JP3460999B1 - Gazette bag - Google Patents

Abstract

Abstract: A bottom portion of a gusset bag is bent without causing damage to the gusset bag, so that the gusset bag can be stably made independent. SOLUTION: A pair of flat portions 3 facing each other and a pair of folds formed in a fold shape and folded inward so that fold lines thereof correspond to each other, and connecting side edges of the flat portions 3 to each other. In the gusset bag having the side surface portion 4, a folding auxiliary portion 11 for bending the bottom portion of the gusset bag to easily form a flat surface on the bottom of the gusset bag, on the outer edge side of the storage portion 10 in which the contents are stored. And a bending assisting portion 11 is formed by a through hole formed in at least one of the plane portion 3 or the side surface portion 4, and a long axis direction of the through hole coincides with an extending direction of a folding line at which a bottom portion is bent. Let it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gusset bag that exhibits stable self-supporting property when contents are stored in an internal storage portion.

[0002]

2. Description of the Related Art Conventionally, standing pouches and flat bottom type gusset bags have been known as packaging bags that ensure independence. These packaging bags have been devised such that the bottom surface portion is formed using a flat member in order to ensure high self-standing.

On the other hand, even for a packaging bag that does not have a flat bottom surface, by folding the bottom portion of the packaging bag, a gusset bag that flattens the bottom portion when the contents are stored to ensure independence is provided. is there. In such a gusset bag, with respect to the bottom of the gusset bag, the flat portion and the side surface are heat-sealed in the shape of a triangle on the outside of the storage portion in which the contents are stored, and the perforated shape extending left and right to these heat-sealed portions It has already been disclosed that the folding means is formed so that the bottom of the gusset bag can be easily folded (see, for example, Patent Document 1).

[0004]

[Patent Document 1] Japanese Patent Laid-Open No. 2001-199452

[0005]

However, if the bending means is formed on a straight line extending in the left-right direction as in the above-mentioned prior art, the bending means may propagate right and left, and the bottom portion of the gusset bag may be cut off. .

The present invention has been made in view of the above problems, and provides a gusset bag in which the bottom portion of the gusset bag is bent without damaging the gusset bag and stable independence can be ensured.

[0007]

According to the present invention, in order to solve the above-mentioned problems, a pair of opposed flat portions are formed in a fold shape and are folded inward so that their fold lines correspond to each other. In a gusset bag having a pair of side surface portions that connect the side edges of the flat surface portion, the bottom portion of the gusset bag is closer to the outer edge side than the storage portion in which the contents are stored,
Auxiliary section bent to easily form a flat surface by bending the bottom portion of the gusset bag is formed, the folding auxiliary portion
Is a recess in which the thickness of this gazette bag has been reduced.
The recess of the, while forming a through hole in the side portion,
A flat surface portion is attached to this side surface portion to form the side surface.
The through hole formed in the section is hidden by the flat section.
Adopted a gazette bag.

In this way, the bending assist portion is provided.
The rigidity of that part is reduced, and the bottom of the gusset bag is
Easy to fold. Flat by bending the bottom
Can be formed into a gusset bag with high independence
Wear. In addition, a gusset bag with a good appearance can be easily shaped.
Can be done.

Further, in order to solve the above problems,
A pair of flat parts and a fold line
A pair of side parts folded inward so as to correspond to each other
And has a flat surface and side surfaces.
Inner surfaces of four ridges are heat-sealed to form a cylinder
Then, heat seal the upper and lower edges of this cylinder.
The heat-sealed bottom edge and
The flat portion and the side so as to connect the ridgeline
Triangular shape by heat-sealing each inner surface of each surface
In a gusset bag with the seal part of
At least one of the flat portions of the rectangular seal portion
And the side part are heat-sealed.
Bend the bottom of the gusset bag to easily form a flat surface.
A folding assisting part is formed, and this folding assisting part is
Is a through hole formed in the side surface portion.
Fold the bottom of this gusset bag along the long axis of
This bending is made to match the direction of extension
A gusset bag whose auxiliary part is hidden by the flat part
Adopted.

[0010]

[0011]

[0012]

[0013]

[0014]

[0015]

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment] FIG. 1 shows a first embodiment of the present invention.
The top view of the gusset bag 1A concerning embodiment of FIG. This gusset bag 1A includes a pair of opposing flat surface portions 3,
The bag main body 2A includes a bag main body 3A and a pair of side surface portions 4 and 4 connecting both side edges of the flat surface portions 3 and 3. A pouring device 20 for pouring out the contents is attached to the upper edge of the bag body 2A.

The flat portions 3 and 3 constituting the bag body 2A are made of rectangular film materials, respectively, and the front and rear portions of the bag body 2A are constituted by making them face each other. There is. On the other hand, the side surface portions 4 and 4 are formed by folding a rectangular film material in two, and are formed in a fold shape so that the folding lines 5 and 5 are provided in the center. They are arranged so as to face each other.
The side edges of the flat surface portions 3 and 3 and the side edges of the side surface portions 4 and 4 are heat-sealed to each other, and heat seal portions 6 and 6 are provided on both side portions of the bag body 2A.
Are formed. Also, with respect to the upper edge portion and the lower edge portion of the bag body 2A, the flat surface portions 3 and 3 and the side surface portions 4 and 4 are heat-sealed to form the upper heat seal portion 7 and the lower heat seal portion 8, respectively. ing. Thus, the flat surface portions 3 and 3 and the side surface portions 4 and 4 are heat-sealed to each other, and the bag body 2A is configured as an accommodating portion 10 for accommodating the inside thereof.

As the film material forming the flat surface portions 3 and 3 and the side surface portions 4 and 4, a laminated film formed by laminating a plurality of members is used. For example, the bag body 2
From outside of A, PET (12μ) / DL / Al (9μ) / DL / ON
(15μ) / DL / CPP (50μ) or PET (12μ) / DL / ON (15μ) / DL / Al
A laminated film of (9μ) / DL / CPP (50μ) is used.

As the outer layer, for example, a film made of a synthetic resin such as polyester, polyamide, polypropylene, polycarbonate or polyacetal can be used. Further, as these films, any of unstretched film or stretched film stretched in uniaxial direction or biaxial direction can be used. It should be noted that the thickness of the film may be any thickness as long as it can be maintained to a necessary minimum, and may be determined in consideration of cost and the like, and is not limited to the above-mentioned 12 μm, and is usually 1
It may be about 2 to 25 μm. Further, since the synthetic resin film used as the outer layer may be printed on the inner layer side, the synthetic resin film used is required to have printability, and is stretched uniaxially or biaxially. A stretched film may be used. If necessary, synthetic paper, cellophane, paper, non-woven fabric or the like can be used as appropriate.

On the other hand, examples of the inner layer include low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer. Polymer, ethylene-methyl acrylate copolymer, ethylene-methacrylic acid copolymer, polypropylene, ethylene-propylene copolymer, etc., one or more resins, or a resin-formed sheet. And the thickness is 3
0 to 200 μm is suitable.

Further, as the barrier layer, in addition to the aluminum foil layer, for example, a metal foil of iron, copper, tin or the like, or
Films such as polyethylene terephthalate, polyamide, polyvinyl chloride, polycarbonate, polyvinyl alcohol, saponified ethylene-vinyl acetate copolymer, or films coated with polyvinylidene chloride, or aluminum, silicon oxide, aluminum oxide, indium oxide, oxidized A film obtained by vapor deposition of an inorganic substance such as tin, zirconium oxide or magnesium oxide, or a film such as polyvinylidene chloride can be used.
Further, one or more of these base materials can be used in combination. In addition, as the thickness of this base material,
It is sufficient that the function required as a gusset bag can be satisfied, and can be appropriately selected as needed. The barrier layer secures gas barrier property, mechanical toughness, bending resistance, puncture resistance, impact resistance, abrasion resistance, cold resistance, heat resistance, and chemical resistance.

In order to secure the barrier property, instead of providing the aluminum foil layer as described above, a vapor deposition layer is provided as the outermost layer, and vapor deposition PET (12μ) / DL / ON (15μ) / DL /
A laminated film having CPP (50 μ) may be used.

As the vapor deposition layer, for example, aluminum, silicon oxide, aluminum oxide, indium oxide, tin oxide,
Zirconium oxide, magnesium oxide or the like is used.

On the other hand, the pour-out device 20 is a pour-out pipe 2 attached so as to be inserted into the bag body 2A from the upper edge thereof.
No. 1 and the upper portion of the spout pipe 21
And a cap 22 for sealing the spout of the. In this pour-out device 20, a pour-out pipe 21 is sandwiched between the upper edges of the flat parts 3 and 3, and the outer peripheral surface of the pour-out pipe 21 and the flat part 3, 3.
So that no gap is formed between the inner surface of 3 and
The heat seal portions 7 are in close contact with each other.

The heat-sealing portion 8 provided at the bottom of the bag body 2A is formed with a constant width along the lower edge of the bag body 2A with respect to the intermediate portion 8a. On the other hand, both side portions 8b, 8b of the heat seal portion 8 have their upper edges slantingly upward toward the heat seal portions 6, 6 on both sides so as to form a slanted boundary with the internal housing portion 10. Is extended,
It is formed in a triangular shape. For this reason, the lower portion of the housing portion 10 is formed so as to widen toward the upper side from the lower edge of the bag body 2A.

The accommodating portion 1 is provided at the bottom of the bag body 2A.
On the outer edge side from 0, folding assisting portions 11 and 11 for easily folding the bottom portion are provided. In addition, in the gusset bag 1A, the folding assisting portions 11, 11 are
However, at both side portions 8b, 8b of the heat seal portion 8, through holes are formed in the side surface portions 4, 4 which are heat-sealed and sandwiched by the flat surface portions 3, 3. The folding assisting portions 11 and 11 are formed in an elliptical shape, and the side surface portions 4 and 4 are formed such that their major axis directions extend to the left and right of the bag body 2A.
Is formed in. That is, the upper and lower outer edge portions of the folding assisting portions 11, 11 form a straight line extending in the left-right direction, while the outer edge portions at the left and right ends are formed in an arc shape. In this embodiment, as shown in FIG. 2, elliptical bending assisting portions 11 and 11 are formed only on the side surface portions 4 and 4, and the outside thereof is covered by the flat surface portions 3 and 3. Therefore, when viewed from the flat portions 3 and 3, the folding assisting portion 1
The flat parts 1 and 11 are hidden by the flat parts 3 and 3.

As shown in FIG. 3, the flattening portions 3 and 3 facing each other may be attached to each other by utilizing the bending assisting portions 11 and 11. This folding assist section 1
By also using 1 and 11 as the bonding portions of the flat surface portions 3 and 3, the edges of the side surface portion are cut out at the bottom of the bag body 2A, and the flat surfaces are bonded at the cut portions. The flat portions 3 and 3 can be integrated with each other without providing a separate bonding portion as in the conventional method.

Further, a fold line 12 extending to the left and right of the bag body 2A is formed on the bottom of the bag body 2A at a position corresponding to the bent portion of the bottom. This fold 1
2 is for determining the bending direction of the bottom portion, and FIG.
As shown in FIG.
The bag main body 2A is formed by pressing the bag main body 2A in a mold so that the third side becomes the concave portion 12a and the opposite side becomes the convex portion 12b. Although FIG. 1 shows a mode in which the fold line 12 is formed at the same position as the upper edges of the folding assisting parts 11, 11, the invention is not limited to this, and the bag body 2
In the vertical direction of A, it may be formed at any position as long as it is a range intersecting with the bending assisting portions 11, 11.

FIG. 5 shows a gusset bag 1 having the above construction.
About A, the state where the bottom part was bent is shown. The bottom of the bag body 2A has its rigidity reduced by the folding assisting portions 11, 11 formed on both left and right sides, and has a crease formed by the folds 12, so that it is easily bent and formed flat. . The fold line 12 has a concave portion 12a on one side of the bag body 2A and a convex portion 12b on the other side.
Therefore, the bottom portion is folded so that the surface formed in the recess 12a is located inside the folding. Then, once folded, the bottom of the bag body 2A is also prevented from returning to its original state due to the effect of the crease formed by the fold line 12, and the bag body 2A is maintained in a flat state. Thereby, high independence can be secured.

The portion forming the bending assisting portion 11 is not limited to the mode shown in FIG.

FIG. 6 is a view showing a mode of a portion where the bending assisting portion 11 is formed. In addition, in the aspect shown in FIG. 6, all the bending assisting portions 11 are
It is formed on the outer edge side of the bag main body 2A with respect to the storage portion 10 in which the contents are stored.

In FIG. 6 (a), elliptical through-holes 11a, 11a are formed only in both flat surface portions 3a, 3b to form a bending assisting portion 11, and the inner surface of each flat surface portion 3a, 3b is The state where the side surface portion 4 is heat-sealed is shown.

In FIG. 6B, the bending assisting portion 11 is formed by forming the elliptical through holes 11a, 11a only in the side surface portion 4. The bending assisting portion 11 has a through hole 11 on the side of the one flat surface portion 3a with the folding line 5 of the side surface portion 4 as a boundary.
It is provided by forming a. In this way, by forming the through hole 11a only on the one flat surface portion 3a side with the folding line 5 as the boundary and providing the folding assisting portion 11, the bottom portion of the bag body 2A is folded inward on the flat surface portion 3a side. Easy to bend in the direction of That is, by forming the bending assisting portion 11 in this way, the function of determining the bending direction to the direction of the arrow in the drawing is exhibited. The concave portion 1 of the fold line 12 described above
2a is a flat surface portion 3a on which the bending assisting portion 11 is formed.
If it is located on the side, the structure becomes easier to bend.

FIG. 6C shows a mode in which the elliptical through hole 11a is formed only in the one flat surface portion 3a and the bending assisting portion 11 is provided. Also in this case, the bag body 2
The bottom portion of A becomes easy to bend in the direction in which the side of the flat portion 3a is folded inward. That is, the function of determining the bending direction to the direction of the arrow is exhibited. Note that, also in this aspect, the concave portion 12a of the fold line 12 is formed into the flat surface portion 3a in which the through hole 11a forming the folding assisting portion 11 is formed.
If it is located on the side, the structure becomes easier to bend.

In FIG. 6 (d), one flat surface portion 3b and a portion 4b of the side surface portion 4 which is located closer to the other flat surface portion 3a than the folding line 5 formed in the center of the side surface portion 4 are oval-shaped. Through hole 1
The bending assisting portion 11 is formed by forming 1a and 11a, respectively. By thus forming the folding assisting portion 11 by arranging the through holes 11a, 11a so as to be asymmetrical with respect to the folding line 5, the bottom portion of the bag body 2A portion can be relatively easily bent to one flat portion side. . That is, it has the function of determining the bending direction in the direction of the arrow in the figure. Then, the concave portion 12a of the fold line 12 is replaced with the flat portion 3
If it is located on the b side, the bending ease can be improved by the synergistic effect of both.

In FIG. 6 (e), the fold line 5 formed on the side surface portion 4 is used as a boundary, and both the flat surface portion 3a located on one side and the portion 4a of the side surface portion 4 in the thickness direction of the bag body 2A. A bending assist portion 11 is formed by forming an oval through hole 11a.
Is provided. By arranging the through holes 11a in this way, the bottom of the bag body 2A can be relatively easily bent toward the one flat surface 3a. That is, it has the function of determining the bending direction in the direction of the arrow in the figure. Also in this aspect, the concave portion 12a of the fold line 12 is formed on the one flat surface portion 3
If it is located on the a side, the bending ease can be improved by the synergistic effect of both.

In FIG. 6 (f), with respect to the thickness direction of the bag body 2A with the fold line 5 formed on the side surface portion 4 as a boundary, both the flat surface portions 3a and 3b and the side surface portion 4 located on both sides. Oval through holes 11a, 11 for both 4a, 4b
A is formed and a bending assisting portion 11 is provided. As a result, a through hole is formed in the bag body 2A so as to penetrate in the thickness direction, and the rigidity at this position is reduced.

As described above, the through holes can be formed in at least one of the flat surface portion and the side surface portion to form various bending assisting portions. In addition, in the above-mentioned gusset bag, the case where the bending assist portion is formed by the elliptical through hole has been described, but the invention is not limited to this, and the bending assist portion is formed by the rectangular through hole or the circular through hole. May be formed.

[Second Embodiment] FIG. 7 shows a second embodiment of the present invention.
The front view of the gusset bag 1B concerning embodiment of this is shown.

This gusset bag 1B is also attached to a bag body 2B composed of a pair of opposed flat portions 3 and 3 and a pair of fold-shaped side portions 4 and 4, and to the upper edge of the bag body 2B. In addition, it is composed of a pouring pipe 21 and a pouring device 20 including a cap 22. Regarding the gusset bag 1B according to the second embodiment, the same components as those of the gusset bag 1A according to the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

Also in this gusset bag 1B, the folding assisting portions 30, 30 are provided on the left and right sides of the bottom of the bag body 2B at positions on the outer edge side of the accommodating portion 10. As shown in FIG. 8, the folding assisting portions 30, 30 have linear cuts extending to the left and right of the bag body 2B on both flat portions 3, 3 and crack propagation preventing portions provided at both ends thereof. It is provided.

As shown in FIG. 9, the bending assisting portion 30 has a linear portion 31 as a linear cut extending in the left and right directions.
And arc portions 32, 32 serving as crack propagation preventing portions, which are curved in an arc shape toward the lower side at both ends of the straight portion 31.
It consists of and.

The linear portion 31 is provided so as to coincide with the position where the fold line 12 is formed (see FIG. 7), and by synergistically exerting the functions of both, the bottom portion of the bag body 2B can be bent very easily. is doing. As shown in FIG. 10, the fold line 12 is formed by pressing the bag main body 2B into the mold so that the flat surface 3 side in the direction in which the bottom part is bent becomes the concave portion 12a and the opposite side becomes the convex portion 12b. It is formed. On the other hand, the arcuate portions 32, 32 are formed so as to be continuous with both ends of the linear portion 31 and curved downward of the bag body 2B. The edge portions 33, 33 of these arc portions 32, 32
Extends to a position where the extending direction of the tangent lines 45, 45 at each edge is perpendicular to the extending direction of the linear portion 31.

Bending assisting portion 30 formed in this way
In the gusset bag 1B having, the bottom portion of the bag body 2B is folded with the straight portion 31 of the folding assisting portion 30 as a base line. At the position where the straight line portion 31 is formed, the rigidity of the film material is reduced by the folding assisting portion 30 and the folding creases are formed by the folds 12, so that the bottom portion of the bag body 2B has a synergistic effect of both. Very easy to fold. Note that the folding direction is fold 1
It is determined by the direction in which the two concave portions 12a and the convex portions 12b are formed. That is, the bottom is folded in the direction in which the recess 12a side of the fold line 12 is folded inward. Further, once folded, the bottom of the bag body 2B is also prevented from being returned to its original state due to the effect of the creases formed by the folds 12, and the bag body 2B is maintained in a flat state. Thereby, high independence can be secured.

Further, the arcuate portions 32 and 32 as crack propagation preventing portions formed at both ends of the straight portion 31 effectively prevent the occurrence of cracks or the propagation of cracks from the bending assisting portion 30. ing. If the bending assisting portion 30 is formed by only the straight portion 31, bending of the bottom portion of the bag body 2B causes stress concentration at the end portion of the straight portion 31 and cracks develop from the end edge of the straight portion 31. May occur. However, like the bending assisting portion 30 according to this embodiment, the arcuate portions 32, 3 are provided at both ends of the linear portion 31.
Since the two are provided, the arc portions 32, 32 are effectively prevented from stress concentration. The arc portion 32,
There is a possibility that a crack may propagate from the edge portions 33, 33 of 32, but even if a crack occurs, this edge portion 3
Since the tangent lines 45, 45 at 3, 33 are directed to the lower side of the bag body 2B, the crack itself also propagates to the lower side of the bag,
It is prevented that the container 10 containing the contents is reached.

The bending assisting portion may be formed as shown in FIG. The folding assisting portion 30 shown in FIG. 11 is also a straight line portion 31 as a linear cut formed on the fold 12, and a crack propagation formed so as to curve downward from the bag body 2B from both ends of the straight edge portion 31. It is composed of arcuate portions 34, 34 as a prevention portion. Each arc part 3
4, 34 are tangents 46, 4 at the respective edge portions 35, 35.
The edge portions 35, 35 are circumferentially extended to a position where the angle θ formed by the straight line portion 31 and the extending direction of 6 becomes an acute angle.

Also in the bending assisting portion 30 shown in FIG. 11, the arcuate portions 34, 34 prevent the occurrence of stress concentration,
It effectively prevents the initiation and propagation of cracks.

Further, the folding assisting portion 30 is not limited to the linear cut formed by the continuous line, and may be formed by perforations as shown in FIG. Even when the folding assisting portion 30 is formed by perforations, the straight line portion 31a formed on the fold line 12 and the arcuate portion 36 formed so as to curve downward from the bag body 2B from both ends of the straight line portion 31a, And 36.

The positions where the edge portions 37, 37 of the arc portions 36, 36 are provided are tangential lines 47, 47 at the edge portions 37, 37.
And a direction in which the straight portion 31 extends are formed at right angles, or extend to a position where they are formed at an acute angle smaller than a right angle.

As described above, the linear cut is formed linearly and the crack propagation preventing portion is formed in an arc shape. However, the present invention is not limited to this.

In FIG. 13, the linear cut 38 is formed in an arc shape having a large curvature, while the crack propagation preventing portions 39, 39 are formed.
The mode of the bending auxiliary | assistant part 30 formed by hollowing out is shown. The arcuate linear cut 38 is formed so that its position substantially coincides with the position where the fold line 12 is formed. On the other hand, the crack propagation preventing portions 39, 39
At both ends of the linear cut 38, the linear cut 3
It is formed so as to be continuous with 8. Even when the folding assisting portion 30 is formed in this manner, the bag body 2B
The bottom part of the crack can be bent at the position of the linear cut 38, and the circular crack propagation preventing portions 39, 39 effectively prevent the generation and propagation of cracks.

Further, as shown in FIG. 14, a bending assisting portion 30 may be formed.

The bending assisting portion 30 shown in FIG.
A linear notch 40 formed in an arc shape having a large curvature,
It is composed of arcuate portions 41, 41 as crack propagation preventing portions formed at both ends of the linear cut 40. The circular arc portions 41, 41 as the crack propagation preventing portions are curved upward with respect to the linear cut 40. However, with respect to these edge portions 42, 42, they are circumferentially extended to a position where the tangent extends in the downward direction of the bag body 2B.

The above description has been made by taking as an example the mode in which the folding assisting portions are formed on both the flat surface portions 3 and 3. However, the second embodiment is also shown in FIGS. 15 (a) to 15 (f). As shown, at least one of the flat surface portions 3a and 3b or the side surface portion 4 can be provided with a folding assisting portion. Also in this case, FIG. 15B, FIG. 15C, and FIG.
As shown in (e), with respect to the thickness direction of the bag body, by forming the folding assisting portion 30 only on the flat surface portion 3a side on one side with respect to the folding line 5 formed on the side surface portion 4, the folding direction of the bottom portion Can be used as a means for determining. In addition, as shown in FIG.
d and the flat surface portion 3a of the side surface portion 4 which is on the other side of the folding line 5
By providing the folding assisting portion 30 on the side portion 4a, that is, by forming the folding assisting portion 30 so as to be asymmetrical with respect to the folding line 5 in the thickness direction of the bag body, it is possible to function as a means for determining the folding direction of the bottom portion. You can

[Third Embodiment] FIG. 16 is a plan view of a gusset bag IC according to a third embodiment of the present invention.

This gusset bag 1C is also attached to the bag body 2C composed of a pair of opposed flat portions 3 and 3 and a pair of folded side surfaces 4 and 4, and to the upper edge of the bag body 2C. In addition, it is composed of a pouring pipe 21 and a pouring device 20 including a cap 22. Regarding the gusset bag 1C according to the third embodiment, the first embodiment and the second embodiment
The same components as those in the gusset bag 1C according to the embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The folding assisting parts 50, 50 are provided in the bag body 2C.
It is provided on the left and right sides of the bottom of the housing at positions on the outer edge side of the housing portion 10. As shown in FIGS. 16 and 17, the folding assisting portions 50, 50 are provided on the flat portions 3, 3 at positions corresponding to both side portions 8b, 8b of the heat seal portion 8.
Is provided by forming a rough surface portion on the surface. As for the fold line 12, as shown in FIG. 18, the flat surface 3 side in the direction in which the bottom of the bag body 2C is bent is the recess 12a,
The bag main body 2C is formed by pressing the bag main body 2C in a mold so that the opposite side thereof becomes the convex portion 12b.

The rough surface portion which is the bending assisting portion 50, 50 is an aggregate of a plurality of fine holes, and as shown in FIG. 19, the PET outside the aluminum foil layer 71 which is a barrier layer.
The layer 70 is formed by forming a plurality of fine non-through holes. The folding assisting portions 50, 50 have, for example, a predetermined rough sandpaper attached to the surface of the pressing roller,
It is formed by feeding a film material to the pressing roller and pressing sandpaper on the surface thereof. In addition, regarding this FIG. 19, 70 is a PET layer, 71 is an aluminum foil layer, 7
2 is an ON layer and 73 is a CCP layer.

As described above, the bending assisting portion 5 is formed on the rough surface portion.
Even when 0 and 50 are formed, this bending assisting portion 5
The rigidity of the position where 0 and 50 are formed is reduced, and the bottom of the bag body 2C can be easily bent at this position. In addition, the fold 1
Since the folding habit is formed by 2, the bottom portion of the bag body 2C can be bent very easily due to the synergistic effect of the folding line and the folding assisting portions 50, 50. It should be noted that the folding direction is the recess 12a of the fold 12,
It is determined by the direction in which the protrusion 12b is formed. That is,
The bottom of the bag body 12C is folded in the direction in which the recess 12a side of the fold line 12 is folded inward. Further, once folded, the bottom of the bag body 2C is also prevented from returning to its original state due to the effect of the crease formed by the fold, and the bag body 2C is maintained in a flat state. Thereby, high independence can be secured.

When the outer layer is vapor-deposited PET,
As shown in FIG. 20, the bending assisting portions 50A and 50A may be formed by holes that reach not only the outer layer but also the inner layer thereof, or holes that penetrate. In the film material using the aluminum foil layer, the rough surface portion may be formed by non-through holes or through holes reaching the inner layer from the aluminum foil layer. Even if a fine hole is formed so as to penetrate the film material in this manner, since the folding assisting portions 50, 50 are provided on the outer edge side of the accommodating portion, there is no fear of adversely affecting the contents. Note that regarding FIG. 20, 7
Reference numeral 4 represents a vapor deposited PET layer, 72 represents an ON layer, and 73 represents a CCP layer.

Although the above description has been made by taking as an example the mode in which the folding assisting portions are formed on both the flat portions 3 and 3, the third embodiment is also shown in FIGS. 21 (a) to 21 (f). As shown, at least one of the flat surface portions 3a and 3b or the side surface portion 4 can be provided with a folding assisting portion. Also in this case, FIG. 21 (b), FIG. 21 (c), and FIG.
As shown in (e), with respect to the thickness direction of the bag body, by forming the folding assisting portion 50 only on the flat surface portion 3a side on one side with respect to the folding line 5 formed on the side surface portion 4, the bending direction of the bottom portion Can be used as a means for determining. Further, as shown in FIG. 21D, one flat surface portion 3
b and the flat surface portion 3a of the side surface portion 4 which is on the other side of the folding line 5
By providing the folding assisting portion 30 on the side portion 4a, that is, by forming the folding assisting portion 30 so as to be asymmetrical with respect to the folding line 5 in the thickness direction of the bag body, it is possible to function as a means for determining the folding direction of the bottom portion. You can

When forming the folding assisting portion on any of the flat surface portion 3 and the side surface portion 4, the roughening process is performed from the outer layer side of each film material.

As described above, in the first to third embodiments, the folding assisting portion is formed in a triangular shape on both side portions 8b and 8b of the heat seal portion 8 which seals the lower edge portion of the bag body. Although the description has been given by taking the mode provided in the above portion as an example, the present invention is not limited to this. For example, the same both side portions 8b, 8b
However, it may be provided at a position corresponding to the lower end of the accommodating portion 10 or below the same. Further, it is not limited to being provided separately on both the left and right sides, and it may be provided at the intermediate portion 8 a of the heat seal portion 8 or may be provided over the entire area of the heat seal portion 8.

In addition, these folding assisting portions are formed by sticking a film material configured as the flat surface portion 3 and a film material configured as the side surface portion 4 provided as a separate body to the bag main body. What is formed, and one of which is a back seal type in which a flat surface portion 3 and a side surface portion 4 are formed by folding a piece of film material and the side edges of the film material are bonded together, and can be applied to any gusset bag You can

[0066]

As described above, according to the present invention, the bottom portion of the bag body can be bent very easily, and the bent state can be surely maintained. As a result, the bottom of the bag body can be flattened and stable independence is ensured.

Further, it is possible to prevent a crack from being generated or propagated from the bending assisting portion.

A gusset bag having a good appearance can be obtained by adopting a constitution in which the folding assisting portion is formed only on the side surface portion and the folding assisting portion is concealed by the flat portion.

[Brief description of drawings]

FIG. 1 is a plan view of a gusset bag according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing a II-II cross section of FIG.

FIG. 3 is an enlarged cross-sectional view showing a cross section taken along the line II-II in FIG. 1, showing an embodiment in which the bending assisting portion functions as a bonding portion.

4 is an enlarged cross-sectional view showing a III-III cross section of FIG.

FIG. 5 is a perspective view of the gusset bag in which the bottom surface is bent as viewed from the bottom.

FIG. 6 is a list view summarizing modes of a bending assisting portion.

FIG. 7 is a plan view of the gusset bag according to the second embodiment of the present invention.

8 is an enlarged cross-sectional view showing a VIII-VIII cross section of FIG. 7.

9 is a view showing one mode of a folding assisting portion formed on the gusset bag shown in FIG.

10 is an enlarged cross-sectional view showing the XX cross section of FIG.

FIG. 11 is a view showing a bending assisting portion in a different mode from the bending assisting portion shown in FIG.

FIG. 12 is a view showing a bending assisting portion formed by perforations.

FIG. 13 is a view showing a bending assisting portion formed by forming a linear cut in an arc shape and hollowing out a crack propagation preventing portion in a circular shape.

FIG. 14 is a diagram showing a bending assisting portion in a state where the crack propagation preventing portion is curved upward.

FIG. 15 is a list view summarizing modes of a bending assisting portion.

FIG. 16 is a plan view of the gusset bag according to the third embodiment of the present invention.

17 is an enlarged cross-sectional view showing the XVII-XVII cross section of FIG.

FIG. 18 is an enlarged cross-sectional view showing a XVIII-XVIII cross section of FIG. 16;

FIG. 19 is an enlarged cross-sectional view of a portion where a bending assist portion is formed.

FIG. 20 is an enlarged cross-sectional view of a portion in which a bending assisting portion having a different form from FIG. 19 is formed.

FIG. 21 is a list view summarizing modes of a bending assisting portion.

[Explanation of symbols]

1A, 1B, 1C Gazette bag 2A, 2B, 2C Bag body 3,3a, 3b Plane part 4 side parts 5 fold lines 6,7,8 Heat seal part 10 accommodation 11,30,50,50A Bending auxiliary part 12 folds 20 dispenser 31 Straight part (linear cut) 32, 34, 36, 41 arc part (crack propagation prevention part)

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 2001-199452 (JP, A) JP 5-16946 (JP, A) Actual development Sho 53-164522 (JP, U) Actual development Sho 48-112717 (JP, U) S. 61-3798 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) B65D 30/00-33/38

Claims (2)

(57) [Claims] 1. A pair of side surfaces, which are formed in the shape of a fold and are folded inward so that the fold lines correspond to each other, and the side edges of the flat portions are connected to each other. In a gusset bag having a portion, a bending assisting portion that bends the bottom portion of the gusset bag to easily form a flat surface is formed at the bottom of the gusset bag on the outer edge side of the storage portion in which the contents are stored. , This folding assist part reduces the wall thickness of this gusset bag.
Is a recess that is formed in the side surface.
And the flat part is attached to this side part.
The through hole formed in the side surface portion is hidden by the flat surface portion.
Gazette bag characterized by being covered. 2. A pair of flat parts facing each other and a fold shape.
Fold inward so that the fold lines correspond to each other
Four ridge lines formed by the flat surface portion and the side surface portion, which have a pair of side surface portions inserted therein.
Heat seal the inner surfaces of the
While heat-sealing the upper and lower edges of the cylindrical body of
Heat-sealed bottom edge and heat-sealed front
The inner surface of the flat surface portion and the inner surface of the side surface portion are connected so as to connect the ridge line.
Heat seal each one with the person and the triangular seal part
In the formed gusset bag, in front of at least one of these triangular seal parts
The flat part and the side part are connected to the heat-sealed seal part.
And bend the bottom of the gusset bag to make a flat surface easier
Is formed on the side surface portion of the through hole formed in the side surface portion.
And the long axis direction of this through hole is the bottom of this gusset bag.
Formed in the same direction as the folding line
Is, the folding auxiliary portion is concealed by the planar portion
Gazette bag characterized by that.