JPH11278499A - Gusseted bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gusseted bag having an improved self-supporting property. SOLUTION: A bottom seal 39 is formed along a bottom edge 40, and oblique seals 42 are formed at each of the opposite ends of the seal 39 obliquely with respect to the edge 40. And triangular corner parts each having two sides out of the three sides 39, 42, 42 are removed. Thus a repulsion force, which is generated when the triangular corner parts are folded, can be avoided. And since both the corner parts are removed and the length of the seal 39 is made shorter, a repulsion force due to the rigidity of the seal 39 is small, and hence a bottom 38 can be sufficiently folded with respect to the front and rear surfaces 32 of the gasseted bag 30 so that the self-supporting property of the bag can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improving the self-sustainability of a gusset bag.

[0002]

2. Description of the Related Art A folded portion is provided by folding both sides of a tubular body inward, and one end on the bottom side of the tubular body is cut in a direction perpendicular to the longitudinal direction, and the bottom edge is a cut edge. A bottom seal for closing the bottom side of the tubular body along the edge is given,
In addition, gusset bags in which diagonal seals are applied to the bottom edges at both corners located at both ends of the bottom edge are widely known. For example, JP-A-61-10044
FIG. 1 of Japanese Unexamined Patent Publication No. 1 and FIG. 1 of Japanese Unexamined Utility Model Publication No. 57-35240 are such. Since such a gusset bag stores air or goods and its folded portion is opened, the bottom is formed in a substantially square shape and becomes a prismatic shape,
Since self-reliance is enhanced, it is very often used for packaging foods and the like.

[0003]

However, the conventional gusset bag 1
In FIG. 6, for example, as shown in FIG. 6, since the width is the same from the upper part 12 to the bottom part 14 of the tubular body in the folded state, the gusset bag 10 is folded by the storage of preliminarily pumped air or articles. When the bottom 16 is opened and the bottom 14 is unfolded, the bottom 14 is bent sufficiently against the back surface 18 and the front surface 20 of the gusset bag 10 as shown in the perspective view of FIG. 7 and the side view of FIG. Therefore, the stability at the time of being independent was not sufficient.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a gusset bag having good autonomy.

[0005]

The inventor of the present invention has made various studies in view of the above circumstances. As a result, it is difficult to form the bottom of the conventional gusset bag as described above with reference to FIGS. 7 and 8. As shown, the bottom edge 2 formed on the back surface 18 side
2 and a diagonal seal 24 formed in the folded portion 16 so as to be oblique with respect to the bottom edge 22 thereof. A repulsive force (particularly, the two corners 26 on the front surface 20 side) generated by bending the triangular corners 28 having the bottom edge 22 and the oblique seal 24 as two sides of the three sides when the bottom 14 is unfolded. (Repulsive force generated by bending the bottom edge 22 side along the two corners 28 on the back surface 18 side), and bending the bottom seal portion of the relatively rigid bottom edge 22 by the development of the bottom portion 14 It came to the conclusion that it was due to the repulsion generated. The present invention has been made based on such knowledge.

That is, the gist of the present invention resides in that a bottom end of a cylindrical body having a folded portion formed by folding both sides inward is cut in a direction perpendicular to the longitudinal direction and cut. A gusset bag in which a bottom seal is provided along the bottom edge and the bottom side is sealed, and diagonal seals are provided at both corners located at both ends of the bottom edge in an oblique direction with respect to the bottom edge. The gusset bag is characterized in that the portion outside the diagonal seal is cut off at both corners on the bottom side of the gusset bag.

[0007]

The gusset bag constructed as described above has a bottom seal along the bottom edge and a diagonal seal formed diagonally to the bottom edge at both ends of the gusset bag. Since both corners of the triangular shape as the sides are cut off, there is no repulsive force caused by bending the two corners of the triangular shape, and the length of the bottom seal is shortened and the rigidity of the bottom seal is reduced. Because the repulsion is low, the bottom bends sufficiently against the front and back of the gusset bag,
Independence is improved.

[0008]

Here, it is preferable that the gusset bag is provided on one surface of the bottom in a state where the gusset bag is folded, preferably on an inner edge in a width direction of the bottom seal. A polygonal line is provided along the bottom edge. With this configuration, when the bottom of the gusset bag is deployed, the bottom seal is bent along the broken line, so that the repulsive force generated by bending the bottom seal is further reduced. Independence becomes better.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view showing a state where a gusset bag 30 to which the present invention is applied is folded.

The gusset bag 30 shown in FIG. 1 has a not-shown inner surface made of a laminated film base material made of a heat-adhesive synthetic resin film such as polyethylene, polypropylene, polyvinyl chloride or the like. A substantially central portion of the back surface 32 is formed with a longitudinal seal 34 in the longitudinal direction by, for example, ultrasonic waves, high frequency waves, or thermocompression bonding, and the folded portions 36 on both sides are folded in a gusset shape. .

The bottom portion 38 is a portion that forms a bottom when the folding portion 36 is opened, and is cut in a direction perpendicular to the longitudinal direction of the tubular body, and is a cut edge of the bottom portion 38. A bottom seal 39 for closing the tubular body is provided on the rim 40.
Are applied along its bottom edge 40. The bottom portion 38 of the folded portion 36, that is, both ends of the bottom edge 40, are further attached to the bottom edge 40 in a state where the gusset bag 30 is folded.
Each of the diagonal seals 42 is provided at an angle of 5 °, and the bottom edge 4 outside the diagonal seal 42 is provided.
Both corners 44 of a right-angled triangle having two sides of 0 and the oblique seal 42 are cut off to form oblique edges 46.

FIG. 2 shows the gusset bag 30 shown in FIG.
Is a perspective view showing a state where the bottom portion 38 is expanded by accommodating a flowable article such as compressed air or tea leaves therein. As shown in FIG. 2, the gusset bag 30 is formed such that the angle of the bottom portion 38 with respect to the back surface 32 and the front surface (not shown) is almost vertical as compared with the conventional gusset bag 10 shown in FIG. 7. That is, the bottom 38 is sufficiently bent with respect to the rear surface 32 and the front surface (not shown).

As described above, the gusset bag 30 constructed as in the present embodiment is provided with the bottom seal 39 along the bottom edge 40.
And the two corners 44 of which two sides are the oblique seal 42 formed obliquely with respect to the bottom edge 40 at both ends thereof are removed. Since there is no repulsive force caused by bending both corners 44 of the bottom seal 39 and the length of the bottom seal 39 is shortened by removing both corners 44, the bottom seal 3
Since the resilience due to the rigidity of the gusset 9 is small, the bottom portion 38 is sufficiently bent with respect to the front and back surfaces 32 (not shown) of the gusset bag 30, and the self-sustainability is improved.

Next, another embodiment of the present invention will be described. In the following description, the same parts as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 3 is a plan view showing a folded state of a gusset bag 50 according to another embodiment of the present invention from the front surface 51 side. The gusset bag 50 has an inner edge of the bottom seal 39 on the front surface 51 side (an inner edge in the width direction of the bottom seal 39).
Above, a bent line 52, which is a narrow linear groove parallel to the bottom edge 40, is provided by pressing a not-shown broken line forming blade at the time of punching or the like. It is different from the gusset bag 30 of the example. The broken line 52 extends from one oblique edge 46 to the other oblique edge 4 through a pair of oblique seals 42 oblique to the bottom seal 39.
6 is formed.

FIG. 4 shows the bottom 38 of the gusset bag 50 of FIG.
It is a side view which cuts out and shows. As shown in FIG. 4, the broken line 52 is provided at the upper end of the bottom seal 39.
It is a cut made with a length shorter than the thickness of.

FIG. 5 is a side view showing a state in which the bottom portion 38 of the gusset bag 50 is unfolded. The bottom line 39 is bent along the broken line 52 when the bottom 38 of the gusset bag 50 is unfolded and self-standing by the provision of the above-mentioned bent line 52, so that the bottom seal 39 is generated by being bent. Since the repulsion is further reduced, the bottom is easily formed and the self-sustainability is further improved.

Further, according to the present embodiment, the polygonal line 52 is
Since it is formed through a pair of diagonal seals 42,
The effect of the rigidity of the oblique seal 42 is also suppressed, and there is an advantage that the bottom is more easily formed.

While the embodiment of the present invention has been described with reference to the drawings, the present invention can be applied to other embodiments.

For example, in the above-described embodiment, when the bottom portion 38 is unfolded, the bottom portion 38 has a rectangular shape. Although the angle is set to be an angle, the shape when the bottom portion 38 is expanded may be a square, and the angle of the oblique seal 42 may be any angle other than the above.

In the gusset bag 50 shown in FIG.
Although the broken line 52 is provided on the front surface 51 side of the bottom seal 39, the broken line 52 may be provided on the back surface 32 side of the bottom seal 39. Further, although the fold line 52 is formed along the inner edge of the bottom seal 39, the broken line 52 may be located at a position shifted from the inner edge by a predetermined distance toward the opening side of the gusset bag 50.

The above is merely an example of the present invention, and the present invention can be variously modified without departing from the gist thereof.

[Brief description of the drawings]

FIG. 1 is a plan view showing a state in which a gusset bag according to an embodiment of the present invention is folded.

FIG. 2 is a perspective view showing a state where the bottom of the gusset bag of FIG. 1 is expanded.

FIG. 3 is a plan view showing a state where a gusset bag according to another embodiment of the present invention is folded.

FIG. 4 is a side view in which a part of the gusset bag of FIG. 3 is cut away.

5 is a side view showing a state where the bottom of the gusset bag of FIG. 3 is expanded.

FIG. 6 is a plan view showing a state where a conventional gusset bag is folded.

FIG. 7 is a perspective view showing a state where the bottom of the gusset bag of FIG. 6 is expanded.

8 is a side view showing a state where the bottom of the gusset bag of FIG. 6 is expanded.

[Explanation of symbols]

 30, 50: gusset bag 36: folded part 38: bottom part 40: bottom edge 42: diagonal part 52: broken line

Claims (1)

[Claims] 1. A bottom end of a cylindrical body having a folded portion formed by folding both sides inward is cut in a direction perpendicular to a longitudinal direction, and a bottom seal is formed along the cut bottom edge. A gusset bag in which the bottom side is sealed and both corners located at both ends of the bottom edge are provided with diagonal seals in a diagonal direction with respect to the bottom edge. A gusset bag, wherein a portion outside the diagonal seal is cut off at both corners on the bottom side.