JPH06237743A - Bag for packing water retention type material to be packed such as food or the like and packed food - Google Patents

Abstract

PURPOSE:To obtain a packing bag useful in heating and cooking a water retention type material to be packed, e.g. food such as roasted rice ball or hamburger and a food prepared by packing the material to be packed. constitution. CONSTITUTION:A packing bag comprises an internal bag 1 prepared by making an air-permeable material having the interior as a storage part into a bagged state, an external bag 3 which wraps the internal bag and is obtained by forming an air-nonpermeable material into a bagged state and air-permeable small holes 6 built so as to communicate a cushion room set between the internal bag and the external bag with the outside of the external bag and a food is put in the storage part of the internal bag and the internal bag and the external bag are hermetically sealed to give a packed food.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag for use in packaging and cooking water-retaining materials such as foods represented by grilled rice balls, sushi bread, sushi, hot dogs, and the like. It relates to a food packaged with a product.

[0002]

2. Description of the Related Art Conventionally, when a water-retaining object such as food is heated and cooked in a microwave oven or the like, there is no packaging bag that can be cooked while the object is packaged. However, the water-retaining type of food or the like is directly sealed, or the one placed on a plate and sealed with an airtight film that seals the contained material, and further, a main body and a lid formed of a synthetic resin. There is a so-called steamer, which is a synthetic resin container in which a ventilation hole is formed in an appropriate place of the main body or the lid, and the water-retaining object such as the food is housed and tightly fitted and heated and cooked as it is. .

Further, there are a packaging bag in which a non-breathable material is formed in a bag shape in accordance with an appropriate shape of a food to be housed and the outer periphery is hermetically sealed, and a food packaged with these.

[0004]

However, when a conventional film or synthetic resin container is used, the water vapor released from the object to be contained during storage or cooking adheres to the inner surface of the film or container as water droplets. However, there has been a problem that the water droplets directly adhere to the surface of the object to be contained after heating and the surface of the object to be contained becomes sticky.

In the case of conventional foods packaged in bags, the food cannot be cooked as it is, and the outer bag is breached and the contents to be stored as they are or taken out from the bag are placed on a plate and the film is packaged on the dish. Alternatively, the object is transferred to the synthetic resin container and heated.

[0006]

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides an inner bag made of a breathable material which serves as a storage portion for foods and other water-retaining objects, and an outer bag for the inner bag. , An outer bag made of a non-air-permeable material by providing a buffer chamber between the outer surface of the inner bag and the outer surface of the inner bag by sealing the outer periphery in a hermetic manner, and the inner bag and the outer bag. The gist of the present invention is a bag for packaging water-retaining items such as foods, which consists of a buffer chamber provided between the bags and a ventilation hole provided in communication with the outside of the bags. An inner bag having at least a heat-weldable outer peripheral portion made of a breathable material serving as a storage portion for
The inner bag is covered by the inner bag, and the inner bag and the outer bag material are heat-sealed together or sealed by a film continuous with heat-welding so that the outer circumference of the accommodation part of the inner bag can be kept airtight and watertight. An outer bag made of a non-air-permeable material in which a buffer chamber is provided in whole or in part on the outer surface of the inner bag between the outer surface and the outer bag, and the buffer chamber provided between the inner bag and the outer bag communicates with the outside of the bag. There is proposed a bag for packaging a water-retaining contained object such as food, which comprises a small hole for ventilation provided in the.

As the ventilation small holes, it is conceivable that the entire outer circumference of the bag is heat-welded, leaving the ventilation small holes. It can be provided between the films and between the outer surface of the inner bag film and the inner surface of the outer bag film, and it is formed at the outer bag side end between the outer surface of the inner bag and the inner surface of the outer bag, and its diameter is set to 3 mm to 8 mm.

As the inner bag, a synthetic resin non-woven fabric whose outer peripheral portion can be heat-welded or adhered, or a paper material whose outer peripheral portion can be heat-welded or adhered, and as the outer bag, a polyethylene film and a polyester film are used. A heat-bondable synthetic resin film made by laminating and is used, and a hygroscopic agent may be provided in the buffer chamber.

Further, a food such as a frozen food is enclosed in the accommodating portion of the inner bag to form a packaged food.

[0010]

In the bag for packaging a water-retaining object such as food of the present invention, after the water-retaining object such as a food is contained in an inner bag made of a breathable material, the peripheral edge of the inner bag is Airtight and watertight sealing is performed by an appropriate means such as heat welding. And
The sealed inner bag is further covered with an outer bag made of a non-air-permeable material, and a buffer chamber is formed between the inner bag and the outer surface of the inner bag to seal the outer bag. Further, it is possible to simultaneously seal both of the accommodation ports by a single heat-welding means in which the inner bag and the outer bag have a common sealing portion. As described above, when the contained object is accommodated in the inner bag, that is, the packaged food is heated in a microwave oven or the like, water vapor is released from the surface of the contained object while heating the contained object. This water vapor is accumulated in the buffer chamber between the outer bags through the inner bag, and when the pressure in the buffer chamber exceeds a certain pressure, the water vapor passes through the ventilation small holes communicating with the buffer chamber and the outside of the outer bag. The water droplets discharged to the outside of the outer bag and adhered to the outer surface of the inner bag or the inner surface of the outer bag again accumulate new water vapor in the buffer chamber while remaining in the buffer chamber. By repeating this action, the contained object eventually reaches an appropriate temperature and the heating is stopped. Then, one end of the inner bag is ruptured by an appropriate means, and the contained object cooked at an appropriate temperature is taken out.

[0011]

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 the breathable material, a nonwoven fabric made of a thermoplastic synthetic resin having breathability or a paper material such as Japanese paper can be considered, and it is more preferable that these materials are translucent or opaque. In order to form these breathable materials into a bag shape, use a synthetic resin material that can be heat-welded to the material, or further, the outer peripheral portion of two thin breathable materials having the same shape, that is, the entire inner surface side. For example CP
It is provided by impregnating or adhering a thermoplastic adhesive such as P sealant, or by adhering a heat-weldable film, etc., and if this adhesive or the like is heat-welded to all or all except the opening 55 described later, It is possible to form the inner bag 1 made of a breathable material having the interior as the housing portion 2.

The outer bag 3 is covered with the inner bag 1, and the outer periphery is hermetically sealed so that a buffer chamber 4 is provided between the outer bag 1 and the outer surface of the inner bag 1.
The outer bag is made of a non-breathable material and is provided on the entire outer surface or a part of the outer surface. 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. Similar to the case where the inner bag 1 is formed of these non-breathable materials, the thermoplastic adhesive is applied to the inner surface side of the entire circumference of two non-breathable materials of the same thin film shape or the entire circumference excluding the ventilation small holes described later. If an adhesive or the like is provided by a well-known means and the adhesive is heat-welded to heat the outer circumference of the outer bag 3 to the outer circumference of the inner bag 2, the inner bag 1 can be externally sealed and the outer circumference can be hermetically sealed. The entire outer surface of the inner bag 1 and the inner surface of the outer bag 3 excluding the heat-welded portion are in a non-adhesive state to form the buffer chamber 4.

Further, in the packaging bag shown in FIG. 1, as the thermoplastic adhesive, a material such as a CPP sealant which can penetrate into the material of the inner bag 1 is used. Since it penetrates into the material of the inner bag 1 at the time of heat welding,
Even if an adhesive is not provided on the inner surface of the inner bag 1, the adhesive can be obtained by simply heat-sealing the thermoplastic adhesive or the like provided on the inner surface of the outer bag 4 around the entire circumference except for the small holes for ventilation described later. The inner bag 1 can also be adhered at the same time via the inner bag 1, and the inner bag 1 and the outer bag 3 can be formed in a short time with the entire circumference excluding the ventilation small holes described later being bonded or heat-welded. It should be noted that by leaving a proper place at the time of adhering or welding the outer periphery, an opening port 55 described later for accommodating a water-retaining object such as food is formed in the accommodating portion 2 of the inner bag 1, and the object is accommodated. After that, in order to heat-weld the opening 55 to make the entire circumference airtight, the edge of the opening 55 is also heat-welded with the adhesive or the like shown by the broken line in the drawing or other sealing.

In the figure, 6 is the buffer chamber 4 and / or the inner bag 1.
This is a small hole for ventilation provided so as to communicate with the outside of the bag. As the ventilation small holes 6 of the present embodiment, when the outer bag 3 is formed, a non-adhesive portion is formed at the side end of the heat-welded portion 5 which is heat-welded on the entire circumference except a part thereof. The small holes 6 for ventilation are formed by providing the holes from the inside to the inside. Basically, the vent hole 6 is basically required as long as it has the same effect as the vent 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, the ventilation small hole 6 which is the non-adhesive portion is set to have a diameter of 3 mm to 8 mm as viewed from the front, and the ventilation is combined with the outer bag 3 and the inner bag 1 having a film shape. The small holes 6 are ventilated only 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 value. By having the ventilation holes that can be always ventilated as compared with the conventional ventilation holes that can be always ventilated, the contained object can be heated more quickly and the invasion of outside air can be prevented.

FIG. 3 is a perspective view showing an embodiment of packaged food in which the 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 stored in the storage portion 2, the storage ports are bonded or heat-welded by the same heat-welding means as the heat-welding portion 5 is formed, and the inner bag 1 and the outer bag 3 are completely surrounded. And seal the packaging bag. However, since the items to be contained are foods, the materials for the inner surfaces 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 packaging bag for the 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. The inner bag base materials 51, 51 are arranged side by side, the inner bag base materials 51, 51 are superposed, and the outer bag base materials 50, 50 are interposed 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 to be the heat-welded portion 5 excluding the ventilation small holes 6 is provided, and in this adhesion step 52, both base materials 50, 51 are welded. Further, by providing a cutting step 54 that 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. Incidentally, the outer edge portion
When the outer side of 53 is cut, a slightly non-adhesive portion is formed on the outer side of the outer edge portion 53, but the non-adhesive portion formed here is naturally included as a concept of the welding portion described in the present invention. Is. Then, if food or the like is placed through the opening 55 of the packaging bag formed as described above and the opening 55 is further sealed through the heat welding process, the packed food shown in FIG. Can be 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 object A to be contained is outwardly generated as water vapor as water vapor as shown by an arrow in the figure, and the water vapor passes through the inner bag 1 and comes into contact with 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 is inflated, 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 pressure in the buffer chamber 4 becomes constant, the small vent 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. This operation is repeated until the contained object A has an appropriate temperature. At this time, although water vapor is released from the vent hole 6 to the outside of the outer bag 3, it is not completely released, but water is attached to the inner surface of the outer bag 3 or the outer surface of the inner bag 1, that is, the buffer chamber 4 as water droplets. To remain. Since the water droplets are prevented from penetrating into the inside by the material of the inner bag 1, moisture does not directly adhere to the surface of the article A to be adhered and sticky. However, when a non-woven fabric or a paper material is used as the inner bag 1, there is a possibility that the inner bag 1 absorbs water and reaches the surface of the object 1 to be contained, but the inner bag 1 is Not all the water in the buffer chamber 4 flows back and adheres because it absorbs water. If a minute amount of water is not required, a moisture absorbent (not shown) may be provided in the buffer chamber 4 to completely prevent the moisture from being absorbed by the moisture absorbent and permeating into the inner bag 1. . Further, if the outer bag 3 and the inner bag 1 are made of transparent material, 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 cooking. In this way, after the contained object A is heated to an appropriate temperature, it is taken out from the microwave oven or the like and one end of the inner bag 1 is cut with scissors or the like to take out the cooked contained object A. In addition, the inner bag 1 is previously attached to the end of the packaging bag.
If the cut end 7 for opening one end or other cutting means is provided, the stored object A can be easily taken out without using scissors or the like.

Further, the inner bag 1 and the outer bag 5 of this embodiment can be appropriately shaped depending on the shape of the object 1 to be housed. For example, as in the other embodiment shown in FIG. It goes without saying that things can also be molded.

[0019]

As described above, in the bag for packaging water-retaining contained objects such as food and the packaged food of the present invention configured as described above, the contained object contained in the inner bag is cooked by, for example, a microwave oven. By doing so, it is possible to release the generated water vapor to the outside while maintaining the same heat retention as a conventional film simply covered on the object to be contained, and to prevent outside air from entering during the storage. Keeps the freshness of the product, adjusts the amount of water, and prevents water droplets adhering to the inside of the buffer chamber from directly adhering to the above-mentioned contained object by the inner bag, preventing the surface of the contained object after heating from sticking due to moisture. it can. Also, since the inner bag and the outer bag are themselves thin-film-shaped, they can be stored in a much narrower space and are cheaper than an integrally molded product such as a conventional synthetic resin container, and are inexpensive. The present packaging bag can be used for each case, and it can be used as a preferable packaging bag particularly for an object to be contained such as food that requires high hygiene. Further, in the case of a frozen food containing a large amount of water on its surface as a food, even if the amount of steam generated during heating is large, the surface of the contained object after heating is not sticky and is more effective. Further, if the inner bag and the outer bag are made of a transparent or translucent material, it is possible to cook while visually observing the cooking condition of the contained object 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 (21)

[Claims] 1. An inner bag made of a breathable material, the inside of which serves as a housing for foods and other water-retaining objects, and the inside of the inner bag, the outer bag being sealed and the outer circumference being hermetically sealed. An outer bag made of a non-air-permeable material in which a buffer chamber is provided between the outer surface of the bag and the entire outer surface of the inner bag, and a buffer chamber provided between the inner bag and the outer bag communicates with the outside of the bag. A bag for packaging a water-retaining type of food or the like, which comprises a small hole for ventilation provided in a shape of. 2. An inner bag which is made of a breathable material and has an outer peripheral portion capable of being heat-welded, the inner bag being made of a breathable material, the inner portion of which serves as a housing for food and other water-retaining objects, and an inner bag which is externally attached to the inner bag. By sealing the inner bag and outer bag materials by heat welding to each other so that the entire outer peripheral surface of the housing part of the inner bag can be kept airtight and watertight, a buffer chamber is formed between the outer surface of the inner bag and the outer surface of the inner bag or one of them. An outer bag made of a non-breathable material that is provided over the entire section, and a vent hole that is provided so as to communicate with the outside of the bag from the buffer chamber that is provided between the inner bag and the outer bag. A bag for packaging contained items. 3. The packaging bag for a water-retaining object such as food according to claim 1 or 2, wherein the entire outer periphery of the bag is heat-welded while leaving a small vent hole. 4. The ventilation holes are provided in the same heat-welded portion on the outer circumference of the inner bag and the outer bag, and between the inner bag films and between the outer surface of the inner bag film and the inner surface of the outer bag film.
Or the packaging bag described in 3. 5. The water-retaining object, such as food, according to claim 1, 2, 3 or 4, wherein the ventilation small holes are formed between the outer bag inner surface and the outer bag side end. Packaging bag. 6. The bag for packaging a water-retaining object such as food according to claim 1, 2, 3, 4 or 5, wherein the diameter of the vent holes is 3 mm to 8 mm. 7. The inner bag is made of a synthetic resin non-woven fabric whose outer peripheral portion can be heat-welded or adhered, or a paper material whose outer peripheral portion can be heat-welded or adhered. 5
Or a packaging bag for a water-retaining contained object such as food. 8. A bag for packaging a water-retaining object such as food according to claim 1, 2, 3, 4, 5, 6 or 7, wherein a synthetic resin film capable of being heat-welded is used as the outer bag. . 9. The bag for packaging a water-retaining object such as food according to claim 8, wherein the outer bag is formed by laminating a polyethylene film and a polyester film. 10. The buffer chamber is provided with a hygroscopic agent, 1.
A bag for packaging a water-retaining contained object such as food according to 2, 3, 4, 5, 6, 7, 8 or 9. 11. An inner bag made of a breathable material, the inner part of which serves as a housing for food and other water-retaining objects, and the inner bag is covered by an outer bag and the outer circumference is hermetically sealed. An outer bag made of a non-air-permeable material in which a buffer chamber is provided between the outer surface of the bag and the entire outer surface of the inner bag, and a buffer chamber provided between the inner bag and the outer bag communicates with the outside of the bag. A packaged food product, comprising: a ventilation small hole formed in a shape of a circle; and a food product enclosed in a housing portion of the inner bag. 12. An inner bag, which is made of a breathable material having an interior serving as a storage portion for food, and an outer peripheral portion of which is heat-welded, and the outer bag is covered with the inner bag, and the entire outer peripheral surface of the storage portion of the inner bag is airtight and watertight. It is made of non-breathable material by providing a buffer chamber between the inner bag outer surface and the outer surface by sealing the inner and outer bag materials with each other by heat welding so that it can be maintained An outer bag, an aeration small hole provided in communication with the outside of the bag from a buffer chamber provided between the inner bag and the outer bag, and food enclosed in the accommodation portion of the inner bag. Packaged food. 13. The packaged food product according to claim 11, wherein the entire outer circumference of the bag is heat-welded while leaving the vent holes. 14. The ventilation holes are provided in the same heat-sealed portion of the outer circumference of the inner bag and the outer bag, and between the inner bag films and between the outer surface of the inner bag film and the inner surface of the outer bag film.
Or the packaged food according to 13 above. 15. The packaged food product according to claim 11, 12, 13 or 14, wherein the ventilation small holes are formed at the outer bag side end and between the outer surface of the inner bag and the inner surface of the outer bag. 16. The packaged food according to claim 11, 12, 13, 14, or 15, wherein the diameter of the vent holes is set to 3 mm to 8 mm. 17. The inner bag is made of a synthetic resin non-woven fabric capable of heat welding or adhering the outer peripheral portion, or a paper material capable of heat welding or adhering the outer peripheral portion. 15
Or the packaged food according to 16. 18. A frozen food is used as the food 11,
Packaged food according to 12, 13, 14, 15, 16 or 17. 19. The outer bag is made of a heat-weldable synthetic resin film, 11, 12, 13, 14, 15, 16,
The packaged food according to 17 or 18. 20. The packaged food according to claim 19, wherein the outer bag is formed by laminating a polyethylene film and a polyester film. 21. A hygroscopic agent is provided in the buffer chamber,
Packaged food according to 12, 13, 14, 15, 16, 17, 18, 19 or 20.