JP7124394B2 - Easy-open packaging bag - Google Patents

Description

TECHNICAL FIELD The present invention relates to an easy-to-open pillow-shaped packaging bag, and more particularly to an easy-to-open packaging bag that can be easily opened even by handicapped persons.

Conventionally, packaging bags for packaging articles such as foodstuffs such as candies and sweets block the outside air to prevent the contents from deteriorating, and prevent the oxidation of the contents by blocking the light. They often have functions. In many cases, it also has the function of preventing the quality from deteriorating due to moisture absorption or drying during storage of the contents.

These packaging bags are generally sealed by heat-sealing with a heat-seal layer provided on the inner surface of the base material layer. Therefore, in order to achieve the above-mentioned purpose of the packaging bag, the heat-sealing layer must have sufficient sealing performance, and the heat-sealing layer must be sufficiently heat-sealed so that the sealed portion does not peel off during transportation or other processes. It is necessary to have strength.

However, the excessive heat-sealing strength for protecting the contents makes it difficult for consumers to open the package easily by hand, often requiring the use of tools such as scissors. In addition, a large force is required to open the package, and even if the package can be opened, the contents may pop out due to excessive force at the moment of opening, or the opening interface may be destroyed, which is not aesthetically pleasing. There has been a demand for a packaging bag that maintains sufficient sealing performance to protect the contents from such problems and that can be easily opened by hand.

On the other hand, as a technique for partially narrowing the seal width, a technique such as that disclosed in Cited Document 1 is known. This is a food packaging bag for a microwave oven, which is manufactured using a soft packaging material film and has at least a back seal portion, in which a partial region of the back seal portion is formed with a narrow seal width. A food packaging bag for a microwave oven is provided with an opening seal portion that can be peeled and opened by internal pressure of the bag.

As shown in FIG. 10, this cited reference 1 discloses a multi-layered flat bag-shaped sealed packaging bag using a film 121 such as a polyolefin film soft packaging material, and the bottom end is hermetically sealed. A hermetically sealed packaging bag comprising a lower seal portion 124 which is a bottom seal portion and side seal portions 123 and 127 which are side seal portions hermetically sealed at both left and right ends, and is filled with contents from an upper opening 122. , a part of the side seal portion formed at one side end thereof is provided with a non-seal region 126 which imparts an easy-peel function to the bag-making sealant layer. There is a disclosure of a bag provided with a completely sealed portion 125, which is a sealed portion for air-conditioning, and has a function of destroying the portion by water vapor pressure in the bag and releasing the water vapor to the outside. This bag is used by sealing the contents from the top, sealing the top sealing part, and heating with a microwave oven.

However, this packaging bag is not to be opened by hand, and the air and steam inside the bag heated by the microwave oven increase the internal pressure, thereby imparting an easy-peel function. An opening seal portion) is provided, and the air pressure or steam pressure inside the bag destroys that portion, releasing the air or steam to the outside. For this reason, the structure is such that a portion with a narrow seal width, which is provided with an easy peel function, is provided in the central portion.

However, this is inconvenient to open by hand, and even handicapped persons cannot easily open the bag.

JP-A-11-29181

In view of the problems described above, an object of the present invention is to provide an easily openable packaging bag that can be easily opened even by a handicapped person.

A first invention made to solve the above problems is a pillow packaging bag having an upper seal part and a lower seal part, and a non-sealed area or a weakly sealed area along the side edge of the upper seal part The unsealing assisting area is provided from the bottom to the middle of the upper seal part, and has a completely sealed part that is not the unsealing assisting area at the top thereof, and the unsealing assisting area is the wide part in the central part. The easy-open packaging bag is characterized by comprising a lower narrow portion, the wide portion gradually widening from the narrow portion toward the upper portion, and gradually narrowing toward the completely sealed portion .

A second aspect of the present invention is the easy-open packaging bag according to claim 1, wherein the opening assisting region consists only of the non-sealing region.

A third aspect of the present invention is the easy-open packaging bag according to any one of claims 1 and 2, wherein the opening assisting region consists only of the weak sealing region.

A fourth aspect of the present invention is the easy-open packaging bag according to claim 1 , wherein the back sealing portion is also provided as the sealing portion.

A fifth aspect of the present invention is the easy-open packaging bag according to claim 1 , which comprises a substrate layer and a sealant layer, wherein the sealant layers are joined together to form a sealed portion.

A sixth aspect of the present invention is the easy-to-open package according to claim 5, wherein in addition to the base material layer and the sealant layer, the easy-to-open package according to claim 5 is provided with any one of a print layer, a barrier layer, a light shielding layer, a protective layer, an oxygen absorbing layer, or a plurality of these layers. It is a packaging bag.

According to the present invention, it is possible to provide an easily openable packaging bag that can be easily opened even by a handicapped person.

1 is a front view of an embodiment of an easy-open packaging bag of the present invention; FIG. FIG. 2 is a rear view of one embodiment of the easy-open packaging bag of FIG. 1 of the present invention; FIG. 2 is a partially enlarged front view of one embodiment of the easy-open packaging bag of FIG. 1 of the present invention; 1 is a partial cross-sectional view of one embodiment of a film used in an easy-open packaging bag of the present invention; FIG. 1. It is a front view of one Example of the easy-open packaging bag different from FIG. 1 of this invention. FIG. 6 is a rear view of one embodiment of the easy-open packaging bag of FIG. 5 of the present invention; FIG. 6 is a partially enlarged front view of one embodiment of the easy-open packaging bag of FIG. 5 of the present invention; 1 is a front view of an example of an easy-open packaging bag of a comparative example; FIG. FIG. 2 is a rear view of one embodiment of the easy-open packaging bag of FIG. 1 as a comparative example; 1 is a front view of an example of a conventional easy-open packaging bag; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view of one embodiment of the easy-open packaging bag of the present invention, and FIG. 2 is a rear view of the same. The easy-open packaging bag of the present invention is made by folding a rectangular soft packaging material film having a sealant layer on the inner surface of a base material layer into three along parallel creases, and folding the bag at an appropriate position such as the center or near the ends of the center. Then, the same inner surfaces of both ends of the soft packaging material film folded in three are overlapped with each other in a palm-to-palm manner, and the overlapped inner surfaces are adhesively sealed by hot pressure to form a back seal portion 25. . In addition, the sealant layer is a heat-fusible resin layer capable of bonding and sealing the inner surfaces with heat pressure.

At the lower end of the three-fold flexible packaging material film, the lower seal portions 13, 23 are formed which are adhered and sealed by heat and pressure in a direction perpendicular to the back seal portion 25, and the contents are placed at the upper end. It has an unsealed upper opening for filling, and after the contents are filled or sealed from the upper opening, the upper seal portions 12 and 22 are formed by adhesive sealing by heat pressure.

The lower end portion of the back seal portion 25 that intersects the lower seal portions 13 and 23 and/or the upper end portion that intersects the upper seal portions 12 and 22 are connected to the lower seal portions 13 and 23 and the top seal portions 12 and 22, respectively. The bags may be superimposed on top of each other and adhesively sealed together to form a bag, or they may be formed separately from each other. Such a separated state occurs when the outermost film of the flexible packaging material film used for bag making has a higher melting point than the innermost sealant layer and is fused by thermal fusion sealing.

Instead of this, the upper end of the tri-fold flexible packaging film is formed with upper seal portions 12, 22 which are adhered and sealed by heat pressure in a direction orthogonal to the back seal portion 25, and the lower end is formed with is provided with an unsealed lower opening for filling the contents, and after filling or enclosing the contents from the lower opening, the lower seal parts 13 and 23 are formed by bonding and sealing by heat pressure. good.

Non-sealing areas 14 , 24 are provided at one side end 15 of the upper sealing portions 12 , 22 . One side end portion 15 of the upper seal portions 12, 22 and the non-seal areas 14, 24 will be described in detail below with reference to the partially enlarged front view of FIG.

The non-sealed areas 14 and 24 are provided at the side ends 36 halfway from the lower end of the upper sealed section 32, and the completely sealed section 35, which is not the unsealing assisting area, is provided above them.

The non-sealed areas 14 and 24 are formed by a central wide portion 34 and a lower narrow portion 33 of the upper seal portion 32 . The wide portion 34 is gradually narrowed toward the completely sealed portion 35 . Further, the wide portion 34 gradually widens from the narrow portion 33 upward.

At this time, the upper seal width 41 of the upper seal portion 32 is narrowed only at the side end portion 36 due to the non-sealed region, and is sealed only at the complete seal portion 35 . Therefore, when the internal pressure of the air or contents in the non-sealed area reaches a predetermined pressure or higher, the adhesively sealed inner surfaces separate from each other, and the completely sealed portion 35 is unsealed to open. can.

At this time, by adjusting the complete seal length 40, it is possible to set the ease with which the upper seal portion 32 is peeled open.

The film for making the easy-open packaging bag is a composite film that is a laminated film of two to three layers or more in which a sealant layer is formed at least on the innermost surface side of the base layer, that is, on the adhesive seal side. .

For example, as shown in FIG. 4, biaxially oriented polypropylene 51, ink 52, anchor coat layer 53, extrusion polyethylene 54, polyethylene terephthalate 55, aluminum deposition layer 56, anchor coat layer 57, extrusion polyethylene 58, non-stretched polypropylene. A film 59 is laminated, or the like is used.

As described above, as the synthetic resin for the sealant layer on the innermost side, polyolefin resins such as polyethylene and polypropylene, which have a relatively low melting point and have good heat-sealing properties, are suitable. The subsequent peeling can be peeled by cohesive peeling (cohesive failure), and the peel strength is appropriately 15 N / 15 mm or more. A substrate layer that maintains predetermined properties such as gas barrier properties, moisture permeability, tear strength, flexibility, etc., or in addition to this substrate layer, any of a printed layer, a barrier layer, a light shielding layer, a protective layer, and an oxygen absorbing layer. or multiple layers of these may be provided.

Examples of lamination and layer thickness in that case include polyethylene terephthalate (12 μm)/unstretched polypropylene (50 μm) unstretched polypropylene, nylon (15 μm)/unstretched polypropylene (25 μm) unstretched polypropylene, and polyethylene terephthalate. (25 μm)/unstretched polypropylene (25 μm) unstretched polypropylene and the like.

In this case, it is preferable that an unsealing assisting region, which is a non-sealing region or a weakly sealing region, is formed along the side end surface. This is because, when unsealing, it is easy to squeeze out air or contents from the side of the contents toward the upper sealing portion with a finger into the unsealing assistance area.

Although a back seal portion is generally provided as a seal portion, it is not necessarily required when a tubular film is used.

In addition, it consists of a base material layer and a sealant layer, and it is common that the sealant layers are joined together to form a sealed portion, but adhesive bonding or the like is not excluded.

In addition to the substrate layer and the sealant layer, any one of a print layer, a barrier layer, a light shielding layer, a protective layer and an oxygen absorbing layer, or a plurality of these layers may be provided. When each layer is provided, effects such as cosmetic effects, display effects, barrier effects, light shielding effects, content protection effects, and oxygen absorption effects can be imparted.

It is preferable that the unsealing assisting region is provided from the bottom to the middle of the upper sealing portion, and there is a complete sealing portion that is not the unsealing assisting region above it. As a result, the package can be kept unopened until just before use, and the quality of the contents can be maintained.

In addition, it is preferable that the unsealing assisting region has a wide width portion in the central portion and a narrow width portion in the lower portion. By pinching the narrow width portion first, the wide portion having a larger capacity than the narrow width portion can be separated from the storage portion. It is possible to reduce the volume of the wide part while maintaining the amount of , thereby increasing the pressure in the wide part, and this increased pressure can be applied to the completely sealed part with a small amount of pinching pressure. Therefore, it is possible to easily peel off the seal between the films at the completely sealed portion with a little force, thereby making it possible to easily open the opening.

In particular, a structure in which the wide portion gradually narrows toward the completely sealed portion is preferred. With this structure, it becomes possible to concentrate the direction of peeling due to pressure in the direction toward the completely sealed portion, and it becomes possible to open little by little from the end, making it easy to adjust the opening amount or opening width. .

Further, it is preferable that the wide portion gradually widens upward from the narrow portion. With such a structure, when the volume of the wide portion is reduced while maintaining the amount of air or content by sliding fingers toward the completely sealed portion while pinching the narrow portion, the wide portion can be adjusted while adjusting the volume. The pressure can be adjusted, and the opening amount or opening width can be adjusted more easily.

Another embodiment of the present invention will be described with reference to the drawings. FIG. 5 is a front view of one embodiment of the easy-open packaging bag of the present invention, and FIG. 6 is a rear view of the same. A rectangular soft packaging material film having a sealant layer on the inner surface of a base material layer was folded into three from parallel folds, overlapped at an appropriate position such as the center or near the end of the center, and then folded into three. The same inner surfaces of both ends of the flexible packaging material film are overlapped with each other in a palm-to-palm manner, and the overlapped inner surfaces are adhesively sealed by hot pressure to form a back seal portion 75 . The sealant layer is a heat-fusible resin layer capable of bonding and sealing the inner surfaces with heat pressure.

At the lower end of the three-fold flexible packaging film, lower seal portions 63, 73 are formed which are adhesively sealed by heat pressure in a direction orthogonal to the back seal portion 75, and the contents are placed at the upper end. It has an unsealed upper opening for filling, and after filling or enclosing the contents from the upper opening, the upper seal portions 62 and 72 are formed by adhesive sealing by heat pressure.

The lower end portion of the back seal portion 75 that intersects the lower seal portions 63, 73 and/or the upper end portion that intersects the upper seal portions 62, 72 are connected to the lower seal portions 63, 73 and the top seal portions 62, 72, respectively. The bags may be superimposed on top of each other and adhesively sealed together to form a bag, or they may be formed separately from each other. Such a separated state occurs when the outermost film of the flexible packaging material film used for bag making has a higher melting point than the innermost sealant layer and is fused by thermal fusion sealing.

Instead of this, the upper end of the tri-fold flexible packaging film is formed with upper seal portions 62, 72 which are adhered and sealed by heat pressure in the direction orthogonal to the back seal portion 75, and the lower end is formed with is provided with an unsealed lower opening for filling the contents, and after filling or enclosing the contents from the lower opening, the lower seal parts 63, 73 are formed by bonding and sealing by heat pressure. good.

One side end 15 of the upper seal portion 62,72 is provided with a weak seal area 64,74. One side end 65 of the upper seal portions 62, 72 and weak seal areas 64, 74 will be described in detail below with reference to the partially enlarged front view of FIG.

Weakly sealed areas 64, 74 are provided at the side ends 76 halfway from the lower end of the upper sealed part 72, and a fully sealed part 85, which is not an unsealing assisting area, is provided above them.

The weak seal areas 64 and 74 are formed by a central wide portion 84 and a lower narrow portion 83 of the upper seal portion 82 . The wide portion 84 is gradually narrowed toward the completely sealed portion 85 . Further, the wide portion 84 gradually widens from the narrow portion 83 upward.

At this time, the upper seal width 91 of the upper seal portion 82 is limited only to the side ends 86, and the complete seal portion 83, which has a normal seal strength, is narrowed by the weak seal regions 64 and 74, and the seal is made only at the complete seal portion 85. not Therefore, when the internal pressure of the air or the contents of the storage portion reaches a predetermined pressure or more, the inner surfaces adhered and sealed by the weak seal regions 64 and 74 are first peeled off from each other, and then the completely sealed portion 85 is released. The seal is broken and can be opened.

At this time, by adjusting the complete seal length 90, it is possible to set the ease with which the upper seal portion 82 is peeled open.

(Example)
A biaxially oriented polypropylene film having a thickness of 20 μm was printed with a desired ink, and then anchor-coated. A polyethylene terephthalate film having a thickness of 12 μm was vapor-deposited with aluminum, and further anchor-coated at 0.26 g/m ² (dry coating amount) using a urethane adhesive (A3210). In this case, a similar film thickness was obtained even when polybutadiene (EL451) was used instead of the urethane adhesive and 0.02 g/m ² (dry coating amount) anchor coating was performed.

A non-stretched polypropylene film having a thickness of 18 μm was prepared for this, and polyethylene heated to a state just before melting was sandwiched between each film and laminated using an extrusion laminator.

As a result, biaxially oriented polypropylene (20 μm)/ink/anchor coat layer (0.5 μm)/extrusion polyethylene (10 μm)/aluminum-deposited polyethylene terephthalate (12 μm)/anchor coat layer (0.5 μm)/extrusion polyethylene ( 10 μm)/unstretched polypropylene film (12 μm) was prepared.

After preparing the film, the 20 mm wide back seal portion and the 20 mm wide bottom seal portion were sealed using a conventional bag making machine under the conditions of 160° C., 0.2 MPa, and 1 second. As a result, a seal strength of 15 N/15 mm or more was obtained.

Furthermore, after the contents were sealed, a seal bar with a non-sealed area (width of narrow part 10 mm, maximum width of wide part 20 mm) was prepared at the end, and subjected to heat treatment at 160 ° C., 0.2 MPa, 1 second. The 25 mm wide upper seal portion was sealed under the conditions. As a result, a seal strength of 15 N/15 mm or more was obtained.

As a result, an easily openable packaging bag as shown in FIGS. 1 and 2 was obtained. That is, the film is folded in three along parallel creases to form the back seal portion 25 and the lower seal portions 13, 23, and the upper seal portions 12, 22 are formed after the contents are filled from the upper opening. , and non-sealing areas 14 and 24 are provided at one side end 15 thereof.

(Comparative example)
Same as Example, biaxially oriented polypropylene (20 μm)/ink/anchor coat layer (0.5 μm)/extrusion polyethylene (10 μm)/aluminized polyethylene terephthalate (12 μm)/anchor coat layer (0.5 μm)/extrusion A film composed of polyethylene (10 μm)/unstretched polypropylene film (12 μm) was prepared.

After that, the back seal part and the lower seal part were sealed using a conventional bag making machine under the conditions of 160 ° C., 0.2 MPa, 1 second, and after enclosing the contents, the same was done with this bag making machine. The upper sealing portion was sealed under conditions of 160° C., 0.2 MPa, and 1 second. As a result, a seal strength of 15 N/15 mm or more was obtained for all of the back seal portion, upper seal portion, and lower seal portion.

As a result, easy-open packaging bags as shown in FIGS. 8 and 9 were obtained. That is, the film is folded in three along parallel creases to form a back seal portion 114 and lower seal portions 103, 113, and after the contents are filled from the upper opening, the upper seal portions 102, 112 are formed over the entire width. be.

(comparison)
As a result of comparing the above Examples and the above Comparative Examples, it was found that the bags of the Examples could be easily opened by pressing the bag, but the bags of the Comparative Example could not be easily opened. Also, in the example, the contents could be discharged little by little at the time of opening, but in the comparative example, the contents jumped out with force as the package was opened. In addition, in the example, the opening opened slightly from the end and did not open more than intended, but in the conventional example, the amount of opening could not be adjusted by opening by hand, and it opened wide.

11, 21, 31, 61, 71, 81, 101, 111 ... storage portion 12, 22, 32, 62, 72, 82, 102, 112 ... upper seal portion 13, 23, 63, 73, 103 , 113, 124 Lower seal portions 14, 24, 126 Non-seal regions 15, 36, 65, 86 Side ends 25, 75, 114 Back seal portions 33, 83 Narrow width portions 34, 84 Wide width portions 35, 85, 125 Completely sealed portions 37, 87 Narrow width portions 38, 88 Narrow length portions 39, 89 Wide width portions Maximum width 40, 90 Complete seal length 41, 91 Upper seal width 42, 92 Breaking line 51 Biaxially oriented polypropylene 52 Ink 53 Anchor coat layer 54 Extrusion polyethylene 55 Polyethylene terephthalate 56 Aluminum deposition layer 57 Anchor coat layer 58 Extrusion polyethylene 59 Unstretched polypropylene film 64, 74 Weak seal region 121 ... film 122 ... opening 123, 127 ... side sealing part

Claims (6)

A pillow packaging bag having an upper seal portion and a lower seal portion,
An unsealing assisting region is provided by a non-sealing region or a weakly sealing region along the side edge of the upper sealing portion ,
The unsealing assisting area is provided from the lower part to the middle of the upper seal part, and has a completely sealed part that is not the unsealing assisting area at the upper part thereof,
The unsealing assistance area is composed of a central wide part and a lower narrow part, and the wide part gradually widens from the narrow part toward the upper part and gradually narrows toward the completely sealed part. An easy-open packaging bag. 2. The easy-to-open packaging bag according to claim 1, wherein the opening assisting area consists only of the non-sealing area. 2. The easy-open packaging bag according to claim 1, wherein the opening assistance area consists only of the weak seal area. 2. The easy-open packaging bag according to claim 1 , further comprising a back seal portion as the seal portion. 2. The easy-open packaging bag according to claim 1 , comprising a base material layer and a sealant layer, wherein the sealant layers are joined together to form a seal portion. 6. The easy-open packaging bag according to claim 5 , further comprising a substrate layer, a sealant layer, a print layer, a barrier layer, a light-shielding layer, a protective layer, an oxygen-absorbing layer, or a plurality of these layers.

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