JP5114118B2 - Packaging for microwave oven cooking - Google Patents

Description

  The present invention relates to a microwave cooking container for food that contains food to be cooked by irradiation of a microwave oven.

A retort pouch-type container that can be heated by placing it in a microwave oven while containing food, as a container containing food that is cooked by microwave irradiation in a microwave oven. There is something. And since this retort pouch type container seals a storage part by stacking sheet materials and heat-sealing the corresponding side part, the internal pressure rises due to the generation of steam during heating. A packaging container has been proposed in which steam is vented so as not to rupture. For example, a container has been proposed in which an opening strip is pasted on a sheet material, and an opening from which steam is released is obtained by partial tearing using the opening strip (see Patent Document 1).
In addition, a cut portion is provided in a part of the layer constituting the inner surface side of the sheet material, and only this cut portion is fused and closed to an extent that can be opened by an increase in internal pressure during microwave heating, and the internal pressure during microwave heating There has also been proposed a packaging container in which the portion is opened by the rise of the pressure so as to allow the vapor to escape (see Patent Document 2).
Japanese Patent No. 2938518 (page 2-3, Fig. 2) Japanese Patent No. 3148160 (paragraph number 0006, FIG. 2)

For the former, which uses an opening band to obtain the opening for removing steam, considering the difference in the mechanism of the microwave oven and the response to heating at high output, the opening is surely made manually. Although it is useful because it is formed, it is necessary to use a member different from the sheet material of the opening band, which raises the problem of raising the price of the packaging container itself. Thus, in terms of safety design, it has not been realized with respect to the point that it is possible to implement an opening for venting in advance with a simple configuration.
In addition to the above-mentioned patent documents, many of the latter, in which the opening is formed by the latter increase in internal pressure, have been proposed. When the storage part begins to swell due to the steam generated by the above, it opens immediately, and even the steam that is desired to be held in the storage part is discharged to some extent, the steaming action on the stored items is lost, and the taste is significantly reduced There is a big problem.

And in the above-mentioned conventional technology, steam is removed from the upper surface of the container in a bumping state during cooking by interposing a bulging space on the container that is swollen by the fullness of steam from the container. No blockage can be made up to the opening, and the steam flow is straight toward the opening of the steam vent. For this reason, a part of the container that has jumped on the upper surface of the container due to bumping flies toward the opening of the steam vent and blows out from the opening of the steam vent, and further, the container that has reached the opening of the steam vent. A part of the glass was easily pushed by the momentum of the steam passing through the opening of the steam vent and scattered in the microwave oven.
Therefore, the present invention can provide a steam venting opening without using a tab material that is a separate member such as the above-described opening strip for the safety design of providing a steam venting opening manually. The purpose is to prevent the occurrence of spilling and splattering of the contents, and to enable cooking with good taste in a packaging container for microwave cooking that is easy to handle And

The present invention has been made in consideration of the above problems, and is a microwave oven cooking packaging container in which a side portion of a sheet material is heat-sealed to seal a storage portion of the contents,
Two heat seal parts are arranged close to the upper part of the storage part that becomes a bulge space above the stored item during microwave irradiation heating, and a steam vent passage is formed between the heat seal parts by overlapping sheet materials. , The direction of the steam vent passage is inclined with respect to the vertical direction of the storage portion,
In addition, a notch is made to penetrate through one of the heat seal portions located in the vicinity of the steam release passage, and a band-like torn portion is formed to cut each of the sheet material between the two heat seal portions with the notch being a starting end. ,
The steam vent passage and the belt-like tearing-scheduled portion are arranged so as to cross each other, and the storage portion communicates with the outside through the steam vent passage opened by the tearing of the belt-like tear-off scheduled portion, and has a steam venting means. ,
The container body is made of a sheet material for forming the sheet material and the container bottom surface to form a container top, said the container top, the corrugation is provided formed by folding the sheet material forming the container top surface, wrapping the corrugation The steam venting means is located in the portion, and a microwave cooking container for cooking is provided to solve the above problems.

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According to the present invention, since the notch is made to penetrate through one of the two heat seal portions, an opening for removing the steam can be obtained without using a method of attaching another member such as a tab material. The packaging container is obtained, and the manufacturing cost of the packaging container is not increased.
Further, even when microwaves are irradiated with microwaves, the contents of the container are heated in a state of bumping on the upper surface thereof, because the passage direction of the steam release passage is inclined with respect to the vertical direction of the contents (that is, since the inclined with respect to the vertical direction of put that yield capacity was in the housing portion of the packaging container filled under normal conditions in the compartment of the microwave oven when microwave irradiation heating in a microwave oven), and bumping Even if a part of the container that is bouncing on the upper surface of the container flies toward the opening of the steam vent, a part of the container that has flew does not directly reach the opening of the steam vent. This makes it possible to reliably prevent spilling and scattering of the contents due to bumping.

Next, the investigation techniques studied for reaching the present invention will be described with reference to FIGS.
1 and 2 showing the examination technique, reference numeral 1 in FIG . 1 denotes a microwave cooking packaging container. As shown in FIG. 1, the packaging container 1 has a sheet material 2 on the front and a sheet material 3 on the back. In addition, the sheet material 4 as a bottom surface is folded between the sheet material 2 and the container bottom side of the sheet material 2 and 3 so that the sheet material 4 can be unfolded. By developing the sheet material 2, a form called a standing pouch that can stand independently with a distance between the container bottom side center portions of the sheet materials 2 and 3 is exhibited.
As shown in the drawing, in the microwave cooking packaging container 1, the storage unit 5 that stores the stored item A is sealed by a peripheral seal portion formed by heat-sealing the opposite sides of the sheet material. ing. In the peripheral seal portion, the steam release means 8 is located at the upper corner of the container formed by the upper side seal portion 6 and the one side seal portion 7.

Since this microwave heating and cooking packaging container 1 is in the form of a standing pouch, it can be placed upright in the microwave oven or during microwave irradiation heating, so that the microwave oven is heated above the container at the time of microwave irradiation heating. The steam release means 8 is positioned above the storage portion that becomes the bulging space.
This steam venting means 8 located at the upper corner of one container formed by the upper seal part 6 and the side seal part 7 which are the container upper part in the standing state and which becomes the bulge space when heated, It consists of a steam release passage 9 and a band-like tearing scheduled portion 10 located between two heat seal portions. First, as shown in the drawing, the steam release passage 9 has a constant interval between the heat seal portion 11 for forming a passage continuing along the longitudinal direction of the upper side seal portion 6 from the side seal portion 7 and the upper side seal portion 6. Are formed from sheet materials 2 and 3 which are arranged in close proximity to each other and overlapped therebetween. The passage direction of the steam release passage 9 is along the longitudinal direction of the upper side seal portion 6 and is inclined so as to be orthogonal to the vertical direction of the storage portion 5. That is, the packaging container 1 is erected as a standing pouch in a microwave oven as usual, and steam is applied to the vertical direction of the contents A in the packaging container 1 in microwave irradiation heating. The extraction passage 9 is inclined at a right angle.

In this way, the steam vent passage 9 is located in a portion that becomes a bulging space and the direction of the passage is orthogonal to the up-and-down direction of the storage portion. Therefore, the steam vent passage 9 is cut by cutting the sheet materials 2 and 3 as will be described later. Even when the steam inside the storage part can be discharged to the outside from the steam release passage 9 during heating by opening across the steam, the steam blown up and blown up from the stored material collides on the side of the upper seal part 6 and is stored. It becomes turbulent above the object, and while the steam stays in the turbulent state, the expansion space that is the upper space of the contained material is inflated, and the steam pressure is increased in the expansion space, so that the steam is gradually discharged from the opening of the steam vent. To come. That is, since the steam is not directly discharged upward from the upper side seal portion 6, the pressure of the steam is maintained to some extent in the bulging space, and the steam is discharged from the opening of the steam in that state.
As shown in FIG. 2, if the sheet materials 2 and 3 in the portion of the steam vent passage 9 are cut vertically and microwave irradiation heating is performed, the steam in the storage portion 5 is in a turbulent state in the swelled space to some extent. Since it begins to discharge after being delayed, it will be steamed against the contents. In addition, even if the contents are bumped and part of the contents is bounced upward, some of the contents are sufficiently heavier than steam, and the turbulent flow of steam expands in the space as described above. As a result, it is not sent to the opening of the steam vent. In other words, even if the stored item bumps, a part of the stored item moves linearly toward the opening of the steam release passage 9 formed by the later-described tearing in the band-shaped torn portion 10 described above. In addition, it is possible to prevent the stored material from being blown out from the opening of the steam vent and the stored material from being scattered from the opening of the steam vent.

Next, in the band-like torn portion 10, a substantially C-shape that penetrates both the sheet materials 2 and 3 on which the heat seal portion 11 is bonded to the heat seal portion 11 located below the steam release passage 9. A tearing knob 13 that can be rolled up is formed in the heat seal portion 11 for forming a passage. Then, the two ends of the notch 12 are set so that the direction of extending the tear is directed to the upper side seal portion 6 when necessary (that is, when performing steam venting) with the two ends of the notch 12 as the start of tearing. The two ends of the notch 12 are positioned on the upper side seal portion 6 side with the arcuate portion of the notch 12 facing down (the container bottom side). Therefore, the direction in which the tear proceeds is defined as the direction crossing the steam release passage 9.
In this way, in the steam venting means 8, the steam vent passage 9 and the band-like tearing scheduled portion 10 are arranged in an intersecting manner, and an opening (steam venting opening) is formed in the steam venting passage 9 by the tearing of the belt-like tearing scheduled portion 10. Then, as shown in FIG. 2, the storage portion 5 communicates with the outside through the steam vent passage 9 having the opening so that the steam is discharged.

When the tearing knob 13 is picked up and pulled up, the tears formed in the band-like tearing scheduled portion 10 extend to the sheet materials 2 and 3 forming the steam release passage 9, respectively. Cut out. Further, since the upper side seal portion 6 where the tear reaches is formed by heat-sealing the sheet materials 2 and 3, the rigidity and strength are increased. It stops when it reaches (see FIG. 2). Therefore, even if the knob 13 for tearing is picked up and pulled up, the cut pieces are prevented from being broken up and separated, and small dust that should be taken care of when cooking is not generated.
Further, in the vapor venting means 8, the vapor vent passage 9 is formed between the two heat seal portions (the upper side seal portion 6 and the passage forming heat seal portion 11). The size of the opening can be set in advance, and this also makes it possible to adjust the steam discharge. The width of the vapor vent passage 9 is preferably 8 mm or more.

Next, the present invention will be described based on the embodiment shown in FIGS. As shown in FIG. 3, the present invention is a microwave oven cooking packaging container using two upper and lower sheet materials in which a container body is composed of a sheet material 2 a that forms the upper surface of the container and a sheet material 3 a that forms the lower surface of the container. 1 is implemented.
In this example, when microwave irradiation heating is performed, it is placed horizontally in the microwave oven, and the upper portion of the storage portion that becomes the bulging space above the stored item during microwave irradiation heating is the sheet material 2a. It comes to correspond. And the sheet | seat material 2a which is a container upper surface is provided with the pleat part 14 which folds this sheet | seat material 2a, and the vapor removal means 8 is provided in this pleat part 14. FIG. The pleat 14 is located at a position near one side of the packaging container 1, and the steam in the pleat 14 when the bulge space swells as will be described later by being horizontally placed and heated by microwave irradiation. The central portion including the extraction means 8 is set at a position that is not lower than the height position of the upper surface of the stored item.
The pleated portion 14 is in a state in which the sheet material 2a is overlapped by folding, and is opposed to the longitudinal direction of the protruding tip along the protruding tip (folded portion, see FIG. 3). A pair of heat seal portions 15 are arranged close to each other at a constant interval, and a steam vent passage 9 is formed between them. Each of the heat seal portions 15 is obtained by heat-sealing the sheet material 2 a superposed on the pleat portions 14.

And in this steam release means 8, the substantially C-shaped notch 12 is penetrated in one heat-sealing part 15, the two end parts of the notch 12 are used as the tearing start edges, and the tearing direction is the other heat-sealing part 15 side. A steam venting means 8 is formed by arranging the band-like tearing scheduled portion 10 set toward the steam passage 9 so as to intersect the steam vent passage 9, and a tearing knob 13 in one heat seal portion 15 is provided. The sheet material 2a of the steam vent passage 9 is cut by causing the pick and causing a tear so as to cross the steam vent passage 9, and an opening (a steam vent opening) is formed in a part of the steam vent passage 9 To be.
In the packaging container 1 of this example, the pleat 14 overlaps with the sheet material 2a so as to be inclined toward the general surface of the container upper surface, and when the packaging container 1 is put into a microwave oven as usual. It is placed sideways (with the folds 14 facing up) on a turntable or the like, and the passage direction of the steam vent passage 9 is inclined with respect to the vertical direction of the storage portion 5. . Immediate Chi, passage direction of the vapor vent passage 9 is a direction orthogonal to the direction in which the two heat-sealed portion 15 is opposed, with respect to the vertical direction of the contained object as in the passage direction of the steam vent passage 9 shown Inclined.

In this packaging container 1, when heating by microwave irradiation is performed in a state in which a steam vent opening is formed, the sheet material 2 a on the upper surface of the container is lifted by the steam generated from the contained material, but the pleat 14 is located on one side of the packaging container 1. Because of the close position, the pleat portion 14 remains in a depressed state (see FIG. 4). In this way, a bulge space is formed in which it swells and turbulently flows and stays inside. As in the above example, if the steam pressure rises to some extent in the expansion space, the steam is discharged from the opening of the steam release, and the steam stays in a turbulent state in the expansion space. It becomes to steam the things.
Since the pleat portion 14 itself is maintained in a depressed state, the steam vent passage 9 is not in a position where the steam blown up from the contained material directly hits, but the steam vent formed by cutting at the band-like torn portion 10. Steam does not escape without resistance from the opening, and a state of staying in the swelling space as described above is formed.
Furthermore, even if a part of the container is bounced upward from the upper surface of the container, the steam is sufficiently turbulent in the bulging space, so that a part of the container is sent to the steam vent passage 9. In the same manner as in the above-described embodiment, the stored items are prevented from being blown out or scattered.

Next, various types of containers were prepared, and the presence or absence of blockage of the vapor vent passage was compared. The results are shown in Table 1.
The embodiment shown in FIGS. 3 and 4 was taken as Example 1 . Each comparative example was as follows.
Comparative Example 1: As shown in FIG. 5, a heat seal portion a is continuously provided at a portion where one end portion of the upper side seal portion e and the upper end portion of the side seal portion c meet, and the heat seal portion a A band-shaped pre-scheduled portion b having a structure in which a slit is extended and a tear is extended downward is formed so that a space inside the storage unit is directly continuous with an opening formed by the band-shaped pre-scheduled portion b.
A dam heat seal portion g is formed at a large distance below the heat seal portion a, and the gap between the heat seal portion a and the dam heat seal portion g is gradually opened toward the center of the storage portion. The upper edge of the heat seal portion g for the weir was inclined. Between the upper and lower direction between the heat-sealed portion g for the heat seal portion a and the weir is sufficiently larger than the two intervals of heat-sealed portions in Example 1, and leads to the steam as in example 1 It does not become a constant-width passage that passes through.

Comparative Example 2: As shown in FIG. 6, the heat seal portion a is provided so as to be close to the side seal portion c, and the steam vent passage d formed between the heat seal portion a and the side seal portion c is provided. The direction of the passage is aligned with the vertical direction of the storage portion so as to be directly continuous with the storage portion, and the band-shaped tearing-to-be-cut portion b is configured to extend from the heat seal portion a to the side seal portion c.
As in Comparative Example 1, the heat seal portion g for the weir is formed at a large distance below the heat seal portion a, and the distance between the heat seal portion a and the heat seal portion g for the weir is the center of the storage portion. The upper edge of the heat seal portion g for the weir was inclined so as to gradually open toward the side. The vertical direction between the heat seal portion a and the heat seal portion g for the weir is sufficiently larger than the distance between the two heat seal portions in the first embodiment and the width of the steam release passage d. , So that it does not become a constant-width passage through which steam is guided.

  Comparative Example 3: As shown in FIG. 7, an unsealed portion f is formed in the center of the upper side seal portion e directly above the storage portion so that the unsealed portion f is directly continuous with the storage portion, and the upper side seal A band-shaped tear scheduled portion b is formed so as to include the upper end of the unsealed portion f in the longitudinal direction of the portion e, and the tear extends along the longitudinal direction of the upper-side seal portion e at the band-shaped tear scheduled portion b. Like that. The unsealed part f was cut at the tear.

  Comparative Example 4: As shown in FIG. 8, the unsealed portion f and the band-like torn portion b in Comparative Example 3 were formed at a position close to one end of the upper side seal portion e.

Real施例and the sheet material of the packaging container of the comparative example was used of a layer structure of an aluminum oxide deposited film (Toppan Printing GL-AEH, Ltd.) 12 [mu] m / stretched nylon film 15 [mu] m / cast polypropylene film 70 [mu] m.
The ratio shape of the packaging container of Comparative Examples 1 to 4 are standing pouch form, size Satoshi of 130 mm × 180 mm, fold height placed the sheet material 35mm as formation of the bottom surface. Further, Example 1 was a flat pouch and had a size of 130 mm × 120 mm.
250 g of curry containing ingredients was filled and sealed as the contents, and retort sterilization was performed at 121 ° C. for 30 minutes. A microwave oven of 1500 W was used.

  From the results shown in Table 1, the direction of the steam vent passage is inclined at a right angle with respect to the vertical direction of the storage section or a large slope close to a substantially right angle, and is opened by tearing by a band-shaped tear scheduled portion that intersects the steam vent passage. It was confirmed that an opening capable of well venting was obtained in the container.

It is explanatory drawing which shows an example of the packaging container for microwave ovens of examination technology . It is explanatory drawing which shows the state which opened the steam release channel | path in examination technology . It is explanatory drawing which shows an example of the packaging container for microwave ovens which concerns on this invention . In the example of this invention , it is explanatory drawing which shows the state which opened the steam release channel | path and the storage part has expanded by microwave irradiation heating. It is explanatory drawing which shows the steam removal structure in the comparative example 1. It is explanatory drawing which shows the steam removal structure in the comparative example 2. It is explanatory drawing which shows the steam removal structure in the comparative example 3. It is explanatory drawing which shows the steam removal structure in the comparative example 4.

DESCRIPTION OF SYMBOLS 1 ... Microwave oven cooking container 2, 2a ... Sheet material 3, 3a ... Sheet material 4 ... Sheet material 5 ... Storage part 6 ... Upper side seal part 7 ... Side seal part 8 ... Steam release means 9 ... Steam release passage DESCRIPTION OF SYMBOLS 10 ... Band-like torn part 11 ... Heat seal part 12 for channel | path formation ... Incision 13 ... Knob 14 for tearing ... Folded part 15 ... Heat seal part

Claims (1)

A microwave oven cooking packaging container in which a side portion of a sheet material is heat-sealed to seal a storage portion of the contents,
Two heat seal parts are arranged close to the upper part of the storage part that becomes a bulge space above the stored item during microwave irradiation heating, and a steam vent passage is formed between the heat seal parts by overlapping sheet materials. , The direction of the steam vent passage is inclined with respect to the vertical direction of the storage portion,
In addition, a notch is made to penetrate through one of the heat seal portions located in the vicinity of the steam release passage, and a band-like torn portion is formed to cut each of the sheet material between the two heat seal portions with the notch being a starting end. ,
The steam vent passage and the belt-like tearing-scheduled portion are arranged so as to cross each other, and the storage portion communicates with the outside through the steam vent passage opened by the tearing of the belt-like tear-off scheduled portion, and has a steam venting means. ,
The container body is made of a sheet material for forming the sheet material and the container bottom surface to form a container top, said the container top, the corrugation is provided formed by folding the sheet material forming the container top surface, wrapping the corrugation A packaging container for cooking by heating in a microwave oven, wherein the steam venting means is located in a part.

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