JPH04247263A - Device for forming patterned coating film - Google Patents

Abstract

PURPOSE:To fix the quality of the appearing pattern of a patterned coating film and to enhance productivity by accurately positioning a magnet. CONSTITUTION:This device for forming a patterned coating film is used when a paint contg. a powdery magnetic material is applied on the surface 1a of a material 1. The device has a main body 7 modeled after the shape of the rear 1b of the material 1 and a magnet 2 fixed to the main body 7 through an elastic body 8 energized toward the rear of the material and used for applying a magnetic force to the powdery magnetic material.

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 patterns on a paint film by orienting a powdered magnetic material contained in a paint film in various ways by the action of magnetic force.

0002

[Prior Art] Conventionally, as a method for forming patterns such as letters, marks, or designs on the surface of a coating film, an adhesive tape on which a predetermined pattern is printed is attached to the surface of the coating film, or
A method is known in which a masking paper with a predetermined pattern cut out is placed over the surface of the paint film, and then paint is applied over the masking paper. However, in all of these methods of forming patterns, steps are created on the surface of the paint film due to the adhesive tape or the paint film, which not only has an unfavorable appearance, but also requires a great deal of labor and time to apply the adhesive tape and masking paper. This also poses a problem in terms of cost. Further, dust and the like adhere to the stepped portions of the pattern, making cleaning work difficult, and there is also a risk that the adhesive tape or coating may peel off from the stepped portions.

In order to solve this problem, a method has been proposed in which a powdered magnetic material is mixed into the paint, and a magnet is used to orient the magnetic material, thereby forming a desired pattern in the paint film. has been done. Conventionally, this type of technology is
For example, there is one described in Japanese Patent Application Laid-Open No. 175,670/1983. This pattern coating film formation method involves forming a liquid coating film containing powdered magnetic material on the surface of the object to be coated, etc.
This is a method of forming a pattern by applying a magnet to a magnetic material in a desired area while the paint film is in a fluid state, and the method involves forming a pattern on the fluid paint film by applying a magnet to the magnetic material in the desired area. By applying magnetic force to the shape, a pattern is formed by making the orientation of the magnetic material in the part affected by the magnetic force different from that in other parts of the powdered magnetic material that is uniformly dispersed throughout the coating film. It is something to do.

0004

[Problems to be Solved by the Invention] When mass producing such patterned coating films, it is necessary to maintain the shape, color, etc. of the pattern formed on the surface of the object to be coated at a constant quality. In particular, it is necessary to accurately position the pattern relative to the object to be coated. However, the method of forming a magnet into a desired pattern and adhering it to an object to be coated each time has a problem in productivity. The present invention has been made in view of the problems of the prior art, and aims to maintain a constant quality of the pattern appearing on the patterned coating film and increase productivity by precisely positioning the magnet. With the goal.

[0005]

[Means for Solving the Problems] To achieve the above object, the present invention provides a patterned coating film used when applying a paint containing a powdered magnetic material to the surface of an object made of a non-magnetic material. The forming device includes a main body formed to correspond to the shape of the back surface of the object to be coated, and a forming device that is attached to the main body via an elastic body that urges the back surface of the object to be applied to the powdery magnetic material. This is a patterned coating film forming apparatus characterized by having a magnet that applies magnetic force.

[0006]

[Operation] First, a main body formed to correspond to the shape of the back surface of the object to be coated and an elastic body that biases the main body toward the back surface of the object to be coated are placed on the back surface of the object to be coated made of a non-magnetic material. After the apparatus for forming a patterned coating film according to the present invention having a magnet attached thereto is attached, a coating material containing a powdery magnetic material is applied to the surface of the object to be coated. As a result, even if there is a slight error in the shape of the pattern coating film forming device and the object to be coated, the magnet will stick to the back surface of the object due to the action of the elastic body, so the area where the pattern coating film is to be formed will be The positioning of the magnet can be performed with high precision, and the magnet can also be positioned easily. Immediately after the paint is applied, magnetic force acts on the powdered magnetic material in the paint, and the magnetic material is oriented along the lines of magnetic force. In this way, by positioning the magnets with high precision, it is possible to maintain a constant quality of the appearing pattern of the patterned coating film and to increase productivity.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 diagram showing a method for forming a patterned coating film using the patterned coating film forming apparatus according to the present invention, and FIG. 3 is A-A in FIG. 4 is a cross-sectional view taken along a line showing the object to be coated and the apparatus for forming a patterned coating film in the first step of the same forming method; FIG. 4 is an enlarged cross-sectional view of the magnet attachment part of FIG. 3; FIG. 5 is an enlarged sectional view of the magnet attachment part of FIG. 3, showing the state where it is attached to the object to be coated. FIG. 6 is a diagram showing the state before attachment. FIG. FIG. 7 is a cross-sectional view showing the object to be coated and the coating film, and FIG. 7 is a front view showing the magnet according to the present invention.

As shown in FIGS. 1 and 3, the molding jig 6, which is the apparatus for forming a patterned coating film according to this embodiment, is formed to correspond to the shape of the back surface 1b of the object 1 to be coated. Alternatively, the main body 7 is molded using plaster or the like. A magnet 2 formed in the shape of a desired pattern is embedded in the main body 7 with an elastic body 8 interposed therebetween. For example, "N
'' on the paint film, it is best to use a thin plate-shaped magnet 2 as shown in FIG. The elastic body 8 is made of urethane foam or the like, and includes the magnet 2, the elastic body 8, and the elastic body 8.
The mold jig main body 7 is fixed with an adhesive or the like, and when the mold jig 6 is attached to the back surface 1b of the workpiece 1, the magnet 2 is biased so as to come into close contact with the back surface 1b of the workpiece 1. . It is preferable that the magnet 2 is fixed so as to slightly protrude from the mold jig main body 7 as shown in FIG. Even if there is some error in (gap S shown in FIG. 5), the magnet 2 can be brought into close contact with the back surface 1b of the object 1 to be coated. Further, in order to follow the shape of the back surface 1b of the object 1 to be coated, it is preferable to use flexible magnetic rubber (a ferrite magnet based on nitrile rubber) as the magnet 2 of this embodiment.

Next, a specific example of forming a patterned coating film on the surface 1a of the object to be coated 1 using the patterned coating film forming apparatus 6 constructed as described above will be explained. First, the object to be coated according to this example is a base material for forming the patterned coating film of this example, and is made of a non-magnetic material. The specific material and shape are not particularly limited, and plastic, aluminum, etc. can be used. Examples of automobile parts include exterior parts such as bumpers, protection moldings, front grills, rear grills, wheel covers, and vent louvers, and interior parts such as instrument panels. These objects to be coated may be subjected to pretreatment, undercoating, and intermediate coating as necessary.

[0010] The paint according to this example consists of two coats of base paint and clear paint applied wet-on-wet.
It is a bake type paint. Base paint is a liquid paint in which a powdered magnetic material is mixed into a paint whose main components are a vehicle component and a solvent, and color pigments, dyes, aluminum powder, pearl pigments, mica, etc. are added as necessary. can do. As the vehicle component, ordinary paint resins can be used, such as resins that dry or reaction harden at room temperature,
Examples include resins that harden or melt when heated. Specifically, alkyd resins, polyester resins, acrylic resins, urethane resins, vinyl resins, amino resins, epoxy resins, phenol resins, and the like are preferred. Furthermore, examples of the solvent include organic solvents and water. Forms of paint include organic solvent type, non-aqueous dispersion type, aqueous solution type,
Examples include liquid forms such as emulsion types. The powdered magnetic material is a powder whose orientation changes due to magnetic force, and is preferably a powder of nickel, stainless steel with a high iron content, iron, or the like. The shape of the magnetic material may be scale-like, thin plate-like, granular, etc., and the size of the magnetic material is 1 to 50 μm in the longitudinal direction or diameter, preferably 20 μm.
~30 μm. The blending ratio of this powdered magnetic material is 1 part by weight (solid content) to 100 parts by weight of the vehicle component described above.
~30 parts by weight, especially 10-20 parts by weight are preferred.

The clear paint according to this embodiment is a liquid paint in which a powdered magnetic material is mixed into a paint whose main components are a vehicle component and a solvent, and a normal paint resin is used as the vehicle component. Examples include resins that dry or reaction harden at room temperature, and resins that harden or melt by heating. Specifically, alkyd resins, polyester resins, acrylic resins, urethane resins, vinyl resins, amino resins, epoxy resins, phenol resins, etc. are preferred, and it is more preferred to use the same resin as the vehicle component of the base paint described above. Furthermore, examples of the solvent include organic solvents and water. The paint may be in a liquid form such as an organic solvent type, a nonaqueous dispersion type, an aqueous solution type, or an emulsion type. Note that the paint used in the present invention is not limited to the above-mentioned two-coat, one-bake type paint, but may be a one-coat, one-bake type paint.

Next, the procedure for forming a patterned coating film and the operation of the patterned coating film forming apparatus will be explained. As shown in FIGS. 1 and 3, a mold jig 6 is first attached to the back surface 1b of the object 1 to be coated, which has been subjected to pretreatment, undercoating, intermediate coating, etc., as required. At this time, even if the shapes of the back surface 1b of the workpiece 1 and the mold jig 6 do not match with high accuracy, the magnet 2 alone is attached to the back surface 1b of the workpiece 1 by the action of the elastic body 8, as shown in FIG.
It comes into close contact with the magnetic field, and can achieve the magnetic effect described below. After attaching the mold jig 6 to the back surface 1b of the object 1 to be coated, a base paint 4 containing the powdered magnetic material 3 is applied to the surface 1a (i.e., the coated surface) of the object 1 to a dry film thickness of 15 to 35 μm. Apply it so that At this time, Figure 6
As shown in FIG. 2, the magnetic force emitted from the magnet 2 acts on the powdery magnetic material 3 in the base paint 4, and the powdery magnetic material 3 starts to align in the fluid base paint 4. After applying the base paint 4, a clear paint 5 is applied on the base paint 4 at a predetermined interval (preferably 3 to 5 minutes) so that the dry film thickness is 15 to 35 μm. Even while this clear paint 5 is being applied, magnetic force is acting on the powdery magnetic material 3 from the magnet 2, as shown in FIG.
The orientation of the powdered magnetic material 3 continues to progress. Note that the solvent contained in the base paint 4 has a lower boiling point than the solvent used in solid paints and clear paints due to constraints such as compatibility with the clear paint 5 applied wet-on-wet and equipment conditions such as painting booths. A quick-drying solvent is used. Therefore, the coating viscosity of the base paint 4 increases between the time when the base paint 4 is applied and the time when the clear paint 5 is applied, and as a result, the orientation of the powdered magnetic material 3 is temporarily suppressed. In this embodiment, since the magnet 2 is attached even while the clear paint 5 is being applied, the solvent contained in the clear paint 5 penetrates into the base paint 4 and temporarily damages the coating film of the base paint 4. The viscosity is reduced, thereby promoting the orientation of the powdered magnetic material 3 again. After applying clear paint 5, after a certain period of time (for example, 5 minutes)
Then, the mold jig 6 attached to the back surface 1b of the object 1 to be coated is removed, and in this state, the base paint 4 and the clear paint 5 are baked under predetermined drying conditions. In this way, the pattern coating film forming device 6 of this embodiment uses the elastic body 8 to
Since the magnet 2 that is in close contact with the magnet 2 is embedded, the magnet can be positioned with high precision, and the positioning work can also be performed extremely easily.

[0013] The orientation effect of the powdered magnetic material 3 occurs as follows. That is, as shown in FIG. 6, in areas where the magnetic force is not acting or where the magnetic force is relatively weak, the powdered magnetic material 3 is coated with the base paint in the same way as when painting is done without attaching the magnet 2. Arrange randomly within 4. On the other hand, in the area where the magnet 2 is attached and the magnetic force is acting, the powdery magnetic material 3 is oriented along the lines of magnetic force. In particular, since the end 2a of the magnet 2 has a strong magnetic force, the powdery magnetic material 3 is attracted near this end 2a, increasing the density of the powder. On the other hand, in the center part 2b of the magnet 2, the magnetic lines of force act almost perpendicularly to the coating film, so that the powdery magnetic material 3 stands upright. Therefore, when observing the patterned coating film formed, the powdery magnetic material 3 becomes denser along the edge 2a of the magnet 2, and the color of the magnetic material becomes stronger in this area. Moreover, since the magnetic material 3 stands upright in the central part 2b of the magnet 2, the reflected light becomes weak and the color becomes dark.

[0014]

Effects of the Invention As described above, according to the present invention, the main body is formed to correspond to the shape of the back surface of the object to be coated, and the elastic body biases the main body toward the back surface of the object to be coated. The structure has a magnet attached to it that applies magnetic force to the powdered magnetic material, so by accurately positioning the magnet, the pattern of the patterned coating film can be maintained at a constant quality, and productivity can be increased. can be increased.

[Brief explanation of the drawing]

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 patterned coating film using the patterned coating film forming apparatus according to the present invention.

FIG. 3 is a cross-sectional view taken along the line AA in FIG. 1, showing an object to be coated and an apparatus for forming a patterned coating film in the first step of the same forming method.

FIG. 4 is an enlarged sectional view of the magnet attachment portion of FIG. 3, showing a state before attachment to an object to be coated.

FIG. 5 is an enlarged sectional view of the magnet attachment portion of FIG. 3, showing a state where the magnet is attached to an object to be coated.

FIG. 6 is a sectional view showing the object to be coated and the coating film in the second and third steps of the same forming method.

FIG. 7 is a front view showing a magnet according to the present invention.

[Explanation of symbols]

1...Object to be coated,
1a...Surface of the object to be coated (applied surface), 1b...Back surface of the object to be coated, 2...
Magnet, 3... Powdered magnetic material,
4...Base paint, 5...Clear paint,
6... Mold jig (pattern coating film forming device), 7... Mold jig main body, 8
...Elastic body.

Claims (1)

[Claims] 1. An apparatus for forming a patterned coating film used when applying a paint containing a powdered magnetic material to the surface of an object made of a non-magnetic material, the device being adapted to the shape of the back surface of the object. and a magnet that is attached to the main body via an elastic body that biases it toward the back surface of the object to be coated and that applies magnetic force to the powdery magnetic material. Film forming device.