EP1122189B1 - Verpackungsmaterial sowie behälter zur aufnahme von getränken und nahrungsmitteln - Google Patents

Verpackungsmaterial sowie behälter zur aufnahme von getränken und nahrungsmitteln Download PDF

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Publication number
EP1122189B1
EP1122189B1 EP99922496A EP99922496A EP1122189B1 EP 1122189 B1 EP1122189 B1 EP 1122189B1 EP 99922496 A EP99922496 A EP 99922496A EP 99922496 A EP99922496 A EP 99922496A EP 1122189 B1 EP1122189 B1 EP 1122189B1
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EP
European Patent Office
Prior art keywords
gas discharging
cover
container
base
discharging hole
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.)
Expired - Lifetime
Application number
EP99922496A
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English (en)
French (fr)
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EP1122189A1 (de
EP1122189A4 (de
Inventor
Mamoru Morinaga Milk Industry Co. Ltd. TOMITA
Kazutaka Morinaga Milk Industry Co. Ltd. MAKINO
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Morinaga Milk Industry Co Ltd
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Morinaga Milk Industry Co Ltd
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Publication date
Application filed by Morinaga Milk Industry Co Ltd filed Critical Morinaga Milk Industry Co Ltd
Priority to DK99922496T priority Critical patent/DK1122189T3/da
Publication of EP1122189A1 publication Critical patent/EP1122189A1/de
Publication of EP1122189A4 publication Critical patent/EP1122189A4/de
Application granted granted Critical
Publication of EP1122189B1 publication Critical patent/EP1122189B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/26—Articles or materials wholly enclosed in laminated sheets or wrapper blanks
    • 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
    • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/22—Details
    • B65D77/225—Pressure relief-valves incorporated in a container wall, e.g. valves comprising at least one elastic element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package
    • B65D81/3446—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package specially adapted to be heated by microwaves
    • B65D81/3453—Rigid containers, e.g. trays, bottles, boxes, cups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2205/00—Venting means

Definitions

  • the present invention relates to a packaging material, which is used as a lid for sealing off a container which is filled with beverage such as coffee and tea, liquid-state food such as soup and miso soup, cooked rice, food containing a large amount of moisture such as curry, frozen food which becomes liquid-state food or food containing a large amount of moisture when heated, and the like (These will be hereinafter referred to collectively as "beverage and/or food.") or used as a package which is shaped as a bag, a tube or the like for packaging beverage and/or food (Packages shaped as a bag, a tube or the like will be hereinafter referred to collectively as "packing bags.”), and to a container for sealing beverage and/or food.
  • beverage such as coffee and tea
  • liquid-state food such as soup and miso soup, cooked rice
  • food containing a large amount of moisture such as curry
  • frozen food which becomes liquid-state food or food containing a large amount of moisture when heated, and the like
  • packaging bags Packages
  • the present invention relates to a packaging material and a beverage/food sealing container which allow, when it is necessary to heat up beverage and/or food filled in a container or packing bag prior to eating or drinking, to microwave the sealed container or packing bag without opening a lid which seals off the container or opening the packing bag.
  • a container having a structure that a lid for sealing off the container is a multi-layer lid, an upper layer of the lid can be peeled off and a degassing hole is formed in a lower layer
  • a packing material obtained by laminating or otherwise appropriately joining a breathable film or a paper and a synthesized resin film having an opening portion to each other is known (Japanese Patent Publication No. S63-63353 and Japanese Utility Model Publication No. S63-59867; hereinafter referred to as "conventional technique 2").
  • the technique since a gas discharging hole is formed as the upper layer of the lid is peeled off, the technique, although not requiring a tool for opening the hole, causes the pressure inside the container to increase if the container is heated without peeling off the upper layer of the lid and may permit the container to blow out. Further, after the upper layer of the lid is peeled off, since there is the opening in the lid, it is difficult to transport the container.
  • JP 06329179 discloses an automatic cooking package consisting of a flexible container and a pressure-regulating valve.
  • the pressure-regulating valve consists of a circular flexible sheet which is coated with an adhesive on one side and in the center has a part not coated with the adhesive.
  • the pressure-regulating valve is attached by adhesion over a hole in the top sheet of the package.
  • an increasing pressure acts on the pressure regulating valve through the hole and a rise of the pressure above a certain level causes the pressure-regulating valve to release. Part of it, however, remains adhered to the container and, when the pressure falls below the specified point, the pressure-regulating valve resumes the adhesion as before.
  • An object of the present invention is to provide for a packaging material for sealing beverage and/or food, with which it is possible to heat up the beverage and/or food using a microwave oven without preliminarily treating a packing bag of the packaging material in which the beverage and/or food is sealed up.
  • object of the present invention is to provide for a container for sealing beverage and/or food, with which it is possible to heat up the beverage and/or food using a microwave oven without preliminarily treating the container in which the beverage and/or food is sealed up.
  • a first invention of the present application is a packaging material comprising: an unbreathable base containing a gas discharging hole; and an unbreathable cover which is adhered to one surface of said base so as to cover said gas discharging hole, wherein said cover is adhered to said base at an adhesion strength which permits at least a portion of said cover to be peeled off when excess pressure generated by beverage and/or food which is enclosed by said packaging material, acts upon said cover through said gas discharging hole, thereby to relieve said excess pressure, characterised in that said gas discharging hole comprises a reclosing prevention cut at a peripheral edge of said hole and/or said unbreathable base comprises one or more reclosing prevention cuts other than at said gas discharging hole; and wherein pieces formed by said cuts are capable of being heated up and deformed due to excess pressure to prevent the cover from reclosing the gas discharging hole.
  • the adhesion strength between the base and the cover is 98 cN/15mm 1618 cN/15mm (100gf/15mm - 1650gf/15mm).
  • the cover comprises a second gas discharging hole, and the second gas discharging hole is formed at a position not overlapping the gas discharging hole of the base.
  • only a portion of the cover is adhered to said base at an adhesion strength which permits said portion of said cover to be peeled off when excess pressure generated from beverage and/or food acts upon said portion of said cover through said gas discharging hole to form a gas discharging path linking said gas discharging hole with outside said packaging material to relieve said excess pressure, wherein said portion of said cover covers said gas discharging hole and said reclosing prevention cuts.
  • the gas discharging path is formed as the base and the cover are adhered to each other at an adhesion strength of 49 cN/ 15mm-784 cN/ 15mm (50gf/15mm - 800gf/15mm).
  • the gas discharging path is formed as the base and the cover are adhered to each other at an adhesion strength which is 5 % - 80 % of an adhesion strength other than at the gas discharging path.
  • the cover comprises a second gas discharging hole at a position not overlapping the gas discharging hole of the base, and the gas discharging path is formed between the gas discharging hole and the second gas discharging hole.
  • a second invention of the present application is a container for sealing beverage and/or food, comprising: a container main part which transmits a microwave; and a lid which seals off the container main part, wherein the lid comprises an unbreathable base containing a gas discharging hole and an unbreathable cover which is adhered to a surface of the base so as to cover the gas discharging hole, and the cover is adhered to the base at such an adhesion strength which permits at least a portion of the cover to be peeled off when the pressure of excessive gas, which is generated from the beverage and/or food which is wrapped in the packaging material, acts upon the cover through the gas discharging hole, thereby to relieve said excess pressure characterised in that said gas discharging hole comprises a reclosing prevention cut at a peripheral edge of said hole and/or said unbreathable base comprises one or more reclosing prevention cuts other than at said gas discharging hole; and wherein pieces formed by said cuts are capable of being heated up and deformed due to excess pressure to prevent the cover from reclosing the gas discharging
  • the adhesion strength between the base and the cover is 98 cN/15mm - 1618 cN/15mm (100gf/15mm - 1650gf/15mm).
  • the cover comprises a second gas discharging hole, and the second gas discharging hole is formed at a position not overlapping the gas discharging hole of the base.
  • the lid comprises a tongue-like protrusion, and the tongue-like protrusion is formed by extending the base.
  • the second gas discharging hole is preferably formed at a position opposite to the tongue-like protrusion.
  • the container main part comprises a microwave shielding layer in a side surface portion, and the microwave shielding layer is disposed so as to cover a portion in which a top surface of the sealed beverage and/or food contacts the container main part
  • the container comprises: a container main part which transmits a microwave; and a lid which seals off the container main part, wherein the lid comprises an unbreathable base containing a gas discharging hole and an unbreathable cover which is adhered to a surface of the base so as to cover the gas discharging hole, a portion of the cover is adhered to the base at such an adhesion strength which permits the portion of the cover to be peeled off when the pressure of excessive gas, which is generated from the beverage and/or food which is wrapped in the packaging material, acts upon the portion of the cover through the gas discharging hole, to form a gas discharging path which links the gas discharging hole with outside the lid to relieve said excess pressure
  • said gas discharging hole comprises a reclosing prevention cut at a peripheral edge of said hole and/or said unbreathable base comprises one or more reclosing prevention cuts other than at said gas discharging hole; and wherein pieces formed by said cuts are capable of being heated up and deformed due to excess pressure to prevent the
  • the gas discharging path is formed from the gas discharging hole to a brim of the lid.
  • the cover comprises a second gas discharging hole at a position not overlapping the gas discharging hole of the base, and the gas discharging path is formed between the gas discharging hole and the second gas discharging hole.
  • the gas discharging path is formed as the base and the cover are adhered to each other at an adhesion strength of 49 cN/15mm - 784 cN/15mm (50gf/15mm-800gf/15mm).
  • the gas discharging path is formed as the base and the cover are adhered to each other at an adhesion strength which is 5%-80 % of an adhesion strength other than at the gas discharging path.
  • the lid comprises a tongue-like protrusion, and the tongue-like protrusion is formed by extending the base.
  • the tongue-like protrusion is preferably formed at a position opposite to a rear end of the gas discharging path.
  • the container main part comprises a microwave shielding layer in a side surface portion, and the microwave shielding layer is disposed so as to cover a portion in which a top surface of the sealed beverage and/or food contacts the container main part
  • the "adhesive strength" is a value which is measured by the following method.
  • Figs. 1 and 2 are a front surface view and a back surface view, respectively, of a lid of a container, which shows an example of some features of the first invention.
  • Figs. 3 and 4 are an X-X' cross sectional view and Y-Y' cross sectional view, respectively, of Fig. 1.
  • Fig. 5 is a cross sectional view of the container which is sealed with the lid.
  • Denoted at A is a main body of the container, denoted at B is the lid, denoted at C is the container, denoted at 1 is a base, denoted at 2 is a cover, denoted at 3 and 6 are adhesive agents, denoted at 4 is a tongue-like protrusion, denoted at 5 is are gas discharging holes, and denoted at 7 is a flange.
  • Fig. 6 is an appearance view showing examples of some features of the first invention.
  • Fig. 7 is a partially enlarged cross sectional view along a Z-Z' line in Fig. 6.
  • Denoted at D is a packing bag, denoted at 10 and 11 are horizontal seal portions, and denoted at 12 is a vertical seal portion.
  • Fig. 8 is a perspective appearance view showing examples of some features of a container according to the second invention.
  • Fig. 9 is a partially enlarged cross sectional view along a V-V' line in Fig. 8. Denoted at 8 is a second gas discharging hole.
  • Fig. 10 is a perspective appearance view showing a function of a tongue-like protrusion in the container shown in Fig. 8, wherein denoted at E is an over cap.
  • Fig. 11 is an appearance view of a packing bag, which shows examples of some features of a packing material according to the first invention.
  • Fig. 12 is a partially enlarged cross sectional view along a W-W' line in Fig. 11. Denoted at F is the packing bag.
  • Figs. 13 and 14 are a front surface view and a back surface view, respectively, of a lid of a container, which shows examples of some features of a packaging material according to the first invention.
  • Figs. 15 and 16 are partially enlarged cross sectional views along an X-X' line and Y-Y' line, respectively, in Fig. 13.
  • Fig. 17 is a partial cross sectional view of the container which is sealed with the lid. Denoted at 9 are gas discharging paths.
  • Fig. 18 is an appearance view of some examples of some features of a packaging material according to the first invention.
  • Fig. 19 is a partially enlarged cross sectional view along a Z-Z' line in Fig. 18.
  • Fig. 20 is a perspective appearance view showing some examples of some features of a container according to the second invention.
  • Fig. 21 is a partially enlarged cross sectional view along a V-V line in Fig. 20.
  • Fig. 22 is an appearance view of a packing bag, which shows some examples of some features of a packaging material according to the first invention.
  • Figs. 23 and 24 are back surface views of lids which show some examples of some features of a container according to the second invention. Denoted at 13 are reclosing prevention cuts.
  • Fig. 25 is a back surface view showing some examples of some features of a lid which is used for a container according to the second invention. Denoted at 14 are reclosing prevention cuts.
  • Fig. 26 is a perspective appearance view showing still other examples of features of a lid which is used for a container according to the second invention.
  • Fig. 27 is a partially enlarged cross sectional view along a U-U' line in Fig. 26.
  • Denoted at 15 is a step
  • denoted at 16 is an aluminum foil layer
  • denoted at 17 is a heat insulation layer
  • denoted at 18 is a coating layer.
  • a packaging material according to the first invention comprises a base and a cover, and if the packaging material is to be used to seal beverage and/or food which is to be heated up with a microwave oven, the packaging material is formed by a non-metallic unbreathable material.
  • a non-metallic unbreathable material examples include plastic materials of an olefin resin, such as polyester, nylon, polypropylene, polyethylene and polystyrene, a laminated material of these plastic materials, a paper, and a laminated material of a paper and a plastic material.
  • a metallic material such as an aluminum foil may be used.
  • the base of the packaging material according to the first invention has a thickness of 4 ⁇ m - 300 ⁇ m, and preferably, 50 ⁇ m - 100 ⁇ m. Since the base is adhered to itself or a flange portion or the like of a container at a large strength and subjected to relatively large force when peeled off, it is proper that the thickness is as described above for the purpose of preventing destruction of the base during peeling off.
  • the base comprises a gas discharging hole for ejecting excessive gas from inside a container or packing bag which is formed using this packaging material.
  • a shape of hole and how many such holes are to be formed may be appropriately determined in accordance with the volume of the container or packing bag, the amount of beverage and/or food to be filled in, a water content, etc.
  • the gas discharging hole only has to attain the objective to discharge excessive gas from inside the container or packing bag, and therefore, the shape of the gas discharging hole may be any form, such as an elliptical shape, a polygonal shape and a letter-like shape, in addition to a circular shape as that according to the embodiment With respect to the size of the gas discharging hole as well, the size may be any size to the extent that it is possible to attain the objective. This applies similarly to the number of the gas discharging holes.
  • the adhesive agent examples include polypropylene, polyethylene, an ethylene-acrylic acid resin, an ethylene-vinyl acetate resin, a polyurethane resin, an acrylic resin, wax, etc.
  • An adhesive layer of the adhesive agent as such has a thickness of approximately 1 ⁇ m - 50 ⁇ m, and preferably, approximately 2 ⁇ m - 30 ⁇ m.
  • the packaging material according to the first invention is formed in the shape of a lid for a container, a bag, a tube or the like, and used for packaging beverage and/or food.
  • the packaging material is formed in approximately the same shape as an outer shape of a flange portion of a container, for example, and after filling beverage and/or food in the container, attached to the flange portion of the container. Attaching to the container may be bonding using an adhesive agent or the like at a relatively large strength.
  • the packaging material When the packaging material is to be used as a packing bag, one sheet of the packaging material having an appropriate size is bent and the base is relatively strongly adhered to itself on two sides, and after filling in beverage and/or food on one side which is open, the base is relatively strongly adhered to itself at the opening, for instance.
  • the bases are adhered to each other on three sides, and after filling in beverage and/or food on one side which is open, the bases at the opening are adhered to each other with an adhesive agent at a relatively large strength.
  • the container may be sealed off with the packaging material.
  • the beverage and/or food is sterilized in advance, filled in a sterile state within the container or packing bag, and sealed up in the container or packing bag. If sterilization other than heat sterilization is to be used, after filling the beverage and/or food within the container or packing bag and sealing off the container or packing bag, the sealed container or packing bag may be sterilized as it is with the beverage and/or food contained inside.
  • Base-to-base adhesion or adhesion of the base and other item can be achieved with a resin, such as polypropylene, polyethylene, polystyrene, an ethylene-acrylic acid resin and an ethylene-vinyl acetate resin, or an adhesive agent.
  • An adhesion strength is strong in proportion to the adhesion strength between the base and the cover of the packaging material.
  • the adhesion strength is 294 cN/15mm (300gf/15mm) or larger, and preferably, 784 cN/15mm - 1470 cN/15mm (800gf/15mm-1500gf/15mm) approximately, at an ordinary temperature.
  • the adhesion strength between the base and the cover of the packaging material according to the first invention is desirably adjusted to be approximately 2/3 or smaller of the strength of base-to-base adhesion or adhesion of the base and other item.
  • the packaging material according to the first invention is formed by the unbreathable base and the unbreathable cover, it is possible to hygienically preserve beverage and/or food which is sealed in a container whose lid is this packaging material or a packing bag formed by this packaging material. Moreover, even when heated up in a microwave oven, such a container or packing bag does not blow out, consequently make the microwave oven dirty inside, or hence bear a risk of causing boilover of heated beverage and/or food and thereby burning or otherwise injuring people. When microwaved in a store of purchase as well, such a container or packing bag can be easily brought outside the store. In addition, since such a container or packing bag is sealed off with the cover, excessive vaporization, sudden boiling or the like of moisture associated with heating can be effectively prevented.
  • a container or packing bag using the packaging material according to the first invention is to preserve beverage and/or food which emits gas during preservation (such as fermented vegetables), since excessive gas created inside the container or packing bag escapes through the gas discharging hole of the base of the packaging material, the package does not break to thereby enable safe preservation.
  • gas during preservation such as fermented vegetables
  • the second gas discharging hole does not have to be always wide open, but may be merely a small cut in the cover, for instance. At least, the second gas discharging hole has to open when gas, vapor or the like escapes at the gas discharging hole which is formed in the base.
  • gas, vapor or the like escapes at the gas discharging hole which is formed in the base.
  • the second gas discharging hole opened in the cover only if peeling off of the cover occurs over a narrow space between the gas discharging hole of the base and the second gas discharging hole, it is possible to link inside the container or packing bag with outside the container or packing bag. Considering such a function of the second gas discharging hole, it is further desirable that the second gas discharging hole is located appropriately close to the gas discharging hole of the base.
  • the second gas discharging hole may be formed in any shape other than the cut-like shape according to the embodiment, such as a circular shape, an elliptic shape, a polygonal shape and a letter-like shape.
  • the size may be any size to the extent that it is possible to attain the objective. This applies similarly to the number of the holes.
  • a gas discharging path is formed in the packaging material according to the first invention.
  • the gas discharging path is formed by reducing an adhesion strength between the base and the cover than an adhesion strength in other portion, at a position which links the gas discharging hole with outside the packaging material.
  • the gas discharging path is formed such that a portion of the cover falls off from the base due to the pressure of excessive gas which is discharged through the gas discharging hole of the base, and the thickness of the adhesive layer of the adhesive agent in this portion is approximately 1 ⁇ m - 50 ⁇ m, and preferably, 2 ⁇ m - 30 ⁇ m approximately.
  • an adhesion strength between the base and the cover in the portion wherein the gas discharging path is formed is approximately 49 cN/15mm-784 cN/15mm (50gf/15mm - 800gf/15mm), and preferably, 98 cN/15mm - 392 cN/15mm (100gf/15mm - 400gf/15mm) approximately.
  • adhesion is insufficient and therefore may damage sealing if the adhesion strength is smaller than 49 cN/15mm (50gf/15mm) at an ordinary temperature, whereas if the adhesion strength exceeds 784 cN/15mm (800gf/15mm) at an ordinary temperature, the pressure of gas from within a container or packing bag fails to cause peeling off of the cover from the base, and therefore, to open through the gas discharging path, which may damage the container or packing bag.
  • the adhesion strength between the base and the cover at the gas discharging path is desirably 5% - 80 % of an adhesion strength in other portion except for the gas discharging path.
  • the adhesion strength between the base and the cover except at the gas discharging path is 784 cN/15mm - 1960 cN/15mm (800gf /15mm-2000gf/15mm) at an ordinary temperature. With the adhesion strength in this range, the pressure of excessive gas will not peel off the cover other than at the gas discharging path.
  • a plurality of such gas discharging paths may be formed with respect to one gas discharging hole.
  • the only requirement is to link inside the package with outside the package through any one of the gas discharging paths, a reliability of discharging gas is enhanced.
  • more than one gas discharging holes may be formed instead of forming only one gas discharging hole.
  • the adhesion strength between the base and the cover corresponding to the gas discharging path is weaker than the adhesion strength in the other portion, when a container or packing bag is heated, the pressure of excessive gas generated from beverage and/or food quickly opens through the gas discharging path, although the other portion does not see peeling off of the cover from the base. This suppresses a possibility of the heated beverage and/or food boiling over extremely small. Further, this does not lead to a loud explosive sound associated with peeling off of the entire cover from the base.
  • the gas discharging path is opened through by the pressure of excessive gas discharged through the gas discharging hole of the base.
  • this is fundamentally different in principle from a technique (such as that described in Japanese Patent Application Laid-Open Gazette No. 8-151084) according to which a gas discharging path is clogged up with a melting material which melts at a high temperature and as the melting material melts away under heat during heating of a container or packing bag using a microwave oven, the gas discharging path is opened through.
  • the packaging material according to the second invention is less expensive than to use such a melting material and is totally free from a risk of a melting material getting mixed within beverage and/or food.
  • the second gas discharging hole does not have to be always wide open, but may be merely a small cut in the cover, for instance. At least, the second gas discharging hole has to open when excessive gas, vapor or the like escapes at the gas discharging hole which is formed in the base.
  • the gas discharging path is located at such a position which allows to link the gas discharging hole of the base with the second gas discharging hole.
  • the gas discharging path has to be opened only between at least the gas discharging hole of the base and the second gas discharging hole.
  • the second gas discharging hole is located appropriately close to the gas discharging hole of the base (at a position in the range of 2mm - 30 mm from the hole, and preferably, 5mm - 10 mm from the hole).
  • the second invention is directed to a container for sealing beverage and/or food, using the packing material according to the first invention.
  • the container according to the second invention comprises a container main part in which beverage and/or food is filled and a lid formed by the packaging material according to the first invention.
  • the container main part is formed by a microwave-transmitting material which can be microwaved, and is a vessel-like molded item of a synthetic resin, a paper treated with a synthetic resin, glass, ceramic or the like.
  • the lid is a molded item of the packaging material according to the first invention, whose base is adhered to an opening of the container.
  • the lid comprises a tongue-like protrusion.
  • the tongue-like protrusion is means for firmly holding the lid with fingers to open the lid. While an entire layer of the lid (integrated layer of the base and the cover which are adhered to each other) may be extended, the base is preferably extended to form the tongue-like protrusion. In other words, since the base portion of the lid is to be adhered to the container main part, it is possible to entirely open the lid member only if the base is peeled off from the container main part.
  • the flexibility of the tongue-like protrusion is larger than where the entire layer of the lid is extended to form the tongue-like protrusion, thereby further guaranteeing another advantage that when an over cap is to fit with the lid such that the over cap covers the lid, for instance, the tongue-like protrusion naturally bends and receives the over cap smoothly.
  • the second gas discharging hole formed in the cover of the lid at a position not overlapping the gas discharging hole of the base.
  • a function and an effect of the second gas discharging hole are as described earlier in relation to the packaging material according to the first invention.
  • the position of the second gas discharging hole is preferably on the opposite side to the tongue-like protrusion.
  • the opposite side as herein termed, assuming a central portion of the lid is the origin, and a straight line is drawn between the origin and the tongue-like protrusion while a vertical line is drawn normal to this straight line and the origin to thereby divide the lid into two regions by means of the vertical line, "the opposite side” means that the second gas discharging hole is located in one of the two regions in which the tongue-like protrusion is not formed.
  • a reclosing prevention piece serves as means for preventing the cover from tightly adhering to the base again in such a manner.
  • the reclosing prevention piece may be formed by notching cuts in a radial pattern at the peripheral edge of the gas discharging hole, or forming the gas discharging hole in the form of a star, a gear, a cross or the like, for example.
  • one or more than one reclosing prevention cuts may be formed other than at the gas discharging hole of the base, to thereby obtain a similar effect.
  • the cuts are in such a shape which define a reclosing prevention piece when the cuts are opened, and which shape may be a radial shape, a cross shape, a Y-letter shape, a Z-letter shape, a U-, V-, a W-, an M-, an N-, an H-, a S-, an ⁇ -, a E- or a Y-shape, etc.
  • With such cuts formed in the base in a range where the cover is peeled off, excessive gas such as vapor blows out through these cuts as well and the cuts, deformed by heat, stand up. After heating, the cuts now standing prevent the cover from tightly adhering to the base again.
  • the cuts may be used in combination with the precedent aspect according to which the reclosing prevention piece is formed at the peripheral edge of the gas discharging hole.
  • a microwave-shielding layer is formed in a side surface portion of the container main part
  • the microwave-shielding layer is disposed in a range covering a portion in which a top surface of contained beverage and/or food contacts the container main part
  • the microwave-shielding layer is formed by a thin metallic foil, such as an aluminum foil, and disposed to a wall surface of the container main part by a method which requires to adhere the metallic foil to the wall surface of the container main part, a method which requires to form the container main part as a multi-layer part containing the metallic foil, a method which requires to fit a separate metallic cap to the container main part, or other appropriate method.
  • a thin metallic foil such as an aluminum foil
  • the microwave-shielding layer disposed, when the container is set within a microwave oven and beverage and/or food is heated up, a quantity of a microwave falling upon a top surface of the beverage and/or food, which becomes the hottest, is reduced. As a result, it is possible to suppress sudden boiling of the beverage and/or food which is sealed up in the container, and hence, further reliably prevent an accident that the beverage and/or food boils over from the container during heating. Further preferred aspects of the first invention are incorporated in the container
  • the gas discharging path opened through between the base and the cover discharges excessive gas from within the container main part, the base and the cover do not get separated from each other in other portion, and hence, a risk of causing heated beverage and/or food to boil over is small.
  • An explosive sound associated with opening of the gas discharging path is small. Even when the lid is coated with the over cap, the over cap will not get blown away during heating.
  • such a container according to the fourth invention is suitable where beverage and/or food is liquid-state food such as soup and the drinkable.
  • the gas discharging path of the lid is preferably formed from the gas discharging hole to a brim of the lid. In this case, excessive gas discharged through the gas discharging hole of the base travels through the gas discharging path and escapes to outside the container at the brim of the lid.
  • the second gas discharging hole formed in the cover of the lid at a position not overlapping the gas discharging hole of the base.
  • a function and an effect of the second gas discharging hole are as described earlier in relation to the packaging material according to the first invention.
  • the base and the cover are adhered to each other at an adhesion strength in the range of 49 cN/15mm - 784 cN/15mm (50gf/15mm - 800gf/15mm), and preferably, 98 cN/15mm - 392 cN/15mm (100gf/15mm - 400gf/15mm) at an ordinary temperature, to thereby define the gas discharging path of the lid.
  • the adhesion strength of the base and the cover at the gas discharging path is preferably in the range of 5%-80 % of an adhesion strength in other portion.
  • the pressure gas which acts upon the cover through the gas discharging hole from within the container main part peels off the cover only at the gas discharging path while leaving the cover in the other portion adhering to the base.
  • a plurality of such gas discharging paths may be formed with respect to one gas discharging hole.
  • the gas discharging holes may be formed instead of forming only one gas discharging hole.
  • a reclosing prevention cut is formed at a peripheral edge of the gas discharging hole.
  • a reclosing prevention cut is formed in the base other than at the gas discharging hole. Specific structures and functions of these are as described earlier.
  • a microwave-shielding layer is formed in a side surface portion of the container main part.
  • a structure and a function of the microwave-shielding layer are as described earlier.
  • the container according to the second invention or a packing bag using the packaging material according to the first invention when beverage and/or food sealed up in such a container or packing bag is to be microwaved, can be placed inside a microwave oven as it is and heated up without any pre-treatment.
  • a container or packing bag as such is particularly excellent to be used as a container or packing bag which is sold by means of an automatic vending machine which provides beverage and/or food products, such as soup, curry, snacks, Japanese hotchpotch and noodles, which are to be heated up with a microwave oven.
  • Figs. 1 and 2 are a front surface view and a back surface view, respectively, of a lid of a container, which shows examples of some features of an embodiment of the packaging material according to the first invention.
  • Figs. 3 and 4 are an X-X' cross sectional view and a Y-Y' cross sectional view, respectively, of Fig. 1.
  • Fig. 5 is a cross sectional view of the container which is sealed with the lid.
  • the lid (B) formed by the packaging material according to the first invention comprises a base (1) of polyethylene terephthalate (PET) having a thickness of 42 ⁇ m and a cover (2) which is obtained by stacking a PET layer (2a) having a thickness of 12 ⁇ m and a paper layer (2b) having a thickness of 90 ⁇ m one atop the other, such that the base (1) and the cover (2) are adhered to each other using an adhesive agent which contains polyethylene and has an adhesive strength of 245cN/15mm (250gf/15mm) at an ordinary temperature (20°C).
  • PET polyethylene terephthalate
  • cover (2) which is obtained by stacking a PET layer (2a) having a thickness of 12 ⁇ m and a paper layer (2b) having a thickness of 90 ⁇ m one atop the other, such that the base (1) and the cover (2) are adhered to each other using an adhesive agent which contains polyethylene and has an adhesive strength of 245cN/15mm (250gf/15mm) at an ordinary temperature (20°C).
  • a tongue-like protrusion (4) is formed at one end of the lid (B), two gas discharging holes (5) are formed at an end which is approximately opposite to the tongue-like protrusion (4) (i.e., at the other end), and the gas discharging holes (5) are covered with and completely sealed up with the cover (2).
  • the lid (B) is adhered to a flange (7) of a container main part (A: See Fig. 5.) with an adhesive agent (6) which contains polypropylene at an adhesive strength of 980cN/15mm (1000gf/15mm) at an ordinary temperature (20°C).
  • the container (C) To heat up beverage and/or food filled in the container (C: See Fig. 5.) in a microwave oven, the container (C) as it is microwaved without partially or entirely opening the lid (B).
  • the beverage and/or food generates steam due to heat and the pressure inside the container main part (A) increases, as the steam pushes up the cover (2) through the gas discharging holes (5), the cover (2) falls off around the gas discharging holes (5) and excessive gas is discharged outside to reduce the pressure inside the container (C), and therefore, it is possible to continuously heat with the lid (B) staying.
  • the tongue-like protrusion (4) which is at the other end with respect to the gas discharging holes (5), the cover (2) remains adhered to the base (1).
  • the container (C) is taken out from the microwave oven and the tongue-like protrusion (4) is pulled with fingers in a peel-off direction, whereby the lid (B) is removed from the container main part (A).
  • the tongue-like protrusion (4) is at a position away from the gas discharging holes (5), the steam discharged through the gas discharging holes (5) does not heat up the tongue-like protrusion (4), and therefore, it is easy to remove the lid (B).
  • Fig. 6 is an appearance view showing some features of an embodiment of the packaging material according to the first invention, while Fig. 7 is a partially enlarged cross sectional view along a Z-Z' line in Fig. 6.
  • a packing bag (D) formed by the packaging material according to the first invention comprises a base (1) of polypropylene having a thickness of 30 ⁇ m and a cover (2) which is obtained by stacking an aluminum foil (2a) having a thickness of 7 ⁇ m and polypropylene (2b) having a thickness of 40 ⁇ m one atop the other, such that the base (1) and the cover (2) are adhered to each other using an adhesive agent which contains polyethylene at an adhesive strength of 490cN/15mm (500gf/15mm) at an ordinary temperature (20°C).
  • Gas discharging holes (5) are formed in the base (1) at six positions, and the gas discharging holes (5) are covered with and completely sealed up with the cover (2).
  • the packaging material is bent into the shape of a bag, bonding is executed at a horizontal seal portion (10) and a vertical seal portion (12), beverage and/or food which generates gas during preservation is filled in through an open horizontal seal portion (11), and bonding is executed at the horizontal seal portion (11) at last, whereby the packing bag (D) is created.
  • the seal portions (10), (11) and (12) are bonded with an adhesive agent which contains polypropylene, at an adhesive strength of 1960 cN/15mm (2000gf/15mm) at an ordinary temperature (20°C).
  • Fig. 8 is a perspective appearance view showing some features of an embodiment of the container according to the second invention, while Fig. 9 is a partially enlarged cross sectional view along a V-V' line in Fig. 8.
  • a lid (B) is adhered to a flange (7) of a container main part (A) at an adhesive strength of 980cN/15mm (1000gf/15mm) at an ordinary temperature (20°C).
  • the lid (B) comprises a base (1) and a cover (2), and the base (1) and the cover (2) are adhered to each other using an adhesive agent which contains polyethylene at an adhesave strength of 245cN/15mm (250gf/15mm) at an ordinary temperature (20°C).
  • the tongue-like protrusion (4) is an extension of the base (1).
  • the lid (B) has a circular shape which is approximately the same as that of the flange (7) of the container main part (A).
  • a gas discharging hole (5) is formed in the base (1), and further, a second gas discharging hole (8) is formed in the cover (2) at a position in the vicinity of the gas discharging hole (5).
  • the pressure inside the container (C) increases, excessive gas pushes up the cover (2) through the gas discharging hole (5), and the cover (2) is peeled off from the base (1).
  • the peeling off links inside the container (C) with outside the container (C) through the second gas discharging hole (8), whereby the excessive gas is discharged and the pressure inside the container (C) drops.
  • Fig. 10 is a perspective appearance view showing a function of the tongue-like protrusion.
  • the container main part (A) is coated with an over cap (E) for protecting the lid (B)
  • the tongue-like protrusion (4) is soft, an operation of coating with the over cap (E) is easily carried out
  • Fig. 11 is an appearance view of a packing bag, which shows some features of another embodiment of the packaging material according to the first invention
  • Fig. 12 is a partially enlarged cross sectional view along a W-W' line in Fig. 11.
  • the packing bag (F) is formed by a similar material to have a similar structure to the packing bag (D) described in relation to the embodiment 2 above (See Fig. 6.). Further, in the packing bag (F), as shown in Fig. 12, gas discharging holes (5) are formed in the base (1), and the gas discharging holes (5) are covered with and completely sealed up with a cover (2).
  • second gas discharging holes (8) are formed in the vicinity of the gas discharging holes (5).
  • Figs. 13 and 14 are a front surface view and a back surface view, respectively, of a lid of a container, which shows some features of an embodiment of the packaging material according to the first invention.
  • Figs. 15 and 16 are partially enlarged cross sectional views along an X-X' line and Y-Y' line, respectively, in Fig. 13.
  • Fig. 17 is a partial cross sectional view of the container which is sealed with the lid.
  • the lid (B) formed by the packaging material according to the first invention comprises a base (1) of polyethylene terephthalate (PET) having a thickness of 42 ⁇ m and a cover (2) which is obtained by stacking a PET layer (2a) having a thickness of 12 ⁇ m and a paper layer (2b) having a thickness of 90 ⁇ m one atop the other.
  • a tongue-like protrusion (4) for firm holding is formed at one end of the base (1)
  • two gas discharging holes (5) are formed at an end which is approximately opposite to the tongue-like protrusion (4) (i.e., at the other end), and the gas discharging holes (5) are covered with and completely sealed up with a cover (2).
  • gas discharging paths (9) are formed in the lid (B) from the gas discharging holes (5) to a brim of the lid.
  • the base (1) and the cover (2) are adhered to each other except at the gas discharging paths (9) with an adhesive agent which contains polyethylene at an adhesive strength of 980cN/15mm (1000gf/15mm) at an ordinary temperature (20°C).
  • the base (1) and the cover (2) are adhered to each other at an adhesive strength of 980cN/15mm (100gf/15mm) which is 10 % of the adhesive strength between the base (1) and the cover (2) in the other portion.
  • the lid (B), after beverage and/or food is filled in, is adhered to a flange (7) of a container main part (A: See Fig. 17.) with an adhesive agent (6) which contains polypropylene at an adhesive strength of 1470cN/15mm (1500gf/15mm) at an ordinary temperature (20°C).
  • the container (C) as it is is microwaved without partially or entirely opening the lid (B).
  • the beverage and/or food generates steam due to heat and the pressure inside the container main part (A) increases, as the steam pushes up the cover (2) through the gas discharging holes (5) at the gas discharging paths (9) whose adhesion strength is weak, whereby the gas discharging paths (9) is opened through from the gas discharging holes (5) to the brim of the lid.
  • the container (C) is taken out from the microwave oven and the tongue-like protrusion (4) is pulled with fingers in a peel-off direction, whereby the lid (B) is removed from the container main part (A).
  • the tongue-like protrusion (4) is at a position away from the gas discharging holes (5), the steam discharged through the gas discharging holes (5) does not heat up the tongue-like protrusion (4), and therefore, it is easy to remove the lid (B).
  • Fig. 18 is an appearance view showing some features of another embodiment of the packaging material according to the first invention
  • Fig. 19 is a partially enlarged cross sectional view along a Z-Z' line in Fig. 18.
  • a packing bag (D) formed by the packaging material according to the first invention comprises a base (1) of polypropylene having a thickness of 30 ⁇ m and a cover (2) which is obtained by stacking an aluminum foil (2a) having a thickness of 7 ⁇ m and polypropylene (2b) having a thickness of 40 ⁇ m one atop the other.
  • Gas discharging holes (5) are formed in the base (1) at six positions, and the gas discharging holes (5) are covered with and completely sealed up with the cover (2). Further, gas discharging paths (9) are formed from the gas discharging holes (5) of the base (1) to edge portions of the packing materials which are in the vicinity of the gas discharging holes (5).
  • the base (1) and the cover (2) are adhered to each other except at the gas discharging paths (9) with an adhesive agent (3) which contains polyethylene at an adhesive strength of 980 cN/15mm (1000gf/15mm) at an ordinary temperature (20°C).
  • an adhesive agent (3) which contains polyethylene at an adhesive strength of 980 cN/15mm (1000gf/15mm) at an ordinary temperature (20°C).
  • the base (1) and the cover (2) are adhered to each other at an adhesive strength of 98cN/15mm (100gf/15mm) which is 10 % of the adhesive strength between the base (1) and the cover (2) in the other portion.
  • the packing material is bent into the shape of a bag, bonding is executed at a horizontal seal portion (10) and a vertical seal portion (12), beverage and/or food which generates gas during preservation is filled in through an open horizontal seal portion (11), and bonding is executed at the horizontal seal portion (11) at last, whereby the packing bag (D) is created.
  • the gas discharging paths (9) communicate with outside at the respective seal portions (10), (11) and (12).
  • the base (1) is adhered to itself with an adhesive agent (6) which contains polypropylene at an adhesive strength of 1470 cN/15mm (1500gf/15mm)/ 15mm at an ordinary temperature (20°C).
  • Fig. 20 is a perspective appearance view showing some features of an embodiment of the container according to the second invention
  • Fig. 21 is a partially enlarged cross sectional view along a V-V' line in Fig. 20.
  • the lid (B) is, after beverage and/or food is filled in, adhered to a flange (7) of a container main part (A) at an adhesive strength of 1470cN/15mm (1500gf/15mm) 15mm at an ordinary temperature (20°C).
  • the lid (B) comprises a base (1) and a cover (2). While a tongue-like protrusion (4) for firm holding is formed at one end of the lid (B), the tongue-like protrusion (4) is an extension of the base (1).
  • the base cover (2) has a circular shape which is approximately the same as that of the flange (7) of the container main part (A).
  • a gas discharging hole (5) is formed in the base (1), and further, a second gas discharging hole (8) is formed in the cover (2) at a position in the vicinity. Further, a gas discharging path (9) is formed between the gas discharging hole (5) and the second gas discharging hole (8) of the gas discharging hole (5).
  • the base (1) and the cover (2) are adhered to each other except at the gas discharging path (9) with an adhesive agent which contains polyethylene at an adhesive strength of 980cN/15mm (1000gf/15mm) at an ordinary temperature (20°C).
  • the gas discharging path (9) is adhered at an adhesive strength of 98cN/15mm (100gf/15mm).
  • the pressure inside the container (C) increases, excessive gas pushes up the cover (2) through the gas discharging hole (5), and the cover (2) is peeled off from the base (1) at the gas discharging path (9) whose adhesion strength is weak
  • the peeling off links inside the container (C) with outside the container (C) through the second gas discharging holes (8), so that excessive gas is discharged and the pressure inside the container (C) drops.
  • the tongue-like protrusion (4) is merely an extension of the base (1), the tongue-like protrusion (4) is softer than one which is an extension of an entire layer, and therefore, can be easily bent Hence, where the container main part (A) is coated with an over cap (not shown) for protecting the lid (B), the tongue-like protrusion (4) is easily bent, which allows to smoothly coat with the over cap.
  • Fig. 22 is an appearance view of a packing bag, which shows some features of another embodiment of the packaging material according to the first invention.
  • the packing bag (F) is formed by a similar material to have a similar structure to the packing bag (D) described in relation to the embodiment 6 (See Figs. 18 and 19.). Further, in the packing bag (F), as in the embodiment 6 above, gas discharging holes (5) are formed in the base (1), and the gas discharging holes (5) are covered with and completely sealed up with a cover (2). As in the embodiment 6 described above, gas discharging paths (9) are formed in the packing bag (F).
  • second gas discharging holes (8) which are formed in the vicinity of the gas discharging holes (5), and the gas discharging paths (9) are formed from the gas discharging holes (5) to the second gas discharging holes (8).
  • Figs. 23 and 24 are back surface views of lids which are used for the container according to the second invention.
  • the reclosing prevention pieces (13) are adhered to a cover (not shown) in a normal condition, when beverage and/or food in a container generates steam due to heat to thereby cause peeling off of the cover at a gas discharging path (9) and blowing out of the steam through the gas discharging hole (5), the four reclosing prevention pieces (13) are heated up, deformed due to the pressure of the blowing gas and kept standing. After heating, since the reclosing prevention pieces (13) prevent the cover from adhering to the base (1) once again, it is possible to prevent closing of the gas discharging hole (5), and hence, deformation of the container due to a reduction in the pressure within the container.
  • reclosing prevention pieces (13) as such may be disposed to the lid of the container according to the second invention which is described by way of example in the embodiments 1 and 3.
  • Fig. 25 is a back surface view showing another aspect of a lid which is used for the container according to the second invention.
  • a plurality of x-letter like reclosing prevention cuts (14) are formed around a gas discharging hole (5) of a base (1).
  • these cuts (14) are normally coated with a cover, when beverage and/or food in a container generates excessive gas due to heat and the cover is peeled off at a gas discharging paths (9), steam blows out through the four reclosing prevention cuts (14) as well to heat up the cuts, so that the cuts are deformed by the pressure of the blowing gas and kept standing. After heating, since the reclosing prevention cuts (14) prevent the cover from adhering to the base (1) once again, it is possible to prevent closing of the gas discharging hole (5), and hence, deformation of the container due to a reduction in the pressure within the container.
  • Fig. 25 shows that the cuts (14) are formed only in the range of the gas discharging paths (9), the cuts (14) may be formed in the entire surface of the base (1). That is, whether there are the cuts (14) or not does not matter since the cover is not peeled off other than at the gas discharging paths (9). Forming the cuts (14) in the entire surface of the base (1) in advance is easier in terms of processing and demands less cost for production.
  • the lid may be used as the lid of the container according to the second invention which is described in the embodiments 1 and 4.
  • Fig. 26 is a perspective appearance view showing still other some features of an embodiment of a lid which is used for the container according to the second invention
  • Fig. 27 is a partially enlarged cross sectional view along a U-U' line in Fig. 26.
  • the lid (B) is formed by a similar material to have a similar structure to the lids (B) which are shown in Figs. 13 through 17.
  • a gas discharging hole (5) is formed approximately at a central portion of a base (1) of the lid (B), a cover (2) is adhered to an entire surface of the base (1).
  • a plurality of second gas discharging holes (8) are formed in the cover (2), and a gas discharging paths (9) is formed in a range linking the gas discharging hole (5) with the second gas discharging holes (8).
  • the lid (B) is adhered to a flange (7) of a container main part (A), in which beverage and/or food (L in Fig. 27) is filled, at an adhesive strength of 1470 cN/15mm (1500gf/15mm) at an ordinary temperature (20°C).
  • a step (15) is formed in a lower portion of the flange (7) of the container main part (A).
  • step (15) is disposed to the container main part (A) in the container (C)
  • an aluminum foil layer (16) which blocks a microwave is formed at the step (15).
  • the aluminum foil layer (16) is disposed to cover a portion (L2) where a top surface (L1) of beverage and/or food (L) which is filled in the container main part
  • the aluminum foil layer (16), the heat insulation layer (17) and the coating layer (18) of the container (C) according to the present embodiment are applicable to the container according to the second invention which is described in the embodiments 1 and 3.
  • the boiling-over prevention ensured by the aluminum foil layer (16), in particular, is effective in the container according to the second invention wherein the cover is peeled off widely.
  • the packaging materials described in the present application are usable as a lid for sealing off a container which is filled with beverage and/or food which is to be microwaved or otherwise appropriately heated for drinking and/or eating, and a packing bag which is formed in the shape of a bag, a tube or the like for packaging of beverage and/or food.
  • the containers for sealing beverage and/or food described in the present application are containers for beverage and/or food which is to be microwaved or otherwise appropriately heated for drinking and/or eating.
  • the containers do not require a hole to be opened or bored prior to heating, and therefore, a risk of heat-induced boiling over or the like is extremely small.
  • the containers have a particularly excellent availability as containers for automatic vending machines which are equipped with heating means. Sale of beverage and/or food via such automatic vending machines can facilitate suppression of a labor cost, saving of energy, a reduction in a floor space of a store or other advantages, and hence, contribute to creation of a new sales channel for beverage and/or food.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Food Science & Technology (AREA)
  • Package Specialized In Special Use (AREA)

Claims (12)

  1. Verpackungsmaterial, umfassend:
    ein gasundurchlässiges Substrat (1), das ein Gasaustrittsloch (5) enthält; und
    eine gasundurchlässige Abdeckung (2), die an einer Oberfläche des Substrats (1) geklebt ist, um das Gasaustrittsloch (5) zu bedecken,
       wobei die Abdeckung (2) an dem Substrat (1) mit einer Haftfestigkeit geklebt ist, die ermöglicht, dass mindestens ein Teil der Abdeckung (2) abgeschält wird, wenn Überdruck, der durch Getränk und/oder Nahrungsmittel erzeugt wird, das durch das Verpackungsmaterial umschlossen wird, auf die Abdeckung durch das Gasaustrittsloch wirkt, um dadurch den Überdruck abzubauen,
       dadurch gekennzeichnet, dass
       das Gasaustrittsloch (5) einen Wiederverschlussverhütungseinschnitt (13) an einem peripheren Rand des Lochs (5) umfasst
       und/oder
       das gasundurchlässige Substrat (1) eine oder mehrere andere Wiederverschlussverhütungseinschnitte (14) als an dem Gasaustrittsloch (5) umfasst;
       und wobei durch die Einschnitte (13, 14) gebildete Stücke aufgrund von Überdruck erwärmt und verformt werden können, um die Abdeckung (2) daran zu hindern, das Gasaustrittslochs (5) wieder zu verschließen.
  2. Verpackungsmaterial nach Anspruch 1, bei dem die Haftfestigkeit zwischen dem Substrat und der Abdeckung 98 cN/15 mm - 1618 cN/15 mm (100 gf/15 mm - 1650 gf/15 mm) beträgt.
  3. Verpackungsmaterial nach Anspruch 1 oder 2, bei dem die Abdeckung (2) ein zweites Gasaustrittsloch (8) umfasst und das zweite Gasaustrittsloch (8) an einer Position gebildet ist, die das Gasaustrittsloch (5) des Substrats (1) nicht überlagert.
  4. Verpackungsmaterial nach Anspruch 1, bei dem nur ein Teil der gasundurchlässigen Abdeckung (2), die an einer Oberfläche des Substrats (1) geklebt ist, um das Gasaustrittsloch (5) zu bedecken, an dem Substrat (1) mit einer Haftfestigkeit geklebt ist, die ermöglicht, dass der Teil der Abdeckung (2) abgeschält wird, wenn Überdruck, der von Getränk und/oder Nahrungsmittel erzeugt wird, das durch das Verpackungsmaterial umschlossen wird, auf den Teil der Abdeckung (2) durch das Gasaustrittsloch (5) wirkt, so dass ein Gasaustrittspfad gebildet wird, der das Gasaustrittsloch (5) mit einer Außenseite des Verpackungsmaterials verbindet, um den Überdruck abzubauen, wobei der Teil der Abdeckung (2) das Gasaustrittsloch (5) und die Wiederverschlussverhütungseinschnitte (13, 14) bedeckt.
  5. Verpackungsmaterial nach Anspruch 4, bei dem der Gasaustrittspfad (9) gebildet wird, wenn das Substrat (1) und der Teil der Abdeckung (2) mit einer Haftfestigkeit von 49 cN/15 mm - 784 cN/15 mm (50 gf/15 mm -800 gf/15 mm) aneinander geklebt werden.
  6. Verpackungsmaterial nach Anspruch 4 oder Anspruch 5, bei dem die Abdeckung (2) ein zweites Gasaustrittsloch (8) an einer Position umfasst, die das Gasaustrittsloch (5) des Substrats (1) nicht überlagert, und der Gasaustrittspfad (9) zwischen dem Gasaustrittsloch (5) und dem zweiten Gasaustrittsloch (8) gebildet wird.
  7. Behälter (C) zum Abdichten von Getränk und/oder Nahrungsmittel, umfassend:
    einen Behälterhauptteil (A), der für Mikrowellen durchlässig ist; und
    einen Deckel (B), der den Behälterhauptteil absperrt,
       wobei der Deckel ein Verpackungsmaterial von einem der Ansprüche 1 bis 6 umfasst.
  8. Behälter (C) nach Anspruch 7, bei dem der Deckel (B) einen zungenartigen Vorsprung (4) umfasst.
  9. Behälter nach Anspruch 8, bei dem der zungenartige Vorsprung (4) durch Verlängern des Substrats (1) gebildet ist.
  10. Behälter (C) nach Anspruch 8 oder 9, abhängig von Anspruch 3 oder Anspruch 6, bei dem das zweite Gasaustrittsloch (8) an einer Position gebildet ist, die zu dem zungenartigen Vorsprung (4) entgegengesetzt ist.
  11. Behälter (C) nach Anspruch 8 oder 9, bei dem der zungenartige Vorsprung (4) an einem Teil gebildet ist, der zu einem hinteren Ende des Gasaustrittspfads (9) entgegengesetzt ist.
  12. Behälter (C) nach einem der Ansprüche 7 bis 11, bei dem der Behälterhauptteil (A) eine Mikrowellenabschirmschicht (16) in einem Seitenoberflächenteil umfasst und die Mikrowellenabschirmschicht (16) so angeordnet ist, dass ein Teil (12) bedeckt wird, in dem eine oberste Fläche des abgedichteten Getränks und/oder Nahrungsmittels (L1) den Behälterhauptteil (A) berührt.
EP99922496A 1998-05-27 1999-05-26 Verpackungsmaterial sowie behälter zur aufnahme von getränken und nahrungsmitteln Expired - Lifetime EP1122189B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DK99922496T DK1122189T3 (da) 1998-05-27 1999-05-26 Emballeringsmateriale og beholder til forsegling af drikkevare og födevare

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
JP16300398 1998-05-27
JP16300398 1998-05-27
JP18563198 1998-06-16
JP18563198 1998-06-16
JP35394698 1998-11-27
JP35394698 1998-11-27
PCT/JP1999/002768 WO1999061346A1 (fr) 1998-05-27 1999-05-26 Materiau d'emballage et contenant destine a conditionner des boissons et des aliments

Publications (3)

Publication Number Publication Date
EP1122189A1 EP1122189A1 (de) 2001-08-08
EP1122189A4 EP1122189A4 (de) 2002-05-22
EP1122189B1 true EP1122189B1 (de) 2004-08-18

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Country Link
EP (1) EP1122189B1 (de)
DE (1) DE69919561T2 (de)
DK (1) DK1122189T3 (de)
WO (1) WO1999061346A1 (de)

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EP1357054B1 (de) * 2002-04-23 2005-09-14 Wipf AG Mikrowellentaugliche Lebensmittelverpackung mit peelfähiger Deckelfolie und Druckventil
US20050233035A1 (en) * 2002-07-05 2005-10-20 Burrall Limited Microwavable food package having a venting valve
EP1422163A1 (de) * 2002-11-22 2004-05-26 Amcor Flexibles Europe A/S Lebensmittelverpackung zur Erwärmung in einem Ofen
EP1481911A1 (de) * 2003-05-26 2004-12-01 P.L.V. Spa Überdruckventil für Behälter für pulverförmige Produkte
JP4911030B2 (ja) 2005-08-16 2012-04-04 東洋製罐株式会社 電子レンジ調理用包装容器
JP2007062834A (ja) * 2005-09-02 2007-03-15 Toyo Seikan Kaisha Ltd 電子レンジ用容器
JP4703472B2 (ja) * 2006-04-14 2011-06-15 出光ユニテック株式会社 包装容器
JP4943804B2 (ja) * 2006-10-16 2012-05-30 ハウス食品株式会社 電子レンジ調理用容器及びその製造方法
EP2070837B1 (de) 2007-12-14 2013-09-25 SEDA S.p.A. Mehrschichtfolie für eine Mikrowellenverpackung, Mikrowellenverpackung die eine solche Mehrschichtfolie verwendet und Verfahren zu deren Herstellung
GB2462995B (en) * 2008-09-02 2012-11-14 Excelsior Technologies Ltd Improved food packaging for use in microwave ovens
JP6031796B2 (ja) * 2012-03-30 2016-11-24 凸版印刷株式会社 蒸気抜き機能を有する蓋材
JP5965747B2 (ja) * 2012-06-29 2016-08-10 株式会社吉野工業所 加熱容器
US9199781B2 (en) * 2013-03-14 2015-12-01 Sonoco Development, Inc. Hermetic microwavable package with automatically opening steam vent
JP6265862B2 (ja) * 2013-09-17 2018-01-24 株式会社パックス 包装容器およびその製造方法
GB2537811B (en) 2015-03-26 2017-07-05 Parkside Flexibles (Europe) Ltd Package
JP2017158850A (ja) * 2016-03-10 2017-09-14 東洋製罐グループホールディングス株式会社 加熱用パッケージおよび包装体
WO2018096681A1 (ja) * 2016-11-28 2018-05-31 中央化学株式会社 食品用包装容器とその製造方法
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Also Published As

Publication number Publication date
DE69919561T2 (de) 2005-09-08
EP1122189A1 (de) 2001-08-08
WO1999061346A1 (fr) 1999-12-02
DK1122189T3 (da) 2004-11-22
DE69919561D1 (de) 2004-09-23
EP1122189A4 (de) 2002-05-22

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