JP2002067527A - Screen printing plate and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screen printing plate capable of erasing a resin coating film formed on a metal screen fabric by using a laser having excellent stability without giving a damage to the screen fabric and a method for manufacturing the same. SOLUTION: A carbon black of 0.1 mass% or more is contained in the metal screen fabric 12, and the resin coating film 13 in which an absorbance is enhanced in an oscillation wavelength of a laser beam is formed. When the laser beam is emitted to the film 13, an optical energy of the beam 14 is efficiently absorbed in a part 13a to be emitted, and converted into a thermal energy. Hence an influence of giving the beam to the screen fabric is suppressed. A resin of the part 13a is decomposed by the converted thermal energy, evaporated, and an opening 15 is formed without giving a damage to the screen fabric 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for forming a resin coating on a metal screen gauze by irradiating the resin coating with a laser beam in a predetermined pattern. And a method of manufacturing the screen printing plate having a predetermined pattern of openings formed by erasing the pattern.

[0002]

2. Description of the Related Art Heretofore, as a method of manufacturing a screen printing plate used for printing an outer box of a vending machine, a dial of a timepiece, or the like, a method using a pattern mask and a photoresist is known.

In the above-mentioned conventional method, for example, when a negative resist is used, the surface of a coating film formed on a metal screen gauze is coated with a photoresist, a pattern mask made of a positive film is overlaid, and a pattern mask is formed. The exposed portions of the photoresist are cured by irradiating light, such as ultraviolet rays, from above. Then, the uncured portion is washed and removed with a solvent to produce a screen printing plate having a pattern in which the light-impermeable portion of the pattern mask has escaped. In the case where a positive resist is used, the exposed portion is removed without curing, contrary to the above, so that exposure may be performed using a pattern mask made of a negative film.

However, the above-described conventional method has a problem in productivity because a pattern mask preparation and a cleaning step are required. In addition, there is a problem that the cost of chemicals used in the cleaning process is high, a problem that it is necessary to consider a waste liquid treatment facility and a process for preventing an environmental problem due to a waste liquid of these chemicals, and furthermore, ultraviolet curing does not occur. There was a problem that resin could not be used. On the other hand, for example,
Japanese Patent Application Laid-Open No. 4-8003 discloses that after a patterned metal foil is bonded to a screen via an adhesive, a laser beam is irradiated from the surface on the metal foil side to form an adhesive on the pattern portion (opening) of the metal foil. A method for producing a screen printing plate by evaporating and removing is disclosed.

[0005] However, this method cannot be said to have high productivity because a process such as photoetching is required when producing a patterned metal foil.

Japanese Patent Application Laid-Open No. Sho 64-82945 discloses a method of manufacturing a screen printing plate by coating an opening of a screen with a lacquer and removing the lacquer individually from the opening through which ink is to be transmitted by a laser device. Is disclosed.

Further, Japanese Patent Application Laid-Open No. 3-72364 discloses that
A glass transition point is a screen plate in which a metal screen gauze laminated with a sheet of a polymer having a temperature of 100 ° C. or higher is attached to a frame, while moving the screen plate in a plane so as to draw a predetermined image.
There is disclosed a method of producing a screen printing plate by irradiating a laser beam having a wavelength of 150 to 400 nm to decompose a high molecular weight substance into a low molecular weight substance and scatter the same to produce a screen printing plate.

According to the method of forming a pattern by irradiating a laser beam as described above, it is not necessary to perform operations such as manufacturing a pattern mask and washing / removing an uncured portion of a photoresist. Improvement can be expected.

[0009]

In order to form a pattern by irradiating a laser beam, it is necessary to erase the coating film formed on the metal screen gauze by the laser beam and not to damage the metal screen gauze. Needed. In order not to damage the metal screen gauze, it is conceivable to use an excimer laser as the laser beam. However, the excimer laser requires time and effort to handle because the light source is unstable and there is a problem in the stability of oscillation. There was a problem. In addition, when using a YAG laser or a carbon dioxide gas laser, the stability is excellent, but since infrared or far infrared rays are used, even if the optical system is focused with sufficient care during laser irradiation, only the coating film can be used. However, there is a possibility that the metal screen gauze may be damaged, and not only the coating film but also the metal screen gauze may be burned.

Accordingly, an object of the present invention is to provide a screen printing plate capable of erasing a resin coating applied to a metal screen gauze without damaging the metal screen gauze using a laser beam, and a method of manufacturing the same. It is in.

[0011]

In order to achieve the above object, a screen printing plate of the present invention comprises a metal screen gauze having a resin film heat-erasable by a laser beam, and a laser coating on the resin film. A screen printing plate in which the resin coating is thermally erased by irradiating light in a predetermined pattern to form openings of a predetermined pattern, wherein the resin coating contains 0.1% by mass or more of carbon black. It is characterized by being.

The method of manufacturing a screen printing plate according to the present invention comprises forming a heat-erasable resin coating film on a metal screen gauze by a laser beam, and irradiating the resin coating film with a laser beam in a predetermined pattern. A method for producing a screen printing plate, wherein the resin coating is thermally erased to form openings of a predetermined pattern, wherein the resin coating contains carbon black in an amount of 0.1% by mass or more.

According to the present invention, the resin film formed on the metal screen and heat-erasable by laser light contains carbon black in an amount of 0.1% by mass or more. By increasing the absorbance at the oscillation wavelength of the laser light, the energy of the laser light can be efficiently absorbed by the resin coating, and the proportion of the laser light transmitted through the resin coating can be reduced. Therefore, the light energy can be efficiently converted into heat energy for decomposing and erasing the resin coating film, and the effect of the laser beam on the metal screen gauze can be suppressed without damaging the metal screen gauze. The resin coating can be erased.

Further, since a carbon dioxide gas laser beam or a YAG laser beam having better oscillation stability than an excimer laser can be used, the productivity can be improved as compared with the case where an excimer laser is used.

In the present invention, the resin coating is
It is preferable to contain 1 to 20% by mass of carbon black, and it is particularly preferable to contain 2 to 7% by mass. The resin coating has an absorbance per 1 μm of film thickness.
It is preferably 0.07 Abs / μm or more.

[0016]

1 to 3 show one embodiment of a method for producing a screen printing plate according to the present invention.
FIG. 1 is a perspective view showing a portion of a screen printing plate before a predetermined pattern is created. FIG. 2 is a perspective view showing a state in which a resin coating film is erased by a laser beam by cutting a part of a screen printing plate. FIG. 3 is a perspective view showing the completed screen printing plate.

As shown in FIG. 1, the screen printing plate 11
Is formed by applying and forming a resin coating film 13 which can be thermally erased by a laser beam on a metal screen gauze 12.

The metal screen gauze 12 is made of stainless steel, amorphous metal fiber or nickel as a main component.
It consists of a metal mesh of 0 to 500 mesh, preferably 80 to 400 mesh. For example, high mesh (product name, manufactured by Stokes) and Alpha Screen (product name, manufactured by Dainippon Screen) can be used.

The resin coating 13 is made of a coating composition obtained by adding carbon black to a resin composition which can be thermally erased by laser light.
It is formed by applying to the metal screen gauze 12.

Examples of the resin forming the resin coating film 13 include polyimide resin, polyetherimide resin, fluorine resin, polyarylate resin, polysulfone resin, silicon resin, polybutyral resin, vinyl acetate emulsion, polyvinyl alcohol, Polyether sulfonic acid, polycarbonate, polyamide resin, and the like can be used, and a vinyl acetate emulsion and polyvinyl alcohol are particularly preferable. When ultraviolet curing is performed, a condensate of diazodiphenylamine and formaldehyde may be added.

The carbon black added to the resin preferably has a particle size of about 10 μm. The amount of carbon black added is adjusted so that the amount of carbon black in the formed resin coating film 13 is 0.1% by mass or more, preferably 1 to 20% by mass, more preferably 2 to 7% by mass. If the added amount of carbon black in the resin coating 13 is less than 0.1% by mass, light energy cannot be efficiently converted to heat energy, and the resin coating 13 is prevented while preventing the metal screen gauze 12 from being damaged. Cannot be dissipated by heat. The resin coating has a thickness of 1μ.
The absorbance per m is preferably 0.07 Abs / μm or more. The thickness of the resin coating 13 is preferably 3
５００500 μm, more preferably 5-100 μm. Further, it is preferable that the carbon black added to the resin composition constituting the paint is dispersed by using a dispersing means such as ultrasonic waves, red devil, dynomir, and nanomizer. In addition, you may add a dispersing agent to the said resin composition as needed.

As shown in FIG. 2, the resin coating 13 of the screen printing plate 11 is irradiated with a laser beam 14, and the resin coating 13 in a predetermined portion is thermally decomposed by the laser beam 14 to be eliminated. Can be formed.

When the resin film 13 is irradiated with the laser beam 14, the laser beam 14 is absorbed in the irradiated portion 13a, and the light energy is converted into heat energy. Then, the high-molecular resin of the irradiated portion 13a is decomposed into low-molecules, and is evaporated by the heat energy, so that the openings 15 are formed. Here, by scanning the laser light 14 in the direction of the arrow A, the opening 15 extends linearly in the direction of the arrow A, and a slit-like opening is formed. The laser beam 14 is irradiated by changing the excitation current using a Q switch, and the laser beam 14 is scanned along a CAD pattern to form a predetermined pattern 16 as shown in FIG. Can be. The screen printing plate 11 may be placed on an XY table, fixed without scanning the laser beam 14, and the screen printing plate 11 may be moved to form a predetermined pattern.

According to the above-described manufacturing method, the energy of the laser beam 14 is efficiently absorbed by the resin coating 13 and hardly reaches the metal screen gauze 12, so that the metal screen gauze 12 is not damaged and the residual resin It is possible to form a stable opening with a small coating film, thereby realizing high-definition printing by screen printing. In addition, a pattern can be formed simultaneously with the irradiation of the laser beam,
Since it is not necessary to prepare a mask pattern and develop the exposed resist film (wash and remove uncured portions), all the steps can be performed by a dry process, so that waste liquid treatment equipment is not required. Furthermore, since a desired pattern can be formed by exposing a laser beam with CAD data, it is possible to reduce the lead time until plate making and improve productivity.

[0025]

EXAMPLES (Test Example 1) A stainless steel mesh 180-count (wire diameter 50 μm) was stretched on an aluminum frame.
A coating liquid “MC-No. 2” (trade name, manufactured by Mesh Co., Ltd.) composed of an ultraviolet curable resin containing a vinyl acetate emulsion as a main component is applied so as to have a thickness of 10 μm, and then applied by irradiating ultraviolet rays. A screen printing plate was prepared by curing the film. At this time, as described later,
Various coating films were formed by changing the amount of carbon black added to “MC-No. 2”.

Next, a laser marker “FAL” capable of scanning an Nd: YAG laser having a wavelength of 1.06 μm while controlling image processing using CAD software by a computer.
-50 V "(trade name, manufactured by Fuji Electric Co., Ltd.), feed pitch: 0.1 mm, excitation current: 16.0 A, frequency: 4.5 kHz
Laser irradiation was performed in the air at room temperature under the irradiation conditions of z and a scanning speed of 180 mm / s to form a pattern on the screen printing plate. Then, the prepared screen printing plate was evaluated by visual observation and printing.

The evaluation of the absorbance of the coating film was performed according to the following procedure. First, the coating liquid “M” was placed on a 50 × 50 mm glass plate.
C-No. 2 ", 500 rpm, time 1
Spin coating was performed under the condition of 0 s to form a coating film. The thickness of the formed coating film was measured using a step gauge. Next, UV
Using a lamp "HANDY UV100" (trade name, manufactured by ORC), the distance between the light source and the screen printing plate is 60c.
m, irradiating for 30 minutes for curing, and measuring the absorbance at 1.06 μm using a spectrophotometer “U-3410” (trade name, manufactured by Hitachi, Ltd.) to obtain a film thickness of 1 μm.
Per absorbance was determined.

Incidentally, the coating films subjected to the test are as follows.・ Comparative Example 1: no addition of carbon black ・ Example 1: addition of 0.1% by mass of carbon black ・ Example 2: addition of 1% by mass of carbon black ・ Example 3: addition of 2% by mass of carbon black ・ Execution Example 4 Addition of 5% by mass of carbon black Example 5 Addition of 10% by mass of carbon black Example 6 Addition of 15% by mass of carbon black (Test Example 2) In Test Example 1, the screen printing plate was irradiated. The laser beam is converted to the second harmonic (wavelength 5) of the YAG laser.
30 nm) and the absorbance measurement wavelength was 0.53 μm. Otherwise, the test was performed in the same manner as in Test Example 1.

The coating films subjected to the test are as follows. Comparative Example 2 No addition of carbon black Example 7 Addition of 0.1% by weight of carbon black Example 8 Addition of 1% by weight of carbon black Example 9 Addition of 2% by weight of carbon black Example 10: Addition of 5% by mass of carbon black Example 11: Addition of 10% by mass of carbon black Example 12: Addition of 15% by mass of carbon black The results of Test Examples 1 and 2 are shown in Table 1.

[0030]

[Table 1]

As shown in Table 1, irrespective of the wavelength of the laser oscillation device, if the addition amount of carbon black is 0.1% by mass or more, the surface of the resin coating film evaporates at the laser irradiation part. It was confirmed that an opening having a sharp edge and no residue could be formed, and that a good image could be formed in printing, which was comparable to that which required a conventional pattern mask.

Further, the absorbance increases with an increase in the amount of carbon black added. However, at 10% by mass or more, the effect of the addition of carbon black on the increase in absorbance becomes saturated, and the increase in the absorbance corresponding to the increase in the amount of carbon black does not increase. It was confirmed that it could not be expected. Therefore, the amount of carbon black added is 0.1
-20% by mass, and particularly preferably 2-7% by mass, where the effect is the highest.

[0033]

As described above, according to the present invention,
On a metal screen gauze, a resin film that can be heat-erased by a laser beam is formed, and the resin film is irradiated with a laser beam in a predetermined pattern, thereby thermally erasing the resin film to form an opening in a predetermined pattern. When the resin coating is used, the one containing carbon black in an amount of 0.1% by mass or more is used.
To increase the absorbance at the oscillation wavelength of the AG laser light, efficiently absorb the energy of the laser light into the resin coating, reduce the proportion of laser light transmitted through the resin coating, and reduce the light energy to evaporate the resin coating. It can be efficiently converted to heat energy. Therefore, the effect of the laser beam on the metal screen gauze can be suppressed, and the resin coating can be erased without damaging the metal screen gauze.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a part of a screen printing plate before a predetermined pattern is created.

FIG. 2 is a perspective view showing a state in which a resin coating film is erased by a laser beam by cutting a part of a screen printing plate.

FIG. 3 is a perspective view showing a completed screen printing plate.

[Explanation of symbols]

 REFERENCE SIGNS LIST 11 screen printing plate 12 metal screen gauze 13 resin coating 14 laser beam 15 opening

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shinichi Orikasa 1-1, Tanabeshinda, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture F-term in Fuji Electric Co., Ltd. 2H084 AA14 AE05 BB07 BB08 CC10 2H114 AB04 AB05 BA01 DA03 DA04 DA50 DA51 DA64 EA01 EA02 EA08 FA10 GA11

Claims (6)

[Claims] 1. A resin screen that can be heat-erased by a laser beam is formed on a metal screen gauze, and the resin film is irradiated with a laser beam in a predetermined pattern, thereby thermally erasing the resin film to a predetermined level. A screen printing plate having openings formed in a pattern, wherein the resin coating contains 0.1% by mass or more of carbon black. 2. The resin coating according to claim 1, wherein carbon black is 1
The screen printing plate according to claim 1, wherein the content of the screen printing plate is from 20 to 20% by mass. 3. The screen printing plate according to claim 1, wherein the resin coating has an absorbance per μm of film thickness of 0.07 Abs / μm or more. 4. A resin screen that can be heat-erased by a laser beam is formed on a metal screen gauze, and the resin film is irradiated with a laser beam in a predetermined pattern, thereby thermally erasing the resin film to a predetermined level. A method for producing a screen printing plate for forming an opening of a pattern, wherein a resin containing 0.1% by mass or more of carbon black is used as the resin coating film. 5. The resin coating according to claim 1, wherein the carbon black is 1
The method for producing a screen printing plate according to claim 4, wherein the content of the screen printing plate is from 20 to 20% by mass. 6. The method for producing a screen printing plate according to claim 4, wherein the resin coating has an absorbance per 1 μm of film thickness of 0.07 Abs / μm or more.