JP2016137937A - Bag formed of receiving part having content filled therein and its manufacturing method as well as bag with receiving part having content filled therein and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag that is superior in suitability of filling contents and is compatible with various configurations.SOLUTION: In at least a surface film among the surface film and back film of a bag, an opening part penetrating through the surface film is at least partially formed in an inside position more than a seal part for defining a receiving part. Also, the bag includes a closing member attached to an inner surface of the surface film so as to be at least partially overlapped with the opening part. The closing member comprises a first surface opposed to the surface film and a second surface positioned at the opposite side of the first surface. A first layer constituting the first surface of the closing member is constituted by a material capable of being at least partially heat-welded in the inner surface of the surface film.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a bag in which an accommodating portion filled with contents is formed and a method for manufacturing the same. The present invention also relates to a bag in which a container is filled with contents and a method for manufacturing the bag.

  A bag made of a soft packaging material is used as a bag for containing a fluid having fluidity such as liquid or powder, or 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 lower 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 upper portion of the bag, or additional members may be attached to improve the handleability of the bag and the takeout of the contents. For example, in patent document 1, the through-hole for inserting a finger is provided in the upper part of a bag. Moreover, when the content is a fluid, a spout for taking out the fluid may be attached to the upper part of the bag, or an outlet for taking out the fluid may be formed at the upper part of the bag. If such an additional shape is present during the filling process, 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. Moreover, when attaching an additional member after a filling process, since it is necessary to care so that the content may not leak during an attachment process, an attachment process becomes a complicated and difficult thing. As described above, in the method of filling the contents using the upper opening and thermally sealing the opening after the filling is completed to form the upper edge seal portion, the filling process and the subsequent processes have various restrictions. Will receive.

  In order to solve such a problem, an opening is formed in the lower part of the bag, the contents are filled using this opening, and the opening is thermally welded after filling to form the lower edge seal part. It is also possible to use this method. However, if the front film and the back film are thermally welded to each other at the lower part of the bag in order to close the opening, the gusset cannot be provided at the lower part of the bag. A possible bag cannot be formed. Thus, in the method of providing an opening in the lower part, 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 bag in which an accommodation portion filled with contents is formed, and includes at least a front film and a back film, and the accommodation portion is heated along an outer edge of the front film and an outer edge of the back film. The inner surface of the seal film formed between the inner surface of the surface film and the inner surface of the back film is at least partially defined by welding, and at least the surface film of the surface film and the back film, The opening penetrating the surface film is formed at least partially at a position inside the seal portion that defines the housing portion, and the bag overlaps the opening portion at least partially. A closing member attached to the inner surface of the surface film, the closing member including a first surface facing the surface film; A second layer located on the opposite side of the first surface, and the first layer constituting the first surface of the closing member is at least partially heat welded to the inner surface of the surface film. It is a bag composed of the material to be obtained.

  According to the present invention, in the bag in which the containing portion filled with the contents is formed, the second layer constituting the second surface of the closing member is made of a material constituting the first layer of the closing member. Also, it may be made of a material having a high melting point. In addition to or in addition to this, the second surface of the closing member may be provided with an inhibitor that inhibits heat welding from occurring with the inner surface of the back film. .

  According to the present invention, in the bag in which the storage portion filled with the contents is formed, the seal portion includes a pair of side edge seal portions extending along the pair of side edges of the bag, and the bag includes at least the A chuck tape attached to the inner surface of the surface film and extending from one side edge seal portion of the pair of side edge seal portions to the other side edge seal portion may further be provided.

  According to the present invention, in the bag in which the storage portion filled with the content is formed, the content filled in the storage portion is a fluid having fluidity, and the bag pours out the fluid. A spout may be further provided.

  According to the present invention, in the bag in which the storage portion filled with the contents is formed, the seal portion includes a pair of side edge seal portions extending along the pair of side edges of the bag, and the bag is opened. By doing so, a planned opening portion serving as an outlet is formed, and the width of the planned opening portion may be smaller than the interval between the pair of side edge seal portions of the bag.

  According to the present invention, in the bag in which the storage portion filled with the contents is formed, the seal portion includes an upper edge seal portion extending along an upper edge of the bag, and the upper edge seal portion includes a through hole. May be formed.

  According to the present invention, in the bag formed with the container filled with the contents, the bag further includes a bottom film inserted between the front film and the back film so as to constitute a lower part of the bag. The lower film may be folded so that the folded portion is convex toward the housing portion.

  The present invention is a method for manufacturing a bag in which a container filled with contents is formed, the step of preparing a surface film and a back film, the step of attaching a closing member to the inner surface of the surface film, A seal part is formed at least partially between the inner surface of the front film and the inner surface of the back film by heat welding along the outer edge of the front film and the outer edge of the back film, and the accommodating part is formed inside the seal part. Among the surface film and the back film in which the opening in which the seal portion is formed is formed, at least in the surface film, an opening that penetrates the surface film is formed. And the closing member is attached to the inner surface of the surface film so as to at least partially overlap the opening. The closing member includes a first surface facing the surface film, and a second surface located on the opposite side of the first surface, and the first layer constituting the first surface of the closing member is , A bag manufacturing method, at least partially composed of a material that can be thermally welded to the inner surface of the surface film.

  The present invention is a bag filled with contents in a housing part, comprising at least a front film and a back film, wherein the housing part is at least by thermal welding along the outer edge of the front film and the outer edge of the back film Partially defined inside a seal portion formed between the inner surface of the surface film and the inner surface of the back film, and the surface film and the back film are respectively formed on the base material layer and the base material layer. A thermoplastic resin layer that constitutes the inner surface of the surface film, and of the surface film and the back film, at least the surface film includes the sealing portion that defines the accommodating portion. An opening is formed at the inner position, and at least the base material layer is divided in the opening, and the bag is opened. A closing member attached to the inner surface of the surface film so as to at least partially overlap a portion, the closing member on a first surface facing the surface film and on the opposite side of the first surface A seal portion is formed at least partially by thermal welding between the first surface of the closing member and the inner surface of the surface film. The portion is formed by the seal portion between the first surface of the closing member and the inner surface of the surface film, or between the first surface of the closing member and the inner surface of the surface film. The bag is surrounded by a combination of the seal portion and the seal portion of the inner surface of the front film and the inner surface of the back film.

  The present invention is a method of manufacturing a bag in which a container is filled with contents, the step of preparing the bag described above, and the filling step of filling the container with the contents through the opening. A closing step in which the first surface of the closing member and the inner surface of the surface film are at least partially heat welded to form a seal portion, the closing step including the opening portion, A seal portion formed by heat-welding between the first surface of the closing member and the inner surface of the surface film; or the first surface of the closing member and the inner surface of the surface film. It is surrounded by a combination of a seal portion formed by heat welding between and a seal portion formed by heat welding between the inner surface of the surface film and the inner surface of the back film. It is carried out, a method of manufacturing a bag.

  In the bag according to the present invention, at least in the surface film, an opening that penetrates the surface film is formed at least partially at a position inside the seal portion that defines the accommodating portion. For this reason, the content can be filled in the accommodation part of the bag through the opening formed in the surface film. A closing film is attached to the inner surface of the surface film so as to at least partially overlap the opening. For this reason, the opening part formed in the surface film can be closed by heat-welding the closing film to the inner surface of the surface film after filling the contents of the bag housing. Therefore, even when additional shapes and members are provided on the upper and lower portions of the bag, a wide opening width can be ensured. Accordingly, it is possible to provide a bag that is excellent in the filling ability of the contents and can cope with various types.

FIG. 1 is a perspective view showing a bag according to an embodiment of the present invention. FIG. 2A is a front view of the bag shown in FIG. 1. FIG. 2B is a cross-sectional view showing the bag shown in FIG. 2A viewed along the line IIB-IIB. 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 surface film, a back film, and a bottom film. FIG. 5 is a cross-sectional view showing an example of a layer structure of the closing film. 6A and 6B are views showing a process of attaching a closing film to the first portion of the surface film. FIG. 7 is a cross-sectional view showing a process of attaching a closing film to the first portion of the surface film. FIG. 8A is a diagram showing a process of combining the first part of the surface film to which the closing film is attached and the second part of the surface film, and FIG. 8B shows the surface film, the back film, and the bottom surface. The figure which shows the process of forming an accommodating part by heat-welding a film. FIG. 9 is a cross-sectional view showing the closing film attached to the surface film so as to overlap the opening. FIG. 10A is a diagram illustrating a filling process in which the contents are filled into the accommodating portion through the opening, and FIG. 10B is a diagram illustrating a closing process in which the opening is closed using a closing film. FIG. 11 is a cross-sectional view showing a bag having an opening in a state of being closed by a closing film. FIG. 12 is a cross-sectional view showing a modified example of a bag having an opening in a state of being closed by a closing film. FIG. 13A is a cross-sectional view showing a modified example of a bag having an opening in a state before being closed by a closing film. FIG. 13B is a cross-sectional view showing a state where the opening of the bag shown in FIG. 13A is closed with a closing film. FIG. 14A is a cross-sectional view showing a modified example of a bag having an opening in a state before being closed by a closing film. FIG. 14B is a cross-sectional view showing a state where the opening of the bag shown in FIG. 14A is closed by a closing film. FIG. 15 is a front view showing a modification of the opening formed in the surface film of the bag. FIG. 16 is a front view showing a modification of the opening formed in the surface film of the bag. FIG. 17 is a front view showing a modification of the opening formed in the surface film of the bag. FIG. 18 is a front view showing a modification of the opening formed in the surface film of the bag. FIG. 19 is a front view showing a modification of the closing film attached to the inner surface of the surface film of the bag. 20A is an enlarged view of a portion surrounded by a frame XX in FIG. FIG. 20B is a diagram showing a state where the opening of the bag shown in FIG. 20A is closed with a closing film. FIG. 21A is a front view showing a modification of the closing film attached to the inner surface of the surface film of the bag. FIG. 21B is a diagram showing a state where the opening of the bag shown in FIG. 21A is closed with a closing film. FIG. 22A is a front view showing a modification of the closing film attached to the inner surface of the surface film of the bag. FIG. 22B is a diagram showing a state where the opening of the bag shown in FIG. 22A is closed by a closing film. FIG. 23A is a front view showing a modification of the opening formed in the surface film of the bag. FIG. 23B is a diagram showing a state in which the opening of the bag shown in FIG. 23A is closed with a closing film. FIG. 24A is a front view showing a modified example of the opening formed on the surface film of the bag and the closing film. FIG. 24B is a diagram showing a state where the opening of the bag shown in FIG. 24A is closed with a closing film. FIG. 25A is a front view showing a modified example of the opening formed on the surface film of the bag and the closing film. FIG. 25B is a diagram showing an example of a state in which the opening of the bag shown in FIG. 25A is closed with a closing film. FIG. 25C is a diagram showing another example of a state in which the opening of the bag shown in FIG. 25A is closed with a closing film. FIG. 26A is a front view showing an example of a bag further provided with a chuck tape. 26B is a cross-sectional view showing the bag shown in FIG. 26A as viewed along the line XXVIB-XXVIB. Fig.27 (a) is a figure which shows the filling process which fills a storage part with the content through the opening part of the bag shown to FIG. 26A, FIG.27 (b) closes an opening part using the film for closure. The figure which shows a closing process, FIG.27 (c) is a figure which shows the method of taking out the content with which the accommodating part was filled. FIG. 28A is a front view showing a modification of the closing film attached to the inner surface of the surface film of the bag. FIG. 28B is a diagram showing a state where the opening of the bag shown in FIG. 28A is closed with a closing film. FIG. 29 is a front view showing an example of a bag further provided with a spout. FIG. 30 is a front view showing an example of a bag in which the width of the planned opening portion is narrowed. FIG. 31 is a front view showing another example of a bag in which the width of the planned opening portion is narrowed. FIG. 32 is a front view showing an example in which the bag shown in FIG. 31 further includes a chuck tape. FIG. 33 is a front view showing a bag having a through-hole formed in the upper edge seal portion. FIG. 34 is a front view showing an example of a bag in which a back seal portion is formed. FIG. 35 is a diagram illustrating an example in which the first portion of the front film and the back film are configured integrally. 36 is a front view showing a bag formed by using the front film and the back film shown in FIG. 35. FIG. FIG. 37 is a diagram illustrating an example in which a front film, a back film, and a bottom film are integrally formed.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 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 and FIG. 2A, the bag 1 of the state before being filled with the content is shown.

  In the present embodiment, an example in which the bag 1 is of a self-supporting type will be described. For example, in the lower part of the bag 1 shown in FIG. 1, a predetermined space called a gusset M is provided between a surface film 11 and a back film 12 described later. That is, the bag 1 is a so-called bottom gusset bag in which a gusset is formed on the lower edge 23 thereof. In this specification, the terms “lower part”, “upper part” and “side part”, and the terms “vertical direction” and “horizontal direction” refer to the bag 1 It represents the position and direction of the component. 2A shows a front view of the bag 1 in a state where the lower film 13 inserted between the front film 11 and the rear film 12 is folded to form the gusset M. FIG.

  The bag 1 includes at least a front film 11 and a back film 12. A seal portion is formed between the inner surface of the front film 11 and the inner surface of the back film 12 by heat welding along the outer edge of the front film 11 and the outer edge of the back film 12. Inside these seal portions, a storage portion S filled with contents is defined. In the present embodiment, the outer edge of the surface film 11 and the outer edge of the back film 12 include an upper edge 21 and a lower edge 23, and a pair of side edges 22 extending between the upper edge 21 and the lower edge 23, respectively. It is out. In addition, the seal portion that defines the storage portion S filled with the contents includes an upper edge seal portion 21a formed along the upper edge 21, a lower edge seal portion 23a formed along the lower edge 23, A pair of side edge seal portions 22 a formed along the pair of side edges 22. In addition, as long as it can prevent that the accommodating part S communicates with the exterior of the bag 1 through the outer edge of the surface film 11 and the outer edge of the back surface film 12, the width | variety and specific pattern shape of a seal | sticker part are especially limited. I can't. For example, the width of the seal portion may change depending on the position. The direction in which the seal portion extends and the direction in which the outer edge of the front film 11 and the outer edge of the back film 12 extend may be at least partially non-parallel.

  Moreover, the seal part which demarcates the accommodating part S filled with the contents may be a seal part formed by thermally welding the inner surface of the surface film 11 and the inner surface of the back film 12, or the surface The sealing part which couple | bonds the surface film 11 and the back surface film 12 by heat-welding the other film inserted between the film 11 and the back surface film 12 to the surface film 11 or the back surface film 12 may be sufficient. That is, the “seal part formed between the inner surface of the front film 11 and the inner surface of the back film 12” means only the seal part formed by heat welding the inner surface of the front film 11 and the inner surface of the back film 12. In addition, it is a concept including a seal portion formed by thermally welding the film inserted between the inner surface of the front film 11 and the inner surface of the back film 12 and the front film 11 and the back film 12.

  As long as it can pass through an opening 15 to be described later, the contents filled in the bag 1 are not particularly limited. For example, examples of the contents filled in the bag 1 include fluids such as liquid detergents and shampoos, fluids such as powders and granules, and the like. In addition, as an example of the contents filled in the bag 1, solids such as confectionery can be cited.

  Next, components of the bag 1 will be described. 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 attached to the front film 11, the back film 12, the lower film 13 inserted between the front film 11 and the back film 12, and the inner surface of the front film 11. It is constituted by a closing film 40 to be attached. Among these, the surface film 11 includes a first portion 11 a located on the upper side of the bag 1 and a second portion 11 b located on the lower side of the bag 1. In this Embodiment, the opening part 15 mentioned later is formed by comprising the surface film 11 combining the 1st part 11a and the 2nd part 11b which were mutually isolate | separated.

  The bottom film 13 is inserted between the front film 11 and the back film 12 in a state where the folded portion 13c is folded back so as to protrude toward the inner side of the bag 1 (accommodating portion S side). By forming the lower part of the bag 1 using the folded back film 13 in this way, the above-described gusset M can be formed in the lower part of the bag 1.

  In FIG. 3, reference numerals 11x, 12x, and 13x represent inner surfaces of the front film 11, the back film 12, and the bottom film 13, respectively. Reference numerals 11y, 12y, and 13y represent outer surfaces of the surface film 11, the back film 12, and the bottom film 13, respectively. In the present specification, the “inner surface” is a surface facing the storage portion S filled with the contents, and the “outer surface” is a surface located on the opposite side of the inner surface. Further, the closing film 40 includes a first surface 40x facing the surface film 11 and a second surface 40y located on the opposite side of the first surface 40x.

  Next, with reference to FIG. 2A and FIG. 2B, the structure of the bag 1 comprised by using the above-mentioned film 11, 12, 13, 40 is demonstrated in detail. FIG. 2B is a cross-sectional view showing the bag 1 shown in FIG. 2A as viewed along the line IIB-IIB.

(Aperture)
In the present embodiment, at least the surface film 11 of the surface film 11 and the back film 12 has an opening 15 penetrating the surface film 11 inside the seal portions 21 a, 22 a, and 23 a that define the accommodating portion S. At least partially. In addition, in the bag 1 in a state before the contents are filled in the storage portion S, the “opening portion 15” includes all layers such as a thermoplastic resin layer 51 and a base material layer 52, which will be described later, constituting the surface film 11. It is defined as the part that is divided. On the other hand, in the bag 1 in a state in which the seal portion is formed so as to close the opening 15 after the containing portion S is filled with the contents, the “opening 15” is the layer constituting the surface film 11. , Is defined as a portion where at least the base material layer 52 is divided.

  In FIG. 2A and FIG. 2B, the edge part of the 1st part 11a which faces the opening part 15 is represented by code | symbol 11ae, and the edge part of the 2nd part 11b which faces the opening part 15 is represented by code | symbol 11be. As long as the layers constituting the surface film 11 are separated from each other, the positional relationship between the end portion 11ae and the end portion 11be is not particularly limited. For example, as shown in FIG. 2B, the end portion 11ae and the end portion 11be may be in contact with each other. Further, as will be described later, the end portion 11ae and the end portion 11be may be separated from each other.

  As will be described later, the opening 15 is a portion through which the contents pass when the container S is filled with the contents. The dimensions of the opening 15 inside the seal portions 21a, 22a, and 23a are preferably set wider so that the contents can be efficiently filled. For example, as shown in FIG. 2A, the opening 15 may extend from one side edge seal portion 22a to the other side edge seal portion 22a. The opening 15 may extend not only to the inside of the seal portions 21a, 22a, and 23a but also to the inside of the seal portions 21a, 22a, and 23a. FIG. 2A shows an example in which the opening 15 extends from one side edge 22 of the bag 1 to the other side edge 22.

  In addition, the direction in which the opening 15 extends is not particularly limited as long as the accommodation part S can be filled with the content via the opening 15. For example, the opening 15 may extend from the upper edge seal portion 21a toward the lower edge seal portion 22a. Also in this case, by providing the closing film 40 so as to overlap the opening 15, the filling step of the contents and the closing step after the filling step can be easily performed.

  Although not shown, the opening 15 may be formed not only on the front film 11 but also on the back film 12. For example, when the accommodating part S is divided into the 1st accommodating part by the side of the surface film 11 and the 2nd accommodating part by the side of the back film 12 in the inside of the bag 1, it is the opening part 15 in the surface film 11 and the back film 12, respectively. By forming the first container and the second container, the contents can be filled through the opening 15.

  The front film 11 and the back film 12 are not particularly distinguished by printing applied to the outer surface. Therefore, the statement “at least the opening 15 is formed in the front film 11” does not limit that the opening 15 is formed in any one of the front film 11 and the back film 12. . In other words, the opening 15 described above may be formed in any of a pair of front and back films constituting the bag 1.

(Closing film)
The closing film 40 is a member provided to close the opening 15 after filling the accommodation part S with the contents using the opening 15. The closing film 40 is attached to the inner surface 11 x of the surface film 11 so as to at least partially overlap the opening 15. 2A and 2B show an example in which the closing film 40 attached to the inner surface 11x of the surface film 11 is configured to overlap the entire area of the opening 15. In FIG. 2A and FIG. 2B, reference numeral 41 denotes a mounting seal portion formed by thermally welding the closing film 40 to the inner surface 11 x of the first portion 11 a of the surface film 11. The mounting seal portion 41 is formed so as to extend from one side edge seal portion 22a to the other side edge seal portion 22a. 2A shows an example in which the closing film 40 extends from one side edge 22 of the bag 1 to the other side edge 22. FIG.

  In addition, as long as the film 40 for closure can be fixed with respect to the inner surface 11x of the surface film 11 in the bag 1 of the state before the accommodating part S is filled with the contents, the inner surface 11x of the surface film 11 is used. The method of attaching to is not limited to heat welding. Moreover, as long as the closing film 40 can at least partially overlap the opening 15 after filling the contents in the container S, in the bag 1 in a state before the contents are filled in the container S. It is not always necessary that the closing film 40 overlaps the opening 15. For example, in the bag 1 in a state before the contents are filled in the storage portion S, the closing film 40 is folded, so that the closing film 40 does not have to overlap the opening 15. In this case, when the opening 15 is closed after the accommodation portion S is filled with the contents, the closing film 40 is overlapped with the opening 15 by spreading the folded closing film 40.

(Seal part)
Next, the upper edge seal portion 21a, the side edge seal portion 22a, the lower edge seal portion 23a, and the mounting seal portion 41 will be described in detail. The upper edge seal portion 21a and the side edge seal portion 22a are seal portions formed by thermally welding the inner surface 11x of the surface film 11 and the inner surface 12x of the back film 12. On the other hand, the lower edge seal portion 23a is formed by thermally welding the inner surface 11x of the front film 11 and the inner surface 13x of the lower film 13, and by thermally welding the inner surface 12x of the back film 12 and the inner surface 13x of the lower film 13. It is the made seal part. The mounting seal portion 41 is a seal portion formed by thermally welding the inner surface 11x of the surface film 11 and the first surface 40x of the closing film 40.

  In the present specification, for convenience of explanation, seal portions obtained by heat welding the inner surface 11x of the surface film 11 and the inner surface 12x of the back film 12, such as the upper edge seal portion 21a and the side edge seal portion 22a. May be referred to as a first type seal portion R1. Further, a 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 13x of the lower film 13 such as the lower edge seal portion 23a is a second type seal portion. Sometimes referred to as R2. Further, a seal portion obtained by heat-welding the inner surface 11x of the surface film 11 and the first surface 40x of the closing film 40, such as the mounting seal portion 41, is referred to as a third type seal portion R3. There is also. Moreover, as shown in FIG. 9 to be described later, a seal portion obtained by thermally welding the inner surface 12x of the back film 12 and the second surface 40y of the closing film 40 is referred to as a fourth type seal portion R4. There is also. Moreover, different hatching may be given with respect to a different kind of seal part.

  2A, when the closing film 40 extends from one side edge 22 of the bag 1 to the other side edge 22, the pair of side edges 22 has an inner surface 11x and a back film. There will be a portion where the inner surface 12x of 12 does not directly contact. In such a portion, as shown in FIG. 2A, a third type seal portion R3 is formed by thermally welding the inner surface 11x of the surface film 11 and the first surface 40x of the closing film 40, which will be described later. As shown in FIG. 9, the fourth type seal portion R4 is formed by heat-welding the inner surface 12x of the back film 12 and the second surface 40y of the closing film 40, whereby the inner surface 11x of the surface film 11 and The space between the inner surface 12x of the back film 12 may be sealed. In this case, the side edge seal part 22a is not only the first type seal part R1 formed by thermally welding the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12, but also the third type seal part R3 or The fourth type seal portion R4 is also included.

  Further, in the same manner as in the case where the closing film 40 is inserted between the front film 11 and the rear film 12, the lower film 13 is inserted between the front film 11 and the rear film 12. In addition, the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12 do not come into direct contact. Considering this point, as shown in FIG. 2A, a notch 13 d may be formed in a portion of the lower film 13 along the side edge 22. In this case, the first type seal portion R1 can be formed by partially thermally welding the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12 through the notch 13d.

(Scheduled opening)
The front film 11 and the back film 12 of the bag 1 may be provided with easy-opening means for easily breaking the bag 1 and opening the bag 1. For example, as shown in FIG. 2A, the side edge seal portion 22 a of the bag 1 may be formed with a notch 25 serving as a starting point of breakage. Moreover, the half cut line | wire formed by laser processing, a cutter, etc. may be provided in the part used as the path | route at the time of fracture | rupture of the bag 1 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 bag 1 are matched. The bag 1 may be subjected to printing or the like for indicating the position to be opened to the user of the bag 1. In FIG. 2A, a portion (hereinafter also referred to as an opening scheduled portion) serving as an outlet for taking out the contents by breaking the bag 1 starting from the notch 25 is denoted by reference numeral 25a. Preferably, the planned opening portion 25 a is formed so as not to overlap the closing film 40.

  Although not shown in the figure, a cut or a group of scars may be formed on the front film 11 and / or the back film 12 instead of the notch 25. The scar group may include, for example, a plurality of through holes formed so as to penetrate the front film 11 and / or the back film 12. Alternatively, it may include a plurality of holes formed in the outer surfaces 11y and 12y of the front film 11 and / or the back film 12 so as not to penetrate the front film 11 and / or the back film 12. For example, the holes of the scar group may penetrate only the base material layer 52 described later of the front film 11 and / or the back film 12 and may not penetrate the thermoplastic resin layer 51.

(the film)
Next, an example of the layer configuration of the front film 11, the back film 12, the bottom film 13, and the closing film 40 will be described. First, referring to FIG. 4, the layer configuration of the front film 11, the back film 12, and the bottom film 13 will be described. As shown in FIG. 4, the front film 11, the back film 12 and the bottom film 13 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, 12 y, 13 y of the films 11, 12, 13, and the thermoplastic resin layer 51 is the inner surface of the films 11, 12, 13. 11x, 12x, and 13x are configured. 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, 12y, and 13y. The base material layer 52 has high heat resistance during heat welding.
As a material constituting the thermoplastic resin layer 51, for example, polyethylene or polypropylene can be used.
The thickness of the films 11, 12, 13 is in the range of 20 to 250 μm, for example.

  Although not shown, the films 11, 12, and 13 may further include an intermediate layer disposed between the base material layer 52 and the thermoplastic resin layer 51. As the intermediate layer, an appropriate one can be selected according to required performance such as water vapor and other gas barrier properties, light shielding properties, various mechanical strengths, and the like. For example, a metal layer, a vapor deposition layer of metal or metal oxide, or the like can be provided as the intermediate layer. In addition, a resin layer having high gas barrier properties such as an ethylene-vinyl alcohol copolymer (EVOH), a polyvinylidene chloride resin (PVDC), and an aliphatic polyamide such as nylon MXD6 may be provided as an intermediate layer. . By providing such an intermediate layer, oxygen and water vapor can be prevented from entering the bag 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 configuration of the closing film 40 will be described with reference to FIG. As shown in FIG. 5, the closing film 40 includes a first layer 56 constituting the first surface 40 x of the closing film 40 and a second layer 57 constituting the second surface 40 y of the closing film 40. Contains.

The first layer 56 is a layer that is thermally welded to the thermoplastic resin layer 51 of the surface film 11 to form the mounting seal portion 41 described above and a closing seal portion 42 described later. Therefore, the first layer 56 of the closing film 40 is at least partially made of a material that can be thermally welded to the inner surface 11 x of the surface film 11. On the other hand, when the first layer 56 of the closing film 40 is thermally welded to the thermoplastic resin layer 51 of the surface film 11 in order to close the opening 15, the second layer 57 is also melted together with the first layer 56. Then, it is conceivable that the second layer 57 of the closing film 40 is thermally welded to the inner surface 12x of the back film 12 in the region of the accommodating portion S. Considering this point, the second layer 57 constituting the second surface 40y of the closing film 40 may be made of a material having a higher melting point than the material constituting the first layer 56 of the closing film 40. Good. For example, the combinations shown in Examples 1 to 3 in Table 1 below can be adopted as a combination of the material constituting the first layer 56 and the material constituting the second layer 57.

  In addition, in order to prevent the second layer 57 of the closing film 40 from being thermally welded to the inner surface 12x of the back film 12 in the region of the accommodating portion S, the second layer 57 of the closing film 40 is not illustrated. The second surface 40y of the closing film 40 and the back film 12 are formed on a part of the surface 40y located in the housing part S and a part of the inner surface 12x of the back film 12 overlapping the closing film 40 in the housing part S. An inhibitor that inhibits thermal welding from occurring between the inner surface 12x and the inner surface 12x may be provided. As the inhibitor, 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, in FIG. 5, although the 1st surface 40x of the film 40 for closure was shown with the 1st layer 56 covering the whole region, it is not restricted to this. Of the first surface 40x of the closing film 40, the portion to be thermally welded to the inner surface 11x of the surface film 11 only needs to be constituted by at least the first layer 56, and the other portions of the first surface 40x are not shown. However, it may be configured by the second layer 57 and other layers.
5 shows an example in which the second surface 40y of the closing film 40 is configured by the second layer 57 over the entire area, the present invention is not limited to this. Of the second surface 40y of the closing film 40, the portion facing the part of the first surface 40x thermally welded to the inner surface 11x of the surface film 11 only needs to be constituted by at least the second layer 57, and the second Other portions of the surface 40y may be configured by the first layer 56 and other layers, although not shown.

  Similarly to the case of the front film 11, the back film 12, and the bottom film 13, an intermediate layer may be disposed between the first layer 56 and the second layer 57 of the closing film 40. The thickness of the closing film 40 is, for example, in the range of 20 to 250 μm. Examples of the intermediate layer include aliphatic polyamides such as ethylene-vinyl alcohol copolymer (EVOH), polyvinylidene chloride resin (PVDC), and nylon MXD6, as in the case of the surface film 11, the back film 12, and the bottom film 13. For example, a resin layer having a high gas barrier property can be used.

  In addition, it cannot be overemphasized that the layer structure of the surface film 11, the back surface film 12, the lower surface film 13, and the film 40 for closure is not limited to what was mentioned above.

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

(First step)
First, an example of the process of preparing the raw film of the laminated film for the front film 11 and the back film 12 will be described. First, the raw material of one base material layer is prepared. Here, the original fabric means a wound roll film. Next, you may print on one side of the film of the elongate base material layer unwound from one original fabric. For example, on one side of the film of the long base layer, printing of the pattern for the surface film 11 is repeatedly performed, and on the other side of the film of the long base layer, Printing of the pattern for the back film 12 may be repeated. In addition, a pattern is for showing a product display etc., and is a concept including not only images but also letters, numbers, symbols, figures, and the like. Next, using a dry lamination method or a melt extrusion lamination method, a thermoplastic resin layer is laminated on a long substrate layer film to produce a long laminated film. In this way, an original film of a laminated film for the front film 11 and the back film 12 is obtained.

(Second step)
Then, the raw material of a laminated film is prepared. In addition, in the manufacturing apparatus in which the original film of the laminated film is prepared, the original film of the lower film 13 and the original film of the closing film 40 may be prepared. Next, the laminated film is unwound from the raw film of the laminated film. Then, using a cutter blade or the like provided so as to extend along the conveyance direction of the long laminated film, the long laminated film is cut into two parts while continuously conveying the laminated film. Thereby, the elongate surface film 11 and the back film 12 can be obtained. In addition, you may make it print a pattern on a laminated | multilayer film, without giving in the state of the film of a base material layer.

(Third step)
Next, using a cutter blade or the like provided so as to extend along the conveying direction of the long surface film 11, the long surface film 11 is transferred to the two parts while continuously conveying the surface film 11. In this way, the elongated first portion 11a and second portion 11b are obtained. As the cutter blade for cutting the long surface film 11, one cutter blade may be used, or a predetermined interval is provided in a direction orthogonal to the conveying direction of the long surface film 11. You may use the two cutter blades arrange | positioned. When the surface film 11 is cut using one cutter blade, when the surface film 11 is configured by combining the first portion 11a and the second portion 11b, the first portion 11a as shown in FIG. 2B described above. The end portion 11ae and the end portion 11be of the second portion 11b come into contact with each other or come close to each other. On the other hand, when the surface film 11 is cut using two cutter blades, when the surface film 11 is configured by combining the first portion 11a and the second portion 11b, the end portion 11ae of the first portion 11a and the second portion There is a predetermined distance between the end portion 11be of the portion 11b.
In addition, the long surface film 11 is cut into two parts using a cutter blade provided so as to extend along the conveying direction of the long surface film 11, and the first part 11a and the second part 11b are cut. When obtaining, the opening part 15 will extend from one side edge seal part 22a to the other side edge seal part 22a. Moreover, when obtaining the 1st part 11a and the 2nd part 11b in this way, since the opening part 15 can be formed continuously, conveying the elongate surface film 11, it is excellent in manufacture aptitude. Yes.

  In addition, in the above-mentioned process, the example which obtains the surface film 11 and the back film 12 by printing on the film and laminated film of the base material layer unwound from one original fabric, and cut | disconnecting a laminated film after that is shown. It was. However, the present invention is not limited to this, and the front film 11 and the back film 12 may be separately prepared. For example, the original film from which the front film 11 is wound and the original film from which the rear film 12 is wound may be prepared separately. Similarly, for the first portion 11a and the second portion 11b of the surface film 11, the original fabric from which the first portion 11a is wound up and the original fabric from which the second portion 11b is wound up may be prepared separately. .

  Thereafter, the front film 11, the rear film 12 including the first part 11 a and the second part 11 b, and the lower film 13 and the closing film 40 described above are bonded to each other by thermal welding or the like. Thus, the bag 1 is produced. At this time, the step of bonding the films 11, 12, 13, 40 may be performed in a state where the films 11, 12, 13, 40 are elongated, or the films 11, 12, 13, 40 may be combined. For example, 40 may be cut in accordance with the size of the bag 1. Here, an example in which the films 11, 12, 13, and 40 are joined by heat welding in a state where the films 11, 12, 13, and 40 are long will be described below. 6A, 6B, and 8A, 8B, only the region corresponding to the size of one bag 1 out of the long films 11, 12, 13, 40 is shown. It is shown. Moreover, the above-mentioned 2nd process which divides | segments one laminated | multilayer film and obtains the surface film 11 and the back surface film 12, and the above-mentioned 3rd which divides | segments the one surface film 11 and obtains the 1st part 11a and the 2nd part 11b. Also about a process, a laminated | multilayer film may be implemented in the elongate state, or may be implemented in the state which cut | disconnected the laminated | multilayer film according to the dimension of the bag 1. FIG.

(4th process)
First, the process of attaching the closing film 40 to the inner surface 11x of the surface film 11 is performed. First, the above-described long first portion 11a and the long closing film 40 unwound from the original film of the closing film 40 are prepared. Next, as shown in FIG. 6A, the first portion 11 a and the closing film 40 are arranged so that the end portion 11 ae of the long first portion 11 a overlaps the long closing film 40. . Thereafter, the first seal surface 40x of the closing film 40 is partially thermally welded to the inner surface 11x of the first portion 11a, thereby forming the mounting seal portion 41. FIG. 7 is a diagram showing a state in which the closing film 40 and the first portion 11a are thermally welded using a pair of hot plates 61 that press the first portion 11a and the closing film 40 while heating. As shown in FIGS. 6B and 7, the mounting seal portion 41 is formed to extend along the end portion 11ae of the first portion 11a. Preferably, the temperature of the hot plate 61 is higher than the melting points of the material constituting the thermoplastic resin layer 51 of the first portion 11 a and the material constituting the first layer 56 of the closing film 40, but the closing film 40. It is controlled to be lower than the melting point of the material constituting the second layer 57. Accordingly, the second layer 57 of the closing film 40 can be prevented from being melted during the thermal welding. As a result, the second layer 57 of the closing film 40 adheres to the hot plate 61. Can be prevented.

  In addition, as long as the film 40 for closure can be attached to the inner surface 11x of the surface film 11, the width | variety and specific pattern shape of the seal part 41 for attachment are not restricted especially. For example, the mounting seal portion 41 may include a plurality of intermittently disposed seal portions. Further, the width of the mounting seal portion 41 may vary depending on the position. Further, the direction in which the mounting seal portion 41 extends and the direction in which the closing film 40 and the opening 15 extend may be at least partially non-parallel.

(5th process)
Next, the sealing portions 21a, 22a, and 23a described above are at least partially between the inner surface 11x of the surface film 11 and the inner surface 12x of the back film 12 by heat welding along the outer edge of the front film 11 and the outer edge of the back film 12. And the step of defining the accommodating portion S inside the seal portions 21a, 22a, and 23a is performed. First, as shown in FIG. 8A, a long surface film 11 is formed by combining a first portion 11a to which a long closure film 40 is attached and a long second portion 11b. Configure. At this time, a portion including the end portion 11 ae of the first portion 11 a and the end portion 11 be of the second portion 11 b becomes the opening 15. Moreover, although not shown in figure, the surface film 11 and the back surface film 12 are piled up so that the inner surface 11x of the elongate surface film 11 and the inner surface 12x of the elongate back film 12 may face each other. Further, a long bottom film 13 unwound from the original film of the bottom film 13 and bent along the folded portion 13c between the long surface film 11 and the long back film 12 is provided. insert.
Then, as shown in FIG.8 (b), by heat-welding each elongate film 11,12,13 along the part used as the upper edge 21, the side edge 22, and the lower edge 23 of the bag 1, An upper edge seal portion 21a, a lower edge seal portion 23a, and a pair of side edge seal portions 22a are formed.

(Sixth step)
Next, the long films 11, 12, 13, and 40 that are heat-welded to each other are divided along the shape of the outer edge of the bag 1, thereby accommodating the accommodating parts inside the seal parts 21 a, 22 a, and 23 a. A bag 1 in which S is defined can be obtained.

In addition, all the above-mentioned 2nd process-6th process may be implemented in-line. That is, the 2nd process-the 6th process may be continuously carried out, without winding up each film on the way. Moreover, after implementing the above-mentioned 2nd process, you may once wind up the elongate surface film 11 and the elongate back surface film 12, respectively. Moreover, after implementing the above-mentioned 3rd process, you may once wind up the elongate 1st part 11a and the elongate 2nd part 11b, respectively. Moreover, after implementing the above-mentioned 4th process, you may wind up the elongate 1st part 11a to which the elongate closing film 40 was attached once. Moreover, you may implement the above-mentioned 4th process and 5th process simultaneously.
Further, instead of dividing one laminated film as in the second step described above to obtain the front film 11 and the back film 12, the front film 11 and the back film 12 may be separately prepared. For example, the original film from which the front film 11 is wound and the original film from which the rear film 12 is wound may be prepared separately. Similarly, in the third step, the original fabric from which the first portion 11a is wound and the original fabric from which the second portion 11b is wound may be separately prepared.
Moreover, as illustrated in FIG. 35 described later, when the first portion 11a and the back film 12 of the front film 11 are configured by folding a single laminated film, the above-described second process is a dividing process. Instead, the method may include a step of forming the first portion 11a of the front film 11 and the back film 12 by folding a single laminated film.
In addition, after dividing one laminated film into two laminated films at a portion corresponding to the opening 15, by further dividing one of the two laminated films, the long first portion 11a, long The long second portion 11b and the long back film 12 may be obtained. That is, the above-described third step may be performed first, and then the second step may be performed.
As illustrated in FIG. 15 to be described later, when the opening 15 is formed so as not to overlap the pair of side edge seal portions 22a, the above-described third step is instead of the step of dividing the laminated film, A step of intermittently slitting the laminated film to form the opening 15 intermittently along the longitudinal direction of the long laminated film may be included. “Intermittently” means that two adjacent openings 15 are not connected to each other. The step of intermittently slitting the laminated film to form the openings 15 is preferably after the step of forming the front film 11 and the back film 12 by dividing or folding the laminated film. To be implemented. This is because, when the surface film 11 and the back film 12 are formed by dividing or folding the laminated film after the slit processing, the opening 15 formed by the slit processing is used as a starting point when dividing or folding. This is because it is conceivable that the laminated film is torn or the accuracy of the folded position of the laminated film is lowered.

  FIG. 9 is a cross-sectional view showing the bag 1 shown in FIG. 8B when viewed along the line IX-IX, and the closing film 40 is interposed between the front film 11 and the back film 12. It is sectional drawing which shows an example of the side edge seal part 22a formed in the part which exists. As described above, when the closing film 40 extends from one side edge 22 of the bag 1 to the other side edge 22, as shown in FIG. 9, the inner surface 11 x of the front film 11 and the inner surface 12 x of the back film 12. There is a part that does not directly contact. Even in this case, as shown in FIG. 9, the third type seal portion R3 is formed by thermally welding the inner surface 11x of the surface film 11 and the first surface 40x of the closing film 40, and the rear film The fourth type seal portion R4 is formed by thermally welding the inner surface 12x of the twelve and the second surface 40y of the closing film 40, and thereby, between the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12. Can be sealed. In order to form the fourth type seal portion R4, it is necessary to perform the thermal welding at a temperature higher than the melting point of the material constituting the second surface 40y of the closing film 40. Or it is good also considering the material of the part corresponding to the side edge seal | sticker part 22a among the 2nd surfaces 40y of the film 40 for closure as the material same as the material which comprises the 1st surface 40x.

(Content filling method)
Next, a method for manufacturing the bag 1 in which the bag 1 is filled with the contents and the container S is filled with the contents will be described.

  First, a filling process for filling the storage portion S with contents through the opening 15 will be described. First, as shown in FIG. 10A, a bag 1 is prepared which is held so that the lower edge 23 is positioned below. At this time, although not shown, the bag 1 may be held by using a grip for holding the side edge seal portion 22a. Next, contents such as a fluid are filled into the accommodating portion S of the bag 1 from the nozzle of the filling device F through the opening 15. Here, as described above, the opening 15 extends from one side edge seal portion 22a to the other side edge seal portion 22a. For this reason, the width | variety of the opening in the case of filling can be ensured widely.

  Next, the first step 40x of the closing film 40 and the inner surface 11x of the surface film 11 are at least partially thermally welded to form a seal portion, thereby closing the opening 15 is performed. In FIG. 10B and FIG. 11, the closing seal portion formed as the third-type seal portion R3 by thermally welding the first surface 40x of the closing film 40 and the inner surface 11x of the surface film 11 is denoted by 42. FIG. 11 is a cross-sectional view showing the bag in a state where the closing portion 15 is closed by the closing film 40, and a cross-sectional view showing a case where the bag 1 shown in FIG. 10B is viewed along the line XI-XI. It is.

  In the example shown in FIG. 10B and FIG. 11, the closing seal portion 42 overlaps with the opening 15 and is formed so as to extend from one side edge seal portion 22a to the other side edge seal portion 22a. By forming such a sealing part 42 for closing, the opening part 15 of the bag 1 filled with the contents can be closed and the bag 1 can be sealed.

  Preferably, in the closing step, the temperature of the thermal welding is higher than the melting point of the material constituting the thermoplastic resin layer 51 of the first portion 11a and the material constituting the first layer 56 of the closing film 40, but for closing. It is controlled so as to be lower than the melting point of the material constituting the second layer 57 of the film 40. Thereby, it is possible to prevent the second layer 57 of the closing film 40 from being melted at the time of heat welding, and thereby, the second surface 40y of the closing film 40 and the outer surface 12y of the back film 12 Can be prevented from being thermally welded.

  By the way, in the closing step, when the surface film 11 and the closing film 40 are thermally welded, the ends of the thermoplastic resin layer 51 and the second portion 11b that are exposed at the end portion 11ae of the first portion 11a of the surface film 11 are used. The thermoplastic resin layer 51 exposed to the part 11be is also thermally welded at the same time, and the end part 11ae and the end part 11be may be partially coupled. On the other hand, as long as the temperature of heat welding is lower than the melting point of the material constituting the base material layer 52 of the surface film 11, the base material layer 52 exposed at the end portion 11ae and the base exposed at the end portion 11be. The material layer 52 does not melt. Therefore, in the bag 1 in the state after the contents are filled in the storage portion S, the “opening portion 15” includes at least the base material layer 52 among the layers constituting the surface film 11 as described above. Can be defined as a part.

  In addition, in FIG. 11, the example in which the sealing part 42 for closure is formed so that it may overlap with the opening part 15 was shown. However, as long as the closing process is performed so that the opening 15 is surrounded by the mounting seal portion 41 and the closing seal portion 42 between the first surface 40x of the closing film 40 and the inner surface 11x of the surface film 11. The specific shape and arrangement of the closing seal portion 42 are not particularly limited. For example, as shown in FIG. 12, a pair of closing sealing portions 42 may be formed so as to face each other with the opening 15 interposed therebetween. In addition, when the space between the surface film 11 and the closing film 40 on the first portion 11a side is sealed in advance by the mounting seal portion 41 formed before the closing step, the closing seal portion 42 may be formed only between the second portion 11 b of the surface film 11 and the closing film 40. That is, as long as it is possible to prevent the accommodating portion S and the space outside the bag 1 from communicating with each other through the opening 15, various forms can be considered as the shape and arrangement of the closing seal portion 42.

  As described above, in the bag 1 according to the present embodiment, at least the surface film 11 has the opening 15 penetrating the surface film 11 at a position inside the seal portions 21a, 22a, and 23a that define the housing portion S. At least partially formed. For this reason, the contents can be filled into the accommodating portion S of the bag 1 through the opening 15 formed in the surface film 11. A closing film 40 is attached to the inner surface 11x of the surface film 11 so as to at least partially overlap the opening 15. For this reason, after filling the accommodating part S of the bag 1 with the contents, the opening 15 formed in the surface film 11 can be closed by thermally welding the closing film 40 to the inner surface 11x of the surface film 11. it can. Therefore, even when additional shapes and members are provided on the upper and lower portions of the bag 1, a wide opening width can be ensured. Thereby, the bag 1 which is excellent in the filling ability of the contents and can cope with various types can be provided.

  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.

(Modification of opening)
Hereinafter, some modified examples of the opening 15 will be described with reference to FIGS. 13A to 18.

  In the above-described embodiment, an example in which the end portion 11ae of the first portion 11a and the end portion 11be of the second portion 11b of the surface film 11 are in contact with each other or very close to each other in the opening portion 15 is shown. It was. However, the present invention is not limited to this, and as shown in FIGS. 13A and 13B, in the opening portion 15, between the end portion 11 ae of the first portion 11 a and the end portion 11 be of the second portion 11 b of the surface film 11. There may be a predetermined interval. 13A is a cross-sectional view showing the bag 1 with the opening 15 in a state before being closed by the closing film 40, and FIG. 13B shows the opening 15 of the bag 1 shown in FIG. 13A. It is sectional drawing which shows the state closed by 40. FIG. The distance between the end portion 11ae of the first portion 11a and the end portion 11be of the second portion 11b is not particularly limited, but is preferably set within a range of 0 to 10 mm, and more preferably within a range of 1 to 7 mm. Set in.

  In addition, as shown in FIG. 14A and FIG. 14B, in the opening part 15, the edge part 11ae of the 1st part 11a of the surface film 11 overlaps with the 2nd part 11b, and the edge part 11be of the 2nd part 11b is 1st. It may overlap the portion 11a. 14A is a cross-sectional view showing the bag 1 with the opening 15 in a state before being closed by the closing film 40, and FIG. 14B shows the opening 15 of the bag 1 shown in FIG. 14A. It is sectional drawing which shows the state closed by 40. FIG. The width of the portion where the first portion 11a and the second portion 11b overlap is not particularly limited, but the end portion 11ae and the second portion of the first portion 11a in a state where the opening 15 is closed by the closing film 40. The width of the end portion 11be of 11b can be set within a range of 2 to 6 mm, for example.

  In the bag 1 shown in FIG. 14A, the contents are filled into the accommodating portion S of the bag 1 through the opening 15 in a state where the second portion 11 b is separated from the first portion 11 a so that the opening 15 is widened. . Preferably, as shown to FIG. 14A, the part which has a large area among the 1st part 11a and the 2nd part 11b, here the 2nd part 11b is located in the outer surface side of the bag 1 rather than the 1st part 11a. The first portion 11a and the second portion 11b are overlapped. After that, as shown in FIG. 14B, the second portion 11 b is pressed toward the closing film 40 so that the portion of the second portion 11 b of the surface film 11 that does not overlap the first portion 11 a contacts the closing film 40. By heating while heating, the inner surface 11x of the second portion 11b and the first surface 40x of the closing film 40 are thermally welded. Thereby, the sealing part 42 for closure for closing the opening part 15 can be formed.

  In the above-described embodiment, the example in which the opening 15 extends from the one side edge seal portion 22a to the other side edge seal portion 22a has been described. However, the present invention is not limited to this, and as shown in FIG. 15, the opening 15 has one side edge seal portion 22 a and the other side edge seal portion so as not to overlap the pair of side edge seal portions 22 a. It may be formed in the surface film 11 between 22a. Even in this case, the contents can be filled into the accommodating portion S of the bag 1 through the opening 15. Moreover, after filling the accommodating part S of the bag 1 with the contents, the opening 15 formed in the surface film 11 can be closed by thermally welding the closing film 40 to the inner surface 11x of the surface film 11. . According to this modification, the sealing performance of the bag 1 after closing the opening 15 using the closing film 40 can be improved by not allowing the opening 15 to reach the side edge seal portion 22a.

  Further, in the above-described embodiment, the example in which the opening 15 extends linearly between the one side edge seal portion 22a and the other side edge seal portion 22a is shown. However, the present invention is not limited to this, and the opening 15 may include a curved portion. In FIG. 16, an example in which the opening 15 includes a curved portion so as to protrude from the lower portion of the bag 1 toward the upper portion is shown. By curving the opening 15 in this manner, the opening 15 can be easily widened during the filling step, thereby further enhancing the suitability for filling the contents. As shown in FIG. 17, the opening 15 has a curved portion that protrudes from the lower portion of the bag 1 toward the upper portion and a curved portion that protrudes from the upper portion of the bag 1 toward the lower portion. And may be present repeatedly.

  In the above-described embodiment, the example in which the opening 15 continuously extends between the one side edge seal portion 22a and the other side edge seal portion 22a has been described. However, the present invention is not limited to this, and a plurality of intermittently extending openings 15 are formed in the surface film 11 as shown in FIG. 18 as long as sufficient filling ability can be ensured in the filling step. May be. In this case, a connecting portion 15 a exists between two adjacent openings 15. The connecting portion 15a is defined as a portion where the layers constituting the surface film 11 located between the two openings 15 are not divided.

  The width of the connecting portion 15a is set so that the connecting portion 15a can be easily broken by pulling the first portion 11a or the second portion 11b to the outer surface 11y side of the surface film 11 or the like. For this reason, at the time of a filling process, the connection part 15a is fractured | ruptured and each opening part 15 is connected, and the width | variety of the opening at the time of filling can be ensured widely. Further, due to the presence of the connecting portion 15a, the first portion 11a and the second portion 11b are deformed due to a frictional force or the like generated at the time of manufacturing or transporting the bag 1 before being filled with the contents, thereby opening the bag. It can be suppressed that the shape of the portion 15 is distorted. That is, it is possible to improve manufacturing suitability and transport suitability of the bag 1 before the contents are filled.

  In the example shown in FIGS. 15 to 18 described above, the bag 1 is shown in a state before the contents are filled in the storage portion S.

(Modification of film for closure)
Hereinafter, some modified examples of the closing film 40 will be described with reference to FIGS. 19 to 22B.

  In the above-described embodiment, an example in which the closing film 40 extends from one side edge 22 of the bag 1 to the other side edge 22 has been described. However, the present invention is not limited to this, and as shown in FIG. 19, the closing film 40 is configured to reach the pair of side edge seal portions 22 a but not to the pair of side edges 22. May be. In addition, in FIG. 19, the bag 1 of the state before the accommodating part S is filled with the content is shown. FIG. 20A is an enlarged view of a portion surrounded by a frame XX in FIG. FIG. 20B is a diagram showing a state in which the opening 15 of the bag 1 shown in FIG. 20A is closed by the closing film 40.

  When the closing film 40 is configured not to reach the pair of side edges 22, as shown in FIG. 20A, the side edges 22 of the side edge seal portions 22 a extending along the side edges 22 of the bag 1 are formed. The first type seal portion R1 can be formed in a portion overlapping the closing film 40 in the orthogonal direction. For this reason, the side edge seal portion 22a can include a first type seal portion R1 that continues from the upper edge seal portion 21a to the lower edge seal portion 23a, and thereby the bag 1 can be sealed more firmly. it can. 20A shows an example in which the side seal portion 22a includes a third-type seal portion R3 formed by thermally welding the inner surface 11x of the surface film 11 and the first surface 40x of the closing film 40. However, it is not limited to this. In the present modification, although not illustrated, the third type seal portion R3 may not be included in the side edge seal portion 22a.

  In addition, as shown in FIGS. 21A and 21B, the closing film 40 may be configured not to reach the side edge seal portion 22a. FIG. 21A is a cross-sectional view showing the bag 1 having the opening 15 in a state before being closed by the closing film 40, and FIG. 21B shows the opening 15 of the bag 1 shown in FIG. It is sectional drawing which shows the state closed by 40. FIG.

  In addition, as shown to FIG. 21A, when the part which the film 40 for closure and the opening part 15 have not overlapped in the position inside seal | sticker part 21a, 22a, 23a which demarcated the accommodating part S exists, an opening part The opening 15 cannot be completely closed only by the mounting seal part 41 and the closing seal part 42 formed by heat welding between the film 15 and the closing film 40. In this case, as shown in FIG. 21B, the inner surface 11x of the surface film 11 and the inner surface 12x of the back film 12 are thermally welded so as to sandwich or cover a portion of the opening 15 that does not overlap with the closing film 40. By forming the type 1 seal portion R1, the opening 15 can be completely closed. In the example shown in FIG. 21B, it can be said that the closing seal portion 42 includes the first type seal portion R1 in addition to the third type seal portion R3. Thus, the closing process of closing the opening 15 includes the third type seal portion R3 between the first surface 40x of the closing film 40 and the inner surface 11x of the surface film 11, and the inner surface 11x and the back surface of the surface film 11. The opening 15 may be surrounded by the combination of the first type seal portion R1 with the inner surface 12x of the film 12.

  Further, as shown in FIGS. 22A and 22B, a plurality of through holes 43 may be formed in the closing film 40. 22A is a cross-sectional view showing the bag 1 having the opening 15 in a state before being closed by the closing film 40, and FIG. 22B shows the opening 15 of the bag 1 shown in FIG. 22A. It is sectional drawing which shows the state closed by 40. FIG.

  In the example shown in FIG. 22A and FIG. 22B, in the part which overlaps with the through-hole 43 of the closing film 40 among the side edge seal parts 22a, the inner surface 11x of the surface film 11 and the inner surface 12x of the back film 12 via the through-hole 43. Can be partially heat-welded to form the first type seal portion R1. Thereby, the bag 1 can be sealed more firmly. In addition, the through-hole 43 may be formed not only in the part which overlaps the side edge seal part 22a among the films 40 for closure but in the position inside the seal parts 21a, 22a, and 23a. Further, one through hole 43 may be formed.

(Variation regarding combination of closing film and opening)
Hereinafter, with reference to FIG. 23A-FIG. 25C, some modifications regarding the combination of the film 40 for closure and the opening part 15 are demonstrated. In each modification shown in FIGS. 23A to 25C, the opening 15 does not reach the side edge seal portion 22 a and has a predetermined opening width t in the direction along the side edge 22. Such an opening 15 can be formed, for example, by partially cutting out the surface film 11 using a predetermined mold.

  In the example shown in FIGS. 23A and 23B, the closing film 40 is configured to extend from one side edge 22 of the bag 1 to the other side edge 22. FIG. 23A is a cross-sectional view showing the bag 1 having the opening 15 in a state before being closed by the closing film 40, and FIG. 23B shows the opening 15 of the bag 1 shown in FIG. It is sectional drawing which shows the state closed by 40. FIG. In this modification, by forming the closing seal portion 42 so that the opening 15 is sandwiched between the mounting seal portion 41 and the closing seal portion 42, as shown in FIG. After filling S with the contents, the opening 15 can be closed using the closing film 40. Note that both the mounting seal portion 41 and the closing seal portion 42 are formed so as to extend from one side edge seal portion 22a to the other side edge seal portion 22a.

  In the example shown in FIGS. 24A and 24B, the closing film 40 is configured to reach the pair of side edge seal portions 22 a but not to the pair of side edges 22. 24A is a cross-sectional view showing the bag 1 having the opening 15 in a state before being closed by the closing film 40, and FIG. 24B shows the opening 15 of the bag 1 shown in FIG. 24A. It is sectional drawing which shows the state closed by 40. FIG. Also in this modified example, the closing seal portion 42 is formed so that the opening 15 is sandwiched between the mounting seal portion 41 and the closing seal portion 42 as in the case shown in FIGS. 23A and 23B described above. (See FIG. 24B), the opening 15 can be closed using the closing film 40 after the container S of the bag 1 is filled with the contents.

  In the example shown in FIGS. 25A and 25B, the closing film 40 is configured not to reach the side edge seal portion 22a. 25A is a cross-sectional view showing the bag 1 having the opening 15 in a state before being closed by the closing film 40, and FIG. 25B shows the opening 15 of the bag 1 shown in FIG. It is sectional drawing which shows an example of the state closed by 40. FIG. FIG. 25C is a cross-sectional view showing another example of the state in which the opening 15 of the bag 1 shown in FIG. 25A is closed by the closing film 40.

  In the example shown in FIG. 25B, the closing seal portion 42 includes a third type seal portion R3 extending along the opening portion 15 so as to sandwich the opening portion 15 with the mounting seal portion 41, and the opening portion 15 A third-type seal portion R3 extending along the side edge 22 between the side edge seal portion 22a is included. As a result, as shown in FIG. 25B, the opening 15 is surrounded by the third-type seal portion R3, and the opening 15 can be closed.

  On the other hand, in the example shown in FIG. 25C, the closing seal portion 42 includes a third type seal portion R3 extending along the opening portion 15 so as to sandwich the opening portion 15 with the mounting seal portion 41, and the opening portion. 1st seal part R1 extended along the side edge 22 between 15 and the side edge seal part 22a is included. As a result, as shown in FIG. 25C, the opening 15 is surrounded by the combination of the third type seal portion R3 and the first type seal portion R1, and the opening 15 can be closed.

(Example where chuck tape is provided)
As shown in FIG. 26A, the bag 1 is attached to at least the inner surface 11x of the surface film 11 and extends from one side edge seal portion 22a of the pair of side edge seal portions 22a to the other side edge seal portion 22a. May be further provided. 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. 26A shows a bag with the opening 15 in a state before being closed by the closing film 40.

  FIG. 26B is a cross-sectional view showing the bag 1 shown in FIG. 26A when viewed along the line XXVIB-XXVIB. As shown in FIG. 26B, the chuck tape 45 includes a female member 47 provided on the inner surface 11 x side of the surface film 11 and a male member attached to the inner surface 12 x of the back film 12 so as to face the female member 47. 46. FIG. 26B shows an example in which the female member 47 is provided on the closing film 40 attached to the inner surface 11x of the surface film 11. For example, the female member 47 may be configured integrally with the first layer 56 and the second layer 57 of the closing film 40. Although not shown, the female member 47 may be attached to the inner surface 11x of the surface film 11 without the closing film 40 interposed therebetween.

  The male member 46 and the female member 47 are configured to be fitted to each other. In this case, the accommodating part S of the bag 1 after opening can be sealed again by fitting the male member 46 and the female member 47 together. Further, by removing the fitting between the male member 46 and the female member 47, the contents in the accommodating portion S can be taken out. Although not shown, the male member 46 may be attached to the front film 11 side, and the female member 47 may be attached to the back film 12 side.

  As shown in FIG. 26B, the inner surface 11x of the front film 11 and the inner surface 12x of the back film 12 can be joined to the portion below the chuck tape 45 inside the bag 1 as required. Peel means 48 may be provided. By bonding the front film 11 and the back film 12 on the lower side of the chuck tape 45, it is possible to suppress the contents from contacting 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 contents between the male member 46 and the female member 47, for example. Further, by providing the easy peel means 48, it is possible to more reliably suppress the contents 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 content 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. 26B, the easy peel means 48 includes an easy peel film 49 attached to the inner surface 12x of the back film 12 so as to face the closing film 40 attached to the inner surface 11x of the front film 11. May be. The easy peel film 49 may be attached to the second surface 40y of the closing film 40 instead of the inner surface 12x of the back film 12.

  A method of filling the bag 1 shown in FIG. 26A with the contents will be described with reference to FIGS. 27 (a) and 27 (b). First, as shown in FIG. 27A, in the state where the easy peel film 49 attached to the inner surface 12x of the back film 12 is bonded to the closing film 40, the second portion 11b is formed so that the opening 15 is widened. Pull away from part 11a. And the filling process which fills the accommodating part S of the bag 1 with the content through the opening part 15 is implemented. Next, as shown in FIG. 27 (b), a closing process is performed in which the first surface 40x of the closing film 40 and the inner surface 11x of the surface film 11 are at least partially heat welded to form a closing seal portion 42. To do. Thereby, the bag 1 in which the storage portion S is filled with the contents and the opening 15 is closed can be obtained.

  FIG. 27C is a view showing a state in which the male member 46 and the female member 47 are disengaged in order to take out the contents in the accommodating portion S. In the example shown in FIG. 27C, the easy peel film 49 has an adhesion force between the easy peel film 49 and the inner surface 12x of the back film 12 such that the easy peel film 49 and the second surface 40y of the closing film 40 It is comprised so that it may become smaller than the adhesive force between. In this case, when the interval between the front film 11 and the back film 12 is increased so that the male member 46 and the female member 47 are disengaged, as shown in FIG. 49 is peeled from the outer surface 12 y of the back film 12.

  By the way, when it arrange | positions between the surface film 11 and the back surface film 12 so that the chuck | zipper tape 45 and the closing film 40 may overlap, formation of the side edge seal | sticker part 22a is inhibited by the zipper tape 45, Therefore It is conceivable that the sealing performance of the lowers. In particular, it is considered that the formation of the side edge seal portion 22a is likely to be hindered at the positions where the end portions of the male member 46 and the female member 47 of the chuck tape 45 exist. Considering this point, as shown in FIGS. 28A and 28B, the through-hole 43 described above may also be formed in the closing film 40 of the bag 1 including the chuck tape 45. 28A is a cross-sectional view showing the bag 1 having the opening 15 in a state before being closed by the closing film 40, and FIG. 28B shows the opening 15 of the bag 1 shown in FIG. 28A. It is sectional drawing which shows the state closed by 40. FIG.

  According to the example shown in FIGS. 28A and 28B, the inner surface 11x of the surface film 11 and the inner surface of the back film 12 through the through hole 43 in a portion of the side edge seal portion 22a that overlaps the through hole 43 of the closing film 40. The first type seal portion R1 can be formed by partially thermally welding 12x. Thereby, the bag 1 can be sealed more firmly. The through hole 43 is preferably disposed so as to overlap the end portions of the male member 46 and the female member 47 of the chuck tape 45 or in the vicinity of the end portions of the male member 46 and the female member 47.

(Modification of the outlet)
In the above-described embodiment, the example in which the outlet for taking out the contents from the storage portion S of the bag 1 is formed by breaking the bag 1 is shown. However, the present invention is not limited to this, and as shown in FIG. 29, the bag 1 is attached to, for example, the upper portion or the upper edge seal portion 21a of the bag 1, and includes a spout 26 for pouring out the contents. Also good. In this case, a fluid having fluidity is employed as the contents filled in the storage portion S of the bag 1.

(Modification of the planned opening part)
In the above-described embodiment, an example has been shown in which the unscheduled opening portion 25a that becomes the take-out opening when opened has the same width as the interval between the pair of side edge seal portions 22a of the bag 1. However, the present invention is not limited to this. For example, as shown in FIG. 30, an outlet 50 for taking out the contents may be formed on the top of the bag 1. The take-out port 50 is a portion that is provided to adjust the flow of the contents when the contents such as the fluid are taken out from the bag 1. The opening portion 50 is formed with a planned opening portion 25a that is an opening for taking out the fluid when opened, and the width w of the opening portion 25a is a pair of side edge seal portions 22a of the bag 1. The interval between is smaller.

  As long as the width w of the planned opening portion 25a of the outlet 50 is smaller than the distance between the pair of side edge seal portions 22a, the specific shape of the outlet 50 is not particularly limited. . For example, as shown in FIG. 31, the outlet 50 may be configured as a portion having a width that is substantially half the distance between the pair of side edges 22. In this case, in the manufacturing process of the bag 1, the bag 1 can be manufactured by efficiently allocating the two bags 1 formed with the outlet 50 shown in FIG. 31.

  As shown in FIG. 32, the bag 1 in which the outlet portion 50 is formed may further include the above-described chuck tape 45.

(Modification of upper edge seal part)
As shown in FIG. 33, the upper edge seal portion 21a of the bag 1 may be formed with a through hole 21b for inserting a finger.

(Variation of bag shape)
As shown in FIG. 34, the bag 1 includes an upper edge seal portion 21a and a lower edge seal portion 23a, and a back seal portion extending from a substantially central portion of the upper edge seal portion 21a toward a substantially central portion of the lower edge seal portion 23a. 24, so-called pillow bags. In this case, the back seal portion 24 is provided on the surface opposite to the surface on which the opening 15 is formed. For example, when the opening 15 is formed in the front film 11, the back seal part 24 is provided on the back film 12 side.

  Even if it is a case where it is difficult to form an opening in the upper portion of the bag 1 and fill the contents as shown in FIGS. 29 to 34, the opening that penetrates the surface film 11 is used. By forming 15, the contents can be easily filled into the accommodating portion S of the bag 1. In the example shown in FIGS. 29 to 34 described above, the bag 1 in a state before the container S is filled with the contents is shown.

(Modifications of members constituting the bag)
In the above-described embodiment, an example in which the surface film 11, the back film 12, the bottom film 13, and the closing film 40 are separate films has been described. However, it is not restricted to this, Each film 11, 12, 13, 40 may be partially comprised integrally. For example, as shown in FIG. 35, the 1st part 11a and the back film 12 of the surface film 11 may be comprised by folding back one film.

  FIG. 36 is a front view showing the bag 1 formed by using the films 11, 12, 13, and 40 shown in FIG. As shown in FIG. 36, in this modification, the upper portion of the bag 1 can be sealed without forming the above-described upper edge seal portion 21 a along the upper edge 21.

  In addition, at least a part of the surface film 11, at least a part of the back film 12, and the bottom film 13 may be configured by folding a single laminated film. In this case, a folded portion exists between the front film 11 and the lower film 13 and between the rear film 12 and the lower film 13. FIG. 37 shows an example in which the first part 11a of the front film 11, the back film 12, the lower film 13, and the second part 11b of the front film 11 are formed in order by folding a single film.

  As shown in FIG. 35 and FIG. 37, when the front film 11, the back film 12, the lower film 13, and the like are formed by folding a single laminated film, the use of the laminated film necessary for producing the bag 1 is used. The amount can be reduced.

(Other variations)
In the above-described embodiment, an example in which the closing film 40 is used as a closing member for closing the opening 15 has been described. However, the present invention is not limited to this, and a plastic molded body may be used as a closing member for closing the opening 15. The plastic molded body is obtained by molding and solidifying a synthetic resin. The method for forming the plastic molded body is not particularly limited, and a known method such as a sheet molding method, an injection molding method, an extrusion molding method, or a blow molding method is appropriately used.
In the sheet molding method, first, a mold having a surface shape corresponding to the shape of the closing member is prepared. Next, a synthetic resin sheet that has been heated and softened is set in a mold. Thereafter, the sheet is brought into close contact with the mold using a vacuum force or a compressed air force, thereby imparting the shape of the mold to the sheet. In this way, a plastic molded body for constituting the closing member can be obtained.
In the injection molding method, first, a mold having a surface shape corresponding to the shape of the closing member is prepared. Next, the mold is filled with a synthetic resin heated to a temperature at which it has fluidity. When the synthetic resin in contact with the mold is solidified, a plastic molded body along the surface shape of the mold can be obtained.
In the extrusion molding method, first, a die called a die provided with holes corresponding to the cross-sectional shape of the closing member is prepared. Next, the synthetic resin is molded by extruding the synthetic resin heated to a temperature at which it has fluidity through a hole in the mold. Then, the plastic molding which has the same cross-sectional shape can be continuously obtained by cooling a synthetic resin. In the extrusion molding method, since the synthetic resin extruded from the mold is softened by heat, it can be considered that the synthetic resin is deformed before the synthetic resin is cooled and solidified. In order to suppress the occurrence of such deformation, the synthetic resin is preliminarily cooled while maintaining the shape of the synthetic resin between the mold and a cooling device for performing final cooling, for example, a water tank. A precooling step may be performed. For example, a so-called sizing die can be used to preliminarily cool the synthetic resin while suppressing the deformation of the synthetic resin. The sizing die is provided, for example, on the side surface of the water tank for performing final cooling.

  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 11 Surface film 11a 1st part 11b 2nd part 12 Back surface film 13 Bottom film 15 Opening part 15a Connection part 21 Upper edge 21a Upper edge seal part 21b Through-hole 22 Side edge 22a Side edge seal part 23 Lower edge 23a Lower edge Seal part 24 Back seal part 25 Notch 25a Opening scheduled part 26 Spout 40 Closing film 41 Mounting seal part 42 Closing seal part 43 Through hole 45 Chuck tape 46 Male member 47 Female member 48 Easy peel means 49 Easy peel film 50 outlet portion 51 thermoplastic resin layer 52 base material layer 53 second thermoplastic resin layer 56 first layer 57 second layer

Claims (11)

A bag formed with a container filled with contents,
At least a front film and a back film,
The accommodating portion is defined inside a seal portion formed at least partially between the inner surface of the front film and the inner surface of the back film by heat welding along the outer edge of the front film and the outer edge of the back film. Made
Among the surface film and the back film, at least the surface film has an opening penetrating the surface film formed at least partially at a position inside the seal portion defining the housing portion. And
The bag further comprises a closing member attached to the inner surface of the surface film so as to at least partially overlap the opening.
The closing member includes a first surface facing the surface film, and a second surface located on the opposite side of the first surface,
The bag, wherein the first layer constituting the first surface of the closing member is at least partially made of a material that can be thermally welded to the inner surface of the surface film. The second layer constituting the second surface of the closing member is made of a material having a higher melting point than the material constituting the first layer of the closing member, or
The bag according to claim 1, wherein an inhibitor is provided on the second surface of the closing member to prevent thermal welding from occurring between the inner surface of the back film. The seal portion includes a pair of side edge seal portions extending along a pair of side edges of the bag,
3. The bag according to claim 1, further comprising a chuck tape attached to at least the inner surface of the surface film and extending from one side edge seal portion of the pair of side edge seal portions to the other side edge seal portion. The listed bag. The content to be filled in the accommodating portion is a fluid having fluidity,
The bag according to any one of claims 1 to 3, further comprising a spout for pouring the fluid. The seal portion includes a pair of side edge seal portions extending along a pair of side edges of the bag,
The bag is formed with a planned opening portion that becomes an outlet by being opened,
The bag according to any one of claims 1 to 4, wherein a width of the planned opening portion is smaller than a distance between a pair of side edge seal portions of the bag. The seal portion includes an upper edge seal portion extending along an upper edge of the bag,
The bag according to any one of claims 1 to 5, wherein a through hole is formed in the upper edge seal portion. The bag further comprises a lower film positioned between the front film and the back film so as to constitute a lower part of the bag,
The bag according to any one of claims 1 to 6, wherein the bottom film is folded so that a folded portion is convex toward the housing portion. A method of manufacturing a bag in which an accommodation portion filled with contents is formed,
Preparing a front film and a back film;
Attaching a closing member to the inner surface of the surface film;
A seal part is formed at least partially between the inner surface of the front film and the inner surface of the back film by heat welding along the outer edge of the front film and the outer edge of the back film, and the housing is accommodated inside the seal part. A step of defining a part,
Among the surface film and the back film in which the opening portion in which the seal portion is formed is formed, at least the surface film has an opening portion penetrating the surface film,
The closing member is attached to the inner surface of the surface film so as to at least partially overlap the opening;
The closing member includes a first surface facing the surface film, and a second surface located on the opposite side of the first surface,
The bag manufacturing method, wherein the first layer constituting the first surface of the closing member is at least partially made of a material that can be thermally welded to the inner surface of the surface film. A bag filled with contents in the container,
At least a front film and a back film,
The accommodating portion is defined inside a seal portion formed at least partially between the inner surface of the front film and the inner surface of the back film by heat welding along the outer edge of the front film and the outer edge of the back film. Made
Each of the surface film and the back film includes a base material layer, and a thermoplastic resin layer provided on the base material layer and constituting the inner surface of the surface film,
Of the surface film and the back film, at least the surface film has an opening formed at a position inside the seal portion that defines the housing portion,
In the opening, at least the base material layer is divided,
The bag further comprises a closing member attached to the inner surface of the surface film so as to at least partially overlap the opening.
The closing member includes a first surface facing the surface film, and a second surface located on the opposite side of the first surface,
Between the first surface of the closing member and the inner surface of the surface film, a seal portion is formed at least partially by heat welding,
The opening is formed by the seal portion between the first surface of the closing member and the inner surface of the surface film, or between the first surface of the closing member and the inner surface of the surface film. The bag surrounded by the combination of the seal portion between the seal portion and the inner surface of the front film and the inner surface of the back film. A method for manufacturing a bag in which a container is filled with contents,
Preparing the bag of claim 1;
A filling step of filling the container with contents through the opening;
A closing step of forming a seal portion by at least partially heat welding the first surface of the closing member and the inner surface of the surface film;
In the closing step, the opening is formed by a seal portion formed by heat welding between the first surface of the closing member and the inner surface of the surface film, or the opening of the closing member. A seal part formed by heat welding between the first surface and the inner surface of the surface film and formed by heat welding between the inner surface of the surface film and the inner surface of the back film. The manufacturing method of a bag implemented so that it may be enclosed by the combination of a seal part. A method for manufacturing a bag in which a container is filled with contents,
A preparation step of preparing a bag in which an opening is formed;
A filling step of filling the container with contents through the opening;
A closing step of forming a seal portion by at least partially heat welding the first surface of the closing member and the inner surface of the surface film;
The preparation step includes
Preparing a front film and a back film;
Attaching a closing member to the inner surface of the surface film;
A seal part is formed at least partially between the inner surface of the front film and the inner surface of the back film by heat welding along the outer edge of the front film and the outer edge of the back film, and the housing is accommodated inside the seal part. A step of defining a part,
Among the surface film and the back film in which the opening portion in which the seal portion is formed is formed, at least the surface film has an opening portion penetrating the surface film,
The closing member is attached to the inner surface of the surface film so as to at least partially overlap the opening;
The closing member includes a first surface facing the surface film, and a second surface located on the opposite side of the first surface,
The first layer constituting the first surface of the closing member is at least partially made of a material that can be thermally welded to the inner surface of the surface film,
In the closing step, the opening is formed by a seal portion formed by heat welding between the first surface of the closing member and the inner surface of the surface film, or the opening of the closing member. A seal part formed by heat welding between the first surface and the inner surface of the surface film and formed by heat welding between the inner surface of the surface film and the inner surface of the back film. The manufacturing method of a bag implemented so that it may be enclosed by the combination of a seal part.

Images