JP2000335656A - 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 gusset pouch by using a laminated film 1, and the width of its back sealing part is made, for instance, larger by a necessary dimension, and exhaust passages 7 and 7 each in a zigzagged structure with its one end sealed up with a heat sealed part are provided with heat sealing applied to the part where the width is made large with a seal pattern of an exhaust passage forming seal part 6, and while one (at the lower part) out of two openings at the upper and lower parts is heat sealed with a lower seal part 4, an incision 8a is provided at an unsealing position of the exhaust passage with a notch 9a provided at its end. The incision 8b for forming a port for taking out contents is provided, with the notch 9b formed at its end, at the external edge of a front gore of a gusseted part 2 at one side (left side) of the bag.

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 hermetically sealing and packaging a food containing water, wherein the bag is provided with gusset portions on both sides to form a tubular body, and both side openings of the tubular body are provided. Is formed in the form of a gusset pouch that seals the edge of the bag by heat sealing, and at least one of the back seal portion of the bag, the gusset portion, and the edge portion of the opening on both sides, is internally provided. When the stored food is heated together with the bag, the food bag is characterized in that a bent exhaust path for adjusting the internal pressure of the rising bag to a certain range is provided by heat sealing.

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 gusset pouch type, bag making is easy and good in productivity, and the contents can be hermetically sealed and packaged for its capacity. . Then, 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 addition, since the bag has a thickness due to the gusset portion, when the contents are heated by a microwave oven or the like, even if the bags are laid down, the exhaust path can be higher than the bottom surface. Even if the product is a food containing a large amount of liquid material, it can be safely heated or cooked in a stable state 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 configuration, in addition to the function and effect of the invention described in claim 1 or 2, the laminated film is provided with an appropriate slipperiness, and the suitability for bag making is improved. The openability of the bag itself is improved, and the machine suitability and productivity of the filling and sealing machine when filling the contents are improved.Also, air remains in the exhaust path of the bag due to unevenness on the inner surface of the bag. The steam generated by the heating does not stick to each other, and the steam generated by the heating easily enters the exhaust passage at its internal pressure, and the exhaust passage is smoothly opened. be able to.

The height of the fine irregularities is 0.5 μm
If the ratio is less than the above range, the effect of retaining air is reduced, and the inner surfaces of the laminated film are likely to adhere to each other, which is not preferable. If the height of the irregularities exceeds 15 μm, the effect of preventing the inner surfaces of the laminated film from adhering to each other is good, but the heat sealing suitability is undesirably reduced.

The invention according to claim 4 is characterized in that a cut line is provided at one or both of the opening position of the exhaust passage of the food bag and the opening position of the contents take-out opening. A food bag according to any one of claims 1 to 3. The cut line can be easily provided by printing or the like, and is preferably provided at least at the opening position of the exhaust path, and more preferably at both the opening position of the exhaust path and the opening position of the content take-out port.

[0019] The food bag of the present invention, when heating the contents,
First, in order to operate the function of adjusting the internal pressure of the exhaust path, the opening position of the exhaust path, that is, the heat seal portion at the outer end of the exhaust path is cut and opened, and then the contents are applied while applying a predetermined internal pressure using a microwave oven or the like. It heats or cooks the material, and then cuts off the opening position of the content take-out opening and uses it in a method of opening. If the opening order and opening position are used incorrectly, the function of adjusting the internal pressure of the exhaust path will not work, and if the contents contain a large amount of liquid, the liquid may spill out.

Therefore, 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 cutout line becomes clear, thereby preventing erroneous use. As a result, the contents can be heated or cooked and taken out as intended.

[0021] The invention described in claim 5 is characterized in that an easy-opening means is provided at one or both of an opening position of an exhaust path of the food bag and an opening position of a content take-out opening. A food bag according to any one of claims 1 to 4.

Examples of the easy-opening means include notches commonly used in ordinary bags, half-cut lines by laser light irradiation or the like, or lamination of a uniaxially stretched film (the stretching direction matches the direction of the cut line). There is a cut tape sticking, etc., and these may be used alone, or as a notch and a half cut line, or a uniaxially stretched film stack, or a cut tape sticking, etc. A plurality of them can be used in combination.

By adopting such a configuration, in addition to the functions and effects of the invention according to any one of claims 1 to 4, the opening position of the exhaust path of the food bag and the opening position of the contents take-out opening are provided. Can be easily torn open by hand at an appropriate position.

[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 heating suitability by a microwave oven, a metal layer such as an aluminum foil or an aluminum vapor-deposited layer is laminated. There is no particular limitation, and any known laminated film used for packaging bags for foods containing water and other liquid components can be used, such as the type of contents to be packaged and the use conditions after filling. Material can be freely selected and used according to the conditions.

Typical examples of the laminated film that can be preferably used include the following constitutions. (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 pasting 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. 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 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 gusset pouch-type bag for hermetically sealing and packaging food containing water, and the back seal portion of the bag, the gusset portion, and the edges of the opening portions on both sides. At least one of these, when the food stored inside is heated together with the bag, the exhaust path of the bent structure for adjusting the internal pressure of the rising bag to a certain range is basically provided by heat sealing. And, as the shape of the bag, further, on the innermost surface of the bag, a configuration in which fine irregularities for preventing adhesion between the inner surfaces, specifically irregularities with a height of 0.5 to 15 μm, Opening position of the exhaust path of
Alternatively, a configuration in which an easy-opening means such as a cutout line, a notch, or a half-cut line is provided at the opening position of the content take-out port is included.

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

In the method of forming the fine unevenness on the innermost surface of the bag, the bag may be formed by using an embossing means. 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.

[0035]

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 according to the present invention, and is a perspective view of the food bag viewed from the side of an exhaust passage provided in a back seal portion thereof. That is, FIG.
The food bag 100 shown in FIG. 1 is configured such that the exhaust passages 7 having a bent structure for adjusting the internal pressure are provided by heat sealing at the position of the back seal portion of the gusset pouch type bag. , 7, the width of the back seal portion 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 to form gusset portions 2 and 2 on both sides. The tip of the laminated film
The sealant layers are overlapped so as to face each other, and the portion is heat-sealed with a seal pattern capable of forming the exhaust passages 7 as shown in FIG. , One of the openings, the lower opening in the figure, is heat-sealed with the lower seal portion 4,
The bag has an open top. The upper opening serves as a filling port for the contents, and after filling the contents from this portion, the upper sealing portion 5 heat seals to seal the contents.

The exhaust passage forming seal portion 6 includes a heat seal portion forming the inner exhaust passages 7, and a heat seal portion sealing the distal ends of the outer exhaust passages 7, 7. A cut line 8a for cutting the outer heat seal portion to open the exhaust passages 7 when heating the contents, and a notch 9a at the end thereof are provided at the outer edge of the exhaust passage forming seal portion 6. Are provided.

The outer edge of the front fold of the gusset 2 on one side (left side in the figure) of the food bag 100 has:
A cutout line 8b of the contents take-out port indicating an unsealing position when taking out the contents after heating is provided, and a notch 9b is provided at an end thereof. This cut line 8b,
The notch 9b provided at the end may be provided at the outer edge of the front pleat of the gusset 2 on the right side of the bag 100.

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 a cut tape.
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 gusset pouch-type bag and has a large thickness, so that the contents can be compactly hermetically sealed and distributed safely. When the contents sealed in the bag are used, the heat seal portion at the outer end of the exhaust path 7, 7 can be easily cut along the cut line 8a by using the notch 9a. As a result, the exhaust paths 7, 7
It communicates with the outside and becomes ready for internal pressure adjustment during heating.

Accordingly, the bag 100 in this state is laid down such that the exhaust passages 7 and 7 are directed upward, and is placed in a microwave oven or the like to heat the contents. As a result, the internal pressure of the bag gradually increases, and when the internal pressure reaches a certain internal pressure, the exhaust paths 7, 7 are opened, and steam is discharged to the outside through the path indicated by the arrow. At this time, since the fine irregularities are provided on the innermost surfaces of the exhaust passages 7, 7, the inner surfaces do not adhere to each other, and the exhaust passages 7, 7 are smoothly opened as the internal pressure increases. You.

The width of the exhaust passages 7 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 the contents after heating or cooking are taken out, the outer edge of the pleats on the front side (closer to the exhaust passages 7, 7) of the gusset portion 2 of the bag 100 is attached to this portion. The notch 9b provided can be easily cut and opened along the cutting line 8b by using the notch 9b.
7 can be safely taken out without being spilled even if the contents include a liquid material without being located on the lower side.

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, reference numeral 0 denotes an exhaust passage forming seal portion 6 provided at a position of a back seal portion.
And the cutout line 8a and the notch 9a are provided on the outer edge of the fold of the front side (opposite to the back seal 3) of the gusset 2 on one side (right side in the figure) of the food bag 200. At the same time, the position of the cutout line 8b of the contents take-out opening for taking out the contents after heating and the position of the notch 9b provided at the end thereof are changed and provided near the inside of the exhaust passage forming seal portion 6. It was done.

In the case where such a configuration is employed, the above-described FIG.
The same operational effects as those of the food bag 100 having the configuration shown in FIG. That is, the contents can be easily filled and hermetically sealed from the opening at the top of the food bag 200. At this time, the cross-sectional shape of the bag 200 in the lateral direction is one (right side in the figure) of the gusset portion. Since the exhaust path forming seal portion 6 is provided in the front fold portion of 2, the contents can be changed in a slight way, but the contents can be sealed and packaged compactly and safely distributed. Also, when using the contents sealed and packaged, the heat seal portion at the outer end of the exhaust passages 7, 7 can be easily cut out along the cutout line 8a by using the notch 9a. Then, the exhaust paths 7, 7 communicate with the outside, and the internal pressure during heating can be adjusted.

The bag 200 in this state is transferred to the exhaust passages 7, 7.
When the internal pressure of the bag 200 is increased by steam generated from the contents and reaches a certain internal pressure by heating the contents by placing the contents in a microwave oven or the like so that the exhaust paths 7, 7 are exhausted. The steam is discharged to the outside through the path indicated by the arrow as in the food bag 100 shown in FIG.
The inside of 00 is kept 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. When the contents after heating or cooking are taken out, the portion of the exhaust path forming seal portion 6 of the bag 200 is easily cut along the cut line 8b by using a notch 9b provided near the inside thereof. The contents can be safely taken out without the contents being spilled due to the exhaust paths 7 and 7 being lowered.

FIG. 3 is a perspective view showing the configuration of a third embodiment of the food bag according to the present invention. Food bag 30 shown in FIG.
Reference numeral 0 denotes an exhaust path forming seal portion 6 at an outer edge of a front fold of the gusset portion 2 on one side (right side in the figure) of the gusset pouch-type bag 300, and a cutting line 8a and an end at the opening position. Notch 9a, and a cutout line 8b for the content take-out opening and a notch 9b at the end thereof are provided near the inside of the exhaust passage forming seal portion 6 (on the main body side of the bag 300). And in this regard,
It has the same configuration as the food bag 200 shown in FIG.

However, the difference between the two is that, in the food bag 200 shown in FIG. While the cylindrical body is manufactured by heat sealing in the vertical direction with the end portions aligned with each other, the food bag 3 shown in FIG.
In 00, the position of the back seal portion is moved to one end, and the end of the laminated film at the folded portion and the end of the laminated film at the wall portion are inserted into the bag 3 without providing a seal margin for the back seal portion.
The cylindrical body is manufactured by heat-sealing with the end portion of the side portion of No. 00 and sealing the end edge thereof with the seal pattern of the exhaust passage forming seal portion 6.

Therefore, by adopting such a configuration, there is an advantage that the width of the laminated film can be reduced because the back seal portion is removed, and in terms of the function as a food bag of the present invention, both are reduced. There is no difference between them, and the same function and effect as the food bag 200 shown in FIG. 2 can be obtained.

FIG. 4 is a perspective view showing the configuration of a fourth embodiment of the food bag according to the present invention. Food bag 40 shown in FIG.
In the configuration of the food bag 200 shown in FIG. 2, reference numeral 0 denotes an exhaust passage forming seal portion 6 provided at the outer edge of the front fold of the gusset portion 2 on the right side of the bag, and cutting of the opening position thereof. Line 8a and notch 9a at its end are connected to bag 40
0, and the position of the cutout line 8b of the outlet for taking out the contents and the notch 9b at the end thereof is positioned outside the front fold of the gusset 2 on the left side of the bag 400. It is configured by changing and providing at the edge.

In this case, the position of the cutout line 8a at the opening position of the exhaust passage forming seal portion 6 and the notch 9a at the end thereof may be the upper edge of the bag 400, or the position of the contents. The position of the cutout line 8b of the outlet and the notch 9b at the end thereof may be the outer edge of any of the front and rear folds of the left and right gusset portions 2 of the bag 400.

By adopting the above-described configuration, the contents can be easily filled from the upper opening, and the opening can be heat-sealed with the upper seal portion 5 and hermetically sealed. . When using the contents sealed and packaged, first, the heat seal portions at the outer end portions of the exhaust passages 7 of the exhaust passage forming seal portion 6 are cut along the cut line 8a using the notch 9a. By cutting out,
The exhaust paths 7, 7 communicate with the outside, and the internal pressure can be adjusted by the exhaust paths 7, 7.

Therefore, the bag 400 in this state is, for example,
When the inner pressure of the bag 400 is increased by steam generated from the contents and reaches a certain internal pressure by heating the back 400 with the back seal part 3 placed in a microwave oven or the like, the exhaust passages 7 and 7 are opened. Similar to the food bag 200 shown in FIG. 2, steam is discharged to the outside along the path shown by the arrow, and the inside of the bag 400 is maintained at a constant pressure. At this time, since the bag 400 has a thickness due to the gusset portions 2 and 2, the exhaust passages 7 and 7 are located at a position higher than the bottom surface. Instead, it can be heated while applying an appropriate internal pressure. Therefore, heating or cooking suitable for the contents can be performed in a short time with less temperature unevenness.

When removing the contents after heating or cooking, the cutout line 8b is formed by using a notch 9b provided at the outer edge of the front fold of the gusset 2 on the left side of the bag 400. Can be easily cut off and opened, so that the contents can be safely taken out without the contents being spilled due to the exhaust path 7, 7 being on the lower side.

(Test Example 1) As a food bag of the present invention, a food bag having the configuration shown in FIG. 1 was prepared, and a laminated film thereof was prepared with the following configuration. 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 laminated film, the dimensions of each part were set as follows by a bag making machine in which the heat sealing device of the back seal portion of the gusset pouch bag making machine was modified as shown in FIG. Was prepared. The outer dimensions of the bag are 120 mm in width and 250 mm in length, the gussets on both sides have a folding depth of 25 mm, and the width of the back seal is 40 mm. The seal pattern of the seal portion 6 is heat-sealed by aligning it with the cut line, and the lower opening portion is heat-sealed by the lower seal portion 4 to separate individual bags, and then punched separately at predetermined positions. Notches 9a and 9b were provided by the apparatus to produce a food bag having the configuration shown in FIG. The width of the exhaust passages 7 is 8 at the minimum.
mm 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 along the cut line 8a using the notch 9a and opened. Then, when the bag was put into a 500 W microwave oven and heated for 5.5 minutes, the generated steam was gradually discharged from the exhaust path, the bag was not broken, and the steaming effect was good at an appropriate internal pressure. The heating was able to be carried out with a small amount of uneven temperature. As contents
Even when a frozen hamburger, Shumai, Chinese steamed bun, red rice, white rice, etc. were filled and sealed, it was possible to similarly heat well only by adjusting the heating time.

[0060] 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. In addition, when the contents are taken out of the bag after cooking, the bag can be easily opened along the cut-off line 8b by the notch 9b, and at this time, the dripping does not spill out from the exhaust path, and the bag can be safely opened. I was able to take it out.

[0061]

As described above in detail, according to the present invention, food to be eaten by heating or cooking in a microwave oven or the like can be safely sealed, packaged, distributed, and filled. When using the contents, the back seal of the bag,
With a simple operation of cutting and opening the heat seal part at the end of the exhaust path provided at either end of the gusset part or the opening on both sides, use the bag to open the microwave oven etc. Thawing and heating the contents by heating means,
Alternatively, cooking can be performed satisfactorily in a short time while applying an appropriate internal pressure due to generated steam or the like, and furthermore, when taking out the contents, safely and easily taking out a liquid material such as a sauce without spilling. That is, there is an effect that a food bag excellent in usability 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 Gusset part 3 Back seal part 4 Lower seal part 5 Upper seal part 6 Exhaust path formation seal part 7 Exhaust path 8a, 8b Cutout line 9a, 9b Notch 100, 200, 300, 400 Food bag

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E064 AA13 BA24 BA26 BA30 BB03 BC18 BC20 EA30 HD03 HP01 HP02 4B055 AA10 AA29 BA07 BA53 CA01 CA69 CA73 CC28 CC43 CC52

Claims (5)

[Claims] 1. A bag for sealingly packaging food containing water, said bag having a gusset portion on both sides to form a tubular body, and heat-sealing the edges of both side openings of said tubular body. The bag is formed in the form of a gusset pouch which is sealed by a seal, and the food stored therein is contained in at least one of the back seal portion, the gusset portion, and the edge portions of both side openings of the bag. A food bag, characterized in that a bent exhaust path for adjusting the internal pressure of the rising bag to a certain range when heated together is provided by heat sealing. 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 cutting line is provided at one or both of an opening position of an exhaust passage of the food bag and an opening position of a content take-out opening. A food bag according to any of the claims. 5. An easy-opening means is provided at one or both of an opening position of an exhaust passage of the food bag and an opening position of a contents take-out opening.
A food bag according to any one of claims 1 to 4.