JPH082284B2 - Bags for packaging water-retaining items such as food and packed food - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag used for packaging and cooking water-retaining objects such as foods represented by grilled rice balls, buns, sushi and hot dogs, and The present invention relates to a food packaged with these contained objects.

[0002]

2. Description of the Related Art Conventionally, when a food is cooked in a microwave oven or the like, the food is directly sealed with an airtight film, or the food placed on a plate is wrapped, or a main body molded with a synthetic resin is used. Food is contained in a so-called steamer having a lid and a ventilation hole formed at an appropriate position of the main body or the lid, and cooked by heating. Further, there are packaging bags in which a non-breathable material is made into a bag shape according to the shape of food and the outer periphery is hermetically sealed, and food packed with this.

However, when an airtight film or a synthetic resin container is used, water vapor released from the food during storage or cooking adheres to the film or the inner surface of the container as a water drop, and the water drop directly heats the food. There was a problem that the food surface was sticky and sticky to the food surface. Also, in the case of food packed in a non-breathable material bag, it cannot be cooked as it is, and the food is taken out by breaking the bag and wrapped in the film or transferred to the synthetic resin container and heated. I had to.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention provides a packaging bag in which food or the like can be cooked in a microwave oven as it is and the surface of the food is not sticky due to water vapor released from the food during heating. Is intended to be provided.

[0005]

In order to achieve the above-mentioned object, the packaging bag according to the present invention is made of a breathable material, the inside of which serves as a housing for food and other water-retaining objects. It consists of an inner bag and an outer bag made of a non-breathable material that is externally attached to the inner bag. A buffer chamber is provided between the bag and the bag, and a ventilation small hole communicating with the outside of the bag is provided.

The packaging bag may be provided at its outer peripheral portion with an opening for accommodating food or the like in the accommodating portion, which is adhered after accommodating the food or the like in the accommodating portion. Furthermore,
A hygroscopic agent may be provided in the buffer chamber of the packaging bag.

The packaged food according to the present invention is packaged in the above packaging bag, and is particularly suitable for frozen foods.

[0008]

In the packaging bag for water-retaining food-stuffs such as foods of the present invention, the water-retaining food-stuffs such as foods are stored in the storage portion inside the inner bag made of a breathable material, and a microwave oven, etc. When heated in, steam is released from the surface of food etc. by heating. This water vapor is accumulated in the buffer chamber between the outer bag and the inner bag, and when the pressure in the buffer chamber exceeds a certain pressure, it is discharged to the outside of the bag through the small holes for ventilation and the inner bag is also formed. The water droplets attached to the outer surface or the inner surface of the outer bag remain in the buffer chamber, and new water vapor is accumulated again in the buffer chamber. This operation is repeated, heating is stopped when the food or the like reaches a suitable temperature, and then the bag is broken to take out the food or the like cooked at the suitable temperature.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view showing an embodiment of the packaging bag of the present invention, and FIG. 2 is a partially enlarged perspective view in which a part thereof is broken. Reference numeral 1 denotes an inner bag made of a breathable material, the inside of which serves as a storage portion 2 for food and other water-retaining objects. As this breathable material, a paper material such as a non-woven fabric made of a thermoplastic synthetic resin having a breathability or Japanese paper can be considered.
It is even better if these materials are translucent or opaque. In order to form these breathable materials into a bag shape, a synthetic resin material that can be heat-welded to the material is used, or two breathable materials having the same shape as the thin film are formed on the inner surface of the outer peripheral portion, for example, CPP. If a thermoplastic adhesive such as a sealant is impregnated, adhered, or a film capable of being heat-welded is attached, and the entire outer peripheral portion provided with this adhesive or the opening 55 described later is left,
Inner bag 1 made of breathable material with the inside containing section 2
Can be formed.

Reference numeral 3 denotes an outer bag made of a non-air-permeable material which is provided on the inner bag 1 and has a buffer chamber 4 provided between the outer bag 1 and the inner bag 1. As this non-breathable material, it is preferable to use a film obtained by laminating a polyethylene film and a polyester film in consideration of heat resistance and the like, but it is not particularly limited, and a conventional non-breathable film, for example, heat Any plastic synthetic resin film can be used. It is more preferable that these films are transparent materials. By stacking these non-breathable materials on the inner bag 1 and adhering the outer peripheral portion excluding the ventilation small holes, which will be described later, to the outer peripheral portion of the inner bag 2 by the thermoplastic adhesive or heat welding,
A buffer chamber 4 is formed between the outer surface of the inner bag 1 and the inner surface of the outer bag 3 in a non-adhesive state.

If a material such as CPP sealant that can penetrate into the material of the inner bag 1 is used as the thermoplastic adhesive, the thermoplastic adhesive will penetrate into the material of the inner bag 1 at the time of heat welding. Therefore, even if an adhesive is not provided on the inner surface of the inner bag 1, the thermoplastic adhesive or the like provided on the inner surface of the outer bag 4 can be heat-welded to allow the adhesive to pass through the inner bag 1 The inner bag 1 and the outer bag 3 can be formed in a short time by bonding them together. Incidentally, an opening 55 for accommodating a water-retaining object such as food is formed in the accommodating portion 2 of the inner bag 1 by leaving a proper place when the outer peripheral portions of the inner bag 1 and the outer bag 3 are bonded. After the object to be accommodated is accommodated in the opening 55, the edge of the opening 55 is sealed with the adhesive or the like indicated by the broken line in the figure to make the outer peripheral portion of the bag substantially sealed.

Reference numeral 6 in the figure denotes a small hole for ventilation which is provided so as to communicate with the outside of the bag from the buffer chamber 4 and the inner bag 1. The ventilation small holes 6 are formed by providing a non-adhesive portion on a part of the outer peripheral portion of the outer bag 3 when the outer peripheral portion of the bag is adhered when the outer bag 3 is formed. The ventilation small hole 6 is basically good as long as it has the same effect as a ventilation hole formed in a conventional steamer or the like for releasing the internal pressure to the outside because the internal pressure of the bag is increased by heating. . However, in the present invention, if the ventilation small hole 6 which is the non-adhesive portion is set to have a diameter of 3 mm to 8 mm in a front view, the outer small bag 3 and the inner bag 1 are formed into a film shape, and the small ventilation hole is formed. No. 6 has a valve function capable of unidirectionally ventilating when the difference between the internal pressure of the buffer chamber 5 and the external pressure of the outer bag 4 becomes equal to or more than a certain level, and is closed when there is no certain pressure difference. As compared with the conventional ventilation hole that can always be ventilated, the ventilation can be performed only when necessary, so that the contained object can be heated more quickly and the ingress of outside air is prevented.

FIG. 3 is a perspective view showing an embodiment of packaged food in which food is enclosed in the accommodating portion 2 of the packaging bag constructed as described above. Although various kinds of foods are selected as the foods to be stored, it is preferable to store frozen foods and retort foods among them. As these frozen foods and retort foods, baked rice balls, musi bread, hamburgers, hot dogs, etc., water retention existing as conventional frozen foods and retort foods, that is, all foods that retain or adhere to water. It can be the object.
After these foods are accommodated in the accommodating portion 2, the accommodating port is adhered or adhered by the same heat welding means as the heat welding portion 5 is formed to cover the entire circumference of the inner bag 1 and the outer bag 3. The packaging bag is externally sealed by leaving the ventilation small holes 6 behind. In addition, since the contained object is a food, the material of the inner surface of the inner bag 1 and the outer bag 3, the thermoplastic adhesive used for heat welding, and the like are harmless to the human body. Similar to food.

The bag for packaging a water-retaining object such as food and the packaged food configured as described above can be manufactured, for example, as follows. FIG. 4 is a process explanatory view showing an example of the manufacturing method. That is, a pair of outer bag base materials 50, 50 in which the base material of the outer bag 3 is in a roll shape are arranged side by side, and the tip of the outer bag base material is sequentially fed forward, and the base material of the inner bag 1 is in a roll shape. A pair of inner bag base materials 51, 51 are arranged side by side, and these inner bag base material 5
1, 1 and 51 are polymerized, and are interposed between the outer bag base materials 50 and 50, and sequentially fed forward. In the middle of this interposition, the thermoplastic adhesive is adhered to a suitable place on the inner surface of the outer bag base material 50 or a suitable position on the outer surface of the inner bag base material 51 by a known means such as silk screen printing. Then, in front of these, an adhesion step 52 for adhering the portion that becomes the heat-welded portion 5 excluding the small holes 6 for ventilation is provided.
Weld 0 and 51. Furthermore, by providing a cutting step 54 which can cut the outer edge portion 53 of the heat-welded portion 5 or substantially the outer edge portion 53 of the heat-welded portion 5, a packaging bag having an opening 55 can be continuously manufactured. When the outer edge 53 is cut substantially outside, a slightly non-adhesive portion is formed on the outer side of the outer edge 53. The non-adhesive portion formed here is the concept of the welded portion described in the present invention. Of course, it is included. Then, the opening 5 of the packaging bag formed as described above
If the food or the like is placed from 5 and the opening 55 is further sealed through the heat welding process, the packaged food shown in FIG. 3 can be continuously manufactured.

When the packaging bag of the present invention containing a water-retaining object such as food is heated in a microwave oven or the like, as shown in the partially enlarged sectional views of the present invention shown in FIGS. Water contained in the contained object A is generated outward as steam as shown by an arrow in the figure, and the steam passes through the inner bag 1 and contacts the inner surface of the outer bag 3, Since the outer bag 3 does not allow water vapor to pass therethrough, only the outer bag 3 expands and a space is formed between the inner surface of the outer bag 3 and the outer surface of the inner bag 1 as shown in FIG. . Since water vapor is sequentially introduced into the buffer chamber 4, the outer bag 3 naturally expands further as shown in FIG. 7, and when the inside of the buffer chamber 4 becomes a constant pressure, the ventilation small hole 6 also serves as a check valve. 8, the water vapor in the buffer chamber 4 is automatically discharged to the outside as shown in FIG. 8, the pressure inside the buffer chamber 6 is reduced, and the outer bag 5 contracts in the state of FIG. 5 or 6. Such an action is repeated until the contained object A has an appropriate temperature. At this time, although water vapor is released from the vent holes 6 to the outside of the outer bag 3, it is not completely released, but the inner surface of the outer bag 3 or the outer surface of the inner bag 1, that is, the buffer chamber 4.
Water adheres to and remains as water droplets. The water droplets are prevented from penetrating into the inside by the material of the inner bag 1, so that moisture does not directly adhere to the surface of the object A to be adhered and sticky.

By providing a hygroscopic agent (not shown) in the buffer chamber 4, it is possible to completely prevent moisture from being absorbed by the hygroscopic agent and permeating into the inner bag 1. Further, if the outer bag 3 and the inner bag 1 are made of transparent materials, the cooking state of the contained object A during cooking can be visually confirmed from the outside, so that the cooked state of the contained object A can be confirmed from outside the microwave oven. You can cook while

After the contained object A is heated to an appropriate temperature in this way, it is taken out from the microwave oven or the like, and one end of the bag is cut with scissors or the like to take out the cooked contained object A. If the cut end 7 for opening the bag or other cutting means is provided in advance on the side end of the packaging bag, the object A can be easily taken out without using scissors or the like.

The inner bag 1 and the outer bag 5 are the objects 1 to be stored.
A suitable shape may be considered depending on the shape of, and, for example, as in the other embodiment shown in FIG.

[0019]

EFFECT OF THE INVENTION In the packaging bag for the water-retaining type of food or the like of the present invention and the packaged food of the present invention configured as described above, the same heat retaining property as that of the conventional film packaging, Also, during storage, the fresh air of the contained object can be maintained by preventing the invasion of outside air. Then, when the food or the like contained in the inner bag is cooked by, for example, a microwave oven, the steam generated by heating can be released to the outside, the water content is adjusted, and the water droplets attached to the buffer chamber are discharged by the inner bag. Since it does not directly adhere to the contained object, it is possible to prevent the surface of the contained object after heating from sticking due to moisture. In addition, since the inner and outer bags themselves are thin-film bags, they can be stored in a much smaller space than conventional molded products such as synthetic resin containers, and at a low cost, they can be stored. The present packaging bag can be used for each item, and can be used as a preferable packaging bag particularly for an object to be contained such as food that requires high hygiene. Further, even if the food is a frozen food containing a large amount of water on the surface and the amount of steam generated during heating is large, the surface of the food after heating does not become sticky, so it is more effective in the case of these frozen foods. is there. Further, if the inner bag and the outer bag are made of a transparent or translucent material, it is possible to cook while observing the cooking condition of food or the like from the outside.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a packaging bag of the present invention.

FIG. 2 is a partially enlarged perspective view showing an embodiment of a packaging bag of the present invention with a part broken away.

FIG. 3 is a perspective view showing an embodiment of the packaged food product of the present invention.

FIG. 4 is a process explanatory view showing an example of the manufacturing method of the present invention.

FIG. 5 is a partially enlarged sectional view of the present invention.

FIG. 6 is a partially enlarged sectional view of the present invention.

FIG. 7 is a partially enlarged sectional view of the present invention.

FIG. 8 is a partially enlarged sectional view of the present invention.

FIG. 9 is a plan view showing another embodiment of the present invention.

[Explanation of symbols]

 1 Inner bag 2 Storage part 3 Outer bag 4 Buffer chamber 5 Welding part 6 Small hole for ventilation 7 Cut end 50 Outer bag base material 51 Inner bag base material 52 Adhesion process 53 Outer edge part 54 Cutting process 55 Opening port A Containment object

Claims (6)

[Claims] 1. An inner bag made of a breathable material, the inside of which serves as a storage portion for foods and other water-retaining objects, and an outer bag made of a non-breathable material which is exterior to the inner bag. The inner and outer bags are integrally bonded to each other, leaving a part thereof, and a buffer chamber is provided between the inner bag and the outer bag, and a ventilation small hole communicating with the outside of the bag is provided. A bag for packaging water-retaining items such as food. 2. The packaging bag according to claim 1, wherein an outer peripheral portion of the bag is provided with an opening portion for accommodating the food or the like in the accommodating portion after the food or the like is accommodated in the accommodating portion. 3. The packaging bag for a water-retaining contained object such as food according to claim 1 or 2, wherein a moisture absorbent is provided in the buffer chamber. 4. An inner bag made of a breathable material, the interior of which serves as a storage portion for foods and other water-retaining objects, and an outer bag made of a non-breathable material, which is external to the inner bag. The inner and outer bags are integrally bonded to each other, leaving a part thereof, and a buffer chamber is provided between the inner bag and the outer bag, and a ventilation small hole communicating with the outside of the bag is provided. A packaged food product in which the food product is enclosed in the storage part of the bag. 5. The food according to claim 4, wherein the food is a frozen food. 6. The food according to claim 4, wherein a hygroscopic agent is provided in the buffer chamber of the bag.