JP2003155071A - Packaging bag for microwave oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag for a microwave oven which can heat the packaging bag of fluid food even in a horizontal condition when heating the food in the microwave oven, and prevent breakage of the bag by generated vapor even when opening of a sealing system has been forgotten. SOLUTION: In a packaging bag, a lower member 2 with a sealant surface as an upper side, and an upper member 3 with a sealant surface as a lower side which has a wing part 4 with a side part and a tip side part sealed by allowing to form the bag with the sealant surfaces facing each other in overlap of composite films with at least one side thereof formed of a sealant layer 13, and peripheral edge parts are sealed to form a main seal part. A point seat part is provided in an area of the wing part, and at least one easily-vapor- passing means is provided in this point seal part. In the point seal part, the radius of a circle with its center at the center part of a pouch in contact with the lowest end of the point seal part from the center of the pouch is smaller than the radius of a circle in contact with an inner edge of the side seal part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag in which food is hermetically sealed and can be heated in a microwave oven in a sealed state.

[0002]

2. Description of the Related Art When a microwave oven is used to heat or cook food that is hermetically packaged in a packaging bag or the like, if the packaging remains sealed, the steam generated by heating causes the system It is well known that the internal pressure of the product rises, and eventually the packaging bag bursts and the contents are scattered in the microwave oven. Various methods are known to prevent the rupture of such a bag. The microwave packaging container has a notch in the side seal portion in order to allow steam generated from food to escape to the outside of the packaging container by heating. (Actual climb 3048
391) (2) Precuts and holes are made. (Japanese Patent Laid-Open No. 2000-72187) and the like.

[0003]

However, in the case of the above (1), if the contents stored in the packaging bag are foods such as liquids having fluidity, they are spilled and cannot be used. Also,
In the case of (2), the work such as making a notch and making a hole in advance is troublesome, and there is a possibility of forgetting the work and heating in the microwave oven, at which time the bag explodes, which is very dangerous. An object of the present invention is to heat a fluid food as a content sealed in a bag in a microwave oven so that the bag can be placed horizontally and heated, and the sealing system can be opened. It is an object of the present invention to provide a packaging bag for a microwave oven, which can prevent the bag from bursting due to generated steam even if it is not used.

[0004]

The above-mentioned problems can be solved by the following inventions. That is, the invention described in claim 1 is a bag for heating by a microwave oven, which uses a composite film having at least one surface composed of a sealant layer, and a lower member having a sealant surface as an upper surface, and a sealant surface. In a packaging bag in which a wing portion is formed by facing each other to seal a side portion and a tip side portion, and an upper member having a sealant surface as a lower surface is overlapped, and a peripheral portion thereof is sealed to be a main seal portion. , A point seal part is provided in the area inside the wing part, and at least one or more easily vaporizing means are provided in the point seal part, and the point seal part is a circle centered on the center part of the bag. When drawing, the radius of the circle that touches the bottom edge of the point seal part from the center of the bag is shorter than the radius of the circle that touches the inner edge of the side seal part. It consists of a microwave packaging bag, wherein a. The invention described in claim 2 is characterized in that an unsealed portion is formed inside the point seal portion described in claim 1. The invention described in claim 3 is characterized in that a pattern seal part is formed inside the point seal part described in claim 1. The invention described in claim 4 is characterized in that the easily vaporizable means according to any one of claims 1 to 3 is a cutting blade or a notch. In the invention described in claim 5, at least one cutting edge provided in the point seal part according to any one of claims 1 to 4, the distance between the lowermost end of the notch and the lower end part of the point seal part is It is characterized by being 3 to 10 mm. According to the invention described in claim 6, the ratio of the length from the end of the packaging bag to the wing portion and the length from the wing portion to the other end of the packaging bag according to any one of claims 1 to 2 is 2/3. It is characterized by the following.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, a wing portion is provided on a packaging bag, and a point seal portion and an easily vaporizable means such as a notch or notch in the point seal portion are provided in the area of the wing.
When drawing a circle centered on the center of the bag, make it so that the radius of the circle that touches the bottom edge of the point seal from the center of the bag is shorter than the radius of the circle that touches the inner edge of the side seal. This makes it possible to heat the bag while it is placed horizontally, and even if the microwave oven is heated without forgetting to provide a steam escape port, the steam generated by the heating causes the seal retreat of the point seal part and the easy steaming means. The feature is that the steam can be released to the outside of the bag without causing the bag to burst by.

1A and 1B are views showing an embodiment of a packaging bag for a microwave oven according to the present invention. FIG. 1A is a perspective view, FIG. 1B is an explanatory view of the structure of the packaging bag, and FIG. 1C is a sectional view taken along line X ₁ -X _1. Figures, (d) and (e)
It is a sectional view showing an example of layer composition of a layered product which forms a packaging bag. FIG. 2 is an explanatory view of a point seal part of the packaging bag for a microwave oven of the present invention, in which (a) a solid seal point seal part, (b) an unsealed part,
(C) A point seal part having a pattern seal part formed thereon,
(D) An example in which the point seal portion is provided with a notch, and (e) An example in which the point seal portion is provided with a notch. FIG. 3 is a view for explaining the position of the easily steaming means in the packaging bag for a microwave oven according to the present invention. FIG. 4 is a diagram showing the position of the easily steaming means in the point seal portion. Figure 5
It is explanatory drawing of the guide seal part of the wing part in the packaging bag for microwave ovens of this invention. 6 to 8 are explanatory views of the packaging bag in Examples and Comparative Examples.

The packaging bag 1 for a microwave oven according to the present invention is shown in FIG.
As shown in (a), the bag has a wing portion 4 on one surface thereof. The microwave oven packaging bag of the present invention can be heated in a microwave oven with the surface provided with the wing portion 4 as the upper surface. The inside of the wing portion 4 is shown in FIG.
As shown in (a) to FIG. 2 (c), the point seal part 6 and the steam releasing means 7 or 8 are provided, and when heating,
Even if the steam escape port is not formed in advance, the heat and pressure of the steam generated by the microwave heating causes the seal part of the point seal part 6 to separate and retreat, and the steam is diffused from the steam release means 7 or 8 to the outside of the bag. It is something that is done.

The packaging bag 1 for a microwave oven according to the present invention is shown in FIG.
As shown in FIGS. 1 (a) to 1 (c), a wing portion 4 is provided in a portion located at an upper portion when the bag is placed on a flat surface, and a point seal portion 6 is provided in a region of the wing portion 4. 2A to 2C, the notch 7 or the inside of the point seal portion 6 is provided as shown in FIGS.
By forming the easily vaporizable means such as the notch 8 as shown in (f), the point seal portion 6 is separated and retracted by the heat and pressure of the steam generated by heating, and the easily vaporized means 7 or 8 is removed. Since the steam is dissipated, it can be opened naturally, preventing the bags from breaking. Since the packaging bag 1 of the present invention can be placed in a horizontal position with the wing portion 4 facing upward and can be heated in a microwave oven, it can be used for foods having fluidity. That is, when heating with a microwave oven, even if a cut is not made in advance, the seal retracts and steam escapes from the cut or notch, and the seal is automatically opened, which is safe and convenient. Further, since the notch 7 or the notch 8 is inside the pattern seal portion of the point seal portion, it is possible to completely maintain the hermeticity at the distribution stage.

In addition to the point seal portion 4, the wing portion 4 may be provided with a guide seal portion 5G for facilitating opening as shown in FIG. 5 (a) or 5 (b).

The packaging bag 1 for a microwave oven of the present invention uses a plastic film having a sealant layer on at least one side thereof, and is shown in FIGS. 1 (a), 1 (b) and 1
As shown in (c), the lower member 2 having the sealant layer 13 as the upper surface and the wing portion 4 in which the sealant layers 13a and 13b are opposed to each other are formed, and the upper member having the sealant layer 13 surface as the lower surface is overlapped. A packaging bag in which a main seal portion 5 is sealed by sealing the peripheral portion thereof, and a point seal portion 6 as illustrated in FIGS. 2 (a) to 3 (c) is provided on the wing portion. Is provided. The point seal portion 6 may be a solid seal as shown in FIG. 2 (a), an unsealed portion 6N may be provided inside as shown in FIG. 2 (b), or FIG. 2 (c). As shown in, the pattern seal portion 6P may be provided inside.

As an easily vaporizable means formed inside the point seal part, it is sufficient that the steam can be released outside the bag when the point seal part 6 is peeled and retracted due to the heat of the steam and the rise of the internal pressure. The notch 7 as shown in FIG. 2D may be used, or the notch 8 as shown in FIG. 2E may be used.

Further, as shown in FIG. 4, the distance d between the lower end portion of the easily steaming means (an example of a cut shown in FIG. 4) provided in the point seal portion 6 and the lower end portion of the point seal portion 6 is 3 to 10.
The range is mm, preferably 5-8 mm. The distance d
Is less than 3 mm, the strength against vibration, drop, etc. is weakened, and there is a possibility that the bag may be broken during the distribution of the product.
If it is larger than 10 mm, vapor escape is unlikely to occur, and bag breakage from other seal parts may occur.

As shown in FIG. 3A, when the point seal portion 6 is formed in a circle centered on the center of the packaging bag, the bottom end of the point seal portion 6 is located from the center of the packaging bag. Is provided at a position such that the radius r ₂ of the circle in contact with is smaller than the radius r _{1 of the} circle in contact with the inner edge of the side seal portion. When the radius r ₂ is longer than the radius r ₁ , peeling back of the seal portion due to heat of steam generated by heating and increase in internal pressure results in peeling at the side seal portion of the packaging bag, resulting in breakage of the packaging bag and contents. May leak.

The position of the wing portion provided in the packaging bag for a microwave oven of the present invention is preferably a / b shown in FIG. 1 (a) at 2/3 or less. If it is larger than this, the point seal portion 6 provided at the wing portion is located. , The force of peeling back is not applied well and automatic opening is not achieved.

Next, the laminated body 10 forming the packaging bag 1 for a microwave oven of the present invention will be described. The packaging bag 1 may be formed of a single plastic film having a heat-sealing property, but in view of strength as a bag, heat resistance, and protection of contents, as shown in FIG. It is preferable to use a laminate including the base material layer 11 and the sealant layer 13.

As shown in FIG. 1D, the laminated body 10 is formed into a bag by using the laminated body 10 including at least a base material layer 11 and a sealant layer 13. Further, FIG. 1 (e)
As shown in FIG. 5, the intermediate layer 12 may be disposed between the base material layer 11 and the sealant layer 13 to form the laminated body 10. The laminated body 10 may be one in which the layers of the laminated body constituting the laminated body 10 are laminated with an adhesive layer 14 made of an adhesive or an adhesive resin interposed therebetween.

The base material layer 11 of the laminate 10 forming the packaging bag for a microwave oven of the present invention is not particularly limited as long as it is generally used as a food packaging material that is heated or cooked in a microwave oven. .

Here, the base material layer 11 may be a single layer or a multilayer (laminated), and those generally used as food packaging materials that are heated or cooked in a microwave oven can be used. For example, stretched polyethylene terephthalate film, silica vapor deposition stretched polyethylene terephthalate film, alumina vapor deposition stretched polyethylene terephthalate film, stretched nylon film, silica vapor deposition stretched nylon film, alumina vapor deposition stretched nylon film,
Stretched polypropylene film, polyvinyl alcohol coated stretched polypropylene film, nylon 6 / meta-xylylenediamine nylon 6 co-pushed co-stretched film, polypropylene / ethylene-vinyl alcohol copolymer co-pushed co-stretched film, or two or more of these It may be a composite film in which the above films are laminated.
These base material layers 11 usually have a melting point of 150 ° C. or higher and a thickness of 1
It is 0 to 50 μm, preferably 10 to 30 μm.

As the resin constituting the sealant layer 13 in the present invention, those which are generally used as food packaging materials which are heated or cooked in a microwave oven can be used. As the sealant layer 13, for example, low density polyethylene, ultra low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene,
Unstretched polypropylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-methyl methacrylate A resin such as a copolymer or an ionomer can be used. The sealant layer may be formed by extrusion laminating these resins. Alternatively, a film formed by a T-die method or an inflation method in advance may be laminated with a heat resistant base material layer by a dry laminating method or an extrusion laminating method. May be. The thickness of the sealant layer in the packaging material for a microwave oven of the present invention is 20.
˜100 μm, preferably 40-70 μm.

The lamination of the base material layer 11 and the sealant layer 13 is not particularly limited as long as it is a conventionally known method such as a coextrusion laminating method or a dry laminating method.

An intermediate layer 12 may be provided as a packaging material in the laminate 10 forming the packaging bag 1 for a microwave oven of the present invention for mechanical strength such as barrier property and puncture resistance. The intermediate layer 12 is not particularly limited as long as it is generally used as a food packaging material that is heated or cooked in a microwave oven. Examples of the material used for the intermediate layer 12 include those exemplified as the base material layer 11.

As described above, since the microwave packaging bag 1 of the present invention has the wing portion 4 provided on the upper portion of the bag, even if the packaging bag contains the liquid, the wing is not heated when the microwave oven is heated. The bag can be placed horizontally with the part facing up. Further, by forming the steam escape port in the upper portion of the wing portion, the bag can be stably and sufficiently heated without rupturing, and the fluid food can be spilled.
Further, even if the vapor escape port is not formed in advance, the point seal and the easy vaporization means of the present invention can heat the bag without rupturing it.

[0023]

<Example 1> A bag as shown in Fig. 6 was prepared from a packaging material in which an alumina-deposited polyethylene terephthalate film having a thickness of 12 µm, a stretched nylon film having a thickness of 15 µm and an unstretched polypropylene film having a thickness of 60 µm were dry laminated. The dimensions of each part shown in FIG. 6 are as follows: a ₁ = 50 mm, b ₁ = 150 mm, c ₁ = 150 mm, r ₁ = 65 mm, r ₂ = 55 mm, w ₁ = 10 mm, w ₂ = 5 mm, w ₃ = 15 mm Curry was put in this packaging bag and heated in a 500 W microwave oven. As a result, steam was gently released from the slit portion after about 2 minutes. There was no spillage because it came out from the top of the bag.

<Comparative Example 1> A bag was produced in the same manner as in Example 1, except that the point seal portion was not provided with an easily vaporizable means. Curry was put in this packaging bag, a cut was made at a predetermined place, and it was heated in a 500 W microwave oven. As a result, the side seal part broke, a loud noise exploded, and the contents were scattered. <Comparative Example 2> A bag was produced in the same manner as in Example 1 except that the size of the bag was as shown in FIG. The dimensions of each part shown in FIG. 7 are as follows: a ₂ = 100 mm, b ₂ = 100 mm, c ₂ = 150 m
m, r ₁ '= 65 mm, r ₂ ' = 5 mm, w ₁ = 10 mm, w ₂ = 5 mm, w ₃ = 15 mm Put curry in this packaging bag, make a notch in the specified place, and heat in a 500 W microwave oven As a result, the side seal part broke, exploded with a loud noise, and the contents were scattered. <Comparative Example 3> A bag was produced in the same manner as in Example 1 except that the size of the bag was as shown in FIG. The dimensions of each part shown in FIG. 8 are as follows. a ₃ = 30 mm, b ₃ = 170 mm, c ₃ = 150 mm, r ₁ ″ = 65 mm, r ₂ ″ = 75 mm, w ₁ = 10 mm, w ₂ = 5 mm, w ₃ = 15 mm Curry is put in this packaging bag and prescribed As a result of making a notch in the place and heating with a 500 W microwave oven, the side seal part broke, a loud noise exploded and the contents were scattered.

[0025]

EFFECTS OF THE INVENTION The microwave packaging bag of the present invention is provided with a wing portion on one side of the bag. Therefore, when the microwave oven is heated, the wing portion may be placed sideways and heated. Yes, because the steam escape port is on the top,
There is no risk of spilling the contents. Furthermore, the contents stored in a hermetically sealed packaging bag, when heated in the microwave, in advance, without performing the opening for steam escape, by the automatic steaming function provided in the packaging bag for the microwave oven of the present invention, The generated steam gently diffuses outside the bag, so there is no risk of the bag bursting during heating.

[Brief description of drawings]

1A and 1B are views showing an embodiment of a packaging bag for a microwave oven according to the present invention, in which FIG. 1A is a perspective view, FIG.
(C) X ₁ -X ₁ part cross-sectional view, a cross-sectional view showing an example of the layer constitution of the laminate forming the (d) and (e) packaging bag.

FIG. 2 is an explanatory view of a point seal portion of the packaging bag for a microwave oven of the present invention, (a) a solid seal point seal portion,
(B) Point-sealed portion having an unsealed portion, (c)
Point seal part having a pattern seal part, (d)
An example in which a notch is provided in the point seal portion, and (e) an example in which a notch is provided in the point seal portion are shown.

FIG. 3 is a view for explaining the position of the easily steaming means in the packaging bag for a microwave according to the present invention.

FIG. 4 is a diagram showing a position of an easily steaming means in a point seal portion.

FIG. 5 is an explanatory view of a guide seal portion of a wing portion of the packaging bag for a microwave oven according to the present invention.

FIG. 6 is an explanatory diagram of a packaging bag in an example.

FIG. 7 is an explanatory diagram of a packaging bag in a comparative example.

FIG. 8 is an explanatory diagram of a packaging bag in another comparative example.

[Explanation of symbols]

1 Microwave packaging bag 2 Lower member 3 Upper member 4 wings 5 Main seal part 5G guide seal part 5S tear seal 6 point seal part 6N Unsealed part 6P pattern seal part 7 notches 8 notches 10 Laminate forming a packaging bag 11 Base material layer 12 Middle class 13 Sealant layer

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3E064 AA05 BA27 BA28 BA29 BA30                       BA36 BA55 BB03 BC01 BC08                       BC18 EA30 HD02 HD10 HE04                       HN05

Claims (6)

[Claims] 1. A bag for heating with a microwave oven, comprising a composite film having at least one surface composed of a sealant layer, a lower member having a sealant surface as an upper surface, and a sealant surface facing each other. Forming a wing portion that seals the end portion and the front end side portion, and superimposes an upper member having a sealant surface as a lower surface, and seals a peripheral portion of the wing portion to form a main seal portion, which is a region inside the wing portion. A point seal part is provided in the bag, and at least one easy vaporization means is provided in the point seal part, and when the point seal part draws a circle around the center part of the bag, The electron is provided at a position such that the radius of the circle that touches the bottom end of the point seal part from the center of the Nji packaging bag. 2. The packaging bag for a microwave oven according to claim 1, wherein an unsealed portion is formed inside the point seal portion. 3. The packaging bag for a microwave oven according to claim 1, wherein a pattern seal portion is formed inside the point seal portion. 4. The packaging bag for a microwave oven according to claim 1, wherein the easily vaporizable means is a cutting blade or a notch. 5. The distance between at least one cutting edge and the lower end of the notch provided at the point seal portion and the lower end portion of the point seal portion is 3 to 10 mm. The packaging bag for a microwave oven according to any one of 4 above. 6. The ratio of the length from the end of the packaging bag to the wing and the length from the wing to the other end is ⅔ or less, according to any one of claims 1 to 5. The packaging bag for the microwave oven described.