JP3673494B2 - Mesh fabric for screen printing and screen plate using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention eliminates mechanical background mismatch used in precision parts such as electronic parts, printed circuits, and IC circuits, precision printed circuit printing, and the like, and structurally strengthened mesh fabric for screen printing, and a screen using the same It is about the edition.
[0002]
[Prior art]
Conventionally, mesh fabrics used for screen printing have been mainly made of chemical fibers such as nylon and polyester. However, as the demand for more complicated printing patterns and higher accuracy has increased, there has been a shift from chemical fibers to dimensional accuracy. Metal fibers such as excellent stainless steel have become the mainstream, and at present, the surface of the metal fibers is plated to improve the dimensional accuracy, for example, JP-A-6-179258 or the purpose of improving printing durability. For example, Japanese Patent Laid-Open No. 2000-177099 has been invented.
In recent years, further miniaturization of electronic components has progressed, and there is an increasing demand for screen patterns with higher definition and thinner printing. On the other hand, a large-sized, high-definition, high-precision screen plate such as electrode formation for a large flat display panel has been required. Further, in any situation, there is a demand for a screen plate having a high printing durability with a long-term dimension stability.
[0003]
[Problems to be solved by the invention]
However, in the above prior art, there is a limit to printing thinly to coat the mesh fabric, and in terms of long-term dimensional stability, the phenomenon that the pattern gradually deforms as it is printed appears. It has become difficult to fully satisfy.
[0004]
In view of such circumstances, the present invention is either wet or dry for mesh fabrics adjusted for mechanical background mismatch of mesh fabrics formed by braiding metal fibers that function as printing pattern supports in screen plates. The purpose is to provide a mesh fabric for screen printing that is structurally reinforced and a screen plate using the same, by eliminating the mechanical background mismatch by metal-coating the entire surface and fixing the braided part. is there.
[0005]
[Means for Solving the Problems]
The present invention is intended to solve the above-described problems, and employs the following technical means.
According to the first aspect of the present invention, the mesh fabric formed by braiding metal fibers functioning as a printed pattern support in the screen plate is subjected to mechanical analysis in the longitudinal direction and the weft direction based on a load-elongation diagram by a tensile test. It is said that a single mesh fabric with adjusted background mismatch is covered with metal, regardless of whether wet or dry, and the mechanical background mismatch is eliminated by fixing the braided portion, strengthening the structure. Adopted technical means.
[0006]
The invention described in claim 2 employs a technical means called a screen plate using a mesh fabric for screen printing, which eliminates the mechanical background mismatch in claim 1 and is structurally reinforced.
[0007]
In the invention described in claim 3, printing made of stretchable woven fabric, film, sheet or the like on the outer periphery of the mesh fabric for screen printing that has solved the mechanical background mismatch in claim 1 and is structurally reinforced. A technical means called a combination screen plate for screen printing in which a load buffer is provided and stretched on the frame was adopted.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
One of the methods for displaying the mechanical properties of the mesh fabric used in the screen plate is a load-elongation diagram. This is a diagram obtained by a tensile test specified in JIS-L1096-1990 (General Textile Test Method), where the vertical axis represents the load value and the horizontal axis represents the elongation. That is, it is a curve representing the relationship between the load applied to the test piece and the elongation accompanying it in all the steps of the tensile test.
This load-elongation diagram is very important data as one method for selecting a mesh fabric for a screen plate. This is because, in the load-elongation diagram, a mesh fabric with high load and low elongation can be expected to have high accuracy and high printing durability.
[0009]
Mesh fabrics for screen printing can be broadly divided into those woven with chemical fibers such as polyester and those woven from metal fibers such as stainless steel. The mesh fabric for screen printing used for printing durability is generally made of metal fibers with high load and low elongation.
[0010]
However, a mesh fabric formed by braiding metal fibers has a direction in the weaving of the fibers. This depends on the manufacturing method of the mesh fabric by the loom and the hardness of the metal material. A mesh fabric generally used for screen printing has a structure in which wefts are woven into warps. Therefore, a mesh fabric made of braided metal fibers weaves in a state where the warp and weft are bent differently, and therefore shows different load-elongation diagrams in the warp and weft directions. That is, the warp direction / weft direction load-elongation diagram of a mesh fabric made of braided metal fibers is mechanically mismatched.
[0011]
As described above, when a mesh fabric in a mechanically weft mismatched state in which the balance between the warp and the weft is lost is used for the screen plate, the dimensional accuracy gradually deteriorates. In recent years, in order to prevent moiré and to stably print various pattern shapes, a bias tension method in which a mesh fabric is stretched obliquely at an angle is generally used. As the number of times of printing on the printing plate increases, the pattern of the printed matter is inclined in the bias direction or bias + 90 °, and the pattern is deformed.
[0012]
In the present invention, after adjusting the mechanical background mismatch of the mesh fabric formed by braiding metal fibers, the mesh fabric was coated on the entire surface to eliminate the mechanical background mismatch. By producing a screen plate using a mesh fabric with the same or approximated load-elongation line, it is possible to provide a screen plate with high accuracy and high printing durability without pattern deformation. .
[0013]
Various methods can be used to adjust the mechanical background mismatch of the mesh fabric made of braided metal fibers. As one of the methods, the mechanical background mismatch can be adjusted relatively easily by using a calendar (compressor) to crush the braided portion of the mesh fabric under load.
[0014]
The method of applying a load to the braided portion of the mesh fabric and crushing it is a known method called calendering, but the purpose of the calendering is not to adjust the mechanical background mismatch, just to apply ink. This is a method that has been used to reduce the thickness of the mesh fabric in order to reduce the amount, that is, to print the ink thinly, and is greatly different from the object of the present invention.
[0015]
In the present invention, processing is performed by applying an arbitrary load to the mesh fabric for the purpose of adjusting the mechanical background mismatch. Since this load slightly varies depending on the wire diameter and the number of meshes of the mesh fabric to be processed, it is necessary to adjust appropriately depending on the mesh fabric to be processed.
[0016]
Although the calendar processing method has been described as an example of the method for adjusting the mechanical background mismatch, any method may be used as long as the mechanical background mismatch can be actually adjusted. If a method other than the calendering method is mentioned, a method of stretching a mesh fabric, a method of using a calendering method and a stretching method in combination, and the like are effective.
[0017]
By covering the entire mesh fabric adjusted for such mechanical background mismatch with Ni plating with an appropriate thickness by, for example, electroplating, and fixing the braided portion, a mesh fabric with high load and low elongation can be obtained. In addition, if the mesh fabric is used for a screen plate, it is possible to obtain a screen plate with high printing durability that does not cause pattern deformation with high accuracy. In addition, by applying a load to the braided portion and then metallizing it, the mesh fabric can be made thinner than the conventional technology, and as a result, the ink can be printed thinner than the conventional one. become. In addition, it cannot be overemphasized that it can select variously, such as not only Ni plating but chromium plating, copper plating, etc. as plating.
[0018]
In addition, although the electroplating method was mentioned as a method of metal coating, any method may be used as long as metal coating is possible on the entire surface of the mesh fabric. Examples of methods other than electroplating include electroless plating for wet methods and PVD, CVD for dry methods.
[0019]
【Example】
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and accuracy experiments.
This experiment is a comparative experiment based on a tensile test for comparing the prior art and the present invention. All comparative experiments were performed under the conditions of a grip length of 200 mm, a strip width of 50 mm, and a tensile speed of 100 mm / min. The mesh fabric braided with metal fibers used in the experiment is 400 mesh and the wire diameter is 18 μm.
[0020]
FIG. 1 shows a load-elongation diagram of a mesh fabric in which the warp 2 and the weft 1 are not mechanically aligned, that is, the mechanical weft mismatch is not adjusted. FIG. Fig. 3 shows a load-elongation diagram of a mesh fabric coated with Ni plating with a thickness of 1 μm on a non-woven mesh fabric, and Fig. 3 shows a mesh with Ni plating coated with a thickness of 3 µm on a mesh fabric with no mechanical background mismatch. Fig. 4 shows the load-elongation diagram of the woven fabric. Fig. 4 shows the mesh woven fabric with the mechanical background mismatch adjusted by reducing the thickness by 18% by the calendering method when the thickness of the mesh woven fabric used in Fig. 1 is 100%. FIG. 5 shows a mesh fabric in which the mechanical background mismatch is adjusted by reducing the thickness by 18% by the calendering method when the thickness of the mesh fabric used in FIG. 1 is 100%. 1 μm thick Fig. 6 shows the load-elongation diagram of the mesh fabric coated with Ni plating. Fig. 6 shows the mechanical history of the mesh fabric used in Fig. 1, with the thickness reduced by 18% by the calendering method when the thickness of the mesh fabric used is 100%. Load-elongation diagram of mesh fabric coated with Ni plating with a thickness of 3μm on mismatched mesh fabric, Fig. 7 is calendered when the thickness of mesh fabric used in Fig. 1 is 100% Fig. 8 shows the load-elongation diagram of a mesh fabric with a mechanical background mismatch adjusted by reducing the thickness by 32% according to the method. Fig. 8 shows the calendering method when the thickness of the mesh fabric used in Fig. 1 is 100%. Fig. 9 is a load-elongation diagram of a mesh fabric coated with Ni plating with a thickness of 1 µm on a mesh fabric whose thickness is reduced by 32% to adjust the mechanical background mismatch. Fig. 9 is a diagram of the mesh fabric used in Fig. 1. The load-elongation diagram of a mesh fabric coated with Ni plating with a thickness of 3 μm on a mesh fabric whose thickness has been reduced by 32% by the calendering method to adjust the mechanical background mismatch. It is.
[0021]
Next, the results will be described in detail.
Generally, the load that the screen plate receives during screen printing is said to be 200 N or less. Therefore, in this experiment, a comparison was made on the locus of the load-elongation diagram up to the upper limit of 200N.
1 to 3 are mesh fabrics without adjusting the mechanical background mismatch. As can be seen from FIG. In FIG. 2, the mesh fabric is coated with 1 μm Ni plating and 3 μm in FIG. 3. From these figures, the load value increases and the elongation tends to decrease as the thickness of the metal coating of the mesh fabric increases. It can be seen that the mechanical background mismatch has not been resolved. FIGS. 1 to 3 show conventional techniques. From these figures, it can be predicted that the conventional techniques will eventually cause pattern deformation in long-term printing.
[0022]
4 to 6 are mesh fabrics in which the mechanical background mismatch is adjusted by reducing the thickness by 18% by a calendering method when the thickness of the mesh fabric of FIG. 1 is 100%. FIG. 4, which is a mesh fabric not coated with Ni plating, FIG. 5, which is a mesh fabric coated with 1 μm Ni plating, is a mesh fabric coated with 3 μm Ni plating, although it is mismatched. In FIG. 6, it can be seen that the background mismatch is resolved.
[0023]
7 to 9 are mesh fabrics in which the mechanical background mismatch is adjusted by reducing the thickness by 32% by a calendering method when the thickness of the mesh fabric of FIG. 1 is 100%. FIG. 7 which is a mesh fabric not coated with Ni plating is mismatched in the background, but FIG. 8 which is coated with Ni plating of 1 μm, and FIG. 9 which is coated with Ni plating of 3 μm is resolved. You can see that.
[0024]
From the above results, it is clear that the mechanical background mismatch of the mesh fabric is not completely eliminated only by crushing the braided portion of the mesh fabric, but can be completely eliminated by performing metal coating with an appropriate thickness. It is also clear that the metal coating can provide a high load and low elongation and structurally strengthen the mesh fabric.
[0025]
In other words, by performing a combined process of adjusting the mechanical background mismatch of the mesh fabric and metal coating, the mechanical background mismatch of the mesh fabric can be eliminated and structurally strengthened.
[0026]
A screen plate with high precision and high printing durability that does not cause pattern deformation if a mesh fabric that is structurally reinforced by eliminating such mechanical background mismatch and applying metal coating is stretched on the frame. Can be provided. Furthermore, since the thickness of the mesh fabric can be reduced, printing can be performed thinner than before.
[0027]
In addition, if the elasticity required for separating the plate at the time of printing is not obtained with the mesh fabric alone, which has become a high load and low elongation by performing metal coating, a stretch fabric on the outer periphery thereof, By providing a print load buffer consisting of film, sheet, etc. and stretching it to the frame, so-called combination, the print load buffer acts as an elastic body, and pattern deformation does not occur, high accuracy and high resistance A printable screen printing plate can be provided. Furthermore, since the thickness of the mesh fabric can be reduced, printing can be performed thinner than before.
[0028]
【The invention's effect】
As a result of employing the above configuration, the present invention can obtain the following effects.
Since the mesh fabric of the present invention is structurally reinforced by eliminating mechanical background mismatch and metallized, the screen pattern using the mesh fabric has a deformed printing pattern even after long-term use. Does not have stable printing accuracy. Also, by adjusting the mechanical background mismatch, the thickness of the mesh fabric can be reduced, so that the ink can be printed thinner than the screen plate using a mesh fabric with only metal coating. It is.
[Brief description of the drawings]
FIG. 1 is a load-elongation diagram of a mesh fabric that is not adjusted for mechanical background mismatch.
FIG. 2 is a load-elongation diagram of a mesh fabric coated with Ni plating with a thickness of 1 μm on a mesh fabric that has not been adjusted for mechanical background mismatch.
FIG. 3 is a load-elongation diagram of a mesh fabric in which a Ni fabric is coated with a thickness of 3 μm on a mesh fabric not adjusted for mechanical background mismatch.
4 is a load-elongation diagram of a mesh fabric in which the mechanical background mismatch is adjusted by reducing the thickness by 18% by a calendering method when the thickness of the mesh fabric used in FIG. 1 is 100%. is there.
FIG. 5 shows that the mesh fabric used in FIG. 1 has a thickness of 1 μm on a mesh fabric whose mechanical background mismatch is adjusted by reducing the thickness by 18% by a calendering method when the thickness of the mesh fabric is 100%. It is a load-elongation diagram of the mesh fabric which coat | covered.
FIG. 6 shows that the mesh fabric used in FIG. 1 has a thickness of 3 μm on a mesh fabric whose mechanical background mismatch is adjusted by reducing the thickness by 18% by a calendering method when the thickness of the mesh fabric is 100%. It is a load-elongation diagram of the mesh fabric which coat | covered.
FIG. 7 is a load-elongation diagram of a mesh fabric in which the mechanical background mismatch is adjusted by reducing the thickness by 32% by a calendering method when the thickness of the mesh fabric used in FIG. 1 is 100%. is there.
FIG. 8 shows that the mesh fabric used in FIG. 1 has a thickness of 1 μm on a mesh fabric whose mechanical background mismatch is adjusted by reducing the thickness by 32% by a calendering method when the thickness of the mesh fabric is 100%. It is a load-elongation diagram of the mesh fabric which coat | covered.
FIG. 9 shows a Ni-plating with a thickness of 3 μm on a mesh fabric whose mechanical background mismatch is adjusted by reducing the thickness by 32% by a calendering method when the thickness of the mesh fabric used in FIG. 1 is 100%. It is a load-elongation diagram of the mesh fabric which coat | covered.
[Explanation of symbols]
1 ... Latitude line 2 ... Meridian

Claims (3)

A mesh fabric made of braided metal fibers that function as a printed pattern support in a screen plate . One mesh with adjusted longitudinal and weft direction mechanical weft mismatches based on a load-elongation diagram in a tensile test. A mesh fabric for screen printing that is structurally reinforced by eliminating the mechanical background mismatch by coating the entire surface of the fabric, whether wet or dry, with metal, and fixing the braid.   A screen plate for screen printing in which a mesh fabric for screen printing, which has solved the mechanical background mismatch in claim 1 and is structurally reinforced, is stretched around a frame.   The frame body is provided with a printing load buffer made of stretchable fabric, film, sheet, etc. on the outer periphery of the mesh fabric for screen printing that has been solved mechanically and is structurally reinforced. A stretched combination screen version for screen printing.

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