JP7208910B2 - self-supporting packaging bag - Google Patents

Description

The present invention relates to a self-supporting packaging bag. This application claims priority based on Japanese Patent Application No. 2017-188858 filed in Japan on September 28, 2017, the contents of which are incorporated herein.

Conventionally, rigid containers such as glass bottles and plastic bottles, as well as bag-in-boxes that house a flexible inner bag in a rigid outer bag, have been used as containers that can be consumed little by little rather than all at once. there is In recent years, from the viewpoint of facilitating waste disposal, there has been a demand for self-supporting packaging bags made of synthetic resin film that can be folded after use and easily reduced in volume.

A bag-in-box is a composite container in which a box (box container) such as a paper carton or corrugated cardboard is used as an outer container, and a plastic bag (bag container) is used as an inner bag. For this reason, it is necessary to separately prepare and combine the inner bag and the outer container at the time of manufacture, and at the time of disposal, it is necessary to dispose of them separately for each material, and an improvement is desired.

Patent Document 1 describes a double self-supporting bag in which a member folded in half is inserted downward into the upper portion of a self-supporting bag having a bottom gusset portion at the bottom, and the side portions and upper portion are sealed with the front and back films of the main body. . However, when the flexible bag container is opened so as to take out the contents, the inner space collapses and the self-standing cannot be maintained.

In Patent Document 2, a resealable mouth plug is attached to the inner bag, a sealed space in which fluid is sealed is formed between the inner bag and the outer bag, and a side seal portion of the outer bag covers the bent portion. A self-supporting pouch is described that is folded back through the outer bag and retains the three-dimensional shape of the outer bag by the fluid pressure enclosed in the sealed space. However, when manufacturing containers, it is difficult to adjust the amount of gas enclosed in the sealed space. I have a bad problem.

Patent Literature 3 describes a flexible packaging container in which vertical ribs are formed at corner portions along the vertical direction and hollow portions are formed in the vertical ribs. However, since the straw-shaped vertical ribs are sealed on the sides, the manufacturing process of the container becomes complicated, and the vertical ribs must be separated and removed when disposing of the container.

JP 2010-275018 A JP-A-2015-6891 JP-A-2000-142720

The present invention has been made in view of the above circumstances, and does not have a complicated structure. An object of the present invention is to provide a self-supporting packaging bag.

In order to solve the above-mentioned problems, the present invention comprises an inner bag filled with contents and an exterior for housing the inner bag, the exterior having a main surface portion provided on at least one of the front and rear sides of the inner bag. wherein the exterior or the inner bag has a bottom gusset and is self-supporting, and the inner bag is joined to the main surface of the exterior at a side end with respect to the space filled with the content, Further, there is provided a self-supporting packaging bag characterized by having a non-joint portion at least on the upper end portion of the main surface portion of the exterior.

The exterior includes a pair of main surface portions on both front and rear sides of the inner bag, and the bottom gusset portion joined between the pair of main surface portions at a lower portion of the main surface portion, and is self-supporting. good too.

The inner bag may have a bottom gusset portion.

A top end seal portion may be formed on the top end portion of the exterior, and the top end portion of the inner bag may be positioned lower than the top end seal portion of the exterior.

The exterior may be joined at its periphery to seal the inner bag, and may have an air inlet hole in the exterior.

In the region where the inner bag is joined to the main surface of the exterior at the side end, the inner surface of the main surface of the exterior is joined to the outer surface of the inner bag, or the inner bag is connected through a recess penetrating the inner bag. The main surface portions of the exterior may be joined together.

The inner bag may have a spout member capable of spouting the contents outside the exterior.

In the region where the spout member is joined to the inner bag, the inner surface of the main surface portion of the exterior is joined to the outer surface of the inner bag, or the main surface portion of the exterior is connected to the main surface portion through a recess penetrating the inner bag. It may be joined with the spout member.

The exterior may be composed of a laminated film including a resin layer and a paper layer.

ADVANTAGE OF THE INVENTION According to this invention, it does not have a complicated structure, and even if the fluid contents are consumed little by little and the contents decrease and the inner bag is deflated, the outer packaging is not easily deflated, and stable self-standing is maintained. A self-supporting packaging bag can be provided.

It is a front view of the self-supporting packaging bag of 1st Embodiment. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1; FIG. 2 is a cross-sectional view taken along the line BB of FIG. 1; It is a front view of the exterior of 1st Embodiment. It is a front view of the inner bag of 1st Embodiment. FIG. 4 is a partially enlarged cross-sectional view showing an example of a joint portion between an exterior and an inner bag; FIG. 4 is a partially enlarged cross-sectional view showing an example of a non-joint portion between the exterior and the inner bag; 1 is a perspective view of a self-supporting packaging bag of a first embodiment; FIG. FIG. 4 is a partially enlarged cross-sectional view showing an example of a joining structure of spout members; FIG. 11 is a partially enlarged cross-sectional view showing another example of the joining structure of the spout member; Fig. 10 is a front view of the self-supporting packaging bag of the second embodiment; Fig. 10 is a vertical cross-sectional view of a self-supporting packaging bag of a third embodiment; FIG. 11 is a vertical cross-sectional view of a self-supporting packaging bag of a fourth embodiment;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.

FIG. 1 shows a front view of the self-supporting packaging bag of the first embodiment. 2A is a cross-sectional view taken along line AA of FIG. 1. FIG. 2B is a longitudinal sectional view taken along line BB in FIG. 1. FIG. FIG. 3 shows a front view of the exterior of this embodiment. Moreover, in FIG. 4, the front view of the inner bag of this embodiment is shown.

A self-supporting packaging bag 30 of the first embodiment includes an inner bag 20 filled with contents, and an exterior 10 that houses the inner bag 20 . In FIG. 2A, the left-right direction of the self-supporting packaging bag 30 is the same as the left-right direction of the paper, and the front-rear direction of the self-supporting packaging bag 30 is the up-down direction of the paper. In FIG. 2B, the up-down direction of the self-supporting packaging bag 30 is the same as the up-down direction of the paper surface, and the front-rear direction of the self-supporting packaging bag 30 is the left-right direction of the paper surface.

As shown in FIGS. 2A, 2B, and 3, the exterior 10 includes gusset portions 12 and 13 provided on both upper and lower sides, respectively, and main surface portions 11 and 11 which overlap front and rear through the gusset portions 12 and 13. have The main surface portions 11 , 11 of the exterior 10 form a pair on both front and rear sides and constitute the outer shape of the exterior 10 .

As shown in FIGS. 2A, 2B, and 4, the inner bag 20 includes gusset portions 22 and 23 provided on both upper and lower sides, respectively, and main surface portions 21 and 21 which are overlapped in the front-rear direction via the gusset portions 22 and 23. 21. The main surface portions 21 , 21 of the inner bag 20 form a pair on both front and rear sides and constitute the outer shape of the inner bag 20 .

The gusset portions 12, 13, 22, 23 of the exterior 10 and the inner bag 20 are each folded in two along folding lines 12a, 13a, 22a, 23a that are mountain-folded inward and valley-folded outward. . In the following description, the lower gusset portions of the exterior 10 and the inner bag 20 may be referred to as bottom gusset portions 12 and 22, and the upper gusset portions as upper gusset portions 13 and 23, respectively. A gusset may also be called a gusset, a gusset, or the like. The direction in which the bottom gusset portions 12, 22 are opened and closed about the folding lines 12a, 22a is the front-rear direction.

The bottom gusset portions 12, 22 and the upper gusset portions 13, 23 do not overlap each other when the exterior 10 or the inner bag 20 is flat. That is, the folding lines 12a, 22a of the bottom gusset portions 12, 22 and the folding lines 13a, 23a of the upper gusset portions 13, 23 are separated in the vertical direction. The bottom gusset portion 12 of the exterior 10 is provided below the bottom gusset portion 22 of the inner bag 20 . Also, the upper gusset portion 13 of the exterior 10 is provided above the upper gusset portion 23 of the inner bag 20 .

At the side ends of the exterior 10 and the inner bag 20, as shown in FIG. 2A, the respective main surface portions 11 and 21 are joined to the main surface portions 11 and 21 facing each other in the front and rear by sealing to form a side end seal portion 11a. , 21a are formed. In a region between the left side end seal portions 11a and 21a and the right side end seal portions 11a and 21a, the main surface portion 11 of the exterior 10 and the main surface portion 21 of the inner bag 20 which are adjacent to each other in the front and rear are not separated. It is joined. Here, the side edge is an edge in the left-right direction that intersects the up-down direction and the front-rear direction.

As shown in FIG. 2B, at the lower end of the exterior 10 or the inner bag 20, the inner surfaces of the main surface portions 11 and 21 and the inner surfaces of the bottom gusset portions 12 and 22 face each other and are joined by sealing, and the lower end sealing portion 12b , 22b are formed. Similarly, at the upper end portion of the exterior 10 or the inner bag 20, the inner surfaces of the main surface portions 11 and 21 and the inner surfaces of the upper gusset portions 13 and 23 are opposed and joined by sealing, and the upper end seal portions 13b and 23b are joined. formed. Here, the inner surfaces of the gusset portions 12 , 13 , 22 , 23 are the inner surfaces of the exterior 10 or the inner bag 20 .

In the following description, the lower end seal portions 12b, 22b and the upper end seal portions 13b, 23b of the exterior 10 or the inner bag 20 may be collectively referred to as upper and lower end seal portions 12b, 13b, 22b, 23b.

The gusset portions 12, 22, 13, 23 of the exterior 10 and the inner bag 20 have two upper and lower end seal portions 12b, 13b, 22b, 23b before and after the folding lines 12a, 13a, 22a, 23a, respectively. In the illustrated example, the upper and lower end seal portions 22b and 23b on the front side of the inner bag 20 are directed toward the upper and lower end seal portions 12b and 13b on the front side of the exterior 10, and are positioned between the main surface portion 11 on the front side and the gusset portions 12 and 13. is inserted in Similarly, the upper and lower end seal portions 22b and 23b on the rear side of the inner bag 20 are directed toward the upper and lower end seal portions 12b and 13b on the rear side of the exterior 10, and the main surface portion 11 on the rear side and the gusset portions 12 and 13 are separated from each other. inserted in between.
The upper and lower end seal portions 22b and 23b on both the front and rear sides of the inner bag 20 may be shifted to either the front side or the rear side of the exterior 10 only. In that case, both the top and bottom end seal portions 22b and 23b of the inner bag 20 may be biased to the same front and back side, or the bottom end seal portion 22b and the top end seal portion 23b of the inner bag 20 may be biased to the front and back opposite sides. good.

The upper and lower end seal portions 12b, 13b, 22b, 23b of the exterior 10 or the inner bag 20 do not necessarily have to be perpendicular to the side end seal portions 11a, 21a, respectively. For example, in the bottom gusset portions 12 and 22, oblique seal portions 12c and 22c connected to the lower end seal portions 12b and 22b may be provided so as to be inclined with respect to the side end seal portions 11a and 21a. Further, in the upper gusset portions 13 and 23, the oblique seal portions 13c and 23c connected to the upper end seal portions 13b and 23b may be provided so as to be inclined with respect to the side end seal portions 11a and 21a.

In these oblique seal portions 12c, 13c, 22c and 23c, the inner surfaces of the main surface portions 11 and 21 and the inner surfaces of the gusset portions 12, 13, 22 and 23 are similar to the upper and lower end seal portions 12b, 13b, 22b and 23b. face each other and are joined by a seal.
The angle at which the oblique seal portions 12c, 13c, 22c, and 23c intersect the side end seal portions 11a and 21a is preferably, for example, around 45 degrees, for example, within the range of approximately 30 to 60 degrees.

Moreover, a part of the side end seal portions 11 a and 21 a of the exterior 10 or the inner bag 20 may include the gusset portions 12 , 13 , 22 and 23 . In this case, of the side end seal portions 11a and 21a of the exterior 10 or the inner bag 20, below the folding lines 12a and 22a of the bottom gusset portions 12 and 22 or between the folding lines 13a and 23a of the upper gusset portions 13 and 23 On the upper side, the inner surfaces of the main surface portions 11, 21 and the inner surfaces of the gusset portions 12, 13, 22, 23 may face each other and be joined by a seal.

The exterior 10 is surrounded by side end seal portions 11a, upper and lower end seal portions 12b and 13b, and oblique seal portions 12c and 13c. The circumference of the exterior 10 may be bonded over the entire circumference, or a portion of the circumference of the exterior 10 may be unbonded. An inner bag 20 is accommodated inside each of the seal portions 11 a , 12 b , 12 c , 13 b , 13 c of the exterior 10 .
The exterior 10 may be an outer bag with both ends closed to form a bag-like shape, or may be a cylindrical shape having a bottom on the lower side.

Further, the periphery of the inner bag 20 is surrounded and sealed by side end seal portions 21a, upper and lower end seal portions 22b and 23b, and oblique seal portions 22c and 23c. Inside the seal portions 21a, 22b, 22c, 23b, and 23c at the periphery of the inner bag 20, a filling chamber 25 is formed as a space to be filled with contents. The inner bag 20 is preferably sealed around the filling chamber 25 .

The capacity of the inner bag 20 may be, for example, less than 1 liter or several liters, or may be several tens of liters or more. Fluid materials such as liquids, powders, and granules are preferable as the contents. Specific examples of contents include beverages, seasonings, concentrated undiluted solutions, food additives, fragrances, foods and raw materials such as oils and fats, detergents, photo developers, liquid fertilizers, adhesives, water-based paints, liquid Examples include resins, battery fluids, developers, various industrial chemicals, and non-foods such as pharmaceuticals.

In addition, if the content itself has fluidity, it can also be applied to a mixture in which solids such as linear or small pieces are dispersed in fluids such as liquids and powders. When the solid is flexible and deformable, such as seaweed, it is less likely to clog the spout, so pouring it out together with the liquid ensures fluidity. Even if the fluidity is low at room temperature, for example, if the content has fluidity at a temperature of 40 to 80 ° C. or higher, it can be stored and poured at a temperature that maintains fluidity. The self-supporting packaging bag 30 becomes usable.

In the bottom gusset portion 12 of the exterior 10, the lower end seal portion 12b may be connected to the left and right side end seal portions 11a in order to improve the self-sustainability. In addition, in the upper gusset portion 13 of the exterior 10, at least a part of the upper right or upper left corner in FIG. 1 or 3 outside the oblique seal portion 13c may be removed. In that case, the side end seal portion 11a and the upper end seal portion 13b may not be directly connected and may be separated from each other.

On the other hand, in the inner bag 20 of the present embodiment, as shown in FIG. 4, the four corners of the upper right corner, the lower right corner, the upper left corner, and the lower left corner outside the oblique seal portions 22c and 23c are removed. . When the four corners of the inner bag 20 are removed along the outer edges of the oblique seal portions 22c and 23c, excess film overlap at the corners is suppressed, the resistance when the inner bag 20 expands, and the resistance to the outer package 10 increases. It is preferable because it can reduce friction when contacting.

The bottom gusset portion 12 of the exterior 10 is sandwiched between the main surface portions 11 at the lower portion of the main surface portion 11, and is joined to the main surface portion 11 at the side end seal portion 11a, the lower end seal portion 12b, and the oblique seal portion 12c. The bottom gusset portion 12 spreads between the front and rear main surface portions 11, 11, so that the exterior 10 can stand on its own.

Further, the upper gusset portion 13 of the exterior 10 is sandwiched between the main surface portions 11 at the upper portion of the main surface portion 11, and is joined to the main surface portion 11 at the side end seal portion 11a, the upper end seal portion 13b, and the oblique seal portion 13c. . When the inner bag 20 has upper and lower gusset portions 22 and 23, the gusset portions 22 and 23 spread between the front and rear main surface portions 21 and 21, so that the capacity of the filling chamber 25 can be increased.

The main surface portions 11, 21 and the gusset portions 12, 13, 22, 23 that constitute the exterior 10 and the inner bag 20 may be made of, for example, a resin film or a laminated film containing a resin layer. The resin film may be a monolayer film consisting of one resin layer, or a multilayer film including two or more multilayers.

A film made of a sealant resin such as a thermoplastic resin is used as the single layer film. As a multilayer film, a thermoplastic resin or the like is used as a sealant layer, and as a base layer, a polyester resin such as polyethylene terephthalate (PET), a polyamide resin such as nylon (Ny), polypropylene (PP), ethylene-vinyl alcohol A laminate of resin layers such as polymer (EVOH) is used. Thermoplastic resins constituting the sealant layer include polyethylene (PE), unstretched polypropylene (PP), cyclic polyolefins (COP and COC), polyesters, modified resins thereof, and the like.
As the thermoplastic resin forming the sealant layer and the resin forming the substrate layer, a resin obtained from a plant-derived raw material obtained from biomass can be used.

As a gas barrier layer for blocking gases such as oxygen and water vapor, the substrate layer includes, for example, a vapor deposited layer of metal such as aluminum, a vapor deposited layer of inorganic compounds such as silicon oxide and aluminum oxide, and a vapor deposited layer of inorganic compounds such as EVOH and vinylidene chloride (PVDC). A gas barrier resin layer, a metal foil such as aluminum foil, kraft paper, or the like may be used in combination for lamination. Methods for laminating the sealant layer and the substrate layer include a dry lamination method, an extrusion lamination method, a co-extrusion method, and the like. Between the sealant layer and the resin layer, an adhesive layer or an anchor layer made of an adhesive or an adhesive resin may be provided to bond the two.

In the composite film including a resin layer and a material layer other than resin, materials other than resin include metal, paper, rubber, non-woven fabric, and the like. The main surface portion 11 or the gusset portions 12 and 13 that constitute the exterior 10 may be made of a laminated film including a resin layer and a paper layer. The gusset portions 12 and 13 to be folded in two may be made of a resin film containing no paper layer, and the main surface portion 11 may be a composite film containing a paper layer.

In the exterior 10 or the inner bag 20, the method of joining the main surfaces 11, 21 or the gussets 12, 13, 22, 23 by sealing is not particularly limited. This can be done with a seal or the like. After temporarily and partially melting the sealant on at least one side of the two opposing films, the two films are joined when the sealant solidifies upon cooling. By controlling the range to which energy such as heat is applied, it is possible to separate areas where the sealant is melted and joined and areas where it is not joined.

As shown in FIG. 2A , the side end seal portion 21 a of the inner bag 20 overlaps the side end seal portion 11 a of the exterior 10 . The inner bag 20 is joined between the front and rear main surface portions 11 , 11 of the exterior 10 at the side ends of the exterior 10 .

When the main surface portion 21 of the inner bag 20 has a sealant on both sides, the two main surface portions 11, 11 of the exterior 10 and the two main surface portions 21, 21 of the inner bag 20 are superimposed for sealing. Thus, the inner surfaces of the facing main surface portions 21, 21 of the inner bag 20 can be joined together, and the inner surface of the main surface portion 11 of the exterior 10 and the outer surface of the main surface portion 21 of the inner bag 20 can be joined. The film having the sealant on both sides may be a laminated film having sealant layers on both sides of the substrate layer, or may be a single-layer film made of a sealant material.

As shown in FIG. 5, when the main surface portions 11 and 21 of the exterior 10 and the inner bag 20 respectively have the sealant layers 11s and 21s only on the inner surfaces, the inner surface of the main surface portion 11 of the exterior 10 and the main surface portion of the inner bag 20 21 may not be sufficiently bonded even with a seal. In this case, the inner surfaces of the main surface portion 11 of the exterior 10 may face each other through a through recess 24 formed so as to penetrate the inner bag 20 through a part of the side end seal portion 21a of the inner bag 20. good. As a result, the main surface portions 11 of the exterior 10 are joined together at the connection seal portion 11j, and the inner bag 20 is fixed so as to be sandwiched between the two main surface portions 11, 11 of the exterior 10 around the connection seal portion 11j. be. In this case, even if the outer surface of the main surface portion 21 of the inner bag 20 is not joined to the inner surface of the main surface portion 11 of the outer package 10 by a seal, the side end portion of the inner bag 20 can be joined to the side end portion of the outer package 10. can be done.
In the present embodiment, the side end portion where the inner bag 20 is joined to the main surface portion 11 of the exterior 10 is at least one of the side end portion of the main surface portion 21 of the inner bag 20 and the side end portion of the main surface portion 11 of the exterior 10. is. It is preferable that the inner bag 20 is joined to the main surface portion 11 of the exterior 10 at the lateral end portions of the peripheral portion of the inner bag 20 surrounding the filling chamber 25 .

In the inner bag 20 of the present embodiment, as shown in FIG. 4, at least one through recess 24 is formed in each of the left and right side end seal portions 21a, 21a. The through recess 24 may be, for example, a through hole surrounded by a film forming the inner bag 20 , or a notch part of which is open to the outside of the inner bag 20 . The planar shape of the through hole includes, for example, a circular shape, an elliptical shape, and a rectangular shape. The planar shape of the notch includes, for example, a C shape, an Ω shape, a semicircle, a semiellipse, a U shape, and a rectangle. As described above, if the outer surface of the inner bag 20 is not joined to the inner surface of the exterior 10 by a seal, the periphery of the penetrating concave portion 24 of the inner bag 20 may be caught or rubbed against the periphery of the connection seal portion 11j of the exterior 10. retained. For this reason, when the filling chamber 25 side is the inner side (the right side in FIG. 5) with respect to the connecting seal portion 11j, at least a part of the periphery of the through recess 24 of the inner bag 20 is outside the connecting seal portion 11j (the right side in FIG. 5). 5). For example, a preferable penetrating recess 24 is a perimeter-closed through hole or a notch having an open width narrower than the diameter of the connecting seal portion 11j.

In addition, in the side end seal portions 11a of the exterior 10, four films are overlapped in the same manner as the side end seal portions 11a and 21a at the portions where the main surface portion 11 and the gusset portions 12 and 13 are joined. Therefore, the inner surface of the main surface portion 11 of the exterior 10 is joined to the inner surfaces of the gusset portions 12 and 13 of the exterior 10, or as shown in FIG. The inner surfaces of the main surface portion 11 of the exterior 10 may be joined together.

The through recesses 14 provided in the gusset portions 12 and 13 of the exterior 10 may be, for example, through-holes surrounded by films forming the gusset portions 12 and 13, and a portion of the periphery is open to the outside of the exterior 10. A notch may be used. The planar shape of the through hole includes, for example, a circular shape, an elliptical shape, and a rectangular shape. The planar shape of the notch includes, for example, a C shape, an Ω shape, a semicircle, a semiellipse, a U shape, and a rectangle.

In the lower part or upper part of the exterior 10 or the inner bag 20, the outer surfaces of the double-folded gusset portions 12, 13, 22, 23 face each other. The inner surfaces of the main surface portions 11 and 21 and the inner surfaces of the gusset portions 12, 13, 22 and 23 are sealed at the upper and lower end seal portions 12b, 13b, 22b and 23b or the diagonal seal portions 12c, 13c, 22c and 23c. It is desired that the outer surfaces of the gusset portions 12, 13, 22, and 23 are not joined together when joining them together.

When the films constituting the gusset portions 12, 13, 22, and 23 have sealant layers only on the inner surfaces, the four sheets of films are superimposed on the upper and lower end seal portions 12b, 13b, 22b, and 23b, and the oblique seal portion 12c. , 13c, 22c, and 23c are formed, the outer surfaces of the gusset portions 12, 13, 22, and 23 are not joined together.

When the film forming the gusset portions 12, 13, 22, 23 has sealant on both sides, the film is placed along the folding lines 12a, 13a, 22a, 23a between the outer surfaces of the facing gusset portions 12, 13, 22, 23. An insertion member, such as a metal plate, may be provided facing toward. Alternatively, the sealant layer may be provided only partially, such as on the side end seal portions 11a and 21a, of the outer surfaces of the films constituting the gusset portions 12, 13, 22 and 23 by partial coating. These techniques can also prevent the outer surfaces of the gusset portions 12, 13, 22, and 23 from joining to each other at the positions of the upper and lower end seal portions 12b, 13b, 22b, and 23b and the oblique seal portions 12c, 13c, 22c, and 23c. can.

As shown in FIG. 2B, in the gusset portions 12, 13, 22, and 23 of the present embodiment, four films for the exterior 10 and four films for the inner bag, for a total of eight films, are overlapped. That is, in the lower part, there are four sheets consisting of the front and rear main surface portions 11 and the two-fold bottom gusset portion 12 of the exterior 10, and four pieces consisting of the front and rear main surface portions 21 and the two-fold bottom gusset portion 22 of the inner bag 20. , a total of eight. In the upper part, there are four sheets consisting of the front and rear main surface portions 11 of the exterior 10 and the upper gusset portion 13 folded in two, and four pieces consisting of the front and rear main surface portions 21 of the inner bag 20 and the upper gusset portion 23 folded in two. , a total of eight.

As shown in FIG. 6, at least at the upper ends of the gusset portions 12, 13, 22, and 23, the inner bag 20 is not sandwiched between the upper end seal portion 13b of the exterior 10, and the exterior 10 and the inner bag 20 are separated from each other. It is non-bonded via a gap 31 between. In the lower end portion, the inner bag 20 may not be sandwiched between the lower end seal portion 12b of the exterior 10 and may be non-bonded with the gap 31 interposed therebetween.

When the film constituting the main surface portions 11, 21 and the gusset portions 12, 13, 22, 23 of the exterior 10 and the inner bag 20 has the sealant layers 11s, 12s, 13s, 21s, 22s, 23s only on the inner surface, Even if the upper and lower end seal portions 12b, 13b, 22b, 23b and the oblique seal portions 12c, 13c, 22c, 23c are formed while the eight films are superimposed, the two films facing each other are joined only when the inner surfaces are facing each other. and are not joined when at least one of the opposing films has its outer surfaces facing each other.

For example, at the positions where the upper and lower end seal portions 22b and 23b of the inner bag 20 are formed, the inner surface of the main surface portion 21 of the inner bag 20 and the inner surfaces of the gusset portions 22 and 23 are joined to face each other. The inner surface of the main surface portion 11 and the outer surface of the main surface portion 21 of the inner bag 20 are not joined, and the inner surfaces of the gusset portions 12 and 13 of the exterior 10 and the outer surfaces of the gusset portions 22 and 23 of the inner bag 20 are not joined. are not joined. Further, since the inner bag 20 is not sandwiched between the main surface portion 11 of the outer package 10 and the gusset portions 12, 13 even at the positions where the upper and lower end seal portions 12b, 13b of the outer package 10 are formed, the inner bag 20 is not attached to the outer package 10. Not spliced.

If the film constituting the main surfaces 11, 21 and the gussets 12, 13, 22, 23 of the exterior 10 and the inner bag 20 has sealant on both sides, the upper and lower end seals 12b, 13b, 22b, 23b And when forming the oblique seal portions 12c, 13c, 22c, 23c, it is desirable to prevent the inner surface of the exterior 10 and the outer surface of the inner bag 20 from being joined. For example, after forming the upper and lower end seal portions 22b, 23b and the oblique seal portions 22c, 23c of the inner bag 20, the main surface portion 11 and the gusset portions 12, 13 of the exterior 10 are overlapped on both sides of the inner bag 20, and then , a method of forming upper and lower end seal portions 12b, 13b and oblique seal portions 12c, 13c of the exterior 10, respectively.

In this embodiment, the dimension from the top end to the bottom end of the inner bag 20 is smaller than the dimension from the top end to the bottom end of the exterior 10 . Here, the "dimension from the upper end portion to the lower end portion" includes the seal widths of the upper and lower end seal portions 12b, 13b, 22b, 23b. The inner bag 20 does not overlap the seal portions 11a, 12b, 12c, 13b, and 13c of the exterior 10 at positions other than the side end seal portions 21a of the inner bag 20. As shown in FIG. Therefore, when forming the upper and lower end seal portions 12b, 13b and the oblique seal portions 12c, 13c of the outer package 10, even if the outer surface of the inner bag 20 has a sealant layer, the outer surface of the inner bag 20 should be the inner surface of the outer package 10. will not be joined with

As described above, in the self-supporting packaging bag 30 of the present embodiment, the inner bag 20 is joined between the front and rear main surface portions 11, 11 of the exterior 10 at the side ends on both sides of the filling chamber 25. . Further, with respect to at least the upper end portion of the main surface portion 11 of the outer package 10, the upper end seal portion 23b at the upper end portion of the inner bag 20 is positioned lower than the upper end seal portion 13b at the upper end portion of the outer package 10, and the gap 31 It is non-bonded through Thereby, for example, as shown in FIG. 7, the self-supporting packaging bag 30 of the present embodiment can be self-supported by expanding the bottom portion. In addition, as shown in the following (1) and (2), even if the amount of contents filled in the inner bag 20 is reduced and the inner bag 20 is deflated, the exterior 10 is less likely to be deflated, and the self-sustainability of the present embodiment. The independence of the packaging bag 30 is maintained.

(1) As shown in FIG. 2A, the side end seal portions 11a and 21a where the exterior 10 and the inner bag 20 are joined are always in close contact with each other regardless of the amount of contents in the filling chamber 25. , When the inner bag 20 is deflated, the force to draw the exterior 10 inward is less likely to act.
(2) As shown in FIG. 2B, the position of the upper end seal portion 23b of the inner bag 20 is likely to change according to the amount of contents in the filling chamber 25. As shown in FIG. However, since the exterior 10 and the inner bag 20 are not joined at the upper end seal portions 13b, 23b, even if the position of the upper end seal portion 23b of the inner bag 20 is changed, the upper end seal portion 13b of the exterior 10 is The position is difficult to change.

In this embodiment, the exterior 10 and the inner bag 20 are not joined at the lower end seal portions 12b, 22b as well. As a result, even if the positions of the lower end seal portions 12b, 22b and the upper end seal portions 13b, 23b are exchanged, the exterior 10 is less likely to collapse. When the top and bottom of the packaging bag are specified, the bottom seal portion 22b of the inner bag 20 is sandwiched between the films forming the outer package 10 at the bottom seal portions 12b, 22b. 10 may be joined together.

Further, in this embodiment, the upper gusset portions 13 and 23 are provided on the exterior 10 and the inner bag 20 at the upper portion of the self-supporting packaging bag 30 so that the upper portion is also expanded. This allows the filling chamber 25 to have a large capacity. The upper gusset portions 13, 23 of the exterior 10 or the inner bag 20 may be omitted, and the front and rear main surface portions 11 of the exterior 10 or the front and rear main surface portions 21 of the inner bag 20 may be joined together.

Alternatively, the upper end seal portions 13b, 23b of the exterior 10 or the inner bag 20 may be omitted, and the front and rear main surface portions 11 of the exterior 10 or the front and rear main surface portions 21 of the inner bag 20 may be non-bonded. . When the exterior 10 does not have the upper end seal portion 13 b , the upper end seal portion 23 b of the inner bag 20 may be positioned so as to overlap the upper end portion of the exterior 10 . When the front and rear main surface portions 11 are not joined to each other at the upper end portion of the exterior 10, the upper portion of the exterior 10 is open to the outside. The gap 31 with 20 is never decompressed.

When the periphery of the exterior 10 is joined and the inner bag 20 is sealed, the exterior 10 may collapse when the pressure in the gap 31 between the exterior 10 and the inner bag 20 is reduced. Therefore, as shown in FIG. 6, for example, if the exterior 10 is provided with an air inlet hole 15, air can flow from the outside toward the gap 31, so that the exterior 10 can be prevented from collapsing. The air inlet hole 15 can be provided in at least one or more of the main surface portion 11 of the exterior 10 or the gusset portions 12 and 13 . Instead of providing the air inlet holes 15, at least one film of the sheath 10 may consist of a highly gas-permeable film.

As shown in FIG. 7 , the inner bag 20 may have a spout member 32 capable of spouting the contents to the outside of the exterior 10 . In the present embodiment, the spout member 32 is provided at a position below the center in the vertical direction within the plane of the main surface portion 11 on the front side of the self-supporting packaging bag 30 . The spout member 32 has a tubular portion 33 extending in the front-rear direction of the self-supporting packaging bag 30 and a flange portion 34 extending in a plane perpendicular to the front-rear direction.

It is preferable that the flange portion 34 can be joined at its inner surface or outer surface to the inner surface or outer surface of the film forming the exterior 10 or the inner bag 20 . The position of the flange portion 34 in the front-rear direction may be inside the inner bag 20 , between the inner bag 20 and the exterior 10 , or outside the exterior 10 . In the example shown in FIGS. 8 and 9, the outer surface of the flange portion 34 is joined to the inner surface of the main surface portion 21 of the inner bag 20 by sealing. The flange portion 34 has a surface substantially perpendicular to the longitudinal direction of the cylindrical portion 33 as a bonding surface for the film. Thereby, even if the surface of the main surface portion 21 is substantially perpendicular to the longitudinal direction of the cylindrical portion 33 , the inner surface of the main surface portion 21 can be easily joined to the flange portion 34 .
In the region where the spout member 32 is joined to the inner bag 20, the main surface portions 11, 21 of the exterior 10 and the inner bag 20 have spout insertion holes 16, 26 into which the cylindrical portion 33 is inserted.

In the example shown in FIG. 8 , the inner surface of main surface portion 11 of exterior 10 is joined to the outer surface of main surface portion 21 of inner bag 20 . In this case, the main surface portion 21 of the inner bag 20 can be composed of a multilayer film having sealant layers 21s on both sides or a single layer film made of sealant. Although not shown in particular, when the outer surface of the main surface portion 11 of the exterior 10 can be joined to the inner surface of the flange portion 34, the outer surface of the main surface portion 11 of the exterior 10 is joined to the inner surface of the flange portion 34, and the main surface portion 11 of the exterior 10 The outer surface of the main surface portion 21 of the inner bag 20 may be joined to the inner surface of the inner bag 20 .

In the example shown in FIG. 9, main surface portions 11 and 21 of exterior 10 and inner bag 20 have sealant layers 11s and 21s only on the inner surfaces. The spout insertion hole 26 of the inner bag 20 is formed larger than the spout insertion hole 16 of the exterior 10.例文帳に追加Thereby, the inner surface of the main surface portion 11 of the exterior 10 can be joined to the flange portion 34 of the spout member 32 through the spout insertion hole 26 of the inner bag 20 .
Although not shown in particular, when the outer surface of the main surface portion 21 of the inner bag 20 can be joined to the inner surface of the flange portion 34, the outer surface of the main surface portion 21 of the inner bag 20 is joined to the inner surface of the flange portion 34, The inner surface of the main surface portion 11 of the exterior 10 may be joined to the outer surface. When the exterior 10 and the inner bag 20 are respectively joined to the opposite surfaces of the flange portion 34, the size relationship of the spout insertion holes 16 and 26 is not particularly limited.
Further, when the outer surfaces of the main surface portions 11 and 21 of the exterior 10 and the inner bag 20 can be joined to the inner surface of the flange portion 34, the spout insertion hole 26 of the inner bag 20 is made smaller than the spout insertion hole 16 of the exterior 10, The outer surface of the main surface portion 21 of the inner bag 20 can also be joined to the flange portion 34 of the spout member 32 through the spout insertion hole 16 of the exterior 10 .

When filling the self-supporting packaging bag 30 with the content, the content may be injected through the spout member 32 in the direction opposite to the pouring. A filling spout member (not shown) may be provided separately from the pouring spout member 32 . Instead of providing a spout member for filling, a part of the sealed portion around the exterior 10 and the inner bag 20 is left unsealed before filling the contents, and after filling the contents through the unsealed portion , the unsealed portion may be closed by a seal.

The connection between the inner bag 20 and the spout member 32 is preferably continuously sealed over the entire circumference of the spout member 32 to prevent leakage of the contents. On the other hand, the joint between the exterior 10 and the spout member 32 may cover the entire circumference of the spout member 32 or may be part of the circumference. For example, when a local through recess that penetrates the main surface portion 21 is provided around the spout insertion hole 26 of the inner bag 20, the main surface portion 11 of the exterior 10 is spouted through the through recess of the main surface portion 21 of the inner bag 20. It can also be joined with the member 32 .

In the region where the spout member 32 is joined to the inner bag 20, the through recess provided in the inner bag 20 may be, for example, a through hole surrounded by a film that constitutes the inner bag 20, and a part of the periphery is a spout insertion. A notch that is open to the inside of the hole 26 may be used. The planar shape of the through hole includes, for example, a circular shape, an elliptical shape, and a rectangular shape. The planar shape of the notch includes, for example, a semicircular shape, a semielliptical shape, a U shape, a rectangular shape, and the like.

The example shown in FIG. 9 is a case in which a through recess is formed over the entire circumference of the spout insertion hole 26 of the inner bag 20 to enable joining of the exterior 10 and the spout member 32 . When the through recesses are locally formed around the spout insertion hole 26 of the inner bag 20, the number and circumferential range of the through recesses are not particularly limited, but for example, three or more places in the circumferential direction can be mentioned.

Materials for forming the spout member 32 include polyethylene (PE), polypropylene (PP), ethylene-vinyl acetate copolymer (EVA), polyester such as polyethylene terephthalate (PET), polyamide such as nylon, and adhesive polyolefin. , cyclic polyolefin, and polybutylene. A sealant is preferably provided on at least the outer surface where the spout member 32 is joined to the exterior 10 or the inner bag 20 .
Resins obtained from plant-derived raw materials obtained from biomass can also be used as resins for thermoplastics and sealants.

The position where the spout member 32 is attached to the inner bag 20 is not particularly limited. A spout member may be sandwiched between two sheets of film facing each other at any one of the seal portions 21a, 22b, 22c, 23b, and 23c to join them.

When the spout member 32 is attached to the main surface portion 21 , at least a portion of the spout member 32 may overlap the gusset portions 22 and 23 , or the spout member 32 may not overlap the gusset portions 22 and 23 . A spout member 32 is preferably provided in the vicinity of the lower end seal portion 22b in order to reduce the amount of remaining content when the content is completely poured out while the self-supporting packaging bag 30 is left on its own.

When the spout member 32 is attached to the gusset portions 22 and 23, the thickness when folded into a flat shape increases. It is possible to reduce the remaining amount of time. In this case, the spout member 32 may be thinned, or a tube such as a flexible tube or hose may be connected to the tip of the spout member 32 .

When the spout member is sandwiched between two films, the spout member can be sealed between the films of the inner bag. Furthermore, in order to fix the spout member between the films of the exterior, either the inner surface of the film of the exterior is joined to the outer surface of the film of the inner bag, or the outer surface of the spout member is not covered with the film of the inner bag, A sheath may be joined with the spout member. To join the spout member between two films, the inner surface of the film may be sealed to the side surface of the tube or flange. In this case, the shape of the flange portion in the plane perpendicular to the cylindrical portion is preferably an ellipse having a minor axis in the direction in which the two films face each other, and both ends in the major axis direction of the ellipse are V-shaped. It may have a sharp shape.

The vertical direction when the self-supporting packaging bag 30 is made to stand on its own and the vertical direction when pouring out the contents may be the same or different. Pouring out the contents while the self-supporting packaging bag 30 stands on its own facilitates the pouring operation. By tilting the self-supporting packaging bag 30 or turning it upside down to pour out the contents, it is possible to reduce the remaining amount when the contents are completely poured out.

It is preferable that the spout member 32 is provided with a cap, a cock, a tube, or the like so that the contents can be opened and closed so that the contents can be poured little by little without pouring out the contents from the spout member 32 all at once. By connecting a pipe such as a tube or hose to the spout member 32 and pouring out the contents from the tip of the pipe, the contents can be easily supplied even at a distance from the self-supporting packaging bag 30. - 特許庁

When the amount of contents to be poured out at one time is large, in order to increase the speed at which air is drawn into the gap 31 between the exterior 10 and the inner bag 20, an openable and closable air inflow spout member is attached to the exterior 10, A wide open air inlet hole may be obtained when opened. If the contents are not easily affected by oxygen or moisture in the air, the inner bag 20 is provided with an openable/closable spout member for inflow of air, and the spout member for pouring and the spout member for inflow of air are opened at the same time. Thereby, the pouring speed of the contents can be increased.

FIG. 10 is a front view of the self-supporting packaging bag of the second embodiment. The self-supporting packaging bag 30A of this embodiment is the same as the self-supporting packaging bag of the first embodiment, except that the exterior 10A does not have the upper gusset portion 13 and the inner bag 20A does not have both the gusset portions 22 and 23. 30 is constructed in the same manner. In the following embodiments, the same reference numerals may be used for configurations that are common to the first embodiment, and overlapping descriptions may be omitted. Although not particularly shown, in the self-supporting packaging bag 30A of the second embodiment, the exterior 10A and the inner bag 20A also have main surface portions 11 and 21 that form a pair on both front and rear sides, respectively.

The upper end seal portion 11b of the exterior 10A of the second embodiment differs from the upper end seal portion 13b of the exterior 10 of the first embodiment in that the inner surfaces of the main surface portions 11 are directly opposed to each other and joined. In the second embodiment, the upper end seal portion 11b of the exterior 10A may be omitted, and the front and rear main surface portions 11 of the exterior 10A may be non-bonded. When the front and rear main surface portions 11 of the exterior 10A are not joined, the upper end seal portion 21c of the inner bag 20A is at the same height as or higher than the upper end seal portion 11b of the exterior 10A. good.

The lower end seal portion 21b of the inner bag 20A of the second embodiment differs from the lower end seal portion 22b of the inner bag 20 of the first embodiment in that the inner surfaces of the main surface portion 21 are directly opposed and joined. Further, the upper end seal portion 21c of the inner bag 20A of the second embodiment differs from the upper end seal portion 23b of the inner bag 20A of the first embodiment in that the inner surfaces of the main surface portion 21 are directly opposed and joined. .

In this embodiment, a spout member 32A is provided at the upper end seal portion 21c of the inner bag 20A. The spout member 32A may have the cylindrical portion 33 sandwiched between the main surface portions 21 of the inner bag 20A. The spout member 32A may have the above-described flange portion at a location sealed by the upper end seal portion 21c. In addition, in the upper end seal portion 11b of the exterior 10A, a non-joint portion 17 is provided between the front and rear main surface portions 11 of the exterior 10A at least in a portion overlapping the spout member 32A. In this case, the non-joint portion 17 functions as an air inflow hole, and air can flow between the exterior 10A and the inner bag 20A through the non-joint portion 17 .

As with the self-supporting packaging bag 30 of the first embodiment, the self-supporting packaging bag 30A of this embodiment is located at the upper end of the inner bag 20A with respect to at least one upper end of the main surface portion 11 of the exterior 10A. The upper end seal portion 21c is positioned lower than the upper end seal portion 11b at the upper end portion of the exterior 10A and is not joined with the gap 31 therebetween. As a result, even if the amount of the contents filled in the inner bag 20A decreases, the exterior 10A is less likely to shrink and maintains its self-standing.

Further, in the specific example shown in FIG. 10, the spout member 32A provided at the upper end portion of the inner bag 20A is not joined to the main surface portion 11 of the exterior 10A. As a result, even if the amount of the contents filled in the inner bag 20A decreases, the exterior 10A is less likely to shrink and maintains its self-standing. In this case, the spout member 32A may be positioned higher than the upper end seal portion 11b at the upper end of the exterior 10A. Also, although not shown, a portion of the upper end seal portion 21c of the inner bag 20A may be positioned higher than the upper end seal portion 11b of the outer package 10A through the non-joint portion 17 at the upper end of the outer package 10A.

In the second embodiment, the exterior 10A has the bottom gusset portion 12 and the inner bag 20A does not have the bottom gusset portion 22, so that the exterior 10A has two lower end seal portions 12b in the front and rear. , the inner bag 20A has only one lower end seal portion 21b. In this case, the lower end seal portion 21b of the inner bag 20A is inserted between the front main surface portion 11 and the bottom gusset portion 12 of the exterior 10A, or is inserted between the rear main surface portion 11 and the bottom gusset portion 13 of the exterior 10A. It is arbitrary whether it is inserted between

In the self-supporting packaging bags 30, 30A of the first and second embodiments, the inner surface of the main surface portion 11 of the outer packaging 10, 10A and the outer surface of the main surface portion 21 of the inner bag 20, 20A are formed by the side end seal portions 11a, 11a and 20A. It is bonded only at 21a and is non-bonded otherwise. However, as a solution to the above problem, the range where the inner surface of the main surface portion 11 of the exterior and the outer surface of the main surface portion 21 of the inner bag are joined in areas other than the side end seal portions 11a and 21a is at least It is optional, except that it is desirable that one top edge be non-bonded to the top edge of the sheath.

For example, as a modified example of the first embodiment, even if the inner surface of the front main surface portion 11 of the exterior 10 and the outer surface of the front main surface portion 21 of the inner bag 20 are entirely joined together, the rear main surface portion By ensuring the gap 31 between 11 and 21, even if the contents decrease and the inner bag 20 shrinks, the exterior 10 does not shrink and the self-supporting property can be secured. Therefore, the front main surfaces 11 and 21 of the exterior 10 and the inner bag 20 do not need to be separate films.

For example, as in the third embodiment shown in FIG. 11, it is possible to omit the main surface portion 11 on one side of the exterior 10 in FIG. 2B. In the self-supporting packaging bag 30B of the present embodiment, on the side where the main surface portion 11 of the outer packaging 10B is omitted, the upper end portion and the lower end portion of the main surface portion 21B on one side of the inner bag 20B have the same outer shape as the main surface portion 11 of the outer packaging 10B. It has been extended to fit the dimensions. The extended portion of the main surface portion 21B of the inner bag 20B is joined to the gusset portions 12 and 13 of the outer package 10B while also functioning as the omitted main surface portion 11 of the outer package 10B. 13b is configured. On the side opposite to the side where the main surface portion 11 of the outer package 10B is omitted, there is a gap 31 between the upper end seal portion 13b of the outer package 10B and the upper end seal portion 23b of the inner bag 20B. Even if the bag 20B is deflated, the exterior 10B will not be deflated and the self-sustainability can be ensured.

At the side end portion of the self-supporting packaging bag 30B of the third embodiment, the side end portion of the self-supporting packaging bag 30 of the first embodiment shown in FIG. can be configured in the same way as When the main surface portion 11 of the exterior 10B that is not omitted is taken as the front, the front view of the self-supporting packaging bag 30B can be expressed in the same manner as in FIG. When the main surface portion 21B having the extension portion is taken as the front, the main surface portion 21B having the extension portion corresponds to the main surface portion 11 of the exterior 10 of FIG.

Of the side ends of the self-supporting packaging bag 30B of the third embodiment, in the side end seal portion 21a having the through recess 24 of the inner bag 20B, the main surface portion 21B having the extension portion is not provided with the through recess 24, and the extension The through recess 24 may be provided only in the main surface portion 21 of the inner bag 20B that is sandwiched between the main surface portion 21B having a portion and the main surface portion 11 of the exterior 10B. In this case, the inner surface of the main surface portion 21B having the extension portion and the inner surface of the main surface portion 11 of the exterior 10B can be joined through the through recess 24 of the main surface portion 21 of the inner bag 20B. Alternatively, the sealant layer may be provided on the outer surface of the main surface portion 21 of the inner bag 20B without providing the through concave portion 24 in the inner bag 20B, and joined to the inner surface of the main surface portion 11 of the exterior 10B.

Of the side ends of the self-supporting packaging bag 30B of the third embodiment, in the portions where the gussets 12 and 13 are provided on the outer packaging 10B, between the main surface portion 21B having the extension and the main surface portion 11 of the outer packaging 10B. The gusset portions 12 and 13 of the exterior 10B can be sandwiched and fixed. The sealing portion between the main surface portion 21B having the extension portion and the gusset portions 12 and 13 of the exterior 10B is not limited to the upper and lower end seal portions 12b and 13b shown in FIG. Portions corresponding to portions 12c and 13c can be included. Through the through recesses 14 formed in the gusset portions 12 and 13 of the exterior 10B, the inner surface of the main surface portion 21B having the extension can be joined to the inner surface of the main surface portion 11 of the exterior 10B.

In the third embodiment, when the spout member is provided on the main surface portions 21 and 21B of the inner bag 20B, the spout member is provided on the main surface portion 21B of the inner bag 20B on the side where the main surface portion 11 of the exterior 10B is omitted. becomes easier. It is possible to provide a spout member on the main surface portion 21 of the inner bag 20B on the side where the main surface portion 11 of the exterior 10B overlaps, as shown in FIGS. 8 and 9 of the first embodiment. It is also possible to make the connection between the spout member and the spout insertion hole 16 of the exterior non-bonded.

Further, as a modified example of the first embodiment, even if the inner surface of the bottom gusset portion 12 of the exterior 10 and the outer surface of the bottom gusset portion 22 of the inner bag 20 are entirely joined together, the upper end seal portions 13b, 23b By ensuring the gap 31 therebetween, even if the inner bag 20 shrinks due to the decrease in the contents, the exterior 10 does not shrink and the self-supporting property can be secured. Therefore, the bottom gusset portions 12, 22 of the exterior 10 and inner bag 20 need not be separate films.

For example, as in the fourth embodiment shown in FIG. 12, it is possible to omit the bottom gusset portion 12 of the exterior 10 in FIG. 2B. In the self-supporting packaging bag 30C of this embodiment, the lower end of the bottom gusset portion 22C of the inner bag 20C extends below the lower end seal portion 22b for the main surface portion 21 of the inner bag 20C. The extended portions of the bottom gusset portion 22C of the inner bag 20C are joined to the lower end portions of the main surface portion 11 of the outer package 10C to form the lower end seal portion 11c of the outer package 10C. There is a clearance 31 between the upper end seal part 13b of the outer package 10C and the upper end seal part 23b of the inner bag 20C, and even if the contents decrease and the inner bag 20C shrinks, the outer package 10C does not shrink and secures self-standing. can be done.

In the third and fourth embodiments, the outer surfaces of the main surface portion 21B or the bottom gusset portion 22C, which are part of the inner bags 20B and 20C, are exposed to the outside without being covered with the outer packagings 10B and 10C, respectively. However, in common with the first to fourth embodiments, the gap 31 between the top sealing portion of the exterior and the top sealing portion of the inner bag is surrounded and sealed by the exterior. Therefore, as in the example shown in FIG. 6, also in the third and fourth embodiments, the air inlet holes 15 may be provided in the main surface portion 11 or the gusset portions 12 and 13 of the exteriors 10B and 10C.

Although the present invention has been described above based on 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 exterior or inner bag is composed of four surfaces, namely, a pair of front and rear main surface portions, a bottom gusset portion, and an upper gusset portion, one or two main surface portions and one or two gusset portions are provided. However, a sheet of film may be folded at the boundary between adjacent surfaces without being cut. Alternatively, a tube having a center axis in the left-right direction is folded in two places at the upper end and at two places at the lower end, so that the two front and rear main surfaces and the two upper and lower gussets are divided. may

When the exterior or inner bag is composed of three sides, a pair of front and rear principal surfaces and a bottom gusset, the one or two principal surfaces and the bottom gusset are cut from a sheet of film. Instead, it may be folded at the boundary line between adjacent surfaces. Alternatively, a tube having a central axis in the left-right direction may be folded in a mountain fold at one upper end portion and two lower end portions to divide the front and rear main surface portions and the bottom gusset portion. .

When the inner bag is composed of a pair of front and rear main surface portions without the upper and lower gusset portions, a sheet of film is folded at the upper or lower end of the inner bag without cutting. There may be. Alternatively, a tube having a central axis in the horizontal direction is stacked in mountain folds at the upper and lower ends of the inner bag, or a tube having a central axis in the vertical direction is folded in a mountain at both the left and right side ends of the inner bag. A configuration in which two front and rear main surface portions are divided by folding and overlapping may be used.

If the exterior or inner bag is composed of films in a number less than the number of faces, joining with a seal may be omitted along the folds at the boundaries of two adjacent faces. The rigidity of the film can be increased by joining the inner surfaces with a seal along the folded line. In addition, at the side edges where the exterior and the inner bag are joined, for example, even if the side edges of the inner bag are closed by folding back the film, when the exterior and the inner bag are joined, the folded portions are Side edge seals are preferably formed along.

When the main surface portion and the gusset portion of the exterior or inner bag are composed of separate films, the film constituting the gusset portion is preferably thinner or more flexible than the film constituting the main surface portion. . This facilitates folding along the folding lines of the gusset portion.

The main surface of the exterior or the inner bag not only forms the outer shape of the exterior or the inner bag, but also has a handle (holding portion) projecting like an ear and a tapered shape on the peripheral edge such as the upper end and the side end. It may have accessories such as spouts, display tags, and the like. These appendages may be formed integrally with the film that constitutes the main surface portion and the like. In order to form a handle (holding portion) on the exterior, for example, a hole for passing a finger may be provided in a triangular corner surrounded by the side end seal portion, the upper end seal portion and the oblique seal portion.

The method of taking out the contents little by little is not limited to pouring out through a spout, and includes, for example, a method of sucking the contents through a straw, a hose, an injection needle, or the like. An opening for taking out the contents may be provided in advance so as to communicate with the inner bag, or the opening for taking out the contents may be formed or attached to the inner bag when the contents are used.

Reference Signs List 10, 10A, 10B, 10C Exterior 11 Exterior main surface 12 Exterior bottom gusset 13 Exterior upper gusset 14 Exterior through recess 15 Air inlet 16 Exterior Spout insertion hole 20, 20A, 20B, 20C... inner bag 21, 21B... main surface portion of inner bag 22, 22C... bottom gusset portion of inner bag 23... upper gusset portion of inner bag 24... inner bag Penetration recess 25 Filling chamber 26 Spout insertion hole of inner bag 30, 30A, 30B, 30C Self-supporting packaging bag 31 Gap between exterior and inner bag 32, 32A Spout member 33 Cylinder Part 34... Flange part.

Claims (11)

Equipped with an inner bag filled with contents and an exterior housing the inner bag,
The exterior has a main surface provided on at least one of the front and rear of the inner bag,
The exterior is self-supporting with a bottom gusset,
The periphery of the inner bag is enclosed and sealed by left and right side end seal portions, an upper end seal portion, a lower end seal portion, and an oblique seal portion between them, and is outside the oblique seal portion, Four corners have been removed: upper right, lower right, upper left, lower left,
By joining the exterior and the inner bag at the side end seal portion, the inner bag is joined to the main surface portion of the exterior at the side end portion with respect to the space to be filled with the content, and A self-supporting self-supporting bag having a non-bonded portion with respect to at least an upper end portion of a main surface portion of an exterior, and wherein the upper end seal portion, the lower end seal portion and the oblique seal portion of the inner bag are not bonded to the exterior. sex packaging bag. Equipped with an inner bag filled with contents and an exterior housing the inner bag,
The exterior has a main surface portion provided only on one of the front and rear sides of the inner bag,
The exterior includes an upper gusset portion joined to the upper end of the main surface portion of the exterior and a bottom gusset portion joined to the lower end of the main surface portion of the exterior. The upper and lower ends of the main surface of the inner bag are extended on the side from which the is omitted, and of these extensions, the upper end is the upper gusset of the exterior, and the lower end is the bottom gusset of the exterior. It is joined and has independence,
The inner bag is joined to the main surface portion of the outer packaging at a side end portion with respect to the space filled with the contents, and has a non-joined portion at least to the upper end portion of the main surface portion of the outer packaging. Self-supporting packaging bag. Equipped with an inner bag filled with contents and an exterior housing the inner bag,
The exterior has main surface portions provided on both the front and rear sides of the inner bag,
The inner bag has main surface portions provided on both the front and rear sides of the inner bag, and a bottom gusset portion joined to the lower ends of the main surface portions, and has self-supporting properties,
The lower end of the bottom gusset portion of the inner bag extends downward from the lower end sealing portion with respect to the main surface portion of the inner bag, and the extended portion of the bottom gusset portion of the inner bag extends from the lower end portion of the main surface portion of the exterior. spliced,
The inner bag is joined to the main surface portion of the outer packaging at a side end portion with respect to the space filled with the contents, and has a non-joined portion at least to the upper end portion of the main surface portion of the outer packaging. Self-supporting packaging bag. The exterior includes a pair of main surface portions on both front and rear sides of the inner bag, and the bottom gusset portion joined between the pair of main surface portions at a lower portion of the main surface portion, and is self-supporting. Self-supporting packaging bag according to claim 1, characterized in that. 5. The self-supporting packaging bag according to claim 1 , 2 or 4 , wherein the inner bag has a bottom gusset portion. 6. The bag according to any one of claims 1 to 5 , characterized in that an upper end seal portion is formed at the upper end of the exterior, and the upper end of the inner bag is positioned lower than the upper end seal portion of the exterior. Self-supporting packaging bag. The self-supporting packaging bag according to any one of claims 1 to 6 , wherein the exterior is joined at its periphery so as to seal the inner bag, and has an air inlet hole in the exterior. In the region where the inner bag is joined to the main surface of the exterior at the side end, the inner surface of the main surface of the exterior is joined to the outer surface of the inner bag, or the inner bag is connected through a recess penetrating the inner bag. The self-supporting packaging bag according to any one of claims 1 to 7 , wherein main surface portions of the outer packaging are joined together. The self-supporting packaging bag according to any one of claims 1 to 8 , wherein the inner bag has a spout member from which the contents can be poured outside the exterior. In the region where the spout member is joined to the inner bag, the inner surface of the main surface portion of the exterior is joined to the outer surface of the inner bag, or the main surface portion of the exterior is connected to the main surface portion through a recess penetrating the inner bag. 10. The self-supporting packaging bag according to claim 9 , wherein the self-supporting packaging bag is joined with a spout member. The self-supporting packaging bag according to any one of claims 1 to 10 , wherein the exterior is composed of a laminated film containing a resin layer and a paper layer.

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