JP2005082172A - Automatically-openable packaging bag for microwave oven to generate sound when opened - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatically-openable packaging bag for microwave oven capable of informing by the sound that heat-cooking of the content in the packaging bag is completed, and the packaging bag is automatically opened by working a packaging material itself to constitute the packaging bag for microwave oven without requiring any special member or step. <P>SOLUTION: The automatically-openable packaging bag for microwave oven capable of generating sound when the bag is opened is manufactured by providing a vapor release seal part having a non-sealed portion in a packaging bag which is sealed by heat-sealing a plastic film, and forming an air reservoir and an oscillation piece adjacent thereto in the non-sealed portion. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention automatically escapes the steam generated inside the packaging bag when the packaging bag filled with contents such as retort food made of liquid, solid, or a mixture thereof is heated in a microwave oven, The present invention relates to a packaging bag for a microwave oven that can prevent the packaging bag from being ruptured, deformed, or scattered contents, and can notify the opening of the packaging bag by means of pronunciation.

  When a packaging bag that is sealed and filled with retort food, frozen food, etc. is heated in a microwave oven, the pressure inside the bag rises due to water vapor generated from the contents during heating, and the packaging bag bursts and the contents scatter. At the same time, the inside of the microwave oven may be soiled, or the human body may be burned.

For this reason, before such a packaging bag is cooked in a microwave oven, the packaging bag is partially opened in advance, or water vapor generated in the packaging bag is generated by opening a hole in the packaging bag body. A method is taken to prevent the packaging bag from being broken.
However, such a method is time-consuming for general consumers, and since steam generated by microwave heating is immediately discharged out of the packaging bag, the steaming effect by steam is reduced and the taste is reduced. There is a drawback of falling.

In order to eliminate such drawbacks, various types of packaging bags provided with an automatic opening mechanism that automatically releases an increase in the internal pressure of the packaging bag during microwave heating have been proposed (for example, see Patent Documents 1 to 4). In these packaging bags, it is necessary to visually confirm the opening of the bag.
Therefore, when cooking the contents of the packaging bag in the microwave oven, if you leave the microwave oven or overlook the opening of the packaging bag due to other services, the contents after opening the packaging bag However, there is a problem that the moisture is lost due to excessive heating and the taste is lowered. In addition, depending on the type of the contents, there are some which can further improve the taste due to the steaming effect by heating for a certain period of time after opening the packaging bag, but a means for notifying the cooker of an appropriate steaming time is required.

  As a means of notifying that cooking of ingredients has been completed during cooking with a microwave oven, (1) a microwave oven dedicated signal whistle warming steamer with a separate signal whistle connected to a container dedicated to microwave heating, a food bag, etc. (See Patent Document 5), (2) In a cooked tableware container consisting of an upper lid provided with an ingredient storage part separate from the container body, the food container is automatically opened when heated in the ingredient storage part There has been proposed a tableware container (see Patent Document 6) in which a portion is provided, the easy-opening portion is formed in a thin line shape, and a whistle is emitted by the pressure of internal gas at the time of opening.

Japanese Patent Laid-Open No. 10-59433 Japanese Patent Laid-Open No. 10-95471 JP-A-10-101154 JP 2002-249176 A JP-A-6-245861 Japanese Patent Laid-Open No. 2000-226078

However, the above-mentioned microwave whistle warming and steaming device (1) is a microwave heating container or food bag connected with a separate signal whistle, and uses a separate signal whistle that is expensive. Since the process of connecting the signal whistle is required, the manufacturing process becomes complicated and there is a problem that the cost is increased.
In the food container of (2), a downward easy-opening portion provided to release food from the food storage portion provided on the upper lid into the container body is formed in a thin line shape, and the internal gas at the time of opening is opened. A whistle sound is generated by pressure, and it is extremely difficult to generate an actually effective whistle sound by the easy-opening portion having such a configuration.

  Therefore, the present invention eliminates these problems of the prior art, does not require special members or processes, and heats the contents of the packaging bag by processing the packaging material itself constituting the microwave packaging bag. It is an object of the present invention to provide a packaging bag for an automatic opening microwave oven which can notify by sound that cooking has been completed and the packaging bag has been automatically opened.

  As a result of intensive studies, the present inventors have provided a steam release seal portion having an unsealed portion in the packaging bag by heat-sealing the plastic film constituting the packaging bag for an automatic opening microwave oven, and an air reservoir is provided in the unsealed portion. And it was discovered that the above-mentioned problems can be solved by forming a resonator element adjacent to the present invention, and the present invention has been completed.

That is, the present invention has the following configuration.
1. At the time of opening characterized by providing a steam vent seal portion having an unsealed portion in a packaging bag that is sealed by heat sealing a plastic film, and forming an air reservoir and a vibrating piece adjacent to the air reservoir in the unsealed portion. Automatic opening microwave packaging bag that sounds.
2. 2. The packaging bag for an automatic opening microwave oven according to 1, wherein vibration pieces are provided on both the front and back surfaces of the steam release seal portion.
3. 2. The packaging bag for an automatic opening microwave oven according to 1, wherein the vibrating piece is provided on one side of the steam release seal portion.
4). The packaging bag for an automatic opening microwave oven according to any one of 1 to 3, wherein a steam release seal portion is provided connected to a peripheral seal portion of the packaging bag.
5). The packaging bag for an automatic opening microwave oven according to any one of 1 to 3, wherein the steam release seal portion is provided separately from the peripheral seal portion of the packaging bag.
6). The automatic opening microwave oven packaging bag according to any one of 1 to 5, wherein a steam release seal portion is provided at a corner portion of the packaging bag.
7). The packaging bag for an automatic opening microwave oven according to any one of 1 to 5, wherein a steam release seal portion is provided at a substantially central portion of a side edge portion of the packaging bag.
8). The packaging bag for an automatic opening microwave oven according to any one of 1 to 7, wherein a plurality of air reservoirs are provided in the steam release seal portion.
9. The packaging bag for an automatic opening microwave oven according to any one of 1 to 8, wherein a partition portion is provided at a connection portion between the air reservoir and the vibrating piece of the steam release seal portion to form a narrow connection portion.
10. The packaging bag for an automatic opening microwave oven according to any one of 1 to 9, wherein the sealing width of the portion adjacent to the initial breaking point of the steam release sealing portion is widened to suppress the opening speed of the packaging bag.
11. The packaging bag for an automatic opening microwave oven according to any one of 1 to 10, wherein a vibrating piece provided in the steam release seal portion is formed inside an unsealed portion adjacent to the air reservoir.
12 The packaging bag for an automatic opening microwave oven according to any one of 1 to 11, wherein a vibrating piece is formed by providing a cut in an unsealed portion of the steam release seal portion.
13. 13. The packaging bag for an automatic opening microwave oven according to 12, wherein the resonator element is formed by providing a continuous cut in the unsealed portion.
14 13. The packaging bag for an automatic opening microwave oven according to 12, wherein the resonator element is formed by providing discontinuous cuts in the unsealed portion.
15. The automatic opening microwave oven according to any one of 12 to 14, wherein the vibrating piece provided in the steam release seal portion is formed to be inclined with respect to a direction in which the steam is discharged in an unsealed portion adjacent to the air reservoir. Packaging bags.
16. 13. The automatic opening microwave oven according to any one of 1 to 12, wherein a vibrating piece is formed by providing an easy opening processing portion that opens due to the pressure of steam at the time of opening in the unsealed portion of the steam release seal portion Packaging bag.
17. The packaging bag for an automatic opening microwave oven according to 16, wherein the easy opening processing portion is formed by laser processing.
18. The packaging bag for an automatic opening microwave oven according to any one of 1 to 11, wherein a vibrating piece is formed by providing a punched portion in an unsealed portion of the steam release seal portion.
19. The automatic opening microwave oven according to any one of 1 to 18, wherein a weakening portion that crosses the connection portion is provided at a connection portion between the air reservoir and the vibration piece of the steam release seal portion so that the vibration piece can be cut off. Packaging bag.
20. The packaging bag for an automatic opening microwave oven according to any one of 1 to 19, wherein a seal processing part is partially provided in an air reservoir formed in an unsealed part of the steam release seal part.
21. The packaging bag for an automatic opening microwave oven according to any one of 1 to 20, wherein a vibrating piece is formed by inserting a separate member into an unsealed portion adjacent to the air reservoir.
22. The automatic opening microwave oven according to any one of 1 to 21, wherein a steam vent seal portion not having an air reservoir and a vibration piece is provided separately from the air vent seal portion and the steam vent seal portion formed with the vibration piece. Packaging bag.
23. The packaging bag for an automatic opening microwave oven according to any one of 1 to 22, wherein the sealing strength of the peripheral seal part and the steam release seal part is 2.3 kg / 15 mm or more.
24. 24. The automatic opening microwave oven packaging bag according to any one of 1 to 23, wherein a spout forming means is provided in the vicinity of a steam vent seal portion having an air reservoir and a vibrating piece.
25. The packaging bag for an automatic opening microwave oven according to any one of 1 to 24, wherein the packaging bag is a standing pouch.

  According to the present invention, the cooking of the contents of the packaging bag is completed and the packaging bag is automatically opened by processing the packaging material itself that constitutes the packaging bag for a microwave oven without requiring any special member or process. Thus, it is possible to manufacture a packaging bag for an automatic opening microwave oven capable of informing this by pronunciation at a low cost.

As the plastic film constituting the packaging bag for a microwave oven in the present invention, a plastic material having heat sealing properties which is usually used for manufacturing a packaging bag is used. Examples of such a plastic material include a single-layer film made of a thermoplastic resin having heat-sealability, a sheet, a multilayer film in which a thermoplastic resin having heat-sealability is laminated with another thermoplastic resin, and the like. Can be mentioned.
Examples of such a heat-sealable plastic material include known low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, high-density polyethylene, polypropylene, propylene-ethylene copolymer, and ethylene-vinyl acetate copolymer. Olefin resins such as olefin resins graft-modified with ethylenically unsaturated carboxylic acids or their anhydrides, polyamides or copolyamide resins having a relatively low melting point or low softening point, polyesters or copolyester resins, polycarbonate resins, etc. Is done.

Further, as other plastic materials laminated with the plastic material having heat sealability, thermoplastic resins and various barrier films having or not having heat sealability can be used.
Examples of such thermoplastic resins include crystalline polypropylene, crystalline propylene-ethylene copolymer, crystalline polybutene-1, crystalline poly-4-methylpentene-1, low-, medium-, or high-density polyethylene, Polyolefins such as ethylene-vinyl acetate copolymer (EVA), EVA saponified product, ethylene-ethyl acrylate copolymer (EEA), ion-crosslinked olefin copolymer (ionomer); polystyrene, styrene-butadiene copolymer, etc. Aromatic vinyl copolymers; halogenated vinyl polymers such as polyvinyl chloride and vinylidene chloride resins; polyacrylic resins; nitrile polymers such as acrylonitrile-styrene copolymers, acrylonitrile-styrene-butadiene copolymers; polyethylene Terephthalate, polytetramethylene terephthalate Can be exemplified thermoplastic resins such as polyacetal such as polyoxymethylene and the like; over polyesters such as preparative; various polycarbonates; fluorine-based resin. These thermoplastic resins can be used alone or in combination of two or more, and various additives may be blended and used.

  Various barrier films include silica-deposited polyester film, alumina-deposited polyester film, silica-deposited nylon film, alumina-deposited nylon film, alumina-deposited polypropylene film, carbon film-deposited polyester film, carbon film-deposited nylon film, and alumina and silica. Binary vapor-deposited film co-deposited on base film such as polyester film and nylon film, nylon 6 / metaxylylenediamine nylon 6 co-extruded film, polypropylene / ethylene-vinyl alcohol copolymer co-extruded film, and polyvinyl alcohol coated polypropylene Film, Polyvinyl Alcohol Coated Polyester Film, Polyvinyl Alcohol Coated Nylon Film, Polyacrylic Acid Tree Coated polyester film, polyacrylic acid resin coated nylon film, polyacrylic acid resin coated polypropylene film, polyglycolic acid resin coated polyester film, polyglycolic acid resin coated nylon film, organic resin coating such as polyglycolic acid resin coated polypropylene film Examples thereof include a film and a hybrid coating material made of an organic resin material and an inorganic material coated on a base film such as a polyester film, a nylon film, or a polypropylene film. These barrier films can be used alone or in combination of two or more.

  In this invention, the packaging bag for microwave ovens is comprised by heat-sealing the unstretched film comprised by the said plastic material, or the uniaxially or biaxially stretched by the conventional method. When the film is a laminated film of a thermoplastic resin having heat sealing properties and a thermoplastic resin having no heat sealing properties, heat sealing is performed so that the thermoplastic resin layers having heat sealing properties become inner surfaces. .

Hereinafter, the configuration of a packaging bag for an automatic opening microwave oven that is generated when opening according to the present invention will be described with reference to the drawings.
FIG. 1 is a plan view showing an example of a packaging bag for a microwave oven according to the present invention, and FIGS. 2 and 3 are states of stress concentration due to an increase in internal pressure when the packaging bag of FIG. 1 is heated in a microwave oven. It is a figure for demonstrating.

  In this packaging bag 1, a substantially triangular steam vent seal portion 3 is provided at a corner portion connected to the peripheral seal portion 2. An unsealed portion at the center of the steam release seal portion 3 is provided with an air reservoir 4 and a rectangular vibrating piece 5 adjacent to the air reservoir 4, and the peripheral portion 6 of the vibration piece 5 is punched and the steam release seal portion 3. It is separated from.

When the packaging bag 1 is heated in a microwave oven, the packaging bag 1 expands due to water vapor generated from the contents, and stress concentration occurs from the center of the bag toward the peripheral seal portion 2 as shown in FIG. . When this stress concentration reaches the tip of the steam release seal portion 3, as shown in FIG. 3, a break opening of the steam release seal portion starts from the tip (the portion where this break opening starts is referred to as "initial break point"). ”), When the seal part retreats and the separation reaches the air reservoir 4, the water vapor is stored in the air reservoir 4, and then vibrates the vibrating piece 5 vigorously and emits a whistling sound of“ pea ”. It discharge | releases outside from the peripheral part 6 of the piece 5, and the packaging bag 1 opens partially.
Then, the cook can know that the cooking of the contents of the packaging bag 1 has been completed by the pronunciation of the vibrating piece 5.

  The vibration piece 5 heat seals the plastic film constituting the packaging bag 1 to form the peripheral seal portion 2 and the vapor vent seal portion 3 of the packaging bag 1, and then punches the unsealed portion of the vapor vent seal portion 3. By doing so, it can be provided on both the front and back surfaces of the vapor vent seal part 3. Further, after the vibrating piece 5 is formed in advance on the unsealed portion of the vapor vent seal portion 3 on one side of the plastic film constituting the packaging bag 1 by punching or the like, the peripheral seal portion 2 and the vapor vent seal portion 3 are heat sealed By doing so, it can be provided only on one side of the vapor vent seal part 3.

The pitch, strength, and length of the sound generated by the vibrating piece 5 can be arbitrarily set by selecting the shape and size of the air reservoir 4 and the shape and size of the vibrating piece 5.
4-8 is a figure showing the other example of the packaging bag for automatic opening microwave ovens of this invention, respectively, and in the packaging bag of FIGS. 4-6, the air reservoir 4 and vibration piece of the steam-release seal | sticker part 3 are shown. Partition portions 7 and 7 are provided at the connection portion 5. By providing these partition portions 7 and 7, the time during which the water vapor from the contents stays in the air reservoir 4 becomes longer, so the contents in the packaging bag 1 are steamed by the pressurized water vapor, and the taste is reduced. Improved. Moreover, since the pressure of the water vapor discharged from the air reservoir 4 toward the vibration piece 5 is increased by the partition portions 7 and 7, the sound generation by the vibration piece 5 is increased and the sound generation time is also increased.

  In the packaging bag 1 of FIG. 7, by providing a plurality of air reservoirs 41, 42, 43 in the steam release seal portion 3, the time during which water vapor from the contents stays in the air reservoir is further increased, and the contents in the packaging bag Since the steaming effect which a thing receives further becomes larger, it is used especially suitably as a packaging bag for contents which require steaming for a long time.

In the packaging bag 1 of FIG. 8, by providing a plurality of cuts 8 in the unsealed part adjacent to the air reservoir 4 of the steam release seal part 3, the vibrating piece 5 is inclined with respect to the direction in which the steam is discharged. Forming.
In this example, two vibrating pieces 5 are formed by providing three cuts 8, but the number of cuts 8 and vibrating pieces 5 can be arbitrarily selected.

FIGS. 9 and 10 are diagrams showing other examples of the packaging bag for an automatic opening microwave oven according to the present invention. In these examples, the vibrating piece 5 provided in the vapor vent seal part 3 is connected to the peripheral seal part 2. Are formed in a substantially vertical direction.
In the packaging bag 1 of FIG. 9, the steam release seal portion 3 is provided at a substantially central portion of the side edge portion of the packaging bag 1, and the peripheral seal portion 2 is cut so that the peripheral portion 6 of the vibrating piece 5 is exposed. . On the other hand, in the packaging bag 1 of FIG. 10, the steam release seal part 3 is provided from the upper part of the side edge part of the packaging bag 1, and the peripheral seal part 2 is not particularly processed.

  FIG. 11 is a diagram showing another example of the automatic opening microwave packaging bag of the present invention. In this example, the steam release seal portion 3 having the air reservoir 4 and the vibrating piece 5 is provided separately from the peripheral seal portion 2 of the packaging bag 1. The other structure of the packaging bag 1 is basically the same as that of the packaging bag of FIG.

FIG. 12 is a diagram showing another example of the automatic opening microwave packaging bag of the present invention. In this example, a steam vent seal portion 3 having an air reservoir 4 and a vibrating piece 5 is provided at the corner portion of the standing pouch 11 connected to the peripheral seal portion 2, and an air reservoir and a vibrating piece are provided at the other corner portions. A steam release seal portion 13 that is not provided is provided. A weakened portion 14 formed of a through hole or the like is formed in the central portion of the vapor vent seal portion 13. Also, a notch 15 is provided as a spout forming means in the vicinity of the upper end of the peripheral seal portion 2 on both sides.
In this standing pouch 11, in addition to the steam vent seal portion 3 that generates sound when opened, the steam vent seal portion 13 that does not generate sound is provided, so that when the pouch is cooked in a microwave oven, the pouch is ruptured due to an increase in internal pressure. The contents are surely prevented from scattering and the safety is further improved. Further, after opening the pouch, the pouch is opened from the notch 15 so that the spout can be easily formed, and the cooked contents can be easily taken out. As the spout forming means, normal means such as perforations and score processing can be employed in addition to the notches.

Next, the configuration of the steam release seal portion that is sounded at the time of opening provided in the automatic opening microwave oven packaging bag of the present invention will be further described.
FIGS. 13 to 17 are partially enlarged views of a steam vent seal portion having an air reservoir that generates sound when opened and a vibrating piece adjacent to the air reservoir.

In the steam vent seal part 3 of FIG. 13, the overall shape is a substantially triangular shape, and an unsealed part at the center is provided with an air reservoir 4 and a rectangular vibrating piece adjacent to the air reservoir 4. The peripheral edge portion 6 of the piece 5 is separated from the steam release seal portion 3 by punching or the like. By providing partition portions 7 and 7 at the connection portion between the air reservoir 4 and the vibrating piece 5, the width of the connection portion is narrowed, and the time for the water vapor released from the contents of the packaging bag to stay in the air reservoir 4 is increased. It has been devised so that the taste is improved by elongating and steaming the contents with pressurized steam.
The water vapor staying in the air reservoir 4 is released toward the vibration piece 4, and at that time, the vibration piece 5 vibrates to emit a whistle sound. Since the water vapor pressure is increased, the sound produced by the vibrator element 5 is increased and the sound production time is also increased.

In the steam vent seal portion 3 of FIG. 14, the overall shape is a shape in which a triangle is connected to a trapezoidal tip, and the seal width of the portion B adjacent to the triangle tip A that becomes the initial breaking point is widened. . Further, an easy opening processing portion 16 made of discontinuous cuts is provided inside an unsealed portion adjacent to the air reservoir 4, and the easy opening processing portion 16 is separated and opened by the pressure of water vapor in the steam reservoir 4, The vibrating piece 5 is formed and pronounced.
In the steam release seal part 3, when the internal pressure of the packaging bag is increased by heating with a microwave oven, a break opening of the steam release seal part 3 starts from the initial break point A, and the seal part is peeled back. The opening speed is suppressed by widening the seal width of the portion B adjacent to A, and the steaming effect that the contents in the packaging bag are subjected to pressurized water vapor is enhanced.

  In this example, the easy opening processing portion 16 for forming the resonator element 5 is formed by discontinuous cuts (perforations), but the easy opening processing portion 16 is formed by other means such as laser processing or score processing. May be. Further, the position where the easy opening processed portion 16 is provided is not limited to the inside of the unsealed portion, and can be arbitrarily selected, for example, provided at the boundary between the unsealed portion and the sealed portion.

In the steam release seal portion 3 of FIG. 15, the vibration piece 5 is formed by providing continuous cuts on the three peripheral edges 6 of the vibration piece 5 inside the unsealed portion adjacent to the air reservoir 4. A weakening portion 17 is formed by connecting a perforation, score processing, laser processing, or the like at a connection portion (a side where the vibration piece 5 is not cut) between 4 and the vibration piece 5 so that the vibration piece 5 can be cut off. The other structure of this steam release seal part 3 is the same as that of FIG.
In this example, when cooking a packaging bag with a microwave oven, when the sound at the time of opening is not required, cooking can be performed after the vibrating piece 5 is cut out from the weakening portion 17.

  In the steam release seal portion 3 of FIG. 16, a seal processing portion 23 is partially provided inside the air reservoir 4 formed in the unsealed portion. In addition, by providing four partial punching portions 24 in the unsealed portion adjacent to the air reservoir 4, the vibrating piece 5 that is not completely separated from the vapor vent seal portion 3 is formed. With such a configuration, it is possible to adjust the pitch, strength, and duration of the sound when opening.

  In the steam vent seal portion of FIG. 17, a slit 26 is provided at the end of the unsealed portion adjacent to the air reservoir 4, and a separate member 25 is inserted into the unsealed portion from the slit 26 to constitute a vibrating piece. It is. The cuts 26 provided in the unsealed portion can be formed on one side or both the front and back sides of the vapor vent seal portion 3. Further, the separate member 25 serving as the vibrating piece is not limited to a plate-like member, and a flat cylindrical member or the like may be used.

The sealing strength of the peripheral seal part and the steam release seal part of the microwave packaging bag of the present invention can be 2.3 kg / 15 mm width or more.
In a conventional packaging bag that is automatically opened during heating in a microwave oven, the sealing strength of the opening portion is significantly reduced during heating, and the sealing strength of 2.3 kg / 15 mm width or more required for a packaging bag for retort food is obtained. I could not. In the microwave oven packaging bag according to the present invention, the seal strength of the peripheral seal portion and the steam-sealed seal portion itself should be maintained in order not to use or process a material that reduces the seal strength when heated. Is possible.

As a result, when the retort process is performed after the packaging bag is filled with the contents, the bag is not broken from the steam release seal portion or the peripheral seal portion, and the bag breakage during transportation or storage can be prevented.
Also, when heating in a microwave oven, the steam vent seal part maintains the seal strength for a certain period of time, the internal pressure in the packaging bag is maintained in a state increased by water vapor, and the steaming effect of heating is obtained, so the contents of The taste is improved and the cooking time can be shortened.
When the cooking of the contents of the packaging bag is completed and the packaging bag is automatically opened, the vibrating piece provided on the steam release seal part vibrates and a whistling sound is emitted. You can know that it has been completed.

The shape of the packaging bag for an automatic opening microwave oven of the present invention is not particularly limited, and can be applied to various types of packaging bags such as a standing pouch, a flat pouch, a three-side seal type, a pillow type, and a gusset type. When applied to, the bag can be heated independently in a microwave oven, and it is possible to open the bag after heating and take it out without spilling the contents.
The packaging bag for an automatic opening microwave oven of the present invention is a food heated by a microwave oven such as various retort foods such as curry, stew, meat dumplings, soup, zenzai, chilled foods such as dumplings, bake, pilaf, and frozen foods. It is suitably used as a packaging bag.

Next, the packaging bag for an automatic opening microwave oven of the present invention will be further described with reference to examples, but the following specific examples do not limit the present invention.
(Example 1)
In order from the outer layer, a 12 μm silica-deposited biaxially stretched polyester film, a 15 μm biaxially stretched nylon film, and a 70 μm polypropylene film were used to produce a roll-shaped laminate by dry lamination using a polyurethane adhesive. The laminate was attached to a bag making machine, and a pouch having a short side of 130 mm and a long side of 170 mm having a vibrating piece as shown in FIG.
This pouch was filled with 220 g of curry, sealed, and retort sterilized at 120 ° C. for 30 minutes. When the obtained pouch having a vibrating piece filled with curry was heated in a microwave oven with a rated output of 500 W, a break opening of the seal portion started from the front end portion of the steam release seal portion 3, and the break occurred in the air reservoir 4. The water vapor that arrived and accumulated in the air reservoir vibrated the vibration piece 5 and emitted it from the peripheral edge 6 of the vibration piece 5 while making a whistling sound. This whistle sound was clearly audible, and it was very easy to recognize that the cooking of the curry in the pouch was complete and the pouch opened automatically.

It is a figure which shows one example of the packaging bag for microwave ovens of this invention. It is a figure explaining the state of the stress concentration by the raise of an internal pressure when the packaging bag of FIG. 1 is heated with a microwave oven. It is a figure explaining the state of the stress concentration by the raise of an internal pressure when the packaging bag of FIG. 1 is heated with a microwave oven. It is a figure which shows the other example of the packaging bag for microwave ovens of this invention. It is a figure which shows the other example of the packaging bag for microwave ovens of this invention. It is a figure which shows the other example of the packaging bag for microwave ovens of this invention. It is a figure which shows the other example of the packaging bag for microwave ovens of this invention. It is a figure which shows the other example of the packaging bag for microwave ovens of this invention. It is a figure which shows the other example of the packaging bag for microwave ovens of this invention. It is a figure which shows the other example of the packaging bag for microwave ovens of this invention. It is a figure which shows the other example of the packaging bag for microwave ovens of this invention. It is a figure which shows the other example of the packaging bag for microwave ovens of this invention. It is the elements on larger scale of the steam removal seal | sticker part of the packaging bag for microwave ovens of this invention. It is the elements on larger scale of the steam removal seal | sticker part of the packaging bag for microwave ovens of this invention. It is the elements on larger scale of the steam removal seal | sticker part of the packaging bag for microwave ovens of this invention. It is the elements on larger scale of the steam removal seal | sticker part of the packaging bag for microwave ovens of this invention. It is the elements on larger scale of the steam removal seal | sticker part of the packaging bag for microwave ovens of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Packaging bag 2 Peripheral seal part 3, 13 Steam release seal part 4, 41, 42, 43 Air reservoir 5, 25 Vibrating piece 6 Vibrating piece peripheral part 7 Compartment part 8, 26 Break 11 Standing pouch 14, 17 Weaking part 15 Notch 16 Easy opening part 23 Sealing part 24 Punching part

Claims (25)

At the time of opening characterized by providing a steam vent seal portion having an unsealed portion in a packaging bag that is sealed by heat sealing a plastic film, and forming an air reservoir and a vibrating piece adjacent to the air reservoir in the unsealed portion. Automatic opening microwave packaging bag that sounds. 2. The packaging bag for an automatic opening microwave oven according to claim 1, wherein the vibrating pieces are provided on both front and back surfaces of the steam release seal portion. 2. The packaging bag for an automatic opening microwave oven according to claim 1, wherein the vibrating piece is provided on one side of the steam release seal portion. The automatic opening microwave oven packaging bag according to any one of claims 1 to 3, wherein the steam release seal portion is connected to a peripheral seal portion of the packaging bag. The automatic opening microwave oven packaging bag according to any one of claims 1 to 3, wherein the steam release seal portion is provided separately from the peripheral seal portion of the packaging bag. The packaging bag for an automatic opening microwave oven according to any one of claims 1 to 5, wherein a steam release seal portion is provided at a corner portion of the packaging bag. The automatic opening microwave packaging bag according to any one of claims 1 to 5, wherein a steam release seal portion is provided at a substantially central portion of a side edge portion of the packaging bag. The automatic opening microwave oven packaging bag according to any one of claims 1 to 7, wherein a plurality of air reservoirs are provided in the steam release seal portion. The packaging for an automatic opening microwave oven according to any one of claims 1 to 8, wherein a partition portion is provided at a connection portion between the air reservoir and the vibrating piece of the steam release seal portion so that the connection portion is narrow. bag. The automatic opening microwave oven packaging bag according to any one of claims 1 to 9, wherein a seal width of a portion adjacent to an initial breaking point of the steam release seal portion is widened to suppress an opening speed of the packaging bag. . The packaging bag for an automatic opening microwave oven according to any one of claims 1 to 10, wherein a vibrating piece provided in the steam release seal portion is formed inside an unsealed portion adjacent to the air reservoir. The packaging bag for an automatic opening microwave oven according to any one of claims 1 to 11, wherein the vibrating piece is formed by providing a cut in an unsealed portion of the steam release seal portion. The packaging bag for an automatic opening microwave oven according to claim 12, wherein a vibrating piece is formed by providing a continuous cut in an unsealed portion. The packaging bag for an automatic opening microwave oven according to claim 12, wherein the resonator element is formed by providing discontinuous cuts in the unsealed portion. The automatic opening according to any one of claims 12 to 14, wherein the vibration piece provided in the steam release seal portion is formed in an unsealed portion adjacent to the air reservoir so as to be inclined with respect to a direction in which the steam is discharged. Packaging bag for microwave oven. The self-opening electron according to any one of claims 1 to 12, wherein the vibration piece is formed by providing an easy-opening processing part that opens by the pressure of steam at the time of opening in the unsealed part of the steam release seal part. Packaging bag for range. 17. The automatic opening microwave oven packaging bag according to claim 16, wherein the easy opening processing portion is formed by laser processing. The packaging bag for an automatic opening microwave oven according to any one of claims 1 to 11, wherein the vibrating piece is formed by providing a punched portion in an unsealed portion of the steam release seal portion. The automatic aperture electron according to any one of claims 1 to 18, wherein a weakening portion that crosses the connection portion is provided at a connection portion between the air reservoir and the vibration piece of the steam release seal portion so that the vibration piece can be cut off. Packaging bag for range. The packaging bag for an automatic opening microwave oven according to any one of claims 1 to 19, wherein a sealing portion is partially provided in an air reservoir formed in an unsealed portion of the steam release sealing portion. 21. The automatic opening microwave oven packaging bag according to claim 1, wherein a vibrating member is formed by inserting a separate member into an unsealed portion adjacent to the air reservoir. The self-opening electron according to any one of claims 1 to 21, wherein a steam vent seal portion having no air reservoir and a vibration piece is provided separately from the steam vent seal portion having the air reservoir and the vibration piece. Packaging bag for range. The packaging bag for an automatic opening microwave oven according to any one of claims 1 to 22, wherein the sealing strength of the peripheral seal portion and the steam release seal portion is 2.3 kg / 15 mm or more. The automatic opening microwave oven packaging bag according to any one of claims 1 to 23, wherein a spout forming means is provided in the vicinity of the steam vent seal portion having an air reservoir and a vibrating piece. The packaging bag for an automatic opening microwave oven according to any one of claims 1 to 24, wherein the packaging bag is a standing pouch.

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