EP1127810B1 - Lebensmittelbehälter mit Entlüftung - Google Patents

Lebensmittelbehälter mit Entlüftung Download PDF

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Publication number
EP1127810B1
EP1127810B1 EP01300620A EP01300620A EP1127810B1 EP 1127810 B1 EP1127810 B1 EP 1127810B1 EP 01300620 A EP01300620 A EP 01300620A EP 01300620 A EP01300620 A EP 01300620A EP 1127810 B1 EP1127810 B1 EP 1127810B1
Authority
EP
European Patent Office
Prior art keywords
container
hole
food
sealing sheet
vent 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
EP01300620A
Other languages
English (en)
French (fr)
Other versions
EP1127810A3 (de
EP1127810A2 (de
Inventor
Sachiko Hiyoshi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zac KK
Original Assignee
Zac KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zac KK filed Critical Zac KK
Publication of EP1127810A2 publication Critical patent/EP1127810A2/de
Publication of EP1127810A3 publication Critical patent/EP1127810A3/de
Application granted granted Critical
Publication of EP1127810B1 publication Critical patent/EP1127810B1/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
    • 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
    • B65D2205/02—Venting holes

Definitions

  • the present invention relates to a packaged food which is produced by enclosing unfrozen or frozen food in an airtight container such that the packaged food can be directly cooked by heating in a microwave oven.
  • the present invention also relates to a container for packaging food in which the aforementioned food can be enclosed for storage.
  • Packaged food produced by enclosing unfrozen food (i.e, food at the rom temperature) or frozen food in a container for storage is conventionally known. It is also known that, when such packaged food is heated in a microwave oven, the pressure inside the package significantly rises up, to increase the possibility of the package exploding. Therefore, it has been proposed a technique for preventing explosion, in which holes are formed in the container for packaging food such that each hole is covered by a circular-shaped sealing piece coated with an adhesive (Japanese Utility Model 62-69466).
  • the present invention intends to provide, in an economical manner, a sealing structure in which a hole-sealing sheet for sealing a vent hole formed in a container for packaging food automatically comes off, at the most preferable timing, when the food is cooked by heating by an microwave oven.
  • a first object of the present invention is to provide a packaged food, in which a hole-sealing sheet covering a vent hole formed at a portion of a container is not so easily peeled off when the container is preserved at the room temperature or the freezing condition but the hole-sealing sheet automatically comes off, when the food is heated by an microwave oven, substantially at the time when the food contained in the container has reached an adequately cooked state.
  • a second object of the present invention is to provide a container for packaging food, which container is provided with at least one vent hole and used for producing packaged food by enclosing food therein, and in which container a hole-sealing sheet covering the vent hole is not so easily peeled off when the container is preserved at the room temperature or the freezing condition but the hole-sealing sheet automatically comes off, when the food is heated by an microwave oven, substantially at the time when the food contained in the container has reached an adequately cooked state. That is, the second object of the present invention is to provide a container for packaging food which enables carrying out the most preferable heating of the food by flexibly adapting, in function thereof, to the various heating conditions by a microwave oven which is selected according to the contained food.
  • the container for packaging food of the present invention which can achieve the aforementioned second object, is characterized in that the container has, on one side thereof, a surface portion made of plastic sheet, at least one vent hole formed in the vicinity of the center of the surface portion, the vent hole being sealed by an adhesive hole-sealing sheet made of white chemical paper used as a base material whose vertical peeling strength is no less that 1 N/cm at the temperature range of 40°C or lower and is no higher than 0.1 N/cm at the temperature range of 80°C or higher.
  • the hole sealing sheet is adhered to the surface portion by an adhesive layer, said adhesive layer being formed of a blend of styrene-butadiene-based rubber and/or acryl-based rubber with a resin-based or petroleum resin-based adhesion additive. It is preferable that the vent hole formed in the container is sealed by the hole-sealing sheet such that the adhesive layer having uneven width provided in the hole-sealing sheet covers the periphery of the vent hole.
  • Packaged food of the present invention is intended to represent packaged food which can be cooked by heating by a microwave oven.
  • At least one vent hole is provided in a container for packaging food so that, when the pressure inside the container is increased in heating the food due to volume increase in the air in the container and generation of steam, the increased pressure is reduced by releasing the steam and occurrence of explosion is prevented.
  • the vent hole is sealed by a hole-sealing sheet having adhesives thereon. That is, the present invention has been achieved by utilizing and improving the conventional technique.
  • the inventors of the present invention have assiduously studied a problem that it is not easy to make the preferable finished state of cooking by heating correspond with the pressure resistance properties of the hole-sealing sheet.
  • the inventors have discovered that the pressure resistance properties of the hole-sealing sheet can be changed by adjusting the temperature properties of adhesive strength of the adhesive agent (the adhesive agent is used for attaching the hole-sealing sheet).
  • the present invention has been achieved on the basis of this discovery.
  • the container for packaging food of the present invention may have a box-like shape or a bag-like shape. That is, the shape of the container is not limited to any particular form and any structure is acceptable as long as the container is formed by using a material which is excellent in airtight, watertight, oil resistant and heat resistant properties, is electromagnetic wave-transmittable, and has mechanical strength of appropriate level. However, at least one side surface of the container must be formed by a plastic sheet. The surface formed by a plastic sheet is preferably transparent so that the content therein can be seen.
  • plastic material to be used for forming the container as described above examples include: a single material sheet or a composite material sheet containing, as main components, polypropylene, polyester, polysulfone, polyamide (nylon), polycarbonate and the like; and a laminated layer-composite sheet in which the aforementioned single material or composite material sheet is combined with polyacrylate, polyvinylidene chloride, polyvinyl alcohol and the like.
  • a vent hole is formed in the plastic sheet surface made of the aforementioned materials.
  • the vent hole is preferably formed in the vicinity of the center of the container for packaging food (in the vicinity of the center of the upper surface, in a case of a flat-type container in which the height is relatively small as compared with the longitudinal/lateral dimensions thereof) in terms of evenly heating the content in the container.
  • the vent hole may have any shape such as circular, ellipsoidal, oval or polygonal shape, as long as the shape is suitable for the purpose.
  • the size of the diameter of the vent hole is preferably 5 mm or so, but is not particularly limited.
  • the hole-sealing sheet for sealing the vent hole is made of a base material having excellent airtight, watertight, oil resistance and heat resistance properties. It is preferable that the hole-sealing sheet itself hardly generates heat when it is hit by electromicrowaves nor increases its temperature when it absorbs infrared light.
  • the hole-sealing sheet may have any suitable shape such as circular or ellipsoidal shape.
  • the size of the diameter of the hole-sealing sheet is preferably 10 mm or so, but it not limited to this size.
  • the adhesive agent for attaching the hole-sealing sheet to the vent hole formed in the plastic sheet must be an adhesive agent having stickiness with respect to the plastic sheet, i.e., a pressure sensitive adhesive.
  • a pressure sensitive adhesive is produced by blending styrene butadiene-based rubber and acryl-based rubber with a resin-based or petroleum resin-based stickiness providing material so as to have both excellent pressure sensitive properties and excellent thermosensitive properties.
  • the pressure sensitive adhesive as described above is required to have thermosensitive properties in which the vertical peeling strength is no less than 1 N/cm or preferably no less than 2 N/cm in the temperature range of 40°C or lower and is no higher than 0.1 N/cm in the temperature range of 80°C or higher.
  • the numerical values in the aforementioned conditions are not such numerical values which are inherent to the adhesive itself as is obtained by measurement in accordance with the standard adhesive strength testing method and the like practiced in the industry (described in JIS Z 0237, for example), but the numerical values which indicate the thermosensitive properties of adhesive strength of the hole-sealing sheet, with respect to the plastic sheet of a container for packaging food having a vent hole formed therein. Accordingly, attention should be paid because it is generally not known whether or not a pressure sensitive adhesive, which satisfies the aforementioned conditions of adhesive strength properties with respect to a specific polyester sheet, also satisfies the conditions of adhesive strength properties with respect to a specific nylon 6 sheet.
  • the aforementioned conditions of adhesive properties are to be applied to a container for packaging food which is designed for accommodating the most common food, i.e., the food which contains water or aqueous solutions at appropriate ratios and is suitable for heating by an microwave oven.
  • the most common food include cooked food such as main meal, snack, half-cooked food and the like. Therefore, with respect to the food which needs to be heated to a relatively high temperature of no lower than 100°C or the food which needs to be heated only to 40-60°C, it is necessary that a pressure sensitive adhesive having more preferable adhesive strength properties within the aforementioned range of the conditions, is selected. Yet further, needless to say, food which is not suitable for being heated by an microwave oven such as dry foods or the like is beyond the scope of the present invention.
  • the reference number 1 represents a food container which is produced by molding a polycarbonate sheet. Alaminate layer or the like formed by an appropriate material may be provided inside the food container 1.
  • the reference number 2 represents a flexible lid made of nylon 6 sheet. The periphery portion of the lid 2 is designed so that the periphery portion can be fixed to the edge portion 1' of the food container 1 by melt-attaching or adhesive-attaching.
  • a vent hole 3 having circular shape is formed in the vicinity of the center position of the lid 2. The vent hole 3 has been airtightly sealed by the hole-sealing sheet 4 having circular shape.
  • a pressure sensitive adhesive layer 5 which sticks to the nylon 6 sheet is provided on the back surface of the hole-sealing sheet 4, such that a non-adhesive portion 5' having ellipsoidal shape is formed substantially in the center portion of the pressure sensitive adhesive layer 5.
  • the width of the portion coated with the pressure sensitive adhesive is made uneven.
  • the center position of the vent hole 3 does not need to coincide with that of the hole-sealing sheet 4.
  • a slight misalignment of 1-2 mm or so between the center position of the vent hole 3 and that of the center position of the hole-sealing sheet 4 is rather preferable because such a slight misalignment facilitates, in a reliable manner, peeling of the hole-sealing sheet 4.
  • the hole-sealing sheet 4 used here is produced by: preparing, as a base material, synthetic paper made of polyester which has thickness of 60 ⁇ m and white surface coating applied thereon; and coating the base material with an acryl-based pressure sensitive adhesive a so that the thickness of the adhesive a is 25 ⁇ m, thereby forming the pressure sensitive adhesive layer 5.
  • a hole-sealing sheet 4b and a hole-sealing sheet 4c were produced by coating the base material with another acryl-based pressure sensitive adhesive b or a styrene butadiene-based pressure sensitive adhesive c, respectively, so that the thickness of the adhesives b, c is each 25 ⁇ m and the pressure sensitive adhesive layer is formed in each of a hole-sealing sheet 4b and a hole-sealing sheet 4c in a manner similar to the hole-sealing sheet 4a.
  • the hole-sealing sheet 4a, the hole-sealing sheet 4b and the hole-sealing sheet 4c produced by coating the base material with the pressure sensitive adhesives a, the pressure sensitive adhesives b, the pressure sensitive adhesives c, respectively, were each pressingly attached to the vent hole 3 of the lid 2 made of nylon 6 sheet of a food container so as to seal the vent hole 3 (the three food containers for the three adhesives used here had substantially the same structure except for the hole-sealing sheet), thereby producing a container for packaging food A of the present invention and containers for packaging food B, C as comparative examples. Five samples were prepared for each of the container for packaging food A, Band C.
  • the packaged food of the present invention prepared by using the container for packaging food of the present invention reliably prevents, when the packaged food is heated by a microwave oven, the hole-sealing sheet thereof from peeling off at the time when the food has not sufficiently been heated.
  • the hole-sealing sheet peels off only when the food has reached an adequately cooked state, an enough amount of steam is generated and, due to the steam, the temperature at the vent hole portion has reached the temperature at which the pressure sensitive adhesive peels off. Therefore, by stopping the operation of the microwave oven when the steam has burst, there is no possibility of overheating the food.
  • the packaged food of the present invention is produced by enclosing food containing water or an aqueous solution in the container for packaging food of the present invention, the container for packaging food having, on one side thereof, a surface portion made of plastic sheet, at least one vent hole being formed in the vicinity of the center of the surface portion, the vent hole being sealed by an adhesive hole-sealing sheet whose vertical peeling strength is no less than 1 N/cm in the temperature range of 40°C or lower and is no higher than 0.1 N/cm at the temperature range of 80°C or higher.
  • the hole-sealing sheet thereof automatically peels off after the food has been sufficiently heated.
  • the present invention achieves an excellent effect that adequately cooked food can be easily obtained.

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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)
  • Packages (AREA)

Claims (7)

  1. Behälter (1) zum Verpacken von Nahrungsmittel, Wasser oder wässriger Lösung, wobei der Behälter (1) einen Oberflächenabschnitt (2) aufweist, der aus Kunststofffolie hergestellt ist, wobei mindestens ein Entlüftungsloch (3) in dem Oberflächenabschnitt gebildet ist, wobei das Entlüftungsloch durch eine Lochsiegelungsfolie (4) versiegelt ist, die an den Oberflächenabschnitt (2) durch eine Klebstoffschicht (5) geklebt ist, dadurch gekennzeichnet, dass die Lochsiegelungsfolie aus weißem chemischem Papier hergestellt ist, das als Basismaterial verwendet wird, die Klebstoffschicht aus einem Gemisch aus Kautschuk auf Styrol-Butadien-Basis und/oder Kautschuk auf Acrylbasis mit einem Adhäsionsadditiv auf Harzbasis oder Erdölharzbasis gebildet ist, das Entlüftungsloch durch die Lochsiegelungsfolie (4) versiegelt ist, deren vertikale Ablösefestigkeit im Temperaturbereich von 40 °C oder darunter nicht kleiner als 1 N/cm ist und im Temperaturbereich von 80 °C nicht höher als 0,1 N/cm ist.
  2. Behälter (1) zum Verpacken von Nahrungsmittel nach Anspruch 1, bei dem das mindestens eine Entlüftungsloch (3) in der Nähe der Mitte eines Oberflächenabschnitts (2) gebildet ist, der auf einer Seite des Behälters bereitgestellt wird.
  3. Behälter (1) nach Anspruch 1 oder Anspruch 2, bei dem die Klebstoffschicht (5) sich um den gesamten Rand des Entlüftungslochs (3) herum erstreckt und die Lochsiegelungsfolie (4) lediglich durch die Klebstoffschicht (5) an den Oberflächenabschnitt (2) geklebt ist.
  4. Behälter (1) zum Verpacken von Nahrungsmittel nach einem der Ansprüche 1 bis 3, bei dem die Klebstoffschicht (5) um den Rand des Entlüftungslochs (3) herum eine ungleichförmige Breite aufweist.
  5. Behälter (1) nach Anspruch 1, bei dem das Basismaterial Polyester umfasst.
  6. Behälter (1) nach einem der Ansprüche 1 bis 5, bei dem die Kunststofffolie Polyamid umfasst.
  7. Behälter nach einem der Ansprüche 1 bis 6, der wasserhaltiges Nahrungsmittel oder eine wässrige Lösung enthält.
EP01300620A 2000-02-01 2001-01-24 Lebensmittelbehälter mit Entlüftung Expired - Lifetime EP1127810B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000023830A JP3707977B2 (ja) 2000-02-01 2000-02-01 包装食品および包装食品用容器
JP2000023830 2000-02-01

Publications (3)

Publication Number Publication Date
EP1127810A2 EP1127810A2 (de) 2001-08-29
EP1127810A3 EP1127810A3 (de) 2001-09-05
EP1127810B1 true EP1127810B1 (de) 2003-12-17

Family

ID=18549929

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01300620A Expired - Lifetime EP1127810B1 (de) 2000-02-01 2001-01-24 Lebensmittelbehälter mit Entlüftung

Country Status (6)

Country Link
US (1) US20010012530A1 (de)
EP (1) EP1127810B1 (de)
JP (1) JP3707977B2 (de)
CN (1) CN1118424C (de)
DE (1) DE60101487T2 (de)
HK (1) HK1038542A1 (de)

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CN100564188C (zh) * 2002-11-20 2009-12-02 米克瓦科股份公司 食品包装方法和食品包装件

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Publication number Priority date Publication date Assignee Title
CN100564188C (zh) * 2002-11-20 2009-12-02 米克瓦科股份公司 食品包装方法和食品包装件

Also Published As

Publication number Publication date
EP1127810A3 (de) 2001-09-05
DE60101487D1 (de) 2004-01-29
EP1127810A2 (de) 2001-08-29
CN1309070A (zh) 2001-08-22
CN1118424C (zh) 2003-08-20
DE60101487T2 (de) 2004-06-09
JP2001213483A (ja) 2001-08-07
US20010012530A1 (en) 2001-08-09
JP3707977B2 (ja) 2005-10-19
HK1038542A1 (en) 2002-03-22

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