JP4773327B2 - Mesh woven fabric, screen printing plate using the mesh woven fabric, and plasma display panel manufacturing method using the screen printing plate - Google Patents

Description

  The present invention relates to a mesh fabric for a screen plate suitable for increasing the coating thickness (to obtain a high film thickness), and to a fabric having a woven structure with reduced squeegee wear. The present invention also relates to a screen printing plate in which such a mesh fabric is stretched. Furthermore, the present invention is also a method for manufacturing a plasma display panel using such a screen printing plate.

Today, when printing using a screen mask, it has been required to increase the film thickness and make the line finer. However, the important factor that determines the finish of printing is the properties of the screen fabric (mesh fabric). The properties that are required for the screen fabric are that the diameter of the wire is small and the opening (opening) is wide so that the influence of the yarn is minimized as much as possible during printing. However, when the wire diameter is reduced, the thickness of the screen fabric is reduced, and there is a problem that an appropriate printed film thickness cannot be obtained. In addition, when trying to increase the thickness of the screen fabric, the wire diameter has to be increased and there is a problem that pinholes are likely to occur. Therefore, in the conventional techniques up to now, some attempts have been made to control the thickness by devising the fabric weaving method, but in any case, since the accuracy of the thickness is low, it cannot be used industrially. It was.
In addition, Patent Document 1 below discloses a similar structure, but depending on the printing direction, the squeegee is heavily worn and is not suitable for mass production.
JP 2003-268649 A

  Furthermore, when the dielectric layer of the plasma display is formed using the screen printing plate in which the mesh fabric described in Patent Document 1 is stretched, a pinhole-like defect occurs on the surface of the dielectric film. In addition, there is a problem that squeegee is significantly deteriorated (weared) when mass production is performed, and an adverse effect due to squeegee wear powder occurs.

Recently, as a screen printing plate capable of reducing the frequency of occurrence of mesh breakage, the following Patent Document 2 discloses that the weft yarn diameter is larger than the warp yarn diameter, and the weft yarn wavy width is the warp yarn corrugation. A fabric in which a mesh fabric larger than the width is stretched is disclosed.
JP 2005-313556 A

  However, when the mesh fabric described in Patent Document 2 is structured with chemical fiber yarns such as polyester and nylon, the fibers are flexible and therefore have low hardness. At the intersection of the warp and weft, the yarn is crushed and deformed, so that the thickness of the fabric cannot be maintained, and only a thickness less than twice the wire diameter can be obtained. In addition, by increasing the thickness of the thread in contact with the substrate, the bending of the standard thickness yarn (the yarn with the smaller wire diameter) increases, and as a result, the standard thickness yarn touches the substrate. Therefore, there is a problem that the wear resistance is not good. And when such a mesh fabric is organized by metal yarn, a large coating thickness is obtained by reducing deformation at the intersection of the yarns during screen printing, and the durability of the mesh fabric is improved. The squeegee of the machine is greatly worn, and there is a problem that the squeegee must be changed frequently in order to obtain a product with a stable coating thickness.

The present invention uses metal yarns having specific strengths for the warp and weft, respectively, so that the pitch of the weft satisfies a specific relationship with the mesh fabric thickness (紗 thickness), the weft wire diameter, and the warp wire diameter. Therefore, it is suitable for obtaining a larger printed film thickness than the screen fabric described in Patent Document 1, and described in Patent Document 2 while maintaining a woven structure in which pinholes are unlikely to occur during printing. It is an object of the present invention to provide a mesh fabric for a screen printing plate having a feature of extremely reducing squeegee wear as compared with the screen fabric of the present invention.
As a result of various studies, the inventors have found that the amount of squeegee wear increases rapidly when the weft pitch is equivalent to the thickness of the woof. As a means for solving this problem, the warp and weft have specific strengths. By using the made metal thread and making the weft pitch more than thick, the contact angle between the warp and the squeegee is increased, and the wear amount of the squeegee is reduced without the point of the warp crest being sharp. The upper limit of the weft pitch is that the weft yarn diameter (μm) +160 μm is optimal so that the paste-like ink does not pass through the mesh fabric and drop onto the printing surface during printing, and the thickness of the mesh fabric. The optimum range of D was found to be 2.0d1 to 2.4d1, and the present invention was completed.

The mesh fabric of the present invention for solving the above problems is a metal mesh fabric stretched and used on a frame of a screen printing plate, and the mesh fabric has a wire diameter of d1 and strength. It is composed of a metal warp having a diameter of 600 to 1500 N / mm ² and a metal weft having a wire diameter of d2 and a strength of 1000 N / mm ² or more. The strength of the metal weft is higher than the strength of the metal warp The line length d1 and the line length d2 are d1> d2 and the pitch of the metal weft is a mesh fabric thickness D to 160 + d2 expressed in microns, and the mesh fabric thickness D is 2.0d1 to 2.4d1.

The present invention is also characterized in that in the mesh fabric having the above characteristics, the metal weft has a strength of 1000 to 3500 N / mm ² and the wire diameter d1 or d2 is 10 to 80 μm. But there is.

  Furthermore, the present invention is also a screen printing plate in which the above-described metal mesh fabric is stretched in a frame.

  The method for producing a plasma display panel of the present invention includes a step of forming a conductive layer and a dielectric layer covering the conductive layer on at least one glass substrate, and at least one of the conductive layer and the dielectric layer. The step of forming these is a step of a screen printing method using the above-described screen printing plate.

In the case of using a screen printing plate in which the mesh fabric of the present invention is stretched, the coating thickness can be increased, the occurrence of pinholes can be reduced, and squeegee wear is reduced. The advantage is obtained.
In addition, according to the screen plate of the present invention, the dielectric of the plasma display can be formed with a smaller number of printings than before, and without deterioration of the surface roughness, and even in mass production, Deterioration of squeegee etc. can be greatly suppressed, and generation of squeegee wear powder is also suppressed, so there is no occurrence of pinhole-like defects on the dielectric film surface, and the dielectric has excellent reliability The layer can be produced stably and is extremely useful in industry.

Hereinafter, the mesh fabric of the present invention will be described. FIG. 1 is a conceptual diagram showing a cross-sectional state of a woven structure in an example of a mesh fabric of the present invention (weft yarn number 150 (weft pitch 169 μm), warp wire diameter 65 μm, weft wire diameter 40 μm, cocoon thickness 140 μm).
As shown in FIG. 1, the mesh fabric of the present invention is composed of a plain weave structure in which warp yarns a and weft yarns b (both of metal yarns) are interlaced alternately one above the other. Compared with the mesh fabric (see FIG. 2), the weft pitch is woven so that the strength of the metal warp a is 600-1500 N / mm ² whereas the strength of the metal weft b is 1000 N / mm ² or more, preferably 1000~3500N / mm ^2, when expressed in microns,
Thickness ≦ Weft pitch ≦ 160 + Weft line system d2
Meet the relationship. Said weft pitch is a numerical value (μm) represented by (25.4 × 10 ³ ) / number of weft meshes.
In the present invention, the lower limit of the weft pitch is the thickness. When the weft pitch is smaller than the thickness, the surface of the mesh fabric is rough, the contact angle between the warp and the squeegee is reduced, and screen printing is performed. This is because the wear amount of the squeegee at the time increases and the coating thickness varies and the production stability decreases. Conversely, when the weft pitch exceeds 160 + weft line system d2, a large printing thickness is required. This is because it becomes impossible to obtain the ink, and the problem arises that the paste-like ink passes through the mesh fabric and drops onto the printing surface during printing.

Further, in the present invention, a mesh fabric in which the warp wire diameter d1 and the weft wire diameter d2 have a relationship of d1> d2 (for example, a mesh fabric having a warp wire diameter of 60 μm and a weft wire diameter of 55 μm). The preferable wire diameters d1 and d2 are 10 to 80 μm. When both the line diameters are not in this relationship, the wear amount of the squeegee tends to increase.
In the present invention, the relationship between the warp wire diameter d1 and the mesh fabric thickness D is 紗 thickness D = 2.0d1 to 2.4d1, and when the heel thickness D is less than 2.0d1, a squeegee is used. However, when the thickness D exceeds 2.4d1, the wear amount of the squeegee tends to increase.

The metallic warp a which constitute the mesh fabric of the present invention, strength 600~1500N / mm ^2, preferably of 800~1500N / mm ^2, both those that are used to weave a normal mesh fabrics can be used However, the metal weft b has a strength of 1000 N / mm ² or more (preferably 1300 to 3500 N / mm ² ). It is preferable that the strength of the metal weft b is greater than the strength of the metal warp a. By producing a mesh fabric under these conditions, it is possible to obtain a mesh fabric having a desired thickness. In addition, about the intensity | strength of the thread | yarn which comprises a mesh fabric, the design value is shown (hereinafter the same), and about 10% of the actual value will produce an error with respect to this design value. If it exists, it can become the structure of this invention.
By the way, the material of the metal warp a and the weft b in the present invention is not particularly limited, and various metal materials constituting the metal mesh used in the screen printing plate, such as stainless steel, nickel, nickel alloy, titanium, titanium, and the like. Alloys, copper, and the like can be used, but stainless steel is preferred. The materials of the warp and weft are generally the same, but are not limited to the same material as long as the strength of each yarn satisfies the above-mentioned conditions.

Next, the screen printing plate of the present invention in which the mesh fabric is stretched in the frame will be described.
In the conventional mesh fabric shown in FIG. 3, the weft yarns b are alternately displaced in the vertical direction (the front and back surfaces of the fabric), and both the warp yarns a and the weft yarns b are printed during screen printing on a substrate having a flat surface. However, in the case of the screen printing plate described in Patent Document 1, the weft yarn b is located substantially on the same plane, and the curvature of the metal warp yarn a is higher than that of the conventional product (see FIG. 2). ), And the weft b does not come into contact with the substrate. With such a cross-sectional structure, the area where the mesh fabric comes into contact with the printing material is reduced, and the applied ink or paste is sufficiently filled to the lower side of the mesh fabric, resulting in a higher printed film thickness than the conventional product. As a result, there is an advantage that the rate of occurrence of pinholes during printing is reduced. However, in the case of the mesh fabric as shown in FIG. 2, it has been found that the frictional force with the squeegee is remarkably increased due to the high curvature of the warp yarn, and the squeegee wears heavily and is not suitable for mass production printing. In the present invention, an advantage that wear of a squeegee at the time of printing can be reduced is obtained by using a woven structure in which the thickness, the weft pitch, and the weft wire diameter satisfy a specific relational expression.

  Further, in the case of the conventional mesh fabric as shown in FIG. 3, when affected by the unevenness of the lower layer during printing, the grid corresponding to the surface of the mesh fabric has interference fringes between the lower layer and uniform. However, in the case of the screen printing plate of the present invention, the area of the mesh fabric contacted with the printing material is reduced, so that the smoothness of the surface of the printed material is increased, and the multilayer printing is performed. Occasionally, the influence of the unevenness of the lower layer is reduced, and the generation of interference fringes can be prevented.

Next, the structure of the plasma display panel produced using the screen printing plate of the present invention will be described. For example, as shown in FIG. 7, a plasma display panel used in a thin display device includes a glass front substrate 2 and a rear surface, which are two substrates disposed to face each other so as to form a discharge space 1 therebetween. And a substrate 3. A plurality of display electrode pairs composed of two display electrodes 4 and 5 are arranged on the front substrate 2, and a light shielding layer (black stripe) 6 is formed between the display electrode pairs. A dielectric layer 7 is formed so as to cover the display electrodes 4 and 5 and the light shielding layer 6, and a protective layer 8 made of magnesium oxide is formed on the dielectric layer 7. The display electrodes 4 and 5 include a transparent electrode 9 made of indium tin oxide (ITO) or the like and a bus electrode 10 made of silver or the like formed thereon.
A plurality of address electrodes 11 are formed on the back substrate 3 in a direction orthogonal to the display electrodes 4 and 5, and a dielectric layer 12 is formed so as to cover the address electrodes 11. A partition wall 13 is formed on the dielectric layer 12 so as to be positioned between the address electrodes 11, and a phosphor layer 14 is formed on the surface of the dielectric layer 12 and the side surface of the partition wall 13.
In the discharge space 1, for example, a discharge gas made of a mixed gas of neon and xenon is sealed at a pressure of 400 to 600 Torr. The phosphor layer 14 emits light by ultraviolet rays generated when a display discharge is caused between the display electrode 4 and the display electrode 5 constituting the display electrode pair to display a color image.

By the way, when the light shielding layer 6, the dielectric layer 7 or the bus electrode 10 is formed on the front substrate 2, and when the address electrode 11, the dielectric layer 12, the partition wall 13 or the phosphor layer 14 is formed on the rear substrate 3. There is a screen printing method. A conventional screen printing method will be described below with reference to FIG.
As shown in FIG. 8 (a), a substrate is placed on a screen plate 17 formed by stretching a screen 16 in which fine wires made of metal are formed in a mesh shape in a square plate frame 15 with high tension. The printing paste 20 is applied on the screen 16 by moving the scraper 19 in the direction of the arrow. Thereby, the printing paste 20 is filled in the opening of the screen 16. The scraper 19 is composed of a single plate-like blade having a straight tip that is applied to the screen 16.
Next, as shown in FIG. 8B, after the substrate 21 is placed on the printing stage 18, the screen plate 17 is aligned with the substrate 21 and brought close to a predetermined position, and the urethane squeegee 22 is moved. The printing paste filled in the openings of the screen 16 is transferred onto the substrate 21 by being moved in the direction of the arrow while being pressed against the screen 16. Thus, the printing paste layer 23 is formed on the substrate 21 and screen printing is performed.
The method for producing a plasma display panel of the present invention includes a step of forming a conductive layer and a dielectric layer covering the conductive layer on at least one glass substrate, and at least one of the conductive layer and the dielectric layer. When forming these, screen printing using the above-described screen printing plate of the present invention is performed.
In the case of the plasma display panel manufacturing method of the present invention, i) it is suitable for mass production because there is little wear on the squeegee, and ii) it is possible to prevent quality deterioration of the formation site due to worn squeegee pieces (dust). As a result, it is possible to effectively prevent the occurrence of melting destruction, dielectric breakdown, partition wall chipping, and the like due to power concentration.
Hereinafter, the present invention will be described in more detail by showing the results of a printing test performed using a screen printing plate in which the mesh fabric of the present invention is stretched and a screen printing plate in which a conventional mesh fabric is stretched. The present invention is not limited to these examples.

(Example of production of the mesh fabric of the present invention)
Wire diameter at 65 .mu.m, using stainless steel yarn strength is 800 N / mm ² a (SUS304) as a warp, in wire diameter 40 [mu] m, stainless steel yarn strength is 2700N / mm ² (the hard-line degree SUS) as a weft A mesh fabric of the present invention having a plain weave structure having a cross-sectional state similar to that of FIG. 1 and having a mesh number of 150 (pitch: 169 μm), a collar thickness of 140 μm, and a collar thickness D = 2.15d1 was produced.

(Squeegee wear test)
As the product of the present invention, the mesh fabric (weft pitch 169 μm, cocoon thickness 140 μm, warp wire diameter 65 μm, weft wire diameter 40 μm) was used.
As the conventional comparative product 1, using diameter 40 [mu] m, a stainless steel yarn is the intensity 1000 N / mm ² as the warp, with diameter 40 [mu] m, a stainless steel yarn is the intensity 2500N / mm ² as a weft, the number of meshes A mesh fabric (mesh fabric described in Patent Document 1) of 200 (pitch 127 μm), collar thickness 99 μm, collar thickness D = 2.48d1 was prepared.
Furthermore, conventional comparative product 2, wire diameter 34 .mu.m, with a stainless steel thread is the intensity 1000 N / mm ² as the warp, with diameter 28 .mu.m, a stainless steel yarn is the intensity 2500N / mm ² as a weft, the number of meshes A mesh fabric (mesh fabric described in Patent Document 2) of 325 (pitch 78 μm), collar thickness 80 μm, collar thickness D = 2.35d1 was prepared.

Screen printing was performed using the above-described product of the present invention, the conventional comparative product 1 and the conventional comparative product 2 to examine the degree of wear of the squeegee.
Plate making conditions Printing conditions Using an automatic printing machine (LS-150 manufactured by Neurong Seimitsu Kogyo), applying a squeegee pressure of ² Kg / cm ² , printing at a speed of 150 mm / sec, and observing the degree of wear of the squeegee after 300 shots did. The squeegee sliding direction was the warp direction of the plate making.
In addition, as a printing paste, a commercially available high-viscosity Ag paste (a paste containing an Ag filler) was used.

2. Experimental Results When the squeegee edge after 300 shots was enlarged and observed, it was found that the product of the present invention had less wear on the squeegee than the conventional comparative product 1 and the conventional comparative product 2.
4 is a photomicrograph showing the state of the squeegee edge before printing, FIG. 5 is a photomicrograph showing the state of the squeegee edge of the product of the present invention after 300 shots, and FIG. 6 is a conventional photograph after 300 shots. 3 is a photomicrograph showing the state of a squeegee edge of Comparative Product 1. The wear state of the squeegee edge after 300 shots for the conventional comparative product 2 was the same as that of the conventional comparative product 1.

(Production example of plasma display panel using screen printing plate according to the present invention)
As the screen printing plate according to the present invention (as shown in FIG. 1), the mesh fabric having the above-mentioned 150 mesh (weft pitch 169 μm), warp d1 of 65 μm, weft d2 of 40 μm and cocoon thickness of 140 μm was stretched. The dielectric layer 7 on the front substrate 2 of the plasma display panel was formed by printing. A dielectric paste having a viscosity of 50 Pa · s was printed using the screen, and after taking a sufficient leveling time and dried, the dry film thickness was about 27 μm. The squeegee sliding direction was the warp direction of the plate making.
When the same operation was repeated a total of 3 times and then baked at 570 ° C., the dielectric layer 7 having a thickness of about 40 μm could be obtained. The dielectric material preferably has a material composition not containing a lead component such as zinc oxide (ZnO), boron oxide (B ₂ O ₃ ), silicon oxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), etc. There is no particular limitation on the content of the composition.
Although 5000 sheets were produced under the same conditions, a film having no film defects such as pinholes in the dielectric and a good surface roughness was obtained.

(Comparative Production Example 1)
On the other hand, when the same dielectric paste was printed on a stainless steel 200 mesh (weft pitch 127 μm) screen, the dry film thickness was about 13 μm. When this printing and drying was repeated a total of 6 times and then baked at 570 ° C., a dielectric layer 7 having a thickness of about 40 μm could be obtained.
However, repeating printing and drying as many as 6 times is not desirable because it causes an increase in cost industrially, and the surface roughness of the fired film surface is rough.

(Comparative Production Example 2)
Further, the screen (3D specification) described in Patent Document 1, specifically, a screen having 200 mesh (weft pitch 127 μm), warp and weft 50 μm, and a cocoon thickness of about 145 μm, is the same dielectric. When the paste was printed, the dry film thickness was about 27 μm. When the same operation was repeated a total of 3 times and then baked at 570 ° C., the dielectric layer 7 having a thickness of about 40 μm could be obtained.
When continuous production was carried out using this screen, the products at the beginning of printing had no film defects such as pinholes in the dielectric, and the surface roughness was relatively good. The surface of the body film had a relatively good surface roughness, but a large number of crater-like pinholes randomly generated after the gas escaped, and the panel quality was poor.
This is because in the case of the screen described in Patent Document 1 (the above-mentioned conventional comparative product 1), the warp yarn undulates on the saw and the warp portion is relatively thin compared to a normal screen, and the screen is just like a sawtooth. By performing the role, the squeegee wears, and the wear powder of the squeegee is mixed with the dielectric paste, so that a squeegee wear is formed in the dry coating film of the dielectric. It is presumed that crater-like pinholes were generated on the dielectric surface by gasification.
Further, the same experiment was conducted on the mesh fabric described in Patent Document 2 (the above-mentioned conventional comparative product 2). As a result, the product in the initial stage of printing had no film defects such as pinholes in the dielectric. Although the surface roughness was relatively good, the surface of the dielectric film after the production of 5000 sheets had a relatively good surface roughness, but the crater-like pinholes after the gas escaped randomly Many occurred and the panel quality was poor. About such a result, the cause similar to the said conventional comparative product 1 can be considered.

Comparative experiment 1: Relationship between the thickness D and the amount of wear of the squeegee Experimental conditions A screen plate was produced in which the warp wire diameter was 60 μm, the weft wire diameter was 45 to 55 μm, the weft pitch was 169 μm, and the thickness was changed from 135 to 155 μm. Using the printing machine shown in the printing conditions, the amount of squeegee wear after 300 printings was measured. In the measurement method, the wear amount was calculated by comparing an image before use and an image after use with a digital microscope. The average value of the center of the squeegee and the three left and right end portions was taken as the amount of wear. The result is shown in FIG.
From the experimental results shown in FIG. 9, it was found that when the warp wire diameter is 60 μm, the squeegee wear increases when the thickness is 145 μm or more, and the printed film has many defects. Further, when the surface of the printed coating film with a squeegee after 300 printings was observed, it was found that if the wear amount exceeded 0.005, pinhole-shaped defects increased on the surface of the printed film (pins on the printed film surface). The amount of squeegee wear that does not increase the number of hole-like defects was 0.005 or less).

Similarly, an experiment was conducted by producing a screen plate in which the warp line warp was 65 μm, the weft line warp was 45 to 55 μm, the weft pitch was 156 μm, and the thickness was changed to 144 to 164 μm (other conditions were the same as above). The result is shown in FIG.
From the experimental results shown in FIG. 10, it was found that the screen plate having a warp thickness of 156 μm or less at a warp yarn warp of 65 μm satisfies the same wear limit of 0.005 or less.
From the above experimental results, it was confirmed that the wear amount of the squeegee can be kept low by satisfying 2.4 * warp warp d1 ≧ thickness D. On the other hand, in the case of a screen plate having a cocoon thickness of less than 2.0 * warp yarn warp d1, the coating thickness was insufficient.

Comparative Experiment 2: Relationship between Weft Yarn Pitch and Amount of Wear Experimental Conditions Thickness 140 ± 3 μm, warp line warp 60 μm, weft line warp 55 μm, and weft pitch changed from 110 to 175 μm. The amount of wear was measured. Other conditions were the same as those in Comparative Experiment 1. The result is shown in FIG.
From the experimental results shown in FIG. 11, it was found that under these conditions, the weft yarn pitch was 141 μm or more and the product was non-defective.
Similarly, an experiment was conducted on a screen with a ridge thickness of 155 ± 3 μm (other conditions are the same as above). The result is shown in FIG.
From the experimental results shown in FIG. 12, it was found that a screen printing plate having a weft pitch equal to or greater than the thickness is what satisfies the wear amount of 0.005 or less, which is also a non-defective product limit.

From these experimental results, it is considered that the amount of wear of the squeegee can be kept low by satisfying the weft pitch ≧ the thickness D. This consideration is based on the following phenomenon. That is, as the weft pitch becomes shorter, the angle at which the warp and squeegee come into contact with each other becomes smaller. When this angle exceeds a certain amount, the amount of wear on the squeegee increases rapidly, and the amount of wear on this squeegee increases rapidly. It is presumed that the angle at which the weft is a case where the weft pitch corresponds to the thickness.
On the other hand, when the distance between adjacent wefts exceeds 160 μm, the paste passes through the mesh fabric during printing, and from these experimental results, the weft pitch is in the following relationship, the effect of the present invention is Played.
Thickness D ≦ Weft pitch ≦ 160 + Weft line warp d2
Moreover, even if the thickness D shown in the comparative experiment 1 is a thickness in a range where the wear amount of the squeegee where the thickness D> 2.4 * warp yarn warp d1 is large, the condition of the comparative experiment 2 is satisfied. It was confirmed that the amount of wear of the squeegee tends to be reduced by satisfying the above.

In the mesh fabric of the present invention, metal yarns having specific strengths are used for the warp and the weft, respectively, and the weft pitch is not less than the thickness of the warp, so that the crest of the warp does not become sharp. The amount of wear of the squeegee during screen printing is small, and the occurrence of pinhole-like defects on the surface of the printed film is small.
Accordingly, the screen printing plate in which the mesh fabric of the present invention is stretched is suitable for mass production of printed matter with a high film thickness because of less abrasion of the squeegee, and in particular, a dielectric layer or a conductive layer of a plasma display panel. Suitable for forming.

It is a figure which shows the cross-sectional state of the woven structure in an example of the mesh fabric of this invention. It is a figure which shows the cross-sectional state of the woven structure in the conventional mesh fabric described in the said patent document 1. FIG. It is a figure which shows the cross-sectional state of the woven structure in the conventional mesh fabric (commercially available stainless steel mesh). It is a microscope picture which shows the state of the squeegee edge before printing. It is a microscope picture which shows the state of the squeegee edge after printing using the mesh fabric of this invention product. It is a microscope picture which shows the state of the squeegee edge after printing using the mesh fabric of the comparative product 1 conventionally. It is a figure which shows the structure of the plasma display panel manufactured using the screen printing plate of this invention. (A) And (b) is a figure which shows the process in the conventional screen printing method. It is a graph which shows the relationship between the heel thickness D and the amount of wear of a squeegee in the screen plate in which the warp wire diameter is 60 μm, the weft wire diameter is 45 to 55 μm, the weft pitch is 169 μm, and the heel thickness is changed from 135 to 155 μm. It is a graph which shows the relationship between the thickness D and the amount of wear of a squeegee in the screen plate which changed the warp line warp 65 micrometers, the weft line diameter 45-55 micrometers, the weft pitch 156 micrometers, and the thickness of the thread thickness 144-164 micrometers. It is a graph which shows the relationship between the weft pitch and the amount of wear of a squeegee when changing the thickness 140 ± 3 μm, the warp line warp 60 μm, the weft line warp 55 μm, and the weft pitch 110 to 175 μm. It is a graph which shows the relationship between the weft pitch and the amount of wear of a squeegee when changing the thickness 155 ± 3 μm, the warp line warp 60 μm, the weft line warp 55 μm, and the weft pitch 127 to 212 μm.

Claims (4)

A metal mesh fabric used by being stretched on a frame of a screen printing plate, the mesh fabric comprising a metal warp having a wire diameter d1 and a strength of 600-1500 N / mm ² , and a wire diameter Is a metal weft having a strength of 1000 N / mm ² or more, and the strength of the metal weft is greater than the strength of the metal warp, and the line diameter d1 and the line diameter d2 are d1> d2 And the pitch of the metal weft is in the range of thickness D to 160 + d2 of the mesh fabric expressed in microns, and the thickness D of the mesh fabric is in the range of 2.0d1 to 2.4d1. Mesh fabric characterized by The mesh fabric according to claim 1, wherein the metal weft has a strength of 1000 to 3500 N / mm ² and the wire diameter d1 or d2 is 10 to 80 µm. A screen printing plate comprising a metal mesh fabric stretched in a frame, wherein the mesh fabric is the mesh fabric according to claim 1 or 2. The step of forming a conductive layer and a dielectric layer covering the conductive layer on at least one glass substrate, and the step of forming at least one of the conductive layer or the dielectric layer is according to claim 3. A method for producing a plasma display panel, which is a step of a screen printing method using a screen printing plate.