JP7368347B2 - Spout joint structure and double bag - Google Patents

Description

The present invention relates to a spout joint structure and a double bag.
This application claims priority based on Japanese Patent Application No. 2018-36845 filed in Japan on March 1, 2018, the contents of which are incorporated herein.

A package is known in which a double-layered bag consisting of an inner bag for containing contents and an outer bag for containing the inner bag is equipped with a spout for communicating the inside of the inner bag with the outside of the outer bag. (For example, Patent Documents 1 and 2).
As a structure for joining the spout to the inner bag and the outer bag, a structure in which the inner bag film and the outer bag film are laminated, overlapped and joined on the same flange formed on the spout (for example, Patent Document 3 ) and a structure in which one inner bag film and one outer bag film are joined to two flanges formed on the spout (for example, Patent Document 4) are known.

Japanese Patent Application Publication No. 2005-112363 International Publication No. 2016/039248 Utility Model Publication No. 04-041848 Utility Model Publication No. 03-114738

As described in Patent Document 3, when two films are overlapped on the same flange, the outer bag film is bonded to the inner bag film, so the bonding of the film to the flange may not be sufficient or the outer bag film may There is a risk that the bag and inner bag may separate from the flange together. As described in Patent Document 4, when separate flanges are formed for each film, the structure of the spout becomes complicated and the package becomes bulky at the spout joint.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a spout joint structure and a double bag capable of firmly joining a flange to an inner bag and an outer bag.

In order to solve the above problems, the present invention provides a packaging bag that includes an inner bag having a content storage section and an outer bag that accommodates the inner bag, in which a spout member is joined to the inner bag and the outer bag. In the spout joint structure, the spout member includes a cylindrical portion for communicating the content storage portion with the outside of the outer bag, and a cylindrical portion that communicates with the inner bag and the outer bag at an outer periphery of the cylindrical portion. and a flange portion to be joined, and the innermost layer of the film constituting the outer bag is joined to the same flange portion in a region different from the region to which the inner bag is joined. Provide structure.

The flange portion may have a region where the inner bag is joined and a region where the outer bag is joined on the same joint surface.
The inner bag may have a spout insertion hole into which the cylindrical portion is inserted, and the innermost layer of the film constituting the outer bag may be joined to the flange portion through the spout insertion hole.
The outer bag may have a spout insertion hole into which the cylindrical portion is inserted, and the spout insertion hole of the inner bag may be larger than the spout insertion hole of the outer bag.
The connection between the inner bag and the spout member may be continuously sealed over the entire circumference of the spout member.

The present invention also provides a double bag comprising an inner bag having a contents storage portion and an outer bag housing the inner bag, and having the spout joint structure described above.

According to the present invention, since the inner bag and the outer bag are sealed to the same flange portion, the flange portion can be firmly joined to the inner bag and the outer bag without complicating the structure of the spout.

FIG. 3 is a cross-sectional view showing the spout joint structure of the first embodiment. FIG. 1 is a perspective view showing an example of a packaging bag having a spout joint structure according to the first embodiment. It is a perspective view showing the spout joint structure of a 2nd embodiment. FIG. 7 is a cross-sectional view showing a spout joint structure according to a second embodiment.

Hereinafter, the present invention will be described based on preferred embodiments and with reference to the drawings.
FIG. 1 shows the spout joint structure of the first embodiment. Further, FIG. 2 shows an example of a packaging bag having this spout joint structure.
The main body portion 31 of the packaging bag 30 of this embodiment includes an inner bag 20 having a content storage portion and an outer bag 10 that accommodates the inner bag 20. The packaging bag 30 of this embodiment has a spout member 32 for communicating the inside of the inner bag 20 and the outside of the outer bag 10.

The capacity of the inner bag 20 may be, for example, less than 1 liter or about several liters, and it is also possible to apply it to a large container of several tens of liters or more. The contents are preferably fluids such as liquids, powders, and granules. Specific examples of contents include beverages, seasonings, concentrated liquids, food additives, fragrances, foods and raw materials such as oils and fats, detergents, photographic developers, liquid fertilizers, adhesives, water-based paints, and liquids. Examples include resins, battery fluids, developing solutions, various industrial chemicals, and non-food products including pharmaceuticals. Further, if the contents themselves have fluidity, it is also possible to apply the present invention to a mixture in which a solid substance such as a linear or small piece is dispersed in a fluid such as a liquid or a powder or granule. When the solid material has flexible deformability, such as seaweed, it is less likely to clog when passing through the spout member 32, so fluidity can be ensured by mixing it with the liquid.

The films 11 and 21 constituting the outer bag 10 and the inner bag 20 may be composed of, for example, a resin film or a laminated film containing a resin layer. The resin film may be a single layer film consisting of one resin layer, or a multilayer film including two or more multilayers. Hereinafter, the film 11 forming the outer bag 10 may be referred to as the "outer bag film 11", and the film 21 forming the inner bag 20 may be referred to as the "inner bag film 21". Further, the outer bag film 11 and the inner bag film 21 may be collectively referred to simply as "films 11, 21."

As the single layer film that can constitute the films 11 and 21, a film made of a sealant resin such as a thermoplastic resin is used. The multilayer films that can constitute the films 11 and 21 include a sealant layer made of thermoplastic resin, etc., and a base material layer made of polyester resin such as polyethylene terephthalate (PET), polyamide resin such as nylon (Ny), polypropylene (PP), etc. ), ethylene-vinyl alcohol copolymer (EVOH), or the like is used. Examples of the thermoplastic resin constituting the sealant layer include polyethylene (PE), unstretched polypropylene (PP), cyclic polyolefin (COP and COC), polyester, and modified resins thereof.
As the thermoplastic resin constituting the sealant layer and the resin constituting the base material layer, resins using plant-derived raw materials obtained from biomass can also be used.

The base material layer has a gas barrier layer for blocking gases such as oxygen and water vapor, for example, a vapor-deposited layer of metal such as aluminum, a vapor-deposited layer of an inorganic compound such as silicon oxide or aluminum oxide, a vapor-deposited layer of an inorganic compound such as EVOH or vinylidene chloride (PVDC), etc. It is also possible to laminate one or more of gas barrier resin layers, metal foils such as aluminum foils, kraft paper, etc. in combination. Examples of methods for laminating the sealant layer and the base material layer include dry lamination, extrusion lamination, coextrusion, and the like. An adhesive layer, an anchor layer, etc. made of an adhesive or adhesive resin may be provided between the sealant layer and the resin layer in order to bond them together. In a composite film including a resin layer and a layer of a material other than resin, examples of the material other than resin include metal, paper, rubber, nonwoven fabric, and the like.

The spout member 32 has a cylindrical portion 33 for communicating the contents storage portion with the outside of the outer bag, and a flange portion 34 joined to the outer bag 10 and the inner bag 20. One flange portion 34 is formed on the outer periphery of the cylindrical portion 33 . In order to open and close the spout member 32, the spout member 32 may be provided with a cap, a cock, etc. A component such as a tube or a communication pipe may be connected to the cylindrical portion 33 toward the outside or inside of the inner bag 20.

The films 11 and 21 each have spout insertion holes 12 and 22 into which the cylindrical portion 33 is inserted. The spout insertion hole 22 of the inner bag 20 is formed larger than the spout insertion hole 12 of the outer bag 10. Thereby, the inner surface of the outer bag film 11 can be joined to the flange portion 34 of the spout member 32 through the spout insertion hole 22 of the inner bag 20.

Materials for forming the spout member 32 include polyester such as polyethylene (PE), polypropylene (PP), ethylene-vinyl acetate copolymer (EVA), polyethylene terephthalate (PET), polyamide such as nylon, and adhesive polyolefin. , cyclic polyolefins, thermoplastics such as polybutylene, and the like. It is preferable that the entire spout member 32 or at least the region to be joined to the outer bag 10 or the inner bag 20 is provided with a material that can be joined, such as a sealant.
As resins for thermoplastic plastics and sealants, resins using plant-derived raw materials obtained from biomass can also be used.

The spout joint structure of this embodiment has a region 13 where the flange portion 34 is joined to the outer bag film 11 and a region 23 where the flange portion 34 is joined to the inner bag film 21. In the example shown in FIG. 1, the outer surface of the flange portion 34 is joined to the inner surfaces of the films 11 and 21 by sealing. The films 11 and 21 may have sealant layers 11s and 21s only on at least the inner surfaces, respectively.

In the case of this embodiment, the outer bag joining region 13 is an area where the sealant layer 11s of the outer bag film 11 is joined to the flange portion 34. Further, the inner bag joining region 23 is an area where the sealant layer 21s of the inner bag film 21 is joined to the flange portion 34. The outer bag joining area 13 is provided in a different area from the inner bag joining area 23 on the flange portion 34 . Thereby, the outer bag 10 and the inner bag 20 can be directly joined to one flange portion 34. Therefore, the flange portion 34 can be firmly joined to the outer bag 10 and the inner bag 20 without complicating the structure of the spout member 32.

In the case of this embodiment, the flange portion 34 has a surface substantially perpendicular to the length direction of the cylindrical portion 33 as a bonding surface 34a to the films 11 and 21. Thereby, even if the surfaces of the films 11, 21 are substantially perpendicular to the length direction of the cylindrical portion 33, the inner surfaces of the films 11, 21 can be easily joined to the flange portion 34. The joint surface 34a in the illustrated example is the outer surface 34a on the tip 33a side of the cylindrical portion 33 among both surfaces 34a and 34b of the flange portion 34 in the length direction of the cylindrical portion 33. The cylindrical portion 33 may extend toward the inner surface 34b of the flange portion 34, which is the opposite side from the tip portion 33a.

Since the outer bag joining area 13 and the inner bag joining area 23 are provided on the same joining surface 34a of the flange portion 34, even if there is a gap between the outer bag film 11 and the inner bag film 21, The films 11 and 21 are overlapped substantially in parallel, and bulkiness can be suppressed.
Note that the joining surface 34a may have a step or an inclination so that the outer bag joining region 13 is closer to the distal end portion 33a of the cylindrical portion 33 than the inner bag joining region 23 in the length direction of the cylindrical portion 33. It is preferable that a part of the flange portion 34 not be interposed between the outer bag film 11 joined to the outer bag joining region 13 and the inner bag film 21 joined to the inner bag joining region 23.

The inner bag 20 has a spout insertion hole 22 into which the cylindrical part 33 is inserted, and the innermost layer of the outer bag film 11 is joined to the flange part 34 through this spout insertion hole 22. The outer bag film 11 can be joined to the flange portion 34 without joining the inner surface to the outer surface of the inner bag film 21.

If the outer bag 10 has a spout insertion hole 12 into which the cylindrical part 33 is inserted, and the spout insertion hole 22 of the inner bag 20 is formed larger than the spout insertion hole 12 of the outer bag 10, Any part of the peripheral edge of the spout insertion hole 12 can be joined to the flange part 34.

The connection between the inner bag 20 and the spout member 32 is preferably sealed continuously over the entire circumference of the spout member 32 in order to prevent leakage of the contents. On the other hand, the outer bag 10 and the spout member 32 may be joined to each other over the entire circumference of the spout member 32 or to a part of the circumference.

Although not particularly illustrated, when the outer surface of the inner bag film 21 can be joined to the inner surface 34b of the flange portion 34, the outer surface of the inner bag film 21 is joined to the inner surface 34b of the flange portion 34, and the outer surface of the inner bag film 21 is joined to the inner surface 34b of the flange portion 34, and the outer surface of the inner bag film 21 is The inner surface of the bag film 11 may be joined. When the outer bag 10 and the inner bag 20 are respectively joined to opposite surfaces of the flange portion 34, the size relationship of the spout insertion holes 12 and 22 is not particularly limited.

Next, the spout joint structure of the second embodiment will be described with reference to FIGS. 3 and 4. The packaging bag 40 of this embodiment includes an inner bag 20 having a content storage section, an outer bag 10 that accommodates the inner bag 20, and a spout member for communicating the inside of the inner bag 20 and the outside of the outer bag 10. 42, it is common to the spout joint structure of the first embodiment. The spout member 42 has two stages of flange parts 44 and 45, of which the flange part 45 of the spout member 42 is sandwiched and joined between the films 11 and 21, unlike the spout joint structure of the first embodiment. It is different from

In this case, the shape of the flange parts 44 and 45 in a plane perpendicular to the cylindrical part 43 is an ellipse having a short axis in the direction in which the two films 11 and 21 face each other (the left-right direction in FIG. 4). Preferably, both ends of the ellipse in the major axis direction may be tapered into a V-shape.
The flange portion 44 on the tip side of the spout member 42 is provided between the ends 11a, 21a of the films 11, 21 and the tip portion 43a of the cylindrical portion 43. This flange portion 44 is not involved in joining the spout member 42 and the films 11, 21.

The flange part 45 of the spout member 42 is sandwiched between the innermost sealant layers 21s of the two inner bag films 21 facing each other, and the flange part 45 is placed on the joint surface 45a which is the outer surface of the flange part 45. It is sealed. Further, the sealant layer 11s of the outer bag film 11 is joined to the flange part 45 in a region where the joint surface 45a of the flange part 45 is not covered with the inner bag film 21.

Since the outer bag joining area 13 and the inner bag joining area 23 are provided on the same joining surface 45a of the flange portion 45, even if there is a gap between the outer bag film 11 and the inner bag film 21, The films 11 and 21 are overlapped substantially in parallel, and bulkiness can be suppressed. Note that the joining surface 45a may have a step or an inclination so that the outer bag joining region 13 is located outside the inner bag joining region 23 in the radial direction of the cylindrical portion 33. It is preferable that a part of the flange portion 45 not be interposed between the outer bag film 11 joined to the outer bag joining area 13 and the inner bag film 21 joined to the inner bag joining area 23.

Since the end 11a of the outer bag film 11 is located closer to the tip 43a of the cylindrical part 43 than the end 21a of the inner bag film 21, any location near the end 11a of the outer bag film 11 can be joined to the flange portion 45.

The connection between the inner bag 20 and the spout member 42 is preferably sealed continuously over the entire circumference of the spout member 42 in order to prevent leakage of the contents. On the other hand, the outer bag 10 and the spout member 42 may be joined to each other over the entire circumference of the spout member 42 or to a part of the circumference.

The spout joint structures of the first and second embodiments can be used for packaging bags such as double bags. When pouring out the contents from the packaging bags 30, 40 having the spout joint structure of the above embodiment, the contents may be poured out through the spout members 32, 42. When filling the packaging bags 30, 40 with contents, the contents may be injected through the spout members 32, 42. A filling spout member may be provided separately from the pouring spout member. Instead of providing a spout member for filling, some sealed portions around the outer bag 10 and inner bag 20 were left unsealed before filling the contents, and the contents were filled through the unsealed portions. After that, the unsealed portion may be closed with a seal. The contents injected from the spout members 32, 42 may be transferred to the inside of the outer bag 10 outside the inner bag 20 through a valve or filter provided in the inner bag 20 separately from the spout members 32, 42.

Although the present invention has been described above based on the preferred embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.
When the packaging bag is a triple bag or more, the spout member may be joined so that at least two of the plurality of bags constituting the multiple bag become the above-mentioned outer bag and inner bag.

When the spout joint structure of the first embodiment is applied to multiple bags of three or more layers, each of the plurality of bags constituting the multiple bag has a spout insertion hole into which the cylindrical part of the spout member is inserted, and the inner bag body The spout insertion hole may be formed larger than the spout insertion hole of the outer bag. In this case, the periphery of the spout insertion hole in the outer bag may be sealed to the joint surface of the flange part inside the area where the periphery of the spout insertion hole in the inner bag body is sealed to the joint surface of the flange part. can.

When the spout joint structure of the second embodiment is applied to multiple bags of three or more layers, the ends of each film constituting the plurality of bags are arranged at positions closer to the tip of the cylindrical part as the outer bags become closer. may be done. In this case, the end of the film that makes up the outer bag is attached to the flange on the side closer to the tip of the cylinder than the area where the end of the film that makes up the inner bag is sealed to the joint surface of the flange. Can be sealed to the joint surface.

According to the present invention, since the inner bag and the outer bag are sealed to the same flange part, the flange part can be firmly joined to the inner bag and the outer bag without complicating the structure of the spout. , industrial applications are possible.

DESCRIPTION OF SYMBOLS 10... Outer bag, 11... Outer bag film, 12... Spout insertion hole of outer bag, 13... Outer bag joining area, 20... Inner bag, 21... Inner bag film, 22... Spout insertion hole of inner bag, 23... Inside Bag joining area, 30, 40... Packaging bag, 31... Main body part, 32, 42... Spout member, 33, 43... Cylinder part, 34, 44, 45... Flange part.

Claims (6)

In a packaging bag comprising an inner bag having a contents storage portion and an outer bag housing the inner bag, a spout joining structure for joining a spout member to the inner bag and the outer bag,
The film constituting the inner bag has a sealant layer only on the inner surface,
The film constituting the outer bag has a sealant layer only on the inner surface,
The spout member has a cylindrical portion for communicating the contents storage portion with the outside of the outer bag, and a flange portion joined to the inner bag and the outer bag at an outer peripheral portion of the cylindrical portion. , the sealant layer of the innermost layer of the film constituting the outer bag is bonded to the same flange portion in a region different from the region to which the sealant layer of the film constituting the inner bag is bonded. , spout joint structure. The spout joint structure according to claim 1, wherein the flange portion has a region where the inner bag is joined and a region where the outer bag is joined on the same joint surface. 3. The inner bag has a spout insertion hole into which the cylindrical part is inserted, and the innermost layer of the film constituting the outer bag is joined to the flange part through the spout insertion hole. The spout joint structure described in . The spout joint according to claim 3, wherein the outer bag has a spout insertion hole into which the cylindrical part is inserted, and the spout insertion hole of the inner bag is formed larger than the spout insertion hole of the outer bag. structure. The spout joint structure according to any one of claims 1 to 4, wherein the joint between the inner bag and the spout member is continuously sealed over the entire circumference of the spout member. A double bag comprising an inner bag having a contents storage portion and an outer bag accommodating the inner bag, the double bag having the spout joint structure according to any one of claims 1 to 5.

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