, wobei die Tanks, die aufgrund eines erfindungsgemƤƟen Verfahrens fĆ¼r einen oder mehrere saure Reinigungsschritte vorgesehen sind, aus sƤureresistentem Material bestehen und/oder mit sƤureresistentem Material ausgekleidet sind.Another object of the present invention is a commercial dishwasher which contains a plurality of tanks which are cascaded together in a known manner and from which washing or washing liquor is sprayed against the dishes in order to then run back into the tanks, the tanks, the are provided for one or more acidic cleaning steps due to a method according to the invention, consist of acid-resistant material and / or are lined with acid-resistant material.
AuƟerdem ist Gegenstand der vorliegenden Erfindung eine Eintank- Waschmaschine, beispielsweise eine Haushalts-GeschirrspĆ¼lmaschine, die fĆ¼r ein erfindungsgemƤƟes Verfahren geeignet ist, und an den aufgrund des erfindungsgemƤƟen Verfahrens mit sauren Reinigungslƶsungen in BerĆ¼hrung kommenden Stellen aus sƤureresistentem Material besteht und/oder mit sƤureresistentem Material ausgekleidet ist, insbesondere dann, wenn nicht vorhersehbar ist, daƟ diese Stellen spƤter mit alkalischen Mitteln in Kontakt kommen. BeispieleThe present invention also relates to a one-tank washing machine, for example a domestic dishwasher, which is suitable for a method according to the invention and which consists of acid-resistant material and / or is lined with acid-resistant material at those points which come into contact with acidic cleaning solutions as a result of the method according to the invention is, especially if it is not foreseeable that these places will come into contact with alkaline agents later. Examples
Pro Versuch werden 10 neue, trockene Speiseteller bei Raumtemperatur gemƤƟ einer standardisierten Testmethode mit einer StƤrkeverschmutzung angeschmutzt. HierfĆ¼r wird eine etwa 6 %ige wƤƟrige MaisstƤrke enthaltende Zusammensetzung nach Aufkochen lassen auf 75 Ā°C abgekĆ¼hlt und davon je Teller ca. 4 ml mit Pinsel aufgetragen. Die so behandelten Teller lƤƟt man mindestens 3 Stunden stehen und lƤƟt die Teller anschlieƟend 16 Stunden bei ca. 100 Ā°C trocknen. Nach dem AbkĆ¼hlen der Teller wurden in einer KrefftĀ® Eintank GeschirrspĆ¼lmaschine nach folgendem Schema Vergleichsversuche durchgefĆ¼hrt. a) 1 Minute reinigen mit einer 0,3 Gew.-%igen wƤƟrigen Lƶsung eines Ć¼blichen gleichbleibenden alkalischen Reinigungsmittels (ca. 17 Gew.% Alkalihydroxid, 14 Gew.% Tripolyphosphat und 1 ,5 Gew.% Alkalihypochlorit sowie ca. 1 Gew.% Alkali-Silikat und Rest Wasser). b) FlƤchendeckendes EinsprĆ¼hen der Teller mit von Versuch zu Versuch andersartiger AnsprĆ¼hlƶsungen, deren Zusammensetzung in Tabelle 1 nƤher beschrieben ist. c) 30 Sekunden einwirken lassen der aufgetragenen AnsprĆ¼hlƶsung. d) 2 Minuten reinigen mit einer Lƶsung gemƤƟ a).For each experiment, 10 new, dry dinner plates are soiled with starch contamination at room temperature using a standardized test method. For this purpose, a composition containing about 6% aqueous corn starch is brought to a boil down to 75 Ā° C. and about 4 ml of it are applied to each plate with a brush. The plates treated in this way are left to stand for at least 3 hours and the plates are then left to dry at about 100 Ā° C. for 16 hours. After the plates had cooled, comparative tests were carried out in a Krefft Ā® one- tank dishwasher according to the following scheme. a) Clean for 1 minute with a 0.3% by weight aqueous solution of a common, constant alkaline cleaning agent (approx. 17% by weight alkali hydroxide, 14% by weight tripolyphosphate and 1.5% by weight alkali hypochlorite and approx. 1% by weight. % Alkali silicate and the rest water). b) Area-wide spraying of the plates with spray solutions of different types, the composition of which is described in more detail in Table 1. c) Allow the spray solution applied to act for 30 seconds. d) Clean for 2 minutes with a solution according to a).
Die Reinigungs- und AnsprĆ¼hlƶsungen wurden auf Basis von enthƤrtetem Wasser zur VerfĆ¼gung gestellt. Die Reinigungstemperatur in der KrefftĀ® Eintank- GeschirrspĆ¼lmaschine betrug 60 Ā°C.The cleaning and spraying solutions were made available on the basis of softened water. The cleaning temperature in the Krefft Ā® single-tank dishwasher was 60 Ā° C.
Es wurden zunƤchst 4 Versuche nach dem beschriebenen Schema durchgefĆ¼hrt, wobei die Zusammensetzung der Reinigungslƶsungen a) und d) beibehalten wurde und nur die AnsprĆ¼hlƶsung von Versuch zu Versuch verƤndert wurde.Initially, 4 tests were carried out according to the scheme described, the composition of the cleaning solutions a) and d) being retained and only the spraying solution being changed from test to test.
Die Reinigungsergebnisse wurden je nach Reinigungserfolg mit Zahlen von 1 (kein Reinigungserfolg erkennbar) bis 10 (vollstƤndige Entfernung der Verunreinigungen) bewertet.The cleaning results were rated depending on the cleaning success with numbers from 1 (no cleaning success recognizable) to 10 (complete removal of the impurities).
Die Ergebnisse der 4 Versuche sind der Tabelle 1 zu entnehmen. Tabelle 1:The results of the 4 tests are shown in Table 1. Table 1:
Reinigungsergebnisse in Versuchen gemƤƟ beschriebenem Schema, wobei nur die AnsprĆ¼hlƶsung von Versuch zu Versuch geƤndert wurdeCleaning results in tests according to the described scheme, whereby only the spray solution was changed from test to test
Wie aus Tabelle 1 ersichtlich, wurden die mit Abstand besten Reinigungsergebnisse in Versuch 3 erzielt. In Versuch 3 kam als AnsprĆ¼hlƶsung eine MethansulfonsƤurelƶsung zum Einsatz. Das Reinigungsprinzip bestand fĆ¼r diesen sehr vorteilhaften Fall also darin, daƟ zunƤchst alkalisch, dann sauer und danach wieder alkalisch gereinigt wurde.As can be seen from Table 1, by far the best cleaning results were achieved in Experiment 3. In experiment 3, a methanesulfonic acid solution was used as the spray solution. The cleaning principle for this very advantageous case was that alkaline cleaning was carried out first, then acidic and then alkaline again.
Weitere Untersuchungen zeigten, daƟ fĆ¼r die Reinigungsleistung der saure pH- Wert wesentlich ist und die Art der verwendeten SƤure von untergeordneter Bedeutung ist. So wird bei Einsatz von Ƥquivalenten Mengen von PhosphorsƤure in Versuch 3 im Austausch mit MethansulfonsƤure ein Ƥhnlich gutes Reinigungsergebnis erreicht, wie mit MethansulfonƤsure. Further investigations showed that the acidic pH value is essential for the cleaning performance and the type of acid used is of minor importance. Thus, when using equivalent amounts of phosphoric acid in experiment 3 in exchange with methanesulfonic acid, a cleaning result that is similar to that of methanesulfonic acid is achieved.

Claims

PatentansprĆ¼che claims
1. Reinigungsverfahren fĆ¼r gewerbliche oder Haushalts-Reinigungsmaschinen, umfassend einen alkalischen und einen sauren Reinigungsschritt sowie einen oder mehrere weitere alkalische und/oder saure Reinigungsschritte.1. Cleaning method for commercial or household cleaning machines, comprising an alkaline and an acidic cleaning step and one or more further alkaline and / or acidic cleaning steps.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daƟ auf wenigstens einen alkalischen Reinigungsschritt ein saurer Reinigungsschritt und auf diesen sauren Reinigungsschritt ein alkalischer Reinigungsschritt folgt mit der MaƟgabe, daƟ insgesamt wenigstens drei Reinigungsschritte enthalten sind.2. The method according to claim 1, characterized in that an acidic cleaning step follows at least one alkaline cleaning step and an alkaline cleaning step follows this acidic cleaning step with the proviso that a total of at least three cleaning steps are included.
3. Verfahren nach einem der AnsprĆ¼che 1 oder 2, dadurch gekennzeichnet, daƟ der erste der genannten Reinigungsschritte ein alkalischer Reinigungsschritt ist.3. The method according to any one of claims 1 or 2, characterized in that the first of said cleaning steps is an alkaline cleaning step.
4. Verfahren nach einem oder mehreren der AnsprĆ¼che 1 bis 3, dadurch gekennzeichnet, daƟ bei dem oder den alkalischen Reinigungsschritten die zu reinigende OberflƤche mit einer oder mehreren wƤƟrigen Reinigungslƶsungen in Kontakt gebracht wird, die zwischen 0,1 und 4 Gew.-% eines AlkalitrƤgers, vorzugsweise eines Hydroxids ausgewƤhlt aus Natrium-, Kaliumhydroxid oder Gemischen derselben enthalten.4. The method according to one or more of claims 1 to 3, characterized in that in the alkaline cleaning step or steps, the surface to be cleaned is brought into contact with one or more aqueous cleaning solutions containing between 0.1 and 4% by weight of a Contain alkali carrier, preferably a hydroxide selected from sodium, potassium hydroxide or mixtures thereof.
5. Verfahren nach einem oder mehreren der AnsprĆ¼che 1 bis 4, dadurch gekennzeichnet, daƟ bei dem oder den sauren Reinigungsschritten die zu reinigende OberflƤche mit einer oder mehreren wƤƟrigen Reinigungslƶsungen in Kontakt gebracht wird, die zwischen 0,1 und 10 Gew.-% einer oder mehrerer SƤuren enthalten.5. The method according to one or more of claims 1 to 4, characterized in that in the acidic cleaning step (s) the surface to be cleaned is brought into contact with one or more aqueous cleaning solutions containing between 0.1 and 10% by weight of a or contain more acids.
6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daƟ die genannte SƤure eine mineralische und/oder organische SƤure, vorzugsweise ausgewƤhlt aus SchwefelsƤure, SalpetersƤure, PhosphorsƤure, AmeisensƤure, EssigsƤure, GlykolsƤure, ZitronensƤure, MaleinsƤure, MilchsƤure, GluconsƤure, AlkylsulfonsƤure, AmidosulfonsƤure, SuccinsƤure, GlutarsƤure, AdipinsƤure, PhosphonsƤuren, PolyacrylsƤuren oder Mischungen derselben ist.6. The method according to claim 5, characterized in that said acid is a mineral and / or organic acid, preferably selected from sulfuric acid, nitric acid, phosphoric acid, formic acid, acetic acid, glycolic acid, citric acid, maleic acid, Lactic acid, gluconic acid, alkyl sulfonic acid, amidosulfonic acid, succinic acid, glutaric acid, adipic acid, phosphonic acids, polyacrylic acids or mixtures thereof.
7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daƟ die genannte SƤure eine Komponente mit komplexierenden Eigenschaften ist.7. The method according to claim 6, characterized in that said acid is a component with complexing properties.
8. Verfahren nach einem oder mehreren der AnsprĆ¼che 4 bis 7, dadurch gekennzeichnet, daƟ die Temperatur der genannten Reinigungslƶsungen zwischen 35 und 80 Ā°C liegt.8. The method according to one or more of claims 4 to 7, characterized in that the temperature of said cleaning solutions is between 35 and 80 Ā° C.
9. Verfahren nach einem oder mehreren der AnsprĆ¼che 1 bis 8, dadurch gekennzeichnet, daƟ nach dem letzten Reinigungsschritt die zu reinigende OberflƤche mit einer vorzugsweise sauer oder neutral eingestellten wƤƟrigen Lƶsung, enthaltend wenigstens eine KlarspĆ¼lerkomponente, behandelt wird.9. The method according to one or more of claims 1 to 8, characterized in that after the last cleaning step, the surface to be cleaned is treated with a preferably acidic or neutral aqueous solution containing at least one rinse aid component.
10. Verfahren nach einem oder mehreren der AnsprĆ¼che 1 bis 9, dadurch gekennzeichnet, daƟ der Zeitaufwand fĆ¼r die genannten Reinigungsschritte jeweils zwischen 10 Sekunden und 30 Minuten betrƤgt.10. The method according to one or more of claims 1 to 9, characterized in that the time required for said cleaning steps is in each case between 10 seconds and 30 minutes.
11. Verfahren gemƤƟ einem oder mehreren der AnsprĆ¼che 1 bis 10 zur Entfernung mineralischer Verunreinigungen und/oder zur StƤrkeablƶsung von OberflƤchen.11. The method according to one or more of claims 1 to 10 for the removal of mineral contaminants and / or for starch detachment from surfaces.
12. Verfahren gemƤƟ einem oder mehreren der AnsprĆ¼che 1 bis 11 zur Reinigung von Geschirr im Haushalt und im gewerblichen Bereich.12. The method according to one or more of claims 1 to 11 for cleaning dishes in the household and in the commercial sector.
13. Gewerbliche GeschirrspĆ¼lmaschine, die mehrere Tanks enthƤlt, die in bekannter Weise kaskadenartig aneinandergesetzt sind und aus denen SpĆ¼lbzw. Waschflotte gegen das Geschirr gesprĆ¼ht wird, um anschlieƟend wieder in die Tanks abzulaufen, dadurch gekennzeichnet, daƟ die Tanks, die gemƤƟ einem oder mehreren der AnsprĆ¼che 1 bis 12 fĆ¼r einen oder mehrere saure Reinigungsschritte vorgesehen sind, aus sƤureresistentem Material bestehen und/oder mit sƤureresistentem Material ausgekleidet sind.13. Commercial dishwasher, which contains several tanks that are cascaded together in a known manner and from which rinsing or. Washing liquor is sprayed against the dishes in order to then run back into the tanks, characterized in that the tanks according to one or more of claims 1 to 12 for one or more acidic Cleaning steps are provided, consist of acid-resistant material and / or are lined with acid-resistant material.
14. Eintank-Waschmaschine, beispielsweise Haushalts-GeschirrspĆ¼lmaschine, die fĆ¼r ein Verfahren gemƤƟ einem oder mehreren der AnsprĆ¼che 1 bis 12 geeignet ist, und an den aufgrund eines Verfahrens gemƤƟ den AnsprĆ¼chen 1 bis 12 mit sauren Reinigungslƶsungen in BerĆ¼hrung kommenden Stellen aus sƤureresistentem Material besteht und/oder mit sƤureresistentem Material ausgekleidet ist. 14. One-tank washing machine, for example household dishwasher, which is suitable for a method according to one or more of claims 1 to 12, and at the points coming into contact with acidic cleaning solutions due to a method according to claims 1 to 12 consists of acid-resistant material and / or is lined with acid-resistant material.
EP02743135A 2001-06-08 2002-05-31 Cleaning method for removing starch Expired - Lifetime EP1392807B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10127919 2001-06-08
DE10127919A DE10127919A1 (en) 2001-06-08 2001-06-08 Washing processes, for removing mineral or starch deposits in industrial or domestic dishwashers is effected with both alkaline and acidic stages
PCT/EP2002/005964 WO2002100993A1 (en) 2001-06-08 2002-05-31 Cleaning method for removing starch

Publications (2)

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EP1392807A1 true EP1392807A1 (en) 2004-03-03
EP1392807B1 EP1392807B1 (en) 2004-09-22

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US (1) US20040173244A1 (en)
EP (1) EP1392807B1 (en)
JP (1) JP4202910B2 (en)
AT (1) ATE277157T1 (en)
CA (1) CA2448548C (en)
DE (2) DE10127919A1 (en)
ES (1) ES2230503T3 (en)
PL (1) PL201167B1 (en)
WO (1) WO2002100993A1 (en)

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ES2230503T3 (en) 2005-05-01
PL367269A1 (en) 2005-02-21
PL201167B1 (en) 2009-03-31
JP4202910B2 (en) 2008-12-24
EP1392807B1 (en) 2004-09-22
CA2448548C (en) 2010-05-25
DE10127919A1 (en) 2002-12-19
DE50201125D1 (en) 2004-10-28
CA2448548A1 (en) 2002-12-19
US20040173244A1 (en) 2004-09-09
ATE277157T1 (en) 2004-10-15
JP2004533301A (en) 2004-11-04
WO2002100993A1 (en) 2002-12-19

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