JP2017128366A - bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag provided with a steam release mechanism capable of appropriately releasing steam in a housing portion to the outside. A bag includes a sealing portion in which opposing films are bonded to each other, and a non-sealing portion in which opposing films are not bonded to each other. The non-seal portion has a first non-seal portion that defines a storage portion in which the contents are housed. 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 and projecting toward the midpoint of the accommodating portion. The protruding seal portion is located on the outer edge side of the bag and inside the two when two inscribed straight lines that pass through the midpoint of the accommodating portion and are in contact with the inner edge of the protruding seal portion at the inner contact are drawn. A pair of first parts located between the tangent lines and a pair of second parts located between the two inscribed straight lines located on the midpoint side of the internal contact and connected at the tip point. including. [Selection diagram] Fig. 1

Description

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

  2. Description of the Related Art Conventionally, many cooked or semi-cooked liquids, viscous bodies, or mixed contents of liquid and solid are filled and sealed in bags made of plastic films. The contents are, for example, cooked foods such as curry, stew, and soup. In the bag, the non-seal part to which the films are not joined defines an accommodation part in which the contents are accommodated. Moreover, the seal | sticker part with which films are couple | bonded has sealed the accommodating part. A microwave oven is widely used as a means for cooking the contents.

  By the way, when the contents in a bag are heated using a microwave oven, the water | moisture content contained in a content evaporates with heating and the pressure of the accommodating part of a bag increases. When the pressure in the bag storage portion 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 communicating with the housing portion and releasing the steam in the housing portion to the outside when the pressure in the bag housing portion exceeds a predetermined value. For example, Patent Document 1 discloses that a protruding seal portion that protrudes in a V shape inward from a seal portion that extends along the outer edge of the bag is formed as a part of the seal portion as a steam release mechanism.

Japanese Patent Laid-Open No. 2002-80072

  As a result of intensive studies by the present inventors, in the bag disclosed in Patent Document 1, steam may not be able to escape properly from the V-shaped projecting seal portion. For example, in a bag provided with a V-shaped projecting seal portion projecting inward from the seal portion at the upper edge of the bag, when the pressure in the storage portion increases, the seal portion at the side edge of the bag or its periphery is destroyed and the bag In some cases, the contents leaked from the side edges of the.

  The present invention has been made in consideration of such points, and an object of the present invention is to provide a bag provided with a steam release mechanism that can appropriately release the steam in the housing portion to the outside.

  The present invention is a bag that contains a film and contains contents, and includes a seal portion in which the opposing films are coupled to each other, and a non-seal portion in which the opposing films are not coupled to each other, The non-seal portion includes a first non-seal portion that defines a storage portion in which the contents are stored, and the seal portion includes an outer edge seal portion that extends along an outer edge of the bag, and the outer edge seal portion. A projecting seal portion connected to the outer periphery of the projecting seal portion, and the outer edge of the projecting seal portion communicates with the outside of the bag, and of the projecting seal portion, the projecting seal portion is connected to the outer edge seal. A point that is farthest from one outer edge of the bag along the portion is referred to as a tip point, and a straight line that extends in an orthogonal direction perpendicular to the one outer edge of the bag and passes through the tip point is referred to as a center line. Located on the centerline When the point located in the middle of the accommodating portion in the orthogonal direction is called an intermediate point, the protruding seal portion protrudes toward the intermediate point, and the protruding seal portion passes through the intermediate point and When two inscribed straight lines that are in contact with the inner contact of the projecting seal portion by the inner contact are drawn, a pair of second straight lines that are located on the one outer edge side with respect to the inner contact and between the two inscribed straight lines. And a pair of second portions that are located on the intermediate point side of the inner contact and located between the two inscribed straight lines and connected at the tip point. An angle formed by the second portion at the tip point is a bag of less than 180 °.

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

  Preferably, a 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. When the distance between and the second distance is referred to as a second distance, a 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 axisymmetric 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 toward the outer edge side.

  In the bag of the present invention, the film includes a first film and a second film, and an intermediate film disposed 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 seal portion formed by combining the first film and the intermediate film in the outer edge seal portion.

  According to the present invention, the projecting seal portion projecting toward the non-seal portion defining the housing portion draws two inscribed straight lines that are in contact with the inner edge of the projecting seal portion from the intermediate point of the housing portion at the inner contact. In some cases, it includes a pair of first portions located on the outer edge side of the bag with respect to the inner contact and located between two inscribed straight lines. In this case, the force generated by increasing the pressure in the housing portion is unlikely to act on the pair of first portions. For this reason, it can suppress that films peel in a pair of 1st part. Thereby, it can suppress that peeling of films reaches even the outer edge seal part connected to the protrusion seal part. Therefore, it can suppress that the content leaks out of a bag.

It is a front view which shows the bag by one Embodiment of this invention. It is sectional drawing which shows the case where the bag shown in FIG. 1 is seen along II-II line. It is a figure which expands and shows the vapor | steam escape mechanism of the bag shown in FIG. It is sectional drawing which shows the case where the vapor escape mechanism shown in FIG. 3 is seen along the IV-IV line. It is sectional drawing which shows an example of the laminated constitution of a film. It is a figure which shows the process of preparing the film which comprises a bag. It is a figure which shows the process of couple | bonding films and forming a seal part. It is a figure which shows the process of cut | disconnecting a film along the outline of a bag. It is a figure which shows the process of sealing the bag with which the content was filled. It is a figure which shows a mode that the pressure of the accommodating part of a bag increases and an expansion part is formed. It is a figure explaining the force which acts on a vapor | steam escape mechanism resulting from an expansion part. It is a figure explaining the force which acts on a vapor | steam escape mechanism resulting from an expansion part. It is a figure which shows a mode that a part of protrusion seal | sticker part of a steam escape mechanism is destroyed. It is a figure which shows the modification of a steam escape mechanism. It is a figure which shows the modification of a steam escape mechanism. It is a figure which shows the modification of a steam escape mechanism. It is a figure which shows the modification of a steam escape mechanism. It is a figure which shows the modification of a steam escape 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 vapor | steam escape 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, for the sake of illustration and ease of understanding, the scale, vertical and horizontal dimensional ratios, and the like may be appropriately changed and exaggerated from those of the actual product.

  In addition, as used in this specification, the shape and geometric conditions and the degree thereof are specified, for example, terms such as “parallel”, “orthogonal”, “identical”, length and angle values, etc. are strictly Without being bound by meaning, it should be interpreted including the extent to which similar functions can be expected.

  FIG. 1 is a front view showing a bag 10 according to the present embodiment. Moreover, FIG. 2 is sectional drawing which shows the case where the bag 10 shown in FIG. 1 is seen along a II-II line. The bag 10 includes a storage unit 15 that stores the contents. In addition, in FIG.1 and FIG.2, the bag 10 of the state before being filled with the content is shown.

  As shown in FIG. 1, the bag 10 according to the present embodiment includes a steam escape mechanism 30 for escaping steam generated when the contents contained in the bag 10 are heated to the outside. The steam escape mechanism 30 allows the inside and the outside of the bag 10 to communicate with each other when the steam pressure reaches a predetermined value or more to escape the steam, and to suppress the steam escape from a place other than the steam escape mechanism 30. ,It is configured. Hereinafter, the configuration of the bag 10 will be described.

The bag 10 is disposed between the first film 11 and the second film 12 in a state of being folded along the folded portion 13c, the second film 12 facing the first film 11, and the second film 12. Intermediate film 13. FIG. 1 shows a bag 10 as viewed from the first film 11 side.

  Note that the terms “first film”, “second film”, and “intermediate film” described above are merely what defines the film constituting the bag 10 according to the positional relationship of the outer surface of the bag 10. The method of providing a film when manufacturing 10 is not limited by the above terminology. For example, the bag 10 may be manufactured using a single film in which the first film 11, the second film 12, and the intermediate film 13 are continuously provided, and the first film 11 and the intermediate film 13 are continuously provided. It may be manufactured using a total of two films, one film and one second film 12, and a total of three films including 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 stored in the bag 10 are stored in a microwave oven in a state where the bag 10 is supported or placed so that the second film 12 is positioned below the first film 11. The use form that it is heated by etc. is mainly assumed. However, the usage form 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 liquid, mucilage, or a mixture of liquid and solid, for example, cooked food such as curry, stew, and soup. Moreover, what can be heated with a microwave oven etc. besides the food may be accommodated in the bag 10 as the contents.

  As shown in FIG. 1, the outer edge of the bag 10 includes a first upper edge 21 and a second upper edge 22, a lower edge 23 that faces the first upper edge 21 and the second upper edge 22, and a first that faces each other. 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 constituted by the first film 11 and the intermediate film 13. The second upper edge 22 is an outer edge constituted by the second film 12 and the intermediate film 13. In FIG. 1 and FIG. 2, there is an example in which the wing portion 17 configured by the first film 11 and the intermediate film 13 is folded 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, it is not restricted to this, The wing part 17 may be return | folded toward the lower edge 23, and may be bent upwards. However, an inscribed straight line L2 and a 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 with the first upper edge 21 being one end and the second upper edge 22 being 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.

  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, the specific configuration of the outer edge of the bag 10 is not particularly limited as long as the bag 10 includes at least one linear outer edge on which a vapor escape mechanism 30 described later is formed.

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

  The seal portion includes an outer edge seal portion 20 a that extends along the outer edge of the bag 10 and a protruding seal portion 33 that constitutes the vapor escape mechanism 30. The non-seal part includes a first non-seal part 20b that defines a storage part 15 in which contents are stored, and a second non-seal part through which steam passes when the steam generated in the storage part 15 is released to the outside of the bag 10. 20c. The protruding seal portion 33 will be described in detail later.

  The seal portion is formed by joining any two inner surfaces among 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 11 x of the first film 11 and the inner surface 13 x of the intermediate film 13 along the first upper edge 21. It includes a seal portion 21 a and a second upper edge seal portion 22 a described later formed by joining the inner surface 12 x of the second film 12 and the inner surface 13 x of the intermediate film 13 along the second upper edge 22.

  As long as the accommodating part 15 can be sealed from the outside, the method for forming the sealing part is not particularly limited. For example, the sealing portion may be formed by melting layers constituting the inner surfaces of the films 11, 12, and 13 by heating and welding the inner surfaces of the films 11, 12, and 13, respectively. Or you may form a seal | sticker part by adhere | attaching the inner surfaces of the films 11, 12, and 13 using an adhesive agent.

  As shown in FIG. 1, the outer edge seal portion 20 a includes a first upper edge seal portion 21 a formed along the first upper edge 21 and a second upper edge seal portion 22 a formed along the second upper edge 22. , A first side edge seal portion 24 a formed along the first side edge 24, and a second side edge seal portion 25 a formed along the second side edge 25. In addition, as will be described later, after filling the container 15 with the lower edge 23 as a filling port, a lower edge seal portion is formed along the lower edge 23 to seal the container 15. In FIG. 1, an inner edge of a portion that will later become a lower edge seal portion is indicated by a one-dot chain line. In the following description, a portion that will later become a lower edge seal portion is also referred to as a lower edge seal scheduled portion 23b.

(Vapor escape 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 escape mechanism 30 shown in FIG. FIG. 4 is a cross-sectional view showing a case where the vapor escape mechanism 30 shown in FIG. 3 is viewed along line IV-IV.

  The steam escape mechanism 30 is configured by giving a part of the seal portion a shape that is easily destroyed as the pressure in the housing portion 15 increases. Specifically, the steam escape mechanism 30 includes the above-described protruding seal part 33 and the second non-seal part 20c. The first non-seal portion 20 b 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 in the accommodating portion 15 increases, a part of the protruding seal portion 33 is destroyed, and the steam in the accommodating portion 15 passes outside through the broken portion of the protruding seal portion 33 and the second non-seal portion 20c.

(Protruding seal)
Hereinafter, the configuration of the protruding seal portion 33 will be described. The projecting 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 housing portion 15. It is the part which was done. In the present embodiment, the projecting seal portion 33 is connected to a first upper edge seal portion 21 a extending along the first upper edge 21.

  As shown in FIG. 3, the projecting 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 outline. The tip point 33c is one outer edge (here, the first upper edge) of the bag 10 along the outer edge seal part 20a (here, the first upper edge seal part 21a) to which the protruding seal part 33 is connected. This is the place farthest from the edge 21). The pair of second portions 33 b are a pair of portions connected at the tip point 33 c in the protruding seal portion 33. In FIG. 3, the angle formed by the pair of second portions 33b at the tip point 33c is indicated by the symbol 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 edges of the pair of second portions 33b do not include a straight portion, the angle θ is a 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, the pair of second portions 33b is configured so that θ is 90 ° or more and less than 180 °, preferably 150 ° or less. As will be described later, the pair of second portions 33b may be configured such that θ is less than 90 °.

  Hereinafter, the pair of first portions 33a will be described. 1 and 3, reference numeral L <b> 1 extends in the orthogonal direction D <b> 1 orthogonal to one outer edge (here, the first upper edge 21) of the bag 10 in which the protruding seal portion 33 is formed, and the tip point 33 c is defined. A straight line passing through (hereinafter referred to as a center line) is shown. In FIG. 1, the symbol P <b> 1 represents a point (hereinafter referred to as an intermediate point) located on the center line L <b> 1 and located in the middle of the accommodating portion 15 in the orthogonal direction D <b> 1. In FIG. 1, reference numeral L <b> 2 represents two straight lines (hereinafter referred to as inscribed straight lines) that pass through the above-described intermediate point P <b> 1 and are in contact with the inner edge of the projecting seal portion 33 at the inner contact P <b> 2. The protruding seal portion 33 protrudes toward the side where the intermediate point P1 exists in the accommodating portion 15. And a pair of 1st part 33a is located in the above-mentioned one outer edge (here 1st upper edge 21) side rather than the inner contact P2 among the protrusion seal parts 33, and between two inscribed straight lines L2. It is a pair of part 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-seal portion 20b. Further, the outer edge of the projecting seal portion 33 is an edge located on the opposite side of the inner edge. The outer edge of the protruding seal part 33 is in contact with the second non-seal part 20c.

  The pair of second portions 33b are located closer to the intermediate point P1 side of the accommodating portion 15 than the above-described inner contact P2. Further, the pair of second portions 33b is 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, the outer edge seal portion 20a (here, the second upper point) that defines one end of the accommodating portion 15 in the orthogonal direction D1. 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) that faces the above-mentioned one end of the storage portion 15 and defines the other end of the storage portion 15 The distance S2 from the center point P1 to the intermediate point P1 is equal. In the bag 10 before being sealed, the inner edge of the outer edge seal planned portion (here, the lower edge seal planned portion 23b) may be used as the inner edge of the outer edge seal portion 20a that defines the intermediate point P1.

  In the present embodiment, the inner edges of the pair of first portions 33a and the inner edges of the pair of second portions 33b both extend at least partially linearly. Further, the inner edges of the pair of first portions 33 a extend in parallel to the orthogonal direction D <b> 1 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 to the intermediate point P1 side. In this case, the angle formed by the pair of first portions 33a is smaller than the above-described angle θ formed by the pair of second portions 33b. The angle formed by the pair of first portions 33a is an angle formed by the linear portions of the inner edges 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, the portion of the inner contact P2), a portion where the pair of second portions 33b are connected, that is, a 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 go out. 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 or curved portions may exist between the portion 20a. Similarly, when the pair of second parts 33b is limitedly interpreted as a pair of linear parts connected to the tip point 33c of the protruding seal part 33, the intermediate point P1 and the second part 33b There may be other linear portions or curved portions in between.

  In the present embodiment, the above-described 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 where the protruding seal portion 33 is formed, and the first upper edge 21 extends. It is also located in the middle of the accommodating part 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 of the 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) defining the other end of the housing portion 15 to the other end of the housing portion 15 is equal to the intermediate point P1. In other words, the protruding seal portion 33 of the steam escape 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 P <b> 1 may be located closer to the first side edge 24 or may be located closer to the second side edge 25. In other words, the protruding seal portion 33 may be provided such that the tip point 33c is located at a position shifted from the middle of the accommodating portion 15 in the direction in which the first upper edge 21 extends.

  In the present embodiment, the pair of first portions 33a and the pair of second portions 33b are both symmetrical with respect to the center line L1. Although not shown, as long as the pair of first portions 33a and the pair of second portions 33b are both positioned between the two inscribed straight lines L2, the pair of first portions 33a and the pair of second portions. 33b may not be line symmetric with respect to the center line L1. Moreover, although a pair of 1st part 33a is line symmetrical, you may employ | adopt the shape that a pair of 2nd part 33b is not line symmetrical. Moreover, although a pair of 2nd part 33b is line symmetrical, you may employ | adopt the shape that a pair of 1st part 33a is not line symmetrical.

  In FIG. 3, reference numeral H1 denotes a 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 orthogonal direction D1 described above ( Hereinafter, this is also referred to as a first distance). A symbol H2 represents a distance between the tip point 33c and the inner contact P2 in the orthogonal direction D1 (hereinafter also referred to as a second distance). The first distance H1 is preferably 3 mm or more. The second distance H2 is preferably 3 mm or more. A value obtained by dividing the first distance H1 by the second distance H2 (= H1 / H2) is preferably 0.3 or more and 3.0 or less.

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

[Second unsealed part]
Next, the second non-seal portion 20c will be described. The second non-seal portion 20 c communicates with the outside of the bag 10. For example, in the present embodiment, as shown in FIG. 4, a through hole 31 that penetrates the first film 11 is formed in the second non-seal portion 20 c. For this reason, even if the first upper edge seal portion 21a extending along the first upper edge 21 extends from the one end 33x of the protruding seal portion 33 to the other end 33y, the broken portion of the protruding seal portion 33 is removed. The vapor passing through and reaching the second non-seal portion 20 c can escape to the outside of the bag 10. In the present specification, “destruction of the seal portion” means that the film is peeled off at the portion that was the seal portion.

  As shown in FIG. 4, not only in the first film 11 but also in the intermediate film 13, a through hole 31 that penetrates the intermediate film 13 may be formed in the second non-seal portion 20 c. Although not shown, the through hole 31 may be formed only in one of the first film 11 and the intermediate film 13.

  The second non-sealed portion 20c is preferably such that the portion of the second non-sealed portion 20c that is farthest from the first upper edge 21 (hereinafter also referred to as the tip point of the second non-sealed portion 20c) is the center described above. It is formed so as to be positioned on the line L1. In the present embodiment, the second non-seal portion 20c has a substantially pentagonal outline. The tip point of the second non-seal portion 20c is located at one vertex of the substantially pentagon.

(the film)
Next, an example of the layer configuration 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 a base material layer 52 and a thermoplastic resin layer 51. In the example shown in FIG. 5, the base material layer 52 constitutes the outer surfaces 11 y, 12 y, 13 y of the respective films 11, 12, 13, and the thermoplastic resin layer 51 constitutes the inner surfaces of the respective films 11, 12, 13. 11x, 12x, and 13x are configured. The base material layer 52 may be printed with characters, numbers, symbols, figures, patterns, etc. for indicating product information.

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

  Although not shown, the films 11, 12, and 13 may further include an intermediate layer disposed between the base material layer 52 and the thermoplastic resin layer 51. As the intermediate layer, an appropriate one can be selected according to required performance such as water vapor and other gas barrier properties, light shielding properties, various mechanical strengths, and the like. For example, a vapor deposition layer of a metal oxide such as aluminum oxide or an inorganic oxide such as silicon oxide can be provided as the intermediate layer. In addition, 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 as an intermediate layer. By providing such an intermediate layer, oxygen and water vapor can be prevented from entering the bag 10. A stretched nylon film may be provided as the intermediate layer. In this case, the puncture resistance of the bag 10 can be improved.

  In addition, it cannot be overemphasized that the layer structure of the 1st film 11, the 2nd film 12, and the intermediate | middle film 13 is not limited to what was mentioned above.

Although not shown, the films 11, 12, and 13 may be provided with easy opening means for easily breaking the bag 10 and 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 provided with a notch serving as a starting point of breakage. Moreover, the half cut line formed by laser processing, a cutter, etc. may be provided in the part used as the path | route at the time of fracture | rupturing the bag 10 as an easy opening means. Moreover, a stretched film may be included in the films 11, 12, and 13, and the stretched direction of the stretched film and the breaking direction of the bag 10 may be matched. Usually, the film stretching direction coincides with the film transport direction T in the bag 10 manufacturing method described later. Further, the bag 10 may be subjected to printing or the like for indicating the position to be opened to the user of the bag 10.
Further, in place of the notches, cuts and scars may be formed in the outer edge seal portion 20 a along the outer edge of the bag 10. The scar group may include, for example, a plurality of through holes formed so as 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.

(Bag manufacturing method)
Next, the manufacturing method of the bag 10 by this Embodiment is demonstrated.

[Film original fabric production process]
First, an example of the process of producing the raw material of the laminated film used as the origin of each film 11, 12, 13 is demonstrated. First, a raw material of one base material layer 52 is prepared. Here, the original fabric means a wound roll film. Next, printing may be performed on one surface of the film of the base material layer 52 while continuously conveying the long base material layer 52 unwound from one original fabric. For example, the printing display for the first film 11 is repeatedly performed on one side of the film of the long base layer 52, and the other side of the film of the long base layer 52 In addition, the print display for the second film 12 may be repeated. Next, the thermoplastic resin layer 51 is laminated on the film of the long substrate layer 52 by using a dry lamination method or a melt extrusion lamination method to produce a long laminated film. In this way, an original film of a laminated film for each of the films 11, 12, 13 is obtained. In addition, you may make it give a printing display to a laminated | multilayer film, without giving in the state of the film of a base material layer.

[Film preparation process]
Next, as shown in FIG. 6A, the original film of the laminated film is appropriately cut, and the first film 11, the second film 12, and the first film 11 in a state of being folded along the folded portion 13 c. An intermediate film 13 disposed between the second film 12 and the second film 12 is prepared. When the vapor escape 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.

  Thereafter, 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 second film 12 faces the inner surface 12x of the second film 12.

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

  Moreover, although not shown in figure, each film 11, 12, 13 may be mutually laminated | stacked in the state of the elongate film where many bags 10 were allocated. In this case, the films 11, 12, 13 are joined together to form the outer edge seal portion 20 a, and then the long films 11, 12, 13 are cut along the shape of the bag 10, thereby forming the bag 10. Is obtained.

[Thermal welding process]
Thereafter, the first film 11 and the second film 12 are heated along the outer edge from the outer surfaces 11y and 12y side 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. The inner surface 13x of the intermediate film 13 and the inner surface 11x of the first film 11 are thermally welded, and the inner surface 13x of the intermediate film 13 and the inner surface 12x of the second film 12 are thermally welded. As a result, as shown in FIG. 6B, seal portions such as the outer edge seal portion 20a and the protruding seal portion 33 are formed. As a result, the non-seal parts 20b and 20c surrounded by the seal part are defined. In the heat welding process, as shown in FIG. 6B, a vapor escape mechanism 30 is provided at 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). As implemented. Further, the heat welding process is performed at this stage so as not to form a seal portion on the lower edge 23 of the films 11 and 12.

[Cutting process]
Next, as shown in FIG. 6C, the films 11, 12, and 13 coupled to each other by the seal portion are cut along the outline of the bag 10. In this manner, the bag 10 including the vapor escape mechanism 30 formed on the first upper edge 21 is produced. 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 bag 10 is filled with the contents through the lower edge seal planned portion 23b (filling port) of the lower edge 23. Thereafter, the inner surface 11x of the first film 11 and the inner surface 12x of the second film 12 are thermally welded along the lower edge 23 to form the lower edge seal portion 23a. In this way, as shown in FIG. 6D, the bag 10 in which the contents are sealed in the accommodating portion 15 can be obtained.

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

  First, the bag 10 in a state where the second film 12 is positioned 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 increases, and accordingly, the water contained in the contents evaporates and the pressure in the accommodating portion 15 increases. In FIG. 7A, the expansion part 40 in which the first film 11 constituting the accommodation part 15 swells higher than the first film 11 constituting the outer edge seal part 20 a due to an increase in the pressure of the accommodation part 15 includes the accommodation part 15. It shows how it is formed. In addition, if the pressure of the accommodating part 15 increases, the 2nd film 12 which comprises the accommodating part 15 will swell below the 2nd film 12 which comprises the outer edge seal | sticker part 20a.

  FIG. 7A shows an example in which the wing portion 17 constituted by the first film 11 and the intermediate film 13 is folded toward the second upper edge 22 when the contents are heated. The state of the bag 10 during 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, and a state in which the wing portion 17 is folded upward. There may be.

  When the pressure in the accommodating portion 15 further increases 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 peels the first film 11 from the intermediate film 13 and destroys the protruding seal portion 33 acts on the second portion 33 b of the protruding seal portion 33. FIG. 7C is a diagram illustrating a state in which the expansion portion 40 is further enlarged and reaches the inner edge of the first portion 33 a 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 distal end point 33c is less than 180 °. For this reason, the force generated due to the expanding portion 40 can be concentrated on the tip point 33c first. Therefore, it is possible to easily peel the first film 11 from the intermediate film 13 at the tip point 33c and 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 projecting seal portion 33 is located closer to the intermediate point P1 side of the housing portion 15 than the inner contact P2. For this reason, the force which is going to peel the 1st film 11 from the intermediate | middle film 13 acts on the whole region of a pair of 2nd part 33b. On the other hand, when the pair of first portions 33a of the projecting seal portion 33 draws two inscribed straight lines L2 that are in contact with the inner edge of the projecting seal portion 33 from the above-described intermediate point P1 of the housing portion 15 by the inner contact P2, It is located closer to the first upper edge 21 than the inner contact P2. In this case, as shown in FIG. 7C, the force generated due to 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. For this reason, the force acting on the projecting seal portion 33 between the time when the expanding portion 40 that has expanded reaches the tip end point 33c of the projecting seal portion 33 and the time when it reaches the inner edge of the first upper edge seal portion 21a, It can concentrate on the part 33b. Therefore, as shown in FIG. 7D, the breakage of the protruding seal portion 33 can be easily advanced at the second portion 33b.

  When the portion where the projecting seal portion 33 is broken reaches the second non-seal portion 20 c, the steam in the storage portion 15 passes through the portion where the projecting seal portion 33 is broken, the second non-seal portion 20 c and the through hole 31. And go outside. Thereby, the pressure inside the accommodating part 15 can be reduced and it can suppress that the bag 10 bursts.

  Further, as described above, the force acting on the first portion 33a due to the expanding portion 40 is weaker than the force acting on the second portion 33b. For this reason, according to this Embodiment, it can suppress that destruction of the protrusion seal | sticker part 33 advances in the 1st part 33a. Accordingly, it is possible to prevent the breakage of the protruding seal portion 33 from reaching the outer edge of the bag 10 and the contents leaking out from the outer edge of the bag 10. Further, according to the present embodiment, the force acting on the projecting seal portion 33 can be concentrated on the second portion 33b and the second portion 33b can be destroyed, so the first side edge seal portion 24a and the second side It is possible to suppress the outer edge seal portion 20a such as the edge seal portion 25a from being destroyed before the protruding seal portion 33. For this reason, it can suppress that the contents leak from the outer edge of the bag 10.

  Further, according to the present embodiment, the protruding seal portion 33 includes the pair of first portions 33a, so that 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 part 15 can be shortened. As a result, the force acting on the tip point 33c due to the inflating portion 40 can be increased. Accordingly, it is possible to more easily peel the first film 11 from the intermediate film 13 at the front end point 33c and break the protruding seal portion 33.

  Note that various modifications can be made to the above-described embodiment. Hereinafter, modified examples will be described 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 parts in the above embodiment are used for the parts that can be configured in the same manner as in the above embodiment. A duplicate description is omitted. In addition, when it is clear that the operational effects obtained in the above-described embodiment can be obtained in the modified example, the description thereof may be omitted.

(Variation of steam release mechanism)
Hereinafter, some modified examples of the shape of the steam escape mechanism 30 will be described. 8 to 12 are diagrams showing modifications of the steam escape mechanism 30.

[First Modification]
In the above-described embodiment, an example in which the pair of second portions 33b of the projecting seal portion 33 extends linearly has been described. However, the present invention is not limited to this, and the pair of second portions 33b may include curved portions. 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 toward the outer edge side. 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 manner, the force resulting from the expanding 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 extends linearly, the angle θ formed by the pair of second portions 33b at the tip point 33c can be less than 90 °. is there.

[Third Modification]
Further, in the above-described embodiment, the example in which the outline of the protruding seal part 33 and the second non-seal part 20c is a substantially pentagon is shown. However, the contour of the second non-seal portion 20c is not particularly limited as long as the steam can be appropriately extracted outside the bag 10 at the second non-seal portion 20c. For example, as shown in FIG. 10, the outline of the second non-seal portion 20c may be circular.

[Fourth Modification]
Further, in the present embodiment described above, an example in which the circular through-hole 31 is formed in the second non-seal portion 20c of the steam release mechanism 30 has been shown. However, the shape of the through hole 31 is not particularly limited as long as the second non-sealed portion 20c can be communicated with the outside of the bag 10 and the steam can be extracted. For example, as shown in FIG. 11, a slit-like through hole 31 may be formed in the second non-seal portion 20c. The slit-shaped through hole 31 is formed by, for example, making a cut in the first film 11 or the intermediate film 13.

[Fifth Modification]
In the above-described embodiment, the first upper edge seal portion 21a includes a portion extending from one end 33x to the other end 33y of the projecting seal portion 33, and the projecting seal portion 33 and the first upper edge seal portion. The example which formed the through-hole 31 in the 2nd non-seal part 20c enclosed by 21a was shown. However, the configuration of the steam release mechanism 30 in the portion outside the outer edge of the projecting seal portion 33 is not particularly limited as long as the steam in the housing portion 15 can be released to the outside of the bag 10. For example, as shown in FIG. 12, the second non-seal portion 20 c that contacts the outer edge of the protruding seal portion 33 may be formed so as to contact the first upper edge 21. In other words, the first upper edge seal portion 21a may not include a portion extending from the one end 33x of the protruding seal portion 33 to the other end 33y. In this case, even if no through hole is formed in the second non-sealed portion 20c, the vapor that has reached the second non-sealed portion 20c through the broken portion of the projecting seal portion 33 is from the first upper edge 21. The bag 10 can be pulled out.

(Bag variant)
Hereinafter, some modified examples of the configuration of the bag 10 will be described. 13 and 14 are diagrams showing modifications of the bag 10, respectively.

(First modification)
In the above-described embodiment, the bag 10 includes the intermediate film 13 disposed 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. And the example connected to the outer edge seal | sticker part 20a formed by couple | bonding the intermediate | middle film 13 was shown. However, the configuration of the bag 10 is not particularly limited as long as the vapor escape 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 that includes the first film 11 and the second film 12 and does not include 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.

  Although not shown, when the bag 10 includes the intermediate film 13 disposed between the first film 11 and the second film 12 in a folded state, the protruding seal portion 33 is provided with the first film 11. And you may be connected to the outer edge seal | sticker part 20a (for example, 1st upper edge seal | sticker part 21a) formed by the 2nd film 12 being couple | bonded. For example, in the so-called bottom gusset type bag 10, the protruding seal portion 33 connected to the upper edge seal portion of the bag 10 may be formed.

(Second modification)
Moreover, although the example which forms the protrusion seal part 33 connected to the 1st upper edge seal part 21a of the bag 10 was shown in the above-mentioned this Embodiment, the position which provides the protrusion seal part 33 is especially limited. There is no. For example, as shown in FIG. 14, a protruding seal portion 33 connected to the first side edge seal portion 24 a of the bag 10 may be formed.

  In addition, although some modified examples with respect to the above-described embodiment have been described, naturally, a plurality of modified examples can be applied in combination as appropriate.

  EXAMPLES Next, although an Example demonstrates this invention further more concretely, this invention is not limited to description of a following example, unless the summary is exceeded.

(Example)
The bag 10 provided with the steam escape mechanism 30 which has the protrusion seal | sticker part 33 containing a pair of 1st part 33a, a pair of 2nd part 33b, and the front-end | tip point 33c shown in above-mentioned FIG. 1 was prepared. The angle θ formed by the pair of second portions 33b at the tip point 33c was 120 °. Further, the first distance H1 and the second distance H2 shown in FIG. 3 were 4 mm and 6 mm, respectively. Further, the above-described distance 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, 100 g of water was filled in the container 15 of the bag 10, and the water was heated in a microwave oven with an output of 600 W. As a result, in all the samples of the ten bags 10, film peeling occurred at the tip point 33c of the projecting seal portion 33 and the pair of second portions 33b, and no film peeling was observed at the outer edge seal portion 20a. Then, the steam appropriately escaped to the outside of the bag 10 through the non-sealed portion 20c, and water did not leak to the outside of the bag 10. Further, in all the samples, the peeling of the film at the protruding seal portion 33 did not reach the first upper edge seal portion 21a to which the protruding seal portion 33 was connected.

(Comparative example)
In FIG. 1, a bag provided with a steam escape 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. 15. In the protruding seal portion 133 shown in FIG. 15, a pair of linear second portions 33b connected at the tip point 33c extends to the first upper edge seal portion 21a. In addition, the angle which a pair of 2nd part 33b makes at the front-end | tip point 33c was 90 degrees.

  In the same manner as in the example, 100 g of water was filled in the bag storage portion provided with the steam escape mechanism including the protruding seal portion 133 shown in FIG. 15, and the water was heated in a microwave oven with an output of 600 W. As a result, in all the ten bag samples, the peeling of the film generated in the protruding seal portion 133 progressed to the first side edge seal portion 24a or the second side edge seal portion 25a. For this reason, water leaked out from the first side edge 24 or the second side edge 25.

10 bag 11 first film 12 second film 13 intermediate film 15 housing part 17 wing part 20a seal part 20b first non-seal part 20c second non-seal part 21 first upper edge 21a first upper edge seal part 22 second 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 Projection 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 Inner contact

Claims (7)

A bag containing film and containing contents,
A seal portion in which the opposing films are coupled to each other;
A non-seal part in which the opposing films are not joined together,
The non-seal part has a first non-seal part that defines an accommodating part in which the contents are accommodated,
The seal portion has an outer edge seal portion extending along an outer edge of the bag, and a protruding seal portion connected to the outer edge seal portion,
The outer edge of the protruding seal part communicates with the outside of the bag,
Of the projecting seal portions, a point farthest from one outer edge of the bag along the outer edge seal portion to which the projecting seal portion is connected is referred to as a tip point, and the one outer edge of the bag When the straight line extending in the orthogonal direction and passing through the tip point is referred to as a center line, and the point located on the center line and 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,
The projecting seal portion is positioned on the one outer edge side of the inner contact when the two inscribed straight lines that pass through the intermediate point and are in contact with the inner edge of the projecting seal portion by the inner contact and the 2 A pair of first portions located between two inscribed straight lines, and located on the intermediate point side of the inner contact and located between the two inscribed straight lines and connected at the tip point A pair of second parts,
An angle formed by the pair of second portions at the tip point is less than 180 °.   The bag according to claim 1, wherein a 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.   The bag according to claim 1 or 2, wherein a distance between the tip point and the inner contact in the orthogonal direction is 3 mm or more.   The distance between the outer edge seal portion to which the protruding seal portion is connected in the orthogonal direction and the inner contact is referred to as a first distance, and the distance between the tip point and the inner contact in the orthogonal direction. 4 is a bag according to any one of claims 1 to 3, wherein a 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 the pair of first portions and the pair of second portions are both symmetrical with respect to the center line.   The bag according to any one of claims 1 to 5, wherein the pair of second portions has a convex shape that is convex from the inner edge side toward the outer edge side. The film includes a first film and a second film, and an intermediate film disposed between the first film and the second film in a folded state,
The bag according to any one of claims 1 to 6, wherein the projecting seal portion is connected to the outer edge seal portion formed by combining the first film and the intermediate film in the outer edge seal portion.

Images