JP2000335655A - Bag for food - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a bag which hermetically packs juicy food therein usable at the time of using its contents for heating or cooking safely by a microwave oven or the like with an appropriate internal pressure applied and the bag being used as it is. SOLUTION: A food packing bag 100 is formed in a shape of standing pouch by using a laminated film mainly made up of plastics, and exhaust passages 9 and 9 each in a zigzagged structure with its front end sealed up are provided with an edge part at the lateral on one side is, for instance, heat sealed with an exhaust passage forming seal part 6, and an incision 8a is provided at an unsealing part at the front end of the exhaust passages 9 and 9 with a notch 7a formed at its end. The incision 8b for forming a port for taking out contents is provided at an edge part at the upper part of the bag with the notch 7b formed at its end.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a food bag,
More specifically, food containing moisture such as frozen distribution or chilled distribution is sealed and packaged, and provided for distribution.When the contents are used, the contents are thawed by a heating means such as a microwave oven using the bag, The present invention relates to a food bag that can be satisfactorily heated or cooked.

[0002]

2. Description of the Related Art Conventionally, foods containing moisture such as frozen distribution and chilled distribution are sealed and packaged for distribution, and when the contents are used,
As a food bag capable of performing thawing, heating, or cooking of the contents by a heating means such as a microwave oven using the bag, for example, using an easy-peeling resin in a sealant layer of the bag. Due to the heat and internal pressure of steam generated at the time of heating, a part of the heat seal portion at the edge such as the periphery of the bag is peeled off, so that the steam can escape or a part of the bag can be ventilated. There is a bag or the like in which an adhesive label is attached so as to cover the hole and sealed, and the label is peeled off by the adhesive layer and the vapor is released by the heat and internal pressure of steam generated during heating. Was.

[0003] However, in a bag made by using an easy-peeling resin for the sealant layer, the heat seal portion can be peeled off by steam generated at the time of heating, and the steam can be released. Is difficult to adjust, the internal pressure is completely released once it is opened, the internal pressure cannot be adjusted to a certain range, and the heat seal part around the bag etc. opens relatively large so that the contents leak. And spilled.

Further, a hole for ventilation is provided in a part of the bag,
In the bag whose hole is sealed with an adhesive label, the position where the hole is provided can be freely selected, so it is easy to take countermeasures against leakage of the contents, etc. At the same time, if the ventilation hole is too small, the pressure-sensitive adhesive label is difficult to peel off, and if it is too large, it is difficult to adjust the internal pressure after peeling.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to disclose not only water at normal temperature but also water at freezing and chilled distribution. It is a bag that can be distributed in a sealed package containing food, without food hygiene problems,
In addition, when the contents are used, the contents can be thawed, heated, or cooked safely by simple operation using a heating means such as a microwave oven using the bag while applying an appropriate internal pressure. An object of the present invention is to provide a food bag excellent in usability with high productivity.

[0006]

The above objects can be attained by the present invention described below. That is, the invention described in claim 1 is a bag for sealingly packaging a food containing water, wherein the bag is formed in a standing pouch format, and is provided at one of the upper, lower, left and right edge portions of the bag. In addition, when the food stored in the bag is heated together with the bag, the food bag is provided with a bent exhaust path for adjusting the internal pressure of the rising bag to a certain range.

In the present invention, when the steam generated from the contents is discharged to the outside through the exhaust path, a pressure loss occurs in the exhaust path having the bent structure, and a proper internal pressure is maintained in the bag. The structure such as the width and length of the exhaust path, the shape and number of the bent portion is not particularly limited, and the contents to be packaged and the amount of water therein, and heating such as a microwave oven are provided. Depending on the conditions, it can be appropriately determined within a range in which an appropriate internal pressure is maintained.

Further, in the food bag of the present invention, the outer end of the exhaust passage is sealed by heat sealing before heating the contents, and the outer end of the exhaust passage is heated for the first time when the contents are heated. The heat seal portion is cut off and opened, and the exhaust passage is used so as to communicate with the outside.

By adopting such a configuration, the food bag is of a standing pouch type, and the bottom is formed of a gusset type in which a bottom film is folded inward, so that it is basically self-supporting. Easy to handle,
It has a compact outer shape for its internal capacity. And the filled contents are sealed and packaged at the distribution stage,
Safely protected. Also, when using the filled contents, the exhaust path, just cut off the heat seal portion of the outer end thereof and open, the exhaust path communicates with the outside,
The internal pressure during heating can be adjusted. Therefore, the contents can be heated in a microwave oven or the like while being stored in the bag, and at that time, heating can be performed while applying an appropriate internal pressure, so that the whole can be thawed, heated, or cooked without unevenness in a short time. .

[0010] In particular, when the exhaust path is provided at the top or side edge of the bag, the bag is self-supporting.
It can be heated in a microwave oven or the like with the bag upright, and at that time, since the exhaust path is at a relatively high position, even if the content is food containing a lot of liquids, it will not spill over It can be safely heated or cooked. Furthermore, since the legs are formed by the bottom seal portion on the outer periphery of the bottom surface of the bag, when heating in a microwave oven,
Heating is performed with the bottom surface lifted slightly from the rotating tray, so that the heating efficiency is good and the whole can be uniformly heated.

The exhaust path may be provided at the lower edge of the bag. In this case, at least one of the gussets at the bottom of the standing pouch is extended so that the exhaust path is provided at the end of the bottom seal. It can be provided so as to communicate with the inside of the bag. However, in this case, the bag will be laid down because the independence of the bag will be impaired.However, when heating the contents, the stability is improved by heating the bag with the exhaust path facing up. Also, since the bag has a large thickness, it can be heated or cooked safely as described above.

[0012] In the invention described in claim 2, the food bag is preferably made of a linear low-density polyethylene, an ethylene / α-olefin copolymer polymerized using a single-site catalyst, or a polypropylene as an innermost layer. The food bag according to claim 1, wherein the bag is formed of a laminated film serving as a sealant layer).

As the food bag of the present invention, various laminated films in which a sealant layer is laminated on the innermost layer can be used as in the case of a normal food bag. In order to heat, it is preferable that the sealant layer is excellent in heat resistance, content resistance, low odor, and heat resistance. From this point, linear low-density polyethylene, ethylene-α polymerized using a single-site catalyst
-A laminated film having any one of an olefin copolymer and polypropylene as the innermost layer is particularly suitable.

Therefore, by adopting such a configuration, in addition to the functions and effects of the invention described in the first aspect,
Thawing, heating, cooking, and the like can be performed more safely without transferring the resin odor or the like to the contents and impairing the flavor.

The invention according to claim 3 is the food bag according to claim 1 or 2, wherein the innermost surface of the food bag is formed in a shape having fine irregularities. . The fine irregularities are, for example, 0.5 to 1 in height.
Irregularities of about 5 μm are preferred, and irregularities of 2 to 10 μm are more preferred.

When the innermost surface of the bag is smooth, the inner surfaces of the laminated films on both sides tend to adhere to each other and the opening of the bag deteriorates. This becomes more remarkable when the bag is curled.

Therefore, by adopting the above configuration, in addition to the effects of the invention described in claim 1 or 2, the opening of the bag itself is improved, and the filling seal for filling the contents is provided. In addition to improving the machine suitability and productivity of the machine, air also remains in the bag exhaust path due to the unevenness, so that the inner surfaces do not adhere to each other, and the steam generated by heating the contents is Since the gas easily enters the exhaust path with the internal pressure and the exhaust path is smoothly opened, the internal pressure adjusting function works reliably, and the heating and cooking can be performed satisfactorily without breaking the bag.

According to a fourth aspect of the present invention, there is provided a food bag, wherein a cut line for cutting and opening the sealed portion at the outer end of the exhaust path before heating the content, and the content after heating. There is a cutout line for the outlet for taking out
The food bag according to any one of claims 1 to 3, wherein an easy-opening means is provided on the perforated line.

[0019] The food bag of the present invention, when heating the contents,
First, in order to work the internal pressure adjustment function of the exhaust path, cut and open the heat seal portion at the outer end of the exhaust path, and then heat or cook the contents while applying a predetermined internal pressure with a microwave oven or the like, Thereafter, one end of the bag is cut off and used as a takeout opening for the contents.

Therefore, in order to avoid erroneous use, it is preferable to display a cut line at the opening position of the exhaust path and the contents take-out port by printing or the like. Is preferably provided. As the easy-opening means, in addition to the notch commonly used in ordinary bags, a half-cut line by laser light irradiation or the like, or lamination of a uniaxially stretched film (so that the stretching direction matches the direction of the cut-out line) Lamination), cut tape pasting, etc., and these may be used alone, or a combination of plural such as lamination of notch and half-cut line, or uniaxially stretched film, or cut tape pasting Can be used.

By adopting such a configuration, in addition to the functions and effects of the invention described in any one of claims 1 to 3, the position of the cut line becomes clear, and at the same time, the tear line is easily torn by hand at an appropriate position. Can be opened.

According to a fifth aspect of the present invention, the cutout line of the content take-out port is provided at an edge adjacent to the edge provided with the exhaust path or inside the exhaust path. The food bag according to claim 4, wherein:

The cutout line of the contents take-out opening can be taken out at any position of the bag, but, for example, the contents can be taken out at the end opposite to the end provided with the exhaust path. In the case where a cutout line is provided for the material take-out port, the exhaust path goes down at the time of unsealing, so that if the content contains a liquid substance, there is a risk of leakage from the opened exhaust path. Therefore, by adopting the above configuration, in addition to the effects of the invention described in claim 4, even if the content is a food containing a liquid material, the content does not leak and the content is safely taken out. be able to.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a film used for a food bag according to the present invention and a method for manufacturing the bag will be described. First, a film used for the food bag of the present invention is mainly a laminated film mainly composed of plastic, and from the viewpoint of heatability by a microwave oven, a metal layer such as an aluminum foil or an aluminum vapor-deposited layer must be laminated. If it is not particularly limited, any known laminated film used for packaging bags for foods containing water and other liquid components can be used, depending on the type of contents to be packaged and the use conditions after filling. A suitable material can be freely selected and used. However, regarding the sealant layer,
In view of the above, it is preferable to use any of linear low-density polyethylene, ethylene / α-olefin copolymer polymerized using a single-site catalyst, and polypropylene.

As a typical example of the structure of the laminated film,
The following configuration is given. (1) ON film / adhesive / L / LDPE film (sealant layer) (2) ON film / adhesive / PET film / adhesive /
L / LDPE film (sealant layer) (3) ON film / adhesive / PET film / adhesive /
CPP film (sealant layer) (4) ON film / adhesive / biaxially stretched HDPE film / adhesive / L / LDPE film (sealant layer) (5) ON film / adhesive / OPP film / adhesive /
L-LDPE film (sealant layer) (6) ON film (silica or alumina deposited layer) / adhesive / biaxially stretched HDPE film / adhesive / L-LDP
E film (sealant layer) (7) ON film / anchor coat layer / co-extrusion coat layer (HDPE layer / L / LDPE layer) (sealant layer is L / LDPE layer) (8) ON film / anchor coat layer / co-extrusion Coat layer (HDPE layer / LDPE layer) / adhesive / L-LDP
E film (sealant layer) (9) PET film / adhesive / L / LDPE film (sealant layer) (10) PET film / adhesive / ON film / adhesive /
L / LDPE film (sealant layer) (11) PET film / adhesive / (silica or alumina deposited layer) ON film / adhesive / L / LDPE film (sealant layer) (12) PET film / adhesive / ON film / adhesive/
CPP film (sealant layer) (13) PET film / adhesive / EVOH film / adhesive / ON film / adhesive / CPP film (sealant layer), but not limited thereto, various combinations Can be used.

In the above, the ON film is a biaxially stretched nylon film, the OPP film is a biaxially stretched polypropylene film, the PET film is a biaxially stretched polyethylene terephthalate film, the L / LDPE is a linear low density polyethylene, and the HDPE is a high density polyethylene. , LDP
E is a low-density polyethylene, a CPP film is a cast (unstretched) polypropylene film, and an EVOH film is a saponified ethylene-vinyl acetate copolymer film. The anchor coat is a kind of primer coat that is previously coated on the base film side in order to improve adhesiveness when laminating a resin by extrusion coating.

Further, in the above, L ·
The LDPE film and the CPP film can be replaced with an ethylene / α-olefin copolymer polymerized using a single-site catalyst. These sealant layers, as described above, in addition to laminating a film formed in advance by a dry lamination method using an adhesive,
Lamination can also be performed by an extrusion coating method or the like.

In the construction of the laminated film, ON
Film, PET film, when used for the outermost layer,
When a food bag is given a mechanical strength or printability as a base film and is used for an intermediate layer, it is mainly used to reinforce the mechanical strength. The biaxially stretched HDPE film and the OPP film used for the intermediate layer are used to increase the thickness and rigidity and at the same time to improve the moisture permeability. The biaxially stretched HDPE film and the OPP film can be a uniaxially stretched HDPE film and a uniaxially stretched PP film. In this case, the films are laminated so that the stretching direction matches the direction of the cutout line of the bag. This facilitates the tearing and stabilizes the direction. However, it is preferable to use a biaxially stretched film when the cut line of the bag is in both the vertical and horizontal directions of the bag.

Then, a silica or alumina deposition layer, E
The VOH film is laminated in order to improve the gas barrier property. In addition, a gas barrier material such as a polyacrylonitrile film or a polyvinylidene chloride coating layer can be laminated.

As the sealant layer, L·LD
PE film, CPP film, ethylene / α-olefin copolymer polymerized using single-site catalyst
Although examples of the types are given, the L-LDPE film is excellent in heat sealing stability, content resistance, stress cracking resistance, and the like, and the CPP film is excellent in heat resistance and low odor. In addition, ethylene-α-olefin copolymers polymerized using a single-site catalyst such as a metallocene catalyst have a narrow molecular weight distribution and a stable copolymerization ratio. It is excellent in properties and particularly low in odor. Therefore, by selecting and using the most suitable one according to the type of the content (food) to be packaged and the use conditions, the flavor of the content is not impaired by resin odor and the like, and the safety and performance are excellent. Food bags can be manufactured.

In addition to the above, the sealant layer may be made of ordinary low-density polyethylene such as high-pressure polyethylene, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / acrylic ester copolymer, ionomer,
A polyester resin or the like can be appropriately selected and used.

Next, a method for producing a food bag of the present invention produced using the above-described laminated film will be described. As described above, the food bag of the present invention is a standing pouch-type bag that hermetically seals and packs food containing water, and is stored inside the bag at any of the upper, lower, left, and right edges. When heating the food together with the bag, the structure is basically provided with a bent structure exhaust path for adjusting the internal pressure of the rising bag to a certain range, and as the shape of the bag,
On the innermost surface of the bag (the surface of the sealant layer), fine irregularities for preventing adhesion between the inner surfaces, specifically, a height of 0.5 to 1
A configuration having 5 μm irregularities, and a cutout line for cutting and opening the sealed portion at the outer end of the exhaust path before heating the contents, and taking out the heated contents in the bag. And a cutout line for the content take-out port for providing a easy-opening means such as a notch, a half-cut line, and the cut-out line for the content take-out port. The configuration includes an edge portion adjacent to an edge portion provided with a passage or a configuration provided inside an exhaust passage.

Such a food bag is an application form of a standing pouch, and a heat sealing device for forming the exhaust passage therethrough using a conventionally known standing pouch bag making machine, and a notch, It can be easily manufactured by adding a punching device for providing easy-opening means such as a half-cut line, a laser beam irradiation device, and the like.

The method for providing the fine irregularities on the innermost surface of the bag (the surface of the sealant layer) may be performed by using an embossing means. Alternatively, when the sealant layer of the laminated film is laminated by extrusion coating. Can be easily molded by laminating using a chill roll having fine irregularities on the surface. As still another method, the unevenness can be formed by a method in which particles such as silica are added to the resin of the sealant layer to form a film.

The food bag of the present invention is a standing pouch type bag. The same laminated film is folded back to form a body and a bottom, and the bag can be made. By separately preparing a laminated film for the bottom and a laminated film for the bottom forming the bottom, and inserting the laminated film for the bottom between the front and rear two side laminated films so as to be folded inward. can do. In this case, the bottom laminate film can be made thinner than the wall laminate film, thereby improving the economic efficiency and the difference in thickness due to the difference in film overlap between the body and bottom of the bag. , The stability of heat sealing at the boundary portion is improved, and the inclination when bags are stacked in the bag supply section of the filling and sealing machine is reduced, so that workability and machine suitability can be improved. In addition, the fine irregularities provided on the innermost surface of the bag, that is, on the surface of the sealant layer of the laminated film are preferably provided on the laminated film for the wall surface, but may be omitted in the laminated film for the bottom surface.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below more specifically with reference to the drawings. However, the present invention is not limited to these drawings. 1 to 3 are front views each showing a configuration of an embodiment of the food bag of the present invention.

FIG. 1 is a front view showing the structure of a food bag according to a first embodiment of the present invention, in which the width of one side of a side seal portion of a standing pouch type bag is increased, and the internal pressure is adjusted at that portion. The exhaust passage having a bent structure is provided. That is, in FIG. 1, the bottom bag 2 is inserted between the front and rear wall film 1 and the bottom film having the bottom film cutouts 4, 4 provided on both sides is inserted into the food bag 100 in FIG. 1. Then, it is heat-sealed by the bottom seal portion 3 of the ship bottom shape to be formed into a shape having a gusset portion, and the trunk portion of the bag 100 is one of the two side edges of the front and rear two wall films 1 ( The left side in the figure) is heat-sealed with a side seal portion 5 having a predetermined width, similarly to a normal standing pouch, and the other side (the right side in the figure).
Is a seal pattern capable of enlarging the width of the side seal portion and forming a bent structure of the exhaust passages 9, 9 and sealing the tip end thereof, that is, a heat seal formed by the exhaust passage forming seal portion 6. It is a bag that is sealed and formed with an open top. Although the exhaust path forming seal portion 6 has a shape in which exhaust paths 9 and 9 are formed over substantially the entire length of the side portion of the bag 100 in the drawing, depending on the length of the bag, for example, the exhaust path 9 may be used. ,
9 may be formed in a part of the upper side.

The upper opening is heat-sealed by the upper seal portion 10. Before filling the contents, the opening is unsealed, and after filling the contents from this portion, the contents are heat-sealed and sealed. Is what you do. And the food bag 100
A cut line 8a indicating the opening position of the exhaust passages 9, 9 and a notch 7a at the end thereof are provided at the end of the right side of the exhaust passages 9, 9, that is, at the end where the exhaust passages 9, 9 are provided. In addition, a cutout line 8b of a contents take-out opening indicating an unsealing position at the time of taking out contents after heating is provided at a position below the upper seal portion 10 at an upper edge of the bag 100, and an end thereof. The configuration is such that a notch 7b is provided in the portion.

The cut lines 8a and 8b may be displayed only by printing, but may be further provided with an easy-opening means such as a half-cut line or the application of a cut tape to the notches 7a and 7b.
It can be provided in combination with b. This applies to the food bags 200 and 300 shown in FIGS. 2 and 3 below. Although not shown in the figure, the food bag 1
00, the innermost surface is preferably formed in a shape having the fine irregularities. In this case, the fine irregularities may be provided on both the sealant layer surface of the wall film 1 and the sealant layer surface of the bottom film. Also, wall film 1
Fine irregularities may be provided only on the surface of the sealant layer. This point also applies to the food bags 200, 30 shown in FIGS.
The same applies to 0.

By adopting such a configuration, the food bag 100 is a standing pouch type bag, is self-supporting and easy to handle, and has fine irregularities on the innermost surface of the bag. Has good openability and excellent suitability for filling the contents, and the contents (food containing water) can be safely sealed, packaged, and distributed. When the contents are used, the heat seal portion at the tip of the exhaust passages 9, 9 can be easily cut out along the cutting line 8a by using the notch 7a. The package is opened at the tip, and the internal pressure adjusting function can be operated.

Accordingly, the bag 100 in this state is put in a microwave oven or the like as it is, and the contents are heated, so that the internal pressure of the bag gradually increases due to the steam generated from the contents, and the constant pressure is maintained. When the internal pressure is reached, the exhaust paths 9 and 9 are opened, and the steam is discharged to the outside along the path indicated by the arrow.
At this time, since fine irregularities are also provided on the innermost surfaces of the exhaust passages 9, 9, the inner surfaces do not adhere to each other, and the exhaust passages 9, 9 are opened smoothly as the internal pressure increases.

The width of the exhaust passages 9 is small.
In addition, due to the bent structure, when steam is discharged, a pressure loss occurs, and the inside of the bag 100 is kept at a constant pressure. Therefore, the contents can be heated while applying an appropriate pressure of the heating steam, so that the heating or cooking suitable for the contents can be performed in a short time with less temperature unevenness. In addition, since the exhaust passages 9 and 9 are located at a relatively high position during heating, even if the content is a food containing a large amount of liquid material, the food does not spill over.

Further, when removing the contents after heating or cooking, the upper edge of the bag 100 is easily cut along the cut line 8b by using the notch 7b provided in this portion. Since it can be opened, the exhaust paths 9, 9
Can be safely taken out without spilling even if the contents include a liquid material.

FIG. 2 is a front view showing the structure of a food bag according to a second embodiment of the present invention. Food bag 20 shown in FIG.
In the configuration of the food bag 100 shown in FIG. 1, the position of the exhaust path forming seal portion 6 that forms the exhaust paths 9, 9 is set from the side edge to the upper part of the food bag 200. Change to the edge, and underneath the cut line 8
b, and a notch 7b at the end thereof.

The food bag 200 having such a structure is formed in the same manner as a normal standing pouch to form a bottom portion 2 and a body portion, and the upper edge is formed by the seal pattern of the exhaust passage forming seal portion 6. It can be manufactured by heat sealing. However, when such a configuration is employed, although not shown in the drawings, the following method can be employed as a method of providing the content filling port, that is, a method of filling the content. In the first method, the exhaust path forming seal portion 6 at the upper edge of the bag 200 is used as an unsealed opening (filling port) before filling the contents, and after filling the contents from this portion, This is a method of performing heat sealing with the seal pattern of the exhaust passage forming seal portion 6 using a filling and sealing machine to seal.

In the second method, the exhaust passage forming seal portion 6 at the upper edge of the bag 200 is heat-sealed in advance at the time of bag making, and either the left or right side seal portion 5 is entirely or This is a method in which a part is set as an unsealed opening (filling port), the contents are filled from this part with a filling and sealing machine, and the side opening is heat-sealed and sealed. As yet another method, when the size of the bag 200 in the width direction is relatively large, the exhaust path forming seal portion 6 at the upper end portion is formed to be moved to one side, and that portion is heat-sealed in advance during bag making. In this method, the remaining portion is set as an unsealed opening, and after filling the content from this portion, heat sealing is performed.

By any of the above methods, the contents can be filled and sealed, and by adopting such a structure, the same operation and effect as those of the food bag 100 having the structure shown in FIG. 1 can be obtained. Obtainable.

FIG. 3 is a front view showing the configuration of a third embodiment of the food bag according to the present invention. Food bag 30 shown in FIG.
In the configuration of the food bag 100 shown in FIG. 1, reference numeral 0 denotes an exhaust passage forming seal portion 6 provided at an edge of a side portion of the bag.
And its cut line 8a and its notch 7a
The lower edge portion of the bag 300, that is, the position below the bottom seal portion of the bottom of the ship, is changed, and the position of the cutout line 8b of the content outlet is changed to the edge portion of the side portion of the bag (the right side in the figure). The notch 7b provided at the end is also changed to the upper end. The upper seal portion 10 of the bag 300 is an unsealed opening before filling the contents, and after filling the contents from this portion, heat sealing is performed. In addition, the cutout line 8b and the notch 7b of the content take-out opening may be provided at the left edge of the bag 300.

In such a configuration, the bag 300
The type is a standing pouch type, but since the film at the bottom gusset is extended and the exhaust path forming seal part is provided at that part, there is no self-supporting, and the thickness of the gusset part bag is used, but it is laid down It is assumed that it is used for In the above configuration, the seal pattern of the bottom portion 2, that is, the seal pattern of the bottom seal portion 3 has a shape in which an exhaust passage forming seal portion is extended below a bottom seal portion of a ship bottom shape, as illustrated. In addition, the bottom of the ship bottom-shaped seal portion and the inlets of the exhaust passages 9 and 9 of the exhaust passage forming seal portion communicate with each other.

Such a bottom seal portion 3 may be provided on at least one of the two sets of films before and after the bottom gusset portion. As shown in the figure, the bottom seal portion 3 is provided on the front film. The film on the back side may be heat-sealed with a ship-bottom seal pattern having the same shape as the bottom seal portion 3 of the food bag 200 shown in FIG. At this time, the film at the bottom on the back side may be extended by the length of the exhaust path forming seal portion as in the case of the front side, and that portion may be entirely sealed with a solid seal, or without being extended. You may. When the film at the bottom on the back side is also extended to the same length as the front side, it is heat-sealed with the same seal pattern of the bottom seal part 3 as on the front side to form one of the exhaust paths 9,
May be used. As described above, the exhaust passage 9,
9 is provided at the lower edge of the bag, FIG.
In the food bags 100, 200 shown in FIG. 4, the bottom film cutouts 4, 4 provided on both sides of the bottom film.
Does not need to be provided, and the gusset at the bottom has a shape that opens freely on both sides when the contents are filled.

By adopting such a configuration, the food bag 300 is not self-supporting, but the content is safely sealed and packaged similarly to the food bags 100 and 200 shown in FIGS. Can be distributed. When the contents are used, the heat sealing portion at the tip of the exhaust passages 9 and 9 can be easily cut out along the cut line 8a by using the notch 7a. 9 is opened, and the internal pressure adjusting function becomes operable.

Therefore, the bag 300 in this state is laid down in a microwave oven or the like so that the exhaust passages 9 and 9 face upward, and the contents are heated. When the internal pressure gradually rises and reaches a certain internal pressure, the exhaust passages 9 and 9 are opened, and steam is discharged to the outside through a route indicated by an arrow. At this time, since fine irregularities are also provided on the innermost surfaces of the exhaust passages 9, 9, the inner surfaces do not adhere to each other, and the exhaust passages 9, 9 are smoothly opened as the internal pressure increases. . Since the exhaust passages 9 and 9 have a narrow width and a bent structure, a pressure loss occurs when steam is discharged to the outside, and the inside of the bag 300 is maintained at a constant pressure.

Therefore, since the contents can be heated while applying an appropriate pressure by the heating steam, temperature unevenness is small and heating or cooking suitable for the contents can be performed in a short time. In addition, since the exhaust passages 9 and 9 are on the upper side during heating, even if the content is a food containing a large amount of liquid material, the food does not spill over.

(Test Example 1) As a food bag of the present invention, a food bag having the structure shown in FIG. 1 was prepared, and its wall surface film (laminated film) was prepared with the following structure.
Using a 12 μm thick PET film for the outermost substrate film and a 15 μm thick ON film for the intermediate layer,
70 μm thick L-LDPE for the innermost sealant layer
Using a film, the inner surface (laminated surface) of the PET film of the outermost layer is subjected to gravure printing of four colors of pattern printing (including the printing of cutout lines), and then each film is subjected to dry lamination to form a two-component polyurethane system. Laminated using a curable adhesive, and the innermost layer L-LDP
On the entire surface of the E film, irregularities having a shape in which convex parts having a height of 10 μm and a height of 10 μm are arranged at intervals of 0.7 mm around the square by a hot embossing method are formed on the entire surface of the E film, and are used for wall surfaces. A laminated film was produced. Further, in the laminated film for the bottom, in the configuration of the laminated film,
A laminate film having a configuration in which printing on the PET film was removed and only the thickness of the innermost sealant layer was changed to 50 μm was prepared as a bottom film.

Using the above-mentioned wall film and bottom film, the dimensions of each part were set as follows by a standing pouch bag making machine to produce a food bag having the structure shown in FIG. The external dimensions of the bag are 180 mm in width and 220 mm in length, and the exhaust path forming seal section 6 on the right side of the bag is provided with an exhaust path forming seal section having the illustrated shape in a space of 40 mm in width and 180 mm in length. 6, and the bottom seal portion 3 of the bottom portion 2 has a width of 180 mm and a length of 40 mm (same as the folding depth of the bottom film), and aligns the bottom seal portion 3 in the illustrated shape with the cut lines 8a and 8b, respectively. And formed by heat sealing. The notches 7a and 7b at the ends of the cut lines 8a and 8b are cut by using a punching device separately prepared after cutting each bag.
Each was provided at a predetermined position. The width of the exhaust passages 9 of the exhaust passage forming seal portion 6 was 8 mm at the minimum.

After filling and sealing the food bag prepared as described above with frozen omurice as the content, the heat-sealed portion at the end of the exhaust path is cut along the cut line 8a and opened, and the bag is filled with 500 W of water. When placed in a microwave oven and heated for 5.5 minutes, the generated steam is gradually discharged from the exhaust path, the bag does not break, the steaming effect is good at an appropriate internal pressure, and the entire temperature is plump. Less heating was possible. Even when the contents were filled and sealed with frozen hamburger steak, shumai, Chinese bun, red rice, white rice, etc., it was possible to similarly heat well only by adjusting the heating time.

In addition, frozen raw fish (bonito) is served with sauce
g, similarly, when heated in a microwave oven for 7 minutes, steam is discharged from the exhaust path at an appropriate internal pressure, the bag does not break, and the sauce does not spill out. It was as tasty as when it was stewed. Also, when the contents are taken out of the bag after cooking, the bag can be easily opened along the cut line 8b by the notch 7b, and the bag can be safely taken out without dripping from the exhaust path. did it.

[0058]

As is apparent from the above description, according to the present invention, foods to be eaten by heating or cooking in a microwave oven can be safely sealed, packaged, distributed, and filled. When using the contents, the simple operation of cutting off and opening the seal at the end of the exhaust path provided at the edge of the bag, using a heating means such as a microwave oven using the bag, Thawing, heating, or cooking the contents can be performed well in a short time while applying an appropriate internal pressure due to generated steam, etc. Furthermore, when taking out the contents, spilling liquids such as sauces In addition, there is an effect that a food bag excellent in usability, which can be safely and easily taken out, can be provided with high productivity.

[Brief description of the drawings]

FIG. 1 is a front view showing the configuration of a first embodiment of a food bag according to the present invention.

FIG. 2 is a front view showing a configuration of a food bag according to a second embodiment of the present invention.

FIG. 3 is a front view showing a configuration of a food bag according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wall film (laminated film) 2 Bottom 3 Bottom seal part 4 Bottom film cutout part 5 Side seal part 6 Exhaust passage forming seal part 7a, 7b Notch 8a, 8b Cutout line 9 Exhaust path 10 Top seal part 100, 200, 300 Food Bag

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E064 AB25 BA21 BA24 BA26 BA30 BB03 BC20 EA30 HD03 HE02 HE03 HP01 HP02 4B055 AA10 AA29 BA07 BA53 CA69 CA73 CB07 CB08 CC28 CC43 CC52 FA01 FB35

Claims (5)

[Claims] 1. A bag for hermetically packaging a food containing water, wherein the bag is formed in a standing pouch format and housed inside at one of the upper, lower, left and right edges of the bag. A food bag having a bent exhaust path for adjusting the internal pressure of the rising bag to a certain range when the food is heated together with the bag. 2. The food bag according to claim 1, wherein said low-density polyethylene is a linear low-density polyethylene, and ethylene / α polymerized using a single-site catalyst.
The food bag according to claim 1, wherein the bag is formed of a laminated film having any one of an olefin copolymer and a polypropylene as an innermost layer (sealant layer). 3. The food bag according to claim 1, wherein the innermost surface of the food bag is formed in a shape having fine irregularities. 4. A cut line for cutting and opening a sealed portion at an outer end of an exhaust passage before heating the contents, and a take-out opening for taking out the heated contents. The food bag according to any one of claims 1 to 3, wherein a cut line is provided, and the cut line is provided with an easy-opening means. 5. A method according to claim 4, wherein the cutout line of the content take-out port is provided at an edge adjacent to the edge provided with the exhaust path or inside the exhaust path. Food bag as described.