EP1159856B1 - Heating a product intended for consumption in a microwave apparatus - Google Patents
Heating a product intended for consumption in a microwave apparatus Download PDFInfo
- Publication number
- EP1159856B1 EP1159856B1 EP00909792A EP00909792A EP1159856B1 EP 1159856 B1 EP1159856 B1 EP 1159856B1 EP 00909792 A EP00909792 A EP 00909792A EP 00909792 A EP00909792 A EP 00909792A EP 1159856 B1 EP1159856 B1 EP 1159856B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- water
- container
- product
- shield
- heating
- 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.)
- Expired - Lifetime
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/647—Aspects related to microwave heating combined with other heating techniques
- H05B6/6491—Aspects related to microwave heating combined with other heating techniques combined with the use of susceptors
- H05B6/6494—Aspects related to microwave heating combined with other heating techniques combined with the use of susceptors for cooking
Definitions
- the invention is partly based upon the insight that also in respect of, inter alia, the organoleptic properties of many kinds of products intended for consumption other than eggs, it is advantageous to expose them to the microwave field only to a slight extent, if at all, during heating and not to have them contact water for a long time.
- the apparatus according to the example shown in Figs. 1-3 has a container 1 from more or less form-retaining material having cavities 4, 5, 6 and 7, each for receiving a product intended for consumption in the form of an egg.
- the cavities 4, 5, 6 and 7 are recessed partly in an upper part 2 and partly in a lower part 3 of the container 1.
- the energy conversion medium in which the conversion of microwaves into heat takes place, is present in an energy conversion unit in which the energy conversion medium is kept separate from the product, the laborious process of filling the container with an energy conversion medium is not necessary. Further, shortening of the storage life of the egg through contact with a liquid energy conversion medium is prevented, so that it is possible without any problem to place the eggs in the container already a long time before their preparation. Hence, the container can also be used for storing the eggs.
- the material in which the energy conversion takes place is material of the container 1
- the advantage achieved is that the same material is used for keeping the egg to be heated in position and for converting microwave energy, which enables an efficient construction.
- the material of the container 1 is located close to the egg 19 to be heated, which promotes an intensive energy transfer from the heated material to the egg 19.
- Water included in the form retaining material also, or optionally exclusively, serves to convert microwave energy into heat.
- a material or component having hygroscopic properties such as gypsum, sugar, kitchen salt, or special salts may be applied, so that the material in cool condition absorbs moisture from the air, which subsequently serves as energy conversion medium.
- the more or less form-retaining material may have pores for absorbing water or another microwave-absorbing medium.
- the microwave energy-converting medium is driven from the material of the container 1 under the influence of a microwave field, the energy-absorbing capacity of the container 1 automatically decreases as it is exposed to the microwave field.
- the danger of overheating in the case of a long exposure to a microwave field - for instance because the user forgets that eggs are being boiled in the microwave apparatus - is limited.
- the microwave shields 8-11 are likewise divided into parts included in the upper part 2 and the lower part 3 of the container 1.
- the parts of the microwave shield are provided with flanged edges 16, 17 which are in flat abutment when the upper part 2 of the container 1 is positioned on the lower part 3 of the container 1.
- the edges are directed inwards or outwards and interconnect properly to prevent sparking in the area of the connection between the parts 2 and 3 of the container 1.
- the shields 8-11 each function as one whole.
- raw eggs 19 are positioned in the portions of the recesses 4-7 in the lower part 3 of the container 1.
- the upper part 2 of the container 1 is placed onto the lower part 3 of the container 1.
- the egg is confined in material for converting microwave energy and at the same time, the provision of the shield of the egg against microwaves has been completed.
- the container 1 is placed in a microwave apparatus. As a matter of fact, these operations can in principle be performed in any desired order.
- a field of microwaves is generated in the area of the egg, microwave energy in the area of the egg being converted into heat, which heat is transferred to the egg.
- the apparatus Since the conversion of microwaves into heat, at least for some time after the start of the generation of the field of microwaves in the area of the egg, takes place in the more or less form-retaining material, it is not necessary to fill a container with water or other loose materials to obtain the desired microwave-absorbing properties. Hence, the apparatus is always immediately ready for use and can always be stored immediately after use. The release of water is at least substantially limited, thus preventing the corrosion-promoting precipitation of moisture in the microwave apparatus.
- the handgrip 12 is manufactured from a material which absorbs microwaves very little, if at all, and which forms a poor thermal conductor. For this, for instance, various types of glass and plastic can be used, for instance known for application in tableware intended for use in a microwave oven (other than for forming a crust). Hence, the handgrip 12 is hardly heated, if at all, despite the high temperature of the upper and lower parts 2 and 3 of the container 1 during use.
- the container 1 For determining what temperature has been reached, the container 1 comprises temperature indicators 14 and 15. These temperature indicators 14 and 15 enable accurate control of the degree of cooking of the eggs, such as hard-boiled or soft-boiled, also during cooking of the eggs in different types of microwave ovens.
- the container 51 is manufactured from fibrous material and a substantially form-retaining material in the form of molded composite material from wood fibers and cement.
- a substantially form-retaining material in the form of molded composite material from wood fibers and cement.
- Such material is easy to mold into a shape, heats strongly in a microwave field and has a high flash point.
- other materials such as cardboard, preferably having hygroscopic and flash point-reducing components.
- eggs 69 Located in the container 51 are eggs 69, each having an egg shell 70, egg-white 71 and a yolk 72.
- the container 51 forms part of a package in which the eggs 69 are packaged.
- the eggs 69 are each provided with a shield 58 for shielding the egg 69 from microwaves, which shield 58 fits tightly around the shell 70.
- the tight fit of the shield 58 around the shell 70 is advantageous for promoting the heat transfer to the egg 69. Due to its hygroscopic properties, the material of the container 51 contains, at least in operative condition, water that has remained behind since the manufacture and/or that has been absorbed from the surroundings.
- the eggs 69 each carry the shields 58 against microwave radiation themselves, so that those shields can be realized with a very slight input of material.
- the shields 58 are designed as electrically conductive sheet provided around the eggs 69.
- the shields 58 against microwave radiation are further provided with passages 74, some of which are shown schematically. These passages 74 are so small that no or hardly any microwave energy penetrates therethrough into the eggs 69, but water vapor can actually penetrate therethrough to reach the shells 70 of the eggs 69. This further promotes the heat transfer. Moreover, upon longer heating of the material around the egg 69, water condensed against the shells of the eggs prevents overheating of the egg 69. Thus, the passages or perforations 74 on the one hand contribute to the shortening of the time required for giving an egg the desired degree of cooking, and on the other prevent overheating of the egg.
- the shield 108 is designed as a nonperforated aluminum dish. Outside the shield 108, there is located in the container 101 water 125 for converting microwaves into heat. The water 125 is present in an energy conversion unit 126, so that the water 125, at least before the start of the generation of the microwave field, is kept separate from the product 119-121.
- the water container 127 is designed in the form of a bag, such as a sachet, it can readily be prefabricated and added during the packaging of the food 119-121.
- the container 101 enveloping the food 119-121 forms a substantially hermetically sealed covering of the food 119-121, so that moisture is prevented from escaping to the interior of the microwave oven.
- this container is provided with a blow-off opening 131 closed off by a lip 132 for releasing the opening 131 in reaction to the exceeding of a given excess pressure within the container 101 relative to the surroundings.
- the lid may be provided with a relatively thick layer of electrically conductive material or, for instance, be formed from thin-walled aluminum to form an effective shield.
- the sheet 235 is provided with anticondensing material, so that the food 219 is also properly visible when presented in a refrigerated display.
- a medicine 292 Located in the lowermost portion 253 is a medicine 292.
- a sachet 277 containing bacteria-free water 275.
- the container 251 with said content is placed in a microwave oven. Through action of the microwaves, the water 275 in the sachet 277 is heated.
- the lower portion 253 is manufactured from a material such that under the influence of the microwave field, it is likewise heated, in the prescribed time, to about 100°C. According to this example, the lower portion 253 and the lid 252 are manufactured from glass.
- the upper portion 302 there is a space for placing a sachet 327 with liquid 325, which opens under the influence of the microwaves and then heats the contents of the bag 308. It is possible to have the material from which the container 301 is made participate in the heating up of the contents of the bag 308 by selecting the appropriate material for the container 301.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Cookers (AREA)
- Constitution Of High-Frequency Heating (AREA)
- Meat, Egg Or Seafood Products (AREA)
Abstract
Description
Claims (24)
- A method for heating a product intended for consumption, comprising the steps of: placing the product (19; 69; 119-121;169; 219; 292) in a container (1; 51; 101; 151:201; 251; 301), fitting a shield (8-11; 58; 108; 158; 208; 258; 308) against microwaves around the product, providing water (51; 125; 175; 225; 275; 325) in an area near or around the product (19; 69; 119-121;169; 219; 292), outside the shield (8-11; 58; 108; 158; 208; 258; 308) and in the container (1; 51; 101; 151;201; 251; 301), and subsequently generating a field of microwaves in said area, microwave energy being converted in the water (51; 125; 175; 225; 275; 325) into heat, said heat being at least partially transferred to the product (19; 69; 119-121;169; 219; 292), characterized in that, at least before the start of the generation of said field of microwaves in said area, the water (51; 125; 175; 225; 275; 325) is located outside the shield (8-11; 58; 108; 158; 208; 258; 308) and in the container (1; 51; 101; 151:201; 251; 301) in an energy conversion unit (1; 51; 126; 175, 177, 184; 225,227; 275, 277; 325, 327) in which the water (51; -125; 175; 225; 275; 325) is kept separate from the product (19; 69; 119-121;169; 219; 292) in a water container (1; 51; 127; 177, 184; 227; 277; 327), said water container at least initially keeping the water separate from the product and releasing the water in reaction to the heating of the water by said microwave field.
- A method according to claim 1, wherein the water container is a bag (127; 227; 277; 327) which opens in reaction to heating of the water.
- A method according to claim 1 or 2, wherein, at least up to some time after the start of the generation of said field of microwaves in said area, the water (125, 175, 225, 275, 325) evaporates from a first area and condenses in a second area which, at least on average, is located closer to the product (19; 69; 119-121; 169; 219; 292) than said first area.
- A method according to claim 3 wherein the water (125; 175; 225; 275; 325) is obstructed from moving away from the product (19; 69; 119-121; 169; 219; 292) beyond a specific barrier (73; 101; 151; 201; 251; 301).
- A method according to any one of the preceding claims, wherein the product is an egg (19; 69) which, starting from a raw condition, is heated in its shell (70) to become a boiled egg.
- An apparatus for heating a product (19; 69; 119-121; 169; 219; 292) intended for consumption by means of a microwave field, comprising: a container (1; 51; 101; 151; 201; 251; 301) for enveloping the product (19; 69; 119-121; 169; 219; 292), a shield (8-11; 58; 108; 158; 208; 258; 308) for shielding the product (19; 69;119-121; 169; 219; 292) from microwaves, and water (51; 125; 175; 225; 275; 325) located outside said shield (8-11; 58; 108; 158; 208; 258; 308) and in said container (1; 51; 101; 151; 201; 251; 301) for, at least in operative condition, converting microwaves into heat, characterized by a water container (1; 51; 126; 175, 177,184; 225, 227; 275, 277; 325, 327) for keeping a volume of the water (51; 125; 175; 225; 275; 325) therein separate from the product (19; 69; 119-121; 169; 219; 292), at least in a condition prior to the generation of said microwave field in said area, the water container (1; 51; 127; 177, 184; 227; 277; 327) enclosing the water and forming a barrier for, at least prior to the heating of the water, keeping the water separate from the product (19; 69; 119-121; 169; 219; 292) and for releasing the water (125; 175; 225; 275; 325) in reaction to the heating of the water by said microwave field.
- An apparatus according to claim 6, wherein the water container is a bag (127; 227; 277; 327).
- An apparatus according to claim 7, wherein the water container is designed as a chamber (184) of said container (151), said chamber being separated by a barrier (177) from an inner space of said container for receiving a product (169).
- An apparatus according to any one of claims 6-8, wherein said barrier (127; 177; 227; 277; 327) is designed to form an opening in reaction to heating of the water.
- An apparatus according to any one of claims 6-9, wherein the energy conversion unit (1; 51) comprises a volume of a substantially form-retaining material.
- An apparatus according to claim 10, wherein water is included in said substantially form-retaining material (1; 51).
- An apparatus according to claim 11, wherein at least a portion of said water is included in pores of said substantially form-retaining material (1; 51).
- An apparatus according to claim 11 or 12, wherein at least a portion of said water is bound to a hygroscopic component of said substantially form-retaining material (1; 51).
- An apparatus according to any one of claims 6-13, further comprising a vapor-inhibiting barrier (73; 101; 151; 201; 251; 301) for obstructing the water from moving from said product (69; 119-121; 169; 219; 292).
- An apparatus according to any one of claims 6-14, wherein said substantially form-retaining material (1; 51) is composite material having a fibrous material and a binding material.
- An apparatus according to any one of claims 6-15, wherein said container (101; 151) for enveloping a product forms a substantially hermetically sealed covering and is provided with a blow-off opening (131; 181) closed off for releasing said opening (131; 181) in reaction to the exceeding of a given excess pressure within the container (101; 151) relative to the surroundings.
- An apparatus according to any one of claims 6-16, wherein said container (201) for enveloping the product is designed as a box (203) having an upper side closed by a transparent cover (235), said shield (208) for shielding the product (219) from microwaves comprising a lid (202) located at a bottom side of said container (201) and engaging said box (203), and said box (203) and said cover (202) being designed to close said box (203) after removal of said sheet, by placing said lid (202) on said top side of said box (203).
- An assembly of at least one product (69; 119-121; 169; 219; 292) intended for consumption and a package (51; 101; 151; 201; 251; 301) in which said at least one product (69; 119-121; 169; 219; 292) is packaged, further comprising at least one shield (58; 108; 158; 208; 258; 308) for shielding said at least one product (69; 119-121; 169; 219; 292) against microwaves and water (51; 125; 175; 225; 275; 325) which, at least in an operative condition, is located outside said shield and in said package for converting microwaves into heat, said water (51; 125; 175; 225; 275; 325) being located in an energy conversion unit (1; 51; 126; 175, 177,184; 225,227; 275, 277; 325, 327) for keeping said water (51; 125; 175; 225; 275; 325) therein separate from the product (19; 69; 119-121; 169; 219; 292), at least in a condition prior to the generation of said microwave field in said area, wherein the energy conversion unit (1; 51; 126; 175, 177, 184; 225, 227; 275,277; 325, 327) comprises a water container (1; 51; 127; 177, 184; 227; 277; 327) enclosing the water, said water container forming a barrier for, at least prior to the heating of the water, keeping the water separate from the product (19; 69; 119-121; 169; 219; 292) and for releasing the water (125; 175; 225; 275; 325) in reaction to the heating of the water by said microwave field.
- An assembly according to claim 18, wherein said at least one product is an egg (69) with an egg shell (70) and wherein said package forms a container (51) from a substantially form-retaining material and wherein the material of said container (51), at least in an operative condition, contains the water (51) for converting microwaves into heat.
- An assembly according to claim 19, wherein said at least one egg (69) carries said at least one shield (58) against microwave radiation and wherein said shield tightly encloses the egg shell of the egg (69).
- An assembly according to claim 20, wherein said at least one shield (58) is designed as a sheet-shaped covering of said at least one egg (69).
- An assembly according to claim 20 or 21, wherein said at least one shield is designed as a layer of electrically conductive material provided on the egg.
- An assembly according to claim 22, wherein said layer of electrically conductive material is applied by vaporization.
- An assembly according to any one of claims 26-31, wherein said at least one shield (58) against microwave radiation is provided with passages (74).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL1011443 | 1999-03-04 | ||
NL1011443A NL1011443C2 (en) | 1999-03-04 | 1999-03-04 | Preparation of boiled eggs in a microwave oven. |
PCT/NL2000/000147 WO2000052969A1 (en) | 1999-03-04 | 2000-03-06 | Heating a product intended for consumption in a microwave apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1159856A1 EP1159856A1 (en) | 2001-12-05 |
EP1159856B1 true EP1159856B1 (en) | 2003-10-01 |
Family
ID=19768756
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00909792A Expired - Lifetime EP1159856B1 (en) | 1999-03-04 | 2000-03-06 | Heating a product intended for consumption in a microwave apparatus |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1159856B1 (en) |
AT (1) | ATE251378T1 (en) |
AU (1) | AU3197700A (en) |
CA (1) | CA2373125A1 (en) |
DE (1) | DE60005648T2 (en) |
NL (1) | NL1011443C2 (en) |
WO (1) | WO2000052969A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL1016154C2 (en) * | 2000-09-12 | 2002-03-13 | Marinus Giovanni Poortvliet | Accessory to enable whole egg to be cooked in microwave oven, uses an electrically conductive aluminum foil bag with a number of perforations through with radiation can pass |
EP1917867A1 (en) * | 2006-10-13 | 2008-05-07 | Koninklijke Philips Electronics N.V. | Method and package for cooking eggs in a microwave oven |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4439656A (en) * | 1981-04-06 | 1984-03-27 | The Stouffer Corporation | Apparatus and method for the reconstitution of frozen foods in a microwave oven |
US4413167A (en) * | 1982-01-11 | 1983-11-01 | Raytheon Company | Microwave egg cooker |
US4894247A (en) * | 1987-12-11 | 1990-01-16 | E. I. Du Pont De Nemours And Company | Fibrous microwave susceptor package |
US5144106A (en) * | 1988-03-09 | 1992-09-01 | Kraft General Foods, Inc. | Microwave cooking utensil employing two different microwave susceptors |
US5432324A (en) * | 1994-03-28 | 1995-07-11 | Freewald; Michael J. | Microwave cooking systems for releasing moisture |
-
1999
- 1999-03-04 NL NL1011443A patent/NL1011443C2/en not_active IP Right Cessation
-
2000
- 2000-03-06 DE DE60005648T patent/DE60005648T2/en not_active Expired - Fee Related
- 2000-03-06 AU AU31977/00A patent/AU3197700A/en not_active Abandoned
- 2000-03-06 CA CA002373125A patent/CA2373125A1/en not_active Abandoned
- 2000-03-06 WO PCT/NL2000/000147 patent/WO2000052969A1/en active IP Right Grant
- 2000-03-06 AT AT00909792T patent/ATE251378T1/en not_active IP Right Cessation
- 2000-03-06 EP EP00909792A patent/EP1159856B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
WO2000052969A1 (en) | 2000-09-08 |
EP1159856A1 (en) | 2001-12-05 |
DE60005648D1 (en) | 2003-11-06 |
DE60005648T2 (en) | 2004-07-29 |
CA2373125A1 (en) | 2000-09-08 |
ATE251378T1 (en) | 2003-10-15 |
AU3197700A (en) | 2000-09-21 |
NL1011443C2 (en) | 2000-09-05 |
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