WO1997036797A1 - Microwave oven utensils - Google Patents

Microwave oven utensils Download PDF

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Publication number
WO1997036797A1
WO1997036797A1 PCT/GB1997/000924 GB9700924W WO9736797A1 WO 1997036797 A1 WO1997036797 A1 WO 1997036797A1 GB 9700924 W GB9700924 W GB 9700924W WO 9736797 A1 WO9736797 A1 WO 9736797A1
Authority
WO
WIPO (PCT)
Prior art keywords
receptacle
total weight
microwave oven
absorbent filler
container
Prior art date
Application number
PCT/GB1997/000924
Other languages
French (fr)
Inventor
Keith Pickford
Original Assignee
Novus Foods Ltd.
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 Novus Foods Ltd. filed Critical Novus Foods Ltd.
Priority to US09/381,848 priority Critical patent/US6326599B1/en
Priority to AU23004/97A priority patent/AU2300497A/en
Publication of WO1997036797A1 publication Critical patent/WO1997036797A1/en

Links

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
    • 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
    • B65D2205/00—Venting means
    • 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
    • B65D2581/3463—Means for applying microwave reactive material to the package
    • B65D2581/347—Microwave reactive material moulded with the container, e.g. as a filler in thermoplastics
    • 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
    • B65D2581/3479—Other metallic compounds, e.g. silver, gold, copper, nickel
    • 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
    • B65D2581/3483—Carbon, carbon black, or graphite
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S99/00—Foods and beverages: apparatus
    • Y10S99/14—Induction heating

Definitions

  • This invention relates to utensils of the type suitable for use in a microwave oven.
  • the invention relates particularly but not exclusively to food containers which can be placed in a microwave oven to heat or reheat a food product .
  • Microwave ovens are quick and convenient for cooking or heating of foods.
  • ready prepared foods can be reheated in a matter of minutes. This has lead ( to the creation and rapid growth of "convenience foods" - ready prepared foods or meals which have been cooked or partially cooked and which only require reheating in a microwave oven.
  • Convenience foods may be? packaged in containers which are suitable for use in a microwave oven, obviating any need to empty the food into another container for reheating. Some products are packaged in such a way that the reheated food can be eaten directly from the container, which container may be disposed of after use.
  • a microwave oven food container comprises a receptacle for a foodstuff, the receptacle being composed of a polymeric material including a radiation absorbent filler.
  • the filler may comprise carbon, for example particulate carbon black or comminuted carbon fibres or mixtures thereof. Metal particles may also be employed as a filler .
  • Preferred polymeric materials include polyolefins including polyethylene, polypropylene, polyethylene teraphthalate and copolymers and blends thereof.
  • NOVA EN 1102J BASF
  • Preferred polymeric materials may be pigmented with carbon black.
  • a master blend of polypropylene and carbon black may be prepared for dilution with further polypropylene to give a desired loading of the carbon filler.
  • polypropylene may be blended with carbon black in a particle size of 20 nm to give a 40% loading.
  • the master blend may be diluted to give a loading of 2 to 20% in the final product .
  • a radiation absorbent filler for example particulate carbon has been found to increase the heating efficiency of a microwave oven. Reflection and absorption of radiation reduces formation of cold spots in the food product. Furthermore the container can become hot during irradiation so that heat transmission from the container to the food product may continue after cessation of the irradiation cycle. Drying and crisping are enhanced in comparison to an unfilled container.
  • the receptacle comprises a base and one or more sides.
  • the base may be generally flat or planar but may be formed with recesses and raised * portions .
  • Our copending application PCT/GB96/00128 discloses an arrangement wherein a multiplicity of protrusions extending from the base are arranged to support the food product, facilitating reflection and deflection of microwave and thermal radiation towards the latter.
  • the container comprises a receptacle and a closure, preferably a lid.
  • the closure may be secured to the receptacle by means of a hinge and may be adapted to be closed by means of a catch, j clip or other arrangement.
  • the container and closure may be arranged to define one or more apertures adapted to permit egress of steam from the container in use.
  • a microwave oven utensil is composed of a polymeric material including a radiation absorbent filler as described above.
  • the utensil may comprise a container, tray or cover for use in a microwave oven.
  • a polymeric material including a radiation absorbent filler, preferably carbon for manufacture of a microwave oven container or other utensil.
  • Sheet polymeric material was formed containing 2%, 5%, 10% and 20% of a master batch of polypropylene. Up to 40% of carbon may be employed, ie undiluted master batch. The sheet material was formed into D2 type trays. The master batch comprised 40% food grade carbon black and 60% NOVALEN 1102J food grade polypropylene.
  • Tests were carried out to demonstrate the heating of food products in comparison to conventional unfilled polypropylene trays of the same dimensions.
  • the conventional trays were coloured yellow. Decreased cooking times and elimination of cold spots were observed using the carbon filled polypropylene trays .
  • the fish fingers in the unfilled polymer tray were found to be more dehydrated than those in the filled polymer trays.

Abstract

A microwave oven food container in the form of a receptacle for foodstuffs. The receptacle is composed of a polymeric material containing a microwave absorbent filler, which may comprise carbon or metal particles.

Description

MICROWAVEOVEN UTENSILS
This invention relates to utensils of the type suitable for use in a microwave oven. The invention relates particularly but not exclusively to food containers which can be placed in a microwave oven to heat or reheat a food product .
Microwave ovens are quick and convenient for cooking or heating of foods. In particular ready prepared foods can be reheated in a matter of minutes. This has lead(to the creation and rapid growth of "convenience foods" - ready prepared foods or meals which have been cooked or partially cooked and which only require reheating in a microwave oven. Convenience foods may be? packaged in containers which are suitable for use in a microwave oven, obviating any need to empty the food into another container for reheating. Some products are packaged in such a way that the reheated food can be eaten directly from the container, which container may be disposed of after use.
According to a first aspect of the present invention a microwave oven food container comprises a receptacle for a foodstuff, the receptacle being composed of a polymeric material including a radiation absorbent filler.
The filler may comprise carbon, for example particulate carbon black or comminuted carbon fibres or mixtures thereof. Metal particles may also be employed as a filler .
Preferred polymeric materials include polyolefins including polyethylene, polypropylene, polyethylene teraphthalate and copolymers and blends thereof.
Use of a food grade of polypropylene is preferred, for example NOVA EN 1102J (BASF) .
Preferred polymeric materials may be pigmented with carbon black. For example a master blend of polypropylene and carbon black may be prepared for dilution with further polypropylene to give a desired loading of the carbon filler. For example polypropylene may be blended with carbon black in a particle size of 20 nm to give a 40% loading. The master blend may be diluted to give a loading of 2 to 20% in the final product .
Use of a radiation absorbent filler, for example particulate carbon has been found to increase the heating efficiency of a microwave oven. Reflection and absorption of radiation reduces formation of cold spots in the food product. Furthermore the container can become hot during irradiation so that heat transmission from the container to the food product may continue after cessation of the irradiation cycle. Drying and crisping are enhanced in comparison to an unfilled container.
In a preferred embodiment of the invention the receptacle comprises a base and one or more sides. The base may be generally flat or planar but may be formed with recesses and raised* portions . Our copending application PCT/GB96/00128 discloses an arrangement wherein a multiplicity of protrusions extending from the base are arranged to support the food product, facilitating reflection and deflection of microwave and thermal radiation towards the latter.
In preferred embodiments of the invention the container comprises a receptacle and a closure, preferably a lid. The closure may be secured to the receptacle by means of a hinge and may be adapted to be closed by means of a catch, jclip or other arrangement. The container and closure may be arranged to define one or more apertures adapted to permit egress of steam from the container in use.
According to a second aspect of the invention a microwave oven utensil is composed of a polymeric material including a radiation absorbent filler as described above. The utensil may comprise a container, tray or cover for use in a microwave oven.
According to a third aspect of the present invention there is provided use of a polymeric material including a radiation absorbent filler, preferably carbon for manufacture of a microwave oven container or other utensil.
The invention is further described by means of example but not in any limitative sense.
Sheet polymeric material was formed containing 2%, 5%, 10% and 20% of a master batch of polypropylene. Up to 40% of carbon may be employed, ie undiluted master batch. The sheet material was formed into D2 type trays. The master batch comprised 40% food grade carbon black and 60% NOVALEN 1102J food grade polypropylene.
Tests were carried out to demonstrate the heating of food products in comparison to conventional unfilled polypropylene trays of the same dimensions. The conventional trays were coloured yellow. Decreased cooking times and elimination of cold spots were observed using the carbon filled polypropylene trays .
Example 1 - Fish Finσers
Fish fingers having an average weight of 16 g were pre¬ cooked to a temperature of 11.6'C, placed off-centre in a microwave oven and the temperature was measured after cooking for one minute . The results are shown in Table 1.
Table 1
Unfilled 0.8%C 2%C 4%C 8%C Polymer |
Temperature at 86.9 88.8 84.7 86.8 85.2 Centre/ *C
Temperature at 77 89.8 84.9 84 82.6 Edge/'C
The fish fingers in the unfilled polymer tray were found to be more dehydrated than those in the filled polymer trays.
Example 2 - Turkey Burgers
Commercially available turkey burgers with a weight of 220 g for five pieces, ie average 44 g each, were pre-cooked for 1 min to -30*C and placed in trays off-centre in a microwave oven. The results are shown in Table 2. Table 2
Unfilled 0.8%C 2%C 4%C 8%C Polymer
Temperature at 19.7 25.5 33.5 35.5 28.1 Centre/*C
Temperature at 66.5 75 68.9 69.5 72 Edge/"C
eight/g 38 42 42
Example 3 - Cream Cheese
Samples of cream cheese/200 g starting temperature 11 " C were heated in a microwave oven and the results were as follows . Yellow and blue pigmented unfilled trays were used for comparison .
Figure imgf000006_0001

Claims

CLAIMS ;
1. A microwave oven food receptacle composed of a polymeric material including a radiation absorbent filler, in which the amount of radiation absorbent filler is not more than 20% of the total weight of the receptacle.
2. A receptacle as claimed in claim 1, in which the amount of radiation absorbent filler is not more than 8% of the total weight of the receptacle.
3. A receptacle as claimed in claim 1, in which the amount of radiation absorbent filler is not more than 4% of the total "weight of the receptacle.
4. A receptacle as claimed in claim 1, in which the amount of radiation absorbing filler is not more than 2% of the total weight of the receptacle.
5. A receptacle as claimed in claim 1, in which the amount of radiation absorbing filler is not more than 0.8% of the total weight of the receptacle.
6. A container as claimed in any preceding claim, in which the container has a closure.
7. A container as claimed in claim 6, in which the receptacle and closure are arranged to define one or more apertures to permit egress of steam from the container in use.
8. A microwave oven utensil composed of a polymeric material including a radiation absorbent filler.
9. A utensil as claimed in claim 8, in which the utensil is for use in a microwave oven and is selected from: a container, a tray and a cover.
10. A method of manufacturing a microwave oven utensil comprising the steps of:
(i) blending a carbon microwave absorbing filler with a polymeric material to form a master batch having a carbon microwave absorbent filler content of 40% by total weight;
(ii) blending the master batch with further polymeric material, to produce a diluted blend of polymeric material having a lower carbon microwave absorbent filler material content; and
(iii) forming the diluted blend of polymeric material into a microwave oven utensil.
11. A method as claimed in claim 10 in which the carbon microwave absorbent filler content of the diluted blend is not more than 8% by total weight of the diluted blend.
12. A method as claimed in claim 10, in which the carbon microwave absorbent filler content of the diluted blend is not more than 4% by total weight of the diluted blend.
13. A method as claimed in claim 10, in which the carbon microwave absorbent filler content of the diluted blend is not more than 2% by total weight of the diluted blend.
14. A method as claimed in claim 10, in which the carbon microwave absorbent filler content of the diluted blend is not more than 0.8% by total weight of the diluted blend.
PCT/GB1997/000924 1996-03-30 1997-03-27 Microwave oven utensils WO1997036797A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US09/381,848 US6326599B1 (en) 1996-03-30 1997-03-27 Microwave oven food receptacle
AU23004/97A AU2300497A (en) 1996-03-30 1997-03-27 Microwave oven utensils

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9606813.5 1996-03-30
GBGB9606813.5A GB9606813D0 (en) 1996-03-30 1996-03-30 Microwave oven utensils

Publications (1)

Publication Number Publication Date
WO1997036797A1 true WO1997036797A1 (en) 1997-10-09

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (4)

Country Link
US (1) US6326599B1 (en)
AU (1) AU2300497A (en)
GB (1) GB9606813D0 (en)
WO (1) WO1997036797A1 (en)

Families Citing this family (12)

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Publication number Priority date Publication date Assignee Title
JP4644122B2 (en) 2002-07-26 2011-03-02 イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニー Heat-resistant dishes for microwave ovens
GB2461520A (en) * 2008-07-01 2010-01-06 Magsnack Bv Manufacturing crumb for the coating of food products
EP2456815B1 (en) 2009-07-24 2014-07-16 Ticona LLC Thermally conductive polymer compositions and articles made therefrom
WO2011010290A1 (en) 2009-07-24 2011-01-27 Ticona Llc Thermally conductive thermoplastic resin compositions and related applications
US8765202B2 (en) * 2010-01-15 2014-07-01 Crisp Sensation Holding S.A. Coated stabilised microwave heated foods
US8728554B2 (en) * 2010-01-15 2014-05-20 Crisp Sensation Holding S.A. Stabilisation of microwave heated food substrates
GB201000647D0 (en) 2010-01-15 2010-03-03 Crisp Sensation Holding Sa Microwaveable batter
US9326536B2 (en) 2011-01-27 2016-05-03 Crisp Sensation Holding S.A. Production of microwaveable coated food products
US9326537B2 (en) 2011-01-27 2016-05-03 Crisp Sensation Holding S.A. Microwaveable coated food product, and method and apparatus for the manufacture thereof
US20130156925A1 (en) 2011-12-20 2013-06-20 Crisp Sensation Holding S.A. Crumb manufacture
US20140048531A1 (en) * 2012-08-15 2014-02-20 George R. Carthane, JR. Cooking utensil with compartments
WO2015134647A1 (en) * 2014-03-05 2015-09-11 Penn Color, Inc. Thermally-conductive salt-containing particles of carbon black and metal

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EP0344726A2 (en) * 1988-05-30 1989-12-06 Sekisui Kaseihin Kogyo Kabushiki Kaisha Polyolefin resin foamed laminate sheet and double-side vacuum forming of the same
US5088179A (en) * 1990-10-12 1992-02-18 Jmk International, Inc. Method of forming a microwaveable container
WO1994019917A1 (en) * 1993-02-22 1994-09-01 Loctite Corporation Microwaveable hot melt dispenser
WO1994027887A1 (en) * 1993-05-21 1994-12-08 James River Paper Company, Inc. Self limiting microwave susceptor
WO1995024110A2 (en) * 1994-03-04 1995-09-08 Gics & Vermee, L.P. Ovenable food package
WO1996022228A2 (en) * 1995-01-21 1996-07-25 Novus Foods Ltd. Microwave oven food container

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Publication number Priority date Publication date Assignee Title
EP0344726A2 (en) * 1988-05-30 1989-12-06 Sekisui Kaseihin Kogyo Kabushiki Kaisha Polyolefin resin foamed laminate sheet and double-side vacuum forming of the same
US5088179A (en) * 1990-10-12 1992-02-18 Jmk International, Inc. Method of forming a microwaveable container
WO1994019917A1 (en) * 1993-02-22 1994-09-01 Loctite Corporation Microwaveable hot melt dispenser
WO1994027887A1 (en) * 1993-05-21 1994-12-08 James River Paper Company, Inc. Self limiting microwave susceptor
WO1995024110A2 (en) * 1994-03-04 1995-09-08 Gics & Vermee, L.P. Ovenable food package
WO1996022228A2 (en) * 1995-01-21 1996-07-25 Novus Foods Ltd. Microwave oven food container

Also Published As

Publication number Publication date
GB9606813D0 (en) 1996-06-05
US6326599B1 (en) 2001-12-04
AU2300497A (en) 1997-10-22

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