JPH10278971A - Antibacterial case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase strength against friction for preventing antibacterial agent from dropping so as to maintain antibacterial effects for a long term by employing ultraviolet curing paint as ink or paint containing antibacterial agent. SOLUTION: On a case of a shape that a parallelopiped product is received and an interior of the case and a surface of the contact are in contact at the time of storing the product, ultraviolet curing antibacterial transparent varnish comprising ultraviolet curing ink (UV transparent varnish) 12 with granular inorganic-type antibacterial agent 13 dispersed is applied on at least a part of a surface of a case body 11. The inorganic-type antibacterial agent 13 has a part exposed to a surface, and when oxygen acts on it, the antibacterial agent 13 functions as photocatalyst for transforming the oxygen into activated oxygen under function of light to form a layer 14 poor in activated oxygen. Thus even if antibacterial treatment is not applied on a product itself, breeding of bacteria inside the case and on a surface of the product can be suppressed mainly by activated oxygen.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case for protecting a rectangular parallelepiped product from fungi.

[0002]

2. Description of the Related Art It is widely practiced that various products have an antibacterial action. In order to provide an antibacterial function, there are roughly two forms, a form in which an antibacterial agent is kneaded into a main material, and a form in which the antibacterial agent is applied to the product surface. The antifungal of the product itself is to prevent performance deterioration and deterioration of the product due to the generated mold, and the antibacterial of the product surface is to maintain user's hygiene. Currently, products using antibacterial agents include clothing such as socks, blankets, toothbrushes, and stationery. In the field of recording media, Japanese Patent Application Laid-Open No. 7-287955 proposes that a main body housing of a cassette tape and a case for accommodating the same are subjected to antibacterial treatment.

Japanese Patent Application Laid-Open No. 7-287995 describes a system in which an antibacterial agent is kneaded into a protective case of a recording medium for the purpose of product protection, and a system in which an antibacterial agent is applied to the inner surface of a housing. For the purpose, a method is described in which an antibacterial agent is applied to the surface of a writable label attached to a housing. As the antibacterial agent, an inorganic antibacterial agent and an organic antibacterial agent are described.

When an inorganic antibacterial agent is added to a coating and applied, the antibacterial effect can be exerted semipermanently unless the antibacterial agent falls off. However, the product is stored in a form in which it is always in contact with other products or cases. In such a case, the thermosetting ink has a low hardness of the coating film, and thus is susceptible to friction, causing abrasion of the coating film. For this reason, the antibacterial agent easily falls off, and it is difficult to maintain the initial sterilizing effect for a long time.

[0005] Organic antibacterial agents exhibit an antibacterial function due to elution and vaporization of the antibacterial component, and their effects decrease over time. Improper.

[0006] When an antibacterial ink is applied to the label surface, it has an antibacterial effect, but its writing property is remarkably deteriorated.
The original writability label cannot be fulfilled. in addition,
When the material of the label substrate is paper, the antimicrobial agent easily falls off due to rubbing with the thermosetting ink.

[0007]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to increase the hardness of an ink containing an antibacterial agent and to prevent the antibacterial agent from falling off by increasing the strength against rubbing. It is to achieve a sustained antimicrobial effect for a period.

[0008]

SUMMARY OF THE INVENTION The present invention provides an ultraviolet curable paint as an ink or paint containing an antibacterial agent, when an antibacterial treatment is applied to a case for accommodating a product having a rectangular parallelepiped shape such as a magnetic tape cassette. By adopting the above, the above-mentioned problems are solved, and the strength of the antibacterial coating film can be increased against rubbing, thereby preventing the antibacterial agent from falling off and maintaining the antibacterial curing for a long time. In particular, by applying an antibacterial UV-curable ink to the inside of the case, it is possible to disinfect the non-antibacterial product surface that is always in contact with the case, thereby impeding the writing property because it is not necessary to apply the antibacterial ink to the label surface. Not done.

In particular, when an ultraviolet curable ink (paint) is mixed with an inorganic antibacterial agent, the antibacterial action for a long time can be maintained together with the friction resistance. Further, in order to maximize the effect of the inorganic antibacterial agent, a transparent or translucent ultraviolet curable resin that easily transmits light is used. In order to obtain an antibacterial effect by arranging an antibacterial agent inside the case, it is better that the case itself is translucent or transparent. Can be expected to generate active oxygen by the inorganic antibacterial agent and thereby produce a bactericidal effect.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, an ultraviolet curable ink and an antibacterial agent are used in combination in order to realize a safe product that can withstand long-term use.

The UV-curable ink used here is:
It is composed of an ultraviolet curable oligomer, a monomer, a photopolymerization initiator, a photopolymerization accelerator, and an additive (eg, wax). As a mechanism of ultraviolet curing, the photopolymerization initiator absorbs ultraviolet energy to generate radicals, and excites oligomers and monomers. As a result, radical polymerization instantaneously proceeds in a chain, and the oligomer and the monomer are polymerized and cured. The UV-curable UV-curable ink has a higher coating strength and is more resistant to rubbing than the heat-curable ink, and thus can withstand long-term product transfer.

As the antibacterial agent to be added to the ultraviolet curable ink, an inorganic substance is suitable. In particular, a substance in which a porous substance such as zeolite carries a metal ion having an antibacterial property such as silver or copper is used. It is preferred to use. When these metal ions are adsorbed on a cell membrane protein of a microorganism, they cause a metabolic disorder in the cells and cause structural destruction of the cells, thereby suppressing growth and exerting an antibacterial action. Therefore, the bacteria that directly touch the antibacterial ink coating film are inhibited from growing by the above-described action.

However, more importantly, oxygen is converted into active oxygen having a strong antibacterial action by the photocatalytic action of this antibacterial metal. For this reason, the antibacterial agent is hardly consumed and can exhibit an antibacterial action for a long time. It is considered that active oxygen is formed in a layer thickness of several microns on the surface coated with the antibacterial UV-curable ink, is absorbed by bacteria, affects proteins in cell membranes, and causes structural destruction of cells. Therefore, by molding the case from a transparent or translucent resin and selecting the UV curable resin containing the antibacterial agent from a transparent one, the light hits the antibacterial agent sufficiently,
Active oxygen can be produced continuously. In addition, by applying antibacterial UV curable ink to the inside of the case, even if the case is opaque, it can shine light when the product is put in and taken out of the case, generating active oxygen, and the product itself does not undergo antibacterial treatment However, by suppressing the growth of bacteria inside the case and on the surface of the product mainly by active oxygen, it is possible to prevent bacteria from invading from outside during storage of the product. When the case is opaque, the antibacterial effect by metal ions is mainly used.

Although the amount of the inorganic antibacterial agent is small enough,
For example, when zeolite particles carrying silver ions or copper ions are used, they may be used in an amount of about 0.3 to 3% by weight based on the amount of the ultraviolet curable ink.

[0015]

1 and 2 are perspective views illustrating a transparent, translucent or opaque sleeve-like case which has been subjected to the antibacterial treatment of the present invention for accommodating a VHS cassette. The VHS cassette 1 is housed in an antibacterial sleeve case 2 for protection during storage and transportation. A design is applied to the outside 3 of the case in the same manner as in the related art, and a layer 5 of an ultraviolet (UV) antibacterial transparent varnish is applied to the case body 11 inside the case 4 as shown in FIG. However, the ultraviolet (UV) antibacterial transparent varnish layer 5 may be applied to the entire surface including the case outside 3 as described in the following specific examples. As shown in FIGS. 4 and 5,
The case body 11 is first formed into a sheet from a transparent, opaque or translucent ultraviolet-curable resin, and the surface of the case is corona-treated, and then the design 6 is applied with an ultraviolet-curable ink. In addition, the part of 7 is a part without a design. Next, a layer 8 of an ultraviolet curable ink (UV antibacterial transparent varnish) containing an antibacterial agent is applied to the entire inner and outer surfaces of the case body 11 having the design 6. A creasing line 9 is formed in this case, and the case is bent so that the VHS shown in FIGS.
For a sleeve-shaped case.

FIG. 6 is an enlarged sectional view of the obtained antibacterial case 2.
Shown in The case 2 is provided on the surface of the seat case body 11,
It is a layer formed of an ultraviolet (UV) antibacterial transparent varnish formed by dispersing a particulate antibacterial agent 13 in a UV transparent varnish 12, and the inorganic antibacterial agent 13 is partially exposed on the surface. When oxygen acts on this, the inorganic antibacterial agent acts as a photocatalyst to convert oxygen to active oxygen under the action of light to form a thin layer 14 of active oxygen.

Example 1 An antibacterial case was manufactured according to FIGS. 4 and 5. In this example, an opaque VHS storage plastic case was coated with an antibacterial paint made of an antibacterial ultraviolet curable ink. More specifically, polypropylene melted by adding carbon black was extruded from a nozzle to form an opaque black sheet. The surface side of this case is corona-treated and then designed with an ultraviolet curable ink. Then, the entire inner and outer surfaces of the case are coated with an ultraviolet curable ink containing the antibacterial agent (silver ion-containing zeolite) of the present invention (UV antibacterial transparent). Varnish) was applied. This case was creased and bent to produce a VHS sleeve-shaped case.

Example 2 In this example, a VHS sleeve-shaped case was manufactured according to Example 1 except that transparent polypropylene was used.

Comparative Example A VHS sleeve-shaped case was produced in the same manner as in Example 1 except that a thermosetting antibacterial transparent varnish was used instead of the ultraviolet curable ink.

The rubbing strengths of the cases of Examples 1 and 2 and Comparative Example were compared using the following vibration tester. Vibration frequency: 10 to 55 KHx cycle: One reciprocation of 10 to 55 KHx in 1 minute Vibration time: 2 hours (120 cycles) The results are comparative examples. The falling area of the curable ink was only about 1/5.

[0021]

As described above, according to the present invention, a mixture of an antibacterial agent and an ultraviolet curable ink or paint is applied to at least the inside of a case for accommodating a product. Durability is obtained. UV-curable inks have a high curing speed and good productivity. Since no solvent is required for diluting the ink, it is odorless, has no residual solvent, and has no effect on products. Since a solvent is not required, control of the film thickness is easy, and thick coating can be performed. In addition, when an inorganic antibacterial agent is mixed with an ultraviolet curable ink, the strength of the antibacterial varnish is increased, so that not only the durability of the antibacterial action is obtained but also the inorganic antibacterial agent hardly falls off. Oxygen is continuously converted to active oxygen by photocatalysis, which can exert an antibacterial effect on products in contact with or in close proximity. When the case is transparent or translucent, the photocatalytic action is improved. Further, even when the case is opaque, light can be entered by taking the product in and out, so that an antibacterial action can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a VHS cassette and a sleeve-shaped case for accommodating the VHS cassette which has been subjected to the antibacterial treatment of the present invention.

FIG. 2 is a perspective view exemplifying a sleeve-like case in which a VHS cassette is accommodated and subjected to the antibacterial treatment of the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a development view of a case according to the embodiment of the present invention.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

FIG. 6 is a partially enlarged sectional view of FIG. 4;

FIG. 7 is an enlarged sectional view similar to FIG. 4 for explaining an antibacterial action.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 VHS cassette 2 Case 3 Case outside 4 Case inside 5 Layer of ultraviolet (UV) antibacterial transparent varnish 6 Design 8 Layer of ultraviolet curing type ink (UV antibacterial transparent varnish) 9 Folding line 11 Case body 12 UV transparent varnish 13 Antibacterial agent

Claims (4)

[Claims] 1. A case in which a rectangular parallelepiped product is stored and the inside of the case and the product surface are in contact with each other when the product is stored.
An antibacterial case, wherein an antibacterial ultraviolet curable ink is applied to the case. 2. A case in which a rectangular parallelepiped product is stored and the inside of the case and the product surface are in contact with each other when the product is stored.
An antibacterial case, wherein an antibacterial ultraviolet curable ink is applied to the inside of the case. 3. A case in which a rectangular parallelepiped product is stored and the inside of the case and the product surface are in contact when the product is stored.
An antibacterial case, characterized in that a film obtained by applying an antibacterial ultraviolet curable ink to a substrate is adhered to the inside of the case. 4. The antibacterial case according to claim 1, wherein the antibacterial ultraviolet curable ink is obtained by adding porous carrier particles containing metal ions to the ultraviolet curable ink.