CA2130823A1 - Microwave food heating package with accordion pleats - Google Patents

Microwave food heating package with accordion pleats

Info

Publication number
CA2130823A1
CA2130823A1 CA002130823A CA2130823A CA2130823A1 CA 2130823 A1 CA2130823 A1 CA 2130823A1 CA 002130823 A CA002130823 A CA 002130823A CA 2130823 A CA2130823 A CA 2130823A CA 2130823 A1 CA2130823 A1 CA 2130823A1
Authority
CA
Canada
Prior art keywords
susceptor
food
package
microwave
segments
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.)
Abandoned
Application number
CA002130823A
Other languages
French (fr)
Inventor
Sara J. Risch
Lawrence C. Brandberg
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.)
Golden Valley Microwave Foods Inc
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
Publication of CA2130823A1 publication Critical patent/CA2130823A1/en
Abandoned legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D81/00Containers, 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
    • B65D81/34Containers, 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
    • B65D81/3446Containers, 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
    • B65D81/3453Rigid containers, e.g. trays, bottles, boxes, cups
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D77/00Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/003Articles enclosed in rigid or semi-rigid containers, the whole being wrapped
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D81/00Containers, 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
    • B65D81/34Containers, 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
    • B65D81/3446Containers, 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
    • B65D81/3461Flexible containers, e.g. bags, pouches, envelopes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D2581/00Containers, 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
    • B65D2581/34Containers, 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
    • B65D2581/3401Cooking or heating method specially adapted to the contents of the package
    • B65D2581/3402Cooking or heating method specially adapted to the contents of the package characterised by the type of product to be heated or cooked
    • B65D2581/3412Cooking fried food
    • B65D2581/3413Fish sticks or french fries
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D2581/00Containers, 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
    • B65D2581/34Containers, 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
    • B65D2581/3437Containers, 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
    • B65D2581/3439Means for affecting the heating or cooking properties
    • B65D2581/344Geometry or shape factors influencing the microwave heating properties
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D2581/00Containers, 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
    • B65D2581/34Containers, 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
    • B65D2581/3437Containers, 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
    • B65D2581/3463Means for applying microwave reactive material to the package
    • B65D2581/3466Microwave reactive material applied by vacuum, sputter or vapor deposition
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D2581/00Containers, 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
    • B65D2581/34Containers, 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
    • B65D2581/3437Containers, 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
    • B65D2581/3471Microwave reactive substances present in the packaging material
    • B65D2581/3472Aluminium or compounds thereof
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D2581/00Containers, 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
    • B65D2581/34Containers, 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
    • B65D2581/3437Containers, 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
    • B65D2581/3486Dielectric characteristics of microwave reactive packaging
    • B65D2581/3494Microwave susceptor
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S99/00Foods and beverages: apparatus
    • Y10S99/14Induction heating

Abstract

A microwave food heating package (10) for food pieces (44) such as french fried potatoes or fish sticks is described. The package (10) includes one or more susceptor sheets (42) folded in alternately opposite directions to provide accordion folds (41) therein which define V-shaped pockets that serve as heating chambers for individual pieces (44) of food. The susceptor sheet (42) is formed from a microwave energy-absorbing material adapted to heat, brown or crispen the surfaces of the food sticks (44). The heating chambers preferably enclose the food sticks (44) on all major surfaces and can be made by layering, i.e., stacking, segments of the accordion-pleated susceptor sheet material (42) one above another to form individual heating chambers for the food pieces (44) to crispen, toast or brown their surfaces during heating.

Description

W093/17532 PCT~U~93/017~1 ;
. ) ~ r_~

MICROWAVE FOOD ~EATING PACKAGE
WITH ACCORDION PLEATS

FIELD OF THE INVENTION
The present invention relates to a microwave food heating package and more particularly to a food heating package containing a folded microwa~e interactive susceptor sheet that enhances the heating of food in a microwave oven.

BACK~ROUND OF THE INVENTION -~
A number of devices have been developed to enhance -~
the taste and aesthetic quality of food cooked in microwave ovens either by ensuring uniform heat circulation ~Patent 4,121,510), by browning and searing foods through creating and control of electrical fields .
using conductive metals (Patent 3~946,187~ or by `~-converting microwave energy, by way of resistive film, 20 to he~t energy which is transferred to the food surface .
by way of a corrugated metal sheet (Patent 4,398,077~. :
These devicPs are all cooking utensils. By contrast, the invention is concerned with disposable packaging, : typically formed ~from paper and plastic film.
: 25 Lami~ated sheets:known as susceptors have been previously proposed for heating foods with microwave : energy by absor~ing a portion of the microwave energy : and transferring it by conduction to a food product. In some cases she~t~material of this kind from which ~he : ; 30 susceptor is formed is stiff, brittl.e, subject to breakage, and not;adapted~for use ~n lightweight :.
: ~ pack~ging products which should be disposable and low in CQS~, In other cases the laminated susceptors, while : interacting with the microwave energy present in an o~en, do not adequately heat the food product. Still other laminates can heat only one side of the food ~.
product. So, for example, if the food product is recta~gular in shape, two or more sides remain unheated.
The application of heat to at least two sides of ;~
each piece of f~od, and more preferably to all sides, is hi-ghly beneficial because it has been found that when a food piece such as a french fried potato is placed in an ~`
ordinary paperboard carton and heated in a microwave oven, the potato pieces become soggy. This occurs even -if an effort is made to allow steam to ~ent from openings at the top of the package. As a result, attempts have been made to develop susceptors for lining 10 food cartons to augment the heat provided by direct -`
microwave interaction with the food. For example, Patents 4,612~431 and 4,735,513 describe laminates comprised of polyester to which thin, semiconductive layers of metal have been applied. These laminates are bonded to a wall of the package for absorbing microwave energy and transferring the energy to the food product as heat. Tests have shown, however, that these laminates and the resulting packages are not eflective in crisping, browning or toasting the surface of foods ;~ 20 such as french fried~potatoes where there are numerous pieces of food present in the package. Thus, after heating,~ the products are perceived to be moist, limp and~soggy.
Other attempts have been made to deal with the .
25 problem of crisping the surface of a food product. For example, Patents 4,267,420 and 4,230,924 provide a *
lightweight flexible wrapper formed from a laminate composed of a ~lexible sheet material that interacts with microwa~e energy. ~ne major shortcoming i5 that 30 food sticks have to be individually wrapped and later unwrapped onè-by-one by~the consumer. Another problem -results from the fact that portions of the sheet materia~, when unsupported, can shri~el, shrink, split and cra k, particularly in areas where it is not in 35 contact with the focd.
Patents 4,935,592 and 5,084,601 address the objectives of 1) providing a microwave interactive laminate or susceptor as a sheet of material that will crisp, toast or brown several surfaces of a stick-shaped food product such as french fried potatoes , fish sticks ;~:
and the like so that after heating it is perceived to be crisp and appetizing to the consumer; and 2) configuring this microwave interactive sheet material within a package to furnish a plurality of compartments that will each enclose individual food pieces, and particularly -~
food in stick form such as french fried potatoes or the .
10 like, snugly enough to contact or almos~ contact and .
heat the food pieces~ on all major sides but yet hold the food pieces sufficiently loose to~allow the food pieces .
to be easily removed.
The package described in patent 5,084,601, while :
15 very good, is somewhat complica~ed and expensive to 'e~', : manufacture and has been perceived by consumers to :~
contain too much packaging material. Therefore, one major objective of the present invention is to provide a :~
: ~simpler and lower cost package that uses less material, is lighter in weight to~serve as a disposable package : suitable for heating individual se~vings of stick or log ~:
shaped foods such as french fried potatoes, fish sticks, ~::
egg rolls, bread ~sticks or waffle sticks in a microwave oven and for browningj crisping or toasting the surface of each food piece.

SUNMARY OF THE ~ INVENTION
The present inven~ion provides a microwave food heating package containing at least one microwave ;~
interacti~e susceptor which is folded or pleated in an :~ accordion-style fashion and is preferably con~îgured in :~
layered segments to~provide a plurality of self- ::
supporting, parallel, elongated t-~pically rectangularly shaped chambers~that are inclined, i.e., tipped on an edge, with respect to the plane or planes in which they :~: are aligned so as to~appear generally diamond-shaped.
~ach chamber encloses an individual piece of food .

W093/1753 ~ c) PCT/US93/01721 product which preferably contacts or almost contacts the ;;
chamber on four sides to enhance heating in a microwave oven. In one form of the invention,^the assembled susceptor segments and food are enclosed in a carton andtor overwrap. In another form, the assembled susceptor segments and food are held in pla~e by a surrounding paper band. In a third form, the susceptor assembly and food is contained in a paper or plastic film pouch. -~
The folded susceptor segments are preferably arranged in layers; e.g., by being folded over one another so that the segments are stacked in verti~ally spaced apart parallel planes. Alternatively, the susceptor segments can be discontinuous, separate susceptor sheets, arranged one above another; i.e., s`t cked as separate sheets in vertically spaced apart parallel planes.
Each susceptor segment can be made from any suitable known microwave interactive material such as a metal or 20 carbon-containing layer bonded to a supporting sheet. ~, ~; ~ One preferred sus~eptor is a laminate formed of a ;~ metallized polyester film adhesively bonded between two paper sheets. Por example, the metallized polyester sheet or a sheet: containing other microwave interactive 25 -material which becomes hot in a microwave oven, such as a metal, metal oxide~, carbon or the like, can be bonded between a shee~t of greaseproof paper and a sheet of kraft paper. T~is laminate is folded into accordion-; style or zigzag pleats to provide a susceptor segment having a plurality of laterally spaced apart, parallelV-shaped pockets for the food pieces. When the segments a~e place next to~one~another in parallel planes, they form parallel chambers for~loosely holding the food pieces so that the food pieces can be easily removed from the chambers by sliding them out of one end when they are to be eaten. Each chamber conforms generally to the shape of the food product, with the distance WO93/17532 ~ PCT/US93/01721 between the folds of the accordion pleats determined by the-dimensions of the food pieces. When the food - product has a rectangular cross-section, each pocket encloses two adjacent sides of the food piece. An adjacent folded segment of the susceptor material encloses the remaining two adjacent sides of the same food piece. `~
In a typical application, the invention includes a -~
stack of susceptor segments placed on top of one another with food pieces between them to provide heating surfaces on all major sides of each food piece. The `~
invention can be~embodied in a throw-away carton consisting of an inner sleeve and an outer tray~ The sleeve poxtion contains the heating segments so that `~
after heating, when the sleeve portion of the carton is removed from the tray, the food products can be shaken out into ths tray portion of the package which then functîons as a ser~ing tray. In another application, the stack of susceptor segments are held in alignment by` ;~
a paper band and overwrapped with paper or with a ~ilm ; such as cellophane. The paper strip has a fin seal which acts as a tab that can be used to pick up the ~
susceptor sheets containing the food after heating. In `
. .
a third alternatlve application, the susceptor segments are contained in a~paper or plastic film pouch; after heating, the pouch~is torn open and the food pieces shaken out.
The invention will now be described by way of example with reference to accompany figures which illustrate only a few of the various ways in which the present invention can be practiced within the scope of the appended claims.

THE FIGURES
Figure l is a perspec~ive view partially broken away of a microwave food heating package of the invention;

: ~ :

W093t17532 ~ PCT/US93~01721 ~:

Figure 2 is a cross-sectional view taken on line 2-of Figure l;
Figure 3 îs a perspective view according to another form of the invention;
Figure 4 is a cross-sectional view taken on line 4-4 of Figure 3;
Figure 5 is a perspective view of the carton of Fi~ures 3 and 4, with food pieces being shaken into the tray portion of the carton for serving after heating;
~ igure 6 is a perspective view of a form of the invention in which susceptor segments are held in alignment by a paper band overwrapped in cellophane;
Figure 7 is an enlarged, semi-diagrammatic perspective view showiny one form of susceptor folded to provide continuous, i.e. connected, segments layered one above another in accordance with one form of the in~ention; and Figure 8 is a microscopic cross-sectional view of the susceptor of Figure 4 taken on line 8-8 of Figure 4.

DESCRIPTION OF THE PREFERRED EMBODINENTS
Refer to Figures 1 and 2 which show one form of the invention. Shown in the figures is a package 10 comprising a paper:pouch 12 including broad front and : rear walls 11 and 13 and narrow side walls 15 and 17.
The top is pinched:together at 18a and is closed ~-transYersely by means of an adhesiuely bonded seal 18b.
:
The bottom wall 14 of the pouch 12 is sealed by means of 3~ a bo~tom adhesive seal 14a and the side edges by an upright seal 16. Inside the pouch 12 is a susceptor 42 ~ foxmed from sheet material, e.g., a laminate of paper : and plastic film having numerous parallel longitudinally extending, alternatively oppositely directed ~olds 41, ;~
3~ e.g.~ 90D folds, to define on either side of themselves adjacent pairs of panels 40 that enclose two adjacent :;
surfaces of food pieces 44 such as french fri~d potato ~:

W093/17~3~ PCT/US93/01721 pieces. In his form, th-- lralle~ ~lsceptor sheets ~ , are divided ~y being folc: ;o ~s t be-stacked in parallel horiæontally spa~ ~ apart aligned planes 42a-42d to define food-containing chambers which hJld the 5 potato pieces 44. The food and susceptor are thus -shipped in the pouch 12 which can be formed from any suitable microwave transparent paper or plastic film known to those skilled in the art, such as 30-pound bleached kraft, or from cellophane. Labels (not shown~
are printed on the pouch 12. After heating, the poucr.
is opened by tearing apart the seal l8b. The hot, crispened food pieces 44 can then be shaken out onto a plate.
Figure 2 shows clearly how a single sheet of sus~eptor material 42 is folded three times so as to p:ovide four segments lying in plane 42a-42d to form food-containinq chambers.
;~ ~ It should be noted that in all forms of the invention, the number of folds or pleats 41 per segment, and therefore the number of chambers created by each pair of segments, can be varied. The number of segments can also be varied as needed. In some cases, one segment can be used, but at least two are usually preferred.
In Figures 7 and~ 8 is shown a sl ptor sheet 42 which in this case is a laminate of .~ree separate sheets~bonded together with adhesive and including two sheets of paper 42a, both of which face the food 44.
Between sheets 42a is adhesively bonded a sheet of -flexible plastic 42b such as polyester film that serves as a backing for a microwave interactive coating, eOg., a semiconductive metallic coating 42c, typically ~' ~ aluminum deposited by vacuum metallization thin enoush to transmit about 40% to 60% of incident light. The ~' 35 metal is deposited as a coating upon the plastic base sheet 42b such as a 2 mil polyester film. The metal coating is se~icondutive so that it will interact with WO93tl7532 PCT/US93/01721 the microwave energy in a microwave oven to absorb a -portion of the microwave energy, convert it to heat and in that way brown, toast or crisp the surface of the food pieces 44. Other known microwa~e interactive coatings or substances that will become hot in a microwave oven can be used in place of the metal coating, if desired.
The susceptor 42 can be formed, for example, from sheets of 25-pound greaseproof and 25-pound kraft paper which make up the two outer sheets 42a of the laminate 42. Between them is adhesively bonded a 48-gauge polyestex film 42b metallized with aluminum. The adhesive can be polyvinyl acetate polymer or copoly~èr water-based emulsion-type adhesive, e.g., Electromek adhesive by Electromek Company of Carlstadt, New Jersey, or Duracet adhesive by Franklin Internati~nal, Inc. of Columbus, Ohio.
The laminated susceptor 42 is folded int~ accordion pleats 41, i.e., the folds or pIeats are alternately folded in opposite directions to form adjacent angularly related panels 40, in this case having an angle of 9~o between them. Each fold or pleat 4l creates a V-shaped pocket 40a having flat panels 40 on each side of each ~old 4l. The susceptor 42 is preferably provided in ~-;25 layers made up of either disconnected or connected segments. The term "segments" herein means a piece or portion of a susceptor in a single plane. Four segments ; ~are shown, for example, in the parallel planes designated 42a-42d. ~These segments may be connected together as in Figures l, 2, 7 and 8 or, in the aiternative, the segments can be separate pieces of s~eet material as shown in Figure 6.
Refer now to Figures 3, 4 and 5 which illustrate another embodiment of the invention. Figure 3 shows a 35 food carton 50 comprised of tray 52 and sleeve 51 ~;
portions. The sleeve 51 includes panels 53, 56, 57 and 58 and an end panel 59 having vent openings 59a. The W093/1753~ PCT/US93/01721 g tray 52 includes a broad bottom panel 52 and four short upright side panels 54, 60, 61 and 63. Both the slee~e 51 and the tray 52 of the carton 50 are made of a food grade papexboard and can be assembled using glue and/or locking tabs 54a, 54b and 61b engaged in slots 54c, 61c.
The carton is overwrapped with protective barrier film ~;
49 such as polypropylene or saran coated cellophane and sealed.
In Figure 4, the sleeve portion 51 of the carton 50 lO contains the susceptor 42 which is pro~ided with ;
accordion folds 41 that form V-shaped pockets 40a. The susceptor 42 is configured into four connected segments which are folded over onto one another into layers. The layers are located in four paralleI, vertically spaced lS apart planes 42a-42d such that the side panels 40 intersect these planes at 45~ angles. The bottom fold `
41 of each pocket contacts the top fold 41 of a pocket in the segment layer below it. When the susceptor 42 is configured in this way, it forms parallel, elongated, ; 20 rectangular-shaped chambers having inclined walls. Each chamber is in this way formed from the side walls of an upper and lower ~-shaped~pocket 40a. The food pieces 44 conform generally to t. shape and size of these ;~
chambers.
~ Refer now to Figure 5 which illustrates the carton of Figures 3 and 4~after having been heated and opened.
The hot, crispened food pieces 44 are shown being shaken out of the sleeve portion 51 that retains the susceptor ~ 42 in the tray 52~which~can then function as a serving ;; 30 dish.
Refer now to Figure 6 which illustrates another form ~;
of thé invention. In this case, individual separate ~;
~ .
segments 70 are stacked one above another but are not physically connected. In this way each pair of adjacent - 35 segments 79 form elongated rectangular parallel chambers between themselves in which individual food pieces 44, ::`

WO93/17532 PC~ S93/01721 2~ lo such as french fried potatoes, are located. When heated in a microwa~e oven, the susceptor 42 presents heat to all major surfaces of the food pieces 44, resulting in desirable heating, browning and crisping of the food pieces on all major surfaces. The distance between the accordion folds or pleats 4l depends on ~he size of the food pieces being heated. Disconnected accordion-pleated susceptor segments 70 are stacked in layers to form food-containing heating chambers. A narrow band of paper 71 is wrapped circu~ferentially around the stack of segments 70 to hold them in place and leave both ends of the chambers open. The ends of the paper band 7l are gIued together in a fin seal 72 which provides a lifting tab that can serve as a~handle for picking up hot food when it is to be removed from the oven. The food pieces, susceptor segments and paper band with tab are all contained in a paper or cellophane overwrap 73.
While the invention is suited for a variety of different kinds of food pieces such as french fried ;
potatoes, fish sticks, waffle sticks, bread ~ticks, egg roll~, and the like,~ it is particularly well suited for use with fabricated food products such as cooked and mashed potato mass, i.e., potato dough which is molded to the rectangular; shape shown, cut into pieces of the 2~5 required length, frled in hot shortening, and then placed in the package. Although the forms of the invention descrlbed~herein accommodate food pieces with a rectangular shaped cross-section, embodiments of the invention can~be devised to accommodate food pieces with triangular~, round or oval shaped cross-sec~ions.
Many variations of the present invention within the scope of the appended claims will be apparent to those skilled in the art once the principles described above are understood.

: ',

Claims (31)

WHAT IS CLAIMED IS:
1. A microwave heating package containing a susceptor for heating, browning or crisping food, comprising:
an outer packaging enclosure formed from a material that is at least partially transparent to microwave energy;
at least one susceptor segment comprising a sheet of susceptor material for absorbing microwave energy to heat, brown and crisp the food;
each susceptor segment being folded to have a plurality of parallel, alternately oppositely directed accordion folds so that each successive fold is bent in the opposite direction from the preceding and succeeding folds, thereby forming a plurality of panels adjacent each fold to provide V-shaped pockets on opposite sides of each fold; and a food piece is located in each pocket for being heated and/or crispened by the susceptor during heating in a microwave oven.
2. The microwave heating package of Claim 1 wherein at least one pair of susceptor segments is provided, each pair forms a plurality of chambers between the segments, and the food pieces are located in said chambers between the segments.
3. The microwave heating package of Claim 2 wherein the food pieces are food sticks of rectangular cross-section, the folded susceptor segments are aligned to form polyagonal chambers bounded on opposite sides by the V-shaped pockets, and the rectangular chambers have sidewalls that are inclined with respect to the planes occupies by the susceptor segments.
4. The microwave heating package of Claim 1 wherein the susceptor segments are made of a laminate comprising two paper sheets adhesively bonded to both sides of a base sheet of plastic file coated with a microwave interactive material.
5. The microwave heating package of Claim 2 wherein the susceptor segments are physically connected and are different portions of a single susceptor sheet that is folded between adjacent segments and the folds are boundaries of the segments.
6. A microwave heating package containing a susceptor for heating, browning or crisping food, comprising:
an outer packaging enclosure formed from a material that is at least partially transparent to microwave energy;
at least two susceptor segments, each comprising a laterally extending sheet of susceptor material for absorbing microwave energy to heat, brown and crisp the food;
said susceptor segments are present in pairs wherein each segment is paired with a segment above or below it;
each susceptor segment is folded to have a plurality of parallel, alternately oppositely directed accordion folds so that each successive fold is bent in the opposite direction from the preceding and succeeding folds to form a plurality of adjacent panels to form V-shaped pockets in each segment on opposite sides of each fold;
a food piece is located in each pocket for being heated by the susceptor during heating in a microwave oven;
said susceptor segments are arranged so that one segment of each pair is located on opposite sides of a piece of food, the arrangement being such that the pockets are aligned on opposite sides of the same food piece with a pocket in one segment of the pair enclosing the food piece on two sides and a pocket in the other segment of the pair enclosing the same food piece on its two opposite sides.
7. The microwave heating package of Claim 6 wherein the susceptor segments are physically disconnected such that each segment is a separate susceptor sheet.
8. The microwave heating package of Claim 6 wherein the susceptor segments are enclosed in a carton having an upper sleeve portion containing the susceptor segments and a lower tray portion, and the carton is covered with a flexible overwrap.
9. The carton of Claim 8 wherein after heating in a microwave oven, the sleeve portion can be lifted out of the tray portion and the food pieces shaken out from between the susceptor segments into the tray portion which can be used as a serving container.
10. The microwave heating package of Claim 2 wherein the susceptor segments containing the food pieces are arranged in a stack, the stack is surrounded circumferentially by a paper band that is joined at the ends to form a fin seal that provides a tab which can be used as a handle to lift the food after heating.
11. The microwave heating package of Claim 2 wherein the susceptor segments enclosing the food pieces are contained in a paper pouch that is sealed at its ends.
12. The microwave heating package of Claim 11 wherein the pouch is made of paper or a transparent film.
13. The microwave heating package of Claim 2 wherein the food pieces are formed from a cooked potato mash having the consistency of a formable dough, said dough is formed into strips, fried, and is located in said package between said susceptor segments.
14. The package of Claim 13 wherein the food pieces are fabricated potato pieces composed of cooked, moldable moisture-containing potato mash, said mash if formed into self-supporting dough pieces, said pieces are cut to a selected length and fried in shortening, and the fried pieces are placed in said package between said segments of folded susceptor sheet material.
15. A package for heating individual elongate food pieces, the package including:
a microwave interactive susceptor comprising a tray formed from a continuous sheet of microwave interactive sheet material, a plurality of alternately oppositely directed bends in the continuous sheet of microwave interactive sheet material to provide a zig-zag configuration therein defining adjacent panels formed from the microwave interactive sheet material on either side of each bend and the bends in the susceptor being aligned parallel to one another within the package to divide the package into a plurality of side-by-side food-receiving chambers;
each chamber being sized to hold at least one of the elongate food pieces that is to be heated by the microwave interactive sheet material;
wherein at least two of the adjacent panels of each food-receiving chamber of tray are oriented to face contiguous portions of the same one of said elongate food pieces positioned within the food-receiving chamber for heating said contiguous portions of the elongate food piece, and, wherein when exposed to microwave energy, said microwave interactive sheet material is constructed and arranged to heat, crisp or toast the elongate food pieces.
16. A package as claimed in Claim 15 wherein the sheet material comprises paper or plastic film having a layer of a microwave interactive material applied to at least one surface thereof.
17. A package as claimed in Claim 16 wherein the microwave interactive material comprises a semiconductive metallic coating that has been deposited by metallization.
18. A package as claimed in Claim 15 wherein the sheet material comprises greaseproof paper.
19. A package as claimed in Claim 15 wherein said package includes a plurality of said trays formed from segments of the sheet and said segments are stacked adjacent one another within the package to position the food pieces in layers.
20. A package as claimed in Claim 15 wherein the chambers have open ends that can be selectively exposed so that the received elongate food pieces are able to slide out of the open ends of the chambers under the influence of gravity.
21. A package as claimed in Claim 15 including a dish adapted to selectively receive and hold the food pieces after removal from the chambers.
22. A package as claimed in Claim 15 including a package enclosure comprising a paper or paperboard carton.
23. A package as claimed in Claim 22 wherein the paper or paperboard carton includes a removable portion that is telescopically mounted upon a second carton enclosure portion.
24. A package as claimed in Claim 23 wherein the second carton portion is a sleeve that is open at one end and wherein there is a plurality of said susceptors stacked one above the other within the sleeve portion of the enclosure, each chamber having an open end exposed at the open end of the sleeve to facilitate the removal of the food pieces.
25. A package as claimed in Claim 15 wherein a plurality of said trays are stacked one above the other within the package so that two adjacent trays positioned one above the other within the stack heat upper and lower portions of each food piece.
26. A method of cooking, comprising the steps of:
providing a microwave heating package including:
an outer packaging enclosure formed from a material that is at least partially transparent to microwave energy; and at least one susceptor segment comprising a sheet of susceptor material for absorbing microwave energy to heat, brown or crisp the food;
each susceptor segment being folded to have a plurality of parallel, alternately oppositely directed accordion folds so that each successive fold is bent in the opposite direction from the preceding and succeeding folds, thereby forming a plurality of panels adjacent each fold to provide V-shaped pockets on opposite sides of each fold;

placing a food piece in at least one of the pockets; and exposing the microwave heating package to microwave energy to heat, brown or crisp the food piece.
27. A microwave package comprising:
at least two susceptor segments, each comprising a laterally extending susceptor material for absorbing microwave energy to heat, brown and crisp food;
each susceptor segment being folded to have a plurality of parallel, alternatively oppositely directed accordion folds so that each successive fold is bent in the opposite direction from the preceding and succeeding folds to form a plurality of adjacent panels that produce V-shaped pockets on each side of each susceptor segment;
a plurality of V-shaped pockets of each susceptor segment cooperating to form a plurality of side-by-side chambers for receiving at least one food piece, each chamber formed by one of the plurality of V-shaped pockets from one of the susceptor segments and one of the plurality of V-shaped pockets of a different susceptor segment;
at least two of the adjacent panels of each chamber being oriented to face contiguous portions of the same one of the food pieces positioned within the chamber;
the chambers for the food pieces being tipped on an edge with respect to a plane of a row in which the chambers are aligned.
28. The microwave package of Claim 27, further comprising at least three susceptor segments configured to define parallel rows of chambers, wherein the chambers in a first row of chambers is staggered relative to the chambers of a second row of chambers.
29. The microwave package of Claim 28, wherein the susceptor segments comprise a continuous susceptor sheet.
30. The microwave package of Claim 27, wherein the susceptor segments comprise a continuous susceptor sheet.
31. A microwave heating package comprising:
a susceptor segment comprising a laterally extending susceptor material for absorbing microwave energy to heat, brown and crisp;
the susceptor segment being folded to be a plurality of alternately oppositely directed parallel bends to provide a zigzag configuration defining adjacent panels on either side of each bend, the bends and adjacent panels defining a plurality of V-shaped pockets for receiving at least one food piece;
the two adjacent panels of each V-shaped pocket being oriented to face contiguous portions of the same one of the food pieces positioned within the V-shaped pocket;
each V-shaped pocket being positioned on an edge defined by the bend of each V-shaped pocket between the adjacent panels.
CA002130823A 1992-02-28 1993-02-25 Microwave food heating package with accordion pleats Abandoned CA2130823A1 (en)

Applications Claiming Priority (2)

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US843,524 1992-02-28
US07/843,524 US5334820A (en) 1992-02-28 1992-02-28 Microwave food heating package with accordion pleats

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CA2130823A1 true CA2130823A1 (en) 1993-09-02

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EP (1) EP0627156B1 (en)
JP (1) JP3345421B2 (en)
AT (1) ATE231320T1 (en)
AU (1) AU3734293A (en)
BR (1) BR9305979A (en)
CA (1) CA2130823A1 (en)
DE (1) DE69332638T2 (en)
ES (1) ES2191010T3 (en)
PT (1) PT627156E (en)
WO (1) WO1993017532A1 (en)

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Publication number Publication date
EP0627156A1 (en) 1994-12-07
ATE231320T1 (en) 2003-02-15
DE69332638D1 (en) 2003-02-20
EP0627156B1 (en) 2003-01-15
JP3345421B2 (en) 2002-11-18
WO1993017532A1 (en) 1993-09-02
US5334820A (en) 1994-08-02
ES2191010T3 (en) 2003-09-01
JPH07504383A (en) 1995-05-18
BR9305979A (en) 1997-11-18
EP0627156A4 (en) 1996-09-04
DE69332638T2 (en) 2003-10-30
PT627156E (en) 2003-06-30
AU3734293A (en) 1993-09-13

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