WO1992005090A1 - Emballage sensible a la chaleur produite par exposition aux micro-ondes - Google Patents

Emballage sensible a la chaleur produite par exposition aux micro-ondes Download PDF

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Publication number
WO1992005090A1
WO1992005090A1 PCT/GB1991/001611 GB9101611W WO9205090A1 WO 1992005090 A1 WO1992005090 A1 WO 1992005090A1 GB 9101611 W GB9101611 W GB 9101611W WO 9205090 A1 WO9205090 A1 WO 9205090A1
Authority
WO
WIPO (PCT)
Prior art keywords
container
heat
container according
food
lid
Prior art date
Application number
PCT/GB1991/001611
Other languages
English (en)
Inventor
David Livesley
Original Assignee
Cambridge Consultants Limited
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
Priority claimed from GB909020605A external-priority patent/GB9020605D0/en
Application filed by Cambridge Consultants Limited filed Critical Cambridge Consultants Limited
Publication of WO1992005090A1 publication Critical patent/WO1992005090A1/fr

Links

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
    • B65D2581/00—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
    • B65D2581/34—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
    • B65D2581/3437—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 specially adapted to be heated by microwaves
    • B65D2581/3439—Means for affecting the heating or cooking properties
    • B65D2581/3444—Packages having devices which convert microwave energy into movement
    • 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
    • B65D2581/00—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
    • B65D2581/34—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
    • B65D2581/3437—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 specially adapted to be heated by microwaves
    • B65D2581/3471—Microwave reactive substances present in the packaging material
    • B65D2581/3472—Aluminium or compounds thereof
    • 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
    • B65D2581/00—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
    • B65D2581/34—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
    • B65D2581/3437—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 specially adapted to be heated by microwaves
    • B65D2581/3486—Dielectric characteristics of microwave reactive packaging
    • B65D2581/3494—Microwave susceptor

Definitions

  • the present invention relates to food packaging, in particular for food that is to be heated in a microwave oven.
  • the present invention provides an assembly comprising a container and (optionally non-integral with or otherwise separate therefrom) a heat-recoverable article that can be dimensionally-recovered at a desired temperature (and preferably after the container has been closed, to the environment or otherwise) to cause an externally-visible change in the container and optionally to allow the container if closed to be opened.
  • Reference to the recovery allowing the container to be opened excludes merely a situation where recovery of a dimensionally-recoverable article causes an environmental seal to be made, as is the case with conventional heat-shrink tubing or sleeves for sealing cable splices etc, see for example GB 1155470.
  • the recovery opens the container or has substantially no effect on the sealing provided by the container.
  • the container is of particular use for foodstuffs, by which term we include food, drink and medicines etc.
  • the container need not be closed to the environment, although we prefer that it is. It can then constitute the outer packaging for storage and sale, thus saving on further materials. It may, however, merely comprise some means of mechanically retaining the foodstuff, or of supporting it. In this latter case "opening" of the container is to be construed as merely allowing removal of the foodstuff .
  • the container will comprise a box, of square or rectangular or other shape in plan view, with a lid.
  • the lid may be substantially rigid and attached to the rim of a base or other part at one edge by a hinge line about which it can pivot.
  • the remaining edge(s) of the lid may be temporarily attached to the base by some means such as a hot-melt adhesive of low softening point.
  • the lid may cover the whole of a food receiving space defined by a base of the box and may be opened or closed a whole by being caused to pivot about the hinge line on heat-induced contraction of the dimensionally-recoverable material.
  • the base may be formed with a multiplicity of individual food receiving spaces separated by internal partitions, as where different foods are to be kept separate during cooking or to be cooked under different conditions, e.g with and without exposure to air.
  • the heat receiving means may be arranged to open part of each space, or only some of the spaces.
  • the lid may be of flexible material such that the container can be opened by convolution or other conformational change of the lid.
  • the visible change is a change in the container and (in general) not (solely) that of a heat-recoverable article separate from the container.
  • a separate article may dimensionally recover and cause a visible change to the container, such as opening of its lid; or a part of the container, such as the lid, may itself recover for example by convoluting and opening the container.
  • the change in the container may be a conformational change, such as a lid becoming convoluted (which term includes for example coiling-up and becoming corrugated), and also changes in arrangements of parts that in themselves do not change shape, such as a substantially rigid lid pivoting open.
  • a conformational change such as a lid becoming convoluted (which term includes for example coiling-up and becoming corrugated), and also changes in arrangements of parts that in themselves do not change shape, such as a substantially rigid lid pivoting open.
  • a dimensionally-recoverable article is an article that undergoes a significant dimensional change when subjected to some treatment, such as heating.
  • Such articles may be produced by heating an article, deforming it while hot, and cooling it whilst deformed. It then retains its deformed shape until heated again, when it returns to its original shape.
  • the article may have been cross-linked at some stage, generally before the initial deformation.
  • the deformation may occur simultaneously with formation of the article, or an article may be made from deformed material, in which case the article on heating will adopt a new shape.
  • the deformation may be by stretching, in which case the article will be heat-shrinkable.
  • the articles are commonly made from compound based on semi-crystalline polymers such as polyethylene.
  • Heat-shrinkable articles are well known in other arts, such as environmental sealing of cables, and no more need be said about the general principles of heat-shrink technology.
  • the heat-recoverable article is in sheet form and is substantially uniaxially shrinkable in the plane of the sheet. When heated they can shrink in a linear dimension ratio of 2:1 to 3:1 or less usually in a ratio of up to 10:1.
  • Such a sheet of heat-shrinkable material may extend across a hinge line of the container and be fixed to surfaces of the container, such as a top of a lid and a side panel of a base, joined by the hinge line.
  • the hinge line may comprise a mechanical hinge with pivot pin etc, but we prefer that it comprise a fold or other live hinge, optionally with a line of weakness produced for example by a so-called kiss-cut or by a pre-creased hinge. This ensures that the hinging occurs at a precise location.
  • the heat-shrinkable sheet preferably is substantially unidirectionally shrinkable, the shrinkage direction being substantially perpendicular to the hinge line. Lack of shrinkage parallel to the hinge line will in general avoid undesirable distortion of the container. Tension in the heat-shrinkable sheet that occurs above the shrink temperature as the sheet attempts to shrink, will cause the lid to pivot about the hinge line and, provided that the heat shrinkable sheet is applied to the outer face of the hinge, therefore to open.
  • the base and lid may each be rounded or bevelled, or may have a recess between them.
  • a portion of the heat shrinkable sheet can lie oblique to the surfaces of the lid and base to which it is attached. In some circumstances this might enhance opening of the lid by ensuring that tension in the shrinkable sheet was not solely parallel to the surfaces of the lid and base.
  • the recoverable article may be bonded, welded or otherwise fixed to the container.
  • suitable adhesives include curable adhesives, or latex-based adhesives such as that known by the Trade Mark, Copydex.
  • Hot-melt adhesives are not at present preferred due to the heating required for installation. They may, however, be used if they have a softening point greater than the recovery temperature and if the recoverable article is held-out during bonding or if application time is sufficiently short.
  • a recoverable article causes one surface of the container to move relative to another such as opening of the container if closed.
  • resilient means may be provided for opening the container, which resilient means is activated by recovery of the recoverable article.
  • Such resilient means may comprise some spring separate from the container proper, or it may comprise resilience of the walls of the container.
  • the container may have some form of latch or other snap-shut closure, which on release allows the lid to spring open. Recovery of the recoverable article may force the latch open.
  • the recoverable article could comprise an elongate member such as a rod that expands in diameter (optionally with longitudinal shrinkage) on heating. Such a rod may be positioned between the lid and the base and therefore force them apart, overcoming the latch, when the desired temperature is reached. Additionally or alternatively, recovery of the recoverable article may overcome some sealing means such as an adhesive or sealant.
  • the adhesive may comprise a hot-melt adhesive that softens, preferably at or below the recovery temperature.
  • recovery of the recoverable article may cause concealment (either totally or partially) or exposure of a surface of the container.
  • the effect of this may be to change a message on a visible surface of the container.
  • a message such as "Ready” or "Eat Now” may initially be obscured from view, for example by an opaque covering that is removed e.g by sliding on recovery of the recoverable article.
  • an initial message may read "Not
  • any of various mechanisms may be provided by means of which recovery occurs at the correct moment. In general it is desirable that recovery occur after a time that reflects a certain temperature and time of heating of the foodstuff within the container.
  • the recoverable article be heated by heat from the foodstuff which reaches the recoverable article by thermal conduction through a wall or walls of the container, and more preferably substantially solely by that means.
  • the recoverable article is preferably substantially unresponsive to microwaves (at least to those of the wavelength and intensity of a domestic microwave oven, generally about 2450 MHz and 400-700 watts), or is shielded from them.
  • the recovery temperature may be chosen to be equal to or greater than or less than the desired final temperature of the foodstuff, and the thermal path chosen to achieve a suitable thermal gradient. In this way recovery can be made to occur at just that moment when the foodstuff has been at its desired temperature for the desired length of time. It will be seen that this relationship between time of recovery and correct heating time will be substantially independent of initial temperature, microwave power and number of containers in the oven. That may not be true for very short heating times and very high thermal gradients, but in practice we have found satisfactory results .
  • the recovery temperature and thermal path can be easily determined empirically for various different foodstuffs.
  • Recovery of shape of the shape recoverable article may be accelerated or retarded by suitable means.
  • suitable means there may be provided an insulating layer or layers between the recoverable article and the container.
  • an extra layer of the container e.g an extra cardboard layer could be incorporated, or an additional layer of a polymer as such or in an expanded state could be incorporated.
  • the rate of conduction from the foodstuff to the recoverable article may be increased by provision of a thermal conductor on or within the container adjacent to the recoverable article, for example, by fabricating a container at least in part of conductive material or by employing a conductive or heat generating member within it.
  • a heat generating member that absorbs microwaves and in thermal contact with the heat recoverable article via an intervening way of the container.
  • Such thermal contact may be additional to or instead of a thermal connection between the foodstuff and the recoverable article.
  • assessment of degree of heating of the foodstuff is more indirect when using this further member, greater flexibility in design is possible.
  • the further member may comprise a sheet attached to an inside of a lid or base face-to-face with an external recoverable article.
  • the response of the further member to microwaves, its heat capacity and its conductivity can be varied at will.
  • Figure 1A shows a container in a nearly closed state and Figure IB shows it in an open state;
  • Figures 2A is a cross-section through a lid and a base of another container, and Figure 2B is a diagramatic side view of the container in its open state;
  • Figures 3A and 3B show a design where a lid becomes convoluted when the container is heated.
  • Figures 4A and 4B show a design where a surface becomes exposed or concealed by relative sliding movement.
  • Figure 1A shows a container 1 in the form of a paperboard box comprising a base 2 having a bottom panel and upstanding wall panels defining a food receiving space and a and a lid 3 which is complementary to and fits over the base 2 to cover the food receiving space.
  • the base 2 and the lid 3 may be formed integrally from e.g a single piece of paperboard about 100-500 micrometres thick as is well known in the box- or carton-making art, and its base dimension may be about 10cm x 15 or 20cm as is typical for a single portion food container.
  • a heat-shrinkable sheet 4 of typical thickness 100-400 micrometres is fixed by adhesions to surfaces of the base 2 and lid 3, across a hinge line 5 at which the lid 3 hinges towards or away from the base 2.
  • the hinge line 5 arises at an intermediate position, in this instance at approximately mid-height of the back or hinge containing wall of the box.
  • Other edges 6 of the base and lid may be temporarily sealed together so that the container is closed to the environment.
  • the contents of the container can remain sterile.
  • heat in the interior space of the container will be conducted through the material of the container to the sheet 4 which will shrink causing the lid to open. This will indicate to the cook that sufficient heating has occurred.
  • the sheet 4 or other recoverable article can be provided during manufacture of the container, during packaging of the foodstuff, or just prior to heating.
  • the sheet 4 may be applied in such a way that in the early stages of shrinkage an adhesive attaching it to the base 2 and lid 3 is in sheer. Later, when the lid is for example wide open the angle between the relevant surfaces of base and lid may be such that the adhesive is in peel. In this way, the shrinkage can exert an opening force initially, but adhesive failure will later occur to prevent excessive opening which might cause the container to take up too much room in the oven. It might, however, be preferable if the sheet does not fall free since that may allow the lid to fall closed. In a preferred embodiment therefore the sheet remains bonded at its opposing edges, but between those edges it is or becomes free to separate from lid and base. In this way thermal contact to the container is lost over a large part of the sheet and shrinkage stops (see Figure IB). In any case it will be appreciated that a visual change such as lid opening is unlikely to go unnoticed, and is preferable to a mere colour change.
  • the container comprise cardboard (though it could also be of moulded plastics), and the shrinkable sheet comprise polyethylene.
  • the materials have no smell and do not taint the foodstuff.
  • the sequence of events that occurs on heating will generally be as follows: foodstuff, container or other conductive member absorbs microwaves and gets hot, adhesive joining edges 6 fails by melting or reduction in tack etc, shrinkable sheet 4 receives heat by conduction and begins to shrink, after a time lapse the lid 3 opens perhaps as far as vertically, a bond holding the shrinkable sheet to base and/or (preferably or) lid fails by peel or otherwise, foodstuff is ready to be eaten or drunk.
  • the heat activation temperature of the sheet 4 may be 80-175°C and the adhesive joining edges 6 may be a hot melt adhesive that softens or becomes molten more than 10°C and typically about 20°C below the activation temperature of the sheet 4. Even after it has melted, the adhesive at edges 6 will tend to maintain the container closed until the force developed by sheet 4 has become sufficient to overcome the resistance of the adhesive and pull the edges apart.
  • various aspects of the design can determine when shrinkage starts and any time lapse before a chosen visible change has occurred.
  • the following may be considered: for the container, its thickness, response to microwaves, its heat capacity, any coating, its colour, and its design; for the recoverable article, its shrinkage temperature and force and recovery ratio, its response to microwaves and its heat capacity, its colour, its surface chemistry which will affect adhesion etc and the thermal route between it and the foodstuff or other absorber of microwaves; for any such other absorber, its response to microwaves, its area and overlap with the recoverable article, and its surface characteristics.
  • Figure 2A is a cross-section through a hinge-containing edge of a top edge hinged box of paperboard or other suitable material having a base 2 and lid 3 which meet at a hinge line 5.
  • the lid when closed as shown, is substantially perpendicular to the base.
  • An adhesive 7 which does not melt under the expected service conditions of the box (or which melts or softens relatively slowly at the temperature reached by the box when the food is ready to eat) can be seen holding a heat-shrinkable sheet 4 to the base and to the lid.
  • Various adhesives that cure other than by the action of heat are preferred for the adhesive 7.
  • Adhesive 8 may comprise an adhesive of low melting point typically about 40-80°C.
  • a paraffin wax or a hot melt adhesive such as a butadiene rubber that melts or softens at the appropriate temperature and does not interfere with the action of the sheet 4.
  • Double-sided adhesive tapes (preferably using pressure-sensitive or contact adhesives) may also be used, especially for the adhesive
  • a further member 9 that has the function of absorbing microwaves, becoming hot, and transmitting heat by conduction to the sheet 4.
  • It may be a sheet of metallised heat resistant material e.g aluminsed mica or heat resistant plastics the metallisation being very thin as in a vacuum deposited coating so that excessive heat is not absorbed and the oven is not damaged. It can be seen to be positioned face-to-face with at least part of the sheet 4.
  • Such a member can be used to bring forward the moment when the lid opens. This is simply because heat does not have to pass the air gap within the container that has to be passed by heat from the foodstuff. Adjustment the other way, i.e. delaying lid opening, can be achieved for example by provision of an insulating layer e.g an additional paperboard sheet or a plastics sheet between sheet 4 and the base and lid of the container.
  • Figure 2B shows the container with the lid open.
  • the sheet 4 can be seen to have separated from lid and base, breaking thermal contact, and preventing further shrinkage.
  • FIGs 3A and 3B may be preferred for shallower or wider containers, such as trays .
  • the lid 3 which in general will be highly flexible and thin, convolutes, especially by coiling.
  • the lid may be a laminate of layers of different shrinkage, for example a lower layer (as drawn) that is not shrinkable and an upper layer that is highly shrinkable. The differential shrinkage will result in some coiling.
  • film 4 is bonded to a surface 11 of a container by an anchoring adhesive 12. Before heating a first message 13 (if any) is in view.
  • the film 4 After heating as shown in Figure 4B the film 4 has shrunk to move message 13 and/or to expose a new message 14.
  • the same kind of translational movement of a movable panel across a fixed lid of the container may be used to expose e.g one but not both compartments of a two compartment container in which the compartments are in adjacent relationship along a base of the container and are separated by an internal wall.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Food Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Package Specialized In Special Use (AREA)
  • Packages (AREA)

Abstract

Emballage destiné à un produit alimentaire à cuire par micro-ondes et pourvu de moyens sensibles à la chaleur produite lors de l'exposition de l'emballage aux micro-ondes, pour provoquer l'ouverture dudit emballage quand le produit alimentaire qu'il contient a été réchauffé à la température idéale en vue de sa consommation.
PCT/GB1991/001611 1990-09-21 1991-09-20 Emballage sensible a la chaleur produite par exposition aux micro-ondes WO1992005090A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB909020605A GB9020605D0 (en) 1990-09-21 1990-09-21 Food packaging
GB9020605.3 1990-09-21
GB9103008A GB2248159A (en) 1990-09-21 1991-02-13 Food packaging
GB9103008.0 1991-02-13

Publications (1)

Publication Number Publication Date
WO1992005090A1 true WO1992005090A1 (fr) 1992-04-02

Family

ID=26297684

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1991/001611 WO1992005090A1 (fr) 1990-09-21 1991-09-20 Emballage sensible a la chaleur produite par exposition aux micro-ondes

Country Status (2)

Country Link
EP (1) EP0548218A1 (fr)
WO (1) WO1992005090A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001030657A2 (fr) * 1999-10-27 2001-05-03 M.S.O. Limited Emballages de cuisson pour micro-ondes
GB2369341A (en) * 2000-11-22 2002-05-29 Mccain Foods A heat responsive food product container
CN102152904A (zh) * 2011-01-31 2011-08-17 上海大塚食品有限公司 一种方便食品的盒装结构
US8409645B2 (en) 2008-11-18 2013-04-02 Kraft Foods Group Brands Llc Food package for segregating ingredients of a multi-component food product
US8541038B2 (en) 2008-11-18 2013-09-24 Kraft Foods Group Brands Llc Food package for segregating ingredients of a multi-component food product
US8551545B2 (en) 2008-11-18 2013-10-08 Kraft Foods Group Brands Llc Food package for segregating ingredients of a multi-component food product
WO2014058437A1 (fr) * 2012-10-12 2014-04-17 Empire Technology Development Llc Récipients présentant des matériaux à changement de forme

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3507668A (en) * 1969-02-28 1970-04-21 Hugh H Bridgford Combination automatically opening frozen dough receptacle and baking pan
US4497431A (en) * 1982-01-04 1985-02-05 James River--Norwalk, Inc. Container structure
WO1989002715A1 (fr) * 1987-10-05 1989-04-06 Toyo Seikan Kaisha, Ltd. Recipient hermetique destine a la cuisson dans un four a micro-ondes
EP0356169A2 (fr) * 1988-08-19 1990-02-28 Campbell Soup Company Emballage pour aliments avec une fermeture se libérant sous l'effet des micro-ondes
WO1990007853A1 (fr) * 1988-12-28 1990-07-12 E.I. Du Pont De Nemours And Company Emballage modelable et retrecissable pour appareils a micro-ondes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3507668A (en) * 1969-02-28 1970-04-21 Hugh H Bridgford Combination automatically opening frozen dough receptacle and baking pan
US4497431A (en) * 1982-01-04 1985-02-05 James River--Norwalk, Inc. Container structure
WO1989002715A1 (fr) * 1987-10-05 1989-04-06 Toyo Seikan Kaisha, Ltd. Recipient hermetique destine a la cuisson dans un four a micro-ondes
EP0356169A2 (fr) * 1988-08-19 1990-02-28 Campbell Soup Company Emballage pour aliments avec une fermeture se libérant sous l'effet des micro-ondes
WO1990007853A1 (fr) * 1988-12-28 1990-07-12 E.I. Du Pont De Nemours And Company Emballage modelable et retrecissable pour appareils a micro-ondes

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001030657A2 (fr) * 1999-10-27 2001-05-03 M.S.O. Limited Emballages de cuisson pour micro-ondes
WO2001030657A3 (fr) * 1999-10-27 2001-12-13 M S O Ltd Emballages de cuisson pour micro-ondes
GB2369341A (en) * 2000-11-22 2002-05-29 Mccain Foods A heat responsive food product container
US8409645B2 (en) 2008-11-18 2013-04-02 Kraft Foods Group Brands Llc Food package for segregating ingredients of a multi-component food product
US8541038B2 (en) 2008-11-18 2013-09-24 Kraft Foods Group Brands Llc Food package for segregating ingredients of a multi-component food product
US8551545B2 (en) 2008-11-18 2013-10-08 Kraft Foods Group Brands Llc Food package for segregating ingredients of a multi-component food product
CN102152904A (zh) * 2011-01-31 2011-08-17 上海大塚食品有限公司 一种方便食品的盒装结构
WO2014058437A1 (fr) * 2012-10-12 2014-04-17 Empire Technology Development Llc Récipients présentant des matériaux à changement de forme

Also Published As

Publication number Publication date
EP0548218A1 (fr) 1993-06-30

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