Bag assembly, bag, and method for manufacturing bag

Abstract

To provide a bag assembly, a bag, and a manufacturing method of the bag capable of communicating two storage parts with each other by a simple configuration.SOLUTION: The bag assembly 1 includes a first bag body 10 having a first housing part 11 and a connection member 12 connected to the first housing part 11, and a second bag body 20 having a second housing part 21 and formed with an opening end 25 connectable to the connection member 12. The first weak seal layer 62 is formed on the inner surface of the connecting member 12, and the first weak seal layers 62 are joined to each other. The first strong sealing layer 61 is formed on the outer surface of the connecting member 12. The second weak seal layer 72 is formed on the inner surface of the second bag body 20, and portions of the second weak seal layer 72 are joined to each other at a portion inside the opening end 25 of the second bag body 20.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present disclosure relates to a bag assembly, a bag body, and a method for manufacturing a bag body. [Background technology]

[0002] Conventionally, for example, by connecting a work chamber such as an isolator whose internal space is maintained in a sterile state to a sterile transport container containing materials, the materials can be supplied from the sterile transport container to the work chamber while maintaining the sterile state (see, for example, Patent Document 1).

[0003] Patent document 1 discloses a connection system for space-forming bodies that connects two space-forming bodies whose internal spaces are maintained in a closed state from the outside, thereby communicating the internal spaces of each body while maintaining the closed state. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2023-98371 Summary of the Invention [Problem to be solved by the invention]

[0005] In such a connection system, it is desired to connect the two housing parts to each other using a simple configuration.

[0006] The present disclosure has been made in consideration of these points, and aims to provide a bag assembly, a bag body, and a method for manufacturing a bag body that are capable of connecting two storage sections to each other with a simple configuration. [Means for solving the problem]

[0007] The embodiments of the present disclosure relate to the following [1] to

[14] .

[0008] [1] a first bag body having a first storage portion and a connecting member connected to the first storage portion; a second bag body having a second storage portion and an open end connectable to the connecting member; a first weak seal layer is formed on the inner surface of the connection member, the first weak sealing layers are bonded to each other, a first strong sealing layer is formed on the outer surface of the connection member, a second weak seal layer is formed on the inner surface of the second bag; The bag assembly, wherein the second weak seal layers are joined to each other at a portion inside the open end of the second bag body.

[0009] [2] The bag assembly according to [1], wherein at least a portion of the joint between the first weak sealing layers and the joint between the second weak sealing layers each protrudes toward the first storage section when viewed in a plane.

[0010] [3] The bag assembly described in [2], wherein an obstructing element that obstructs the joining of the first weak sealing layers is provided on the first storage section side of the connecting member relative to the joint between the first weak sealing layers.

[0011] [4] [1] The bag assembly according to [1] is provided, With the connecting member housed inside the second bag body, the second weak sealing layer and the first strong sealing layer are joined to each other, The bag body has an open end of the connection member and a joint portion between the second weak seal layers joined together.

[0012] [5] a second strong sealing layer is formed on the inner surface of the first housing portion; The bag according to [4], wherein the second strong sealing layer and the first strong sealing layer are joined to each other.

[0013] [6] The bag body described in [4] or [5], wherein the joints between the first weak sealing layers and the joints between the second weak sealing layers are each partially peeled off, and the first storage section and the second storage section are connected to each other.

[0014] [7] A bag body according to any one of [4] to [6], wherein the seal strength of the joint between the first weak seal layers is 0.15 times or more and less than 1 times the seal strength of the joint between the second weak seal layer and the first strong seal layer.

[0015] [8] A bag body according to any one of [4] to [7], wherein the seal strength of the joint between the second weak seal layers is 0.15 times or more and less than 1 time the seal strength of the joint between the second weak seal layer and the first strong seal layer.

[0016] [9] A bag body described in any one of [4] to [8], wherein the joints between the first weak sealing layers, the joints between the opening ends of the connecting member and the joints between the second weak sealing layers, and the joints between the second weak sealing layers each have at least a portion that protrude toward the first storage section when viewed in a plane.

[0017]

[10] [9] The bag assembly described in [9], wherein an obstructing element that obstructs the joining of the first weak sealing layers is provided on the first storage section side of the connecting member relative to the joint between the first weak sealing layers.

[0018]

[11] In a method for manufacturing a bag using the bag assembly according to [1], placing the connecting member inside the second bag; and heat-sealing the open end of the connecting member and the second weak seal layer from the outside of the second bag body.

[0019]

[12]

[11] A method for manufacturing a bag body described in

[11] , wherein the joints between the first weak sealing layers, the joints between the opening ends of the connecting member and the joints between the second weak sealing layers, and the joints between the second weak sealing layers each have at least a portion protruding toward the first storage section when viewed in a plane.

[0020]

[13] A method for manufacturing a bag body as described in

[12] , in which an obstructing element that obstructs the joining of the first weak sealing layers is provided on the first storage section side of the connecting member relative to the joint between the first weak sealing layers.

[0021]

[14] The method for manufacturing a bag body described in any one of

[11] to

[13] further includes a step of partially peeling off the joint between the first weak sealing layers and the joint between the second weak sealing layers, thereby connecting the first storage section and the second storage section to each other. [Effects of the Invention]

[0022] According to the present disclosure, two storage sections can be connected to each other with a simple configuration. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 1 is a plan view showing a bag assembly according to a first embodiment. [Figure 2] FIG. 2 is a plan view showing a first bag body of the bag combination according to the first embodiment. [Figure 3] FIG. 3 is a cross-sectional view showing a resin film that constitutes the first storage section of the first bag body of the bag assembly according to the first embodiment. [Figure 4A] FIG. 4A is a cross-sectional view showing a resin film that constitutes the connecting member of the first bag body of the bag assembly according to the first embodiment. [Figure 4B] FIG. 4B is a cross-sectional view showing another example of a resin film constituting the connecting member of the first bag body of the bag assembly according to the first embodiment. [Figure 5]FIG. 5 is a cross-sectional view (cross-sectional view taken along line VV in FIG. 2) showing the first bag body of the bag combination according to the first embodiment. [Figure 6] FIG. 6 is a plan view showing the second bag body of the bag combination according to the first embodiment. [Figure 7] FIG. 7 is a cross-sectional view showing a resin film that constitutes the second bag body of the bag assembly according to the first embodiment. [Figure 8] FIG. 8 is a cross-sectional view (cross-sectional view taken along line VIII-VIII in FIG. 1) showing the bag assembly according to the first embodiment. [Figure 9] FIG. 9 is a plan view showing the bag according to the first embodiment. [Figure 10] FIG. 10 is a cross-sectional view (cross-sectional view taken along line XX in FIG. 9) showing the bag according to the first embodiment. [Figure 11] 11(a) to 11(d) are plan views showing a method for manufacturing a bag according to the first embodiment. [Figure 12] 12(a) and 12(b) are cross-sectional views showing how to use the bag according to the first embodiment. [Figure 13] FIG. 13 is a plan view showing a modified example of the second bag body of the bag combination according to the first embodiment. [Figure 14] FIG. 14 is a plan view showing a modified example of the bag combination according to the first embodiment. [Figure 15] FIG. 15 is a plan view showing a modified example of the bag body according to the first embodiment. [Figure 16] FIG. 16 is a plan view showing a bag combination according to the second embodiment. [Figure 17] FIG. 17 is a plan view showing a first bag body of the bag combination according to the second embodiment. [Figure 18] FIG. 18 is a cross-sectional view (cross-sectional view taken along line XVIII-XVIII in FIG. 17) showing the first bag body of the bag combination according to the second embodiment. [Figure 19] FIG. 19 is a plan view showing the second bag body of the bag combination according to the second embodiment. [Figure 20]FIG. 20 is a cross-sectional view (cross-sectional view taken along line XX-XX in FIG. 16) showing the bag assembly according to the second embodiment. [Figure 21] FIG. 21 is a plan view showing a bag according to the second embodiment. [Figure 22] FIG. 22 is a cross-sectional view (cross-sectional view taken along line XXII-XXII in FIG. 21) showing the bag according to the second embodiment. [Figure 23] 23(a) to 23(e) are plan views showing a method for manufacturing a bag according to the second embodiment. [Figure 24] 24(a) and 24(b) are cross-sectional views showing how to use the bag according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0024] (First embodiment) The first embodiment will be described below with reference to the drawings. FIGS. 1 to 12 are diagrams illustrating the first embodiment. The following figures are schematic illustrations. Therefore, the size and shape of each part are appropriately exaggerated for ease of understanding. Furthermore, appropriate modifications can be made within the scope of the technical concept. In the following figures, identical parts are denoted by the same reference numerals, and some detailed descriptions may be omitted. Furthermore, the numerical values, such as dimensions, and material names of each component described in this specification are examples of an embodiment, and are not limited to these and may be selected and used as appropriate. In this specification, terms specifying shapes or geometric conditions, such as parallel, orthogonal, and perpendicular, are interpreted not only strictly but also to include substantially the same state.

[0025] <Bag assembly> First, a bag assembly 1 according to a first embodiment of the present disclosure will be described with reference to FIGS.

[0026] As shown in Fig. 1, the bag combination 1 includes a first bag body 10 and a second bag body 20. First, the first bag body 10 will be described.

[0027] <<First bag>> As shown in FIGS. 1 and 2, the first bag body 10 has a first storage portion 11 and a connecting member 12 connected to the first storage portion 11.

[0028] As shown in FIG. 2, the first housing portion 11 includes a first end 11a, a second end 11b facing the first end 11a in the first direction D1, and a third end 11c and a fourth end 11d extending along the first direction D1 from the first end 11a to the second end 11b. In the example shown in FIG. 2, the first end 11a and the second end 11b extend along a second direction D2 perpendicular to the first direction D1, and the first housing portion 11 is rectangular in plan view. The first housing portion 11 may be formed in a substantially rectangular box shape. Although not shown, the first end 11a and the second end 11b may extend in a direction inclined with respect to the second direction D2.

[0029] A second strong sealing layer 52 (see FIG. 3) is formed on the inner surface of the first storage section 11. In this case, the first storage section 11 may be made of a resin film 50 shown in FIG. 3. As shown in FIG. 3, the resin film 50 includes a first stretched substrate 51 that forms the outer surface of the first storage section 11 and a second strong sealing layer 52 that forms the inner surface of the first storage section 11. The first storage section 11 is made by overlapping and bonding the resin films 50 together so that the second strong sealing layers 52 of the resin films 50 face each other. The second strong sealing layers 52 are bonded to each other near the fourth end 11d. As a result, as shown in FIG. 2, a first strong sealing portion 42 is formed at the fourth end 11d of the first storage section 11. A connecting member 12 is connected to the fourth end 11d.

[0030] The connecting member 12 includes a first end 12a, a second end 12b facing the first end 12a in the first direction D1, and a third end 12c and a fourth end (open end) 12d extending along the first direction D1 from the first end 12a to the second end 12b. In the example shown in FIG. 2, the first end 12a and the second end 12b extend along the second direction D2, and the connecting member 12 is rectangular in plan view. The lengths of the third end 12c and the fourth end 12d of the connecting member 12 are shorter than the lengths of the third end 11c and the fourth end 11d of the first housing portion 11, respectively. Although not shown, the first end 12a and the second end 12b may extend in a direction inclined with respect to the second direction D2.

[0031] A first weak sealing layer 62 (see FIGS. 4A and 4B) is formed on the inner surface of the connecting member 12. A first strong sealing layer 61 (see FIGS. 4A and 4B) is formed on the outer surface of the connecting member 12. In this case, the connecting member 12 may be made of a resin film 60 shown in FIG. 4A. As shown in FIG. 4A, the resin film 60 includes a first strong sealing layer 61 that forms the outer surface of the connecting member 12, a first weak sealing layer 62 that forms the inner surface of the connecting member 12, and a second stretched substrate 63 located between the first strong sealing layer 61 and the first weak sealing layer 62. The connecting member 12 is made by overlapping and bonding resin films 60 together so that the first weak sealing layers 62 of the resin films 60 face each other. The connecting member 12 may also be made of a resin film 60 shown in FIG. 4B. 4B, the resin film 60 includes a first strong sealing layer 61 that forms the outer surface of the connecting member 12, and a first weak sealing layer 62 that forms the inner surface of the connecting member 12. In other words, the resin film 60 does not necessarily include the second stretched base material 63 described above.

[0032] As shown in Fig. 5, the first weak seal layers 62 are joined to each other near the fourth end 12d. As a result, a first weak seal portion 31 (a joint portion between the first weak seal layers 62) is formed at the fourth end 12d of the connecting member 12. In this embodiment, as shown in Figs. 1 and 2, the first weak seal portion 31 has a rectangular shape extending along the first direction D1 in plan view.

[0033] Furthermore, the first strong seal layer 61 and the second strong seal layer 52 of the first housing portion 11 are joined to each other near the third end 12c of the connecting member 12 and the fourth end 11d of the first housing portion 11. As a result, a second strong seal portion 43 is formed near the third end 12c of the connecting member 12 and the fourth end 11d of the first housing portion 11. In this manner, the first housing portion 11 and the connecting member 12 are joined to each other via the second strong seal portion 43. Note that, at positions of the second strong seal portion 43 corresponding to both ends in the first direction D1, the first weak seal layers 62 are joined to each other (not shown). As a result, at positions of the second strong seal portion 43 corresponding to both ends in the first direction D1, weak seal portions (not shown) are formed in which the first weak seal layers 62 of the connecting member 12 are joined to each other. Furthermore, at positions of the second strong seal portion 43 corresponding to both ends in the first direction D1, the first end 12a and the second end 12b of the connecting member 12 are joined to the second strong seal layer 52 of the first accommodating portion 11. Therefore, the first accommodating portion 11 and the connecting member 12 are communicated with each other while maintaining hermeticity by the first strong seal portion 42, the second strong seal portion 43, and the above-mentioned weak seal portion (not shown), etc.

[0034] As described above, the first accommodating section 11 and the connecting member 12 are joined to each other via the second strong seal portion 43. Unlike the connecting member 12, the first accommodating section 11 is not a part that is connected to the second bag body 20. Therefore, an inexpensive material may be used for the first accommodating section 11. By using an inexpensive material for the first accommodating section 11 in this way, the manufacturing cost of the first bag body 10 can be reduced. Although not shown, the first accommodating section 11 may be formed integrally with the connecting member 12 using the same material as the connecting member 12.

[0035] <<Second bag>> 1 and 6, the second bag body 20 has a second storage section 21. The second bag body 20 also has an open end 25 that can be connected to the connecting member 12 of the first bag body 10.

[0036] As shown in FIG. 6, the second bag body 20 includes a first end 20a, a second end 20b opposite the first end 20a in the first direction D1, and a third end 20c (opening end 25) and a fourth end 20d extending along the first direction D1 from the first end 20a to the second end 20b. In the example shown in FIG. 6, the first end 20a and the second end 20b extend along the second direction D2, and the second storage section 21 is rectangular in plan view. The lengths of the third end 20c and the fourth end 20d of the second bag body 20 are longer than the lengths of the third end 12c and the fourth end 12d of the connecting member 12, respectively. Although not shown, the first end 20a and the second end 20b may extend in a direction inclined with respect to the second direction D2.

[0037] A second weak sealing layer 72 (see FIG. 7) is formed on the inner surface of the second storage section 21 (second bag body 20). In this case, the second bag body 20 may be made from a resin film 70 shown in FIG. 7. As shown in FIG. 7, the resin film 70 includes a third stretched base material 71 that forms the outer surface of the second bag body 20, and a second weak sealing layer 72 that forms the inner surface of the second bag body 20. The second bag body 20 is made by overlapping and bonding the resin films 70 together so that the second weak sealing layers 72 of the resin films 70 face each other.

[0038] In this embodiment, as shown in Fig. 8, the second weak seal layers 72 are joined to each other in a portion inside the third end 20c (opening end 25) of the second bag body 20. As a result, a second weak seal portion 32 (a joint portion between the second weak seal layers 72) is formed in a portion inside the third end 20c (opening end 25) of the second bag body 20. In this embodiment, as shown in Figs. 1 and 6, the second weak seal portion 32 has a rectangular shape extending along the first direction D1 in plan view. In this case, the length L from the third end 20c of the second bag body 20 to the second weak seal portion 32 in the second direction D2 (see Figs. 6 and 8) is longer than the width W of the first weak seal portion 31 (the length along the second direction D2 (see Fig. 8)).

[0039] <Bag body> Next, a bag body 1A according to this embodiment will be described with reference to FIGS.

[0040] As shown in FIG. 9, a bag body 1A includes the above-described bag combination body 1.

[0041] As shown in FIG. 10 , in the bag body 1A, the second weak seal layer 72 of the second bag body 20 and the first strong seal layer 61 of the first bag body 10 are joined to each other with the connecting member 12 housed inside the second bag body 20. The connecting member 12 is housed inside the second bag body 20 from the third end 20c (opening end 25) of the second bag body 20. The connecting member 12 is housed inside the second bag body 20 so that its fourth end 12d faces the joint between the second weak seal layers 72 of the second bag body 20. In this way, as shown in FIGS. 9 and 10 , a non-weak seal portion 41 (the joint between the second weak seal layer 72 and the first strong seal layer 61) is formed at the fourth end 12d of the connecting member 12 of the first bag body 10. In this embodiment, as shown in FIG. 9 , the non-weak seal portion 41 has a rectangular shape extending along the first direction D1 in a plan view.

[0042] 9, the bag body 1A has third weak seal portions 33 formed in positions adjacent to the non-weak seal portions 41 in the first direction D1. That is, when viewed along the first direction D1, the third weak seal portions 33 are formed in positions overlapping the non-weak seal portions 41. In other words, the third weak seal portions 33 are formed closer to the third end 20c (opening edge 25) than the second weak seal portions 32. In this embodiment, as shown in FIG. 9, the third weak seal portions 33 are rectangular in plan view extending along the first direction D1. When viewed along the first direction D1, the third weak seal portions 33 are portions where the second weak seal layers 72 of the second bag body 20 are joined together at positions adjacent to the non-weak seal portions 41.

[0043] 9 and 10, the fourth end (opening end) 12d of the connecting member 12 and the joint between the second weak seal layers 72 are joined together. That is, the fourth end (opening end) 12d of the connecting member 12 and the second weak seal portion 32 are joined together. This forms the fourth weak seal portion 34. In this embodiment, as shown in FIG. 9, the fourth weak seal portion 34 is a rectangle extending along the first direction D1 in plan view. This fourth weak seal portion 34 is formed by melting the second weak seal portion 32 and the resin film 60. In other words, in the bag body 1A, a portion of the second weak seal portion 32 of the bag assembly 1 forms the fourth weak seal portion 34 by melting. Furthermore, most of this fourth weak seal portion 34 is formed from the material that forms the second weak seal portion 32. In this case, the seal strength of the fourth weak seal portion 34 can be approximately the same as the seal strength of the second weak seal portion 32.

[0044] A gap (not shown) may be formed between the fourth end (opening end) 12d of the connecting member 12 and the joint between the second weak seal layers 72. That is, the fourth end (opening end) 12d of the connecting member 12 and the joint between the second weak seal layers 72 may be joined to each other via a gap. In this case, the gap is sealed by the first weak seal portion 31, the third weak seal portion 33, the fourth weak seal portion 34, and the non-weak seal portion 41.

[0045] Next, each seal portion will be described in detail.

[0046] 9, the bag body 1A is formed with a first weak seal portion 31, a second weak seal portion 32, a third weak seal portion 33, and a fourth weak seal portion 34. In the following description, the first weak seal portion 31, the second weak seal portion 32, the third weak seal portion 33, and the fourth weak seal portion 34 will also be simply referred to as weak seal portions.

[0047] The weak seal portions described above have a seal strength weaker than the non-weak seal portion 41, the first strong seal portion 42, and the second strong seal portion 43. In this case, the seal strength of the weak seal portion is 0.15 times or more and less than 1 time the seal strength of the non-weak seal portion 41. Of these, the first weak seal portion 31, the second weak seal portion 32, and the fourth weak seal portion 34 (hereinafter simply referred to as the first weak seal portion 31, etc.) are intended to be torn off when the user uses (opens) the bag 1A. This allows the user to easily open the first weak seal portion 31, etc. when removing the contents from the second storage section 21 of the second bag 20.

[0048] The seal strength of the first weak seal portion 31, the second weak seal portion 32, and the fourth weak seal portion 34 is preferably strong enough to allow a user to manually open the first weak seal portion 31, the second weak seal portion 32, and the fourth weak seal portion 34. The seal strength of the first weak seal portion 31, etc. is preferably 1 N / 15 mm or more and 15 N / 15 mm or less. When the seal strength of the first weak seal portion 31, etc. is 1 N / 15 mm or more, the user can manually open the first weak seal portion 31, etc. while maintaining the airtightness (sterility) of the second storage portion 21. Furthermore, when the seal strength of the first weak seal portion 31, etc. is 15 N / 15 mm or less, the problem of the user being unable to manually open the first weak seal portion 31, etc. can be prevented.

[0049] Of the weak seal portions described above, the third weak seal portion 33 is not intended to be torn off when the user uses (opens) the bag 1A. Even in this type of third weak seal portion 33, the seal strength of the third weak seal portion 33 may be substantially the same as the seal strength of the first weak seal portion 31, etc.

[0050] As shown in FIG. 9, the bag 1A has a weakly sealed portion 41, a first strong sealed portion 42, and a second strong sealed portion 43 formed therein.

[0051] The non-weak sealed portion 41 is a portion that is not intended to be opened and has a seal strength greater than that of the weak sealed portion. In this way, the difference in seal strength between the weak sealed portion and the non-weak sealed portion 41 makes it easier to control the opening position. This makes it possible to remove the contents from the second storage portion 21 while maintaining the airtightness (sterility) of the second storage portion 21, as will be described later.

[0052] The seal strength of such a non-weak seal portion 41 is preferably strong enough to prevent a user from opening the non-weak seal portion 41 by hand. The seal strength of the non-weak seal portion 41 may be 5 N / 15 mm or more and 150 N / 15 mm or less, and is preferably 20 N / 15 mm or more and 150 N / 15 mm or less. A seal strength of the non-weak seal portion 41 of 20 N / 15 mm or more makes it difficult for a user to open the non-weak seal portion 41. Furthermore, a seal strength of the non-weak seal portion 41 of 150 N / 15 mm or less prevents the resin film 50 and the resin film 60 from becoming too thick. That is, when increasing the seal strength, it is common to change the material constituting the seal layer or increase the thickness of the seal layer. In contrast, a seal strength of the non-weak seal portion 41 of 150 N / 15 mm or less prevents the resin film 50 and the resin film 60 from becoming too thick. This reduces the cost of producing the bag body 1A.

[0053] 9, the bag 1A is formed with a first strong seal portion 42 and a second strong seal portion 43. In the following description, the first strong seal portion 42 and the second strong seal portion 43 will also be referred to simply as the strong seal portion.

[0054] The strong seal portion is a portion that is not intended to be opened and has a stronger seal strength than the weak seal portion. The difference in seal strength between the weak seal portion and the strong seal portion makes it easier to control the opening position. This allows the contents to be removed from the second storage portion 21 while maintaining the airtightness (sterility) of the second storage portion 21, as described below.

[0055] The seal strength of such a strong seal portion is preferably strong enough that a user cannot open the strong seal portion by hand. The seal strength of the strong seal portion is preferably 20 N / 15 mm or more and 150 N / 15 mm or less. A seal strength of 20 N / 15 mm or more makes it difficult for a user to open the strong seal portion. Furthermore, a seal strength of 150 N / 15 mm or less prevents the resin film 50 and the resin film 60 from becoming too thick. That is, when increasing the seal strength, it is common to change the material constituting the seal layer or increase the thickness of the seal layer. In contrast, a seal strength of 150 N / 15 mm or less prevents the resin film 50 and the resin film 60 from becoming too thick. This reduces the cost of producing the bag body 1A.

[0056] The method for forming each sealed portion is not particularly limited. For example, each sealed portion may be formed by melting a portion of the resin films 50, 60, 70 by heating or the like. In this case, known heat sealing methods may be used, such as bar sealing, rotary roll sealing, belt sealing, impulse sealing, high-frequency sealing, and ultrasonic sealing. The width of each sealed portion may be, for example, 2 mm or more and 20 mm or less. The first bag body 10 and the second bag body 20 may further have a sealed portion (not shown).

[0057] <<<Resin film composition>>>

[0058] Hereinafter, each layer constituting the resin films 50, 60, and 70 will be described.

[0059] (1st stretched base material, 2nd stretched base material, 3rd stretched base material) The first stretched substrate 51 is, for example, a layer that supports the second strong seal layer 52 and increases the strength of the entire resin film 50. The second stretched substrate 63 is, for example, a layer that improves the openability of the first weak seal portion 31, as will be described later. The second stretched substrate 63 is, for example, a layer that supports the first strong seal layer 61 and the first weak seal layer 62 and increases the strength of the entire resin film 60. The third stretched substrate 71 is, for example, a layer that supports the second weak seal layer 72 and increases the strength of the entire resin film 70. In the following description, the first stretched substrate 51, the second stretched substrate 63, and the third stretched substrate 71 will also be simply referred to as the first stretched substrate 51, etc.

[0060] Examples of materials that can be used to form the first stretched substrate 51 include films or sheets of polyamide resin, polyester resin, or polyolefin resin. Examples of polyamide resins include nylon. Examples of polyester resins include polyethylene terephthalate and polybutylene terephthalate. Examples of polyolefin resins include polyethylene and polypropylene.

[0061] Of the above-mentioned resin films or sheets, stretched films stretched uniaxially or biaxially are used for the first stretched substrate 51, the second stretched substrate 63, and the third stretched substrate 71. By using a stretched film for the second stretched substrate 63, the resin film 60 is less likely to stretch when the first weak seal portion 31 and the second weak seal portion 32 are opened. This makes it easier to open the first weak seal portion 31 and the second weak seal portion 32.

[0062] The tensile strength of the stretched film may be 40 MPa or more and 320 MPa or less, and the tensile modulus may be 950 MPa or more and 4200 MPa or less. For example, when the stretched film is a polyethylene terephthalate (PET) film, the tensile strength may be 40 MPa or more and 80 MPa or less, and the tensile modulus may be 2800 MPa or more and 4200 MPa or less. When the stretched film is a nylon (ONY) film, the tensile strength may be 210 MPa or more and 290 MPa or less, and the tensile modulus may be 950 MPa or more and 1600 MPa or less. When the stretched film is a polypropylene (OPP) film, the tensile strength may be 130 MPa or more and 320 MPa or less, and the tensile modulus may be 1700 MPa or more and 3900 MPa or less. The tensile strength and tensile modulus are measured in accordance with JIS K7127.

[0063] The thickness of each of the first stretchable substrates 51 and the like may be, for example, 5 μm or more and 50 μm or less.

[0064] (First weak seal layer, second weak seal layer) The first weak sealing layer 62 and the second weak sealing layer 72 are layers for joining resin films 60 together or resin films 70 together. The materials constituting the first weak sealing layer 62 and the second weak sealing layer 72 may be any resin material that melts and fuses with heat and exhibits so-called easy-peel properties. By using a resin material that exhibits so-called easy-peel properties as the materials constituting the first weak sealing layer 62 and the second weak sealing layer 72, the seal strength of the weak seal portion described above can be made lower than the seal strength of the non-weak seal portion 41 described above. The first weak sealing layer 62 and the second weak sealing layer 72 may each be composed of a single layer or multiple layers. When the first weak sealing layer 62 and the second weak sealing layer 72 are composed of multiple layers, the material of the layer constituting the inner surface of the connecting member 12 and the material of the layer constituting the inner surface of the second bag body 20 may be any resin material that exhibits so-called easy-peel properties.

[0065] In this case, the first weak sealing layer 62 and the second weak sealing layer 72 may be made of, for example, a low-density polyethylene (LDPE) film, a medium-density polyethylene (MDPE) film, a high-density polyethylene (HDPE) film, a linear low-density polyethylene (LLDPE) film, a polypropylene film, an acid-modified polyolefin resin film in which a polyolefin resin such as polyethylene or polypropylene is modified with acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, or other unsaturated carboxylic acid, a polyvinyl acetate resin film, a polyester resin film, a polystyrene resin film, or a film made of one or more other resins such as polyacrylonitrile, saturated polyester, or polyvinyl alcohol.

[0066] In addition, the materials constituting the above-mentioned first weak sealing layer 62 and second weak sealing layer 72 may be made by optionally adding, for example, an antiblocking agent, a lubricant (fatty acid amide, etc.), a flame retardant, an inorganic or organic filler, etc.

[0067] The thickness of each of the first weak sealing layer 62 and the second weak sealing layer 72 may be 20 μm or more and 150 μm or less.

[0068] (First strong sealing layer, second strong sealing layer) The first strong sealing layer 61 is a layer for bonding the resin film 60 and the resin film 70 to each other. The second strong sealing layer 52 is a layer for bonding the resin film 50 and the resin film 60 to each other. The materials constituting the first strong sealing layer 61 and the second strong sealing layer 52 may be any resin material that melts and fuses when heated. The first strong sealing layer 61 and the second strong sealing layer 52 may each be composed of a single layer or multiple layers.

[0069] In this case, the first strong sealing layer 61 and the second strong sealing layer 52 may be made of, for example, a low-density polyethylene (LDPE) film, a medium-density polyethylene (MDPE) film, a high-density polyethylene (HDPE) film, a linear low-density polyethylene (LLDPE) film, a polypropylene film, an acid-modified polyolefin resin film obtained by modifying a polyolefin resin such as polyethylene or polypropylene with acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, or other unsaturated carboxylic acid, a polyvinyl acetate resin film, a polyester resin film, a polystyrene resin film, or a film made of one or more other resins such as polyacrylonitrile, saturated polyester, or polyvinyl alcohol.

[0070] The materials constituting the first strong sealing layer 61 and the second strong sealing layer 52 may contain, for example, an antiblocking agent, a lubricant (fatty acid amide, etc.), a flame retardant, an inorganic or organic filler, etc., optionally added thereto.

[0071] The thickness of each of the first strong sealing layer 61 and the second strong sealing layer 52 may be 30 μm or more and 250 μm or less.

[0072] The above-described layers may be bonded together via an adhesive layer (not shown). The adhesive layer is a layer formed to bond any two layers together by lamination. This adhesive layer may be an adhesive layer or a thermoplastic resin layer. Examples of laminating adhesives that can be used include one-component or two-component curing or non-curing vinyl, (meth)acrylic, polyamide, polyester, polyether, polyurethane, epoxy, rubber, and other solvent-based, water-based, or emulsion-based laminating adhesives. Examples of coating methods for the adhesives include direct gravure roll coating, gravure roll coating, kiss coating, reverse roll coating, Fountain coating, transfer roll coating, and other methods. Furthermore, the thermoplastic resin layer may be made of the same material as the first weak seal layer 62, for example.

[0073] Although not shown, the resin films 50, 60, 70 may also have other layers such as a print layer (pattern layer) or a barrier layer.

[0074] The bag 1A shown in Fig. 9 can be suitably used, for example, when removing contents accommodated in the second bag 20 while maintaining sterility. In this case, pre-sterilized contents are accommodated in the second bag 20. Furthermore, the first bag 10 and the second bag 20 have been sterilized in advance by gamma rays or the like, and the insides of the first bag 10 and the second bag 20 are each maintained in sterility. Examples of contents accommodated in the second bag 20 include tools for culture operations.

[0075] Next, the operation of the bag body 1A according to the present embodiment having such a configuration will be described. First, a method for manufacturing and using the bag body 1A shown in Fig. 9 will be described with reference to Figs. 11(a)-(d) and 12(a)-(b).

[0076] First, as shown in FIG. 11(a), a first bag 10 and a second bag 20 are prepared. The first bag 10 can be produced by applying a predetermined heat sealing method to a resin film 50 and a resin film 60. The second bag 20 can be produced by applying a predetermined heat sealing method to a resin film 70. Furthermore, the first bag 10 and the second bag 20 have been sterilized in advance by gamma rays or the like, and the insides of the first bag 10 and the second bag 20 are kept sterile. Furthermore, the second bag 20 contains contents that have been sterilized in advance.

[0077] 11(b), the connecting member 12 is placed inside the second bag body 20. At this time, the connecting member 12 is housed inside the second bag body 20 from the third end 20c (opening end 25) of the second bag body 20 so that the fourth end 12d faces the joint between the second weak seal layers 72 of the second bag body 20.

[0078] 11(c), the fourth end (opening end) 12d of the connecting member 12 and the second weak seal layer 72 are heat-sealed from the outside of the second bag body 20. At this time, the fourth end 12d of the connecting member 12 and the second weak seal layer 72 are sandwiched between the fourth end 12d of the connecting member 12 and the second weak seal layer 72 from the outside of the second bag body 20 by a seal bar B. At this time, the seal bar B is positioned so that it straddles the first weak seal portion 31 of the first bag body 10 and the second weak seal portion 32 of the second bag body 20 in a plan view.

[0079] In this way, the first bag body 10 and the second bag body 20 are heat-sealed together. At this time, the seal bar B forms a non-weak sealed portion 41, a third weak sealed portion 33, and a fourth weak sealed portion 34, as shown in Fig. 11(d).

[0080] When removing the contents from the second bag body 20, the joints between the first weak seal layers 62 (first weak seal portion 31) and the joints between the second weak seal layers 72 (second weak seal portion 32 and fourth weak seal portion 34) are partially peeled off, thereby connecting the first storage section 11 and the second storage section 21 to each other.

[0081] At this time, for example, as shown in FIG. 12(a), the user pulls the resin film 70 that constitutes the second bag 20. At this time, the user pulls the resin film 70 while pinching the vicinity of the third end 20c (opening end 25) of the second bag 20. As a result, a force is applied to the first weak seal portion 31 of the first bag 10 to open the first weak seal portion 31. In other words, the first bag 10 is joined to the second bag 20 via the non-weak seal portion 41. Therefore, when the user pulls the resin film 70, a force is applied to the first weak seal portion 31 of the first bag 10. Furthermore, when the user pulls the resin film 70, a force is also applied to the fourth weak seal portion 34 and the second weak seal portion 32. At this time, the user may press down one of the resin films 60 (the lower resin film 60 in FIG. 12(a)) by inserting a finger between the resin films 60 from the outside of the first bag body 10. Furthermore, when removing the contents from the second bag body 20, the user may partially peel off the first weak seal portion 31, etc., by inserting a finger between the resin films 60 from the outside of the first bag body 10 without pulling the resin film 70.

[0082] 12(b), the first weak seal portion 31, the fourth weak seal portion 34, and the second weak seal portion 32 are each unsealed. At this time, approximately the center in the first direction D1 of each of the first weak seal portion 31, the fourth weak seal portion 34, and the second weak seal portion 32 is partially unsealed. This prevents the third weak seal portion 33 from being unsealed, and maintains the airtightness inside the second bag body 20.

[0083] As described above, the first bag 10 is joined to the second bag 20 via the non-weak seal portion 41. This non-weak seal portion 41 has a stronger seal strength than the weak seal portion. Therefore, even if a user pulls the resin film 70, the non-weak seal portion 41 will not be opened. Therefore, the contents in the second bag 20 can be removed into the first storage section 11 while the sealability of the second bag 20 is maintained.

[0084] In this embodiment, a bag body 1A is also provided in which the joints between the first weak sealing layers 62 and the joints between the second weak sealing layers 72 are each partially peeled off, and the first storage section 11 and the second storage section 21 are connected to each other.

[0085] As described above, according to the present embodiment, the bag assembly 1 of the bag body 1A includes a first bag body 10 having a first storage section 11 and a connecting member 12 connected to the first storage section 11, and a second bag body 20 having a second storage section 21 and formed with an open end 25 connectable to the connecting member 12. Furthermore, first weak sealing layers 62 are formed on the inner surface of the connecting member 12, and the first weak sealing layers 62 are joined to each other. Furthermore, a first strong sealing layer 61 is formed on the outer surface of the connecting member 12. Furthermore, second weak sealing layers 72 are formed on the inner surface of the second bag body 20, and the second weak sealing layers 72 are joined to each other at a portion of the second bag body 20 that is more inward than the open end 25. Furthermore, with the connecting member 12 housed inside the second bag body 20, the second weak sealing layer 72 and the first strong sealing layer 61 are joined to each other. Furthermore, the fourth end 12d of the connecting member 12 and the joint between the second weak seal layers 72 are joined together. This allows the joint between the first weak seal layers 62 (first weak seal portion 31) and the joint between the second weak seal layers 72 (second weak seal portion 32 and fourth weak seal portion 34) to be partially peeled apart without peeling apart the joint between the second weak seal layer 72 and the first strong seal layer 61 (non-weak seal portion 41). This allows the first storage section 11 and the second storage section 21 to be connected to each other while maintaining the airtightness inside the second bag body 20. As a result, the contents inside the second bag body 20 can be removed into the first storage section 11.

[0086] In the above-described embodiment, an example has been described in which the length L from the third end 20c of the second bag body 20 to the second weak seal portion 32 is longer than the width W of the first weak seal portion 31, but this is not limiting. For example, as shown in Figures 13 to 15, the length L from the third end 20c of the second bag body 20 to the second weak seal portion 32 may be equal to the width W of the first weak seal portion 31.

[0087] In this modified example, when removing the contents from the second bag body 20, the user may partially peel off the first weak seal portion 31, the second weak seal portion 32, and the fourth weak seal portion 34 by inserting a finger between the resin films 60 from the outside of the first bag body 10.

[0088] The length L from the third end 20c of the second bag body 20 to the second weak seal portion 32 may be any length that allows the formation of the above-mentioned non-weak seal portion 41. Therefore, the length L from the third end 20c of the second bag body 20 to the second weak seal portion 32 may be shorter than the width W of the first weak seal portion 31.

[0089] In this modification as well, the first weak seal portion 31, the second weak seal portion 32, and the fourth weak seal portion 34 can be partially peeled off without peeling off the non-weak seal portion 41. This allows the first storage portion 11 and the second storage portion 21 to communicate with each other while maintaining the airtightness inside the second bag body 20. As a result, the contents inside the second bag body 20 can be removed into the first storage portion 11.

[0090] (Second embodiment) Next, a second embodiment will be described with reference to Figures 16 to 24. The second embodiment shown in Figures 16 to 24 differs from the first embodiment mainly in the configuration of the joints (first weak seal portions 31) between the first weak seal layers 62. In Figures 16 to 24, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0091] <Bag assembly> First, a bag combination 1 according to a second embodiment of the present disclosure will be described with reference to FIGS.

[0092] As shown in Fig. 16, in this embodiment as well, the bag combination 1 includes a first bag body 10 and a second bag body 20. Here, first, the first bag body 10 will be described.

[0093] <<First bag>> 17, in the present embodiment, at least a portion of fourth end (open end) 12d of connection member 12 protrudes toward first housing portion 11 in plan view. In the illustrated example, fourth end 12d of connection member 12 has a V-shape with its tip (apex) facing toward first housing portion 11 in plan view. However, without being limited to this, fourth end 12d may have a U-shape with its tip facing toward first housing portion 11, or may have a zigzag shape.

[0094] 16 and 17, in this embodiment as well, the first weak seal layers 62 are joined to each other near the fourth end 12d. As a result, a first weak seal portion 31 (joint portion between the first weak seal layers 62) is formed at the fourth end 12d of the connecting member 12. In this embodiment, at least a portion of the first weak seal portion 31 (joint portion between the first weak seal layers 62) protrudes toward the first housing section 11 in a plan view. In the illustrated example, the first weak seal portion 31 (joint portion between the first weak seal layers 62) has a V-shape with its tip (apex) facing toward the first housing section 11 in a plan view. However, the first weak seal portion 31 may have a U-shape with its tip facing toward the first housing section 11, or a zigzag shape.

[0095] 16 to 18, in this embodiment, an inhibiting element (separator 13) that inhibits bonding of the first weak seal layers 62 to each other is provided in the connecting member 12 on the first housing section 11 side of the first weak seal portion 31 (the joint portion between the first weak seal layers 62). This separator 13 is provided inside the connecting member 12. The separator 13 serves to prevent the first weak seal layers 62 from being bonded to each other on the first housing section 11 side of the first weak seal portion 31 when the fourth end (opening end) 12d of the connecting member 12 and the second weak seal layer 72 are heat-sealed.

[0096] The separator 13 has a shape corresponding to the first weak seal portion 31. That is, of the ends of the separator 13, the end facing the first weak seal portion 31 is at least partially recessed toward the first accommodating section 11 in a plan view. In other words, of the ends of the separator 13, the end facing the first weak seal portion 31 is at least partially recessed toward the first accommodating section 11 in a plan view. In the illustrated example, of the ends of the separator 13, the end facing the first weak seal portion 31 has a V-shape with its tip (apex) facing the first accommodating section 11 in a plan view. Note that, of the ends of the separator 13, the end facing the first weak seal portion 31 may have a U-shape with its tip facing the first accommodating section 11 to match the shape of the first weak seal portion 31, or may have a zigzag shape.

[0097] The separator 13 may be made of a material that is difficult to bond to the first weak seal layer 62 when heat-sealing the fourth end (opening end) 12d of the connecting member 12 and the second weak seal layer 72. For example, the separator 13 may be made of a resin such as polyethylene terephthalate, or paper.

[0098] Although not shown, the obstructing element may be a heat-sealing resistant layer provided within the connecting member 12. In this case, the heat-sealing resistant layer may be a layer made of a fluorine silicone coating (e.g., KP-911 (product name) manufactured by Shin-Etsu Chemical Co., Ltd.). In this case, a primer layer may be provided between the first weak sealing layer 62 and the heat-sealing resistant layer, if necessary. The heat-sealing resistant layer may also be a layer in which the heat resistance of a portion of the first weak sealing layer 62 has been improved by EB irradiation, for example. That is, the heat-sealing resistant layer may be a portion of the first weak sealing layer 62 that has been crosslinked by EB irradiation. In this case, the portion other than the portion where the heat-sealing resistant layer is to be formed may be covered with a mask during EB irradiation. Even when the obstructing element is a heat-sealing resistant layer, when the fourth end (opening end) 12d of the connecting member 12 and the second weak sealing layer 72 are heat-sealed, the first weak sealing layers 62 can be prevented from being joined to each other on the first storage section 11 side relative to the first weak sealing portion 31.

[0099] <<Second bag>> 19 and 20, in this embodiment as well, the second weak seal layers 72 are joined together in a portion inward of the third end 20c (opening end 25) of the second bag body 20. As a result, a second weak seal portion 32 (joint portion between the second weak seal layers 72) is formed in a portion inward of the third end 20c (opening end 25) of the second bag body 20. In this embodiment, as shown in FIGS. 16 and 19, at least a portion of the second weak seal portion 32 protrudes toward the first storage section 11 in a plan view. In the illustrated example, the second weak seal portion 32 has a V-shape with its tip (apex) facing toward the first storage section 11 in a plan view. However, the second weak seal portion 32 is not limited to this, and may have a U-shape with its tip facing toward the first storage section 11, or a zigzag shape.

[0100] <Bag body> Next, a bag body 1A according to this embodiment will be described with reference to FIGS.

[0101] 21 and 22, in this embodiment as well, a non-weak seal portion (the joint portion between the second weak seal layer 72 and the first strong seal layer 61) 41 is formed at the fourth end 12d of the connecting member 12 of the first bag body 10. Also, as shown in Fig. 21, in this embodiment as well, a third weak seal portion 33 is formed. Furthermore, as shown in Fig. 21 and 22, in this embodiment as well, a fourth weak seal portion 34 is formed.

[0102] In this embodiment, the non-weak seal portion 41 is formed in a position that overlaps the first weak seal portion 31 in a plan view. That is, the non-weak seal portion 41 has a V-shape in a plan view with its tip (apex) facing toward the first accommodating portion 11. However, the non-weak seal portion 41 is not limited to this, and may have a U-shape with its tip facing toward the first accommodating portion 11 to match the shape of the first weak seal portion 31, or may have a zigzag shape.

[0103] 21, the third weak seal portion 33 is formed in a plan view on an extension of the first weak seal portion 31 and the non-weak seal portion 41. In this embodiment, the third weak seal portion 33, the first weak seal portion 31, and the non-weak seal portion 41 as a whole have a V-shape in a plan view with the tip (apex) facing toward the first storage portion 11.

[0104] 21, at least a portion of the fourth weak seal portion 34 (the joint between the fourth end (opening end) 12d of the connecting member 12 and the joint between the second weak seal layers 72) protrudes toward the first accommodating section 11 in a plan view. In the example shown, the fourth weak seal portion 34 has a V-shape with its tip (apex) facing toward the first accommodating section 11. However, the fourth weak seal portion 34 is not limited to this, and may have a U-shape with its tip facing toward the first accommodating section 11, or a zigzag shape.

[0105] As described above, in bag body 1A, a portion of second weak seal portion 32 of bag assembly 1 melts to form fourth weak seal portion 34. Meanwhile, in bag body 1A, second weak seal portion 32 (joint portion between second weak seal layers 72) has a V-shape in plan view with its tip portion (apex) facing toward first storage section 11, similar to the bag assembly 1.

[0106] Next, the operation of the bag body 1A according to the present embodiment having such a configuration will be described. First, a method for manufacturing and using the bag body 1A shown in Fig. 21 will be described with reference to Figs. 23(a)-(e) and 24(a)-(b).

[0107] First, as shown in FIG. 23(a), the first bag body 10 and the second bag body 20 are prepared.

[0108] 23(b), the connecting member 12 is placed inside the second bag body 20. At this time, also in the present embodiment, the connecting member 12 is housed inside the second bag body 20 from the third end 20c (opening end 25) of the second bag body 20 so that the fourth end 12d faces the joint between the second weak seal layers 72 of the second bag body 20.

[0109] 23(c)-(d), the fourth end (opening end) 12d of the connecting member 12 and the second weak seal layer 72 are heat-sealed from the outside of the second bag body 20. At this time, the fourth end 12d of the connecting member 12 and the second weak seal layer 72 are sandwiched from the outside of the second bag body 20 by a seal bar B.

[0110] 23(c), for example, the first end 12a side of the connecting member 12 (the first end 20a side of the second bag body 20) is heat-sealed. At this time, the seal bar B is positioned so that it straddles the first weak seal portion 31 of the first bag body 10 and the second weak seal portion 32 of the second bag body 20 in a plan view.

[0111] In this way, the first bag body 10 and the second bag body 20 are heat-sealed at the first end 12a side of the connecting member 12 (the first end 20a side of the second bag body 20).

[0112] 23(d), the second end 12b side (the second end 20b side of the second bag body 20) of the connecting member 12 is heat-sealed. At this time, the seal bar B is also positioned so that it straddles the first weak seal portion 31 of the first bag body 10 and the second weak seal portion 32 of the second bag body 20 in a plan view.

[0113] In this way, the first bag body 10 and the second bag body 20 are heat-sealed at the second end 12b side (the second end 20b side of the second bag body 20) of the connecting member 12. At this time, the non-weak sealed portion 41, the third weak sealed portion 33, and the fourth weak sealed portion 34 are formed by the sealing bar B, as shown in Figure 23(e).

[0114] In this embodiment, an obstructing element (separator 13) is provided within the connecting member 12. Therefore, in the region where the separator 13 is provided, the first weak seal layers 62 are not joined to each other. As a result, even if the seal bar B protrudes further toward the first housing section 11 than the first weak seal portion 31, as shown in FIGS. 23(c)-(d) above, the first weak seal layers 62 are not joined to each other on the first housing section 11 side than the first weak seal portion 31. Therefore, even when a general linear seal bar is used, the first weak seal portion 31, the fourth weak seal portion 34, and the second weak seal portion 32 of the desired shape can be easily formed. In other words, in this embodiment, the first weak seal portion 31 and the like of the desired shape can be easily formed using a general linear seal bar without using a dedicated seal bar manufactured to match the desired shape.

[0115] When removing the contents from the second bag body 20, the joints between the first weak seal layers 62 (first weak seal portion 31) and the joints between the second weak seal layers 72 (second weak seal portion 32 and fourth weak seal portion 34) are partially peeled off, thereby connecting the first storage section 11 and the second storage section 21 to each other.

[0116] At this time, for example, as shown in Figure 24(a), the user pulls the resin film 70 that constitutes the second bag body 20. At this time, the user pulls the resin film 70 while pinching the vicinity of the third end 20c (opening end 25) of the second bag body 20. This applies a force to the first weak seal portion 31 of the first bag body 10 to open the first weak seal portion 31.

[0117] In this embodiment, at least a portion of each of the first weak seal portion 31, the fourth weak seal portion 34, and the second weak seal portion 32 protrudes toward the first storage section 11 in a plan view. Specifically, the first weak seal portion 31, the fourth weak seal portion 34, and the second weak seal portion 32 each have a V-shape in a plan view with the tip (apex) facing toward the first storage section 11. As a result, when a user pulls the resin film 70, force is first effectively applied to the V-shaped tip of the first weak seal portion 31. Furthermore, when a user pulls the resin film 70, force is also effectively applied to the V-shaped tips of the fourth weak seal portion 34 and the second weak seal portion 32.

[0118] 24(b), the first weak seal portion 31, the fourth weak seal portion 34, and the second weak seal portion 32 are each unsealed. At this time, approximately the center portion in the first direction D1 (near the tip of the V-shape) of each of the first weak seal portion 31, the fourth weak seal portion 34, and the second weak seal portion 32 is partially unsealed. This prevents the third weak seal portion 33 from being unsealed, and maintains the airtightness inside the second bag body 20.

[0119] As described above, according to the present embodiment, in the bag combination 1 of the bag body 1A, at least a portion of the joint between the first weak seal layers 62 (first weak seal portion 31) and the joint between the second weak seal layers 72 (second weak seal portion 32) each protrudes toward the first storage section 11 in a plan view. In addition, in the bag body 1A, at least a portion of the joint between the first weak seal layers 62 (first weak seal portion 31), the joint between the fourth end (opening end) 12d of the connecting member 12 and the joint between the second weak seal layers 72 (fourth weak seal portion 34), and the joint between the second weak seal layers 72 (second weak seal portion 32) each protrudes toward the first storage section 11 in a plan view. This allows the user to effectively apply force to the first weak seal portion 31, the fourth weak seal portion 34, and the second weak seal portion 32 by pulling the resin film 70. Therefore, the joint between the first weak seal layers 62 (first weak seal portion 31) and the joint between the second weak seal layers 72 (second weak seal portion 32 and fourth weak seal portion 34) can be easily peeled off without peeling off the joint (non-weak seal portion 41) between the second weak seal layer 72 and the first strong seal layer 61. As a result, the contents in the second bag body 20 can be easily removed into the first storage section 11 while the sealability inside the second bag body 20 is maintained.

[0120] Furthermore, according to this embodiment, an obstructing element (separator 13) that obstructs bonding of the first weak seal layers 62 is provided on the connecting member 12 closer to the first storage section 11 than the first weak seal portion 31 (the joint portion between the first weak seal layers 62). This makes it possible to easily form the first weak seal portion 31 and the like in a desired shape using a general linear seal bar, without using a dedicated seal bar made to fit the desired shape. [Example]

[0121] Next, the operation of the above-described embodiment will be specifically described.

[0122] Example 1 First, a resin film constituting the connecting member was prepared. A polyethylene film (product name: Suzulon L N-165, manufactured by Aicello Co., Ltd., thickness: 80 μm) was prepared as the first strong sealing layer. A polyethylene film (product name: CF7601ED, ​​manufactured by Toray Advanced Film Co., Ltd., thickness: 30 μm) was prepared as the first weak sealing layer. Furthermore, a nylon film (product name: Bonyl W, manufactured by Kohjin Film & Chemicals Co., Ltd., thickness: 15 μm) was prepared as the second stretched substrate.

[0123] Next, a polyethylene film as the first strong sealing layer, a nylon film as the second stretched substrate, and a polyethylene film as the first weak sealing layer were laminated together by dry lamination to produce a resin film. The layer structure of the resulting resin film is expressed as follows: PEF / ONY / PEF The " / " indicates the boundary between layers. "PEF" means polyethylene film (hereinafter the same). "ONY" means nylon film (hereinafter the same).

[0124] A resin film for forming the second bag was prepared. A polyethylene terephthalate film (manufactured by Toyobo Co., Ltd., product name E5102, thickness 12 μm) was prepared as the third stretched substrate. A polyethylene film (manufactured by Toray Advanced Film Co., Ltd., product name CF7601ED, ​​thickness 30 μm) was prepared as the second weak seal layer.

[0125] Next, a polyethylene terephthalate film as the third stretched substrate and a polyethylene film as the second weak seal layer were bonded to each other by dry lamination to produce a resin film. The layer structure of the obtained resin film is expressed as follows: PET / PEF "PET" means polyethylene film (same below).

[0126] Next, predetermined positions were heat-sealed to form the first, second, third, and fourth weakly sealed sections, as well as the non-weakly sealed section. The first and second weakly sealed sections were heat-sealed under the following conditions: Heat sealer: Tester Sangyosha Co., Ltd., TP-701A Sealing temperature: 160℃ Sealing pressure: 1MPa Sealing time: 1 second Seal width: 10mm

[0127] The third weakly sealed portion, the fourth weakly sealed portion, and the non-weakly sealed portion were heat-sealed under the following conditions. Impulse sealer: Fuji Impulse Co., Ltd., CV-300-10W Sealing temperature: 190℃ Sealing time: 1.8 seconds Cooling temperature: 80℃ Seal width: 10mm In addition, the first weak seal portion, the fourth weak seal portion, and the second weak seal portion each had a rectangular shape extending along the first direction in plan view (see FIG. 9). In addition, no obstructing element was provided inside the connecting member.

[0128] Example 2 Each seal portion was formed in the same manner as in Example 1, except that a polyethylene film (manufactured by Okamoto Corporation, TP9 (product name), thickness 35 μm) was used as the first weak seal layer and the second weak seal layer.

[0129] Example 3 Each seal portion was formed in the same manner as in Example 1, except that a polyethylene film (manufactured by Okamoto Corporation, product name TPF4, thickness 30 μm) was used as the first weak seal layer and the second weak seal layer.

[0130] Example 4 Each seal portion was formed in the same manner as in Example 1, except that a polyethylene film (product name CF7601EB, manufactured by Toray Film Processing Co., Ltd., thickness 30 μm) was used as the first weak seal layer and the second weak seal layer.

[0131] Example 5 Each seal portion was formed in the same manner as in Example 1, except that a polyethylene film (manufactured by Okamoto Corporation, product name TP9, thickness 35 μm) was used as the second weak seal layer.

[0132] Example 6 Each sealed portion was formed in the same manner as in Example 1, except that the second stretched substrate was not provided. In Example 6, the layer structure of the resin film that constitutes the connecting member is expressed as follows. PEF / PEF

[0133] Example 7 Each seal portion was formed in the same manner as in Example 1, except that the first weak seal portion, the fourth weak seal portion, and the second weak seal portion each had a V-shape in plan view with their tip (apex) facing toward the first storage portion (see Figure 21), and a separator (polyethylene terephthalate film (manufactured by Unitika Ltd., Emblet PTHZ (product name), thickness 12 μm)) was provided within the connecting member as an obstructing element.

[0134] Example 8 Each seal portion was formed in the same manner as in Example 1, except that a polyethylene film (manufactured by Okamoto Corporation, product name TP9, thickness 35 μm) was used as the first weak seal layer and the second weak seal layer, the first weak seal portion, the fourth weak seal portion and the second weak seal portion each had a V-shape in plan view with their tip (apex) facing toward the first storage portion (see Figure 21), and a separator (polyethylene terephthalate film (manufactured by Unitika Ltd., product name Emblet PTHZ, thickness 12 μm)) was provided within the connecting member as an obstruction element.

[0135] Example 9 Each seal portion was formed in the same manner as in Example 1, except that a polyethylene film (manufactured by Okamoto Corporation, product name TPF4, thickness 30 μm) was used as the first weak seal layer and the second weak seal layer, and the first weak seal portion, the fourth weak seal portion and the second weak seal portion each had a V-shape with the tip (apex) facing toward the first storage portion when viewed in a plane (see Figure 21).

[0136] (Comparative Example 1) Each seal portion was formed in the same manner as in Example 1, except that polyethylene (Novatec (registered trademark), LC602A (product name), thickness 30 μm, manufactured by Japan Polyethylene Co., Ltd.) was used as the first strong seal layer, first weak seal layer, and second weak seal layer.

[0137] (Comparative Example 2) Each seal portion was formed in the same manner as in Example 1, except that a polyethylene film (manufactured by Toray Advanced Film Co., Ltd., product name CF7601ED, ​​thickness 30 μm) was used as the first strong seal layer, and a polyethylene film (manufactured by Toray Advanced Film Co., Ltd., product name CF7601EB, thickness 30 μm) was used as the first weak seal layer.

[0138] (Comparative Example 3) Each seal portion was formed in the same manner as in Example 1, except that a polyethylene film (product name CF7601ED, ​​manufactured by Toray Advanced Film Co., Ltd., thickness 30 μm) was used as the first strong seal layer.

[0139] <Seal strength measurement> Next, the seal strength was measured for each of the sealed portions of Example 1 to Comparative Example 3. The seal strength was measured under the following conditions. Tensile testing machine: Strograph VG1F, manufactured by Toyo Seiki Seisakusho Co., Ltd. Tensile speed: 300 mm / min Chuck distance: 25mm Test piece width: 15 mm Peeling conditions: T-shaped peeling

[0140] <Openability test> Next, the connection member and the second bag body were connected to each other using the method shown in Figures 12(a)-(b) or 24(a)-(b), and the openability of the second bag body was confirmed.

[0141] The results are shown in Table 1. In the "Seal strength" and "Seal strength ratio" columns in Table 1, "(1)" means the seal strength of the first weak seal portion, "(2)" means the seal strength of the second weak seal portion, and "(3)" means the seal strength of the non-weak seal portion.

[0142] The evaluation criteria for the "Ease of opening" column in Table 1 are as follows: S: The second bag was able to be opened very easily while maintaining its airtightness. A: The second bag was easily opened while maintaining its airtightness. B: The second bag was opened while maintaining its airtightness. C: It was difficult to open, but the second bag was able to be opened while maintaining the airtightness inside the second bag. D. The second bag could not be opened, or the non-weak sealed portion was opened, so the airtightness inside the second bag could not be maintained.

[0143] [Table 1]

[0144] As a result, as shown in Table 1, in Comparative Examples 1 to 3, the second bag could not be opened, or the non-weak seal portion was opened, and the airtightness inside the second bag could not be maintained. In contrast, in Examples 1 to 9, the second bag could be opened while the airtightness inside the second bag was maintained. As such, it was found that according to this embodiment, the contents inside the second bag could be removed into the first storage section while the airtightness inside the second bag was maintained.

[0145] It is also possible to combine the multiple components disclosed in each of the above embodiments as needed, or to delete some of the components disclosed in each of the above embodiments. [Explanation of symbols]

[0146] 1 bag assembly 1A bag body 10 First bag body 11 First storage section 12 Connecting member 12d 4th end 13 Separator 20 Second bag body 21 Second storage section 25 Open End 52 Second strong sealing layer 61 First strong sealing layer 62 First weak seal layer 72 Second weak seal layer

Claims

1. a first bag body having a first storage portion and a connecting member connected to the first storage portion; a second bag body having a second storage portion and an open end connectable to the connecting member; a first weak seal layer is formed on an inner surface of the connection member, the first weak sealing layers are bonded to each other, a first strong sealing layer is formed on an outer surface of the connection member, a second weak seal layer is formed on the inner surface of the second bag; The bag assembly, wherein the second weak seal layers are joined to each other at a portion inside the open end of the second bag body.

2. The bag assembly according to claim 1 , wherein at least a portion of the joint between the first weak sealing layers and the joint between the second weak sealing layers protrudes toward the first storage section in a plan view.

3. The bag assembly according to claim 2 , wherein the connecting member is provided with an obstructing element that obstructs the joining of the first weak sealing layers on the first storage section side relative to the joint between the first weak sealing layers.

4. A bag assembly according to claim 1, With the connecting member housed inside the second bag body, the second weak sealing layer and the first strong sealing layer are joined to each other, The bag body, wherein an open end of the connecting member and a joint portion between the second weak seal layers are joined to each other.

5. a second strong sealing layer is formed on the inner surface of the first storage portion, The bag according to claim 4 , wherein the second strong sealing layer and the first strong sealing layer are joined to each other.

6. 5. The bag body according to claim 4, wherein the joints between the first weak sealing layers and the joints between the second weak sealing layers are each partially peeled off, and the first storage section and the second storage section are connected to each other.

7. The bag body according to claim 4 , wherein the seal strength of the joint between the first weak sealing layers is 0.15 times or more and less than 1 time the seal strength of the joint between the second weak sealing layer and the first strong sealing layer.

8. The bag body according to claim 4 , wherein the seal strength of the joint between the second weak sealing layers is 0.15 times or more and less than 1 time the seal strength of the joint between the second weak sealing layer and the first strong sealing layer.

9. The bag body according to claim 4, wherein at least a portion of the joints between the first weak sealing layers, the joints between the opening ends of the connecting member and the joints between the second weak sealing layers, and the joints between the second weak sealing layers each protrude toward the first storage section when viewed in a plane.

10. The bag body according to claim 9 , wherein the connecting member is provided with an obstructing element that obstructs bonding of the first weak sealing layers on the first storage section side relative to the joint between the first weak sealing layers.

11. A method for manufacturing a bag using the bag combination according to claim 1, placing the connecting member inside the second bag; and heat-sealing the open end of the connecting member and the second weak seal layer from the outside of the second bag body.

12. 12. The method for manufacturing a bag body according to claim 11, wherein at least a portion of the joints between the first weak sealing layers, the joints between the opening ends of the connecting member and the joints between the second weak sealing layers, and the joints between the second weak sealing layers each protrude toward the first storage section when viewed in a plane.

13. The method for manufacturing a bag body according to claim 12, wherein an obstructing element that obstructs joining of the first weak sealing layers is provided on the connecting member closer to the first storage section than the joint between the first weak sealing layers.

14. 14. The method for manufacturing a bag body according to claim 11, further comprising a step of partially peeling off the joint between the first weak sealing layers and the joint between the second weak sealing layers to connect the first storage section and the second storage section to each other.

Images