EP3450350A1 - Contenant de conditionnement et de cuisson ou de chauffage d'aliments dans un four à micro-ondes - Google Patents

Contenant de conditionnement et de cuisson ou de chauffage d'aliments dans un four à micro-ondes Download PDF

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Publication number
EP3450350A1
EP3450350A1 EP17189230.0A EP17189230A EP3450350A1 EP 3450350 A1 EP3450350 A1 EP 3450350A1 EP 17189230 A EP17189230 A EP 17189230A EP 3450350 A1 EP3450350 A1 EP 3450350A1
Authority
EP
European Patent Office
Prior art keywords
container
portions
pushed
foodstuffs
state
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.)
Withdrawn
Application number
EP17189230.0A
Other languages
German (de)
English (en)
Inventor
Julia Parlow
Ralf Winklmeier
Matthias Seidl
Zlatin Aleksiev
Miriam Kreuzer
David Messerer
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.)
Ostbayerische Technische Hochschule Regensburg (OTH Regensburg)
Original Assignee
Ostbayerische Technische Hochschule Regensburg (OTH Regensburg)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ostbayerische Technische Hochschule Regensburg (OTH Regensburg) filed Critical Ostbayerische Technische Hochschule Regensburg (OTH Regensburg)
Priority to EP17189230.0A priority Critical patent/EP3450350A1/fr
Publication of EP3450350A1 publication Critical patent/EP3450350A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package
    • B65D81/3446—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package specially adapted to be heated by microwaves
    • B65D81/3453—Rigid containers, e.g. trays, bottles, boxes, cups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D21/00—Nestable, stackable or joinable containers; Containers of variable capacity
    • B65D21/08—Containers of variable capacity
    • B65D21/086—Collapsible or telescopic containers

Definitions

  • the present invention is in the field of food packaging. More particularly, the present invention relates to a container for packaging foodstuffs and for cooking or warming up said foodstuffs in a microwave oven. The invention further relates to a method of packaging foodstuffs, in particular instant food, using such container.
  • microwave oven In a microwave oven, foodstuffs or liquids are heated by exciting rotations of water molecules contained therein by means of microwaves.
  • microwaves typically microwaves having a wavelength of about 12.2 cm are used, corresponding to an excitation frequency of 2.45 GHz.
  • a more sophisticated pressure and moisture release cooking container is described in US 7, 337, 916 B2 , comprising a tubular body having an open end and a cap for engaging the open end.
  • the cap comprises upper and lower ends which define an intermediate region therebetween.
  • the tubular body and the cap are at least partially sealed together by frictional forces resulting from the interference between opposing radially extending protrusions disposed on both, the tubular body and the cap. These frictional forces are opposed and eventually overcome by a steam pressure generated from within the container, whereby the cap is driven from a closed to a vented position.
  • This pressure and moisture release cooking container is comparatively complicated in structure, and therefore rather costly for disposable food packaging. Moreover, with the container of this prior art, it is difficult to assess the status of the cooking.
  • the cap since the cap only moves minimally between the closed and the vented position, it will generally be difficult to discern from outside the microwave oven whether the cap has already snapped open or not. Finally, once the cap snaps open, the pressure inside the container will decrease significantly as compared to just before the frictional forces of between opposing radial extending protrusions are overcome, such that the pressure-time curve exhibits a peak rather than a single plateau, which would be more favorable for gentle cooking.
  • US 2016/0137379 A1 discloses an expandable package in which dough can first be sold and in which dough can then also be proofed to the correct volume by consumers.
  • the package includes a first portion, a second portion and at least one indicator.
  • the first portion has a first closed end, at least one first side wall surrounding the first closed end, and a first open end opposite the first closed end.
  • the second portion has a second closed end, at least one second side wall surrounding said second closed end and a second open end opposite the second closed end.
  • the first portion and the second portion are movably connected at the respective open ends.
  • the at least one indicator is placed in communication with the package such that when the package is expanded to a desired inner volume, the indicator is activated.
  • the closed end of either portion may be opened when a desired inner volume of the dough is reached.
  • it may also be used for packaging and preparing popcorn, allowing for the popping of corn to a desired volume.
  • the problem underlying the invention is to provide a container for packaging foodstuffs and also cooking or warming up said foodstuffs, in particular instant food, which allows for a cost-efficient manufacture, good cooking behavior and at the same time gives the user visual feedback about the status of the cooking.
  • This problem is solved by a container according to claim 1.
  • a further aspect of the invention relates to a method of packing foodstuff using a container according to an embodiment of the invention, as set forth in claim 14. Preferable embodiments are defined in the dependent claims.
  • the container comprises a first container portion and a second container portion, each of said first and second container portions comprising a corresponding first or second end surface and a corresponding first or second wall part.
  • Said first and second wall parts comprise first and second engaging sections, respectively, wherein said first engaging section of the first wall part is configured to engage with said second engaging section of the second wall part in a close fit that
  • the container hence comprises first and second container portions that are slidably connected via their respective engaging portions providing a "close fit".
  • the "close fit” implies a certain degree of fluid tightness when the first and second engaging sections are engaged with each other in the pushed-together state, which is the state used for storage of the foodstuff in the container prior to its cooking, namely a degree of fluid tightness that prevents leakage of the foodstuff, or fluid portions thereof, under practical circumstances, such that no additional seal is needed.
  • the first and second container portions will start to move away from each other, thereby increasing the volume of the container. Any increase in volume in turn will lead to a drop of the vapor pressure inside the container, so it will take additional heating until the pressure overcoming the frictional force is regained. Accordingly, upon steam cooking, the first and second portions of the container move only gradually and slowly away from each other during the cooking, maintaining the pressure inside the container just at the level sufficient to overcome the frictional force.
  • the container according to the invention provides a number of advantages over the pressure and moisture release cooking container of the prior art cited above.
  • the container according to the invention is structurally more simple, and hence less costly to manufacture.
  • the container according to the invention allows not only for building up a desired pressure, but also for maintaining the desired pressure. While in the prior art described above, the pressure in the container first increases until the cap snaps open, and thereafter decreases again, in the container according to the invention the pressure is always balanced with the friction associated with the close fit between the first and second engaging sections. This is true not only for the phase during which the first and second container portions gradually move from the pushed-together state to the extended state, but in the extended state as well.
  • the exposure of the opening is likewise a gradual process, which, at a certain degree of opening, prevents a further increase of pressure, and hence a further moving of the first and second portions, but does not lead to any appreciable pressure drop once the maximum extension has been reached, provided that the heating power is maintained constant, as is the case in a microwave oven.
  • the relative motion of the first and second container portions stops automatically at a degree of exposure of the opening, where the loss of energy inside the container volume due to the escape of steam is in equilibrium with the supply of energy to the container volume by microwaves, which implies that the vapor pressure inside the container remains at least approximately constant.
  • this vapor pressure can be controlled by designing the frictional force or tightness of the fit between the first and second engaging sections.
  • the increase in volume upon moving from the pushed-together to the extended state is at least 10%, thereby defining a certain heating period and also giving a visual indication to the user about the state of cooking, as the user can e.g. see at a glance that the extended state has been reached. For some foods, this would indicate that the cooking is finished, for other foods, this could indicate that the desired vapor pressure has been achieved and that a final cooking period of a predetermined duration shall begin.
  • the volume of the container in the extended state exceeds the volume of the container in the pushed-together state by 15 to 45 %, preferably by 20 to 35%. All of these volume increases are sufficient to give a suitable visual indication to the user. Among these ranges, the suitable volume increases can be selected depending on the foodstuff to be packaged in the container, as the volume increase is related to the cooking time until the extended state is reached.
  • an outer surface of the first engaging section of the first container portion engages with an inner surface of the second engaging section of the second container portion.
  • the opening is preferably formed in the second engaging section of the second container portion. This means that in the pushed-together state, the opening provided in the second engaging section is separated from the foodstuff by the first engaging section, such that it will stay clean.
  • the wall part of the first container portion comprises
  • the outer surface of the proximal section of the first container portion is flush with the outer surface of the second engaging section, allowing for an easier handling and a better optical appearance.
  • one of or both of the end surfaces is/are flat.
  • a flat surface allows for placing the container thereon, facilitating storage, transportation and the cooking in the microwave oven. Note, however, that a flat surface is not mandatory, and that at least one of the end surfaces may be spherical or dome-shaped, in particular since the container will only need to have one end surface to stand on.
  • the end surface of the first container portion forms a base surface on which the container can stand in an upright position.
  • the container preferably further comprises a visual indication indicating the upright position to a user of the container.
  • the container has the shape of a cylinder having a circular, a square, a rectangular, a hexagonal or an octagonal cross-section.
  • the cylinder does not necessarily have to be a perpendicular cylinder, i.e. with the cylinder axis perpendicular to the end surfaces, however, in preferred embodiments, this is the case.
  • the container comprises a tape covering the opening, wherein said tape preferably also fixes the first and second container portions in the pushed-together state, said tape being releasable prior to cooking or heating the foodstuffs in the microwave oven.
  • the tape protects the opening from dust and dirt, but also prevents the first and second portions of the container from being separated.
  • the tape also indicates to the user that the package has not been opened yet. Upon preparing the foodstuff for cooking, the user may simply pull the tape off the package.
  • the first and second container portions are made from paper or cardboard, in particular from recycled paper or cardboard. This reduces the manufacturing costs of the container and is also environmentally friendly.
  • at least the portions of inner surface of the first and second container portions that are exposed to the foodstuffs when the container portions are in the pushed-together state are covered by a water and/or grease resistant coating or liner.
  • Water and grease resistant papers which can be recycled to 100% are known in the art and commercially available e. g. under the product name "Echo Natur" from SPO, Spezialpapierfabrik Oberschmitten.
  • At least portions of the outer surface of one or both of the first and second container portions are covered or treated such as to allow for printing thereon.
  • the outer surface may be covered by an additional paper layer of sufficient quality to print on.
  • a suitable sizing comprising a binder and filler particles, may be provided, which improves the printability of the outer surface.
  • a further aspect of the invention relates to a method of packaging foodstuffs, in particular instant food, using a container according to one of the embodiments recited above.
  • the method according to the invention comprises the following steps:
  • the method may further comprise a step of covering the opening with a tape, said tape also connecting the first and second container portions such as to fix them in the pushed-together state.
  • Fig. 1 is a front view of the container 10 in the pushed-together state
  • Fig. 2 is a side view of the container 10 in the pushed-together state
  • Fig. 3 is a front view of the container 10 in the extended state
  • Fig. 4 is a side view of the container 10 in the extended state
  • Fig. 5 is a top view of the container 10
  • figures 6 and 7 show sectional views, taken along the line A-A in Fig. 5 , in the pushed-together and extended states, respectively.
  • Figure 8 shows the layer structure of the container wall part.
  • Figures 9 and 10 show perspective views of the container 10 in the pushed-together and extended state, respectively.
  • FIG. 11 to 13 show three perspective views of the container 10 as shown in figures 8 and 9 , but with decoration of printing provided thereon, in a sequence of transitions from the pushed-together ( Fig. 11 ) to the extended state ( Fig. 13 ).
  • the container 10 comprises a first portion 12 comprising an end surface 14 and a wall part 16, which in the embodiment shown has a circular cylindrical shape and comprises a proximal section 18 and a distal section 20, the distal section 20 having a reduced outer diameter.
  • the distal section 20 forms a first engaging section.
  • the container 10 further comprises a second portion 22 comprising an end surface 24 and a wall part 26 which in its entirety forms a second engaging section.
  • a second engaging section 26 i.e. the second wall part
  • an opening 28 cf. figures 1, 3 , 6 and 7
  • the outer diameter of the second engaging section 26 corresponds to the outer diameter of the proximal section 18 of the first wall part 16, such that these outer surfaces are flush with each other when the container 10 is in the pushed-together state.
  • the first engaging section 20 is configured to engage with the second engaging section 26 in a closed fit.
  • the closed fit allows for a sliding movement of the first and second container portions 12, 22 relative to each other from a pushed-together state shown in Fig. 1 , 2 and 6 , in which the first and second container portions 12, 22 are closest together, to an extended state shown in Fig. 3 , 4 and 7 , in which the first and second container portions 12, 22 are moved away from each other, while still maintaining the engagement of their engaging sections 20, 26.
  • This sliding movement hence allows for adjusting the volume enclosed by said container 10 in what could be regarded as a "telescopic" manner.
  • the opening 28 provided in the second engaging section 26 is occluded by the first engaging section 20.
  • the opening 28 is exposed, such as to provide for a communication between the inner volume of the container 10 and the outer atmosphere.
  • the extended state is a state in which the opening 28 is fully exposed.
  • the "most extended state” would typically be a state in which the opening 28 is only partially exposed. Note further that the volume enclosed by the container 10 in the extended state exceeds the volume of the container 10 in the pushed-together state by approximately 25%.
  • Fig. 8 is an enlarged view of the encircled portion of Fig. 7 , showing the structure of the wall part 16.
  • the bulk of the wall part 16 is made from recycled cardboard 30.
  • a grease and water resistant coating 32 is provided on the inner surface of the wall part 16.
  • a thin paper layer 34 is provided, on which a decorative printing as shown in Fig. 11 to 13 is provided.
  • the printing as shown in Fig. 11 to 13 does not only have an aesthetic function, but also indicates the upright position of the container 10 as a whole, i.e. in the embodiment shown, with the first container portion 12 at the bottom and the second container portion 22 at the top.
  • the container 10 is intended for both, packaging foodstuffs as well as cooking or warming up said foodstuffs in a microwave oven.
  • the foodstuffs would be instant food, which only needs heating/cooking in a microwave oven, possibly after adding water and mixing by means of shaking the entire container 10.
  • the container 10 is hence prefilled with foodstuffs, and is sealed by means of a tape (not shown) connecting the first and second portions 12, 22 and also covering the opening 28 in the second engaging portion 26.
  • a tape (not shown) connecting the first and second portions 12, 22 and also covering the opening 28 in the second engaging portion 26.
  • the consumer peels of the tape (not shown) and places the container 10 including the foodstuff within a microwave oven. Depending on the foodstuff, the consumer may further add a prescribed amount of water and mix the foodstuff and the added water, by shaking the container 10 before placing it within the microwave oven.
  • the container is sized and dimensioned such that it can be held or grabbed with one hand, while simultaneously holding the first and second portions 12, 22 together, such as to avoid a separation of the first and second portions during shaking.
  • the water containing foodstuff After having been placed in the microwave oven, the water containing foodstuff is heated in the usual manner. Upon heating, water vapor (steam) is generated, and the vapor pressure steadily increases. In preferred embodiments, this steam is used for cooking the foodstuff in a gentle and tasteful way.
  • the vapor pressure inside the container 10 exceeds a frictional force generated by the tight fit between the first and second engaging sections 20, 26, the second portion 22 of the container will start moving upwards, thereby increasing the volume enclosed by said container 10. The increase in volume, in turn leads to a reduction in pressure, which has to be recovered by further heating.
  • the first portion will not rise abruptly, but gradually during the course of heating, while the vapor pressure is balanced with the frictional force determined by the tight fit between the first and second engaging sections 20, 26.
  • a desired vapor pressure upon cooking can likewise be predetermined.
  • the predetermined degree of friction is chosen such that a pressure difference between the inner volume of the container 10 and the outer atmosphere in the amount of between 0.2 and 2.5 bar (20 and 250 kPa), preferably between 0.5 and 1.0 bar (50 and 100 kPa) just allows for overcoming the frictional force.
  • different vapor pressures may be preferred, but in each case they can be predetermined by the "predetermined degree of friction" between the first and second engaging sections 20, 26.
  • the gradual separation of the first and second portions 12, 22 will automatically come to an end by the time a sufficiently large fraction of the opening 28 is exposed, such that the amount of steam escaping through the opening 28 is at equilibrium with the heat generated inside the volume of container 10.
  • this partial occlusion of the opening 28 is automatically adjusted such that the continuous heating will maintain the pressure just below the pressure needed to overcome the friction. That is to say, in the extended state shown in Fig. 13 , the vapor pressure is still maintained at, or only slightly below the desired vapor pressure.
  • the gradual extension of the container 10 is an indication of the cooking state that can be perceived by visual inspection by the consumer easily.
  • the container 10 could for example be used together with instructions to the consumer to stop the heating by the time a certain degree of separation is reached, that could for example be marked on the outer surface of the first engaging section 20.
  • the consumer can be instructed to turn off the microwave oven once it is perceived that the process of gradual separation has come to an end (i.e. the container 10 has reached the maximally extended state).
  • the consumer may be instructed to wait until the extended state is reached, and to then wait for another predetermined period of time (or reset the timer of the microwave for this predetermined time).
  • the clearly visible separation of the first and second container portions 12, 22 gives visual feedback to the consumer about the cooking state, that greatly improves the usefulness of the container according to the present invention.
  • the container 10 as shown in one of Fig. 1 to 13 may be used in a method of packaging foodstuffs, in particular instant food.
  • Such method comprises the steps of: filling the foodstuffs into one of the first and second container portions 12, 22, bringing said one of the first and second container portions (12, 22) into engagement with the other of the first and second container portions 12, 22, and pushing the first and second container portions 12, 22 together into said pushed-together state.
  • the method further comprises a step of covering said opening 28 with a tape (not shown), thereby also connecting the first and second container portions 12, 22 such as to fix them in the pushed-together state, for transportation and storage.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Food Science & Technology (AREA)
  • Package Specialized In Special Use (AREA)
EP17189230.0A 2017-09-04 2017-09-04 Contenant de conditionnement et de cuisson ou de chauffage d'aliments dans un four à micro-ondes Withdrawn EP3450350A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP17189230.0A EP3450350A1 (fr) 2017-09-04 2017-09-04 Contenant de conditionnement et de cuisson ou de chauffage d'aliments dans un four à micro-ondes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17189230.0A EP3450350A1 (fr) 2017-09-04 2017-09-04 Contenant de conditionnement et de cuisson ou de chauffage d'aliments dans un four à micro-ondes

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EP3450350A1 true EP3450350A1 (fr) 2019-03-06

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EP17189230.0A Withdrawn EP3450350A1 (fr) 2017-09-04 2017-09-04 Contenant de conditionnement et de cuisson ou de chauffage d'aliments dans un four à micro-ondes

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112591313A (zh) * 2020-12-14 2021-04-02 郑绍芳 一种用于方便速食食品的冲泡器具

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7337916B2 (en) * 2003-12-29 2008-03-04 Sonoco Development, Inc. Pressure/moisture release cooking container
WO2011060410A2 (fr) * 2009-11-16 2011-05-19 Graphic Packaging International, Inc. Plateau aéré triangulaire
US20120061386A1 (en) * 2010-09-15 2012-03-15 Steven Parsons Food tray
US20160137379A1 (en) 2010-02-12 2016-05-19 Martin Lapham Packages for and methods of packaging food products

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7337916B2 (en) * 2003-12-29 2008-03-04 Sonoco Development, Inc. Pressure/moisture release cooking container
WO2011060410A2 (fr) * 2009-11-16 2011-05-19 Graphic Packaging International, Inc. Plateau aéré triangulaire
US20160137379A1 (en) 2010-02-12 2016-05-19 Martin Lapham Packages for and methods of packaging food products
US20120061386A1 (en) * 2010-09-15 2012-03-15 Steven Parsons Food tray

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112591313A (zh) * 2020-12-14 2021-04-02 郑绍芳 一种用于方便速食食品的冲泡器具

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