JPH101130A - Paper-made container for liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deterioration in appearance due to attachment of fungus so as to prevent degradation in commodity value for a long time by adding a fungicide in a polyolefin of an outermost layer, in a paper-made container for liquid formed out of a paper whose outermost layer, at least, contains a polyolefin and a layered material which contains a polyolefin. SOLUTION: A container formed mainly out of a paper suitable for housing beverages such as sake, juice, wine, etc., is formed out of a layered material S in which a paper 2 and a polyolefin 1 are laminated. In this case, a thiabendazole as a fungicide is added in the polyolefin 1 of an outermost layer. On the inner side of the paper 2, a barrier layer 3 such as an aluminum foil, a barrier plastic film, and a metal deposition plastic film is provided. On the inner side of the barrier layer 3, a sealant layer 4 having thermal adhesive property is provided. In such a paper-made container for liquid, the outside of the container is preferably wrapped by shrink-wrapping with a gas barrier film having heat shrinkability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper-based container suitable for storing drinks such as alcohol, juice, wine and the like. The present invention relates to a liquid paper container that prevents the generation of mold and the like due to the adhesion to the outer surface of the container, and does not reduce the commercial value for a long time.

[0002]

2. Description of the Related Art In recent years, there have been many liquid paper containers, such as a gobel top type, a rectangular parallelepiped type, etc., formed from a laminated material including paper because of their light weight, ease of use, and disposability regardless of food or non-food. Used in the field. For example, a cylindrical can-shaped liquid paper container for aseptic filling of liquid is made of a laminated material in which paper and polyolefin are laminated, and the outermost layer is made of polyolefin. For example, in the aseptic filling step of a can-shaped paper container, the filling and the packaging material are each sterilized and then filled in a sterile chamber. For this reason, the container body is formed in-line, and after spraying and removing the germicide from the spout (or spout), a separately sterilized filler is filled from the spout (or spout) through the filling nozzle. I do. Thereafter, a step of sealing by heat melting a pull tab made of a laminated material of an aluminum foil and a polyolefin film is taken.

[0003] In order to take such a filling step, the filling material spilled due to jumping up from a filling nozzle or due to insufficient liquid drainage easily adheres to the upper surface of a container having a spout (or spout). This may cause growth of mold and the like, impairing the appearance and reducing the commercial value. In particular, the filler is likely to adhere to the gap between the upper part of the container where the spout (or spout) is formed and the pull tab. In solving the above problems, it is desirable not to change the mechanism of the apparatus such as the filling step and the filling nozzle in consideration of production costs and the like. Furthermore, since it is also a problem of a part corresponding to a spout (or spout) of a beverage container, it is necessary to pay sufficient attention to safety and hygiene.

[0004] In addition, even if the container is not of the type in which the content is filled from the spout (or spout) as described above, a gobel top type liquid of the type in which the content is filled from the opening of the cylindrical container material. Even in the case of paper containers, the contents spilled out of the filling nozzle due to a jumping up from the filling nozzle or a liquid shortage may adhere to the seal portion of the opening,
Also, at the stage of consumer use, if the contents are opened once, the contents are poured out, and then resealed, the residual liquid at the time of pouring adheres to the end face of the seal part or flows down from the seal part and the outer surface of the container There is a problem of sticking to. Although the cause of the liquid container containing paper as a raw material has not been clarified, there is a problem that the filling liquid easily adheres to the surface.

[0005]

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a liquid paper container which is hygienic, has no deterioration in appearance due to the adhesion of mold, and does not lose its commercial value over a long period of time. And

[0006]

SUMMARY OF THE INVENTION The present invention has been conceived in order to solve the above-mentioned problems.
In a liquid paper container comprising a laminated material containing at least the outermost layer is a polyolefin paper and polyolefin,
A liquid paper container, wherein the outermost layer of the polyolefin contains a fungicide. The invention according to claim 2 is the liquid paper container according to claim 1, wherein the fungicide is thiabendazole. The invention according to claim 3 is the liquid paper container according to claim 1, wherein the fungicide is allyl isothiocyanate. The invention according to claim 4 is characterized in that at least the outermost layer is a polyolefin paper and a liquid paper container made of a laminated material containing polyolefin, wherein the outside of the container is shrink-wrapped with a heat-shrinkable gas barrier film. A liquid paper container according to any one of claims 1 to 3. The invention according to claim 5 is the liquid paper container according to claim 4, wherein the entire outside of the container is shrink-wrapped with a heat-shrinkable gas barrier film. The invention according to claim 6 is the liquid paper container according to claim 4, wherein the outside of the container is partially shrink-wrapped with a heat-shrinkable gas barrier film.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The present invention provides a liquid paper container for liquid aseptic filling, by imparting a function in which mold and the like hardly grow to the packaging container in order to maintain hygiene of the outer surface of the container without changing the device surface such as a filling process. Solved the problem. That is, as shown in FIG. 1, the outermost layer of the polyolefin 1 of the laminated material S in which the paper 2 and the polyolefin 1 constituting the container are laminated.
Contains a fungicide, thiabendazole. In the example shown in FIG. 1, a barrier layer 3 such as an aluminum foil, a barrier plastic film, a metal-deposited plastic film, or an inorganic-deposited plastic film is provided on the inner side (content side) of the paper 2. A sealant layer 4 having thermal adhesiveness is provided inside the barrier layer 3 (on the side in contact with the contents). The combination of the layer configurations can be appropriately selected according to the type of the content and the function required thereby.

Further, thiabendazole is approved as a food additive, and is often used as an antifungal agent on the skin of fruits, and its safety has been confirmed and there is no problem in use. The addition amount of thiabendazole is suitably in the range of 0.0005 to 0.001 based on 100 of polyolefin. In the present invention, as an antifungal agent to be added to the polyolefin, besides thiabendazole, allyl isothiocyanate, silver zeolite, hinokitiol and the like can also be used. In particular, allyl isothiocyanate is an active ingredient that contributes to the antibacterial properties of natural extract of wasabi and pepper, and thus its safety has been confirmed. The amount of the allyl isothiocyanate to be added is as follows.
A range of 0.0005 to 0.001 for 00 is appropriate.

Next, an example of the form of the liquid paper container of the present invention will be described. First, a laminate material S having a layer configuration shown in FIG. 1 is punched out in a rectangular shape, folded up into a rectangular tube shape, and its ends are overlapped and bonded by means such as heat sealing. The quadrangular torso a thus opened up and down
Is formed, and a bottom member b is formed by bonding and fixing a square member to the lower end opening. Next, a top member d is formed by bonding and fixing a rectangular member having an opening c serving as a spout or a spout of a liquid (juice, liquor, wine, or the like) as a content. After filling the contents from the opening c of the liquid paper container Y1 as shown in FIG. 2 formed as described above, for example, a desired shape obtained by punching and forming from a laminated material having a sealant layer provided on an aluminum foil is used. The pull tab e is bonded to the top part e so as to cover the opening c.

After sealing with a pull tab e, the supply of oxygen is cut off by shrink-wrapping at least the top part e of the liquid paper container with a heat-shrinkable gas barrier film (not shown). The function of preventing mold growth can be further ensured. It is very sanitary because the mouth of the container is not exposed. further,
When covering with a heat-shrinkable gas barrier film, it is more effective to enclose carbon dioxide gas or nitrogen gas or the like. The gas-barrier film having heat shrinkability covers not only the top part e of the liquid paper container Y1 but also the entire container in consideration of the fungal growth preventing function. It is also preferable in consideration of workability.

Further, the shape and structure of the container are not limited to those shown in FIG. 2, and the laminated material is cut out into a substantially rectangular shape as shown in FIG. A generally known gobel-top type liquid paper container Y2 may be used, and the shape and structure of the container are not limited.
According to the present invention, thiabendazole or allyl isothiocyanate added to the polyolefin of the outermost layer of the liquid paper container acts as a fungicide, and even in a container containing paper as a material, the filling adheres to the outer surface of the container to remove mold. It is unlikely to cause the problem, and mold is not generated on the outermost layer of the liquid paper container, so that safety and cleanliness can be maintained. Further, by shrink-wrapping the container with a heat-shrinkable gas barrier film, the supply of oxygen necessary for the growth of the mold is cut off, thereby preventing the generation of the mold. At this time, if the oxygen between the outside of the container and the heat-shrinkable gas barrier film is replaced with carbon dioxide gas or nitrogen gas, the effect of preventing mold generation is further improved.

[0012]

The present invention will be specifically described below with reference to examples. <Example 1> A laminated material in which polyethylene (40 µm) into which 5 ppm of thiabendazole was kneaded was laminated on paper was cut into a piece of 10 cm x 10 cm to obtain a test piece. A suspension of black mold spores in a liquid medium was sprayed on a test piece,
The cells were cultured in a constant temperature bath at ° C. After checking a week later,
No mold growth was observed. <Comparative Example 1> A laminated material of polyethylene (40 µm) and paper was cut into a piece of 10 cm x 10 cm to obtain a test piece. The mold spore suspension was sprayed in the same manner as in Example 1 and cultured in a thermostat at 25 ° C. After 5 days, growth of the mold was observed.

<Example 2> A laminated material obtained by laminating polyethylene, into which 5 ppm of allyl isothiocyanate was kneaded, was cut into a piece of 10 cm x 10 cm to obtain a test piece. The mold spore suspension used in Example 1 was sprayed and cultured at 25 ° C. One week later, no mold growth was observed. <Comparative Example 2> Laminated material of polyethylene and paper was 10 cm
When a mold spore suspension was sprayed on a test piece cut to a size of × 10 cm and cultured at 25 ° C. in the same manner as in Example 1, the growth of the mold was confirmed one week later.

Example 3 Polyethylene (40 μm) /
Three square cylindrical liquid paper containers (A to C) made of a five-layer laminated material of paper (340 g / m ² ) / polyethylene (15 μm) / glass-deposited polyester film (15 μm) / polyethylene (60 μm); Three square tubular liquid paper containers having a composition of polyethylene (40 μm) / paper (340 g / m ² ) / polyethylene (15 μm) / glass-deposited polyester film (15 μm) / polyethylene (60 μm) kneaded with 5 ppm of thiabendazole ( DF) Prepare. Unstretched polypropylene (25μ
m) / aluminum foil (7 μm) / polyethylene (25
μm) is melted with an iron in six square tubular liquid paper containers and sealed. Black mold spores 10 ² / m
A few drops of the suspended orange juice were dropped on the upper part of the above-mentioned liquid paper container and left in a room as it was.
After dropping the bacterial suspension, the three liquid paper containers A to C were shrink-wrapped with a heat-shrinkable gas barrier film. The state after two weeks is shown in Table 1.

[0015]

[Table 1]

<Comparative Example 3> Three rectangular tubular liquid paper containers, which are the same as A to C used in Example 3, are prepared and used as liquid paper containers G to H. The same operation as in the third embodiment is performed on this,
The state after two weeks is shown in Table 2.

[0017]

[Table 2]

[0018]

According to the present invention, a fungicide, such as thiabendazole or allyl isothiocyanate, is added to the polyolefin resin in the outermost layer of the container, or the container is covered with a shrink film to form a mold on the outer surface of the container. Growth can be prevented. Thiabendazole, which is added to the polyolefin resin in the outermost layer of the container, is also used as a food additive, and allyl isothiocyanate is a natural antibacterial component, so there is no problem in food hygiene.
Therefore, it is possible to provide a liquid paper container that is hygienic and does not decrease in commercial value over a long period of time.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of a material of a liquid paper container according to the present invention.

FIG. 2 is a perspective view showing an example of a liquid paper container according to the present invention.

FIG. 3 is a perspective view showing another example of the liquid paper container according to the present invention.

[Explanation of symbols]

 1: Polyolefin 2: Barrier layer 3: Paper 4: Sealant layer S: Laminated material Y1, Y2: Liquid paper container a: Body b: Bottom c: Opening d: Top e: Pull tab

Claims (6)

[Claims] 1. A liquid paper container comprising at least an outermost layer made of paper containing polyolefin and a laminated material containing polyolefin, wherein the outermost layer of polyolefin contains a fungicide. 2. The liquid paper container according to claim 1, wherein the fungicide is thiabendazole. 3. The liquid paper container according to claim 1, wherein the fungicide is allyl isothiocyanate. 4. A liquid paper container comprising at least an outermost layer of polyolefin paper and a laminated material containing polyolefin, wherein the outside of the container is shrink-wrapped with a heat-shrinkable gas barrier film. A liquid paper container according to any one of claims 3 to 3. 5. The liquid paper container according to claim 4, wherein the entire outside of the container is shrink-wrapped with a heat-shrinkable gas barrier film. 6. The liquid paper container according to claim 4, wherein the outside of the container is partially shrink-wrapped with a heat-shrinkable gas barrier film.