JP3031794B2 - Enamel panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an enamel panel suitable for use on a building outer wall or the like.

[0002]

2. Description of the Related Art An enamel panel in which the surface of a metal substrate is covered with an enamel layer has excellent durability and a beautiful appearance, and is therefore widely used on the outer wall of a building or in a room. Although the surface of such an enamel panel is often a smooth glossy surface, if it is used on the outer wall of a building, if there are windows, ventilation openings, signboards, etc. above it, dust adhering around it Rainwater always flows down a certain waterway due to rainwater, and dirt may adhere to the surface of the enamel panel in a waterway shape. This phenomenon is particularly remarkable in an enamel panel having a smooth surface.

On the other hand, a mat enamel panel having a matte surface is also known. Such a matt enamel panel usually uses a crystalline enamel containing TiO ₂ , and has an advantage that the adhesion of dirt is less noticeable than the enamel panel having a smooth glossy surface described above. However, such a matt enamel panel naturally has a low glossiness, and there is a wrinkle that lacks the glossy beauty inherent in the enamel panel.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and does not impair the glossy beauty of the enamel panel. It has been completed in order to provide an enamel panel that can make the panel less noticeable.

[0005]

The present invention the above object, according to an aspect of has been made to solve the surface of the enamel layer formed on the substrate, by blasting, the surface roughness R _max is 4μ
a slight irregularity to form a surface of less than m, and the gloss is characterized in that the blasting surface to maintain the gloss in excess of 30. In addition, the present invention provides a
When R _max is less than 4 μm, irregularities of 2 μm or more are formed.
The form is embodied as the enamel panel according to claim 1.
Can be

[0006] As described above, the surface of the enamel layer formed on the substrate in the present invention R _max is less than 4 [mu] m, there have
The surface roughness _Rmax is less than 4 μm and a very small blast process of 2 μm or more is performed to form irregularities that do not impair the glossiness. For that, for example, # 22
A method of blasting alumina abrasive grains with a pressure of 3 kg / cm ² can be used. By slightly blasting the surface of the enamel layer in this way, the formation of the above-mentioned water channel can be prevented, and the adhesion of dirt due to the flow of dust can be prevented to a considerable extent.

Here, R _max means a value measured by a method specified in “Surface roughness” of JIS B-0601. R _max
Is 4 μm or more, the glossiness becomes 30 or less, and the gloss intended for the present invention is lost. Since it approaches to conventional smooth surface and R _max is too small, at least R _max 2
It is preferable to make the above. Here, the glossiness is JIS Z-87
This is a value measured by a 75 ° specular gloss measurement method according to 41 “Glossiness measurement method”. By making this value larger than 30, the original gloss of the enamel panel is maintained.

[0008]

When such slight irregularities are formed on the surface of the enamel panel, the interfacial tension between the enamel and the rainwater is reduced, so that it is difficult to form a rainwater channel. In addition, since such a film as incomplete combustion gas or oil in the air is unlikely to adhere to such a surface, even if there is a window, a ventilation opening, a signboard, etc., dirt due to the flow of dust is reduced even if there is an upper part, and a long term. Aesthetics can be maintained throughout.

[0009]

Examples of the present invention will be described below. First, seven types of enamel panels shown in Table 1 were prepared. Each size was 300 x 300 mm, and a steel plate for enamel was used as the substrate.

[Table 1]

Next, half of these enamel panels are masked, and the other half is coated with # 220 alumina abrasive grains.
Blast at a pressure of 3 kg / cm ² and surface as shown in Table 2.
A blasted surface having a roughness R _max of less than 4 μm and a thickness of 2 μm or more was formed. 1-3, showing the results of measurement of the A _1, B _1, blasting surfaces of C ₁ with a surface roughness meter. It goes without saying that the masking is removed from the surface of the enamel panel before the exposure test described later.

[0011]

[Table 2]

As shown in FIG. 4, these seven enamel panels 1 are screwed and fixed together with a dummy panel to a gantry 2, and each joint 3 between the enamel panels 1 and 1 is filled with a backup agent, and then filled with a channel. Sealed with silicone-based caulking material, which is likely to cause stains. The caulking material is exposed to the outdoors after curing, 3 months, 6 months, 1 year, 2 years, 5 months
The status of fouling was assessed annually. The evaluation was performed on three items: stain degree, gloss change, and color tone change. The evaluation of the degree of staining was performed by visual comparison of the original plate, the evaluation of the change in gloss was performed by measuring the gloss, and the evaluation of the change in color tone was performed by visual comparison of the original plate. The results are shown in Tables 3 to 5, respectively.

The evaluation was based on the following criteria. [Degree of contamination] ◎: No abnormality, ○: Slight contamination but unknown from a distant position, Δ: Sag mark remains, ×: Sag mark is clear, XX:
It turns black overall. [Glossiness change] ：: 3% or less, ：: 4 to 10%, Δ: 11 to 20%, ×: 21%
Above [color tone change] ：: no change, 全 く: slight change but unknown from a distant position, Δ: slightly whitening, ×: remarkable whitening

[0014]

[Table 3]

[0015]

[Table 4]

[0016]

[Table 5]

[0017]

As is clear from the above embodiments, the enamel panel of the present invention has an enamel layer surface having an _Rmax of 4
2 μm when the surface roughness R _max is less than 4 μm.
By using a blasted surface having a glossiness of 30 m or more and a glossiness of more than 30, it is possible to prevent dust from flowing down for a long period of time without deteriorating the glossy beauty inherent in the enamel panel. This eliminates the need for periodic cleaning, and can significantly reduce maintenance costs. Moreover, the change in gloss and the change in color tone are excellent as in the conventional enamel panel.

[Brief description of the drawings]

1 is a graph showing the results of measurement with a surface roughness meter of the surface of the A ₁ blasting surface.

2 is a graph showing the results of measuring the surface of B ₁ blasted surface with a surface roughness meter.

FIG. 3 is a graph showing the results of measuring the surface of the C ₁ blast surface with a surface roughness meter.

FIG. 4 is a perspective view illustrating a state of an outdoor exposure test of an example.

[Explanation of symbols]

 Reference Signs List 1 enamel panel 2 base 3 joint 4 boundary line between blast surface and untreated surface

Claims (2)

(57) [Claims] The surface of an enamel layer formed on a substrate is blasted to have a surface roughness R _max of less than 4 μm.
Surface with slight unevenness and a glossiness of 30
An enamel panel characterized by a blasted surface that maintains a gloss exceeding the standard. 2. A surface roughness R _max of less than 4 μm and 2 μm or more.
The enamel panel according to claim 1, wherein the unevenness is formed.