JP4090724B2 - Packaging bag for microwave oven with pressure adjustment function - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a packaging bag that automatically evacuates air in a bag when the pressure in the bag exceeds a predetermined pressure during cooking.
[0002]
[Prior art]
In recent years, cooked foods that can be eaten easily and in a short time simply by heating in a microwave oven are increasing in the market.
If a packaging bag filled with such food and hermetically sealed is heated as it is, the packaging bag will explode due to steam generated by heating. Therefore, the following means have been devised to release the generated steam to the outside of the bag.
(1) A cut or a hole is made in advance (Japanese Patent Laid-Open No. 2000-72187).
(2) A portion having a weak seal strength is formed (Japanese Patent Laid-Open No. 9-142541).
(3) Use an easy peel film (Japanese Patent Laid-Open No. 10-211972).
[0003]
[Problems to be solved by the invention]
In the case of (1), it is troublesome to make a cut or make a hole in advance, and there is a possibility of forgetting the operation and heating the microwave oven. At that time, the pouch explodes and it is very dangerous.
In the case of (2), since there is a part where the sealing strength is partially weak, there is a possibility that the bag will be broken during transportation and storage.
In the case of (3), it is possible to extract the steam by the pressure of the steam, but since the width of the opening cannot be controlled, the microwave oven with a high output opens greatly and makes a sound or the contents are scattered. The chamber may become dirty or burns may occur.
In order to improve these problems, a wing portion is provided in the packaging bag, the wing is solid-sealed, and a notch or an unsealed portion is provided in the solid seal, thereby causing the seal to recede by steam generated by heating, so that There has also been proposed a method for preventing the bag from bursting by dissipating steam from the seal portion.
By this method, there is no risk of rupturing of the packaging bag due to heating by a microwave oven, but there is a risk of damaging the packaging material because the heat capacity is large by sealing a large area. In addition, when the amount of steam generated is large, the steam is opened instantaneously, and adjustment may not be possible when the contents are to be steamed. On the other hand, there is a problem that it takes time to retract the seal to the notch or unsealed portion provided in the seal portion and to retract to the steaming portion.
The objective of this invention is providing the packaging bag which can heat the microwave oven, adjusting the pressure of the food etc. with which the packaging bag was filled stably.
[0004]
[Means for Solving the Problems]
The above problems can be solved by the following invention. That is, the invention described in claim 1 is a bag for heating by a microwave oven, using a composite film having at least one surface made of a heat seal layer, and a lower member having a heat seal surface as an upper surface, A wing part is formed in which the heat seal surfaces face each other and the side part and the tip side part are sealed, and the upper member with the heat seal surface as the lower surface is overlapped, and the peripheral part is heat sealed to form a main seal part The packaging bag to be sealed has means for discharging the vapor in the bag when the pressure in the bag reaches a predetermined pressure due to the steam generated by heating in the wing, and this discharging means heats the films in the wing. more surrounded by the plurality of vertical sealing portion connecting the bonded main seal portion formed by the leading edge seal portion and parallel to the transverse seal portion and the leading edge seal part and the lateral sealing portion And a non-sealing portion, Ri Do from蒸通unit provided to the person the non-sealing portion, and electrons with sealing width of the transverse seal portion, the pressure adjusting function, characterized in that in the range of 1mm~10mm It consists of a packaging bag for the range. The invention described in claim 2 is characterized in that the distance from the center of the packaging bag described in claim 1 to the inner end of the inner side of the lateral seal portion is shorter than the distance to the other inner end of the seal. It is. The invention described in claim 3 is characterized in that the ratio of the length from the end portion of the packaging bag to the wing portion described in claim 1 and from the wing portion to the other end portion is 2/3 or less. is there.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
The present invention includes a wing portion formed in a packaging bag, and a main seal portion formed by thermally bonding films in the region of the wing portion, a lateral seal portion parallel to the tip end seal portion, and the tip end seal portion. By providing a plurality of non-seal parts surrounded by a plurality of vertical seal parts connecting the horizontal seal parts and a steaming part such as a notch or a notch therein, the bag can be heated while being placed horizontally. It became possible to adjust the steam discharge by the amount of steam generated by heating according to the contents. Hereinafter, it will be described in detail with reference to the drawings.
[0006]
FIG. 1 is a diagram showing an embodiment of a packaging bag for a microwave oven having a pressure adjusting function according to the present invention, wherein (a) a perspective view, (b) an explanatory diagram of components of the packaging bag, and (c) a packaging bag is formed. It is sectional drawing which shows the layer structure of the laminated body to perform, (d) It is sectional drawing which shows another layer structure of the laminated body which forms a packaging bag. 2A and 2B are explanatory views when the microwave oven is heated using the microwave oven packaging bag having the pressure adjusting function of the present invention, and are (a) a perspective view and (b) an X1-X1 sectional view. FIG. 3 shows an example of the shape of the seal provided in the wing part. FIG. 4 is an explanatory diagram of the shape of a cut or notch that becomes a steaming part. FIG. 5 shows an example in which protrusions are provided on the seal part of the wing part. FIG. 6 is an explanatory diagram of the packaging bag used in the example.
[0007]
A wing portion is formed on one side of the bag, and the wing portion is surrounded by a horizontal seal portion parallel to the main seal portion and the distal end side seal portion, and a plurality of vertical seal portions connecting the distal end side seal portion and the lateral seal portion. In addition, a notch or notch serving as a steaming portion is formed in a plurality of non-sealed regions. When the pouch swells by heating, the seal peels and retreats (hereinafter referred to as seal retraction) by the heat and pressure, and steam escapes from the notch or notch. When heating in a microwave oven for eating, the seal retreats with the heat and pressure of the steam generated by the heating and does not need to be cut or drilled in advance. Vapor escapes and automatically opens, making it safe and convenient.
[0008]
In the microwave oven packaging bag having the pressure adjusting function of the present invention, as shown in FIG. 1 (a), a wing portion 4 is formed on one surface of the bag. The wing part 4 is formed by using a composite film having at least heat sealability, for example, as shown in FIG. 1B, the lower member 2 having the heat seal surface as the upper heat seal surface, and heat The upper members 3a and 3b facing each other are formed into a wing portion 4 in which the side portion and the tip side portion are sealed (main seal portion), and the upper member 3 with the heat seal surface as the lower surface is overlapped. The peripheral portion is heat sealed to form a main seal portion 5. As a formation position of the wing part 4, a / b is set to 2/3 or less. At 2/3 or more, it is difficult to apply pressure to the horizontal seal portion and the vertical seal portion , and there is a risk of bursting from other seal portions. The wing part may be a single member, in which case the tip side is folded.
[0009]
As shown in FIG. 1A, the wing formed in this way is provided with a vertical seal and a horizontal seal 6, and together with the main seal 5 of the wing, two or more main seals and vertical seals A non-seal portion 6e surrounded by the horizontal seal portion is formed.
[0010]
In the packaging bag for a microwave oven having a pressure adjusting function according to the present invention, the shape of the seal formed in the wing portion is the side seal portion of the wing portion and / or the side seal portion parallel to the tip side seal portion and the tip side seal portion. anterior end forming at least two or more non-sealed portion in the wing portion by a plurality of vertical seal portion for connecting the seal portion and the lateral sealing portion, provided蒸通portion of such notch 8 or notches 7 in the non-sealing portion and Is. The non-seal portion 6e surrounded by the seal portion may be surrounded by a quadrangle formed by a linear seal portion as shown in FIG. 1 (a), or FIG. 3 (a) to FIG. 3 (b). As shown in FIG. 5, the seal portion may be surrounded by a vertical seal portion formed by a curved or broken line-shaped seal portion and a straight horizontal seal portion . Further, the seal shape of the vertical seal portion may be a contrast type as shown in FIGS. 3 (c) to 3 (d).
[0011]
Furthermore, the horizontal seal portion is formed with a protruding portion 6t inside the 5 pouch as shown in FIG. 5 (a) so that the seal is easily retracted, or a part of the horizontal seal portion as shown in FIG. 5 (b). You may open as the non-seal part 6n.
[0012]
A notch 8 or a notch 7 is formed in a non-seal part 6e defined by a horizontal seal part parallel to the tip side seal part, a plurality of vertical seal parts 6 and the main seal part 5 connecting the tip side seal part and the horizontal seal part. And so on. The shape of the steaming part may be a notch 8 as shown in FIGS. 4 (a) to 4 (c) or a notch 7 as shown in FIG. 4 (d). The non-sealing part 6e surrounded by each sealing part may be provided with a steaming part having a different shape. The number of non-seal parts 6e surrounded by each seal part and the number of steaming parts are not particularly specified, and if the content has a large amount of steam, the number of steaming parts is increased or the area of the notch is increased. However, when the steaming effect is required, it can be dealt with by reducing the number of the steaming effect or reducing the area of the notch.
[0013]
As a package in which the bag formed in this manner is filled and sealed, when heated in a microwave oven in a sealed state, as shown in FIGS. 2 (a) to 2 (b), steam generated by heating is generated. The seal retreats 60 from the central portion of the lateral seal portion where the force is most likely to be applied by the heat and pressure of v, and the steam v escapes from the opening 9 where the notch 8 is widened.
As for the position of the lateral seal portion , in FIG. 1 (a), the radius of a circle inscribed in the side seal portion 5 of the bag centering on the center 1m of the bag is r1, and the inner portion of the lateral seal portion 6 is also centered on 1m. When the radius of the circle in contact is r2,
r2 ≦ r1
To be. When r2> r1, it is difficult to apply pressure to the lateral seal portion , and in some cases, there is a risk of bursting from another seal portion. By changing the width w1 of the seal portion of the horizontal seal portion 6, the communication time between the non-seal portion 6e and the inside of the bag can be adjusted by retreating the seal, and as a result, the ease of vapor removal can be controlled. For example, when the steaming effect is desired, the width w1 of the horizontal seal portion is widened. When the output is high and the internal pressure rapidly increases as in a commercial microwave oven, the width w1 of the seal portion of the horizontal seal portion is reduced. Yes. The width w1 of the horizontal seal portion is 1 mm to 10 mm, preferably 3 mm to 5 mm. If it is less than 1 mm, the strength is too weak and there is a risk of breaking the bag during transportation and storage. If it exceeds 10 mm, the seal is difficult to retreat, so that the pouch may be broken.
[0014]
As a film constituting the bag in the microwave oven packaging bag having the pressure adjustment function of the present invention, it may be formed only by a single film having heat sealability, but from the viewpoint of strength, heat resistance, content protection, etc. As shown in FIG.1 (c), it is preferable to use the laminated body which laminated | stacked the base material layer 11 and the sealant layer 13. As shown in FIG.
Here, the base material layer 11 may be a single layer or multiple layers, and is not particularly limited as long as it is used as a packaging material for food that is generally heated or cooked in a microwave oven.
For example, the base material layer 11 is a stretched polyethylene terephthalate film, silica-deposited polyethylene terephthalate film, alumina-deposited polyethylene terephthalate film, stretched nylon film, silica-deposited stretched nylon film, alumina-deposited stretched nylon film, stretched polypropylene film, polyvinyl alcohol-coated stretched polypropylene film Nylon 6 / metaxylenediamine nylon 6 co-extrusion co-stretched film or polypropylene / ethylene-vinyl alcohol copolymer co-extrusion co-stretched film can be used.
[0015]
As the sealant layer 13 in the microwave packaging bag having the pressure adjusting function of the present invention, those used as food packaging materials generally heated or cooked in a microwave oven can be used.
Specifically, low-density polyethylene film, ultra-low-density polyethylene film, linear low-density polyethylene film, medium-density polyethylene film, high-density polyethylene film, unstretched polypropylene film, ethylene-vinyl acetate copolymer film, ethylene-acrylic An acid copolymer film, an ethylene-methacrylic acid copolymer film, an ethylene-methyl acrylate copolymer film, an ethylene-ethyl acrylate copolymer film, an ethylene-methyl methacrylate copolymer film, an ionomer film, or the like can be used.
The thickness of the sealant layer is 20 to 100 μm, preferably 40 to 70 μm.
[0016]
In addition to the base material layer 11 and the sealant layer 13, the laminate constituting the bag of the microwave oven packaging bag having the pressure adjusting function of the present invention, as shown in FIG. The intermediate layer 12 may be laminated in order to improve barrier properties or strength.
[0017]
As a method of laminating the base material layer 11 and the sealant layer 13, or the base material layer 11, the intermediate layer 12, and the sealant layer 13, a conventionally known method such as extrusion lamination, co-extrusion lamination, or dry lamination can be used.
[0018]
【Example】
A bag as shown in FIG. 6 was made of a packaging material obtained by dry laminating a 12 μm thick alumina-deposited polyethylene terephthalate film, a 15 μm stretched nylon film, and a 60 μm unstretched polypropylene film. The dimensions of each part of the bag were as follows.
a = 50 mm, b = 120, a + b = 170 mm, c = 130 mm
r1 = 58mm, r2 = 35mm
w0 = 7mm, w1 = 4mm,
h = 25mm
Incision, 6mm in length, 2 places, 180g of curry in this packaging bag, heated in a 500W microwave oven, the seal retreats at the horizontal and vertical seals , and after about 2 minutes the incision 8 is the steaming part The steam escaped quietly.
[0019]
【The invention's effect】
The microwave oven packaging bag having a pressure adjusting function according to the present invention described above can completely maintain hermeticity at the distribution stage because the notch or notch that is the steaming portion is surrounded by the seal portion. Further, the packing bag, by forming a non-seal portion surrounded by the sealing portion, compared to Betashiru as point seal, heat capacity at seal requires less and less damage of the packaging material. Moreover, the instability of the seal strength due to air entrapment can be eliminated. When a filled food or the like is heated in a microwave oven, the distance for retreating the seal at the time of opening is short, so that the steam can be safely and reliably removed. In the present invention, all bag sizes, contents, and microwave output can be accommodated depending on the seal width of the horizontal seal part, the number of non-seal parts surrounded by the seal part , and the size and number of notches and notches. Vapor escapes from the upper part of the bag, so that even if the contents are liquid, it can be handled without spilling.
[Brief description of the drawings]
1A and 1B are diagrams showing an embodiment of a packaging bag for a microwave oven having a pressure adjusting function according to the present invention, wherein FIG. 1A is a perspective view, FIG. 1B is an explanatory diagram of components of the packaging bag, and FIG. It is sectional drawing which shows the layer structure of the laminated body to perform, (d) It is sectional drawing which shows another layer structure of the laminated body which forms a packaging bag.
[2] an explanatory view when the microwave heating using microwave packaging bag having a pressure adjusting function of the present invention, (a) a perspective view and a (b) X ₁ -X ₁ cross section.
FIG. 3 shows a shape example of a main seal portion provided in the wing portion, a horizontal seal portion parallel to the tip side seal portion, and a plurality of vertical seal portions connecting the tip side seal portion and the horizontal seal portion .
FIG. 4 is an explanatory diagram of the shape of a cut or notch that becomes a steaming part.
FIG. 5 shows an example in which protrusions are provided on the seal part of the wing part.
FIG. 6 is an explanatory diagram of a packaging bag used in an example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Packaging bag for microwave ovens having pressure adjustment function 2 Lower member 3 Upper member 4 Wing part 5 Main seal part 6 Vertical seal, Horizontal seal part 6o Seal retraction part 6t Protrusion part 6n Non-seal part 6e Main seal part and vertical seal part And a non-seal part 7 surrounded by the lateral seal part 7 notch 8 notch 9 opening 10 laminated body 11 forming a packaging bag 11 base material layer 12 intermediate layer 13 sealant layer 14 adhesive layer v steam

Claims (3)

A bag for heating by a microwave oven, using a composite film having at least one surface composed of a heat seal layer, a lower member having a heat seal surface as an upper surface, and a side portion facing the heat seal surfaces In a packaging bag that forms a wing part that seals the tip side part, overlaps the upper member with the heat seal surface as the bottom surface, heats the peripheral part and seals it as the main seal part, It has means for discharging the vapor in the bag when the pressure in the bag reaches a predetermined pressure due to the generated steam, and the discharge means is formed by thermally bonding the films in the wing part and the front end side. a plurality of unsealed portion surrounded by the plurality of vertical seal portion for connecting the seal portion and parallel to the transverse seal portion and the leading edge seal part and the lateral sealing portion, set to those the non-sealing portion And Ri Do from蒸通portion, and the seal width of the transverse seal portion, microwave packaging bag having a pressure adjusting function, characterized in that in the range of 1 mm to 10 mm. 2. The microwave oven packaging bag having a pressure adjusting function according to claim 1, wherein the distance from the center of the packaging bag to the inner end of the side of the lateral seal portion is shorter than the distance to the other inner end of the seal. . The ratio of the length from the packaging bag end portion to the wing portion and from the wing portion to the other end portion is 2/3 or less. Packaging bag for range.

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