JP2001301844A - Pouch adaptable to microwave oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pouch adaptable to a microwave oven and not generating a rupture even in the case of heating a seasoning to be attached to a food heated in the microwave oven and seal packaged together with a food in a lunch box or the like. SOLUTION: The pouch for storing the seasoning is attached to the food to be heated by the microwave oven, and a packaging material 1 with a resin layer 4 provided with the given strength effective under the temperature environment at the room temperature or lower but to be lowered under the high temperature environment and formed at least on one area provided between a heat- resistant base layer 2 and a sealant layer 6 is used, and the sealant layer 6 is so disposed as to be positioned inside the pouch to seal a given section to be sealed, and at least on a part of the section to be sealed, the resin layer 4 is so formed as to cross from the inside toward the outside of the pouch to solve the problem of generation of the rupture. As the seasoning, a Kezuribushi (shavings of dried bointo), a Furikake (fish and vegetable flour) or the like attached to lunch boxes, daily dishes in a case or the like sold in convenience stores and supermarkets is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave-compatible pouch for seasonings to be added to foods to be heated in a microwave oven, and more particularly, to a sealed and packaged seasoning in a microwave oven together with food such as a lunch box. The present invention relates to a microwave-compatible pouch that does not burst even if it does.

[0002]

2. Description of the Related Art Bento, prepared foods, frozen foods, chilled foods and the like (hereinafter referred to as "bentos, etc.") sold at convenience stores and supermarkets, etc. include bonito, sprinkle, pepper, and blue glue sealed in small bags. ,
Powdered cheese or mayonnaise or the like (hereinafter, referred to as "seasoning") is often added together.

[0003] The above-mentioned bento and the like are cooked or heated by heating in a microwave oven. At this time, when the seasoned product sealed and packaged in the small bag is heated in a microwave oven together with a lunch box, the small bag becomes large due to the expansion of the air in the small bag and the increase in the internal pressure due to the vaporization of the moisture in the seasoned product. Failures such as bursting of sound or spattering of seasonings occur. for that reason,
Conventionally, a small bag is taken out in advance and only a lunch box or the like is heated in a microwave oven, or a hole is formed in the small bag before heating to prevent the internal pressure from rising.

[0004]

However, it is extremely inconvenient to take out the sachet in advance or to make a hole in the sachet, and it has not endured the inconvenience.

In addition, a non-woven fabric is used as a packaging material for preventing rupture (Japanese Patent Application Laid-Open No. 9-249267), and an unsealed portion for suppressing an increase in internal pressure is provided (Japanese Patent Application Laid-Open No. 11-178713). Japanese Patent Application Laid-Open No. 5-49462 discloses a method of distributing and selling a packaged seasoned product because the small bag is not sealed. There was also a major problem that quality was deteriorated by oxygen and water vapor in the process.

The present invention has been made to solve the above-mentioned problem. Even when a hermetically sealed condiment attached to food to be heated in a microwave oven is heated in a microwave oven together with food such as a lunch box, An object of the present invention is to provide a microwave-compatible pouch that does not burst.

[0007]

The pouch for a microwave oven according to the present invention is a pouch for a seasoning to be attached to food heated by a microwave oven, wherein a pouch is provided between a heat-resistant base material layer and a sealant layer at room temperature. The following temperature environment has a predetermined strength, but in a high temperature environment, the predetermined strength is reduced by using a packaging material provided with a resin layer in at least one region, and the sealant layer is arranged inside the pouch. A predetermined portion to be sealed is sealed, and at least a part of the portion to be sealed is formed so as to cross the resin layer from the inside to the outside of the pouch.

According to the present invention, a small bag for seasonings is produced using a packaging material provided with a resin layer having a predetermined strength in a temperature environment of room temperature or lower, but having a reduced strength in a high temperature environment. Therefore, when heated in a microwave oven together with a lunch box, the resin layer and a part of the sealant layer are partially broken and opened when the strength of the resin layer is reduced. As a result, the internal pressure can be reduced without scattering the seasoning in the pouch. In addition, since the sealing strength is sufficient at room temperature or lower, that is, in the environmental temperature range at the time of the packaging process of the seasoning or at the time of distribution and sale after packaging, the sealed state can be maintained, and the quality does not deteriorate. . Further, since the resin layer is provided so as to cross a part of the seal portion, the seal portion of the small bag is partially broken and opened when heated in a microwave oven, so that the small bag does not burst.

In the pouch for a microwave oven according to the present invention,
The resin layer is made of a resin composition containing an ethylene-vinyl acetate copolymer resin having a softening temperature of 60 to 90 ° C., a polyamide-nitrified cotton-based resin, or a polyamide-nitrified cotton-polyethylene wax-based resin. Is preferred. By using such a resin composition, partial heating of the resin layer and the sealant layer is likely to occur when heated in a microwave oven.

In the pouch for a microwave oven according to the present invention,
The sealant layer, 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- Any one or more of an acrylic 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, and an ionomer film Consisting of a single-layer sealant layer or a multi-layer sealant layer.

In the pouch for a microwave oven according to the present invention, the heat-resistant base material layer may be made of a stretched polyethylene terephthalate film, a silica-deposited polyethylene terephthalate film, an alumina-deposited polyethylene terephthalate film, a stretched nylon film, a silica-deposited stretched nylon film, Any one or more of alumina deposited stretched nylon film, stretched polypropylene film, polyvinyl alcohol coated stretched polypropylene film, nylon 6 / meta-xylene diamine nylon 6 co-pressed co-stretched film, polypropylene / ethylene-vinyl alcohol copolymer co-pressed co-stretched film Can be formed by

[0012] In the above-mentioned pouch for a microwave oven, the transverse portion of the resin layer has an easy-opening processed portion. According to the present invention, the resin layer in the easily opened portion is selectively broken and opened. As a result, the bag is easily opened before the internal pressure of the bag becomes high, so that the bag can be prevented from expanding or bursting.

At this time, the easy-opening portion is a protruding seal portion formed in a shape protruding inward from the pouch, and the protruding seal portion reduces the length of a portion traversed by the resin layer. It is preferable that at least a hole or a notch is provided in the packaging material on the side having the resin layer. According to the present invention, since the stress of the internal pressure that has increased based on the microwave heating is concentrated on the protruding seal portion,
The resin layer and the sealant layer of the protruding seal portion are selectively broken, and the small bag can be easily opened. In addition, since the length of the resin layer and the sealant layer that are selectively broken at the protruding seal portion is shortened by the holes and the notches, the small bag can be easily and quickly opened based on such breakage.

It is preferable that the easily opened portion is a portion where a cut, a half cut, a perforation or an emboss is formed in a thickness direction of the heat resistant base material layer. According to the present invention, the resin layer and the sealant layer of the seal portion are easily and selectively destroyed at the cut, half-cut, perforated or embossed portion, so that the internal pressure of the small bag is reduced by heating the microwave oven. Before being raised, such processed parts are destroyed and the pouch is opened.

In the small pouch for a microwave oven according to the present invention, the seasoning is preferably a non-liquid substance. Since the pouch of the present invention is maintained in a sealed state, it can maintain the quality of the non-liquid seasoning and does not burst and scatter even when heated together with food or the like. At this time, when the seasoning is a non-liquid bonito, the quality of the bonito can be maintained, and the sachet does not burst even if heated in a microwave oven together with a lunch box, so that the bonito does not scatter. .

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below.

FIG. 1 is a cross-sectional view showing one example of a packaging material 1 used for a microwave-compatible pouch according to the present invention. As shown in FIG. 1, the packaging material 1 has a heat-resistant base material layer 2, a printing layer 3, a resin layer 4, an adhesive layer 5, and a sealant layer 6, which are laminated in this order. Note that the printing layer 3 and the adhesive layer 5 are not essential layers, but are layers provided as needed as needed, as described later. Therefore, the packaging material used in the present invention should have at least the resin layer 4 between the heat-resistant resin layer 2 and the sealant layer 6.
It is a laminated body provided with.

The packaging material 1 of the present invention has a resin layer having a predetermined strength between the heat-resistant base material layer 2 and the sealant layer 6 at a temperature lower than room temperature, but having a lower predetermined strength at a high temperature environment. 4 in at least one region. Then, the sealant layer 6 is arranged so as to be inside the pouch,
It is used to manufacture a microwave-compatible pouch by sealing a predetermined sealed portion. Further, as will be described later, this packaging material 1 is provided with a projecting seal having a shape protruding inward from the pouch at a portion where the resin layer 4 crosses the sealed portion when sealing a predetermined sealed portion. Part (first easy-opening processing part)
(B) After sealing a predetermined sealing portion, the resin layer 4 cuts, half-cuts, perforates the heat-resistant resin layer 2 at a portion crossing the portion to be sealed. Alternatively, it is also used for producing a microwave-compatible pouch having a portion (a second easy-opening portion) in which an emboss is formed in the thickness direction.

The heat-resistant base material layer 2 is an essential layer of the packaging material 1, and is provided so as to be disposed outside when the pouch of the present invention is produced using this packaging material. The heat-resistant base material layer 2 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. For example, 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,
Any one of a stretched polypropylene film, a polyvinyl alcohol coated stretched polypropylene film, a nylon 6 / meta-xylene diamine nylon 6 co-pressed co-stretched film, a polypropylene / ethylene-vinyl alcohol copolymer co-pressed co-stretched film, etc. is used. be able to. These heat resistant resin layers 2 usually have a melting point of 1
The temperature is 50 ° C. or higher, and the thickness is 10 to 50 μm, preferably 10 to 20 μm.

The printing layer 3 is provided for the purpose of displaying contents or imparting aesthetics by a conventionally known printing method or the like, and is not an essential layer but is provided as needed as appropriate. Usually, as shown in FIG. 1, the printed layer 3 is formed on the upper surface side of the heat-resistant base material layer 2, that is, inside the heat-resistant base material layer 2 (seasoned product side) when the pouch is manufactured. It is formed on the lower surface side of the heat-resistant resin layer 2, that is, on the outer side of the heat-resistant base material layer 2 (the side opposite to the seasoning) when the pouch is produced.

The resin layer 4 is provided between the heat-resistant resin layer 2 and the sealant layer 6 as an essential layer. This resin layer 4
Has a predetermined strength in a temperature environment equal to or lower than room temperature, but has a property of decreasing its strength in a high temperature environment.

The temperature at or below room temperature at which the predetermined strength is maintained is usually defined as the environmental temperature at which the seasoning is packaged using the packaging material 1 or when the sachet after sealing and packaging the seasoning is frozen with the food. And the environmental temperature at the time of distribution and sale together with a lunch box or the like or a small bag alone. Therefore, the resin layer 4 maintains a predetermined strength in such a temperature environment. On the other hand, the high-temperature environment in which the above-mentioned predetermined strength is reduced is a temperature applied when a small bag sealed and packaged with seasonings is heated or cooked in a microwave oven together with a lunch box or the like. The strength of the resin layer 4 will be reduced.

In the present invention, the resin layer 4 having such a property is placed at a predetermined position of the packaging material 1, that is, at least a part (one region) of a predetermined portion to be sealed (one region) to be sealed when the pouch is produced. Is provided so as to traverse from inside to outside. The resin layer 4 provided at such a position
The strength is reduced by heating in a microwave oven to a high temperature.

As shown in an enlarged cross-sectional view of the sealing portion 22 of the small bag 21 in FIG. 2, the formed resin layer 4 is heated by a microwave oven or the like to expand the air in the small bag 21 or the moisture contained in the seasoning. When the internal pressure rises due to vaporization of the resin layer 4, the resin layer 4 having reduced strength is broken starting from an arbitrary position 23 of the sealant layer 6 near the seal portion 22 (reference numeral 24).
Indicates a virtual line to be destroyed. ). As a result, the sealing portion 2
2 between the sealant layer 6 and the heat-resistant base material layer 2.
Since relatively small air escape occurs due to the destruction of the resin layer 4 from the inside to the outside of 1, water vapor or the like in the small bag 21 escapes, and the internal pressure can be reduced.
In the present invention, since the destruction occurs partially, air bleeding of a relatively small size occurs, the internal pressure of the pouch 21 does not drop at a stretch, and spatter does not occur.

As the resin layer 4 having such properties,
Materials having a melting point of 60-90 ° C, for example, ethylene-
A resin composition containing a vinyl acetate-based copolymer resin, a polyamide-nitrified cotton-based resin, or a polyad-nitrified cotton-polyethylene wax-based resin can be given. By using a resin layer having a melting point of 60 to 90 ° C., partial heating of the resin layer 4 and the sealant layer 6 is likely to occur when heated in a microwave oven.

The resin layer 4 can be formed by a conventionally known resin coating method and has a thickness of 1 to 5 μm.
It is preferred that If the thickness of the resin layer 4 is less than 1 μm, there is a disadvantage that the resin layer 4 and the sealant layer 6 hardly break when heated in a microwave oven, and if the thickness of the resin layer 4 exceeds 5 μm, Depending on the pattern of the resin layer 4, when the obtained film-like packaging material is wound into a roll, there is an inconvenience that a bulge occurs in a part and the packaging material in that part expands.

When the packaging material 1 is sealed by overlapping a sealant layer 6 to be described later so as to face each other, the sealing strength in a region where the resin layer 4 is provided is 7 N / 15 mm or more in a temperature region below room temperature. In a high temperature range of not less than ° C., it is preferably 3 N / 15 mm or less. Since the seal strength is 7 N / 15 mm or more in a temperature range of room temperature or lower, the seal portion does not peel off and be opened depending on when it is stored with a lunch box or the like or when it is distributed or sold. On the other hand, since the seal strength is 3 N / 15 mm or less in a high temperature range of 80 ° C. or more, when heated in a microwave oven, the resin layer 4 and the sealant layer 6 are partially broken. descend. A small bag made of a packaging material having such characteristics can adjust the sealing strength within that range.

The sealant layer 6 is provided on the resin layer 4 as an essential layer, and becomes the innermost layer that comes into contact with the seasoning when a small bag is produced. The sealant layer 6 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. For example, 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 acid copolymer Polymer film, ethylene-methacrylic acid copolymer film,
Any one or more of an ethylene-methyl acrylate copolymer film, an ethylene-ethyl acrylate copolymer film, an ethylene-methyl methacrylate copolymer film, and an ionomer film are used, and a single-layer or multi-layer sealant layer is used. It can be. The thickness of these sealant layers 6 is usually 2
It is 0 to 60 μm, preferably 30 to 40 μm. In the present invention, when the sachet is made, the sealant layer 6
Since they form the sealing surface at the sealed part of the pouch,
A sealed state can be maintained at the time of freezing, storage, distribution / sales, etc., and the quality of the packaged seasonings does not deteriorate.

When the strength of the resin layer 4 is reduced in a high temperature range, the sealant layer 6
The internal pressure that has risen inside must be maintained by the strength of the sealant layer 6 itself. Therefore, the sealant layer 6 near the boundary of the seal portion 22 inside the pouch 21 is likely to crack due to a decrease in the strength of the resin layer 4 provided immediately next to the sealant layer 6, and eventually cannot withstand the internal pressure. The resin layer 4 is destroyed together with the resin layer 4 from an arbitrary point 23 as a starting point, and air escape occurs (see FIG. 2).

Although not shown, for example, one or both of an oxygen barrier layer and a shock absorbing resin layer may be provided as an intermediate layer. Also, several of these layers can be provided. For example, as the oxygen barrier layer, a vinylidene chloride film, an ethylene-vinyl alcohol copolymer film, or an inorganic vapor-deposited film can be used. As the shock absorbing resin layer, a nylon film is preferably used. As the nylon film, any one of uniaxial stretching, biaxial stretching and non-stretching can be suitably used. Although the thickness of the shock absorbing resin layer is not particularly limited, it is generally in the range of 5 to 40 μm, preferably 10 to 30 μm. However, even when such an intermediate layer is provided, providing the resin layer 4 on the sealant layer 6 which is the innermost layer or on the sealant layer 6 via the adhesive layer 5 easily causes air to escape. Preferred from a viewpoint.

Known additives such as a lubricant, an antioxidant, an antistatic agent and a coloring agent may be added to the resin forming each layer of the packaging material as long as the object of the present invention is not impaired. Can be. Each layer may be attached using an adhesive such as a urethane-based adhesive. It should be noted that other adhesives can be used as long as they are publicly known and do not impair hygiene.

The packaging material 1 described above is overlapped so that the sealant layer 6 faces each other, and a desired sealed portion is heat-sealed, whereby the pouch for a microwave oven according to the present invention can be manufactured. Further, the present invention can be applied to a pillow package, and air can escape from the back seal portion. As the method of heat sealing, a conventionally known method can be used, for example, a heating bar, a heating knife,
External heating method, such as heating wire, impulse seal,
Alternatively, an internal heating method such as an ultrasonic seal or a dielectric heat seal can be used.

FIG. 3 shows a resin layer forming region 32 in which a resin layer 4 is pattern-coated on a predetermined region of a raw material of a packaging material 31.
FIG. 4 is a plan view showing an example of a microwave pouch 41 of the present invention manufactured using the packaging material 31 for a microwave oven shown in FIG. The pouch 41 is manufactured by folding the raw material of the packaging material 31 as shown in FIG. 4 or stacking two sheets (not shown), and heat-sealing the outer periphery thereof. The above-described resin layer 4 can be formed on the entire surface of the raw material of the packaging material 31, but can also be formed as a pattern in one region 32 thereof as shown in FIG.
When the resin layer 4 is pattern-formed, the formation position is at least one region 32 of the sealed portion to be sealed.
Must be formed so as to traverse from the inside to the outside of the pouch. As a result, the resin layer 4 and the sealant layer 6 are partially destroyed in the resin layer forming region 32 of the seal portion by heating in the microwave oven, and air escape occurs, and the seasonings are not scattered. The pressure in the pouch can be reduced.

Next, the easily opened portion and the small bag having the easily opened portion will be described.

The easy-opening portion comprises (a) a first sealing portion having a shape protruding inwardly into the pouch at a portion where the resin layer 4 crosses the sealing portion when sealing a predetermined sealing portion. After sealing the easy-opening portion or (b) a predetermined sealing portion, the heat-resistant resin layer 2 where the resin layer 4 crosses the portion to be sealed is cut, half-cut, perforated or embossed. It refers to a second easy-opening portion formed in the thickness direction. This easy-opening portion serves as a starting point for selectively opening the small bag when heated in a microwave oven. Here, the easy-opening processed portion means a portion which is processed so that opening is easily caused selectively.

FIG. 5 is a plan view showing the shape of the first easy-opening portion provided in the microwave-compatible pouch of the present invention. As shown in FIGS. 5 (a) to 5 (c), the first easy-opening processing portion includes a protruding seal portion 5 formed toward the inside of the pouch.
1, 52, and 53, for example, in a triangular shape (FIG. 5).
(A)), arc shapes such as semicircles (FIG. 5 (b)), trapezoidal shapes (FIG. 5 (c)), and square shapes.
Such projecting seal portions 51, 52, 53 can be easily formed by improving or selecting the shape of the heating jig at the time of heat sealing. Projection seal part 5
When the pouch is heated in a microwave oven, the stress of the increased internal pressure will be concentrated on 1, 52, and 53, and as a result, the resin layer 4 and the sealant layer 6 of the protruding seal portions 51, 52, and 53 will be concentrated. It is selectively broken and the pouch is opened. In addition, by appropriately selecting the shape of the protruding seal portion,
The degree of concentration of the stress on the protruding seal portion can be appropriately set. For example, the protruding seal portion having the corner portion 55 as shown in FIGS. 5A and 5C has a higher internal pressure at the corner portion 55 than the arc-shaped protruding seal portion as shown in FIG. The stress based on the concentration is concentrated and the selective destruction is easily caused.

Projecting seal portion 5 which is a first easy-opening portion
The holes 1, 52, and 53 are preferably provided with holes 61 or cutouts 62 as shown in FIG. Such a hole 61 or a notch 62 is provided to shorten the length L of a portion traversed by the resin layer 4.
By providing the hole 61 or the notch 62, the length L of the resin layer 4 and the sealant layer 6 is shortened when the protruding seal portion of the pouch heated by the microwave oven is selectively broken. As shown in FIGS. 7B and 7D, the small bag can be easily and quickly opened based on the destruction of the resin layer 4 and the sealant layer 6. As a result, it is more effective to prevent the popping sound at the time of opening and to prevent the pouch from bulging. Hole 61
Alternatively, the shape of the notch 62 is not particularly limited.
As shown in the figure, it is preferable that the protrusion seal portions 51, 52, 53 are formed in a shape along the shape thereof, and that the length L that can be broken by the protrusion seal portions is substantially the same in each portion. Is preferred.

As shown in FIG. 7, the holes 61 or the notches 62 need to be provided at least in the packaging material on the side where the resin layer 4 is provided, but the resin layer 4 is provided. It may be formed together with the packaging material on the other side. In the case of forming together with the packaging material on the side where the resin layer 4 is not provided, after forming a small bag having a protruding seal portion by heat sealing, the above-mentioned hole 61 is formed by punching, punching, cutting or punching. Alternatively, the notch 62 can be formed, which is convenient in manufacturing.

FIG. 8 is a plan view showing the shape of the second easy-opening portion provided in the microwave-compatible pouch of the present invention. FIG. 9 is a view showing the heat resistance of the portion where the resin layer crosses the portion to be sealed. It is sectional drawing which shows the aspect in which the cut was formed in the resin layer, and the aspect after opening based on selective destruction.

FIGS. 8 (a) and 8 (b)
As shown in the figure, the portion 8 where the resin layer 4
This is a portion in which a cut, a half cut, a perforation, an emboss, or the like (hereinafter, referred to as a “cut or the like 82”) is formed in the thickness direction of the first heat-resistant resin layer 2. Such a second easy-opening portion is usually formed by processing after sealing a predetermined seal portion.
If the cuts or the like 82 are formed in the thickness direction of the heat-resistant resin layer 2, the direction in which the cuts or the like 82 extend is the X direction along the sealing direction or the Y direction orthogonal to the sealing direction. May be used, and there is no particular limitation. Normally,
The cut 82 extends in the X direction along the sealing direction. Further, as shown in FIG. 9B, a plurality of cuts 82 can be formed. As shown in FIGS. 8A and 8B, the cuts 82 can be provided at any portion as long as the portions are heat-sealed portions 81 where the resin layer is formed.

The type of the notches 82, the direction in which the notches 82 extend, the position of the notches 82, the number of the notches 82, and the like are appropriately set to form the second easy-opening portion, so that the microwave oven can be used. The ease with which the pouch can be opened when heated can be adjusted. For cutting, a conventionally known method can be adopted, for example, cutting is formed by a cutter or punch, half-cut is formed by a laser or a cutter, perforation is formed by a cutter, and emboss is formed by an emboss roll. be able to. By the cuts or the like 82, the resin layer 4 and the sealant layer 6 of the seal portion, which is the second easy-opening portion, are easily and selectively destroyed.

It should be noted that the first easy-opening portion and the second easy-opening portion described above can be formed together. That is, while forming the 1st easy-opening processing part which consists of a protruding seal part, a notch etc. are formed in the part and a 2nd easy-opening processing part can also be formed. Such a composite easy-opening portion is employed when appropriately adjusting the ease of opening a small bag when heated in a microwave oven.

In the present invention, the seasoning is not particularly limited as long as it is accompanied by a lunch box, prepared food, frozen food, chilled food, etc. sold at a convenience store or a supermarket. Usually, it is preferably a powdery or semi-fluid, which is a non-liquid material. For example, powdery materials include bonito (sharpened knot), sprinkle, pepper, blue seaweed, powdered cheese, and the like, and semi-fluid materials include mayonnaise and the like. Of these, the bonito (shaved node) and sprinkle are particularly preferably applied. The pouch for a microwave oven of the present invention is such that such seasonings are hermetically packaged and attached together with a lunch box or the like.
It has a size of about cm × 15 cm or less.

[0044]

The present invention will be further described with reference to the following examples.

Example 1 A barrier heat-resistant base material layer 2 was a 12 μm-thick alumina-deposited polyethylene terephthalate film, on which a resin layer 4 was formed of ethylene-ethylene.
Vinyl acetate copolymer resin (melting point: 66.8 ° C, WT-P
C agent: manufactured by The Inktech Co., Ltd.) was pattern-coated in a pattern as shown in FIG. 3 so as to have a thickness of 3 μm. Further, a sealant layer 6 having a thickness of 30
Using a μm ethylene-vinyl acetate copolymer resin film, they were bonded by an extrusion method to prepare a packaging material for a small bag compatible with a microwave oven. The sealing strength of the resin layer coated portion of the obtained packaging material was 27.2 N / 15 mm at 25 ° C. and 1.3 N / 15 mm at 90 ° C.

Using this packaging material, a four-sided pouch having a size of 70 mm × 90 mm filled with 1 g of knots was prepared, and a pouch for a microwave oven of Example 1 was obtained.

When the pouch was heated in a microwave oven of 1100 W, the portion covered with the pattern was opened without sound after about 15 seconds.

Example 2 A barrier-resistant heat-resistant base material layer 2 was a 12 μm-thick alumina-deposited polyethylene terephthalate film, and a resin layer 4 containing a polyamide / nitrified cotton-based resin (melting point: 83.degree. 8 ° C, E
OP Varnish: manufactured by The Inktech Co., Ltd.) was pattern-coated in a pattern as shown in FIG. 3 so as to have a thickness of 3 μm. Further, a 30 μm thick linear low-density polyethylene film was used as the sealant layer 6 and bonded together by a dry lamination method to produce a packaging material for a small bag compatible with a microwave oven. The sealing strength of the resin layer coated portion of the obtained packaging material was 19.2 N / 1 at 23 ° C.
5 mm and 2.5 N / 15 mm at 90 ° C.

Using this packaging material, a four-sided pouch having a size of 70 mm × 90 mm filled with 1 g of knots was prepared, and a pouch for a microwave oven of Example 2 was obtained.

When the pouch was heated in a microwave oven of 1100 W, after about 15 seconds, the above-mentioned pattern-coated portion was opened without sound.

(Measurement of Seal Strength) The seal strength of the packaging materials obtained in Examples 1 and 2 was measured as follows. First, the sealant layers 6 are arranged so as to face each other,
A predetermined sealing width (for example, 10 mm) is thermocompression-bonded under normal sealing conditions (conditions: 150 ° C., 98 kPa, 1 second),
Next, two pieces of the packaging material were cut into strips having a width of 15 mm to prepare measurement samples. Then, a seal test (unit: N / 15 mm) was measured by performing a tensile test (Tensilon Universal Tensile Tester, manufactured by Orientec Co., Ltd.) so as to peel off the compression-sealed portion of the prepared measurement sample. The pulling speed at this time was 300 mm / min. Further, the tensile strength at each temperature was measured by attaching a measurement sample in a thermostatic container and performing a tensile test.

[0052]

As described above, according to the pouch for a microwave oven of the present invention, when heated in a microwave oven together with a lunch box, the resin layer and the sealant layer are triggered by a decrease in the strength of the resin layer. Is partially broken and opened, so that the internal pressure can be reduced without scattering the seasoning in the pouch. In addition, since the sealing strength is sufficient at room temperature or lower, that is, in the environmental temperature range at the time of the packaging process of the seasoning or at the time of distribution and sale after packaging, the sealed state can be maintained, and the quality does not deteriorate. .
Further, since the resin layer is provided so as to cross a part of the seal portion, the seal portion of the small bag is partially broken and opened when heated in a microwave oven, so that the small bag does not burst.

Further, in the small bag for microwave oven according to the present invention, by providing the easily opened portion at the crossing portion of the resin layer, the small bag can be easily and selectively opened before the internal pressure of the small bag becomes high. Inflation and rupture of the pouch can be prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a packaging material for a small pouch compatible with a microwave oven.

FIG. 2 is an enlarged sectional view showing an example of a sealed portion of a small bag made of a packaging material for a microwave-compatible small bag.

FIG. 3 is a plan view showing a state where a resin layer is pattern-coated on a predetermined region of a raw material of a packaging material for a microwave-compatible small bag.

FIG. 4 is a plan view showing an example of a microwave-compatible pouch produced using the packaging material shown in FIG.

FIG. 5 is a plan view showing an example of the shape of a first easy-open processing portion provided in a microwave-compatible pouch.

6 is a plan view showing an example of the shape of a hole and a notch provided in the protruding seal portion of FIG.

FIG. 7 is a cross-sectional view showing an example of a mode of forming the holes shown in FIG. 6 (b).

FIG. 8 is a plan view showing a shape of a second easy-opening portion provided in the small pouch corresponding to the microwave oven.

FIG. 9 is a cross-sectional view showing a mode in which a cut is formed in a portion of the heat-resistant resin layer where the resin layer traverses the sealed portion, and a mode after opening based on selective destruction.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 31 Packaging material for microwave-compatible pouches 2 Heat-resistant resin layer 3 Printing layer 4 Resin layer 5 Adhesive layer 6 Sealant layer 21, 41 Pouch 22 Sealing part 23 Arbitrary place used as a starting point of breakage 24 Virtual line to break 32 , 81 Resin layer forming area 51, 52, 53 Protruding seal portion 55 Corner portion 61 Hole 62 Notch 82 Notch etc. L Length that can be broken by protruding seal portion X Direction along sealing direction Y Direction perpendicular to sealing direction

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hirotaka Tsuchiya 1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo Dai Nippon Printing Co., Ltd. Address The Inktec Co., Ltd. F-term (reference) 4F100 AA19D AA20D AJ06C AK01C AK03C AK05B AK06B AK07A AK07B AK21D AK42A AK46C AK47D AK48A AK63B AK68B AK68C AK69A BAB BA17 BA17 BA13 BA17 BA17 BA17 BA13 BA17 JJ03A JJ03C JK01C JL00 JL06 JL12B JL14C

Claims (9)

[Claims] 1. A pouch for a microwave oven for seasonings to be added to food heated by a microwave oven, having a predetermined strength between a heat-resistant base material layer and a sealant layer in a temperature environment of room temperature or lower. However, in a high temperature environment, using a packaging material provided with at least one area of the resin layer having the predetermined strength lowered, and sealing the predetermined sealed portion by disposing the sealant layer inside the small bag. In addition, at least a part of the sealed portion, the resin layer is formed so as to cross from the inside to the outside of the small bag, and is compatible with a microwave oven. 2. A resin in which the resin layer contains an ethylene-vinyl acetate copolymer resin, a polyamide-nitrified cotton resin, or a polyamide-nitrified cotton-polyethylene wax resin having a softening temperature of 60 to 90 ° C. The pouch for a microwave oven according to claim 1, comprising a composition. 3. The sealant layer is formed of a low-density polyethylene film, an ultra-low-density polyethylene film, a linear low-density polyethylene film, a medium-density polyethylene film, a high-density polyethylene film, an unstretched polypropylene film, and ethylene-vinyl acetate copolymer. Coalescing film,
Either an ethylene-acrylic 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 or an ionomer film 3. The pouch for a microwave oven according to claim 1, wherein the pouch is a single-layer or multi-layer sealant layer composed of at least one kind. 4. The heat-resistant base material layer is a stretched polyethylene terephthalate film, a silica-deposited polyethylene terephthalate film, an alumina-deposited polyethylene terephthalate film, a stretched nylon film, a silica-deposited stretched nylon film, an alumina-deposited stretched nylon film, a stretched polypropylene film, Polyvinyl alcohol coated stretched polypropylene film, nylon 6 /
Metaxylene diamine nylon 6 co-pressed co-stretched film,
The pouch for a microwave oven according to any one of claims 1 to 3, characterized by comprising at least one of a polypropylene / ethylene-vinyl alcohol copolymer co-extrusion co-stretched film. 5. The pouch for a microwave oven according to claim 1, wherein a transverse portion of the resin layer has an easily opened portion. 6. The easy-opening portion is a protruding seal portion formed in a shape protruding inward from the pouch, and the protruding seal portion reduces a length of a portion traversed by the resin layer. 6. The microwave-compatible pouch according to claim 5, wherein at least a hole or a notch is provided in the packaging material on the side having the resin layer. 7. The easy-opening portion according to claim 5, wherein a cut, a half cut, a perforation or an emboss is formed in a thickness direction of the heat-resistant base material layer. Microwave-compatible pouch. 8. The pouch for a microwave oven according to claim 1, wherein the seasoning is a non-liquid substance. 9. The pouch for a microwave oven according to claim 8, wherein the non-liquid material is bonito.