JP5244882B2 - Magnetic body coating apparatus and magnetic body coating method - Google Patents

Description

The present invention is, for example, magnetic coating apparatus to express the desired pattern on the surface of the resin coated article to form a coating film, and relates to a magnetic coating how.

  Conventionally, by placing a sheet magnet (plate magnet) on the back side of the painted surface of the product to be coated and applying a paint containing magnetic flakes on the painted surface, the magnetic flakes in the paint are oriented and magnetized. There is known a coating method for expressing a pattern corresponding to the shape of the film (for example, see Patent Document 1). In this type, a single-sided magnetic pole magnet is disposed on the back surface of the article to be coated, and a predetermined magnetic field is formed on the surface of the article to be coated. It is applied by a coating machine, the paint is cured, and a pattern is developed at the position corresponding to the magnet end surface corresponding to the outline of the magnet.

JP 2009-154034 A

  However, in the conventional configuration using a single-sided double-sided magnet, when the magnetic flux density at the position corresponding to the magnet end surface is set high, the phase is 90 ° on both sides of the position (see the comparative examples in FIGS. 5 and 6). ) Is formed widely. And since the magnetic flux density at that part is also relatively high, the magnetic flakes stand up and harden in a wide range during painting, for example, the phenomenon that the magnetic flakes pop out of the coating surface and the surface of the coated product appears rough ( In the following, there is a problem that a wide range of glossiness occurs. In addition, when the magnetic force of the magnet is weakened so that glossiness does not occur, the magnetic flux density at the position corresponding to the end surface of the magnet becomes low, so that the magnetic flakes cannot be sufficiently oriented and the pattern becomes unclear. .

The present invention has been made in view of the above-described circumstances, and is a magnetic material coating apparatus capable of improving the texture of a coated product surface by preventing glossiness while clarifying a pattern corresponding to the shape of a magnet. , and aims to provide a magnetic coating how.

In order to achieve the above object, the present invention provides a plate-like magnet (3) that forms a magnetic field (13) on the surface (1A) of a thin plate-like article (1). The paint (15) containing fine magnetic flakes (17) is applied to the surface (1) of the article to be coated (1A) to correspond to the contour shape of the magnet (3). In the magnetic material coating apparatus for forming a coating film that expresses the pattern, a plate-shaped magnet along the back surface (1B) of the article to be coated (1), with N and S poles or S on the front and back surfaces thereof. A second magnet along which the contours of the first magnet (5) having the pole and the N pole are aligned with the back surface (5B) of the first magnet (5) so that the N pole and the S pole are reversed. And a magnet (7).
In the present invention, a plate-shaped magnet along the back surface of the article to be coated, the first magnet having N and S poles, or S and N poles on the front and back, and the back surface of the first magnet, Since the second magnet is provided so that the N pole and the S pole are reversed so that the contours thereof are aligned, the magnetic flux density is high in the vicinity of the position corresponding to the magnet contour on the surface of the coated product with a simple configuration. Has a region in which the direction is substantially parallel to the surface of the article to be coated, and a magnetic field is formed in which the magnetic flux density is high and the region in which the direction of the magnetic field is substantially perpendicular to the surface of the article to be coated is narrow.
Therefore, with a simple configuration, it is possible to reliably form a high light reflectance region in which the magnetic flakes are oriented substantially parallel to the surface of the article to be coated in the vicinity of the position corresponding to the magnet contour on the surface of the article to be coated. The pattern corresponding to the outline of the magnet is clear. Further, the region where the magnetic flakes are oriented substantially perpendicularly to the surface of the article to be coated can be narrowed, and the texture of the surface of the article to be coated can be improved without making the blurring noticeable.

The first magnet (5) and the second magnet (7) may be arranged at a certain distance from each other.
In this case, since the magnetic flux density in the region corresponding to the magnet end can be adjusted, the balance between the clarity of the pattern and the degree of glossiness can be easily adjusted.
A plate material (206) made of a magnetic material may be sandwiched between the gaps of the predetermined distance.
In this case, the magnetic field is curved toward the center of the magnet by the magnetic body, and the position where the direction of the magnetic field on the surface of the article to be coated is substantially parallel to the surface of the article to be coated is offset inward from the magnet contour corresponding position. Since the position where the magnetic flakes are oriented in parallel is offset inward from the position corresponding to the magnet contour, the size of the pattern can be easily reduced.

Moreover, this invention arrange | positions the plate-shaped magnet (3) which forms a magnetic field in the surface (1A) of a thin plate-shaped article (1) on the back surface (1B) of the article to be coated (1). A paint film (15) containing fine magnetic flakes (17) is applied to the surface (1A) of the article (1) to be coated, and a pattern corresponding to the contour shape of the magnet (3) is developed. In the magnetic material coating method to be formed, the magnetic flux density peaks at the magnet end face corresponding position (19A, 19B) of the article to be coated (1) corresponding to the contour of the magnet (3), and the magnet end face corresponding position (19A). , approaches zero with distance to the opposite sides of the inner and outer direction of the magnet (3) of 19B), the direction of the magnetic field, the surface (1A of the magnet end face corresponding positions (19A, 19B) in the painted (1) along parallel to), as separated on both sides of the position (19A, 19B) Successively tilted vertically, and the said magnet end faces corresponding positions to the side to be parallel to the surface (1A) further away on either side of a pair of vertical portions in a direction perpendicular surface (1A) of the coated product (1) ( 19A, 19B) in the formation process of the magnetic field (13) inclined to the opposite side, the application process of the paint (15) to the surface (1A) of the article to be coated (1), and the applied paint (15) An orientation process of orienting the magnetic flakes (17) contained along the magnetic field (13) may be provided.
In the present invention, the magnetic flux density is high at the position corresponding to the magnet end face, and the direction of the magnetic field is substantially parallel to the surface of the article to be coated. As a result, the region has a high light reflectance, and a pattern corresponding to the contour of the magnet is clearly formed.
In addition, the magnetic field changes suddenly on both sides of the position (19A, 19B), and a magnetic field perpendicular to the surface (1A) of the article to be coated (1) is formed with a narrow width. The region that is substantially perpendicular to the surface of the film is narrowed, the region in which the magnetic flakes are oriented substantially perpendicularly becomes narrow, and the texture of the coated product surface can be improved without making the blurring noticeable.

In addition, the article to be coated (1) on which the coating film is formed by the magnetic coating apparatus changes the reflection direction of the light according to the posture of the magnetic flakes (17) after the paint is cured, and appears to be convex. A coating film expressing a target pattern is formed , and the part of the three-dimensional pattern is brighter than the surroundings and appears to be raised, and the posture of the magnetic flakes (17) is on the painted surface. The bright part (23) arranged substantially parallel to the part and a part of the three-dimensional pattern that is darker than the surroundings and appears to be recessed, and the posture of the magnetic flakes (17) is relative to the painted surface. A dark portion (25) arranged in a standing state and a hue between the bright portion (23) and the dark portion (25) of the three-dimensional pattern, and the posture of the magnetic flakes (17) is on the painted surface An intermediate portion (29) arranged randomly, Is the arrangement dark portion (25) on both sides of the section (23), said intermediate portion on the outer side of the dark portion (25) (29) and being arranged.
In the present invention, since the bright part, the dark part, and the intermediate part are provided, it is easy to give contrast and the pattern can be made clearer. In addition, a dark part that appears dark is arranged on both sides of a bright part that appears bright, and an intermediate part that appears to be intermediate brightness is arranged outside the dark part, so that the pattern looks three-dimensional due to the difference in brightness.

The bright portion (23) is a part of an arch-shaped portion (27) in which the posture of the magnetic flakes (17) is formed in a convex arch shape with respect to the painted surface, and the dark portion (25) It may be arranged on both sides of the arched portion (27).
Since the arch-like part looks like a mountain and the dark part looks like a shadow of the mountain, the stereoscopic effect of the three-dimensional pattern corresponding to the contour shape of the magnet can be increased.

  According to the present invention, the texture corresponding to the shape of the magnet can be clarified, and the texture of the surface of the coated product can be improved by preventing glossiness.

It is a figure which shows the magnetic body coating apparatus which concerns on 1st Embodiment of this invention. (A) is an enlarged view of a portion I in FIG. 1, (B) is a diagram showing the magnetic flux density at each position on the surface of the article to be coated, and (C) is a diagram showing the direction of the magnetic field. (A) is a figure which shows the magnetic body coating apparatus which concerns on 2nd Embodiment of this invention, (B) is a figure which shows the magnetic flux density in each position of the to-be-coated article surface, (C) is a figure which shows the direction of the magnetic field It is. (A) is a figure which shows the magnetic body coating apparatus based on 3rd Embodiment of this invention, (B) is a figure which shows the magnetic flux density in each position of the to-be-coated article surface, (C) is a figure which shows the direction of the magnetic field It is. It is a figure which shows the magnetic body coating apparatus as a comparative example. (A) is an enlarged view of a portion II in FIG. 5, (B) is a diagram showing magnetic flux density at each position on the surface of the article to be coated, and (C) is a diagram showing the direction of the magnetic field.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<First Embodiment>
FIG. 1 is a diagram showing a magnetic material coating apparatus according to the present embodiment.
In the magnetic material coating apparatus, a coating film is formed on the surface 1A of the article to be coated 1 by applying the coating material 15 using a coating machine (not shown).
The article 1 to be coated is a plate-like nonmagnetic material. The article 1 to be coated is a vehicle cover part made of a resin plate having a thickness of 2 to 3 mm, for example. In the present embodiment, the surface 1A of the article to be coated 1 has a material color different from the paint color of the finished product, but a paint (not shown) of the paint color of the finished product may be applied to the surface 1A. And the coating color may be expressed by the pigment mix | blended with a molding material. The article to be coated 1 may be formed of rubber or FRP in addition to a resin molded article.
On the back surface 1B side of the article 1 to be coated, a plate-like magnet 3 is disposed along the back surface 1B. In this embodiment, the magnet 3 is fixed to the back surface 1B of the article 1 to be coated by attaching the magnet 3 to the back surface 1B of the article 1 to be coated with an adhesive tape (not shown).
The magnet 3 includes a first magnet 5 and a second magnet 7. The shape and magnetic force of the first magnet 5 are substantially the same as those of the second magnet 7. Both the first magnet 5 and the second magnet 7 are plate-shaped magnets whose front and back surfaces are magnetic poles and whose magnetic poles are not reversed in the plane. In the present embodiment, both the first magnet 5 and the second magnet 7 are formed from a magnet sheet having a width of 100 mm and a plate thickness of 1 mm. This magnet sheet is a known magnet sheet obtained by kneading a large number of fine magnetic particles in a molding material such as rubber to form a sheet and magnetizing the magnetic particles.

The 1st magnet 5 is arrange | positioned along the back surface 1B of the to-be-coated article 1, and the 2nd magnet 7 is arrange | positioned so that an outline may substantially correspond to the back surface 5B side of the 1st magnet 5. FIG. That is, one end face of the first magnet 5 forms one end face 3C of the magnet 3 together with one end face of the second magnet 7, and the other end face of the first magnet 5 and the other end face 3D of the magnet 3 together with the other end face of the second magnet 7. Form.
The second magnet 7 is arranged so that the N pole and the S pole are reversed with respect to the first magnet 5. In this embodiment, the 1st magnet 5 is arrange | positioned so that the surface 5A may become N pole and the back surface 5B may become S pole. The second magnet 7 is arranged so that the front surface 7A is an S pole and the back surface 7B is an N pole. And the back surface 5B of the 1st magnet 5 which is an S pole, and the surface 7A of the 2nd magnet 7 are adhere | attached.
Due to the arrangement of the first magnet 5 and the second magnet 7 described above, the magnetic field of the first magnet 5 is influenced by the magnet 3 and is bent to the front side. That is, a magnetic field 13 is formed that is bilaterally symmetric with respect to the magnet central surface 9 at the center in the width direction of the magnet 3 and that is vertically symmetric with respect to the back surface 5B of the first magnet 5 (the surface 7A of the second magnet 7). The direction of the magnetic field 13 and the magnetic flux density on the surface 1A of the article 1 to be coated vary depending on the positions intersecting with the extended surfaces of the end surfaces 3C and 3D of the magnet 3, that is, the distances from the magnet end surface corresponding positions 19A and 19B.

  A paint 15 is applied to the surface 1A of the article 1 to be coated. The paint 15 is a translucent or transparent liquid paint including magnetic flakes 17 (see FIG. 2A). The coating film thickness of the paint 15 is thin, for example, 100 μm or less in terms of dry film thickness. The magnetic flakes 17 are fine powder in the form of flakes or thin plates that are oriented (change in direction) by magnetic force when mixed in a liquid and subjected to a magnetic field. In the present embodiment, the magnetic flakes 17 are made of iron powder. For example, nickel, iron, stainless steel, cobalt, chromium, iron oxide powder, or these metals or metal oxides are coated or coated. It may be contained.

After the coating material 15 is applied to the surface 1A of the article 1 to be coated, when the coating material 15 is in an uncured liquid state, the magnetic flakes 17 in the coating material 15 are oriented along the magnetic field 13. In particular, at the position corresponding to the contour of the magnet 3, that is, the magnet end face corresponding positions 19A and 19B, a magnetic flux density peak occurs, and the direction of the magnetic field at the position is parallel to the surface 1A of the article 1 to be coated. The magnetic flakes 17 are oriented parallel to the surface 1A of the article 1 to be coated.
And the coating material 15 which has the area | region where the reflectance of light is high in the vicinity of the magnet end surface corresponding | compatible positions 19A and 19B is formed by hardening the coating material 15 in the state by which the magnetic body flakes 17 were orientated. That is, a coating film having a pattern corresponding to the contour shape of the magnet 3 is formed on the surface 1A of the article 1 to be coated.

Next, the magnetic field 13 on the surface 1A of the article 1 to be coated and the orientation of the magnetic flakes 17 in the paint 15 applied to the surface 1A will be described in detail.
FIG. 2A is an enlarged view showing a portion I in FIG. FIG. 2A is a diagram showing a range of about 50 mm on both sides of the magnet end face corresponding position 19A, and the film thickness of the coating film is exaggerated for the sake of simplicity.
FIG. 2B is a diagram showing the relationship between the distance from the magnet end face corresponding position 19A on the surface 1A of the article 1 to be coated 1 and the magnetic flux density (characteristic curve indicated by reference numeral 13B in the figure). In the present embodiment, a negative sign is assigned to the distance from the magnet end surface corresponding position 19A on the magnet inner surface corresponding position 21 side corresponding to the magnet center surface 9 relative to the magnet end surface corresponding position 19A. On the outside of the magnet from the corresponding position 19A (on the side opposite to the magnet center surface corresponding position 21), a positive sign is assigned to the distance from the magnet end surface corresponding position 19A.
FIG. 2C is a diagram showing the relationship between the distance from the magnet end face corresponding position 19A and the direction (phase) of the magnetic field (characteristic curve indicated by reference numeral 13C in the figure). The phase is an index representing the direction of the magnetic field as an angle with respect to the surface 1A of the article 1 to be coated. In the present embodiment, the phase of the magnetic field vector in a direction away from the magnet center plane corresponding position 21 is set to 0 degree, a positive sign is attached to the angle that opens from the surface 1A of the article 1 to be coated to the front side, and the surface of the article 1 to be coated A negative sign is attached to the angle opened from 1A to the back side.

The present inventors have confirmed that when the coating apparatus shown in FIG. 1 is used, a magnetic field 13 described below is formed on the surface 1A of the article 1 to be coated.
As shown in FIG. 2 (C), on the inner side of the magnet end surface corresponding position 19A (magnet center surface corresponding position 21 side), the phase increases rapidly from 0 degree to about 130 degrees between about -10 mm position. From the position of about −10 mm, the phase gradually increases and reaches a peak value of 160 degrees at the position of about −35 mm. Although the phase reaches 90 degrees at a position of about −4 mm, since it continues to increase rapidly even if it exceeds 90 degrees, the region where the phase is close to 90 degrees is narrow. Then, after the position of about −35 mm, the phase starts to decrease, and the phase becomes 90 degrees again at the magnet center plane corresponding position 21 (−50 mm position). Further, as shown in FIG. 2B, the magnetic flux density has a peak value of 1.8 mT at the magnet end face corresponding position 19A, and decreases with increasing distance from the magnet end face corresponding position 19A, and about 0 at the position of about −4 mm. .8 mT, or 0.3 mT at a position of about -10 mm. The magnetic flux density is almost zero at the magnet center plane corresponding position 21 (−50 mm position).

  On the other hand, outside the magnet end surface corresponding position 19A (on the opposite side to the magnet center surface corresponding position 21), as shown in FIG. 2 (C), the phase is from 0 degree to about −130 degrees between about 10 mm positions. It decreases rapidly, and the phase decreases gradually from the position of about 10 mm, reaches -150 degrees at the position of about 20 mm, and changes from -150 to -160 degrees to the position of 50 mm. Although the phase reaches −90 degrees at a position of about 4 mm, since the sharp decrease continues even when the phase is below −90 degrees, the region where the phase is close to −90 degrees is narrow. Further, as shown in FIG. 2B, the magnetic flux density shows a peak value of 1.8 mT at the magnet end face corresponding position 19A, and decreases as it moves away from the magnet end face corresponding position 19A. The magnetic flux density is about 0.8 mT at a position of about 5 mm and about 0.3 mT at a position of about 10 mm. The magnetic flux density is almost zero at the 50 mm position.

  When the coating material 15 including the magnetic flakes 17 is applied to the surface 1A of the article 1 to be coated on which the magnetic field 13 having the above-described characteristics is formed, the magnetic flakes 17 are applied to the magnetic field 13 as shown in FIG. Oriented along. Specifically, the magnetic flakes 17 are oriented parallel to the surface 1A of the article to be coated 1 at the magnet end face corresponding position 19A. As it moves away from the magnet end surface corresponding position 19A on both sides, the posture of the magnetic flakes 17 gradually approaches the direction perpendicular to the surface 1A of the article 1 to be coated, and at the position about 4 mm away from both sides, it approaches the surface 1A of the article 1 to be coated. Oriented vertically. Then, at positions separated by about 4 mm or more on both sides, the force acting on the magnetic flakes 17 by the magnetic field 13 moves away from the magnet end face corresponding position 19A (inward from the magnet end face corresponding position 19A, the magnet center face corresponding position 21). The magnetic flakes 17 are less likely to be oriented due to the resistance force from the liquid paint 15. Accordingly, an orientation attenuation region Ra in which the orientation of the magnetic flakes 17 gradually weakens as it moves away from the magnet end surface corresponding position 19A, and a position further away from the magnet end surface corresponding position 19A than the orientation attenuation region Ra (for example, the magnet center) In the vicinity of the surface corresponding position 21), a random orientation region Rb in which the magnetic flakes 17 are oriented almost randomly is generated.

  When the paint 15 is dried and cured while the magnetic field 13 is maintained, a coating film having a pattern corresponding to the contour shape of the magnet 3 is formed on the surface 1A of the article 1 to be coated. That is, in the vicinity of the position 19A corresponding to the magnet end face, the magnetic flakes 17 are oriented in a direction parallel to the surface 1A of the article 1 to be coated, so that the reflectance of light in the direction orthogonal to the surface 1A of the article 1 is high. Accordingly, the vicinity of the magnet end face corresponding position 19A is a bright portion 23 that looks bright.

In the vicinity of a position about 4 mm away on both sides of the magnet end face corresponding position 19A, the magnetic flakes 17 are oriented in a direction perpendicular to the surface 1A of the article 1 to be coated, and therefore light in a direction perpendicular to the surface 1A of the article 1 to be coated is obtained. The reflectivity is low. That is, the dark portion 25 that appears dark is near the position about 4 mm away on both sides of the magnet end surface corresponding position 19A. In this region, since the magnetic flakes 17 are oriented in the direction perpendicular to the surface 1A of the article 1 to be coated, glossiness tends to occur. However, since the width of the glossy region is narrow, the glossiness does not stand out and the texture of the painted surface does not deteriorate.
In the region between the two dark portions 25 described above, the posture of the magnetic flakes 17 is sequentially changed, and an arch-shaped portion 27 is formed which is parallel to the surface 1A of the article 1 to be coated and becomes a vertical direction again. The The arched portion 27 appears to rise in an arch shape because the light reflectance and reflection direction change sequentially. Further, the arched portion 27 includes a bright portion 23.
Further, in a region away from the magnet end surface corresponding position 19A by about 4 mm or more, the orientation of the magnetic flakes 17 gradually weakens as the distance from the magnet end surface corresponding position 19A increases to both sides, and further away from the magnet end surface corresponding position 19A (for example, a magnet In the vicinity of the center plane corresponding position 21), the magnetic flakes 17 are oriented almost randomly, so that the light reflectance is an intermediate value between the reflectance in the bright portion 23 and the reflectance in the dark portion 25. An intermediate portion 29 that appears to be light in the middle of the dark portion 25 is formed. That is, the vicinity of the magnet end surface corresponding position 19 </ b> A becomes a bright portion 23, and dark portions 25 are formed on both sides of the bright portion 23. A region sandwiched between the two dark portions 25 forms an arch-shaped portion 27 that appears to rise in an arch shape, and an intermediate portion 29 having intermediate brightness is formed outside the dark portion 25. Further, in the intermediate portion 29, as it moves away from the magnet end face corresponding position 19A to both sides (closer to the magnet center face corresponding position 21 inside the magnet end face corresponding position 19A), an orientation decay region Ra and a random orientation region Rb are generated, and the magnetic body Since the orientation direction of the flakes 17 gradually changes, the pattern corresponding to the contour shape of the magnet 3 moves away from both sides of the magnet end surface corresponding position 19A (closer to the magnet center surface corresponding position 21 inside the magnet end surface corresponding position 19A). As a result, it becomes like a gradation pattern in which the brightness (brightness) changes, and it is easy to give a three-dimensional effect.

FIG. 5 shows a coating apparatus as a comparative example.
FIG. 6A is an enlarged view of the II part in FIG. FIG. 6B is a diagram showing a relationship between the distance from the magnet end face corresponding position 319A on the surface 301A of the article 301 to be coated and the magnetic flux density (characteristic curve indicated by reference numeral 313B in the figure). FIG. 6C is a diagram showing the relationship (characteristic curve indicated by reference numeral 313C in the figure) between the distance from the magnet end face corresponding position 319A and the direction (phase) of the magnetic field. 5 and 6, the same reference numerals are given to the portions described in the first embodiment, and the description thereof is omitted.
In this comparative example, a single double-sided magnetic pole magnet 303 is disposed on the back surface of the article to be coated 301, and a predetermined magnetic field 313 is formed on the surface 301A of the article to be coated 301. The coating material 15 (FIG. 6) is applied by a coating machine (not shown), the coating material 15 is cured, and a pattern is developed at the magnet end surface corresponding positions 319A and 319B corresponding to the contour of the magnet 303. Here, as shown in FIG. 6 (B), when the magnetic flux density at the magnet end face corresponding position 319A is set to 9 mT, the magnetic flux density gently decreases on both sides with the magnet end face corresponding position 319A at the apex, 0.8 mT. The above magnetic flux density region is wide.
And in this wide area | region of 0.8 mT or more, as shown in FIG.6 (C), area | region 330A, 330B from which a phase (direction of the magnetic field with respect to the surface 301A) is about 90 degree | times or about -90 degree | times is wide. Formed. In these regions 330A and 330B, as shown in FIG. 6A, the magnetic flakes 17 are oriented orthogonally to the surface 301A of the article 301 to be coated. A phenomenon (hereinafter referred to as “shiny-bake”) occurs in which the surface of the painted product appears to be rough due to jumping out.
On the other hand, when the magnetic force of the magnet 303 is weakened so as not to cause glossiness, the magnetic flux density at the position 319A (319B) is low as indicated by a broken line with reference numeral 313D in FIG. 6B. Therefore, the magnetic flakes 17 cannot be sufficiently oriented, and the pattern becomes unclear.

In the present embodiment, the plate-like magnet 3 for forming the magnetic field 13 on the surface 1A of the article 1 to be coated has substantially the same shape and magnetic force, and the plate-like first magnet 5 having magnetic poles on the front and back surfaces. And a second magnet 7. The 1st magnet 5 is arrange | positioned along the back surface 1B of the to-be-coated article 1, and the 2nd magnet 7 is the back surface 5B side of the 1st magnet 5 so that a 1st magnet 5 and an outline may correspond substantially, and The first magnet 5 and the first magnet 5 are bonded to each other so that the direction of the magnetic poles is opposite to that of the first magnet 5.
For this reason, the magnetic field 13 is formed on the surface 1A of the article 1 to be coated with a simple configuration in which two plate magnets are simply stacked. In the magnetic field 13, the magnetic flux density is as high as 1.8 mT at the magnet end face corresponding position 19A, and the direction of the magnetic field is substantially parallel to the surface 1A of the article 1 to be coated. The magnetic flux density gradually decreases from the direction parallel to the surface 1A of the product 1 to the perpendicular direction, and the magnetic flux density is 0.8 mT and the magnetic field direction is about 4 mm away from the magnet end face corresponding position 19A. In a direction substantially perpendicular to the surface 1A of the article 1 to be coated, the magnetic flux density is as low as less than 0.8 mT at a position separated by about 4 mm or more.

  In the present embodiment, the magnet end face corresponding position 19A has a high magnetic flux density of 1.8 mT, and the magnetic field direction is substantially parallel to the surface 1A of the article 1 to be coated. Therefore, in the vicinity of the magnet end face corresponding position 19A, The magnetic flakes 17 are surely oriented parallel to the surface 1A of the article 1 to be coated. Therefore, the bright portion 23 having a high light reflectance can be reliably formed in the vicinity of the magnet end surface corresponding position 19A, and a pattern corresponding to the contour of the magnet 3 can be clearly formed.

Moreover, in this embodiment, a phase changes rapidly as it leaves | separates from 19 A of magnet end surface corresponding positions. It reaches 90 degrees at the position of about -4 mm inside the magnet end face corresponding position 19A, but continues to increase rapidly beyond 90 degrees, and reaches -90 degrees at the position of about 4 mm outside the magnet end face corresponding position 19A. However, since the sharp decrease continues even when the angle is less than −90 degrees, the region where the phase of the magnetic field is close to 90 degrees or −90 degrees on the surface 1A of the article 1 to be coated becomes narrow.
Therefore, the region where the magnetic flakes 17 are oriented substantially perpendicular to the surface 1A of the article 1 to be coated is narrowed. Therefore, when compared with the comparative example of FIG. 5 and FIG. 6, it is possible to narrow the dark portion 25 that has low light reflectance and easily causes glossiness, and the texture of the surface of the coated product is made less noticeable. Can be improved.

Further, in the present embodiment, within a range of about 4 mm on both sides from the magnet end surface corresponding position 19A, the direction of the magnetic field changes from a direction parallel to the surface 1A of the article 1 to be coated as it moves away from the magnet end surface corresponding position 19A. While changing sequentially, the magnetic flux density is kept at least about 0.8 mT or more. For this reason, the arch of the magnetic flakes 17 is sequentially changed within a range of about 4 mm on both sides from the position 19A corresponding to the magnet end surface so as to change from the vertical direction to the parallel direction with respect to the surface 1A of the article 1 to be coated. A shaped part 27 is formed. The arched portion 27 looks like a raised mountain because the reflectance of light sequentially changes, and the dark portion 25 looks like a shadow of that mountain. In other words, a pattern that appears to rise like a mountain corresponding to the contour of the magnet 3 can be made a more three-dimensional pattern.
Further, in the present embodiment, the vicinity of the magnet end face corresponding position 19 </ b> A becomes a bright portion 23 that appears bright, dark portions 25 are formed on both sides of the bright portion 23, and an intermediate portion 29 having intermediate brightness is formed outside the dark portion 25. As a result, the contrast (lightness difference) increases, and the pattern corresponding to the contour of the magnet 3 looks more three-dimensional.

Second Embodiment
Next, as a second embodiment of the present invention, a magnetic material coating apparatus arranged with a gap between the first magnet and the second magnet will be described.
FIG. 3A is a diagram showing a magnetic material coating apparatus according to this embodiment. FIG. 3B is a diagram showing the relationship between the distance from the magnet end face corresponding position 119A on the surface 101A of the article 101 to be coated and the magnetic flux density (characteristic curve indicated by reference numeral 113B in the figure). FIG. 3C is a diagram showing the relationship (characteristic curve indicated by reference numeral 113C in the figure) between the distance from the magnet end face corresponding position 119A and the direction (phase) of the magnetic field. 3A to 3C, the same reference numerals are given to the portions described in the first embodiment, and the description thereof is omitted.

As shown in FIG. 3A, in this embodiment, the configuration of the magnet 103 arranged along the back surface 101B of the article to be coated 101 is different from the configuration of the magnet 3 of the first embodiment. That is, in the first embodiment, the first magnet 5 and the second magnet 7 are bonded, and no gap is provided between the magnets. In contrast, in the present embodiment, the first magnet 5 and the second magnet 7 are arranged in parallel with each other without being bonded, and the interval T between the magnets can be adjusted. In the present embodiment, the first magnet 5 and the second magnet 7 are held in parallel with each other without using a magnet holder (not shown).
For example, when the interval T between the magnets is 1 mm, the phase remains substantially the same as the magnetic field 13 in the first embodiment as shown by a solid line in FIG. 3C, and the solid line in FIG. As shown, the peak value of the magnetic flux density is about twice that of 3.5 mT.
When the interval T between the magnets is increased, the influence of the second magnet 7 is reduced, and the magnetic field 113 on the surface 101A of the article 101 to be coated approaches the magnetic field 313 in the conventional coating method as shown by the broken line in FIG. . That is, the peak value and the minimum value of the magnetic flux density are increased, and the region where the phase is 90 degrees or -90 degrees is widened.
On the other hand, when the interval T between the magnets is narrowed, the magnetic field 113 on the surface 101A of the article 101 to be coated approaches the magnetic field 13 in the first embodiment described above, as indicated by a chain line in FIG. That is, the peak value of the magnetic flux density is lowered, and the region where the phase is 90 degrees or -90 degrees is narrowed.
Therefore, it is possible to easily adjust the balance between the clarity of the pattern and the degree of gloss. Further, since the peak value of the magnetic flux density can be easily adjusted without changing the first magnet 5 and the second magnet 7, even if the thickness of the article 101 is thick, the magnet end face corresponding position 119 A magnetic flux density sufficient to cause the orientation of the magnetic flakes 17 can be obtained, and a clear pattern can be formed.

<Third Embodiment>
Next, as a third embodiment of the present invention, a magnetic material coating apparatus in which a plate material made of a magnetic material is sandwiched between a first magnet 5 and a second magnet 7 will be described.
FIG. 4A is a diagram showing a magnetic material coating apparatus according to this embodiment. FIG. 4B is a diagram showing the relationship between the distance from the magnet end face corresponding position 219A on the surface 201A of the article 201 to be coated and the magnetic flux density (characteristic curve indicated by reference numeral 213B in the figure). FIG. 4C is a diagram showing the relationship (characteristic curve indicated by reference numeral 213C in the figure) between the distance from the magnet end face corresponding position 219A and the direction (phase) of the magnetic field. 4A to 4C, the same reference numerals are given to the portions described in the first embodiment, and the description thereof is omitted.

As shown in FIG. 4A, in this embodiment, the configuration of the magnet 203 arranged along the back surface 201B of the article 201 to be coated is different from the configuration of the magnet 3 in the first embodiment. That is, in the first embodiment, the first magnet 5 and the second magnet 7 are directly bonded. On the other hand, in the present embodiment, a magnetic iron plate 206 having substantially the same contour as each magnet is sandwiched between the first magnet 5 and the second magnet 7, and the first magnet 5, the magnetic iron plate 206, and the second magnet It was set as the structure which aligned the outline of the magnet 7, and was mutually adhere | attached and integrated.
Since the magnetic field is curved due to the influence of the magnetic iron plate 206, the position X where the phase becomes 0 moves from the magnet end surface corresponding position 219A toward the magnet center surface corresponding position 221 as shown in FIG. For example, when the magnetic iron plate 206 having a thickness of 1 mm is sandwiched, the position X where the phase becomes 0 moves about 2 mm toward the magnet center plane corresponding position 221 side. Thereby, the position where a pattern is expressed can be offset. For example, when it is desired to form a pattern having the same shape and different size, the size of the pattern can be adjusted without changing the sizes of the first magnet 5 and the second magnet 7.
The above-described embodiment is merely an aspect of the present invention, and can be arbitrarily modified and applied without departing from the spirit of the present invention.

In each of the above-described embodiments, the configuration in which the thickness of the first magnet 5 and the thickness of the second magnet 7 are the same is shown. However, even if the thickness of the second magnet 7 is larger than the thickness of the first magnet 5. The thickness of the second magnet 7 may be made thinner than the thickness of the first magnet 5.
In each of the above-described embodiments, the magnet 3 in which the second magnet 7 that is also a magnet sheet magnetized on both sides is arranged on the first magnet 5 that is a magnet sheet magnetized on both sides so that the contours thereof substantially coincide with each other. , 103, 203 are shown along the back surface 1B of the article 1 to be coated. However, the first magnet 5 and the second magnet 7 are not limited to magnet sheets, and various known magnets are used. It is possible. Moreover, in each embodiment mentioned above, although the structure arrange | positioned so that the south pole of the 1st magnet 5 and the south pole of the 2nd magnet 7 face each other, the north pole of the 1st magnet 5 and the 2nd magnet 7 of the 2nd magnet 7 were shown. You may arrange | position so that N pole may face.
Moreover, in each embodiment mentioned above, although the 1st magnet 5 was affixed on the back surface 1B, 101B, 201B of to-be-coated goods 1,101,201 with the adhesive tape (not shown), the magnet 3, 103 and 203 may be fixed. Further, in each of the above-described embodiments, the coating material 15 is applied after the magnetic fields 13, 113, and 213 are formed. However, after the coating material 15 is applied, the magnetic fields 13, 113, and 213 are applied before the coating material 15 is cured. Also good.

1, 101, 201, 301 Products to be coated 1A, 101A, 201A, 301A Front surface 1B, 101B, 201B, 301B Back surface 3, 103, 203, 303 Magnet 5 First magnet 5B Back surface 7 Second magnet 13, 113, 213, 313 Magnetic field 15 Paint 17 Magnetic flakes 19A, 19B, 119A, 119B, 219A, 219B Magnet end face corresponding position 23 Bright portion 25 Dark portion 27 Arched portion 29 Intermediate portion 206 Magnetic iron plate T Interval

Claims (6)

A plate-like magnet (3) for forming a magnetic field (13) on the surface (1A) of the thin plate-like article (1) is disposed on the back surface (1B) of the article (1) to be coated. Magnetic material that forms a coating film in which a coating (15) containing fine magnetic flakes (17) is applied to the surface (1A) of the coated product (1) to develop a pattern corresponding to the contour shape of the magnet (3). In body coating equipment,
A plate-shaped magnet along the back surface (1B) of the article to be coated (1), the first magnet (5) having N and S poles or S and N poles on the front and back;
A second magnet (7) along which the contours are aligned so that the N pole and the S pole are reversed with respect to the back surface (5B) of the first magnet (5),
Magnetic material coating apparatus characterized by that.   The magnetic material coating apparatus according to claim 1, wherein the first magnet (5) and the second magnet (7) are arranged at a certain distance from each other.   The magnetic material coating apparatus according to claim 2, wherein a plate material (206) made of a magnetic material is sandwiched between the gaps of the predetermined distance. A plate-shaped magnet (3) that forms a magnetic field on the surface (1A) of the thin plate-shaped article (1) is disposed on the back surface (1B) of the article (1) to be coated ( A magnetic material coating method for applying a paint (15) containing fine magnetic substance flakes (17) to the surface (1A) of 1) to form a coating film expressing a pattern corresponding to the contour shape of the magnet (3) In
The magnet (3) of the magnet end face corresponding position (19A, 19B) having a peak at the magnet end face corresponding position (19A, 19B) of the article (1) to be coated corresponding to the contour of the magnet (3). approach zero with distance on both sides of the inner and outer direction), the direction of the magnetic field, along parallel to the surface (1A) of the magnet end face corresponding positions (19A, 19B) in the painted (1), the position (19A, 19B) as the distance on either side of the relative sequential tilted vertically next in a direction perpendicular to the surface (1A) of the coated products (1), the further away from opposite sides of the pair of vertical portions surface (1A) A process of forming a magnetic field (13) inclined to a side opposite to the side corresponding to the magnet end face (19A, 19B) toward the parallel side ;
Application process of the paint (15) to the surface (1A) of the article (1) to be coated;
A magnetic material coating method comprising: an aligning step of aligning magnetic flakes (17) contained in the applied paint (15) along the magnetic field (13).   The article to be coated (1) on which the coating film is formed by the magnetic material coating apparatus has a three-dimensional pattern that looks convex by changing the light reflection direction according to the posture of the magnetic flakes (17) after the paint is cured. Of the three-dimensional pattern that is brighter than the surroundings and appears to be raised, and the posture of the magnetic flakes (17) is substantially the same as the painted surface. Of the three-dimensional pattern, the bright portions (23) arranged in parallel and the portions that appear darker than the surroundings and appear to be recessed, and the posture of the magnetic flakes (17) stands with respect to the painted surface A dark portion (25) arranged in a state and a hue between the bright portion (23) and the dark portion (25) of the three-dimensional pattern, and the posture of the magnetic flakes (17) is random with respect to the painted surface And an intermediate portion (29) arranged in the bright portion ( Is the arrangement dark portion (25) on either side of the 3), magnetic coating apparatus of claim 1, wherein said the intermediate portion (29) is disposed outside the dark portion (25). The bright portion (23) is a part of an arch-shaped portion (27) in which the posture of the magnetic flakes (17) is formed in a convex arch shape with respect to the painted surface, and the dark portion (25) 6. The magnetic material coating apparatus according to claim 5, wherein the magnetic material coating apparatus is disposed on both sides of the arched portion (27).

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