JP2000327047A - Bag for food - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide bags with a superior production for sealingly packaging food containing moisture in which food can be heated or prepared while applying a proper inner pressure safely in a microwave oven or the like under utilization of the bag when the content is used. SOLUTION: A bag 100 for food is formed in a pillow pouch form by using a laminar film 1. A rear seal section, for example, is heat sealed in an exhaust path-forming seal section 5, and exhaust paths 8, 8 of curved structure having the tip ends sealed. Out of the upper and lower openings, upper one is heat sealed with the upper seal section 3, and at the same time a cutting line 7a is arranged at a seal opening position of the exhaust path, a notch 6a is arranged at an end part thereof, a cutting line 7b at a content taking-out port is arranged at an end edge of one side of the bag, and a notch 6b is arranged at the end part thereof.

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 according to claim 1 is a bag for hermetically sealing and packaging a food containing water, wherein the bag forms a cylindrical body by heat sealing a back seal portion in a joint seal manner. It is formed in a pillow pouch format formed by heat sealing the openings at both ends of the body,
In addition, when the food stored in the bag is heated together with the bag inside the back seal portion or one of the upper, lower, left and right edges of the bag, the exhaust passage having a bent structure for adjusting the internal pressure of the rising bag to a certain range. And a food bag.

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 so that the exhaust path communicates with the outside.

By adopting such a configuration, since the shape of the bag is a pillow pouch type, the bag is easily formed and the productivity is excellent. Further, when using the contents sealed and packaged in a bag, the exhaust path communicates with the outside and the internal pressure can be adjusted during heating by simply cutting off the heat seal portion at the outer end of the exhaust path. . Therefore, by heating the contents in a bag with a microwave oven or the like while applying the appropriate internal pressure, the entire contents can be thawed, heated, or cooked without unevenness in a short time.

In particular, when the exhaust path is provided at the position of the back seal portion of the bag, when heating with a microwave oven or the like, the contents can be heated by placing the exhaust path so as to be located above the contents. Even a food containing a large amount of liquid material can be heated or cooked more safely without spilling over.

[0011] In the invention described in claim 2, the food bag is 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 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.

According to a third aspect of the present invention, the food bag according to the first or second aspect is characterized in that 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-described structure, in addition to the effects of the invention described in claim 1 or 2, the opening property of the bag itself is improved, and the filling seal for filling the contents is provided. The machine suitability and productivity of the machine can be improved, and air remains due to the unevenness in the bag exhaust path, so that the inner surfaces do not adhere to each other, and the steam generated by heating can be easily generated at the internal pressure. In order to smoothly enter the exhaust passage and open the exhaust passage smoothly, the function of adjusting the internal pressure works reliably, and heating and cooking can be performed well.

According to a fourth aspect of the present invention, a cutout line for a content take-out port is provided at one end of the food bag, and any one of the cutout line and the opening position of the exhaust path is provided. The food bag according to any one of claims 1 to 3, wherein an easy-opening means is provided on one or both of them.

[0018] The food bag of the present invention, when heating the contents,
First, in order to operate 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, it is preferable that the opening position of the exhaust path and the contents take-out opening, that is, the cutout line is displayed by printing or the like, and that these opening positions are provided with easy-opening means. . 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 operation and effect of the invention described in any one of the first to third aspects, 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.

[0021]

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. There is no particular limitation, and any known 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. Material can be freely selected and used. However, regarding the sealant layer, it is preferable to use any of linear low-density polyethylene, an ethylene / α-olefin copolymer polymerized using a single-site catalyst, and polypropylene from the above-mentioned point. As a representative example of the configuration 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, L·LDPE is a linear low density polyethylene, and 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.

And 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. A food bag can be provided.

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 the 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 pillow pouch-type bag that hermetically seals and packs food containing water, and the position of the back seal portion of the bag, or one of the upper, lower, left, and right edges. In the part, when the food stored in the bag is heated 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, fine irregularities for preventing adhesion between the inner surfaces, specifically, a height of 0.5 to 1
A structure having unevenness of 5 μm, and a cutout line of a content take-out port provided at any end of the bag, and a notch or a half cut at the cutout line and / or at the opening position of the exhaust passage. It includes a configuration provided with an easy-opening means such as a wire.

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

In the method of providing the fine irregularities on the innermost surface of the bag, the bag may be formed by using an embossing means, and when the sealant layer of the laminated film is laminated by the extrusion coating method, it may be formed on the surface. By laminating using a chill roll provided with fine irregularities, the mold can be easily formed. As still another method, irregularities can be formed by adding particles such as silica to the resin of the sealant layer.

[0032]

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 4 are perspective views each showing the configuration of an embodiment of the food bag of the present invention.

FIG. 1 is a perspective view showing the configuration of a first embodiment of the food bag of the present invention, and is a perspective view of the food bag as viewed from the side of an exhaust passage provided in a back seal portion. That is, the food bag 100 shown in FIG. 1 is configured such that the exhaust passages 8 having a bent structure for adjusting the internal pressure are provided by heat sealing in the back seal portion of the pillow pouch type bag. The width of the back seal portion for providing the paths 8, 8 is provided larger than usual.

In this food bag 100, both sides of the laminated film 1 in which the sealant layer is laminated on the innermost layer are folded back to the sealant layer side, and the tip ends of the folded laminated films are opposed to each other. Then, the portions are heat-sealed with a seal pattern capable of forming the exhaust passages 8 as shown in the drawing, that is, the exhaust passage forming seal portion 5, and then one opening, the upper opening in the drawing. Is heat-sealed by the upper seal portion 3 to form a bag whose lower portion is opened. The lower opening is filled with the contents from this part and then heat-sealed by the lower seal part 4 to be sealed.

The exhaust passage forming seal portion 5 includes a heat seal portion forming the inner exhaust passages 8, and a heat seal portion sealing the distal ends of the outer exhaust passages 8, 8. A cut line 7a for cutting the outer heat seal portion and opening the exhaust passages 8 when heating the contents and a notch 6a at the end thereof are provided at the outer edge of the seal portion 5 for forming the exhaust passage. Is provided.

Also, a cut-out opening for taking out the heated contents is provided at an edge of one side of the food bag 100, that is, at the right end in the figure. It has a line 7b and a notch 6b at its end. The cutout line 7b and the notch 6b provided at the end may be provided at the edge of the left side of the bag 100.

The cut-out lines 7a and 7b 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 6a and 6b.
It can be provided in combination with b. This applies to the food bags 200, 300, and 400 shown in FIGS. Although not shown in the figure, the innermost surface of the food bag 100, that is, the surface of the sealant layer of the laminated film 1 can be formed in the shape having the fine irregularities. This also applies to the food bags 200, 300, and 400 shown in FIGS.

By adopting such a configuration, the food bag 100 is a pillow pouch-type bag, so that bag making is easy and excellent in productivity, and fine irregularities are provided on the innermost surface of the bag. Therefore, the bag has good openability and excellent filling suitability of 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 path can be easily cut along the cut line 7a by using the notch 6a. And the internal pressure adjusting function becomes operable.

Accordingly, the bag 100 in this state is placed in a microwave oven or the like as it is, with the portion provided with the exhaust path facing upward, and the contents are heated. When the internal pressure gradually increases and reaches a certain internal pressure, the exhaust passages 8 and 8 are opened, and the 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 8 and 8, the inner surfaces do not adhere to each other, and the exhaust passages are smoothly opened as the internal pressure increases.

The width of each of the exhaust passages 8 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.

Further, when taking out the contents after heating or cooking, the side edge of the bag 100 is easily cut along the cutting line 7b by using the notch 6b provided in this portion. Can be opened by opening the exhaust passages 8, 8
Can be safely taken out without spilling even if the contents contain liquid material.

FIG. 2 is a perspective view showing the configuration of a food bag according to a second embodiment of the present invention, and is a perspective view of the food bag as viewed from the side opposite to the back seal portion. Food bag 20 shown in FIG.
In the configuration of the food bag 100 shown in FIG. 1, the position of the exhaust passage forming seal portion 5 forming the exhaust passages 8 is changed from the position of the back seal portion to the upper edge of the food bag. And the opening position of the bag itself, that is, the opening position at the time of taking out the contents after heating, the side edge portion of the food bag 200, the left edge portion in the figure, and there A cut line 7b is provided, and a notch 6b is provided by changing to a lower end thereof. In this case, the cut line 7b for opening the bag 200 and the notch 6b at the end thereof may be provided at the edge of the other side of the bag 200, that is, at the right edge in the drawing. Further, it may be provided at a position below the exhaust passage forming seal portion 5 provided at the upper part of the bag.

In the food bag 200, both sides of the laminated film 1 in which the sealant layer is laminated on the innermost layer are folded back to the sealant layer side similarly to the food bag 100 shown in FIG. The top ends of the laminated films on both sides are overlapped so that the sealant layers thereof are opposed to each other, and heat-sealed in the vertical direction (length direction of the bag) with the back seal portion 2 to form a tubular body having upper and lower sides open. None, and then one opening, the upper opening in the figure, is heat-sealed with the exhaust path forming seal portion 5 of the illustrated shape, and the top end of the bag 200 is sealed with the heat seal portion. Exhaust passages 8, 8 having a bent structure are formed, and the bag is opened at the lower part.

Also in this case, the lower opening is filled with the contents from this portion, and then heat-sealed by the lower seal portion 4 to be sealed. The configuration of the exhaust passage forming seal portion 5 is the same as that of the exhaust passage forming seal portion 5 provided in the food bag 100 shown in FIG. Cut line 7a for opening the exhaust passages 8, 8 and a notch 6a provided at the end thereof.
Are also provided similarly.

When such a configuration is adopted, the exhaust path 8,
8 is provided at the upper edge of the bag 200,
When heating the contents filled in the bag when the bag 200 is laid down and the bag 200 is laid down, the exhaust passages 8 and 8 are in the horizontal position. The function of adjusting the internal pressure is as shown in FIG. The same effect as that of the bag 100 can be obtained, and the operation and effect of the bag 200 as a whole can be substantially the same as those of the food bag 100 shown in FIG.

Next, FIG. 3 is a perspective view showing the configuration of a third embodiment of the food bag according to the present invention. As in FIG. 2, the food bag is viewed from the opposite side of the back seal portion. It is a perspective view. The food bag 300 shown in FIG. 3 is different from the food bag 200 shown in FIG. 2 in that the exhaust path forming seal portion 5, which forms the exhaust paths 8 provided at the upper edge of the bag, And the cutout line 7a and the notch 6a are provided on the side edge of the bag 300, that is, on the right side edge in the drawing, and provided at the cutout line 7b of the content take-out opening and the end thereof. The notch 6b is replaced with the exhaust passage forming seal portion 5.
(The main body side of the bag 300). In this case, the exhaust path forming seal portion 5, the cutout line 7a and the notch 6a thereof, and the cutout line 7b and the notch 6b of the content take-out opening provided inside the seal portion 5 may be provided at the left edge of the bag 300. .

Even when such a configuration is adopted, the position of the exhaust path provided in the food bag 300 and the positions of the cut lines and notches are changed only around the bag, and the food bag shown in FIG. The same operation and effect as those of the embodiment 200 can be obtained.

FIG. 4 shows a fourth example of the food bag of the present invention.
FIG. 2 is a perspective view showing a configuration of the embodiment of the present invention, and is a perspective view of a food bag as viewed from a back seal portion side. Food bag 4 shown in FIG.
In the configuration of the food bag 200 shown in FIG. 2, only the seal pattern of the exhaust passage forming seal portion 5 provided on the upper edge portion of the bag is applied to one of the right and left sides of the back seal portion 2. In the figure, the exhaust passages 8 are formed at the right upper edge of the back seal portion 2 by changing the seal pattern into a shape in which the exhaust passages 8 are formed.

When such a configuration is adopted, the back seal portion 2
Is usually provided at the center in the width direction of the bag 400,
It is also easy to dispose it on one of the right and left sides, and if the space for forming the exhaust passages 8 is insufficient, the position of the back seal portion 2 is set to the opposite side to the side on which the exhaust passages 8 are provided. It can be easily adjusted by being formed close to. Therefore, by adopting such a configuration, the same operation and effect as those of the food bag 200 shown in FIG. 2 can be obtained.

(Test Example 1) As a food bag of the present invention, a food bag having the structure shown in FIG. 1 was prepared, and a laminated film having the following structure was prepared. Using a 12 μm thick PET film for the outermost substrate film, using a 15 μm thick ON film for the intermediate layer, and using a 50 μm thick LLDPE film for the innermost sealant layer, After performing four-color pattern printing (including cutting line printing) on the inner surface (laminated surface) of the PET film by gravure printing, each film is bonded by a dry lamination method using a polyurethane-based two-component curable adhesive. In addition, on the entire surface of the L / LDPE film of the innermost layer, by heat embossing, the bottom is a square with a side of 0.8 mm, and the protruding part with a height of 10 μm is arranged around the convex part with an interval of 0.7 mm. The concave and convex portions were molded to prepare a laminated film.

Using the above-described laminated film, the dimensions of each part were set as follows by a bag making machine in which the heat sealing device for the back seal portion of the pillow pouch bag making machine was modified, as shown in FIG.
Was prepared. The outer dimensions of the bag are
The width is 170 mm, the length is 260 mm, the width of the back seal portion is 40 mm, the length is 260 mm, and the exhaust path of the illustrated shape is formed by aligning the cutout line with the cut line by heat sealing at that portion, After the upper opening is heat-sealed with the upper seal part 3 and the individual bags are cut off, notches 6a and 6b are provided at predetermined positions by a separately prepared punching device, and the notches 6a and 6b shown in FIG. A bag was made. The width of the exhaust passages 8 is 8 m at the minimum.
m width.

After the food bag prepared as described above is filled and sealed with frozen omurice as the content, the heat seal portion at the end of the exhaust path is cut off along the cut line 7a and opened, and the bag is opened at 500 W. 4. Put in microwave oven
After heating for 5 minutes, the generated steam was gradually discharged from the exhaust path, the bag was not broken, the steaming effect was good at an appropriate internal pressure, and the entire body could be heated with little temperature unevenness. 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.

[0053] Also, frozen raw fish (bonito) is served with sauce for 300 minutes.
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 delicious as boiled. Also, when the contents are taken out of the bag after cooking, the bag can be easily opened along the cut line 7b by the notch 6b, and the bag can be safely taken out without dripping from the exhaust path. did it.

[0054]

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 perspective view showing the configuration of a first embodiment of a food bag according to the present invention.

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

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

FIG. 4 is a perspective view showing a configuration of a food bag according to a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laminated film 2 Back seal part 3 Upper seal part 4 Lower seal part 5 Exhaust path formation seal part 6a, 6b Notch 7a, 7b Cut-out line 8 Exhaust path 100, 200, 300, 400 Food bag

Continued on front page F term (reference) 3E064 AA04 AA08 AA09 BA27 BA30 BB03 BC18 BC20 EA30 HD03 HE10 HN06 HP01 HP02 HP03 3E067 AA30 AB01 BA12A BB15A BB16A BC04A CA24 EA07 EA08 EB02 EB07 EB08 EE48

Claims (4)

[Claims] 1. A bag for hermetically packaging a food containing water, said bag being heat-sealed with a back seal portion in the form of a joint seal to form a cylindrical body, and openings at both ends of said cylindrical body. Is formed into a pillow pouch form, which is formed by heat sealing
In addition, when the food stored in the bag is heated together with the bag inside the back seal portion or one of the upper, lower, left and right edges of the bag, the exhaust passage having a bent structure for adjusting the internal pressure of the rising bag to a certain range. A food bag characterized by being provided with. 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 cutout line of a contents take-out port is provided at any end of the food bag, and one or both of the cutout line and the opening position of the exhaust path are easily opened. The food bag according to any one of claims 1 to 3, further comprising a sex means.