JPH11245959A - Plastic bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suck a liquid out even if a plastic bag is squashed, by forming projecting parts on at least one of the two layers of superimposed plastic films forming a plastic bag and on its internal face side from the position of a spout toward the other end edge of the bag. SOLUTION: A plastic bag for storing a liquid such as drink comprises plastic films 1 superimposed in two layers and has both end edges 2 and 3 and both side edges 4, the one end edge 2 being provided with a spout 5. In the case, on at least one of the layer plastic films 1, projecting parts 9 continuous on its internal surface toward the bottom edge 3 of the plastic bag are formed by modifying the plastic film 1 from the position of the spout 5 or the position of its vicinity by means of emboss processing or the like. Thus, even if the plastic bag is squashed due to negative pressure, the projecting parts 9 are connected with each other and, on their both sides, internal passages are formed, therefore, the liquid can be sucked out from the spout 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic bag having a spout.

[0002]

2. Description of the Related Art In general, plastic bags having spouts are used for storing liquids such as beverages. FIG. 18 shows a conventional plastic bag. This plastic bag is made of a plastic film 1 superposed in two layers, has a rectangular shape and a fixed size, and has both side edges 2 and 3 and both side edges 4. further,
A spout 5 is provided at one end edge 2. One edge 2
Is the top edge of the plastic bag. Therefore, the other edge 3 is the bottom edge of the plastic bag. The spout 5 is for sucking out liquid from a plastic bag, is made of plastic, and is inserted between the plastic films 1. Furthermore, each plastic film 1 has a spout 5
The plastic film 1 and the spout 5 are fixed to each other by heat sealing or ultrasonic sealing, and the plastic films 1 are heat sealed or ultrasonically sealed to each other, and the top edge 2, the bottom edge 3 and the side edges 4 have sealing portions 6 Are formed.

In the case of the plastic bag shown in FIG. 18, when the liquid in the plastic bag is sucked out of the spout 5, a negative pressure is generated in the plastic bag. For this reason, when a considerable amount of liquid is sucked out, particularly in a plastic bag of a considerable length, the plastic bag is distorted by the negative pressure, each plastic film 1 comes into contact, is closed, and the portion and the top are closed. There is a problem that the liquid between the rim 2 can be sucked out, but the liquid between the crooked portion and the bottom edge 3 cannot be sucked out.

[0004] Based on this, as shown in FIG. 19, a spout 5 may be provided with a conduit 7. The conduit 7 is of a length corresponding to the plastic bag, has a number of liquid flow holes 8, is inserted into the plastic bag, and reaches near the bottom edge 3 thereof. In this case, even if the plastic bag is distorted by the negative pressure, the liquid between the portion and the bottom edge 3 passes through the conduit 7 and is guided to the spout 5, which can be sucked out of the spout 5.

However, the spout 5 shown in FIG. 19 requires the special provision of the conduit 7, and there is a problem that the material cost of the spout 5 is high. In the plastic bag manufacturing process, when the spout 5 is inserted between the plastic films 1 and both are heat-sealed or ultrasonic-sealed with each other, the conduit 7 must be inserted into the plastic bag, which is achieved. This is not easy, and there is a problem that a device having a complicated configuration and high cost is required.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to enable a liquid to be sucked out without trouble even if a plastic bag is torn down due to negative pressure, and to eliminate the need to provide a conduit for a spout. It was done as.

[0007]

The invention according to this application is three inventions. According to the first invention, in a plastic bag made of a plastic film laminated on two layers and having a spout provided at one end edge, the plastic film is provided on at least one layer of the plastic film from a position of the spout or a position near the spout. A continuous or discontinuous protruding portion toward the inner surface side is formed toward the other end edge of. Therefore, a negative pressure is generated in the plastic bag, and when the plastic bag is smashed by the negative pressure, the protruding portion forms an internal flow path extending between the other end edge and the spout.

According to the second aspect of the present invention, the plastic film of at least one layer is formed so as to be bent outward or inward from the spout position or a position near the spout toward the other end of the plastic bag. When a negative pressure is generated in the bag and the plastic bag is torn down due to the negative pressure, the folding forms an internal flow path extending between the other end edge and the spout.

According to the third aspect of the present invention, at least one layer of the plastic film is formed with a curved portion from the position of the spout or a position near the spout toward the outer surface toward the other end of the plastic bag. When a negative pressure is generated and the plastic bag is distorted by the negative pressure,
The curved portion forms an internal flow path extending between the other end edge and the spout.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below.
FIG. 1 shows an embodiment of the present invention. This is a plastic bag for storing a liquid such as a beverage, which is made of a plastic film 1 laminated in two layers, has a rectangular shape, and has both ends 2, 3 and both sides 4, The spout 5 is provided at one end edge 2 as in the plastic bag of FIG. One edge 2 is the top edge of the plastic bag and the other edge 3 is the bottom edge of the plastic bag. As shown in FIG. 2, the spout 5 is inserted between the plastic films 1, and the respective plastic films 1 are heat-sealed or ultrasonically sealed to the spout 5, whereby the plastic film 1 and the spout 5 may be fixed. This is similar to the plastic bag of FIG.
Each of the plastic films 1 is heat-sealed or ultrasonic-sealed with each other, and the sealing portion 6 is formed on the top edge 2, bottom edge 3 and both side edges 4 in the same manner as in the plastic bag of FIG.

Further, a continuous protruding portion 9 is formed on at least one layer of the plastic film 1 from the position of the spout 5 or a position near the spout 5 to the inner surface side toward the bottom edge 3 of the plastic bag. In the embodiment of FIG. 1, as shown in FIG. 3, both layers of the plastic film 1 have continuous protrusions 9 formed on the inner surface side, and the protrusions 9 face each other. The protruding portion 9 of FIGS. 1 and 3 can be formed by deforming the plastic film 1 by embossing, other hot pressing, ultrasonic pressing, pressure forming or vacuum forming. The deformation a is 0.03 to 6 mm
It is preferred that

In the case of the plastic bag of FIG.
Is a straight line, is formed at a fixed distance D from the lower end of the spout 5, and extends toward the bottom edge 3 of the plastic bag 3. The position is the center position in the width direction of the plastic bag, and the distance D is smaller than 1.5 times the thickness T of the spout 5 where the plastic film 1 is heat-sealed or ultrasonically sealed to the spout 5.

Therefore, even if a negative pressure is generated in the plastic bag and the plastic bag is torn down by the negative pressure, the protruding portions 9 of the respective plastic films 1 are engaged with each other, and the protruding portions 9 cause the inner portions on both sides thereof. Channel 1
0 is formed. The internal flow path 10 extends between the bottom edge 3 of the plastic bag and the spout 5. Therefore, the liquid between the crooked portion and the bottom edge 3 passes through the internal flow path 10 and is guided to the spout 5, which can be sucked out of the spout 5.

In the case of forming the continuous protruding portions 9 on the inner surface side of the plastic films 1 of both layers, as shown in FIG. May be formed in parallel at intervals and may be opposed to each other. As shown in FIG. 6, in each plastic film 1, a plurality of pairs of projecting portions 9 may be formed radially toward the bottom edge 3 of the plastic bag and may be opposed to each other. When formed radially, as shown in FIG. 7, each pair of projecting portions 9 may be curved so as to bulge toward both side edges 4 of the plastic bag. In this case, when the plastic bag is laid down by the negative pressure, as shown in FIG. 5, in each plastic film 1, each pair of projecting portions 9 engage with each other, thereby forming a large internal flow path 10; preferable.

As in the embodiment of FIG. 1, the plastic film 1 is also formed on the protruding portion 9 of FIGS. 4, 6 and 7 by embossing, other hot pressing, ultrasonic pressing, pressure forming or vacuum forming. The protrusion 9 can be formed by deformation. The deformation a is 0.0
It is preferably 3 to 6 mm. Further, each pair of projecting portions 9 is formed at a fixed distance D from the lower end of the spout 5, and the projecting portions 9 extend toward the bottom edge 3 of the plastic bag. It is smaller than 1.5 times the thickness T of the spout 5 at the portion where heat sealing or ultrasonic sealing is performed. Therefore, the liquid between the crooked portion and the bottom edge 3 is dissipated in the internal flow path 1.
It passes through 0 and is guided to the spout 5, which can be sucked out of the spout 5.

As shown in FIGS. 8 and 9, the plastic film 1 of at least one layer has a discontinuous protruding portion from the position of the spout 5 or a position near the spout 5 toward the bottom edge 3 of the plastic bag. 11 may be formed. In the embodiment of FIG. 8, discontinuous protrusions 11 are formed on the inner surface side of both layers of the plastic film 1, and in each plastic film 1, many pairs of protrusions 1 are formed.
1 is the interval C in the length and width directions of the plastic bag
1 and C2 are formed in parallel and face each other. The interval C1 in the length direction is preferably 1 to 10 mm, and the interval C2 in the width direction is preferably 1 to 20 mm. FIG.
In the embodiment of the present invention, both layers of the plastic film 1 are formed with discontinuous protrusions 11 on the inner surface side, and in each plastic film 1, a large number of pairs of protrusions 11 are formed in the length and width directions of the plastic bag. They are formed in a zigzag pattern at intervals and face each other. The interval C0 between the protruding portions 11 is preferably 1 to 10 mm. In this case, when the plastic bag is laid down by the negative pressure, in each of the plastic films 1, the projecting portions 11 of each pair engage with each other, so that a large internal flow path can be formed.

8 and 9, the plastic film 1 can be deformed by embossing, other heat press working, ultrasonic press working, pressure forming or vacuum forming to form the projecting part 11. Preferably, the deformation a is 0.03 to 6 mm. Further, the protruding portion 11 is formed at a fixed distance D from the lower end of the spout 5 and extends toward the bottom edge 3 of the plastic bag, and the distance D is determined by heat-sealing or ultrasonic-sealing the plastic film 1 to the spout 5. It is smaller than 1.5 times the thickness T of the spout 5 in the part where it is located. Therefore, the liquid between the crooked portion and the bottom edge 3 passes through the internal flow path, is guided to the spout 5, and can be sucked out of the spout 5.

As shown in FIG. 10, instead of the continuous or discontinuous projecting portions 9 and 11, the plastic film 1 of at least one layer is provided on the bottom edge 3 of the plastic bag from the position of the spout 5 or a position near the spout 5. The fold 12 may be formed toward the outer surface side or the inner surface side. In this embodiment, as shown in FIG. 11, both sides of the plastic film 1 are formed with folds 12 on the outer surface side, and the folds 12 face each other. Therefore,
When the plastic bag is laid down by the negative pressure, the internal channel 13 is formed by the fold 12. Conversely,
As shown in FIG. 12, a fold 12 is formed on the plastic film 1 of both layers toward the inner surface side.
2 may be opposed to each other. In this case, when the plastic bag is laid down by the negative pressure, internal flow paths 13 are formed on both sides of the fold 12.

The folded portion 12 of the plastic film 1 can be formed by sandwiching the folded plastic film 1 between a pair of heating members, and heating and pressing the plastic film 1 by the heating member. The fold 12 is formed at a fixed distance D from the lower end of the spout 5 and extends toward the bottom edge 3 of the plastic bag, and the distance D is the part of the plastic film 1 where the plastic film 1 is heat-sealed or ultrasonic-sealed to the spout 5. It is smaller than 1.5 times the thickness T of the spout 5. Therefore, the liquid between the crooked portion and the bottom edge 3 is dissipated in the internal flow path 1.
3, it is led to the spout 5, which can be sucked out of the spout 5.

As shown in FIG. 13, a curved portion 14 is formed on at least one layer of the plastic film 1 from the position of the spout 5 or a position near the spout 5 toward the bottom edge 3 of the plastic bag. Good. In this embodiment, as shown in FIG. 14, the plastic films 1 of both layers are formed with curved portions 14 on the outer surface side, and the curved portions 14 face each other. Therefore, when the plastic bag is torn down by the negative pressure, the curved portion 1
4 forms an internal flow path 15.

Further, as shown in FIG. 15, in each plastic film 1, a plurality of pairs of folded portions 12 or curved portions 14 may be formed in parallel at intervals in the width direction of the plastic bag, and may be opposed to each other. . As shown in FIG. 16, in each plastic film 1, a plurality of pairs of folded portions 12 or curved portions 14 may be formed radially toward the bottom edge 3 of the plastic bag and may be opposed to each other. As shown in FIG. 17, each pair of folds 12 or curved portions 14 may be curved to bulge toward the side edges 4 of the plastic bag. In this case, each pair of folded portions 12 or curved portions 14 can form an internal flow path, which is preferable.

It is not always necessary to form the continuous or discontinuous protruding portions 9 and 11 on the inner surface side in the plastic film 1 of both layers. A continuous or discontinuous protruding portion 9, 11 is formed on the inner side of the plastic film 1 of one layer, and when the plastic bag is shrunk by negative pressure, the protruding portion 9, 11 is formed on the plastic film of the other layer. 1 and projecting portions 9,
Internal flow paths may be formed on both sides of the eleventh embodiment.
It is not always necessary to form the folds 12 on the outer side or the inner side on the plastic film 1 of both layers. One side of the plastic film 1 may be formed with a fold 12 on the outer surface side or the inner surface side, and the fold 12 may form an internal flow path. The curved portion 14 on the outer side does not necessarily have to be formed on both layers of the plastic film 1. A curved portion 14 toward the outer surface side may be formed in the plastic film 1 of one layer, and the curved portion 14 may form an internal flow path.

[0023]

As described above, according to the present invention, when a plastic bag is torn down by negative pressure,
The internal flow paths 10, 13, 15 are formed by the protruding portions 9, 11, the folded portion 12, or the curved portion 14. Therefore, the liquid between the crooked portion and the bottom edge 3 is dissipated in the internal flow path 1.
The spout 5 is guided to the spout 5 through 0, 13, and 15 and can be sucked out without any trouble. Thus, it is not necessary to provide the spout 5 with the conduit 7 as in the conventional case, and the intended purpose can be achieved. Things.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of the spout and the plastic film of FIG.

FIG. 3 is an enlarged sectional view of a protruding portion of the plastic film of FIG.

FIG. 4 is a side view showing another embodiment.

5 is an enlarged sectional view of a protruding portion of the plastic film of FIG.

FIG. 6 is a side view showing another embodiment.

FIG. 7 is a side view showing another embodiment.

FIG. 8 is a side view showing another embodiment.

FIG. 9 is a side view showing another embodiment.

FIG. 10 is a side view showing another embodiment.

FIG. 11 is an enlarged sectional view of the folded plastic film of FIG. 10;

FIG. 12 is an enlarged sectional view showing another embodiment.

FIG. 13 is a side view showing another embodiment.

FIG. 14 is an enlarged sectional view of a curved portion of the plastic film of FIG.

FIG. 15 is a side view showing another embodiment.

FIG. 16 is a side view showing another embodiment.

FIG. 17 is a side view showing another embodiment.

FIG. 18 is a side view of a conventional plastic bag.

FIG. 19 is a side view of another plastic bag.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plastic film 2 One edge 3 Other edge 5 Spout 9 Continuous protruding part 10 Internal flow path 11 Discontinuous protruding part 12 Folding 13 Internal flow path 14 Curved part 15 Internal flow path

Claims (3)

[Claims] 1. A plastic bag comprising a plastic film laminated on two layers and having a spout provided at one end edge, wherein the plastic film is provided on at least one layer of the plastic film from the position of the spout or a position near the spout. A continuous or discontinuous protruding portion toward the inner surface side is formed toward the other end edge of the plastic bag, and a negative pressure is generated in the plastic bag. A plastic bag, wherein an internal flow path extending between an edge and the spout is formed. 2. A plastic bag comprising a plastic film superposed on two layers and having a spout provided at one end edge thereof, wherein the plastic film is provided on at least one layer of the plastic film from the position of the spout or a position near the spout. When a fold is formed on the outer surface or the inner surface toward the other end edge of the plastic bag, a negative pressure is generated in the plastic bag, and when the plastic bag is displaced by the negative pressure,
A plastic bag, wherein an internal flow path extending between the other end edge and the spout is formed by the folding. 3. A plastic bag comprising a plastic film superimposed on two layers and having a spout provided at one edge thereof, wherein the plastic bag is provided on at least one layer of the plastic film from the position of the spout or a position near the spout. A curved portion toward the outer surface side is formed toward the other end edge of the plastic bag, and a negative pressure is generated in the plastic bag. When the plastic bag is sapped by the negative pressure, the curved portion causes the other end edge and the spout to be closed. A plastic bag having an internal flow path extending therethrough.