JPH0977880A - Grinding agent for playing machine containing antibacterial agent and resin formed product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject grinding agent having an excellent antibacterial action and useful for pin balls by blending an antibacterial agent or a powder material treated with the antibacterial agent together with a filler and with a base thermoplastic resin, and dispersing it uniformly in spite of the small adding amount of the expensive antibacterial agent, etc. SOLUTION: This grinding agent for a playing machine containing an antibacterial agent is obtained by forming the material obtained by blending (A) a thermoplastic resin (e.g.: a polycarbonate), (B) at least the antibacterial agent or a powder material treated with the antibacterial agent, with (C) a filler (e.g.; titanium white). Further, the adding ratio of the component (B) and other adding component including (C) is preferably 1: (0.1-30) and also, it is preferable that the other adding components including the component (C) are powder and the apparent specific gravity of the other components is made as <=5 times that of the component B.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a pachinko ball,
Pelletized resin abrasive used for cleaning game machine coins, etc., operation handles and operation boards for various game machines such as pachinko machines, slot machines and smart ball machines that are touched by an unspecified number of people, storage of pachinko balls The present invention relates to resin molded products such as boxes, coin storage boxes, and prize exchange chips.

[0002]

2. Description of the Related Art There are many resin molded products used in various game machines that are touched by an unspecified number of people. For example, resin-molded products are used for a ball striking handle of a pachinko machine, a so-called dollar box for storing a pachinko ball, and the like.

Since these resin molded products are frequently touched by humans, oil and fat on hands and dirt, ashes of cigarettes, and fine dust are adhered to them. No special measures are taken for hygiene, and generally a method of maintaining cleanliness by wiping or washing is adopted.

On the other hand, pachinko balls and coins for game machines are also
Although polishing and purification are performed after collection, the atmospheric temperature during polishing is relatively high at 40 to 50 ° C, and despite the fact that various bacteria easily propagate, no special measures have been taken to prevent sterilization and proliferation. Is the reality.

[0005]

[Problems to be Solved by the Invention] It is impossible to sufficiently remove bacteria that have propagated on resin moldings for game machines, pachinko balls, coins for game machines, etc. .

Therefore, it is conceivable to perform antibacterial treatment and knead the powder into a resin molded product or a resin-made abrasive, but a large amount of expensive antibacterial treated powder is used to obtain a sufficient antibacterial effect. If you try to obtain it, the cost burden will increase.

On the other hand, if the amount of the powder used is reduced to reduce the cost, the dispersion of the powder in the resin becomes insufficient and the antibacterial effect becomes unstable.

As a general method for cost reduction,
If only the surface of a resin molded product or resin abrasive is coated with antibacterial powder, the antibacterial effect will be lost due to the disappearance of the coating layer due to scratches, abrasion, etc., and long-term response cannot be expected.

Therefore, an object of the present invention is to reduce the cost burden and to exert an antibacterial effect for a long time, with regard to an abrasive material for a game machine and a resin molded product.

[0010]

In order to solve the above problems, in the present invention, a material for a thermoplastic resin is blended with at least an antibacterial agent or an antibacterial-treated powder and a filler, and is polished for a game machine. We make materials and resin molded products.

Here, the powder subjected to antibacterial treatment refers to an inorganic powder (for example, zeolite) which is provided with antibacterial properties by containing metal ions or the like by a method such as impregnation treatment (hereinafter, this will be referred to as antibacterial treatment). Called powder).

Further, as the base thermoplastic resin, there are PC, ABS, PE, PP and the like.

The filler is preferably powder, and may also serve as a coloring agent. In the case of resin molded products, many are colored (abrasives do not need to be colored in particular).
A coloring agent will also be added together, but if the filler also serves as a coloring agent, it is not necessary to add only the coloring agent separately,
It is easy to adjust the amount added.

This filler is premixed with a small amount of antibacterial agent or antibacterial powder. At this time, if the difference between the apparent specific gravity of the filler and the apparent specific gravity of the antibacterial agent or the antibacterial powder is too large, it is difficult to mix, so it is important to approximate the difference in apparent specific gravity between the two. If it is within 5 times, uniform mixing can be expected.

From the viewpoint of improving the dispersibility of the antibacterial agent or the antibacterial powder, the larger the amount of the filler, the more preferable.
Considering the strength of products (molded resin products and resin abrasives), it is not convenient to have too many. Considering this point and the amount of the antibacterial agent or the antibacterial powder used in terms of cost, the addition ratio of the antibacterial agent or the antibacterial powder to the filler and the colorant is 1: 0.1 to 30.
Is suitable.

[0016]

[Function] When an antibacterial agent or antibacterial powder is kneaded in a resin molded product for a game machine, an antibacterial action is generated on the surface of the molded product, and propagation of various bacteria on the surface is suppressed. Pachinko balls, coins for game machines, etc. are also scratched and reduced by polishing with a polishing material in which germ growth is suppressed in the same manner.

If the antibacterial effect on the surface can be obtained without increasing the addition amount of the antibacterial agent or the antibacterial powder, the cost increase of the resin molded product or the resin abrasive can be suppressed. In the present invention, a filler is added to achieve this. That is, when the filler and the antibacterial agent or the antibacterial powder having a small apparent specific gravity are mixed in advance, the two are well mixed without being separated from each other, and the filler plays a role as a bulking agent when added to the thermoplastic resin. As a result, the antibacterial agent and the antibacterial powder are uniformly dispersed throughout the resin. Therefore, an excellent antibacterial effect can be obtained even when the amount of the expensive antibacterial agent or the like used is small, and the problem of poor sustainability of the effect when the antibacterial coating layer is provided on the surface is eliminated.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In general, many resin molded products for gaming machines are colored, and when the coloring is carried out, the resin and the colorant are preliminarily mixed with each other in a color to form a pellet. Then, the pellets are molded again by the molding machine.

In the present invention, the mixture of the antibacterial agent or the antibacterial powder and the filler, which has been mixed in a predetermined ratio at the time of the color matching, is mixed with the colorant, and the mixture is suitable for the thermoplastic resin. The mixture is mixed in various proportions, and the material after kneading, that is, the material in which the antibacterial agent and the antibacterial powder are dispersed evenly by adding the filler is pelletized. The pelletization mixes the pellets during the molding process, which further increases the effect of uniform dispersion.
Even if the amount of the antibacterial agent or antibacterial powder added is small, a sufficient antibacterial effect can be obtained.

As the abrasive, pelletized products are used as they are. Since this abrasive is not visible to the player, it does not have to be colored.

[0021]

EXAMPLES Hereinafter, more detailed examples will be described.

-Example 1-A box (so-called dollar box) containing a pachinko ball was made from the materials having the following compositions.

Material composition: thermoplastic resin (polycarbonate) 98 wt% antibacterial powder (Bakutekira product name, manufactured by Kanebo Co., Ltd.) 1 wt% coloring, filler (titanium white) 1 wt% Apparent specific gravity of antibacterial powder is 0 .4g / cm ^3, coloring it in the filler is 0.9 g / cm ^3, the difference of both apparent specific gravity was 2.25 times.

Of the above components, antibacterial powder and titanium white for coloring and filling were first mixed in a mixer. Next, the mixture and the polycarbonate resin were mixed by another mixer, and the mixture was extruded by an extruder and simultaneously cut to obtain a pellet-shaped material. And this pellet was shape | molded in the ball containing box with the molding machine.

In the ball-containing box thus produced, no color unevenness was observed on the surface, and it was judged from this that the antibacterial powder, coloring and filler were uniformly dispersed in the resin. .

Next, a 50 mm × 50 mm square sample was cut out from the bottom wall of the prototype ball-containing box for the confirmation test of the antibacterial effect.

For comparison, a ball-containing box made of only the antibacterial powder and the polycarbonate resin containing no coloring or filler was prepared, and a sample of the same size as above was cut out from the bottom wall of the box.

Then, it was examined how the Escherichia coli attached to the sample of the invention product and the sample of the comparative product changed after 24 hours.

As a result, in the sample of the invention, the viable cell count after 24 hours was drastically reduced, even though only 1 wt% of the antibacterial powder was added, confirming the effectiveness of the invention. Was done. On the other hand, in the sample of the comparative product, the viable cell count after 24 hours was rather increased, and there was no effect on sterilization and suppression of reproduction.

Example 2-A ball containing box similar to that of Example 1 was made from the materials having the following compositions by the same procedure.

Material composition: Thermoplastic resin (polystyrene) 98.8 wt% Antibacterial powder (Bakutekira product name) 0.2 wt% Filler (calcium carbonate) 1.0 wt% The apparent specific gravity of the antibacterial powder is 0. 4 g / cm ³ , that of the filler is 0.6 g / cm ³ , and the difference in apparent specific gravity between the two is
In this case, it was 1.5 times.

No unevenness in color was observed in the ball box made of this material. Also, 50mm x 5 cut out from the bottom wall
Escherichia coli adhering to the 0 mm sample piece was drastically reduced after 24 hours, and it was confirmed that the invention product has an excellent antibacterial action as in Example 1.

[0033]

As described above, the resin-made abrasive and resin molded product for gaming machines of the present invention are expensive because the antibacterial agent or the antibacterial-treated powder is mixed with the filler in the base thermoplastic resin. Even if the amount of the antibacterial agent or the antibacterial-treated powder added is small, the antibacterial agent can be uniformly dispersed to obtain an excellent antibacterial effect, and the cost required for suppressing the growth of various bacteria can be reduced.

Further, since the resin molded product and the resin abrasive also have an antibacterial action, the antibacterial effect is not lost even when the molded product and the abrasive are worn, and the long-term reliability is excellent.

Front page continued (72) Inventor Chiaki Kato 950 Noda, Kumatori-cho, Sennan-gun, Osaka Prefecture Sumitomo Electric Industries, Ltd. Kumatori Factory (72) Inventor Akio Matsuda 1-3-3 Shimaya, Konohana-ku, Osaka Sumitomo Electric Ki Industry Co., Ltd. Osaka Works (72) Inventor Akihiko Isomura 1-3 1-3 Shimaya, Konohana-ku, Osaka Sumitomo Electric Ki Industries Co., Ltd. Osaka Works (72) Inventor Shigetoshi Miyama 5 Kamikita, Hirano-ku, Osaka-shi, Osaka 7-10 Miyama Kasei Co., Ltd. (72) Takehiro Nishio 1-3-13, Sellobori, Nishi-ku, Osaka City Tomoe Kogyo Co., Ltd. Osaka Branch

Claims (3)

[Claims] 1. A pellet-shaped resin abrasive used for cleaning pachinko balls, coins for game machines, etc., and an operation handle for game machines, an operation board, a pachinko ball storage box, a coin storage box, which an unspecified number of people touch. A resin molded product such as a gift exchange chip, which is made of a material in which a thermoplastic resin and at least an antibacterial agent or a powder subjected to an antibacterial treatment and a filler are blended, And resin molded products. 2. The gaming machine according to claim 1, wherein a weight ratio of the antibacterial agent or the antibacterial-treated powder to the other additive components including the filler is 1: 0.1-30. Abrasives and resin moldings. 3. The other additive component including the filler is a powder, and the difference in apparent specific gravity of the other additive component with respect to the antibacterial agent or the antibacterial treated powder is within 5 times. Alternatively, an abrasive material for a game machine and a resin molded article according to 2.