EP2209937A1 - Method for treating laundry in a household washing machine having a foam-forming float - Google Patents

Method for treating laundry in a household washing machine having a foam-forming float

Info

Publication number
EP2209937A1
EP2209937A1 EP08846270A EP08846270A EP2209937A1 EP 2209937 A1 EP2209937 A1 EP 2209937A1 EP 08846270 A EP08846270 A EP 08846270A EP 08846270 A EP08846270 A EP 08846270A EP 2209937 A1 EP2209937 A1 EP 2209937A1
Authority
EP
European Patent Office
Prior art keywords
foam
amount
added
washing
drum
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
EP08846270A
Other languages
German (de)
French (fr)
Other versions
EP2209937B1 (en
Inventor
Thomas Koch
Ingo Schulze
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete GmbH
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Application filed by BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP2209937A1 publication Critical patent/EP2209937A1/en
Application granted granted Critical
Publication of EP2209937B1 publication Critical patent/EP2209937B1/en
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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F35/00—Washing machines, apparatus, or methods not otherwise provided for
    • D06F35/005—Methods for washing, rinsing or spin-drying
    • D06F35/006—Methods for washing, rinsing or spin-drying for washing or rinsing only
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/20—Washing liquid condition, e.g. turbidity
    • D06F2103/22—Content of detergent or additives
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/06—Arrangements for preventing or destroying scum

Definitions

  • the present invention relates to a method for treating laundry in a household washing machine with a foam-forming liquor, comprising at least one washing process and at least one rinsing process.
  • the detergents used in conventional washing machines are based on surfactants. Due to their amphiphilic molecular structure, these washing-active substances are able to form a thin layer on the water surface and thereby lower the surface tension of the water.
  • the surfactants are also those which give the water the ability to foam.
  • the reduction of the surface tension of the aqueous phase by addition of surfactants at the interface water / air has the consequence that the introduction of air, such as by mechanics entry when rotating a laundry drum, air bubbles are generated and can be partially stabilized by the formation of a surface layer without coalescing too fast.
  • the basis for the formation of foam is thus a dispersion of air in wash liquor.
  • the foams produced during washing are usually metastable foams which have a certain but limited lifetime. The lifetime is influenced by different quantities, for example by the type of surfactant, its concentration, the intensity of the air intake, the diameter of the resulting bubbles. If the life of the foam is very short, it is called an unstable foam.
  • spherical foams Two types are further distinguished: spherical foams and polyhedral foams. In a foaming liquid such as a wash liquor, both types usually occur, wherein the polyhedra foam is located above the ball foam.
  • foam can certainly also have beneficial effects. For example, foam dampens laundry during washing, and thus the mechanical input can be reduced despite a continuous rotary movement of the drum. This allows for a gentler
  • Drum is hardly moved at all to keep the mechanical effect on the laundry as low as possible.
  • the invention had the object of providing a method for treating laundry, which on the one hand allows utilization of the desired properties of foam during washing, without having the disadvantages, which brings a foaming with it.
  • the inventive method for treating laundry in a household washing machine with a foam-forming liquor comprises at least one washing process, is used in the foam-forming liquor, and at least one rinsing process and is characterized in that for controlling the amount of foam during the washing process, a foam-promoting agent in a predetermined amount automatically added and automatically added a foam-inhibiting agent in a predetermined amount before completion of the rinsing process.
  • This method has the great advantage that due to the chemical control of the foaming the respective washing program does not have to be changed or only minimal. This avoids time-consuming waiting times that were previously necessary to remove foam. At the same time, this process also makes it possible to utilize the positive properties of foam formation.
  • This method is particularly suitable for household washing machines with an automatic dosing device.
  • the amount of foam formed is monitored by a sensor.
  • foam sensors are already known in the prior art.
  • pressure sensors but also particularly suitable are optical sensors and the like.
  • a specific foam level can be predetermined by the setting of a foam threshold, so that upon reaching, falling short of or exceeding a foam threshold, signals can be emitted in each case so that a corresponding measure can be taken.
  • the sensor monitors the amount of foam and, when it falls below the foam threshold value, sends a signal to a control unit, which enables the automatic addition of a foam-promoting agent.
  • a foam-inhibiting agent is added.
  • foam threshold values for different washing programs. For example, in a gentle cycle for wool or silk, a higher foam level is required than in a full wash cycle.
  • These foam threshold values are preferably already entered into the mentioned control unit or it is preprogrammed.
  • the threshold value is in turn coupled to a signal which allows the metered addition of one of the foam-promoting or foam-inhibiting or foam-stabilizing agents mentioned. Shortly before rinsing or during rinsing, a foam-inhibiting agent is added to eliminate the foam formed as completely as possible. In this way, the problem is avoided that by clogging the gap between the drum and the tub adhering foam is prevented from spinning intended water.
  • foaming, foam stabilizing and antifoaming agents which can be used according to the invention are already known in the prior art.
  • Foaming agents include all agents which promote foaming, while foaming agents are understood to mean those which prevent foaming or destroy existing foam.
  • Foaming agents also include foam stabilizing agents.
  • foaming agents for example, the same surfactants can be used, which are already present in conventional detergents. That is, as a foam-promoting agent, among other things, the detergent used in a desired wash program is considered. To form a desired amount of foam, the detergent can be metered in differently, for example by adjusting a certain concentration or by adding it gradually or continuously until the required total amount is reached.
  • the treatment agent which usually contains surfactants
  • the drum can be moved at the same time, so that the mechanical effect of a certain air entry comes about and the foam can form.
  • a foam-promoting agent can be added in addition to sufficient even with little movement and mechanics To form foam.
  • the antifoaming agent may, in addition to this main function, have other functions supporting the rinsing process, such as a lowering of alkalinity, complexing, flocculation and the like.
  • the foam-forming liquor is an aqueous solution of water and treating agents used to treat the laundry during the washing process. Treating agents include conventional detergents, detergency aids, additives and the foam promoting and antifoaming agents. When rinsing the fleet is gradually replaced by fresh water.
  • the household washing machine has one or more containers for receiving the above-mentioned means, as well as a metering device for the automatic addition of the agent during the washing and rinsing process.
  • these agents can be refilled or emptied by the user as needed.
  • the containers can also be designed as disposable cartridges or refillable cartridges.
  • An existing in modern household washing machines control device can be provided to control the method according to the invention with a suitable control program, which performs the method steps.
  • a subset of a foam-forming detergent is added to a laundry during a washing process.
  • foam is built up by the rotating drum at a predetermined speed, usually at the normal washing speed, which is 55 rpm in commercial washing machines.
  • the amount of foam is monitored continuously via a foam sensor, thus roughly setting a given foam level.
  • the fine adjustment of the amount of foam is achieved via defined additions of foam-promoting, foam-stabilizing and / or foam-inhibiting agents. This can be done both with and without changing the other device parameters.
  • the foam is removed again by adding a foam-inhibiting agent. This can be both with and done without changing the other device parameters. As a result, short and water and energy-saving procedures are achieved.
  • the present invention enables rapid and efficient foam generation / stabilization and removal, as well as energy and water saving laundry treatment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Detergent Compositions (AREA)
  • Accessory Of Washing/Drying Machine, Commercial Washing/Drying Machine, Other Washing/Drying Machine (AREA)
  • Physical Water Treatments (AREA)

Abstract

A household washing machine that includes a foam-promoting agent dispenser that adds a predetermined amount of a foam-promoting agent during a washing cycle, and a foam-inhibiting agent dispenser that adds a predetermined amount of a foam-inhibiting agent before the end of a rinsing cycle.

Description

Verfahren zum Behandeln von Waschgut in einer Haushaltswaschmaschine mit einer schaumbildenden Flotte Process for treating laundry in a household washing machine with a foam-forming liquor
Die vorliegende Erfindung betrifft ein Verfahren zum Behandeln von Waschgut in einer Haushaltswaschmaschine mit einer schaumbildenden Flotte, umfassend mindestens einen Waschvorgang und mindestens einen Spülvorgang.The present invention relates to a method for treating laundry in a household washing machine with a foam-forming liquor, comprising at least one washing process and at least one rinsing process.
Die in herkömmlichen Waschmaschinen verwendeten Waschmittel basieren auf Tensiden. Diese waschaktiven Substanzen sind in der Lage, aufgrund ihres amphiphilen molekularen Aufbaus auf der Wasseroberfläche eine dünne Schicht auszubilden und dadurch die Oberflächenspannung des Wassers zu senken. Die Tenside sind es auch, welche dem Wasser die Fähigkeit zur Schaumbildung verleihen. Die Herabsetzung der Oberflächenspannung der wässrigen Phase durch Anlagerung von Tensiden an der Grenzfläche Wasser/Luft hat zur Folge, dass durch das Einbringen von Luft, wie etwa durch Mechanikeintrag beim Rotieren einer Wäschetrommel, Luftbläschen erzeugt werden und partiell durch die Ausbildung einer Oberflächenschicht stabilisiert werden können, ohne dass sie zu schnell koaleszieren. Die Grundlage für die Entstehung von Schaum ist somit eine Dispersion von Luft in Waschlauge. Bei den beim Waschen erzeugten Schäumen handelt es sich in der Regel um metastabile Schäume, die eine gewisse, jedoch begrenzte Lebensdauer haben. Die Lebensdauer wird durch unterschiedliche Größen beeinflusst, beispielsweise durch die Art des Tensids, dessen Konzentration, die Intensität des Lufteintrags, den Durchmesser der entstehenden Bläschen. Ist die Lebensdauer des Schaums sehr kurz, spricht man von einem instabilen Schaum.The detergents used in conventional washing machines are based on surfactants. Due to their amphiphilic molecular structure, these washing-active substances are able to form a thin layer on the water surface and thereby lower the surface tension of the water. The surfactants are also those which give the water the ability to foam. The reduction of the surface tension of the aqueous phase by addition of surfactants at the interface water / air has the consequence that the introduction of air, such as by mechanics entry when rotating a laundry drum, air bubbles are generated and can be partially stabilized by the formation of a surface layer without coalescing too fast. The basis for the formation of foam is thus a dispersion of air in wash liquor. The foams produced during washing are usually metastable foams which have a certain but limited lifetime. The lifetime is influenced by different quantities, for example by the type of surfactant, its concentration, the intensity of the air intake, the diameter of the resulting bubbles. If the life of the foam is very short, it is called an unstable foam.
Es werden weiterhin zwei Arten von Schäumen unterschieden: Kugelschäume und Polyederschäume. Bei einer schäumenden Flüssigkeit wie etwa einer Waschflotte, treten in der Regel beide Arten auf, wobei sich der Polyederschaum oberhalb des Kugelschaumes befindet.Two types of foams are further distinguished: spherical foams and polyhedral foams. In a foaming liquid such as a wash liquor, both types usually occur, wherein the polyhedra foam is located above the ball foam.
Insbesondere kleinporige Polyederschäume können jedoch beim Waschvorgang in einer Haushalts-Trommelwaschmaschine hinderlich oder gar schädlich sein. Derartige kleinporige Polyederschäume können einen robusten Schaumteppich ausbilden, welcher in den Zwischenraum zwischen Innentrommel und Laugenbehälter gelangt, dort haften bleibt und schwer abzupumpen ist. Während des Spülschleuderns verhindert dieser zusätzlich den Abtransport des ausgeschleuderten Wassers. Dies führt wiederum dazu, dass sich zusätzlicher Schaum aufbaut. Ohne Schaumbeseitigungsmaßnahmen führt dies häufig zum Überschäumen des Gerätes, d.h., der Schaum dringt insbesondere aus den Öffnungen des Laugenbehälters, wie etwa der Laugenbehälterbelüftung und dem Einfüllschlauch. Schaum kann sich ebenfalls nachteilig auf die Pumpe zum Abpumpen der gebrauchten Flotte auswirken.However, especially small-pore polyhedral foams can be hindering or even harmful during the washing process in a household drum washing machine. such Small-pore polyhedral foams can form a robust foam carpet, which gets into the space between the inner drum and the tub, sticks there and is difficult to pump. During the Spülschleuderns this also prevents the removal of the ejected water. This in turn causes additional foam to build up. Without foam removal measures, this often leads to foaming of the device, ie, the foam penetrates in particular from the openings of the tub, such as the tub ventilation and the filling hose. Foam may also be detrimental to the pump for pumping out the used liquor.
Aus diesem Grund hat man im Stand der Technik bereits eine Reihe von Verfahren entwickelt, um überschüssigen Schaum zu beseitigen. Im Stand der Technik wurde dies hauptsächlich auf mechanische Art und Weise versucht.For this reason, a number of methods have been developed in the prior art to remove excess foam. In the prior art this has been attempted mainly in a mechanical way.
In der DE 43 34 969 A1 ist eine Einrichtung zur Zerstörung von Waschmittelschaum in einer Waschmaschine mit einer drehbaren Trommel und einem Laugenbehälter beschrieben, die eine Vorrichtung zur Erzeugung von Heißluft aufweist, welche durch eine Zuleitung in der Laugenbehälterwand zwischen den Laugenbehälter und die Trommel geleitet wird.In DE 43 34 969 A1 a device for the destruction of detergent foam in a washing machine with a rotatable drum and a tub is described which has a device for generating hot air, which is passed through a supply line in the tub wall between the tub and the drum ,
Gemäß der Offenbarung der DE 41 04 151 A1 wird Schaum, welcher in einer Waschmaschine unerwünscht auftritt, durch Einschalten einer Heizeinrichtung zerstört.According to the disclosure of DE 41 04 151 A1, foam which occurs undesirably in a washing machine is destroyed by switching on a heating device.
In der EP 0 278 239 A1 wird eine übermäßige Schaumbildung im Hauptwaschgang, die während des Heizens von Waschlauge im Laugenbehälter zu beobachten ist, durch Zugabe einer begrenzten Menge kalten Wassers und/oder durch vorübergehendes Ausschalten der Laugenheizung beseitigt.In EP 0 278 239 A1, excessive foam formation in the main wash, which can be observed during the heating of wash liquor in the tub, is eliminated by adding a limited amount of cold water and / or by temporarily switching off the liquor heating.
Als einzige chemische Maßnahme zur Schaumbekämpfung ist im Stand der Technik bekannt, Weichspüler schon relativ frühzeitig im Spülgang zuzuleiten, da dieser aufgrund seiner Zusammensetzung aus kationischen Tensiden eine entschäumende Wirkung hat. In der DE 102 34 472 A1 sind verschiedene Maßnahmen zur Schaumbeseitigung genannt, unter anderem auch die automatische Zudosierung einer Substanz zur Inhibition des Schaums.As the only chemical measure for foam control is known in the art, fabric softener already relatively early in the rinse zuzuleiten, since this has a defoaming effect due to its composition of cationic surfactants. In DE 102 34 472 A1 various measures for foam removal are mentioned, including the automatic metered addition of a substance for inhibiting the foam.
Die meisten im Stand der Technik bekannten Schaumbeseitigungsmaßnahmen sind jedoch mit Nachteilen verbunden, wie etwa erhöhtem Wasserverbrauch, erhöhtem Stromverbrauch durch zusätzliche Heizung und längere Standzeiten, welche die Gesamtdauer eines Programms verlängern.However, most foam removal measures known in the art suffer from disadvantages such as increased water consumption, increased power consumption through additional heating, and longer service lives that extend the overall duration of a program.
Neben den unerwünschten Wirkungen von Waschmittelschaum in Haushaltswaschmaschinen hat sich jedoch auch herausgestellt, dass Schaum durchaus auch vorteilhafte Wirkungen haben kann. So dämpft Schaum beim Waschen beispielsweise den Wäschefall, und es kann so trotz einer kontinuierlichen Drehbewegung der Trommel der Mechanikeintrag verringert werden. Dies ermöglicht ein sanfteresIn addition to the undesirable effects of detergent foam in household washing machines, however, it has also been found that foam can certainly also have beneficial effects. For example, foam dampens laundry during washing, and thus the mechanical input can be reduced despite a continuous rotary movement of the drum. This allows for a gentler
Waschen für empfindliche Gewebe, wie etwa Wolle und Seide. In herkömmlichen Wollwaschverfahren sind in der Regel lange Standzeiten vorgesehen, bei denen dieWashing for delicate fabrics, such as wool and silk. In conventional Wollwaschverfahren long service lives are usually provided, in which the
Trommel fast gar nicht bewegt wird, um die Mechanikeinwirkung auf die Wäsche so gering wie möglich zu halten.Drum is hardly moved at all to keep the mechanical effect on the laundry as low as possible.
Der Erfindung lag die Aufgabe zugrunde, ein Verfahren zum Behandeln von Waschgut bereitzustellen, welches einerseits eine Nutzbarmachung der gewünschten Eigenschaften von Schaum beim Waschen ermöglicht, ohne die Nachteile aufzuweisen, welche eine Schaumbildung mit sich bringt.The invention had the object of providing a method for treating laundry, which on the one hand allows utilization of the desired properties of foam during washing, without having the disadvantages, which brings a foaming with it.
Diese Aufgabe wird erfindungsgemäß gelöst durch ein Verfahren gemäß Anspruch 1. Die Unteransprüche betreffen bevorzugte Ausführungsformen, welche einzeln oder in Kombination miteinander eingesetzt werden können.This object is achieved by a method according to claim 1. The dependent claims relate to preferred embodiments, which can be used individually or in combination with each other.
Das erfindungsgemäße Verfahren zum Behandeln von Waschgut in einer Haushaltswaschmaschine mit einer schaumbildenden Flotte, umfasst mindestens einen Waschvorgang, bei die schaumbildenden Flotte eingesetzt wird, und mindestens einen Spülvorgang und ist dadurch gekennzeichnet, dass zur Steuerung der Schaummenge während des Waschvorgangs ein schaumförderndes Mittel in einer vorgebbaren Menge automatisch hinzugegeben wird und vor Beendigung des Spülvorgangs ein schaumhemmendes Mittel in einer vorgebbaren Menge automatisch hinzugegeben wird.The inventive method for treating laundry in a household washing machine with a foam-forming liquor comprises at least one washing process, is used in the foam-forming liquor, and at least one rinsing process and is characterized in that for controlling the amount of foam during the washing process, a foam-promoting agent in a predetermined amount automatically added and automatically added a foam-inhibiting agent in a predetermined amount before completion of the rinsing process.
Dieses Verfahren hat den großen Vorteil, dass durch die chemische Steuerung der Schaumbildung das jeweilige Waschprogramm nicht oder nur minimal verändert werden muss. So werden aufwändige Wartezeiten vermieden, die zuvor zur Schaumbeseitigung nötig waren. Gleichzeitig ermöglicht dieses Verfahren auch die Nutzbarmachung der positiven Eigenschaften der Schaumbildung.This method has the great advantage that due to the chemical control of the foaming the respective washing program does not have to be changed or only minimal. This avoids time-consuming waiting times that were previously necessary to remove foam. At the same time, this process also makes it possible to utilize the positive properties of foam formation.
Dieses Verfahren ist besonders geeignet für Haushaltswaschmaschinen mit einer automatischen Dosiereinrichtung.This method is particularly suitable for household washing machines with an automatic dosing device.
Vorzugsweise wird während des Waschvorgangs und/oder des Spülvorgangs die Menge an gebildeten Schaum durch einen Sensor überwacht. Derartige Schaumsensoren sind im Stand der Technik bereits bekannt. Zum einen gibt es Drucksensoren, besonders geeignet sind jedoch auch optische Sensoren und dergleichen. Vorzugsweise ist ein bestimmtes Schaumniveau durch die Einstellung eines Schaumschwellwertes vorgebbar, sodass bei Erreichen, Unterschreiten oder Überschreiten eines Schaumschwellwertes jeweils Signale ausgesendet werden können, damit eine entsprechende Maßnahme getroffen werden kann. Während des Waschens kann es sinnvoll und wünschenswert sein, eine gewisse Menge an Schaum beizubehalten. Der Sensor überwacht die Schaummenge und gibt bei Unterschreiten des Schaumschwellwertes ein Signal an eine Steuereinheit, welche die automatische Zugabe eines schaumfördernden Mittels ermöglicht. Im umgekehrten Fall kann es in einer bevorzugten Ausführungsform vorgesehen sein, dass bei Überschreiten des Schaumschwellwertes ein schaumhemmendes Mittel hinzugegeben wird.Preferably, during the washing and / or rinsing process, the amount of foam formed is monitored by a sensor. Such foam sensors are already known in the prior art. On the one hand, there are pressure sensors, but also particularly suitable are optical sensors and the like. Preferably, a specific foam level can be predetermined by the setting of a foam threshold, so that upon reaching, falling short of or exceeding a foam threshold, signals can be emitted in each case so that a corresponding measure can be taken. During washing, it may be useful and desirable to retain some amount of foam. The sensor monitors the amount of foam and, when it falls below the foam threshold value, sends a signal to a control unit, which enables the automatic addition of a foam-promoting agent. In the opposite case, it may be provided in a preferred embodiment that when the foam threshold value is exceeded, a foam-inhibiting agent is added.
Es ist auch möglich, für jeweils unterschiedliche Waschprogramme verschiedene Schaumschwellwerte einzugeben. So wird beispielsweise bei einem Schonwaschgang für Wolle oder Seide ein höheres Schaumniveau gefordert als bei einem Vollwaschgang. Vorzugsweise werden diese Schaumschwellwerte bereits in die genannte Steuereinheit eingegeben bzw. diese wird vorprogrammiert. Der Schwellwert ist wiederum an ein Signal gekoppelt, welches das Zudosieren eines der genannten schaumfördernden oder schaumhemmenden oder schaumstabilisierenden Mittel ermöglicht. Kurz vor dem Spülen oder auch während des Spülens wird ein schaumhemmendes Mittel hinzugefügt, um den gebildeten Schaum möglichst vollständig zu beseitigen. Auf diese Weise wird das Problem vermieden, dass durch ein Verstopfen des Zwischenraums zwischen der Trommel und dem Laugenbehälter haftenden Schaums ein mit dem Schleudern beabsichtigtes Auftreiben des Wassers behindert wird.It is also possible to enter different foam threshold values for different washing programs. For example, in a gentle cycle for wool or silk, a higher foam level is required than in a full wash cycle. These foam threshold values are preferably already entered into the mentioned control unit or it is preprogrammed. The threshold value is in turn coupled to a signal which allows the metered addition of one of the foam-promoting or foam-inhibiting or foam-stabilizing agents mentioned. Shortly before rinsing or during rinsing, a foam-inhibiting agent is added to eliminate the foam formed as completely as possible. In this way, the problem is avoided that by clogging the gap between the drum and the tub adhering foam is prevented from spinning intended water.
Natürlich ist es auch möglich, zur Steuerung der Schaummenge zusätzlich gerätespezifische Maßnahmen einzusetzen. Zur Schaumerzeugung bietet sich hierbei eine Trommelbewegung mit möglichst viel Mechanikeintrag an und zusätzlich kann auch Luft in die Waschlauge hineingepumpt werden. Außerdem kann die Flottentemperatur, der Wasserstand und die Trommelbewegung (Drehzahl, Reversierrhythmus etc.), die Zeitdauer der Trommelbewegung sowie die Gerätetemperatur variiert werden, um eine Schaumbildung zu fördern oder zu vermindern.Of course, it is also possible to use additional device-specific measures to control the amount of foam. To generate foam in this case offers a drum movement with as much mechanics entry and in addition also air can be pumped into the wash. In addition, the float temperature, the water level and the drum movement (speed, reversing rhythm, etc.), the duration of the drum movement and the device temperature can be varied to promote or reduce foaming.
Die erfindungsgemäß verwendbaren Mittel für die Schaumbildung, Schaumstabilisierung und Schaumverhinderung sind im Stand der Technik bereits bekannt. Schaumfördernde Mittel umfassen alle Mittel, welche eine Schaumbildung begünstigen, während unter schaumhemmenden Mitteln solche Mittel verstanden werden, die eine Schaumbildung verhindern oder bestehenden Schaum zerstören können. Schaumfördernde Mittel umfassen auch schaumstabilisierende Mittel.The foaming, foam stabilizing and antifoaming agents which can be used according to the invention are already known in the prior art. Foaming agents include all agents which promote foaming, while foaming agents are understood to mean those which prevent foaming or destroy existing foam. Foaming agents also include foam stabilizing agents.
Als schaumfördernde Mittel können beispielsweise dieselben Tenside eingesetzt werden, die bereits in herkömmlichen Waschmitteln vorhanden sind. D.h., als schaumförderndes Mittel wird unter anderem auch das in einem gewünschten Waschprogramm eingesetzte Waschmittel angesehen. Zur Bildung einer gewünschten Menge Schaum kann das Waschmittel unterschiedlich zudosiert werden, beispielsweise durch Einstellen einer bestimmten Konzentration oder auch durch schrittweise oder kontinuierliche Zugabe, bis die erforderliche Gesamtmenge erreicht ist. Während der Zugabe des Behandlungsmittels, welches in der Regel Tenside enthält, kann gleichzeitig die Trommel bewegt werden, damit durch die Mechanikeinwirkung ein gewisser Lufteintrag zustande kommt und sich der Schaum bilden kann. Für diejenigen Fälle, in der die Trommelbewegung reduziert ist, kann zusätzlich ein schaumförderndes Mittel hinzugegeben werden, um auch bei wenig Bewegung und Mechanikeinwirkung genügend Schaum zu bilden. Das schaumhemmende Mittel kann zusätzlich zu dieser Hauptfunktion weitere, den Spülprozess unterstützende Funktionen besitzen, wie etwa eine Absenkung der Alkalität, Komplexbildung, Ausflockung und dergleichen.As foaming agents, for example, the same surfactants can be used, which are already present in conventional detergents. That is, as a foam-promoting agent, among other things, the detergent used in a desired wash program is considered. To form a desired amount of foam, the detergent can be metered in differently, for example by adjusting a certain concentration or by adding it gradually or continuously until the required total amount is reached. During the addition of the treatment agent, which usually contains surfactants, the drum can be moved at the same time, so that the mechanical effect of a certain air entry comes about and the foam can form. For those cases in which the drum movement is reduced, a foam-promoting agent can be added in addition to sufficient even with little movement and mechanics To form foam. The antifoaming agent may, in addition to this main function, have other functions supporting the rinsing process, such as a lowering of alkalinity, complexing, flocculation and the like.
Die schaumbildende Flotte ist eine wässrige Lösung aus Wasser und Behandlungsmitteln, die während des Waschvorgangs zum Behandeln des Waschguts verwendet wird. Behandlungsmittel umfassen herkömmliche Waschmittel, Waschhilfsmittel, Zusatzstoffe und die schaumfördernden und schaumhemmenden Mittel. Beim Spülvorgang wird die Flotte nach und nach durch frisches Wasser ersetzt.The foam-forming liquor is an aqueous solution of water and treating agents used to treat the laundry during the washing process. Treating agents include conventional detergents, detergency aids, additives and the foam promoting and antifoaming agents. When rinsing the fleet is gradually replaced by fresh water.
In einer vorteilhaften maschinenbaulichen Ausführung der Erfindung besitzt die Haushaltswaschmaschine einen oder mehrere Behälter zur Aufnahme der oben genannten Mittel, sowie eine Dosiervorrichtung zur automatischen Zugabe der Mittel während des Wasch- und Spülvorgangs. Vorzugsweise können diese Mittel bei Bedarf durch den Anwender nachgefüllt oder entleert werden. Die Behälter können auch als Einmal-Kartuschen oder wiederbefüllbare Kartuschen ausgestaltet sein.In an advantageous mechanical construction of the invention, the household washing machine has one or more containers for receiving the above-mentioned means, as well as a metering device for the automatic addition of the agent during the washing and rinsing process. Preferably, these agents can be refilled or emptied by the user as needed. The containers can also be designed as disposable cartridges or refillable cartridges.
Eine in modernen Haushaltswaschmaschinen vorhandene Steuereinrichtung kann zur Steuerung des erfindungsgemäßen Verfahrens mit einem geeigneten Steuerprogramm versehen werden, welches die Verfahrensschritte durchführt.An existing in modern household washing machines control device can be provided to control the method according to the invention with a suitable control program, which performs the method steps.
In einer besonders bevorzugten Ausführungsform wird zunächst eine Teilmenge eines schaumbildenden Waschmittels zu einem Waschgut während eines Waschvorgangs hinzugegeben. Anschließend oder gleichzeitig wird durch die rotierende Trommel bei einer vorgegebenen Drehzahl, in der Regel bei der normalen Waschdrehzahl, die in handelsüblichen Waschmaschinen um die 55 U/min beträgt, Schaum aufgebaut. Die Menge an Schaum wird über einen Schaumsensor kontinuierlich überwacht und so ein vorgegebener Schaumpegel grob eingestellt. Anschließend wird die Feineinstellung der Schaummenge über definierte Zugaben schaumfördernder, schaumstabilisierender und/oder schaumhemmender Mittel erreicht. Dies kann sowohl mit als auch ohne Veränderung der übrigen Geräteparameter erfolgen. Nachdem der Waschvorgang erfolgreich durchgeführt wurde, wird der Schaum durch Zugabe eines schaumhemmenden Mittels wieder beseitigt. Dies kann gleichfalls sowohl mit als auch ohne Veränderung der übrigen Geräteparameter erfolgen. Dadurch werden kurze und wasser- und energiesparende Verfahrensabläufe erreicht.In a particularly preferred embodiment, first a subset of a foam-forming detergent is added to a laundry during a washing process. Subsequently or at the same time, foam is built up by the rotating drum at a predetermined speed, usually at the normal washing speed, which is 55 rpm in commercial washing machines. The amount of foam is monitored continuously via a foam sensor, thus roughly setting a given foam level. Subsequently, the fine adjustment of the amount of foam is achieved via defined additions of foam-promoting, foam-stabilizing and / or foam-inhibiting agents. This can be done both with and without changing the other device parameters. After the washing process has been successfully carried out, the foam is removed again by adding a foam-inhibiting agent. This can be both with and done without changing the other device parameters. As a result, short and water and energy-saving procedures are achieved.
Die vorliegende Erfindung ermöglicht eine schnelle und effiziente Schaumerzeugung/ - Stabilisierung und -beseitigung, sowie eine energie- und wassersparende Behandlung von Waschgut. The present invention enables rapid and efficient foam generation / stabilization and removal, as well as energy and water saving laundry treatment.

Claims

PATENTANSPRÜCHE
1. Verfahren zum Behandeln von Waschgut in einer Haushaltswaschmaschine mit einer schaumbildenden Flotte, umfassend mindestens einen Waschvorgang, bei dem die schaumbildende Flotte eingesetzt wird, und mindestens einen Spülvorgang, dadurch gekennzeichnet, dass zur Steuerung der Schaummenge während des Waschvorgangs ein schaumförderndes Mittel in einer vorgebbaren Menge automatisch hinzugegeben wird und vor Beendigung des Spülvorgangs ein schaumhemmendes Mittel in einer vorgebbaren Menge automatisch hinzugegeben wird.1. A method for treating laundry in a household washing machine with a foam-forming liquor, comprising at least one washing process in which the foam-forming liquor is used, and at least one rinsing process, characterized in that for controlling the amount of foam during the washing process, a foam-promoting agent in a predeterminable Amount added automatically and a foam-inhibiting agent is automatically added in a predetermined amount before the end of the rinsing process.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die Menge an gebildetem Schaum durch einen Sensor überwacht wird.2. The method according to claim 1, characterized in that the amount of foam formed is monitored by a sensor.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass ein Schaumschwellwert für die Menge an gebildetem Schaum vorgegeben wird und dass bei Unterschreiten des Schaumschwellwertes ein schaumförderndes Mittel hinzugegeben wird und bei Überschreiten des Schaumschwellwertes ein schaumhemmendes Mittel hinzugegeben wird.3. The method according to claim 1 or 2, characterized in that a Schaumschwellwert is specified for the amount of foam formed and that falls below the Schaumschwellwertes a foam-promoting agent is added and when the Schaumschwellwertes is exceeded, a foam-inhibiting agent is added.
4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass zum Erhalten des Schaumschwellwertes ein schaumstabilisierendes Mittel hinzugefügt wird.A method according to claim 3, characterized in that a foam stabilizing agent is added to obtain the foam threshold.
5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass vor und/oder während des Spülvorgangs ein schaumhemmendes Mittel hinzugefügt wird.5. The method according to any one of the preceding claims, characterized in that a foam-inhibiting agent is added before and / or during the rinsing process.
6. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zur Steuerung der Schaummenge zusätzlich gerätespezifische Maßnahmen eingesetzt werden.6. The method according to any one of the preceding claims, characterized in that additional device-specific measures are used to control the amount of foam.
7. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass die gerätespezifischen Maßnahmen ausgewählt werden aus: der Variation der Gerätetemperatur, der Flottentemperatur, des Wasserstands, der Förderleistung einer Luftpumpe, der Trommelbewegung, der Zeitdauer der Trommelbewegung, und der Trommel-Drehzahl. 7. The method according to claim 5, characterized in that the device-specific measures are selected from: the variation of the device temperature, the Float temperature, water level, air pump delivery, drum travel, drum movement time, and drum speed.
EP08846270A 2007-11-06 2008-10-15 Method for treating laundry in a household washing machine having a foam-forming float Active EP2209937B1 (en)

Applications Claiming Priority (2)

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DE102007052837A DE102007052837A1 (en) 2007-11-06 2007-11-06 Process for treating laundry in a household washing machine with a foam-forming liquor
PCT/EP2008/063895 WO2009059875A1 (en) 2007-11-06 2008-10-15 Method for treating laundry in a household washing machine having a foam-forming float

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ATE500372T1 (en) 2011-03-15
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DE102007052837A1 (en) 2009-05-07
US20100205752A1 (en) 2010-08-19
CN101849059A (en) 2010-09-29
EP2209937B1 (en) 2011-03-02
EA201070559A1 (en) 2010-12-30
US8650689B2 (en) 2014-02-18
CN101849059B (en) 2012-04-18
DE502008002778D1 (en) 2011-04-14

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