JP7297405B2 - bag - Google Patents

Description

The present invention relates to a bag with a steam release mechanism.

BACKGROUND ART Conventionally, there are many bags on the market that are filled and sealed with contents of cooked or semi-cooked liquids, viscous substances, or mixtures of liquids and solids in plastic laminates. In the bag, the non-sealed portion where the laminated bodies are not joined constitutes the storage portion in which the contents are stored. Moreover, the sealing portion where the stacked bodies are joined together seals the accommodating portion. The contents are, for example, cooked foods such as curries, stews, and soups. The contents are heated by a microwave oven or the like while being accommodated in the bag.

By the way, when the contents contained in the sealed bag are heated using a microwave oven, the moisture contained in the contents evaporates with the heating, and the pressure in the container increases. If the pressure in the containing portion of the bag increases, the bag may burst, causing the contents to scatter and contaminate the inside of the microwave oven. In consideration of such problems, Patent Document 1, for example, discloses a bottom gusset type steam release mechanism that automatically communicates the storage section with the outside when the pressure of the storage section increases to release the steam inside the storage section to the outside. I suggest putting it in a bag.

JP 2015-120550 A

After heating the contents housed in the bag with a microwave oven, the consumer opens the upper part of the bag and takes out the contents from the opening. By the way, when a bottom gusset type bag is heated in a microwave oven, the width of the lower gusset portion of the bag may widen as the pressure in the containing portion of the bag increases. When the width of the lower part of the bag widens, the surface film and the back film connected to the lower part of the bag are accordingly inclined with respect to the vertical direction, and the gap between the surface film and the back film in the upper part of the bag narrows, resulting in an opening. It becomes difficult to take out the contents from the part.

An object of the present invention is to provide a bag that can effectively solve such problems.

The present invention is a bag having a steam release mechanism and containing contents, comprising a surface film, a back film, and a lower portion positioned between the surface film and the back film and constituting the lower portion of the bag. a film and a first half-cut line formed in the surface film at least partially below the vapor release mechanism, the first half-cut line having a downwardly convex shape at least partially; A bag comprising a half-cut line and a second half-cut line formed in the backing film to at least partially overlap the first half-cut line.

In the bag according to the present invention, at least either one end or the other end of the first half-cut line and at least one of the one end or the other end of the second half-cut line may overlap.

In the bag according to the invention, the first half-cut line may be positioned at least partially below the second half-cut line.

In the bag according to the present invention, the first half-cut line and the second half-cut line may not overlap over the entire area.

In the bag according to the present invention, one end of the first half-cut line and one end of the second half-cut line are positioned on the first side of the bag below the vapor release mechanism, and the first half-cut line The other end of the second half-cut line and the other end of the second half-cut line may be positioned on a second side opposite the first side of the bag below the steam release mechanism.

In the bag according to the present invention, one end of the first half-cut line and one end of the second half-cut line are positioned on the first side of the bag above the vapor release mechanism, and the first half-cut line The other end of the second half-cut line and the other end of the second half-cut line may be located on a second side facing the first side of the bag above the steam release mechanism.

In the bag according to the present invention, the steam release mechanism is located on the first side of the bag, and one end of the first half-cut line and one end of the second half-cut line are below the steam release mechanism. Positioned on the first side of the bag, the other end of the first half-cut line and the other end of the second half-cut line face the first side of the bag above the steam release mechanism It may be located on the second side of the

In the bag according to the present invention, the steam release mechanism is located on the first side of the bag, and one end of the first half-cut line and one end of the second half-cut line are below the steam release mechanism. Positioned on the first side of the bag, the other end of the first half-cut line and the other end of the second half-cut line may be positioned above the bag.

The bag according to the present invention is characterized in that the bag comprises an inner surface of the surface film and the back surface film extending from a first side of the bag to a second side opposite to the first side above the steam release mechanism. It may further comprise a zipper tape provided on the inner surface of the.

According to the present invention, it is possible to improve the ease of taking out the contents.

It is a front view which shows the bag in embodiment of this invention. FIG. 2 is an exploded view showing a film that constitutes the bag shown in FIG. 1; FIG. 2 is a cross-sectional view showing the bag shown in FIG. 1 as viewed along line III-III; FIG. 2 is a cross-sectional view showing an example of the layer structure of a laminate that constitutes a bag; FIG. 4 is a front view showing a bag with its top sealed; FIG. 4 is a perspective view showing the bag in an opened state; It is a front view which shows the example of a changed completely type of bag. It is a front view which shows the example of a changed completely type of bag. It is a front view which shows the example of a changed completely type of bag. It is a front view which shows the example of a changed completely type of bag. It is a front view which shows the example of a changed completely type of bag. It is a front view which shows the example of a changed completely type of bag. It is a front view which shows the example of a changed completely type of bag. It is a front view which shows the example of a changed completely type of bag.

An embodiment of the present invention will be described with reference to FIGS. 1 to 6. FIG. In addition, in the drawings attached to this specification, for convenience of illustration and easy understanding, the scale, the ratio of length and width, etc. are appropriately changed and exaggerated from those of the real thing.

In addition, the terms such as "parallel", "perpendicular", "same" and the like, length and angle values, etc. that specify shapes and geometric conditions and their degrees used in this specification are strictly It shall be interpreted to include the extent to which similar functions can be expected without being bound by the meaning.

FIG. 1 is a front view showing a bag 10 according to this embodiment as seen from the surface side. 2 is an exploded view showing a film that constitutes the bag shown in FIG. 1. As shown in FIG. The bag 10 has a containing portion 18 containing contents. Note that FIG. 1 shows the bag 10 before it is filled with contents. The bag 10 according to the present embodiment is configured so as to be suitable for use as a pouch for microwave ovens whose contents are heated by a microwave oven.

The contents accommodated in the bag 10 are not particularly limited as long as they can be heated by a microwave oven. For example, the contents filled in the bag 10 can include cooked foods such as curry, stew, soup, boiled food, and hamburger steak.

As shown in FIG. 1, the bag 10 according to the present embodiment includes a vapor release mechanism 20, first half-cut lines 25 and second half-cut lines 26. As shown in FIG.
The steam release mechanism 20 is a mechanism for releasing steam generated when heating the contents accommodated in the bag 10 to the outside. The steam venting mechanism 20 allows the inside and outside of the bag 10 to communicate to release the steam when the steam pressure reaches a predetermined value or more, and suppresses the steam venting from places other than the steam venting mechanism 20. - 特許庁so it is configured.
The first half-cut line 25 and the second half-cut line 26 are configured so that the film forming the bag 10 is easily broken along the first half-cut line 25 and the second half-cut line 26 . The first half-cut line 25 and the second half-cut line 26 are used when the consumer opens the bag 10 after heating the contents of the bag 10 using a microwave oven.
The configuration of the bag 10 will be described below.

Bag In this embodiment, the bag 10 is a bottom gusset type bag configured to be able to stand on its own. The bag 10 includes an upper portion 11, a lower portion 12, a first side portion 13 and a second side portion 14 and has a generally rectangular profile in front view. The terms "upper", "lower" and "side", as well as terms such as "upper" and "lower", are based on the state in which the bag 10 stands on its own with the gussets down. It is nothing more than a relative representation of the position and orientation of 10 and its components. The posture of the bag 10 during transportation and use is not limited by the names and terms used in this specification.

As shown in FIG. 1 , the bag 10 includes a front film 15 forming the front surface, a back film 16 forming the back surface, and a lower film 17 forming the lower portion 12 . The lower film 17 is arranged between the surface film 15 and the back film 16 while being folded back at the folding portion 17f. In FIG. 1, components such as the back film 16, which are not visible when the bag 10 is viewed from the front side, are indicated by dotted lines.

The terms "surface film", "back surface film", and "lower film" described above merely refer to sections of each film according to their positional relationship, and the method of providing the films when manufacturing the bag 10 is as follows: Do not be limited by the above terms. For example, the bag 10 may be manufactured using one film in which the surface film 15, the back film 16, and the bottom film 17 are continuously provided, or one film in which the surface film 15 and the bottom film 17 are continuously provided. It may be manufactured using a total of two films, a film and a backing film 16, or a total of three films, one fronting film 15, one backing film 16, and one bottom film 17. may be manufactured using

The inner surfaces of the surface film 15, the back film 16 and the lower film 17 are joined together by sealing portions. In the plan view of the bag 10 such as FIG. 1, the sealing portion is hatched.

As shown in FIG. 1 , the seal portion has an outer edge seal portion extending along the outer edge of the bag 10 and a steam release seal portion 20 a that constitutes the steam release mechanism 20 . The outer edge seal portion includes a lower seal portion 12a extending over the lower portion 12, a first side seal portion 13a extending along the first side portion 13, and extending along a second side portion 14 opposite the first side portion 13. It includes a second side seal portion 14a. The steam release seal portion 20a is connected to the first side seal portion 13a. As shown in FIG. 1, the upper portion 11 of the bag 10 is an opening 11b before the bag 10 is filled with contents. After the contents are contained in the bag 10, the inner surface of the surface film 15 and the inner surface of the back film 16 are joined at the upper portion 11 to form an upper sealing portion and seal the bag 10. As shown in FIG.

The first side seal portion 13a, the second side seal portion 14a, the vapor release seal portion 20a, and the top seal portion are seal portions configured by joining the inner surface of the surface film 15 and the inner surface of the back film 16. be. On the other hand, the lower seal portion 12a is formed by joining the inner surface of the front film 15 and the inner surface of the lower film 17 together, and by joining the inner surface of the back film 16 and the inner surface of the lower film 17 together. including a configured seal.

As long as the opposing films can be joined together to seal the bag 10, the method for forming the seal portion is not particularly limited. For example, the inner surface of the film may be melted by heating and the inner surfaces may be welded to each other, that is, by heat sealing to form the sealed portion. Alternatively, the sealing portion may be formed by bonding the inner surfaces of the films facing each other using an adhesive or the like.

Steam Release Mechanism Next, the configuration of the steam release mechanism 20 will be described. FIG. 3 is a cross-sectional view showing the steam release mechanism 20 of the bag 10 shown in FIG. 1 as viewed along line III--III.

The steam release seal portion 20a of the steam release mechanism 20 has a shape that is easily peeled off as the pressure of the housing portion 18 increases. For example, the steam release seal portion 20a has a shape protruding toward the inside of the bag 10 from the first side seal portion 13a. As a result, the force applied to the steam release seal portion 20a when the pressure in the housing portion 18 increases can be made larger than the force applied to the first side seal portion 13a. Also, the width of the steam release seal portion 20a is smaller than the width of the first side seal portion 13a. 1 and 3, a non-sealed portion 20b is formed between the steam release seal portion 20a and the outer edge of the first side portion 13. As shown in FIGS. Accordingly, communication between the housing portion 18 and the outside due to peeling of the seal portion can be more easily generated in the vapor release seal portion 20a than in the first side seal portion 13a.

First Half-cut Line and Second Half-cut Line Next, the first half-cut line 25 and the second half-cut line 26 will be described. A first half-cut line 25 is formed on the front film 15 and a second half-cut line 26 is formed on the back film 16 .

As shown in FIG. 1 , the first half-cut line 25 has one end 25 a located on the first side 13 below the steam venting mechanism 20 and one end 25 a located on the second side 14 below the steam venting mechanism 20 . , and extends from the first side 13 to the second side 14 . In addition, the first half-cut line 25 has a curved shape that protrudes downward over its entire area.

In FIG. 1, symbol H1 represents the vertical distance between one end 25a or the other end 25b of the first half-cut line 25 and the lowest portion of the first half-cut line 25. As shown in FIG. The distance H1 is, for example, 3 mm or more, preferably 10 mm or more. Also, the distance H1 is, for example, 50 mm or less, preferably 20 mm or less.

The second half-cut line 26 is a half-cut line formed on the back film 16 so as to at least partially overlap the first half-cut line 25 . In the example shown in FIG. 1 , the second half-cut line 26 has one end 26 a that overlaps one end 25 a of the first half-cut line 25 and the other end 26 b that overlaps the other end 25 b of the first half-cut line 25 . Also, the second half-cut line 26 extends linearly from the first side portion 13 to the second side portion 14 . In the example shown in FIG. 1, the direction in which the second half-cut line 26 extends is parallel to the horizontal direction. Therefore, the second half-cut line 26 is located above the first half-cut line 25 except for the one end 26a and the other end 26b. In other words, the first half-cut line 25 is located below the second half-cut line 26 except for the one end 25a and the other end 25b. It can also be expressed that the first half-cut line 25 and the second half-cut line 26 are at least partially separated in the vertical direction. Although not shown, the second half-cut line 26 may extend in a direction inclined with respect to the horizontal direction.

In FIG. 1, symbol H2 represents the maximum distance between the first half-cut line 25 and the second half-cut line 26 in the vertical direction. The maximum distance H2 is, for example, 3 mm or more, and more preferably 10 mm or more. Also, the maximum distance H2 is, for example, 50 mm or less, and more preferably 20 mm or less. If the second half-cut line 26 extends straight in the horizontal direction, the maximum distance H2 is equal to the distance H1 described above.

Next, the structure of the first half-cut line 25 and the second half-cut line 26 formed on the surface film 15 and the back film 16 will be described together with the layer structure of the laminate 30 that constitutes the surface film 15 and the back film 16. 4 for explanation.

First, the layer structure of the laminate 30 will be described. The laminate 30 includes at least a base material layer 31 and a sealant layer 32 . In the example shown in FIG. 4 , the base layer 31 constitutes the outer surface 30 y of the laminate 30 and the sealant layer 32 constitutes the inner surface 30 x of the laminate 30 . Moreover, the laminate 30 may further include an adhesive layer 33 that bonds the base material layer 31 and the sealant layer 32 together. The thickness of the laminate 30 is, for example, 60 μm or more, more preferably 70 μm or more. Moreover, the thickness of the laminate 30 is, for example, 110 μm or less, and more preferably 100 μm or less.

As a material constituting the base material layer 31, for example, polyester such as polyethylene terephthalate and polybutylene terephthalate, polyamide such as nylon, and plastic such as polyolefin such as high-density polyethylene and polypropylene can be used. The thickness of the base material layer 31 is, for example, 10 μm or more and 30 μm or less.

As a material for forming the sealant layer 32, for example, polyethylene such as ethylene-methacrylic acid copolymer (EMMA), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), or polypropylene can be used.

In order to improve the heat resistance of the sealant layer 32, it is preferable to use a material containing propylene as a main component as the material constituting the sealant layer 32. FIG. Here, the material "mainly composed of propylene" means a material having a propylene content of 90% by mass or more. Specific examples of materials containing propylene as a main component include polypropylenes such as propylene/ethylene block copolymers, propylene/ethylene random copolymers, and homopolypropylenes, and mixtures of polypropylene and polyethylene. can be done. Here, "propylene/ethylene block copolymer" means a material having a structural formula shown in formula (I) below. Further, the “propylene/ethylene random copolymer” means a material having the structural formula shown in formula (II) below. Further, "homopolypropylene" means a material having a structural formula shown in formula (III) below.

When a mixture of polypropylene and polyethylene is used as the propylene-based material, the material may have a sea-island structure. Here, the "sea-island structure" refers to a structure in which polyethylene is discontinuously dispersed within a region in which polypropylene is continuous.

Examples of materials that constitute the sealant layer 32 may include polyethylene, polypropylene, or combinations thereof. Examples of polyethylene include medium density polyethylene, linear low density polyethylene, or combinations thereof.

Preferably, sealant layer 32 comprises a propylene-ethylene block copolymer. For example, the sealant layer 32 is composed of an unstretched film containing a propylene-ethylene block copolymer as a main component. The content of the propylene/ethylene block copolymer in the sealant layer 32 is, for example, 80% by mass or more, preferably 90% by mass or more. As a method for producing a propylene/ethylene block copolymer, there is a method of polymerizing raw materials such as propylene and ethylene using a catalyst. A Ziegler-Natta type catalyst, a metallocene catalyst, or the like can be used as the catalyst.

Moreover, the sealant layer 32 may further contain a thermoplastic elastomer. The thermoplastic elastomer is, for example, a hydrogenated styrene thermoplastic elastomer. The hydrogenated styrenic thermoplastic elastomer has a structure consisting of a polymer block A mainly composed of at least one vinyl aromatic compound and a polymer block B mainly composed of at least one hydrogenated conjugated diene compound. . The thermoplastic elastomer may also be an ethylene/α-olefin elastomer. Ethylene/α-olefin elastomers are low-crystalline or amorphous copolymer elastomers, and are random copolymers of 50 to 90% by mass of ethylene as a main component and α-olefin as a copolymerization monomer. be.

The thickness of the sealant layer 32 is, for example, 40 μm or more, more preferably 50 μm or more. Also, the thickness of the sealant layer 32 is, for example, 100 μm or less, and more preferably 70 μm or less.

Next, the structure of the first half-cut line 25 and the second half-cut line 26 will be described. As shown in FIG. 4 , the first half-cut line 25 and the second half-cut line 26 include non-through holes 27 formed in the outer surface 30 y of the laminate 30 . In the example shown in FIG. 4 , the non-through holes 27 are configured to penetrate the base material layer 31 and reach the adhesive layer 33 . Although not shown, the non-through holes 27 may be configured so as not to penetrate the base material layer 31 .

The width S2 and the depth S3 of the non-through hole 27 of the first half-cut line 25 and the second half-cut line 26 are such that when the user applies an appropriate force to the bag 10, the first half-cut line 25 and the second half-cut line 25 and the second half-cut line 26 It is set so that the half-cut line 26 breaks. For example, the width S2 of the non-through hole 27 is 10 μm or more and 1 mm or less. Also, the depth S3 of the non-through hole 27 is, for example, 5 μm or more and 10 μm or less. Such non-through holes 27 can be formed, for example, by processing the laminate 30 by irradiating the laminate 30 with a laser beam from the outer surface 30y side. Alternatively, the non-through hole 27 may be formed by processing the laminate 30 from the outer surface 30y side using a cutting blade or the like.

Layer Structure of Lower Film Next, the layer structure of the lower film 17 will be described.

The layer structure of the lower film 17 is arbitrary as long as it has an inner surface that can be bonded to the inner surface of the front film 15 and the inner surface of the back film 16 . For example, the laminate 30 described above may be used as the lower film 17 in the same manner as the surface film 15 and the back film 16 . Alternatively, a film whose inner surface is composed of a sealant layer and whose composition is different from that of the laminate 30 may be used as the lower film 17 .

Method for Manufacturing Bag Next, a method for manufacturing the above-described bag 10 will be described. First, the surface film 15 and the back film 16 each made of the laminate 30 are prepared. In addition, the folded lower film 17 is inserted between the surface film 15 and the back film 16 . Subsequently, the inner surfaces of each film are heat-sealed to form seals such as a lower seal 12a, a first side seal 13a, and a second side seal 14a. Also, the films bonded together by heat sealing are cut into a suitable shape to obtain the bag 10 shown in FIG. Subsequently, the content 19 is filled into the bag 10 through the opening 11b of the upper portion 11. As shown in FIG. After that, the upper portion 11 is heat-sealed to form an upper seal portion 11a. In this way, as shown in FIG. 5, the sealed bag 10 containing the contents 19 can be obtained.

Method for Opening Bag Next, a method for opening the bag 10 will be described. First, the bag 10 is placed inside the microwave oven with the lower part 12 facing down and the bag 10 standing on its own. Next, heat the contents using a microwave oven. As a result, the temperature of the contents 19 rises, and along with this, the moisture contained in the contents 19 evaporates and the pressure in the containing section 18 increases. When the pressure in the accommodating portion 18 increases, the surface film 15 and the back film 16 bulge outward, force is applied to the steam release seal portion 20a of the steam release mechanism 20, and the steam release seal portion 20a is peeled off. As a result, the steam in the housing portion 18 can be released to the outside through the non-sealed portion 20b of the steam release mechanism 20. As shown in FIG.

Subsequently, the bag 10 is torn from one of the first side 13 or the second side 14 along the first half-cut line 25 and the second half-cut line 26 to the other. As a result, as shown in FIG. 6, the bag 10 can be unsealed to form an opening at the top. As shown in FIG. 6, the portion of the surface film 15 torn along the first half-cut line 25 becomes the first opening edge 25e of the opening, and the back film 16 is cut along the second half-cut line 26. The torn portion becomes the second opening edge 26e of the opening.

Incidentally, when the bottom gusset type bag 10 is heated in a microwave oven, as shown in FIG. When the width W1 of the lower portion 12 of the bag 10 widens, the surface film 15 and the back film 16 that are connected to the bottom of the bag 10 are accordingly inclined with respect to the vertical direction. The gap with the film 16 becomes narrower. In FIG. 6, reference W2 denotes an opening when it is assumed that the half-cut line formed on the surface film 15 is a horizontal half-cut line 25f extending linearly in the horizontal direction like the second half-cut line 26. represents the width of the part. The width W2 of the opening in this case is narrower than the width W1 of the lower portion 12 of the bag 10, making it difficult to take out the contents from the opening.

Here, in the present embodiment, the first half-cut line 25 formed on the surface film 15 has a downward convex shape. Therefore, the width of the opening of the bag 10 can be increased compared to the case where the horizontal half-cut line 25f extending linearly in the horizontal direction is formed in the surface film 15. FIG. Thereby, the ease of taking out the contents can be improved. As a result, for example, the contents stored in the bag 10 can be eaten as they are using a spoon or the like without being transferred to another container such as a plate. Of course, the contents housed in the bag 10 may be taken out to another container such as a plate. In this case as well, the widening of the opening of the bag 10 makes it easier to take out the contents.

In addition, in the present embodiment, the first half-cut line 25 is positioned below the second half-cut line 26 at portions other than the one end 25a and the other end 25b. The distance between the surface film 15 and the back film 16 increases toward the lower portion 12. - 特許庁Therefore, by positioning the first opening edge 25e of the opening further downward, the width of the opening can be increased, and the ease of taking out the contents can be improved. In addition, since the second opening edge 26e of the back film 16 is located above the first opening edge 25e of the surface film 15, the contents are taken out from the opening while pressing the contents against the inner surface of the back film 16. becomes possible. In this respect as well, the ease of taking out the contents can be improved.

Further, in the present embodiment, one end 25 a of the first half-cut line 25 and one end 26 a of the second half-cut line 26 positioned on the first side portion 13 are positioned below the vapor venting mechanism 20 . Therefore, by tearing the bag 10 along the first half-cut line 25 and the second half-cut line 26, as shown in FIG. can do.
Since the steam release seal portion 20a of the steam release mechanism 20 protrudes inward, if the steam release mechanism 20 remains in the bag 10, there is a possibility of hindering the taking out of the contents. Therefore, by removing the steam release mechanism 20 when tearing the bag 10, the ease of taking out the contents can be improved.
Moreover, if the vapor release mechanism 20 remains in the bag 10, the contents may leak out through the unsealed portion 20b when the contents are taken out. Therefore, by removing the vapor release mechanism 20 when tearing the bag 10, it is possible to suppress the occurrence of such leakage.

Various modifications can be made to the above-described embodiment. Modifications will be described below with reference to the drawings as necessary. In the following description and the drawings used in the following description, the same reference numerals as those used for the corresponding portions in the above-described embodiment are used for the portions that can be configured in the same manner as in the above-described embodiment, Duplicate explanations are omitted. Further, when it is clear that the effects obtained in the above-described embodiment can also be obtained in the modified example, the explanation thereof may be omitted.

(First modification of first half-cut line and second half-cut line)
In the above-described embodiment, the example in which the first half-cut line 25 is positioned partially below the second half-cut line 26 is shown. However, it is not limited to this, and as shown in FIG. 7, the first half-cut line 25 and the second half-cut line 26 may overlap over the entire area.

(Second modification of first half-cut line and second half-cut line)
Further, in the above-described embodiment, one end 25a of the first half-cut line 25 and one end 26a of the second half-cut line 26 are positioned on the first side portion 13 below the vapor release mechanism 20, An example in which the other end 25b of the half-cut line 25 and the other end 26b of the second half-cut line 26 are located on the second side portion 14 below the vapor release mechanism 20 is shown. However, the invention is not limited to this, and as shown in FIG. 13 , and the other end 25 b of the first half-cut line 25 and the other end 26 b of the second half-cut line 26 may be positioned on the upper portion 11 of the bag 10 . In this case, since most of the portion on the second side 14 side remains in the opened bag 10, the consumer can hold the portion on the second side 14 side with a hand or the like. As a result, it becomes easier to control the attitude of the bag 10, so that the ease of taking out the contents can be improved.

In the example shown in FIG. 8 also, although not shown, the first half-cut line 25 and the second half-cut line 26 may be at least partially separated in the vertical direction.

(Third modification of first half-cut line and second half-cut line)
As shown in FIG. 9, one end 25a of the first half-cut line 25 and one end 26a of the second half-cut line 26 are located on the first side portion 13 below the vapor release mechanism 20, and the first half-cut line The other end 25 b of the second half-cut line 26 and the other end 26 b of the second half-cut line 26 may be positioned on the second side portion 14 above the vapor release mechanism 20 . In the example shown in FIG. 9, as in the example shown in FIG. 8, a large portion of the opened bag 10 on the side of the second side 14 remains. can be held by hand or the like. As a result, it becomes easier to control the attitude of the bag 10, so that the ease of taking out the contents can be improved.

In the example shown in FIG. 9 also, although not shown, the first half-cut line 25 and the second half-cut line 26 may be at least partially separated in the vertical direction.

(Fourth modification of first half-cut line and second half-cut line)
In addition, in the above-described embodiment and each modified example, one end 25a of the first half-cut line 25 and one end 26a of the second half-cut line 26 are positioned on the first side portion 13 below the vapor release mechanism 20. I showed an example to do. However, the invention is not limited to this, and as shown in FIG. 13 , the other end 25 b of the first half-cut line 25 and the other end 26 b of the second half-cut line 26 may be positioned on the second side portion 14 above the vapor release mechanism 20 . In this case, as shown in FIG. 10 , the first half-cut line 25 has a downwardly convex curved shape so as to be positioned partially below the vapor release mechanism 20 .

In the example shown in FIG. 10, the vertical distance H1 between one end 25a or the other end 25b of the first half-cut line 25 and the lowest portion of the first half-cut line 25 is, for example, 20 mm. or more, preferably 30 mm or more. Also, the distance H1 is, for example, 70 mm or less, preferably 50 mm or less.

As shown in FIG. 10 , the second half-cut line 26 may extend linearly in the horizontal direction from the first side portion 13 to the second side portion 14 . In this case, the maximum distance H2 between the first half-cut line 25 and the second half-cut line 26 in the vertical direction is, for example, 20 mm or more, and more preferably 30 mm or more. Also, the maximum distance H2 is, for example, 70 mm or less, and more preferably 50 mm or less.

Although not shown, the second half-cut line 26, like the first half-cut line 25, also has a downwardly convex curved shape so as to be positioned partially below the vapor release mechanism 20. may Also, the second half-cut line 26 may overlap the first half-cut line 25 over the entire area.

(Other modifications of the first half-cut line and the second half-cut line)
In the above-described embodiment and modifications, the end 25a of the first half-cut line 25 overlaps the one end 26a of the second half-cut line 26, and the other end 25b of the first half-cut line 25 overlaps the second half-cut line 25. An example in which the other end 26b of the half-cut line 26 overlaps is shown. However, the present invention is not limited to this. It's okay if they overlap.

(Example of providing zipper tape)
As shown in FIG. 11, bag 10 may further include zipper tape 28 extending from first side 13 to second side 14 . The zipper tape 28 has a first member provided on the inner surface of the surface film 15 and a second member provided on the inner surface of the back film 16 and capable of being fitted with the first member, although not shown. By providing the zipper tape 28 on the bag 10, the bag 10 before being heated can be freely opened or sealed.

As shown in FIG. 11, the first side seal portion 13a or the second side seal portion 14a above the steam release mechanism 20 is formed with an opening start portion 29 that serves as a trigger for tearing the bag 10. may The opening start portion 29 is, for example, a notch or a notch.

An example of how to use the bag 10 shown in FIG. 11 will be described. First, the bag 10 is opened by tearing the bag 10 with the opening start portion 29 as a starting point. Subsequently, one of the first member and the second member of the zipper tape 28 is removed from the other, and the seasoning or the like is put into the container 18 through the opening of the zipper tape 28 . After that, one of the first member and the second member of the zipper tape 28 is fitted to the other to seal the bag 10, and in this state, the contents are heated using a microwave oven. When the pressure in the housing portion 18 increases, force is applied to the steam release seal portion 20a of the steam release mechanism 20, and the steam release seal portion 20a is peeled off. Subsequently, the bag 10 is cut along the first half-cut line 25 and the second half-cut line 26 from one side of the first side portion 13 or the second side portion 14 to the other in the same manner as in the above embodiment. tear up.

According to this modification, by providing the zipper tape 28 on the bag 10, the bag 10 is opened and a predetermined material such as a seasoning is put into the container 18 before the contents are heated using a microwave oven. can do. Therefore, the degree of freedom of use of the bag 10 can be increased.

(First Modification of Steam Release Mechanism)
In the above-described embodiment, an example in which the non-sealed portion 20b of the vapor release mechanism 20 communicates with the outside of the bag 10 was shown. However, the present invention is not limited to this. As shown in FIG. 12, the non-sealed portion 20b is formed by the first side seal portion 13a and the steam release seal portion 20a connected to the first side seal portion 13a. May be surrounded. That is, the non-sealed portion 20b does not have to communicate with the outside of the bag 10 . In this case, the steam release mechanism 20 further has a through hole 20c formed in at least one of the surface film 15 and the back film 16 in the non-sealed portion 20b.

In the bag 10 shown in FIG. 12, when the pressure in the containing portion 18 increases, force is applied to the steam release seal portion 20a of the steam release mechanism 20, causing the steam release seal portion 20a to peel off. The steam that has flowed into the non-sealed portion 20b through the peeled portion of the steam release seal portion 20a is discharged to the outside through the through hole 20c. As a result, it is possible to prevent the pressure in the housing portion 18 from becoming excessively high.

(Second Modification of Steam Release Mechanism)
In the above-described embodiment and modifications, the steam release seal portion 20a of the steam release mechanism 20 is connected to the first side seal portion 13a. However, the present invention is not limited to this, and as shown in FIG. 13, the steam release seal portion 20a is connected to seal portions on the outer edge of the bag 10 such as the first side seal portion 13a and the second side seal portion 14a. It doesn't have to be. In this case, the steam release mechanism 20 further has a through hole 20c located in the area surrounded by the steam release seal portion 20a.

In the bag 10 shown in FIG. 13 as well, when the pressure in the containing portion 18 increases, force is applied to the steam release seal portion 20a of the steam release mechanism 20, causing the steam release seal portion 20a to peel off. Vapor can escape to the outside through the through hole 20c.

(Third Modification of Steam Release Mechanism)
In the above-described embodiment and modifications, the steam release seal portion 20a of the steam release mechanism 20 is a seal portion formed by joining the inner surface of the front film 15 and the inner surface of the back film 16. Indicated. However, the steam release seal portion 20a is not limited to this, and may be a seal portion formed by joining the inner surfaces of the surface films 15 positioned on the surface side. For example, as shown in FIG. 14, the vapor release seal portion 20a is formed by overlapping the inner surfaces of the surface films 15 at a joint portion where a portion of the surface film 15 on the upper portion 11 side and a portion of the surface film 15 on the lower portion 12 side are overlapped. are formed by joining In this case, as shown in FIG. 14 , the steam release seal portion 20a may be formed between the first side portion 13 and the second side portion 14 .

As shown in FIG. 14, the steam release mechanism 20 includes a non-sealed portion 20b surrounded by a steam release seal portion 20a and a through hole formed in at least one of the surface film 15 and the back film 16 in the non-sealed portion 20b. It also has a hole 20c. In the bag 10 shown in FIG. 14 as well, when the pressure in the containing portion 18 increases, force is applied to the steam release seal portion 20a of the steam release mechanism 20, causing the steam release seal portion 20a to peel off. Vapor can escape to the outside through the through hole 20c.

Although several modifications of the above-described embodiment have been described, it is of course possible to apply a plurality of modifications in appropriate combination.

10 bag 11 upper portion 11a upper seal portion 12 lower portion 12a lower seal portion 13 first side portion 13a first side seal portion 14 second side portion 14a second side seal portion 15 surface film 16 back film 17 lower film 18 storage portion 19 Contents 20 Steam release mechanism 20a Steam release seal portion 20b Unsealed portion 20c Through hole 25 First half-cut line 25e First opening edge 26 Second half-cut line 26e Second opening edge 28 Zipper tape 30 Laminate 31 Base material layer 32 sealant layer 33 adhesive layer

Claims (10)

A self-supporting bottom gusseted bag having a steam release mechanism and containing contents including liquid,
a front film and a back film;
a lower film positioned between the surface film and the back film and forming a lower portion of the bag;
a half-cut line composed only of a first half-cut line formed on the front film and a second half-cut line formed on the back film;
The first half-cut line is positioned at least partially below the steam venting mechanism and at least partially has a downwardly convex shape,
A bag, wherein the second half-cut line at least partially overlaps the first half-cut line. 2. The bag according to claim 1, wherein at least one end or the other end of the first half-cut line overlaps with at least one end or the other end of the second half-cut line. 3. Bag according to claim 1 or 2, wherein the first half-cut line is located at least partially below the second half-cut line. 3. The bag according to claim 1, wherein said first half-cut line and said second half-cut line overlap over the entire area. One end of the first half-cut line and one end of the second half-cut line are positioned on the first side of the bag below the vapor release mechanism,
3. The other end of the first half-cut line and the other end of the second half-cut line are positioned on a second side of the bag facing the first side below the vapor release mechanism. 5. The bag according to any one of 1 to 4. One end of the first half-cut line and one end of the second half-cut line are positioned above the steam venting mechanism on the first side of the bag,
3. The other end of the first half-cut line and the other end of the second half-cut line are positioned on a second side of the bag facing the first side above the vapor release mechanism. 5. The bag according to any one of 1 to 4. the steam release mechanism is located on a first side of the bag;
One end of the first half-cut line and one end of the second half-cut line are positioned on the first side of the bag below the vapor release mechanism,
3. The other end of the first half-cut line and the other end of the second half-cut line are positioned on a second side of the bag facing the first side above the vapor release mechanism. 5. The bag according to any one of 1 to 4. the steam release mechanism is located on a first side of the bag;
One end of the first half-cut line and one end of the second half-cut line are positioned on the first side of the bag below the vapor release mechanism,
5. The bag according to any one of claims 1 to 4, wherein the other end of said first half-cut line and the other end of said second half-cut line are positioned above said bag. The bag is provided on the inner surface of the surface film and the inner surface of the back film so as to extend from the first side of the bag to the second side opposite to the first side above the steam release mechanism. 9. The bag of any one of claims 1-8, further comprising zipper tape. 4. The bag according to any one of claims 1 to 3 , wherein the maximum distance between said first half-cut line and said second half-cut line in the vertical direction is 10 mm or more.

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