JP6911358B2 - Packaging bag and how to use it - Google Patents

Description

The present invention relates to a packaging bag having a gusset portion and a method of using the same.

The conventional packaging bag is disclosed in Patent Document 1. This packaging bag is formed into a gusset type by a laminate having at least a base material layer and a heat-bonding layer. The back side of the packaging bag is heat-bonded by the back seal portion where the laminated body is stuck together. Both ends orthogonal to the back seal portion are heat-bonded by a pair of end seal portions. Further, an opening start portion formed of a notch is provided on the back seal portion. On both sides of the back seal portion, linear opening cuts parallel to the back seal portion are formed by a cutting edge or the like.

When the back seal portion is gripped on both sides of the opening start portion and pulled in opposite directions, the laminate is torn in the direction intersecting the back seal portion starting from the opening start portion. When the tear cut line reaches the opening cut, the laminate is torn along the opening cut parallel to the back seal. As a result, an opening opening extending in the longitudinal direction of the back seal portion is formed, and the packaging bag can be easily opened and the contents can be taken out.

Japanese Unexamined Patent Publication No. 2008-254800 (pages 4 to 7, FIG. 4)

However, according to the conventional packaging bag, the strength of the packaging bag is lowered because the opening cut is provided. Therefore, if an impact force or pressing force is applied on the opening cut during transportation of the packaging bag, the packaging bag may be opened from the opening cut. Therefore, there is a problem that the packaging bag is not convenient.

An object of the present invention is to provide a packaging bag capable of improving convenience and a method of using the same.

In order to achieve the above object, the present invention is formed of a laminate having fragility in one direction, and has a front surface portion, a back surface portion facing the front surface portion, an upper end portion of the front surface portion, and an upper end portion of the back surface portion. In a packaging bag provided with a gusset portion for connecting the above, the first end seal portion in which the front surface portion and the back surface portion are bonded at both end ends, and the front surface portion and the front portion are continuous with the first end seal portion. It has a second end seal portion in which the gusset portion is bonded at both end ends, and a third end seal portion in which the back surface portion and the gusset portion are bonded at both side ends in succession to the first end seal portion. It is characterized in that the direction of the laminating body is orthogonal to the first end sealing portion.

According to this configuration, the packaging bag is torn and opened in the direction orthogonal to the first end seal portion, the second end seal portion, or the third end seal portion. When the packaging bag is torn from above the second end seal portion or the third end seal portion, the packaging bag can be closed by folding back at the lower end of the second end seal portion or the third end seal portion.

Further, the present invention is characterized in that, in the packaging bag having the above structure, the laminate contains a uniaxially stretched film.

Further, the present invention is characterized in that, in the packaging bag having the above structure, the laminate contains a metal foil or a metal-deposited film.

Further, the present invention is characterized in that, in the packaging bag having the above configuration, an opening start portion capable of starting opening is provided at least one of the second end seal portion and the third end seal portion. According to this configuration, the laminated body is torn in a direction orthogonal to the second end sealing portion or the third end sealing portion starting from the opening start portion.

Further, the present invention is characterized in that, in the packaging bag having the above structure, a marking instructing opening is provided on the second end seal portion or the third end seal portion provided with the opening start portion.

Further, the present invention is characterized in that, in the packaging bag having the above structure, the opening start portion is extended on the first end seal portion. According to this configuration, the contents can be easily taken out by tearing the packaging bag from the opening start portion on the first end seal portion according to the consumption of the contents.

Further, in the method of using the packaging bag according to any one of the above configurations, the present invention tears and opens the laminated body from above the second end seal portion or the third end seal portion in a tear-prone direction. It is characterized by that.

Further, in the method of using the packaging bag having the above configuration, the present invention relates the packaging bag opened from above the second end seal portion or the third end seal portion to the front portion at the lower end of the second end seal portion. It is characterized in that it is closed by folding back or folding back the back surface portion at the lower end of the third end seal portion.

According to the present invention, since the direction of the laminating body having the fragility in one direction is orthogonal to the first end sealing portion, an opening extending in the direction orthogonal to the first end sealing portion can be easily formed. be able to. Further, since the opening cut is not formed as in the conventional example, it is possible to prevent the packaging bag from being opened even if an impact force or a pressing force is applied to the packaging bag during transportation or the like. Further, when the packaging bag is opened from above the second end seal portion or the third end seal portion, the packaging bag can be easily closed by folding back at the lower end of the second end seal portion or the third end seal portion. Therefore, the convenience of the packaging bag can be improved.

Perspective view which shows the packaging bag of 1st Embodiment of this invention. Side sectional view showing the packaging bag of the first embodiment of the present invention. Sectional drawing which shows the laminated body which forms the packaging bag of 1st Embodiment of this invention. Perspective view which shows the state at the time of opening of the packaging bag of 1st Embodiment of this invention. Side sectional view showing a state when the packaging bag of the first embodiment of the present invention is opened. Side sectional view showing a closed state after opening the packaging bag of the first embodiment of the present invention. A perspective view showing a packaging bag according to a second embodiment of the present invention. Side sectional view showing the packaging bag of the second embodiment of the present invention. A perspective view showing a packaging bag according to a third embodiment of the present invention.

<First Embodiment>
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a perspective view and a side sectional view of the packaging bag of the first embodiment. The packaging bag 1 is formed into a gusset type by a sheet-shaped laminate 30 (see FIG. 3), and contains contents such as food and medicine.

The packaging bag 1 has a front surface portion 3 and a back surface portion 4 facing each other. The upper end of the front surface portion 3 and the upper end of the back surface portion 4 are connected by the gusset portion 5. The lower end of the front surface portion 3 and the lower end of the back surface portion 4 are connected by the gusset portion 6. Usually, the width width of the front surface portion 3 and the back surface portion 4 is formed larger than the height.

Both side ends of the front surface portion 3 and both side ends of the back surface portion 4 are heat-bonded by the first end sealing portion 11. Both side ends of the gusset portion 5 and both side ends of the front surface portion 3 are heat-bonded by a second end seal portion 12 continuous with the first end seal portion 11. Both side ends of the gusset portion 5 and both side ends of the back surface portion 4 are heat-bonded by a third end seal portion 13 continuous with the first end seal portion 11.

Similarly, both side ends of the gusset portion 6 and both side ends of the front surface portion 3 are heat-bonded by the second end seal portion 12 continuous with the first end seal portion 11. Both side ends of the gusset portion 6 and both side ends of the back surface portion 4 are heat-bonded by a third end seal portion 13 continuous with the first end seal portion 11.

The front end and the rear end of the gusset portion 5 are heat-bonded to the upper end of the front surface portion 3 and the upper end of the back surface portion 4 by the hem seal portion 16, respectively. The hem seal portion 16 on the front surface portion 3 connects the left and right second end seal portions 12, and the hem seal portion 16 on the back surface portion 4 connects the left and right third end seal portions 13. Similarly, the front end and the rear end of the gusset portion 6 are heat-bonded to the lower end of the front surface portion 3 and the lower end of the back surface portion 4 by the hem seal portion 17, respectively. The hem seal portion 17 on the front surface portion 3 connects the left and right second end seal portions 12, and the hem seal portion 17 on the back surface portion 4 connects the left and right third end seal portions 13.

The outer edges of the first end seal portion 11, the second end seal portion 12, and the third end seal portion 13 are cut in a serrated shape, and a plurality of opening start portions 20 capable of starting opening are formed by the serrated valley portions. .. The opening start portion 20 may be formed by a V notch, a U notch, or an I notch. Further, the opening start portion 20 may be formed by a large number of micropores penetrating the first end seal portion 11, the second end seal portion 12, and the third end seal portion 13.

Further, markings 21 such as arrows or the like facing the opening start portion 20 are formed by printing on the second end seal portion 12 on the front surface portion 3 and the third end seal portion 13 on the back surface portion 4. .. The marking 21 may be provided on the second end seal portion 12 or the third end seal portion 13 on the gusset portion 5.

FIG. 3 shows a cross-sectional view of the laminated body 30 forming the sheet 2. The laminate 30 is formed by laminating the base material layer 31, the intermediate layer 32, and the heat-adhesive resin layer 33 in this order from the outer surface side. As the base material layer 31, polypropylene film, polyethylene terephthalate film, nylon film and the like can be used.

The intermediate layer 32 has a gas barrier property, and a metal foil (aluminum foil or the like), a metal vapor deposition film, an oxide vapor deposition film, or the like can be used. The metal-deposited film is formed by depositing a metal such as aluminum on a resin film such as a polyethylene terephthalate film. The oxide-deposited film is formed by depositing oxides such as aluminum oxide and silicon oxide on a resin film such as a polyethylene terephthalate film.

The heat-adhesive resin layer 33 has heat-adhesiveness. The heat-adhesive resin layers 33 facing each other are heat-bonded to form the first end seal portion 11, the second end seal portion 12, the third end seal portion 13, the hem seal portion 16, and the hem seal portion 17. As the heat-adhesive resin layer 33, a low-density polyethylene film, a medium-density polyethylene film, a linear low-density polyethylene film, an ethylene-α olephine copolymer polymerized using a single-site catalyst, an ethylene-vinyl acetate copolymer, and polypropylene. A film or the like can be used.

Further, the laminated body 30 has unidirectional tearability. Since at least one of the base material layer 31, the intermediate layer 32, and the heat-adhesive resin layer 33 has tearability, the laminate 30 can be imparted to tearability. As the film having fragility, a uniaxially stretched polyethylene terephthalate film, a uniaxially stretched polypropylene film, or the like having fragility in the stretching direction can be used.

The packaging bag 1 is made by transporting a sheet-like laminate 30 having tearability in the MD direction (flow direction). At this time, the hem seal portion 16 and the hem seal portion 17 are formed parallel to the MD direction. Further, the first end seal portion 11, the second end seal portion 12, and the third end seal portion 13 are formed perpendicular to the MD direction.

4 and 5 are a perspective view and a side sectional view showing a state when the packaging bag 1 is opened. The packaging bag 1 is torn in parallel with the hem seal portion 16 starting from the opening start portion 20 provided in the second end seal portion 12, for example.

As a result, the opening 22 is formed at the upper end of the packaging bag 1. At this time, since the direction of the laminate 30 is orthogonal to the first end sealing portion 11, the packaging bag 1 can be easily torn parallel to the hem sealing portion 16.

The width (length in the direction orthogonal to the first end seal portion 11) of the gusset type packaging bag 1 is usually larger than the height (length in the direction parallel to the first end seal portion 11). Therefore, the wide opening 22 can be formed and the contents can be easily taken out.

As shown in FIG. 6, the packaging bag 1 opened from the second end seal portion 12 can be easily closed by folding back the front surface portion 3 at the lower end of the second end seal portion 12. When the packaging bag 1 is bent on the first end sealing portion 11, the two laminated bodies 30 of the front surface portion 3 and the back surface portion 4 are bent. Therefore, the repulsive force of the laminated body 30 makes it easy for the packaging bag 1 to return to the state before bending, and the packaging bag 1 cannot be closed.

On the other hand, when the front surface portion 3 is folded back at the lower end of the second end sealing portion 12 (the boundary with the first end sealing portion 11), one laminated body 30 is bent and the gusset portion 5 becomes substantially flat. Be arranged. Therefore, the repulsive force of the laminated body 30 is reduced, and the repulsion is suppressed by the gusset portion 5. As a result, the packaging bag 1 is unlikely to return to the state before bending, and the packaging bag 1 can be reliably closed.

At this time, if the intermediate layer 32 is formed of a metal foil or a metal-deposited film, it is more desirable because the front surface portion 3 can be easily held in a folded state.

When the contents in the packaging bag 1 are consumed, the packaging bag 1 is resealed starting from the opening start portion 20 on the first end sealing portion 11. As a result, the opening 22 is formed at a low position, and the contents can be easily taken out by preventing the back of the user's hand from coming into contact with the inner surface of the packaging bag 1.

Similarly, when the packaging bag 1 is opened starting from the opening start portion 20 provided on the third end sealing portion 13, the packaging bag 1 is torn in parallel with the hem sealing portion 16 and opened. The opened packaging bag 1 can be closed by folding back the back surface portion 4 at the lower end of the third end seal portion 13. Further, the packaging bag 1 may be torn from the opening start portion 20 on the first end seal portion 11 to open the package.

According to the present embodiment, since the direction of the laminating body 30 having the fragility in one direction is orthogonal to the first end sealing portion 11, the opening 22 extending in the direction orthogonal to the first end sealing portion 11 Can be easily formed. Usually, the width of the packaging bag 1 (the length in the direction orthogonal to the first end seal portion 11) is larger than the height (the length in the direction parallel to the first end seal portion 11). Therefore, a wide opening 22 is formed, and the contents can be easily taken out.

Further, since the opening cut is not formed as in the conventional example, it is possible to prevent the packaging bag 1 from being opened even if an impact force or a pressing force is applied to the packaging bag 1 during transportation or the like. Further, when the packaging bag 1 is opened from above the second end sealing portion 12 or the third end sealing portion 13, the packaging bag 1 is easily folded back at the lower end of the second end sealing portion 12 or the third end sealing portion 13. Can be closed. Therefore, the convenience of the packaging bag 1 can be improved.

Similarly, when the height of the packaging bag 1 is larger than the width, the opening 22 extending in the direction orthogonal to the first end sealing portion 11 can be easily formed. Therefore, when the packaging bag 1 is opened from above the second end sealing portion 12 or the third end sealing portion 13, the packaging bag 1 is easily folded back at the lower end of the second end sealing portion 12 or the third end sealing portion 13. Can be closed to.

Further, since the laminated body 30 includes the uniaxially stretched film, it is possible to easily realize the packaging bag 1 having tearability in the direction orthogonal to the first end sealing portion 11.

Further, since the laminated body 30 includes the metal foil or the metal vapor-deposited film, it becomes easy to maintain the bent state of the laminated body 30. Therefore, the front surface portion 3 of the packaging bag 1 opened from above the second end seal portion 12 can be folded back at the lower end of the second end seal portion 12 to maintain the closed state. Further, the back surface portion 4 of the packaging bag 1 opened from above the third end seal portion 13 can be folded back at the lower end of the third end seal portion 13 to maintain the closed state.

Further, since the opening start portion 20 capable of starting the opening is provided in the second end seal portion 12 and the third end seal portion 13, the packaging bag 1 can be easily opened from above the second end seal portion 12 or the third end seal portion 13. Can be opened.

Further, since the marking 21 for instructing the opening is provided on the second end seal portion 12 and the third end seal portion 13 provided with the opening start portion 20, from above the second end seal portion 12 or the third end seal portion 13. The packaging bag 1 can be opened more easily. The opening start portion 20 and the marking 21 may be provided only on one of the second end seal portion 12 and the third end seal portion 13.

Further, since the opening start portion 20 is extended on the first end seal portion 11, the packaging bag 1 consuming the contents can be easily resealed from the first end seal portion 11.

<Second Embodiment>
Next, FIGS. 7 and 8 show a perspective view and a side sectional view of the packaging bag 1 of the second embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 6 are designated by the same reference numerals. In this embodiment, the hem seal portion 16 and the hem seal portion 17 (see FIG. 1) are omitted, and the back seal portion 14 is provided. Other parts are the same as those in the first embodiment.

The packaging bag 1 has a front surface portion 3 and a back surface portion 4 facing each other. The upper end of the front surface portion 3 and the upper end of the back surface portion 4 are connected by the gusset portion 5. The lower end of the front surface portion 3 and the lower end of the back surface portion 4 are connected by the gusset portion 6.

The laminate 30 (see FIG. 2) forming the packaging bag 1 is formed into a tubular shape by being stuck together at the back seal portion 14. The tubular laminated body 30 is bent at four points in the circumferential direction, and a front portion 3, a gusset portion 5, a back portion 4, and a gusset portion 6 are continuously provided. Then, the first end seal portion 11, the second end seal portion 12, and the third end seal portion 13 are formed by thermal adhesion at right angles to the back seal portion 14. The direction of tearability of the laminated body 30 is parallel to the back seal portion 14 and orthogonal to the first end seal portion 11.

In the present embodiment as well, as in the first embodiment, since the direction of the laminate 30 is orthogonal to the first end seal portion 11, the opening 22 extending in the direction orthogonal to the first end seal portion 11 is provided. It can be easily formed. Further, when the packaging bag 1 is opened from above the second end sealing portion 12 or the third end sealing portion 13, the packaging bag 1 is easily folded back at the lower end of the second end sealing portion 12 or the third end sealing portion 13. Can be closed.

<Third Embodiment>
Next, FIG. 9 shows a perspective view of the packaging bag 1 of the third embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 6 are designated by the same reference numerals. In this embodiment, the gusset portion 6 (see FIG. 2) on the bottom surface is omitted. Other parts are the same as those in the first embodiment.

At the lower end of the packaging bag 1, the front surface portion 3 and the back surface portion 4 are continuously provided by bending the laminate 30. As a result, the gusset portion 6 (see FIG. 2) on the bottom surface is omitted, so that the opened packaging bag 1 is laid horizontally with the front surface portion 3 or the back surface portion 4 in contact with the installation surface.

In the present embodiment as well, as in the first embodiment, since the direction of the laminate 30 is orthogonal to the first end seal portion 11, the opening 22 extending in the direction orthogonal to the first end seal portion 11 is provided. It can be easily formed. Further, when the packaging bag 1 is opened from above the second end sealing portion 12 or the third end sealing portion 13, the packaging bag 1 is easily folded back at the lower end of the second end sealing portion 12 or the third end sealing portion 13. Can be closed.

In the present embodiment, the lower end of the front surface portion 3 and the lower end portion of the back surface portion 4 may be thermally bonded. Further, as in the second embodiment, the hem seal portion 16 may be omitted and the back seal portion 14 (see FIG. 8) may be provided.

An example formed for evaluating the packaging bag 1 will be described below.

Example 1 is formed by the packaging bag 1 of the first embodiment. The width of the packaging bag 1 is 15 cm, the height is 13 cm, and the depth of the gusset portion 5 is 2.5 cm. The base material layer 31 of the laminate 30 is made of a uniaxially stretched polyethylene terephthalate film (manufactured by Unitika Ltd., Embret (registered trademark)) having a thickness of 12 μm. The intermediate layer 32 is made of an aluminum-deposited polyethylene terephthalate film (manufactured by Toray Industries, Inc., VM-PET 1310) having a thickness of 12 μm. The heat-adhesive resin layer 33 is made of a linear short-chain branched polyethylene film (manufactured by Futamura Chemical Co., Ltd., XMTN) having a thickness of 30 μm.

Example 2 is formed by a packaging bag 1 having the same outer shape as that of Example 1. The base material layer 31 of the laminate 30 is made of a biaxially stretched polyethylene terephthalate film (manufactured by Toyobo Co., Ltd., E5100) having a thickness of 12 μm. The intermediate layer 32 is made of an aluminum foil (JIS 1N30) having a thickness of 7 μm. The heat-adhesive resin layer 33 is made of a uniaxially stretched polypropylene film (manufactured by Dai Nippon Printing Co., Ltd., IL-CUT (registered trademark)) having a thickness of 30 μm.

Example 3 is formed of a packaging bag 1 having the same outer shape as that of Example 1. The base material layer 31 and the heat-adhesive resin layer 33 of the laminate 30 are the same as those in the first embodiment. The intermediate layer 32 is made of a 12 μm-thick aluminum oxide-deposited polyethylene terephthalate film (manufactured by Toray Industries, Inc., Barrier Lock (registered trademark) 1011HGCR).

Example 4 is formed by a packaging bag 1 having the same outer shape as that of Example 1. The base material layer 31 and the heat-adhesive resin layer 33 of the laminate 30 are the same as in Example 2. The intermediate layer 32 is made of a 12 μm-thick aluminum oxide-deposited polyethylene terephthalate film (manufactured by Toray Industries, Inc., Barrier Rocks (registered trademark) 1011HGCR).

[Comparative Example 1]
In addition, a packaging bag 1 for comparison was prepared. Comparative Example 1 is formed of a packaging bag 1 having the same outer shape as that of the first embodiment. The intermediate layer 32 and the heat-adhesive resin layer 33 of the laminated body 30 are the same as those in the first embodiment. The base material layer 31 is made of a biaxially stretched polyethylene terephthalate film (manufactured by Toyobo Co., Ltd., E5100) having a thickness of 12 μm.

[Comparative Example 2]
Comparative Example 2 is formed by a packaging bag 1 having the same outer shape as that of the first embodiment. The base material layer 31 and the intermediate layer 32 of the laminated body 30 are the same as those in the second embodiment. The heat-adhesive resin layer 33 is made of a linear short-chain branched polyethylene film (manufactured by Futamura Chemical Co., Ltd., XMTN) having a thickness of 30 μm.

Table 1 shows the results of evaluation of openability and resealability of the packaging bags 1 of each of the above Examples and Comparative Examples.

The openability was evaluated by a sensory test by a plurality of examiners for ease of tearing the packaging bag 1 in the direction orthogonal to the second end seal portion 12. The resealability was evaluated by a sensory test by a plurality of examiners for ease of resealing by folding back the front surface portion 3 after opening the seal from above the second end seal portion 12. Each is evaluated on a four-point scale of "very good (◎)", "good (○)", "normal (△)", and "bad (x)".

According to Table 1, Examples 1 to 4 were superior in openability to Comparative Examples 1 and 2. In Comparative Example 1 and Comparative Example 2, the straightness of tearing at the time of opening was poor, and the cutting line sometimes extended below the second end sealing portion 12. Therefore, it may not be possible to reseal, and the resealability of Comparative Example 1 and Comparative Example 2 is worse than that of Examples 1 to 4. Further, in Examples 1 and 2, since the laminated body 30 has a metal layer, the closed state is maintained even if the front surface portion 3 is folded back with a weak force, and the resealability is higher than that of Examples 3 and 4. It was excellent.

According to the present invention, it can be used as a packaging bag for foods, drugs and the like.

1 Packaging bag 2 Sheet 3 Front part 4 Back part 5, 6 Gazette part 11 1st end seal part 12 2nd end seal part 13 3rd end seal part 14 Back seal part 16, 17 Hem seal part 20 Opening start part 21 Marking 22 Opening port 30 Laminated body 31 Base material layer 32 Intermediate layer 33 Thermal adhesive resin layer

Claims (8)

A front surface portion formed of a laminated body having fragility in one direction, a back surface portion having a back seal portion facing the front surface portion and having the laminated body bonded to the palm , an upper end portion of the front surface portion, and the back surface portion. In a packaging bag provided with a gusset portion that connects the upper end of the portion, and the front portion, the gusset portion, and the back portion are sequentially provided by bending the laminate, the front portion and the back portion are connected to each other. A first-end seal portion bonded at both ends in a direction orthogonal to the back seal portion, and a second-end seal portion in which the front surface portion and the gusset portion are continuously bonded to the first end seal portion at both end ends. And the first end seal portion, the back surface portion and the gusset portion are bonded to each other at both ends, and the third end seal portion is provided. A packaging bag characterized in that it is orthogonal to the seal portion. The packaging bag according to claim 1, wherein the laminate includes a uniaxially stretched film. The packaging bag according to claim 1 or 2, wherein the laminate includes a metal foil or a metal-deposited film. The packaging bag according to any one of claims 1 to 3, wherein an opening start portion capable of starting opening is provided on at least one of the second end seal portion and the third end seal portion. The packaging bag according to claim 4, wherein a marking instructing opening is provided on the second end seal portion or the third end seal portion provided with the opening start portion. The packaging bag according to claim 4 or 5, wherein the opening start portion extends over the first end seal portion. In the method of using the packaging bag according to any one of claims 1 to 6, the laminate is torn and opened in a tear-prone direction from above the second end seal portion or the third end seal portion. How to use the packaging bag. The packaging bag opened from the top of the second end seal portion or the third end seal portion is folded back at the lower end of the second end seal portion, or the front end portion is folded back at the lower end of the third end seal portion. The method of using the packaging bag according to claim 7, wherein the back portion is closed by folding back.

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