EP3536844A1 - Method for treating laundry in a washing machine and washing machine suitable for this purpose - Google Patents

Abstract

The invention relates to a method for treating items of laundry 4 in a washing machine 1, which has a tub 2 and a drum 3 rotatably mounted therein about a substantially horizontal axis for receiving the items 4 and a control device 7, wherein the method includes the following steps (a) introducing an open or closed container 8 containing laundry treatment means into the drum 3. (b) filling an aqueous liquid 6 into the tub 2 in an amount W sufficient to make the liquid level h in the drum 3 a predetermined minimum value (c) moving the aqueous liquid 6 for a predetermined time t> 1 min, in which the drum 3 is in a resting state or is moved so that rotation of the drum 3 does not occur by an angle α ≥ 180 ° also relates to a washing machine suitable for carrying out the method.

Description

The invention relates to a method for treating laundry items in a washing machine as well as a washing machine suitable for carrying out this method.

In the treatment of laundry items in a washing machine are generally chemical laundry treatment (hereinafter sometimes also abbreviated "treatment agent") used, which may be composed differently depending on the intended use or intended effect. A laundry treating agent, e.g. a detergent or fabric softener, typically contains several components used in the laundry treatment in the washing machine, e.g. Washing clothes, have different functions. So far, laundry treatment agents have been used in the form of their finished mixtures in liquid or powder form. However, particularly powerful ingredients can interact with each other, so that a certain separation of these ingredients before contact with laundry would be useful.

Recently, the use of so-called detergent pillows has found increasing use. A detergent pad has at least one chamber surrounded by a water-soluble film, wherein the detergent pad in the chamber or chambers contains at least one liquid or powdered laundry treatment agent. The detergent pillows, at generally elevated prices, allow for easier dosage of the treating agent and, moreover, separation of potentially less compatible ingredients. So there are detergent pillows with, for example, three chambers. In this case, the ingredients remain separated until a washing program is carried out. Only when in contact with water, the film dissolves to release the active ingredients.

However, the films sometimes do not dissolve very quickly. Sometimes there are even film residues towards the end of a washing phase. In addition, the washing cushions sometimes slip into the door rubber, ie the cuff of the drum, and then come sometimes during a rinsing phase again in contact with water. This can lead under very unfavorable circumstances to the fact that even at the end of the rinsing phase still slimy residues appear in the laundry items.

Against this background, the object of the invention is to provide an improved method for treating items of laundry in a washing machine, which is particularly suitable when using detergent cushions. The object of the invention is also to show a suitable for carrying out this method washing machine.

The object underlying the invention is achieved by a method for treating laundry items and a suitable washing machine according to the independent claims. Preferred embodiments of the invention are listed in the respective dependent claims. Preferred embodiments of the method correspond to preferred embodiments of the washing machine, even if it is not separately pointed out here in each case.

1. (a) Einbringen eines Wäschebehandlungsmittel enthaltenden offenen oder geschlossenen Behälters, in die Trommel;
2. (b) Einfüllen einer wässrigen Flüssigkeit in den Laugenbehälter in einer Menge W, die ausreicht, dass der Flüssigkeitsstand h in der Trommel einen vorgegebenen Mindestwert h_min aufweist;
3. (c) Bewegen der wässrigen Flüssigkeit während eines vorgegebenen Zeitraumes t_set > 1 min, in dem die Trommel in einem Ruhezustand ist oder so bewegt wird, dass keine Drehung der Trommel um einen Winkel α ≥ 180° stattfindet.

The invention thus relates to a method for treating items of laundry in a washing machine, which comprises a lye container, a drum for receiving items of laundry rotatably mounted in the lye container about a substantially horizontal axis, and a control device, the method comprising the following steps:

1. (A) introducing a laundry treatment agent containing open or closed container, in the drum;
2. (B) filling an aqueous liquid in the tub in an amount W, which is sufficient that the liquid level h in the drum has a predetermined minimum value h _min ;
3. (c) moving the aqueous liquid for a predetermined period of time t _set > 1 min, during which the drum is in a quiescent state or is moved so that there is no rotation of the drum through an angle α ≥ 180 °.

"Substantially horizontal" means that there may generally be deviations from the horizontal of up to 25%, preferably up to 15%.

The aqueous liquid is not restricted according to the invention. However, since these are to be used in the present invention for treating and especially for washing laundry, it will be as clean as possible water. Therefore, water from a water supply to the washing machine, i. E. Tap water, used. However, the aqueous liquid may also be, for example, rinsing liquid stored in the washing machine of e.g. act the last rinse.

The method step c) advantageously has the effect that no substantial redistribution of the items of laundry and of the container takes place within the drum. Thus, the container remains at a location within the drum at which the container can be repeatedly washed by the aqueous liquid. By the movement of the aqueous liquid or by flushing a friction is additionally generated on the container, which promotes a rapid dissolution of the container.

Preferably, the predetermined period of time t _{set is} in a range of 1.5 to 5 minutes. The period of time t _set is selected so that it is sufficient to substantially dissolve the container containing the laundry treatment agent and to distribute the laundry treatment agent in the aqueous liquid. Thus, it is advantageously achieved to provide the laundry treatment agent early in the washing process and substantially completely. Furthermore, it is avoided that residues of laundry treatment agent appear in a rinsing phase, which were not previously dissolved in the washing phase.

In a preferred embodiment of the method according to the invention, the washing machine has a pumping line and a pump which serves to convey an aqueous liquid (6), and in step (c) the aqueous liquid is moved by pumping through the pumping line. The pumping is generally done with a suitable pump. For this purpose, a pump which is used by the washing machine according to the invention and which serves to convey an aqueous liquid can also be used. By means of the pumping system, the already dissolved laundry treatment agent is thus advantageously distributed in the aqueous liquid. Furthermore, the circulating pumping also generates a movement of the aqueous liquid in the environment of the detergent pad. These effects thus support the rapid dissolution of containers containing the laundry treatment agent or of detergent pillows.

Preferably, in step b), the predetermined minimum value h _min is selected so that at least the drum comes into contact with the aqueous liquid or pumping around with the pumped circulation system is possible, wherein pumping requires that so much aqueous liquid is contained in the pumping system sufficient to return the liquid pumped out of the tub via the pumping line into the tub. With such a selected liquid level is advantageously ensured that the movement of the drum, which entrains the liquid when moving, or the operation of the pumped circulation system generates a movement of the aqueous liquid.

In particular, the container, which is introduced in step a) at a lower region of the drum, comes in contact with the liquid level predetermined in this way at an early stage. Preferably, the minimum value h _{min of} the liquid level is chosen such that it is above a container introduced in the lower part of the drum.

In an alternative or supplementary embodiment of the method according to the invention, in step (c), the drum is reversed with a predetermined amplitude A _T which is less than 180 °, preferably less than 150 °, more preferably less than 120 °, and in particular Range is from 70 ° to 110 °, wherein the amplitude A _{T is} the maximum deflection of the drum in degrees ("°") during a Reversierschrittes. In this case, it is again preferred that the drum is moved in step (c) at a speed which corresponds to a speed of the drum in the range of 25 to 35 revolutions / min. The speed should preferably be less than or equal to 50 revolutions / min. The maximum deflection of the drum is preferably dependent on the selected speed of the drum, wherein for a small amplitude A _T a low speed of the drum and for a high amplitude A _T a high speed can be selected. This has the advantage that the drive times for the drive motor are not too low or the drive motor does not have to provide too large drive torques in order to enable the otherwise required rotational acceleration of the drum.

Moreover, according to the invention, a method is preferred in which the drum is stationary during the filling of the aqueous liquid in step (b).

Also preferred is a method in which the amount of water W is selected as a function of a load L with the items of laundry, wherein a relationship between W and L is stored in the control device.

Finally, a method is also preferred in which the amount of movement in step (c) is selected as a function of a load L with the items of laundry, wherein a relationship between the amount of movement and L is stored in the control device.

In this case, the load L can be determined with items of laundry, for example by weighing the drum. Moreover, it is possible to determine the load L on the basis of the suction behavior of the laundry items in a wetting phase. In this method, in particular by using a pressure sensor, a hydrostatic pressure of the aqueous liquid is measured in the tub, which is a measure of the present as a "free liquor" in the tub aqueous liquid. The amount of free liquor will be less with the same addition of water in the tub when a comparatively large amount of laundry absorbs a relatively large proportion of the aqueous liquid. Based on this relationship, the amount of laundry can be determined, and the type of laundry may be considered. This can possibly be done by inputs of a user of the washing machine or by another determination of the type of laundry, for example by means of IR spectroscopy.

In this case, however, it should be noted that the method according to the invention generally overlaps with a wetting phase, so that the loading L can generally not be considered at the beginning, but only during the performance of the method according to the invention.

In a particularly preferred embodiment of the method according to the invention, the extent of the movement in step (c) comprises an amplitude A _T , with which the Drum is reversed, wherein the amplitude A _{T is} the maximum deflection of the drum in degrees during a Reversierschrittes.

Generally, a maximum allowable amount of movement in step (c) may be greater for larger loadings L with laundry.

In a preferred embodiment of the method according to the invention, in which the washing machine comprises a pumping line, the extent of the movement of the aqueous liquid in step (c) comprises a pumping rate of the aqueous liquid in the pumping line. This has the particular advantage that a movement of the liquid is also effected when the drum is stationary or is further intensified at a caused by the drum movement movement of the aqueous liquid. As a result, the container containing the laundry treatment agent can be dissolved even faster.

The open or closed container used in step (a) of the method according to the invention generally has the function of distributing treating agent contained in it in the aqueous liquid. As long as this function is fulfilled, the container is not restricted, so that the term "container" includes dimensionally stable containers as well as laundry bags. In the context of the invention, dimensionally stable containers are in particular open cups, the walls of which generally consist of a suitable sufficiently thick plastic material which is insoluble in an aqueous liquid, so that dimensional stability is ensured.

In a very particularly preferred embodiment of the method according to the invention, however, the container is a detergent pad which has at least one chamber which is enclosed by a water-soluble film, wherein the detergent pad in the chamber or chambers contains at least one liquid or powdered laundry treatment agent. The water-soluble film is made of, for example, a polyvinyl alcohol or a derivative thereof.

It is inventively preferred that the washing machine used in the method contains a treatment agent sensor for determining a concentration of the laundry treatment agent and in the process, the distribution of A laundry treating agent is traced from the container in the aqueous liquid using the treating agent sensor to determine a predetermined distribution of the laundry treating agent in the aqueous liquid. The "predetermined distribution" can be chosen so that all laundry treatment agent has been distributed from the container. When using a laundry bag, this means in particular that the water-soluble film has largely or completely dissolved, so that the laundry treatment agent contained in the chamber or chambers of the laundry bag could completely get into the aqueous liquid. As long as the treatment agent sensor can fulfill this function, it is not restricted according to the invention. It may be, for example, an electrochemical sensor or an optical sensor, since many laundry treatment agents are colored.

According to the invention it is preferred that in step (b) the filling of the aqueous liquid takes place via a cuff of the washing machine, i. the aqueous liquid is fed directly to the laundry. For example, therefore, the liquid can be passed through a waterway, which is connected to the cuff and preferably not passed over a dispenser. Alternatively, the waterway can also be passed through a prewash chamber of a dispenser tray. Thus, even in the case of a use error in the use of a detergent pad, namely, when the detergent pad was placed instead of under the laundry between or on the laundry, there located a detergent pad is reached by the aqueous liquid and the laundry treatment agent released after the dissolution of the film.

The inventive method can be added separately by a user of the washing machine on the operating unit. Thus, it is advantageously possible for the user to be able to select a washing program adapted to his laundry treatment agent. Alternatively, the method according to the invention can be integrated into washing programs which are particularly suitable for the case of the use of detergent cushions.

1. (a) Einbringen eines Wäschebehandlungsmittel enthaltenden offenen oder geschlossenen Behälters, in die Trommel;
2. (b) Einfüllen einer wässrigen Flüssigkeit in den Laugenbehälter in einer Menge W, die ausreicht, dass der Flüssigkeitsstand h in der Trommel einen vorgegebenen Mindestwert h_min aufweist;
3. (c) Bewegen der wässrigen Flüssigkeit während eines vorgegebenen Zeitraumes t_set > 1 min, in dem die Trommel in einem Ruhezustand ist oder so bewegt wird, dass keine Drehung der Trommel um einen Winkel α ≥ 180° stattfindet.

The invention also relates to a washing machine, which contains a tub, a tub in the tub around a substantially horizontal axis rotatably mounted drum for receiving laundry items and a control device, wherein the washing machine, in particular its control device, is arranged for carrying out a method for treating laundry items, comprising the following steps:

1. (A) introducing a laundry treatment agent containing open or closed container, in the drum;
2. (B) filling an aqueous liquid in the tub in an amount W, which is sufficient that the liquid level h in the drum has a predetermined minimum value h _min ;
3. (c) moving the aqueous liquid for a predetermined period of time t _set > 1 min, during which the drum is in a quiescent state or is moved so that there is no rotation of the drum through an angle α ≥ 180 °.

The washing machine can be a washing machine per se or a washer-dryer, ie a device which also has a drying device.

In a preferred embodiment, the washing machine comprises a pump for conveying an aqueous liquid and a pumping line. The pumping line is generally part of a pumping system, which also has a circulation pump. This can be the pump, which is also used for pumping and thus disposal of wash liquor. In this case, the operation of this pump would be suitably controlled, for example by means of a three-way valve, so that can be selected between pumping and pumping. However, in the washing machine of this embodiment according to the present invention, there may also be, for example, two pumps, one of which is used only in the pumping system, while the other pump is used only for pumping off used washing liquor or washing liquid.

The circulating pump provided in this embodiment of the invention is designed such that it can bring an aqueous liquid present in the tub in contact with the laundry items in the drum. In the method described herein, the pumping system essentially serves to distribute laundry treating agent in the aqueous liquid by, for example, assisting the dissolution of detergent pads. However, the pumping system will also be advantageous used in a washing phase, in which then an aqueous liquid containing generally detergent is repeatedly brought into contact with laundry to be cleaned.

A washing machine used herein also generally includes a heater and a liquor drain system with a drain pump located at the bottom of the tub. In addition, a washing machine used herein also generally includes laundry drippers and / or scooping devices.

In a preferred embodiment of the washing machine according to the invention, a temperature sensor is arranged in the tub. The temperature sensor is then arranged in a lower region of the tub, preferably in a designated as a radiator pocket portion of the tub container jacket, in which also generally the heater is placed.

The invention has the advantage that the distribution of laundry treatment agents in an aqueous liquid, which can then also be referred to as a wash liquor, is supported without the container containing it being moved too much and, for example, getting into a cuff of the washing machine. This is especially important when using laundry bags. It is supported in this case, the resolution of the laundry bag, so that by a rapid complete dissolution of the laundry bag, the retention of film residues in the cleaned laundry can be completely avoided.

Further details of the invention will become apparent from the following description of a non-limiting embodiment of a washing machine according to the invention, in which the inventive method can be performed. Here, reference is made to the FIG. 1 ,

FIG. 1 shows in particular a schematic representation of the invention essential parts of a suitable for carrying out the method according to the invention washing machine.

The schematically illustrated washing machine 1 contains in a tub 2 a rotatably mounted about a horizontal axis of rotation 18 drum 3 with laundry 4. The washing machine 1 further comprises a fresh water supply device, which consists of a controllable by the controller 7 valve 23 and a fresh water supply line 21. The fresh water supply line 21 is connected via a metering device 22 for laundry treatment agent, i. a dispensing tray 22, guided, so that in addition to an inventively provided addition of laundry treatment agent this can also be rinsed from the metering device 22 by means of fresh water supply via the fresh water supply line 21 into the tub 2. However, it is provided in the method according to the invention that the aqueous liquid, generally water, enters the drum 3 without prior contact with laundry treatment agent, be it via the dispenser bowl 22 or a sleeve of the washing machine 1, not shown here.

The drum 3 is driven by the drive motor 11. The drive motor 11 is in this non-limiting embodiment, a brushless and thus quiet operating drive motor 11th

The washing machine 1 further comprises a pumping system 5, 9, 14 consisting of a pumping line 9, a washing tub inlet 14 and a pump 5, which can also be labeled as a drain pump 5. By means of the circulating pump 5, 9, 14, an aqueous liquid 6, for example water, can be pumped through the suds pump 5 via the suds container outlet 10 out of the suds container 2 and returned to the suds container 2 via the recirculation line 9 and the suds container inlet 14. In this way, a circulation of the aqueous liquid 6 is made possible. This is in particular the implementation of step (c) of the method according to the invention, namely a movement of the aqueous liquid 6 during a predetermined period t _set > 1 min, in which the drum 3 is in a resting state or is moved so that no rotation of the drum 3 takes place by an angle α ≥ 180 °, possible.

The drain pump 5 is further connected to a sewer line 13 in the exemplary embodiment shown here. A controllable by the controller 7, not shown here, three-way valve allows this Embodiment, the switching of the pumping operation of the pumping system 5,9,14 on the sewer line 13. In this way, if necessary, aqueous liquid can be pumped out of the tub 2 and disposed of. However, it is also possible to use two pumps, so that in each case a separate pump is used for pumping over as well as for pumping off.

In a so-called radiator pocket 20 arranged in the tub 2, there are a heating device 15, a pressure sensor 16 and a temperature sensor 17.

Here, the pressure sensor 16 is a sensor for the measurement of the hydrostatic pressure in the tub 2. The hydrostatic pressure p results from the filling level h of the aqueous liquid 6 present in the tub 2 and in particular also in the radiator pocket 20. The pressure sensor 16 can according to the invention be used in particular for setting a predetermined water level h _min . In addition, as described herein, it may also be used to determine the loading L of the drum 3 with laundry 4.

Not shown is a balance for determining the amount of filled laundry, which alternatively allows an even better embodiment of the method according to the invention, but also a washing phase and a rinsing phase.

1. (a) Einbringen eines Wäschebehandlungsmittel enthaltenden offenen oder geschlossenen Behälters 8, in die Trommel 3;
2. (b) Einfüllen einer wässrigen Flüssigkeit 6 in den Laugenbehälter 2 in einer Menge W, die ausreicht, dass der Flüssigkeitsstand h in der Trommel 3 einen vorgegebenen Mindestwert h_min aufweist;
3. (c) Bewegen der wässrigen Flüssigkeit 6 während eines vorgegebenen Zeitraumes t_set > 1 min, in dem die Trommel 3 in einem Ruhezustand ist oder so bewegt wird, dass keine Drehung der Trommel 3 um einen Winkel α ≥ 180° stattfindet.

In the Fig. 1 Exemplary washing machine 1 shown allows the implementation of a method for treating laundry items 4, in which the following steps are carried out:

1. (A) introducing a laundry treatment agent containing open or closed container 8, in the drum 3;
2. (B) filling an aqueous liquid 6 in the tub 2 in an amount W, which is sufficient that the liquid level h in the drum 3 has a predetermined minimum value h _min ;
3. (c) moving the aqueous liquid 6 for a predetermined period t _set > 1 min, in which the drum 3 is in a resting state or is moved so that no rotation of the drum 3 by an angle α ≥ 180 ° takes place.

In the embodiment shown here, the closed container 8 is in particular a Detergent pad, which has at least one chamber enclosed by a water-soluble film, wherein the detergent pad in the chamber or chambers contains at least one liquid or powdered laundry treatment agent. Preferably, the container 8 and subsequently the laundry items 4 are placed in the drum 3 by a user first. Thus, the container 8 is located at a lower portion of the drum 3, which comes into contact with the introduced into the tub 2 aqueous liquid 6 for the first time. In the Fig. 1 is a liquid level of the aqueous liquid 6 indicated by the horizontal line shown within the drum, wherein the liquid level h is above the container 8. By moving the drum 3, the aqueous liquid 6 is entrained by the drum 3 and thus the aqueous liquid 6 is moved, which surrounds the container 8 located below in the drum 3.

The washing machine 1 makes it possible, in particular, for a reversing of the drum 3 with a predetermined amplitude A _T , which is smaller than 180 °, to be carried out in step (c), the amplitude A _{T being} the maximum deflection of the drum 3 in degrees during a Reversing step is. The movement of the drum 3 with an amplitude A _T , which is smaller than 180 °, is preferably ensured that no substantial redistribution of the laundry items 4 and the container 8 takes place within the drum 3. Thus, the container 8, in particular when reversing the drum 3, repeatedly washed by the aqueous liquid.

At the in Fig. 1 shown embodiment of a washing machine according to the invention, it is alternatively or in addition to the above variant for step (c) possible due to the existing pumping 9, that in step (c) the aqueous liquid 6 is moved by pumping through the pumping line 9.

The movement of the aqueous liquid 6 in the tub 2 is effected by the rotation or movement of the drum 3 and / or by operating the pumping system 5, 9, 14. As a result, the container 8 is flushed with the aqueous liquid 6 intensively, as a result of which the container 8 can dissolve quickly and the laundry treatment agent contained in the container 8 is introduced into the aqueous liquid 6.

reference numeral

1

Washing machine

2

tub

3

Drum, laundry drum

4

laundry

5

Lye pump, pump

6

Aqueous liquid

7

control device

8th

Washing pillows; closed container, containing laundry treatment agent

9

recirculating

10

Laugenbehälterauslass

11

drive motor

12

Treatment agent sensor

13

sewer

14

Lye container inlet of the pumping system

15

heater

16

pressure sensor

17

temperature sensor

18

axis of rotation

19

laundry agitator

20

radiators pocket

21

Fresh water supply line

22

Dosing device for treatment agent, Einspülschale

23

Valve

Claims (15)

Method for treating items of laundry (4) in a washing machine (1), which comprises a tub (2), a drum (3) rotatably mounted in the tub (2) about a substantially horizontal axis for receiving the items of laundry (4) and a control device (7), the method comprising the steps of: (A) introducing a laundry treatment agent containing open or closed container (8), in the drum (3); (B) filling an aqueous liquid (6) in the tub (2) in an amount W, which is sufficient that the liquid level h in the drum (3) has a predetermined minimum value h _min ; (c) moving the aqueous liquid (6) for a predetermined period of time t _set > 1 min, in which the drum (3) is in an idle state or is moved such that no rotation of the drum (3) by an angle α ≥ 180 ° takes place. A method according to claim 1, characterized in that the predetermined period t _{set is} in a range of 1.5 to 5 min. A method according to claim 1 or 2, characterized in that the washing machine (1) comprises a pump (5), which serves to convey an aqueous liquid (6), and a pumping line (9) and in step (c) the aqueous liquid Pumping through the pumping line (9) is moved. Method according to one of claims 1 to 3, characterized in that in step (c) reversing of the drum (3) is performed with a predetermined amplitude A _T , which is smaller than 180 °, wherein the amplitude A _T, the maximum deflection of the Drum (3) is in degrees during a reversing step. A method according to claim 4, characterized in that the drum (3) is moved in step (c) at a speed of less than or equal to 50 revolutions / min. Method according to one of claims 1 to 5, characterized in that the drum (3) during the filling of the aqueous liquid (6) in step (b) is stationary. Method according to one of claims 1 to 6, characterized in that the amount of water W is selected as a function of a load L with the laundry items (4), wherein in the control device (7) a relationship between W and L is deposited. Method according to one of claims 1 to 7, characterized in that the amount of movement in step (c) is selected as a function of a load L with the laundry items (4), wherein in the control device (7) a relationship between the extent of Moving and L is deposited. A method according to claim 8, characterized in that the amount of movement in step (c) comprises an amplitude A _T at which the drum (3) is reversed, the amplitude A _{T being} the maximum deflection of the drum in degrees during a reversing step is. A method according to claim 8 or 9, characterized in that the washing machine (1) comprises a pumping line (9) and the extent of moving the aqueous liquid in step (c) comprises a pumping rate of the aqueous liquid (6) in the pumping line (9) , Method according to one of claims 1 to 10, characterized in that the detergent container (8) is a detergent pad having at least one chamber which is enclosed by a water-soluble film, wherein the detergent pad (8) in the chamber or chambers at least one liquid or powdered laundry treatment agent. Method according to one of claims 1 to 11, characterized in that the washing machine (1) contains a treatment agent sensor (12) for determining a concentration of the laundry treatment agent, and in the method, the distribution of the laundry treatment agent from the container (8) in the aqueous liquid (6 ) is tracked by the treating agent sensor (12) to determine a predetermined distribution of the laundry treating agent in the aqueous liquid (6). Method according to one of claims 1 to 12, characterized in that in step (b), the filling of the aqueous liquid (6) via a sleeve of the washing machine (1). A washing machine, which has a tub (2), a drum (3) rotatably mounted in the tub (2) about a substantially horizontal axis for receiving laundry items (4), and a control device (7), characterized in that they are used to carry out a Method for treating laundry items (4) is set up, which comprises the following steps: (A) introducing a laundry treatment agent containing open or closed container (8), in the drum (3); (B) filling an aqueous liquid (6) in the tub (2) in an amount W, which is sufficient that the liquid level h in the drum (3) has a predetermined minimum value h _min ; (c) moving the aqueous liquid (6) for a predetermined period of time t _set > 1 min, in which the drum (3) is in an idle state or is moved such that no rotation of the drum (3) by an angle α ≥ 180 ° takes place. Washing machine (1) according to claim 14, characterized in that it comprises a pump (5) serving to convey an aqueous liquid (6) and a pumping line (9).

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