JPH0611192Y2 - Packaging material for liquid containers - Google Patents

Description

[Detailed Description of the Invention] <Industrial field of application> The present invention relates to a packaging material used for a liquid container for storing beverages such as milk, liquor and juice, and particularly to a liquid that needs to be sterilized before filling the contents. The present invention relates to packaging materials used for containers.

<Prior Art> Conventionally, as a packaging material of this type, a laminated body mainly composed of paper and optionally laminated with a plastic film, a metal foil or the like has been used. These packaging materials are widely used by substituting the glass containers that have been used for a long time, from the viewpoints of lightness, economic efficiency, printability, transportability, and protection of contents such as light-shielding property and sealing property. Has been.

When filling the contents in a liquid container made of these conventional packaging materials, it is necessary to kill various bacteria and molds attached to the packaging material, ethylene oxide gas, γ
Sterilization and sterilization work using wire or hydrogen peroxide is performed.

<Problems to be solved by the invention> There are many steps and processes from the preparation of a conventional packaging material to its use, and it is possible to prevent adhesion of bacteria and mold to some extent However, it is impossible to fill the contents in an aseptic state, and sterilization work is indispensable especially when the contents are liquor which is easily affected by microorganisms. However, the sterilization work as described above is not only economically disadvantageous, but also the disinfectant used has a bad influence on the packaging material, and the remaining disinfectant has a bad influence on the contents and the human body. There were cases.

<Means for Solving the Problems> The present invention has been made in view of the above problems, and before molding a container, the front surface of a packaging material and the back surface of another packaging material are stacked and stored. A packaging material for a liquid container, the outermost layer of at least one surface of a substrate containing at least a paper layer,
Some of the ion-exchangeable metals of zeolite are silver, copper,
Alternatively, the packaging material for a liquid container is characterized in that an antibacterial layer made of a plastic mixed with an antibacterial zeolite obtained by substituting at least one metal selected from zinc is provided.

<Function> The antibacterial zeolite contained in the antibacterial layer provided on at least one side of the base material activates oxygen in the air, exerts antibacterial properties, and sterilizes mold and other bacteria adhering to the surface of the packaging material. .

<Example> Next, the present invention will be further described with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view showing another embodiment.

The substrate (1) used in the present invention is a laminate including at least a paper layer and a flexible sheet such as a plastic film or a metal foil laminated thereon, and various materials are used depending on the content and purpose. . In the case of the embodiment shown in FIG. 1, a laminate of paper (2) and polyethylene (3), and in the case of the other embodiment shown in FIG. 2, polyethylene (3), paper (2), polyethylene (3) ,
The aluminum foil (4), the polyester film (5) and the polyethylene (3) were laminated in this order. These base materials (1)
Can be made in the same manner as the conventionally used packaging material.

An antibacterial layer (8) made of a plastic (7) mixed with an antibacterial zeolite (6) is provided on at least one surface of the base material (1).

The antibacterial zeolite (6) used in the present invention is disclosed in JP-A-60-1810.
No. 02, JP-A-60-100504, etc., a part of the ion-exchangeable metal contained in the zeolite, substantially all, at least one selected from silver, copper, or zinc. It is obtained by ion exchange with a metal.

The antibacterial zeolite (6) can be mixed in the plastic (7) almost in the same manner as a usual filler, for example, the antibacterial zeolite (6) pulverized to a particle size of a mixable degree can be mixed with the plastic (7). Pour a predetermined amount into the pellets and stir to mix them uniformly. The amount of the antibacterial zeolite (6) mixed is preferably about 1% by weight or more in order to exert substantial antibacterial activity.

In order to provide the antibacterial layer (8) on the substrate (1), various conventionally used methods can be used.
Plastic (7) mixed with (6) is formed into a film by a method such as extrusion film forming method, and then a substrate is formed using an adhesive.
A method of sticking to (1) or superposing on the base material (1) and laminating by hot pressing is possible. Further, various processing methods are possible, such as a method in which the plastic (7) mixed with the antibacterial zeolite (6) is directly extruded on the substrate (1) for coating, or a co-extrusion method in which it is extruded together with another plastic. is there. Antibacterial layer in any case (8)
Is provided on at least one outermost layer of the base material (1).

The reason for providing the antibacterial layer (8) as the outermost layer is that antibacterial zeolite
This is because (6) exerts antibacterial properties only when it acts on oxygen in the air.

When the antibacterial layer (8) is provided on the side that becomes the inner surface when the packaging material is used, the plastic (7) mixed with the antibacterial zeolite (6) is preferably a material having heat sealing properties. In other words, the antibacterial zeolite (6) is mixed with the conventionally provided heat seal layer.

The thus obtained packaging material for a liquid container having antibacterial properties is usually wound into a roll or stacked as a sleeve cut into a predetermined shape and transported and stored. At this time, molds and other bacteria attached to the antibacterial layer (8) surface of the packaging material during printing or processing are sterilized by the action of the antibacterial zeolite. Further, when the antibacterial layer (8) is provided on only one side, even if mold, miscellaneous bacteria, etc. adhere to the surface on which the antibacterial layer (8) is not provided, the packaging material is in a roll or as described above. In a stacked state,
Since the surface of the antibacterial layer (8) is in contact with the other surface, bacteria and mold attached to the surface where the antibacterial layer (8) is not provided are also sterilized. Thus, the packaging material is always kept sterile until it is used.

<Effects of the Invention> Since the present invention has the above-described configuration, the mold and various bacteria adhering to the packaging material are sterilized by the action of the antibacterial zeolite, and the packaging material is always kept in a sterile state. Therefore, the sterilization work that was conventionally required is no longer necessary, or even when performing sterilization work, the sterilization conditions can be greatly eased, which is not only economically advantageous, but also against the contents and the human body. The influence exerted by it can be extremely reduced. Of course, it does not impair the various advantages of conventional packaging materials.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view showing another embodiment. (1) ... Substrate, (2) ... Paper (3) ... Polyethylene, (6) ... Antibacterial zeolite (7) ... Plastic, (8) ... Antibacterial layer

Claims (1)

[Scope of utility model registration request] 1. A packaging material for a liquid container, in which a front surface of a packaging material and a back surface of another packaging material are superposed and stored before molding of the container, which comprises at least one surface of a base material including at least a paper layer. The outermost layer is provided with an antibacterial layer made of a plastic mixed with an antibacterial zeolite obtained by substituting a part of the ion-exchangeable metal of zeolite with at least one metal selected from silver, copper, or zinc. A packaging material for liquid containers, characterized by: