JPH0872897A - Gusset bag and opening method thereof - Google Patents

Abstract

PURPOSE: To obtain a gusset bag which is convenient for uncealing and extraction of its contents and whose top is satisfactorily sealable, and a gusset bag which is convenient for discharge of contents, and achieve the formation of a spout which is convenient when these gusset bags are used. CONSTITUTION: A gusset bag has, a pair of flat parts 10, opposite each other, which compose the front and rear of the bag, two pleat-like sides 30, each having a valley-fold line 20, and triangular side-folded parts 6, which are made by reversely folding part of each side 30 on a bag top side. Also, the bag has an area where the opposite insides of the pair of flat parts 10 can be directly fusion-bonded inward from at least one side of the opening edge 80 on the top side. By cutting off an apex 90 made to project from the side of the bag by pulling the side-folded part 60 outward, it can be used as a convenient spout.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gusset bag which is convenient for opening and taking out the contents and has a good sealing property at the top, a gusset bag which is convenient for pouring out the contents after opening, and an opening of the gusset bag. Regarding the method.

[0002]

2. Description of the Related Art Gusseted bags having so-called "gussets" on both sides of the bag are widely used because they are self-supporting and excellent in capacity. However, the top portion of such a gusset bag has a peculiar shape having a fold formed by folding the gusset, as shown in FIG. It was also inconvenient to take out the contents, especially to take out by pouring. Further, when manufacturing such a gusset bag, with the gusset having a valley fold line folded inwardly protruding between the bag front surface and the bag rear surface, the bag front surface is held. Since the seal portion of the bag front gusset and the seal portion of the bag rear surface and the bag rear gusset are overlapped to seal the two seal portions at the same time, there is also a problem that a sealing failure easily occurs.

[0003]

In view of the above situation, the present inventor has earnestly studied for the purpose of developing a gusset bag which is convenient for opening and taking out the contents and has a good top sealability. Completed the achievable gusset bag. Furthermore, the present inventor found that the side fold portion provided in the gusset bag developed through such circumstances can be utilized as a surprisingly convenient spout, and completed a useful gusset bag opening method. The gusset bag that was developed was also improved to complete a gusset bag that is convenient for pouring out the contents.

That is, an object of the present invention is to provide a gusset bag which is convenient for opening and taking out the contents and has a good sealing property at the top, and secondly, a gusset bag which is convenient for pouring out the contents after opening. And thirdly to provide a method for opening a gusset bag that can form a convenient spout.

[0005]

In order to solve the above-mentioned first problem, the first invention of the present invention is: (a) a pair of opposed flat portions forming a front side and a back side of a bag; Bag main body part of three-side seal having two side surface parts formed so as to have valley fold lines folded inwardly, and a top side opening part, and (b-1) top part side of the bag main body part In, at least one of the side surface portions is bent in a direction opposite to the original folding direction to fold the side surface portions so that a part of the side surface portion is pulled outward and a mountain fold line is formed. A triangular side-face folded portion formed by sealing the portion, (c) the bag body portion has a fusion-sealing surface on the inner surface of the top-side opening end,
(D-1) The region from at least one side surface side of the top side opening end portion to the inside is a gusset bag so that the facing inner surfaces of the pair of flat surface portions can be directly fused to each other,
Preferably, (b-1) is configured to have (b-2) side surface folding parts on both side surfaces on the top side of the bag body, and (d-1) is (d-2) top. The entire area of the side opening end portion was configured such that the facing inner surfaces of the pair of flat surface portions could be directly fused to each other.

In order to solve the second problem,
A second aspect of the present invention is (a) a pair of opposing flat portions that form the front side and the back side of the bag, and two valley fold lines that are folded inward in a fold-like shape. At the side of the bag, the bag main body of the three-sided seal having the opening on the top side, and (b-1) at the top of the bag main body, the valley fold line of at least one side is opposite to the original folding direction. By folding and folding in a part of the side surface portion to the outside and forming a mountain fold line, and further having a triangular side surface folding portion formed by sealing the side surface side open end, ( c) The bag body has a fusion-sealing surface on the inner surface of the top-side opening end, and (e) at least one of the side-face folds has a side-side edge having a side-side open-end seal and the side-face fold. Mountain fold line provided in the section There eggplant interior angle constituted the gusset bag to be less than 90 ° in a folded state the bag body portion.

As another means for solving the above-mentioned second problem, the third invention of the present invention is: (a) a pair of opposed flat portions constituting the front side and the back side of the bag, in the shape of a fold. A bag body part of a three-way seal having two side surface parts formed so as to have valley fold lines folded inward and a top side opening part, and (b-1) on the top part side of the bag body part, By bending the valley fold line of at least one side surface portion in a direction opposite to the original folding direction and folding it, a part of the side surface portion is pulled outward and a mountain fold line is formed. A side surface folding portion formed in a triangular shape by sealing, and (c) the bag body portion has a fusion sealing surface on the inner surface of the top-side opening end portion,
(F) In at least one of the side folds, an apex on the opening side of the side fold line before forming the mountain fold line has an apex on the mountain fold line side of the side fold line and a side face side end having a seal portion. The gusset bag was formed so as to be the top sandwiched between and.

In order to solve the above-mentioned third problem, the fourth invention of the present invention is: (g) a pair of opposed flat portions forming the front side and the back side of the bag, and a fold-shaped inner portion. A bag body part of a four-sided seal having two side surface parts formed so as to have a valley fold line folded in one direction, and (h) a valley fold line of at least one side surface part on the top side of the bag body part. Is folded in the direction opposite to the original folding direction to pull out a part of the side surface portion outward, form a mountain fold line, and seal the side opening end to form a triangular shape. A method for opening a gusset bag having a side fold portion, wherein (i) at least one side fold portion of the gusset bag is pulled outward to project from a side surface of the gusset bag, and the pulled-out side fold portion is piled up. It was constructed unsealing method gusset bag to cut vertex portion sandwiched between the side surface-side edge with Ri line-side edge and the sealing portion.

[0009]

According to the first aspect of the present invention, on the top side of the bag body, at least one of the side surface portions is outwardly bent by folding the valley fold line of the side surface portion in a direction opposite to the original folding direction. Since the mountain fold line is formed while being pulled out, the facing inner surfaces of the pair of flat portions can be directly fused to each other in the region extending from at least one side surface side to the inner side of the top side opening end portion. As a result, the folds of the gusset do not exist on at least one side surface side of the top portion of the gusset bag, and the folds do not interfere when opening the package or taking out the contents. Therefore, at the time of opening, the opening portion of the top of the gusset bag is easily pinched and can be easily opened, and at the time of taking out the contents, it is easy to take out and is unlikely to spill, which is particularly convenient for taking out by pouring.

Further, according to the first aspect of the invention, in at least one side surface side of the top side opening end portion to the inside, sealing is performed without sandwiching the gusset between the bag front surface portion and the bag rear surface portion. It is unlikely that a defective seal will occur at such a seal portion.

On the top side of the bag body, the valley fold line is reversely folded back on both side surfaces so that a part of the fold line is pulled outward and a mountain fold line is formed. It is possible to have side surface folding portions on both side surfaces and to directly fuse the facing inner surfaces of the pair of flat surface portions in the entire area of the top side opening end portion. Then, by doing so, the ease of opening, the ease of taking out the contents, and the sealing property can be further improved.

According to a second aspect of the present invention, in at least one of the side surface folding portions in the folded state of the bag main body portion, the side surface side edge having the side surface side opening end seal portion and the mountain folding portion provided on the side surface folding portion. Since the inner angle formed by the line is set to less than 90 °, it becomes easy to pull out the side surface folding portion of the gusset bag to the outside so as to project from the side surface of the gusset bag. As a result, it becomes particularly convenient when the gusset bag is opened by the method described in the fourth invention described later, and the pouring out of the contents becomes easier and more convenient.

According to a third aspect of the present invention, at least one of the side folds of the gusset bag is provided with an apex on the side of the valley fold line on the side of the opening before the mountain fold line is formed. Since it is formed so as to be an apex sandwiched between the side edge having the seal portion and the side edge having the sealing portion, the side surface folding portion of the gusset bag is pulled out and projected from the side surface of the gusset bag as in the second invention. It will be easy. As a result, it becomes particularly convenient when the gusset bag is opened by the method described in the fourth invention described later, and the pouring out of the contents becomes easier and more convenient.

According to a fourth aspect of the present invention, at least one side surface folding portion of a gusset bag having a triangular side surface folding portion at the top of the bag body is pulled outward to project from the side surface of the gusset bag, and the side surface folding portion is pulled out. Since the apex portion sandwiched between the mountain fold line side edge and the side surface side edge having the seal portion is cut, the side surface folded portion can be utilized as a convenient spout.

[0015]

EXAMPLE One embodiment of the gusset bag of the present invention is shown in FIGS. 1 is a front view and FIG. 2 is a perspective view.
With reference to these figures, the gusset bag A of the present invention will be described.
Is a pair of opposed flat portions 10 and 10 that form the front side and the back side of the bag, and the valley fold line 2 folded inward in a fold shape.
Two side portions 30, 30, formed to include
And a three-sided sealed bag body having a top opening 40, and a triangular side-faced fold 60 on at least one side of the bag body top. 1 and 2, the side surface folding portions 60 are provided on both sides of the bag body. Then, the side surface folding portion 6
In order to make it easier to understand 0, the side surface folding part 6 on one side
0 is drawn from the side of the gusset bag.

The bag body and the side folds are generally composed of a plastic film, paper, aluminum foil or a laminate in which these are appropriately combined, but the material and thickness are not particularly limited. Further, the capacity and dimensions are not particularly limited. In this example, a gusset bag having a capacity of 500 ml and an inner bag size of 9 cm (width) × 6 cm (gusset width) × 23 cm (height) was prepared.

The side fold portion 60 has a valley fold line 20 on at least one side surface portion 10 on the top side of the bag body.
Is folded and folded in the opposite direction to the original folding direction to pull out a part of the side surface portion outwardly and form a mountain fold line 50, and further seal the side surface side opening end portion to seal the side surface side opening end seal. It is formed by providing the portion 70.

The side surface folding portion 60 secures a region Q where the facing inner surfaces of the pair of flat surface portions 10 and 10 can be directly fused from at least one side surface side of the top side opening end portion 80 to the inside. Is formed for. Therefore,
The side surface folding portion 60 may be formed only on one side of the gusset bag as shown in 3-1 of FIG. 3, or may be formed at the top end of the gusset bag as shown in 3-2 of FIG. Normally Figure 1
As described above, a sufficiently wide area Q is secured by forming the side surface folding portions 60 on both sides of the gusset bag and at a position slightly lower than the top end.

Although the side folds 60 may be provided on the bottom side of the gusset bag, in that case, the self-supporting property of the bag is lost. The gusset bag of the present invention described above is in the form of a final product in which the top opening 40 is sealed after filling the contents, and which is sealed in four directions. When opening the gusset bag of the present invention in the state of the final product, it can be easily opened by cutting or tearing off the unfolded seal portion (area Q) on at least one side of the bag top, It is convenient for taking out the contents, especially for pouring. Further, 4-1 to 4 in FIG.
-3, the side folds 60 are pulled outward to project from the side of the bag (Fig. 4-1), and the apex including the pulled apex 90 is cut to form the opening 92. (FIG. 4-2) makes it possible to utilize the side surface folding portion 60 as a convenient spout (FIG. 4-3).

When the side-face folded portion 60 is used as a spout, it is required that the side-face folded portion 60 can be easily pulled out and that the side-face folded portion 60 can be sufficiently projected from the side surface of the bag. In order to meet such a requirement, the inner angle P formed by the side edge of the side folded portion 60 having the side opening end seal portion 70 and the mountain fold line 50 is as sharp as possible when the bag body is folded. You can do it like this. Specifically, the side folds 60 should be formed so that the interior angle P is less than 90 °, and more preferably 80 ° or less.

However, from the viewpoint of manufacturing efficiency, normally, the side surface-side opening end seal portion 70 of the side surface folding portion seals the side surface-side opening end of the side surface folding portion along the side of the flat surface portion 30, and then, It is formed by cutting the part protruding from the side surface part. When such a manufacturing process is performed, the apex 90 sandwiched between the side edge of the side folded portion on the mountain fold line 20 side and the side edge of the side opening having the side opening end seal portion 70 is located inside the side seal portion 110. The inner angle P cannot be made so acute that it is located at. In such a case, as shown in FIG. 5, the opening-side apex 120 of the side-face valley fold line 20 before the mountain-fold line is formed is exactly the mountain-fold line-side edge of the side-face folded portion and the seal portion. The side surface portion may be folded back so as to form the apex 90 sandwiched between the side edge portion having the edge. By doing so, the inner angle P can be most acute under the constraint of the manufacturing process.

When it is not intended to positively utilize the side face folded portion 60 as a spout, it is preferable that the interior angle P is 90 ° or more from the viewpoint of manufacturing efficiency. In addition, as shown in 3-3 of FIG. 3, one of the side face folded portions 60 on both sides of the gusset bag has the interior angle P of 9
It may be formed to be 0 ° or more and the other one may be formed so that the internal angle P is less than 90 °.

The gusset bag A of the present invention shown in FIG. 1 is manufactured through the following steps. First, a bag body as shown in FIG. 6 is prepared. The bag main body portion has two side surface portions formed so as to include a pair of opposed flat surface portions 10 and 10 that form the front side and the back side of the bag and a valley fold line 20 that is folded inward in a fold shape. 30 and 30, a bottom seal portion (not shown), and four corner positions at the top-side opening end, that is, from the top end of each joint portion between the flat surface portions 10 and 10 of the bag body portion and the side surface portions 30 and 30. Notches 150, 150, 150, 150 at depths up to a predetermined distance
Have. The cuts have approximately the same depth. The bottom seal portion may be formed in a later manufacturing process.

By making the above-mentioned notch 150, the side face folded portion 60 can be formed at a position slightly lower than the top end of the gusset bag. As a result, a region Q in which the facing inner surfaces of the pair of flat surface portions 10 and 10 can be directly fused to each other is secured from at least one side surface side of the top-side open end portion 80 of the gusset bag to the inside, and The interior angle P formed by the side edge of the side folded portion 60 having the side opening end seal portion 70 and the mountain fold line 50 can be set to an appropriate acute angle when the bag body is folded.

When it is desired to form the side surface folding portion 60 only on one side of the gusset bag, the above-described cutting processing and the folding processing described below may be performed on only one side. Further, when it is desired to form the side face folded portion 60 at the top end of the gusset bag, only the folding process described below may be performed without performing the above-described cutting process.

Then, as shown in FIG. 7, arbitrary arbitrary points M and M existing on the valley fold lines 20 and 20 of the two side surface portions 30 and 30 are set as base points, and the valleys from the base points M and M are set. The valley fold lines up to the tops 120, 120 of the fold lines are bent in the direction opposite to the original folding direction, and the mountain fold lines 50, 50 are pulled out and folded. Due to this folding, the notches 150 at the four corners of the bag body are inevitably produced.
The fold lines connecting the end portion 160 of the to the base point M are formed as four ridge lines 170 that are convex inside the bag.

Next, as shown in 8-1 of FIG. 8, the bag main body is folded, and as shown in 8-2 of FIG. A seal is provided along the side edge to provide a side surface side open end seal portion 70.

At this time, at the same time, the side opening end seal portion 7 is formed.
The side end on the top side of 0 is also sealed, and the side seal part 110 near the top opening 40 is provided. And finally, Figure 8
8-3, the part 200 protruding from the bag body is cut. The gusset bag A of the present invention is completed through the above steps.

[0029]

According to the first aspect of the present invention, since the folds of the gusset do not exist on at least one side surface side of the top of the gusset bag, the folds do not interfere when opening or taking out the contents. Therefore, it becomes easy to open the package, and it becomes easy and convenient to take out the contents, especially by pouring. Moreover, poor sealing at the top-side opening end is unlikely to occur.

According to the second and third inventions of the present invention,
Since it becomes easy to pull out the side surface folding portion of the gusset bag to the outside so as to project from the side surface of the gusset bag, it is convenient when utilizing the side surface folding portion as a spout.

According to the fourth aspect of the present invention, it is possible to utilize the side surface folded portion of the gusset bag as a convenient spout.

[Brief description of drawings]

FIG. 1 is a front view showing an aspect of a gusset bag of the present invention.

FIG. 2 is a perspective view showing an aspect of a gusset bag of the present invention.

FIG. 3A to FIG. 3C are schematic views showing another forming manner of the side surface folding portion.

FIG. 4A is a schematic diagram showing a state in which a side surface folding portion is pulled out from a side surface of a gusset bag, and FIG. 4-2 is a schematic diagram showing a state in which a top portion of the side surface folding portion is cut and opened. FIG. 4-3 is a schematic view showing a state where the contents are being poured out from the opening.

FIG. 5 is a schematic view showing the adjustment of the side folds required to manufacture the gusset bags of the second and third inventions.

FIG. 6 is a schematic perspective view showing one step of a manufacturing process of the gusset bag of the present invention.

FIG. 7 is a schematic perspective view showing one step of the manufacturing process of the gusset bag of the present invention.

8A, 8B, and 8C are schematic front views showing one step of the manufacturing process of the gusset bag of the present invention, particularly the step of forming the side folds.

FIG. 9 is a perspective view showing a conventional gusset bag.

[Explanation of Codes] 10 ... Plane part 20 ... Valley fold line 30 ... Side part 40 ... Top opening 50 ... Mountain fold line 60 ... Side fold part 70 ... Side opening end sealing part 80 ... Top opening end 90 ... Apex 92 sandwiched between the mountain fold line side edge of the side face folded portion and the side face side edge having the side face side opening end seal portion 92 ... Opening port 110 ... Side face seal portion 120 ... Side face portion before forming the mountain fold line Opening-side apex of the valley fold line 150 ... Notch 160 ... End part of notch 170 ... Ridge line 200 ... Part that protrudes from bag body by folding back of side face M ... Any point existing on valley fold line of side face P ... Side face Inner angle Q formed by the side edge on the side of the folded portion having the side open end seal and the mountain fold line Q ... A region where the opposing inner surfaces of the pair of flat portions can be directly fused to each other.

Claims (5)

[Claims] 1. (a) A pair of opposed flat portions that configure the front side and the back side of the bag, two side surface portions formed so as to have valley fold lines folded inward in a fold shape, and A three-side sealed bag body having a top side opening, and (b
-1) On the top side of the bag body, at least one of the side surface portions is bent and folded in the direction opposite to the original folding direction to pull out a part of the side surface portion and the mountain fold line. And a triangular side fold formed by sealing the side opening end, and (c) the bag body has a fusion sealing surface on the inner surface of the top opening end. (D-1) A gusset bag characterized in that in a region extending from at least one side surface side of the top-side opening end portion to the inside, the opposing inner surfaces of the pair of flat surface portions can be directly fused to each other. 2. (b-2) Side surface folding portions are provided on both side surfaces on the top side of the bag main body portion, and (d-2) the entire top end opening end portions are opposed to each other by a pair of flat surface portions. The gusset bag according to claim 1, wherein the inner surfaces can be directly fused to each other. 3. (a) A pair of opposing flat surface portions forming the front side and the back side of the bag, two side surface portions formed so as to have valley fold lines folded inward in a fold-like shape, and A three-side sealed bag body having a top side opening, and (b
-1) On the top side of the bag body, at least one of the side surface portions is bent and folded in the direction opposite to the original folding direction to pull out a part of the side surface portion and the mountain fold line. And a triangular side fold formed by sealing the side opening end, and (c) the bag body has a fusion sealing surface on the inner surface of the top opening end. (E) In at least one of the side face-folded portions, an inner angle formed by the side face-side edge having the side face-side open end seal portion and the mountain fold line provided in the side face-folded portion is obtained by folding the bag main body portion. 90 ° in the state
A gusset bag characterized by being less than. 4. (a) A pair of opposed flat surfaces forming the front side and the back side of the bag, two side surface portions formed so as to have valley fold lines folded inward in a fold shape, and A three-side sealed bag body having a top side opening, and (b
-1) On the top side of the bag body, at least one of the side surface portions is bent and folded in the direction opposite to the original folding direction to pull out a part of the side surface portion and the mountain fold line. And a triangular side fold formed by sealing the side opening end, and (c) the bag body has a fusion sealing surface on the inner surface of the top opening end. (F) At least one of the side folds has a peak on the opening side of the valley fold line of the side before formation of the mountain fold line, and a side face side having a mountain fold line side end of the side fold line and a seal portion. A gusset bag characterized in that it is formed so as to be a vertex sandwiched between the edge and the edge. 5. (g) A pair of opposed flat surfaces forming the front side and the back side of the bag, and two side surface portions formed so as to have valley fold lines folded inward in a fold shape. At the top of the four-sided seal bag main body and (h) bag main body, a part of the side surface is formed by bending the valley fold line of at least one side surface in a direction opposite to the original folding direction. Is a method for opening a gusset bag having a triangular side-face fold formed by forming a mountain fold line and forming a mountain fold line and sealing the side-side opening end, and (i) the gusset bag Of at least one of the side folds of the gusset bag to be projected outward from the side surface of the gusset bag, and the apex portion sandwiched between the mountain fold line side edge of the extracted side fold and the side edge having the seal portion. Can disconnect A method for opening a gusset bag, characterized by: