JP2720666B2 - Pattern coating film forming equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for forming a pattern on a paint film, in which a powder magnetic material contained in a paint is oriented variously by the action of magnetic force to form a pattern on the paint film.

[0002]

2. Description of the Related Art Conventionally, as a method of forming a pattern such as a character, a mark or a pattern on a coating film surface, an adhesive tape having a predetermined pattern printed thereon is attached to the coating film surface,
There has been known a method of covering a coating film surface with a masking paper from which a predetermined pattern portion has been cut, and further applying a coating material thereon. However, in any of the methods for forming such a pattern, a step due to the adhesive tape or the coating film occurs on the coating film surface, which is not only unfavorable in appearance, but also requires a great deal of labor and time to stick the adhesive tape or masking paper. Therefore, there is a problem in cost. In addition, dust and the like adhere to the step portions of the pattern, making cleaning difficult, and the adhesive tape or the coating film may peel off from the step portions.

In order to solve such a problem, there has been proposed a method of mixing a powdery magnetic material into a paint and orienting the magnetic material using a magnet, thereby forming a desired pattern in a coating film. Have been. Conventionally, this type of technology has
For example, there is one described in JP-A-63-175670. This pattern coating film forming method is to form a liquid coating film containing a powdery magnetic material on the surface of an object to be coated or the like,
A method of forming a pattern by applying a magnet to a magnetic material of a target portion while the coating film is in a fluid state, wherein the size of the target pattern and By applying a magnetic force to the shape with a magnet, the pattern is formed by changing the orientation of the magnetic material only in the part that has been affected by the magnetic force among the powdered magnetic materials that are uniformly dispersed throughout the coating film with other parts Is what you do.

[0004]

When a pattern is formed on a coating film surface by orienting a powdery magnetic material in a paint using a magnet, a pattern corresponding to the shape of the outer peripheral portion of the magnet is required. Is formed, but when the magnet has an acute angle portion such as a corner portion thereof,
It was found that when a pattern coating film was formed using the magnet, a pattern different from the outer peripheral shape of the magnet, that is, a pattern boundary line was formed. Similarly, when a plurality of magnets are arranged close to each other, each magnet will affect the magnetic force of the other magnet, forming a pattern that matches the outer peripheral shape of each magnet. There was something I could not do. The present invention has been made in view of such problems of the related art, and has as its object to form an ideal pattern on the surface of an object to be coated.

[0005]

In order to achieve the above object, the present invention provides a method in which a magnet is disposed on the back side of an object to be coated, and a paint containing a magnetic material in powder form is coated on the object to be coated made of a non-magnetic material. A pattern coating film forming apparatus that forms a pattern corresponding to the outer peripheral portion of the magnet on the surface of the article to be applied by applying to the surface, wherein the outer peripheral portion of the magnet is provided on the surface of the article to be coated. An apparatus for forming a pattern coating film, wherein a modified notch portion for reducing a magnetic force displaced with respect to an ideal pattern boundary line to be formed is formed.

[0006]

In order to form a patterned coating film on the surface of the object to be coated, a magnet having a notch is used, and the magnetic material is included in a state where the magnet is arranged on the back surface of the object to be coated. The applied paint is applied to the surface of the object. As a result, the magnetic material in a portion corresponding to the shape of the outer peripheral portion of the magnet is highly densely oriented by strong magnetic force, and a pattern boundary line corresponding to the shape of the outer peripheral portion of the magnet is formed on the coating film surface. As described above, a notch portion for correction is formed in a portion where the magnetic force is stronger than other portions, so that a pattern coating film having a desired shape is formed on the surface of the object to be coated.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing one embodiment of the present invention,
FIG. 2 is a process chart showing a method for forming a pattern coating using the apparatus for forming a pattern coating according to the present invention. As shown in FIG. 1, the pattern coating film forming apparatus according to the present embodiment includes a support 11 made of a non-magnetic material such as FRP, aluminum, or gypsum. A plate-like magnet 21 having an outer peripheral portion substantially corresponding to the shape of a pattern to be formed on the surface Wa of the article to be coated W is mounted on the substrate. The magnet 21 is, as shown in FIG.
The elastic member 13 and the magnet 21 are accommodated in the concave portion 12 formed on the base 1 via an elastic body 13 made of urethane foam or the like, and are bonded to the support base 11 by an adhesive or the like. Thereby, when the article to be coated W is placed on the support 11, as shown in FIG. 3, even if there is a step S between the surface of the support 11 and the surface of the magnet 21, The surface of the magnet 21 surely adheres to the back surface of the workpiece W. If the object to be coated W is curved, the magnet 21 is curved corresponding to the curved surface. As the magnet 21, it is desirable to use a flexible magnet rubber (a ferrite magnet based on nitrile rubber) or the like.

Next, a specific example in which a pattern coating film is formed on the surface Wa of the article to be coated W by using the pattern coating film forming apparatus thus configured will be described. First, the object to be coated according to the present embodiment is a base material for forming the pattern coating film of the present embodiment and is made of a non-magnetic material. The specific material and shape are not particularly limited, and plastic, aluminum, or the like can be used. Examples of automotive parts include exterior parts such as bumpers, stripe tapes, protection moldings, front grilles, rear grilles, wheel covers, vent louvers, and interior parts such as instrument panels. These objects to be coated may be subjected to pretreatment, undercoating, or intermediate coating as needed.

The paint according to the present embodiment is a two-coat 1 in which a base paint and a clear paint are applied wet-on-wet.
Bake type paint. The base paint is a liquid paint in which a powdered magnetic material is mixed in a paint containing a vehicle component and a solvent as main components, and contains a coloring pigment, a dye, an aluminum powder, a pearl pigment, mica, etc. as necessary. can do. As a vehicle component, a normal coating resin can be used, and a resin that is dried or reacted and cured at room temperature,
Examples of the resin include a resin that is cured or melted by heating.
Specifically, alkyd resin, polyester resin, acrylic resin, urethane resin, vinyl resin, amino resin, epoxy resin, phenol resin and the like are preferable. Examples of the solvent include an organic solvent and water. As the form of the paint, organic solvent type, non-aqueous dispersion type, aqueous solution type,
A liquid such as an emulsion type may be used. The powder magnetic material is a powder whose orientation is changed by a magnetic force, and for example, a powder of nickel, stainless steel having a high iron content, iron, or the like is preferable. The shape of the magnetic material is scaly, thin,
The magnetic material may have any size such as a granular shape.
0 μm. The mixing ratio of the powdered magnetic material is 1 to 3 with respect to 100 parts by weight (solid content) of the above-described vehicle component.
0 parts by weight, especially 10 to 20 parts by weight is preferred.

The clear paint according to the present embodiment is a liquid paint in which a powdered magnetic material is mixed in a paint containing a vehicle component and a solvent as main components, and a normal paint resin is used as the vehicle component. And resins that dry or react and cure at room temperature, and resins that cure or melt when heated. Specifically, an alkyd resin, a polyester resin, an acrylic resin, a urethane resin, a vinyl resin, an amino resin, an epoxy resin, a phenol resin, and the like are preferable, and it is more preferable to use the same resin as the vehicle component of the base paint described above. Examples of the solvent include an organic solvent and water. Examples of the form of the paint include liquids such as an organic solvent type, a non-aqueous dispersion type, an aqueous solution type and an emulsion type. The paint used in the present invention is not limited to the two-coat one-bake paint described above, but may be a one-coat one-bake paint.

Next, the procedure for forming the pattern coating film and the operation of the pattern coating film forming apparatus will be described. As shown in FIGS. 1 and 3, an object W, which has been subjected to pretreatment, undercoating, intermediate coating, or the like, as required, is brought into contact with the back surface Wb of the surface of the magnet 21 so as to contact the support base 11. Place on top of. At this time, only the magnet 21 is brought into close contact with the back surface Wb of the object to be coated W by the action of the elastic body 13 as shown in FIG. After attaching the magnet 21 to the back surface Wb of the workpiece W in this manner, the base paint 16 containing the powdery magnetic material 15 is
A dry film thickness of 15 on the surface of the object to be coated W, ie, the coated surface Wa
It is applied so as to have a thickness of 35 μm. At this time, as shown in FIG. 4, the magnetic force generated from the magnet 21 is
6 acts on the powdered magnetic material 15, and the powdered magnetic material 15 starts to be oriented in the base paint 16 having fluidity.

At a predetermined time interval (preferably 3 to 5 minutes) after the application of the base paint 16, a clear paint 17 is applied on the base paint 16 to a dry film thickness of 15 to 35 μm.
Apply so that Even while the clear paint 17 is being applied, the magnetic force acts on the powdered magnetic material 15 from the magnet 21, and as shown in FIG. 4, the orientation of the powdered magnetic material 15 continues to advance. The solvent contained in the base paint 16 is applied to the clear paint 17 applied wet-on-wet.
Solvents having a lower boiling point and faster drying than solvents used for solid paints and clear paints are used due to restrictions on compatibility with water and equipment conditions such as a coating booth. Therefore, the coating viscosity of the base paint 16 increases between the application of the base paint 16 and the application of the clear paint 17, whereby the orientation of the powder magnetic material 15 is temporarily suppressed. In the present embodiment, since the magnet 21 is attached even while the clear paint 17 is being applied, the solvent contained in the clear paint 17 permeates into the base paint 16 and is once coated with the base paint 16. The viscosity is reduced, whereby the orientation of the powdery magnetic material 15 is promoted again.
After applying the clear paint 17, the work W is removed from the support base 11 after a lapse of a predetermined time (for example, 5 minutes), and the base paint 16 and the clear paint 17 are baked under predetermined drying conditions in this state.

Powdery magnetic material 15 at the time of application of paint
Occurs as follows. That is, as shown in FIG. 4, in a portion where no magnetic force is applied or where the effect of magnetic force is relatively weak, the powdered magnetic material 15 is coated with the base paint in the same manner as when the coating is performed without attaching the magnet 21. 16 randomly arranged. On the other hand, the powder magnetic material 15 is oriented along the line of magnetic force at the portion where the magnet 21 is attached and the magnetic force is acting.
In particular, since the outer peripheral portion 18 of the magnet 21 has a strong magnetic force, the powder magnetic material 15 is attracted to the vicinity of the outer peripheral portion 18 to increase the density of the powder. On the other hand, in the central portion 19 of the magnet 21, the magnetic force lines act substantially perpendicularly to the coating film, so that the powdered magnetic material 15 stands upright. Therefore, when observing the formed pattern coating film, the density of the powdery magnetic material 15 becomes high along the outer peripheral portion 18 of the magnet 21, and the color of the magnetic material becomes strong in this portion. Also, the central portion 1 of the magnet 21
9 has a dark color because the reflected light is weak because the magnetic material 15 is upright. As a result, a pattern boundary corresponding to the outer peripheral portion of the magnet 21 is formed on the surface Wa of the workpiece W.

By utilizing such an orientation effect, a pattern corresponding to the shape of the outer peripheral portion of the magnet 21 is formed on the surface Wa of the article to be coated W, for example, as shown in FIG. In order to form such an ideal pattern boundary line L on the surface of the workpiece W, the magnet 21a having an outer peripheral shape coinciding with the boundary line L is formed.
5, a portion M different from the ideal pattern boundary line is formed as shown in FIG. 5D, and the boundary line L is apparently bent. The reason for this is shown in FIG.
The corners of the magnet 21a processed into the shape shown in FIG. 3C have the strongest magnetic force, and the concentration of the magnetic material 15 becomes remarkable inside the coating film corresponding to the corners, so that the apparent pattern boundary is bent. It is understood that there is. In particular, when the angle of the corner, that is, the corner was an acute angle equal to or less than a right angle, the decrease was remarkable.

Therefore, as shown in FIG. 5A, the magnet 21 is displaced inward with respect to the ideal boundary line L so that the modified notch 31 for reducing the magnetic force is formed at the corner of the magnet 21. Formed. When pattern painting was performed using the magnet 21 having such a shape, a pattern corresponding to the ideal boundary line L was formed as shown in FIG. 5B.

The reason why the pattern is formed in a shape deviating from the ideal boundary line L is that, other than the case shown in FIG.
As shown in (C), a plurality of magnets 222a, 23a
Also occurred when they were placed close to each other. FIG.
When pattern painting was performed using the outer peripheral magnets 22a and 23a shown in FIG. 6C corresponding to the ideal boundary lines L1 and L2 shown in FIG. 6B, the pattern painting is shown in FIG. 6D. As described above, the bent portion M was generated in the coating film pattern due to the influence of the magnetic force between the two magnets. Therefore, as shown in FIG. 6 (A), the magnetic force for reducing the magnetic force is displaced inward of the magnet 22 with respect to the ideal boundary lines L1 and L2 at a portion where the magnetic forces of the two magnets 22 and 23 influence each other. When the modified notch 32 was formed and pattern painting was performed using the magnet 22, as shown in FIG. 6B, the ideal boundary line L1,
A pattern almost coincident with L2 was formed.

The present invention is not limited to the above embodiment,
A modified notch is formed in a magnetic concentration portion at a corner of one magnet, and when the magnetic forces of a plurality of magnets affect each other, a modified notch is formed so as to remove the affected portion. Needless to say, the present invention can be applied to magnets of various shapes for forming patterns of various shapes.

[0018]

As described above, according to the present invention, the modified notch for reducing the magnetic force is formed on the outer peripheral portion of the magnet.
A pattern having a shape corresponding to the ideal boundary line can be formed on the surface of the object to be coated, and a high-quality pattern coating film can be realized.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention;

FIG. 2 is a process diagram showing a method for forming a pattern coating film using the pattern coating film forming apparatus according to the present invention,

FIG. 3 is a cross-sectional view showing an object to be coated placed on a support base;

FIG. 4 is a cross-sectional view showing a state in which coating is being performed on an object to be coated;

FIGS. 5A to 5D are front views showing shapes and pattern boundaries of magnets of the present invention and a comparative example,

FIGS. 6A to 6D are front views showing shapes and pattern boundaries of magnets of the present invention and a comparative example.

[Explanation of symbols]

W: substrate, 11: support, 2
1, 22, 23: magnet, 31, 32: correction notch.

Claims (1)

(57) [Claims] A magnet is disposed on the back side of an object to be coated, and a coating material containing a powdery magnetic material is applied to the surface of an object made of a non-magnetic material, whereby the magnet is applied to the surface of the object to be coated. A pattern coating film forming apparatus for forming a pattern corresponding to an outer peripheral portion of the magnet, the outer peripheral portion of the magnet for reducing a magnetic force displaced with respect to an ideal pattern boundary formed on the surface of the object to be coated. An apparatus for forming a patterned coating film, wherein the modified notch portion is formed.