JPH0342075A - Coating method - Google Patents

Abstract

PURPOSE:To simply and surely form a coating film having an ununiformly graduated pattern by coating the decorative surface of a metallic or ceramic base material with a roll coater having a coating roll with a stuck elastic foamed body such as sponge. CONSTITUTION:The decorative surface 1 of a base material A such as a color steel sheet or cement is coated under pressing force with a roll coater B composed of a feed roll 3 and a coating roll 2 with an elastic foamed body 2a such as sponge formed along the periphery. Since the coating roll 2 has a flexibility and elasticity and pressure is applied between the base material A and the roll 2, the elastic foamed body 2a as the surface layer of the roll 2 follows the decorative surface 1 of the base material A by the elastic deformation and restoring force to carry out coating giving a graduated pattern.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for coating the decorative surface of a base material made of a metal material, ceramic material, etc. using a roll coater. More specifically, the present invention relates to a coating method capable of forming a shading pattern on a decorative surface by coating using a roll coater made of elastic foam.

[Conventional technology]

In order to improve the design of base materials made of general metal materials and ceramic materials, techniques such as adding uneven patterns, painting the uneven patterns using a flow coater, spray painting, or printing have been carried out. .

[Problem to be solved by the invention]

However, with these methods, it was not possible to obtain a sufficient three-dimensional effect. In other words, adding an uneven pattern is to add a three-dimensional effect by forming a height difference on the surface, but there is a limit to the height difference of the uneven pattern depending on the physical properties of the material. Simply increasing the height difference has the disadvantage that dirt and grime tend to adhere to the surface. Additionally, painted metal plates are sometimes embossed to form uneven patterns, but fluororesin paints in particular have poor workability and the uneven process can cause cracks in the coating, resulting in poor weather resistance. However, it had the disadvantage of being inferior in durability and corrosion resistance.

In addition, when painting on an uneven surface using a flow coater, film breaks occur on the sides of the uneven surface, and since the film thickness is uniform when painting using a flow coater or spray, it is difficult to form patterns on the decorative surface. It was difficult. Also, creating colors through printing requires large and expensive printing machines.
Furthermore, it has been impossible to easily deal with the material and size of the base material.

[Means to solve the problem]

In order to eliminate such drawbacks, the present invention coats the surface of the substrate with a roll coater having a coating roller on which elastic foam is formed at least on the surface, thereby reducing the elastic deformation and deformation of the coating roller. Resilience・
This paper proposes a coating method that uses air bubbles to apply a coating film to a decorative surface in a non-uniform shading pattern.

〔Example〕

The coating method according to the present invention will be explained in detail below using the drawings. Fig. 1 is a schematic explanatory diagram of an apparatus for carrying out the above-mentioned painting method, and A is a base material, such as a colored steel plate, zinc, etc.
It is made of metal materials such as aluminized steel plates, aluminum plates, stainless steel plates, copper plates, clad steel plates, and damping steel plates, or ceramic materials such as cement, clay, wood chip cement, and wood wool cement. B is a roll coater, which is composed of at least a coating roller 2 and a feed roller 3, and has a backup roller 4 (indicated by a dashed line) if necessary. As shown in FIG. 2(a), this coating roller 2 is made of at least an elastic foam 2a.
is formed on the outer periphery of a sponge roller, etc. made of soft foam, or a sponge, etc. is attached to the surface of a metal roller to have flexibility, elasticity, and paint retention ability due to open air bubbles. Painting is carried out by transferring the paint C held inside onto the decorative surface l of the base material A while rotating. Further, the coating roller 2 rotates substantially in synchronization with the transport speed of the base material A, and contacts the base material A so as to press it. That is,
As shown in FIG. 1, the coating roller 2 forms the decorative surface 1 through elastic deformation and restoration of the elastic foam 2a due to the flexibility and elasticity of the coating roller 2 and the pressure between the coating roller 2 and the base material A. Painting is performed according to the following. To explain further, the elastic foam 2a is made of a sponge or the like having communicating bubbles 2b, as shown in FIG. The enclosed paint C is applied to the decorative surface 1 of the base material A.
As shown in the figure, by pressing the coating roller 2 against the base material A, the paint C inside the bubbles 2b flows out and is applied. According to the paint C applied in this manner, it is possible to form a so-called melon-like shaded pattern consisting of a dark pattern C1 and a light pattern Cw, as shown in FIG. Further, FIG. 4 is an enlarged sectional view taken along the line E in FIG. 3. In addition, in order to form a uniform shading pattern on the decorative surface 1 with the paint C, it is necessary to: (1) diameter of the elastic foam 2a of the coating roller 2; (2) material (hardness) of the elastic foam 2a.
, ■The pressing force of the coating roller 2 on the base material A, ■The material and viscosity of the paint C, and ■The rotational speed of the base material A and the coating roller 2, so select these and apply the coating under optimal conditions. It is something to do. In addition, when using a base material A with an uneven pattern (embossed, etc.) formed on the decorative surface 1, such as a melon pattern, a succo pattern, a cast pattern, a Kawashibo pattern, etc., the paint C is formed into this uneven pattern. The synergistic effect of the uneven pattern and the shading pattern creates an unprecedented decorative surface. In this case, the elastic foam 2a of the coating roller 2 can reliably penetrate to the bottom of the concave portion of the uneven pattern and apply the paint C.
It is possible to form a coating film without tearing the film at the bottom corner of the recess, which is impossible with a flow coater.

Here, the operation of the coating method according to the present invention will be briefly explained. First, the base material A is a color steel plate with a thickness of 0.35 mm, and the coating roller 2 of the roll coater B is an elastic foam 2 made of soft foam on the outer peripheral surface of a metal roll.
The feed roller 3 is a metal roll, and the paint C is a fluororesin paint with a viscosity of #4.
Ford cup/115±20 at 20°C is used. Therefore, the rotational speed of the base material A and the coating roller 2 is set to 4011+/min, and as shown in FIG. 1, the base material A is sandwiched between the coating roller 2 and the backup roller 4, and the coating roller 2
The soft foam 2a is brought into contact with the base material A in a state in which it is compressed five times with respect to its outer diameter, and the paint C is applied to the base material A. Of course, the paint C is then dried and poured to the bottom to harden. Further, the paint C is constantly supplied by a paint supply machine in an amount equal to the amount of paint C to be applied to the base material A. Paint C on the decorative surface 1 formed in this way
As shown in FIGS. 3 and 4, a melon-like shading pattern was formed.

[Other Examples]

What has been described above is only one example of the coating method according to the present invention, and in the subsequent process, transparent clear, colored clear, etc. are sprayed,
It is also possible to apply with a curtain flow coater or the like.

〔Effect of the invention〕

As described above, according to the coating method of the present invention, (1) a shading pattern can be easily and reliably formed on a decorative surface;

■A coating film can be reliably formed without tearing even on decorative surfaces with uneven patterns. ■It becomes a small and inexpensive device. ■
Features such as 0 that result in panels with unprecedented design improvements,
effective.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram showing an example of an apparatus for carrying out the coating method according to the present invention, FIG. figure,
FIG. 4 is a plan view and an enlarged sectional view taken along the line E, showing a base material coated by the coating method according to the present invention. A... Base material, B... Roll coater, C... Paint,
CI...Dark pattern, Cm...Light pattern, 1...
Decorative surface, 2... coating roller. A ・ ・ ・Base material 1... Decorative surface 2... Coating roller Fig. ((L)

Claims (1)

[Claims] (1) A method of coating a decorative surface of a base material using a roll coater, characterized in that at least the surface of the coating roller of the roll coater is made of an elastic foam.