JP2023168846A - packaging bag - Google Patents

Abstract

To provide a packaging bag for refilling which is easily opened, and can secure barrier property without using a barrier film in the bottom.SOLUTION: There is provided a packaging bag (1) in which sealant surfaces of a front film (2) and a rear film (3) are made to face each other, and which has in the periphery of the sealant surfaces, a top seal part (11), a left side seal part (12), a right side seal part (13), and a bottom seal part (14) of a gusset having a bottom film (4) bent with an easy peelable sealant layer turned inside in the bottom, wherein the bottom film is made of an easily breakable film composed of at least paper (41) of a base material and sealant layers of its surface and rear face, the sealant layers facing each other while being folded of the bottom film are peelable sealants, the overlapping bottom films, the front film and the rear film are sealed with each other in the bottom, and a non-fused bottom film part is provided inside the bottom.SELECTED DRAWING: Figure 1

Description

The present invention is a packaging bag for storing liquids such as liquid drugs, toiletries such as liquid detergents and fabric softeners, and liquid foods such as concentrated coffee, which has barrier properties and can be easily stored. This invention relates to an openable packaging bag.

Traditionally, liquids such as pesticides and other liquid chemicals, liquid fertilizers, liquid detergents, fabric softeners, bleach, and other toiletry products, as well as liquid foods such as concentrated coffee, have been distributed in hard containers such as blow bottles. It had been.
However, these rigid containers for liquids use plastic and are heavy, so for environmental protection purposes, there has been a demand for thin-walled, large-capacity containers made of film for refilling purposes. However, opening containers made of film by cutting off one end and refilling the contents through the opened hole is time-consuming, and there are many problems such as spillage and residue. there were.

For example, in Patent Document 1,
The upper end opening of a cylindrical body made of a flexible sheet material is sealed, a bottom part made of a flexible sheet material is provided inside the body part near the lower end opening, and the bottom part, the body part, and the upper end are sealed. The space surrounded by the stop part is used as a dialysis agent storage cavity, and the lower end opening of the body located below the bottom is sealed and the outer surface of the bottom is covered with the lower end part of the body. A dialysis agent storage container, wherein the lower end portion of the body is removable between the sealing portion and the bottom, and the outer surface of the bottom is exposed within the lower end opening of the body in the cut state. ,
Until the cutting, the sealed lower end portion of the body serves as a dust-proof covering that covers the bottom, and after the cutting, the remaining portion of the body that remains after the cutting forms a wall surrounding the bottom when set in the melting device. The present invention proposes a dialysis agent storage container characterized by having a bottom portion exposed downward so that it can be broken by a cutter of a dissolving device while preventing foreign matter from entering from the outside.

However, with this method, the bottom part may be torn during transportation, or the barrier properties may deteriorate at the damaged part of the bottom part. In order to meet these requirements, it is necessary to use a material with sufficient barrier properties for the bottom film, which poses problems such as increasing costs.

Patent No. 4753571

Therefore, an object of the present invention is to obtain a refill packaging bag that is easy to open and can ensure barrier properties without using a barrier film at the bottom.

The packaging bag of the present invention has a bottom film that is folded so that the sealant surfaces of the front film and the rear film face each other, and the top seal part, the left seal part, the right seal part, and the bottom part are folded with an easy-peel sealant layer inside. In a packaging bag having a bottom seal part of a gusset,
The bottom film is made of an easily breakable film consisting of at least a base paper and a sealant layer on the front and back sides thereof,
The folded and facing sealant layers of the bottom film are peelable sealants, and at the bottom, the overlapping bottom films of the bottom films, the front film, and the back film are sealed to each other,
Moreover, the packaging bag is characterized by having an unfused bottom film portion inside the bottom portion.

The packaging bag of the present invention has high barrier properties without using a bottom film with barrier properties, and has large openings to enable quick refilling.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view, a sectional view, and a partially enlarged view of an embodiment of a packaging bag according to the present invention. A vertical cross-sectional view and a partially enlarged view showing the process of peeling off the fusion bond between the easy-to-open resin layers of the bottom film and widening the bottom in order to unseal the bottom in an embodiment of the packaging bag according to the present invention. It is. FIG. 2 is a longitudinal cross-sectional view showing a state in which an expanded bottom part of an embodiment of the packaging bag according to the present invention is opened and the contents are refilled.

Hereinafter, embodiments of the packaging bag of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing an embodiment of a packaging bag 1 according to the present invention.
As shown in FIGS. 1-1 and 1-2, the packaging bag 1 of the present invention has a front film 2 and a rear film 3 with their sealant surfaces facing each other, and is surrounded by a top seal portion 11, a left side seal portion 12, and a right side seal portion. It has a sealing part 13 and a bottom sealing part 14 having a bent bottom film 4 having a sealant layer on the front side.

The bottom film 4 is made of an easily breakable film consisting of at least a base paper 41 and front and back sealant layers 42 and 43, and at the bottom seal portion, the overlapping bottom films of the bottom film 4 and the front film 2 , and the rear film 3 each form a sealed bottom.
Therefore, even if the bottom film 4 does not have barrier properties, the bottom seal portion 14 does not expose a large surface to the outside air and the inside of the packaging bag 1, so the barrier properties of the packaging bag 1 as a whole do not deteriorate.
Here, at least the sealant layer 43 folded inside the bottom film 4 is made of an easy-peel sealant or a delaminable sealant. That is, the folded and sealed bottom film 4 can be easily peeled off.

In order to open this packaging bag, it is opened in the steps shown in FIGS. 2 and 3.
Here, the bottom film 4 forming the bottom portion is manufactured to have a width sufficiently wider than twice the width of the bottom seal portion 14. For this reason, there is an unfused bottom film portion 44 inside the package, and the unfused portion is inserted in a folded state.
To open the package, first, as shown in FIG. 2-1, the fused portions of the bottom films 4 are peeled off.
The sealant layer 43 folded inside the bottom film 4 is made of an easy-peel sealant, so it can be easily peeled off, and the bottom film 4 can be unfolded and stood as shown in Figures 2-2 and 2-3. It becomes possible to stand up like a pouch.

FIG. 3 is a cross-sectional view showing the unsealed bottom film portion 44 of the bottom film 4 being opened by tearing it open at its center, and the refilling container 6 is brought into contact with the opened opening 45 to refill the contents 5. be.
The bottom film 4 does not have a highly rigid film layer such as a barrier layer, the base layer is paper, and the resin on both sides is a sealant, so it can be easily broken and opened.

The base paper used for the bottom film has a basis weight of 5 to 100 g/m ² . Preferably it is 20 to 75 g/m ² . If it is less than 5 g/m ² , there is a problem that the coating of heat seal varnish and the process of laminating an easy-peel sealant film cannot be stably manufactured. Additionally, if the thickness exceeds 100g/ ^m2 , the bottom film will become hard and difficult to fuse when sealed when folded, and the strength will be too strong, requiring force to open from the bottom. Therefore, there is a problem that it becomes difficult to open the package.

As the easy-peel sealant layer used for the bottom film, a commercially available easily peelable sealant film may be used, or a commercially available heat seal varnish may be applied. In any case, a material capable of cohesive peeling, interfacial peeling, or interlayer peeling is used.

The sealing strength between the easy-peel sealant layers of the bottom film or between the heat seal varnishes needs to be 1 to 10 N/15 mm by adjusting the sealing conditions. This is because if the sealing strength is less than 1N/15mm, a sufficient seal cannot be obtained, so the bottom film will not be folded but will open, causing problems such as a decrease in barrier properties.
Moreover, if the sealing strength is 10 N/15 mm or more, it will be difficult to open the bottom film, making it impossible to refill. For this reason, the seal strength is set to 1 to 10 N/15 mm.
Among these, a seal strength of 2 to 5 N/15 mm is particularly preferred.
In order to make it easier to open, the bottom film may be additionally scratched near the center as long as it does not break due to drop impact or vibration.

The laminated film used for the body may be a film using a biaxially stretched film such as a polyethylene terephthalate film for the outer layer, a barrier layer as the intermediate layer, and a fusible thermoplastic resin layer as the innermost layer. . For example, from the outside, a laminated film such as biaxially stretched polyethylene terephthalate film (thickness 12 μm), silicon oxide vapor-deposited polyethylene terephthalate film (thickness 12 μm), polyamide resin film (thickness 15 μm), and low-density polyethylene (thickness 50 μm). is possible.
In addition, as a barrier layer, saponified ethylene/vinyl acetate copolymer, polyamide film, etc., metal foil such as aluminum foil, metal vapor deposited film such as aluminum vapor deposited polyester film, inorganic oxide vapor deposited polyethylene terephthalate film, inorganic An oxide-deposited polyamide film or the like can be used. It may also be a laminated film using the barrier layer described above and sandwiching the front and back surfaces thereof with adhesive resin layers such as low-density polyethylene.
Furthermore, in order to improve drop strength and pinhole resistance, a polyamide layer or the like may be provided as an intermediate layer.
Furthermore, in order to laminate the intermediate layer, the layers can be laminated together using a dry lamination method via an adhesive layer.

The inorganic oxides to be vapor-deposited include metal oxides such as silicon oxide, aluminum oxide, magnesium oxide, calcium oxide, potassium oxide, tin oxide, sodium oxide, boron oxide, titanium oxide, lead oxide, zirconium oxide, and yttrium oxide. can be used. Among them, silicon oxide, aluminum oxide, magnesium oxide, etc. are preferable from the viewpoint of productivity and price.

Polyolefin resins are generally used as the sealant layer of the laminated film used for the body, and specifically, low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, high-density polyethylene, ethylene- Polyolefin resins such as vinyl acetate copolymer (EVA), ethylene-methacrylic acid copolymer (EMAA), ethylene-ethyl acrylate copolymer (EAA), ionomer, and polypropylene can be used. These resins can be formed into a film using an extruder such as a T-die or an inflation machine. It may be a single layer or multiple layers. The thickness of the film is preferably in the range of 30 to 200 μm.

As mentioned above, the configuration of the packaging bag is conceivable. For the laminated film used for the body, various materials for the bottom film were prepared to create Examples and Comparative Examples, and the containers were evaluated in terms of openability, transportation tests, drop tests, etc.

<Example 1>
The body structure of the package was the same.
That is, from the outside, the configuration is: biaxially stretched polyethylene terephthalate film (thickness 60 μm) / silicon oxide vapor-deposited polyethylene terephthalate film (thickness 12 μm) / polyamide resin film (thickness 15 μm) / linear low density polyethylene (thickness 60 μm) And so.
The size of the packaging bag was 200 mm in width and 300 mm in length.
The composition of the bottom film is low-density polyethylene (thickness 20 μm) / paper layer (basis weight 90 g/m ² ) / easy-peel sealant (thickness 20 μm), and the size of the bottom film is 200 mm in width and 80 mm in length. Then, it was folded lengthwise by 40 mm.
The sealing strength between the easy-peel sealant layers was set to 1.5 N/15 mm by adjusting the sealing conditions.

<Example 2>
The paper layer constituting the bottom film had a basis weight of 70 g/m ² . The sealing strength between the easy-peel sealant layers was set to 2.0 N/15 mm by adjusting the sealing conditions.
Other details were the same as in Example 1.

<Example 3>
The sealing strength between the easy-peel sealant layers of the bottom film was 4.5 N/15 mm by adjusting the sealing conditions.
Other details were the same as in Example 1.

<Example 4>
The sealing conditions for the easy-peel sealant layers of the bottom film were adjusted to give a seal strength of 3.3 N/15 mm.
Other details were the same as in Example 2.

<Example 5>
The composition of the bottom film was low density polyethylene (thickness: 20 μm)/paper layer (basis weight: 90 g/m ² )/heat varnish (coating amount: 4 g dry/m ² ), and after coating, it was dried at 120° C. for 2 minutes.
The sealing strength between the heat varnishes was set to 1.5N/15mm by adjusting the sealing conditions.
Other details were the same as in Example 1.

<Example 6>
The paper layer constituting the bottom film had a basis weight of 70 g/m ² .
Further, the sealing strength between the heat varnishes was set to 2.0 N/15 mm by adjusting the sealing conditions.
Other aspects were the same as in Example 5.

<Example 7>
The sealing strength between the heat varnishes on the bottom film was 4.5N/15mm by adjusting the sealing conditions.
And so.
Other aspects were the same as in Example 5.

<Example 8>
The sealing strength between the heat varnishes of the bottom film was 3.3N/15mm by adjusting the sealing conditions.
The rest was the same as in Example 6.

<Comparative example 1>
The sealing strength between the easy-peel sealant layers of the bottom film was 0.5 N/15 mm by adjusting the sealing conditions.
Other details were the same as in Example 1.

<Comparative example 2>
The sealing conditions for the easy-peel sealant layers of the bottom film were adjusted to give a seal strength of 12.1 N/15 mm.
Other details were the same as in Example 2.

<Comparative example 3>
The paper layer constituting the bottom film had a basis weight of 80 g/m ² . The sealing strength between the easy-peel sealant layers was set to 12.1 N/15 mm by adjusting the sealing conditions.
Other details were the same as in Example 1.

<Comparative example 4>
The paper layer constituting the bottom film had a basis weight of 120 g/m ² . The sealing strength between the easy-peel sealant layers was set to 3.8 N/15 mm by adjusting the sealing conditions.
Other aspects were the same as in Example 1.

<Comparative example 5>
The sealing strength between the heat varnishes of the bottom film was 0.5N/15mm by adjusting the sealing conditions.
Other aspects were the same as in Example 5.

<Comparative example 6>
The sealing strength between the heat varnishes of the bottom film was 12.1 N/15 mm by adjusting the sealing conditions.
The rest was the same as in Example 6.

<Comparative example 7>
The paper layer constituting the bottom film had a basis weight of 80 g/m ² . The sealing strength between the heat varnishes of the bottom film was 12.1 N/15 mm by adjusting the sealing conditions.
Other aspects were the same as in Example 5.

<Comparative example 8>
The paper layer constituting the bottom film had a basis weight of 120 g/m ² . The sealing strength between the heat varnishes of the bottom film was 3.8 N/15 mm by adjusting the sealing conditions.
Other aspects were the same as in Example 5.

<Evaluation method>
Before the top seal of the packaging bag was fused, 40 packaging bags each containing 200 g of wheat flour as a drug were prepared. The evaluation was performed by five male and five male examiners.

<Releasability evaluation>
The bottom sealed surface of the packaging bag filled with flour was peeled off by hand to evaluate the ease of peeling.
Those that are easy to peel off are marked as ○, and those that are difficult to peel off are marked as ×.

<Evaluation of puncturing ability>
A semicircular needle with a tip diameter of 1.0 mm and a tip shape radius of 0.5 mm is inserted into the center of the bottom film after peeling and folding, and the bottom film is easily broken. to evaluate whether it could be opened (according to JIS Z 1707 General Rules for Plastic Films for Food Packaging 7.4 Puncture Strength Test).
Items that are easy to open without force are rated ◎, items that require force but are easy to open are rated, and items that are difficult to open are rated ×.

<Vibration test evaluation>
Based on JIS Z0200, a test was conducted assuming that 10 packaging bags were placed in a cardboard box and would be transported in bulk. A random vibration test was conducted and evaluated under Level 1 conditions.
Cases in which the contents leaked from the bottom film were marked as ×, and cases in which the contents did not leak were marked as ○.

<Impact test evaluation>
Based on JIS Z0200, 10 packaging bags were placed in a cardboard box and a collective drop impact test was conducted. Evaluation was made under the condition of a fall height of 80 cm (level 1).
Cases in which the contents leaked from the bottom film were marked as ×, and cases in which the contents did not leak were marked as ○.

<Packaging bag evaluation test results>
<Releasability evaluation results>
When the bottom seal surface of the packaging bag was peeled off by hand and the ease of peeling was evaluated based on the feeling of use, Examples 1 to 8 and Comparative Examples 1, 4, 5, and 8 were easily peeled off.
Comparative Examples 2, 3, 6, and 7 could not be easily peeled off manually. The packaging bags that could not be easily peeled had a seal strength of over 10 N/15 mm.
Therefore, a packaging bag with a sealing strength of 10 N/15 mm or less was preferred.

<Piercing and unsealability evaluation results>
When I pressed a device with a conical tip into the bottom seal surface of the peeled packaging bag,
Examples 1 to 4, 6, and 8 and Comparative Examples 1 to 3, and 5 to 7 were easily punctured and opened.
However, Examples 5 and 7 required a large amount of force and were difficult to open. In Comparative Examples 4 and 8, the conical tip could not be pierced at all, and the seal could not be opened.
In the packaging bag that could hardly be opened, the basis weight of the paper in the base layer of the bottom film was 120 g/m ² . Furthermore, the packaging bag that required a large amount of force to pierce and was difficult to open was one that had a thick paper basis weight of 90 g/m ² and was folded in with a heat-seal varnished surface.

<Vibration test results>
In Comparative Examples 1 and 5, the folded portion of the bottom film peeled off. For this reason, the barrier properties were significantly reduced.
In other Examples 1 to 8 and Comparative Examples 2 to 4 and 6 to 8, no abnormality such as peeling of the bottom occurred. From the above, it is necessary to fuse the folded portion of the bottom film with a sealing strength of 1N/15mm or more.

<Impact test evaluation>
In Comparative Examples 1 and 5, the folded portion of the bottom film peeled off. For this reason, the barrier properties were significantly reduced.
In other Examples 1 to 8 and Comparative Examples 2 to 4 and 6 to 8, no abnormality such as peeling of the bottom occurred. From the above, it is necessary to fuse the folded portion of the bottom film with a sealing strength of 1N/15mm or more.

From the above results, even if the basis weight of the paper used for the base layer of the bottom film is 90 g/m ² , it is difficult to pierce. In addition, if it is thin and has a basis weight of less than 20 g/m ² , it is difficult to perform bonding and bag-making processes, and the problem of breakage is likely to occur.
Therefore, the paper used for the base layer of the bottom film should have a basis weight of 20 to 80 g/m ² so that it is easy to pierce and open.
Further, the sealing strength of 1 to 10 N/15 mm is required to fuse the folded sealants of the bottom film together.
The above results are shown in Table 1.

The packaging bag of the present invention has high barrier properties even without using a bottom film with barrier properties.
Moreover, since the bottom is hygienic and has a large opening, the packaging bag can be quickly refilled.
In particular, the bottom film has high barrier properties even though it does not contain an expensive barrier layer, so it can be manufactured at a low cost and is resistant to vibrations and shocks. The advantages of the present invention are great, such as:

1...Packaging bag 11...Top seal section 12...Left side seal section 13...Right side seal section 14... ...Bottom seal part 2...Front film 3...Rear film 4...Bottom film 41...Paper (base material) paper)
42... Sealant layer 43... Sealant layer (sealant layer folded inward)
44......Unfused bottom film portion 45...Opening 5...Contents 6...Refill container

Claims (4)

The bottom seal part of the gusset has a front film and a rear film with their sealant surfaces facing each other, a top seal part, a left seal part, a right seal part, and a bottom film that is bent with the easy-peel sealant layer inside at the bottom. In a packaging bag having
The bottom film is made of an easily breakable film consisting of at least a base paper and a sealant layer on the front and back sides thereof,
The folded and facing sealant layers of the bottom film are peelable sealants, and at the bottom, the overlapping bottom films of the bottom films, the front film, and the back film are sealed to each other,
A packaging bag characterized by having an unfused bottom film portion inside the bottom portion. 2. The packaging bag according to claim 1, wherein the peelable sealant layers facing each other when the bottom film is folded are made of an easy-peel sealant or a peelable sealant. 3. The packaging bag according to claim 1, wherein the paper used for the base layer of the bottom film has a basis weight of 20 to 80 g/ ^m2 . 3. The packaging bag according to claim 1, wherein the folded portion of the bottom film is fused to a sealing strength of 1 to 10 N/15 mm.

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