JP2021020729A - Packaging bag - Google Patents

Abstract

To provide a packaging bag capable of imparting more excellent slip resistance than conventional ones.SOLUTION: A packaging bag 10 is composed of laminate films, includes a storage part, a seal part, a seal planned part and a spouting part, in the spouting part, the laminate films are oppositely arranged with a sealant layer inside, a spouting seal part 15a is formed in the periphery, the laminate films constituting the spouting part 15 is formed with an opening planned line 16, an adhesive member 31d is provided in at least a region closer to the spouting seal part 15a side than the opening planned line 16 on the outer surface of the laminate film, and the adhesive member 31d has a plurality of predetermined recess shapes equally formed on both surfaces thereof.SELECTED DRAWING: Figure 1

Description

The present invention relates to a packaging bag including a dispensing section.

For detergents, lotions, etc., refillable packaging containing the same contents is sold in order to use the main container repeatedly. In this type of packaging, in order to facilitate opening, the planned opening line of the packaging bag containing the contents is subjected to an easy opening process such as a half-cut line.

In such a packaging bag, the portion gripped by the user at the time of opening is small and slippery. In particular, when the contents such as detergent adhere to the surface of the packaging bag, it is very slippery and the opening itself becomes difficult. For this reason, a laminate has been proposed in which a non-slip layer is formed by applying a matting agent composed of inorganic particles to a portion gripped by the user when the packaging bag is opened (see, for example, Patent Document 1). ..

JP-A-2017-154459

However, even in the above-mentioned conventional technique, the anti-slip property is still insufficient, and further improvement of the anti-slip property is required.

An object of the present invention is to provide a packaging bag capable of imparting superior anti-slip property to conventional ones.

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 is provided around an accommodating portion (14s) capable of accommodating the contents and around the accommodating portion. A package including a sealing portion (21a, 22a, 23a) to be formed, a planned sealing portion provided around the accommodating portion as needed, and an dispensing portion (15) capable of pouring out the contents. In the bag, the laminated film is arranged so as to face each other with the sealant layer inside, and an injection seal portion (15a) is formed around the laminated film, which constitutes the injection portion. A scheduled opening line (16) is formed on the laminated film, and is adhered to at least a region on the side of the pouring seal portion from the scheduled opening line on the outer surface of the laminated film constituting the pouring portion. A member (31d) is provided, and the adhesive member has a plurality of concave shapes (31s) uniformly formed on both sides thereof, and each of the concave openings opened on the first surface. When the average value of the diameters is ^Dave ₁ and the average value of the diameters of the concave openings opened on the second surface opposite to the first surface is ^Dave ₂ , | D ^A packaging bag (10) satisfying the relationship of ^ave ₁ − D ^ave ₂ | / D ^ave ₂ ≦ 0.5.

The second invention is a packaging bag according to the first invention, in which the adhesive members (31a to 31c) are further provided at at least one of the sealing portions formed around the accommodating portion. It is a bag.

The third invention is a packaging bag according to the first or second invention, which is configured to be self-supporting in a state in which the contents are contained.

According to the present invention, it is possible to provide a packaging bag to which a non-slip property is imparted to be superior to the conventional one.

It is a front view which shows the packaging bag 1 of 1st Embodiment. It is a front view which shows the basic structure excluding the adhesive member 31 in the packaging bag 1 of 1st Embodiment. (A) is a cross-sectional view taken along the line s1-s1 shown in FIG. (B) is a cross-sectional view taken along the line s2-s2 shown in FIG. (C) is a sectional view taken along line s3-s3 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. It is a top view which shows the packaging bag 1A of the 2nd Embodiment.

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".

(First Embodiment)
FIG. 1 is a front view showing the packaging bag 1 of the first embodiment. FIG. 2 is a front view showing a basic configuration of the packaging bag 10 of the first embodiment excluding the adhesive member 31. FIG. 3A is a cross-sectional view taken along the line s1-s1 shown in FIG. FIG. 3B is a cross-sectional view taken along the line s2-s2 shown in FIG. FIG. 3C is a cross-sectional view taken along the line s3-s3 shown in FIG. In FIGS. 3A to 3C, the cross section of the adhesive member 31 (described later) is shown by a thick black line.

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).

The packaging bag 1 shown in FIG. 1 has adhesive members 31a to 31d (hereinafter, also collectively referred to as “adhesive member 31”) on the outer surface of each of the sealing portions, which will be described later, in a state where the contents are contained in the accommodating portion 14s. Is provided.

(Basic configuration of packaging bag)
First, using the packaging bag 10 of FIG. 2, the basic configuration of the packaging bag 1 before the adhesive member 31 is provided will be described. The packaging bag 10 of FIG. 2 has the same configuration as the packaging bag 1 except that the adhesive member 31 is not provided. The packaging bag 10 is, for example, a packaging bag for storing contents such as liquid detergent and lotion, which are refilled in a main body container such as a bottle. The packaging bag 10 includes a front surface film 11, a back surface film 12, and a bottom surface film 13 as main parts, and is configured as a self-supporting container (standing pouch) as a whole.

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. 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. 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. The components on the front side and the components on the back side of the packaging bag 10 are substantially the same. In the following description, the shape on the front surface side will be mainly described, and the description on the shape on the back surface side will be omitted as appropriate.

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 according to the present invention is not limited to the above-mentioned packaging bag 10. For example, it may be a so-called three-way seal bag in which a seal portion obtained by heat welding a film is formed along three side sides. Further, it may be a so-called four-way seal bag in which the seal portion obtained by heat welding the film is formed on the four side sides.

The packaging bag 10 includes a main body portion 14 and an ejection portion 15. The main body portion 14 is a portion having a housing portion 14s in which the contents are housed. The dispensing portion 15 is a portion through which the contents pass when the contents to be contained in the main body portion 14 (accommodating portion 14s) of the packaging bag 1 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 this 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. Although not shown, in the pouring portion 15, the laminated film 40 is arranged facing each other with the sealant layer (described later) inside. A dispensing seal portion 15a (described later) is formed around the dispensing portion 15.

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. The packaging bag 10 has a planned seal portion 21a and an opening portion 21b when the contents are not contained. 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”. Adhesive members 31a (described later) are provided on the front side and the back side of the 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. In the main body 14, adhesive members 31b and 31c (described later) are provided on the front side and the back side of the left and right side seal portions 22a.
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 1, and thereby the refilling work of the contents can be easily performed. Note that FIG. 2 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 1. 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. 2, 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 (described later) 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. In the dispensing portion 15, adhesive members 31d (described later) are provided on the outer surfaces of the front side and the back side of the dispensing seal portion 15a, respectively. The packaging bag according to the present invention may be provided with a separate dispensing member in the dispensing section 15. Further, the dispensing portion 15 may be a corner portion of a three-way seal bag or a four-way seal bag as long as there is an planned opening line 16.

Next, the layer structure of the laminated film 40 will be described.
FIG. 4 is a cross-sectional view of the laminated film 40 used for the packaging bag 10.
A laminated film 40 can be used as the front surface film 11 and the back surface film 12 constituting the main body portion 14. As shown in FIG. 4, 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.

(First Embodiment)
Next, the configuration of the first embodiment in which the adhesive member 31 is provided in each part of the packaging bag 10 will be described with reference to FIG.
As shown in FIG. 1, in the packaging bag 1, adhesive members 31a to 31d are provided on the upper portion 21, the left and right side portions 22, and the dispensing portion 15 of the main body portion 14, respectively. The adhesive member 31 is a sheet-like member having adhesiveness on both sides. The adhesive member 31 is provided in the packaging bag 1 in order to impart anti-slip properties to a portion gripped by the user.

As shown in FIG. 3C, the injection portion 15 is provided with adhesive members 31d on the outer surfaces of the front side and the back side of the injection seal portion 15a to which the front surface film 11 and the back surface film 12 are joined, respectively. Has been done. The dispensing seal portion 15a is a portion gripped by the user when the dispensing portion 15 is opened. As shown in FIG. 1, the adhesive member 31d is provided so as to cover substantially the entire surface of the dispensing portion 15 except for the planned opening line 16.

As shown in FIG. 3A, the upper portion 21 of the main body portion 14 has adhesive members 31a on the outer surfaces of the front side and the back side of the upper sealing portion 21a to which the front surface film 11 and the back surface film 12 are joined. It is provided. The upper seal portion 21a is a portion gripped by the user when the contents contained in the packaging bag 1 are refilled in the main body container or when the dispensing portion 15 is opened. As shown in FIG. 1, the adhesive member 31a is provided so as to cover a part of the upper seal portion 21a, but the present invention is not limited to this, and the adhesive member 31a may be provided on the entire surface.

As shown in FIG. 3B, the side portion 22 of the main body portion 14 has the front side and the back side of the side seal portion 22a to which the front surface film 11 and the back surface film 12 are joined on the X1 side of the main body portion 14. Adhesive members 31b are provided on the outer surface of each of the above. Further, on the X2 side of the main body portion 14, adhesive members 31c are provided on the outer surfaces of the front side and the back side of the side sealing portion 22a to which the front surface film 11 and the back surface film 12 are joined, respectively. The side seal portion 22a is a portion that the user grips when refilling the contents contained in the packaging bag 1 into the main body container. As shown in FIG. 1, the adhesive members 31b and 31c are provided so as to cover a part of the respective side seal portions 22a, but the present invention is not limited to this, and the adhesive members 31b and 31c may be provided on all of them.

Next, the configuration, manufacturing method, function, and the like of the adhesive member 31 will be described.
5 (A) to 5 (C) are views for explaining the form of the adhesive sheet 30 when used.
As shown in FIG. 5A, 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. 5 (A), as shown in FIG. 5 (B). , The second peelable base sheet 33 is peeled from the adhesive sheet 30. Then, as shown in FIG. 5C, 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. 3C, when the adherend 50 to which the adhesive member 31d is attached is the front surface film 11 and the back surface film 12, the surface of the adhesive member 31d exposed to the outside has the injection portion 15. It is the part that the user grips when opening the package.

Next, a method for manufacturing the adhesive sheet 30 will be described.
FIG. 6 is a diagram showing a manufacturing apparatus for the adhesive sheet 30.
FIG. 7 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. 8 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. 9 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. 8 and 9, 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. 10 is a diagram showing peeling force of Examples and Comparative Examples.
The peeling force in FIG. 10 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 .

11 (A) and 11 (B) are diagrams showing the observation results of Sample 1.
12 (A) and 12 (B) are diagrams showing the observation results of Sample 2.
13 (A) and 13 (B) are diagrams showing the observation results of Sample 3.
14 (A) and 14 (B) are diagrams showing the observation results of Sample 4.
As shown in FIGS. 11 to 14, it was confirmed that the fine concave shapes 31s were uniformly formed on both surfaces of 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. 14, 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. 11 to 14 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 structure in which each part has a non-slip property.

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.

In the packaging bag 1 of the first embodiment described above, the adhesive members 31 (31a to 31d) provided on the portion gripped by the user exert an appropriate adhesive force against the fingertips of the user and the like. Therefore, when the user grips the dispensing seal portion 15a and opens the dispensing portion 15, it is possible to suppress a problem that the fingertip slips on the surface of the dispensing seal portion 15a and it becomes difficult to tear the planned opening line 16. Further, when the user refills the main body container with the contents while holding the upper seal portion 21a and the side seal portion 22a, the problem that the fingertip slips on the surface of the seal portion and it becomes difficult to hold the packaging bag 1 is suppressed. it can. Further, since the fingertip can be separated from the adhesive member 31 with a relatively small peeling force, not only the fingertip becomes less slippery, but also the problem that the fingertip sticks to the adhesive member 31 can be suppressed. Therefore, according to the packaging bag 1 of the first embodiment, it is possible to impart a more excellent anti-slip property to the portion gripped by the user.
Further, in the packaging bag 1 of the first embodiment, adhesive members 31d are provided on the outer surfaces of the front side and the back side of the injection seal portion 15a, respectively. Therefore, when the dispensing portion 15 is opened, the fingertips of the user can be made less slippery on the surface of the dispensing seal portion 15a.

(Second Embodiment)
The packaging bag 1A of the second embodiment is different from the first embodiment in that it further includes the adhesive members 31e in addition to the adhesive members 31a to 31d. In the packaging bag 1A of the second embodiment, other configurations are the same as those of the first embodiment. Therefore, in the description and drawings of the second embodiment, members and the like equivalent to those of the first embodiment are designated by the same reference numerals as those of the first embodiment, and duplicate description will be omitted.

FIG. 15 is a front view showing the packaging bag 1A of the second embodiment. As shown in FIG. 15, the packaging bag 1A of the second embodiment is provided with an adhesive member 31e on a portion opposite to the ejection sealing portion 15a with the planned opening line 16 interposed therebetween. Although not shown, the adhesive member 31e is provided on the outer surfaces of the front side and the back side of the main body portion 14 on the opposite sides of the planned opening line 16 from the injection seal portion 15a, respectively. ..

According to the packaging bag 1A of the second embodiment, when the dispensing portion 15 is opened, the dispensing seal portion 15a is held by the fingertips of the other hand while grasping the portion of the adhesive member 31e with the fingertips of one hand. It can be grasped and the planned opening line 16 can be torn. According to this, when the dispensing seal portion 15a is gripped and the planned opening line 16 is torn, the packaging bag 1A can be kept in a more stable state, so that the planned opening line 16 can be torn more easily and reliably. Can be done.

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 first and second embodiments, the adhesive member 31 may be provided at least on the injection seal portion 15a. The upper seal portion 21a, the side seal portion 22a, and the like can be appropriately provided according to the shape, usage pattern, and the like of the packaging bag 1.
In the first and second embodiments, the adhesive member 31 may be provided on either the front surface or the back surface of each portion. Further, in one packaging bag 1, even if a portion where the adhesive member 31 is provided on the outer surface on the front side and the back side and a portion provided on the outer surface on either the front side or the back side are mixed. Good.

In the first and second embodiments, the adhesive members 31 provided on the upper seal portion 21a, the side seal portion 22a, and the like may be provided intermittently at predetermined intervals. Further, the adhesive member 31 may be provided in the entire outer peripheral region of the main body portion 14.
In the first and second embodiments, the adhesive member 31 may have any shape, size, etc. as long as it can be grasped by the user.
In the first and second embodiments, the pressure-sensitive adhesive member 31 may have a different thickness, adhesive strength, and the like depending on the portion to be provided.

1, 1A, 10 Packaging bag 11 Front surface film 12 Back surface film 14 Main body 14s Storage part 15 Delivery part 15a Note sealing part 16 Scheduled opening line 21 Upper part 21a Scheduled sealing part (upper sealing part)
22 Side part 22a Side seal part 23 Bottom part 23a Bottom seal part 31a to 31e Adhesive member

Claims (3)

It is composed of a laminated film having at least a base material layer and a sealant layer.
An accommodating portion capable of accommodating the contents, a seal portion formed around the accommodating portion, a planned seal portion provided around the accommodating portion as needed, and a pouring portion capable of pouring out the contents. It is a packaging bag that has a part and
In the pouring portion, the laminated film is arranged so as to face each other with the sealant layer inside, and a pouring seal portion is formed around the laminated film.
An planned opening line is formed on the laminated film constituting the pouring portion.
An adhesive member is provided on the outer surface of the laminated film constituting the pouring portion, at least in a region on the pouring seal portion side from the planned opening line.
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
Packaging bag that meets the relationship. The packaging bag according to claim 1.
A packaging bag in which the adhesive member is further provided at at least one of the seal portions formed around the accommodating portion. The packaging bag according to claim 1 or 2.
A packaging bag that is configured to be self-supporting with its contents contained.