JP7316747B2 - Packaging bag and package using the same - Google Patents

Description

TECHNICAL FIELD The present invention relates to a packaging bag and a packaging body for containing fermented foods such as ground coffee beans and miso.

2. Description of the Related Art Conventionally, as a packaging bag for containing contents that generate gas, such as ground coffee beans or miso, there has been known a bag provided with gas discharge holes for gas release.
Further, for example, Patent Literature 1 proposes a packaging bag for fermented foods in which a part of the packaging bag is formed with a gas venting hole opening to the outside.
Further, for example, Patent Literature 2 proposes a packaging bag fitted with a degassing tape.

JP-A-7-96951 JP-A-2002-308341

However, in Patent Document 1, since the gas is released from the gas vent hole of the packaging bag, external air and moisture enter, resulting in a problem that the quality of the contents in the packaging bag deteriorates. there were.
In addition, in Patent Document 2, since the gas generated in the contents inside the packaging bag is released from the degassing tape of the packaging bag, the aroma of the contents such as ground coffee beans in the packaging bag is removed. There was a problem that the ingredients were lost.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve such problems. An object of the present invention is to provide a bag and a package using the bag.

The packaging bag of the present invention for solving the above problems is composed of a laminated film including a base material layer, a gas barrier layer, an intermediate layer, and a sealant layer, and the thickness of the sealant layer is 100 μm or more. , a packaging bag made of a linear low-density polyethylene film of 200 μm or less, facing each other so that the sealant layer is on the inside, and the sealant layers are welded together at the peripheral seal portion, and The packaging bag includes a storage portion and a gas vent portion for opening, the width of the peripheral seal portion is 10 mm or more and 30 mm or less, and the seal strength of the peripheral seal portion is 100 N/ It is 15 mm or more and 200 N/15 mm or less, the intermediate layer is a biaxially oriented polyamide film, and the pressure resistance strength of the packaging bag is 0.1 kPa or more and 100 kPa or less.

Moreover, in the packaging bag described above, the shape of the packaging bag is preferably a regular polygon in plan view .

Further, a package of the present invention is a package comprising a content that generates gas and the packaging bag for containing the content, wherein the gas generated from the content in the packaging bag The internal pressure of the packaging bag is higher than the atmospheric pressure outside the packaging bag.

ADVANTAGE OF THE INVENTION According to this invention, the packaging bag which can prevent the breakage by the internal pressure of a packaging bag, and a package body using the same can be provided, while preventing the fragrance component of the content from leaking out of a packaging bag. .

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic perspective view which shows an example of the package concerning the 1st Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic plan view which shows an example of the packaging bag concerning the 1st Embodiment of this invention. 1 is a schematic cross-sectional view showing an example of a laminated film that constitutes a packaging bag according to a first embodiment of the present invention; FIG. FIG. 6 is a schematic plan view showing an example of a packaging bag according to a second embodiment of the invention;

Preferred embodiments of the present invention will be described in detail below with reference to the drawings.
[First embodiment]
(package)
In the package 30 according to the first embodiment, as shown in FIG. 1, a gas-generating content 1, such as roasted coffee, is stored in a storage portion in a packaging bag.

(packaging bag)
The packaging bag according to the first embodiment, as shown in FIG. The sealant layers at the other peripheral edge portions are welded to each other except for 6 to form the peripheral edge seal portion 3, thereby forming a bag shape.

(Laminated film)
The laminated film 10 according to the first embodiment includes a substrate layer 11, a gas barrier layer 12, an intermediate layer 13, and a sealant layer 14, as shown in FIG.

(Contents)
Contents 1 include solids that generate gas, such as coffee beans, coffee powder, fermented foods such as miso, and the like.

(Base material layer)
The base material layer 11 of the laminated film is used as an outer layer and serves as a basic material that constitutes the packaging bag. , polyester-based, polyamide-based, polypropylene-based, polycarbonate-based, and polyacetal-based resins can be used.
In addition, since the film used as the base layer is generally printed on the inner layer side of the film, printability is required, and a biaxially stretched stretched film is suitable.
The thickness of this film may be any thickness that can maintain the strength and rigidity of the basic material to the minimum necessary, and considering the cost, about 12 μm to 50 μm is appropriate.
In addition, the substrate layer may be configured to have a barrier property as a film coated with polyvinylidene chloride as necessary.

(Gas barrier layer)
For the gas barrier layer 12 of the laminated film, a synthetic resin having excellent gas barrier properties can be used. For example, polyvinylidene chloride, ethylene-vinyl alcohol copolymer, resins such as polyamides such as MXD-6 nylon, films such as ethylene-vinyl acetate copolymer saponified products, films laminated with these materials, or oxidation A film on which an inorganic substance such as silicon or aluminum oxide is vapor-deposited, a metal foil of aluminum, or the like can be used.
Among them, ethylene-vinyl alcohol copolymer film and aluminum foil are preferably used.
The thickness of the ethylene-vinyl alcohol copolymer film is preferably about 10 μm to 20 μm. If the thickness of the film is less than 10 μm, the strength of the film may be insufficient and tearing of the film may occur.
The thickness of the aluminum foil is preferably about 7 μm to 15 μm. If the thickness exceeds 15 μm or more, the aluminum foil cannot follow the deformation due to the internal pressure, and cracks may occur.

(middle layer)
For the intermediate layer 13 of the laminated film, a synthetic resin having excellent properties such as puncture resistance can be used in order to prevent the air from escaping even after long-term use. Examples include polyamide and polyethylene terephthalate. , polyolefin films such as polyethylene and polypropylene can be used.
As the above-mentioned resin film, either an unstretched film or a uniaxially or biaxially stretched stretched film can be used.
The thickness of the resin film may be such that the film strength, puncture resistance, and the like can be maintained at the minimum required thickness. If it is less than 12 μm, the film strength, puncture resistance, etc. are unfavorably lowered.
Among them, a stretched film of a polyamide-based resin is preferable. Specifically, for example, MXD nylon 6 film, MXD nylon resin and various polyamide resins such as nylon 46, nylon 6, nylon 66, nylon 610, nylon 612, nylon 11, nylon 12, etc. 2 to 3 Multilayer laminated films consisting of more than one layer can be used.

(sealant layer)
The sealant layer 14 of the laminated film is used as an inner layer, and a heat-adhesive resin can be used. For example, polypropylene-based, polyethylene-based, polyolefin-based resins such as imonomer resins, and ethylene-vinyl acetate copolymer films can be used. Among them, polyethylene-based resin is preferable from the viewpoint of sealing property.
The thickness of the resin film is preferably about 100 μm to 200 μm, more preferably about 110 μm to 150 μm, even more preferably about 130 μm to 150 μm.
If the thickness is less than 100 μm, the sealing strength may be insufficient.

(peripheral seal)
As shown in FIG. 2, the packaging bag is provided with a peripheral seal portion 3 at a predetermined position.
The seal strength of the peripheral seal portion is preferably 100 N/15 mm to 200 N/15 mm. If it is less than 100 N/15 mm, the seal may recede at the peripheral seal portion and the bag may break.

The width of the peripheral seal portion 3 is preferably about 5 mm to 30 mm, more preferably about 10 mm to 20 mm.
As a method for forming the peripheral seal portion, for example, a hot plate heat sealing method, an impulse sealing method, a fusion sealing method, an ultrasonic sealing method, a high frequency sealing method, or the like can be used.
Here, the pressure resistance strength of the packaging bag is required to be strong enough to prevent the bag from breaking even when the pressure outside the packaging bag becomes higher than the atmospheric pressure. The compressive strength of the packaging bag is preferably about 0.1 kPa to 100 kPa, more preferably about 1 kPa to 100 kPa, and even more preferably about 10 pa to 100 kPa. If the pressure is less than 0.1 kPa, if there is a pinhole or the like in a part of the packaging bag, the air inside the packaging bag may escape over time and the inside of the bag may not be at a positive pressure, allowing outside air to enter. be.

(storage part)
The storage part 4 is an inner space of the packaging bag that is surrounded by the peripheral seal part.
Although the shape of the storage portion is not particularly limited, it is preferably a regular polygon in plan view as shown in FIG. By using a regular polygon that is not less than a quadrangle, the stress due to the internal pressure can be dispersed and the pressure resistance can be further enhanced.

(Production method)
The packaging bag is placed facing each other so that the sealant layer of the laminated film is on the inside, and the laminated sheet is folded or two sheets are overlapped, and the sealant layer on the other peripheral edges is heated, leaving an opening for filling the contents. It is heat-sealed with a plate sealing machine or the like to form the first peripheral edge seal portion 31 .
Then, the contents are stored from the contents filling opening 6 of the packaging bag, and after the air in the packaging bag is degassed, the contents filling opening 6 is heat-sealed to form the second peripheral seal portion 32. be done.

[Second embodiment]
Next, a packaging bag according to a second embodiment will be described. As shown in FIG. 4, in the packaging bag according to the second embodiment, as described in the packaging bag according to the first embodiment, the laminated sheet is opposed so that the sealant layer of the laminated film is on the inside. are folded or two sheets are overlapped, and the sealant layers at the other peripheral edge portions are welded to each other to form a peripheral edge seal portion 3 to form a bag shape.
Here, in the content filling opening 6, a protruding seal portion 9 is formed which protrudes from the first peripheral edge seal portion to the storage portion and is heat-sealed.
By forming the projecting seal portion and forming the content filling opening 6 in a funnel shape, the content can be easily enclosed.

EXAMPLES The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to these ten examples.

<Example 1>
A biaxially oriented polyethylene terephthalate film (manufactured by Toyobo Co., Ltd., product name “E5102”, thickness 12 μm) as a base layer, an aluminum foil (manufactured by Toyo Aluminum Co., Ltd., product name “1N30”, thickness 7 μm) as a gas barrier layer, A biaxially oriented nylon film (manufactured by Unitika, product name “ONMB”, thickness 15 μm) as an intermediate layer, and a linear low-density polyethylene film (manufactured by Aicello, product name “L-103”, thickness 130 μm) are laminated in this order and bonded together with a dry lamination adhesive to obtain a layer structure of biaxially oriented polyethylene terephthalate film (12 μm)/adhesive layer/aluminum foil (7 μm)/adhesive layer/biaxially oriented nylon film (15 μm). / A laminated film of a linear low-density polyethylene film (130 µm) was produced.
Next, as shown in FIG. 2, the shape of the storage portion 4 is a rectangle with a side dimension of 160 mm, and the shape of the gas release portion 7 at the time of opening is on the center line of one side of the storage portion. It was cut into a rectangle having a long side dimension of 110 mm and a short side dimension of 30 mm from the edge side.
Next, as shown in FIG. 2, the two films are sealed with a hot plate sealing machine at a sealing temperature of 190 ° C. and a sealing pressure of 0.1 MPa, while facing each other with the sealant layers facing each other. A first peripheral seal portion with a seal width of 10 mm was formed in 1 second to produce a packaging bag.
This packaging bag is filled with ground coffee beans (150 g/bag) as a content, then the air in the packaging bag is degassed, and then heat-sealed under the same sealing conditions as above to form a second bag with a sealing width of 10 mm. A peripheral seal portion and a third peripheral seal portion were formed. Incidentally, the seal strength was 110 N/15 mm.
Even after storage for one month, the package obtained above was sealed in a state of positive pressure due to the gas 2 generated from the contents, and the seal did not recede or the bag was broken. was able to retain the aroma components of the ground beans. It should be noted that, when the package was opened, the gas generated from the contents could be safely released from the gas release port 7 .

<Example 2>
The procedure of Example 1 was repeated except that the gas barrier layer of Example 1 was an ethylene-vinyl alcohol copolymer film (manufactured by Kuraray Co., Ltd., product name “EF-XL”, thickness 15 μm). A laminated sheet of axially stretched polyethylene terephthalate film (12 μm)/adhesive layer/ethylene-vinyl alcohol copolymer film (15 μm)/adhesive layer/biaxially stretched nylon film (15 μm)/linear low-density polyethylene film (130 μm) made.
A package was manufactured in the same procedure as in Example 1, except for the laminated film constituting the packaging bag.
The seal strength was 110N/15mm.
Even after being stored for one month, the package obtained as described above does not recede or break even when the inside of the bag is sealed under positive pressure, and retains the aroma components of the ground coffee beans contained therein. We were able to. It should be noted that, when the package was opened, the gas generated from the contents could be safely released from the gas release port 7 .

<Example 3>
In the same procedure as in Example 1 except that the sealant layer of Example 1 was a linear low-density polyethylene film (manufactured by Aicello, product name “L-103”, thickness 100 μm), the layer structure, biaxial A laminated sheet of oriented polyethylene terephthalate film (12 μm)/adhesive layer/aluminum foil (7 μm)/adhesive layer/biaxially oriented nylon film (15 μm)/linear low-density polyethylene film (100 μm) was prepared.
A package was manufactured in the same procedure as in Example 1, except for the laminated film constituting the packaging bag.
After being stored for one month, the package obtained above was sealed in a positive pressure state, so that the aroma components of the ground coffee beans contained in the package could be retained. The seal strength was 100N/15mm. It should be noted that, when the package was opened, the gas generated from the contents could be safely released from the gas release port 7 .

<Comparative Example 1>
In the same procedure as in Example 1, except that the sealant layer of Example 1 was a linear low-density polyethylene film (manufactured by Futamura Chemical Co., Ltd., product name “LL-XMTN”, thickness 70 μm). A laminated sheet of axially stretched polyethylene terephthalate film (12 μm)/adhesive layer/aluminum foil (7 μm)/adhesive layer/biaxially stretched nylon film (15 μm)/linear low-density polyethylene film (70 μm) was prepared.
A package was manufactured in the same procedure as in Example 1, except for the laminated film constituting the packaging bag.
The package obtained above was broken and sealed during storage for one month, and therefore could not retain the aromatic components of ground coffee beans as the content.

(evaluation)
The packages used in Examples 1 to 3 and Comparative Example 1 were evaluated as follows.
A packaging bag was prepared by sealing the peripheral portion with a seal width of 10 mm, and the packaging bag was sealed after being filled with air so that the internal pressure of the packaging bag was 0.1 MPa. After storage for one month, the presence or absence of bag breakage and seal retraction was checked.
As a result, in Examples 1 and 2, no bag breakage or seal retraction was observed. Moreover, in Example 3, although the seal retreated by 1 mm due to the filled air, no bag breakage was confirmed. On the other hand, in Comparative Example 1, the bag was broken during storage for one month.

REFERENCE SIGNS LIST 1 content 2 gas generated from the content part 3 peripheral seal part 4 storage part 6 content filling opening 7 gas vent part 9 projecting seal part 10 laminated film 11 base layer 12 gas barrier layer 13 intermediate layer 14 sealant layer 20 packaging Bag 30 Package 31 First Peripheral Seal Part 32 Second Peripheral Seal Part 33 Third Peripheral Seal Part

Claims (3)

Consists of a laminated film comprising a substrate layer, a gas barrier layer, an intermediate layer, and a sealant layer,
and the sealant layer is made of a linear low-density polyethylene film having a thickness of 100 μm or more and 200 μm or less,
And a packaging bag in which the sealant layers face each other so that the sealant layers are on the inside, and the sealant layers are welded together at the peripheral seal portion,
and the packaging bag includes a storage portion and a gas vent portion when opened,
and the width of the peripheral seal portion is 10 mm or more and 30 mm or less,
and the seal strength of the peripheral seal portion is 100 N/15 mm or more and 200 N/15 mm or less,
and the intermediate layer is a biaxially stretched polyamide film,
A packaging bag , wherein the pressure resistance strength of the packaging bag is 0.1 kPa or more and 100 kPa or less . 2. The packaging bag according to claim 1 , wherein the storage portion has a regular polygonal shape in plan view . A package comprising a content that generates gas and the packaging bag according to claim 1 or 2 for containing the content,
A package, wherein the internal pressure of the packaging bag is higher than the atmospheric pressure outside the packaging bag due to the gas generated from the contents in the packaging bag.

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