JPH0585550A - Gazette bag - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a gusset bag capable of preventing bag breakage from the folding intersection located at the bottom. [Constitution] The folds on both sides of the tubular soft wrapping material 2,
In the state where 2 is formed, a linear adhesive portion 3 is formed at one end,
A straight line portion α which is spaced a predetermined distance from the adhesive portion 3 toward the inner side.
The area including the adhesive portion 3 is folded back with and fixed with tape 5,
Fold the intersection of the straight line part α and the folds 2 and 2 into the intersection A,
As B, the lower part of the folds 2 and 2 is spread out in a triangular shape to form a bottom. Folding intersection points A and B when contents are inserted
Since external force is not directly applied to the external force, the external force is dispersed, so that bag breakage can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gusset bag used for packaging.

[0002]

2. Description of the Related Art Heretofore, as one form of a packaging bag, there has been known a gusset bag 11 as shown in FIG. 9 in which pleats are provided on both side surfaces of a body and the bottom is assembled into a square bottom shape.
Paper or a plastic film is used as the packaging material, and in particular, a gusset bag made of the plastic film is used for storing a liquid.

[0003]

However, in the gusset bag 11 mentioned in the prior art, the folds 12, 12 are defined as the fold intersections C, D at the intersections between the folded tips of the folds 12, 12 and the adhesive portion 13 at the bottom. Since the square bottom is formed by pushing the lower part of the triangle in a triangular shape, as shown in the bottom top view of FIG. 10 and the bottom bottom view of FIG. 11, the folding intersections C and D are the boundary lines of the bonding portion 13. When there is a large amount of content to be pulled in the direction of the arrow or to be stored in the gusset bag 11, a large force is directly applied to the fold intersection points C and D and the bottom portion is ruptured from the adhesive portion 13. there were. In particular, when the liquid is filled in the gusset bag 11 made of a plastic film, there is a problem that when the filling amount becomes large, the bag is broken from the folding intersection points C and D to cause liquid leakage. .

The present invention has been made in view of the above problems, and an object of the present invention is to provide a gusset bag capable of preventing bag breakage from a folding intersection located at the bottom. is there.

[0005]

In order to achieve the above object, the gusset bag of the present invention has a tubular soft wrapping material in which one end is folded in a V shape to form a fold. The portion is closed with a linear adhesive portion, and the region including the adhesive portion is folded back and fixed by a linear portion that is spaced inward from the adhesive portion by a predetermined distance, and the intersection point of this linear portion and the fold is folded. The bottom is formed by pushing the lower part of the fold into a triangular shape.

[0006]

In the gusset bag having the above structure, the folding intersection and the adhesive portion are separated from each other, and even if the content is large, external force is not directly applied to the folding intersection.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an opened state of a gusset bag according to an embodiment of the present invention. The gusset bag 1 of this embodiment is made by using a plastic film formed into a tube shape by an inflation method.

In order to form this film into the shape shown in FIG. 1, first, as shown in FIG. 2, both side portions of the tubular film are folded into V-shapes having folds a and b at the tips, and pleats 2 are formed. 2 is attached, and in this state, one end is linearly sealed to form the adhesive portion 3. Then, the region 4 including the adhesive portion 3 is folded back at a straight line portion α which is spaced inward from the adhesive portion 3 by a predetermined distance, and is fixed by an adhesive tape 5 as shown in FIG. Next, the intersections of the straight line portion α and the folds a and b of the folds 2 and 2 are set as vertices, that is, the folding intersection points A and B, and the lower portions of the folds 2 and 2 are spread in a triangular shape to form a quadrangular bottom. To have a shape as shown in FIG. The bottom formed in this way is as shown in FIG. 5 when viewed from above and as shown in FIG. 6 when viewed from below.

In the gusset bag 1 (in the state shown in FIG. 1) in which the quadrangular bottom portion is formed as described above, the upper portion of the folds a and b above the triangular portion is folded into a V shape. At the same time, the diagonal folds c and d on both sides are valley-folded, the lateral folds e on both sides are mountain-folded, and the lateral fold f on the rear is formed.
By making a valley fold, the bag is made into a folded state and the bag making is completed.

The gusset bag 1 having the above structure is used as an inner bag of a bag-in-box, for example. In this case, the folded gusset bag 1 is raised in the shape of FIG. 1 in a cardboard box or the like. Then, when the liquid such as a beverage is filled and the amount thereof is increased, the bag receives a force in a direction of spreading to the surroundings, but since the folding intersection points A and B are separated from the adhesive portion 3,
No force is directly applied to this part. That is, since it acts so as to act on the adhesive portion 3, the liquid does not leak due to the bag breaking from the folding intersection as in the conventional gusset bag.

When the gusset bag 1 having the above structure is viewed from the side, there is a gap at the bottom as shown in FIG. Therefore, if there is a large gap between the gusset bag 1 and the cardboard box, or if the gusset bag 1 is used without being put in the cardboard box, the gusset bag 1 side increases as the liquid filling amount increases. The part expands and the folding intersections A and B are displaced and come into contact with the adhesive part 3, and the bag may be broken from this part. Therefore, when raised to the shape shown in FIG. 1, it is preferable that the bottom surface and the side surface are bonded with a tape 6 for reinforcement. By doing this, the shape of the bottom is constant,
Since the folding intersections A and B are prevented from being displaced, there is no fear of bag breakage even if a large amount of liquid is filled.

In the above embodiments, the present invention has been described as being applied to a liquid film gusset bag made of a plastic film, but it is of course also applicable to a gusset bag made of another material such as paper. It is possible.

[0014]

As described above, in the gusset bag of the present invention, since the bottom portion is formed with the folding intersection point separated from the adhesive portion, external force is directly applied to the folding intersection point when contents are put therein. Since the external force applied to the bottom portion is dispersed without causing the bag to break, it is possible to prevent the bag from breaking during use.

[Brief description of drawings]

FIG. 1 is a perspective view showing an opened state of a gusset bag according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a state in which an adhesive portion is formed at one end of the tubular film with pleats on both sides.

FIG. 3 is an explanatory diagram showing a state in which a region including an adhesive portion is folded back along a straight line portion.

FIG. 4 is an explanatory view showing a state in which a folded back portion is fixed.

5 is a top view of the bottom of the gusset bag shown in FIG. 1. FIG.

6 is a bottom view of the bottom portion of the gusset bag shown in FIG. 1. FIG.

7 is a side view of the gusset bag shown in FIG. 1. FIG.

FIG. 8 is a side view showing a state in which a bottom surface and side surfaces are reinforced with tape.

FIG. 9 is a perspective view showing a state in which a conventional gusset bag is opened.

FIG. 10 is a top view of the bottom portion of the gusset bag shown in FIG.

11 is a bottom view of the bottom portion of the gusset bag shown in FIG. 9. FIG.

[Explanation of symbols]

 1 Gazette bag 2 Fold 3 Adhesive A, B Intersection point α Straight line

Claims (1)

[Claims] 1. A tubular soft wrapping material having both ends folded in a V shape to form pleats, one end of which is closed by a linear adhesive portion, and a predetermined inner portion is provided from the adhesive portion. The region including the adhesive portion is folded back and fixed by a straight line portion with a space, and the bottom portion is formed by pushing the lower part of the fold into a triangular shape with the intersection point of this straight line portion and the fold point as the folding intersection point. And a gazette bag.