JP2018008243A - Method for producing magnetic alignment design medium and magnetic alignment design medium - Google Patents

Abstract

A technique for forming a complex design having a plurality of line drawings having different contrasts by an easy process is provided. A magnetic orientation layer forming step for forming an uncured magnetic orientation layer containing a magnetic anisotropic pigment on a substrate, an orientation step for orienting the pigment, and a magnetic orientation property after the orientation. Curing a layer to obtain an orientation-fixed layer, and a method for producing a magnetic orientation design medium, wherein the orientation step is performed with the substrate laminated on a magnetic plate, and A magnetic plate includes, in the thickness direction, a first region having a first pattern made of a magnetic material and a non-magnetic material, and a second pattern different from the first pattern, made of a magnetic material and a non-magnetic material. A method for producing a magnetic orientation design medium, comprising: a second region having: [Selection] Figure 9

Description

  The present invention relates to a method for manufacturing a magnetic orientation design medium.

  Magnetic orientation design media are widely used as, for example, authentication stickers, high-value-added product logos, measures for preventing counterfeiting of banknotes in various countries, and the like.

  The magnetic orientation design medium is produced, for example, by applying a paint containing a magnetic anisotropic pigment on a substrate to form a coating film, and curing the coating film in a state where a magnetic field is applied thereto.

For example, Patent Document 1 discloses that
While printing is performed on a printing surface of a film-like or sheet-like printing material using ink containing a magnetic pigment having a polarizing property, a magnet is arranged on the printing material, and the action of the magnet In orienting the magnetic pigment in the printing layer formed on the printing surface of the printing material in order to form a desired display portion three-dimensionally on the printing layer,
As the magnet, a double-sided bipolar sheet-like magnet magnetized so that one surface side is an N pole and the other surface side is an S pole, characters, figures, symbols, etc. cut out from the magnet are used. The magnetic printing method is characterized in that the display pattern is arranged so as to face the printed material, and a display unit corresponding to the display pattern appears on the print layer. ing.

  Further, in the above-mentioned Patent Document 1, the magnetic printed matter obtained by the above-described method can exhibit a sharp line drawing pattern that is sufficiently satisfactory for practical use because the orientation of the magnetic pigment is not disturbed in the printed layer. It is explained that it can be done.

  The magnetic printed matter or the magnetic orientation design medium displays a line drawing by controlling the orientation state of the magnetic anisotropic pigment. In general, in many regions of the magnetic orientation design medium, since the magnetic anisotropic pigment is in the “laying” orientation state with respect to the substrate surface and is opaque, the color of the pigment is visually recognized.

  When a region in which magnetic lines of force are bent is formed in a part of the region in such a state, the magnetic anisotropic pigment is aligned along the magnetic lines of force in the region and is “standing” with respect to the substrate surface. Since it becomes a state, the color of the background can be seen through, and a line drawing can be formed from the contrast with the surrounding “sleeping” orientation region.

  The above-mentioned “standing” orientation state with respect to the substrate surface does not stand perpendicular to the substrate surface, but only stands up slightly from the “sleeping” state. Since the rising direction depends on the direction of the lines of magnetic force generated by the applied magnetic field, rising alignment in different directions occurs in the same design medium. Depending on the viewing direction, the line drawing in such an orientation state becomes opaque and the color of the pigment itself can be seen, or it becomes transparent and the color of the ground can be seen. The illusion is.

JP 2009-90624 A JP 2008-142690 A

  According to the technique of the above-mentioned Patent Document 1, the line drawing regions in the “standing” orientation state are substantially the same depending on the degree of the generated magnetic flux, although the orientation direction of the pigment is different, but the rising angle with respect to the substrate is substantially the same. A complex line drawing having a plurality of different contrasts cannot be created.

  In this regard, in the “fifth embodiment” of Patent Document 2, a plurality of coating layers are provided, and a magnetic field having a different intensity is applied to each coating layer, thereby having a complicated line drawing having a plurality of different contrasts. A method for forming a design is described.

  However, such a method has complicated steps, and reduction of the process is desired.

  The present invention has been made in consideration of the above situation. Therefore, an object of the present invention is to provide a technique for forming a complicated design medium having a plurality of different contrast line drawings by an easy process.

  The present invention is summarized in the following embodiments.

[1] A magnetic orientation layer forming step of forming an uncured magnetic orientation layer containing a magnetic anisotropic pigment and a binder on a substrate;
An orientation step of orienting the pigment by applying a magnetic field to the substrate having the magnetic orientation layer;
A curing step for curing the magnetic orientation layer after the orientation to obtain an orientation-fixed layer;
Including a magnetic orientation design medium,
The orientation step is performed in a state where the substrate is laminated directly or via a non-magnetic material on a magnetic plate; and
The magnetic plate is in the thickness direction,
A first region having a first pattern made of a magnetic material and a non-magnetic material; and a second region made of a magnetic material and a non-magnetic material and having a second pattern different from the first pattern. A method for producing the magnetic orientation design medium as described above.

  [2] The method according to [1], wherein an application direction of a magnetic field in the alignment step is within 0.5πsr with respect to a stacking direction of the substrate and the magnetic plate.

  [3] The method according to [1] or [2], wherein the curing step is performed after the application of a magnetic field is canceled after the alignment step.

  [4] The method according to [1] or [2], wherein the curing step is performed while maintaining application of a magnetic field in the alignment step.

[5] a substrate;
An orientation fixing layer on the substrate;
Have
The orientation fixing layer may be a single layer or multiple layers, and a first pattern defined by a first contrast and a second pattern defined by a second contrast different from the first contrast may be included in the same layer. And a magnetic orientation design medium.

  [6] The method according to any one of [1] to [4], for producing the magnetic orientation design medium according to [5].

[7] In the thickness direction,
A first region having a first pattern composed of a magnetic material and a non-magnetic material; and a second region composed of a magnetic material and a non-magnetic material and having a second pattern different from the first pattern. A magnetic plate characterized by comprising:

  [8] The magnetic plate according to [7] for use in the method according to any one of [1] to [4].

  According to the present invention, there are provided a design medium on which a complex design having a plurality of types of line drawings having different contrasts is drawn, a method for forming the design medium by an easy process, a magnetic plate for use in the method, and the like. Is done.

FIG. 1 is a schematic cross-sectional view for explaining an aspect of a magnetic plate in the method of this embodiment. FIG. 2 is a conceptual diagram showing a state of magnetic flux concentration in the conventional magnetic orientation printing. FIG. 3 is a conceptual diagram (part 1) for explaining the principle of the present invention. FIG. 4 is a conceptual diagram (No. 2) for explaining the principle of the present invention. FIG. 5 is a conceptual diagram (part 3) for explaining the principle of the present invention. FIG. 6 is a schematic diagram (a) showing the structure of the magnetic plate of Comparative Example 1, and graphs (b) and (c) showing magnetic field strength distributions when a magnetic field is applied to the magnetic plate. FIG. 7 is a schematic diagram (a) showing the structure of the magnetic plate of Example 1, and graphs (b) and (c) showing magnetic field strength distributions when a magnetic field is applied to the magnetic plate. FIG. 8 is a perspective view (a) showing the shape of the magnetic plate used in Comparative Example 2, and a photograph (b) of the obtained magnetic orientation design medium. FIG. 9 is a perspective view (a) showing the shape of the magnetic plate used in Example 2, and a photograph (b) of the obtained magnetic orientation design medium.

<Method for producing magnetic orientation design medium>
The method of manufacturing the magnetic orientation design medium of the present embodiment is as follows:
A magnetic orientation layer forming step of forming an uncured magnetic orientation layer containing a magnetic anisotropic pigment and a binder on the substrate;
An orientation step of orienting the pigment by applying a magnetic field to the substrate having the magnetic orientation layer;
A curing step for curing the magnetic orientation layer after the orientation to obtain an orientation-fixed layer;
Including a magnetic orientation design medium,
The orientation step is performed in a state where the substrate is laminated directly or via a non-magnetic material on a magnetic plate; and
The magnetic plate is in the thickness direction,
A first region having a first pattern made of a magnetic material and a non-magnetic material; and a second region made of a magnetic material and a non-magnetic material and having a second pattern different from the first pattern. It is characterized by.

  In this embodiment, the magnetic plate used in the orientation process has two types of magnetic patterns that are different in the thickness direction.

The magnetic plate used in the prior art magnetic orientation design medium manufacturing method is:
A region having a pattern made of a magnetic material and a non-magnetic material, or a region having a pattern made of a magnetic material and a non-magnetic material in the thickness direction, and a region made only of a magnetic material and having no pattern. Have
Either.

When using such a magnetic plate and applying a magnetic field in the thickness direction of the magnetic plate,
Magnetic flux concentrates at the boundary between the magnetic material and non-magnetic material in the pattern region, and the magnetic lines of force are bent in this nearby region, so that the magnetic anisotropic pigment in the region is oriented in a standing state;
In other regions, the concentration of magnetic flux does not occur, and the lines of magnetic force are linear, so that the magnetic anisotropic pigment is maintained in a lying orientation, and a line drawing due to the difference in orientation is obtained. FIG. 2 shows the state of magnetic flux generated in the conventional method for producing a magnetic orientation design medium.

  Actually, the color of the pigment observed is exactly the same in and out of the region surrounded by the line defined by the standing orientation of the magnetic anisotropic pigment. However, the area surrounded by the line defined by the standing orientation of the magnetic anisotropic pigment appears to float or sink with respect to the substrate surface, giving the viewer a relief-like impression. This is the reason why it is said that the magnetic orientation design medium can be stereoscopically viewed.

  The line drawing obtained by the above-described conventional method for producing a magnetic orientation design medium consists of one gradation. The “line drawing” in the present specification is a concept including not only a pattern expressed by a clear line but also a pattern expressed by a line lacking in clarity with a line border.

  In contrast to the conventional method for producing a magnetic orientation design medium, in the case of this embodiment, a magnetic plate having a first region and a second region having different magnetic patterns in the thickness direction is used, and the magnetic plate A magnetic field is applied in the thickness direction of the plate. In the present specification, unless otherwise specified, a region closer to a substrate having a magnetic orientation layer arranged in a stacked manner will be described as a first region, and a region far from the substrate will be described as a second region.

First, the case where the nonmagnetic material region (opening) in the first region is smaller than the nonmagnetic material region (opening) in the second region will be described with reference to FIG. When the orientation process is performed using the magnetic plate of FIG. 3, the magnetic flux concentration due to the application of the magnetic field is not limited to the boundary between the magnetic material and the nonmagnetic material in the first region, but the magnetic material and the nonmagnetic material in the second region. It also occurs weakly in the area corresponding to the boundary. Of the magnetic flux lines in FIG. 3, attention should be paid to the magnetic flux lines with circles.
And comparing the degree to which the magnetic lines of force are bent by these magnetic flux concentrations, the first region is larger than the second region, so that the magnetic anisotropy pigment stands up when it is oriented upright. There will be a degree of strength, and the line drawing obtained will consist of at least two gradations.

  FIG. 4 shows a case where the nonmagnetic material region (opening) in the first region is larger than the nonmagnetic material region (opening) in the second region. In this case, the magnetic flux concentration occurs at substantially the same level at the boundary between the magnetic material and the nonmagnetic material in the first region and at the boundary between the magnetic material and the nonmagnetic material in the second region. However, the magnetic field lines bent by the magnetic flux concentration in the first region directly affect the orientation of the magnetic anisotropic pigment on the substrate, whereas the distance between the magnetic flux concentration position in the second region and the substrate is long. Therefore, the influence of the magnetic field lines bent in the region on the orientation of the magnetic anisotropic pigment is slightly reduced. Therefore, when the magnetic anisotropic pigment is oriented in a standing manner, there is a strength level in the “standing” degree, and the obtained line image is composed of at least two gradations.

  FIG. 5 shows a case where there is no special magnitude relationship between the nonmagnetic material region (opening portion) in the first region and the nonmagnetic material region (opening portion) in the second region, but the positions of both are shifted. is there. In this case, the multiple gradations in FIG. 3 and the multiple gradations in FIG. 4 occur simultaneously. Therefore, the obtained line drawing consists of at least two gradations.

  The difference in the degree to which the magnetic field lines are bent can be controlled by the thickness of the first region. That is, the thicker the first region, the larger the contrast difference, and the thinner the first region, the smaller the contrast difference. However, if the first region is excessively thick in order to obtain a large contrast difference, a line image with a weaker contrast may not be visible. Specific guidelines regarding the thickness of each region in this embodiment will be described later.

  Hereinafter, each process in the manufacturing method of the magnetic orientation design medium of this embodiment is demonstrated sequentially.

[Magnetic orientation layer forming process]
The magnetic orientation layer forming step in the method for producing a magnetic orientation design medium of the present embodiment is a step of forming an uncured layer containing a magnetic anisotropic pigment and a binder on a substrate.

  Here, as the substrate, a substrate made of a material that does not hinder the orientation of the magnetic orientation layer by the magnetic flux can be suitably used. For example, a substrate made of synthetic resin, paper, ceramic, or the like can be used. Examples of the synthetic resin include polyolefin, polyester, poly (meth) acrylic resin, and the like, such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), and the like. Is preferred.

  As the shape of the substrate, a flaky shape, a sheet shape or the like is recommended.

  Although the thickness of a board | substrate is arbitrary, it can be 12 micrometers or more, 20 micrometers or more, or 30 micrometers or more, for example, can be 200 micrometers or less, 150 micrometers or less, 100 micrometers or less, or 70 micrometers or less. The thickness of the substrate is most preferably about 50 μm (for example, 40 μm or more and 60 μm or less).

  In order to form a magnetic orientation layer on such a substrate, first, a composition containing a magnetic anisotropic pigment and a binder (magnetic anisotropic pigment composition) is prepared and placed on the substrate. This can be done. The magnetic anisotropic pigment composition can be, for example, a paint, ink, or the like.

  As the magnetic anisotropic pigment composition, for example, a composition obtained by mixing a magnetic anisotropic pigment with commercially available ink can be used. As an ink used here, according to the method employ | adopted in the process of arrange | positioning a composition in a board | substrate form, for example, a silk screen printing ink, a flexographic printing ink, etc. can be selected suitably, and can be used. These inks are preferably curable inks such as UV curable type, two-component curable type, and evaporative drying type, and particularly preferably UV curable type silk screen printing ink or flexographic printing ink.

  As the magnetic anisotropic pigment mixed with the ink, a magnetic pigment having shape anisotropy can be used. For example, in addition to magnetic materials such as magnetite, hematite, red iron oxide pieces and iron oxide pieces, mica coated with iron oxide, aluminum pieces coated with iron oxide, and the like can be used. The shape of these pigments can be, for example, a scale shape or a plate shape.

As the magnetic anisotropic pigment, a pearl pigment having magnetic anisotropy having a scale-like shape and a mass magnetic susceptibility of 10 ⁻⁶ m ³ / kg Z (SI unit) or less is preferable. For example, the pigment described in Patent Document 2 can be preferably used.

  The particle size (major axis) of the magnetic anisotropic pigment in the present embodiment can be 5 μm or more, or 10 μm or more, and 60 μm or less, 50 μm or less, 40 μm or less, 30 μm or less, or It can be 25 μm or less.

  Commercially available products can be used as the magnetic anisotropic pigment in the present embodiment. Examples of commercially available products that can be applied to this embodiment include Iriodin 5 series manufactured by MERCK (model number notation starts with “5”); MERCK manufactured by Meoxal, Wahiba Orange, Takramakan Gold, and the like.

  If the pigment concentration in the magnetic anisotropic pigment composition is too thin, the resulting magnetically oriented design medium will have insufficient contrast. Accordingly, the pigment concentration in the magnetic anisotropic pigment composition is preferably 1% by weight or more, more preferably 5% by weight or more in terms of solid content. On the other hand, when the pigment concentration is too high, the pigments interfere with each other and are difficult to align, and the resulting magnetic alignment design medium has insufficient contrast. Accordingly, the pigment concentration in the magnetic pigment composition is preferably 20% by weight or less, and more preferably 15% by weight or less. The pigment concentration in the magnetic anisotropic pigment composition is most preferably about 10% by weight (for example, 8% by weight to 12% by weight).

  By disposing the magnetic anisotropic pigment composition as described above on the substrate, a magnetic pigment layer can be formed on the substrate.

  The magnetic pigment composition can be arranged on the substrate by, for example, a coating method, a printing method, or the like. In the industry, coating refers to uniformly arranging a composition on a substrate using a means such as a coater; printing means arranging in a pattern on a substrate by a printing machine. However, in this specification, the uniform arrangement of the composition by a coater or the like is also included in the concept of “printing”.

  The arrangement of the magnetic anisotropic pigment composition on the substrate is preferably by silk screen printing or flexographic printing, particularly preferably silk screen printing. Here, when silk screen printing is employed, a mesh made of Teflon (registered trademark) can be used. The mesh opening can be, for example, 80 mesh / inch or more or 90 mesh / inch or more, for example, 200 mesh / inch or less, 150 mesh / inch or less, or 120 mesh / inch or less. . The mesh opening is most preferably about 100 mesh / inch (for example, 95 mesh / inch or more and 110 mesh / inch or less).

  The thickness of the magnetic orientation layer is preferably 5 μm or more, and preferably 10 μm or more from the viewpoint of obtaining a good orientation state in the orientation step described later. On the other hand, if the thickness of the magnetic orientation layer is excessively large, a curing (drying) failure of the magnetic orientation layer may occur in the curing step described later, and a printing failure such as peeling may occur. From this viewpoint, the thickness of the magnetic orientation layer is preferably 50 μm or less, and more preferably 40 μm or less.

[Orientation process]
Next, an orientation process is performed in which a magnetic field is applied to the substrate having the magnetic orientation layer to orient the pigment.

  This orientation process is performed in a state where the substrate is laminated on the magnetic plate. Here, when laminating the substrate on the magnetic plate, the substrate may be directly laminated so that the substrate is in contact with the magnetic plate, or indirectly laminated on the magnetic material via a non-magnetic material. Here, examples of the nonmagnetic material include air, water, aluminum, copper, titanium, stainless steel, rubber, and synthetic resin. A typical example of indirectly laminating a substrate on a magnetic plate is a case where the substrate is arranged via an air layer between the magnetic plate and the substrate (that is, with a certain interval between them). is there. The distance between the magnetic plate and the substrate is preferably about 2 mm or less from the viewpoint of obtaining a visible contrast.

The magnetic plate used in the method of this embodiment is in the thickness direction,
A first region having a first pattern made of a magnetic material and a nonmagnetic material, and a second region made of a magnetic material and a nonmagnetic material and having a second pattern different from the first pattern.

  In the above description, the thickness direction of the magnetic plate refers to a direction perpendicular to the main surface (surface having a larger area) of the magnetic plate. In many cases, the thickness direction of the magnetic plate is a direction parallel to the shortest side of the magnetic plate.

  The magnetic plate comprises a third region having a third pattern different from the pattern of the first region and the pattern of the second region, comprising a magnetic material and a non-magnetic material other than the first region and the second region. Furthermore, you may have. When the magnetic plate has a third region, the third region may be present at a position that does not overlap the first region and the second region in the thickness direction of the magnetic plate. The position of the third region in the thickness direction of the magnetic plate (the order of presence of the first and second regions in the thickness direction) does not matter. In the thickness direction of the magnetic plate, the first region, the second region, and the third region may be in order from the side closer to the stacked substrate, or the first region, the third region, and the second region. The order may be the order of the third area, the first area, and the second area. Furthermore, you may have the 4th or more area | region which has another pattern in the arbitrary positions in the thickness direction of a magnetic board.

  In this embodiment, when the magnetic plate is observed from a direction parallel to the thickness direction, there are a plurality of regions where at least a part of the boundary line between the magnetic body and the non-magnetic body forming the pattern can be seen at the same position. It does not exclude the case.

  When the magnetic plate has the third region, three types of orientations with different degrees of “standing” of the magnetic anisotropic pigment are possible. Therefore, a more complicated magnetic orientation design having at least three types of line drawings with different contrasts. A medium will be obtained.

  In addition to the first region and the second region, the magnetic plate may further include one or more regions made of a magnetic material or a non-magnetic material and having no pattern. When the magnetic plate has a region having no pattern, the region is present at a position that does not overlap with the first region and the second region (and the third region or more when present). The lamination position of this area | region is not ask | required.

The magnetic plate in the method of this embodiment is
After forming the 1st field and 2nd field which have each pattern as each layer, it may manufacture by stacking these, and it may be by other methods. The aspect of the magnetic plate in the method of this embodiment will be described with reference to the drawings. In the following drawings, the fine hatched portions represent magnetic materials, and the rough hatched portions and non-hatched portions represent nonmagnetic materials.

  The magnetic plate in FIG. 1A is an embodiment in which a first region and a second region formed as separate layers having respective patterns are laminated in the thickness direction. The magnetic plate in FIG. 1B is formed by performing a plurality of excavations with different depths from the same surface of a single material, and defining a region defined by shallow excavation as a first region, for example, and by deep excavation. For example, the region is formed as the second region. The magnetic plate in FIG. 1C is an example in which the excavation position is changed in FIG. In this case, in order to protect the protruding portion remaining after excavation, it is preferable to fill the white portion in the figure with a solid nonmagnetic material. FIG. 1D shows an example in which the surface of a material having a cavity inside is excavated and the depth of excavation is made to coincide with the bottom surface of the cavity. The internal cavity can be formed by excavating from the side of the magnetic plate. The magnetic plate in FIG. 1 (e) combines magnetic materials having different heights in the horizontal direction (meaning a direction perpendicular to the direction of a magnetic field applied in an orientation process described later. The same applies hereinafter). In this embodiment, a recess having different depths is created, and a region defined by the shallow recess is defined as, for example, a first region, and a region defined by the deep recess is defined as, for example, a second region. The magnetic body in FIG. 1 (f) is excavated from each of the front and back surfaces of a single material, and the region defined by the surface excavation is defined as the first region, for example, and the region defined by the excavation of the back surface is defined as This is an aspect formed as the second region.

  In the above, each magnetic plate of FIG.1 (b)-(f) further has the area | region which does not have a pattern other than a 1st area | region and a 2nd area | region. The region having no pattern may be above or below the first region and the second region (FIGS. 1B to 1E), or may be between the first region and the second region. (FIG. 1 (f)).

  In any of the above embodiments, the corners of each pattern may not be chamfered separately or may be smooth with an R.

  The thicknesses of the first region, the second region, and the optional third or more regions can be set to 1 mm or more, or 2 mm or more, respectively, from the viewpoint of recognizing the contrast difference of at least two gradation line drawings. . In addition, from the viewpoint of making it possible to visually recognize a line image having a weak contrast, the magnetic plate is formed from the substrate-side surface of the region farthest from the stacked substrate among the first region, the second region, and any third or more regions. The distance to the substrate side surface can be 10 mm or less, 8 mm or less, or 6 mm or less. Within a range that does not deviate from these conditions, there is a pattern between the adjacent two of the first region, the second region, and any third region or more, or on the substrate side surface or the back surface of the magnetic plate. An area not to be used may be provided.

  The thickness of the entire magnetic plate can be 2 mm or more or 5 mm or more.

  As the magnetic material in the magnetic plate, a metal exhibiting ferromagnetism can be used. Specifically, for example, iron, cobalt, nickel, stainless steel, gadolinium, etc., and alloys (for example, permalloy, etc.) composed of a plurality of these metals. Particularly preferred is pure iron.

  Examples of the non-magnetic material in the magnetic plate include air, water, aluminum, copper, titanium, stainless steel, rubber, resin (typically a synthetic resin), and aluminum is particularly preferable.

  When the magnetic plate in this embodiment is composed of a plurality of members, each member may be fixed to each other regardless of whether the member is a magnetic material or a non-magnetic material. It does not have to be fixed. It is sufficient that the desired magnetic plate shape is maintained at least when a magnetic field is applied in the next orientation step. For example, the effect of the present invention is also exhibited by an aspect in which a plurality of members are installed on an electromagnet to form a desired magnetic plate shape, a substrate having a magnetic orientation layer is installed thereon, and a magnetic field is applied. be able to.

  Then, by applying a magnetic field in a state in which a substrate having a magnetic orientation layer is laminated on a magnetic plate in which magnetic regions having different patterns exist in the thickness direction as described above, the magnetic anisotropic pigment “ Since two kinds of orientations having different “standing” degrees are possible, a magnetic orientation design medium having at least two kinds of line drawings having different contrasts can be obtained.

  When a substrate having a magnetic orientation layer is installed on the magnetic plate, the installation position on the surface of the magnetic plate is arbitrary. However, it is preferable to adjust the installation position so that the line drawing formed with the magnetic anisotropic pigment in the “standing” state is at a desired position on the substrate.

  The board | substrate which has a magnetic pigment layer is laminated | stacked and installed in the thickness direction of a magnetic board. For example, in the case of a magnetic plate having a first region and a second region in the thickness direction, the substrate is typically placed on the first region of the magnetic plate.

  The orientation step in the method of this embodiment is a step of orienting the pigment having magnetic anisotropy by applying a magnetic field to the substrate having the magnetic orientation layer and the magnetic plate. The direction in which the magnetic field is applied is arbitrary. In the method of this embodiment, a magnetic orientation design medium having at least two gradations of line images can be obtained even when a magnetic field is applied in a direction horizontal to the substrate surface. However, from the viewpoint of increasing the design difference of the design medium by increasing the gradation difference between the strong contrast line drawing and the weak contrast line drawing, a magnetic field is applied in the direction substantially the same as the thickness direction of the magnetic plate. Is preferred.

  Here, the magnetic orientation design having a good contrast difference line drawing by making the depth direction of the magnetic plate, the lamination direction of the substrate and the magnetic plate, and the application direction of the magnetic field substantially the same direction. A medium can be obtained. “Substantially the same” means that these three directions are within a solid angle of 0.5πsr (steradian), preferably within 0.3πsr, more preferably within 0.2πsr. Particularly preferably, it is within 1πsr.

  In the orientation process in the present embodiment, a magnetic plate and a substrate having a magnetic orientation layer laminated on the magnetic plate are arranged between, for example, an S pole and an N pole of an electromagnet, and the thickness direction of the magnetic plate and the substrate is an SN pole. It can be carried out by arranging them so as to be substantially the same as the direction between them and applying a magnetic field between both poles. The magnetic field strength to be applied can be, for example, 300 mT or more (millitesla), 500 mT or more, 600 mT or more, or 700 mT or more in order to form a line drawing with sufficient contrast as the value of the magnetic field strength in the gap 20 mm. On the other hand, from the viewpoint of being able to recognize a strong and weak contrast difference and suppressing the manufacturing cost of the design medium, it can be 1,000 mT or less, 900 mT or less, or 800 mT or less.

  The magnetic field application time in the alignment step is preferably continued at least until the magnetic anisotropic pigment reaches the alignment state, and can be, for example, 1 second or more, 2 seconds or more, or 12 seconds or more. The upper limit of the magnetic field application time is not technically limited, but may be appropriately set from the viewpoint of not excessively increasing the design medium manufacturing cost.

[Curing process]
The curing step in the method for producing a magnetic orientation design medium of the present embodiment is a step of obtaining the orientation-fixed layer by curing the magnetic orientation layer oriented as described above. Since the curing step is performed for the purpose of fixing the alignment state obtained in the alignment step, it is preferable to perform the curing step while maintaining the obtained alignment state. Therefore, this curing process can be performed while maintaining the application of the magnetic field in the alignment process, or if the alignment state of the magnetic anisotropic pigment is not changed, the application of the magnetic field in the alignment process is canceled. You may go on.

  The curing method is preferably performed in accordance with the curing method of the ink contained in the magnetic anisotropic pigment composition used in the magnetic orientation layer forming step. For example, the curing step can be performed by irradiation with ultraviolet rays when a UV curable ink-based composition is used, and by hot air drying when an evaporation-drying ink-based composition is used.

  As described above, the magnetic orientation design medium of the present embodiment can be obtained.

  Using the obtained magnetic orientation design medium as a substrate, a cycle comprising a magnetic orientation layer forming step, an orientation step, and a curing step is repeated as necessary, so that a magnetic material having a multi-layered fixed orientation layer on the substrate is obtained. It is also possible to obtain an oriented design medium.

<Magnetic orientation design medium>
As described above, the magnetic orientation design medium of the present embodiment can be manufactured. The orientation fixing layer in the magnetic orientation design medium of the present embodiment may be a single layer or a multilayer.

  The thickness per orientation-fixed layer in the magnetic orientation design medium of the present embodiment is 10 μm or more from the viewpoint of adjusting the orientation of the magnetic anisotropic pigment generated in the orientation step to a desired level in the orientation step. Alternatively, it can be 20 μm or more, and from the same viewpoint, it can be 40 μm or less.

The orientation fixed layer in the magnetic orientation design medium of the present embodiment has at least two types of line drawings having different contrasts in the same layer. Therefore, the magnetic orientation design medium of this embodiment is
A substrate;
An orientation fixing layer on the substrate;
Have
The orientation fixing layer is a single layer or multiple layers, and has a first pattern defined by a line segment having a first contrast and a second contrast different from the first contrast in the same layer. And a second pattern defined by the line segment. The image forming apparatus may further include a third pattern defined by a line segment having a third contrast different from both of the first contrast and the second contrast.

  The other regions in the magnetic orientation design medium of the present embodiment are in an orientation state in which the magnetic anisotropic pigment lies on the substrate surface and are opaque, so that the color of the pigment is visually recognized. On the other hand, each of the above-mentioned line drawings having different contrasts in the magnetic orientation design medium of the present embodiment is in an orientation state in which the magnetic anisotropic pigment is slightly raised with respect to the substrate surface. Is done. The base color may be the color of the substrate itself when the substrate is colored, or the object (for example, paper) placed under the magnetic orientation design medium when the substrate is transparent. It can be a color.

  In the above, since the rising direction of the pigment orientation depends on the direction of the magnetic flux, the rising orientation in different directions occurs in the same orientation fixing layer. Therefore, depending on the direction of the viewing field, the color of the pigment itself can be seen opaque, or the color of the ground can be seen transparent, so the observer can view the pattern represented by such a line drawing as a three-dimensional image. The illusion is.

  In the magnetic orientation design medium of the present embodiment, there is also a magnitude relationship in the rising angle of the pigment orientation in the same orientation fixed layer. That is, the rising angle of the pigment orientation is large in the region where the bending of the magnetic force line is large in the alignment step, and the rising angle of the pigment orientation is small in the region where the bending of the magnetic force line is small. This increases the number of line drawing approval / disapproval patterns in the visual field of view, thus enabling more precise three-dimensional expression. This is laid down below.

  In the magnetic orientation design medium of the prior art, the rising angle was substantially the same, although there was a difference in the rising direction in the orientation state of the pigment in the same layer. For this reason, the line drawings expressed by the rising orientation of the pigment looked the same uniformly, and the stereoscopic effect was the same.

  However, in the magnetic orientation design medium of this embodiment, the orientation state of the pigments in the same layer has a rising angle in addition to the rising direction, and a plurality of patterns with different stereoscopic effects are observed.

  As described above, since the orientation state of the pigment is the same in the region other than the line drawing, the color of the pigment itself is observed with the same color tone, but the surface of the pigment floats with respect to the substrate surface due to the presence of the line drawing. Or, since it is illusioned to appear to sink, more precise three-dimensional expression becomes possible.

Specifically, for example,
A design in which the pattern defined by the high-contrast line drawing appears to be further lifted in the area that is confirmed and lifted by the low-contrast line drawing;
A design that appears to be superimposed, with a pattern that is defined by a high-contrast line drawing and appears to be raised high, and another pattern that is defined by a low-contrast line drawing and appears to be raised low;
A design that is defined by a low-contrast line drawing and appears to float, and a pattern that is defined by a high-contrast line drawing and appears to sink, constitutes a single meaning as a whole;
A design in which a stereoscopic image viewed when viewed from the right side of the design medium is different from a stereoscopic image viewed when viewed from the left side of the design medium;
Etc. can be expressed.

  Whether the portion surrounded by the line drawing of the magnetic orientation design medium appears to float or sink depends on the observer, so at least one of the lifting state and the sinking state in the above example is the reverse direction Should be understood to be disclosed as well. Furthermore, the above examples should be understood as non-limiting illustrations of this embodiment rather than absolute limiting listings.

<Comparative example 1 (prior art)>
The magnetic field strength at each point on the magnetic plate when a magnetic field was applied to the magnetic plate was examined. The magnetic body is made of pure iron, has a plate shape with a long side of 50 mm, a short side of 30 mm, and a thickness of 14 mm, and has a through hole with a diameter of 5 mm in the center. The through hole is filled with air which is a nonmagnetic material. The measurement of the magnetic field intensity is performed on a straight line parallel to the long side passing through the center of the through hole, with the center of the through hole as the part 1, the circumferential point of the through hole as the part 2, and the outer end of the magnetic plate as the part 9. It performed about each measurement site | part set to the equal interval from the site | part 1 to the site | part 9 (refer Fig.6 (a)).

Among the above-mentioned parts, the results for the respective parts 1 to 8 in the region usually used for the production of the magnetic orientation design medium using the magnetic plate are shown in FIGS. 6B and 6C. . The magnetic field was applied using the following system.
Electromagnet: Model “D0311A” manufactured by Electromagnetic Industry Co., Ltd.
Power source: Kikusui Electronics, model “PAN60-10A”
Current setting: 10.49A, 16.7V
Magnetic field strength measuring device: Model “GAUSSMETER GM-301”, manufactured by Electronic Magnetic Industry Co., Ltd.

<Example 1>
An experiment was performed in the same manner as in Comparative Example 1 except that the magnetic plate (FIG. 7A) in which the following first region and second region were laminated in the thickness direction of the magnetic material was used as the magnetic plate. .
First region: pure iron, long side 50 mm, short side 30 mm, 5 mm thick plate, through hole with a diameter of 5 mm in the center, the through hole filled with air Second region: pure iron, long side 50 mm, short side 30 mm , 10 mm thick plate shape, 20 mm long side direction, 30 mm short side direction recess in the center, the recess filled with non-magnetic aluminum

  The first region is the same as the magnetic plate in Comparative Example 1 except for the thickness. Therefore, the magnetic plate of Example 1 corresponds to the shape of Comparative Example 1 in which a second region having a larger non-magnetic region is laminated under the same planar magnetic plate. Among the measurement results of the magnetic field strength performed for the nine sites set in the same manner as in Comparative Example 1, the results for each of the sites 1 to 8 are shown in FIGS. 7B and 7C.

  The magnetic field strength distribution of Comparative Example 1 (FIGS. 6B and 6C) was substantially the same except that it was slightly stronger at the portion 2 of the through-hole circumferential portion. The reason why the magnetic field strengths of the part 3 and the part 8 are slightly increased is considered to be under the influence of the distances between the part 2 and the magnetic plate outer edge portion where the magnetic field strength is high.

  In contrast, in the magnetic field strength distribution of Example 1 (FIGS. 7B and 7C), it can be seen that the magnetic field strength of the part 5 is increased in addition to the high magnetic field strength of the part 2. This portion 5 corresponds to the edge of the hole in the second region.

  From the above Comparative Example 1 and Example 1, the basis of the manifestation of the effect of the present invention was analytically verified.

<Comparative example 2 (prior art)>
This comparative example is an example of the prior art, and as a magnetic plate, a plate made of pure iron, having a long side of 50 mm, a short side of 30 mm, and a thickness of 14 mm, has a character width of 20 mm, a character height of 18 mm, and a line width of 5 mm. This is an example of manufacturing a magnetic orientation design medium using a magnetic plate having a “T” -shaped cut-out portion. The shape of the magnetic plate used in this comparative example is shown in FIG. The cut-out portion is filled with air.

  10 parts by weight of magnetic pearl pigment “Meoxal Wahiba Orange” manufactured by MERCK is added to 90 parts by weight of UV curable silk screen vehicle “Rotary Screen Medium” manufactured by Jujo Chemical Co. A product was prepared.

  As the substrate, a transparent PET film having a thickness of 50 μm was used.

  The magnetic anisotropic pigment composition was coated on the substrate using an automatic screen printer manufactured by Onda Seisakusho and a Teflon (registered trademark) printing plate having a mesh size of 100 mesh / inch. Formed.

  A substrate having the magnetic orientation layer was placed on the magnetic plate, and a magnetic field was applied in the same manner using the same system as in Comparative Example 1. Then, the magnetic orientation design medium was manufactured by irradiating and hardening | curing a magnetic orientation layer on a board | substrate with an ultraviolet-ray. A photograph of the resulting design medium is shown in FIG.

<Example 2>
A magnetic orientation design medium was manufactured in the same manner as in Comparative Example 1 except that a magnetic plate (FIG. 9A) in which the following first region and second region were laminated in the thickness direction of the magnetic material was used.
First region: made of pure iron, plate-like with a long side of 50 mm, a short side of 30 mm, and a thickness of 5 mm, and a “T” -shaped cut-out portion having a character width of 20 mm, a character height of 18 mm, and a line width of 5 mm is formed in the center. Is filled with air. Second region: Made of pure iron, plate shape with long side 50 mm, short side 30 mm, thickness 10 mm, concave part with long side direction 20 mm, short side direction 30 mm in the center, concave part filled with air

  A photograph of the magnetic orientation design medium obtained in Example 2 is shown in FIG. In FIG. 9B, the shape derived from the “T” shape of the first region can be seen with a strong contrast, and a line segment with a weak contrast caused by the edge of the recess in the second region (indicated by an arrow) , A slightly bright area on both sides of the “T” character).

Claims (8)

A magnetic orientation layer forming step of forming an uncured magnetic orientation layer containing a magnetic anisotropic pigment and a binder on the substrate;
An orientation step of orienting the pigment by applying a magnetic field to the substrate having the magnetic orientation layer;
A curing step for curing the magnetic orientation layer after the orientation to obtain an orientation-fixed layer;
Including a magnetic orientation design medium,
The orientation step is performed in a state where the substrate is laminated directly or via a non-magnetic material on a magnetic plate; and
The magnetic plate is in the thickness direction,
A first region having a first pattern made of a magnetic material and a non-magnetic material; and a second region made of a magnetic material and a non-magnetic material and having a second pattern different from the first pattern. A method for producing the magnetic orientation design medium as described above.   2. The method according to claim 1, wherein a magnetic field application direction in the alignment step is within 0.5πsr with respect to a lamination direction of the substrate and the magnetic plate.   The method according to claim 1, wherein the curing step is performed after the application of a magnetic field is canceled after the alignment step.   The method according to claim 1, wherein the curing step is performed while maintaining application of a magnetic field in the alignment step. A substrate,
An orientation fixing layer on the substrate;
Have
The orientation fixing layer may be a single layer or multiple layers, and a first pattern defined by a first contrast and a second pattern defined by a second contrast different from the first contrast may be included in the same layer. And a magnetic orientation design medium.   The method as described in any one of Claims 1-4 for manufacturing the magnetic orientation design medium of Claim 5. In the thickness direction,
A first region having a first pattern composed of a magnetic material and a non-magnetic material; and a second region composed of a magnetic material and a non-magnetic material and having a second pattern different from the first pattern. A magnetic plate characterized by comprising:   The magnetic plate according to claim 7 for use in the method according to any one of claims 1 to 4.