JP3492652B2 - Printing screen 紗 - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing screen scissors suitable for photoengraving, and in particular, enables precise printing of printed wiring and the like. 2. Description of the Related Art As a printing screen ridge, a 100-800 mesh cocoon-shaped woven fabric is woven using thin wire rods made of stainless steel having a diameter of 10 to 50 μm as warps and wefts. Is known, in which the above warp and weft are coated with a vapor deposition film having an amorphous structure made of stainless steel and having a thickness of 10 to 1000 nm (see JP-A-8-118835). This printing screen wrinkle is superior in wettability with respect to printing ink, toner, and printing paste as compared with the above-described one having no vapor deposition film, and therefore can be printed precisely. However, since the above-mentioned printing screen wrinkles are made of stainless steel with the surface of warp and weft being light-reflective, a water-soluble emulsion made of an ultraviolet curable resin is applied and dried at the time of photoengraving. When one side of the resulting screen is exposed to ultraviolet rays through an original mask and exposed to light, part of the ultraviolet rays that enter the photosensitive layer is reflected on the surface of the warp or weft, and this reflected light However, there is a problem that the photosensitive layer of the portion which does not need to be exposed is exposed to light and cured, so that the area of the cured portion becomes wider than the design and the holes through which printing ink or the like passes become narrow. FIG. 1 is a sectional view showing a state in which a photosensitive layer 11 is formed on a conventional screen 10.
Is woven with stainless steel warp yarns 10a and weft yarns (not shown), has a stainless steel vapor-deposited film (not shown), and the photosensitive layer 11 is made of the above-mentioned UV curable resin. Has been. 12 is an original mask,
When the original mask 12 is superposed on the surface of the photosensitive layer 11 and irradiated with ultraviolet rays L, a part of the photosensitive layer 1 is formed by the shadow portion 12b.
1 is blocked, but the remainder enters the photosensitive layer 11 through the transparent portion 12a, and is exposed and cured. The ultraviolet rays L incident on the photosensitive layer 11 are further divided into those that are reflected upon hitting the warp 10a or the weft and those that pass through the photosensitive layer 11 without being hit.
a enters the photosensitive layer 11 under the shadow portion 12b, and this portion is exposed and cured. When the above exposure is completed, the screen rod 10 with the original mask 12 removed is subjected to development together with the photosensitive layer 11, and this process removes the non-photosensitive portion of the photosensitive layer 11 while leaving the photosensitive portion 11, and printing ink. And a hole through which paint can pass is formed, and a printing plate (screen type) 13 (see FIG. 2) is obtained. Therefore, when there is no ultraviolet light La incident on the lower part of the shadow part 12b, the printing plate 13 is formed with a hole 13a having the same shape as the shadow part 12b as shown in FIG. Actually, there is ultraviolet light La incident below the shadow portion 12b,
As shown in FIG. 2B, the holes 1 formed in the printing plate 13
3a has a trapezoidal cross section in which the upper part is almost equal to the shadow part 12b and the lower part is narrow. In the present invention, ultraviolet rays are incident on the photosensitive layer below the shadow portion during photoengraving by improving the screen ridges using stainless steel wires as warps and wefts. In the photosensitive layer, a hole with the same shape as the original mask is formed, thereby improving the transparency of printing ink, toner, printing paste, paste, etc., and enabling the precise printing required in printed circuits. is there. [0007] A printing screen scissors according to the present invention comprises at least one surface of a scissors-like fabric woven using thin stainless steel wires for warps and wefts. It is coated with an antireflection film for the ultraviolet consisting thing or carbide or magnesium fluoride, this
The antireflection film is a physical vapor deposition film having a thickness of 3 to 250 nm.
The reflectivity for ultraviolet light with a wavelength of 250 to 450 nm is
15% or less, the transmittance is characterized der Rukoto 45% or more. The screen wrinkle according to the present invention is integrated with a photosensitive layer made of an ultraviolet curable resin according to a conventional method at the time of photolithography, and the surface of the obtained screen, that is, warp and weft are coated with an antireflection film. Overlay the original mask on the side that is exposed to ultraviolet rays, then develop and wash away the unexposed areas by washing with water to make a printing plate (screen type), but at least one side of the thin stainless steel wire that constitutes the warp and weft Is coated with an antireflection film for ultraviolet rays, the reflected light from the antireflection film is greatly reduced upon irradiation with ultraviolet rays. Even if there is a portion that is not covered with the antireflection film, the portion is located on the opposite side of the original mask, so that it is not exposed to ultraviolet rays for exposure. Therefore,
The ultraviolet rays are not incident on the photosensitive agent below the shadow portion of the original mask and the portion is not cured, so that a hole having the same shape as the shadow portion is formed by development and washing, and the printing plate having the same pattern as the original mask ( Screen type). The antireflection film is made of an oxide, nitride or carbide, or magnesium fluoride of a metal such as titanium, zinc, nickel, chromium and silicon.
This antireflection film is particularly preferably a physical vapor deposition film. Since these physical vapor deposition films have conductivity together with the stainless steel constituting the warp and the weft, it is possible to prevent troubles caused by electrostatic charging. And since it is a physical vapor deposition film, it is excellent in peeling resistance. Further, by performing physical vapor deposition toward the surface of the cocoon-shaped woven fabric, the vapor deposition film is widely formed across the front side half circumference of the warp and weft to the back side. FIG. 3 shows a screen cage 15 according to the present invention.
The antireflection films 16a and 1 are formed on the surface sides of the warp 16 and the weft 17 made of stainless steel wire, respectively.
7a is formed. One side of screen cage 15 (Fig. 3
When the vapor of the metal oxide or the like is blown downward by physical vapor deposition from above, the vapor is mainly the warp 16
And a deposited film made of a metal oxide having substantially the same composition as the above metal oxide or the like is formed on the upper surface of the weft 17.
By setting the thickness appropriately, the antireflection film 16
Although a metal oxide is blown off in the form of steam, a part of the warp yarn 16 and the weft 17 are attached to the lower surface of the warp yarn 16 and the weft yarn 17 so that the antireflection films 16a and 17a are warped yarn 16 and weft yarn 17 It is formed over a wider range than half of one side. The reflectance of the printing screen provided with the antireflection film is preferably 15% or less, particularly with respect to ultraviolet rays having a wavelength of 250 to 450 nm. Becomes difficult. In order to obtain the above reflectance, the thickness of the antireflection film is set to 3 to 2 by controlling the deposition time and the like when performing the physical vapor deposition.
It is preferable to set to 50 nm. The transmittance is
It is preferably 45% or more with respect to the above ultraviolet rays. And
By selecting one having the above wavelength as the ultraviolet ray, it becomes possible to use a photosensitive ultraviolet curable resin for the ultraviolet ray in the above range, and the handling becomes easy. The antireflection film may be a single layer, but the reflectance can be further reduced as a multilayer structure composed of two or more kinds of antireflection films having different refractive indexes. Further, when the antireflection film is formed on both the front and back surfaces, the permeability of printing ink, toner, printing paste, paste, etc. is further improved. In the present invention, the stainless steel constituting the warp and the weft is a martensitic, ferritic, austenitic or other stainless steel, in particular, austenitic stainless steel to which molybdenum is added (for example, SUS316) is particularly preferable in that it is excellent in corrosion resistance, chlorine resistance, acid resistance, and the like. In this invention, the above thin wire made of stainless steel is used as the warp and weft of the woven fabric.
-50 μm, particularly preferably 15-30 μm, 10 μm
If it is less than 50 μm, it is extremely difficult to print a thin line. The density of the screen ridge is 100-80.
0 mesh, particularly 250-700 mesh is preferred.
If the density is less than 100 mesh, it is impossible to print and print a precise pattern composed of fine lines. On the other hand, if the density exceeds 800 mesh, production becomes difficult. The woven structure of the screen wrinkles is preferably a structure having a uniform vertical and horizontal opening surface that hardly causes misalignment such as a flat structure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 A 250-700 mesh plain woven fabric is woven using stainless steel wire having a wire diameter of 15-30 μm for warp and weft, and this is woven into a cocoon-like fabric (screen cocoon original fabric). And a metal oxide such as titanium oxide is sputter-deposited on the surface side to form an antireflection film having a thickness of 3 to 250 nm on the warp and weft.
A water-soluble emulsion made of an ultraviolet curable resin is applied to the obtained screen ridge and dried to form a photosensitive layer, and an original mask is superimposed on the surface (warp / weft antireflection film side) to irradiate ultraviolet rays. Next, development and washing with water yield a printing plate (screen mold) having the same pattern as the original mask. Since this printing plate has both wettability and conductivity, the back side at the time of printing is good, and there is no obstacle due to electrostatic charging, and extremely precise printing is possible. FIG. 4 shows an example of a sputtering apparatus, in which a flat plate-like target 21 made of titanium is fixed on a hollow target source 22 with the surface facing upward at a lower portion of a sealable chamber 20.
The target 21 is cooled from the lower surface with the cold water passed through. An anode 23 is horizontally installed on the left and right above the target 21, and the anode 23 and the target 2
A DC voltage of 500 to 1000 V is applied between 1 and DC power source E. Above the anode 23 is a water cooling cylinder 2.
4 is installed horizontally and rotatably, and the feeding shaft 25 of the cocoon-shaped fabric F made of the above-mentioned stainless steel wire is provided at the upper left thereof.
However, the winding shaft 26 of the screen ridge Fa is horizontally and rotatably installed on the upper right. Then, the cocoon-shaped fabric F wound around the delivery shaft 25 is drawn out, wound around the water-cooled cylinder 24 via the upper left guide roller 27a, and then wound around the upper right guide roller 27b.
Rolled up. Further, the vacuum pump 2 is provided in the chamber 20.
8. An argon gas supply gas cylinder 29a and an oxygen gas supply gas cylinder 29b are connected to each other. In the above apparatus, the feeding shaft 25, the winding shaft 26 and the water-cooling cylinder 24 are rotated so that the woven fabric F
Water-cooled cylinder 2 while feeding it counterclockwise at a predetermined speed
4 is cooled, and the surface temperature of the basket-like woven fabric F is maintained at 60 ° C. or lower. On the other hand, the vacuum pump 28 is driven and the chamber 2 is driven.
The internal pressure of the chamber 20 is reduced to about 1.3 × 10 ⁻³ Pa, then argon gas is introduced from the argon gas supply gas cylinder 29a to adjust the internal pressure of the chamber 20 to about 6.6 × 10 ⁻² Pa, Then, oxygen gas is introduced from the gas cylinder 29b for supplying oxygen gas, and the pressure in the chamber 20 is set to 1.3 × 10 ⁻¹ Pa.
After that, a DC voltage of 500 to 1000 V is applied between the anode 23 and the target 21 to cause the titanium to jump out of the target 21, and this titanium is reacted with oxygen gas to form titanium oxide. Is attached on the warp and weft of the above-mentioned saddle-like fabric F,
More than half of the warp and weft are covered with a deposited film of titanium oxide. At this time, the thickness of the vapor-deposited film is controlled to 3 to 250 nm by adjusting the feeding speed of the cocoon-shaped fabric F to obtain an antireflection film,
Get screen 紗 Fa. When zinc, nickel, chrome, silicon or the like is used instead of titanium for the target 21,
An antireflection film made of oxides of zinc, nickel, chrome and silicon can be obtained. Embodiment 2 In Embodiment 1 described above, nitrogen gas is used in place of oxygen gas, and in the same manner as Embodiment 1, other metals such as titanium, zinc, nickel, chromium, silicon are reacted with nitrogen gas. Thus, an antireflection film made of nitride is formed. Embodiment 3 In Embodiment 1 above, methane gas is used in place of oxygen gas, and in the same manner as Embodiment 1, other metals such as titanium, zinc, nickel, chromium, silicon, etc. are separated from methane gas. It reacts with gas, thereby forming an antireflection film made of carbide. Embodiment 4 In Embodiment 1 above, magnesium fluoride is used in place of titanium of the target 21, and the use of the oxygen gas supply gas cylinder 29b is stopped, and sputtering is performed in an argon gas atmosphere. Then, an antireflection film made of magnesium fluoride is formed. Embodiment 5 In the above Embodiments 1 to 4, after the sputtering from the one side of the screen blank F is finished, the original F is attached upside down and the second sputtering is performed from the back side. An antireflection film can be formed on the entire surface of the warp and the weft. In this case, the wettability is further improved. And as shown in FIG. 5, when two sets of sputtering apparatuses are installed in a chamber, front and back sputtering can be performed continuously. In FIG. 5, reference numeral 30 denotes a sealed chamber, in which a first water-cooling cylinder 31 and a second water-cooling cylinder 32 are juxtaposed on the left and right of the center, and the left first water-cooling cylinder 31 is counterclockwise and the right-hand side. The second water-cooled cylinder 32 is rotated clockwise by driving. A feeding shaft 33 for the basket-like fabric F is installed above the first water-cooling cylinder 31 and a winding shaft 34 for the screen basket F is installed above the second water-cooling cylinder 32 so as to be rotatable. And the cocoon-shaped fabric F drawn out from the feed shaft 33 is wound so that the back surface is in contact with the first water-cooled cylinder 31 via the first guide roller 35a,
The first water cooling cylinder 31 to the second guide roller 35
b, and the upper third guide roller 35c, fourth
It is guided to the guide roller 35d, passes over the winding shaft 34, passes through the lower fifth guide roller 35e, and is wound so that the surface is in contact with the second water-cooled cylinder 32.
It is separated from the water-cooled cylinder 32 through the sixth guide roller 35f and taken up by the take-up shaft 34 as a screen rod Fa. The first water-cooled cylinder 31 and the second
Below the water-cooled cylinder 32, a pair of left and right first anodes 37 and second anodes 38 are installed.
Then, a water-cooled first target source 39 and a second target source 40 are installed below the first anode 37 and the second anode 38, respectively, and titanium is respectively formed on the first target source 39 and the second target source 40. A flat plate target 31 is fixed, and a DC power source E having a voltage of 500 to 1000 V is interposed between the first anode 37 and the first target source 39 and between the second anode 38 and the second target source 40, respectively. The In the above structure, the feeding shaft 33, the winding shaft 34, and the water-cooled cylinders 31, 32 are rotated, and the basket-like fabric F is fed from the feeding shaft 33 at a predetermined speed.
While the water cooling cylinder 31 and the second water cooling cylinder 32 are sequentially brought into contact with each other and taken up by the take-up shaft 34, the first water cooling cylinder 31 cools the cocoon-shaped fabric F from the back side,
The second water cooling cylinder 32 cools from the front side. On the other hand, a vacuum pump (not shown) connected to the sealed chamber 30 is driven to reduce the internal pressure of the sealed chamber 30 to about 1.3 × 10 ⁻³ Pa, and then an argon gas supply gas cylinder (not shown) (6) Argon gas is introduced to adjust the internal pressure of the sealed chamber 30 to 6.
The pressure in the chamber 30 is adjusted to about 1.3 × 10 ⁻¹ Pa by adjusting the pressure to about 6 × 10 ⁻² Pa and further introducing oxygen gas from a gas cylinder for oxygen gas supply (not shown). Thereafter, the first anode 37 and the first
Between the target source 39 and the second anode 38 / second
A DC voltage is applied between the target sources 40 to cause titanium to jump out of the flat target 41 and to react with oxygen to form titanium oxide. This is the surface of the woven fabric F on the first water cooling cylinder 31 and the second water cooling. Cylinder 3
2 is attached to the back surface of the upper woven fabric F and rapidly cooled to form an antireflection film having an amorphous structure with a thickness of 3 to 250 nm to obtain a screen ridge Fa. When zinc, nickel, chrome, silicon or the like is used instead of titanium for the left and right targets 41, an antireflection film made of the oxide can be obtained. When nitrogen gas is used instead of oxygen gas, an antireflection film made of nitride can be obtained. Further, when methane gas is used instead of oxygen gas, an antireflection film made of carbide is obtained. Further, when magnesium fluoride is used instead of titanium of the target 41, and the use of oxygen gas is stopped and sputtering is performed in an atmosphere of argon gas, an antireflection film made of magnesium fluoride is obtained. EXAMPLE Austenitic stainless steel (SUS31
6) A plain mesh of 500 mesh with a wire diameter of 18 μm as a warp and a weft is used, and sputtering is performed on both the front and back surfaces by the method of the fifth embodiment.
A screen for printing was manufactured. Further, in the fifth embodiment, a screen basket of Comparative Example 1 was manufactured in the same manner as in the fifth embodiment except that stainless steel was used as the target and argon gas was used as the atmospheric gas. Further, a plain woven fabric made of the above-described wire was used as it was to obtain a screen wrinkle of Comparative Example 2. The characteristics of these screens are shown in Table 1 below.
Shown in [Table 1] The screen cages of Examples 1 and 2 and Comparative Examples 1 and 2 are each a screen frame (size 320 ×
320 mm), a photosensitive emulsion was applied, and an original mask was adhered to the center (size 100 × 100 mm). Next, ultraviolet rays having a wavelength of 200 to 450 nm were irradiated, developed and subjected to plate making, and UV paste (“ER-70” manufactured by Somare)
B "), glass paste (" ELD-52 "manufactured by Okuno Pharmaceutical Co., Ltd.)
0 ") and silver paste (" LS-50 manufactured by Asahi Chemical Co., Ltd.)
4HC "), a printing test was performed, the weight of the substrate (coated paper) before and after printing was measured, the amount of paste applied was calculated from the difference, and the printing performance was compared with this amount of coating. As the printing machine, a small-sized printing machine (manufactured by Neurong Seimitsu Kogyo Co., Ltd., trade name “LS15GX”) is used.
The squeegee pressure is set to 3.5 kg / cm ² , and the pressing amount (the squeegee head descending distance when the squeegee rubber tip is brought into contact with the printing material and the printing pressure is applied with reference to this position) is set to 0.
3 mm, off-contact (gap between printing plate surface and substrate) to 1.0 mm, squeegee hardness to 70 degrees,
The squeegee angle was set to 75 degrees and the printing speed was set to 100 mm / second. However, Examples 1 and 2 and Comparative Example
The paste coating amount was tested 10 times for each of 1 and 2 , and the arithmetic average was calculated. The results are shown in Table 2 below. [Table 2] As shown in Tables 1 and 2 above, Example 1,
2 has a low reflectance with respect to ultraviolet rays having a wavelength of 360 nm close to the visible light region in particular, so that the average coating amount increases.
Small holes and narrow slits could be formed, and precision printing was possible. On the other hand, Comparative Examples 1 and 2 had a high reflectance, so the average coating amount was small, and the printability was inferior to the examples. [0036] [Effect of the Invention] As described above, printing screen gauze according to the invention, upon photolithography, excellent reproducibility as compared to having neither <br/> an antireflection film, equal to the original plate mask Since a printing plate (screen type) with a pattern is obtained and wettability is good, the permeability of printing ink and the like is improved, and precision printing and precision printing are possible. The reflection prevention film physical vapor
Excellent peeling resistance since it is a film deposition, and because it is intended to limit the reflectivity of the reflection preventing film, plate-making as designed becomes easier.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a printing screen during exposure. FIG. 2 is a cross-sectional view showing the relationship between an original mask and a printing plate. FIG. 3 is a cross-sectional view of the screen bottle according to the embodiment. FIG. 4 is a cross-sectional view illustrating an example of a sputtering apparatus. FIG. 5 is a cross-sectional view showing another example of the sputtering apparatus. [Explanation of Symbols] L, La: Ultraviolet rays 10: Screen ridge, 10a: Warp 11: Photosensitive layer 12: Original plate mask, 12a: Transparent portion, 12b: Shadow portion 13: Printing plate (screen type), 13a: Hole 15: Screen scissors 16: warp 17: wefts 16a, 17a: antireflection film F: screen curl original fabric (saddle-shaped woven fabric) Fa: screen scissors 20, 30: chamber 21, 41: targets 22, 39, 40: target Sources 23, 37, 38: Anodes 24, 31, 32: Water-cooled cylinders 25, 33: Delivery shafts 26, 34: Winding shafts 27a, 27b, 35a-35f: Guide rollers 28: Vacuum pumps 29a, 29b: Gas cylinders E : DC power supply

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideaki Nakajima 36, Hamamachi, Gamagori City, Aichi Prefecture Suzuuchi, Inc. (72) Inventor Toshikazu Suzuki 36, Hamacho, Gamagori, Aichi Prefecture (72) Inventor, Suzuya Takahiro Suzuki 36 Hamamachi, Gamagori-shi, Aichi Pref. Suzuyo, Inc. (72) Inventor Toru Yokomizo 3-50, Toyota, Hino-shi, Tokyo 3 NBC Industrial Co., Ltd. (72) Inventor Hiroshi Otaka 3N-50, Toyoda, 2-chome, Hino-shi, Tokyo, Japan (56) References JP 6-219071 (JP, A) JP 9-123631 (JP, A) JP JP 3-236962 (JP, A) JP 6-1089 (JP, A) ACT 59-169966 (JP, U) ACT 62-28567 (JP, U) (58) Fields surveyed (Int .Cl. ⁷ , DB name) B41N 1/24

Claims (1)

(57) [Claims] [Claim 1] At least one side of a cocoon-shaped woven fabric using a thin stainless steel wire for warp and weft is made of metal oxide, nitride or carbide or magnesium fluoride. made is coated with an antireflection film of the ultraviolet, the
The antireflection film is a physical vapor deposition film having a thickness of 3 to 250 nm,
The reflectivity for ultraviolet light with a wavelength of 250 to 450 nm is 15
% Or less, printing screen gauze transmittance characterized der Rukoto 45% or more.