JP4260468B2 - Self-supporting microwave packaging bag - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a microwave oven packaging bag in which cooked items such as Chinese cooking utensils and curry can be heated in a microwave oven.
[0002]
[Prior art]
Conventionally, as a packaging bag for a microwave oven of this type, a back-pasted part (a superposition projecting outwardly by superposing the inner surfaces of the films and bonding a predetermined part to one of a pair of opposing wall surfaces What has a protrusion part) is well-known. When food to be cooked such as Chinese cooking utensils or curry is stored in the packaging bag and heated in a microwave oven, steam is generated from the food to be cooked, and the pressure inside the bag increases. In order to prevent the bag from rupturing due to the increase in the internal pressure, the back sticking portion is provided with a pressure discharge portion for releasing the generated steam to the outside and preventing an excessive pressure increase.
[0003]
By the way, these conventional packaging bags for microwave ovens are heated in a state where they are laid sideways with the back pasting portion facing up. When heated in a microwave oven, the internal pressure rises and the bag swells up, but since the pressure discharge part is provided in the back-pasted part located at the top of the bag, the steam is discharged smoothly, and the bag itself is sideways. Since it is relatively stable, there is little risk of the cooked product leaking out of the pressure discharge section.
[Patent Document 1]
Japanese Patent Laid-Open No. 11-130159
[Problems to be solved by the invention]
However, generally, when heating in a microwave oven, the heating efficiency is better in the vertical placement than in the horizontal placement. That is, it is said that the heating efficiency is poor in the vicinity of the placement surface on which the object to be heated inside the microwave oven is placed. Therefore, from the viewpoint of heating efficiency, a vertically placed type, that is, a standing type packaging bag having self-supporting properties is more desirable than the horizontally placed type described above.
[0005]
In view of this, a packaging bag in which a conventional horizontal packaging bag has a self-supporting form was considered. That is, a backpacking portion having a pressure discharge portion is provided on one of a pair of front and rear wall surfaces to obtain a self-supporting microwave packaging bag. However, the standing type has a structural problem that the probability of falling is higher than that of the horizontal type. In particular, as described above, the bag expands during heating and tends to be more unstable than normal, so the possibility of falling is increased. In the unlikely event that the product falls to one wall side (the side with the pressure discharge part) during heating, there is a risk that the product to be cooked will leak from the pressure discharge part or the pressure discharge part may be blocked and the bag may burst. Arise.
[0006]
Then, this invention makes it a subject to provide the packaging bag for microwave ovens which has the high heating efficiency by a microwave oven, and has the self-supporting property which can heat reliably even if it falls down at the time of a heating.
[0007]
[Means for Solving the Problems]
The present invention has been made to solve the above problems, and one aspect of the packaging bag for a microwave oven having self-supporting properties according to the present invention has a pair of front and rear wall surfaces and a bottom surface, which are opposed to each other. In the microwave oven packaging bag having a self-supporting property provided with a pressure discharge part for releasing the pressure inside the bag at the time of heating by the pressure discharge part is provided on one wall surface of the pair of front and rear walls facing each other, The wall surface is extended below the other wall surface .
[0008]
Since the microwave packaging bag having such a structure has a self-supporting property, it can be heated by being placed on the microwave oven placing surface in a vertically placed state. Without heating. Further, in terms of increasing self stability during heating, because it is possible to have in the manufacturing simple configuration to prevent reliably fall into one wall side, the side opposite to the pressure discharge portion in the unlikely event fall Will fall over. Therefore, even if it collapses during heating, the pressure discharge part is placed on the lower side and closed, resulting in the bag rupturing, or the food to be cooked inside leaks from the pressure discharge part on the lower side. This is prevented. Furthermore, both wall surfaces can be made of the same film.
[0009]
Another aspect of the microwave oven packaging bag according to the present invention has a pair of front and rear wall surfaces and a bottom surface, which are opposed to each other, and has a pressure discharge part for releasing the pressure inside the bag when heated by the microwave oven. In the microwave oven packaging bag provided with self-supporting property, the pressure discharge part is provided on one wall surface of the pair of front and rear wall surfaces facing each other, and the rigidity of the film constituting the other wall surface during heating by the microwave oven is It is characterized by being smaller than the rigidity of the film which comprises one wall surface.
[0010]
Even in the microwave packaging bag having such a configuration, since it is self-supporting, it can be placed and heated on the microwave oven mounting surface in a vertically placed state, and therefore more efficiently uneven than a horizontally placed bag. Without heating. Further, the rigidity of the film constituting the other wall surface at the time of heating by microwave, smaller than the stiffness of the film constituting the one wall, in the unlikely event fall to fall on the opposite side of the pressure discharge portion Become. Therefore, even if it collapses during heating, the pressure discharge part is placed on the lower side and closed, resulting in the bag rupturing, or the food to be cooked inside leaks from the pressure discharge part on the lower side. This is prevented. Furthermore, by adjusting the thickness, softening point, etc., it is possible to adjust the delicate control of the ease of falling, and the degree of freedom in design is high.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a microwave oven packaging bag having self-supporting property according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a microwave oven packaging bag according to the present embodiment in a state in which an item to be cooked is accommodated.
[0012]
The packaging bag is a so-called standing pouch, and includes a front wall surface 1 and a rear wall surface 2 that face each other, and a bottom gusset 3 that is folded upward between the front and rear wall surfaces 1 and 2 to form the bottom surface of the packaging bag. ing. The packaging bag is formed in a substantially rectangular shape or the like when viewed from the front. FIG. 1 shows a packaging bag formed in a substantially trapezoidal shape that tapers upward in order to improve self-supporting properties. In addition, the front wall surface 1, the rear wall surface 2, and the bottom gusset 3 are each composed of separate packaging films, and a total of these three packaging films are bonded to each other by heat sealing to form a sealed bag shape. However, the front wall surface 1, the rear wall surface 2, and the bottom gusset 3 may be formed by a single film, and the number of packaging films and the like can of course be changed as appropriate. In FIG. 1, the portion formed by heat sealing is shown by cross hatching. Moreover, the accommodation space part 4 in which to-be-cooked goods are accommodated from the front wall surface 1, the rear wall surface 2, and the bottom gusset 3 is formed.
In addition, as a packaging film, for example, a biaxially stretched polyester film or a biaxially stretched nylon film is used as a base material, and a laminated film of two or more layers provided with a sealant layer made of polyethylene or polypropylene resin as the innermost layer is used. .
[0013]
Further, a back pasting portion 5 is provided on one of the front and rear wall surfaces 1 and 2. In the present embodiment, the side on which the back pasting portion 5 is provided is referred to as the front wall surface 1 for explanation. The back pasting portion 5 is formed along the lateral direction (horizontal direction) in the upper portion of the front wall surface 1. The back pasting portion 5 is formed by overlapping the inner surfaces of the packaging film constituting the front wall surface 1 in the vertical direction (vertical direction) in the vertical direction (vertical direction) with a predetermined length and adhering them by heat sealing. That is, the back pasting portion 5 is formed over the entire width of the front wall surface 1 and protrudes forward. However, the front wall surface 1 may be composed of two upper and lower packaging films, and the end portions of both packaging films may be overlapped to form the back pasting portion 5 in the form of a palm.
[0014]
The back sticking part 5 has the adhesion part 6 to which the inner surfaces of the packaging film were adhere | attached, and the non-adhesion part 7 which is not adhere | attached. The adhesion part 6 is provided in the right and left both ends and the front-end | tip part of the back sticking part 5 so that the non-adhesion part 7 may be enclosed from three directions, and is formed in the substantially U shape as a whole. Therefore, the non-bonding part 7 communicates with the accommodation space part 4.
[0015]
In addition, the adhesive portion 6 has an extended convex portion 8 that extends from the distal end portion toward the proximal end portion at substantially the center in the width direction of the back pasting portion 5. A hole 9 penetrating vertically through the double packaging film of the back pasting portion 5 is formed in the extended convex portion 8 as a pressure discharge portion. At the normal time before heating, as shown in FIG. 3 (a), the back pasting portion 5 is in a flat state, but when heated by a microwave oven, the pressure in the accommodation space portion 4 is increased by the steam generated from the cooked product. As a result, first, as shown in FIG. 3B, the inner surfaces of the packaging film are separated from each other in the non-bonding portion 7 in the back pasting portion 5. When the packaging film bulges in the non-adhesive portion 7 of the back pasting portion 5 so as to be pulled up and down, the adhesive portion 6 has a peeling action, and the peeling force concentrates on the extended convex portion 8. When the pressure gradually rises as a result of heating, the extended convex portion 8 is finally peeled off, and the accommodating space portion 4 communicates with the outside through the non-adhesive portion 7 and the hole 9 of the back pasting portion 5. As a result, the vapor escapes from the hole 9 to the outside, and an excessive pressure rise is prevented, and the heat treatment ends without rupture. In addition, what made the adhesive force of the extension convex part 8 weaker than another part so that the extension convex part 8 may peel easily is preferable.
[0016]
Further, since the microwave oven packaging bag is self-supporting as described above, the present invention is devised which is not found in the conventional horizontal type. That is, as a countermeasure in the event of overturning when heated by a microwave oven, as shown in FIG. 2, the center part in the width direction of the front wall surface 1 is lower than the rear wall surface 2 in a state in which the food to be cooked is not accommodated. It is formed to be long.
As shown in FIG. 5, when the lower edge portions 111 and 112 in the center portions in the width direction of the front and rear wall surfaces 101 and 102 are at the same position, the bottom gusset 103 is From the folded state to the opened state, the central portions 111a and 112a of the lower edge portions 111 and 112 are separated from the placement surface F upward. For this reason, the packaging bag comes into contact with the mounting surface F only at one of the lower edge portions 111 and 112 and both the left and right corner portions 111b and 112b, and therefore, the packaging bag becomes extremely unstable. Moreover, since the bag expands further during heating, it becomes even more unstable. In the event of a fall, it will fall with approximately the same ease of fall on either side.
[0017]
On the other hand, in this embodiment, it is set as the structure which extended below the rear wall surface 2 the front wall surface 1 which has the back pasting part 5 like FIG. That is, in order to ensure independence, the left and right corner portions 11b, 12b of the lower edge portions 11, 12 of the front and rear wall surfaces 1, 2 are set at the same position, but the lower edge portion 11 of the front wall surface 1, The left and right corners 11b gradually bulge downward toward the central portion 11a. Therefore, in the state where the product to be cooked is accommodated, the distance from the mounting surface F in the central portion 11a of the lower edge portion 11 of the front wall surface 1 is reduced, and preferably the lower edge portion of the front wall surface 1 as shown in FIG. 11 The entire surface is in contact with the mounting surface F. Therefore, the self-supporting stability in the accommodated state of the cooked product is increased, and in particular, the stability during heating is improved. And only the front wall surface 1 extends downward, and the lower edge 12 of the rear wall 2, particularly the central portion 12 a thereof, is in a vertical posture with a large distance from the mounting surface F, or Since the lower edge portion 12 of the rear wall 2 is in a backward inclined posture in contact with the placement surface F, the ease of falling to the front side is smaller than that to the rear side. That is, even if it falls down during heating, it will not fall down to the front side but will fall to the back side. Therefore, even if it falls down, the back sticking part 5 is located in the upper part of a packaging bag, and there is no possibility that the hole 9 will be blocked | closed or a to-be-cooked item will leak.
[0018]
Although it is possible to extend not only the front wall surface 1 downward but also the rear wall surface 2 downward, even in that case, the front wall surface 1 is extended longer to prevent the front wall 1 from falling down. To do. In the above embodiment, the shape gradually bulges downward from the left and right corners 11b toward the central portion 11a. However, the shape is arbitrary, for example, only the central portion 11a protrudes downward. In any case, a part of the front wall surface 1 is extended relatively downward as compared with a part of the rear wall surface 2 to prevent the front wall from falling down.
[0019]
Further, as another countermeasure in the event of a collapse during heating, the rigidity of the packaging film constituting the rear wall surface 2 is made smaller than the rigidity of the packaging film constituting the front wall surface 1. As a configuration for reducing the rigidity in this way, the thickness and softening point of the packaging film may be varied. That is, the packaging film (for example, the base material) on the rear wall surface 2 is made thinner than that on the rear wall surface 2, or the softening point of the rear wall surface 2 (for example, the softening point of the base material) is changed by changing the packaging film material back and forth. Is low. With these configurations, the rigidity of the rear wall surface 2 is reduced during heating, and thus the ease of falling to the rear side is increased compared to that on the front side.
[0020]
In addition to the two countermeasures described above, various countermeasures such as a configuration in which the rear wall surface 2 contracts in the vertical direction relative to the front wall surface 1 when heated can be easily tilted backward. Yes, and two or more measures may be combined.
[0021]
Moreover, although the structure which provided the hole 9 as a pressure discharge part was illustrated, the structure of a pressure discharge part can be changed variously, such as the structure which cuts a part of the back sticking part 5 before heating, and forms a vapor | steam discharge port It is. Moreover, although the structure which provided the back pasting part 5 was illustrated, you may provide a pressure discharge part in one wall surface without providing the back pasting part 5. Examples of such a pressure discharge section include Japanese Patent Laid-Open Nos. 10-310181, 11-130159, 2000-25850, 9-150864, 9-142541, There are those described in Japanese Utility Model Laid-Open Nos. 62-125766, 5-58670, 10-177561, and 10-310180.
[0022]
【The invention's effect】
As described above, since it is self-supporting, it has better heating efficiency than the conventional horizontal type, and even if it collapses during heating, it collapses to the side without the pressure discharge part, so the bag may rupture or Heating can be ensured without leaking the contents to the outside.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a microwave packaging bag according to an embodiment of the present invention.
FIG. 2 is a vertical cross-sectional view of the packaging bag, showing a state in which an item to be cooked is not accommodated.
3 is an enlarged view of part A of FIG. 2, in which (a) shows a state in which an item to be cooked is not accommodated, (b) shows an initial state during heating, and (c) shows further heating. The figure which shows each state.
FIG. 4 is a vertical cross-sectional view of the main part of the packaging bag, showing a state in which an item to be cooked is stored.
FIG. 5 is a longitudinal sectional view of a main part corresponding to FIG. 4 of a conventional standing pouch.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Front wall surface, 2 ... Rear wall surface, 3 ... Bottom gusset, 4 ... Storage space part, 5 ... Back sticking part, 6 ... Adhesion part, 7 ... Non-adhesion part, 8 ... Extension convex part, 9 ... Hole (pressure) Discharge part), 11, 12 ... lower edge part

Claims (2)

In a microwave oven packaging bag having a self-supporting nature, having a pair of front and rear wall surfaces and a bottom surface facing each other, and provided with a pressure discharge part for releasing the pressure inside the bag when heated by a microwave oven,
A packaging bag for a microwave oven having self-supporting characteristics, wherein a pressure discharge portion is provided on one wall surface of a pair of front and rear wall surfaces facing each other, and one wall surface extends below the other wall surface. . In a microwave oven packaging bag having a self-supporting nature, having a pair of front and rear wall surfaces and a bottom surface facing each other, and provided with a pressure discharge part for releasing the pressure inside the bag when heated by a microwave oven,
A pressure discharge part is provided on one wall surface of the pair of front and rear wall surfaces facing each other, and the rigidity of the film constituting the other wall surface during heating by the microwave oven is smaller than the rigidity of the film constituting the one wall surface. A packaging bag for microwave ovens having the characteristic self-supporting property.

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