EP1245504A1 - Sachet a double paroi pour cuire des aliments à la vapeur - Google Patents

Sachet a double paroi pour cuire des aliments à la vapeur Download PDF

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Publication number
EP1245504A1
EP1245504A1 EP01107683A EP01107683A EP1245504A1 EP 1245504 A1 EP1245504 A1 EP 1245504A1 EP 01107683 A EP01107683 A EP 01107683A EP 01107683 A EP01107683 A EP 01107683A EP 1245504 A1 EP1245504 A1 EP 1245504A1
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EP
European Patent Office
Prior art keywords
bag
double
microwaveable
outer bag
food product
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.)
Withdrawn
Application number
EP01107683A
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German (de)
English (en)
Inventor
designation of the inventor has not yet been filed The
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.)
Cryovac LLC
Original Assignee
Cryovac LLC
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 Cryovac LLC filed Critical Cryovac LLC
Priority to EP01107683A priority Critical patent/EP1245504A1/fr
Priority to PCT/US2002/009435 priority patent/WO2002080623A1/fr
Publication of EP1245504A1 publication Critical patent/EP1245504A1/fr
Withdrawn legal-status Critical Current

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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
    • B65D81/3461—Flexible containers, e.g. bags, pouches, envelopes
    • 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
    • B65D2581/3401—Cooking or heating method specially adapted to the contents of the package
    • B65D2581/3429—Packages containing a secondary product to be cooked and discharged over the primary product
    • B65D2581/3433—Packages containing a secondary product to be cooked and discharged over the primary product to add moisture to the product, e.g. steaming

Definitions

  • the present invention relates to an improved storage and cook-in flexible container for use in the packaging of food products that require moisturized conditions for their proper storage and/or thawing and/or cooking and/or re-heating.
  • EP-A-1,053,944 describes a package for the storage and cook-in or re-heat of a food product, said package comprising a tray with a perforated false bottom upon which it is placed the food product, a moisturized pad positioned between the bottom and the false bottom of the tray and a thermoplastic film covering the product and closing the package.
  • the product is thus stored under moisturized but not wet conditions and is then cooked, directly into the package, by placing the package into a microwave oven.
  • the above system however has several disadvantages as the use of rigid receptacles such as trays, and particularly double bottom trays, requires a huge amount of space in the packaging facility merely for storing the packaging materials; the cost of such a package is high mainly because of the cost of the double bottom trays that are required; and finally the weight and volume of plastic material to be disposed of by the end consumer after usage is very high.
  • the solution offered by the present invention is a microwaveable double bag of thermoplastic flexible material having at least an inner perforated bag, an outer bag and an absorbing pad, fastened to the inner surface of the outer bag.
  • the pad In use, just before loading the product in the inner bag of the double bag package, the pad is suitably moisturized with the required amount of water, aromatized water or any other suitable liquid capable of generating steam, the food product is then loaded into the inner perforated bag, and the double bag is closed, with the inner bag inside the outer one.
  • the sequence of the above steps can also be slightly altered in that the pad can be moisturized while loading the food product into the inner bag or soon after having loaded it but before closing the double bag.
  • the package thus obtained can then be stored (if the food product is a frozen product under frozen conditions), while dehydration of the packaged product is controlled, and can be passed into the microwave oven when thawing, and/or reheating and/or cooking of the packaged product is desired.
  • a second object is a food package comprising a food product, and a microwaveable double bag with an inner perforated bag of thermoplastic flexible material containing said food product and an outer bag of thermoplastic flexible material with a pad moisturized with a steam-generating liquid fastened to its inner surface, said outer bag containing the inner bag with the food product.
  • a third object is a method of packaging a food product in a flexible container suitable for storage and microwave treatment of the food product (including in this term any thawing and/or cooking and/or re-heating), said method comprising loading the food product into the inner perforated bag of a microwaveable double bag comprising in addition to the inner perforated bag of thermoplastic flexible material also an outer bag of thermoplastic flexible material with a moisturized pad fastened to its inner surface, optionally modifying the atmosphere within the package to increase the shelf-life of the product to be packaged and closing the double bag.
  • double bag includes the case where the two bags are separated and are just inserted one within the other to make a double bag, as well as the case where the two bags are permanently fastened one to the other. In this latter case, this can be achieved e.g. by attaching one or both the top edges of the inner perforated bag to the inner walls of the outer bag or by joining the two bags along a line parallel to one or both the top edges of the two bags, either by continuous or discontinuous seams.
  • microwaveable when referred to the package according to the present invention means that under the conditions required for thawing, cooking or re-heating the packaged product into a microwave oven, the packaging material is substantially not deformed (by melting or softening and re-shaping upon cooling) and does not release more than 60 ppm of global contaminants to the packaged food in contact therewith.
  • packaging materials that withstand a heat treatment at 121 °C for 1 ⁇ 2 hour (conditions that are drastic enough not to be reached normally in microwave cooking) without deforming and without releasing more than 60 ppm of contaminants, are considered to be "microwaveable" according to most of the food laws.
  • thermoplastic materials suitable for the manufacture of the flexible package of the invention include polyolefins (such as propylene-based polymers or preferably crosslinked polyethylene-based polymers), polyesters, nylons and any other thermoplastic material that under the conditions of use will not be altered by the microwaves.
  • the thickness of the thermoplastic films used for the inner and the outer bag is not particularly critical and will be selected mainly on the basis of the size of the bag and of the weight of the product to be packaged. Films up to 60 ⁇ m are typically employed even if thicker films may as well be suitably used. Preferred films will have a thickness comprised between about 10 and about 45 ⁇ m, and more preferred films will have a thickness comprised between about 14 and about 35 ⁇ m.
  • any pad currently known and used for absorbing fluids from the packaged food products can be employed in the double bag of the present invention provided it is suitable for microwave applications.
  • Pads for use in microwave processes are known in the literature and are now commercially available. As an example pads for microwave applications are described e.g. in US-A-5,552,169.
  • the pad may be covered by a plastic film. This however is only preferable and not necessary as the contact between the packaged product and the liquid in the pad can be prevented in several other ways.
  • the inner bag is perforated to allow the steam generated during the cooking step to reach the product.
  • the inner bag may be uniformly perforated or only partially perforated. "Uniformly perforated” means that the perforations are substantially evenly spaced apart from each other over the entire surface area of the inner bag.
  • this can be achieved by perforating only part of the inner bag containing the food product, e.g. only one panel thereof, and the double bag is then manufactured in such a way that the imperforated part, e.g. the imperforated panel, of the inner bag will overlay the pad.
  • this can be achieved by using a uniformly perforated inner bag but keeping the food product separated from the wet pad by e.g.
  • the number and size of the perforations in the inner bag should be sufficient to allow the steam to reach the product and uniformly cook it. While it would be sufficient to have a single hole to allow the steam to reach the product in the inner bag, it is generally preferred to have at least 1 perforation per 10 cm 2 , typically at least 3 perforations per 10 cm 2 , more preferably at least 5 perforations per 10 cm 2 , and even more preferably at least 1 perforation per cm 2 .
  • the average diameter of said perforations is typically from about 100 to about 1,000 ⁇ m, as this is the average size of the holes that are made in-line, by mechanical punching or electrical burning through, in the manufacture of perforated films. Larger holes or smaller holes (e.g. made by laser perforators) could however be foreseen. The number of holes per cm 2 could then be increased (for smaller holes) or reduced (for the larger ones). Or it can be foreseen an inner bag with a combination of holes of different size.
  • the outer bag is of essentially imperforated, moisture proof, material.
  • the outer bag may optionally contain a single or a limited number of holes used as vent hole(s) during the cooking or re-heating step.
  • the outer bag contains only one vent hole that is covered by a label (with gas barrier properties if a modified atmosphere package is envisaged) that is removed just before placing the package in the microwave oven for cooking or re-heating the product.
  • the outer bag does not contain vent holes but has a weak seal or part of it, which opens up when the overpressure within the package reaches a certain threshold value.
  • the outer bag is imperforated but is of a size suitable to contain the steam generated during the cooking step without bursting. More sophisticated systems, involving the use of valves, can also be foreseen even if such systems may bring about an increase in the cost of the package and are therefore not preferred.
  • the outer bag may be printed with e.g. information relating to the content of the bag and the conditions of storage, and thawing, cooking or re-heating. If the double bag contains at least a vent hole and a label covering it, said information can alternatively be printed on the label that hides the vent hole.
  • the films for the inner and outer bags are preferably transparent, as the customer should be allowed to look into the package. It is however possible in line of principle to use colored films or opaque films, in particular for those parts of the bags where the presence of the pad will not allow anyway to see through the packaging material.
  • the pad is fastened to the inner surface of the outer bag by any suitable means. It can be adhered by a hot melt spot or it may be heat-sealed thereto or it can be secured by one or more strips of thermoplastic film that extend across the pad and are fastened to the outer bag inner surface by e.g. heat-sealing, thus keeping the pad in place.
  • pads are typically rectangular in shape, pads of any shape could be suitably employed in the manufacture of the double bag of the present invention. While in line of principle they may have the same size as the flattened outer bag, it is preferred in practice to keep their size up to 2/3 the surface of the flattened outer bag and preferably up to 1/2 of said surface.
  • the size and thickness of the pad will be suitably selected also depending on the amount of liquid that needs to be released by the pad during thawing, cooking or re-heating and therefore on the amount of liquid that needs to be absorbed by the pad at the packaging step.
  • the film used for the inner perforated bag is preferably a solid-state oriented and heat-shrinkable film. This is achieved by obtaining first a thick sheet (so-called primary tape) by conventional extrusion, co-extrusion, or extrusion-coating techniques; quickly cooling said tape to slow down crystallization of the resins; re-heating said tape to a temperature that is higher than the Tg of all the resins making up the tape and lower than the melting temperature of at least one of said resins (the so-called orientation temperature); and stretching the heated tape in either one or both longitudinal and transverse directions, to obtain an oriented film that tends to shrink back to the unoriented state when heated to a temperature close to the orientation temperature.
  • primary tape a thick sheet
  • orientation temperature the so-called orientation temperature
  • the heat generated during cooking will thus shrink the film of the inner bag. This may be useful to keep the packaged product in place and maintain its original shape also during the cooking step. It is also possible, using a heat-shrinkable film for the inner bag, to shrink it just after the packaging step. This will allow keeping the packaged product in place also during storage.
  • heat-shrinkable film for the inner bag however is only preferred but not necessary and any type of packaging film, whether oriented or non-oriented, shrinkable or non-shrinkable, can be employed for the inner bag.
  • the outer bag should not shrink under the conditions of cooking, as the rapid increase in pressure within the package by the steam generation would be further increased if the volume of the outer bag decreases by a shrinking effect.
  • the outer bag is preferably made of a non-oriented thermoplastic film or of an oriented and heat-set thermoplastic film or of an oriented thermoplastic film that has however only a minimum shrink at the temperature reached in the cooking step.
  • the two bags when fastened one to the other in a stable manner can be attached continuously and uniformly along a line that can be a line parallel to the bag mouth of both bags or that may be a line parallel to the mouth of the outer bag and corresponding to the mouth of the inner bag.
  • these two bags can be attached also in a discontinuous or intermittent manner along said line.
  • Any means suitable to attach the two bags together and that can withstand a microwave treatment can be employed, such as any type of sealing, e.g. hot wire or heated bar sealing, ultrasounds sealing, RF sealing (if the resins used for the bags are RF sealable), and the like, the use of hot melt or pressure sensitive adhesives that can withstand a microwave treatment, etc.
  • the two bags can be made separately, one outer bag with the pad fastened to its inner surface, and an inner perforated bag. In such a case preferably, but not necessarily, at least one of the dimensions of the inner bag is smaller than the corresponding dimension of the outer bag.
  • These two separated bags are then combined by introducing the inner bag into the outer one. This can be done either before or after the pad is moisturized and either before or after the product to be packaged is loaded into the perforated inner bag.
  • the last step in the packaging process is that the mouth of the double bag is closed.
  • the mouths of the two bags may be closed either separately or, preferably, they are closed altogether by any suitable means, typically by flattening them and heat sealing with a sealing bar, or by gather sealing or by clipping with a microwaveable clip. It is also possible to use reusable closure means, with mateable male and female closure means.
  • the double bag of the present invention can be made starting from two continuous flat webs, one of the perforated film for the inner bag and the other one of the substantially imperforated film for the outer bag with attached, at a certain distance determined by the width of the end double bag, an absorbing pad.
  • the two flat webs are superimposed with the pad in-between, they are joined at least along one longitudinal edge or along a line parallel to one longitudinal edge, by a continuous or discontinuous seam, folded longitudinally and converted into double bags by transversely seal cutting the folded webs.
  • the double bag of the present invention can be manufactured starting from two center-folded films, an inner perforated film for the inner bag and an outer substantially imperforated film, bearing the pad attached to its inner surface, for the outer bag.
  • the two films can then be fastened together along both longitudinal edges or along lines parallel and close to both longitudinal edges and converted into bags by a series of transverse seal cuts.
  • This process it is possible to fasten the pad in the fold on the bottom of the film used for the outer bag and employ for the inner bag a center-folded film with a width smaller than that of the film for the outer bag so that in the end double bag the inner one will be shorter than the outer one and any contact between the product to be loaded in the inner bag and the liquid in the pad positioned in the bottom of the outer bag will be prevented.
  • At least one discontinuity in the fastening of the two webs or bags is present in order to leave a passage for the liquid that should moisturize the pad before use. If such a discontinuity is not present, the perforations in the inner bag are preferably large enough to allow the smooth flow of the moisturizing liquid through them before loading the product.
  • the size of the double bag according to the present invention is not critical as the same principle can apply to small consumer units, such as packages for e.g. 100 to 500 g of food product or even less, to medium size consumer units, such as packages for e.g. 500 to 2,000 g of food product, to so-called bulk consumer units, the type of packages that are suitable for the catering/food service industry, such as packages for e.g. 2,000 to 5,000 g of food product or even more.
  • a cardboard label may be stuck to the outermost surface of the double bag and be used to grasp the bag with the fingers at the end of the cooking step, the cardboard acting as an insulating material.
  • the microwaveable double bag of the present invention can be employed for the storage and thawing, cooking or re-heating of a variety of products such as fresh food products, e.g. vegetables, fruits, fish, and the like, a variety of cooked food products such as for instance processed meat, e.g. sausages, and a variety of frozen foods, including ready meals or frozen raw products.
  • a variety of products such as fresh food products, e.g. vegetables, fruits, fish, and the like
  • a variety of cooked food products such as for instance processed meat, e.g. sausages
  • frozen foods including ready meals or frozen raw products.
  • the amount of steam-generating liquid to be absorbed by the pad in the packaging process and the type of liquid to be used can be easily optimized by the person skilled in the art in view of the specific type and weight of product to be packaged.
  • Fig. 2 shows the same embodiment in a perspective front view where the same numerals as in Fig. 1 are used to identify the same parts.
  • the outer bag front panel 11 and the rear panel 13 are united at side edges 16 and 17 either by a fold in the film or typically by a seam.
  • the inner bag front panel 21 and rear panel 23 are united at side edges 26 and 27 to create a bag.
  • the inner bag 20 bears perforations 28.
  • 18 indicates the optional vent hole in the outer bag and 19 is the removable label that close the vent hole until the package is put into a microwave oven.
  • 30 is the pad that is drawn in dotted lines to indicate that it is attached to the inner surface of the outer bag.
  • Fig. 2a refers to the same embodiment wherein however once the product has been loaded and the pad moisturized, the mouth of the double bag is closed by welding altogether the four film webs, i.e. the front panel of the outer bag 11, the front panel of the inner bag 21, the rear panel of the inner bag 22, and the rear panel of the outer bag 12, by heat-sealing.
  • the mouth of both bags can be gathered and either sealed or clipped using a microwaveable clip.
  • An advantage of this embodiment resides in the possibility of closing the double bag by heat-sealing together only the two panels 11 and 12 of the outer bag 10, e.g. by heat-sealing the flattened bag with a sealing bar, along a line positioned between the edges 13 and 14 of the outer bag 10 and the welding lines a and b.
  • FIGs. 5 and 6 a cross-section view and a perspective front view respectively of a third embodiment 3 of the double bag of the invention, where the inner and the outer bags are fastened together by a continuous a or a discontinuous b seam, along a line parallel to the edges of both bags and close thereto.
  • Fig. 7 shows another embodiment where the inner bag is eccentrically inserted into the outer bag and the two bags are fastened together only in few points with a discontinuous seam. This may be achieved by spots of a microwaveable hot melt adhesive or by heat-sealing.
  • FIG. 8 A process for making industrially the double bag according to the present invention where the two bags are fastened is shown in Fig. 8.
  • the process there schematically described comprises the following steps

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Food Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Package Specialized In Special Use (AREA)
EP01107683A 2001-03-28 2001-03-28 Sachet a double paroi pour cuire des aliments à la vapeur Withdrawn EP1245504A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP01107683A EP1245504A1 (fr) 2001-03-28 2001-03-28 Sachet a double paroi pour cuire des aliments à la vapeur
PCT/US2002/009435 WO2002080623A1 (fr) 2001-03-28 2002-03-28 Sachet fonctionnel de cuisson et de conservation d'aliments

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01107683A EP1245504A1 (fr) 2001-03-28 2001-03-28 Sachet a double paroi pour cuire des aliments à la vapeur

Publications (1)

Publication Number Publication Date
EP1245504A1 true EP1245504A1 (fr) 2002-10-02

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EP01107683A Withdrawn EP1245504A1 (fr) 2001-03-28 2001-03-28 Sachet a double paroi pour cuire des aliments à la vapeur

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EP (1) EP1245504A1 (fr)
WO (1) WO2002080623A1 (fr)

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EP1790579A1 (fr) * 2005-11-29 2007-05-30 Unilever Plc Sac en plastique avec bordure de tête
USD610903S1 (en) 2007-03-02 2010-03-02 Conagra Foods Rdm, Inc. Container assembly
USD635816S1 (en) 2006-06-09 2011-04-12 Conagra Foods Rdm, Inc. Container basket
EP2308757A1 (fr) * 2009-10-07 2011-04-13 Südpack Verpackungen GmbH & Co. KG Procédé de fabrication d'emballages et emballages destinés à la conservation d'aliments
USD638701S1 (en) 2010-09-08 2011-05-31 Conagra Foods Rdm, Inc. Container
USD639186S1 (en) 2010-09-08 2011-06-07 Conagra Foods Rdm, Inc. Container with sleeve
USD639656S1 (en) 2010-09-08 2011-06-14 Con Agra Foods RDM, Inc. Container lid
US8302528B2 (en) 2005-10-20 2012-11-06 Conagra Foods Rdm, Inc. Cooking method and apparatus
EP2540634A1 (fr) * 2011-06-29 2013-01-02 Dampack International BV Conteneur d'emballage alimentaire
USD680426S1 (en) 2012-06-12 2013-04-23 Conagra Foods Rdm, Inc. Container
US8613249B2 (en) 2007-08-03 2013-12-24 Conagra Foods Rdm, Inc. Cooking apparatus and food product
US8850964B2 (en) 2005-10-20 2014-10-07 Conagra Foods Rdm, Inc. Cooking method and apparatus
USD717162S1 (en) 2012-06-12 2014-11-11 Conagra Foods Rdm, Inc. Container
US8887918B2 (en) 2005-11-21 2014-11-18 Conagra Foods Rdm, Inc. Food tray
US9027825B2 (en) 2012-06-12 2015-05-12 Conagra Foods Rdm, Inc. Container assembly and foldable container system
US9132951B2 (en) 2005-11-23 2015-09-15 Conagra Foods Rdm, Inc. Food tray
US9211030B2 (en) 2005-10-20 2015-12-15 Conagra Foods Rdm, Inc. Steam cooking apparatus
CN105377705A (zh) * 2013-07-08 2016-03-02 市场发展股份公司 用于储存、保存以及浸泡和/或软化食品的装置
US9676539B2 (en) 2013-05-24 2017-06-13 Graphic Packaging International, Inc. Package for combined steam and microwave heating of food
AT519789A1 (de) * 2017-04-05 2018-10-15 Essletzbichler Peter Verpackung für Lebensmittel und Befüllvorrichtung für eine solche Verpackung

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US8541038B2 (en) 2008-11-18 2013-09-24 Kraft Foods Group Brands Llc Food package for segregating ingredients of a multi-component food product
US8409645B2 (en) 2008-11-18 2013-04-02 Kraft Foods Group Brands Llc Food package for segregating ingredients of a multi-component food product
US8551545B2 (en) 2008-11-18 2013-10-08 Kraft Foods Group Brands Llc Food package for segregating ingredients of a multi-component food product
GB2478282B (en) 2010-03-01 2012-02-29 Planit Products Ltd Self adhesive bags for steam cooking in a microwave oven
TW201538395A (zh) * 2014-04-09 2015-10-16 Ming-Han Wu 資料袋之製法及其結構

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Cited By (31)

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US10569949B2 (en) 2005-10-20 2020-02-25 Conagra Foods Rdm, Inc. Cooking method and apparatus
US8850964B2 (en) 2005-10-20 2014-10-07 Conagra Foods Rdm, Inc. Cooking method and apparatus
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