JP2015227177A - Method for manufacturing pouch filled with fluid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a pouch that has excellent fill-ability of a content and can cope with various types of pouches.SOLUTION: A method for manufacturing a pouch filled with a content includes: a step of preparing a body part that is formed with a filling part to be filled with the content and has an opening at one end thereof; a filling step of filling the content into the filling part of the body part through the opening; and a closing step of closing the opening of the body part using a closing part consisting of a closing film. The body part comprises at least a surface film and a back film, and the filling part is formed between the surface film and the back film. In the closing step, the closing part is heat welded to the surface film and the back film of the body part.

Description

  The present invention relates to a method of manufacturing a bag filled with contents.

  A bag made of a soft packaging material is used as a bag for containing a fluid having fluidity such as liquid or powder and a content containing a solid such as confectionery. A bag for containing contents generally forms a seal portion such as a side edge seal portion or a bottom edge seal portion by heat-welding a front film and a back film each having an inner surface made of a thermoplastic resin layer. Can be obtained. At this time, normally, the top film and the back film are not thermally welded at the upper part of the bag, thereby forming an opening at the upper part of the bag. Next, the contents are filled into the bag through this opening. Thereafter, the front film and the back film are again heat-welded to each other at the upper portion of the bag, thereby forming an upper edge seal portion at the upper portion of the bag, thereby sealing the bag. In this way, a bag filled with the contents is obtained (for example, see Patent Document 1).

Japanese Patent No. 4659963

  Various additional shapes may be provided on the top of the bag in order to improve the handleability of the bag and the takeout of the contents. For example, in patent document 1, the hole for inserting a finger is provided in the upper part of a bag. Further, when the content is a fluid, an outlet for taking out the fluid may be formed in the upper part of the bag. When such an additional shape is present, the width of the opening formed at the top of the bag for filling the contents is reduced by the width occupied by the additional shape. In this way, in the method of filling the contents using the upper opening and thermally welding the opening after the filling is completed to form the upper edge seal portion, the width of the opening for filling varies. It is subject to restrictions.

  In order to solve such a problem, an opening is formed at the bottom of the bag, the contents are filled using this opening, and the opening is thermally welded after filling to form the bottom edge seal portion. The method of thinking is also conceivable. However, if the front film and the back film are thermally welded to each other at the bottom of the bag in order to close the opening, it is not possible to provide a gusset at the bottom of the bag. A possible bag cannot be formed. Thus, in the method of providing an opening at the bottom, the type of bag is limited.

  The present invention has been made in view of the above points, and has an object to provide a bag manufacturing method that is excellent in filling suitability of contents and can be used for various types of bags. To do.

  The present invention is a method for manufacturing a bag filled with contents, wherein a filling portion filled with the contents is formed and a main body portion having one end opened is prepared, and the contents are provided through the opening. A filling step of filling an object with the filling portion of the main body portion, and a closing step of closing the opening of the main body portion using a closing portion made of a closing film, the main body portion comprising a surface film and Including at least a back film, the filling portion is formed between the surface film and the back film, and in the closing step, the closing portion is thermally welded to the surface film and the back film of the main body portion, It is a manufacturing method of a bag.

  In the bag manufacturing method according to the present invention, the closing part includes a first part located on the side thermally welded to the front film, a second part located on the side thermally welded to the back film, and the first part. A folded portion that is located between the first portion and the second portion and is formed by folding the closing film.

  In the closing step of the bag manufacturing method according to the present invention, the closing portion made of the closing film folded so that the folded portion is convex toward the inside of the main body portion is heated to the main body portion. It may be welded. In this case, the closing portion constitutes a bottom portion of the bag when the bag is self-supporting, and in the closing step, the closing portion includes a pair of side edges of the closing portion. It may be heat-welded to the front film and the back film of the main body so as to be located on the inner side.

  In the closing step of the bag manufacturing method according to the present invention, the closing portion made of the closing film folded so that the folded portion is convex toward the outside of the main body portion is heated to the main body portion. It may be welded. In this case, the content filled in the filling part includes a fluid having fluidity, and the closing part has an outlet part through which the fluid that has flowed along the folded part is taken out to the outside. May be formed. The opening portion may be formed with a scheduled opening portion that becomes an outlet when opened. In this case, the fluid that has flowed along the folded portion is taken out from the outlet.

  In the bag manufacturing method according to the present invention, the main body portion includes a pair of side edge seal portions extending along a pair of side edges, and the closing portion is one side edge of the pair of side edge seal portions. You may be comprised so that it may reach from the seal part to the other side edge seal part.

  In the present invention, the opening of the main body used for filling the contents is closed using a closing portion made of a closing film different from the surface film and the back film constituting the main body. Therefore, compared with the case where the front film and the back film are heat-welded to close the opening of the main body, the closed portion can have various additional shapes and functions. Therefore, since the width of the opening at the time of filling can be ensured widely, it is excellent in the filling ability of the contents, and can correspond to various types of bags.

FIG. 1 is a perspective view showing a bag according to a first embodiment of the present invention. FIG. 2A is a front view of the bag shown in FIG. 1. 2B is an enlarged view of a portion surrounded by a frame IIB in FIG. 2A. FIG. 3 is an exploded view of members constituting the bag shown in FIG. 1. FIG. 4 is a cross-sectional view illustrating an example of a layer configuration of a front surface film and a back surface film of the main body of the bag illustrated in FIG. 1. FIG. 5 is a cross-sectional view showing an example of a layer configuration of a closing film of the closing portion of the bag shown in FIG. 1. 6A to 6D are views showing an example of a method for manufacturing the main body of the bag shown in FIG. 7A to 7C are views showing an example of a method for manufacturing the bag shown in FIG. FIG. 8 is a front view showing a bag according to a comparative embodiment. FIGS. 9A to 9D are views showing an example of a bag manufacturing method according to the first comparative embodiment. FIG. 10 is a front view showing a bag according to a first modification of the first embodiment. FIGS. 11A to 11C are diagrams showing an example of a method for manufacturing the bag shown in FIG. 12A to 12C are diagrams illustrating an example of a bag manufacturing method according to a second modification of the first embodiment. FIG. 13 is a front view showing a bag according to a third modification of the first embodiment. FIG. 14 is a front view showing a bag according to a fourth modification of the first embodiment. FIG. 15 is a cross-sectional view showing the bag shown in FIG. 14 as viewed along line XV-XV. 16A to 16C are views showing an example of a method for manufacturing the bag shown in FIG. FIGS. 17A to 17C are views showing a bag manufacturing method according to a second comparative embodiment. FIG. 18 is a perspective view showing a bag according to the second embodiment of the present invention. 19 is a front view of the bag shown in FIG. 20 is an exploded view of members constituting the bag shown in FIG. 21 is a cross-sectional view showing the bag shown in FIG. 19 as viewed along the line XXI-XXI. 22 is a cross-sectional view showing the bag shown in FIG. 19 as viewed along line XXII-XXII. FIG. 23 is a cross-sectional view showing an example of a layer structure of a closing film of the closing portion of the bag shown in FIG. 24A to 24D are views showing an example of a method for manufacturing the bag shown in FIG. 25 (a) to 25 (d) are views showing a modification of the method for manufacturing the closure part of the bag shown in FIG. FIG. 26 is a cross-sectional view showing a modification of the layer configuration of the closing film of the closing portion of the bag shown in FIG. 27 is a cross-sectional view showing a modified example of the closure portion of the bag shown in FIG. FIG. 28 is a front view showing a bag according to a first modification of the second embodiment. 29 is a cross-sectional view showing a case where the bag shown in FIG. 28 is viewed along the line XXIX-XXIX. 30 is a cross-sectional view showing an example of a layer configuration of a front film and a back film of the main body portion of the bag shown in FIG. FIGS. 31A to 31D are views showing an example of a method for manufacturing the bag shown in FIG. 32 is a cross-sectional view showing a modification of the layer configuration of the front film and the back film of the main body of the bag shown in FIG. FIG. 33 is a front view showing a bag according to a second modification of the second embodiment.

First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 7A to 7C. 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.

Bag FIG. 1 is a perspective view showing an entire bag 1 according to the present embodiment, and FIG. 2A is a front view showing the entire bag 1 according to the present embodiment. In FIG. 1, a perspective view of the bag 1 in a state where the fluid L is filled is shown. On the other hand, FIG. 2A shows a front view of the bag 1 when the presence of the fluid L is ignored. Specifically, in FIG. 2A, it is assumed that the outer surface 30y of the first portion 31 and the outer surface 30y of the second portion 32 of the closing film 30 constituting the closing portion 3 described later are in close contact with each other. A front view of the bag 1 is shown.

  In the present embodiment, an example in which the bag 1 is of a self-supporting type will be described. For example, as shown by an arrow M in FIG. 1, a gusset M is formed at the bottom of the bag 1. That is, the bag 1 is a so-called bottom gusset bag in which a gusset is formed on the bottom edge 23 thereof. In the present specification, the terms “bottom”, “upper”, and “side”, and the terms “vertical direction” and “horizontal direction” refer to the bag 1 It represents the position and direction of the component.

  The bag 1 is provided with a main body 2 having a filling portion S filled with a fluid and having an opening at one end here, and a closing portion 3 attached to cover the opening of the main body 2. . The main body 2 includes a front film 11 and a back film 12 that form a filling portion S therebetween. In the following description and drawings, the front film 11 and the back film 12 constituting the main body 2 have symmetrical shapes unless otherwise specified. That is, the constituent elements of the front film 11 and the constituent elements of the back film 12 are substantially the same. Therefore, in the following description, the shape of the surface film 11 is mainly described, and the description of the shape of the back film 12 is omitted.

  As will be described later, the opening of the main body 2 is formed in a portion of the main body 2 that becomes the bottom edge 23 of the bag 1 when the bag 1 is standing. The opening of the main body 2 is a portion through which the fluid L passes when the fluid L is filled into the filling portion S inside the main body 2 as will be described later. When filling the fluid L, the main body 2 is held so that the opening faces upward, as will be described later. Further, in this specification, the “closing portion” is a member attached to the opening of the main body 2 in order to close the main body 2 after the fluid L is filled in the main body 2. In the present embodiment, an example in which the closing portion 3 constitutes the bottom portion of the bag 1 when the bag 1 is self-supporting will be described. However, the present invention is not limited to this example. For example, in the second embodiment to be described later As will be described, the closing part 3 may constitute the upper part of the bag 1.

  The bag 1 is configured to contain a liquid that is a fluid that can be refilled into a bottle, such as a liquid detergent or shampoo, but may contain fluid powder or granules. That is, the “fluid” is a concept that includes not only a liquid but also a substance or substance group having fluidity such as a large number of powders and granules.

  Moreover, as long as the opening covered with the above-mentioned closure part 3 is formed, the type of the main-body part 2 by this Embodiment is not specifically limited. For example, the main body 2 is formed by bonding the front film 11 and the back film 12 to each other by heat welding or the like. In this case, the main body 2 is divided into a seal part where the front film 11 and the back film 12 are joined and an unsealed part where the front film 11 and the back film 12 are not joined.

  Hereinafter, the main body 2 and the closing part 3 will be described in detail. FIG. 3 is an exploded view of members constituting the bag 1. As shown in FIG. 3, in the present embodiment, the bag 1 is composed of three films: a front film 11, a back film 12, and a closing film 30. Of these, the main body 2 is constituted by the front film 11 and the back film 12, and the closing part 3 is constituted by the closing film 30.

(Main body)
The main body 2 is formed by heat-welding the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12 so that an opening exists in a portion that becomes the bottom edge 23 of the bag 1. In this case, the main body 2 includes a seal portion in which the inner surface 11x of the surface film 11 and the inner surface 12x of the back film 12 are thermally welded, and an unsealed portion in which the surface film 11 and the back film 12 are not thermally welded. It is divided into,. In the present specification, the “inner surface” is a surface on the side facing the fluid L filled in the bag 1. In FIG. 3, the outer surface on the opposite side of the inner surface 11x of the surface film 11 and the outer surface on the opposite side of the inner surface 12x of the back film 12 are denoted by reference numerals 11y and 12y, respectively.

  As shown in FIG. 2A, the seal portion of the main body portion 2 includes a pair of side edge seal portions 22 a that extend along the pair of side edges 22, and an upper edge seal portion 21 a that extends along the upper edge 21. Yes. The filling portion S described above is defined in a space surrounded by the pair of side edge seal portions 22a and the upper edge seal portion 21a. In FIG. 1 and FIG. 2A, the bottom formed by heat welding the inner surface 11x of the surface film 11 and the inner surface 12x of the back film 12 of the main body 2 and the inner surface 30x of the closing film 30 of the closing portion 3. The edge seal portion is represented by reference numeral 23a. The bottom edge seal portion 23 a is a seal portion that is formed to close the opening of the main body portion 2.

  In this specification, for convenience of explanation, a seal portion obtained by heat-welding the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12, such as the side edge seal portion 22a, is referred to as a first type seal. Sometimes referred to as part R1. Further, the seal portion obtained by heat-welding the inner surface 11x of the surface film 11 or the inner surface 12x of the back film 12 and the inner surface 30x of the closing film 30 such as the bottom edge seal portion 23a is a second type seal. It may also be called part R2. Moreover, as shown to FIG. 2A, different hatching may be attached | subjected with respect to a different kind of seal part. In the present embodiment, as shown in FIG. 2A, the side edge seal portion 22 a including the first type seal portion R <b> 1 extends to reach the bottom edge 23 of the bag 1. This can bring about the advantage of maintaining the self-standing state of the bag 1 more stably, as will be described later.

  The main body 2 may be provided with easy-opening means for easily breaking the main body 2 and opening the bag 1. For example, as shown in FIG. 2A, the side edge seal portion 22 a of the main body portion 2 may be formed with a notch 25 serving as a starting point for fracture. 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 main-body part 2 as an easy opening means. Further, a stretched film may be included in the front film 11 or the back film 12 so that the stretched direction of the stretched film and the breaking direction of the main body 2 are matched. The main body 2 may be subjected to printing or the like for indicating the position to be opened to the user of the bag 1.

(Closed part)
Next, the closing part 3 will be described. As shown in FIG. 3, in the present embodiment, the closing portion 3 folds the closing film 30 to form a folded portion 33, and the folded portion 33 is convex toward the inside of the bag 1. By attaching the inner surface 30x of the closing film 30 to the inner surface 11x of the surface film 11 of the main body 2 and the inner surface 12x of the back film 12, the film 30 is attached to the main body 2. Of the closing film 30, a portion located on the side that is thermally welded to the front film 11 is referred to as a first portion 31, and a portion located on the side that is thermally welded to the back film 12 is referred to as a second portion 32. The folded portion 33 is located between the first portion 31 and the second portion 32. Further, the closing portion 3 is configured to extend from one side edge seal portion 22a of the pair of side edge seal portions 22a of the main body portion 2 to the other side edge seal portion 22a. 3 shows an example in which the folded portion 33 is formed as a bent portion by sharply bending the closing film 30, but the present invention is not limited to this, and the folded portion 33 is formed as a curved portion. May be.

  Next, with reference to FIG. 2B, an example of the structure of the bottom edge seal portion 23a at the boundary portion with the side edge seal portion 22a will be described. FIG. 2B is an enlarged view of a portion surrounded by a frame IIB in FIG. 2A. As shown in FIG. 2B, the bottom edge seal portion 23a is a second-type seal portion R2 obtained by thermally welding the inner surface 11x of the front film 11 or the inner surface 12x of the back film 12 and the inner surface 30x of the closing film 30. In addition to the above, the first type seal portion R1 obtained by thermally welding the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12 is positioned at the inner side of the bag 1 than the folded portion 33 of the closing film 30. You may have further. In this case, the portion located on the innermost side of the bag 1 in the bottom edge seal portion 23a is integrally formed with the side edge seal portion 22a as the first type seal portion R1 similarly to the side edge seal portion 22a. become. For this reason, it can suppress that the fluid L leaks from the boundary part of the side edge seal part 22a and the bottom edge seal part 23a.

  In FIG. 2B, the dimension of the first type seal portion R1 of the bottom edge seal portion 23a in the direction orthogonal to the direction in which the side edge seal portion 22a extends, for example, in the horizontal direction is represented by the symbol d. In consideration of sufficiently suppressing the fluid L from leaking from the boundary portion between the side edge seal portion 22a and the bottom edge seal portion 23a, the dimension d is preferably 3 mm or more. For example, the dimension d can be set within a range of 3 to 5 mm.

(the film)
Next, an example of the layer configuration of the front film 11, the back film 12, and the closing film 30 will be described. First, referring to FIG. 4, the layer configuration of the front film 11 and the back film 12 will be described. As shown in FIG. 4, the front film 11 and the back film 12 include a base material layer 52 and a thermoplastic resin layer 51 provided on the base material layer 52. In the example shown in FIG. 4, the base material layer 52 constitutes the outer surfaces 11 y and 12 y of the films 11 and 12, and the thermoplastic resin layer 51 constitutes the inner surfaces 11 x and 12 x of the films 11 and 12. ing. The base material layer 52 may be printed with a pattern or the like.

  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 and 12y. 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 and 12 is in the range of 20 to 250 μm, for example.

  Although not shown, the films 11 and 12 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 metal layer, a vapor deposition layer of metal or metal oxide, or the like can be provided as the intermediate layer. By providing such an intermediate layer, oxygen and water vapor can be prevented from entering the bag 1. A stretched nylon film may be provided as the intermediate layer. In this case, the puncture resistance of the bag 1 can be improved.

  Next, the layer structure of the closing film 30 will be described with reference to FIG. As shown in FIG. 5, the closing film 30 includes a base material layer 57 and a first thermoplastic resin layer 56 provided on one side of the base material layer 57. In the example shown in FIG. 5, the first thermoplastic resin layer 56 constitutes the inner surface 30 x of the closing film 30, and the base material layer 57 constitutes the outer surface 30 y of the closing film 30. As in the case of the front film 11 and the back film 12, the base material layer 57 may be printed with a pattern or the like.

  As a material constituting the base material layer 57, polyethylene terephthalate or the like can be used as in the case of the front film 11 and the back film 12. As the material constituting the first thermoplastic resin layer 56, polyethylene, polypropylene, or the like can be used as in the case of the front film 11 and the back film 12. Similarly to the case of the front film 11 and the back film 12, an intermediate layer may be disposed between the base material layer 57 and the first thermoplastic resin layer 56. The thickness of the closing film 30 is, for example, in the range of 20 to 250 μm.

  In addition, it cannot be overemphasized that the layer structure of the surface film 11, the back surface film 12, and the film 30 for closure is not limited to what was mentioned above.

(Production method)
Next, the manufacturing method of the bag 1 by this Embodiment is demonstrated.

  First, a method for manufacturing the main body 2 will be described with reference to FIGS. First, as shown to Fig.6 (a), the elongate surface film 11 and the back film 12 are prepared. At this time, the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12 are made to face each other. Next, as shown in FIG.6 (b), the surface film 11 and the back film 12 currently conveyed along the longitudinal direction are laminated | stacked. Then, as shown in FIG.6 (c), the inner surface 11x of the surface film 11 and the inner surface 12x of the back film 12 are heat-welded, and 1st type seal | sticker part R1 is formed with a predetermined pattern. At this time, the first type seal portion R <b> 1 is formed so that the unsealed portion that becomes the filling portion S and the opening 2 a is provided at equal intervals along the longitudinal direction of the films 11 and 12. Moreover, 1st type seal | sticker part R1 is formed so that the side edge by which the opening 2a is formed among the side edges of the films 11 and 12 conveyed along a longitudinal direction may be reached.

  Thereafter, as shown in FIG. 6D, the laminate of the surface film 11 and the back film 12 is cut along the first type seal portion R1 according to the interval between the unsealed portions. Thus, including the upper edge seal portion 21a and the pair of side edge seal portions 22a, and the filling portion S surrounded by the upper edge seal portion 21a and the pair of side edge seal portions 22a, the opening 2a is formed at one end. The formed main body 2 can be obtained. As described above, since the first type seal portion R1 is formed so as to reach the side edge on the side where the opening 2a is formed among the side edges of the films 11 and 12, it is shown in FIG. Thus, a pair of side edge seal part 22a of the main-body part 2 is extended to the edge part of the opening 2a.

  Next, a method of manufacturing the bag 1 by filling the main body 2 with the fluid L will be described with reference to FIGS. First, as shown in FIG. 7A, the main body 2 is prepared so that the opening 2a faces upward. At this time, the main body 2 may be held by using a grip G or the like that grips the side edge seal portion 22a. Next, a filling step of filling the fluid L into the filling portion S of the main body 2 from the nozzle of the filling device F through the opening 2a is performed. Here, as described above, the pair of side edge seal portions 22a extends to the end of the opening 2a. Accordingly, the front film 11 and the back film 12 are firmly joined to each other on both sides of the opening 2a even at the end of the opening 2a. For this reason, even if the filling apparatus F contacts the surface film 11 and the back film 12 in a filling process, it can suppress that the films 11 and 12 turn up or deform | transform. Thereby, the filling process using the filling device F can be more easily performed.

  Next, a closing process for closing the opening 2 a of the main body 2 using the closing portion 3 made of the closing film 30 is performed. Specifically, first, as shown in FIG. 7 (b), the closing portion 3 made of the closing film 30 that is folded back so that the folded portion 33 is convex toward the inside of the main body portion 2 is prepared. Next, the closing part 3 is inserted into the opening 2 a of the main body part 2. Here, the closing film 30 constituting the closing portion 3 is configured such that the closing portion 3 can be inserted between the pair of side edge seal portions 22 a of the main body portion 2. Specifically, as shown in FIG. 7B, the width W <b> 1 of the closing film 30 is equal to or less than the distance W <b> 2 between the inner edges of the pair of side edge seal portions 22 a of the main body portion 2.

  Next, as shown in FIG. 7C, the inner surface 30 x of the closing film 30 of the closing portion 3 is thermally welded to the inner surface 11 x of the front film 11 of the main body 2 and the inner surface 12 x of the back film 12. Thereby, the bottom edge seal part 23a for closing the opening 2a of the main body part 2 can be formed. In this way, the bag 1 filled with the fluid L can be manufactured. 2B, at this time, the inner surface 11x of the surface film 11 and the inner surface 12x of the back film 12 are heat-welded at the inner portion of the main body 2 relative to the folded portion 33, whereby the bottom edge The seal portion 23a may include not only the second type seal portion R2 but also the first type seal portion R1.

  According to the present embodiment, the opening 2a of the main body 2 is closed using the closing film 30 different from the films 11 and 12 constituting the main body 2, so that one of the main bodies 2 can be used during the filling process. It is possible to secure the opening 2a from the side edge seal portion 22a to the other side edge seal portion 22a and to provide a gusset at the bottom of the bag 1 formed by closing the opening 2a. That is, it is possible to secure a wide width of the opening 2a during the filling process, thereby realizing various types of bags 1 while realizing good filling suitability of the fluid. For this reason, various types can be manufactured by a simple and stable method.

First Comparison Mode Next, the effect of the present embodiment will be described in comparison with the first comparison mode. FIG. 8 is a front view showing the bag 100 in the first comparative embodiment. Moreover, Fig.9 (a)-(d) is a figure which shows the method of manufacturing the bag 100 shown in FIG. In the first comparative embodiment shown in FIG. 8 and FIGS. 9A to 9D, the same reference numerals are given to the same parts as those in the first embodiment described above, and the detailed description is omitted.

  In the bag 100 according to the first comparative embodiment, first, as shown in FIG. 9A, a long film 130 for forming the bottom of the bag 100 is prepared. Next, as shown in FIG. 9 (b), the film 130 was folded along the folded portion 133, and then folded between the front film 11 and the back film 12, as shown in FIG. 9 (c). Insert the film 130. Then, as shown in FIG.9 (d), the surface film 11 and the back surface film 12 are heat-welded, and also the surface film 11, the back surface film 12, and the film 130 are heat-welded, and the bottom edge seal part 123a is formed. To do. Thereafter, the laminate shown in FIG. 9 (d) is cut to produce the main body portion 2, the main body portion 2 is filled with a fluid, and the upper portion of the main body portion 2 is sealed by thermal welding, thereby FIG. The bag 100 shown in FIG.

  As described above, in the first comparative embodiment, the long film 130 for constituting the bottom portion of the bag 100 is laminated on the surface film 11 and the back film 12 constituting the main body portion 2 and thermally welded. The front film 11 and the back film 12 are cut together. In this case, the position of the side edge of the film 130 necessarily coincides with the position of the side edge of the front film 11 and the side edge of the back film 12. This means that the side edge seal portion 22a formed of the first type seal portion R1 is interrupted at the folded portion 133 of the film 130 as shown in FIG. For this reason, in the bag 100 manufactured by the method according to the first comparative embodiment, the surface film 11 and the back film 12 are not joined at the portion of the side edge 22 that overlaps the film 130, and as a result, The self-standing state of the bag 100 becomes unstable. Further, when the bag 100 is dropped, bag breakage may occur starting from a portion where the inner edge of the bottom edge seal portion 123a and the inner edge of the side edge seal portion 22a intersect. In order to solve such a problem, in the bag 100 manufactured by the method according to the first comparative embodiment, as shown in FIG. 8, a notch 130y is formed in a portion along the side edge 22 of the film 130. It is conceivable that the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12 are partially thermally welded through the notch 130y. On the other hand, in this case, as shown in FIG. 9A, a hole 130z is formed in a portion of the film 130 to be transported later which becomes a notch 130y. The rigidity is lowered, and as a result, the film 130 is easily stretched during conveyance. In general, in a self-supporting bag, a film having high flexibility tends to be adopted as the film 130 for constituting the bottom so that the impact received by the bag when the bag falls can be absorbed. is there. This further promotes the elongation of the film 130 that may occur during transport.

  When the hole 130z is provided in the film 130, in the manufacturing process of the bag 100, a step of forming the hole 130z in the film 130 by punching or the like is performed. For this reason, it is considered that the punching residue generated when forming the hole 130z is likely to be mixed into the production line, and as a result, process defects are likely to occur.

  Moreover, even if the surface film 11 and the back surface film 12 are partially heat-welded through the notch 130y as described above and the first type seal portion R1 is thereby formed, as shown in FIG. The seed seal portion R1 is not formed over the entire side edge 22. Accordingly, there is a portion where the surface film 11 and the back film 12 are separated from each other in the vicinity of the bottom, and the self-supporting state may be insufficient.

  On the other hand, according to the present embodiment, as described above, the opening 2a of the main body 2 used to fill the fluid L is formed by the surface film 11 and the back film 12 constituting the main body 2. Is closed by a closing part 30 consisting of another closing film 30. The closing part 30 is inserted between the front film 11 and the back film 12 after the front film 11 and the back film 12 are thermally welded to form the side edge seal part 22a. For this reason, it is possible to position the side edge of the film 30 for closure which comprises the closure part 3 inside the side edge of the surface film 11 and the back film 12. Therefore, as shown in FIG. 2A, the side edge seal portion 22 a composed of the first type seal portion R <b> 1 can be formed so as to extend to the bottom edge 23 of the bag 1. For this reason, the self-supporting state of the bag 1 can be maintained more stably. Moreover, since it is not necessary to form a hole in the closing film 30, a process failure due to the punching residue does not occur. Further, even when the closing film 30 is transported at a predetermined tension along the longitudinal direction, the closing film 30 is not provided with holes, so that the closing film 30 is prevented from extending. can do.

  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.

(First modification)
In the above-described embodiment, an example in which the closing film 30 has a width W1 equal to or less than the distance W2 between the inner edges of the pair of side edge seal portions 22a of the main body portion 2 has been shown. However, the present invention is not limited to this, and as shown in FIG. 10, the distance W2 is larger than the distance W2 between the inner edges of the pair of side edge seal portions 22a of the main body 2 and the pair of side edges 22 of the main body 2 are The closing portion 3 may be configured using a closing film 30 having a width W1 smaller than the distance W3 therebetween.

  A method for manufacturing the bag 1 shown in FIG. 10 will be described with reference to FIGS. First, as shown in FIG. 11A, a main body 2 having an opening 2a formed at one end is prepared. Here, the pair of side edge seal portions 22a of the main body 2 is formed so as not to reach one end (the rear bottom edge 23) provided with the opening 2a. The fluid L is filled into the filling portion S of the main body 2 from the nozzle of the filling device F through the opening 2 a of the main body 2. Next, as shown in FIG. 11 (b), the distance W 2 is larger than the distance W 2 between the inner edges of the pair of side edge seal portions 22 a of the main body 2 and the distance W 3 between the pair of side edges 22 of the main body 2. The closing part 3 made of the closing film 30 having a smaller width W1 is prepared. Thereafter, the closing portion 3 is inserted between the pair of side edge seal portions 22 a of the main body portion 2. At this time, since the pair of side edge seal portions 22a of the main body portion 2 does not reach one end where the opening 2a is provided, the closing portion 3 can be inserted into the main body portion 2 more easily. Next, the inner surface 30x of the closing film 30 of the closing portion 3 is thermally welded to the inner surface 11x of the surface film 11 of the main body portion 2 and the inner surface 12x of the back film 12. Thus, as shown in FIG. 11C, the second type seal portion R2 constituting the bottom edge seal portion 23a can be formed. At this time, as shown in FIG. 11C, the first type seal portion R1 constituting the portion extending to the bottom edge 23 of the side edge seal portion 22a is formed on the side of the second type seal portion R2. You can also

  Also in this modification, the side edge of the closing film 30 constituting the closing part 3 can be positioned inside the side edge of the front film 11 and the side edge of the back film 12. Therefore, as shown in FIG. 10, the side edge seal portion 22 a formed of the first type seal portion R <b> 1 can be formed so as to extend to the bottom edge 23 of the bag 1. For this reason, the self-supporting state of the bag 1 can be maintained more stably. Also in this modification, as in the case of the first embodiment described above, the width of the opening 2a in the filling process is ensured wide, thereby realizing good filling suitability of the fluid, and Various types of bags 1 can be realized.

(Second modification)
In the first modified example described above, the distance W2 is larger than the distance W2 between the inner edges of the pair of side edge seal portions 22a of the main body 2 and is smaller than the distance W3 between the pair of side edges 22 of the main body 2. The example in which the closing part 3 is comprised using the film 30 for closure which has the width W1 was shown. However, the present invention is not limited to this, and the closing film 30 may have the same width W1 as the distance W3 between the pair of side edges 22 of the main body 2. FIGS. 12A to 12C show a manufacturing method of the bag 1 when the width W1 of the closing film 30 is the same as the distance W3 between the pair of side edges 22 of the main body 2. FIG.

  Also in this modified example, as in the case of the first embodiment described above, the width of the opening 2a in the filling process is secured wide, thereby realizing good filling suitability of the fluid, and Various types of bags 1 can be realized. Although not shown, the closing film 30 constituting the closing portion 3 according to the present modification may be provided with a notch 130y similar to the case of the first comparative embodiment described above. In this case, the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12 can be partially thermally welded through the notch 130y, so that the stability of the bag 1 in a self-supporting state can be enhanced.

(Third Modification)
In the above-described embodiment, an example in which the bag 1 is opened by breaking the main body 2 along a direction substantially parallel to the upper edge 21 and the fluid L is taken out has been described. However, the method for taking out the fluid L from the bag 1 is not particularly limited. For example, as shown in FIG. 13, an outlet 50 for taking out the fluid L may be provided in the upper part of the main body 2 of the bag 1. The take-out port 50 is a portion provided to adjust the flow of the fluid L when the fluid L is taken out from the bag 1, and has a narrower width w than the filling portion S. Moreover, the opening part 50 may be formed with a scheduled opening part 35 that becomes an outlet 34 for taking out the fluid by being opened. The unscheduled opening portion 35 may be provided with easy-opening means such as a half cut line formed by laser processing or a cutter in order to facilitate opening. Moreover, a stretched film is included in the front film 11 and the back film 12, and the stretched direction of the stretched film and the direction of the planned opening portion 35 are made to coincide with each other, thereby breaking the bag 1 along the planned opening portion 35. It may be facilitated. Moreover, the printing etc. which show the position which should be opened to the user of the bag 1 may be given to the scheduled opening part 35. FIG.

  In the example shown in FIG. 13, the flow path of the fluid L in the outlet 50 is formed between a pair of seal portions 36 that extend along the direction in which the fluid L is extracted. The seal portion 36 is formed by thermally welding the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12, that is, as the first type seal portion R1. As shown in FIG. 13, a cutout 37 for adjusting the shape of the outlet portion 50 may be formed in the outlet portion 50 on the side of the seal portion 36.

(Fourth modification)
As shown in FIG. 14, a chuck tape 45 extending from one side edge seal portion 22 a to the other side edge seal portion 22 a may be provided inside the main body portion 2. The chuck tape 45 is a member provided to re-seal the main body 2 of the bag 1 after being broken and opened along the easy opening means such as the notch 25.

  FIG. 15 is a cross-sectional view showing a case where the bag 1 shown in FIG. 14 is viewed along line XV-XV. As shown in FIG. 15, the chuck tape 45 includes a male member 46 attached to the inner surface 11 x of the surface film 11 and a female member 47 attached to the inner surface 12 x of the back film 12 so as to face the male member 46. And. The male member 46 and the female member 47 are configured to be fitted to each other. In this case, the filling member S of the main body 2 of the bag 1 after opening can be sealed again by fitting the male member 46 and the female member 47 together. Further, the fluid L in the filling portion S can be taken out by removing the fitting between the male member 46 and the female member 47. Although not shown, the male member 46 may be attached to the back film 12 and the female member 47 may be attached to the front film 11.

  As shown in FIG. 15, the inner surface 11 x of the front film 11 and the inner surface 12 x of the back film 12 can be brought into close contact with the portion of the inside of the main body 2 that is closer to the bottom than the chuck tape 45 as necessary. Easy peel means 48 may be provided. By bringing the front film 11 and the back film 12 into close contact with each other on the bottom side of the chuck tape 45, it is possible to suppress the fluid L from coming into contact with the chuck tape 45. As a result, it is possible to prevent the sealing performance of the chuck tape 45 from becoming insufficient due to the presence of a fluid between the male member 46 and the female member 47, for example. Also, by providing the easy peel means 48, it is possible to more reliably suppress the fluid from reaching the periphery of the easy opening means such as the notch 25 beyond the chuck tape 45. Thereby, when a user opens the bag 1, it can suppress that a fluid adheres to a user's hand. The specific configuration of the easy peel means 48 is not particularly limited, and a known one can be used as appropriate. For example, as shown in FIG. 15, the easy peel means 48 may include an easy peel film 49 provided on one or both of the inner surfaces 11 x and 12 x of the films 11 and 12.

  A method for manufacturing the bag 1 shown in FIG. 14 will be described with reference to FIGS. First, as shown in FIG. 16 (a), a main body 2 is prepared in which an opening 2a is formed at one end, which will later become a bottom edge, and a chuck tape 45 is provided on the upper edge 21 side. At this time, the male member 46 and the female member 47 of the chuck tape 45 are in a state of being fitted to each other. More specifically, in the chuck tape 45 in the state shown in FIG. 16 (a), the male member 46 and the female member 47 are still fitted once after the chuck tape 45 is attached to the films 11 and 12. Is not removed. For this reason, no fluid exists between the male member 46 and the female member 47 of the chuck tape 45. That is, the chuck tape 45 is kept in a state where high sealing performance can be exhibited.

  As shown in FIG. 16B, the fluid L is filled into the filling portion S of the main body 2 through the nozzle 2 of the filling device F through the opening 2 a of the main body 2. Next, as shown in FIG. 16 (c), the closing portion 3 is inserted between the pair of side edge seal portions 22 a of the main body portion 2, the closing portion 3 is thermally welded to the main body portion 2, and the opening 2 a is closed. To do.

  According to this modification, the fluid L can be filled in the main body 2 and the opening 2a of the main body 2 can be closed without removing the fitting between the male member 46 and the female member 47. . For this reason, the bag 1 which has the chuck tape 45 maintained in the state which can exhibit high sealing performance can be manufactured. Moreover, according to this modification, since the opening 2a of the main-body part 2 is closed using the closing film 30 different from the films 11 and 12 which comprise the main-body part 2, the bag formed by closing the opening 2a A gusset can be provided at the bottom of one. That is, it is possible to provide a bottom gusset type self-supporting bag 1 having a chuck tape 45 maintained in a state where high sealing performance can be exhibited.

Second Comparison Mode Next, the effect of the above-described fourth modification will be described in comparison with the second comparison mode. FIGS. 17A to 17C are diagrams showing a bag manufacturing method according to the second comparative embodiment.

  As shown in FIG. 17 (a), in the second comparative embodiment, a main body 2 is prepared in which an opening 2a is formed at one end which will later become an upper edge and a chuck tape 45 is provided on the upper edge 21 side. To do. Under the present circumstances, the bottom edge side of the main-body part 2 is sealed by the bottom edge seal part 123a.

  Next, as shown in FIG. 17 (b), the fluid L is filled into the filling portion S of the main body portion 2 from the nozzle of the filling device F through the opening 2 a. At this time, the male member 46 and the female member 47 of the chuck tape 45 are disengaged so that the fluid L can reach the filling portion S. After the filling is completed, the male member 46 and the female member 47 of the chuck tape 45 are fitted to each other, and as shown in FIG. 21a is formed.

  According to the second modification, the fluid L is filled into the filling portion S through the opening 2a formed at one end which later becomes the upper edge. The fluid L passes between the male member 46 and the female member 47 of the chuck tape 45 and reaches the filling portion S. For this reason, it is considered that a fluid adheres between the male member 46 and the female member 47 during the filling process, and thereby the sealing performance of the chuck tape 45 becomes insufficient. In addition, it is conceivable that the fluid adheres to the inner surface of the front film 11 and the inner surface of the back film 12 in the region between the opening 2 a and the chuck tape 45 during the filling step. In this case, when the user later opens the bag, the user's hand comes in contact with the inner surface of the surface film 11 or the inner surface of the back film 12, and the fluid may adhere to the user's hand. Conceivable. Further, before the filling step, the male member 46 and the female member 47 of the chuck tape 45 are disengaged, and after the filling step, the male member 46 and the female member 47 of the chuck tape 45 are fitted. It is also necessary to combine them.

  On the other hand, according to the above-described fourth modified example, the male member 46 and the female member 47 of the chuck tape 45 are fitted to each other via the opening 2a formed at one end which becomes the bottom edge later. Thus, the fluid is filled in the filling portion S of the main body 2. For this reason, a fluid does not adhere between the male mold member 46 and the female mold member 47 in the filling step. Therefore, the sealing performance of the chuck tape 45 can be sufficiently exhibited. Further, during the filling process, the fluid does not adhere to the inner surface of the front film 11 or the inner surface of the back film 12 between the portion of the bag 1 to be opened later and the chuck tape 45. Therefore, the area | region which a user's hand may contact among the inner surface of the surface film 11 and the inner surface of the back film 12 can be kept clean. For this reason, when a user opens a bag later, even if a user's hand contacts the inner surface of the surface film 11 and the inner surface of the back surface film 12, it suppresses that a user's hand gets dirty with a fluid. be able to. In addition, the work of removing or re-fitting the male member 46 and the female member 47 of the chuck tape 45 before and after the filling process is unnecessary, so that the productivity of the bag 1 can be improved. . Further, when the easy peel means 48 is provided, the fluid does not adhere to the inner surface of the easy peel film 49, so that seal failure can be suppressed.

(Other variations)
In the above-described first embodiment and each modified example, the example in which the content filled in the filling portion S of the main body 2 is a fluid having fluidity is shown. However, the contents filled in the filling part S of the main body part 2 are not particularly limited. For example, in the above-described first embodiment and the first, second, and fourth modified examples, the contents filled in the filling portion S of the main body 2 are solid bodies such as confectionery. Also good.

  In addition, although the some modification with respect to 1st Embodiment mentioned above has been demonstrated, naturally, it is also possible to apply combining several modifications suitably.

Second Embodiment In the above-described first embodiment and its modification, the closing portion 3 made of the closing film 30 used for closing the opening 2a of the main body 2 is provided at the bottom of the bag 1. The example which comprises is shown. However, the present invention is not limited to this, and the closing portion 3 may constitute the upper portion of the bag 1. Hereinafter, a second embodiment of the present invention in which the closing portion 3 constitutes the upper portion of the bag 1 will be described with reference to FIGS. In the second embodiment, the same parts as those in the first embodiment and the modifications thereof are denoted by the same reference numerals, and detailed description thereof is omitted. In addition, when it is clear that the operational effects obtained in the first embodiment and its modifications can be obtained in the present embodiment, the description thereof may be omitted.

Bag FIG. 18 is a perspective view showing the entire bag 1 according to the present embodiment, and FIG. 19 is a front view showing the entire bag 1 according to the present embodiment. The bag 1 is attached so that a filling portion S filled with a fluid is formed between the front film 11 and the back film 12 and covers the main body 2 having an upper end opened here and the opening of the main body 2. And a closing portion 3 made of the closing film 30 provided. In FIG. 18, a state in which the filling part S is filled with the fluid L is shown.

  Also in the present embodiment, an example in which the bag 1 is of a self-supporting type will be described as in the case of the first embodiment described above. For example, as indicated by an arrow M in FIG. 18, a gusset M is formed at the bottom of the bag 1. That is, the bag 1 is a so-called bottom gusset bag in which a gusset is formed on the bottom edge 23 thereof.

  Hereinafter, the main body 2 and the closing part 3 will be described in detail. FIG. 20 is an exploded view of members constituting the bag 1. As shown in FIG. 20, in the present embodiment, the bag 1 is composed of four films: a front film 11, a back film 12, a bottom film, and a closing film 30. Of these, the main body 2 is constituted by the front film 11, the back film 12 and the bottom film 13, and the closing part 3 is constituted by the closing film 30.

(Main body)
The main body 2 is formed by heat-welding the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12 so that an opening exists in the upper portion of the bag 1. In addition, as shown in FIG. 20, the bottom film 13 folded so that the folded portion 13 c is convex toward the inside of the main body 2 is inserted between the surface film 11 and the back film 12, and the surface film 11 And the back film 12 and the bottom film 13 are heat-welded to form the bottom edge seal portion 23a, so that a gusset is formed at the bottom of the bag 1, thereby enabling the bag 1 to stand on its own. The bottom film 13 is different from the closing film 30 in the first embodiment described above, and has already been subjected to the surface film 11 and the back film in the filling step of filling the fluid L into the filling part S of the main body 2. 12 is heat-sealed. That is, the bottom film 13 in the present embodiment is not intended to close the opening of the main body 2 that is used to fill the fluid L in the filling portion S of the main body 2.

  The method for forming the bottom edge seal portion 23a to be the bottom of the bag 1 is not particularly limited, and various methods can be employed. For example, as in the case of the first embodiment described above, first, a laminate in which the surface film 11 and the back film 12 are thermally welded to each other is prepared, and then between the surface film 11 and the back film 12. The bottom edge seal portion 23 a may be formed by inserting the bottom film 13 and thermally welding the bottom film 13 to the front film 11 and the back film 12. Alternatively, as in the case of the above-described comparative embodiment, the bottom surface seal portion is formed by laminating the long surface film 11, the back film 12, and the bottom film 13 and thermally bonding them together and then cutting them. It is also possible to obtain the main body 2 in which 23a is formed. In addition, when it is not necessary to provide a gusset in the bottom part of the bag 1, you may form the bottom edge seal part 23a used as the bottom part of the bag 1 by heat-welding the surface film 11 and the back surface film 12. FIG.

(Closed part)
Next, the closing part 3 will be described. As shown in FIG. 20, in the present embodiment, the closing portion 3 folds the closing film 30 to form a folded portion 33, and the folded portion 33 is convex toward the outside of the bag 1. The outer surface 30 y of the closing film 30 is attached to the main body 2 by thermally welding the inner surface 11 x of the front film 11 of the main body 2 and the inner surface 12 x of the back film 12. In this embodiment, an example in which the folded portion 33 is formed as a curved portion will be described. However, the present invention is not limited to this, and the folded portion 33 is formed as a bent portion by bending the closing film 30 sharply. May be. As in the case of the first embodiment described above, the closing portion 3 extends from one side edge seal portion 22a of the pair of side edge seal portions 22a of the main body portion 2 to the other side edge seal portion 22a. It is configured as follows.

  As shown in FIGS. 18 and 19, the closing film 30 may be formed with an outlet portion 50 having a planned opening portion 35 that becomes an outlet 34 for taking out the fluid when opened. A fluid that has flowed along the folded portion 33 is taken out from the outlet 34. The outlet 34 is indicated by a broken line for convenience of explanation. Further, FIG. 20 shows the closing film 30 before being attached to the main body 2 and before the outlet 50 is formed. The closing film 30 shown in FIG. 20 is a rectangular film simply folded back. In the present embodiment, as will be described later, when the closing film 30 shown in FIG. An outlet 50 having the planned portion 35 is formed.

  The take-out port 50 is a portion provided for adjusting the flow of the fluid L when the fluid L is taken out from the bag 1, and has a narrower width w than the main body 2. As long as the flow of the fluid L can be adjusted, the specific shape of the outlet 50 is not particularly limited. As an example, as shown in FIG. 19, the inner surface 30x of the first portion 31 and the inner surface 30x of the second portion 32 are provided on one side portion 30A of the pair of side portions 30A and 30B of the closing film. A seal portion 36 formed by heat welding is provided. The seal portion 36 is configured such that the distance between the seal portion 36 and the folded portion 33 becomes narrower toward the side. The first portion 31 and the first portion 31 located between the seal portion 36 formed in this way, the portion on the seal portion 36 side of the folded portion 33, and the portion on the seal portion 36 side of the seal portion 36 and the folded portion 33. The two portions 32 constitute an outlet portion 50. In the following description, the direction from the main body 2 side toward the corner portion of the closing film 30 where the seal portion 36 and the folded portion 33 intersect is also referred to as the fluid L extraction direction.

  The unscheduled opening portion 35 of the take-out port portion 50 extends from the seal portion 36 toward the folded portion 33 so as to intersect the take-out direction of the fluid L. By breaking the closing portion 3 along the planned opening portion 35, an outlet 34 for taking out the fluid L is formed in the closing portion 3. From the outlet 34, for example, when the bag 1 is tilted, the fluid rectified by passing through a flow path having a width w smaller than the width of the main body 2, which is defined by the outlet 50. It can be taken out. As shown in FIG. 19, a cutout 37 may be formed in the seal portion 36.

  The unscheduled opening part 35 may be provided with easy-opening means for easily opening the unscheduled opening part 35. For example, the planned opening portion 35 may be formed as an easy-opening line 38 that extends from the seal portion 36 toward the folded portion 33 so as to intersect the fluid take-out direction. As an example of the easy-open line 38, a half-cut line formed by laser processing, a cutter, or the like can be given. Further, a notch may be formed at the edge of the seal portion 36 as an easy-opening means. Further, a stretched film may be included in the front film 11 or the back film 12 so that the stretched direction of the stretched film matches the direction of the opening scheduled portion 35. Moreover, the printing etc. which show the position which should be opened to the user of the bag 1 may be given to the scheduled opening part 35. FIG.

  Next, the cross-sectional structure of the closing part 3 will be described. First, the cross-sectional structure of the portion attached to the main body portion 2 in the closing portion 3 will be described. FIG. 21 shows a cross section taken along line XXI-XXI in FIG. As shown in FIG. 21, in the present embodiment, the first portion 31 and the second portion 32 of the closing film 30 each extend linearly within the main body portion 2, and the respective end portions of the main body portion 2. It arrange | positions between the surface film 11 and the back surface film 12 through opening. A part of the outer surface 30 y of the first part 31 is thermally welded to the inner surface 11 x of the surface film 11, and a part of the outer surface 30 y of the second part 32 is thermally welded to the inner surface 12 x of the back film 12. Thereby, the closing film 30 is attached to the main body 2. In the following description, the inner surface 11x of the surface film 11 or the inner surface 12x of the back film 12 and the closing film 30 such as a seal portion formed when the closing film 30 according to the present embodiment is attached to the main body 2. A seal portion obtained by heat welding the outer surface 30y may be referred to as a third type seal portion R3. As shown in FIG. 19, the third type seal portion R3 extends from one side edge seal portion 22a to the other side edge seal portion 22a. Moreover, the seal part obtained by heat-welding the inner surfaces 30x of the closing film 30 such as the above-described seal part 36 may be referred to as a fourth type seal part R4.

  Next, the cross-sectional structure of the portion of the closing portion 3 where the outlet 50 is formed will be described. FIG. 22 shows a cross section taken along line XXII-XXII in FIG. As shown in FIG. 22, in the planned opening portion 35, the inner surface 30 x of the closing film 30 is thermally welded to form a substantially elliptical cross-sectional shape as a whole. The folded portion 33 of the closing film 30 has an arcuate cross-sectional shape. As shown in FIG. 21, also in the part attached to the main-body part 2 among the closure parts 3, the folding | turning part 33 of the film 30 for closure has an arc-shaped cross-sectional shape curved with the curvature radius r1. That is, in this Embodiment, the film | membrane 30 for closure has the circular arc shape by sectional view 33 over the whole.

  Next, the detail of attachment with respect to the main-body part 2 of the film 30 for closure is demonstrated below. As shown in FIGS. 18 and 19, in the present embodiment, the closing film 30 has one side portion 30 </ b> A where the outlet portion 50 is formed as a side portion on the opposite side (hereinafter, the other side portion). (Also referred to as “30B”). The folded portion 33 gradually extends away from the opening of the main body 2 as it goes from the other side 30B to the one side 30A.

  In this state, one side portion 30 </ b> A of the closing film 30 is in a state in which a base end portion (an end portion on the main body portion 2 side) enters the inside of the main body portion 2, The other side part 30 </ b> B is in a state where the entire side part 30 </ b> B enters the inside of the main body part 2.

  In this example, the front film 11 and the back film 12 are thermally welded at the end of the side edge 22 of the main body 2 on the side where the one side 30A of the closing film 30 is located. The base end portion of one side portion 30 </ b> A of the closing film 30 is disposed between the front film 11 and the back film 12 that are not thermally welded. On the other hand, the side edge seal portion 22 a on the side where the other side portion 30 </ b> B of the closing film 30 is located is formed from the bottom edge 23 to the upper edge 21. And the other side part 30B of the film 30 for closure is arrange | positioned inside the side edge seal part 22a of the side in which the said other side part 30B is located (filling part S side), The whole is the main-body part 2. It is supposed to be inside.

(the film)
Next, an example of the layer configuration of the closing film 30 in the present embodiment will be described. In addition, since the layer structure of the surface film 11 and the back film 12 is the same as the case of the above-mentioned 1st Embodiment, description is abbreviate | omitted. As shown in FIG. 23, the closing film 30 is provided on the base layer 57, the first thermoplastic resin layer 56 provided on one side of the base layer 57, and the other side of the base layer 57. Second thermoplastic resin layer 58 formed. In the example shown in FIG. 23, the first thermoplastic resin layer 56 constitutes the inner surface 30x of the closing film 30 and the second thermoplastic resin layer 58 constitutes the outer surface 30y of the closing film 30. Yes. The above-described third type seal portion R3 is configured by thermally welding the outer surface 30y of the closing film 30 and the inner surfaces 11x and 12x of the films 11 and 12, respectively.

  As a material constituting the base material layer 57, polyethylene terephthalate, nylon, or the like can be used as in the case of the front film 11 and the back film 12. As a material constituting the first thermoplastic resin layer 56 and the second thermoplastic resin layer 58, polyethylene, polypropylene, or the like can be used as in the case of the front film 11 and the back film 12. Further, as in the case of the front film 11 and the back film 12, between the base material layer 57 and the first thermoplastic resin layer 56 and / or between the base material layer 57 and the second thermoplastic resin layer 58. An intermediate layer may be disposed on the substrate. The thickness of the closing film 30 is, for example, in the range of 30 to 200 μm.

  In addition, it cannot be overemphasized that the layer structure of the surface film 11, the back surface film 12, and the film 30 for closure is not limited to what was mentioned above.

(Production method)
Next, the manufacturing method of the bag 1 according to the present embodiment will be described with reference to FIG.

  First, as shown in FIG. 24A, the main body 2 is prepared so that the opening 2a faces upward. At this time, the main body 2 may be held by using a grip G or the like that grips the side edge seal portion 22a. Next, a filling step of filling the fluid L into the filling portion S of the main body 2 from the nozzle of the filling device F through the opening 2a is performed. Here, as shown in FIG. 24A, the opening 2a extends from one of the pair of side edge seal portions 22a to the other. That is, the width of the opening 2a during the filling process is secured wide. Therefore, the filling process can be easily performed. For example, the filling device F can be easily inserted into the opening 2a. Alternatively, the fluid L ejected from the filling device F can be easily passed through the opening 2a.

  Next, a closing process for closing the opening 2 a of the main body 2 using the closing portion 3 made of the closing film 30 is performed. Specifically, first, as shown in FIG. 24 (b), the closing portion 3 made of the closing film 30 is prepared in which the folded portion 33 is folded back so as to be convex upward here. Next, as shown in FIG. 24C, the closing portion 3 is inserted into the opening 2 a of the main body portion 2. Thereafter, the outer surface 30y of the closing film 30 and the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12 are thermally welded.

  Incidentally, as described above, the inner surface 30 x of the closing film 30 is constituted by the first thermoplastic resin layer 56. For this reason, when heating the closing film 30 in order to thermally weld the outer surface 30y of the closing film 30 to the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12, the outer surface 30y of the closing film 30 is configured. It is considered that not only the second thermoplastic resin layer 58 but also the first thermoplastic resin layer 56 constituting the inner surface 30x of the closing film 30 is melted. When the first thermoplastic resin layer 56 is melted and the inner surface 30x of the first portion 31 and the inner surface 30x of the second portion 32 of the closing film 30 are thermally welded, the main body portion 2 and the outlet portion 50 are moved. The flow path of the fluid L that reaches is blocked or suppressed. Considering this point, as shown in FIG. 24C, the separator SE is disposed between the opposing inner surfaces 30 x of the closing film 30. In this state, thermal welding between the first portion 31 and the front film 11 in the closing film 30 and thermal welding between the second portion 32 and the back film 12 are performed. Thus, as shown in FIG. 24D, the closing film 30 is attached to the main body 2 while preventing the inner surface 30x of the first portion 31 and the inner surface 30x of the second portion 32 from being thermally welded. Can do.

  Further, a heat welding step is further performed on the closing film 30 attached to the main body 2 to form a seal portion 36 composed of a fourth type seal portion R4 for constituting the outlet portion 50. The seal portion 36 may be formed at the same time when the third type seal portion R3 is formed. After forming the seal portion 36, a notch 37 may be formed to adjust the shape of the outlet portion 50. Alternatively, the notch 37 may be formed in advance in the closing film 30 before being attached to the main body 2.

  By the way, in the conventional bag, for example, as shown in FIG. 13 described above, the flow path of the fluid L in the outlet 50 is formed between a pair of seal portions 36 extending along the direction in which the fluid L is taken out. Is done. As described above, the seal portion 36 is formed as a first-type seal portion R1 obtained by thermally welding the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12.

  In the bag comprised from the flexible packaging material, the flow path of the fluid L in the outlet 50 is ensured by the gap between the front film 11 and the back film 12 being expanded by the pressure from the fluid L. . In addition, the presence of the fluid L inside the outlet portion 50 increases the rigidity of the outlet portion 50 when the fluid L is taken out. On the other hand, in the bag 100 as shown in FIG. 13, since the surface film 11 and the back film 12 are fixed to each other on both sides of the flow path of the fluid L in the outlet 50, The space between the front film 11 and the back film 12 is difficult to spread. That is, the flow path of the fluid L in the outlet 50 cannot be secured sufficiently large. This means that when the fluid L is taken out, the amount of the fluid L located in the outlet 50 is small, and therefore it is difficult to ensure sufficient rigidity of the outlet 50. It is conceivable that the outlet 50 is closed during the extraction of the fluid L, or the outlet is bent during the extraction of the fluid.

  On the other hand, in the present embodiment, the outlet portion 50 is formed in the closing portion 3 made of the closing film 30 attached to close the opening 2a of the main body portion 2. The outlet 50 is formed between the folded portion 33 and the seal 36 instead of between the pair of seals. The folded portion 33 is a portion formed by folding the closing film 30. Accordingly, in the folded portion 33, the inner surface 30 x of the first portion 31 of the closing film 30 and the inner surface 30 x of the second portion 32 are in close contact with each other. Not done. For this reason, in this Embodiment, as shown in FIG. 21, the folding | returning part 33 can be formed as a curved part. For example, the curved portion may be arcuate as a whole or U-shaped. In any case, the folded portion 33 has an arc shape having a predetermined radius of curvature.

  As described above, in the present embodiment, the folding portion 33 is included in the outlet portion 50, so that the closing film 30 of the closing film 30 is compared with the case where the outlet portion 50 is formed between the pair of seal portions 36. It becomes difficult for the first portion 31 and the second portion 32 to adhere to each other. That is, in the take-out port 50, the distance between the inner surface 30x of the first portion 31 and the inner surface 30x of the second portion 32 can be maintained wide. Accordingly, it is possible to secure a sufficiently large flow path for the fluid L in the outlet 50, so that a large amount of the fluid L is present in the outlet 50 when the fluid L is taken out. be able to. Thereby, the rigidity of the outlet 50 can be sufficiently ensured, and this can prevent the outlet 50 from being blocked during the extraction of the fluid L. Moreover, it can suppress that the outlet part 50 bends in the middle of taking out the fluid L.

  Further, in the present embodiment, as shown in FIG. 19, the upper edge 21 of the bag 1 is constituted by a folded portion 33 of the closing film 30, and the folded portion 33 extends to the outlet 50. For this reason, compared with the case where the upper edge of the bag 1 is formed by the seal portion, for example, the first type seal portion R1, the distance between the opposing films can be maintained wide. Thereby, the flow path of the fluid L at the upper edge of the bag 1 can be secured widely, and therefore, when the bag 1 is tilted, the fluid L that has reached the upper edge of the bag 1 from the filling portion S Smooth guidance toward the outlet 50 can be achieved. In addition, by increasing the length of the upper edge 21 of the bag 1 formed by the folded portion 33 of the closing film 30, a sufficient amount of the fluid L can be stored along the upper edge of the bag 1. it can. For this reason, the extractability of the fluid L can be improved.

  Further, in the bag 1 of the present embodiment, the closing film 30 is attached to the main body 2 so that one side 30A is located farther from the opening of the main body 2 than the other side 30B. It has been. Further, the folded portion 33 extends gradually away from the opening of the main body portion 2 from the other side portion 30B toward the one side portion 30A. The planned opening portion 35 is formed on one side 30 </ b> A side of the closing film 30. For this reason, compared with the case where the folding | returning part 33 is extended in a horizontal direction, when the bag 1 is inclined, the fluid L which reaches the upper edge of the bag 1 from the filling part S and flows toward the outlet 50 is The degree of direction change performed in the vicinity of the upper edge of can be made small. Thereby, since the fluid L can be guided more smoothly toward the outlet 50, the extractability of the fluid L can be further improved. Further, when the bottle to be refilled is in the upright posture, it becomes easy to insert the outlet 50 of the bag 1 into the mouth of the bottle. Furthermore, when returning the tilted bag 1 to the original posture, it is possible to prevent the fluid L from dripping.

  Also in the present embodiment, as in the case of the first embodiment, the opening 2a of the main body 2 is closed using a closing film 30 different from the films 11 and 12 constituting the main body 2. To do. For this reason, at the time of a filling process, the opening part 2a from the one side edge seal part 22a of the main-body part 2 to the other side edge seal part 22a is ensured, and the taking-out part excellent in the extractability of the fluid L 50 can be formed. That is, it is possible to secure a wide width of the opening 2a during the filling process, thereby realizing various types of bags 1 while realizing good filling suitability of the fluid. For this reason, various types can be manufactured by a simple and stable method.

  In the above-described second embodiment, the example in which the folded portion 33 of the closing film 30 is formed as a curved portion has been described. However, even if the folded portion 33 is formed as a bent portion, the upper edge of the bag 1 or the upper edge of the outlet portion 50 is configured as a seal portion because of the elastic characteristics of the closing film 30. Thus, it is considered that the inner surface 30x of the first portion 31 and the inner surface 30x of the second portion 32 are difficult to adhere to each other. Accordingly, even if the folded portion 33 is a bent portion, the take-out property of the fluid L can be improved as compared with the conventional bag.

  Further, in the above-described second embodiment, when the closing portion 3 is attached to the main body portion 2 or after the closing portion 3 is attached to the main body portion 2, the seal portion 36 for defining the outlet portion 50 is provided. The example formed in the closing part 3 was shown. However, the present invention is not limited to this, and the closing portion 3 in which the seal portion 36 is formed in advance may be attached to the main body portion 2. Hereinafter, an example of a method for preparing the closing part 3 in which the seal part 36 is formed will be described with reference to FIGS.

  First, as shown in FIG. 25A, a long closing film 30 for forming the closing portion 3 is prepared. Next, as shown in FIG. 25 (b), the closing film 30 is folded along the folded portion 33. Then, as shown in FIG.25 (c), the inner surface 30x of the 1st part 31 and the inner surface 30x of the 2nd part 32 of the film 30 for closure are heat-welded, and 4th type seal part R4 is made into a predetermined pattern. Form. At this time, the fourth type seal portion R <b> 4 is formed so that unsealed portions serving as a flow path of the outlet portion 50 are provided at equal intervals along the longitudinal direction of the closing film 30.

  Thereafter, as shown in FIG. 25 (d), the closing film 30 is cut at the portion of the fourth type seal portion R4 according to the interval between the unsealed portions. In this way, it is possible to obtain the closing part 3 in which the seal part 36 for defining the outlet part 50 is formed in advance. As shown in FIG. 25D, the seal portion 36 is formed not only on the one side portion 30A where the outlet portion 50 is formed but also on the other side portion 30B on the opposite side of the one side portion 30A. May be. Moreover, you may provide the notch 37 in the seal part 36 by the side in which the extraction part 50 is formed.

  According to this modification, the first portion 31 and the second portion 32 of the closing film 30 are partially heat welded in the closing portion 3 before being attached to the main body portion 2. For this reason, the shape of the closing part 3 at the time of attaching to the main-body part 2 can be maintained stably. Therefore, the operation | work which arrange | positions the film 30 for closure to the opening 2a of the main-body part 2, and the operation | work which attaches the closing part 3 to the main-body part 2 by heat welding can be made easy. Moreover, since the closure part 3 in which the seal part 36 was formed can be manufactured by a roll-to-roll system, productivity can be improved.

  By the way, conveying the closing film 30 by the roll-to-roll method as described above means that a tension along the longitudinal direction of the closing film 30 is applied to the closing film 30, thereby the closing film 30. Is elastically deformed. The longitudinal direction of the closing film 30 when transported by the roll-to-roll method corresponds to the direction in which the folded portion 33 formed by folding the closing film 30 extends. Accordingly, in the closing film 30 being conveyed in a roll-to-roll system, the radius of curvature r1 at the folded portion 33 is slightly reduced due to the elastic deformation of the closing film 30, and as a result, the first It is conceivable that the distance between the inner surface 30x of the first portion 31 and the inner surface 30x of the second portion 32 is slightly narrowed.

  On the other hand, in the above-described modification, as described above, the closing film 30 conveyed by the roll-to-roll method is folded back, and the first portion 31 and the second portion 32 are partially thermally welded. After forming the sealing portion 36, the closing film 30 is cut at a predetermined interval to produce the closing portion 3, and the closing portion 3 is attached to the main body portion 2. That is, instead of attaching the closing film 30 in a conveyed state to the main body 2, the closing film 30 is cut to form individual closing portions 3, and then attached to the main body 2. Accordingly, since the individual closing portions 3 are released from the tension applied when they are conveyed, the elastic deformation in the extending direction of the folded portion 33 is also reduced or eliminated. That is, it is considered that the radius of curvature r1 that has been reduced due to elastic deformation is completely or partially recovered. Therefore, in this modified example, it is possible to enjoy the advantage of improving the productivity by adopting the roll-to-roll method while ensuring a sufficiently large radius of curvature r1 in the folded portion 33.

In the case where the closing film 30 is prepared as a single sheet and the closing film 30 is thermally welded to the main body portion 2 to form the closing portion 3 including the sealing portion 36, the sealing portion 36 is formed. In addition, since it is possible to suppress the tension along the longitudinal direction of the closing film 30 from being applied to the closing film 30, the curvature radius r <b> 1 at the folded portion 33 can be sufficiently increased. In addition, the closing film 30 is prepared as a single sheet, the closing film 30 is folded back along the folded portion 33, and the first portion 31 and the second portion 32 of the closing film 30 are thermally welded to form a seal portion. Naturally, the curvature radius r1 of the folded portion 33 is sufficiently large even when the method of heat-welding the closing film 30 formed with the seal portion 36 to the main body portion 2 is adopted. can do. A specific example of the method of thermally welding the closing film 30 prepared on a single sheet to the main body 2 is as follows.
First, the closing film 30 in a state where the seal portion 36 is not formed is cut out with a size corresponding to the bag 1, thereby preparing the closing film 30 as a single sheet.
Next, the closing film 30 is folded along the folded portion 33, and the closing film 30 is held at a position (attachment position) for attaching to the main body 2.
-Then, the film 30 for closure in an attachment position is heat-welded to the surface film 11 and the back film 12 of the main-body part 2. FIG. Moreover, the 1st part 31 and the 2nd part 32 of the film 30 for closure in an attachment position are heat-welded, and the seal part 36 is formed.

  Moreover, in the above-mentioned 2nd Embodiment, the flow path of the fluid L from the filling part S to the extraction port part 50 is interrupted | blocked by heat-welding the inner surfaces 30x which the closing film 30 opposes. In order to prevent this, the example in which the separator SE is used in the manufacture of the bag 1 has been described. However, as long as the flow path of the fluid L from the filling portion S to the outlet portion 50 can be sufficiently secured, the method for preventing the opposing inner surfaces 30x of the closing film 30 from being thermally welded to each other. However, the method is not limited to the method using the separator SE. For example, as shown in FIG. 26, the closing film 30 may further include an inhibitor 59 applied on the inner surface 30x. The inhibitor is made of a material that can inhibit the occurrence of heat welding, and is made of, for example, a material having a melting point higher than that of the first thermoplastic resin layer 56. Such an inhibitor 59 is applied to at least a portion where the above-described third type seal portion R3 is formed, except for a portion where the above-described fourth type seal portion R4 is formed, in the closing film 30. Thus, when the outer surface 30y of the closing film 30 of the closing portion 3 and the inner surfaces 11x and 12x of the films 11 and 12 of the main body portion 2 are heat-welded, the inner surfaces 30x facing each other of the closing film 30 are simultaneously heat-welded. Can be prevented. As the inhibitor 59, for example, an ink (for example, DIC Corporation, Polycoat P-91, solid content of 10%) containing silicone resin and cellulose resin as main components and ethyl acetate as a solvent can be used. .

  In addition, there is also a method of using a material having a higher melting point than the second thermoplastic resin layer 58 constituting the outer surface 30y of the closing film 30 as the first thermoplastic resin layer 56 constituting the inner surface 30x of the closing film 30. Conceivable. For example, it is conceivable to use polypropylene as the first thermoplastic resin layer 56 and polyethylene as the second thermoplastic resin layer 58. In this case, the temperature at which the outer surface 30 y of the closing film 30 of the closing portion 3 and the inner surfaces 11 x and 12 x of the films 11 and 12 of the main body portion 2 are thermally welded is lower than the melting point of the first thermoplastic resin layer 56. In addition, by setting the temperature higher than the melting point of the second thermoplastic resin layer 58, the outer surface 30y of the closing film 30 of the closing portion 3 and the inner surfaces 11x, 12x of the films 11, 12 of the main body portion 2 are thermally welded. At the same time, the opposing inner surfaces 30x of the closing film 30 can be prevented from being thermally welded.

  In the second embodiment described above, the outer surface 30y of the end portion of the first portion 31 of the closing film 30 and the outer surface 30y of the end portion of the second portion 32 are respectively disposed on the inner side of the main body portion 2. 2 shows an example in which the inner surface 11x of the second surface film 11 and the inner surface 12x of the back film 12 are thermally welded. However, the present invention is not limited to this, and as shown in FIG. 27, by folding back the respective end portions of the first portion 31 and the second portion 32, the inner surface 30x of the first portion 31 of the closing film 30 and the first portion 31 The inner surfaces 30x of the two portions 32 may be thermally welded to the inner surface 11x of the surface film 11 of the main body 2 and the inner surface 12x of the back film 12, respectively, inside the main body 2. This can prevent the end portion of the first portion 31 and the end portion of the second portion 32 from coming into contact with the fluid L, which is preferable in terms of adhesiveness and hygiene.

  Various further modifications can be made to the above-described embodiment. Hereinafter, various examples of deformation will be described with reference to the drawings. 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.

(First modification)
In the second embodiment described above, the outer surface 30y of the closing film 30 is thermally welded to the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12 of the main body 2, whereby the closing portion 3 becomes the main body 2. The example attached to is shown. However, the present invention is not limited to this. As shown in FIG. 28, the inner surface 30x of the closing film 30 is thermally welded to the outer surface 11y of the surface film 11 and the outer surface 12y of the back film 12 of the main body 2, thereby closing the film. The part 3 may be attached to the main body part 2. In the following description, the seal portion obtained by thermally welding the outer surface 11y of the front film 11 or the outer surface 12y of the back film 12 and the inner surface 30x of the closing film 30 is referred to as a fifth type seal portion R5. There is. As shown in FIG. 28, the fifth type seal portion R5 extends from one side edge seal portion 22a to the other side edge seal portion 22a as in the case of the third type seal portion R3 shown in FIG. ing.

  FIG. 29 is a cross-sectional view showing a case where the bag shown in FIG. 28 is viewed along line XXIX-XXIX. As in the case of the second embodiment shown in FIG. 21, also in this modification, the folded portion 33 of the closing film 30 is an arc shape in the portion of the closing portion 3 attached to the main body portion 2. The cross-sectional shape is as follows. Although not shown, also in the portion where 50 is formed in the closed portion 3, the folded portion 33 has an arcuate cross-sectional shape as in the case of the second embodiment shown in FIG. doing. For this reason, the extractability of the fluid L can be improved.

(the film)
Next, an example of the layer configuration of the front film 11 and the back film 12 in this modification will be described. As shown in FIG. 30, the front film 11 and the back film 12 include a base material layer 52, a first thermoplastic resin layer 51 provided on one side of the base material layer 52, and the other of the base material layer 52. And a second thermoplastic resin layer 53 provided on the side. In the example shown in FIG. 30, the first thermoplastic resin layer 51 constitutes the inner surfaces 11x and 12x of the films 11 and 12, and the second thermoplastic resin layer 53 constitutes the outer surfaces 11y and 12y of the films 11 and 12, respectively. Is configured. The above-mentioned fifth type seal portion R5 is configured by thermally welding the inner surface 30x of the closing film 30 and the outer surfaces 11y and 12y of the films 11 and 12.

  As long as the inner surface 30x is formed of a thermoplastic resin layer, the layer configuration of the closing film 30 in the present modification is not particularly limited. For example, as the closing film 30, the closing film 30 having the layer configuration in the first embodiment shown in FIG. 5 described above and the closing film having the layer configuration in the second embodiment shown in FIG. 23 described above. 30 can be used.

(Production method)
Next, the manufacturing method of the bag 1 according to this modification will be described with reference to FIG.

  First, as shown in FIG. 31 (a), the main body 2 is prepared so that the opening 2a faces upward. Next, a filling step of filling the fluid L into the filling portion S of the main body 2 from the nozzle of the filling device F through the opening 2a is performed. Also in this modified example, the opening 2a extends from one of the pair of side edge seal portions 22a to the other, as in the case of the second embodiment described above. Therefore, the filling process can be easily performed.

  Next, a closing process for closing the opening 2 a of the main body 2 using the closing portion 3 made of the closing film 30 is performed. Specifically, first, as shown in FIG. 31 (b), a closing portion 3 made of a closing film 30 is prepared in which the folded portion 33 is folded back so as to be convex upward here. Next, as shown in FIG. 31 (c), the closing part 3 is put on the opening 2 a of the main body part 2.

  In this modification, when the films 11 and 12 are heated in order to thermally weld the inner surface 30x of the closing film 30 to the outer surface 11y of the front film 11 and the outer surface 12y of the back film 12, the outer surfaces of the films 11 and 12 are used. It is conceivable that not only the second thermoplastic resin layer 53 constituting 11y, 12y but also the first thermoplastic resin layer 51 constituting the inner surfaces 11x, 12x of the films 11, 12 are melted. When the first thermoplastic resin layer 51 is melted and the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12 are thermally welded, the flow path of the fluid L from the main body 2 to the outlet 50 Will be blocked or suppressed. In consideration of this point, as shown in FIG. 31 (c), a separator is formed between the front film 11 and the back film 12 and heated when the closure 3 is attached to the main body 2. SE is arranged. In this state, thermal welding of the inner surface 30x of the closing film 30 to the outer surface 11y of the surface film 11 and the outer surface 12y of the back film 12 is performed. Thus, as shown in FIG. 31 (d), the closing film 30 can be attached to the main body 2 while preventing the inner surface 11 x of the front film 11 and the inner surface 12 x of the back film 12 from being thermally welded. .

  Further, a heat welding step is further performed on the closing film 30 attached to the main body 2 to form a seal portion 36 composed of a fourth type seal portion R4 for constituting the outlet portion 50. The seal portion 36 may be formed at the same time when the fifth type seal portion R5 is formed.

  Also in the present modification, as in the case of the second embodiment described above, the outlet 50 is formed between the folded portion 33 and the seal 36 instead of between the pair of seals. . For this reason, it becomes difficult for the first portion 31 and the second portion 32 of the closing film 30 to adhere to each other. Therefore, it is possible to prevent the outlet 50 from being blocked during the extraction of the fluid L. Moreover, it can suppress that the outlet part 50 bends in the middle of taking out the fluid L. Further, the upper edge 21 of the bag 1 is constituted by the folded portion 33 of the closing film 30, and this folded portion 33 extends to the outlet 50, so that when the bag 1 is tilted, the bag 1 The fluid L that has reached the upper edge can be smoothly guided toward the outlet 50.

  In this modification, in order to prevent the inner surface 11x of the surface film 11 and the inner surface 12x of the back film 12 from being thermally welded in the flow path of the fluid L from the filling portion S to the outlet 50, the bag 1 The example in which the separator SE is used in the manufacture of the above has been described. However, the inner surface 11x of the surface film 11 and the inner surface 12x of the back film 12 are thermally welded as long as a sufficient flow path of the fluid L from the filling portion S to the outlet 50 can be secured. The prevention method is not limited to the method using the separator SE. For example, as shown in FIG. 32, the front film 11 and the back film 12 may further include an inhibitor 54 applied on the inner surfaces 11x and 12x. The inhibitor is made of a material that can inhibit the occurrence of heat welding, and is made of, for example, a material having a melting point higher than that of the first thermoplastic resin layer 51. Such an inhibitor 54 is applied to at least a portion where the above-described fifth type seal portion R5 is formed, except for a portion where the above-described fourth type seal portion R4 is formed, in the films 11 and 12. Thus, when the inner surface 30x of the closing film 30 of the closing portion 3 and the outer surfaces 11y and 12y of the films 11 and 12 of the main body portion 2 are thermally welded, the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12 are simultaneously provided. Can be prevented from being thermally welded. As the inhibitor 54, as in the case of the inhibitor 59 described above, an ink (for example, DIC Corporation, Polycoat P-91, solid content) containing silicone resin and cellulose resin as main components and ethyl acetate as a solvent. 10%) can be used.

  Moreover, as the 1st thermoplastic resin layer 51 which comprises the inner surfaces 11x and 12x of the films 11 and 12, the thing whose melting | fusing point is higher than the 2nd thermoplastic resin layer 53 which comprises the outer surfaces 11y and 12y of the films 11 and 12 is used. It is also possible to use the method For example, it is conceivable to use polypropylene as the first thermoplastic resin layer 51 and polyethylene as the second thermoplastic resin layer 53. In this case, the temperature at which the inner surface 30x of the closing film 30 of the closing portion 3 and the outer surfaces 11y and 12y of the films 11 and 12 of the main body portion 2 are thermally welded is lower than the melting point of the first thermoplastic resin layer 51. In addition, by setting the temperature higher than the melting point of the second thermoplastic resin layer 53, the inner surface 30x of the closing film 30 of the closing portion 3 and the outer surfaces 11y and 12y of the films 11 and 12 of the main body portion 2 are thermally welded. At the same time, the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12 can be prevented from being thermally welded.

(Second modification)
In the second embodiment and the first modification described above, the example in which the notch 37 is provided in the seal portion 36 that defines the flow path of the fluid L in the outlet 50 is shown. However, the specific shape of the seal portion 36 is not particularly limited as long as the flow path of the fluid L can be defined. For example, as shown in FIG. 33, a notch 37 may be provided by separating a part of the seal portion 36 including the fourth type seal portion R4. Moreover, the tear line 36c comprised so that a part of seal part 36 could be isolate | separated easily may be formed in the seal part 36. FIG. Examples of the tear line 36c include a half-cut line and a plurality of penetrating portions that are discretely provided so as to penetrate the seal portion 36. Moreover, as shown in FIG. 33, the tear line 36c may be connected to the above-mentioned opening planned part 35. For example, the tear line 36c may be configured as a series of the planned opening portion 35.

  According to this modification, the operation of opening the bag 1 can be facilitated. That is, according to this modification, the user can break the bag 1 along the tear line 36c or the planned opening portion 35 while grasping the second portion 36b, which is the separated portion of the seal portion 36. The bag 1 can be opened more easily. In FIG. 33, the seal portion 36 of the portion remaining in the bag 1 is shown as the first portion 36a. Moreover, you may provide an unsealed part in the 2nd part 36b.

  In addition, although the some modification with respect to 2nd Embodiment mentioned above has been demonstrated, naturally, it is also possible to apply combining several modifications suitably.

(Other variations)
Further, in each of the above-described embodiments and the modifications thereof, an example has been described in which the opening planned portion 35 that is to be taken out 34 is formed in the outlet 50 by being opened. However, the present invention is not limited to this, and a spout provided on the closing film 30 may constitute the outlet.

  Moreover, in each above-mentioned embodiment and its modification, the example in which the inner surface 30x of the 1st part 31 and the inner surface 30x of the 2nd part 32 were not heat-welded in the folding | returning part 33 of the film 30 for closure was shown. . However, the present invention is not limited to this, and the inner surface 30x of the first portion 31 and the inner surface 30x of the second portion 32 may be thermally welded to each other in the folded portion 33 of the closing film 30. Even in this case, the opening 2a of the main body 2 is filled by closing it with the closing portion 3 made of the closing film 30 different from the front film 11 and the back film 12 constituting the main body 2. A wide width of the opening 2a during the process can be ensured. Therefore, the filling process can be easily performed.

  Further, in each of the above-described embodiments and modifications thereof, the inner surface 30x of the closing film 30 constituting the closing portion 3 may be configured to prevent deterioration of the contents filled in the bag 1. . For example, a layer constituting the inner surface 30x of the closing film 30 may contain a degradation inhibitor such as an oxygen scavenger or a hygroscopic agent. As a result, oxygen and moisture inside the bag 1 can be removed, thereby preventing the contents from deteriorating.

  If an oxygen scavenger or a hygroscopic agent is included in the layers constituting the inner surface 11x of the surface film 11 and the inner surface 12x of the back film 12 constituting the main body 2, the contents of the main body 2 are filled with the contents. It is conceivable that the oxygen absorber and the hygroscopic agent become active before, and as a result, the performance of the oxygen absorber and the hygroscopic agent deteriorates. On the other hand, according to the present modification, the oxygen scavenger and the hygroscopic agent are contained in the inner surface of the closing portion 3 attached to the main body 2 after the fluid L is filled in the main body 2. And the performance of the hygroscopic agent can be utilized to the maximum.

  Moreover, in each above-mentioned embodiment and its modification, the example in which the main-body part 2 was comprised with the some film was demonstrated. However, as long as the opening 2a used for filling the fluid L is formed, the specific shape, structure, and manufacturing method of the main body 2 are not particularly limited. For example, the main body 2 may be configured from a single film.

  In addition, although the some modification with respect to each embodiment mentioned above has been demonstrated, naturally, it is also possible to apply combining several modifications suitably.

DESCRIPTION OF SYMBOLS 1 Bag 2 Main-body part 2a Opening 3 Closure part 11 Surface film 11x Inner surface 11y Outer surface 12 Back surface film 12x Inner surface 12y Outer surface 13 Bottom film 13c Folding part 21 Upper edge 21a Upper edge seal part 22 Side edge 22a Side edge seal part 23 Bottom edge 23a Bottom edge seal portion 25 Notch 30 Closing film 30x Inner surface 30y Outer surface 30A One side portion 30B The other side portion 31 First portion 32 Second portion 33 Turn-up portion 34 Exit 35 Opening planned portion 36 Seal portion 37 Notch 45 Chuck Tape 46 Male member 47 Female member 48 Easy peel means 49 Weak seal portion 50 Takeout portion 51 First thermoplastic resin layer 52 Base material layer 53 Second thermoplastic resin layer 56 First thermoplastic resin layer 57 Base material layer 58 Second thermoplastic resin layer 59 Inhibitor R1 Type 1 seal 2 second type sealing portion R3 third type sealing portion R4 fourth type sealing portion R5 fifth type sealing portion

Claims (8)

A method of manufacturing a bag filled with contents,
A step of preparing a main body having an opening at one end while a filling portion to be filled with contents is formed;
A filling step of filling the filling portion of the main body portion with the content through the opening;
A closing step of closing the opening of the main body portion using a closing portion made of a closing film,
The main body includes at least a front film and a back film, and the filling part is formed between the front film and the back film,
In the closing step, the closure part is thermally welded to the front film and the back film of the main body part.   The closing part includes a first part located on the side thermally welded to the front film, a second part located on the side thermally welded to the back film, and the first part and the second part. The bag manufacturing method according to claim 1, further comprising: a folded portion positioned by folding the closing film.   In the closing step, the closing portion made of the closing film folded back so that the folded portion is convex toward the inside of the main body portion is thermally welded to the main body portion. The manufacturing method of the bag as described. The closing portion constitutes a bottom portion of the bag when the bag is self-supporting,
In the closing step, the closing part is thermally welded to the front film and the back film of the main body part so that the pair of side edges of the closing part are located inside the pair of side edges of the main body part. The method for manufacturing a bag according to claim 3.   In the closing step, the closing portion made of the closing film folded so that the folded portion is convex toward the outside of the main body portion is thermally welded to the main body portion. The manufacturing method of the bag as described. The content to be filled in the filling portion includes a fluid having fluidity,
The bag manufacturing method according to claim 5, wherein an outlet portion through which the fluid that has flowed along the folded portion is taken out is formed in the closing portion.   The opening portion is formed with a scheduled opening portion that becomes an outlet when opened, and the fluid that has flowed along the folded portion is taken out from the outlet. Bag manufacturing method. The main body includes a pair of side edge seal portions extending along a pair of side edges,
The bag according to any one of claims 1 to 7, wherein the closing portion is configured to extend from one side edge seal portion of the pair of side edge seal portions to the other side edge seal portion. Manufacturing method.

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