JPH07256811A - Packaging material and packaging container using this material - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a packaging material exhibiting an excellent water vapor barrier property without having a plastic film or an aluminum layer. [Structure] A packaging material in which a vapor deposition layer 3 of silicon oxide having a thickness of 400 to 2000Å is formed on the sealing material layer 2 of a paper base material 1 provided with the sealing material layer 2. The sealing agent layer 2 is selected from a sealing agent containing a resin selected from polyester and acrylic polyol as a main component, or acrylic, vinyl chloride-vinyl acetate copolymer, urethane, polyester, melamine, and nitrified cotton. Consists of a sealing agent that is a mixture of two or more resins.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper-based packaging material having a vapor-deposited layer of silicon oxide, and more particularly to a packaging material having no aluminum layer and having an excellent water vapor barrier property.

[0002]

2. Description of the Related Art Hitherto, various types of packaging materials having a water vapor barrier property have been proposed, and a packaging material provided with an aluminum foil or an aluminum vapor deposition layer has been proposed.
It is widely used because of its excellent water vapor barrier properties. These packaging materials have a plastic film or paper as a base material, and other films or papers are laminated as needed. The water vapor barrier property (moisture permeability) of the aluminum foil is almost 0 g / m ^2.
・ Polyethylene terephthalate film with a thickness of 400 Å which is 24 hrs and has a thickness of 400 Å (thickness 1
The water vapor transmission rate of ² μm) is about 1.0 g / m ² · 24 hrs.

[0003]

However, in the packaging material having the above-mentioned plastic film or aluminum layer, the plastic film needs to be incinerated after use, but it has a high calorific value and damages the incinerator.
There was a problem that harmful gas was generated during combustion. Also,
If the aluminum layer is large, it may be difficult to dispose of in an incinerator as a lump, and it may be disadvantageous in that it is opaque. It is gradually spreading. Therefore, an object of the present invention is to provide a packaging material exhibiting excellent water vapor barrier properties even without the above-mentioned plastic film or aluminum layer.

[0004]

[Means for Solving the Problems] That is, the present invention is characterized in that a vapor deposition layer of silicon oxide is formed on the sealing agent layer of a paper base material provided with a sealing agent layer, which is a packaging material. Is.

In the present invention, the sealing agent layer is a sealing agent containing a resin selected from polyester and acrylic polyol as a main component, or acrylic, vinyl chloride-vinyl acetate copolymer, urethane, polyester and melamine. It is preferable to use a sealing agent in which two or more resins selected from nitrified cotton are mixed, and in particular, a sealing agent containing a polyester resin as a main component, a sealing agent containing an acrylic polyol resin as a main component, or acrylic. It is preferable that the resin comprises a resin, a vinyl chloride-vinyl acetate copolymer resin, and a sealing agent in which a urethane resin is mixed, or a sealing agent in which a polyester resin and a melamine resin are mixed.

Further, it is preferable that the paper base material has a clay coat layer, and the sealing agent layer is formed on the clay coat layer. And the paper base material has a basis weight of 30 to 70 g /
It is preferably m ² .

[0007]

In the packaging material of the present invention, the sealing agent layer smoothes the unevenness of the paper base material, and the vapor deposition layer of silicon oxide formed thereon is smooth and uniform. The formed vapor-deposited layer of silicon oxide realizes excellent water vapor barrier properties. In particular, when the above-mentioned specific sealing agent layer is formed, the water vapor barrier property becomes higher. Further, even when the clay coat layer is formed on the paper base material, the smoothness of the paper base material surface is enhanced and the water vapor barrier property becomes higher.

[0008]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the packaging material of the present invention, and FIG. 2 is a sectional view showing another embodiment of the packaging material of the present invention.

The packaging material of the present invention has, as a basic configuration, a paper base material 1 / a sealing agent layer 2 / a vapor deposited layer 3 of silicon oxide.

As the paper base material 1, various papers used as a paper base material for packaging can be used without particular limitation. Specifically, fine paper, art paper, coated paper, Kent paper, gravure paper, roll paper, kraft paper, imitation paper, India paper, glassine paper, tracing paper, parchment paper, medicine package paper, and other western paper, and In some cases, Japanese paper can also be used.

The paper base material 1 is preferably provided with a clay coat layer 11 (see FIG. 2) for enhancing the smoothness of the surface.
Are sold in the formed state.

The thickness of the paper substrate 1 is not particularly limited, but is preferably thin and highly flexible, and has a basis weight of 30 to 70 g.
/ M ² is preferable. If it is thinner than the above, it is difficult to manufacture the paper itself. On the other hand, if it is thicker than the above, it is difficult to form the sealing agent layer 2 described later smoothly, and as a result, a smooth (uniform) vapor deposition layer (described below) cannot be obtained, and the desired water vapor barrier property is obtained. Disappear.

In the present invention, the sealing agent layer 2 is a sealing agent containing a resin selected from polyester and acrylic polyol as a main component, or acrylic, vinyl chloride-vinyl acetate copolymer, urethane, polyester, It is preferable to use a sealing agent in which two or more resins selected from melamine and nitrified cotton are mixed, and in particular, a sealing agent containing an acrylic polyol resin as a main component, or an acrylic resin, a vinyl chloride-vinyl acetate copolymer. , And a resin mixed with urethane resin, or polyester resin,
It is preferably composed of a filling agent in which a melamine resin and a nitrification cotton resin are mixed.

The filling agent layer 2 is formed by a known method; for example, gravure coating, roll coating, direct coating, knife coating, air knife coating, kiss roll coating, dip coating, bar coating, cast coating.
(When the clay coat layer 11 is formed, the layer 1
1)). The coating amount is preferably ² to 10 g / m ² . If the coating amount is less than this, there is a problem that a smooth layer cannot be formed during coating, and in extreme cases pinholes occur, while if it is more than the above, the strength of the sealing layer itself is maintained (layer cohesion). It is necessary to prevent the occurrence of breakage and cracks).

A vapor deposition layer 3 of silicon oxide is formed on the sealing agent layer 2. The method of forming the vapor deposition layer 3 is arbitrary, and known methods such as vacuum vapor deposition, ion plating, sputtering, and plasma CVD can be adopted. The vacuum vapor deposition method can form the vapor deposition layer 3 relatively easily, and
It is economical and preferable.

The thickness of the vapor deposition layer 3 is preferably 400 to 2000Å. If the thickness is thinner than this, sufficient water vapor barrier property cannot be obtained, and on the other hand, if the thickness is thicker than the above, not only improvement of the water vapor barrier property can not be expected, but also cracks are likely to occur, rather the water vapor barrier property is rather increased. It causes damage. Further, the yellowish brown coloring becomes remarkable, which is inconvenient when transparency is required.

The above-mentioned packaging material of the present invention may be used as it is, but in general, the heat-seal lacquer 4 is used.
It is preferable to apply other materials such as heat-sealing to make a bag, or to allow another joining process such as a heat-sealing lid. The application of the heat-seal lacquer 4 may be on any side of the packaging material. Further, another base material such as a plastic film, a metal foil, or a paper can be laminated and used for this packaging material. For the purpose of the present invention, it is better not to use a plastic film or metal foil,
When it is unavoidably used, it is preferable to use the amount thereof as small as possible.

Stacking paper such as cardboard is effective in manufacturing a paper box or the like. That is, a plastic film or metal foil is used by manufacturing a box from a laminate of the packaging material of the present invention having a water vapor barrier property and a paper (for example, cardboard etc.) for imparting rigidity and strength. Needless to say, it is possible to provide a paper box having a vapor barrier property. As the cardboard to be laminated to provide such a paper box, for example, paper having a basis weight of 250 to 310 g / m ² can be used.

Further, when a bag-shaped container is made using the packaging material of the present invention, it is not necessary to laminate plastic films and the tear resistance is weaker than that of the conventional bag-shaped container using the plastic film, so that the tearing can be prevented. It has the advantage of being easy to open. To produce such a bag-shaped container, for example, the vapor deposition surface of the packaging material of the present invention (FIG. 2)
A heat-seal lacquer 4 containing a resin such as an ethylene-vinyl acetate copolymer / nitrified cotton-based resin as a main component, and a coating amount of
It may be formed at ~ 3 g / m ² and heat sealed. In the case of forming a bag-shaped container, when laminating another paper on the packaging material of the present invention as described above, it is preferable to use a paper having a basis weight of 40 to 80 g / m ² for strength,
It is preferable from the viewpoints of waist and ease of handling.

Further, the packaging material of the present invention described above has a constitution not using a plastic film, and can be used as a cover material for a tablet press-through pack (PTP package) or the like.

That is, in the PTP package, as shown in FIG. 3, a sheet of polyvinyl chloride or the like is molded to form a main body 6 having an accommodating portion 5, and the accommodating portion 5 of the main body 6 has a tablet as a content. 7 and the like are accommodated, and the lid member 8 is heat-sealed to seal the opening (accommodation portion 5). This PTP package can be taken out by breaking the lid member 8 that seals the storage unit 5 by pushing the tablet 7 or the like as the content.

To use the packaging material of the present invention as a lid material for this PTP package, for example, as described above, the heat-seal lacquer 4 is applied and formed on the vapor-deposited layer 3 or the paper base material 1 to heat it. A sealing layer may be formed (see FIG. 2). Then, the PTP package using the lid material of the present invention thus obtained, like the conventional PTP package using the lid material of the aluminum foil structure, easily breaks the lid material to form tablets or the like. You can take it out. When used for such purposes, the breaking strength of the lid material (packaging material) is 2.
It is preferable to select the material, thickness, etc. of the paper base material and other constituent materials so as to be 3 kg / cm ² or less.

Similarly, the packaging material of the present invention can be used as a mount for a blister package. By doing so, a water vapor barrier property can be imparted to the blister package as well.

Next, a specific example of the present invention will be described.

[0025] <Example 1> having a basis weight of 35g / m ² powder paper (trade name "Jinhua", Fuji processing Co., Ltd.) to the clay coat layer is formed by coating weight of 23g / m ² with a knife coating method, The following sealing material layer was formed on this layer by the gravure coating method with the following coating amount (unit: g / m ² ). After that, a thickness of 1 is formed on the sealing material layer by using a batch type vacuum vapor deposition device.
A vapor deposition layer of 000Å silicon oxide (SiO _x ) was formed (vacuum degree: 4 × 10 ^-5 Torr). For each of the obtained samples, the moisture vapor transmission rate (cup method, unit: g / m ² · 24
hrs), adhesion strength of vapor deposition layer (cellophane tape peeling method)
Was measured. The results are shown in Table 1. The adhesion strength was a sensory test, and the sensory value was expressed by a numerical value of 1 (weak) to 6 (strong).

[0026]

[Table 1]

From the above results, it can be seen that the packaging material of the present invention has a sufficient water vapor barrier property even though it has a constitution based on a paper base material that does not contain a plastic film or an aluminum layer. In particular, it can be understood that when a specific resin is used as the sealing agent layer, it has a higher water vapor barrier property.

<Example 2> No. 2 prepared in Example 1
On the silicon oxide vapor-deposited layer of the packaging material using the sealing agent of No. 7 and No. 14, apply an ethylene-vinyl acetate copolymer / nitrified cotton type heat seal agent at a coating amount of 3 g / m ^2. A heat seal layer was formed to obtain a lid material for heat seal. Using this lid material, a PTP package having a storage portion made of polyvinyl chloride as shown in FIG. 3 was prepared, and the breaking strength of the lid material when the tablets stored in this storage portion were taken out was measured. At the same time, for comparison, a conventional lid member obtained by applying the heat seal agent to a 20 μm aluminum foil was prepared and evaluated in the same manner. The results are shown in Table 2.

[0029]

[Table 2]

As can be seen from Table 2, each of the lid materials using the packaging material of the present invention has a lower breaking strength than the conventional lid materials using the aluminum foil, and the contents can be easily taken out. It was In addition, the water vapor barrier property is also practically
There was no problem.

[0031]

As described above, the packaging material of the present invention has an excellent water vapor barrier property without containing a plastic film or an aluminum layer. Therefore, it is possible to provide a packaging material that does not damage the incinerator or generate harmful gas or the like. Further, the packaging material of the present invention,
When laminated with cardboard or the like, it can be used as a material for a paper box or the like, and when it is coated with a heat-sealing agent, it can be used as a heat-sealing lid or a bag-like container, and can be widely used as a packaging material for various purposes. The packaging container obtained by molding the material obtained by the present invention has excellent water vapor barrier properties.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a packaging material of the present invention.

FIG. 2 is a sectional view showing another embodiment of the packaging material of the present invention.

FIG. 3 is a cross-sectional view showing an application example of the packaging material of the present invention.

[Explanation of symbols]

 1 ... Paper base material 11 ... Clay coat layer 2 ... Sealing agent layer 3 ... Silicon oxide vapor deposition layer 4 ... Heat seal lacquer 5 ... Storage section 6 ... Main body 7 ... Tablet 8 ... Lid material

Claims (15)

[Claims] 1. A packaging material, characterized in that a vapor deposition layer of silicon oxide is formed on the sealing agent layer of a paper base material provided with a sealing agent layer. 2. The packaging material according to claim 1, wherein the sealing agent layer is composed of a sealing agent containing a resin selected from polyester and acrylic polyol as a main component. 3. The sealing agent layer is composed of a sealing agent which is a mixture of two or more resins selected from acrylic, vinyl chloride-vinyl acetate copolymer, urethane, polyester, melamine and nitrified cotton. The packaging material according to claim 1. 4. The packaging material according to claim 3, wherein the sealing agent layer is composed of a sealing agent in which an acrylic resin, a vinyl chloride-vinyl acetate copolymer resin and a urethane resin are mixed. . 5. The packaging material according to claim 3, wherein the sealing agent layer is composed of a sealing agent in which a polyester resin and a melamine resin are mixed. 6. The paper base material has a clay coat layer, and a sealing agent layer is formed on the clay coat layer, according to any one of claims 1 to 5. Material for packaging. 7. The packaging material according to any one of claims 1 to 6, wherein the basis weight of the paper base material is 30 to 70 g / m ² . 8. The packaging material according to any one of claims 1 to 7, wherein another paper is further laminated. 9. The packaging material according to claim 1, which does not include a plastic film and / or an aluminum layer. 10. A lid member using the packaging material according to any one of claims 1 to 9. 11. A press-through pack using the lid member according to claim 10. 12. A blister package using the lid member according to claim 10. 13. A packaging container obtained by molding the packaging material according to any one of claims 1 to 9. 14. The packaging container according to claim 13, which is formed into a bag shape. 15. The packaging container according to claim 13, which is formed into a box shape.