Patent Application
20190293342
The invention relates to a crisper for storing food. In particular, the invention relates to a crisper for storing food with a controlled humidity.
When preserving food, the food to be preserved can be placed in a container having a controlled environment. Typically, a refrigerator can be provided with a crisper. The crisper is a box used to keep fruits and vegetables stored in an environment where the humidity favors the preservation of the fruits and vegetables.
Most fruits and vegetables prefer to have high humidity environment. One way to obtain a high humidity is to provide a sealed crisper. However, as has been realized condensation might build up in a high humidity environment. Such excess condensation can promote the decay of certain fruits and vegetables through physical or microbiological damage.
There is a constant desire to improve storage and preservation of food. Hence there exists a need for an improved crisper.
It is an object of the present invention is to provide an improved crisper.
This object is obtained by a crisper as set out in the appended claims.
In accordance with one embodiment a crisper for preservation of food is provided. The crisper comprises a box and a top. When the crisper is in a closed position the box is air tight sealed to the top. The crisper comprises a humidity control unit adapted to allow humid air to exit the crisper via a humidity control membrane located in the humidity control unit. Hereby, the humidity inside the crisper can be controlled by proper selection of the membrane and no further control is required to keep a proper humidity level inside the crisper which is otherwise sealed from the surroundings.
In accordance with one embodiment the box is arranged as a drawer slidably insertable under the top. Hereby a sealable crisper drawer is provided that air tight to provide good preservation of food stored therein.
In accordance with one embodiment the box comprises a gasket on the front side of the box. The gasket can be visible from the outside when the crisper is in a closed position. For example, the gasket can extend to cover a part of the outside of the front side of the box. Hereby, a sealing member that is easy to inspect is provided. As an alternative or as a supplement a gasket can be provided on the front side of the top. The gasket can also be visible from the outside when the crisper is in a closed position.
In accordance with one embodiment the humidity control unit is located in the top. Hereby, the humidity control unit is easily accessible for service and maintenance. For example, for access of the humidity control membrane. Alternatively, the humidity control unit can be located in the box.
In accordance with one embodiment the crisper comprises two boxes. The boxes can then be separate and have different characteristics and be used for storing different type of food. In particular, each of the two boxes can have a separate humidity control unit.
In accordance with one embodiment the humidity control membrane is a Tyvek membrane. Hereby a robust humidity control membrane that is easy to handle and manufacture is provided at the same time as a good humidity control is achieved. The humidity control membrane can have a size of 5-10 cm2 per liter of crisper volume.
In accordance with one embodiment, the humidity control unit has a liftable upper grid member at a top section of the humidity control unit. The humidity control membrane is located directly underneath the liftable upper grid member. Hereby the humidity control membrane can be easily removed for exchange or cleaning.
In accordance with one embodiment a replaceable membrane used in a crisper for preservation of food is provided. The crisper comprises a box and a top. When the crisper is in a closed position, the box is air tight sealed to the top. The membrane has a size of 5-10 cm2 per liter of crisper volume. Hereby a controlled humidity inside the crisper can be obtained. The membrane can be a Tyvek membrane.
The invention will now be described in more detail, by way of example, and with reference to the accompanying drawings, in which:
The invention will now be described more fully hereinafter with reference to the accompanying drawings, in which certain embodiments of the invention are shown. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided by way of example so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. For examples like or similar components of different embodiments can be exchanged between different embodiments. Some components can be omitted from different embodiments. Like numbers refer to like elements throughout the description.
Most fruits and vegetables prefer to have high humidity environment. A sealed crisper is one solution to maintain high humidity. However, condensation might build up in a high humidity environment. This excess condensation might promote the decay of certain fruits and vegetables through physical or microbiological damage. Thus, an introduction of humidity control that allows the excess water vapor to vent through is desired.
In the closed position the crisper is sealed in the sense that there is an air tight sealing between the box 12 and the top 14. To ensure an air tight sealing between the box 12 and the top 14, a gasket 18 can be provided on either the front section 20 or the front section of the top 14 or both. In accordance with one embodiment the gasket 18 is formed around the edge of the front section 20 and/or the front section of the top 14 such that the sealing is visible from the outside when the crisper is in a closed position. Hereby the robustness of the sealing facing a user is improved. Also, a user can more easily spot if the gasket 18 is damaged, missing or misaligned thereby impairing the function of the sealed crisper 10. The gasket 18 can be arranged to enclose the front section of the top 14 as is better seen in
The crisper 10 further comprises an automatic humidity control unit 16. The 30 automatic humidity control unit 16 is adapted to automatically let some humidity out from the crisper 10 when the crisper is in a closed position as will be explained in more detail below.
The crisper 10 is designed with minimum air exchange. This is achieved by providing an air tight seal between the box 12 and the top 14 when the crisper 10 is in a closed position. This sealed crisper is capable to get to the optimum storage environment that is needed by the fruits and/or vegetables as quickly as possible. This optimum storage environment is provided by a very low air flow inside crisper and optimum relative humidity. Fruits and vegetables stay fresh, tasty, and crisp.
To control the humidity inside the sealed crisper 10 humid air is allowed to exit the crisper via the automatic humidity control unit 16 where the humidity control unit comprises a humidity control membrane.
In
The crisper is typically placed in a refrigerator. The refrigerator cavity (outside of crisper) has very low relative humidity, while the sealed crisper filled with fruits/vegetables has high relative humidity. This creates vapor pressure gradient across the membrane 26. Over time, some water vapor from sealed crisper will be released to the dry refrigerator cavity thereby automatically controlling the humidity in the crisper 10.
The humidity control can be said to be automatic because the humidity in the crisper 10 does not need any consumer input. Depending on what fruits/vegetables inside the sealed crisper, relative humidity inside the crisper automatically changes. This will affect the vapor pressure gradient across the membrane 26. If the crisper is filled with leafy vegetables that creates very high relative humidity (>90%), more water vapor is transported across the membrane 26. If the crisper is filled with fruits which create medium relative humidity (75-90%), not as much water vapor is transported. By letting gases out from an otherwise sealed crisper via a membrane, the relative humidity of the crisper is reduced by 3-5%. With this reduction, condensation risk is minimized, which is advantageous because condensation is typically not desired.
The membrane can be any suitable type of membrane allowing humid gases to pass at a pre-determined rate at a set humidity pressure gradient. One membrane that can be used is a Tyvek membrane. The membrane is made of spun PE threads which is pressed to form sheets. In accordance with one embodiment, Tyvek 1056D is used. Such a material is difficult to tear thereby improving the robustness of the membrane. The size of the membrane should be designed to match the required level of humidity desired in the crisper.
In accordance with one embodiment the size is set to between 5-10 cm2 per liter of crisper volume, and in particular 6-8 cm2 per liter of crisper volume. In accordance with one embodiment a Tyvek 1056 D membrane having the size 7 cm2 per liter of crisper volume can be used.
In
In
The crisper as described herein has numerous advantages. The crisper is sealed whereby a high humidity in the crisper is obtained. This is advantageous because higher humidity is good for the quality preservation of fruits and vegetables. Further excess condensation on sealed crisper might be a problem that reduce the quality of produce (water that rolls down might pick up some of the unwanted microorganism and increase decay on fruits and vegetables). This is counteracted by the use of membrane provided in the crisper to control opening to let some of the excess humidity to escape to the drier fridge cavity. Hereby, the conditions inside the crisper is humid enough for optimum preservation of fresh produce, with much less condensation incidents likely to occur.
The invention has been described above with reference to a few embodiments. However, as is readily appreciated by a person skilled in the art, other embodiments than the ones disclosed above are equally possible within the scope of the invention, as defined by the appended claims.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2016/081692 | 12/19/2016 | WO | 00 |
