JP2003268649A - Mesh textile and screen printing plate using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mesh textile for screen printing plates, which has a knitting structure suitable for obtaining a larger printing thickness and scarcely happening pin holes in printing. <P>SOLUTION: The mesh textile comprises a metal warp (a) having diameter d<SB>1</SB>, strength 600-1,500 N/mm<SP>2</SP>and a metal weft (b) having diameter d<SB>2</SB>, strength ≥1,000 N/mm<SP>2</SP>which is larger than the strength of the warp (a) by ≥200 N/mm<SP>2</SP>, and the diameters d<SB>1</SB>and d<SB>2</SB>are substantially same and the wefts are knitted in a state substantially located in a same plane in a linear state without waving, and the thickness of the mesh textile is 2.4 d<SB>1</SB>-3.0 d<SB>1</SB>. Preferably, the strength of the warp is 800-1500 N/mm<SP>2</SP>, the strength of the weft is 1300-3000 N/mm<SP>2</SP>, and the diameters d<SB>1</SB>and d<SB>2</SB>are 13-40 μm. The screen printing plate comprises the mesh textile spun in a frame. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mesh fabric for a screen plate suitable for increasing the coating thickness (obtaining a high film thickness). The present invention also relates to a screen printing plate formed by stretching such a mesh fabric.

[0002]

2. Description of the Related Art Today, when printing using a screen mask, it is required to increase the film thickness and the fine line, but the important factors that determine the finish of printing are
The properties that are closely related to the properties of the screen fabric (mesh fabric) are large, and the properties required for the screen fabric are that the diameter of the wire is thin and the opening (opening) is wide so that it is not affected by the threads during printing as much as possible. is there. However, when the wire diameter is reduced, the thickness of the screen fabric becomes thin, an appropriate printed film thickness cannot be obtained, and there is a problem that pinholes are easily generated. Therefore, in the conventional technologies up to now, some attempts have been made to control the thickness by devising the weaving method of the fabric, but in any case, the accuracy of the thickness is low, so that it cannot be industrially used. It was

[0003]

DISCLOSURE OF THE INVENTION The present invention is suitable for obtaining a larger printing film thickness as compared with the conventional screen fabrics, and is for a screen printing plate having a woven structure in which pinholes are less likely to occur during printing. An object is to provide a mesh fabric. As a result of various investigations, the present inventors have used a metal thread having high rigidity (high tensile strength and is difficult to bend) as a weft thread, and disposing such a weft thread on the same plane, and the warp thread is more rigid than the weft thread. By using a small metal thread, the thickness of the fabric can be accurately controlled,
By increasing the bending degree (curvature) of the warp threads compared to the conventional screen fabric, a screen thickness larger than that of the conventional product can be obtained. By using the screen fabric with such a structure, the printed film thickness can be increased. The present invention has been accomplished by discovering that the occurrence rate of pinholes can be reduced and the occurrence rate of pinholes can be reduced.

[0004]

MEANS FOR SOLVING THE PROBLEMS The mesh fabric of the present invention for solving the above problems has a wire diameter of d ₁ and a strength of 6
A metal warp yarn having a diameter of 0 to 1500 N / mm ² , and a metal weft yarn having a wire diameter of d ₂ , a strength of 1000 N / mm ² or more, and a strength at least 200 N / mm ² larger than the strength of the warp yarn. Of the structure in which the wire diameter d ₁ and the wire diameter d ₂ are substantially equal to each other, and the metal weft threads are laid in the same plane in a straight line without being substantially wavy. It is a mesh woven fabric, and the thickness of the mesh woven fabric is in a range of 2.4 d _{1 to} 3.0 d ₁ .

Further, in the present invention, in the mesh fabric having the above characteristics, the strength of the metal warp is 800 to 15
At 00 N / mm ² , the strength of the metal weft thread is 1300 to
3000 N / mm ² and the wire diameters d ₁ and d ₂ are 1
It is also characterized in that it is 3 to 40 μm.

The present invention further relates to the metal mesh weave described above.
Even a screen-printing plate in which objects are stretched inside the frame
In this screen printing plate,
The wire diameter of the metallic warp yarns that compose is d₁ And the strength is 600-1
500 N / mm² And the wire diameter of the metal weft thread is
d₂ And the strength is 1000 N / mm² Above, and the vertical
At least 200 N / mm than the strength of the thread² Great strength
And the wire diameter d ₁ And the wire diameter d₂ And are practical
Equal to, the metal weft thread is straight without substantial waviness.
They are laid in the same plane and woven in a linear state.
The thickness of the mesh fabric is 2.4d₁ ~ 3.0d₁ 
The range is.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The mesh fabric of the present invention will be described below. FIG. 1 is a diagram showing a cross-sectional state of a woven structure in an example of the mesh woven fabric of the present invention (325 mesh, wire diameter 28 μm), and FIG. 2 is a woven structure of a conventional mesh woven fabric (325 mesh, wire diameter 28 μm). It is a figure which shows the cross-section state. 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 are metallic yarns) are alternately crossed while moving up and down one by one. The strength of the warp yarn a is 600 to 15
While it is 00N / mm ^2, at an intensity of metallic weft b is 1000 N / mm ² or more, yet at least 200 N / mm ² larger than than the strength of the warp a, metallic weft b is substantially undulating be A structure in which the thickness of the mesh fabric is increased by arranging the metal warp yarns in a straight line state on the same plane, and by waving the metal warp threads a more than the conventional mesh fabric (see FIG. 2). have. At this time, in order to control the thickness of the mesh fabric more accurately, the strength difference between the warp yarn and the weft yarn should be at least 400 N / m.
It is preferably m ² . In the present specification, "strength" means tensile strength.

In the present invention, the wire diameter d ₁ of the metal warp yarn a and the wire diameter d ₂ of the metal weft yarn b which form the mesh fabric are substantially equal to each other, and generally have the same wire diameter (that is, d ₁ =
d ₂ ) is used, and the preferable wire diameters d ₁ and d ₂ are 14 to
It is 40 μm. The thickness of the mesh fabric of the present invention composed of the warp yarn a and the weft yarn b having the above wire diameter is 2.4 d _{1 to} 3.0 d ₁
And the thickness of a conventional product made of metal yarn of the same strength (rigidity) is usually 2.1 when the wire diameter of the metal yarn is d.
From d to 2.3d, it can be seen that the weft yarns having high strength are arranged on the same plane substantially without waviness, thereby increasing the mesh thickness (FIGS. 1 and 2).
reference). In general, the mesh fabric of the present invention has a thickness of about 1.2 times that of a conventional product having the same number of meshes.

[0009] As the metal warp a which constitute the mesh fabric of the present invention, strength of 600~1500N / mm ^2, preferably those used to weave the 800~1500N / mm ^2, a conventional mesh fabrics either It is also possible to use a metal weft thread b having a strength of 1000 N / mm ² or more (preferably 1300 to 3000 N / mm ² ) and a strength at least 200 N / mm ² higher than that of the warp thread a. The maximum strength is 27
It is possible to use the one having about 00 N / mm ² . By the way, the materials of the metallic warp yarn a and the weft yarn b in the present invention are not particularly limited, and various metal materials constituting the metal mesh used for the screen printing plate, for example, stainless steel,
Nickel, nickel alloys, titanium, titanium alloys, copper and the like can be used, but stainless steel is preferred. The warp threads and the weft threads are generally made of the same material, but are not limited to the same material as long as the strength and difference in strength of the threads satisfy the above-mentioned conditions.

Next, the screen printing plate of the present invention in which the above mesh fabric is stretched in the frame will be described. In the conventional mesh fabric shown in FIG. 2, the weft yarns b are alternately displaced in the vertical direction (front and back directions of the fabric),
Although both the warp yarn a and the weft yarn b are in contact with a substrate having a flat surface during screen printing, in the case of the screen printing plate of the present invention in which the mesh fabric is stretched, the weft yarn b is substantially the same. Located on a plane, the metal warp a has a higher curvature than the conventional product (see FIGS. 1 and 2) and the weft b
Does not come into contact with the material to be printed. With such a cross-sectional structure, in the present invention, the area in which the mesh fabric is in contact with the printing object is small, and the ink or paste to be applied is sufficiently filled to the lower side of the mesh fabric,
Compared with the conventional product, a higher printed film thickness can be obtained, and the advantage that the rate of pinholes during printing is reduced can be obtained.

Further, in the case of the conventional mesh fabric as shown in FIG. 2, when it is affected by the unevenness of the lower layer at the time of printing, the lattice pattern corresponding to the surface of the mesh fabric causes interference fringes with the lower layer. However, in the case of the screen printing plate of the present invention, the area of the mesh fabric that comes into contact with the material to be printed is small, and the smoothness of the surface of the printed material is high. The influence of the unevenness of the lower layer during the multi-layer printing is reduced, and the occurrence of interference fringes can be prevented. The following shows the results of printing tests performed using the screen printing plate stretched with the mesh fabric of the present invention and the conventional screen printing plate stretched with the mesh fabric.

[0012]

Example (Production of mesh fabric of the present invention) Wire diameter is 40
100 μm, 28 μm, 23 μm, 18 μm with strength of 100
0 N / mm ² stainless steel yarn (SUS304) was used as warp yarns, respectively, and the same wire diameter and strength of 2
500 N / mm ² stainless steel yarn (high hardness SU
Each of S) was used as a weft to fabricate a mesh fabric of the present invention having a plain weave design having a cross-sectional state similar to that of FIG. The number of meshes, mesh size, porosity, and mesh thickness of each mesh fabric are shown in Table 1 below. In addition, Table 1 also shows the number of meshes, mesh size, porosity, and mesh thickness of a conventional mesh fabric (commercially available stainless steel mesh) having a cross-sectional state similar to that of FIG.

[0013]

[Table 1]

(Screen printing experiment using the above mesh fabric) Screen printing was performed using each of the above mesh fabrics, and the coating thickness and the pinhole generation rate were examined. 1. Printing conditions Automatic printing machine (LS-34G manufactured by New Long Precision Co., Ltd.
X) is used and a squeegee pressure of ² Kg / cm ² is applied,
By printing at a speed of 300 mm / min and measuring the printed film thickness and the pinhole generation rate (the number of pinholes per unit area) when printing under these conditions at N = 50 and calculating the average value. The products of the present invention and the conventional product having the same number of meshes were compared. A commercially available high-viscosity glass frit (paste containing fine glass beads) was used as the printing paste.

2. Experimental Results As shown in Table 1 above, even if the number of meshes is the same, D / d (value of mesh thickness / wire diameter) of the product of the present invention is larger than that of the conventional product. Regarding the film thickness of the printed coating film printed using, it was possible to obtain a film thickness of about 1.2 times that of the conventional product. The pinhole generation rate was affected by the type of printing ink or paste, but when the above high-viscosity glass frit was used, a reduction of about 20% per unit area was observed. Furthermore, regarding the interference that occurs when multi-layer printing is performed, although this also varies somewhat depending on the type of printing ink or paste, when visually observed, in the case of conventional products, it corresponds to the surface of the mesh fabric. While interference fringes were formed between the lattice and the lower layer, the mesh fabric of the present invention (in the case of the screen printing plate, the area of the mesh fabric that comes into contact with the substrate to be printed becomes small, so that The smoothness was improved, the influence of the unevenness of the lower layer was less likely to occur during multilayer printing, and the generation of interference fringes could be effectively prevented.

[0016]

In the case of the mesh fabric of the present invention, the metal weft yarns are arranged on the same plane in a straight line without substantially waviness, and the metal warp yarns are woven in a state of being greatly wavy and bent. Therefore, it is possible to increase the thickness of the mesh fabric itself without increasing the wire diameter, and by using the screen printing plate of the present invention in which the mesh fabric is stretched, a larger printing than the conventional product can be obtained. The film thickness is obtained. Moreover, in the screen printing plate of the present invention, the woven structure reduces the contact area between the mesh fabric and the material to be printed, which can also reduce the occurrence of pinholes, and the surface smoothness of the printed material. Is higher, the influence of the unevenness of the lower layer is less likely to occur during multilayer printing, and the occurrence of interference fringes can be prevented.

[Brief description of drawings]

FIG. 1 is a view showing a cross-sectional state in an example of a mesh fabric of the present invention (a mesh fabric stretched in a frame of a screen printing plate of the present invention).

FIG. 2 is a diagram showing a cross-sectional state of a conventional mesh fabric.

[Explanation of symbols]

a warp b weft d wire diameter D gauze thickness (mesh thickness)

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hideaki Asada             7-11-9 Sekiyakita, Kashiba City, Nara Prefecture F-term (reference) 2H114 AB04 AB05 DA04 DA76 EA04                       FA02 FA06                 4L048 AA04 AB06 AB10 AB11 AC09                       BA06 DA37

Claims (3)

[Claims] 1. The wire diameter is d ₁ and the strength is 600 to 1500.
N / mm ² metal warp threads and metal weft threads having a wire diameter of d ₂ and a strength of 1000 N / mm ² or more and a strength at least 200 N / mm ² greater than the strength of the warp threads. A mesh fabric having a structure in which the wire diameter d ₁ and the wire diameter d ₂ are substantially equal, and the metal weft yarns are laid out on the same plane in a straight line without substantially waviness. And the thickness of the mesh fabric is in the range of 2.4 d _{1 to} 3.0 d ₁ . 2. The strength of the metallic warp is 800 to 150.
At 0 N / mm ² , the strength of the metal weft thread is 1300 to 3
000 N / mm ² and the wire diameters d ₁ and d ₂ are 13
The mesh fabric according to claim 1, wherein the mesh fabric has a thickness of -40 μm. 3. A screen printing plate comprising a metal mesh fabric stretched in a frame body, wherein the metal warp constituting the mesh fabric has a wire diameter of d ₁ and a strength of 600 to 600.
1500 N / mm ² , the wire diameter of the metallic weft thread is d ₂ , the strength is 1000 N / mm ² or more, and the strength is at least 200 N / mm ² greater than the strength of the warp thread. The wire diameter d ₁ and the wire diameter d ₂ are substantially equal to each other, and the metal weft threads are laid and woven on the same plane in a linear state without substantial waviness, Thickness is 2.4d _{1 to} 3.0d
A screen printing plate characterized by a range of ₁ .