CA2657193A1 - Microwavable package - Google Patents

Microwavable package Download PDF

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Publication number
CA2657193A1
CA2657193A1 CA002657193A CA2657193A CA2657193A1 CA 2657193 A1 CA2657193 A1 CA 2657193A1 CA 002657193 A CA002657193 A CA 002657193A CA 2657193 A CA2657193 A CA 2657193A CA 2657193 A1 CA2657193 A1 CA 2657193A1
Authority
CA
Canada
Prior art keywords
microwave energy
food product
microwavable package
heating element
apertures
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.)
Granted
Application number
CA002657193A
Other languages
French (fr)
Other versions
CA2657193C (en
Inventor
Neilson Zeng
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.)
Graphic Packaging International LLC
Original Assignee
Individual
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 Individual filed Critical Individual
Priority claimed from CA002599145A external-priority patent/CA2599145C/en
Publication of CA2657193A1 publication Critical patent/CA2657193A1/en
Application granted granted Critical
Publication of CA2657193C publication Critical patent/CA2657193C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • B65D2581/344—Geometry or shape factors influencing the microwave heating properties
    • 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
    • B65D2581/344—Geometry or shape factors influencing the microwave heating properties
    • B65D2581/3441—3-D geometry or shape factors, e.g. depth-wise
    • 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
    • B65D2581/3452—Packages having a plurality of microwave reactive layers, i.e. multiple or overlapping microwave reactive layers
    • 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
    • B65D2581/3464—Microwave reactive material applied by ink printing
    • 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
    • B65D2581/3466—Microwave reactive material applied by vacuum, sputter or vapor deposition
    • 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
    • B65D2581/3489—Microwave reflector, i.e. microwave shield
    • 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

Abstract

A microwavable package includes a base to support a food product (10). An active microwave energy heating element (14) is on the base (12) to effect heating of the food product upon impingement by microwave energy.
A cover (18) spaced from and separate to the active microwave energy heating element overlies the food product. The cover (18) includes microwave energy interactive material (34) extending substantially over the food product and at least one layer of suscepting material (36) interposed between the food product (10) and the microwave energy interactive material (34).
A plurality of apertures are formed in the microwave energy interactive material (34) and are spaced apart about a peripheral margin of the cover. The apertures are sized to promote localized fields to enhance the at least one layer of suscepting material (36) and promote browning of the food product when exposed to incident microwave energy.

Claims (45)

1. A microwavable package comprising:
a base to support a food product;
an active microwave energy heating element on said base to effect heating of a food product upon impingement by microwave energy; and a cover spaced from said active microwave energy heating element to overlie said food product, said cover including a microwave energy interactive material layer extending substantially over said food product, and a plurality of apertures in said microwave energy interactive material spaced about a peripheral margin of said cover, said apertures being sized to promote localised fields to promote browning of said food product.
2. A microwavable package as defined in claim 1 wherein said apertures are in the form of elongate slots.
3. A microwavable package as defined in claim 2 wherein said elongate slots are arranged in concentric rings.
4. A microwavable package as defined in claim 3 wherein said rings are circular.
5. A microwavable package as defined in claim 4 wherein the slots in said concentric rings are staggered.
6. A microwavable package as defined in claim 5 further including at least one layer of suscepting material on said cover and overlying said microwave energy interactive material.
7. A microwavable package as defined in claim 2 wherein microwave energy interactive material islands are located within said elongate slots.
8. A microwavable package as defined in claim 7 wherein said elongate slots are arranged in concentric rings.
9. A microwavable package as defined in claim 8 wherein said rings are circular.
10. A microwavable package as defined in claim 9 wherein the slots in said concentric rings are staggered.
11. A microwavable package as defined in claim 7 wherein each of said microwave energy interactive material islands has an aperture formed therein.
12. A microwavable package as defined in claim 11 wherein said apertures are generally decussate.
13. A microwavable package as defined in claim 1 wherein said active microwave energy heating element includes a plurality of energy collecting structures, each of said energy collecting structures including resonant loops having a perimeter sufficient to limit currents induced therein to below a predetermined level upon impingement by incident microwave energy, said energy collecting structures distribute energy towards a central region of said food product to heat generally uniformly said food product and to inhibit charring of said base.
14. A microwave package as defined in claim 13 wherein said energy collecting structures include a pair of resonant loops interconnected by transmission lines, said transmission lines being configured to provide a progressive power loss between said resonant loops.
15. A microwavable package as defined in claim 14 wherein the perimeter of said resonant loops and the length of each of said transmission lines is generally equal to an integer multiple of the effective wavelength of said incident microwave energy projected onto said microwave energy heating element.
16. A microwavable package as defined in claim 15 wherein said resonant loops are circular.
17. A microwavable package as defined in claim 16 wherein said energy collecting structures are circumferentially spaced and arranged in a ring about the center of said active element.
18. A microwavable package as defined in claim 17 wherein said active microwave energy heating element further includes a plurality of tuned structures at spaced locations and positioned between adjacent resonant loops.
19. A microwavable package as defined in claim 18 wherein said tuned structures include nested loops.
20. A microwavable package as defined in claim 19 wherein said nested loops are joined by bridges.
21. A microwavable package as defined in claim 1 further including a plurality of spaced apertures provided through said base and active microwave energy heating element to allow moisture released from said food product to pass.
22. A microwavable package as defined in claim 21 wherein said apertures are arranged in concentric rings.
23. A microwavable package comprising:
a base to support a food product;
an active microwave energy heating element interposed between said food product and said base to effect heating of said food product upon impingement by microwave energy; and a cover spaced from said active microwave energy heating element to overlie said food product, said cover including a substrate and microwave energy interactive material on said substrate to cover at least a portion of said food product, said substrate extending beyond the peripheral edge of said microwave energy interactive material to isolate electrically said base and said cover.
24. A microwavable package as defined in claim 23 wherein said microwave energy interactive material extends substantially over said food product, said cover further including at least one layer of suscepting material interposed between said food product and said microwave energy interactive material, and a plurality of apertures in said microwave energy interactive material spaced about a peripheral margin of said cover, said apertures being sized to promote localised fields to enhance said at least one layer of suscepting material and promote browning of said food product.
25. A microwavable package as defined in claim 24 wherein said apertures are in the form of elongate slots.
26. A microwavable package as defined in claim 25 wherein said elongate slots are arranged in concentric circular rings, the slots in adjacent concentric rings being staggered.
27. A microwavable package as defined in claim 26 wherein microwave energy interactive material islands are located within said elongate slots.
28. A microwavable package as defined in claim 27 wherein said elongate slots are arranged in concentric circular rings, the slots in adjacent concentric rings being staggered.
29. A microwavable package as defined in claim 28 wherein each of said microwave energy interactive material islands has an aperture formed therein.
30. A microwavable package as defined in claim 29 wherein said apertures are generally decussate.
31. A microwavable package as defined in claim 23 further including a plurality of spaced apertures provided through said base and active microwave energy heating element to allow moisture released from said food product to pass.
32. A microwavable package as defined in claim 31 wherein said apertures are arranged in concentric rings.
33. A packaged food product comprising:
a base to support said food product;
a flexible cover to overlie and conform to said food product; and a flexible wrap to constrain said base and cover and inhibit relative movement therebetween.
34. A packaged food product as defined in claim 33 wherein said base and cover are generally circular.
35. A packaged food product as defined in claim 33 wherein said food product is in the form of a pizza.
36. A packaged food product as defined in claim 35 wherein said base supports an active microwave energy heating element to effect heating of said food product upon impingement by microwave energy.
37. A packaged food product as defined in claim 32 wherein said cover is spaced from and separate to said active microwave energy heating element to overlie and conform to said food product, said cover including microwave energy interactive material extending substantially over said food product, at least one layer of suscepting material interposed between said food product and said microwave energy interactive material layer, and a plurality of apertures in said microwave energy interactive material spaced about a peripheral margin of said cover, said apertures being sized to promote localised fields to enhance said at least one layer of suscepting material and promote browning of said food product.
38. An active microwave energy heating element for a microwavable package to heat generally uniformly a food product within said package, said active microwave energy heating element comprising:
a plurality of energy collecting structures, each of said energy collecting structures including resonant loops having a perimeter sufficient to limit currents induced therein to below a predetermined level upon impingement by incident microwave energy; and a plurality of tuned structures at spaced locations and positioned between adjacent resonant loops, said energy collecting and tuned structures distributing energy across said active microwave energy heating element to heat generally uniformly said food product and inhibiting charring of said microwavable package.
39. An active microwave energy heating element as defined in claim 38 wherein said energy collecting structures include a pair of resonant loops interconnected by transmission lines, said transmission lines being configured to provide a progressive power loss between said resonant loops.
40. An active microwave energy heating element as defined in claim 39 wherein the perimeter of said resonant loops and the length of each of said transmission lines is an integer multiple of the effective wavelength of said incident microwave energy.
41. An active microwave energy heating element as defined in claim 38 wherein said resonant loops are circular and wherein said energy collecting structures are circumferentially spaced and arranged in a ring about the center of said active element.
42. An active microwave energy heating element as defined in claim 38 wherein said tuned structures include nested loops.
43. An active microwave energy heating element as defined in claim 42 -21'-wherein inner and outer loops of said nested loops are joined by bridges.
44. A microwavable package comprising:
a tray having a base and an active microwave energy heating element on said base to effect heating of a food product on said tray upon impingement by microwave energy; and a plurality of spaced apertures in said tray to permit moisture released from a food product to pass through said tray.
45. A microwavable package as defined in claim 44 wherein said apertures are arranged in concentric rings.
CA2657193A 1996-08-26 1997-08-26 Microwavable package Expired - Fee Related CA2657193C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US70309896A 1996-08-26 1996-08-26
US08/703,098 1996-08-26
CA002599145A CA2599145C (en) 1996-08-26 1997-08-26 Microwavable package

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CA002599145A Division CA2599145C (en) 1996-08-26 1997-08-26 Microwavable package

Publications (2)

Publication Number Publication Date
CA2657193A1 true CA2657193A1 (en) 1998-03-05
CA2657193C CA2657193C (en) 2012-04-24

Family

ID=24824006

Family Applications (2)

Application Number Title Priority Date Filing Date
CA2657193A Expired - Fee Related CA2657193C (en) 1996-08-26 1997-08-26 Microwavable package
CA002264123A Expired - Fee Related CA2264123C (en) 1996-08-26 1997-08-26 Microwavable package

Family Applications After (1)

Application Number Title Priority Date Filing Date
CA002264123A Expired - Fee Related CA2264123C (en) 1996-08-26 1997-08-26 Microwavable package

Country Status (6)

Country Link
US (2) US6251451B1 (en)
EP (2) EP0958196B1 (en)
AU (1) AU4006197A (en)
CA (2) CA2657193C (en)
DE (1) DE69735004T2 (en)
WO (1) WO1998008752A2 (en)

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EP1655240A1 (en) 2006-05-10
WO1998008752A3 (en) 1998-06-18
EP0958196B1 (en) 2005-12-28
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US6251451B1 (en) 2001-06-26
WO1998008752A2 (en) 1998-03-05
CA2657193C (en) 2012-04-24
CA2264123C (en) 2007-01-16
US20010021405A1 (en) 2001-09-13
DE69735004D1 (en) 2006-02-02
AU4006197A (en) 1998-03-19

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