US20070071855A1 - Packaging container for microwave oven - Google Patents
Packaging container for microwave oven Download PDFInfo
- Publication number
- US20070071855A1 US20070071855A1 US11/604,685 US60468506A US2007071855A1 US 20070071855 A1 US20070071855 A1 US 20070071855A1 US 60468506 A US60468506 A US 60468506A US 2007071855 A1 US2007071855 A1 US 2007071855A1
- Authority
- US
- United States
- Prior art keywords
- microwave oven
- packaging container
- seal part
- container
- packaging
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 170
- 238000007789 sealing Methods 0.000 claims abstract description 26
- 239000002985 plastic film Substances 0.000 claims abstract description 16
- 229920006255 plastic film Polymers 0.000 claims abstract description 16
- 230000002093 peripheral effect Effects 0.000 claims description 19
- 238000007639 printing Methods 0.000 claims description 17
- 238000012856 packing Methods 0.000 claims description 6
- 238000004299 exfoliation Methods 0.000 claims description 5
- 230000002087 whitening effect Effects 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 18
- 239000000463 material Substances 0.000 abstract description 11
- 239000010410 layer Substances 0.000 description 28
- 229920005989 resin Polymers 0.000 description 13
- 239000011347 resin Substances 0.000 description 13
- 239000005022 packaging material Substances 0.000 description 12
- -1 polypropylene Polymers 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 229920005992 thermoplastic resin Polymers 0.000 description 10
- 239000004743 Polypropylene Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 239000011800 void material Substances 0.000 description 9
- 229920006284 nylon film Polymers 0.000 description 8
- 229920006267 polyester film Polymers 0.000 description 8
- 229920001155 polypropylene Polymers 0.000 description 8
- 238000010411 cooking Methods 0.000 description 7
- 229920003023 plastic Polymers 0.000 description 6
- 239000004033 plastic Substances 0.000 description 6
- 238000004040 coloring Methods 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 239000012790 adhesive layer Substances 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 4
- 239000005038 ethylene vinyl acetate Substances 0.000 description 4
- 235000013305 food Nutrition 0.000 description 4
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 4
- 229920000954 Polyglycolide Polymers 0.000 description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 description 3
- 229920002125 Sokalan® Polymers 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000004584 polyacrylic acid Substances 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 239000004633 polyglycolic acid Substances 0.000 description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 description 3
- 230000003449 preventive effect Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 2
- 229920002292 Nylon 6 Polymers 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 229920006244 ethylene-ethyl acrylate Polymers 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 229920001684 low density polyethylene Polymers 0.000 description 2
- 239000004702 low-density polyethylene Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920001179 medium density polyethylene Polymers 0.000 description 2
- 239000004701 medium-density polyethylene Substances 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 229920005672 polyolefin resin Polymers 0.000 description 2
- 229920006324 polyoxymethylene Polymers 0.000 description 2
- 229920005653 propylene-ethylene copolymer Polymers 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000010025 steaming Methods 0.000 description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OEPOKWHJYJXUGD-UHFFFAOYSA-N 2-(3-phenylmethoxyphenyl)-1,3-thiazole-4-carbaldehyde Chemical compound O=CC1=CSC(C=2C=C(OCC=3C=CC=CC=3)C=CC=2)=N1 OEPOKWHJYJXUGD-UHFFFAOYSA-N 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920001634 Copolyester Polymers 0.000 description 1
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 229930040373 Paraformaldehyde Natural products 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 description 1
- 229920001893 acrylonitrile styrene Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000004840 adhesive resin Substances 0.000 description 1
- 229920006223 adhesive resin Polymers 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
- 229920006164 aromatic vinyl copolymer Polymers 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 235000021438 curry Nutrition 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 239000005042 ethylene-ethyl acrylate Substances 0.000 description 1
- 239000000796 flavoring agent Substances 0.000 description 1
- 235000019634 flavors Nutrition 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 235000013611 frozen food Nutrition 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 229920000554 ionomer Polymers 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000004707 linear low-density polyethylene Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920001748 polybutylene Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920005673 polypropylene based resin Polymers 0.000 description 1
- 229920005606 polypropylene copolymer Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920000874 polytetramethylene terephthalate Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- SCUZVMOVTVSBLE-UHFFFAOYSA-N prop-2-enenitrile;styrene Chemical compound C=CC#N.C=CC1=CC=CC=C1 SCUZVMOVTVSBLE-UHFFFAOYSA-N 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 235000013547 stew Nutrition 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 231100000167 toxic agent Toxicity 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
Images
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
- B65D81/3453—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
- 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
- B65D2203/00—Decoration means, markings, information elements, contents indicators
- B65D2203/12—Audible, olfactory or visual signalling means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2205/00—Venting means
- B65D2205/02—Venting holes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2581/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D2581/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within
- B65D2581/3401—Cooking or heating method specially adapted to the contents of the package
- B65D2581/3436—Doneness indicators, e.g. to indicate whether the food is cooked
Abstract
A packaging container for a microwave oven. Completion of heating of the container contents and automatic opening of the container can be easily recognized. This can be achieved without requiring a special member and complex steps, but by processing wrapping materials constructing the packaging container. Also provided is a packaging container for a microwave oven, where danger, including spilling of the contents of the container and burning by touching an opening section occurring in heating by a microwave oven, can be avoided. Further provided is a packaging container for a microwave oven, sealed by heat-sealing plastic films and having a steam vent seal section having a weakened section. The steam vent seal section has mark emerging means, and when the steam vent seal section is separated and opened, the means shows different surface-and back face-wrapping materials constituting the steam vent seal section, enabling recognition of opening.
Description
- This application is a Continuation of Application Ser. No. 10/580,831 which is a 371 of PCT/JP2004/017278, filed Nov. 19, 2004, and which claims benefit of Japanese Application No. 2003-399237 filed Nov. 28, 2003 and Japanese Application No. 2004-290168 filed Oct. 1, 2004; the above-noted applications incorporated herein by reference in their entirety.
- The present invention relates to a packaging container for a microwave oven such as a packaging pouch, a cup, or a tray filled with contents such as a retort food containing a liquid substance, a solid substance, or a mixture of them. The packaging container of the present invention is capable of automatically releasing water vapor or the like to be generated inside the packaging container, preventing the rupture and deformation of the packaging container, scattering of the content, and allowing one to easily recognize the fact that the packaging container is opened under heating in a microwave oven.
- Heating of a packing container such as a packaging pouch, a cup, or a tray hermetically filled with a retort food, a frozen food, or the like in a microwave oven increases the pressure inside the pouch and a container due to water vapor or the like to be generated from contents under heating. The packaging container may tear, and the content may scatter, to thereby make the inside of the microwave oven dirty or harm a human body by burning or the like.
- Thus, before heat-cooking such a packaging container in a microwave oven, methods of preventing tearing of the packaging container are employed. That is, the packaging container is partly opened in advance or the packaging container itself is pierced, to thereby discharge out water vapor or the like to be generated inside the packaging container.
- However, such methods involve much time and effort for a general consumer. Further, when these methods are applied, the methods have disadvantages in that a flavor of the contents cooked by heating is lost because the water vapor generated by microwave heating is immediately discharged out of the packaging container and a heat steaming effect of the water vapor on the content is reduced.
- To overcome such disadvantages, there have been proposed various packaging containers each provided with an automatic opening mechanism with which an increase in the inner pressure of the packaging container under heating in a microwave oven is automatically relieved (see, for example,
Patent Documents 1 to 4). - In each of those packaging containers, the opening of the packaging container by heating in a microwave oven can be judged on the basis of the sound of water vapor to be released on and after opening and clouding of the inside of the microwave oven due to the water vapor. However, this method of judging the opening is hard to recognize and may cause one to ignore the opening of a packaging container.
- To overcome such disadvantages, there has been proposed a container, a food pouch, and the like, each of which is specifically designed to be heated in a microwave oven and is coupled with a separate alarm whistle (see Patent Document 5). However, each of those containers requires a step of using a high-cost, separate alarm whistle and coupling the alarm whistle. Accordingly, there arises, for example, a problem in that the production process of each of the containers becomes complicated, which results in an increase in cost.
- Meanwhile, there has been also proposed an ordinary packaging pouch not heated in a microwave oven, a heat seal part of which is provided with a hidden printing layer so that a letter or symbol appears upon opening of the pouch to prevent, for example, mixing of a toxic substance or the like (see, for example, Patent Document 6). However, in such a packaging pouch, it becomes difficult to recognize a letter or symbol appearing upon opening unless an area of a portion to be provided with the hidden printing layer is equal to or larger than a certain value. Therefore, it has not been possible to apply this technique to a vapor release seal part opening automatically upon heating of a packaging container for a microwave oven such as a packaging pouch, a cup, or a tray.
- Patent Document 1: JP 10-59433 A
- Patent Document 2: JP 10-95471 A
- Patent Document 3: JP 10-101154 A
- Patent Document 4: JP 2002-249176 A
- Patent Document 5: JP 06-245861 A
- Patent Document 6: Japanese Utility. Model Application Laid-open No. 62-90334 A
- Problems To Be Solved By The Invention
- Therefore, an object of the present invention is to provide a packaging container for a microwave oven such as a packaging pouch, a cup, or a tray constituted by a packaging material which itself is processed with no need for a special member or a complicated step so that one can easily recognize that heat-cooking of contents in the packaging container has been completed and the packaging container has automatically opened. Another object of the present invention is to provide a packaging container for a microwave oven capable of avoiding a risk of spilling contents in the packaging container or a risk of contact with an opening to cause a heat injury upon heating in a microwave oven.
- Means For Solving The Problems
- The inventors of the present invention have made extensive studies. As a result, they have found that the above-mentioned problems can be solved by providing, by means of printing processing or the like, a vapor release seal part having a weakened part of each of surface and back pack aging materials constituting a packaging container for a microwave oven such as a packaging pouch, a cup, or a tray with a mark developing means with which exfoliation opening of the vapor release seal part can be recognized by a difference between the surface and back packaging materials. Thus, the inventors have completed the present invention.
- That is, the present invention employs the following
constitutions 1 to 15. - 1. A packaging container for a microwave oven hermetically sealed by heat-sealing with a plastic film, the packaging container including a vapor release seal part having a weakened part, characterized in that the vapor release seal part is provided with a mark developing means with which exfoliation opening of the vapor release seal part can be recognized by a difference between surface and back packaging materials constituting the vapor release seal part.
- 2. A packaging container for a microwave oven according to the
above item 1, characterized in that the mark developing means is constituted by providing a vapor release seal part of one plastic film constituting the packaging container with a printing layer having a pattern having a void part and by providing a vapor release seal part of the other plastic film constituting the packaging container with a printing layer having a pattern corresponding to the void part. - 3. A packaging container for a microwave oven according to the
above item 1, characterized in that the mark developing means is constituted by coloring a vapor release seal part of one plastic film constituting the packaging container a first color and by coloring a vapor release seal part of the other plastic film constituting the packaging container a second color different from the first color. - 4. A packaging container for a microwave oven according to the
above item 1, characterized by the mark developing means comprising a peeling surface of which opacifies or whitens in association with peeling due to cohesion failure of the vapor release seal parts of the plastic films constituting the packaging container. - 5. A packaging container for a microwave oven according to the
above item 4, characterized in that the mark developing means is constituted by providing a color printing layer for an upper layer of the vapor release seal part of at least one plastic film constituting the packaging container on a side of an external surface of the container. - 6. A packaging container for a microwave oven according to any one of the
above items 1 to 5, characterized in that the vapor release seal part is formed continuously along the peripheral edge seal part of the packing container. - 7. A packaging container for a microwave oven according to any one of the
above items 1 to 5, characterized in that the vapor release seal part is formed separately from the peripheral edge seal part of the packing container. - 8. A packaging container for a microwave oven according to any one of the
above items 1 to 7, characterized in that the vapor release seal part is provided with a through-hole, a semi through-hole, or a slit to thereby form a weakened part. - 9. A packaging container for a microwave oven according to any one of the
above items 1 to 5, characterized in that a notch is formed inwardly into the container and a periphery edge of the notch is heat sealed to thereby form the vapor release seal part having the weakened part. - 10. A packaging container for a microwave oven according to any one of the
above items 1 to 9, characterized in that a pouring port forming means is arranged near the vapor release seal part. - 11. A packaging container for a microwave oven according to any one of the
above items 1 to 10, characterized in that the packaging container includes a packaging pouch hermetically heat-sealed with a plastic film. - 12. A packaging container for a microwave oven according to the
above item 11, characterized in that the packaging pouch includes a standing pouch. - 13. A packaging container for a microwave oven according to the
above item 11 or 12, characterized in that the packaging pouch includes a packaging pouch having a branched section. - 14. A packaging container for a microwave oven according to any one of the
above items 1 to 5, characterized in that the packaging container is hermetically sealed by heat-sealing of a container main body having a flange part with a lid composed of a plastic film. - 15. A packaging container for a microwave oven according to the above item 14, characterized in that the vapor release seal part is formed by causing a heat seal part between the flange part of the packaging container and the lid to project toward an inside of the container.
- [
FIG. 1 ] A view showing an example of the application of the present invention to a packaging pouch for a microwave oven. - [FIGS. 2] Views each explaining a mark developing means to be provided for a vapor release seal part of the packaging pouch of
FIG. 1 . - [FIGS. 3] Views each explaining a mark developing upon exfoliation opening of the vapor release seal part of the packaging pouch of
FIG. 1 . - [
FIG. 4 ] A view showing another example of the application of the present invention to a packaging pouch for a microwave oven. - [
FIG. 5 ] A view showing another example of the application of the present invention to a packaging pouch for a microwave oven. - [
FIG. 6 ] A view showing another example of the application of the present invention to a packaging pouch for a microwave oven. - [
FIG. 7 ] A view showing another example of the application of the present invention to a packaging pouch for a microwave oven. - [
FIG. 8 ] A view showing another example of the application of the present invention to a packaging pouch for a microwave oven. - [
FIG. 9 ] A view showing an -example of the application of the present invention to a tray-shaped container for a microwave oven. - [
FIG. 10 ] A plan view of the container ofFIG. 9 . - [FIGS. 11] Schematic views each showing the section of the vapor release seal part of the container of
FIG. 9 . -
- 1, 21, 31, 41, 51, 61 packaging pouch for a microwave oven
- 2, 112 peripheral edge seal part
- 3, 43, 53, 113 vapor release seal part
- 4, 44, 54 weakened part
- 5 notch
- 6 perforation
- 7 bottom folding part
- 11 void part
- 12, 14 solid pattern part
- 13 pattern
- 52 branched section
- 56 part (opposing part)
- 57 opening preventive mean
- 58 branched section base part
- 100 packaging container for a microwave oven
- 101 container main body
- 102 flange part
- 103 lid
- 115 opening part
- Plastic films forming a packaging container such as a packaging pouch, a cup, and a tray for a microwave oven in the present invention employ a plastic material having heat sealing property and generally used for production of a packaging container. Examples of such a plastic material include: monolayer films or sheets each formed of a thermoplastic resin having a heat sealing property; and multilayer films, sheets, or the like each prepared by laminating a thermoplastic resin having heat sealing property and other thermoplastic resin(s) or the like.
- Examples of such a plastic material having a heat sealing property include: a known olefin resin such as a low density polyethylene, a linear low density polyethylene, a medium density polyethylene, a high density polyethylene, a polypropylene, a propylene-ethylene copolymer, an ethylene-vinyl acetate copolymer, an olefin-based resin subjected to graft modification with an ethylene-based unsaturated carboxylic acid or an anhydride thereof; a polyamide resin or copolyamide resin having a relatively low melting point or relatively low softening point; a polyester resin or copolyester resin; and a polycarbonate resin.
- Examples of other plastic material(s) to be laminated with the plastic materials having heat sealing property include a thermoplastic resin or various barrier films each having heat sealing property or having no heat sealing property.
- Examples of such thermoplastic resin can include: polyolefins such as crystalline polypropylene, a crystalline propylene-ethylene copolymer, crystalline polybutene-1, crystalline poly4-methylpentene-1, low-density polyethylene, medium-density polyethylene, high-density polyethylene, an ethylene-vinyl acetate copolymer (EVA), a saponified product of an EVA, an ethylene-ethyl acrylate copolymer (EEA), and an ion-crosslinked olefin copolymer (ionomer); aromatic vinyl copolymers such as polystyrene and a styrene-butadiene copolymer; vinylhalide polymers such as polyvinyl chloride and a vinylidene chloride resin; a polyacrylic resin; nitrile polymers such as an acrylonitrile-styrene copolymer and an acrylonitrile-styrene-butadiene copolymer; polyesters such as polyethylene terephthalate and polytetramethylene terephthalate; various polycarbonates; a fluorine-based resin; and polyacetals such as polyoxymethylene. Those thermoplastic resins can be used independently, or with being blended with two or more kinds of them. Furthermore, those thermoplastic resins may be used to be blended with various additives.
- In addition, examples of various barrier films can include: a silica-deposited polyester film; an alumina-deposited polyester film, a silica-deposited nylon film, an alumina-deposited nylon film, an alumina-deposited polypropylene film, a carbon film-deposited polyester film, and a carbon film-deposited nylon film; a co-deposited film obtained by simultaneously vapor-depositing alumina and silica onto a base film such as a polyester film or a nylon film; a film obtained by co-extruding nylon 6/metha-xylylene diamine nylon 6 and a film obtained by co-extruding a polypropylene/ethylene-vinyl alcohol copolymer; an organic resin-coated film such as a polyvinyl alcohol-coated polypropylene film, a polyvinyl alcohol-coated polyester film, a polyvinyl alcohol-coated nylon film, a polyacrylic acid-based resin-coated polyester film, a polyacrylic acid-based resin-coated nylon film, a polyacrylic acid-based resin-coated polypropylene film, a polyglycolic acid resin-coated polyester film, a polyglycolic acid resin-coated nylon film, and a polyglycolic acid resin-coated polypropylene film; and a film obtained by coating a hybrid coating material consisting of an organic resin material and an inorganic material on a base film such as a polyester film, a nylon film, a polypropylene film, and the like. Those barrier films can be used independently, or with being combined with two or more kinds of barrier films.
- In the present invention, a packaging container for a microwave oven such as a packaging pouch, a cup, or a tray is produced by forming or molding an unoriented, uniaxially oriented, or biaxially oriented film or sheet constituted by any one of the above plastic materials into a pouch and the like according to an ordinary method. When a packaging pouch is produced by means of a laminated film composed of a thermoplastic resin having heat-sealing property and a thermoplastic resin having no heat-sealingproperty, heat-sealing is performed in a state where thermoplastic resin layers each having a heat-sealing property are arranged so that each of them serves as an inner surface. An adhesive resin layer can be interposed between adjacent layers constituting the laminated film as required.
- Next, the packaging container for a microwave oven of the present invention will be described in detail on the basis of the drawings in conjunction with an example of the application of the present invention to a packaging pouch. However, the following specific examples do not limit the present invention.
- FIGS. 1 to 3 are views of the present invention, each showing an example of a packaging pouch for a microwave oven provided with a vapor release seal part having a weakened part.
FIG. 1 is a front view of the packaging pouch, and FIGS. 2 are enlarged schematic views each explaining the mark developing means to be provided for the vapor release seal part of the packaging pouch. In addition, FIGS. 3 are enlarged schematic views each explaining a mark developing owing to the exfoliation opening of the vapor release seal part upon heating of the packaging pouch in a microwave oven. - The
packaging pouch 1 for a microwave oven was produced by subjecting a peripheraledge seal part 2 of a packaging material (plastic film) constituting the surface and back of the pouch to heat-sealing and by providing a corner part of the pouch with a vaporrelease seal part 3 having a weakenedpart 4.Notches 5 are formed in the upper part of the pouch to facilitate an opening of the pouch after the completion of cooking by means of a microwave oven. - In the packaging pouch, the weakened
part 4 is formed by providing the vaporrelease seal part 3 with a single through-hole. The weakened part can also be formed by providing a semi through-hole or a slit instead of the through-hole. The vaporrelease seal part 3 may be provided with multiple through-holes, semi through-holes, or slits. - As shown in
FIG. 2 (A), a pattern 12 having avoid part 11 is solid-printed on the vaporrelease seal part 3 of the packaging material of one of the surface and the back constituting thepackaging pouch 1. Meanwhile, as shown inFIG. 2 (B), a pattern 13 corresponding to thevoid part 11 ofFIG. 2 (A) is printed on the vaporrelease seal part 3 of the other packaging material. The pattern 13 is preferably formed to be larger than thevoid part 11 so that alignment upon heat-sealing of the packaging pouch may be easily performed. - The vapor
release seal part 3 is formed by superimposing thevoid part 11 of each of the surface and back packaging materials constituting thepackaging pouch 1 and the pattern 13 corresponding to the part on each other, and by subjecting the resultant to heat-sealing. As a result, as shown inFIG. 2 (C), the vaporrelease seal part 3 is provided with a pattern 14, the entire surface of which is uniformly solid-printed. The weakenedpart 4 is formed in the vaporrelease seal part 3 by providing a through-hole simultaneously with or after the heat-sealing. - When contents such as curry or stew is added and hermetically sealed in the
packaging pouch 1 and thepackaging pouch 1 is heated in a microwave oven, an inner pressure of thepackaging pouch 1 increases owing to water vapor or the like generated from the content, and then thepackaging pouch 1 expands from its center point P toward its peripheral edge part. As a result, stress concentrates on a part B of the vaporrelease seal part 3 closest to the center point P, whereby the breakage and opening of the vaporrelease seal part 3 starts. - The vapor
release seal part 3 peels and regresses owing to the stress concentration. When the peeling reaches the weakenedpart 4, thepackaging pouch 1 partially opens so that water vapor or the like is discharged to the outside. Accordingly, the rupture of thepackaging pouch 1 can be prevented. - As shown in FIGS. 3(A) and 3(B), the solid-printed pattern 12 having the
void part 11 printed on the vapor release seal part of each packaging material constituting thepackaging pouch 1 and the pattern 13 corresponding to thevoid part 11 develop in the vaporrelease seal part 3 that has peeled and opened. As a result, one can easily recognize automatical opening of thepackaging pouch 1 and completion of the heat-cooking of the contents. The pattern to be formed in the vapor release seal part can be arbitrarily selected. In addition, the pattern can be provided for not only the vapor release seal part but also a part adjacent to the vapor release seal part. - In the above example, the mark developing means was constituted by printing a pattern on the vapor release seal part of each packaging material constituting the packaging pouch. The mark developing means can also be constituted by coloring the vapor release seal part of one packaging material constituting the packaging pouch a first color and by coloring the vapor release seal part of the other packaging material a second color different from the first color.
- For example, when printing is performed so that the surface of the vapor release seal part of the packaging pouch has a red color and the back of the part has a blue color, the vapor release seal part is colored to be purple after heat-sealing. When the packaging pouch is heated in a microwave oven so that the vapor release seal part peels and opens, the color of the surface changes to red and the color of the back changes to blue. Therefore, one can easily recognize that the heat-cooking of the content has been completed and the pouch has automatically opened.
- In the above example, the corner part of the
packaging pouch 1 was provided with the vaporrelease seal part 3 of a circular shape in such a manner that the vaporrelease seal part 3 would be separated from the peripheraledge seal part 2. The position where the vaporrelease seal part 3 is placed, the number of the vaporrelease seal parts 3, the shape and dimensions of each of the vaporrelease seal parts 3, and the like can be arbitrarily selected. The shape, dimensions, and the like of the weakenedpart 4 to be formed in the vaporrelease seal part 3 can also be appropriately selected. In addition, any one of the methods such as machine work (for example, punching) and laser processing can be arbitrarily selected as a method of forming the weakenedpart 4. - FIGS. 4 to 6 are views each showing another example of the application of the present invention to a packaging pouch for a microwave oven.
- A packaging pouch 21 of
FIG. 4 shows an example of the application of the present invention to a standing pouch. In this example, the shape of the vaporrelease seal part 3 to be formed in a corner part of the packaging pouch 21 is substantially a triangle, and the bottom of the packaging pouch 21 is provided with abottom folding part 7. The other constitutions of the packaging pouch are the same as those of thepackaging pouch 1 ofFIG. 1 . - Of course, the shape of the vapor
release seal part 3 can be appropriately changed to an oblong, a quadrangle, a trapezoid, or the like instead of the triangle. - [
FIG. 5 ] is a view showing another example of the application of the present invention to a standing pouch. - In this packaging pouch 31, the shape of the vapor
release seal part 3 is substantially a quadrangle, and thevapor release part 3 is connected to the peripheraledge seal part 2 of a corner part. In addition, aperforation 6 is formed to facilitate the opening of the pouch. The other constitutions of the packaging pouch are the same as those of the packaging pouch 21 ofFIG. 4 . - [
FIG. 6 ] is a view showing another example of the packaging pouch for a microwave oven of the present invention. - In a packaging pouch 41, a cutout 44 serving as a weakened part and directed toward the inside of the pouch is arranged near a corner part of the packaging pouch 41. A vapor release seal part 43 having a weakened part is formed by subjecting the peripheral edge part of the cutout 44 to heat-sealing. A part distinguished from the pouch main body of the packaging pouch 41 by the cutout 44 is provided with an
opening facilitating means 6 such as a perforation or laser processing. The peripheraledge seal part 2 is provided with thenotches 5. A pouring port (not shown) can be formed in the packaging pouch 41 by opening the pouch 41 along theopening facilitating means 6 from thenotch 5 after the completion of heating in a microwave oven. - [
FIG. 7 ] is a perspective view showing another example of the application of the present invention to a packaging pouch for a microwave oven. - A foldable branched section 52 that can be lodged to one surface of a packaging pouch main body is formed in this packaging pouch 51. In addition, an upper edge part of the branched section 52 is provided with a cutout 54 directed toward the inside of the pouch. The peripheral edge part of the cutout 54 is subjected to heat-sealing so as to have a width equal to or narrower than that of the peripheral
edge seal part 2, whereby a vapor release seal part 53 having a weakened part is formed. In addition, each of the water vapor release seal part 53 of the packaging pouch 51 and a part 55 adjacent to the part 53 is provided with the mark developing means based on printed patterns as in the case of thepackaging pouch 1 shown in each of FIGS. 1 to 3. - In addition, in the packaging pouch 51 provided with the branched section 52, opening preventive means 57 based on heat-sealing are arranged at four sites in the branched section 52 of the packaging pouch main body and a part (opposing part) 56 opposed to the branched section 52 in order to prevent the break of the packaging pouch and the leakage of a content due to the peeling of the heat-seal of the pouch at a base part 58 of the branched section 52.
- [
FIG. 8 ] is a perspective view showing another example of the application of the present invention to a packaging pouch for a microwave oven. - This packaging pouch 61 is produced by removing the outside of the opening preventive means 57 provided for the branched section 52 in the packaging pouch 51 of
FIG. 7 along the outer periphery of themeans 57. The other constitutions of the packaging pouch 61 are the same as those of the packaging pouch 51 ofFIG. 7 . - In the examples of FIGS. 1 to 8, description has been given of an example of the application of the present invention to a packaging pouch for a microwave oven. Of course, the present invention is applicable to any packaging container for a microwave oven except a packaging pouch such as a cup, a tray, or a box.
- Any one of such containers is provided with a flange part. A vapor release seal part having a weakened part is formed in the flange part. The mark developing means of the present invention can be provided for the vapor release seal part or the vicinity of the part.
- FIGS. 9 to 11 are views showing an example of the application of the present invention to a tray-shaped container for a microwave oven.
FIG. 9 is a perspective view of the container, andFIG. 10 is a plan view of the container. In addition, FIGS. 11 are schematic views each showing the section of a vapor release seal part of the container.FIG. 11 (A) is a view showing a state before the peeling of the vapor release seal part, andFIG. 11 (B) is a view showing a state after the peeling of the vapor release seal part. - The
packaging container 100 for a microwave oven is hermetically sealed by subjecting aflange part 102 of a container main body 101 made of polypropylene to heat-sealing with a lid 103. A vaporrelease seal part 113 is formed in one corner portion of the container by causing a peripheral edge heat seal part 112 to project in a U-shape fashion toward the inside of the container. In addition, an opening part 115 for opening the lid 103 after the container has been subjected to heat-cooking in a microwave oven is formed in a corner portion opposed to the vaporrelease seal part 113 by causing the peripheral edge seal part 112 to project in a V-shape fashion toward the outside of the container. - As shown in
FIGS. 11 , the lid 103 of thepackaging container 100 is constituted by polyethylene terephthalate (PET) 121 having a thickness of 12 μm, a printing layer 122, an adhesive layer 123, nylon 124 having a thickness of 15 μm, the adhesive layer 123, and an easy-peel layer 125 having a thickness of 50 μm and composed of an unoriented polypropylene-based resin (CPP) in the stated order from the outside. In addition, the lid 103 is subjected to heat-sealing with theflange part 102 of the container main body at the easy-peel layer 125. - When the container is heated in a microwave oven, the inner pressure of the container increases owing to water vapor or the like generated from contents in the container. The cohesion failure of CPP constituting the easy-peel layer 125 of a heat seal part starts from the tip part of the vapor
release seal part 113 projecting in a U-shape fashion, so the vaporrelease seal part 113 starts to peel. When the inner pressure of the container additionally increases so that the peeling at the tip part of the vaporrelease seal part 113 reaches the outer edge of the heat seal part, the heat seal part opens as shown inFIG. 1 (B). - In association with the peeling of the heat seal part in the vapor
release seal part 113, irregularities are formed on a CPP peeling surface that has undergone cohesion failure to roughen the surface. In addition, the CPP peeling surface that has been transparent becomes white and opaque owing to a phenomenon such as stress whitening, so a white opacified layer 126 is formed on the surface of the easy-peel layer 125. As a result, such a state that the lower layer of the printing layer 122 of the lid 103 is white-coated is established. Accordingly, the peeled part can be easily recognized because the color of the printing of the peeled part appears to be different from the color of a peripheral part. The white opacified layer 126 formed by the peeling of the heat seal part can be recognized even when the printing layer 122 of the lid 103 is omitted; provided that the printing layer 122 is preferably arranged to enable the white opacified layer 126 to be recognized with improved definition. - The layer constitution of the lid 103 is not limited to that described above, and can be appropriately changed. For example, another layer constitution of the lid 103 is composed of the nylon 121 having a thickness of 15 μm, the printing layer 122, the adhesive layer 123, an ethylene-vinyl alcohol copolymer 124 having a thickness of 12 μm, the adhesive layer 123, and the easy-peel layer 125 having a thickness of 50 μm and composed of a polyolefin-based resin in the stated order from the outside. Of course, the number of layers constituting the lid 103 maybe increased or decreased. The printing layer can be provided for not only the vapor
release seal part 113 but also a part adjacent to thevapor release part 113 or the entire surface of the lid 103. An adhesive to be interposed between adjacent layers constituting the lid 103 is not particularly limited, and an ordinary adhesive such as a polyurethane-based adhesive or an acid-modified polyolefin-based adhesive can be used. - The
flange part 102 of the container main body can be subjected to printing or coloring as desired. The shape and dimensions of the container main body are arbitrary, and the container may be, for example, a cylindrical cup, a rectangular parallelopiped tray, or a box. - The seal strength of each of the peripheral edge seal part and vapor release seal part of the packaging container for a microwave oven of the present invention can be 2.3 kg/15 mm width or more.
- A conventional packaging container automatically opening upon heating in a microwave oven involved a significant reduction in seal strength of an opening part upon heating, and could not achieve a seal strength of 2.3 kg/15 mm width or more needed for a packaging container for a retort food. A material, the seal strength of which reduces upon heating, is used in neither the peripheral edge seal part of the packaging container for a microwave oven of the present invention, nor the vapor release seal part of the container. In addition, the above seal strength can be maintained because no seal part is subjected to a processing treatment that results in a reduction in seal strength upon heating.
- As a result, the packaging container does not burst from its vapor release seal part or its peripheral edge seal part when the packaging container is subjected to a retort treatment after the packaging container has been filled with contents. In addition, the breakage of the packaging container at the time of the transport or storage of the packaging container can be prevented.
- In addition, even in the case of heating in a microwave oven, the vapor release seal part of the packaging container maintains its seal strength for a certain time period, and the inner pressure of the packaging container is kept high by water vapor. Therefore, a heat steaming effect on the content in the packaging container is obtained. As a result, significant effects, that is, an improvement in taste of the contents and a reduction in time required for the cooking of the contents, are exerted.
Claims (13)
1-15. (canceled)
16. A packaging container for a microwave oven hermetically sealed by heat-sealing with a plastic film, the packaging container comprising a vapor release seal part having a weakened part,
characterized in that the vapor release seal part is provided with a mark developing means with which exfoliation opening of the vapor release seal part can be recognized by an outer color difference between the opened vapor release seal part and adjacent parts caused by opacification or whitening in association with peeling due to cohesion failure of the vapor release seal part.
17. A packaging container for a microwave oven according to claim 16 , characterized in that the mark developing means is constituted by providing a color printing layer for an upper layer of the vapor release seal part of at least one plastic film constituting the packaging container on a side of an external surface of the container.
18. A packaging container for a microwave oven according to claim 16 , characterized in that the vapor release seal part is formed continuously along a peripheral edge seal part of the packing container.
19. A packaging container for a microwave oven according to claim 16 , characterized in that the vapor release seal part is formed separately from the peripheral edge seal part of the packing container.
20. A packaging container for a microwave oven according to claim 16 , characterized in that the vapor release seal part is provided with a through-hole, a semi through-hole, or a slit to thereby form a weakened part.
21. A packaging container for a microwave oven according to claim 16 , characterized in that a cutout is formed in the packing container inwardly into the container and a periphery edge of the cutout is heat-sealed to thereby form the vapor release seal part having a weakened part.
22. A packaging container for a microwave oven according to claim 16 , characterized in that a pouring port forming means is arranged near the vapor release seal part.
23. A packaging container for a microwave oven according to claim 16 , characterized in that the packaging container comprises a packaging pouch hermetically sealed by heat-sealing with a plastic film.
24. A packaging container for a microwave oven according to claim 23 , characterized in that the packaging pouch comprises a standing pouch.
25. A packaging container for a microwave oven according to claim 23 , characterized in that the packaging pouch comprises a packaging pouch having a branched section.
26. A packaging container for a microwave oven according to claim 16 , characterized in that the packaging container is hermetically sealed by heat-sealing of a container main body having a flange part with a lid composed of a plastic film.
27. A packaging container for a microwave oven according to claim 26 , characterized in that the vapor release seal part is formed by causing a heat-seal part between the flange part of the packaging container and the lid to project toward an inside of the container.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US11/604,685 US20070071855A1 (en) | 2003-11-28 | 2006-11-28 | Packaging container for microwave oven |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
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JP2003399237 | 2003-11-28 | ||
JP2003-399237 | 2003-11-28 | ||
JP2004290168A JP4569249B2 (en) | 2003-11-28 | 2004-10-01 | Packaging container for microwave oven |
JP2004-290168 | 2004-10-01 | ||
PCT/JP2004/017278 WO2005051800A1 (en) | 2003-11-28 | 2004-11-19 | Packaging container for microwave oven |
US11/604,685 US20070071855A1 (en) | 2003-11-28 | 2006-11-28 | Packaging container for microwave oven |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/017278 Continuation WO2005051800A1 (en) | 2003-11-28 | 2004-11-19 | Packaging container for microwave oven |
US10/580,831 Continuation US20070110856A1 (en) | 2003-11-28 | 2004-11-19 | Packaging container for microwave oven |
Publications (1)
Publication Number | Publication Date |
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US20070071855A1 true US20070071855A1 (en) | 2007-03-29 |
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ID=37894350
Family Applications (1)
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US11/604,685 Abandoned US20070071855A1 (en) | 2003-11-28 | 2006-11-28 | Packaging container for microwave oven |
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