JP7384024B2 - packaging bag - Google Patents

Description

The present invention relates to a packaging bag containing contents.

Conventionally, various packaging bags containing foods and the like have been developed (for example, see Patent Document 1).
Generally, packaging bags containing snack foods and the like are made of a resin packaging material consisting of multiple layers, are flexible, and are difficult to stand on their own. Therefore, in the above-mentioned Patent Document 1, in a gusset-type packaging bag or the like, the seal portion on the side that becomes the bottom is adhered to the bottom to improve the stability of the bottom.

Japanese Patent Application Publication No. 7-59520

However, there has been a demand for flat packaging bags that do not have a width section to be able to stand on their own when eating or the like. The invention of Patent Document 1 mentioned above relates to a gusset-type packaging bag, and Patent Document 1 does not disclose any method for making such a flat bag-type packaging bag self-supporting.

An object of the present invention is to provide a packaging bag whose bottom can be easily formed and which can stand on its own.

The present invention solves the above problems by the following solving means. Note that, 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.
A first aspect of the present invention includes a first surface portion (15) having a rectangular shape and a second surface portion (16) having a rectangular shape opposite to the first surface portion, the first surface portion and the second surface portion having a rectangular shape. A packaging bag in which a storage part (17) for accommodating contents is formed between the faces of the packaging bag, wherein the first face and the second face have at least a paper base layer (31) and a sealant layer ( 32), the first surface portion and the second surface portion are connected to each other on at least one side, and the edges of the other sides are joined by the sealant layer. and a folding line part (20) is provided at a position corresponding to the accommodating part on the outer surface of the first surface part and the second surface part, and the folding line part (20) is arranged at least on the first surface part. a first mountain-fold planned line (21a) that is provided and extends in a predetermined dimension from the first corner (t1) of the storage portion toward the center of the rectangular shape of the first surface portion in an oblique direction; A second mountain folding planned line (21b) provided at a position corresponding to the first mountain folding planned line of the second surface portion, and a second mountain folding planned line (21b) provided on the first surface portion and corresponding to the first mountain folding planned line of the accommodating portion. A predetermined diagonal direction toward the center side of the rectangular shape of the first surface portion from a second corner portion (t6) opposite to the corner portion of and the first side (13A) which is one side of the rectangular shape. a third planned mountain fold line (21c) extending with a dimension of , and a fourth planned mountain fold line (21d) provided at a position corresponding to the third planned mountain fold line of the second surface portion; The line is provided on the first surface and intersects the first side of the first surface from an end point (t2) of the first planned mountain fold line opposite to the first corner. A first planned valley fold line (22a) provided between the third side (11) located on the first corner side and the first planned valley fold line of the second surface section. a second valley-fold planned line (22b) provided at a corresponding position; and an end point (22b) provided on the first surface portion opposite to the second corner of the third mountain-fold planned line ( t7) to a fourth side (12) that intersects the first side of the first surface and is located on the second corner side ( 22c), and a fourth valley-fold planned line (22d) provided at a position corresponding to the third valley-fold planned line of the second surface part, This is a packaging bag (10) in which a bottom part (19) that allows the packaging bag to stand on its own is formed by folding the laminate.

In a second aspect of the present invention, the folding line portion (20) is further provided on the first surface portion (15), and is arranged between the first mountain folding line (21a) and the first valley folding line. (22a), along the first side (13A) to the intersection (22c) of the third planned mountain fold line (21c) and the third planned valley fold line (22c). a fifth planned mountain fold line (24a) provided up to t7), and a sixth planned mountain fold line provided at a position corresponding to the fifth planned mountain fold line of the second surface portion (16). (24b) The packaging bag (10) of the first invention comprises: (24b).

In a third invention, the folding line part (20) is further provided on the first surface part (15), and the first mountain folding line (21a) and the first valley folding line are arranged on the first plane part (15). A seventh mountain fold extending from the intersection (t2) with (22a) along the extending direction of the third side (11) toward the second side (13B) opposite to the first side a planned line (25a), an eighth planned mountain fold line (25b) provided at a position corresponding to the seventh planned mountain fold line of the second surface section (16), and the first planar surface section. from the intersection (t7) of the third planned mountain fold line (21c) and the third planned valley fold line (22c) along the extending direction of the fourth side (12). A ninth planned mountain fold line (25c) extending toward the second side and a tenth planned mountain fold line (25d) provided at a position corresponding to the ninth planned mountain fold line on the second surface. ), and is a packaging bag (10) of the first invention or the second invention.

A fourth invention is the first to third invention, wherein the planned folding line portion (20) is formed by at least one of printing, crease rules, and perforations provided in at least the paper base layer. This is any one of the packaging bags (10) up to the invention.

A fifth invention is the packaging bag (10) according to any one of the first invention to the fourth invention, which is provided with a display section on the outer surface that displays the folding method of the folding planned line section.

In a sixth aspect of the present invention, an unsealing portion (18) is provided near a second side (13B) opposite to the first side (13A) along an extending direction of the second side. This is a packaging bag (10) according to any one of the first to fifth inventions.

A seventh aspect of the invention is that the first corner (t1) and the second corner (t6) are a side ( 13A) is any one of the packaging bags (10) of the first invention to the sixth invention located at both ends of the bag.

According to the present invention, it is possible to provide a packaging bag whose bottom can be easily formed and which can stand on its own.

It is a figure explaining bag 10 of an embodiment. It is a figure explaining bag 10 of an embodiment. FIG. 3 is a diagram illustrating a folding line portion 20 of the bag 10. FIG. 3 is a diagram illustrating ruled lines of a planned mountain fold line 21 and a planned valley fold line 22. FIG. It is a figure explaining the layer structure of the layered product 30 of an embodiment. FIG. 6 is a diagram illustrating a method of folding the laminate 30 along the mountain folding line 21 and the valley folding line 22 of the folding line part 20 to form the bottom part 19 in the bag 10. FIG. 3 is an enlarged view of a cross section of the laminate 30 at a portion where a perforation hole m is formed. It is a figure which shows the deformation form of the bag 10. It is a figure which shows the deformation form of the bag 10. It is a figure which shows the deformation form of the bag 10. It is a figure which shows the deformation form of the bag 10. It is a figure which shows the deformation form of the bag 10.

Embodiments of the present invention will be described below with reference to the drawings and the like. Note that each figure shown below, including FIG. 1, is a schematic diagram, and the size and shape of each part are appropriately exaggerated for easy understanding.
Numerical values such as dimensions and material names of each member described in this specification are examples of embodiments, and are not limited to these, and may be appropriately selected and used.
Furthermore, in this specification, terms that specify shapes and geometrical conditions, such as terms such as parallel and orthogonal, do not have strict meanings, but also include states that have errors to the extent that they can be considered parallel or orthogonal. shall be included.

(Embodiment)
FIGS. 1 and 2 are diagrams illustrating a bag 10 of this embodiment. FIG. 1 shows the bag 10 as seen from the back side (the side where a back seal part 141 described later is provided), and FIG. 2 shows the bag 10 as seen from the front side.
In each figure shown below, including FIGS. 1 and 2, an XYZ orthogonal coordinate system is appropriately provided in order to facilitate explanation and understanding. In this coordinate system, as shown in FIG. 1, the vertical direction (vertical direction) of the bag 10 is the Y direction, the horizontal direction (horizontal direction) of the bag 10 is the X direction, and the thickness direction of the bag 10 is the Z direction. . When the bag 10 shown in FIG. 1 is viewed from the back side, the direction toward the right side is defined as the +X direction, the direction toward the upper side is defined as the +Y direction, and the direction from the front side toward the back side is defined as the +Z direction.

The bag 10 is a pillow-shaped packaging bag (flat bag-shaped packaging bag) formed by bag-making the laminate 30 by heat sealing or the like.
The bag 10 includes a plurality of seal parts (back seal part 141, upper seal part 111, and lower seal part 121, which will be described later) that join the inner surfaces of the laminate 30 (the inner surfaces of the bag 10). These seal portions form a storage portion 17 in which contents (not shown) are stored inside the bag 10, and are configured to seal the bag 10.

The contents (not shown) accommodated in the accommodating portion 17 include, for example, food. Examples of foods include fried foods such as snacks and dried foods such as dried squid.
Further, the storage portion 17 may be filled with gas in addition to contents such as food. Examples of gases include inert gases such as nitrogen. By filling the accommodating portion 17 with inert gas, it is possible to prevent the food from being oxidized and the flavor of the food to deteriorate.

In FIG. 1, the bag 10 has an upper part 11 (third side) which is the upper side (+Y side), a lower part 12 (fourth side) which is the lower side (-Y side) opposite to the upper part 11, and an upper part. It has a pair of side parts 13 (first side, second side) extending from 11 to lower part 12. Furthermore, the bag 10 has a rectangular back surface portion 15 and a rectangular surface portion 16 located on the opposite side (−Z side) thereof, so that the storage portion 17 also It is formed into a rectangular shape when viewed from the thickness direction.
When the bag 10 is viewed from its thickness direction (Z direction), the upper part 11, the lower part 12, and the two side parts 13 correspond to each side of the rectangular back part 15 and front part 16.
The back surface portion 15 and the surface portion 16 are formed by folding back one rectangular laminate 30, and the back surface portion 15 and the surface portion 16 are connected at the side portion 13.

Furthermore, the bag 10 has a side edge of one laminate 30 in the lateral direction (X direction) on its inner surface (the surface on the accommodating part 17 side, that is, the surface on the side of the sealant layer 32 described below of the laminate 30). A folded palm portion 14 formed by overlapping the palms is provided on the back side (+Z side). A back seal portion 141 is formed by joining the palms together by heat sealing or the like.

The palms together part 14 is formed to protrude from the back part 15. In this embodiment, the palms in prayer section 14 is tilted to the left (-X side) and is stacked on the back surface section 15 located on the left side of the palms in prayer section 14. Note that the present invention is not limited to this, and the palms in prayer portion 14 may be tilted to the right side (+X side) and overlapped on the back surface portion 15 located on the right side of the palms in prayer portion 14 .

The back seal part 141 is formed in the palm-to-face part 14 located on the back side (+Z side) of the bag 10, and seals the edge of one laminate 30 in the lateral direction (X direction) to the inner surface of the bag 10 (with a sealant to be described later). The layers (surfaces on the layer 32 side) are bonded so that they overlap each other (so-called bonding).
The back seal part 141 is provided so as to extend from the upper part 11 to the lower part 12 along the vertical direction (Y direction) of the bag 10. The direction in which the back seal portion 141 extends is perpendicular to the direction in which the upper and lower edges of the laminate 30 extend.
Further, the back seal portion 141 is formed to extend from the base 142 to the end portion 143 of the folded palms portion 14 in the width direction (X direction).

The upper part 11 is provided with an upper seal part 111 extending along this, and the lower part 12 is provided with a lower seal part 121 extending along this. The upper seal part 111 and the lower seal part 121 join the inner surfaces of the laminate 30 to each other by heat sealing or the like to form the front surface 16 and the back surface 15 of the bag 10.
Here, before the contents are stored in the storage portion 17, the bag 10 becomes a sealed portion in an unsealed state in which the upper seal portion 111 or the lower seal portion 121 is not heat-sealed. In the present embodiment, for example, before the contents are stored, the upper part 11 of the bag 10 is the sealing portion, and after the contents are stored in the storage portion 17, the sealing portion is heat-sealed. An upper seal portion 111 is formed to seal the contents in the bag 10.

The method for forming each seal portion is arbitrary as long as the inner surfaces of the laminate 30 (surfaces forming the inside of the bag 10) can be joined to each other to seal the bag 10. In this embodiment, the inner surface of the laminate 30 is made up of a sealant layer 32, which will be described later, and each seal is made by heat-sealing, in which the sealant layer 32 is melted by heating and the inner surfaces of the laminate 30 are welded together. part is formed.

Of the two side parts 13 of the bag 10, as shown in FIG. The left side (−X side) is defined as the side portion 13B (second side).
Folding line portions 20 are provided in areas corresponding to the accommodating portion 17 of the bag 10, on the upper 11 side and the lower portion 12 side of the side portion 13A. In the present embodiment, the planned fold line section 20 has four planned mountain fold lines 21 (21a to 21d) and four planned valley fold lines 22 (22a to 22d).
The planned mountain fold line 21 and the planned valley fold line 22 of the planned fold line section 20 are provided to facilitate the consumer's folding of the laminate 30 forming the bag 10 to form the bottom portion 19. In the present embodiment, mountain folding means folding the laminate 30 so that the inner surfaces of the laminate 30 face each other and are stacked together, and valley folding means folding the laminate 30 so that the outer surfaces of the laminate 30 face each other and are stacked. It is to fold.

FIG. 3 is a diagram illustrating the planned folding line portion 20 of the bag 10. FIG. 3 shows an enlarged view of the upper part 11 side of the side part 13A of the bag 10 when viewed from the back side (+Z side). First, the folding line portion 20 provided on the upper portion 11 side of the side portion 13A of the bag 10 will be described as an example.
As shown in FIGS. 1 to 3, on the top 11 side of the side portion 13A of the bag 10, as the folding line portion 20, mountain folding lines 21a, 21b and valley folding lines 22a, 22b are provided. There is. The planned mountain fold line 21a and the planned valley fold line 22a are provided on the back surface portion 15, and the planned mountain fold line 21b and the planned valley fold line 22b are provided on the front surface portion 16.

The planned mountain fold line 21a is provided on the back surface part 15, and as shown in FIG. 1 and FIG. 3, the right (+ ) with a predetermined dimension in an oblique direction forming an angle α toward the lower left side. The end point of the planned mountain fold line 21a on the opposite side from the point t1 is defined as a point t2.
As shown in FIG. 2, the planned mountain fold line 21b is provided on the surface portion 16 so as to correspond to the above-mentioned planned mountain fold line 21a, and the planned mountain fold line 21a and the planned mountain fold line 21b are They are provided so as to overlap when viewed from the thickness direction (Z direction) of the bag 10. The end point of the planned mountain fold line 21b on the opposite side from the point t1 is defined as a point t3.

The planned valley fold line 22a is provided on the back surface portion 15 along the extending direction (Y direction) of the side portion 13A from point t2 to point t4 on the lower end 111a of the upper seal portion 111. Point t2 is the intersection of the planned mountain fold line 21a and the planned valley fold line 22a.
As shown in FIG. 2, the planned valley fold line 22b extends along the extending direction (Y direction) of the side portion 13A from point t3 so as to correspond to the above-described planned valley fold line 22a on the surface portion 16. It is provided up to a point t5 on the lower end 111a of the upper seal portion 111. The planned valley fold line 22a and the planned valley fold line 22b overlap when viewed from the thickness direction (Z direction) of the bag 10. Point t3 is the intersection of the planned mountain fold line 21b and the planned valley fold line 22b.

On the lower part 12 side of the bag 10, planned mountain fold lines 21c, 21d and planned valley fold lines 22c, 22d are provided as the planned fold line section 20. As shown in FIGS. 1 and 2, the planned mountain fold line 21c and the planned valley fold line 22c are provided on the back surface portion 15, and the planned mountain fold line 21d and the planned valley fold line 22d are provided on the surface portion 16. There is.
As shown in FIG. 1, the planned mountain fold line 21c is at a point t6 (second corner) of the side portion 13A side and the lower part 12 side of the storage portion 17 (in FIG. An oblique direction forming an angle α to the upper left side with respect to the extending direction (X direction) of the lower seal portion 121, with the end point of the upper end 121a on the side portion 13A side as one end, toward the center of the rectangular shape of the back surface portion 15. are provided with predetermined dimensions. The end point of the planned mountain fold line 21c on the opposite side from the point t6 is defined as a point t7.

As shown in FIG. 2, the planned mountain fold line 21d is provided on the surface portion 16 so as to correspond to the above-mentioned planned mountain fold line 21c, and the planned mountain fold line 21c and the planned mountain fold line 21d are formed on the bag 10. are provided so as to overlap when viewed from the thickness direction (Z direction). The end point of the planned mountain fold line 21d on the opposite side from the point t6 is defined as a point t8.

As shown in FIG. 1, the planned valley fold line 22c extends from a point t7 to a point t9 on the upper end 121a of the lower seal portion 121 on the back surface portion 15 along the extending direction (Y direction) of the side portion 13A. It is provided. Point t7 is the intersection of the planned mountain fold line 21c and the planned valley fold line 22c.
As shown in FIG. 2, etc., the valley fold planned line 22d extends from the point t8 along the extending direction (Y direction) of the side portion 13A to the lower seal portion 121 so as to correspond to the above-mentioned valley fold planned line 22c. It is provided up to a point t10 on the upper end 121a. The planned valley fold line 22c and the planned valley fold line 22d overlap when viewed from the thickness direction (Z direction) of the bag 10. Point t8 is the intersection of the planned mountain fold line 21d and the planned valley fold line 22d.

In the present embodiment, an example is shown in which one end of the valley fold planned lines 22a and 22b is the lower end 111a of the upper seal part 111, but the present invention is not limited to this. It may be the upper part 11. Similarly, although the example in which one end of the valley fold planned lines 22c and 22d is the upper end 121a of the lower seal portion 121 is shown, the valley fold planned lines 22a and 22c are not limited to this. One end thereof may be the lower portion 12 .

The planned mountain fold line 21c and the planned mountain fold line 21a, and the planned mountain fold line 21d and the planned mountain fold line 21b have similar dimensions. Furthermore, the planned valley fold line 22a and the planned valley fold line 22c, and the planned valley fold line 22b and the planned valley fold line 22d have similar dimensions.
That is, the planned folding line part 20 on the upper part 11 side and the planned folding line part on the lower part 12 side are provided in line symmetry with respect to the center line of the bag 10 in the vertical direction (Y direction).

The planned mountain fold lines 21 (21a to 21d) are aligned in the extending direction of the upper seal part 111 (the extending direction of the upper part 11 (third side)) and the extending direction of the lower seal part 121 (the extending direction of the lower part 12 (fourth side)). In this embodiment, the angle α formed with the extending direction of the side) is 45°, as an example. However, the angle α is not limited to this, and may be within the range of 40 to 50°.
When the angle α satisfies this angle range, the laminate 30 can be easily folded along the planned mountain fold line 21, and the bottom portion 19 described later can be easily formed.

The planned mountain fold line 21 and the planned valley fold line 22 are provided as visible lines by printing.
As shown in FIG. 3 and the like, the planned mountain fold line 21 is printed as a dashed line on the outer surface of the bag 10. As shown in FIG. 3, etc., the valley fold line 22 is printed as a broken line on the outer surface of the bag 10.
The planned mountain fold line 21 and the planned valley fold line 22 are not limited to the above example, and may be shown as straight lines, etc., and the planned mountain fold line 21 and the planned valley fold line 22 may have different colors. However, they may be the same color. Further, if the difference in the folds can be shown to the consumer by providing a fold display 23 to be described later, for example, broken lines with the same thickness and arrangement pitch may be used.

In addition to the above-described printing, the planned mountain fold line 21 and the planned valley fold line 22 of this embodiment are further formed with a concave ruled line on at least one side along the line that will become the fold.
FIG. 4 is a diagram illustrating the ruled lines of the planned mountain fold line 21 and the planned valley fold line 22. 4(a) and (b) are enlarged views of the cross section of the laminate 30 in the direction perpendicular to the planned mountain fold line 21, and FIGS. A cross section of the laminate 30 in the orthogonal direction is shown on an enlarged scale. In addition, in FIGS. 4A to 4D, the upper side in the drawing is the outer surface of the bag 10, and the lower side is the inner surface of the bag 10.

As shown in FIG. 4(a), the planned mountain fold line 21 is a ruled line having an uneven shape such that the outer surface of the bag 10 is concave and the inner surface thereof is convex. As shown in b), by folding the laminate 30 in the direction of arrow C, a mountain fold is formed along the planned mountain fold line 21 so that the concave side (outer surface side) becomes the fold mountain.
As shown in FIG. 4(c), the valley fold planned line 22 is a ruled line having an uneven shape such that the outer side of the bag 10 is convex and the inner side is concave. As shown in d), by folding the laminate 30 in the direction of arrow D, a valley fold is formed along the valley fold planned line 22 so that the convex side becomes the fold valley.
Such ruled lines are formed, for example, by pressing the laminate 30 from the thickness direction along each planned folding line of the laminate 30 using a convex molding tool and a concave molding tool (not shown). Furthermore, the method for forming ruled lines is not limited to this.

Furthermore, the planned mountain fold line 21 and the planned valley fold line 22 are provided with fold indications 23 such as "mountain fold" and "valley fold" printed on or near the planned lines.
In this embodiment, as shown in FIG. 3, on the outer surface of the bag 10, a "mountain fold" fold display 23 is provided by printing near the planned mountain fold line 21 and along the planned mountain fold line 21, and Near the planned line 22, along the planned valley fold line 22, a fold line display 23 of "valley fold" is provided by printing. Note that in FIGS. 1, 2, etc., illustration of the fold line 23 is omitted for ease of understanding.
By providing such a fold line display 23, it becomes easier for the consumer to visually understand along which fold line the fold line is to be folded.

As shown in FIGS. 1 and 2, an opening portion 18 including a notch 181 and an opening line 182 is provided near the side portion 13B (second side) of the bag 10.
In this embodiment, the notch 181 is provided in the upper end of the upper portion 11 as a V-shaped notch. The cut 181 may be provided as a linear cut or the like as long as it has a shape that makes it easy to break the laminate 30 forming the bag 10, and is not particularly limited to that shape.

The scheduled opening line 182 is provided along the extending direction (Y direction) of the side portion 13B from the upper portion 11 to the lower portion 12. The expected opening line 182 may be only a printed display such as a broken line, may be formed by, for example, a perforation, a half cut, etc., or may be formed by a combination of these. In this embodiment, the expected opening line 182 is indicated by a broken line printed on the outer surface of the back surface portion 15 and front surface portion 16 of the bag 10. As shown in FIG. 1, etc., this broken line preferably has a different pitch, thickness, color, etc. from the above-mentioned valley fold planned line 22.

(Layer configuration of laminate 30)
Next, the layer structure of the laminate 30 constituting the bag 10 will be explained.
The laminate 30 is a flexible soft packaging material and includes at least a paper base layer 31 and a sealant layer 32.
FIG. 5 is a diagram illustrating the layer structure of the laminate 30 of this embodiment. In FIG. 5, the upper side of the drawing is shown as the outer surface of the bag 10, and the lower side of the drawing is shown as the inner surface of the bag 10.
As shown in FIG. 5, the laminate 30 of this embodiment has a protective layer 34, a printing layer 33, a paper base layer 31, and a sealant layer 32, which are laminated together in order from the outer surface of the bag 10. has been done.

The paper base material layer 31 is a base material layer that supports the sealant layer 32, and unlike cup base paper for paper cups having a basis weight of more than 100 g/m ² or milk carton base paper for paper containers, the paper base layer 31 is flexible. It is a paper base material that constitutes so-called flexible paper packaging.
Specifically, the basis weight of the paper base layer 31 is preferably 30 g/m ² or more and 100 g/m ² or less, more preferably 35 g/m ² or more and 70 g/m ² or less. When the basis weight of the paper base layer 31 is 30 g/m ² or more and 100 g/m ² or less, it has strong mechanical strength, shape retention property (dead hold property) and hand tearability, and is suitable for packaging such as packaging bags. It has flexibility as a body.
Examples of the paper base layer 31 include kraft paper, high-quality paper, coated paper, and paper with barrier properties (barrier coated paper).
The paper base layer 31 of this embodiment is made of kraft paper and has a basis weight of 60 g/m ² .

The printing layer 33 is a layer provided on one side of the paper base layer 31 (the surface that becomes the outer surface of the bag 10, the surface opposite to the sealant layer 32), and has a pattern printed thereon. Here, the term "picture" refers to a recording target in various forms that can be printed on the paper base material layer 31, and includes a wide range of figures, characters, patterns, patterns, symbols, patterns, marks, etc., without being particularly limited. include. Printing of the above-mentioned folding line portion 20, such as a broken line or a chain line, is included in this pattern. Furthermore, if the contents of the bag 10 are food, the picture also includes a diagram of the contents and characters indicating information such as the product name, expiration date, manufacturing date, and manufacturing number of the contents.

The protective layer 34 is a layer provided on the printed layer 33, and is a layer located on the outermost side of the bag 10 in the thickness direction of the laminate 30 when the laminate 30 is made into a bag 10. be. This protective layer 34 is formed, for example, by coating with overprint varnish (OP varnish), and can prevent the printed layer 33 from disappearing due to rubbing, etc., and can prevent the pattern from being tampered with. The protective layer 34 also has functions such as water repellency and water resistance that protect the paper base layer 31.
In addition, although the above-mentioned explanation demonstrated the example which provided the printing layer 33 and the protective layer 34 in order on the paper base material layer 31, the printing layer 33 and the protective layer 34 may be omitted suitably as needed.

The sealant layer 32 is the innermost layer of the bag 10 in the thickness direction of the laminate 30. The sealant layer 32 has heat-sealing properties that provide adhesive properties when heated. This sealant layer 32 is not limited to a single layer, but may be composed of a plurality of layers.
The sealant layer 32 may be provided by dry laminating a film made of a resin with heat sealability on one side of the paper base layer 31, or may be provided by melting a resin with heat sealability and attaching it to the paper base material. It may be extruded and molded onto one side of the layer 31.

When using a resin film as the sealant layer 32, an unstretched polyolefin resin film is preferred, and an unstretched polyethylene resin film and an unstretched polypropylene resin film are particularly preferred.
Examples of the resin constituting the unstretched polyethylene resin film include low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), and linear low density polyethylene (LLDPE). Not only these homopolymers, but also copolymerized polyolefins in which a part of ethylene is replaced with other monomers may be used.
Examples of the resin constituting the unstretched polypropylene resin film (CPP film) include homopolypropylene, random polypropylene, and block polypropylene. It may also be a copolymerized polypropylene in which a portion of propylene is replaced with other monomers.
Furthermore, when extrusion molding the sealant layer 32, the resins constituting the resin film described above can be used, and among them, low density polyethylene (LDPE) is preferable. Also suitable is EMAA (ethylene/methacrylic acid copolymer resin).

Whether a resin film is used as the sealant layer 32 or the sealant layer 32 is extruded, the thickness of the sealant layer 32 is preferably 20 μm or more and 60 μm or less in order to be heat-sealed without any gaps by heating. desirable. If the thickness of the sealant layer 32 is less than 20 μm, there is a possibility that sufficient heat seal strength cannot be maintained. Furthermore, if the thickness of the sealant layer 32 is greater than 60 μm, there is a risk that the shape retention property (dead hold property) when the laminate 30 is folded to form the bottom portion 19 described later and the hand tearability when opening the package may be reduced. be. Therefore, the thickness of the sealant layer 32 is preferably within the above range.
In this embodiment, the sealant layer 32 is a resin film made of low density polyethylene (LDPE), and has a thickness of 25 μm.

In addition, the sealant layer 32 is not limited to the above example, but may be formed by, for example, dissolving or dispersing a resin having heat-sealing properties on the inner surface of the paper base layer 31 in an organic solvent or an aqueous solvent containing water. It may be formed by applying and drying a heat sealing agent (HS agent). Examples of the resin include polyolefin resins such as EVA (ethylene-vinyl acetate copolymer) and ionomer resins, modified polyolefin resins such as chlorinated vinyl acetate resin (vinyl chloride-vinyl acetate copolymer), and chlorinated polyolefins; Examples include polyester resins, acrylic resins, polyethyleneimine resins, etc., and a single substance or a copolymer of each can be used. It is preferable that such a heat sealing agent has a dry coating amount of 1 to 10 g/m ² .

In addition to the above layers, the laminate 30 may further include other layers. Examples of other layers include a (gas) barrier layer that prevents permeation of oxygen gas, water vapor, etc., an adhesive resin layer that joins each layer, and an anchor coat layer. Examples of the barrier layer include metal foils such as aluminum foils, as well as vapor-deposited films in which metals such as aluminum or metal oxides such as alumina, silica, etc. are formed into thin films on a base material by a vapor deposition method or the like. It is also possible to form a barrier layer by coating, and such barrier coating agents include PVA (polyvinyl alcohol), EVOH (ethylene-vinyl alcohol copolymer resin), urethane resin, acrylic resin, and inorganic resins. Examples include those containing fillers and the like.

As a specific layer structure of the laminate 30 forming the bag 10, the following examples may be given. Note that "/" is used as a notation to indicate the boundary between layers when listing the laminated structure. As for the layer structure, the abbreviations of the layers are written from the outside to the inside. That is, the layer described on the leftmost side is the outermost layer.
Protective layer 34 (OP varnish) / Printing layer 33 / Paper base layer 31 (kraft paper, basis weight 60 g/m ² ) / Sealant layer 32 (LDPE thickness 25 μm)
Protective layer 34 (OP varnish) / Printing layer 33 / Paper base layer 31 (kraft paper, basis weight 60 g/m ² ) / Sealant layer 32 (heat sealant dry coating amount 3 g/m ² )
Protective layer 34 (OP varnish) / Printing layer 33 / Paper base layer 31 (kraft paper, basis weight 60 g/m ² ) / Barrier coat layer / Sealant layer 32 (heat sealant dry coating amount 3 g/m ² )

(Bottom formation method)
Next, a method of forming a bottom part on the bag 10 and making it self-supporting will be explained.
FIG. 6 is a diagram illustrating a method of folding the laminate 30 along the mountain folding line 21 and the valley folding line 22 of the folding line part 20 to form the bottom part 19 in the bag 10. 6(a) is a diagram of the bag 10 viewed from the side 13A side (+X side), and FIG. 6(b) is a diagram of the bag 10 viewed from the top 11 (+Y side). (c) and (d) are perspective views of the bag 10.
First, as shown in FIG. 6A, the upper and lower ends of the laminate 30 on the side 13A side are mountain-folded along the planned mountain-fold lines 21 (21a to 21d) of the planned folding line portion 20. As a result, the end portion 11A of the upper portion 11 and the end portion 12A of the lower portion 12 on the side portion 13A side have a substantially triangular shape when viewed from the side portion 13A side.

Next, as shown in FIG. 6(b), the laminate 30 is valley-folded along the planned valley-folding line 22 to form the bottom portion 19. Although FIG. 6(b) shows the upper part 11 side where the valley fold planned lines 22a and 22b are provided, the lower part 12 side where the valley fold planned lines 22c and 22d are provided is also similar to the valley fold planned lines 22a and 22b. Fold along the valley. By valley-folding the laminate 30 along the planned valley-folding line 22, the end 11A of the upper part 11 on the side 13A side is overlapped with the upper part 11, and the end 12A of the lower part 12 on the side 13A side is overlapped with the lower part 12. However, the valley fold portion gradually opens due to the weight of the end portions 11A and 12A. Then, as shown in FIG. 6C, the end portion 11A of the upper portion 11 and the end portion 12A of the lower portion 12 are located at both ends of the side portion 13A of the bottom portion 19 in the extending direction (Y direction). In this state, the bag 10 can stand on its own with the bottom 19 facing downward in the vertical direction.

In addition, even if the laminate 30 is valley-folded along the valley-folding planned line 22 and the end portions 11A and 12A remain stacked on the upper portion 11 and the lower portion 12, respectively, the bag 10 is sufficiently secured by the bottom portion 19. Can stand on its own. However, as described above, by configuring the end portion 11A and the end portion 12A to be located at both ends of the side portion 13A of the bottom portion 19 in the extending direction (Y direction), the planarity of the bottom portion 19 is improved, and Since the ground contact area of the bag 10 increases, the bag 10 can stand on its own more stably.

Next, as shown in FIG. 6(c), the bag 10 is cut along the opening line 182 from the cut 181 and opened. In this case, the laminate 30 may be cut by hand or may be cut using scissors or the like.
As shown in FIG. 6(d), an opening 183 is formed by opening the bag 10 along the planned opening line 182. The bag 10 can stand on its own with the bottom 19 vertically lower in a state in which the contents are stored and an opening 183 is formed. Therefore, the bag 10 can be used, for example, as a container for eating, etc.
After the contents of the bag 10 are exhausted, the consumer can undo the folds that formed the bottom 19 to form the bag 10 in the form of a flat bag.
In the above description, the bag 10 is opened after the bottom part 19 is formed. However, the bottom part 19 may be formed after the bag 10 is opened with the opening 183 facing upward in the vertical direction. .

When a pillow-shaped flat bag type bag formed from a laminate with a general resin base layer is folded as described above, the folded part tries to return to its original shape, but cannot hold the creases sufficiently, resulting in poor shape retention (dead hold). On the other hand, the laminate 30 forming the bag 10 has the paper base layer 31 as the main base layer, and has high shape retention (dead hold) when folded along the planned folding line 20. . Therefore, the bag 10 can maintain the state in which the bottom portion 19 is formed by being folded along the folding line 20 as described above.

In this embodiment, in order to form the bottom portion 19 that makes the bag 10 stably self-supporting, it is preferable that the dimensions of each part of the bag 10 satisfy the following conditions.
The ratio S2/S1 of the vertical direction (Y direction) dimension S2 and the horizontal direction (X direction) dimension S1 of the bag 10 shown in FIG. 1 etc. is preferably 1 or more and 10 or less, and 1 or more and 5 or less. More preferably, the number is 1 or more and 3 or less. When the ratio S2/S1 is smaller than 1, the height from the opening 183 to the bottom 19 (the depth of the bag) after forming the bottom 19 is larger than the size of the bottom 19, and the bag becomes freestanding. The stability of 10 may be reduced. Moreover, if the ratio S2/S1 is larger than 10, the shape of the bottom portion 19 becomes an elongated rectangular shape, which may reduce the stability of the bag 10 when it stands on its own. Therefore, it is preferable that the ratio S2/S1 satisfies the above range.

The formed bottom portion 19 has a rectangular shape as described above, and the dimension along the valley fold plan line 22 is S3, and the valley fold plan along the extending direction (Y direction) of the side portion 13A is When the dimension between the lines 22a and 22c is S4 (see FIGS. 6(b) and (d)), the ratio S4/S3 is preferably 1 or more and 5 or less, and preferably 1 or more and 3 or less. More preferably, it is 1 or more and 2 or less. If the ratio S4/S3 is smaller than 1, the tip portions of the upper part 11 and the lower part 12 folded along the valley fold line 22 overlap, and the stability of the bottom part 19 decreases, causing the bag 10 to stand on its own. stability may decrease. Furthermore, if the ratio S4/S3 is greater than 5, the bottom portion 19 will have an elongated rectangular shape, which may reduce the stability of the bag 10 when it stands on its own. Further, therefore, it is preferable that the ratio S4/S3 is within the above range.

In addition, in the lateral direction (X direction) of the bag 10, the dimension from the side portion 13B to the position where the valley fold planned line 22a is provided (the dimension from the side portion 13B to the position where the valley fold planned line 22c is provided) S5 The ratio S1/S5 between the size S1 and the dimension S1 in the lateral direction (X direction) of the bag 10 is preferably 2 or less, and more preferably 4/3 or more and 2 or less. When the ratio S1/S5 is 2 or less, the stability of the bag 10 on which the bottom portion 19 is formed when it stands on its own increases, and when it is 4/3 or more and 2 or less, the stability when the bag 10 stands on its own is further improved. can be increased.

According to this embodiment, the following effects can be achieved.
Since the laminate 30 includes the paper base material layer 31, the consumer can easily fold the laminate 30 along the planned mountain fold line 21 and the planned valley fold line 22 of the planned fold line section 20, and fold the laminate 30 easily. The subsequent shape retention (dead hold property) is also high. Therefore, according to the present embodiment, the consumer can easily form the bottom 19 of the bag 10, the shape of the formed bottom 19 is unlikely to collapse, and the bag 10 can easily stand on its own.
Furthermore, according to the present embodiment, by forming the bottom part 19, the opening 183 of the bag 10 opens wider than in the case where the bottom part 19 is not formed, making it easier for the consumer to take out the contents of the bag 10. .
Furthermore, according to the present embodiment, crease ruled lines are formed along each of the planned mountain fold lines 21 and the planned valley fold lines 22 of the planned fold line section 20, making it easy for consumers to fold. The bottom portion 19 can be formed easily.

Further, the bottom part 19 is formed by folding the laminate 30 along the planned mountain fold line 21 and the planned valley fold line 22 of the planned fold line part 20, and when the bottom part 19 is no longer needed, the fold can be opened. The bag 10 can be returned to a flat bag state. Therefore, according to the present embodiment, the bag 10 can be made to stand on its own by forming the bottom part 19 as needed, and when the bag 10 is disposed of, it can be easily returned to the flat bag state, and the shape of the bag 10 can be changed. Increased freedom. Furthermore, the volume of the bag 10 when discarded can be reduced.
Further, according to the present embodiment, the laminate 30 includes the paper base layer 31 and does not include a resin base layer, so the amount of resin material used can be reduced, and the It is possible to suppress the impact on the ecosystem and take measures to improve the global environment.

(Deformed form)
Various modifications and changes are possible without being limited to the embodiments described above, and these are also within the scope of the present invention.
(1) In the embodiment, the planned mountain fold line 21 and the planned valley fold line 22 of the planned fold line section 20 may be provided only by printing straight lines, broken lines, etc., or by printing straight lines etc. and "mountain folding". It may be provided in a form with a fold display 23 such as a "valley fold", it may be provided only with concave or convex crease ruled lines, it may be provided with perforations, half cuts, etc. They may be combined as appropriate.
FIG. 7 is an enlarged view of a cross section of the laminate 30 at a portion where the perforation hole m is formed. As shown in FIG. 7, the perforation holes m penetrate the paper base layer 31, the printing layer 33, and the protective layer 34, but do not penetrate the sealant layer 32. With this configuration, the freshness of the contents can be maintained even when perforations are provided.
Although not shown in the drawings, when a half cut is provided, it is preferable that the half cut is formed from the outer surface side of the paper base layer 31.

(2) In the embodiment, the bag 10 may include a display section that shows the folding procedure, the completed shape, and the like.
FIG. 8 is a diagram showing a modified form of the bag 10. Similar to FIG. 1, FIG. 8 is a view of the modified bag 10 viewed from the back side (+Z side).
As shown in FIG. 8, the modified bag 10 includes a display section 40 that describes the folding procedure to form the bottom portion 19. By providing such a display section 40, the consumer can visually understand how to form the bottom part 19 more easily, and it becomes easier to fold the bag 10 to form the bottom part 19. In FIG. 8, the display unit 40 shows the folding method using drawings and text, but the display unit 40 is not limited to this, and may show only the drawing. Alternatively, the display section 40 may show only a diagram of the bag 10 with the bottom portion 19 formed, instead of the folding procedure. Furthermore, the display section 40 may be provided on the surface section 16 of the bag 10.

(3) In the embodiment, a planned mountain fold line or a planned valley fold line may be further provided to make it easier to form the bottom part 19 or to improve the stability of the shape of the bottom part 19.
9 and 10 are diagrams showing modified forms of the bag 10. 9 and 10 are views of the modified bag 10 viewed from the back side (+Z side), similar to FIG. 1. In FIG. 9A, the scheduled opening portion 18 and the like are omitted for ease of understanding.

The bag 10 of the modified form shown in FIG. 9(a) has, in addition to the planned mountain folding lines 21 (21a to 21d) and the planned valley folding lines 22 (22a to 22d) shown in the above-described embodiment, furthermore, A planned mountain fold line 24 (24a, 24b) is provided along the extending direction (Y direction) of 13A.
The planned mountain fold line 24a is provided from point t2 to point t7 on the back surface portion 15 along the extending direction (Y direction) of the side portion 13A. Although not shown in the drawings, a planned mountain fold line 24b corresponding to the planned mountain fold line 24a is provided on the surface portion 16 so as to overlap when viewed from the thickness direction (Z direction) of the bag 10.
By providing such a planned mountain fold line 24, it becomes easier to form the bottom portion 19 into a rectangular shape, which has the effect of increasing the stability of the bag 10 when it stands on its own.

The bag 10 in the modified form shown in FIG. (third side) and the lower part 12 (fourth side) along the extending direction (X direction) toward the side part 13B (second side). ) is provided.
The planned mountain fold line 25a is provided on the back surface portion 15, and extends from the point t2 along the extending direction (X direction) of the upper portion 11 to the side portion 13B. The planned mountain fold line 25c is provided on the back surface portion 15, and extends from point t7 to the side portion 13B along the extending direction (X direction) of the lower portion 12.
Further, although not shown, on the surface portion 16, mountain folding planned lines 25b and 25d corresponding to the mountain folding planned lines 25a and 25c are provided so as to overlap when viewed from the thickness direction (Z direction) of the bag 10. There is.

By providing such a planned mountain fold line 25, the bag 10 after opening can be made into a substantially rectangular parallelepiped shape, the shape of the opening 183 of the bag 10 is stabilized, and the contents can be taken out more easily. be. Note that the planned mountain fold line 25 may have an end point on the side portion 13B side up to an intersection with the planned opening line 182.

The bag 10 in the modified form shown in FIG. 10 corresponds to a form that is a combination of the modified forms shown in FIGS. Planned lines 24 (24a, 24b) are provided, and further, planned mountain fold lines 25 (25a to 25d) extending toward the side portion 13B along the extending direction (X direction) of the upper portion 11 and the lower portion 121 are provided. It is provided.

By providing such a planned mountain fold line 24 and a planned mountain fold pattern 25, the shape of the bottom portion 19 can be more easily formed into a rectangular shape, and the stability of the bag 10 when it stands on its own can be improved. After opening, the bag 10 can be formed into a substantially rectangular parallelepiped shape, which stabilizes the shape of the opening 183 of the bag 10 and makes it easier to take out the contents.
In addition, the present invention is not limited to the above-mentioned example, and a combination of planned mountain fold lines, planned valley fold lines, etc. may be provided as appropriate.

(4) In the embodiment, the planned folding line portion 20 may be provided on the side portion 13B side. In this case, the scheduled opening portion 18 is provided on the side portion 13A side.
Further, in the embodiment, the folding line portions 20 may be provided at both ends of the upper portion 11 or at both ends of the lower portion 12.
FIG. 11 is a diagram showing a modified form of the bag 10. Similar to FIG. 1, FIG. 11 is a diagram of the modified bag 10 viewed from the back side (+Z side).
FIG. 11 shows an example in which the planned mountain fold line 21 and the planned valley fold line 22 of the planned fold line portion 20 are provided at both ends of the lower portion 12 side, and the planned opening portion 18 is provided on the upper portion 11 side. Here, the scheduled opening section 18 is shown as having only a planned opening line 182.
In this manner, when the planned folding line portions 20 are provided at both ends of the lower portion 12 side, the lower seal portion 121 is located at or near the center of the bottom portion 19 formed. In this case, it is better to form the bottom part 19 after folding the lower seal part 121 toward the front surface part 16 side or the back part 15 side in advance, so that the shape of the bottom part 19 is stabilized and the self-sustainability of the bag 10 is stabilized. do.
Further, when the planned folding line portions 20 are provided at both ends of the upper portion 11 side, the planned opening portions 18 are provided on the lower portion 12 side.

(5) In the embodiment, the bag 10 is a pillow-shaped packaging bag, but the bag 10 is not limited to this, and may be a three-sided bag sealed on three sides.
FIG. 12 is a diagram showing a modified form of the bag 10.
The modified bag 10 shown in FIG. 12 is a three-sided bag including an upper seal portion 111, a lower seal portion 121, and a side seal portion 131 provided on one side portion 13B. The folding line portion 20 can also be applied to such a three-sided bag.

The modified bag 10 shown in FIG. 12 is one in which a single layered product 30 is folded in half, and seal portions are formed on the edges of three sides other than the fold by heat sealing or the like. In this modified bag 10, the back surface portion 15 and the front surface portion 16 are connected at the side portion 13A (first side). Further, the upper part 11 (third side), the lower part 12 (fourth side), and the side part 13B (second side) are joined by a sealant layer 32.
When the bag 10 is a three-sided bag as described above, the planned folding line portion 20 may be provided at the upper and lower ends of the side portion 13A that does not have the seal portion, as shown in FIG. However, it may be provided at the upper and lower ends of the side portion 13B side where the side seal portion 131 is formed.

(5) In the embodiment, the upper seal portion 111 or the like may have a hanging portion that allows the bag 10 to be hung from a hook shown in the drawings or the like.
Such a hanging portion may be a through hole formed in the upper seal portion 111 in a circular or elliptical shape, or may be provided as a notch in an arc shape or the like.

(6) In the embodiment, an example is shown in which the bag 10 includes the scheduled opening section 18, but the present invention is not limited to this, and the bag 10 may not include the scheduled opening section 18.

Note that this embodiment and the modified embodiments can be used in combination as appropriate, but detailed explanation will be omitted. Further, the present invention is not limited to the embodiments described above.

10 bag 11 upper part 111 upper seal part 12 lower part 121 lower seal part 13 (13A, 13B) side part 14 palms together part 141 back seal part 15 back part 16 surface part 17 storage part 18 planned opening part 181 notch 182 planned opening line 19 bottom part 20 Planned fold line portion 21 (21a, 21b, 21c, 21d) Planned mountain fold line 22 (22a, 22b, 22c, 22d) Planned valley fold line

Claims (8)

A accommodating part that has a rectangular first surface and a rectangular second surface opposite to the first surface, and stores contents between the first surface and the second surface. A packaging bag formed of
The first surface portion and the second surface portion are constituted by a laminate including at least a paper base layer and a sealant layer,
The first surface portion and the second surface portion are connected to each other on at least one side, and the edges of the other sides are joined by the sealant layer,
a folding line portion is provided at a position corresponding to the accommodation portion on the outer surface of the first surface portion and the second surface portion;
The folding line portion includes at least
a first mountain-fold plan line provided on the first surface and extending in a predetermined dimension from a first corner of the accommodating section in an oblique direction toward the center of the rectangular shape of the first surface;
a second planned mountain fold line provided on the second surface portion at a position corresponding to the first planned mountain fold line;
A rectangular shape of the first surface from a second corner that is provided on the first surface and faces the first corner of the accommodating portion and a first side that is one side of the rectangular shape. a third mountain-fold planned line extending diagonally toward the center side with a predetermined dimension;
a fourth planned mountain fold line provided on the second surface portion at a position corresponding to the third planned mountain fold line;
Provided on the first surface section, intersects the first side of the first surface section from an end point of the first planned mountain fold line opposite to the first corner section, and crosses the first side of the first surface section. A first valley fold planned line provided up to the third side located on the corner side;
a second planned valley fold line provided at a position corresponding to the first planned valley fold line of the second surface;
A line is provided on the first surface and intersects with the first side of the first surface from an end point of the third mountain fold plan line opposite to the second corner and crosses the second side of the first surface. a third valley fold planned line provided up to the fourth side located on the corner side;
a fourth planned valley fold line provided on the second surface portion at a position corresponding to the third planned valley fold line ;
The ratio S2/S1 of the dimension S2 from the third side to the fourth side and the dimension S1 from the first side to the second side opposite to the first side is 1 or more and 10 The following is
A packaging bag in which a bottom part that allows the packaging bag to stand on its own is formed by folding the laminate along the planned folding line. The folding line portion further includes:
Provided on the first surface part, from the intersection of the first planned mountain fold line and the first planned valley fold line, along the first side, the third planned mountain fold line and the a fifth planned mountain fold line provided up to the intersection with the third planned valley fold line;
The packaging bag according to claim 1, further comprising: a sixth planned mountain-fold line provided on the second surface portion at a position corresponding to the fifth planned mountain-fold line. The folding line portion further includes:
Provided on the first surface part, from the intersection of the first planned mountain fold line and the first planned valley fold line, along the extending direction of the third side, to the first side. a seventh planned mountain fold line extending toward the opposing second side;
an eighth planned mountain fold line provided on the second surface portion at a position corresponding to the seventh planned mountain fold line;
Provided on the first surface part, from the intersection of the third planned mountain fold line and the third planned valley fold line to the second side side along the extending direction of the fourth side. The ninth mountain fold line that extends,
The packaging bag according to claim 1 or 2, further comprising: a tenth planned mountain fold line provided on the second surface portion at a position corresponding to the ninth planned mountain fold line. According to any one of claims 1 to 3, the planned fold line portion is formed by at least one of printing, crease rules, and perforations provided in at least the paper base layer. packaging bag. The packaging bag according to any one of claims 1 to 4, further comprising a display section on the outer surface that displays the folding method of the planned folding line section. According to any one of claims 1 to 5, an unsealing scheduled portion is provided near a second side opposite to the first side and along the extending direction of the second side. Packaging bag as described. According to any one of claims 1 to 6, the first corner and the second corner are located at both ends of a side connecting the first surface and the second surface. Packaging bag as described. The sealant layer has a thickness of 20 μm or more and 60 μm or less.
The packaging bag according to any one of claims 1 to 7.

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