JPH05150689A - Pattern presenting method - Google Patents

Abstract

PURPOSE:To rapidly fix a pattern formed of magnetic powder, to shorten time required for a series of work and to efficiently execute this kind of pattern presenting processing in a method for forming a character or a pattern in which the magnetic powder is set as a pattern presenting element. CONSTITUTION:A pattern presenting material 3 is adjusted by a magnetic powder 5 and ultraviolet curing resin 6. The pattern presenting material 3 is applied to an object 1 such as a base film or plastic moldings, and the magnetic powder 5 dispersed inside the material 3 is attracted and coagulated by a magnet 4, so that the desired pattern 2 is formed. In such a state, the material 3 is irradiated with ultraviolet rays so as to fix a pattern 2 in a short time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pattern expressing method for forming a visible pattern such as characters, symbols and patterns on the surface of an object, the surface of a sheet or a film, etc. Intended for forms using powder.

[0002]

2. Description of the Related Art As a pattern expressing method using a magnetic powder as a pattern expressing element, a form shown in FIG. 6 is known (literature unknown). This is the magnetic powder 2 on the surface of the base film 20.
1 is mixed with the pattern-exposing material 22 and the magnetic powder 2
1 is adsorbed from the back side of the base film 20 by the magnet 23 to form a pattern having the same shape as the magnet 23,
The pattern is fixed after waiting for the solvent in the pattern-expressing material 22 to evaporate and dry. The pattern-exposing material 22 is obtained by mixing the magnetic powder 21 into the vehicle that constitutes the printing ink.

In the case of printing, which is a general pattern expression method, the printing ink adhering to the plate is transferred to the target surface to form a thin film-like pattern. The magnetic powder 21 is attracted by the magnet 23 to form a predetermined pattern, and a three-dimensional pattern can be obtained as compared with printing. Therefore, a perspective and a sense of depth can be visually obtained. It has the characteristics of.

[0004]

In the above pattern exposing method, as the thickness of the pattern exposing material layer is increased and the viscosity of the vehicle is further decreased, the movement of the magnetic powder 21 in the vehicle becomes easier. A sharp and three-dimensional pattern can be obtained. However, the thicker the pattern-exposing material layer, the longer the time required for the solvent to evaporate and cure. If the viscosity of the vehicle is small, the magnetic powder 21
Is likely to move and lose its shape, the magnet 23 must be attracted until the vehicle hardens to some extent and the movement of the magnetic powder 21 is restricted, and the cycle time for magnetic attraction becomes long. That is, it takes a long time to fix the formed pattern, and the cost required for the pattern formation increases accordingly.

For example, it is easy to reduce the thickness of the pattern-exposing material layer or increase its viscosity, but in this case, it becomes difficult for the magnetic powder to move, so it takes time to finish forming the pattern. It will cost. In any case, the conventional method has a problem in that a series of operations from pattern formation to fixing cannot be efficiently performed.

An object of the present invention is to perform a series of operations from the formation of a pattern by magnetic powder to the fixing thereof quickly, and to efficiently form a pattern rich in three-dimensional effect and sharpness, which is excellent in productivity. It is about obtaining the expression method.

[0007]

The pattern exposing method of the present invention prepares a liquid or paste-like pattern exposing material 3 containing magnetic powder 5 and an ultraviolet curable resin 6, and the pattern exposing material 3 is used. Applying and fixing to the surface of the target object 1 and applying the magnetism of the magnet 4 from at least one side of the target object 1 to agglomerate the magnetic powder 5 in the pattern expression material 3 in a state in which the magnetic force distribution state matches the desired state. The pattern 2 is to be formed, and the pattern exposing material 3 is irradiated with ultraviolet rays to fix the pattern 2.

Specifically, the pattern-exposing material 3 is irradiated with ultraviolet rays while the magnet 4 is still magnetized. When the object 1 is made of a transparent material, it is possible to irradiate ultraviolet rays from both front and back surfaces of the object 1. It is possible to form the desired pattern 2 by arranging the magnets 4 on both front and back surfaces of the object 1. A desired pattern 2 can be formed by sandwiching the object 1 coated with the pattern expression material 3 and arranging the magnet 4 on one side and the magnetic metal plate on the other side, respectively.

[0009]

The UV-curable resin 6 begins to cure at the same time as it receives UV irradiation, and completes in a very short time.
The pattern 2 formed of the magnetic powder 5 can be quickly fixed.

[0010]

INDUSTRIAL APPLICABILITY In the present invention, magnetic powder 5 is dispersed in an ultraviolet curable resin 6, which is agglomerated by a magnet 4 to form a desired pattern 2 and the pattern expression material 3 is irradiated with ultraviolet rays. By doing so, the pattern 2 can be quickly fixed. Therefore, for example, the pattern expression material 3
Even when the layer thickness is large or its viscosity is low,
The formed pattern 2 can be fixed quickly without causing the shape to be deformed, and the series of operations from pattern formation to fixing can be speeded up to efficiently form the pattern 2 rich in three-dimensional appearance and sharpness, and the magnetic powder as a whole. 5 can be used to perform pattern expression processing at low cost.

[0011]

1 to 3 show an embodiment of a pattern expressing method according to the present invention. In this embodiment, a case where a plastic film is used as an object 1 and a pattern 2 such as characters or patterns is formed on the upper surface thereof will be described.

In FIG. 1, the target pattern 2 is obtained by applying the adjusted pattern-exposing material 3 to the entire front surface of the object 1 and applying the magnetism of the magnet 4 from the back side of the object 1. , The magnetic powder 5 included in the pattern expression material 3
The pattern forming step B for forming the desired pattern 2 and the fixing step C for fixing the formed pattern 2 are continuously formed in an intermittent manner.

Materials for forming the plastic film as the object 1 include polyvinyl chloride, polyethylene, polystyrene, polyester, polypropylene, polyacryl, polyvinyl alcohol, polyvinylidene chloride, polyvinyl acetate, polyamide, polytetrafluoroethylene,
Polyvinyl acetal, polyformaldehyde, cellophane, polyvinyl fluoride and the like can be used.

As shown in FIG. 1 (b), the pattern-exposing material 3 has the paste-like UV-curable resin 6 having a low viscosity in which the magnetic powder 5 is evenly dispersed, and if necessary, an auxiliary agent and an additive. And adjust. The UV curable resin 6 is formed by mixing a photopolymerization-reactive monomer, oligomer, polymer and a polymerization initiator, and is made of an acrylic resin, an epoxy resin, a urethane resin, an unsaturated polyester resin, a vinyl chloride-vinyl acetate copolymer resin. A transparent or semi-transparent resin that is cured by ultraviolet rays, such as Spyrac, can be used. As the magnetic powder 5, ferrite, gamma-hematite, chromium dioxide, an iron oxide alloy in which cobalt ions or a cobalt compound is added to or adsorbed in iron oxide, magnetic alloy powder containing pure iron as a main component, and the like can be used. The mixing ratio of the magnetic powder 5 to the ultraviolet curable resin 6 should be changed according to the fineness of the pattern 2 to be formed, the degree of three-dimensional effect desired to be exposed, and the coating film thickness of the pattern exposing material 3. 5 to 45 wt% is suitable for the pattern expression of a typical pattern, and 25 to 40 wt% is preferable for the pattern expression of a higher definition.

In the coating step A, the adjusted pattern expression material 3 is uniformly coated on the surface of the object 1 by a spray coating machine 7 or a coating machine such as a roll coater, a knife coater or a gravure coater. In this coating state, the magnetic powder 5 is evenly dispersed in the ultraviolet curable resin 6. When the coating thickness is 10 μm or less,
Since the sharpness of the finished pattern 2 is low and the three-dimensional effect cannot be sufficiently obtained, the thickness of the coating film is set to 20 μm or more, more preferably 80 μm or more.

In the pattern forming step B, the magnet 4 plays the role of a plate when forming a pattern by printing. 1 (a) and 1 (c), the magnet 4 is formed as an electromagnet by a core 4a and a winding 4b wound around the core 4a, and is used to form the pattern 2 on the upper end surface of the core 4a. A group of salient poles 4c is provided. Salient pole 4
c can be formed by etching or electric discharge machining. When the object 1 having the front surface coated with the pattern expression material 3 is placed, and the salient poles 4c are positioned on the back surface of the object 1 and the winding 4b is energized, the magnetic powder 5 dispersed in the pattern expression material 3 Moves toward the nearest salient pole 4c and is attracted to the salient pole 4c via the object 1. That is, the magnetic powder 5 that has been evenly dispersed is aggregated on the upper portion of each salient pole 4c to form the same pattern 2 as that of the salient pole 4c on the interface side with the object 1 of the pattern expression material 3.

In the fixing step C, FIG. 1 (a) and FIG.
As shown in (d), while the magnetic force of the magnet 4 is still applied, the ultraviolet lamp 9 above the pattern exposing material 3 is turned on to irradiate the pattern exposing material 3 with ultraviolet rays. Then, the ultraviolet curable resin 6 is cured to fix the pattern 2. Curing takes only a few seconds. In this cured state, the magnetic powder 5 is agglomerated at the formation portion of the pattern 2, so that its color (generally black) is visually recognized, while the color of the object 1 or the color through the object 1 is visually recognized. It FIG. 2 shows an example of the completed pattern 2.

The object 1 obtained as described above has a protective layer formed on the surface of the pattern-exposing material 3 and an adhesive layer and a release paper layer formed on the back surface of the object 1 and then formed into a predetermined shape. Completed by punching. That is, it becomes a label. This label is attached to the surface of, for example, an automobile or a household electric appliance, and used as a decoration purpose or an index.

As shown in FIG. 3, if the salient poles 4c are formed in a trapezoidal shape, a triangular shape, or a semicircular shape, the distribution amount of the agglomerated magnetic powder 5 can be made smaller as it approaches the contour line. , It is convenient for forming blurred characters and patterns.

(Other Embodiment) As shown in FIG. 4, the pattern can be formed by arranging the magnet 4 on the surface of the pattern exposing material 3. In this case, the pattern is formed on the upper surface side of the pattern exposing material 3. The pattern 2 can be formed in a floating state. Prior to the pattern formation, the pattern-exposing material 3 is irradiated with ultraviolet rays for a short time to cure only its surface, or if a transparent separation film is preliminarily laminated on the surface of the pattern-exposing material 3, the magnetic powder 5 will be formed. It can be prevented from adhering to the magnet 4. In this embodiment, the magnet 4 is used as the pattern expression material 3
The ultraviolet rays are irradiated after moving to the outside of the upper surface of the magnet, but if the object 1 is made of a transparent film,
It is also possible to fix the pattern 2 by irradiating ultraviolet rays from the lower surface side of the object 1 with the magnetic powder 5 adsorbed.

As shown in FIG. 5, the pattern 2 can be formed by arranging the magnets 4 on both front and back surfaces of the object 1. In this case, since the pattern 2 can be formed in a state in which the upper surface side and the lower surface side of the pattern expression material 3 are offset, for example, the lower surface side pattern 2 is a striped pattern and the upper surface side pattern 2 is a solid character. By displaying the upper and lower patterns 2 in different expression states, various visual effects can be obtained. By arranging a magnetic metal plate in place of either the upper or lower magnet 4, the lines of magnetic force pass vertically through the pattern-exposing material 3, so that the outline of the pattern 2 can be clarified.

The present invention can also be applied to forming characters and patterns on the surface of plastic molded products and metal processed products. In this case, screen printing, offset printing, pad printing, etc. is applied to the surface of the object with the pattern-exposing material, and the magnetism of the magnet is applied from the outer surface or the inner surface side of the material, and the magnetic powder in the pattern-exposing material is used. Form the desired pattern. Next, the pattern exposed material is irradiated with ultraviolet rays to fix the pattern. The ultraviolet curable resin 6 and the magnetic powder 5 may be colored.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a pattern forming process and a processing state in each process.

FIG. 2 is a plan view showing an example of a completed pattern.

FIG. 3 is a side view showing a salient pole shape of a magnet.

FIG. 4 is a side view showing another embodiment in which the arrangement of magnets is changed.

FIG. 5 is a side view showing another embodiment in which the arrangement of magnets is changed.

FIG. 6 is an explanatory diagram showing a conventional pattern expression method.

[Explanation of symbols]

 1 object 2 pattern 3 pattern exposed material 4 magnet 4c salient pole 5 magnetic powder 6 ultraviolet curable resin 9 light source A coating process B pattern formation process C fixing process

Claims (5)

[Claims] 1. A liquid or paste pattern expression material 3 containing magnetic powder 5 and an ultraviolet curable resin 6 is prepared, and the pattern expression material 3 is applied and fixed on the surface of the object 1. At least one surface of the pattern-exposing material 3 is acted on by magnetism to agglomerate the magnetic powder 5 in the pattern-exposing material 3 in a state in which the distribution of magnetic forces is consistent to form a desired pattern 2, and the pattern-exposing material 3 is exposed to ultraviolet rays. A pattern exposing method of irradiating and fixing the pattern 2. 2. The pattern exposing material 3 is irradiated with ultraviolet rays while the magnet 4 is still magnetized.
The described pattern expression method. 3. The pattern exposing method according to claim 1, wherein the object 1 is made of a transparent material, and ultraviolet rays are irradiated from both front and back surfaces of the object 1. 4. The pattern exposing method according to claim 1, wherein the desired pattern 2 is formed by arranging the magnets 4 on both sides of the object 1. 5. The object 1 to which the pattern expression material 3 is applied.
4. The pattern exposing method according to claim 1, wherein the desired pattern 2 is formed by disposing the magnet 4 on one side and the magnetic metal plate on the other side with the magnet sandwiched therebetween.