Bag

Abstract

To provide a bag capable of suppressing blockage of a spout part.SOLUTION: A bag 10 includes: a trunk part film folded so as to constitute a first surface 21 and a second surface 22 opposing to the first surface of the bag; a first side part 13 which is the first side part at least partially including a folded part 13b in which the trunk part film is folded, and in which part of the folded part constitutes a first side of a spout part 30; a second side part 14 opposing to the first side part; and an upper part which is the upper part including an upper part seal part 11a extending so as to be inclined downward at least partially toward the side of the second side part from the side of the first side part, and in which at least part of the portion extending so as to be inclined downward out of the upper part seal part constitutes a second side opposing to the first side by sandwiching a spout passage of the spout part.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a bag for containing a fluid content.

Background Art

[0002] As a bag for containing a fluid content, a bag made of a flexible packaging material is used. The bag has a spout portion through which the fluid passes when the fluid contained inside is poured out of the bag.

[0003] A bag made of a flexible packaging material is lightweight, but has poor opening and shape retention properties at the spout portion. For this reason, there is a problem that the spout portion is likely to be blocked during the pouring of the content. For example, during pouring, a portion of the main body located near the spout portion may bulge, and the spout portion may be blocked by the pressure of the content at this time. To solve such problems, for example, in Patent Document 1, it has been proposed to suppress the blockage of the spout portion by providing an emboss on the laminated film constituting the spout portion.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] When an emboss is provided on the laminated film constituting the spout portion as in Patent Document 1, a step of embossing the laminated film is required, so the productivity of the bag decreases.

[0006] The present invention has been made in consideration of such problems, and an object thereof is to provide a bag capable of suppressing the blockage of the spout portion.

Means for Solving the Problems

[0007] The present invention relates to a bag having a spout portion for pouring out a fluid accommodated therein, a body film folded back so as to form a first surface of the bag and a second surface facing the first surface, a first side portion at least partially including a folded-back portion where the body film is folded back, and a part of the folded-back portion constituting a first side of the spout portion, the first side portion, a second side portion facing the first side portion, an upper portion including an upper seal portion extending at least partially downward as it extends from the side of the first side portion toward the side of the second side portion, and at least a part of the portion of the upper seal portion extending downward constitutes a second side facing the first side across a pouring path of the spout portion. The bag includes an upper portion.

[0008] The bag according to the present invention may further include a notch formed in the upper seal portion constituting the second side of the spout portion.

[0009] In the bag according to the present invention, the angle formed by the direction in which the first side of the spout portion extends and the direction in which the edge portion on the first side of the upper seal portion constituting the second side extends may be 10 degrees or more and 90 degrees or less.

[0010] In the bag according to the present invention, the portion of the upper seal portion extending downward may extend from the first side portion to the second side portion.

[0011] In the bag according to the present invention, the upper seal portion of the upper portion may include a portion extending downward and a portion extending in a direction different from the portion extending downward from the end of the portion extending downward toward the side of the second side portion.

[0012] In the bag according to the present invention, the second side portion may include a second side portion seal portion.

[0013] In the bag according to the present invention, the second side portion at least partially includes a folded-back portion where the body film is folded back, the bag extends from the upper portion to the lower portion facing the upper portion, and the bag may further include a clasp seal portion where the inner surfaces of the body films located on the first surface side or the inner surfaces of the body films located on the second surface side are joined.

Advantages of the Invention

[0014] According to the present invention, it is possible to prevent the pouring outlet portion from being blocked.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Mode for Carrying Out the Invention

[0016] Hereinafter, with reference to FIGS. 1 to 10, an embodiment of the present invention will be described. In the drawings attached to this specification, for the convenience of illustration and easy understanding, the scale, the aspect ratio of the vertical and horizontal dimensions, etc. are appropriately changed and exaggerated from those of the actual object.

[0017] In addition, regarding the terms used in this specification for specifying shapes, geometric conditions, and their degrees, such as terms like "orthogonal" and "identical", and values of lengths and angles, etc., they are not bound by strict meanings and are to be interpreted including ranges where similar functions can be expected.

[0018] Bag FIG. 1 is a perspective view showing the bag 10 according to this embodiment as seen from the first surface side. In FIG. 1, the bag 10 is shown in a state where a lower film 24, which will be described later and constitutes the lower part 12 of the bag 10, extends horizontally. On the other hand, in FIGS. 3 and other front views to be described later, the bag 10 is shown in a state where the lower film 24 is folded.

[0019] The bag 10 has a first surface 21 and a second surface 22 facing the first surface 21. The first surface 21 and the second surface 22 are each constituted by a folded body film 23 as will be described later. The bag 10 also includes an upper part 11, a lower part 12, a first side part 13, and a second side part 14. Note that names such as "upper part", "lower part", and "side part", and terms such as "upward", "downward", "vertical direction", and "horizontal direction" represent the positions and directions of the bag 10 and its components based on the state where the spout part 30 to be described later is located upward.

[0020] In the present embodiment, the bag 10 is a so-called bottom gusset bag in which a gusset is formed in the lower portion 12. In this case, a lower film 24, which will be described later, is inserted between the folded body films 23.

[0021] The bag 10 contains a fluid having fluidity as its content. The fluid is, for example, daily necessities such as liquid detergents and shampoos, or foods such as soy sauce and dressings. Further, the fluid may be a powder such as coffee powder or wheat flour, or may be a granule such as a flake. The bag 10 has a spout portion 30 through which the fluid passes when pouring out the fluid from the bag 10.

[0022] The bag 10 is, for example, a refill bag for transferring the fluid contained in the bag 10 to a container such as a bottle through the spout portion 30. Further, the bag 10 may be used to directly take out the fluid contained in the bag 10 onto a plate or the like through the spout portion 30.

[0023] Hereinafter, with reference to FIGS. 2 and 3 in addition to FIG. 1, the configuration of the bag 10 will be described in detail. FIG. 2 is an exploded view showing the films constituting the bag 10. FIG. 3 is a front view showing the bag 10 as viewed from the first surface side.

[0024] As shown in FIG. 2, the bag 10 has a body film 23 folded along a folded portion 23a. In the present embodiment, the portion between the folded portion 23a and the first end portion 23b of the body film 23 constitutes the first surface 21 of the bag 10, and the portion between the folded portion 23a and the second end portion 23c constitutes the second surface 22 of the bag 10.

[0025] The bag 10 further has a lower film 24 inserted into the lower part of the folded body film 23. The lower film 24 is inserted into the body film 23 in a folded state along the folding part 24a. The part of the lower film 24 between the folding part 24a and the first end part 24b is joined to the inner surface of the body film 23 that constitutes the first surface 21 of the bag 10. Also, the part of the lower film 24 between the folding part 24a and the second end part 24c is joined to the inner surface of the body film 23 that constitutes the second surface 22 of the bag 10. As shown in FIG. 2, a notch 24d may be formed at the side end part of the lower film 24. Note that the "inner surface" means the surface located on the storage space side of the bag 10 in which the content is stored.

[0026] Next, the upper part 11, the lower part 12, the first side part 13, and the second side part 14 of the bag 10 will be described in detail.

[0027] As shown in FIGS. 1 and 3, the upper part 11 includes an upper seal part 11a. The upper seal part 11a is a seal part where the inner surface of the body film 23 that constitutes the first surface 21 and the inner surface of the body film 23 that constitutes the second surface 22 are joined. The upper seal part 11a at least partially includes an inclined part 11b that extends so as to incline downward from the side of the first side part 13 toward the side of the second side part 14. In the present embodiment, the inclined part 11b extends linearly from the upper end of the first side part 13 to the upper end of the second side part 14.

[0028] As shown in FIGS. 1 and 3, the lower part 12 faces the upper part 11 in the vertical direction in the bag 10 where the lower part 12 is located downward. In the present embodiment, the lower part 12 is the part where the lower film 24 is provided. The lower part 12 includes a lower seal part 12a. The lower seal part 12a includes a seal part where the inner surface of the body film 23 that constitutes the first surface 21 and the inner surface of the lower film 24 are joined, and a seal part where the inner surface of the body film 23 that constitutes the second surface 22 and the inner surface of the lower film 24 are joined.

[0029] In FIG. 3, reference numeral L1 represents the dimension of the lower seal portion 12a in the vertical direction. The dimension L1 is preferably 20 mm or more, more preferably 30 mm or more. Also, the dimension L1 is preferably 60 mm or less, more preferably 50 mm or less.

[0030] When the above-described notch 24d is formed in the lower film 24, the lower portion 12 may include a notch seal portion 12b in which the inner surface of the body film 23 constituting the first surface 21 and the inner surface of the body film 23 constituting the second surface 22 are joined via the notch 24d.

[0031] As shown in FIGS. 1 and 3, the first side portion 13 at least partially includes a folded-back portion 13b (the above-described folded-back portion 23a) where the body film 23 is folded back. The first side portion 13 may partially include a first side portion seal portion 13a that extends from the lower portion 12 toward the upper end of the first side portion 13. The first side portion seal portion 13a is a seal portion where the inner surface of the body film 23 constituting the first surface 21 and the inner surface of the body film 23 constituting the second surface 22 are joined.

[0032] In FIG. 3, reference numeral L2 represents the dimension of the first side portion seal portion 13a in the vertical direction. The dimension L2 is preferably 3 mm or more, more preferably 5 mm or more. Also, the dimension L2 is preferably 30 mm or less, more preferably 20 mm or less.

[0033] As shown in FIGS. 1 and 3, the second side portion 14 faces the first side portion 13 in a direction orthogonal to the direction in which the folded-back portion 13b of the first side portion 13 extends. In the following description, the direction orthogonal to the direction in which the folded-back portion 13b of the first side portion 13 extends is also referred to as the lateral direction.

[0034] The second side portion 14 includes a second side portion seal portion 14a. The second side portion seal portion 14a is a seal portion where the inner surface of the body film 23 constituting the first surface 21 and the inner surface of the body film 23 constituting the second surface 22 are joined. In the present embodiment, the second side portion seal portion 14a extends over the entire area of the second side portion 14. That is, the second side portion seal portion 14a extends linearly from the lower seal portion 12a of the lower portion 12 to the upper seal portion 11a of the upper portion 11.

[0035] (Pouring outlet portion) Next, the pouring outlet portion 30 will be described. As shown in FIGS. 1 and 3, the pouring outlet portion 30 is located at the portion where the upper portion 11 and the first side portion 13 intersect. The pouring outlet portion 30 includes a first side 31 and a second side 32 that intersect at an acute angle. Between the first side 31 and the second side 32, a pouring path 30a through which the fluid passes when pouring the fluid to the outside is formed.

[0036] FIG. 4 is a cross-sectional view showing the case where the pouring outlet portion 30 of the bag 10 shown in FIG. 3 is viewed along the line A-A. As shown in FIGS. 3 and 4, the first side 31 is constituted by a part of the folded-back portion 13b of the first side portion 13. Further, the second side 32 is constituted by the inclined portion 11b of the upper seal portion 11a of the upper portion 11. When the first side 31 includes the folded-back portion 13b, it is possible to suppress the inner surface of the body film 23 constituting the first surface 21 side of the pouring outlet portion 30 and the inner surface of the body film 23 constituting the second surface 22 side from being in close contact with each other due to the stiffness (loop stiffness) of the body film 23 itself. For this reason, it is possible to suppress the pouring outlet portion 30 from being blocked when pouring the fluid.

[0037] FIG. 5 is a front view showing an enlarged view of the pouring outlet portion 30 of the bag 10 shown in FIG. 3. The symbol θ1 represents the angle formed by the direction in which the edge portion on the outer side (the side far from the first side 31) of the upper seal portion 11a constituting the second side 32 extends and the lateral direction. The angle θ1 is preferably 10 degrees or more, more preferably 20 degrees or more. Further, the angle θ1 is preferably 90 degrees or less, more preferably 70 degrees or less.

[0038] In FIG. 5, reference numeral θ2 represents the angle formed by the direction in which the edge on the inner side (the side of the first side 31) of the upper seal portion 11a constituting the second side 32 extends and the horizontal direction. The angle θ2 is preferably 10 degrees or more, more preferably 20 degrees or more. Also, the angle θ2 is preferably 90 degrees or less, more preferably 80 degrees or less.

[0039] In FIG. 5, reference numeral θ3 represents the angle formed by the direction in which the folded-back portion 13b constituting the first side 31 extends and the direction in which the edge on the inner side (the side of the first side 31) of the upper seal portion 11a constituting the second side 32 extends. The angle θ3 is preferably 10 degrees or more, more preferably 20 degrees or more. Also, the angle θ3 is preferably 80 degrees or less, more preferably 70 degrees or less.

[0040] The bag 10 may be provided with a planned opening portion 33 that serves as a path for breaking the body film 23 constituting the spout portion 30 to open the bag 10. The planned opening portion includes, for example, a notch 33a formed at the outer edge of the upper seal portion 11a constituting the second side 32, as shown in FIGS. 1 and 3. By breaking the spout portion 30 starting from the notch 33a to form a spout 35 in the spout portion 30, it becomes possible to pour out the fluid from the spout.

[0041] Although not shown, the planned opening portion 33 may include a cut formed at the outer edge of the upper seal portion 11a. Also, although not shown, the planned opening portion 33 may include a group of scars formed on the body film 23. The group of scars includes, for example, a plurality of through-holes penetrating the body film 23 located in the upper seal portion 11a constituting the second side 32. Also, the planned opening portion 33 may include a half-cut line formed by laser processing or a cutter on the body film 23 located in the spout portion 30. Further, the planned opening portion may include a printed indication 33b indicating the path to be opened.

[0042] (Body film) Next, the layer structure of the body film 23 will be described. FIG. 6 is a cross-sectional view showing an example of the layer structure of the body film 23. The body film 23 includes at least a sealant layer 41 and a base material layer 42. In the example shown in FIG. 6, the sealant layer 41 constitutes the inner surface 23x of the body film 23. Further, the base material layer 42 constitutes the outer surface 23y of the body film 23.

[0043] As the material constituting the sealant layer 41, for example, thermoplastic resins such as polyethylene and polypropylene can be used.

[0044] Polyethylene is classified into low-density polyethylene, medium-density polyethylene, and high-density polyethylene, for example, based on density. Low-density polyethylene refers to polyethylene having a density of 0.910 g / cm 3 or more and 0.925 g / cm 3 or less. Medium-density polyethylene refers to polyethylene having a density of 0.926 g / cm 3 or more and 0.940 g / cm 3 or less. High-density polyethylene refers to polyethylene having a density of 0.941 g / cm 3 or more and 0.965 g / cm 3 or less. Low-density polyethylene can be obtained, for example, by polymerizing ethylene at a high pressure of 1000 atmospheres or more and less than 2000 atmospheres. Medium-density polyethylene and high-density polyethylene can be obtained, for example, by polymerizing ethylene at a medium pressure or low pressure of 1 atmosphere or more and less than 1000 atmospheres. Note that medium-density polyethylene and high-density polyethylene may partially contain a copolymer of ethylene and α-olefin.

[0045] Even when ethylene is polymerized at medium or low pressure and the copolymer of ethylene and α-olefin is included, medium density or low density polyethylene can be produced. Such polyethylene is called linear low density polyethylene. Linear low density polyethylene is obtained by copolymerizing α-olefin with a linear polymer obtained by polymerizing ethylene at medium or low pressure to introduce short chain branches. Examples of α-olefin include 1-butene (C4), 1-hexene (C6), 4-methylpentene (C6), 1-octene (C8), etc. The density of linear low density polyethylene is, for example, 0.915 g / cm 3 or more and 0.945 g / cm 3 or less.

[0046] As the polyethylene constituting the sealant layer 41, low density polyethylene, linear low density polyethylene, etc. can be used. Preferably, the sealant layer 41 contains linear low density polyethylene. Thereby, the seal strength can be increased and the impact resistance of the bag 10 such as the drop strength can be increased. The sealant layer 41 may further contain low density polyethylene in addition to linear low density polyethylene. Thereby, the tearability of the body film 23 can be increased. When the sealant layer 41 contains both linear low density polyethylene and low density polyethylene, preferably, the content (weight %) of linear low density polyethylene is larger than the content (weight %) of low density polyethylene. The sealant layer 41 may be a single layer or a multilayer.

[0047] The thickness of the sealant layer 41 is preferably 80 μm or more, more preferably 120 μm or more. Also, the thickness of the sealant layer 41 is preferably 170 μm or less, more preferably 150 μm or less.

[0048] The base material layer 42 may include at least one stretched plastic film. The base material layer 42 may include two, three, or more stretched plastic films. The stretched plastic film may be a uniaxially stretched film stretched in a predetermined one direction, or may be a biaxially stretched film stretched in a predetermined two directions. The stretching ratio of the stretched plastic film is, for example, 1.05 times or more.

[0049] The stretched plastic film contains, for example, polyester as a main component. Examples of the polyester include polyethylene terephthalate (hereinafter also referred to as PET), polybutylene terephthalate (hereinafter also referred to as PBT), and the like. Further, the stretched plastic film may contain polyamide as a main component. Examples of the polyamide-based include aliphatic polyamide or aromatic polyamide. Examples of the aliphatic polyamide include nylons such as nylon-6, nylon-6,6, and a copolymer of nylon 6 and nylon 6,6, and examples of the aromatic polyamide include polymetaxylylene adipamide (MXD6).

[0050] The thickness of one stretched plastic film is preferably 5 μm or more, more preferably 10 μm or more. Also, the thickness of one stretched plastic film is preferably 30 μm or less, more preferably 25 μm or less. Further, when the base material layer 42 includes a plurality of stretched plastic films, the thickness of the entire base material layer 42 is preferably 10 μm or more, more preferably 20 μm or more. Also, the thickness of the entire base material layer 42 is preferably 60 μm or less, more preferably 50 μm or less.

[0051] The base material layer 42 may include paper. In the case of paper, the thickness (basis weight) of the base material layer 42 is, for example, 20 g / m 2 or more and 100 g / m 2 or less.

[0052] The base material layer 42 may be provided with a printed display for indicating product information or imparting aesthetic feeling. Examples of the printed display include characters, numbers, symbols, figures, patterns, etc.

[0053] Examples of the method for laminating the sealant layer 41 and the base material layer 42 include a melt extrusion method, a dry lamination method, etc. In the melt extrusion method, the material constituting the sealant layer 41 is extruded onto the base material layer 42. In the dry lamination method, the film-like sealant layer 41 and the film-like base material layer 42 are bonded together using an adhesive.

[0054] (Lower film) Next, the layer structure of the lower film 24 will be described. FIG. 7 is a cross-sectional view showing an example of the layer structure of the lower film 24. The lower film 24 includes at least a sealant layer 46 and a base material layer 47. In the example shown in FIG. 7, the sealant layer 46 constitutes the inner surface 24x of the lower film 24. Also, the base material layer 47 constitutes the outer surface 24y of the lower film 24.

[0055] As long as the inner surface 24x of the lower film 24 can be joined to the inner surface 23x of the body film 23, the layer structure of the lower film 24 is arbitrary. For example, the sealant layer 46 and the base material layer 47 constituting the lower film 24 may be the same as the sealant layer 41 and the base material layer 42 constituting the body film 23. Also, the sealant layer 46 and the sealant layer 41 may be different, and the base material layer 47 and the base material layer 42 may be different.

[0056] Method for manufacturing a bag Next, an example of the method for manufacturing the above-mentioned bag 10 will be described. First, the body film 23 and the lower film 24 shown in FIG. 2 are prepared. Subsequently, as shown in FIG. 8, the lower film 24 in the folded state at the folding portion 24a is inserted below the body film 23 in the folded state at the folding portion 23a.

[0057] Subsequently, as shown in FIG. 9, the inner surface of the body film 23 and the inner surface of the lower film 24 are partially joined to form the lower seal portion 12a. Also, the inner surfaces of the folded-back body films 23 are partially joined to form the first side seal portion 13a and the second side seal portion 14a. As shown in FIG. 9, the first side seal portion 13a is formed along the first side portion 13 such that it is connected to the lower seal portion 12a and a folded-back portion 13b remains. The second side seal portion 14a is formed along the second side portion 14 such that it is connected to the lower seal portion 12a and the first end portion 23b and the second end portion 23c of the body film 23 are sealed over the entire area. At this time, no seal portion is formed on the upper portion 11, and the upper portion 11 is an opening 11p.

[0058] Note that in the example shown in FIG. 9, the entire area of the upper portion 11 is the opening 11p, but it is not limited to this, and an upper seal portion 11a may be partially formed on the upper portion 11.

[0059] Next, the bag 10 is filled with a fluid content through the opening 11p of the upper portion 11 of the bag 10. Then, the inner surfaces of the body films 23 are joined at the upper portion 11 to form the upper seal portion 11a. In this way, a bag 10 in which the fluid is accommodated and sealed can be obtained.

[0060] (Pouring method) Subsequently, a method for pouring the fluid accommodated in the bag 10 will be described. First, the spout portion 30 is broken along the unsealing planned portion 33 to form a spout at the spout portion 30. Subsequently, as shown in FIG. 10, the bag 10 is held such that the spout 35 faces downward. Thereby, the fluid that has passed through the pouring path 30a can be poured out from the spout 35 to the outside. At this time, as shown in FIG. 10, the bag 10 may be held such that the first side portion 13 is positioned below the second side portion 14.

[0061] In the present embodiment, the first side 31 of the spout portion 30 is constituted by a folded-back portion 13b formed by folding back the body film 23. Therefore, compared with the case where both the first side 31 and the second side 32 are constituted by a seal portion, it is possible to suppress the inner surface of the body film 23 constituting the first surface 21 side of the spout portion 30 and the inner surface of the body film 23 constituting the second surface 22 side from being in close contact with each other. Thereby, it is possible to suppress the spout portion 30 from being blocked when pouring out the fluid. Also, it is possible to suppress the spout portion 30 from being blocked due to the spout portion 30 being bent.

[0062] Further, since the first side 31 is constituted by the folded-back portion 13b, when the first side portion 13 is located below the second side portion 14 as shown in FIG. 10, the fluid easily flows along the first side portion 13. Thereby, the pourability of the fluid can be enhanced.

[0063] Also, the second side 32 of the spout portion 30 is constituted by an inclined portion 11b that extends so as to incline downward as it goes toward the side of the second side portion 14. Therefore, the angle formed by the first side 31 and the second side 32 can be made an acute angle. Thereby, when the bag 10 is a refill bag for transferring the fluid accommodated in the bag 10 to a container such as a bottle, it becomes easier to insert the spout 35 of the spout portion 30 into the mouth portion of the bottle.

[0064] It should be noted that various modifications can be made to the above-described embodiment. Hereinafter, with reference to the drawings, modified examples will be described. In the following description and the drawings used in the following description, for parts that can be configured in the same manner as in the above-described embodiment, the same reference numerals as those used for the corresponding parts in the above-described embodiment will be used, and redundant descriptions will be omitted. Also, when it is clear that the operational effects obtained in the above-described embodiment can also be obtained in the modified example, the description thereof may be omitted.

[0065] (First Modified Example) In the above-described embodiments, an example in which the entire upper seal portion 11a of the upper portion 11 is composed of the inclined portion 11b has been shown. However, as long as the second side 32 of the spout portion 30 is constituted by the inclined portion 11b, the direction in which the upper seal portion 11a extends is arbitrary. For example, as shown in FIG. 11, the upper seal portion 11a may include a portion 11c that extends in a direction different from that of the inclined portion 11b from the end on the second side portion 14 side of the inclined portion 11b toward the second side portion 14 side. The angle formed by the direction in which the portion 11c extends and the lateral direction is smaller than the angle formed by the direction in which the inclined portion 11b extends and the lateral direction. Therefore, the volume of the bag 10 can be increased as compared with the case where the entire upper seal portion 11a is composed of the inclined portion 11b. In the example shown in FIG. 11, the portion 11c extends in the lateral direction.

[0066] (Second Modified Example) In the above-described embodiments, an example in which the entire second side portion 14 is composed of the second side portion seal portion 14a has been shown. However, the present invention is not limited to this, and as shown in FIG. 12, the second side portion 14 may include a folded-back portion 14b formed by folding back the body film 23 in the same manner as the first side portion 13. In the example shown in FIG. 12, the second side portion 14 includes a second side portion seal portion 14a that extends from the lower portion 12 toward the upper end of the second side portion 14, and a folded-back portion 14b that extends from the upper end of the second side portion seal portion 14a to the upper end of the second side portion 14.

[0067] When the second side portion 14 includes the folded-back portion 14b, the bag 10 includes a clasp portion 15 that is located between the first side portion 13 and the second side portion 14 on the first surface 21 side, as shown in FIG. 12. In the example shown in FIG. 12, the clasp portion 15 is located in the middle of the first side portion 13 and the second side portion 14. The clasp portion 15 includes a clasp seal portion 15a in which the inner surfaces of the ends of the body film 23 located on the first surface 21 side are joined. The clasp seal portion 15a seals the first end portion 23b and the second end portion 23c of the body film 23 over the entire area. The clasp seal portion 15a extends in the vertical direction from the upper seal portion 11a of the upper portion 11 to the lower seal portion 12a of the lower portion 12.

[0068] Although not shown in the drawing, the clasping portion 15 may be located on the second surface 22 side. In this case, the clasping seal portion 15a is a seal portion formed by joining the inner surfaces of the ends of the body film 23 located on the second surface 22 side.

[0069] Also in this modified example, the first side 31 of the pouring outlet portion 30 is constituted by the folded-back portion 13b of the first side portion 13. Therefore, it is possible to prevent the pouring outlet portion 30 from being blocked when pouring out the fluid.

[0070] (Third Modified Example) In the above-described embodiment, an example in which the bag 10 includes the lower film 24 inserted between the folded body films 23 has been shown. However, the present invention is not limited to this, and as shown in FIG. 13 or FIG. 14, the bag 10 may not include the lower film 24. In this case, the lower seal portion 12a of the lower portion 12 of the bag 10 is a seal portion formed by joining the inner surface of the body film 23 constituting the first surface 21 and the inner surface of the body film 23 constituting the second surface 22.

[0071] In the example shown in FIG. 13, the second side portion 14 of the bag 10 includes a second side portion seal portion 14a extending from the lower seal portion 12a to the upper seal portion 11a, similar to the case of the example shown in FIG. 3. In the example shown in FIG. 14, the bag 10 includes a clasping portion 15 and a clasping seal portion 15a, similar to the case of the example shown in FIG. 12. In this case, as shown in FIG. 14, the second side portion 14 may be constituted by a folded-back portion 14b extending from the lower seal portion 12a to the upper seal portion 11a.

[0072] Although some modified examples of the above-described embodiment have been described, of course, it is also possible to appropriately combine and apply a plurality of modified examples.

Explanation of Reference Numerals

[0073] 10 Bag 11 Upper portion 11a Upper seal portion 11b Inclined portion 12 Lower portion 12a Lower sealing part 13 First side part 13a First side part sealing part 13b Folding part 14 Second side part 14a Second side part sealing part 14b Folding part 15 Clasping part 15a Clasping seal part 21 First surface 22 Second surface 23 Barrel film 23a Folding part 23b First end part 23c Second end part 24 Lower film 24a Folding part 24b First end part 24c Second end part 24d Notch 30 Pouring outlet part 30a Pouring path 31 First side 32 Second side 33 Scheduled opening part 33a Notch 35 Pouring outlet 41 Sealant layer 42 Base material layer

Claims

1. A bag having a spout portion for pouring out a fluid accommodated therein, a body film folded back to form a first surface and a second surface of the bag opposite to the first surface, a first side portion at least partially including a folded-back portion where the body film is folded back, and a part of the folded-back portion constitutes a first side of the spout portion, the first side portion, a second side portion opposite to the first side portion, an upper portion including an upper seal portion extending at least partially downward as it extends from the side of the first side portion toward the side of the second side portion, and at least a part of the portion of the upper seal portion extending downward constitutes a second side opposite to the first side across the pouring path of the spout portion, the upper portion, a lower film inserted in a folded state between the first surface and the second surface at the lower part of the body film, a lower seal portion including a seal portion where the inner surface of the body film constituting the first surface and the inner surface of the lower film are joined, and a seal portion where the inner surface of the body film constituting the second surface and the inner surface of the lower film are joined, the second side portion includes a second side portion seal portion, a bag, wherein the portion of the upper seal portion extending downward extends from the first side portion to the second side portion.

2. The bag according to claim 1, further comprising a notch or a cut formed in the upper seal portion constituting the second side of the spout portion.

3. The bag according to claim 1 or 2, wherein an angle formed by the direction in which the first side of the spout portion extends and the direction in which the edge portion on the first side of the upper seal portion constituting the second side extends is 10 degrees or more and 90 degrees or less.

Images