JP7330483B2 - Package for microwave oven heating with automatic steam release function - Google Patents

Description

In the present invention, a product or food containing moisture is microwave-cooked, and steam generated from the heated contents increases the internal pressure of the package, causing the package to rupture even if the package expands. The present invention relates to a package body having a function of discharging only water vapor to the outside.

In recent years, the demand for cooked foods has been increasing with the progress of individual meals. The user generally eats the packaged cooked food after heating it in a microwave oven or warming it in hot water.

However, when the sealed packaged contents are heated in a microwave oven, the moisture in the contents turns into steam and expands in volume, thereby increasing the internal pressure of the package and expanding the package. When the internal pressure of the package exceeds the durability strength of the package, the package bursts, and the scattered contents not only stain the inside of the microwave oven, but also burn the user or damage the microwave oven. . Therefore, there is a demand for a technique for reducing the internal pressure inside the package, which rises during heating with a microwave oven.

In order to solve this problem, a technique is known in which the surface of a package made of a synthetic resin film is cut for vapor release. However, it is difficult to impart a barrier property to the contents in a package that has undergone a notch process, because oxygen, moisture, and the like enter the package through the notch.

Also, there is known a technique of weakening the heat-sealing strength at an arbitrary portion by incorporating a synthetic resin film made of a different material from the package into a portion of the heat-sealed portion of the package. However, if a film made of a material different from that of the package is incorporated into a portion of the heat-sealed portion of the package to weaken the heat-sealing strength at an arbitrary location, it is possible to impart sufficient heat-sealing strength to the package. Since it cannot be used, there is a problem that it is not suitable for products that require boiling sterilization or retort sterilization, or products with heavy contents.

In order to solve these problems, a heat-sealed part protruding in a U-shape is provided inside the package, only the heat-sealed part is peeled off, and water vapor is discharged from the non-heat-sealed part to the outside of the package. established a technique for adjusting the pressure inside the package, and according to this technique, it is possible to provide the package with high barrier properties against oxygen, moisture, etc., and sufficient heat-sealing strength.

However, with this technology, when the package expands due to microwave heating, the U-shaped steam-releasing heat-sealed part bends, making it easier for steam to stay in the package. It is necessary to increase the range from which steam escapes by removing the package and prevent the package from bursting. However, since this non-heat-sealed portion is in contact with the outside air, if the width is wide, moisture will easily enter when the package is subjected to boiling sterilization or retort sterilization, and bacteria will propagate during distribution. However, there is a risk that the package will be contaminated.

In addition, the current U-shaped steam release heat-sealed part is designed to have weak heat-sealed strength, and the internal pressure of the package makes it easy for all the heat-sealed parts to peel off, so the steam outlet is get wider. Furthermore, the shape of the non-heat-sealed portion surrounded by the U-shaped steam release heat-sealed portion is rectangular or trapezoidal, and the distance from the steam outlet to the outside is short. For these reasons, the steam release heat-sealed part faces downward when the steam outlet is open after heating in the microwave oven, or the contents leak out of the package when the package falls down. There are problems such as

An object of the present invention is to improve the heat-sealed shape of the steam release part, thereby having a function of discharging water vapor generated in the package to the outside, while having high barrier performance and sufficient strength performance, and A package for microwave ovens that has the function of suppressing the infiltration of moisture into the non-heat-sealed part provided in the heat-sealed part for steam escape from the outside of the package and the leakage of the contents from the steam outlet after microwave heating. It is to provide the body.

In order to solve the above problems, the invention according to claim 1 is a package for microwave heating in which a product or food containing moisture is contained as a package for microwave heating, wherein the package A vapor release heat-sealed part is provided on the upper part of the body for discharging the steam generated in the package during heating to the outside, and the steam release heat-sealed part is a heat-sealed peeling area adjacent to the contents. , a non - thermally fused portion extending obliquely upward following the thermally fused and peeled region; a first heat-sealed portion, a right-angled triangular second heat-sealed portion formed in the non-heat-sealed portion at a position obliquely above the first heat-sealed portion, and a side end of the package. And a columnar third heat-sealed portion formed in the non-heat-sealed portion at a position facing the first heat-sealed portion, and the second heat-sealed portion above the third heat-sealed portion comprising a steam outlet located opposite to the bonding portion and continuing to the non-thermally-sealed portion, one of the apexes of the first thermally-sealed portion facing the third thermally-sealed portion; One of the apexes of the second heat-sealed portion faces the steam outlet, and when the internal pressure of the package rises due to the steam, the heat-sealed peeling region is peeled by the pressure and the steam is released. It is characterized in that it penetrates into the non-thermally-sealed part and is discharged to the outside from the steam outlet via the non-thermally-sealed part, and the contents are suppressed from leaking from the steam outlet after heating in the microwave oven. It is something to do.

Further, the invention according to claim 2 is the package for heating in a microwave oven according to claim 1, characterized in that the steam escape heat-sealed part is provided on one side or on both sides. It is something to do.

Further, the invention according to claim 3 is the package for microwave heating according to claim 1 or 2, wherein the package for microwave heating includes two films arranged with the sealant surfaces facing each other. A self-supporting package in which a film folded with the sealant surface facing the front side is inserted into the bottom side of the bag in a state, and both side ends and the bottom where the folded film is inserted are heat-sealed, wherein the steam escape heat It is characterized by having a fused portion.

According to the present invention, when a package in which a content containing moisture is sealed is heated in a microwave oven, steam generated from the content is discharged to the outside before the package bursts, so that safe cooking can be performed. can do.

In addition, by providing a vapor release heat-sealed portion for discharging water vapor to the outside on the upper part of the package, it is possible to suppress moisture from entering the non-heat-sealed portion during boiling sterilization or retort sterilization, and Even if the steam outlet is directed downward after microwave heating, it is possible to suppress liquid leakage of the contents.

FIG. 3 is an explanatory diagram of a self-supporting package having a vapor-releasing heat-sealed portion on one side end. FIG. 4 is an explanatory diagram of a self-supporting packaging bag provided with vapor-releasing heat-sealed portions on both side ends; FIG. 4 is an explanatory diagram of a steam escape heat-sealed portion; It is explanatory drawing of a lamination|stacking film.

An embodiment of the present invention will now be described in detail with reference to FIGS. 1 to 4. FIG.

In FIG. 1 or 2, 1 or 2 is a package body, and the form of package body 1 or 2 is a self-supporting type that is easy for users to take out after heating in a microwave oven and has high storability of the contents. It is a package (standing bag).

The layer structure of the package 1 or package 2 uses a synthetic resin film with high heat resistance and impact resistance, and as shown in FIG. High polyethylene terephthalate film (hereinafter referred to as PET) 12 μm, 13 is a nylon film (hereinafter referred to as Ny) 15 μm with high impact resistance as an intermediate layer, 15 is a highly heat-resistant unstretched polypropylene film (hereinafter referred to as a sealant film). 60 μm, and these three kinds of synthetic resin films are laminated by a dry lamination method using a urethane-based two-liquid curing type adhesive 14 .

When manufacturing the self-supporting package 1 or package 2 shown in FIG. 1 or FIG. In order to provide the steam releasing heat sealing portion 9 at the side, a heat sealing plate is used in which the shape of the steam releasing heat sealing portion 9 is incorporated into a normal heat sealing plate for heat sealing the end portion of the package. The dimensions of the self-supporting package 1 or package 2 are 158 mm in height, 160 mm in width, and 45 mm in width when the bottom material is folded.

Next, the vapor escape heat-sealed portion 9 will be described.

FIG. 3 shows the structure of the steam release heat-sealed portion 9. Reference numeral 3 denotes a heat-sealed peeling region where the peeling occurs due to an increase in internal pressure of the package 1 or the package 2, and 4 the package 1 or the package 2. 5 is a non-heat-sealed portion leading to the steam discharge port 4 as the heat-sealed separation region 3 is peeled off, and 6 is a protruding first A heat-sealed portion, 7 is a projecting second heat-sealed portion, and 8 is a column-shaped third heat-sealed portion.

The lateral width a of the vapor release heat-sealed portion 9 is 13 mm to 20 mm, and preferably 15 mm to 17 mm from the viewpoint of filling suitability of contents and steam release suitability.

The vertical width b of the steam release heat-sealed portion 9 is from 30 mm to 50 mm, and from the viewpoint of the functionality of the steam release heat-sealed portion 9, it is preferably from 35 mm to 45 mm.

The width c of the steam discharge port 4 is 10 mm to 20 mm, preferably 13 mm to 17 mm from the viewpoint of the amount of steam discharged.

The position of the steam escape heat-sealed portion 9 is such that the range of heat-sealed peeling of the steam escape heat-sealed portion 9 is suppressed within the heat-sealed peeling region 5 during heating in the microwave oven, and the first heat melt-sealed portion 6 and the In order to exhibit the function of the second heat-sealing part 7, it is desirable to make the upper part of the bag as much as possible. Since it is necessary to provide a filling heat-sealed portion 11 for sealing, the package 1 or the package 2 is incorporated into both end heat-sealed portions 10 at a position 15 mm below the upper end portion.

By providing the steam escape heat-sealed part 9 on one side or both side ends of the package, the steam generated during microwave heating does not stay in the package 1 or package 2, and is smoothly released. While making it possible to discharge the moisture to the outside of the package 1 or the package 2 from the steam outlet 4 via the heat-sealed part 5, the moisture to the non-heat-sealed part 5 during the boiling sterilization process or the retort sterilization process. Infiltration can be suppressed, and leakage of contents can be suppressed with the steam outlet 3 facing downward after microwave heating.

In addition, by providing the steam release heat-sealed part 9 above the package 1 or the package 2, when filling the contents in the package 1 or the package 2, the steam release heat-sealed part 9 can be used as a filling nozzle. It becomes difficult to interfere with the filling work by

Furthermore, by setting the dimension d from the upper end of the package 1 or package 2 to the upper end of the steam release heat-sealed portion 9 to be 10 mm to 25 mm, more preferably 15 mm to 18 mm, the inside of the package 1 or package 2 It is possible to control the range of heat-sealed peeling in the heat-sealed portion 9 through which vapor escapes due to volume expansion to the heat-sealed peeling region 5 without special heat-sealing strength control management.

When a self-supporting package 1 or package 2 filled with a content containing a large amount of liquid such as curry, soup, pork soup, etc. is heated by a microwave oven, the moisture in the content becomes steam and the package 1 or package 1 or the package is heated. The internal pressure of 2 rises, the heat-sealed peeling region 3 is peeled by the pressure, and the steam filling the package 1 or 2 flows from the heat-sealed peeling region 3 to the non-heat-sealed part 5, The outflow direction is controlled by the third heat-sealed portion 8 and the steam is discharged to the outside from the steam discharge port 4 .

In this way, although the package 1 or package 2 heated by the microwave oven expands once due to an increase in internal pressure, the action of the steam release heat-sealed portion 9 causes the steam to be discharged before exceeding the durability strength, and the internal pressure increases. , the package 1 or package 2 continues to be heated without bursting.

After heating, when the package 1 or 2 is overturned when taking it out of the microwave oven, or when the package 1 or 2 is tilted to transfer the contents to a container or the like, the steam discharge port 4 is lowered. , the contents may pass through the heat-sealed peeling region 3 and the non-heat-sealed portion 5 and flow out from the steam outlet 4, but inside the non-sealed portion 5 When the content that has entered reaches the position of the first heat-sealed portion 6, the non-heat-sealed portion 5 bends with the first heat-sealed portion 6 as a starting point, narrowing the flow path of the content. Decrease.

Then, when the content reaches the position of the second heat-sealed portion 7, the non-heat-sealed portion 5 near the steam outlet 4 is pressed so as not to expand excessively, and the films are brought into close contact and closed. Since the contents are maintained, surface tension with the film near the steam outlet 4 acts on the contents, preventing the contents from flowing out of the package 1 or the package 2 .

In addition, even during heating, part of the liquid content is discharged from the steam outlet 4 together with the steam, so that the inside of the microwave oven becomes dirty, and when the user touches the main body of the package, the user's hands get dirty. Although there is a risk, since the non-heat-sealed portion 5 is narrowed by the first heat-sealed portion 6 and the second heat-sealed portion 7, the heat-sealed portion 5 enters the non-heat-sealed portion 5 from the heat-sealed separation region 3. The contents are not easily discharged from the steam outlet 4.

At the time of boiling sterilization or retort sterilization, moisture entering from the steam outlet 4 is removed from the package by the action of the first heat-sealed portion 6 and the second heat-sealed portion 7 and the heat-sealed peeling region 3. Intrusion into 1 or packaging 2 is prevented.

Next, a comparison with a conventional example when the package 1 is used will be shown.

20 packages 1 were filled with contents such as curry, corn soup, minestrone, pork soup, etc., and subjected to boiling sterilization under the conditions of 95 ° C. for 60 minutes, and water entered the heat-sealed part 9 for steam escape. As a result of confirming whether or not there was water intrusion in all the 20 packages 1, it was confirmed.

Next, when the package 1 after the boiling sterilization treatment was heated in a microwave oven under the conditions of 600 W x 2 minutes and 30 seconds, the package 1 expanded, but before bursting, due to the action of the steam-releasing heat-sealing part 9 It was confirmed that since the steam inside the package 1 is discharged, the package 1 can be continuously heated without exploding or overturning.

Next, the package 1 after heating in the microwave oven was left for 30 minutes with the steam outlet 4 facing downward, and it was confirmed whether or not the contents flowed out from the steam outlet 4. No outflow was confirmed.

On the other hand, under the same conditions, a self-supporting package of a current competitor's product with a U-shaped steam escape heat-sealed part was left for 30 minutes with the steam outlet facing downward. It was confirmed that most of the liquid contained in the object flowed out from the steam outlet.

From this comparison result, it is confirmed that the package provided with the vapor release heat-sealed portion 9 according to the present invention is clearly useful for the conventional products in terms of the effect of preventing the liquid leakage of the package filled with contents. Ta.

1 package (having a vapor release heat-sealed part on one side end)
2 package (having steam-releasing heat-sealed parts on both side ends)
3 Heat-sealed separation region 4 Steam exhaust port 5 Non-heat-sealed portion 6 First heat-sealed portion 7 Second heat-sealed portion 8 Third heat-sealed portion 9 Vapor release heat-sealed portion 10 Heat-sealed portions on both ends 11 Filling heat-sealed part 12 PET film (base film layer)
13 Ny film (intermediate layer)
14 adhesive layer 15 CPP film (sealant layer)
a Width of steam release heat-sealed portion 9 b Vertical width of steam release heat-sealed portion 9 c Width of steam discharge port 4 d Dimension from upper end of package to upper end of steam release heat-sealed portion 9

Claims (3)

A package for microwave heating containing a product or food containing moisture,
The upper part of the package is provided with a steam release heat-sealing part for discharging the steam generated in the package during heating to the outside,
The steam-releasing heat-sealed portion includes a heat-sealed peeling region adjacent to the contents,
a non-heat-sealed portion extending obliquely upward following the heat-sealed peeling region;
a right-angled triangle-shaped first heat-sealed portion formed in the non-heat-sealed portion at a position obliquely above and adjacent to the heat-sealed and peeled region;
a right-angled triangular second heat-sealed portion formed in the non-heat-sealed portion at a position obliquely above the first heat-sealed portion;
a columnar third heat-sealed portion formed in the non-heat-sealed portion at a side end of the package and facing the first heat-sealed portion;
a steam outlet located above the third heat-sealed portion and facing the second heat-sealed portion and continuing to the non-heat-sealed portion;
one of the vertexes of the first heat-sealed portion faces the third heat-sealed portion;
one of the apexes of the second heat-sealed portion faces the steam outlet;
When the internal pressure of the package rises due to the water vapor, the pressure causes the heat-sealed peeling region to peel off, the water vapor enters the non-heat-sealed portion, and the steam is discharged via the non-heat-sealed portion. 1. A package for heating in a microwave oven, characterized in that the contents are discharged to the outside from an outlet and the contents are prevented from leaking from the steam outlet after heating in the microwave oven . 2. The package for heating in a microwave oven according to claim 1, wherein said vapor-releasing heat-sealed part is provided on one side or on both sides. In the microwave oven heating package, a film folded with the sealant surface facing the front side is inserted into the bag bottom side in a state in which two films are arranged with the sealant surfaces facing each other, and both side ends and the folded film 3. The package according to claim 1 or 2, wherein the package is a self-supporting package having a heat-sealed bottom portion in which the is inserted.

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