JP2601871Y2 - Aluminum foil package - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a package made of aluminum foil, in which external water vapor hardly permeates.

[0002]

2. Description of the Related Art Conventionally, an aluminum foil package as shown in FIG. 1 is known. This aluminum foil package comprises a container body 3 having an aluminum foil layer 1 and a lid 4 having an aluminum foil layer 2. The lid 4 is superimposed on the container body 3, and the package is heat-sealed around the periphery of the package by the heat-sealing layer 5 provided on the container body 3. In some cases, heat sealing is performed by a heat sealing layer provided on the lid 4.

[0003] Such an aluminum foil package has aluminum foil layers 1 and 2 on both the container body 3 and the lid 4, and the aluminum foil is hardly permeable to water vapor. Water vapor hardly permeates into the package. Therefore, if this package is used, the packaged contents have an advantage that the quality is hardly deteriorated by absorbing moisture in the outside air.

[0004] However, even when this aluminum foil package is used, the packaged contents may absorb moisture in the outside air, albeit in a very small amount. Generally, since the amount of moisture absorption is very small, the problem of quality deterioration of the contents does not occur.However, when packaging the contents that cause the quality deterioration only by absorbing a small amount of moisture, the problem occurs. Occurs. For example, when packaging a drug that changes in quality by reacting with water, or a test plate or a test indicator that deteriorates due to the influence of water, only a very small amount of water vapor permeates the package, and the drug or the like can be used. It becomes unusable.

[0005]

For this reason, the inventor of the present invention has proposed that even if a conventional aluminum foil package as shown in FIG. It was examined whether water vapor permeates. as a result,
At the edge of the aluminum foil package, a heat sealing layer 5,
It was found that this was because the synthetic resin film layer 7 and the adhesive layer 8 were exposed. Therefore, in the present invention, the water vapor in the outside air permeates the heat sealing layer 5 and the like by variously changing the material and thickness of the heat sealing layer 5, the synthetic resin film layer 7 and the adhesive layer 8 and the like. It is made to be difficult.

[0006]

That is, the present invention comprises a container body 3 having an aluminum foil layer 1 and a lid 4 having an aluminum foil layer 2. The container body 3 and the lid are provided. 4 is heat-sealed by a heat-sealing layer 5 provided on the container body 3 or the lid 4. In the heat-sealing part 9, the aluminum foil layer 1 and the aluminum Formed between the foil layer 2 and
The present invention relates to an aluminum foil package characterized in that the non-aluminum foil layer 6 including the heat sealing layer 5 has a moisture permeability in the plane direction of 1 μg / 20 mmφ molded product / 24 hr · atm or less.

The features of the present invention will be described with reference to FIGS. The most important feature of the present invention is that the non-aluminum foil layer 6 formed between the aluminum foil layer 1 and the aluminum foil layer 2 has a moisture permeability in the plane direction of 1 μg / 20 mmφ in the heat sealing portion 9.・ It is 24hr ・ atm or less. In the illustrated package, the non-aluminum foil layer 6 includes a heat sealing layer 5, an adhesive layer 8 for bonding the heat sealing layer 5 to the aluminum foil layer 1, and a heat sealing layer provided on the aluminum foil layer 2. In order to improve the adhesiveness with the layer 5, it is formed of three layers of a synthetic resin film layer 7 laminated and bonded to the aluminum foil layer 2. The moisture permeability of such a non-aluminum foil layer 6 in the plane direction is theoretically
It is calculated by the following equation.

That is, the amount of moisture permeation = K × [(d ₁ V ₁ + d ₂ V ₂ +
d ₃ V ₃ ) × W]. Where K is the diffusion coefficient,
d ₁ is the thickness of the heat sealing layer 5, V ₁ is the moisture permeability specific to the heat sealing layer 5, d ₂ is the thickness of the adhesive layer 8, and V ₂ is the specific moisture permeability of the adhesive layer 8. Humidity, d ₃ is the thickness of the synthetic resin film layer 7, and V ₃ is the moisture permeability inherent to the synthetic resin film layer 7. W is the length of the edge of the non-aluminum foil layer 6 exposed to the outside air. Since the diffusion coefficient K is a constant, it can be seen that the greater the thickness of the heat sealing layer 5 and the like, and the higher their inherent moisture permeability, the greater the amount of moisture permeability. Also, it can be seen that the longer the edge of the non-aluminum foil layer 6 exposed to the outside air, the greater the moisture permeability. However, the length W of the edge of the non-aluminum foil layer 6 is limited to some extent by the size and the form of the package, so that it is difficult to adopt an arbitrary value.

In view of the above, the present invention employs a material having an inherently small water vapor transmission rate as the material of the heat sealing layer 5 and the adhesive layer 8 and the like, and the thickness of the heat sealing layer 5 and the adhesive layer 8 and the like. Was made thinner. The moisture permeability of the non-aluminum foil layer 6 in the plane direction is 1 μg / 20 mmφ molded product.
It was designed to be less than 4hr · atm. Particularly preferred is a molded product of 0.8 μg / 20 mmφ / 24 hr · atm or less. The moisture permeability (H _r ) referred to in the present invention is not a theoretical value but is measured and calculated by the following measuring method. First, a package having a circular plan view as shown in FIG. 3 and a cross sectional shape as shown in FIG. 1 is prepared. This package has a diameter L of 20 mm, and the periphery thereof is a heat sealing portion 9 (hatched portion) sealed by the heat sealing layer 5. The inside (white background) of the heat sealing section 9 is hollow, and a sample in a completely dry state is stored therein. The sample may be any one that can sufficiently adsorb moisture, and any sample can be used. For example, paper or cloth is used. The package prepared in this way is stored at a relative humidity of 90% RH and a temperature of 90% RH.
Leave for 60 days in an atmosphere at 40 ° C and a pressure of 1 atm. Thereafter, the package is opened under an atmosphere of humidity of 10%, temperature of 20 ° C. and pressure of 1 atm, and the stored sample is immediately transferred to a vial, and the vial is sealed. Then, the sample is heated to a temperature of 100 ° C., and the state is maintained for 60 minutes to vaporize the moisture absorbed by the sample. The amount of vaporized water was measured by gas chromatography and the amount and G _1. On the other hand, the package containing the sample prepared and stored
The amount of water vaporized was measured in the same manner as described above except that the sample was left for 60 days in an atmosphere of 10% RH, a temperature of 20 ° C. and a pressure of 1 atm, and the amount was defined as G ₀ . Then, it is to calculate the moisture permeation amount H _r per (G ₁ -G ₀₎ / 60 made by the formula, 1 day (24 hours). In addition, the measurement conditions of the gas chromatograph when measuring the amount of moisture are as follows. That is, gas chromatography column: glass column (3mmφ × 2m), column packing material:
Sunpack A, column temperature: 160 ° C, helium flow rate: 60m
l / min, detector: TCD detector.

In the package used in the above-described measuring method, the length W of the edge of the non-aluminum foil layer 6 exposed to the outside air is different from the actual one. That is, the actual package has a diameter of 20 even if the plan view is circular.
It is not necessarily mm, and the plan view may be an ellipse or a rectangle instead of a circle. The amount of moisture permeation of such an actual package is referred to as the amount of moisture permeation (H _r ) referred to in the present invention.
That is, the following method is used to convert the unit to μg / 20 mmφ molded product / 24 hr · atm. That is, the moisture permeability (H _rr ) is measured by the above-described method using an actual package. Then, the actual length of the peripheral edge of the package is measured, and when this length is set to Z mm, it can be converted into the moisture permeability (H _r ) in the present invention by the formula of H _rr × (20π / Z). It is. That is, H _r = H _rr × (20π / Z).

In the present invention, the moisture permeability (H _r ) defined above is 1 μg / 20 mmφ molded product · 24 hr · atm or less, preferably 0.8 μg / 20 mmφ molded product · 24 hr · atm or less. The amount of moisture permeation (H _r) is 1μg / 20mmφ moldings · 24hr ·
If it exceeds atm, water vapor easily permeates in the plane direction from the edge of the non-aluminum foil layer 6 exposed in the outside air, and the packaged contents easily absorb moisture, which is not preferable. .

As a material of the heat sealing layer 5 constituting the non-aluminum foil layer 6, polypropylene, polyethylene, ionomer resin (for example, metal carboxylated polyolefin) or the like is used. Further, the thickness of the heat sealing layer 5 is preferably 50 μm or less, more preferably 30 μm or less. As a material of the adhesive layer 8, low-density polyethylene, polypropylene, or the like is used.
preferable. In particular, it is preferable not to use a urethane-based resin which is conventionally generally used as a material of the adhesive layer 8. This is because the urethane-based resin has a very high inherent moisture permeability, and as a result, the moisture permeability of the non-aluminum foil layer 6 may be significantly increased. Therefore, when using a urethane-based resin, make it extremely thin (for example, 0.2
(below μm). The thickness of the adhesive layer 8 is preferably 20 μm or less. As a material of the synthetic resin film layer 7, it is preferable to use a polypropylene film, a polyvinyl chloride film, or the like. The thickness of the synthetic resin film layer 7 is 5 μm.
The following is preferred, and generally 4 μm is more preferred. Specific examples include the following. For example, a low-density polyethylene layer having a thickness of 20 μm is used as the adhesive layer 8,
A 50 μm-thick polypropylene layer is used, and a synthetic resin film layer 7 is used to form a 4 μm-thick polypropylene-based resin layer. In this example, the moisture permeability ( _Hr ) is
0.6μg / 20mmφ molded product ・ 24hr ・ atm When a urethane-based resin layer with a thickness of 5 μm is used as the adhesive layer 8, a 50 μm-thick polypropylene layer is used as the heat sealing layer 5, and a synthetic resin film layer 7 is formed with a thickness of 4 μm.
Even if a polypropylene-based resin layer is used, the moisture permeability (H _r ) becomes 2.5 μg / 20 mmφ molded product / 24 hr · atm. In addition, a urethane-based resin layer having a thickness of 5 μm is used as the adhesive layer 8, a polyvinyl chloride layer having a thickness of 100 μm is used as the heat sealing layer 5, and a film layer 7 made of synthetic resin is used to form a 4 μm-thick polyvinyl chloride layer. When used, the moisture permeability (H _r ) is 5.4 μg / 20 mmφ molded product / 24 hr · atm.

In the above example, the non-aluminum foil layer 6
Is composed of a heat sealing layer 5, an adhesive layer 8, and a synthetic resin film layer 7, but an anchor layer (not shown) may be used instead of the adhesive layer 8. The anchor layer is formed by applying an anchor agent such as polypropylene, ionomer, ethylene copolymer resin or the like to the aluminum foil layer 1 and improving the adhesion between the aluminum foil layer 1 and the heat sealing layer 5. It is. Further, an anchor layer may be provided between the adhesive layer 8 and the aluminum foil layer 1 while using the adhesive layer 8 as it is. In this case, the anchor layer is used to improve the adhesion between the aluminum foil layer 1 and the adhesive layer 8. When an anchor layer is used, the anchor layer is also a layer constituting the non-aluminum foil layer 6, so that it is as thin as possible (for example, 0.1 μm).
Degree).

In the above-described example, the heat sealing layer 5 is laminated and bonded to the aluminum foil layer 1, but may be laminated and bonded to the aluminum foil layer 2. Furthermore, if the adhesion between the heat sealing layer 5 and the aluminum foil layer 1 or 2 is good, the adhesive layer 8 and the anchor layer may not be used. In this case, the non-aluminum foil layer 6 is composed of the heat sealing layer 5 and the synthetic resin film layer 7, and the moisture permeability is reduced by the absence of the adhesive layer 8 and the like, which is preferable.

As the aluminum foil layers 1 and 2 used in the present invention, a conventionally known aluminum foil is used, and its thickness is about 20 to 70 μm. This aluminum foil layer 1
Various over layers (not shown) may be provided on the outside of the layers 2 and 3. Also, the over layer and the aluminum foil layers 1 and 2
An adhesive layer may be used for laminating. These layers, which are provided outside the aluminum foil layers 1 and 2,
Since the non-aluminum foil layer 6 is not formed, a urethane resin having a high inherent moisture permeability may be used. The illustrated aluminum foil package comprises a container body 3 having a recess for accommodating contents therein and a flat lid 4. The lid 4 also has a recess. You may.

[0016]

As described above, in the aluminum foil package according to the present invention, the moisture permeability in the plane direction of the non-aluminum foil layer 6 exposed to the outside air is equal to or less than a certain value. Therefore, water vapor in the outside air hardly permeates into the aluminum foil package. Therefore, it is possible to prevent the medicine, the test plate, the test indicator, and the like stored in the aluminum foil package according to the present invention from absorbing moisture and being deteriorated or deteriorated. This has the effect of being able to be stored well.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of an aluminum foil package according to an example of the present invention.

FIG. 2 is a schematic enlarged cross-sectional view of a heat sealing portion 9 of the aluminum foil package shown in FIG.

FIG. 3 is a plan view of the aluminum foil package shown in FIG. 1; The hatched portion indicates the heat sealing portion 9.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Aluminum foil layer 2 Aluminum foil layer 3 Container main body 4 Lid 5 Heat sealing layer 6 Non-aluminum foil layer 9 Heat sealing part

Claims (1)

(57) [Scope of request for utility model registration] 1. A container body 3 having an aluminum foil layer 1 and a lid 4 having an aluminum foil layer 2 are provided at a peripheral portion where the container body 3 and the lid 4 are overlapped. Is heat-sealed by a heat-sealing layer 5 provided on the container body 3 or the lid 4, and formed between the aluminum foil layer 1 and the aluminum foil layer 2 in the heat-sealing portion 9. A non-aluminum foil layer 6 including the heat sealing layer 5 having a moisture permeability in a plane direction of 1 μg / 20 mmφ molded product / 24 hr · atm or less, an aluminum foil package.