EP0728678B1 - Mikrowellenfeste Lebensmittelverpackung sowie Verfahren zur Herstellen derselben - Google Patents

Mikrowellenfeste Lebensmittelverpackung sowie Verfahren zur Herstellen derselben Download PDF

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Publication number
EP0728678B1
EP0728678B1 EP19960300423 EP96300423A EP0728678B1 EP 0728678 B1 EP0728678 B1 EP 0728678B1 EP 19960300423 EP19960300423 EP 19960300423 EP 96300423 A EP96300423 A EP 96300423A EP 0728678 B1 EP0728678 B1 EP 0728678B1
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EP
European Patent Office
Prior art keywords
sheet
deoxidizer
absorbing agent
package
oxygen absorbing
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EP19960300423
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English (en)
French (fr)
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EP0728678A3 (de
EP0728678A2 (de
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Hideyuki c/o Mitsubishi Gas Chem. Comp Takahashi
Masaki c/o Mitsubishi Gas Chem. Comp. Nagata
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Mitsubishi Gas Chemical Co Inc
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Mitsubishi Gas Chemical Co Inc
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    • 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
    • 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
    • B65D81/24—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants
    • B65D81/26—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants with provision for draining away, or absorbing, or removing by ventilation, fluids, e.g. exuded by contents; Applications of corrosion inhibitors or desiccators
    • B65D81/266—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants with provision for draining away, or absorbing, or removing by ventilation, fluids, e.g. exuded by contents; Applications of corrosion inhibitors or desiccators for absorbing gases, e.g. oxygen absorbers or desiccants
    • B65D81/267—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants with provision for draining away, or absorbing, or removing by ventilation, fluids, e.g. exuded by contents; Applications of corrosion inhibitors or desiccators for absorbing gases, e.g. oxygen absorbers or desiccants the absorber being in sheet form
    • 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
    • B65D81/24—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants
    • B65D81/26—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants with provision for draining away, or absorbing, or removing by ventilation, fluids, e.g. exuded by contents; Applications of corrosion inhibitors or desiccators
    • B65D81/266—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants with provision for draining away, or absorbing, or removing by ventilation, fluids, e.g. exuded by contents; Applications of corrosion inhibitors or desiccators for absorbing gases, e.g. oxygen absorbers or desiccants
    • B65D81/268—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants with provision for draining away, or absorbing, or removing by ventilation, fluids, e.g. exuded by contents; Applications of corrosion inhibitors or desiccators for absorbing gases, e.g. oxygen absorbers or desiccants the absorber being enclosed in a small pack, e.g. bag, included in the package

Definitions

  • the present invention relates to a microwaveable food package, and to a manufacturing method thereof. More particularly, placing a sheet-form deoxidizer together with the packaged product inside a package yields excellent quality retention and allows cooking to be performed in a microwave oven with the sheet-form deoxidizer remaining in the package.
  • the microwaveable food package pertaining to the present invention can be used in applications aimed at retaining the quality of sterilized cooked rice and other processed grain foods; fried foods; steamed foods; various side dishes; hors d'oeuvres; Japanese and Western confections; various types of noodles; baked potatoes; pouch-packed foods and other semi- or precooked foods; and various other microwaveable foods.
  • a preservation technique involving the use of a deoxidizer is aimed at preventing the oxidation of food fats, preventing discoloration, preserving the taste, preventing insect damage, and preventing the growth of aerobic bacteria by placing a deoxidizer together with the contained product into the food packaging container and sucking out the oxygen inside the container to create an anaerobic state, affording satisfactory retention of the quality of food products.
  • a microwaveable food product used together with a deoxidizer be directly placed in a microwave oven without having each time to remove the deoxidizer from the packaging container containing the food product.
  • a commonly used deoxidizer is obtained by placing a particulate deoxidizer composition based on an iron powder into a breathable pouch of packaging material.
  • irradiating such a conventional pouched deoxidizer with microwaves results in most of the microwaves passing through the packaging material and being absorbed by the deoxidizer composition based on an iron powder.
  • eddy currents form in the deoxidizer composition, and heat rapidly evolves.
  • the resulting disadvantage is that the packaging material is burned or the water contained in the deoxidizer composition is rapidly vaporized, causing expansion and pouch rupture. As a result, the deoxidizer spills from the pouch and the packaged material is contaminated.
  • Other problems that have been identified in the past with respect to pouched deoxidizers include obstacles encountered during the filling of the food package and the sensation of a presence of a foreign object.
  • Japanese Laid-Open Patent Application 2-413 describes a deoxidizer composition for use in microwave ovens that is obtained by mixing an iron powder and a special filler to prevent eddy currents from being generated in the iron powder by diluting the iron powder with the filler.
  • the deoxidizer described in this publication possesses improved microwave resistance but is still disadvantageous in that the contents of the powdery deoxidizer are difficult to handle and that contamination, dusting, and the like readily occur during filling and packaging.
  • Another disadvantage is that the deoxidizer hardens when stored for a long time, losing its microwave resistance.
  • EP 0 481 730 A describes a microwaveable food package, obtained by sealing a food product in an airtight container together with an oxygen absorbing packet comprising an iron-based deoxidizer composition packaged in an air-permeable packaging material and a microwave-proof layer; and a method for manufacturing such a package by packaging an iron-based deoxidizer composition in an an air-permeable packaging material and a microwave-proof layer and placing a food product and the oxygen absorbing packet into a container and then sealing the container to form an airtight container.
  • the document does not describe a sheet-form oxygen absorbing agent prepared by kneading an iron-based deoxidizer composition with a thermoplastic resin.
  • EP 0 367 390 A describes a deoxidizer film having a film body made of a thermoplastic resin in which a deoxidizer composition is dispersed.
  • Microwaveable food packages manufactured using conventional deoxidizers are thus not necessarily satisfactory, and many improvements are still needed.
  • the present invention provides a completely novel microwaveable food package which of course retains the quality of the contained product in an excellent manner, which does not change its properties when placed directly in a microwave oven and irradiated with microwaves, which is highly safe and hygienic, which is easy to manufacture, and which does not create the sensation of a presence of a foreign object when packaged.
  • the microwaveable food package of the present invention comprises a microwaveable food package, obtained by sealing a food product inside an airtight container together with a sheet-form oxygen absorbing agent obtained by packaging in a breathable packaging material a product prepared by kneading an iron-based deoxidizer composition with a thermoplastic resin, and forming a sheet.
  • a microwaveable food package comprising the steps of:
  • a microwaveable food package comprising the steps of:
  • a deoxidizing sheet The product obtained by kneading an iron-based deoxidizer composition with a thermoplastic resin and forming a sheet is referred to herein as "a deoxidizing sheet,” and the product obtained by coating at least a portion of the deoxidising sheet or the entire deoxidizing sheet with a breathable packaging material "a sheet-form deoxidizer.”
  • the deoxidizing sheet and the sheet-form deoxidizer will hereinafter be collectively referred to as "sheet-form deoxidizers”.
  • a deoxidizing sheet obtained by kneading an iron-based deoxidizer with a thermoplastic resin, dispersing the ingredients, forming the dispersion into a sheet, and drawing the sheet possesses excellent microwave resistance and oxygen absorption characteristics, and is thus suitable as the sheet-form deoxidizer for the present invention.
  • the deoxidizer based on an iron powder that is used for the deoxidizing sheet contains the iron powder as its principal component, also contains metal halide salts, and may optionally contain added activated carbon, fillers poorly soluble in water, and other components.
  • this deoxidizer based on an iron powder can be a simple mixture of the aforementioned components, it is preferable for a metal halide salt to be applied to or to be dispersed and deposited on the surface of an iron powder, a mixture of an iron powder and activated carbon, or the like.
  • a reduced iron powder, electrolytic iron powder, atomized iron powder, or the like can be used as the aforementioned iron powder.
  • a powder of small particle size is preferred.
  • a powder with a particle diameter of 100 ⁇ m or less is commonly used, and a powder with a particle diameter of 50 ⁇ m or less is preferably used.
  • metal halides include sodium chloride, potassium chloride, barium chloride, calcium chloride, and magnesium chloride.
  • a low-density polyethylene, high-density polyethylene, polypropylene, ethylene- ⁇ -olefin copolymer, polymethyl pentene, or other olefin-based resin can be used as the thermoplastic resin in which the deoxidizer based on an iron powder is dispersed.
  • a deoxidizing sheet can be easily manufactured by the method described in Japanese Laid-Open Patent Application 2-72851, for example. Specifically, with such a deoxidizing sheet, a deoxidizer based on an iron powder is kneaded with the aforementioned thermoplastic resin in a ratio of 30 to 85 wt% scavenger to between 15 and 85 wt% resin, the kneaded product is melted and formed into a sheet, and the sheet is drawn. It is preferable for the resulting draft ratio to be 1.5 to 10.
  • the optimum thickness value of the deoxidizing sheet can be suitably selected with consideration for the oxygen absorption characteristics, workability, filling properties, and the like, with a range of 0.2 to 3 mm being preferred.
  • the deoxidizing sheet is used as a sheet-form deoxidizer coated completely or at least partially with a breathable packaging material.
  • a type in which the deoxidizing sheet is packaged using a breathable packaging material and a type in which the sheet-form deoxidizer and a breathable packaging material are laminated and coated.
  • Specific examples of such sheet-form deoxidizers are not limited by these examples, however.
  • a water-resistant nonwoven fabric for example, "TYVEK” (trade name) manufactured by Du Pont, or "Luxer” (trade name) manufactured by Asahi Chemical Industry Co., Ltd.
  • label types This is a label type that is obtained by laminating a base layer having an adhesive layer, an deoxidizing sheet, and a breathable layer in the sequence indicated, and directly bonding the breathable layer to the base layer along the perimeter.
  • An alternative label type is one made integral with an indicator label obtained by laminating a breathable tackifying layer, a breathable packaging material layer, a deoxidizing sheet, an adhesive layer, and an indicator label in the order indicated. (Sheets provided in advance with adhesive layers in such a manner will hereinafter be referred to as "label types. ”)
  • NITFLON (trade name) manufactured by Nitto Denko Corp.
  • a breathable packaging material obtained by laminating a perforated film onto such a water-resistant nonwoven fabric or microporous film, or any of the above after they have undergone a water-resistance and oil-resistance treatment.
  • a breathable packaging material produced by laminating a perforated film onto paper for example, TYVEK” or “Luxer”
  • any of a variety of breathable packaging materials composed of various microporous films for example, “Celgard”, “Nf Sheet”, and “NITFLON”
  • the packaging material for sheet-form deoxidizers be resistant to solutions. It is also preferable to use, in addition to the aforementioned nonwoven fabrics and microporous films, products obtained by laminating perforated polyethylene terephthalate, polyamide, EVAL, aluminum foil, and other heat-resistant films onto water-and oil-resistant breathable packaging materials in order to prevent the iron powders from eluting.
  • Examples include packaging materials obtained by laminating perforated films having a double-layer structure consisting of a polyethylene terephthalate layer and a polyethylene layer or perforated films having a double-layer structure consisting of a nylon layer and a polyethylene layer, on the one hand, and water-resistant nonwoven fabrics, microporous films, water- and oil-resistant packaging materials, or the like, on the other hand, as well as packaging materials having a three-layer structure obtained by laminating a porous polyolefin resin film based onto one side.
  • the sheet-form deoxidizer used in the present invention is commonly a moisture-dependent type that absorbs oxygen using moisture evaporated by the food product.
  • a sheet and a water-absorbing resin that retains moisture can be used together as a self-initiating reaction type.
  • Deodorant sheets such as paper that supports activated carbon or the like
  • water-absorbing resins water-absorbing sheets, carbon dioxide-absorbing sheets, and the like can also be appropriately used in accordance with the object.
  • the sheet-form deoxidizer is sealed together with a food product in an airtight container, yielding a food package.
  • the sheet-form deoxidizer can be fixed in accordance with the object, but simple sealing is occasionally employed.
  • Adhesives, hot cement, double-sided tapes, and the like can be used to fix the sheet-form deoxidizer, and the aforementioned types of sheet-form deoxidizer are adequately selected depending on the fixing method.
  • a container which is at least resistant to oxygen transmission and which can be cooked by transmitting microwaves in a microwave oven is used as the airtight container for storing food products.
  • the airtight container may be in the form of a pouch or a container. It is preferable for the airtight container to have permeation resistance characteristics that correspond to an oxygen permeability of 100 mL/m 2 ⁇ 24 Hr ⁇ atm or less.
  • Packaging pouches or containers that exhibit a variety of oxygen-permeation resistance levels and that are used for the preservation and packaging of deoxidizers for food products can commonly be employed as such airtight containers.
  • Pouches made of airtight plastic films can be cited as examples of such airtight pouches.
  • Specific examples include pouches made of polyethylene terephthalate, polyamides, polyvinylidene chloride, ethylene-vinyl alcohol copolymers, polyvinyl alcohol, polyvinylidene chloride coat films, aluminum vapor deposited films, aluminum foil, silica vapor deposited films, and other films; composite films ("Triplenylon” (trade name) manufactured by Ozaki Fine Chemical Co. Ltd., and "BARRIALON” (trade name) manufactured by Asahi Chemical Industry Co.
  • Products obtained by sealing the tops of containers made of polypropylene, ethylene-vinyl alcohol copolymers, polypropylene, and the like with the aforementioned airtight films can also be used as airtight containers.
  • a sheet-form deoxidizer 1 is used as a pasteboard, a food product 3 is placed on top of this sheet-form deoxidizer 1, this is introduced into an airtight container 2 consisting of a packaging pouch composed of an airtight film, and the airtight container 2 is then heat-sealed.
  • a food product 3 is placed inside an airtight container 2 consisting of an airtight plastic tray, the inside surface is applied with a label-type sheet-form deoxidizer 1, and the airtight container 2 is heat-sealed with an airtight lid 21.
  • a venthole 23 is formed; a food product is placed into a container 22, where the breathable surface of a sheet-form deoxidizer 1 is brought into contact with and bonded to the area around the venthole 23; this is then introduced into an airtight container 2 consisting of a packaging pouch composed of an airtight film; and the airtight container 2 is then heat-sealed.
  • a food product 3 is placed into an airtight container 2 consisting of an airtight plastic tray, and a lid 21 heat-sealed with the tray.
  • a venthole 23 is formed in the lid 21 on which a sheet-form deoxidizer 1 is mounted in such a manner that the air-permeable face of the deoxidizer 1 covers the venthole 23.
  • the food product 3 sealably held inside the airtight container 2 can be directly cooked in a microwave oven by making holes in the airtight container 2 as needed to break the airtightness of the airtight container 2 without removing the sheet-form deoxidizer 1 from the airtight container 2.
  • Examples of food products 3 packaged in the package of the present invention include semi- and precooked foods and various other microwaveable foods. Specific examples include cooked rice and red beans, a Chinese dish of fried rice, cooked rice, boiled rice with assorted mixtures, and other processed grain foods; hamburgers, nuggets, croquettes, bite-size cutlets, hot dogs, various types of fries, and other fried foods; grilled fish, steamed fish, foil-grilled fish, cubed fish, and other types of processed seafood; fried dumplings stuffed with minced pork, shao-mai, and other steamed foods; boiled beans, egg rolls, cooked food, foods fried without coatings, stir-fried vegetables, and other side dishes; half-dried squid, fried sausage, green soybeans, roasted fish, and other hors d'oeuvres; pies, bean-jam pancakes, steamed dumplings, and other Japanese and Western confections; baked potatoes, chow mein, fried noodles, spaghettis, and various other types of noodles; curries,
  • precooked side dishes, hors d'oeuvres, fried foods, and other food products are often cooked in a microwave oven and served at home, and can thus be effectively used as the food products to be stored in the microwaveable food packing pertaining to the present invention.
  • a disk with a diameter of 60 mm ⁇ was subsequently punched out from this deoxidizing sheet.
  • a disk with a diameter of 70 mm ⁇ was also punched out from a breathable sheet obtained by the hot lamination of a nonwoven fabric ("Luxer") and a perforated film having small holes with a diameter of 0.8 mm at a hole area rate of 7% onto a film produced by the lamination of drawn nylon (thickness: 15 ⁇ m) and polyethylene (thickness: 15 ⁇ m).
  • the two resulting discoid breathable sheets were superposed in such a way that the Rukusa surfaces faced inward, the aforementioned discoid deoxidizing sheet was sandwiched between them, and the edges were heat-sealed, yielding a pasteboard-shape sheet-form deoxidizer 1 such as that shown in Fig. 1.
  • a grilled rice ball was placed on top of the pasteboard-shape sheet-form deoxidizer 1, and this was introduced into an airtight container 2 made of a packaging pouch composed of an airtight film obtained by laminating vinylidene chloride coat nylon and polyethylene.
  • the pouch opening of the airtight container 2 was subsequently heat-sealed, yielding a grilled rice ball package, This was then kept for 14 days at a temperature of 10°C.
  • a disk with a diameter of 30 mm ⁇ was stamped out of a 1-mm deoxidizing sheet manufactured in the same manner as in Embodiment 1, yielding a discoid deoxidizing sheet.
  • a perforated polyethylene film was hot-laminated onto water- and oil-resistant paper, yielding a breathable packaging material.
  • An adhesive based on a synthetic rubber elastomer was also applied to one side of a white polypropylene film (thickness: 35 ⁇ m) to form a tackifying layer, and silicon coat paper (release paper) was glued to one side thereof.
  • the same adhesive as above was subsequently applied to the other side of the aforementioned white polypropylene film, yielding a tackifying sheet provided with a separator layer.
  • the aforementioned discoid deoxidizing sheet was subsequently placed on the adhesive side of the tackifying sheet, the aforementioned breathable packaging material was superposed on top thereof to cover the tackifying sheet, and this was compression-bonded to bond the breathable packaging material and the tackifier surface of the tackifying sheet along the edges of the discoid deoxidizing sheet.
  • An area with a diameter of 50 mm ⁇ was subsequently stamped out around the aforementioned discoid deoxidizing sheet, yielding a label-type sheet-form deoxidizer.
  • a grilled rice ball was subsequently placed inside the same airtight container as that in Embodiment 1, the separator layer of the label-type sheet-form deoxidizer was peeled off, and this was pasted to the inside of the aforementioned airtight container.
  • the pouch opening of the airtight container was heat-sealed, yielding a grilled rice ball package. This was subsequently kept for 14 days at a temperature of 10°C, and the same tests as in Embodiment 1 were then conducted. The results are shown in Table 1.
  • a 1-mm deoxidizing sheet manufactured in the same manner as in Embodiment 1 was bonded to one side of a water-resistant nonwoven fabric ("TYVEK”) with the aid of a highly breathable tackifying sheet (manufactured by Nitto Denko Corp.), and a double-sided tackifying tape (width: 10 mm) provided with release paper was bonded to the other side at 40-mm intervals.
  • TYVEK water-resistant nonwoven fabric
  • a double-sided tackifying tape width: 10 mm
  • This was drawn into an angular shape with the aid of a cutting die measuring 60 mm ⁇ 50 mm in such a way that a double-sided tape was positioned at both ends.
  • a commercial label (60 mm ⁇ 50 mm) comprising an adhesive layer and a paper label containing the trade name, bar code, and other information was subsequently bonded to the deoxidizing sheet of the resulting sheet to produce a label-type sheet-form deoxidizer endowed with an identification function.
  • a grilled rice ball was placed in a container 22 (length: 120 mm, width: 100 mm, depth: 35 mm) that was equipped with a polypropylene lid provided with an opening 23 measuring 40 mm ⁇ 40 mm, and the lid was replaced.
  • the double-sided tackifying tape of the aforementioned label-type sheet-form deoxidizer 1 was subsequently peeled off to expose the tackifying surface, and this label-type sheet-form deoxidizer 1 was bonded and fixed to the lid in such a way that the aforementioned opening 23 was covered.
  • the container 22 was subsequently placed into the same airtight container 2 (15 cm ⁇ 18 cm) as in Embodiment 1, and the pouch opening was heat-sealed, yielding a grilled rice ball package.
  • This grilled rice ball package was subsequently kept for 14 days at a temperature of 10°C, and the same tests as in Embodiment 1 were then conducted. The results are shown in Table 1.
  • the back surface of a polyethylene terephthalate film (thickness: 12 ⁇ m) was imprinted, and a urethane-based adhesive was applied in a thickness of 30 ⁇ m to the other side, yielding an airtight sheet (width: 60 mm) having an adhesive on the inner surface and an imprint on the front surface.
  • a fibrous adhesive manufactured by Nitto Denko was superposed as a breathable adhesive layer onto a water-resistant nonwoven fabric ("Luxer"), and a 1-mm deoxidizing sheet manufactured in the same manner as in Embodiment 1 was then laminated on top thereof.
  • This sheet was subsequently cut into squares measuring 40 mm x 40 mm, yielding laminates.
  • the aforementioned laminates were subsequently aligned with the surface of the deoxidizing sheet and successively bonded to the surface of the adhesive layer on the aforementioned airtight sheet at 20-mm intervals.
  • Silicone-based release paper (width: 60 mm) was then superposed on top thereof and bonded to the tackifying layer of the airtight sheet exposed along the two side edges and between the aforementioned laminates. This was subsequently half-cut with a cutting die from the side of the airtight -sheet over an area measuring 55 mm ⁇ 55 mm around the aforementioned laminates while the release paper was left intact.
  • a continuous article consisting of a plurality of continuously formed label-type sheet-form deoxidizers was thus produced.
  • a grilled rice ball was placed inside an airtight container (tray) 2 (width: 100 mm, length; 120 mm, depth: 35 mm) having a multilayer structure composed of polypropylene, an adhesive layer, EVOH, another adhesive layer, and again polypropylene.
  • An opening 23 measuring 30 mm ⁇ 30 mm was subsequently formed, and the top of the airtight container 2 was sealed with an airtight film consisting of a laminate of polypropylene and vinylidene chloride coat nylon.
  • One of the label-type sheet-form deoxidizers 1 was subsequently peeled off from the aforementioned continuous article, the breathable surface thereof was pressed against the opening 23 of the airtight container 2 to close this opening, and the exposed tackifying layer was bonded to the entire surface of the top film to fix the label-type sheet-form deoxidizer 1, yielding a grilled rice ball package.
  • This grilled rice ball package was subsequently kept for 14 days at a temperature of 10°C, and the same tests as in Embodiment 1 were then conducted. The results are shown in Table 1.
  • a grilled rice ball package was prepared in the same manner as in Embodiment 1, except that a commercially available deoxidizer (deoxidizing yield: 100 mL; dimensions: 50 mm ⁇ 50 mm) obtained by packing a pouch with a particulate deoxidizer based on an iron powder was used instead of the sheet-form deoxidizer.
  • a commercially available deoxidizer deoxidizing yield: 100 mL; dimensions: 50 mm ⁇ 50 mm
  • This grilled rice ball package was kept for 14 days at a temperature of 10°C, and the same tests as in Embodiment 1 were then conducted. The results are shown in Table 1.
  • a grilled rice ball package was prepared in the same manner as in Embodiment 1, except that no deoxidizer was used.
  • the microwaveable food packages (Embodiments 1 through 4) pertaining to the present invention have excellent microwave resistance and oxygen absorption characteristics.
  • a sheet-form deoxidizer has excellent microwave resistance, allowing a consumer who bought the microwaveable food package to irradiate it with microwaves in a microwave oven, to heat it, and to cook it safely and conveniently without causing the pouch to rupture and spill the contents as a result of microwave irradiation, or causing other safety or hygiene problems associated with conventional deoxidizers based on iron powders.
  • food manufacturers, distributors, and retailers freeze and store food products at low temperatures in the form of the food packages of the present invention, making it possible to balance production and inventory and to cook the products by irradiation with microwaves for rapid delivery to consumers.
  • the sheet-form deoxidizer is easy to manufacture, and a food package can be easily filled with it, increasing the rate of production of microwaveable food packages and making commercial production possible.
  • the microwaveable food package pertaining to the present invention has excellent deoxidizing characteristics; can be used in applications aimed at retaining the quality of semi-cooked food products, cooked food products, and a variety of food products designed for cooking in microwave ovens; and can significantly contribute to the spread of microwaveable foods.

Claims (12)

  1. Eine mikrowellentaugliche Lebensmittelverpackung, die erhaltbar ist durch abdichtendes Verschließen eines Lebensmittelproduktes innerhalb eines luftdichten Behälters (2) zusammen mit einem blattförmigen, sauerstoffabsorbierenden Mittel, welches erhalten wird durch Einpacken eines Produktes in ein atmungsfähiges Verpackungsmaterial, welches Produkt herstellbar ist mittels Durchkneten einer auf Eisen basierenden, desoxydierenden Zusammensetzung mit einem thermoplastischen Kunststoff und durch Ausbilden eines Bogens (1).
  2. Eine mikrowellentaugliche Lebensmittelverpackung nach Anspruch 1, worin dieses blattförmige sauerstoffabsorbierende Mittel gezogen worden ist.
  3. Eine mikrowellentaugliche Lebensmittelverpackung nach Anspruch 1 oder 2, worin dieses blattförmige sauerstoffabsorbierende Mittel erhalten wird durch Laminieren eines Produktes mit einem atmungsfähigen Verpackungsmaterial, welches Produkt hergestellt wird mittels Durchkneten einer auf Eisen basierenden, sauerstoffabsorbierenden Mittel-Zusammensetzung mit einem thermoplastischen Kunststoff und durch Ausformen eines Bogens.
  4. Eine mikrowellentaugliche Lebensmittelverpackung nach mindestens einem der vorstehenden Ansprüche, worin die Oberfläche von diesem blattförmigen sauerstoffabsorbierenen Mittel mit einer klebenden Schicht versehen ist.
  5. Eine mikrowellentaugliche Lebensmittelverpackung nach mindestens einem der vorstehenden Ansprüche, worin dieses Lebensmittelprodukt von diesem blattförmigen sauerstoffabsorbierenden Mittel getragen wird.
  6. Eine mikrowellentaugliche Lebensmittelverpackung nach mindestens einem der vorstehenden Ansprüche, worin dieses blattförmige sauerstoffabsorbierende Mittel an der Innenseite von diesem luftdichten Behälter angeklebt ist.
  7. Eine mikrowellentaugliche Lebensmittelverpackung nach mindestens einem der vorstehenden Ansprüche, worin diese auf Eisen basierende, sauerstoffabsorbierende Mittel-Zusammensetzung ein Eisenpulver und ein Metallhalogenidsalz enthält.
  8. Eine mikrowellentaugliche Lebensmittelverpackung nach Anspruch 7, worin diese auf Eisen basierende, sauerstoffabsorbierende Mittel-Zusammensetzung erhalten wird durch Überziehen der Oberfläche eines Eisenpulvers mit einem Metallhalogenidsalz.
  9. Eine mikrowellentaugliche Lebensmittelverpackung nach Anspruch 7, worin diese auf Eisen basierende, sauerstoffabsorbierende Mittel-Zusammensetzung erhalten wird durch Dispergieren und Ablagern eines Metallhalogenidsalzes auf einem Eisenpulver.
  10. Eine mikrowellentaugliche Lebensmittelverpackung nach mindestens einem der vorstehenden Ansprüche, worin dieser thermoplastische Kunststoff ein auf Olefin basierender Kunststoff ist.
  11. Ein Verfahren zur Herstellung einer mikrowellentauglichen Lebensmittelverpackung, mit den Verfahrensschritten: Durchkneten einer auf Eisen basierenden, sauerstoffabsorbierenden Mittel-Zusammensetzung und eines thermoplastischen Kunststoffs sowie Ausbilden dieser zu einem Bogen, um ein blattförmiges, sauerstoffabsorbierendes Mittel (1) zu erhalten; und
    Plazieren eines Lebensmittelproduktes und dieses blattförmgien, sauerstoffabsorbierenden Mittels in einen Behälter (2) und anschließendes Abdichten dieses Behälters, um einen luftdichten Behälter auszubilden.
  12. Ein Verfahren zur Verwendung einer mikrowellentauglichen Lebensmittelverpackung, mit den Verfahrensschritten:
    Bestrahlen einer Verpackung mit Mikrowellen, wobei diese Verpackung enthält:
    ein innerhalb eines luftdichten Behälters (2) abdichtend angebrachtes Lebensmittelprodukt zusammen mit einem blattförmigen Sauerstoff-Scavenger (1), der erhalten wird mittels Durchkneten einer auf Eisen basierenden Sauerstoff-Scavenger-Zusammensetzung zusammen mit einem thermoplastischen Kunststoff und durch Ausbilden eines Bogens.
EP19960300423 1995-01-24 1996-01-23 Mikrowellenfeste Lebensmittelverpackung sowie Verfahren zur Herstellen derselben Expired - Lifetime EP0728678B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP00920295A JP3528873B2 (ja) 1995-01-24 1995-01-24 電子レンジ調理用食品包装体及びその包装方法
JP920295 1995-01-24
JP9202/95 1995-01-24

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EP0728678A2 EP0728678A2 (de) 1996-08-28
EP0728678A3 EP0728678A3 (de) 1997-02-12
EP0728678B1 true EP0728678B1 (de) 1999-09-15

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JP3876938B2 (ja) * 1997-03-13 2007-02-07 三菱瓦斯化学株式会社 惣菜類の保存方法
GB2352706A (en) * 1999-08-03 2001-02-07 Mars Uk Ltd Shelf stable precooked cereal product in pouch
EP1462383A4 (de) * 2001-11-01 2006-04-19 Idemitsu Unitech Co Ltd Die atmosphäre verbesserndes band zur verpackung, verpackung mit dem atmosphären verbessernden band und verfahren zur herstellung der verpackung, verpackungsbehälter mit dem atmosphärenverbessernden band, eingriffsvorrichtung und verpackung mit der eingriffsvorrichtung
JP5754591B2 (ja) * 2011-08-22 2015-07-29 凸版印刷株式会社 ギョーザ用電子レンジ加熱容器包装体
JP6398384B2 (ja) * 2014-07-01 2018-10-03 凸版印刷株式会社 パッケージ
JP5752311B1 (ja) * 2014-11-18 2015-07-22 ユニ・チャーム株式会社 ペットフード包装体
JP2017538635A (ja) * 2014-12-19 2017-12-28 ジー．デー ソチエタ ペル アツィオニＧ．Ｄ Ｓｏｃｉｅｔａ Ｐｅｒ Ａｚｉｏｎｉ 遊離酸素を吸収するための手段を具備する紙巻タバコの包み及びそれぞれの包装方法
EP3741689A1 (de) * 2019-05-21 2020-11-25 Elizabeth Europe Ausrüstung für blistermaschine für produkte, die eine absorption von flüchtigen verbindungen benötigen
WO2024005551A1 (ko) * 2022-06-28 2024-01-04 김환 무연 일회용 조리 용기 및 이를 이용한 간편식

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JPH089396B2 (ja) * 1986-09-19 1996-01-31 三菱瓦斯化学株式会社 脱酸素剤包装体
JP2754595B2 (ja) * 1987-12-02 1998-05-20 三菱瓦斯化学株式会社 脱酸素剤包装体
JP2782727B2 (ja) * 1988-09-08 1998-08-06 三菱瓦斯化学株式会社 フィルム状脱酸素剤
US5241149A (en) * 1990-10-15 1993-08-31 Mitsubishi Gas Chemical Company, Inc. Food packing body for heat and microwave treatment
EP0567529B2 (de) * 1991-01-07 2009-12-02 Multisorb Technologies, Inc. Sauerstoffabsorbierendes etikett

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JP3528873B2 (ja) 2004-05-24
JPH08198342A (ja) 1996-08-06
EP0728678A3 (de) 1997-02-12
DE69604213T2 (de) 2000-05-11
DE69604213D1 (de) 1999-10-21
EP0728678A2 (de) 1996-08-28

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