JP2021020723A - Self-supporting packaging bag and self-supporting packaging bag set - Google Patents

Abstract

To provide a self-supporting packaging bag that can suppress a shaking movement when a plurality of bags are housed in a box.SOLUTION: A self-supporting packaging bag 10 is composed of a laminated film including a base material layer and a sealant layer, and has at least a front surface portion 111 and a back surface portion 112, and has an accommodating portion 14s that can accommodate contents between the front surface portion 111 and the back surface portion 112, a seal portion formed around the accommodating portion 14s, and a scheduled seal portion provided around the accommodating portion 41s as needed. An adhesive member 31 is provided on a part of at least one surface of the front surface portion 111 and the back surface portion 112 constituting the accommodating portion 14s, and the adhesive member 31 has a plurality of concave shapes evenly formed on both sides thereof.SELECTED DRAWING: Figure 1

Description

The present invention relates to a self-supporting packaging bag containing a refillable liquid, retort food, etc., and a self-supporting packaging bag set including the self-supporting packaging bag.

For detergents, lotions, etc., refillable packaging bags containing the same contents are sold in order to use the main container repeatedly. In this type of packaging bag, in order to facilitate opening, a knob portion held by the user at the time of opening and an planned opening line that has been easily opened are provided (see, for example, Patent Document 1). ..

JP-A-2017-154459

The packaging bag may be transported in a state where a plurality of the packaging bags are housed in a packing box. At that time, if the packaging bag sways inside the box, the knobs of the adjacent packaging bags may get caught, a part of the planned opening line may be torn, and the contents may leak out. In addition, when the packaging bag sways inside the box, the bulging portions of the packaging bag rub against each other, which may scratch the surface.
An object of the present invention is to provide a self-supporting packaging bag and a self-supporting packaging bag set capable of suppressing shaking movement when a plurality of pieces are housed in a box.

The present invention solves the problem by the following solution means. In addition, in order to facilitate understanding, the description will be given with reference numerals corresponding to the embodiments of the present invention, but the present invention is not limited thereto. Further, the configurations described with reference numerals may be appropriately improved, or at least a part thereof may be replaced with other configurations.

The first invention is composed of a laminated film (40) including at least a base material layer (41) and a sealant layer (44), and has at least a front surface portion (111) and a back surface portion (112). An accommodating portion (14s) capable of accommodating the contents between the and the back surface portion, seal portions (21a, 22a, 23a) formed around the accommodating portion, and if necessary, around the accommodating portion. A self-supporting packaging bag including a planned seal portion to be provided, and an adhesive member (31) is provided on a part of at least one surface of the front surface portion and the back surface portion constituting the storage portion, and the adhesive The member has a plurality of concave shapes (31s) uniformly formed on both sides thereof, and the average value of the diameters of the respective concave openings opened on the first surface is set to ^Dave _1, and the first When the average value of the diameters of the respective concave openings opened on the second surface opposite to the surface of the surface is D ^ave ₂ , | D ^ave ₁ − D ^ave ₂ | / D ^ave ₂ ≦ 0 A self-supporting packaging bag (10) that satisfies the relationship of .5.

The second invention is the self-supporting packaging bag according to the first invention, in which the adhesive member is provided at least in a region of 10% or more and 50% or less from the bottom with respect to the total length of the self-supporting packaging bag in the height direction. It is a self-supporting packaging bag.

The third invention is a self-supporting packaging bag according to the first or second invention, wherein the adhesive member includes a center in the width direction of the self-supporting packaging bag and is a region of 10% or more and 70% with respect to the total width. It is at least a self-supporting packaging bag provided in.

The fourth invention is a self-supporting packaging bag set including a plurality of self-supporting packaging bags according to any one of the first to third inventions containing the contents, and the plurality of self-supporting packaging bags via the adhesive member. Is a self-supporting packaging bag set (100) to which is connected.

According to the self-supporting packaging bag and the self-supporting packaging bag set according to the present invention, it is possible to suppress the shaking movement when a plurality of self-supporting packaging bags are housed in a box.

It is a front view which shows the packaging bag 1 of an embodiment. It is a cross-sectional view of s1-s1 shown in FIG. It is sectional drawing of the laminated film 40 used for a packaging bag 10. (A) to (C) are diagrams for explaining the form of the adhesive sheet 30 when used. It is a figure which shows the manufacturing apparatus of the adhesive sheet 30. It is a figure explaining the manufacturing method of the adhesive sheet 30. It is an enlarged photograph of the adhesive member 31 of the adhesive sheet 30 of the embodiment when viewed from the direction of the adherend side. It is an enlarged view in the cross section in the direction orthogonal to the sheet surface of the adhesive member 31 of the adhesive sheet 30 of an Example. It is a figure which shows the peeling force of an Example and a comparative example. (A) and (B) are diagrams showing the observation results of Sample 1. (A) and (B) are diagrams showing the observation results of Sample 2. (A) and (B) are diagrams showing the observation results of Sample 3. (A) and (B) are diagrams showing the observation results of Sample 4. FIG. 5 is a conceptual diagram showing a state in which a plurality of packaging bags 1 are housed in a packaging box 60.

Hereinafter, embodiments of the present disclosure will be described. The drawings attached to the present specification are all schematic drawings, and the shape, scale, aspect ratio, etc. of each part are changed or exaggerated from the actual product in consideration of ease of understanding. Further, in the drawings, hatching indicating a cross section of the member is appropriately omitted.
In the present specification and the like, terms that specify the shape, geometric conditions, and the degree thereof, for example, terms such as "orthogonal" and "direction", are referred to as "orthogonal" in addition to the strict meaning of the terms. Includes a range that can be regarded as a range, and a range that can be generally regarded as that direction.

In the drawings of the embodiments, coordinate systems of X and Y that are orthogonal to each other are described as needed. In this coordinate system, the width direction of the packaging bag 10 is the X direction, and the height direction orthogonal to the width direction is the Y direction. In the width direction (X direction), the right direction in the figure is the X1 direction, and the left direction is the X2 direction. In the height direction (Y direction), the upper direction in the figure is the Y1 direction, and the lower direction is the Y2 direction. In addition, in this specification, "-direction" is also appropriately referred to as "-side". In addition, the notation of "up / down / left / right" is also changed as appropriate. For example, "lower side" may be changed to "bottom side".

In the description of the present embodiment, the state in which the contents are stored in the storage portion 14s (described later) of the main body portion 14 will be described as “packaging bag 1”, but the bag before the contents are stored in the storage portion 14s. Even if there is only a state, it is within the scope of the present invention. In this case, for example, the sealed portion (21a) formed around the accommodating portion may be an unsealed planned sealing portion (21a).

FIG. 1 is a front view showing the packaging bag 1 of the present embodiment. FIG. 2 is a cross-sectional view taken along the line s1-s1 shown in FIG. In FIG. 2, the illustration of the contents is omitted.
The packaging bag (self-supporting packaging bag) 10 of the present embodiment is, for example, a packaging bag for storing contents such as liquid detergent and lotion, which can be refilled in a main body container such as a bottle. The packaging bag 10 of the present embodiment is a packaging bag 1 having a sealed outer circumference when the contents are contained in the accommodating portion 14s (described later). On the other hand, when the contents are not contained in the accommodating portion 14s, the packaging bag is provided with the planned seal portion 21a and the opening portion 21b. Hereinafter, the packaging bag 10 will be mainly described, but both the packaging bag 10 before the contents are stored and the packaging bag 1 after the contents are stored are both within the scope of the packaging bag according to the present invention.

As shown in FIG. 1, the packaging bag 10 includes a front surface film 11, a back surface film 12, and a bottom surface film 13 as main parts.
The surface film 11 is a member arranged on the front side (front side in the drawing) of the packaging bag 10. For example, a product name or the like is printed on the surface film 11. Hereinafter, in the packaging bag 10, the portion formed by the surface film 11 is also referred to as “surface portion 111”. The back surface film 12 is a member arranged on the back side (back side in the drawing) of the packaging bag 10. As product information, for example, handling method, ingredients, information on the manufacturer, and the like are printed on the back film 12. Hereinafter, in the packaging bag 10, the portion formed of the back surface film 12 is also referred to as “back surface portion 112”.

The bottom film 13 is a member arranged on the bottom side (Y2 side) of the packaging bag 10. The front surface film 11, the back surface film 12, and the bottom surface film 13 are configured as a laminated film 40 (described later). The packaging bag 10 is formed by heat-welding the outer peripheral portions of the front surface film 11, the back surface film 12, and the bottom surface film 13.
Unless otherwise specified in the present specification and drawings, the front and back surfaces of the front and back films 11 and the back surface films 12 constituting the packaging bag 10 have symmetrical shapes. In the packaging bag 10, the components of the front surface portion 111 and the components of the back surface portion 112 are substantially the same. In the following description, the shape of the front surface portion 111 will be mainly described, and the description of the shape of the back surface portion 112 will be omitted as appropriate.

The packaging bag 10 of the first embodiment is configured to be self-supporting in the form of a packaging bag 1 (see FIG. 1) filled with contents. The packaging bag 10 is configured as a so-called bottom gusset bag in which a gusset is formed on the bottom portion 23 thereof. In the present specification, the names "bottom", "top", and "side" represent the positions and directions of the packaging bag 10 and its constituent elements based on the state in which the packaging bag 1 is self-supporting. ..
The gusset of the bottom 23 of the packaging bag 10 is formed, for example, by inserting the bottom film 13 folded in an inverted V shape toward the top between the front film 11 and the back film 12. In FIG. 2, the folding line 13a indicates the folding position of the folded bottom film 13.
The packaging bag 10 is not limited to the above shape, but needs to be a self-standing packaging bag from the viewpoint of causing a problem that rubbing occurs during packaging and transportation.

As shown in FIG. 1, the packaging bag 10 includes a main body portion 14 and an ejection portion 15. The main body portion 14 has a housing portion 14s in which the contents are housed. The accommodating portion 14s is formed between the front surface portion 111 and the back surface portion 112. The dispensing portion 15 is a portion through which the contents pass when the contents to be stored in the main body portion 14 (accommodating portion 14s) of the packaging bag 10 are dispensed. The main body portion 14 and the dispensing portion 15 are integrally configured with each other at least in a portion where they are connected. Specifically, in the portion where the main body portion 14 and the dispensing portion 15 are connected, both the main body portion 14 and the dispensing portion 15 are composed of the front surface film 11 and the back surface film 12. In the first embodiment, the entire pouring portion 15 is composed of the front surface film 11 and the back surface film 12 which are common to the main body portion 14.

As shown in FIG. 1, the main body portion 14 includes an upper portion 21, a pair of side portions 22, and a bottom portion 23.
The upper portion 21 is a portion provided on the upper side (Y1 side) of the packaging bag 10, and has a planned seal portion 21a and an opening portion 21b. The planned seal portion 21a is a portion that is heat-welded after the contents are contained. The opening 21b is a portion that is opened when the contents are stored in the packaging bag 10. The upper portion 21 is sealed by heat-welding the planned seal portion 21a after the contents are accommodated in the accommodating portion 14s through the opening 21b. The packaging bag 10 becomes the packaging bag 1 in which the contents are housed by heat-welding the planned seal portion 21a after the contents are stored in the storage part 14s through the opening 21b. Hereinafter, the heat-welded planned seal portion 21a is also referred to as an “upper seal portion 21a”.

The pair of side portions 22 are portions where the left-right (X-direction) edges of the front surface film 11 and the back surface film 12 are sealed by heat welding at the side seal portions 22a, respectively.
The bottom portion 23 is a portion on the lower side (Y2 side) of the main body portion 14 where the bottom surface film 13 inserted between the front surface film 11 and the back surface film 12 is sealed by the bottom surface sealing portion 23a.

The dispensing portion 15 is located at the upper corner between the upper portion 21 of the main body portion 14 and the side portion 22 on the X2 side. The dispensing section 15 extends along the dispensing direction D1 from which the contents are dispensed. By providing such an ejection portion 15, it is possible to arrange the flow of the contents when the contents are dispensed from the packaging bag 10, and thereby the refilling work of the contents can be easily performed. Note that FIG. 1 shows an example in which the direction in which the dispensing portion 15 extends is inclined with respect to both the direction in which the upper portion 21 and the side portion 22 of the main body portion 14 extend, and the present invention is not limited to this. For example, the direction in which the dispensing portion 15 extends may be parallel to the direction in which the upper portion 21 or the side portion 22 of the main body portion 14 extends.

The dispensing section 15 has an planned opening line 16. The planned opening line 16 is a portion serving as a pouring outlet from which the contents are poured when the pouring seal portion 15a (described later) is opened. The planned opening line 16 is provided with an easy-opening means for facilitating the opening of the packaging bag 10. For example, the planned opening line 16 is provided with an easy-opening line such as a half-cut line formed by laser processing or a cutter. In this case, as shown in FIG. 1, a plurality of easy-opening lines extending substantially parallel to each other may be provided. Further, the stretched film may be included in the laminated film 40 constituting the front surface film 11 and the back surface film 12, and the stretching direction of the stretched film and the extending direction of the planned opening line 16 may be matched. The dispensing portion 15 is provided with a V-shaped notch 17 as another easy-opening means at one end of the planned opening line 16. A display or the like may be formed on or around the planned opening line 16 to indicate to the user that the opening position is reached.

The dispensing portion 15 has a dispensing seal portion 15a on the tip end side. The dispensing seal portion 15a is a portion that the user grips when opening the dispensing portion 15. The dispensed seal portion 15a of the present embodiment is formed in a substantially triangular shape, but the shape of the dispensed seal portion 15a is not particularly limited. The dispensing seal portion 15a is joined to the outside of the planned opening line 16 at the dispensing portion 15. The user can open the dispensing portion 15 by grasping the dispensing seal portion 15a and tearing the planned opening line 16 along the extending direction from the notch 17 as a starting point.

Next, the adhesive member 31 provided on the surface portion 111 of the packaging bag 10 will be described. As shown in FIG. 1, an adhesive member 31 is provided on the surface portion 111 of the packaging bag 1. Further, as shown in FIG. 2, the adhesive member 31 is not provided on the back surface portion 112 of the packaging bag 1. In the packaging bag according to the present invention, it is sufficient that the adhesive member 31 is provided on either the front surface portion 111 or the back surface portion 112, and the adhesive member 31 can be connected to the adjacent packaging bag during packaging and transportation. It becomes.

The adhesive member 31 is a sheet-like member having adhesiveness on both sides. As will be described later, the adhesive member 31 is provided in order to suppress the swinging movement of the packaging bag 1 in a state where a plurality of the adhesive members 31 are housed in the packaging box. As shown in FIG. 2, the accommodating portion 14s of the packaging bag 1 is in a state of being expanded in the thickness direction (vertical direction in the drawing) by accommodating the contents (not shown). The adhesive member 31 is provided on the outer peripheral surface of the most bulging central portion of the accommodating portion 14s in the front surface portion 111 and the back surface portion 112.

Specifically, it is desirable that the adhesive member 31 is provided in a region of 10% or more and 50% or less from the bottom with respect to the total length of the packaging bag 10 in the height direction (Y direction). Further, it is desirable that the adhesive member 31 is provided in a region of 10% or more and 70% or less of the total width including the central portion of the packaging bag 10 in the width direction (X direction). Details of the adhesive member 31 will be described later.

Next, the layer structure of the laminated film 40 will be described.
FIG. 3 is a cross-sectional view of the laminated film 40 used for the packaging bag 10.
As the front surface film 11 and the back surface film 12 constituting the main body portion 14, the laminated film 40 as shown in FIG. 3 can be used. In the laminated film 40, a base material layer 41, a printing layer 42, an adhesive layer 43, and a sealant layer 44 (innermost layer) are laminated in this order from the outermost layer.

As the material constituting the base material layer 41, for example, polyethylene terephthalate, polyamide, polypropylene, paper and the like can be appropriately used. A plurality of base material layers 41 may be provided. As the material constituting the sealant layer 44, for example, polyethylene, polypropylene and the like can be used. Further, the laminated film 40 may include a barrier layer (not shown). The barrier layer is a layer that imparts gas barrier properties to the laminated film 40. As the barrier layer, for example, a metal foil such as an aluminum foil, an inorganic substance such as aluminum, an inorganic oxide such as silicon oxide or aluminum oxide can be used.

As the layer structure of the front surface film 11 and the back surface film 12, for example, the following structure can be exemplified. In the layer structure shown below, "/" represents a boundary between layers when listing the components of the layer. The components of the layer are in the order from the left side to the right side, from the outermost layer to the innermost layer. The numerical value following the material name indicates the layer thickness (μm).
Layer configuration example 1: ON15 / ink / adhesive / LLDPE120
Layer configuration example 2: ON15 / ink / adhesive / aluminum-deposited PET12 / adhesive / LLDPE120
Layer configuration example 3: ON15 / ink / adhesive / transparent vapor deposition PET12 / adhesive / LLDPE100
Layer configuration example 4: Matte varnish / ON15 / ink / adhesive / transparent vapor deposition PET12 / adhesive / LLDPE100
Layer configuration example 5: Transparent thin-film PET12 / ink / adhesive / ON15 / adhesive / LLDPE80

“ON” indicates a biaxially stretched polyamide, and “ink” indicates an ink constituting the printing layer 42 that imparts a design to the laminated film 40. As the ink forming the print layer 42, inks used for various types of printing can be appropriately used. The "adhesive" is an adhesive layer 43 that adheres between the layers. As the adhesive, for example, an adhesive for dry lamination, a thermosetting resin, or the like can be appropriately selected and used according to the manufacturing method of the packaging bag 10.

“Aluminum-deposited PET” and “transparent vapor-deposited PET” are examples of a barrier layer (not shown). In the layer configuration example 5, the transparent vapor-deposited PET is used as the base material layer 41 and the barrier layer. The "matte varnish" is a matte layer provided on the outside of the base material layer 41. "LLDPE" is a linear low density polyethylene and is an example of the sealant layer 44.
The laminated film 40 is not limited to the dry laminating method via the adhesive resin layer as described above, and may be laminated by an extrusion lamination method or a polyethylene sand lamination method.

Next, the configuration, manufacturing method, function, and the like of the adhesive member 31 will be described.
4 (A) to 4 (C) are views for explaining the form of the adhesive sheet 30 when used.
As shown in FIG. 4A, the pressure-sensitive adhesive sheet 30 includes a first peelable base material sheet 32, a pressure-sensitive adhesive member 31, and a second peelable base material sheet 33.

The first peelable base material sheet 32 is a sheet material laminated on one surface of the adhesive member 31. The first peelable base sheet 32 (and the second peelable base sheet 33) is provided in consideration of handleability until the pressure-sensitive adhesive sheet 30 is used, and when the pressure-sensitive adhesive sheet 30 is used, That is, the adhesive member 31 is peeled off when it is attached to each part of the packaging bag 10. As the first releaseable base sheet 32, various forms such as a conventionally known release film, separate paper, separate film, separate paper, release film, and release paper can be appropriately used. For example, high-quality paper, coated paper, impregnated paper, plastic film, or the like having a release layer formed on one side or both sides may be used. The release layer is not particularly limited as long as it is a material having releasability, but for example, silicone resin, organic resin modified silicone resin, fluororesin, aminoalkyd resin, melamine resin, acrylic resin, polyester resin and the like. Can be mentioned. As these resins, any of emulsion type, solvent type and solvent-free type can be used. When a release film provided with a release layer is used, for example, a silicone release type PET (polyethylene terephthalate) film, an untreated PET film, a PP film, a silicone release type paper, or the like can be used.

The thickness of the first peelable base sheet 32 is preferably, for example, 10 μm or more and 100 μm or less, and more preferably 20 μm or more and 60 μm or less. If it is less than the lower limit of the above layer thickness range, there is no stiffness and it becomes difficult to peel off. Further, if the upper limit value of the layer thickness range is exceeded, the stiffness is too strong and the workability at the time of sticking is lowered.
Further, as the first peelable base sheet 32, a commercially available one may be used. For example, a polyester film having a thickness of 38 μm (Mitsui Chemicals Tohcello) in which one side is easily peeled with a silicone-based release agent. Made by Co., Ltd., trade name: SP-PET-01) and the like.
The second peelable base material sheet 33 is a sheet material laminated on the other surface of the adhesive member 31. Since the material, thickness, and the like of the second peelable base sheet 33 are the same as those of the first peelable base sheet 32, the description thereof will be omitted.

The adhesive member 31 has a plurality of concave shapes 31s opened on both sides thereof. Further, the adhesive member 31 has elasticity, and the plurality of concave shapes 31s each act as a fine suction cup to exert an adhesive force (adhesive force).
The adhesive member 31 can be formed by, for example, a liquid resin composition (acrylic emulsion) disclosed in JP-A-2017-36404 by a production method described later. The layer thickness of the pressure-sensitive adhesive sheet 30 is preferably 1 μm or more and 500 μm or less. If it is less than the lower limit of the layer thickness range, it becomes difficult to form the concave shape, or the size of the concave shape becomes too small, and the adhesive (adsorption) property deteriorates. On the other hand, if the upper limit of the layer thickness range is exceeded, the flexibility is lowered, and the workability when joining each part of the packaging bag 10 is deteriorated. In order to evenly provide the concave shapes 31s on both surfaces of the adhesive member 31, it is desirable that the layer thickness t of the adhesive member 31 is in the range of 20 μm ≦ t ≦ 40 μm. This point will be described later.

To attach the adhesive member 31 to each part of the packaging bag 10 (hereinafter, also referred to as “adhesive body 50”) using the adhesive sheet 30 shown in FIG. 4 (A), as shown in FIG. 4 (B). , The second peelable base sheet 33 is peeled from the adhesive sheet 30. Then, as shown in FIG. 4C, the exposed adhesive member 31 is attached to the adherend 50, and an appropriate pressure is applied to the surface thereof. As a result, a large number of concave shapes 31s existing on the exposed surface of the adhesive member 31 are elastically deformed, so that the adhesive member 31 is adsorbed (adhered) to the adherend 50 by the same action as that of the conventional micro suction cup. Become.

That is, due to the elastic deformation around the concave shape 31s, a force that tries to return from the deformed state to the original shape acts on the concave shape 31s. Due to this force, the closed space in the concave shape 31s becomes a negative pressure, and an adsorption action to the adherend 50 occurs. Although the suction force of the concave shape 31s alone is weak, the necessary suction force can be secured as a whole because a large number of concave shapes 31s are formed. Further, when the adhesive member 31 is manufactured, the adhesive force (adhesive force) of the adhesive member 31 can be adjusted by adjusting the amount including the concave shape 31s as a parameter, for example, the density.

After the pressure-sensitive adhesive sheet 30 is attached to the adherend 50, the first peelable base material sheet 32 is further peeled off from the pressure-sensitive adhesive sheet 30. As a result, the surface of the adhesive member 31 opposite to the adherend 50 can be exposed. For example, as shown in FIG. 4C, when the adherend 50 to which the adhesive member 31 is attached is the front surface film 11 and the back surface film 12, the surfaces of the adhesive member 31 exposed to the outside are, for example, a plurality of surfaces. When the packaging bag 1 is housed in a packaging box, it becomes a portion connected to an adhesive member 31 provided in the main body 14 of another adjacent packaging bag 1.

Next, a method for manufacturing the adhesive sheet 30 will be described.
FIG. 5 is a diagram showing a manufacturing apparatus for the adhesive sheet 30.
FIG. 6 is a diagram illustrating a method for manufacturing the adhesive sheet 30.
In order to manufacture the pressure-sensitive adhesive sheet 30, first, the composition of the acrylic emulsion disclosed in JP-A-2017-36404 for forming the pressure-sensitive adhesive member 31 is placed in a stirrer, and nitrogen gas is contained in the composition. The mixture is stirred while mixing to prepare a bubble-containing composition 130 by including bubbles in the composition (P1: whipping step in the figure).
Next, the bubble-containing composition 130 is coated on the second peelable base sheet 33 (P2 in the figure: coating step). In the coating step, for example, a comma coater can be used, but other known coating methods may be used.

After the bubble-containing composition 130 is coated on the second peelable base material sheet 33, the bubble-containing composition 130 is dried while being heated to form the adhesive member 31 (P3 in the figure: drying step). In the drying step, for example, a drying furnace having a temperature of about 60 ° C. to 140 ° C. can be used. As the drying time, for example, about 30 seconds to 10 minutes can be exemplified. Further, in the drying step, drying may be promoted while blowing air on the bubble-containing composition 130. By performing the drying step, concave shapes 31s are formed on both surfaces of the bubble-containing composition 130, and the adhesive member 31 is formed. The concave shape 31s is formed by breaking bubbles contained in the bubble-containing composition 130 and leaving a part of the shape of the bubbles. Here, if the bubbles burst in a state where the bubble-containing composition 130 is insufficiently cured, the concave shape 31s is less likely to remain. On the other hand, if the bubble-containing composition 130 is cured before the bubbles burst, the concave shape 31s may not be formed. Therefore, it is desirable that the drying step is performed under the condition that the foam is broken while the bubble-containing composition 130 is cured to some extent. Therefore, the temperature and the amount of air blown in the drying step have a great influence on the state of the concave shape 31s.

After the pressure-sensitive adhesive member 31 is formed by the drying step, the separately prepared first peelable base material sheet 32 is joined to the pressure-sensitive adhesive member 31 (P4: laminating step in the figure). In this laminating step, since laminating is performed by the adsorption force (adhesive force) of the concave shape 31s of the adhesive member 31, heating is not required, and bonding is possible with only a slight pressing force. Therefore, the first peelable base material sheet 32, which is the surface layer sheet, is not damaged.
When the laminating step is completed, the adhesive sheet 30 is completed.
As described above, in the production of the pressure-sensitive adhesive sheet 30 of the present embodiment, the pressure-sensitive adhesive sheet 30 can be efficiently manufactured without causing damage due to heat when forming the pressure-sensitive adhesive member 31. The adhesive sheet 30 may then be rolled up or cut to a required size.

Next, an example in which the pressure-sensitive adhesive sheet 30 of the present embodiment is actually produced will be shown, and the results of comparison with the comparative example will be described.
In the pressure-sensitive adhesive sheet 30 of the example, the bubble-containing composition 130 which has been foamed using a comma coater having a clearance of 200 μm is placed on a biaxially stretched PET film having releasability on the second peelable base sheet 33. It was applied. This was dried in a drying path at 100 ° C. for 1 minute to form an adhesive member 31, and a surface layer sheet was laminated to obtain an adhesive sheet 30. The density of the adhesive member 31 in this case was 0.39 g / cm ³ , and the thickness was 50 μm.
FIG. 7 is an enlarged photograph of the adhesive member 31 of the adhesive sheet 30 of the embodiment as viewed from the direction of the adherend.
FIG. 8 is an enlarged view in a cross section in a direction orthogonal to the sheet surface of the adhesive member 31 of the adhesive sheet 30 of the embodiment.
As shown in FIGS. 7 and 8, it can be confirmed that a large number of concave shapes 31s are formed on the adhesive member 31.

As Comparative Example 1, an adhesive sheet produced in the same manner as in the above-mentioned Example was produced except that the whipping step was not performed. The density of the adhesive layer after preparation was 0.87 g / cm ³ , and the thickness was 100 μm.
As Comparative Example 2, an adhesive sheet (referred to as acrylic adhesive A type) having an adhesive layer prepared using SK2094 manufactured by Soken Chemical Co., Ltd., which is an acrylic resin, was prepared.
As Comparative Example 3, an adhesive sheet (referred to as acrylic adhesive B type) having an adhesive layer prepared using SK1502C manufactured by Soken Chemical Co., Ltd., which is an acrylic resin, was prepared.

The above four types of adhesive sheets were prepared and the peeling force was compared.
FIG. 9 is a diagram showing peeling force of Examples and Comparative Examples.
The peeling force in FIG. 9 is the result of measuring the peeling force at that time by performing 180 ° peeling at a tensile speed of 300 mm / min using a tensile tester. The peeling force was measured immediately after pasting (0 hours) and 1000 hours after pasting.

In the examples, it can be seen that the peeling force can be relatively small both immediately after the sticking and after 1000 hours have passed. With such a peeling force, it does not peel off naturally, and it can be easily peeled off by applying force to peel it off. Moreover, since the adsorption is performed by the concave shape 31s, the adhesive member 31 does not remain on the surface of the adherend 50 after peeling, and the adhesive force (peeling force) of the adhesive member 31 itself does not substantially change. It was possible to paste.

In Comparative Example 1, small pieces can be peeled off with a relatively small peeling force, but in the case of a large size, a certain amount of force is required for peeling. In addition, after peeling, the adhesive layer remained on the surface of the adherend, and complete reattachment was impossible.
In Comparative Example 2, in the case of a large size, a certain amount of force is required for peeling, and it is possible to peel off immediately after pasting, but after 1000 hours, the peeling force has increased significantly. Therefore, it was difficult to peel it off manually, and if it was forcibly peeled off, the surface layer sheet might be damaged.
In Comparative Example 3, the peeling force was too large immediately after the sticking, and it was difficult to peel the sheet manually, or the surface layer sheet might be damaged if the peeling force was forcibly peeled.
Further, neither of Comparative Example 2 and Comparative Example 3 was suitable for reattachment because a part of the adhesive material remained on the adherend and the adhesive strength was lowered after the peeling. ..

(Verification experiment on concave shape 31s of adhesive member 31)
As described above, the concave shape 31s of the adhesive member 31 has a great influence on the adhesive force. If the concave shapes 31s are not evenly provided on both surfaces of the adhesive member 31, the adhesive force (adhesive force) of one surface of the adhesive layer may decrease or increase as compared with the other surface. Further, since the concave shape 31s is evenly provided on both surfaces of the adhesive member 31, the physical properties of the adhesive member 31 become homogeneous, and the first and second peelable base sheet or the first peelable base sheet can be used. It is also preferable in terms of exhibiting sufficient adhesive strength to both the adherend and removability with the adherend.

In order to evenly provide the concave shape 31s on both surfaces of the adhesive member 31, it is important to control the coating amount (layer thickness t) of the adhesive member 31. In this regard, Japanese Patent Application Laid-Open No. 2017-36404 does not consider anything, and it is sufficient that a micro suction cup is simply formed. In JP-A-2017-36404, it is shown as a surface having a micro suction cup in FIG. 2 (FIG. 2 of JP-A-2017-36404) which is a cross-sectional photograph of Example 1 formed with a WET film thickness of 800 μm. Although a fine suction cup structure is formed in the part, the part shown as a surface peeled off from the glass substrate has a structure that seems to be a huge bubble that is incomparable to the previous fine suction cup structure. You can check it. That is, in the configuration of JP-A-2017-36404, a micro suction cup (corresponding to the concave shape 31s in the present embodiment) is formed on one surface of the adhesive layer, but a micro suction cup (corresponding to the concave shape 31s in the present embodiment) is formed on the other surface. The concave shape 31s) is not substantially formed.

This point was also verified by the applicant.
As a verification experiment, samples of four types of adhesive layers were prepared, and the concave shapes 31s on both sides were observed by SEM. The samples are the following four types.
Sample 1: Adhesive layer thickness t = 25 μm
Sample 2: Adhesive layer thickness t = 30 μm
Sample 3: Adhesive layer thickness t = 35 μm
Sample 4: Adhesive layer thickness t≈2000 μm
The layer thickness of the sample is the layer thickness after drying. Further, for Samples 1 to 3, the glass surface was coated with the bubble-containing composition after the foaming treatment using a coater, and the drying treatment was carried out using a drying oven at 100 degrees. Sample 4 was drip-coated on a glass surface and naturally dried at room temperature. The drying conditions of Sample 4 were changed in order to verify the description in JP-A-2017-36404 that drying at room temperature is sufficient. In each sample, the density of the adhesive layer after the foaming treatment was 0.4 g / cm ³ .

10 (A) and 10 (B) are diagrams showing the observation results of Sample 1.
11 (A) and 11 (B) are diagrams showing the observation results of Sample 2.
12 (A) and 12 (B) are diagrams showing the observation results of Sample 3.
13 (A) and 13 (B) are views showing the observation results of Sample 4.
As shown in FIGS. 10 to 13, it was confirmed that the fine concave shapes 31s were uniformly formed on both sides of the samples 1 to 3 in which the layer thickness t of the adhesive layer was controlled.
On the other hand, in the thick sample 4 shown in FIG. 13, an extreme difference in the size of the concave shape 31s was observed between the dry surface and the glass side surface, which was the same as in FIG. 2 of JP-A-2017-36404. The result was obtained.
Therefore, in order to evenly provide the concave shapes 31s on both surfaces of the adhesive member 31, it can be determined that the layer thickness t of the adhesive member 31 is preferably in the range of 20 μm ≦ t ≦ 40 μm.

Here, regarding the state in which the concave shape 31s is evenly provided on both surfaces of the adhesive member 31, it is desirable to satisfy the following relationship in more detail.
The average value of the diameters of the openings of the concave 31s that open on the surface on the surface sheet (first sheet) side is set to ^Dave _1, and each of the concave 31s that opens on the peelable base sheet (second sheet) side. When the average value of the diameter of the opening is ^Dave ₂ ,
| D ^ave _1- D ^ave ₂ | / D ^ave ₂ ≤ 0.5
It is desirable to satisfy the relationship of.
Also,
| D ^ave _1- D ^ave ₂ | / D ^ave ₂ ≤ 0.25
It is more desirable to satisfy the relationship of.

By satisfying these relationships, the difference in adhesive strength on both sides of the adhesive member 31 can be reduced, and the first and second peelable base sheet or the first peelable base sheet and the adherend can be used. Sufficient adhesive strength to both of the above and removability from the adherend can be satisfactorily exhibited.
Since it is practically impossible to obtain the average value of the diameters of all the openings as the average value of the diameters of the openings, here, the openings having a large diameter within the observation range of 1500 μm × 1100 μm. The diameters of the three openings were measured in order from the beginning, and the average value was used.
Here, the openings of the samples of FIGS. 10 to 13 were measured, and | D ^ave _1- D ^ave ₂ | / D ^ave ₂ was obtained. As a result, sample 1: 0.04 and sample 2: 0.06. , Sample 3: 0.12, Sample 4: 0.69.
By using the adhesive member 31 having the above-described configuration, the packaging bag 1 of the first embodiment has a configuration that suppresses the shaking movement when it is housed in the packaging box.

The adherend 50 (see FIG. 5C) is characterized in that the exposed adhesive surface has low tackiness according to a ball tack test conforming to JIS Z 0237. The adhesive member in the present invention exhibits a suction cup adhesive function derived from having a large number of concave shapes. Therefore, the adhesiveness derived from the material of the adhesive member is relatively small, and the tackiness is lower than that of a normal adhesive member having no concave shape. For this reason, even in a usage mode in which the adhesive surface is exposed on the outermost surface of the packaging bag, it is possible to exhibit sufficient adhesiveness when adhering to the adhesive surface while preventing stickiness of the adhesive surface. It is possible, which provides effective non-slip properties. Therefore, it can be suitably used in a mode in which the adhesive surface is exposed as in the present invention.

As described above, the adhesiveness of the adhesive member 31 can be adjusted depending on the conditions for forming the opening. Then, by changing the formation state of the opening of the adhesive member 31, two types of adhesive members 31 (classified as Type A and Type B) shown below can be produced as a method of expressing the adhesive action.
Type A: An adhesive member in which adhesive strength is exhibited by a suction cup action, and the adhesive strength of the adhesive itself also contributes to the adhesive strength. In this Type A adhesive member, the adhesiveness of the adhesive itself causes a slight "sticky" feel.
Type B: An adhesive member in which the adhesive force is developed by a sucking action, but the adhesive force of the adhesive itself does not contribute to the adhesive force or the adhesive force of the adhesive itself is not exhibited. In this Type B adhesive member, the adhesiveness of the adhesive itself does not act as an adhesive force, so that a "sticky" tactile sensation does not occur.

An inclined ball tack test (JIS Z 0237), which is an adhesive test effective for evaluating the above-mentioned "stickiness", was carried out on the above two types of adhesive members. The outline of the inclined ball tack test is as follows.
First, a test piece obtained by cutting the obtained adhesive member into a width of 25 mm and a length of 100 mm was prepared. Next, the test piece was set on a ball tack tester (manufactured by Tester Sangyo Co., Ltd.) so that the adhesive surface was the surface (the inclination angle of the adhesive surface was 30 °). Further, in an atmosphere of 23 ° C., the steel ball is rolled so as to pass through the measurement surface region of the adhesive surface of the test piece set in the ball tack tester (the length of the measurement surface is 100 mm). At this time, a steel ball having a diameter of 1/32 inch to 1 inch was used. Then, among the steel balls that stop in the region of the measurement surface when these steel balls are rolled, the value of the ball number having the maximum diameter is specified. The ball number is obtained by multiplying the diameter of the steel ball by 32. Each numerical value of the ball tack test below indicates the value of the ball number.

The results of the inclined ball tack test for the adhesive member 31 of the present embodiment are shown below.
Type A: 9 (ball No. 9)
Type B: Since the adhesive itself is not sticky, the ball No. All balls of 1 or more roll down. That is, the evaluation of ball tack is less than 1.
Since there are various forms of use as an adhesive member, it is not possible to simply give superiority or inferiority to Type A and Type B, and it is preferable to appropriately select them according to the form of use. Regarding Type A, considering the convenience of re-peeling and re-sticking, the ball tack test results are preferably 5 to 10, more preferably 6 to 9, and even more preferably 7 to 8.
In the present embodiment, since a “sticky” feel is not desirable, it is desirable to use Type B as the adhesive member 31.

Next, the operation and effect when a plurality of the above-mentioned packaging bags 1 are housed in the packaging box will be described.
FIG. 14 is a conceptual diagram showing a state in which a plurality of packaging bags 1 are housed in a packaging box 60. FIG. 14 shows a state in which a plurality of packaging bags 1 are arranged in a row. However, when a plurality of packaging bags 1 are transported, a plurality of rows are actually accommodated in one box 60. To. As shown in FIG. 14, the plurality of packaging bags 1 are housed in the packaging box 60 so that the main bodies 14 face each other in a self-supporting state.

When a plurality of packaging bags (self-supporting packaging bags) 1 containing the contents are arranged as shown in FIG. 14, the adhesive member 31 provided on the surface portion 111 of the main body portion 14 of the packaging bag 1 is adjacent to another packaging. The main body portion 14 of the bag 1 is bonded to the back surface portion 112 on which the adhesive member 31 is not provided with an appropriate adhesive force. As a result, the plurality of packaging bags 1 become a self-supporting packaging bag set 100 connected to each other by the adhesive member 31. In the self-supporting packaging bag set 100, since the adjacent packaging bags 1 are connected to each other by the adhesive member 31, the swinging movement of the plurality of packaging bags 1 can be suppressed.

Further, when taking out from the packing form of FIG. 14, due to the appropriate adhesive force of the adhesive member 31, it can be taken out as it is in a state where any plurality of packaging bags are connected, and can be displayed as it is. This has the effect of saving the trouble of displaying, and has an unprecedented effect of suppressing the careless drop of each packaging bag from the product shelf. Furthermore, by displaying the products in this connected state, the purchaser can peel off the connected packaging bags with a relatively small peeling force, so that it does not interfere with the purchase, and conversely, a plurality of packaging bags can be peeled off. When purchasing, the required number of items can be peeled off from the display shelves in the connected state, which makes the display form extremely convenient for the purchaser.

Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and various modifications and changes can be made as in the modified forms described later, and these are also disclosed in the present disclosure. Included within the technical scope of. Moreover, the effects described in the embodiments are merely a list of the most suitable effects resulting from the present disclosure, and are not limited to those described in the embodiments. The above-described embodiment and the modified form described later may be used in combination as appropriate, but detailed description thereof will be omitted.

(Transformed form)
In the packaging bag 10, the adhesive member 31 may be provided on both the front surface portion 111 and the back surface portion 112 of the main body portion 14. In this case, in FIG. 14, the packaging bag 1 located at both ends of the row (right end and left end in the drawing) has an adhesive member 31 provided on a side not in contact with another adjacent packaging bag 1 on the wall surface of the box 60. Since it is connected to 61, it is possible to prevent the entire self-supporting packaging bag set 100 and each packaging bag 1 from swinging inside the box 60. Further, regardless of which direction the front surface portion 111 and the back surface portion 112 of the main body portion 14 are accommodated, the adhesive members 31 can be connected to each other. In this case, the adhesive member 31 may have different thicknesses, adhesive strengths, etc. between the front surface portion 111 and the back surface portion 112.
The shape of the adhesive member 31 is not limited to the elliptical shape as shown in FIG. 1, and may be, for example, a circular shape, a quadrangular shape, or the like.
The adhesive member 31 may be divided into a plurality of parts. For example, the small circular adhesive member 31 may be arranged in a dot shape, or the narrow strip-shaped adhesive member 31 may be arranged in a stripe shape.

1, 10 Packaging bag 11 Front surface film 12 Back surface film 14 Main body 14s Storage section 15 Outlet section 15a Outlet seal section 16 Scheduled opening line 21 Upper 21a Scheduled seal section (upper seal section)
22 Side part 22a Side seal part 23 Bottom part 23a Bottom seal part 31 Adhesive member 31s Concave shape 40 Laminated film 100 Free-standing packaging bag set 111 Front surface 112 Back surface

Claims (4)

It is composed of a laminated film having at least a base material layer and a sealant layer.
An accommodating portion having at least a front surface portion and a back surface portion and capable of accommodating the contents between the front surface portion and the back surface portion, a seal portion formed around the accommodating portion, and a periphery of the accommodating portion. It is a self-standing packaging bag equipped with a planned seal part provided as needed.
An adhesive member is provided on a part of at least one surface of the front surface portion and the back surface portion constituting the housing portion.
The adhesive member has a plurality of concave shapes evenly formed on both sides thereof.
The average value of the diameters of the concave openings opened in the first surface is set to ^Dave _1, and the concave openings opened in the second surface opposite to the first surface. When the average value of the diameter is ^Dave ₂ ,
| D ^ave _1- D ^ave ₂ | / D ^ave ₂ ≤ 0.5
Self-supporting packaging bag that meets the relationship. The self-supporting packaging bag according to claim 1.
The adhesive member is a self-supporting packaging bag provided at least in a region of 10% or more and 50% or less from the bottom with respect to the total length in the height direction of the self-supporting packaging bag. The self-supporting packaging bag according to claim 1 or 2.
The self-supporting packaging bag includes the center of the self-supporting packaging bag in the width direction, and is provided at least in a region of 10% or more and 70% of the total width. A self-supporting packaging bag set including a plurality of self-supporting packaging bags according to any one of claims 1 to 3, which contains the contents.
A self-supporting packaging bag set in which the plurality of self-supporting packaging bags are connected via the adhesive member.