JPS58206780A - Game board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a game board typified by a pachinko board.

The vertical section of a pachinko machine is usually made of plywood board 1, as shown in Figure 1.
A decorative sheet 2 is pasted on top, and nails 3 are driven onto it. Here, as shown in FIG. 2, the vertical section of the decorative sheet 2 is made by printing a design 5 on the back of a transparent resin sheet 4 such as celluloid, and then painting it white.
□A paper 7 is covered with a layer 6 interposed therebetween. Such game boards such as pachinko machines and smart balls are used in dusty and dirty environments with a lot of people coming and going, and the balls used are dirty with two parts: hand dirt, one sweat from the hands, one ball cleaning liquid, two machine oils, dust, etc. There is. Therefore, the transparent resin sheet deteriorates to fE3 in a short period of time, giving the impression that the machine is old. For this reason, the current practice is to remove dirt by hand by using cotton pads soaked in a chemical solution, but even this does not remove the dirt completely.

In addition, the buttons stamped into the transparent resin sheet will also get dirty, so they must be cleaned with acid for about 10 seconds, so the transparent resin sheet must be able to withstand the acid during that time.

Furthermore, the transparent resin sheet must be resistant to damage by balls.

Moreover, in order to satisfy the above-mentioned characteristics, the design 5 printed on the back of the transparent resin sheet in order to enjoy the game must not become unclear.

The sharpness is such that the haze value is required to be 7% or less, preferably 5% or less.

Examples of inexpensive transparent resin sheets that meet these requirements include acrylic film, polyvinyl chloride film,
Polyethylene terephthalate film, polycarbonate film, celluloid, cetyl acetyl butyrate film, etc. have been tried, but all of them have advantages and disadvantages, and celluloid, which is relatively superior among them, is currently being widely used.

The purpose of the present invention is to provide a game board that satisfies these conditions. Vinylidene fluoride resin has high polarity and is extremely easily charged, so it tends to attract dust.

In general, it was thought that if dust easily adhered to it, machine oil, sweat from hands, etc. would also easily adhere to it, and that late vinylidene fluoride wood, which was easily stained, would not be able to achieve this purpose. However, as a result of intensive research by the present inventors, it was discovered that such stains are difficult to adhere to vinylidene fluoride type side lights.

Furthermore, it has been known that vinylidene fluoride resins are durable against many chemicals, but in this case, durability is defined by the fact that 1['Il is not modified. Therefore, when the vinylidene fluoride resin is a thin film, this does not mean that it is possible to prevent the chemical solution from penetrating the underlying layer due to its osmotic action.
It was simply known that vinylidene fluoride resin itself does not undergo modification. According to the findings of the present inventors, polyvinylidene fluoride homopolymer (hereinafter referred to as PVDF) with a thickness of 1 μm immediately corrodes the base layer as detailed in the comparative example, and the base layer is Ii! - Deformation due to moisture was observed.Furthermore, vinylidene fluoride resin is a crystalline polymer and has a fast crystallization rate, so the spherulites are large and opaque, making it transparent with a haze value of 7% or less. It was also considered difficult to obtain. However, it has been found that the object of the present invention can be achieved by making the vinylidene fluoride resin layer have a limited thickness and laminating it with a methacrylic resin.

The present invention will be explained in detail below.

The cross section of the transparent resin sheet 12 (corresponding to the transparent resin sheet 4 in FIG. 2) constituting the embodiment of the present invention is as shown in FIG. 6, for example, as the surface layer 13 is made of vinylidene fluoride resin. , through a layer 14 made of methacrylic resin,
A layer 15 made of polyvinyl chloride resin is laminated.

Here, the vinylidene fluoride resin is not limited to a polyvinylidene fluoride homopolymer (hereinafter referred to as PVDF), but a copolymer containing 70 mol% or more of vinylidene fluoride and a comonomer copolymerizable with it, At least one of these chairs is coated with a composition such that IJTx=i.

The thickness of the vinylidene fluoride resin layer 13 is 2μ to 10μ, preferably tL< is 2.5 to 9μ, even more preferably 3μ to 8μ
range is used. This is because if it is thinner than the above range, the chemical solution will enter the base layers 14 and 15 while cleaning the nail, as described above, and if it is thicker than the above range, transparency will be lost.

The methacrylic resin is a resin or resin composition containing at least one of ethyl methacrylate and methyl methacrylate as a main monomer, such as methyl methacrylate homopolymer (hereinafter referred to as PMMA), ethyl methacrylate homopolymer; methyl methacrylate or ethyl methacrylate. 5 at least one of
0 mol % or more, and the main component is a copolymer containing an alkyl methacrylate other than methyl methacrylate and ethyl methacrylate, an alkyl acrylate such as methyl acrylate, ethyl acrylate, butyl acrylate, or the like as a comonomer, or at least one of these. ff
1 composition is used. Homopolymers and copolymers consisting only of the monomers listed above are preferably used, and even more preferably methyl methacrylate homopolymers,
Copolymers of methyl methacrylate and methyl acrylate and copolymers of methyl methacrylate and butyl acrylate are used. Note that the copolymer is not limited to random copolymers, and for example, kraft copolymers and the like can be used, and preferably those obtained by graft polymerizing monomers mainly containing methyl methacrylate to acrylic saturated crosslinked rubber constitute Umata Composition Armpit 1. Preferred components include antistatic resins, static eliminators, and ultraviolet absorbers.

The upper limit of the thickness of the layer made of methacrylic resin is appropriately selected within a range that does not impair transparency, and the lower limit of the thickness is not particularly limited.

The layer 14 made of methacrylic resin is in contact with the surface layer 13 in the case of FIG. An adhesive layer may be interposed between both layer 14 and layer 14. Furthermore, the layer 14 made of methacrylic fruit is made of, for example, PVDF and P%IMA.
The other layer may be a laminate of two or more layers, such as PMMA, while the layer 15 made of polyvinyl chloride face oil consists of vinyl chloride homopolymer; vinyl chloride; lua 0 mol. % or more and a monomer copolymerizable with the copolymer, or a composition mainly consisting of at least one of these, and an impact-resistance reinforcing agent,
Auxiliary agents such as plasticizers and processing aids can also be used as constituent components if necessary, but they are required to be transparent.

The layer made of polyvinyl chloride resin may not be present in the transparent resin according to the present invention, and instead of polyvinyl chloride resin, transparent resin such as polycarbonate resin, polyethylene terephthalate resin, celluloid, Cetyl acetyl butyrate resin or the like may also be used.

Although these laminates are laminated by known methods, a method of laminating by coextrusion, particularly a method of cooling the vinylidene fluoride resin layer surface by contacting a cooling roll after coextrusion lamination is preferably used.

Examples will be shown below, but these are merely explanatory materials and are not intended to limit the scope of the present invention.

Comparative Example 1 Vinylidene fluoride resin Inherent Viscositica 1.0 dl/SL (0,
4fldl 30° of 6° dimethylformamide solution
PVDF pellets (value in C), methacrylic resin manufactured by Kyowa Gas, trade name Parapera) GR, methyl methacrylate resin (Q', polyvinyl chloride resin) A compound having the following formulation was used.

Combine the above ingredients in Henschel and mixer at 120°C for 10 minutes.
Mixed for a minute to obtain a compound.

Next, the prisoners were heated to 235°C using a 32φ extruder, and [3] was heated to 40°C.
At 235°C with a φ extruder, (Q was heated to 20
It was extruded at 0°C and subjected to relaxation heat treatment using a 6-layer Fugomachi roller to a thickness of 1μ.

(B) A sheet with a layer of 4 μm and a layer of 185 μm (0 layer) was obtained.

The acid resistance test for this sheet was conducted as follows. That is, a mixed solution of 85% phosphorus m1 and 94% nitrate 4 was used as the acid, and was applied with a brush onto the surface of layer (A) of the sheet. After application, it was left as it was for 10 seconds, immediately washed with water, wiped with a cloth and air-dried, and deformation due to swelling was observed in the base layer.

Example 1 The same procedure as Comparative Example 1 was carried out except that (A) of Comparative Example 1 was changed to 4 μ and (Chi) to 172 μ. The acid resistance of this laminated sheet was tested in the same manner as Comparative Example 1. There was no observable deformation in the underlying layer, and the haze value was 4.
%Met.

The pachinko machine covered with this transparent resin sheet was set in a place where many people come and go, and after automatically circulating the pachinko balls for 8 hours a day, the balls used once each day were washed and repeated. (The cleaning method was to wash with 2% household detergent "Magiclin" (Kao Soap) in water for 5 minutes, and then wash with water for another 5 minutes. After 60 days, the top part of the pachinko machine that is the most likely to get dirty. According to JIS Z8741, the gloss retention rate near the nail was 91% when measured at a light incident angle of 60° from the seat of the sheet, and it was 88% after 90 days. No injuries were detected.

Comparative Example 2 Celluloid was used as a transparent wood TLTT sheet, but the same procedure as in the example was carried out, and the gloss retention rate was 85% after 60 days and 70% after 90 days, and although there was slight deformation in the acid resistance test. Admitted.

Examples 2 to 4 The W layer of Example 1 was 2 μ, 3 μ, and 10 μ, respectively, and the C
) layers 174μ and 173μ, respectively.

The same procedure as in Example 1 was carried out except that the thickness was 166μ, and the clouding was 28% and 35%, respectively.

It was 6.5%.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a conventional pachinko machine, and 21 yen shows a cross section of the decorative sheet 2 shown in FIG. FIG. 3 shows a cross section of a transparent resin sheet according to the present invention corresponding to 4tC of the transparent resin sheet in FIG. 2. 1... Plywood board, 2... Decorative sheet, 3... Nails,
4... Transparent resin sheet, 5... Design, 6... White painted tube, 7... Paper, 12... Transparent resin sheet, 13
...Surface layer (vinylidene fluoride resin layer), 14...
Methacrylic yarn 1 resin layer, 15...polycyclized vinyl resin layer. Agents: Kiyose Sanbe 1st Director Takuo Adachi 1 Figure 3 Figure 1 Figure 1, L Figure

Claims (3)

[Claims] (1) A game board in which a transparent resin sheet is a laminate of at least two layers, a surface layer made of a vinylidene fluoride resin and a layer made of a methacrylic resin, each having a thickness of 2 to 10 μm. (2) The game board according to claim 1, characterized in that the layer made of methacrylic side light is in contact with the surface layer. (3) The game board according to any one of claims 1 to 2, wherein the vinylidene fluoride resin is made of a polyvinylidene fluoride homopolymer having a thickness of 3 to 5 μm.