DE10060998C1 - Valve for food storage container has opening tab with suction aperture and smooth edging for sealing lip of suction connector of vacuum pump - Google Patents

Abstract

The valve (1) for the storage container (15) has a connecting device (9) on the opening tap, which has one or more suction apertures. On the outer side of the opening tab there is a smooth all-round edging (18) to receive the sealing lip of the suction connector of a vacuum pump. There may be a sealing tongue acting as a no-return valve between the venting aperture and the opening tab.

Description

The invention relates to a storage container for food and a method for evacuating a food storage container.

Systems for the preservation of food are already known, the one preserve allow under better conditions than if the food is untreated or kept without improved storage conditions. A way to verbes Storage of food concerns the storage of food in Containers under vacuum. Such systems have been shown to produce very good results avoiding some microorganisms, vermin, mold and yeast wax bring forth tum. This also prevents the oxidation of food, avoiding changes in the moisture and aroma of the food can be.

Lids for storage containers for food are already from the prior art medium known, in which to equalize pressure during the warm-up process in a Mi a ventilation or ventilation valve is provided in the container lid.

EP 0 633 196 A2 describes such a mechanism. In it the task should be ge solves, the build-up of excess pressure inside the container of storage containers for Prevent foods that are warmed up in a microwave. this happens mostly when there are aqueous liquids in the interior of the container Vaporizing heating and thereby building up an overpressure inside the container. This is especially disadvantageous when opening the container lid, as this would result in sauces or otherwise Suddenly squirt out food ingredients when opening the lid. To the For this purpose, EP 0 633 196 A2 proposes a vent valve in the lid of the storage tion container for food, which before the container is inserted into the Microwave oven to be opened. Which then arise during the warm-up process de Water vapor can escape unhindered without a corresponding Vapor pressure builds up inside the sealed container.  

EP 0 820 939 A1 is also based on the task of building up excess pressure in the Container interior of food storage containers in a microwave to be warmed up, d. H. here is a vent for storage Food storage containers are made available to those stored therein Food is safely opened in a microwave oven with the container lid closed to be able to warm. In contrast to EP 0 633 196 A2, however, a valve mechanism mus described, which can be opened via a joint like a seesaw. So le diglich pushing the rocker arm required, which simply opens the valve leaves.

WO 88/00560 A1 describes an opening mechanism for a beverage can from Pla stik. First of all, pressure equalization is to be achieved by opening a ventilation valve create, which then opening or pulling the entire deck ice should be facilitated. According to the task, these are always plastic lids, because the use of metal lids is to be prevented. In particular, it plays the pressure equalization of excess pressure inside the container, for example by using Carbonated drinks are created, a role.

Furthermore, US 3,737,066 discloses a container, which is preferably used for storing Liquids is meant, the side walls of which are made of coated cardboard material are and the floor and ceiling elements are made of plastic plates that with the Cardboard walls are connected liquid-tight. The upper plastic lid has egg a reclosable opening mechanism, which is also made of plastic and is positively connected to the cover via holding pins. Ventilation before Opening the container lid or a device for pressure compensation is not provided.

CH 304 374 discloses a closure lid for an aluminum sterilization vessel which formed essentially circular and on a cylindrical aluminum container is put on. There is a rubber seal between the edge of the lid and the top of the container tion hung up. There is an additional opening in the middle of the container lid, which is covered by a rubber cap. The rubber cap is used for visual inspection, to indicate whether there is a vacuum inside the container. As long as an ent speaking vacuum inside the container, the rubber cover bulges cap inside accordingly. As the vacuum diminishes, this curvature is continuous  to. It is therefore difficult for the observer to decide whether the inside of the The existing vacuum is still sufficient to keep the food fresh ensure inside the container.

US 5,195,427 and WO 97/17259 A1 each describe vacuum pumps for evacuation storage containers for food. In doing so, each becomes conical suction tips into corresponding valve openings on the container lid of the storage container introduced.

EP 0 234 607 B1 describes a bottle cap which also serves as a vent valve is formed. A cylindrical vacuum pump is used, which the protruding cylindrical shaft of the bottle cap completely includes.

EP 0 644 128 A1 describes a sealable container which is operated by a vacuum pump can be evacuated. It discloses a check valve that in a cylindrical gene recess in the container lid and in the suction opening of a vacuum pump is introduced.

From DE 74 09 380 U a storage container for food is known, the Filling opening can be closed by a lid. The lid has a vent in the center tion opening, which can be closed by a valve member. The valve member has an opening Opening tab on which the valve member is lifted from the vent and thus the vacuum in the storage container can be released. One in progress Vacuum container to be formed is closed valve by cooling the food is reached after cooking.

From DE 28 21 852 A1 there is also a storage container of the type mentioned at the beginning Art known, which can be closed airtight by a valve provided with a lid. The valve is arranged in the center of the cover and is connected by an annular connection device surrounded on which a vacuum pump for venting the food space of the Storage container is attachable. To open the storage container, the Valve disc can be lifted from the sealing edge formed on the cover, which in turn can be done that an operator with a knife or other sharp object  reaches under the valve plate and pushes it upwards. Such an opening mechanism is relatively difficult to operate.

The present invention has for its object an improved storage tion container for food with a connection device for evacuating the Aufbe to provide a currency container. The evacuation of the container and it can then be easily opened.

This task is accomplished by a food storage container with the Merk paint claim 1 and a method for evacuating a storage space container for food with the features of claim 11 solved. Beneficial Embodiments of the invention are described in the subclaims.

The storage container according to the invention with a valve device according to Patentan saying 1 has the advantage that it is simple and inexpensive to manufacture. Furthermore, is on centering the vacuum due to the design of the connection device pump not required. In particular, a device with a running sealing lip, which acts like a suction cup, are used. For such Suction devices, it is important that the suction surface of the sealing lip has no structure points so that the suction power completely evacuates the storage container can. In addition, the suction opening can egg within the smooth peripheral edge have any cross-section. It can also run in a wave shape in a circle tig is only that then the circumferential sealing lip of the suction device this course is adapted to establish a tight connection. By the invention in a vacuum the second embodiment of the opening tab from the motor-driven Va pump pressed against the foot portion of the sealing tongue and a pressure indicator, see above that a tight valve device is created and at the same time the pressure indicator is clearly visible. In the first embodiment, the opening tab presses against the holding member that again press the seal securely against the container lid. Here too the pressure is show clearly legible.

An advantageous embodiment of the present invention provides the features of the Pa claim 2 before. This makes an integrated component with few individual parts Provided. As soon as the storage container is evacuated, the sealing effect takes place  automatically by the fact that the sealing tongue on the vent in the container lid opening is sucked in.

Another advantageous embodiment of the invention provides the features of the patent pronounces 3. This embodiment represents a surprisingly simple constructive solution solution for easy opening of the container lid is available, as it is first opened Abge the opening tab over the driver, the sealing tongue from the vent is raised. This ensures pressure equalization between the inside of the container and the Environment instead. The container lid is now no longer from the negative pressure inside the Storage container sucked in and can be easily lifted off. The valve forward direction fulfills several functions.

Another advantageous embodiment of the present invention has the features of Claim 4 on. This simplifies the evacuation process, because for the The operator can immediately see when there is sufficient negative pressure in the storage container ter is reached. By integrating this feature into the valve device, a construction part created with multiple functions.

An advantageous development of the embodiment according to claim 4 sees the features of claim 5 before. The design described therein provides an optical and  tactile pressure indicator available. The optical effect of the for example, made of elastomeric plastic material by corre sponding Increase the appropriate color design in a signal color. Depending on how far the print Kindikator with appropriate pressure conditions on the outer contour of the valve device protrudes or disappears in it, a corresponding haptic effect can be achieved achieve, which also allows visually impaired users the pressure inside the Capture storage container.

Another advantageous development of the embodiment according to claim 5 sees the Merk male of claim 6 before. This ensures a clear signal position of the print dikators reached. At ambient pressure in the storage container, the membrane of the Pressure indicator clearly outward. When a predefined vacuum is reached inside the container, the membrane "snaps" inwards. With appropriate selection The spring ensures that the diaphragm is exceeded when a minimum vacuum is exceeded snaps back to its original position in the storage container, d. H. there is only two clear pressure indicator positions: sufficient negative pressure in the storage area container (pressure indicator snapped) / insufficient vacuum or ambient pressure (pressure indicator is in its initial position). The spring element can thereby, for example, by appropriate selection of a resilient plastic mat rials for the membrane of the pressure indicator or by inserting a spring metal into the Membrane of the pressure indicator can be formed.

A further advantageous embodiment of the invention sees the features of the patent pronounces 7. This makes it possible to store the container and its contents in one Store the freezer and then defrost it in a microwave oven. For the Warming up in the microwave oven can be the vent as already be wrote about the opening tab to be opened. Possible materials are poly propylene and polyamide as well as any other thermally stable and tasteless Plastic material.

Another advantageous embodiment of the present invention provides the features of Claim 8 before. A material is preferably chosen that is sufficient stiffness and the required sealing properties. This component  can be manufactured inexpensively as an injection molded component and is easy to store can be mounted.

An alternative embodiment provides the features of claim 9. Hereby can the container lid and the opening tab as a common injection molded part put. For the sealing tongue and the membaran of the pressure indicator, an elastic ela Stomer plastic or rubber material are used, which is then in the Be container lid and opening tab formed component is inserted. Another advantage lies in that the opening tab not only serves to open the vent opening, but also The entire container lid can also be lifted off via the film hinge.

Finally, another advantageous embodiment of the present invention provides that Features of claim 10 before. The flexible arrangement and uni is advantageous Versatile usability of the valve device together with storage containers for Nah resources.

An advantageous method for evacuating a food storage container medium provides the features of claim 11. Here is the procedure described easy and quick to do. Due to the low requirements that the process requires the user, it is particularly suitable for the household sector. In particular is advantageous that due to the combination of the connection device with a smooth edge and of the suction connection with all-round sealing lip no complex centering in front of the Evacuation process is required.

An advantageous development of the method is described in claim 12.

Further embodiments and advantages of the invention will become apparent from the description of the Exemplary embodiments explained with reference to the accompanying drawings. In this demonstrate:

Fig. 1 is a schematic sectional view of a first embodiment of a storage bo preserving container for food having a first valve means in a container lid,

Fig. 2 is a schematic sectional view of the valve device with the pressure indicator of FIG. 1 wherein a sufficient vacuum in the storage container be,

Fig. 3 shows the valve device according to Fig. 1, however, so that there is after the release of the vent opening by the opening tab in the storage container again atmo spheric pressure,

Fig. 4 is a partially cutaway perspective view of a second exporting approximate shape of a storage container for food having a second valve means, wherein said pressure indicator that position has taken, is present in a sufficient vacuum in the storage container,

Fig. 5 as Fig. 4, but with the opening flap pivoted upwards to release the vent opening, so that pressure equalization can be produced in the storage container and

Fig. 6 is a perspective view of a storage container for food having a pressure indicator in accordance with Fig. 4.

The following are the same or similar components with the same loading for the sake of simplicity marked with a train sign. To avoid repetitions, positions are the same assign the same functions and modes of operation to numbers.

Figs. 1 to 3 show a schematic cross-sectional representation of a first execution form of a pressure indicator 6 for a storage container 15 (FIG. 4) for Nahrungsmit tel. Referring to FIGS. 1 to 6 of the pressure indicator 6 is provided with a valve device 1-jointed, which is attached to a container lid 2. An opening tab 7 is integrally connected to the container lid 2 via a film hinge 32 . The opening tab 7 and the container lid 2 are made as an injection molded component from temperature-resistant thermoplastic. The in plan view substantially formed as an oval plate opening tab 7 has a connection device 9 for a suction connection of a vacuum pump PE, which is essentially formed by a smooth annular surface 18 on the outside 24 of the opening plate 7 and one or more suction openings 17 within the annular surface 18 becomes. Such a device is described in the patent application filed on the same day by the applicant, which is entitled "Device for evacuating food storage containers" and which bears the internal company number 06499-PZ10 / Ha. This article is referred to here in full and it may also be the subject of this application.

At the bottom of the opening tab 7 1 to 6 direction below the Anschlußein 9 is arranged a sealing tab 3 of elastomeric plastic in FIGS.. The sealing tongue 3 is fastened in the first exemplary embodiment in FIGS . 1 to 3 via an annular web 19 to the opening tab 7 and is designed as a disc-shaped component. The web 19 has an air passage 30 .

The opening tab 7 is inserted in FIGS. 1 to 6 in a corresponding to the opening flap 7 adapted substantially rectangular recess 20 in the container lid 2 of the container 15 maintaining stor. Under the connecting device 9 of the opening tab 7 and the sealing tongue 3 , a vent opening 4 is provided in the container lid 2 . In the open state, the vent 4 creates the connection between the atmosphere and the interior 22 of the storage container 15 . In the closed state, the ventilation opening 4 is closed airtight by the sealing tongue 3 . The vent opening 4 forms with the sealing tongue 3 a check valve 40 closing in the direction of the storage container 15 .

In addition to the ventilation opening 4 , a measuring opening 5 in the container terdeckel 2 is arranged according to FIGS . 1 to 6. The measuring opening 5 is covered from the environment by a plastic membrane 29 of the pressure indicator 6 from above airtight. The pressure indicator 6 extends essentially perpendicular to the plane of the container lid 2 upwards and, according to FIGS. 1, 3, 4 and 5, in the improperly vacuum-sealed state, has a substantially cup-shaped, slightly curved side wall 23 which extends upwards tapers and closes with a horizontally extending circular bottom 24 . The diameter D of the base 24 is smaller than the diameter d of the opening 25 at the foot section 25 of the pressure indicator 6 , as shown in particular in FIG. 4. By the described design of the pressure indicator 6 , when vacuum is applied, the side wall 23 of the pressure indicator 6 extends into its cavity 26 in a manner similar to that of a rolling membrane, as shown in FIG. 2.

In the opening tab 7 of the Druckindi 6 1 is shown in FIGS. To 6 in the place kators a display opening 8, through which the pressure indicator 6 on the Au ßenseite perpendicular 33 of the opening tab 7 projecting extends when located in the interior 22 of the storage bo preserving container 15 insufficient vacuum is located. The pressure indicator 6 is made of egg nem elastomeric plastic and preferably in a signal color, in the present case in red color. On the inside of the pressure indicator 6 according to FIGS. Stiffened 1 to 3 by a spring member 12, preferably made of a resilient material such as spring metal or elastomeric plastic, is and flat against the inner side 34 of the pressure indicator 6 is applied.

At the right in FIGS . 1 to 6 the free end of the part of the opening tab 7 near the edge has an actuating surface 10 . The end of the opening tab 7 , starting from the folding edge 35 , is slightly beveled upwards. The container lid 2 has the recess 20 so that, as the opening tab 7 by means of ribs 29, 36 of the recess is spaced 20 from the floor 37, the actuating surface 10 of the opening tab 7 easy Zvi's finger and thumb of a (not shown) user manual gripped and can be pulled up.

In FIGS. 1 to 3, a bracket 11 is shown, the rial, the elastomeric plastic mate the flat foot portion 25 of the pressure indicator 6 presses onto the container lid 2. The bracket 11 is supported on the walls of the container lid 2, not shown in the drawing. In Figs. 1 to 3 that is, the cup-shaped pressure indicator 6 is eintei lig connected to the foot portion 25, so that in the clamped state by the holding stirrup 11 of the pressure indicator 6 is sealingly connected to the container lid 2.

FIGS. 4 to 6 show a partially sectioned perspective view of a second embodiment of a valve device 1 according to the invention with the Druckindi er 6 for a storage container 15 for food. Also in this embodiment, the opening tab 7 is integrally connected to the container lid 2 via the film array 32 . The sealing tongue 3 arranged under the connecting device 9 of the opening tab 7 is connected to the opening tab 7 via a driver 13 . Both the sealing tongue 3 as the driver 13 , the foot portion 25 and the pressure indicator 6 are made from a single elastomeric plastic part which is attached as an insert to a bead 21 in the recess 20 of the container lid 2 . The used for the pressure indicator 6 plastic material has spring properties, so that the said snap effect on the pressure indicator 6 occurs when either too little or sufficient vacuum is present.

The difference of the first embodiment according to FIGS. 1 to 3 to the second imple mentation form according to FIGS . 4 to 6 essentially consists in the fact that in FIGS . 1 to 3 the sealing tongue 3 forms its own sealing part with respect to the pressure indicator 6 , while however, in the second embodiment according to FIGS. 4 to 6 these parts are formed by a single elastomeric component, the sealing tongue 3 of which is partially cut out of the foot section 25 and thus forms a gap 28 .

Furthermore, a circumferential seal 14 is provided at the edge of the container lid 2 according to FIGS. 4 and 5, which enables an airtight closure relative to the storage container 15 . However, it is also conceivable not to use a seal 14 , as shown in FIGS. 1 to 3, so that the lid 2 itself forms a tight seal with the storage container 15 . In the closed state of the valve device 1 , the foot part 25 is pressed by the circumferential rib 29 against the bottom 37 of the container lid 2 and thus sealed.

In the illustration in FIGS. 1 and 3 to 6, the pressure inside the container 22 of the storage case 15 corresponds to the ambient pressure. The pressure indicator 6 therefore protrudes from the outside due to its spring preload through the display opening 8 via the opening tab 7 .

In the illustration according to FIG. 2, there is a sufficient negative pressure in the interior 22 of the storage container 15 . The pressure indicator 6 is therefore sucked in the direction of the container interior 22 into its cavity 26 ; it is in the folded or snapped state. In this state, the pressure indicator 6 does not or only insignificantly protrudes beyond the outer contour of the opening tab 7 . The pressure indicator 6 folds like a rolling membrane. The ratio of the diameter D to d as a function of the wall thickness f and the elastic material of the pressure indicator 6 is chosen such that the pressure indicator 6 folds up suddenly from a certain negative pressure, as shown in FIG. 2. If the vacuum in the interior of the container 22 decreases, a point is also reached here where the pressure indicator 6 suddenly moves outwards. This has the advantage of a clear display.

The two exemplary embodiments work as follows:

When used in a household, the user can first use the position of the pressure indicator 6 with the container lid 2 closed to find out about the pressure in the interior 22 of the container . If the bottom of the pressure indicator 6 protrudes through the display opening 8 to the outside, this means that the pressure inside the container 22 is not sufficient to ensure the storage of food under vacuum conditions (see FIGS. 1, 4 and 6).

Now the storage container 15 is evacuated according to FIGS. 1, 3 and 6. In the evacuation process, a suction connection with a circumferential sealing lip of a vacuum pump (not shown) is placed on the connection device 9 of the valve device 1 . Then the vacuum pump is started. This automatically opens the ventilation opening 4 of the valve device 1 , since the suction effect allows the sealing tongue 3 to be lifted off the ventilation opening 4 and the air contained in the storage container 15 is sucked out of the vacuum pump. According to FIG. 1, air is sucked in laterally via the ventilation opening 4 at the sealing seat 38 of the sealing tongue 3 , around the sealing tongue 3 around the outside, through the air passage 30 and via the connection device 9 to the vacuum pump. When a sufficient negative pressure is reached in the space 22 of the storage container 15 , the pressure indicator 6 snaps inward suddenly ( FIG. 2). This informs the user that he can end the evacuation process. After lifting the Va kuumpumpe from the connection device 9 , the sealing tongue on the edge of the vent opening 3 is pressed, whereby this is automatically sealed airtight. This occurs before each return stroke of the vacuum pump, so that a vacuum can be built up in the interior 22 . The vacuum in the interior 22 now keeps the food there fresh for a long time, since the lack of oxygen prevents oxidation of the food.

In order to be able to take fresh food out of the storage container 15 , one grips with two fingers under the actuating surface 10 and swivels the opening tab 7 counterclockwise in FIG. 5 with little force. In this case of FIG. 3 is lifted by the opening tab 7, the sealing tab 3 via the webs 19 from the sealing seat 38 upwardly and releasing the vent 4. In the embodiment of Fig. 5, the upper side of the opening tab 7 at the bottom of first proposes an integrally formed on the carrier 13 brim 27 and pulls the carrier 13 with the sealing tab 3 so long up until the sealing tongue 3 from the sealing seat 38 lifts and counterclockwise Clockwise swivels upwards ( Fig. 5). Air can now flow in accordance with FIGS . 1 to 5 via the suction opening 17 of the connection device 9 and the vent opening 4 into the container interior 22 .

The container lid 2 can now be removed from the storage container 15 without any significant effort. Since the sealing tongue 3 according to FIGS . 4 and 5 is partially separated from the rest of the flat foot part 25 by the essentially U-shaped gap 28 , it is therefore only connected in the left rear area 39 with the rest of the foot section 25 , due to its gravity, it always falls as a check valve on the vent 4 , so that vacuuming is not a problem. But it is also conceivable that the opening tab 7 can be snapped onto the container lid 2 by means of clip connections, so that in the closed state the sealing tongue 3 thereby closes the vent opening 4 . In Fig. 3, when the opening tab 7 is pivoted around the film hinge 32, the sealing tongue 3 is lifted upwards because it is attached to the opening tab 7 to fulfill the check valve function with play.

Fig. 6 shows a perspective view of a thermoplastic synthetic material manufactured in, storage container 15 for food having a valve device 1 according to Fig. 4. The storage container 15 in this case has a cuboid container body 16 and a rectangular in plan view essentially container lid 2 formed with at operating brim 27 on. On one of the narrow sides of the container lid 2 , the Ventilvor device 1 is arranged in a recess 20 . The actuating surface 10 of the opening tab 7 closes approximately with the outer surface 33 of the container lid 2 . Only the pressure indicator 6 protrudes vertically upwards in the event of insufficient vacuum from the display opening 8 of the opening tab 7 . In the direction of the inside of the container lid 22 , in addition to the pressure indicator 6, the circular connection device 9 with the smooth annular surface 18 and the suction opening 17 can be seen, from which the driver 13 projects with its brim 27 . The brim 27 serves to better carry the driver 13 when the opening tab 7 is pivoted upwards. Due to the leverage that is formed by the distances R and r ( FIG. 5), a relatively small hand force F ( FIG. 4) on the gripping surface 10 is sufficient to lift the sealing tongue 3 from the sealing seat 38 when there is still vacuum inside the container 22 is available. The smaller the distance r and the greater the distance R, the easier it is to open the valve device 1 .

Claims (12)

1. Storage container ( 15 ) for food with a valve ( 1 ) provided with a vent ( 4 ), the storage container ( 15 ) being airtight and closable and in the area of the vent ( 4 ) a connection device ( 9 ) for a vacuum pump Evacuating its interior ( 22 ), which is formed on a pivotably mounted opening tab ( 7 ) for the valve ( 1 ), the opening tab ( 7 ) in the area of the vent opening ( 4 ) a suction opening ( 17 ) and on the outside Side has a substantially smooth peripheral edge ( 18 ) for receiving a sealing lip of a suction port for the vacuum pump. 2. Storage container according to claim 1, characterized in that between the vent opening ( 4 ) and the opening tab ( 7 ) a sealing tongue ( 3 ) is provided, which acts as a check valve. 3. Storage container according to claim 1 or 2, characterized in that the opening tab ( 7 ) has a driver ( 13 , 19 ) which, when the opening tab ( 7 ) is pivoted, lifts the sealing tongue ( 3 ) from the vent opening ( 4 ). 4. Storage container according to one of the preceding claims, characterized in that a pressure indicator ( 6 ) is provided on the valve ( 1 ). 5. Storage container according to claim 4, characterized in that the pressure indicator ( 6 ) is designed as a dome-shaped membrane. 6. Storage container according to claim 5, characterized in that the membrane of the pressure indicator ( 6 ) has a spring element ( 12 ), so that the pressure indicator ( 6 ) snaps back into its initial position at a predetermined pressure. 7. Storage container according to one of the preceding claims, characterized in that the valve ( 1 ) is made of plastic material which are suitable for a Temperaturbe range of -40 ° C to + 100 ° C. 8. Storage container according to one of the preceding claims, characterized in that the valve ( 1 ) is made as a one-piece component. 9. Storage container according to one of claims 1 to 7, characterized in that the opening tab ( 7 ) via a film hinge ( 32 ) is integrally connected to the container lid ( 2 ) of the storage container ( 15 ). 10. Storage container according to one of the preceding claims, characterized in that the valve ( 1 ) on the container lid ( 2 ) or on the container body ( 16 ) of the storage container ( 15 ) is arranged. 11. A method for evacuating a storage container for foodstuffs, an attachment with a vacuum pump being attached to a hand mixer or a hand mixer, and a valve being attached to the storage container, the method comprising the following steps:

• - Placing the attachment on a connection device of the valve;
• - Activate the hand mixer or hand mixer so that the vacuum pump of the attachment is started up;
• - Automatic opening of the valve by the suction effect of the attachment, where the air contained in the storage container is extracted;
• - Automatic closing of the valve after the vacuum pump has been switched off.

12. The method according to claim 11, characterized, that before the process steps for evacuating the vacuum pump as an attachment is attached to the hand mixer or hand mixer.