JP6938111B2 - bag - Google Patents

Description

The present invention relates to a bag containing a film and containing the contents.

Conventionally, many cooked or semi-cooked liquids, viscous bodies, or contents in which liquids and solids are mixed and sealed in a bag made of a plastic film are on the market. The contents are, for example, cooked foods such as curry, stew, and soup. In the bag, the non-seal portion in which the films are not bonded to each other defines the accommodating portion in which the contents are accommodated. Further, the sealing portion in which the films are bonded to each other seals the accommodating portion. A microwave oven is widely used as a means for cooking the contents.

By the way, when the contents in the bag are heated by using a microwave oven, the water contained in the contents evaporates as the contents are heated, and the pressure in the bag accommodating portion increases. If the pressure in the bag housing increases, the bag may break and the contents may scatter and stain the inside of the microwave oven. In consideration of such a problem, it has been proposed to provide a steam venting mechanism for allowing the steam in the accommodating portion to escape to the outside by communicating with the accommodating portion when the pressure of the accommodating portion of the bag exceeds a predetermined value. For example, Patent Document 1 discloses that, as a steam venting mechanism, a protruding seal portion is formed in a part of the seal portion so as to project inward in a V shape from the seal portion extending along the outer edge of the bag.

JP-A-2002-80072

As a result of diligent research by the inventors of the present invention, in the bag disclosed in Patent Document 1, there was a case where steam could not be properly released to the outside from the V-shaped protruding seal portion. For example, in a bag provided with a V-shaped protruding seal portion that protrudes inward from the seal portion on the upper edge of the bag, when the pressure of the accommodating portion increases, the seal portion on the side edge of the bag or its periphery is destroyed and the bag is provided. In some cases, the contents leaked from the side edge of the bag.

The present invention has been made in consideration of such a point, and an object of the present invention is to provide a bag provided with a vapor release mechanism capable of appropriately releasing the vapor in the accommodating portion to the outside.

The present invention is a bag containing a film and containing the contents, and includes a sealing portion in which the films facing each other are bonded to each other and a non-sealing portion in which the films facing each other are not bonded to each other. The non-seal portion has a first non-seal portion that defines an accommodating portion for accommodating the contents, and the seal portion includes an outer edge seal portion extending along the outer edge of the bag and the outer edge seal portion. The outer edge of the protruding seal portion is connected to the outer edge of the bag, and the outer edge of the protruding seal portion is connected to the protruding seal portion. The point along the portion farthest from one outer edge of the bag is referred to as a tip point, and a straight line extending in an orthogonal direction orthogonal to the one outer edge of the bag and passing through the tip point is referred to as a center line. When a point located on the center line and located in the middle of the accommodating portion in the orthogonal direction is referred to as an intermediate point, the protruding seal portion protrudes toward the intermediate point, and the protruding seal portion is described as described above. When two inscribed straight lines that pass through the intermediate point and are in contact with the inner edge of the protruding seal portion at the inner contact are drawn, they are located on the outer edge side of the inner contact and between the two inscribed straight lines. A pair of first portions located at, and a pair of second portions located on the intermediate point side of the internal contact and between the two inscribed straight lines and connected at the tip point. The angle formed by the pair of second portions at the tip point is less than 180 °.

Preferably, the distance between the outer edge seal portion to which the protruding seal portion is connected and the inner contact in the orthogonal direction is 3 mm or more. Further, preferably, the distance between the tip point and the internal contact in the orthogonal direction is 3 mm or more.

Preferably, the distance between the outer edge seal portion to which the protruding seal portion is connected and the inner contact in the orthogonal direction is referred to as a first distance, and the tip point and the inner contact in the orthogonal direction are referred to as a first distance. When the distance between the two is referred to as the second distance, the value obtained by dividing the first distance by the second distance is 0.3 or more and 3.0 or less.

In the bag of the present invention, both the pair of first portions and the pair of second portions may be line-symmetric with respect to the center line.

In the bag of the present invention, the pair of second portions may have a convex shape that is convex from the inner edge side to the outer edge side thereof.

In the bag of the present invention, the film comprises a first film and a second film, and an intermediate film arranged between the first film and the second film in a folded state, and the protruding seal. The portion may be connected to the outer edge sealing portion formed by bonding the first film and the intermediate film among the outer edge sealing portions.

According to the present invention, the protruding seal portion protruding toward the non-seal portion defining the accommodating portion draws two inscribed straight lines in contact with the inner edge of the protruding seal portion at the inner contact point from the intermediate point of the accommodating portion. In some cases, it includes a pair of first portions located on the outer edge side of the bag with respect to the inner contacts and between the two inscribed straight lines. In this case, the force generated by the increase in the pressure of the accommodating portion is unlikely to act on the pair of first portions. Therefore, it is possible to prevent the films from peeling off from each other in the pair of first portions. As a result, it is possible to prevent the peeling of the films from reaching the outer edge sealing portion connected to the protruding sealing portion. Therefore, it is possible to prevent the contents from leaking out of the bag.

It is a front view which shows the bag by one Embodiment of this invention. FIG. 5 is a cross-sectional view showing a case where the bag shown in FIG. 1 is viewed along the line II-II. It is a figure which shows the steam release mechanism of the bag shown in FIG. 1 in an enlarged manner. It is sectional drawing which shows the case where the steam release mechanism shown in FIG. 3 is seen along line IV-IV. It is sectional drawing which shows an example of the layer structure of a film. It is a figure which shows the process of preparing the film which constitutes a bag. It is a figure which shows the process of connecting films with each other to form a seal part. It is a figure which shows the process of cutting a film along the contour of a bag. It is a figure which shows the process of sealing a bag filled with contents. It is a figure which shows a mode that the pressure of the accommodating portion of a bag is increased and the expansion portion is formed. It is a figure explaining the force acting on the steam release mechanism due to an expansion part. It is a figure explaining the force acting on the steam release mechanism due to an expansion part. It is a figure which shows the state which a part of the protruding seal part of a steam escape mechanism is broken. It is a figure which shows one modification of the steam release mechanism. It is a figure which shows one modification of the steam release mechanism. It is a figure which shows one modification of the steam release mechanism. It is a figure which shows one modification of the steam release mechanism. It is a figure which shows one modification of the steam release mechanism. It is a figure which shows one modification of a bag. It is a figure which shows one modification of a bag. It is a figure which shows the steam release mechanism of the bag which concerns on a comparative example.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 6C. In the drawings attached to the present specification, the scale, aspect ratio, etc. may be appropriately changed from those of the actual product and exaggerated for the convenience of illustration and comprehension.

In addition, as used in the present specification, the terms such as "parallel", "orthogonal", and "identical" and the values of length and angle that specify the shape and geometric conditions and their degrees are strictly used. Without being bound by meaning, we will interpret it including the range in which similar functions can be expected.

FIG. 1 is a front view showing a bag 10 according to the present embodiment. Further, FIG. 2 is a cross-sectional view showing a case where the bag 10 shown in FIG. 1 is viewed along the line II-II. The bag 10 includes an accommodating portion 15 for accommodating the contents. In addition, in FIG. 1 and FIG. 2, the bag 10 in the state before the contents are filled is shown.

As shown in FIG. 1, the bag 10 according to the present embodiment includes a steam release mechanism 30 for releasing steam generated when heating the contents contained in the bag 10 to the outside. The steam release mechanism 30 communicates the inside and the outside of the bag 10 with each other when the pressure of steam exceeds a predetermined value to release the steam and suppresses the release of steam from a place other than the steam release mechanism 30. ,It is configured. Hereinafter, the configuration of the bag 10 will be described.

The bag bag 10 is arranged between the first film 11, the second film 12 facing the first film 11, and the first film 11 and the second film 12 in a state of being folded along the folded portion 13c. The intermediate film 13 and the like are included. FIG. 1 shows a bag 10 when viewed from the side of the first film 11.

The terms "first film", "second film", and "intermediate film" described above merely partition the films constituting the bag 10 according to the positional relationship of the outer surface of the bag 10. The method of providing the film in producing 10 is not limited by the above-mentioned terms. For example, the bag 10 may be manufactured by using one film in which the first film 11, the second film 12, and the intermediate film 13 are connected in series, and the first film 11 and the intermediate film 13 are connected in series. It may be manufactured using a total of two films, one film and one second film 12, and a total of three films, one first film, one second film, and one intermediate film 13. It may be manufactured using a single film.

In the bag 10 according to the present embodiment, the contents contained in the bag 10 are microwaved in a state where the bag 10 is supported or placed so that the second film 12 is located below the first film 11. It is mainly assumed that it will be heated by such means. However, the usage pattern of the bag 10, for example, the specific posture of the bag 10 when heating the contents is not particularly limited. Examples of the contents include cooked or semi-cooked liquids, sticky substances or contents in which liquids and solids are mixed, and cooked foods such as curry, stew, and soup can be mentioned. In addition to food, food that can be heated by a microwave oven or the like may be contained in the bag 10 as contents.

As shown in FIG. 1, the outer edge of the bag 10 is a first upper edge 21 and a second upper edge 22 and a lower edge 23 facing the first upper edge 21 and the second upper edge 22 and facing each other. Includes a side edge 24 and a second side edge 25. The first side edge 24 and the second side edge 25 extend from the first upper edge 21 and the second upper edge 22 toward the lower edge 23. The length of the second upper edge 21 is smaller than the length of the first side edge 24. As shown in FIG. 2, the first upper edge 21 is an outer edge composed of the first film 11 and the intermediate film 13. The second upper edge 22 is an outer edge composed of the second film 12 and the intermediate film 13. In addition, in FIG. 1 and FIG. 2, there is an example in which the wing portion 17 composed of the first film 11 and the intermediate film 13 is folded back toward the second upper edge 22 so that the outer surfaces 13y of the intermediate film 13 are in contact with each other. Although shown, the wing portion 17 may be folded toward the lower edge 23 or may be bent upward. However, the inscribed straight line L2 and the protruding seal portion 33, which will be described later, are defined in the bag 10 in a state of being folded back toward the second upper edge 22 so that the outer surfaces 13y of the intermediate film 13 are in contact with each other.

The intermediate film 13 is inserted between the first film 11 and the second film 12 in a state of being folded back so that the first upper edge 21 is one end and the second upper edge 22 is the other end. In the present embodiment, the first upper edge 21 is located closer to the lower edge 23 than the second upper edge 22. The positional relationship between the first upper edge 21 and the second upper edge 22 is not particularly limited. For example, although not shown, the position of the first upper edge 21 and the position of the second upper edge 22 in the front view may coincide with each other.

In the present embodiment, the first upper edge 21, the second upper edge 22 and the lower edge 23 are parallel to each other, and the first side edge 24 and the second side edge 25 are parallel to each other. Further, the first upper edge 21, the second upper edge 22 and the lower edge 23, and the first side edge 24 and the second side edge 25 are orthogonal to each other. However, as long as the bag 10 includes at least one linear outer edge on which the vapor release mechanism 30 described later is formed, the specific configuration of the outer edge of the bag 10 is not particularly limited.

(Seal part and non-seal part)
Next, the sealed portion and the non-sealed portion will be described. The bag 10 includes a sealing portion in which the inner surfaces of the films are bonded to each other, and a non-sealing portion in which the inner surfaces of the films are not bonded to each other. In FIG. 1, the seal portion is hatched.

The seal portion includes an outer edge seal portion 20a extending along the outer edge of the bag 10 and a protruding seal portion 33 constituting the steam release mechanism 30. The unsealed portion includes a first unsealed portion 20b that defines the accommodating portion 15 in which the contents are accommodated, and a second unsealed portion through which steam passes when the steam generated in the accommodating portion 15 is released to the outside of the bag 10. 20c and. The protruding seal portion 33 will be described in detail later.

The sealing portion is formed by joining any two inner surfaces of the inner surface of the first film 11, the inner surface of the second film 12, and the inner surface of the intermediate film 13. For example, as shown in FIG. 2, the seal portion is formed by joining the inner surface 11x of the first film 11 and the inner surface 13x of the intermediate film 13 along the first upper edge 21, and the first upper edge described later. It includes a sealing portion 21a and a second upper edge sealing portion 22a, which will be described later, formed by joining the inner surface 12x of the second film 12 and the inner surface 13x of the intermediate film 13 along the second upper edge 22.

As long as the accommodating portion 15 can be sealed from the outside, the method for forming the sealing portion is not particularly limited. For example, the seal portion may be formed by melting the layers constituting the inner surfaces of the films 11, 12 and 13 by heating or the like and welding the inner surfaces of the films 11, 12 and 13 to each other. Alternatively, the sealing portion may be formed by adhering the inner surfaces of the films 11, 12, and 13 to each other using an adhesive or the like.

As shown in FIG. 1, the outer edge sealing portion 20a includes a first upper edge sealing portion 21a formed along the first upper edge 21 and a second upper edge sealing portion 22a formed along the second upper edge 22. , A first side edge seal portion 24a formed along the first side edge 24, and a second side edge seal portion 25a formed along the second side edge 25. Further, as will be described later, after filling the accommodating portion 15 with the lower edge 23 as a filling port, a lower edge sealing portion is formed along the lower edge 23 to seal the accommodating portion 15. In FIG. 1, the inner edge of the portion that will later become the lower edge seal portion is indicated by a alternate long and short dash line. In the following description, the portion that will later become the lower edge seal portion will also be referred to as the lower edge seal planned portion 23b.

(Steam release mechanism)
Hereinafter, the configuration of the steam release mechanism 30 will be described with reference to FIGS. 3 and 4. FIG. 3 is an enlarged view of the steam release mechanism 30 shown in FIG. FIG. 4 is a cross-sectional view showing a case where the steam release mechanism 30 shown in FIG. 3 is viewed along the IV-IV line.

The steam release mechanism 30 is configured by giving a part of the seal portion a shape that is easily broken as the pressure of the accommodating portion 15 increases. Specifically, the steam release mechanism 30 has the above-mentioned protruding seal portion 33 and the second non-seal portion 20c. The second non-seal portion 20c is in contact with the outer edge of the protruding seal portion 33 and communicates with the outside of the bag 10. When the pressure of the accommodating portion 15 increases, a part of the protruding seal portion 33 is destroyed, and the steam of the accommodating portion 15 escapes to the outside through the destroyed portion of the protruding seal portion 33 and the second non-sealing portion 20c.

[Protruding seal part]
Hereinafter, the configuration of the protruding seal portion 33 will be described. The protruding seal portion 33 is connected to the outer edge seal portion 20a extending along the outer edge of the bag 10 among the seal portions, and is configured to project toward the first non-seal portion 20b that defines the accommodating portion 15. It is the part that was done. In the present embodiment, the protruding seal portion 33 is connected to the first upper edge seal portion 21a extending along the first upper edge 21.

As shown in FIG. 3, the protruding seal portion 33 includes at least a pair of first portions 33a, a pair of second portions 33b, and a tip point 33c. In the present embodiment, the protruding seal portion 30 has a substantially pentagonal contour. The tip point 33c is one outer edge (here, the first upper edge) of the bag 10 along the outer edge sealing portion 20a (here, the first upper edge sealing portion 21a) to which the protruding sealing portion 33 is connected, among the protruding sealing portions 33. This is the farthest point from the edge 21). The pair of second portions 33b is a pair of protruding seal portions 33 connected at the tip point 33c. In FIG. 3, the angle formed by the pair of second portions 33b at the tip point 33c is indicated by reference numeral θ. The angle θ formed by the pair of second portions 33b at the tip portion 33c is an angle formed by the linear portion of the inner edge of the pair of second portions 33b at the tip portion 33c. When the inner edge of the pair of second portions 33b does not include a linear portion, the angle θ is the straight line connecting the first inner contact P2 and the tip point 33c, and the second inner contact P2 and the tip point. It may be defined as an angle formed by a straight line connecting 33c.

In the present embodiment, a pair of second portions 33b are configured so that θ is 90 ° or more and less than 180 °, preferably 150 ° or less. As will be described later, a pair of second portions 33b may be configured so that θ is less than 90 °.

Hereinafter, a pair of first portions 33a will be described. In FIGS. 1 and 3, reference numeral L1 extends in the orthogonal direction D1 orthogonal to one outer edge (here, the first upper edge 21) of the bag 10 on which the protruding seal portion 33 is formed, and has a tip point 33c. It represents a straight line that passes through (hereinafter referred to as the center line). Further, in FIG. 1, reference numeral P1 represents a point (hereinafter, referred to as an intermediate point) located on the center line L1 and in the middle of the accommodating portion 15 in the orthogonal direction D1. Further, in FIG. 1, reference numeral L2 represents two straight lines (hereinafter, referred to as inscribed straight lines) that pass through the above-mentioned intermediate point P1 and are in contact with the inner edge of the protruding seal portion 33 at the inner contact P2. The protruding seal portion 33 projects toward the side of the accommodating portion 15 where the intermediate point P1 exists. The pair of first portions 33a are located on the outer edge (here, the first upper edge 21) side of the protruding seal portion 33 with respect to the inner contact P2, and are between the two inscribed straight lines L2. It is a pair of parts located in.

The inner edge of the protruding seal portion 33 is an edge portion of the protruding seal portion 33 that is in contact with the first non-sealing portion 20b. The outer edge of the protruding seal portion 33 is an edge portion located on the opposite side of the inner edge. The outer edge of the protruding seal portion 33 is in contact with the second non-seal portion 20c.

The pair of second portions 33b are located closer to the intermediate point P1 of the accommodating portion 15 than the above-mentioned internal contact P2. Further, the pair of second portions 33b are located between the two inscribed straight lines L2.

The "intermediate point P1" is a point on the center line L1 and, as shown in FIG. 1, an outer edge seal portion 20a (here, the second upper portion) that defines one end of the accommodating portion 15 in the orthogonal direction D1. The distance S1 from the inner edge of the edge seal portion 22a) to the intermediate point P1 and the inner edge of the outer edge seal portion 20a (here, the lower edge seal portion 23a) facing the above-mentioned one end of the accommodating portion 15 and defining the other end of the accommodating portion 15. It is a point where the distance S2 from the intermediate point P1 is equal to that of the distance S2. In the bag 10 in the state before being sealed, the inner edge of the outer edge sealing portion (here, the lower edge sealing portion 23b) may be used as the inner edge of the outer edge sealing portion 20a that defines the intermediate point P1.

In the present embodiment, both the inner edge of the pair of first portions 33a and the inner edge of the pair of second portions 33b extend at least partially linearly. Further, the inner edges of the pair of first portions 33a extend parallel to the orthogonal direction D1 orthogonal to the first upper edge 21. Although not shown, the pair of first portions 33a may be configured to intersect each other when the pair of first portions 33a is virtually extended toward the intermediate point P1 side. In this case, the angle formed by the pair of first portions 33a is smaller than the above-mentioned angle θ formed by the pair of second portions 33b. The angle formed by the pair of first portions 33a is the angle formed by the linear portions of the inner edge of the pair of first portions 33a.

Of the protruding seal portion 33, a portion where the first portion 33a and the second portion 33b are connected (here, a portion of the internal contact P2) and a portion where the pair of second portions 33b are connected, that is, the tip point. 33c may have a curved shape.

Further, the protruding seal portion 33 includes other portions between the first portion 33a and the second portion 33b and between the first portion 33a and the outer edge seal portion 20a (here, the first upper edge seal portion 21a). You may be. For example, when the pair of first portions 33a is limitedly interpreted as a pair of linear portions between the intermediate point P1 and the outer edge seal portion 20a of the protruding seal portion 33, the intermediate point P1 and the outer edge seal Other linear portions and curved portions may be present between the portion 20a and the portion 20a. Similarly, when the pair of second portions 33b is limitedly interpreted as a pair of linear portions connected to the tip point 33c of the protruding seal portion 33, the intermediate point P1 and the second portion 33b There may be other linear or curved portions in between.

In the present embodiment, the above-mentioned intermediate point P1 is located in the middle of the accommodating portion 15 in the orthogonal direction D1 orthogonal to the first upper edge 21 on which the protruding seal portion 33 is formed, and the first upper edge 21 extends. It is also located in the middle of the accommodating portion 15 in the direction. That is, the distance S3 from the inner edge of the outer edge seal portion 20a (here, the first side edge seal portion 24a) that defines one end of the accommodating portion 15 in the direction in which the first upper edge 21 extends to the intermediate point P1 and the above-mentioned accommodating portion 15. The distance S4 from the inner edge of the outer edge seal portion 20a (here, the second side edge seal portion 25a) that faces one end of the housing portion 15 and defines the other end of the accommodating portion 15 to the intermediate point P1 is equal. In other words, the protruding seal portion 33 of the steam release mechanism 30 is provided so that the tip point 33c is located in the middle of the accommodating portion 15 in the direction in which the first upper edge 21 extends. However, the present invention is not limited to this, and the intermediate point P1 may be located closer to the first side edge 24 or closer to the second side edge 25. In other words, the protruding seal portion 33 may be provided so that the tip point 33c is located at a position deviated from the middle of the accommodating portion 15 in the direction in which the first upper edge 21 extends.

In the present embodiment, both the pair of first portions 33a and the pair of second portions 33b are line-symmetric with respect to the center line L1. Although not shown, the pair of the first portion 33a and the pair of the second portion 33a are located between the two inscribed straight lines L2 as long as the pair of the first portion 33a and the pair of the second portion 33b are both located between the two inscribed straight lines L2. 33b does not have to be line symmetric with respect to the center line L1. Further, a shape may be adopted in which the pair of first portions 33a are line-symmetrical, but the pair of second portions 33b are not line-symmetrical. Further, a shape may be adopted in which the pair of second portions 33b are line-symmetrical, but the pair of first portions 33a are not line-symmetrical.

In FIG. 3, reference numeral H1 indicates a distance (here, the distance between the outer edge seal portion 20a (here, the first upper edge seal portion 21a) to which the protruding seal portion 33 is connected and the inner contact P2 in the above-mentioned orthogonal direction D1). Hereinafter, it is also referred to as a first distance). Further, the reference numeral H2 represents a distance (hereinafter, also referred to as a second distance) between the tip point 33c and the internal contact P2 in the orthogonal direction D1. The first distance H1 is preferably 3 mm or more. The second distance H2 is preferably 3 mm or more. The value (= H1 / H2) obtained by dividing the first distance H1 by the second distance H2 is preferably 0.3 or more and 3.0 or less.

When the positions of the pair of inner contacts P2 in the above-mentioned orthogonal direction D1 are different, the above-mentioned first distance H1 sets the distance between the pair of inner contacts P2 and the outer edge seal portion 20a in the above-mentioned orthogonal direction D1, respectively. It may be a value obtained by calculating and averaging them. The same applies to the first distance H2.

[Second non-seal part]
Next, the second non-seal portion 20c will be described. The second non-seal portion 20c communicates with the outside of the bag 10. For example, in the present embodiment, as shown in FIG. 4, a through hole 31 penetrating the first film 11 is formed in the second unsealed portion 20c. Therefore, even when the first upper edge seal portion 21a extending along the first upper edge 21 extends from one end 33x of the protruding seal portion 33 to the other end 33y, the broken portion of the protruding seal portion 33 can be removed. The steam that has passed through and reached the second unsealed portion 20c can escape to the outside of the bag 10. In addition, in this specification, "destruction of a sealing part" means that peeling of a film occurs in a part which was a sealing part.

As shown in FIG. 4, not only in the first film 11, but also in the intermediate film 13, a through hole 31 penetrating the intermediate film 13 may be formed in the second unsealed portion 20c. Further, although not shown, the through hole 31 may be formed only in either the first film 11 or the intermediate film 13.

The second unsealed portion 20c is preferably centered at a portion of the second unsealed portion 20c that is farthest from the first upper edge 21 (hereinafter, also referred to as a tip point of the second unsealed portion 20c). It is formed so as to be located on the line L1. In the present embodiment, the second unsealed portion 20c has a substantially pentagonal contour. Further, the tip point of the second non-seal portion 20c is located at one apex of a substantially pentagon.

(the film)
Next, an example of the layer structure of the first film 11, the second film 12, and the intermediate film 13 will be described with reference to FIG.

As shown in FIG. 5, the first film 11, the second film 12, and the intermediate film 13 include the base material layer 52 and the thermoplastic resin layer 51. In the example shown in FIG. 5, the base material layer 52 constitutes the outer surfaces 11y, 12y, 13y of the films 11, 12, 13 and the thermoplastic resin layer 51 constitutes the inner surfaces of the films 11, 12, 13 respectively. It constitutes 11x, 12x, and 13x. The base material layer 52 may be printed with characters, numbers, symbols, figures, patterns, etc. for indicating product information.

As the material constituting the base material layer 52, for example, polyethylene terephthalate or nylon can be used. The base material layer 52 can ensure high printability on the outer surfaces 11y, 12y, and 13y. Further, the base material layer 52 has high heat resistance at the time of heat welding.
As the material constituting the thermoplastic resin layer 51, for example, polyethylene, polypropylene, or the like can be used.
The thickness of the films 11, 12, and 13 is, for example, in the range of 20 to 250 μm.

Although not shown, the films 11, 12, and 13 may further include an intermediate layer arranged between the base material layer 52 and the thermoplastic resin layer 51. As the intermediate layer, an appropriate one can be selected according to the required performance such as water vapor and other gas barrier properties, light shielding properties, and various mechanical strengths. For example, as an intermediate layer, a vapor-deposited layer of a metal oxide such as aluminum oxide or an inorganic oxide such as silicon oxide may be provided. In addition, as an intermediate layer, a resin layer having a gas barrier property such as an ethylene-vinyl alcohol copolymer (EVOH), a polyvinylidene chloride resin (PVDC), or an aromatic polyamide such as nylon MXD6 may be provided. By providing such an intermediate layer, it is possible to prevent oxygen and water vapor from entering the inside of the bag 10. Further, a stretched nylon film may be provided as an intermediate layer. In this case, the puncture resistance of the bag 10 can be improved.

Needless to say, the layer configurations of the first film 11, the second film 12, and the intermediate film 13 are not limited to those described above.

Although not shown, the films 11, 12, and 13 may be provided with easy-opening means for breaking the bag 10 and facilitating opening the bag 10. For example, the outer edge seal portion 20a along the outer edge of the bag 10, such as the first side edge seal portion 24a and the second side edge seal portion 25a, may be formed with a notch serving as a starting point of fracture. Further, a half-cut line formed by laser processing, a cutter, or the like may be provided as an easy-opening means in the portion serving as a path when the bag 10 is broken. Further, the stretched film may be included in the films 11, 12, and 13, so that the stretching direction of the stretched film and the breaking direction of the bag 10 are made to coincide with each other. Normally, the stretching direction of the film coincides with the transport direction T of the film in the method for manufacturing the bag 10 described later. Further, the bag 10 may be printed to indicate the position to be opened to the user of the bag 10.
Further, instead of the notch, a notch or a group of scars may be formed on the outer edge sealing portion 20a along the outer edge of the bag 10. The scar group may include, for example, a plurality of through holes formed to penetrate the films 11, 12, and 13. Alternatively, the scar group may include a plurality of holes formed in the films 11, 12, 13 so as not to penetrate the films 11, 12, 13.

(Manufacturing method of bag)
Next, a method of manufacturing the bag 10 according to the present embodiment will be described.

[Production process of original film]
First, an example of a step of producing the original fabric of the laminated film which is the basis of each of the films 11, 12, and 13 will be described. First, the raw fabric of one base material layer 52 is prepared. Here, the raw fabric means a rolled film that has been wound up. Next, a print display may be applied to one surface of the film of the base material layer 52 while continuously transporting the long base material layer 52 unwound from one original fabric. For example, the print display for the first film 11 is repeatedly applied to one side of the film of the long base layer 52, and the other side of the film of the long base layer 52 is repeatedly applied. The print display for the second film 12 may be repeatedly applied. Next, a thermoplastic resin layer 51 is laminated on the film of the long base material layer 52 by using a dry laminating method or a melt extrusion laminating method to prepare a long laminated film. In this way, the raw fabric of the laminated film for each of the films 11, 12 and 13 is obtained. It should be noted that the print display may be applied to the laminated film instead of being applied in the state of the film of the base material layer.

[Film preparation process]
Next, as shown in FIG. 6A, the original fabric of the laminated film is appropriately cut, and the first film 11, the second film 12, and the first film 11 are folded along the folded-back portion 13c. An intermediate film 13 arranged between the second film 12 and the second film 12 is prepared. When the steam release mechanism 30 includes the through hole 31 as described above, the through hole 31 may be formed in the first film 11 at this stage.

After that, a part of the inner surface 11x of the first film 11 and a part of the inner surface 12x of the second film 12 face each other, the inner surface 13x of the intermediate film 13 and the inner surface 11x of the first film 11 face each other, and the intermediate film 13 The films 11, 12, and 13 are overlapped so that the inner surface 13x of the film 12 and the inner surface 12x of the second film 12 face each other.

Note that FIG. 6A shows a state in which the films 11, 12, and 13 are separated from each other, but the present invention is not limited to this. Although not shown, by appropriately folding one film, between the first film 11 and the second film 12 and the first film 11 and the second film 12 in a state of being folded along the folded portion 13c. It is also possible to prepare an intermediate film 13 which is arranged in.

Further, although not shown, the films 11, 12, and 13 may be laminated on each other in the state of a long film to which a large number of bags 10 are allocated. In this case, the bags 10 are formed by joining the films 11, 12, 13 to each other to form the outer edge sealing portion 20a, and then cutting the elongated films 11, 12, 13 along the shape of the bag 10. Is obtained.

[Heat welding process]
After that, the first film 11 and the second film 12 are heated from the outer surfaces 11y and 12y sides along the outer edge to heat a part of the inner surface 11x of the first film 11 and a part of the inner surface 12x of the second film 12. Welding is performed to heat-weld the inner surface 13x of the intermediate film 13 and the inner surface 11x of the first film 11, and heat-weld the inner surface 13x of the intermediate film 13 and the inner surface 12x of the second film 12. As a result, as shown in FIG. 6B, a seal portion such as the outer edge seal portion 20a and the protruding seal portion 33 is formed. As a result, the non-seal portions 20b and 20c surrounded by the seal portions are defined. In the heat welding step, as shown in FIG. 6B, a steam release mechanism 30 is provided on one outer edge of the first film 11 or one outer edge of the second film 12 (here, the first upper edge 21 of the first film 11). It will be carried out. Further, the heat welding step is carried out at this stage so as not to form a seal portion on the lower edges 23 of the films 11 and 12.

[Cutting process]
Next, as shown in FIG. 6C, the films 11, 12, and 13 bonded to each other by the sealing portion are cut along the contour of the bag 10. In this way, the bag 10 provided with the vapor release mechanism 30 formed on the first upper edge 21 is manufactured. At this time, the first upper edge 21 may be formed by cutting the first film 11 and the intermediate film 13.

[Filling process]
Next, the contents are filled in the bag 10 through the lower edge seal scheduled portion 23b (filling port) of the lower edge 23. After that, the inner surface 11x of the first film 11 and the inner surface 12x of the second film 12 are heat-welded along the lower edge 23 to form the lower edge sealing portion 23a. In this way, as shown in FIG. 6D, it is possible to obtain a bag 10 in which the contents are sealed in the accommodating portion 15.

(How to heat the contents)
Next, an example of a method of heating the contents stored in the storage portion 15 of the bag 10 will be described.

First, the bag 10 in which the second film 12 is located below the first film 11 is placed inside the microwave oven. Next, the contents are heated using a microwave oven. As a result, the temperature of the contents rises, and along with this, the water contained in the contents evaporates and the pressure of the accommodating portion 15 increases. In FIG. 7A, as the pressure of the accommodating portion 15 increases, the expanding portion 40 in which the first film 11 constituting the accommodating portion 15 swells upward from the first film 11 forming the outer edge seal portion 20a is formed in the accommodating portion 15. It shows how it is formed in. When the pressure of the accommodating portion 15 increases, the second film 12 constituting the accommodating portion 15 swells downward from the second film 12 constituting the outer edge sealing portion 20a.

Note that FIG. 7A shows an example in which the wing portion 17 composed of the first film 11 and the intermediate film 13 is folded back toward the second upper edge 22 when the contents are heated. The state of the bag 10 at the time of use is not limited to this. For example, the state of the bag 10 when heating the contents may be a state in which the wing portion 17 is folded back toward the lower edge 23, or a state in which the wing portion 17 is bent upward. There may be.

When the pressure of the accommodating portion 15 becomes higher with heating, the expanding portion 40 further expands and reaches the inner edge of the second portion 33b of the protruding seal portion 33 as shown in FIG. 7B. As a result, as shown in FIG. 7B, a force F that tries to break the protruding seal portion 33 by peeling the first film 11 from the intermediate film 13 acts on the second portion 33b of the protruding seal portion 33. FIG. 7C is a diagram showing a state in which the expansion portion 40 is further expanded and reaches the inner edge of the first portion 33a of the protruding seal portion 33.

Here, according to the present embodiment, as described above, the protruding seal portion 33 is configured such that the angle θ formed by the pair of second portions 33b at the tip point 33c is less than 180 °. Therefore, the force generated by the expansion portion 40 can be first concentrated on the tip point 33c. Therefore, at the tip point 33c, the first film 11 can be easily peeled off from the intermediate film 13 to break the protruding seal portion 33. That is, the starting point of film peeling can be easily created at the tip point 33c.

Further, in the present embodiment, the pair of second portions 33b of the protruding seal portions 33 are located closer to the intermediate point P1 of the accommodating portion 15 than the internal contact P2. Therefore, the force for peeling the first film 11 from the intermediate film 13 acts on the entire area of the pair of second portions 33b. On the other hand, when the pair of first portions 33a of the protruding seal portion 33 draw two inscribed straight lines L2 that are in contact with the inner edge of the protruding seal portion 33 at the inner contact P2 from the above-mentioned intermediate point P1 of the accommodating portion 15. It is located on the first upper edge 21 side of the inner contact P2. In this case, the force generated by the expanding portion 40 expanding to the outer edge of the bag 10 acts more strongly on the second portion 33b than on the first portion 33a, as shown in FIG. 7C. Therefore, the force acting on the protruding seal portion 33 between the time when the expanding expansion portion 40 reaches the tip point 33c of the protruding seal portion 33 and the time when it reaches the inner edge of the first upper edge sealing portion 21a is applied to the second. It can be concentrated on the portion 33b. Therefore, as shown in FIG. 7D, the destruction of the protruding seal portion 33 can be easily promoted at the portion of the second portion 33b.

When the portion where the protruding seal portion 33 is broken reaches the second non-sealing portion 20c, the steam of the accommodating portion 15 passes through the broken portion of the protruding seal portion 33, the second non-sealing portion 20c, and the through hole 31. And exit to the outside. As a result, the pressure inside the accommodating portion 15 can be reduced to prevent the bag 10 from bursting.

Further, as described above, the force acting on the first portion 33a due to the expansion portion 40 is weaker than the force acting on the second portion 33b. Therefore, according to the present embodiment, it is possible to prevent the destruction of the protruding seal portion 33 from proceeding in the first portion 33a. As a result, it is possible to prevent the protrusion seal portion 33 from being broken to the outer edge of the bag 10 and the contents from leaking from the outer edge of the bag 10. Further, according to the present embodiment, the force acting on the protruding seal portion 33 can be concentrated on the second portion 33b to destroy the second portion 33b, so that the first side edge seal portion 24a and the second side can be destroyed. It is possible to prevent the outer edge seal portion 20a such as the edge seal portion 25a from being destroyed before the protruding seal portion 33. Therefore, it is possible to prevent the contents from leaking from the outer edge of the bag 10.

Further, according to the present embodiment, since the protruding seal portion 33 includes the pair of first portions 33a, the protruding seal portion 33 includes the pair of first portions 33a, as compared with the case where the protruding seal portion 33 does not include the pair of first portions 33a. The distance from the tip point 33c to the intermediate point P1 of the accommodating portion 15 can be shortened. As a result, the force acting on the tip point 33c due to the expansion portion 40 can be increased. Therefore, at the tip point 33c, the first film 11 can be more easily peeled from the intermediate film 13 to break the protruding seal portion 33.

It is possible to make various changes to the above-described embodiment. Hereinafter, a modified example will be described with reference to the drawings as necessary. In the following description and the drawings used in the following description, the same codes as those used for the corresponding parts in the above-described embodiment will be used for the parts that can be configured in the same manner as in the above-described embodiment. Duplicate explanations will be omitted. Further, when it is clear that the action and effect obtained in the above-described embodiment can be obtained in the modified example, the description thereof may be omitted.

(Modification example of steam release mechanism)
Hereinafter, some modifications of the shape of the steam release mechanism 30 will be given. 8 to 12 are diagrams showing modified examples of the steam release mechanism 30, respectively.

[First modification]
In the above-described embodiment, an example is shown in which the pair of second portions 33b of the protruding seal portion 33 extend linearly. However, the present invention is not limited to this, and the pair of second portions 33b may include a curved portion. In this case, preferably, as shown in FIG. 8, the pair of second portions 33b has a convex shape that is convex from the inner edge side to the outer edge side thereof. As a result, as shown in FIG. 8, the angle θ formed by the pair of second portions 33b at the tip point 33c can be made smaller, for example, less than 90 °. By configuring the second portion 33b in this way, the force caused by the expansion portion 40 can be more concentrated on the tip point 33c.

[Second modification]
As shown in FIG. 9, even when the pair of second portions 33b extend linearly, it is possible to make the angle θ formed by the pair of second portions 33b at the tip point 33c less than 90 °. be.

[Third variant]
Further, in the above-described embodiment, an example is shown in which the contour of the protruding seal portion 33 second non-seal portion 20c is substantially pentagonal. However, the contour of the second unsealed portion 20c is not particularly limited as long as the steam can be appropriately discharged to the outside of the bag 10 in the second unsealed portion 20c. For example, as shown in FIG. 10, the contour of the second unsealed portion 20c may be circular.

[Fourth variant]
Further, in the above-described embodiment, an example is shown in which the circular through hole 31 is formed in the second non-sealing portion 20c of the steam release mechanism 30. However, the shape of the through hole 31 is not particularly limited as long as the second non-sealing portion 20c can communicate with the outside of the bag 10 to remove steam. For example, as shown in FIG. 11, a slit-shaped through hole 31 may be formed in the second unsealed portion 20c. The slit-shaped through hole 31 is formed, for example, by making a notch in the first film 11 or the intermediate film 13.

[Fifth variant]
Further, in the above-described embodiment, the first upper edge sealing portion 21a includes a portion extending from one end 33x of the protruding sealing portion 33 to the other end 33y, and the protruding sealing portion 33 and the first upper edge sealing portion 33. An example of forming a through hole 31 in the second unsealed portion 20c surrounded by 21a is shown. However, as long as the steam of the accommodating portion 15 can be released to the outside of the bag 10, the configuration of the steam release mechanism 30 in the portion outside the outer edge of the protruding seal portion 33 is not particularly limited. For example, as shown in FIG. 12, the second non-seal portion 20c in contact with the outer edge of the protruding seal portion 33 may be formed so as to be in contact with the first upper edge 21. That is, the first upper edge seal portion 21a does not have to include a portion extending from one end 33x of the protruding seal portion 33 to the other end 33y. In this case, even if the through hole is not formed in the second non-seal portion 20c, the steam that reaches the second non-seal portion 20c through the destroyed portion of the protruding seal portion 33 is transmitted from the first upper edge 21. It can be pulled out of the bag 10.

(Modified example of bag)
Hereinafter, some modifications of the configuration of the bag 10 will be given. 13 and 14 are diagrams showing a modified example of the bag 10, respectively.

(First modification)
In the above-described embodiment, the bag 10 includes an intermediate film 13 arranged between the first film 11 and the second film 12 in a folded state, and the protruding seal portion 33 is the first film 11. An example is shown in which the intermediate film 13 is connected to the outer edge sealing portion 20a to which the intermediate film 13 is bonded. However, the configuration of the bag 10 is not particularly limited as long as the steam release mechanism 30 including the protruding seal portion 33 connected to the outer edge seal portion 20a can be formed. For example, as shown in FIG. 13, the bag 10 may be a so-called flat pouch containing the first film 11 and the second film 12 and not including the intermediate film 13. In this case, the protruding seal portion 33 is connected to the outer edge seal portion 20a formed by combining the first film 11 and the second film 12.

Further, although not shown, when the bag 10 includes an intermediate film 13 arranged between the first film 11 and the second film 12 in a folded state, the protruding seal portion 33 is the first film 11. And the second film 12 may be connected to the outer edge sealing portion 20a (for example, the first upper edge sealing portion 21a) to which the second film 12 is bonded. For example, in the so-called bottom gusset type bag 10, a protruding seal portion 33 connected to the upper edge seal portion of the bag 10 may be formed.

(Second modification)
Further, in the above-described embodiment, an example of forming the protruding seal portion 33 connected to the first upper edge sealing portion 21a of the bag 10 is shown, but the position where the protruding seal portion 33 is provided is particularly limited. There is no. For example, as shown in FIG. 14, a protruding seal portion 33 connected to the first side edge seal portion 24a of the bag 10 may be formed.

Although some modifications to the above-described embodiments have been described, it is naturally possible to apply a plurality of modifications in combination as appropriate.

Next, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the description of the following Examples as long as the gist of the present invention is not exceeded.

(Example)
A bag 10 provided with a steam release mechanism 30 having a protruding seal portion 33 including a pair of first portions 33a, a pair of second portions 33b, and a tip point 33c shown in FIG. 1 was prepared. The angle θ formed by the pair of second portions 33b at the tip point 33c was set to 120 °. The first distance H1 and the second distance H2 shown in FIG. 3 were set to 4 mm and 6 mm, respectively. Further, the above-mentioned distances S1, distance S2, distance S3 and distance S4 calculated from the intermediate point P1 were 76 mm, 76 mm, 62 mm and 62 mm, respectively.

Next, the accommodating portion 15 of the bag 10 was filled with 100 g of water, and the water was heated in a microwave oven having an output of 600 W. As a result, in all of the samples of the 10 bags 10, the film was peeled off at the tip point 33c of the protruding seal portion 33 and the pair of second portions 33b, and no peeling of the film was observed at the outer edge sealing portion 20a. Then, the steam properly escaped to the outside of the bag 10 through the unsealed portion 20c, and the water did not leak to the outside of the bag 10. Further, in all of the samples, the peeling of the film at the protruding seal portion 33 did not reach the first upper edge sealing portion 21a to which the protruding seal portion 33 was connected.

(Comparison example)
In FIG. 1, a bag provided with a steam release mechanism was prepared in the same manner as in FIG. 1 except that the protruding seal portion 30 was changed to the protruding seal portion 133 shown in FIG. In the protruding seal portion 133 shown in FIG. 15, a pair of linear second portions 33b connected at the tip point 33c extend to the first upper edge seal portion 21a. The angle formed by the pair of second portions 33b at the tip point 33c was 90 °.

In the same manner as in the case of the example, 100 g of water was filled in the accommodating portion of the bag provided with the steam release mechanism including the protruding seal portion 133 shown in FIG. 15, and the water was heated in a microwave oven having an output of 600 W. As a result, in all of the 10 bag samples, the film peeling that occurred at the protruding seal portion 133 proceeded to the first side edge seal portion 24a or the second side edge seal portion 25a. Therefore, water leaked out from the first side edge 24 or the second side edge 25.

10 Bag 11 1st film 12 2nd film 13 Intermediate film 15 Accommodating part 17 Wing part 20a Sealing part 20b 1st non-sealing part 20c 2nd non-sealing part 21 1st upper edge 21a 1st upper edge Sealing part 22 2nd upper Edge 22a Second upper edge seal portion 23 Lower edge 23a Lower edge seal portion 23b Lower edge seal planned portion 24 First side edge 24a First side edge seal portion 25 Second side edge 25a Second side edge seal portion 30 Steam release mechanism 31 Through hole 33 Protruding seal portion 33a First portion 33b Second portion 33c Tip point 40 Expansion portion L1 Center line L2 Inscribed straight line P1 Intermediate point P2 Internal contact

Claims (7)

A bag that contains a film and contains the contents.
A seal portion in which the films facing each other are bonded to each other,
A non-sealing portion in which the films facing each other are not bonded to each other is provided.
The seal portion has an outer edge seal portion extending along the outer edge of the bag and a protruding seal portion connected to the outer edge seal portion .
Before SL unsealed portion in contact with the inner edge of the protruding sealing portion, a first non-sealing portion defining a receiving portion to which the contents are accommodated, in contact with the outer edge of the protruding sealing portion, the outside of the bag Has a second unsealed portion that communicates with
The film includes a first film and a second film, and an intermediate film arranged between the first film and the second film in a folded state.
The outer edge of the bag includes a first upper edge where one end of the intermediate film and one end of the first film are located, and a second upper edge where the other end of the intermediate film and one end of the second film are located. Includes the other end of the first film and the lower edge where the other end of the second film is located.
The distance from the first upper edge to the lower edge is shorter than the distance from the second upper edge to the lower edge.
The protruding seal portion is connected to the first upper edge seal portion of the outer edge seal portion, which is formed by bonding the first film and the intermediate film along the first upper edge.
Of the protruding seal portions, the portion farthest from the first upper edge is referred to as a tip point, and a straight line extending in an orthogonal direction orthogonal to the first upper edge and passing through the tip point is referred to as a center line. When a point located on the center line and located in the middle of the accommodating portion in the orthogonal direction is referred to as an intermediate point, the protruding seal portion projects toward the intermediate point.
Wherein the second film along the second upper edge and the inner edge of the second upper seal portion intermediate film is coupled to said intermediate point, a distance in the orthogonal direction is along the lower edge Equal to the distance in the orthogonal direction from the inner edge of the lower edge seal portion formed by the first film and the second film to the intermediate point.
The protruding seal portion is located closer to the first upper edge than the inner contact when two inscribed straight lines that pass through the intermediate point and are in contact with the inner edge of the protruding seal portion at the inner contact are drawn. A pair of first portions located between the two inscribed straight lines and a pair of first portions connected to the pair of first portions at the internal contact, located closer to the intermediate point side of the internal contact and the two. It has a pair of second portions located between the inscribed straight lines and connected at the tip point, including a pair of second portions including a linearly extending inner edge.
The angle formed by the extending directions of the inner edges of the pair of second portions is 90 ° or more and less than 180 °.
The center point is position on the extension of the inner edge, a bag. The bag according to claim 1, wherein the distance between the first upper edge and the inner contact point in the orthogonal direction is 3 mm or more. The bag according to claim 1 or 2, wherein the distance between the tip point and the internal contact in the orthogonal direction is 3 mm or more. When the distance between the first upper edge and the inner contact point in the orthogonal direction is referred to as a first distance, and the distance between the tip point and the inner contact point in the orthogonal direction is referred to as a second distance. The bag according to any one of claims 1 to 3, wherein the value obtained by dividing the first distance by the second distance is 0.3 or more and 3.0 or less. The bag according to any one of claims 1 to 4, wherein both the pair of first portions and the pair of second portions are line-symmetrical with respect to the center line. The first upper edge sealing portion is formed along the entire area of the first upper edge.
The second non-seal portion is surrounded by the first upper edge seal portion and the protruding seal portion.
The bag according to any one of claims 1 to 4, wherein the bag is located in the second non-seal portion and has a through hole for penetrating the film. The bag according to any one of claims 1 to 4, wherein the second non-seal portion extends so as to be in contact with the first upper edge.

Images