WO1992000899A1 - Package with microwave induced insulation chambers - Google Patents
Package with microwave induced insulation chambers Download PDFInfo
- Publication number
- WO1992000899A1 WO1992000899A1 PCT/US1991/004610 US9104610W WO9200899A1 WO 1992000899 A1 WO1992000899 A1 WO 1992000899A1 US 9104610 W US9104610 W US 9104610W WO 9200899 A1 WO9200899 A1 WO 9200899A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- package
- chambers
- microwave
- outer sheets
- chamber
- Prior art date
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
- B65D81/38—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 with thermal insulation
- B65D81/3888—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 with thermal insulation wrappers or flexible containers, e.g. pouches, bags
- B65D81/3897—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 with thermal insulation wrappers or flexible containers, e.g. pouches, bags formed of different materials, e.g. laminated or foam filling between walls
-
- 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
- B65D81/3461—Flexible containers, e.g. bags, pouches, envelopes
- B65D81/3469—Pop-corn bags
-
- 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
- B65D2581/3455—Packages having means for improving the internal circulation of air
- B65D2581/3458—Convective heating chambers, e.g. hot air channels
-
- 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
- the present invention relates to packaging and more particularly to packaging for heating foods in a microwave oven.
- the present invention provides an improved microwave heating package with at least one and preferably a multiplicity of latent, uninflated or potential insulation chambers capable of becoming inflating when exposed to microwave energy.
- the package includes a package-enclosing wall having inflatable means in the wall adapted to expand the thickness of the wall upon exposure to microwave energy.
- the wall includes two sheets of material including at least one flexible sheet. The sheets are bonded together at selected points, patches or along seal lines with unsealed areas between them to define unfilled inflation chambers between the lines, patches or points.
- a microwave susceptor is preferably placed adjacent to the potential inflation chambers. Upon exposure to microwave energy, the package and its contents become heated. As a result of this heating process, the unfilled chambers between the patches, points or seal lines also become heated, causing them to become filled with heated air or vapor.
- Figure 1 is a perspective view of a package embodying one form of the invention
- Figure 2 is a transverse sectional view taken on line 2-2 of Figure 1;
- Figure 3 is a side view of the package of Figure 1 as it appears after being heated in a microwave oven;
- Figure 4 is a perspective view partly broken away of another form of the invention;
- Figure 5 is a partial transverse sectional view taken on line 5-5 of Figure 4 with the outer wall of the package partially drawn back;
- Figure 6 is an enlarged cross-sectional view of a portion of a package in accordance with the invention showing inflation chambers in unexpanded and expanded condition (dotted lines);
- Figure 7 is a bar chart comparing the popped volume of popcorn popped in a package with and without the present invention.
- Figure 8 is a similar to Figure 7 but compares the percent of kernels that are popped
- Figures 9 and 10 are similar to Figures 7 and 8 but show results achieved with a different microwave oven.
- FIGs 1, 2 and 3 illustrate a package, in this case a collapsible bag 10 embodying the invention.
- the bag 10 is formed from paper and includes a lower face 12, an upper face 14, gussets 16 and 18, and a bottom seal 17. Before the bag 10 is filled with food, it is open at one end which serves as a mouth 15.
- the bag 10 can be filled through the mouth 15 with any suitable food 20 such as a charge of unpopped popcorn and shortening which is to be popped within the bag 10 by microwave energy supplied by a microwave oven.
- the mouth 15 of the package is then sealed shut.
- the bottom wall or lower face 12 of the bag is shown in Figure 1. During the popping operation the bag 10 is oriented so that the bottom wall 12 faces downwardly with the food 20 in contact with it as shown in figures 2 and 3.
- the bag 10 is made up of flexible outer and inner layers of paper 22 and 24 which are glued, i.e. laminated, together by means of an adhesive 28.
- the pattern of adhesive 28 is provided such that there exists a series of strips, dots or patches of adhesive 28a separated by areas with no adhesive 28b. This provides several latent or potential inflation chambers C.
- the sheets 22 and 24 can, for example, comprise 30 lb. bleached kraft paper and 30 lb. greaseproof kraft paper, respectively.
- the adhesive 28 can comprise a suitable heat-resistaht adhesive such as a vinyl chloride emulsion adhesive, an ethylene vinyl chloride emulsion adhesive or a polyvinylacetate polymer emulsion adhesive such as Duracet-12 ® adhesive manufactured by Franklin International, Inc. of
- the other adhesive 28a can be applied in any suitable manner, for example by a patterned adhesive applicator roll (not shown) .
- a susceptor 26 of any suitable known construction, for example a flexible sheet of plastic film having a microwave interactive coating on one or both surfaces.
- the susceptor 26 be located adjacent to the food 20 and that the expandable chambers C be on the opposite side of the susceptor 26 from the food 20 to maximize heat transmission to the food and minimize loss to the oven floor F.
- Microwave interactive susceptors of various compositions are well known to the art for heating food. Examples are described in patents 4,735,513; 4,878,765; 4,190,757 and 4,267,420. It will be seen in Figure 2 that the sheets 22 and 24 are laminated together in flat condition. That is to say, with the adjacent surfaces at the location of the unbonded areas 28b which define the latent chambers C either in contact or nearly in contact.
- the susceptor 26 typically reaches a temperature of about 325°F to 400°F, and at this temperature, air and moisture vapor present in the unexpanded chambers can expand to ten times their original volume. It will be noted that no additional material is required to provide the insulation chambers C. Moreover, the insulation layer provided by the chambers C does not rigidify the package as a layer of corrugated cardboard will do as described in patent 4,219,573. In addition, the food can be chilled or frozen as efficiently as in an uninsulated package.
- the chambers C tend to shape the package 10 and act as a conical truss or form for concentrating the charge of popcorn and shortening 20 at a center point.
- a series of elongated parallel chambers C are employed, they will help to unfold the bag 10 which is shipped in a folded condition as they inflate during the microwave heating process.
- the susceptor coating will contain a microwave interactive heating substance in particulate form which is bonded to the sheet 24 as a part of the coating which makes up the susceptor 26.
- the bag is self-insulating, the height of the chambers C providing insulation. Since nothing is added, the bag 10 remains supple, flexible, pliable and foldable. This is important since the ends of the bag 10 are folded over a center portion containing the popcorn 20. It will also be noted that the insulation is formed dynamically during the microwave heating.
- a moisture or vapor releasing substance can be provided in the susceptor 26 or at least in communication with the chambers C to release gas, vapor or fumes during the heating process.
- a moisture or vapor releasing substance can be provided in the susceptor 26 or at least in communication with the chambers C to release gas, vapor or fumes during the heating process.
- a vapor-releasing mineral hydrate as described in U.S. patent application SN 07/456,159 entitled MICROWAVE SUSCEPTOR WITH ATTENUATOR FOR HEAT CONTROL.
- the size or amount of the susceptor 26 can be reduced in some cases, which is an advantage under certain conditions, for example when the susceptor 26 tends to burn or scorch the package.
- Figures 4, 5 and 6 wherein the same numerals refer to corresponding parts in the embodiment illustrated above.
- the inflation chambers C have a different pattern.
- the inflation chambers C comprise a plurality of relatively small blisters arranged in rows.
- the bag indicated generally at 11 includes a lower face 12, an upper face 14, gussets 16 and 18, and susceptor 26 as described above.
- Adhesive 28 is employed for bonding the sheets 22 and 24 together.
- the adhesive 28 is arranged as a plurality of circles of adhesive 28a having adhesive-free areas 28b between them. Before heating, the condition of the latent inflation chambers C is shown as narrow spaces between the circles of adhesive 28a.
- the heat produced by the microwave energy, and particularly that produced by the susceptor 26, will cause the latent or potential inflation chambers C corresponding to the adhesive-free areas 28b to expand as shown by dotted lines in Figure 6 and solid lines in Figure 4 to produce the inflation chambers C which provide an insulating effect for reducing heat loss from the food and the susceptor 26.
- the invention can be used in connection with a variety of foods, such as popcorn, pizza, french fries, griddle food (e.g. french toast, pancakes, waffles), rolls, doughnuts and the like. Since the sheets of paper 22 and 24 are flexible, they are better able to conform to the surface of an irregularly shaped food product, such as the lower surface of a pizza crust, than a flat stiff object such as a sheet of corrugated cardboard. This promotes heat transmission into the food.
- FIGs 7-8 show the effectiveness of the invention in popping popcorn in a microwave oven, in this case a GE 479-watt oven.
- Fifty-six grams of unpopped popcorn and 23.5 grams of shortening were placed in a bag having a height of 11 inches and width of 4 1/2 inches, and popped. It can be seen that by providing a susceptor and a full lamination, i.e. fully bonded between the sheets, a volume increase of from 1200 ml to 1600 ml is achieved. However, by using the invention, an additional increase from 1600 ml to about 1800 ml is achieved, a mean volume increase of about 19%. A similar increase is achieved in the percent of the kernels that are popped, as shown in Figure 8.
- Figures 9 and 10 illustrate popping of popcorn in a Litton 975-watt oven.
- the volume of popped corn is about 1600 ml.
- the volume increases to about 1900 ml.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR919106625A BR9106625A (en) | 1990-07-11 | 1991-06-27 | PACKAGING WITH MICROWAVE-INDUCED INSULATION BEDS |
JP91511578A JPH05507898A (en) | 1990-07-11 | 1991-06-27 | Package with microwave induced insulation chamber |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US550,993 | 1990-07-11 | ||
US07/550,993 US5081330A (en) | 1990-07-11 | 1990-07-11 | Package with microwave induced insulation chambers |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1992000899A1 true WO1992000899A1 (en) | 1992-01-23 |
Family
ID=24199394
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1991/004610 WO1992000899A1 (en) | 1990-07-11 | 1991-06-27 | Package with microwave induced insulation chambers |
Country Status (11)
Country | Link |
---|---|
US (1) | US5081330A (en) |
EP (1) | EP0537213A1 (en) |
JP (1) | JPH05507898A (en) |
CN (1) | CN1058938A (en) |
AU (1) | AU8093491A (en) |
BR (1) | BR9106625A (en) |
CA (1) | CA2085903A1 (en) |
IL (1) | IL98734A0 (en) |
MX (1) | MX9100159A (en) |
WO (1) | WO1992000899A1 (en) |
ZA (1) | ZA915210B (en) |
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US8686322B2 (en) | 2008-08-14 | 2014-04-01 | Graphic Packaging International, Inc. | Microwave heating construct with elevatable bottom |
US8853601B2 (en) | 2006-03-31 | 2014-10-07 | Graphic Packaging International, Inc. | Microwavable construct for heating, browning, and crisping rounded food items |
US9278795B2 (en) | 2006-07-27 | 2016-03-08 | Graphic Packaging International, Inc. | Microwave heating construct |
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US4713510A (en) * | 1986-06-25 | 1987-12-15 | International Paper Co. | Package for microwave cooking with controlled thermal effects |
US4705927A (en) * | 1986-08-14 | 1987-11-10 | Aluminum Company Of America | Cooking utensil for combined microwave and steam cooking |
-
1990
- 1990-07-11 US US07/550,993 patent/US5081330A/en not_active Expired - Lifetime
-
1991
- 1991-06-27 WO PCT/US1991/004610 patent/WO1992000899A1/en not_active Application Discontinuation
- 1991-06-27 JP JP91511578A patent/JPH05507898A/en active Pending
- 1991-06-27 AU AU80934/91A patent/AU8093491A/en not_active Abandoned
- 1991-06-27 EP EP91911797A patent/EP0537213A1/en not_active Ceased
- 1991-06-27 CA CA002085903A patent/CA2085903A1/en not_active Abandoned
- 1991-06-27 BR BR919106625A patent/BR9106625A/en unknown
- 1991-07-04 IL IL98734A patent/IL98734A0/en unknown
- 1991-07-05 ZA ZA915210A patent/ZA915210B/en unknown
- 1991-07-10 MX MX9100159A patent/MX9100159A/en unknown
- 1991-07-11 CN CN91105641A patent/CN1058938A/en active Pending
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US3098563A (en) * | 1960-10-03 | 1963-07-23 | Hugh B Skees | Inflatable heat insulating material |
FR2320243A1 (en) * | 1975-08-06 | 1977-03-04 | Oriol Jean Rene | Inflatable insulated storage container - has outer flexible envelope filled through valve in side and inner envelope filled through plug in top |
US4219573A (en) * | 1979-02-26 | 1980-08-26 | The Pillsbury Company | Microwave popcorn package |
US4797010A (en) * | 1987-09-22 | 1989-01-10 | Nabisco Brands, Inc. | Reheatable, resealable package for fried food |
US4904488A (en) * | 1988-03-29 | 1990-02-27 | Nabisco Brands, Inc. | Uniformly-colored, flavored, microwaveable popcorn |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2181939A3 (en) * | 2002-02-08 | 2010-08-04 | Graphic Packaging International, Inc. | Insulating microwave interactive packaging |
WO2007123611A1 (en) * | 2006-03-31 | 2007-11-01 | Graphic Packaging International, Inc. | Microwavable construct for heating, browning, and crisping rounded food items |
US8853601B2 (en) | 2006-03-31 | 2014-10-07 | Graphic Packaging International, Inc. | Microwavable construct for heating, browning, and crisping rounded food items |
US9278795B2 (en) | 2006-07-27 | 2016-03-08 | Graphic Packaging International, Inc. | Microwave heating construct |
US8686322B2 (en) | 2008-08-14 | 2014-04-01 | Graphic Packaging International, Inc. | Microwave heating construct with elevatable bottom |
DE102020201884B4 (en) | 2019-02-15 | 2021-12-23 | Virtek Vision International Ulc | PROCEDURE OF DETECTING PROPER ORIENTATION OF MATERIAL APPLICATION |
Also Published As
Publication number | Publication date |
---|---|
EP0537213A1 (en) | 1993-04-21 |
AU8093491A (en) | 1992-02-04 |
US5081330A (en) | 1992-01-14 |
CA2085903A1 (en) | 1992-01-12 |
ZA915210B (en) | 1993-02-24 |
IL98734A0 (en) | 1992-07-15 |
JPH05507898A (en) | 1993-11-11 |
MX9100159A (en) | 1992-02-28 |
BR9106625A (en) | 1993-06-01 |
CN1058938A (en) | 1992-02-26 |
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