JP2000344279A - Bag for foodstuff - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag for packaging moisture-containing foodstuffs in a sealed state, whose contents can be heated or cooked by a microwave oven or the like under an appropriate internal pressure applied to the contents by utilizing the bag as it is when the contents are used, and which is reusable even after use. SOLUTION: A bag 100 for foodstuffs is formed into, for example, a four-side seal shape and has such a structure that air discharge passages 8, 8 having a folded configuration for adjusting the internal pressure are provided by heat seal at any of edges on the circumference of the bag 100 and further that a freely openable zipper-type fastner 10 is provided inside an edge different from the edge where the air discharge passages are provided, together with an outer heat-sealed part positioned outwardly of the zipper-type fastner. In addition, it is preferable that a perforated line 7a and a notch 6a are provided at an unsealing position at the joining top end of both the air discharge passages and that a perforated line 7b and a notch 6b are provided between the zipper- type fastner 10 and the outer heat-sealed part.

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 perform heating, cooking, or the like satisfactorily while applying an appropriate internal pressure, and can reuse a used bag.

[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. Furthermore,
These food bags, when taking out the contents after heating, to open out any of the bags to take out the contents,
There is a problem that the bag after opening has no resealability and cannot be reused.

[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 while applying an appropriate internal pressure by a simple operation and safely by a heating means such as a microwave oven using the bag, Another object of the present invention is to provide a food bag excellent in usability, in which the used bag can be reused, with good 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 three-side seal type or a four-side seal type, and any one of up, down, left, and right of the bag. At the edge, when the food stored therein is heated together with the bag, an exhaust passage having a bent structure is provided for adjusting the internal pressure of the rising bag to a certain range, and further provided with the exhaust passage. On the edge different from the edge, along with the outer heat seal part,
A food bag is provided with a zipper-type fastener which can be opened and closed inside.

According to a second aspect of the present invention, there is provided a bag for hermetically sealing and packaging a food containing water, wherein the bag forms a tubular body by heat-sealing a back seal portion in a joint-sealing manner. A food product formed in a pillow pouch form formed by heat-sealing openings at both ends of the cylindrical body, and housed inside the back seal portion or any of the upper, lower, left and right edges of the bag. When the whole bag is heated, an exhaust path having a bent structure for adjusting the internal pressure of the rising bag to a certain range is provided, and further, the exhaust path is provided in the back seal portion or the upper, lower, left and right edge portions. The food bag is characterized in that a zipper-type fastener that can be opened and closed is provided inside an outer heat seal portion and an inner heat seal portion at an edge portion different from the provided edge portion.

[0008] In the present invention, when the steam generated from the contents by the heating is discharged to the outside through the exhaust path, a pressure loss occurs in the exhaust path having the bent structure, and an appropriate 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 outside end of the exhaust passage is sealed by heat sealing before the contents are heated, so that the contents can be safely sealed, packaged, distributed, and stored. When the contents are heated, the heat seal portion at the outer end of the exhaust path is cut off for the first time, and the exhaust path is used so as to communicate with the outside.

[0010] The zipper-type fastener comprises a tape body provided with a convex ridge that can be fitted to each other, and a tape body provided with a concave ridge, and the two are attached to the inner surface of the opening of the bag. Arrange so that the ridge and the concave are opposite,
The bag can be easily and repeatedly opened and closed by fitting and disengaging the ridges and recesses by heat bonding with the tape body.

[0011] Such a zipper type fastener,
It is to be attached to the edge portion serving as a takeout opening of the contents of the bag, so that the contents can be repeatedly taken in and out, but in the case of the food bag of the present invention, until the contents are used It is necessary that the contents can be securely sealed and packaged for distribution and storage. For this purpose, the outside of the zipper-type fastener attached to the edge of the bag is further heat-sealed and securely sealed. Then, when the content is heated and then taken out, it is preferable to cut off the outer heat seal portion and use a zipper type fastener.

By adopting such a configuration, since the shape of the bag is a three-sided seal type, a four-sided seal type, or a pillow pouch type, bag making is easy and excellent in productivity. 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, if the contents are heated in a microwave oven or the like while being stored in the bag, steam is generated from the contents, and heating can be performed while applying an appropriate internal pressure. can do.

In particular, when the bag is of a pillow pouch type and the exhaust passage is provided at the position of the back seal portion, when heating with a microwave oven or the like, the exhaust passage is placed such that the exhaust passage is located above the contents. Therefore, even if the content is a food containing a large amount of liquid material, it can be heated or cooked more safely without spilling over.

When the heated contents are taken out, the zipper-type fastener can be opened and closed by cutting off the heat-seal portion on the outside of the zipper-type fastener. Can be taken out. Further, the food bag of the present invention has an internal pressure adjusting function by the exhaust path even after use, and has a resealability by a zipper type fastener, so that the bag is washed,
It can be stored and reused.

The invention according to claim 3 is characterized in that the food bag is formed of a laminated film having any one of linear low-density polyethylene and polypropylene as an innermost layer (sealant layer). A food bag according to claim 1 or 2.

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 in the same manner as a normal food bag, but when the contents are heated, the film is filled in the bag. In order to heat, it is preferable that the sealant layer is excellent in heat resistance, content resistance, low odor, and heat resistance. In this regard, linear low-density polyethylene is
Heat sealability, excellent in content resistance, and relatively low odor, and polypropylene is particularly excellent in heat resistance, low odor, excellent in content resistance. Particularly suitable as a sealant layer for the laminated film used.

Therefore, by adopting such a configuration, in addition to the functions and effects of the first or second aspect of the present invention, the contents can be sealed and packaged more safely for distribution, and the contents can be made of resin. It is possible to safely thaw, heat, or cook even in food hygiene without transferring the odor and losing the flavor.

According to a fourth aspect of the present invention, the innermost surface of the food bag is formed in a shape having fine irregularities. Consists of bags. The fine irregularities are preferably, for example, irregularities having a height of about 0.5 to 15 μm, and 2 to 10 μm.
Is more preferable.

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. If the height of the fine irregularities is less than 0.5 μm, the effect of retaining air is reduced, and the inner surfaces of the laminated film tend 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.

Therefore, by adopting the above-described configuration, in addition to the effects of the invention described in any one of the first to third aspects, the laminated film is given an appropriate slipperiness, and the suitability for bag making is improved. Along with the improvement, the opening property of the bag itself is improved, the mechanical suitability and productivity of the filling and sealing machine when filling the contents are improved, and also in the exhaust path of the bag, air remains due to the unevenness of the bag. Because the inner surfaces do not adhere to each other, the steam generated by heating the contents easily enters the exhaust passage at its internal pressure and smoothly opens the exhaust passage, so that the internal pressure adjustment function works reliably.
The contents can be satisfactorily heated or cooked.

The invention according to claim 5, wherein at least the fitting portion of the zipper type fastener is formed of polypropylene or methylpentene polymer. Bag. The methylpentene polymer is a polymer of 4-methylpentene-1, but may be a copolymer with propylene or the like, or may be a blend resin with polypropylene.

By adopting such a structure, the polypropylene or methylpentene polymer has a moderate elasticity and excellent heat resistance. Therefore, when heating the contents, the zipper is heated by the heat and the internal pressure. The fastener of the type is securely locked without the fitting part coming off, and the internal pressure adjusting function of the exhaust path is maintained well. Therefore, when the food bag is reused, it can be used favorably.
The zipper-type fastener may be formed of a single resin such as the polypropylene or methylpentene polymer. For example, the back side of a tape body provided with a ridge or a ridge that can be fitted, that is, a bag Further, a resin layer for improving adhesiveness may be further provided on the lamination surface side to the inner surface by multi-layer coextrusion to form a multilayer structure.

According to a sixth aspect of the present invention, a perforated line is provided between the unsealing position of the exhaust passage and the zipper-type fastener and a heat seal portion outside the zipper-type fastener. The food bag according to any one of claims 1 to 5, further comprising an opening means.

[0024] The food bag of the present invention, when heating the contents,
First, in order to operate the internal pressure adjusting function of the exhaust path, the heat seal portion at the outer end of the exhaust path is cut off and opened, and then the content is heated or cooked while applying a predetermined internal pressure with steam using a microwave oven or the like. After that, in order to take out the contents, the outer heat-seal portion of the zipper-type fastener is cut off, the fastener is disengaged, and the fastener is opened.

Therefore, it is preferable that the cut position of the heat seal portion outside the exhaust path and the fastener be displayed as a cut line by printing or the like, and that these cut lines are provided with easy-opening means. preferable. As the above 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 the application of a cut tape, the lamination of a uniaxially stretched film (the stretching direction is a cut line) Laminated so as to match the direction), etc., and these may be used alone, or a combination of two or more such as laminating a notch and a half-cut line, or a cut tape, or laminating a uniaxially stretched film. 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 5, the position of the cutout line becomes clear, and erroneous use can be prevented, and a suitable position can be prevented. It can be easily torn open by hand.

[0027]

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. However, as for the innermost sealant layer of the laminated film, linear low-density polyethylene and polypropylene are particularly suitable from the above points.

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, 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.

In the construction of the above-mentioned laminated film, ON
Film, PET film, when used for the outermost layer,
When used as a base film to impart mechanical strength, heat resistance, and printability to a food bag and used as an intermediate layer, it is mainly used to reinforce 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. ,
Tearing can be facilitated and its directionality can be stabilized. 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 deposited 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 described above, as the sealant layer, particularly suitable L / LDPE film, CP
Examples of P-films have been given, but in addition to these, ordinary low-density polyethylene such as ethylene-α-olefin copolymer polymerized using a single-site catalyst such as a metallocene catalyst, high-pressure process polyethylene, and ethylene-vinyl acetate copolymer Copolymers, ethylene / acrylic acid copolymers, ethylene / acrylic acid ester copolymers, ionomers, polyester resins, and the like can also be appropriately selected and used according to use conditions.

In particular, the ethylene / α-olefin copolymer polymerized using a single-site catalyst has a narrow molecular weight distribution and a stable copolymerization ratio, and thus has a low-temperature heat-sealing property and a hot-sealing property. It is suitable for foods whose contents are susceptible to odors such as resin odor, because of its excellent low odor properties. Such a sealant layer is preferably laminated by a dry lamination method using a pre-formed film using an adhesive, as shown in the above configuration example, but may also be laminated by an extrusion lamination method or an extrusion coating method. it can.

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 three-sided or four-sided sealed type bag that seals and packs food containing moisture, or a pillow pouch-type bag, which is a three-sided sealed or four-sided sealed type bag. In the case, an exhaust path having the bent structure is provided at one of the upper, lower, left, and right edge portions, and an outer heat seal portion is provided at an edge portion different from the edge portion provided with the exhaust path, and the inside thereof is provided inside. A zipper-type fastener that can be opened and closed is provided. In the case of a pillow-type bag, the above-described bent structure exhaust path is provided at the back seal portion or at one of the upper, lower, left and right edge portions, and further, the back seal portion. Or, a configuration in which a zipper-type fastener that can be opened and closed is provided inside the outer heat seal portion together with an outer heat seal portion at an edge portion different from the edge portion provided with the exhaust path among the upper, lower, left and right edge portions. A basic, as the shape of the bag,
Furthermore, on the innermost surface of the bag, a configuration in which fine irregularities are provided to prevent the inner surfaces from adhering to each other, and the opening position of the exhaust path, and between the zipper-type fastener and the outer heat seal portion. It includes a configuration in which perforated lines are provided, and each perforated line is provided with the easy-opening means.

Such a food bag is an application of a three-sided or four-sided sealed bag or a pillow-type bag, and is a conventionally known three-sided or four-sided sealed bag making machine or a pillow-type bag. Utilizing a packaging machine or its bag making apparatus, a heat sealing apparatus for forming the exhaust path therein, a punching apparatus for providing an easy-opening means such as a notch, a half-cut line, a laser beam irradiation apparatus, and the like. In addition, it can be easily manufactured by adding a zipper-type fastener attaching device and a heat-sealing device for a heat-sealing portion outside the zipper-type fastener.

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.

[0037]

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. FIG. 1 is a plan view showing the configuration of an embodiment of the food bag of the present invention. FIG. 2 is a perspective view showing the configuration of another embodiment of the food bag of the present invention, in which the food bag is formed in a pillow form, and is seen from the exhaust path side provided on the back seal portion. FIG.

The food bag 100 shown in FIG. 1 is constructed by applying a four-sided seal type bag, and has a laminated film 1 on both sides where the sealant layers are opposed to each other and overlapped.
Zipper type fastener 10 on the inner surface of the upper edge
The outer edge portion is heat-sealed with the upper seal portion 3, and one of the left and right side portions (the left side in the figure) has a side seal portion having a predetermined width. Heat seal in part 2 and the other (right side in the figure)
In order to provide a bent exhaust path for adjusting the internal pressure in this portion, the side edge is heat-sealed with an exhaust path forming seal portion 5 having the illustrated shape to form a bag whose lower part 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 is composed of 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 and 8. A cut line 7a for cutting the outer heat seal portion to open the exhaust passages 8 when heating the contents, and a notch 6a at the end thereof are provided at the outer edge of the exhaust passage forming seal portion 5. Are provided. The food bag 100
Zipper-type fastener 10 provided at the upper edge of the zipper
And a heat seal portion on the outside thereof, that is, an upper seal portion 3
Also, a cutout line 7b of the content take-out opening indicating the unsealing position when taking out the heated content is provided, and a notch 6b is provided at the end thereof.

The cutout 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. 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.

By adopting such a configuration, since the food bag 100 is a four-sided seal type bag, it is easy to make the bag, the heat seal is stable, and the productivity is excellent. Since the unevenness is provided, the opening of the bag is good and the filling of the contents is excellent, and the contents can be safely sealed, packaged and distributed. In addition, when the contents are used, the heat seal portion at the tip end of the exhaust passages 8, 8 can be easily cut out along the cutting line 7a by using the notch 6a. Opened,
The internal pressure adjusting function becomes operable.

Therefore, the bag 100 in this state is laid in a microwave oven or the like as it is, and the contents are heated, so that the internal pressure of the bag increases due to the vapor generated from the contents and reaches a predetermined internal pressure. The exhaust paths 8, 8 are opened, and the steam is discharged to the outside through the paths indicated by arrows. 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. Also, the exhaust passages 8, 8
Is located on the side of the bag 100 laid down, but because the bag is swelled with the filled contents and steam, it is at a position lifted from the bottom surface, and even if the contents include liquids, Never.

Since the exhaust passages 8 and 8 have a narrow width and a bent structure, a pressure loss occurs when steam is discharged, and the inside of the bag 100 is maintained at a constant pressure. Therefore, since the content can be heated while applying an appropriate pressure of the heating steam, temperature unevenness is small,
Heating or cooking suitable for the contents can be performed in a short time.

When removing the contents after heating or cooking, first, a heat-sealing portion outside the zipper-type fastener 10 provided at the upper edge of the bag 100,
That is, the upper seal portion 3 is cut along the cut line 7b using the notch 6b and opened, and then, the fitting of the zipper type fastener 10 is released, whereby the upper seal portion 3 is disengaged.
Since the upper part of the bag can be largely opened, the contents can be easily taken out.

Since the zipper type fastener 10 and the exhaust passages 8, 8 are provided at the edges adjacent to each other, during the above-mentioned opening operation, the exhaust passages 8, 8 may not be located on the lower side. In addition, even if the content contains a liquid material, it can be safely taken out without spilling. Furthermore, since the food bag 100 is provided with the exhaust passages 8 and 8 and the zipper-type fastener 10 without impairing its function even after use, it is washed and dried, and then encapsulates a favorite food. Can be reused.

Next, the food bag 200 shown in FIG. 2 is constructed by applying a pillow type bag. That is, 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, and the front ends of the folded laminated films are opposed to each other so that the sealant layers face each other. To make a back seal part, and make the back seal part wider than usual,
The exhaust passages 8, 8 having a bent structure for internal pressure adjustment by heat sealing with the exhaust passage forming seal portion 5 having the illustrated shape and a heat seal portion for sealing the distal end thereof are formed into a cylindrical body. One side of the body (right side in the figure)
A zipper-type fastener 10 is attached by heat bonding to the inner surface of the edge portion, and the outside thereof is heat-sealed with the side seal portion 2 and one of the upper and lower openings, in this case, the upper portion Is heat-sealed by the upper seal portion 3 to form a bag with a lower opening. The lower opening portion is filled with the contents from this portion, and then heat-sealed with the lower seal portion 4 to be sealed. The portion of the lower opening where the end of the zipper-type fastener 10 extends is preheated by the auxiliary seal portion 9 so that the fitting of the fastener 10 does not come off when the contents are filled. It is preferable to keep it sealed.

A cutting line 7a for cutting the outer heat seal portion and opening the exhaust passages 8 when heating the contents is provided on the outer edge portion of the exhaust passage forming seal portion 5 and the cut line 7a. A notch 6a is provided at the end, and the heated content is taken out at a position close to the side seal portion 2 between the zipper type fastener 10 and the outer side seal portion 2. A cutout line 7b of the content take-out port indicating the opening position and a notch 6b at the end thereof are provided.

The heat seal portion provided outside the zipper type fastener 10, that is, the side seal portion 2
In this case, when tearing the outer edge of the zipper type fastener 10 along the cut line 7b and opening it,
It is provided to stabilize the direction of the tear line along the time of sealing the side seal portion 2, and can be omitted when unnecessary.

The cut line 7a for opening the exhaust passages 8, 8 and the notch 6a at the end of the cut line 7a are designed so that the heat seal portions outside the exhaust passages 8, 8 can be cut off and opened. Along the heat seal part inside,
Although provided in the vertical (up-down) direction of the bag 200, it is not always necessary to cut off the outer heat seal portion to open the exhaust passages 8, 8. A notch 6a is provided at the outside end of the exhaust passages 8 and 8 at a position in front of the center of the outlets, and the notch 6a is traversed from the notch 6a to a position near the center of the outlets of the exhaust passages 8 and 8. A cutout line 7a can be provided in the horizontal (width) direction of 200. In this case, the notch 6a is used to cut and cut the exhaust passage forming seal portion 5 along the perforated line 7a from the outer end thereof to a position near the center of the outlet of the exhaust passages 8,8. The exhaust passages 8, 8 are opened, whereby the internal pressure can be adjusted. This is the same in the food bag 100 shown in FIG.

In this case, the cut lines 7a and 7b may also be displayed only by printing. In addition, an easy-opening means such as a half cut line or a cut tape may be combined with the notches 6a and 6b. It can also be provided.
Although not shown in the drawing, the innermost surface of the food bag 200, that is, the surface of the sealant layer of the laminated film 1 can be formed in the shape having the fine irregularities.

By adopting such a configuration, the food bag 200 is of a pillow pouch type, which facilitates bag making and is excellent in productivity, and has fine irregularities on the innermost surface of the bag. In addition, the openability of the bag is good, and the filling of the contents is excellent, and the contents can be safely sealed, packaged and distributed. In addition, when the contents are used, the heat seal portion at the end of the exhaust passages 8 and 8 can be easily cut along the cut line 7a by using the notch 6a.
The exhaust paths 8, 8 are opened, and the internal pressure adjusting function can be operated.

Therefore, the bag 200 in this state is placed in a microwave oven or the like with the exhaust passages 8, 8 provided at the positions of the back seals thereof facing upward, and the contents are heated. When the internal pressure of the bag rises due to the steam generated from the air, and reaches a certain internal pressure, the exhaust passages 8 and 8 are opened,
Steam is discharged to the outside along the path indicated by the arrow. At this time,
Since the innermost surfaces of the exhaust passages 8, 8 are also provided with fine irregularities, the inner surfaces do not adhere to each other, and the exhaust passages 8, 8 are opened smoothly as the internal pressure increases.

The width 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 200 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.

When the contents after heating or cooking are taken out, first, a heat seal portion outside the zipper type fastener 10 provided on the side edge of the bag 200,
That is, the side seal portion 2 is cut off along the cutout line 7b using the notch 6b and opened, and then the fitting of the zipper type fastener 10 is released to release.
Since the side portion of the bag 200 can be greatly opened,
The contents can be easily taken out. Also in this case, since the exhaust passages 8 and 8 are not located on the lower side during the opening operation, even if the contents include a liquid material, the contents can be safely taken out without spilling. Furthermore, since the food bag 200 is provided with the exhaust passages 8 and 8 and the zipper-type fastener 10 without impairing its functions even after use, the bag 200 is washed and dried, and then encapsulates a favorite food. Can be reused.

(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 CPP film for the innermost sealant layer, and using the outermost PET film After performing four-color pattern printing (including cutting line printing) by gravure printing on the inner surface (laminated surface) of, each film is bonded by a dry lamination method using a polyurethane-based two-component curable adhesive, Further, the entire bottom surface of the CPP film is formed by a hot embossing method with a square bottom surface of 0.8 mm and a height of 1 mm.
A laminated film was prepared by molding irregularities having a trapezoidal projection of 0 μm arranged around the periphery thereof with an interval of 0.7 mm.

Using the above-described laminated film, the dimensions of each part are set as follows by a bag making machine for a four-sided seal bag incorporating a zipper type fastener mounting device, and the structure for the food shown in FIG. 1 is used. A bag was made. The outer dimensions of the bag are 230 mm in width and 220 mm in length. The zipper-type fastener 10 is attached to the upper edge by aligning it with the perforated line 7b, and the outer heat seal portion (upper seal portion) is attached. 3) heat sealing, and
Exhaust passages 8, 8 of the illustrated shape are formed in a space of 45 mm wide and 220 mm long on the right side edge by heat sealing and aligned with the perforated line 7 a, and the left side edge is formed. The part is heat-sealed with the side seal part 2,
After the individual bags were cut off, notches 6a and 6b were provided at predetermined positions by a separately prepared punching device to produce a food bag having the structure shown in FIG. In addition, the exhaust paths 8, 8
Was 8 mm wide at the minimum. The zipper type fastener 10 was made of polypropylene.

After the food bag prepared as described above is filled and sealed with frozen omurice as a content, the heat seal portion at the end of the exhaust path is cut along the cut line 7a and opened, and the bag is filled with 500 W of water. 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. In addition, frozen raw fish (bonito) with sauce
In the same manner, when the mixture filled with 00 g was heated in a microwave oven for 7 minutes, steam was discharged from the exhaust path at an appropriate internal pressure, the bag was not broken, and the sauce was not spilled out. We could cook as delicious as when we boiled it.

When removing the contents after heating or cooking, the upper seal portion 3 is cut along the cut line 7b using the notch 6b, and the fitting of the zipper type fastener 10 is released. The take-out port could be easily opened, and the take-out could be safely taken out without any dripping from the exhaust path during the opening operation. In addition, after washing the used food bag, after filling the frozen hamburger, Shumai, etc., and heating it similarly in the microwave, the fitting of the zipper type fastener does not come off, just like the first time Good heating was achieved.

[0059]

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. At the time of use of the contents, only by a simple operation of cutting off and opening the heat seal portion at the end of the exhaust path provided at the edge of the bag, using the bag by heating means such as a microwave oven, The contents can be thawed, heated, or cooked in a short time while applying an appropriate internal pressure due to the generated steam, etc.When removing the contents, heat the outside of the zipper type fastener. By cutting off the seal part, the bag can be easily opened using a zipper type fastener, and the contents can be safely and easily taken out. Further, the used food bag can be reused. An effect that can be provided with good productivity excellent food bags to use aptitude that kill.

[Brief description of the drawings]

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laminated film 2 Side seal part 3 Upper seal part 4 Lower seal part 5 Exhaust path formation seal part 6a, 6b Notch 7a, 7b Cut-off line 8 Exhaust path 9 Auxiliary seal part 10 Zipper type fastener 100, 200 Food bag

Claims (6)

[Claims] 1. A bag for hermetically packaging a food containing water, wherein the bag is formed in a three-side seal type or a four-side seal type, and an inner edge is provided at one of upper, lower, left and right edges of the bag. When the food stored in the bag is heated together with the bag, an exhaust passage having a bent structure for adjusting the internal pressure of the rising bag to a certain range is provided, and further, an end different from the edge provided with the exhaust passage is provided. On the edge, along with the outer heat seal,
A food bag characterized by being provided with a zipper-type fastener that can be freely opened and closed inside. 2. A bag for hermetically packaging a food containing water, wherein said bag forms a cylindrical body by heat sealing a back seal portion in a joint-sealing manner, 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 any one of the upper, lower, left and right edge portions of the bag, a bent structure exhaust for adjusting the internal pressure of the rising bag to a certain range. A path is provided, further, of the back seal portion or the upper, lower, left and right edge portions, at an edge portion different from the edge portion provided with the exhaust path, together with an outer heat seal portion,
A food bag characterized by being provided with a zipper-type fastener that can be freely opened and closed inside. 3. The food bag according to claim 1, wherein the food bag is formed of a laminated film having any one of linear low-density polyethylene and polypropylene as an innermost layer (sealant layer). Food bag. 4. The food bag according to claim 1, wherein the innermost surface of the food bag is formed in a shape having fine irregularities. 5. The food bag according to claim 1, wherein at least a fitting portion of the zipper-type fastener is formed of polypropylene or methylpentene polymer. 6. A perforated line is provided between an opening position of said exhaust path and between said zipper type fastener and a heat seal portion outside said zipper type fastener, and each perforated line is provided with easy-opening means. The food bag according to any one of claims 1 to 5, wherein: