JPS625458Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a construction material (hereinafter referred to as a (simply referred to as materials).

More specifically, by using a flow coater etc. on a decorative surface with a randomly distributed concave and convex pattern that is conveyed at high speed, it is easy to create a coating film with no missing parts and a uniform thickness. Pertains to materials that can be formed into

Generally, when thin metal sheets, such as colored steel sheets, are used as building materials, in order to improve their coldness and smoothness, for example, they are coated with lysine, two-tone colors, embossing, etc. to give them a three-dimensional effect. A flow coater, a roll coater, and a spray gun are used to form a coating film on this type of building material. however,
For example, as shown in Figure 1, a part of a conventional building material is enlarged approximately 10 times, the painted surface A has an uneven decorative surface.
is moved at a high speed of 50 to 100 m/min via rollers R, etc., and the uneven pattern surface B of approximately 0.8 mm is
When there is a difference in the height of C, uniform coating of paint D of about 10 to 30 microns (wet) on surface A cannot be solved simply by improving the coating method. That is, the cross section of the surface A to be painted formed by embossing is usually θ=90°, or it may be formed from hemispherical protrusions. Therefore, when the decorative surface with θ=90° passes under the flow coater E via the rollers R, etc., the viscosity of the paint surrounds the air at the back surface _C1 in the direction of travel of the convex surface. As a result, it will be built-in. That is, this built-in air expands during drying and baking of the coating film, resulting in pinholes in the coating film. Also,
Since the front C ₂ of the convex pattern surface directly collides with the paint, air is less likely to be contained in this area than in the rear C ₁ . Furthermore, the top surface of the convex pattern surface and the bottom surface of the concave pattern surface contain some air, which has the disadvantage of causing the above-mentioned drawbacks. Furthermore, it is difficult to form a uniform coating film on the surface to be coated using a roll coater. In other words, when the contour part _C3 of the concave pattern surface comes into contact with the roll, it comes after the gap in the concave pattern surface, so more paint adheres, but as a result, the contour part C3 of the convex pattern surface and the roll come into contact with the roll. Due to the impact with C ₃ , the coating film on the contour portion C ₃ becomes thinner than on other portions. Furthermore, in order to form a coating film on this type of painted surface using a spray gun, at least two or more spray guns are required, and there is a drawback that a uniform coating film cannot be formed. In other words, in order to form a uniform coating film on the side walls of the convex pattern surface regardless of the direction of movement of surface A to be painted, it is necessary to spray the paint from the front and back of the direction of movement of surface A to be painted, and the sprayed paint is Painted surface A
This is because a portion of the coating will polymerize and the coating will not be uniform.

In order to eliminate such defects, the present invention provides a material whose uneven cross-sectional shape is modified so that the paint can be coated smoothly and uniformly using a flow coater or the like.

Detailed explanation will be given below with reference to the drawings. FIG. 2 is a perspective view showing a part of the material according to the present invention, and FIGS. FIG. In the figure, reference numeral 1 has a decorative surface 2 with an uneven pattern (hereinafter simply referred to as a decorative surface) embossed with a thin metal plate. The decorative surface 2 consists of a randomly shaped concave pattern 3 and a randomly shaped convex pattern 4,
and this is an independent, continuous, or mixed distribution. To explain further, the concave pattern 3 is composed of a bottom part 3a and a side wall α formed on an inclined surface,
The convex pattern 4 has a top surface portion 4a formed on a plane and a side wall α.
It consists of Further, the side wall α is a common part of the concave pattern 3 and the convex pattern 4, and its inclination θ is set within 15 to 75 degrees with respect to the plane of the top surface portion 4a. An example is shown in FIGS. 3a to 3e. Figure 3 a is θ=75
゜, Figure b is θ = 60°, Figure c is θ = 45°, Figure d is θ
= 30°, and in figure e, θ = 15°. Note that the top part 4
The boundary portion between a, the side wall α, and the bottom surface portion 3a is not formed into an angular shape but into a somewhat curved surface. Further, the depth H of the decorative surface 2 is approximately 0.2 to 2 mm, and is often approximately 0.5 to 0.8 mm. This depth H is largely related to the conveyance speed of the thin metal plate 1, and when H=0.2 to 1 mm,
80m/min to 100m/min, and 80m/min when H=1.1 to 2mm. Furthermore, when θ is set between 15 and 75 degrees, the structure differs from the structure shown in Figure 1 with θ = 90 degrees; firstly, the surface to which the paint is applied increases;
In addition, the proportion of air stagnation on the back side of the side wall, that is, on the opposite side to the direction of movement of the decorative surface 2, is reduced. In particular, θ=
The closer the angle is to 0°, the less air is trapped. Furthermore, as shown in Fig. 3, it is possible to reduce the possibility of paint dripping or unstable paint application at the boundary between the top surface 4a and the side wall α, and to suppress collisions between the paint and the side wall α. It is something.

Next, to briefly explain the manufacturing method of the material according to the present invention, a pattern as shown in FIG. 2 was processed on a color steel plate having a thickness of 0.27 mm with H=0.5 mm. However, since θ=30°, the interval between the top surface portions 4a is wider than in the conventional case where θ=90°, resulting in an uneven pattern having a larger area than before. As a paint,
A diluent is mixed with the alkyd resin, and the temperature is set to approximately 800 centipoise (25℃) to eliminate one cause of air inclusion due to viscosity.
Assuming a 20 micron (wet) coating.
This material was conveyed at approximately 80 m/min and baked at 50°C for 6 minutes and at 200°C for 1 minute. When the material obtained under these conditions was observed, as shown in FIG. 4, a coating film 5 of uniform thickness was formed without any bubbles formed on the back surface of the side wall α.

As described above, the material according to the present invention has the great feature that even when paint is applied to a decorative surface at high speed, bubbles, wrinkles, and missing parts of the paint film do not occur in the paint film. Furthermore, there is an advantage that the coating film can be formed almost uniformly over the entire surface to be coated compared to the conventional θ=90°. Furthermore, since the contact point between the top surface of the convex pattern and the side wall, the so-called boundary portion, is a curved surface, the air does not stagnate or swirl.
Naturally, there is no adverse effect due to this when forming a coating film. It has the following characteristics.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram showing a portion of a conventionally used construction material with an uneven patterned decorative surface, enlarged (approximately 10 times), and Figure 2 is an uneven patterned decorative surface for high-speed painting according to the present invention. 3A to 3E are explanatory diagrams showing an enlarged view of the above material according to the present invention, and FIG. 4 is a part formed by forming a coating film on the material according to the present invention. FIG. 1...Thin metal plate, 2...Irregular pattern decorative surface, 3...
... Concave pattern, 4... Convex pattern, 4a... Top surface part,
α...Side wall.

Claims (1)

[Scope of utility model registration request] A thin metal plate is embossed to form a decorative surface with a concave and convex pattern, in which concave and convex patterns are randomly distributed. The pattern is formed from a flat top surface portion and the common side wall, and
The depth of the concave pattern is 0.2 to 2 mm, and the angle between the side wall surface and the plane of the top surface is inclined at 15 to 75 degrees, and the boundary between the bottom surface, the side wall, and the top surface is formed into a curved surface. A construction material having a decorative surface with an uneven pattern for high-speed painting.