KR101355333B1 - Mesh member for screen printing - Google Patents

Abstract

In the present invention, there is no irregularities on the squeegee contact surface, which is a cause of the difficulty of stretching the paste evenly because the squeegee is likely to be caught, and the screen printing has the uniform strength required as the mesh member and the number of meshes required for high-definition printing. Provide a mesh member. In the mesh member for screen printing of the present invention, by forming a plurality of holes in the rolled metal foil, a large number of openings and lines are produced, and at least one surface constituting the lines is flat and has a thickness of 5 µm or more and 25 µm or less. At the same time, the tensile strength obtained by converting the breaking load N at the time of performing the tensile test per 1 cm of the tensile test piece is 20 N / cm or more, and the number of meshes is 250 (pieces / inch) or more.

Description

Mesh member for screen printing {MESH MEMBER FOR SCREEN PRINTING}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mesh member used for screen printing, and more particularly, to a mesh member for screen printing used to realize high definition screen printing with a thin printing film thickness.

The manufacture of electronic components by screen printing is widely practiced, and is applied to a ceramic capacitor, an IC tag, etc., for example. In recent years, the trend of thinning and high integration of electronic components has demanded that the thickness of printed films be made thinner.

1 is an enlarged explanatory diagram of a part of a printing plate normally used for screen printing. The mesh member (mesh fabric) produced by weaving the fine wire 1 made of metal or polyester is attached to a screen frame (not shown), and then the resin 4 (photosensitive emulsion) is applied to the entire surface, and then a mask is used. Covered. And the printing plate 5 is created by hardening | curing the photosensitive oil agent 4 by exposing only the part which is not printed, and removing the photosensitive oil agent 4 of the part to print. In addition, in the figure, the code | symbol 2 shows the opening part (mesh opening part) of a mesh member.

In screen printing, by moving the squeegee 6, the paste 7 (ink 7) is filled in the mesh opening 2 of the printing pattern portion 3 (see FIG. 1 above), The paste 7 adheres to the printed object 8 (Fig. 2 (a)). After the squeegee 6 passes, the printing plate 5 (see FIG. 1) and the printing object 8 are separated from each other by the tension (tension) of the printing plate, but the paste 7 remains on the printing object 8. Thereby, printing according to the pattern from which the photosensitive oil agent 4 was removed is performed. The paste 7 immediately after printing remains thick in the portion corresponding to the mesh opening 2 and thin in the portion corresponding to the thin wire 1 (Fig. 2 (b)), but the viscosity of the paste 7 It is leveled (leveled) by the surface tension (Fig. 2 (c)). At this time, the paste 7 may spread beyond the mesh opening 2 of the printing plate 5, and diffusion of this paste 7 is called bleeding of printing (indicated by reference numeral 7a in FIG. 2).

The printing film thickness (thickness d1 of the paste 7 applied to the printing object 8) is determined by the thickness of the printing plate 5 and the opening ratio (the total area ratio of the mesh openings 2) of the mesh member. For the same print area,

Print film thickness (µm) = thickness of the printing plate (µm) x opening ratio (%)

It is known that the relationship is established. Since the thickness of the printing plate including the thickness of the photosensitive oil agent 4 cannot be thinner than the thickness of the mesh member, efforts have been made to reduce the thickness of the mesh member in order to obtain a thin printing plate.

Reducing the aperture ratio also leads to thinner printing film thickness, but decreasing the aperture ratio reduces the amount of paste 7 remaining on the object to be printed, resulting in discontinuity of the paste 7 (printing blurring). There is concern. In this regard, the opening ratio of the mesh member needs to ensure a predetermined value or more, and thinning the thickness of the printing plate, that is, thinning the thickness of the mesh member, is the most important requirement for making the thickness of the printing film thin. It is. Table 1 shows the relationship between the calculated print film thickness, the thickness of the mesh member, and the opening ratio when the thickness of the printing plate 5 and the thickness of the mesh member are the same.

In addition, when printing with a narrow print pattern width and a pattern space | interval, bleeding will become large when the quantity of the paste 7 is too large, and it is necessary to suppress the quantity of the paste 7 to a minimum required. From this point of view as well, the thinner the thickness of the printing plate (that is, the thickness of the corresponding mesh member), the higher the printing becomes possible.

The mesh member for screen printing is used to hold the photosensitive emulsion 4 as a flat plate and to reinforce the strength of the photosensitive emulsion 4. Since such a mesh member is generally produced by weaving the fine wire 1 which consists of metal and polyester with a machine, presence of the uneven part in the surface is difficult to avoid. Therefore, since the photosensitive oil agent 4 fixed to the mesh member also has an uneven part on the surface, it is not flat, and since the squeegee 6 tends to be caught, there is a disadvantage that it is difficult to stretch the paste 7 evenly. In addition, when the photosensitive emulsion 4 is applied and exposed to light, the surface of the fine wire 1 reaches the surface and the reflection direction changes, so that the photosensitive emulsion 4 of the pattern portion that is not originally cured is cured, and the width of the printed pattern portion is increased. It may be uneven.

As a mesh member (mesh fabric) formed by weaving the fine wire 1, the thing of the thickness of 30-90 micrometers which woven the wire of 13-40 micrometers diameter is used normally. In order to obtain a thin mesh member, the invention has been made to adopt the thin wire as much as possible. For example, Patent Document 1 proposes a mesh member (metal mesh fabric) produced by weaving an ultrafine wire made of austenitic stainless steel having a wire diameter of 10 to 21 µm or less. However, in a metal mesh fabric having only a fine wire, the thickness of the intersection of the wires is twice as large as the diameter of the fine wire, so that a mesh member having a thickness of less than 20 μm cannot be obtained.

In addition, Patent Document 2 proposes a technique of thinning the thickness of the mesh member by making the intersection of the metal mesh fabric flat by rolling, and chamfering at least a part of the rolling flat by grinding or the like. According to this technique, it is described that the thickness of the mesh member is reduced to 21.8 µm by grinding the mesh member having a thin wire diameter of 18.8 µm and a thickness of 24.5 µm after the rolling process (see Patent Document 2, Example). However, in such a technique, the thin metal wire is also reduced in diameter by polishing (wire diameter after polishing: 18.2 占 퐉). If the polishing is made longer and the thickness of the mesh is made thinner, the strength of the mesh member is insufficient and it cannot be attached to the screen frame. There is a concern. In addition, when the polishing is nonuniform, the reduction in diameter due to polishing proceeds excessively, and a portion having low strength is generated, which may cause the mesh member to break.

On the other hand, for example, Patent Document 3 proposes a method for producing a mesh member for screen printing by depositing nickel in a mesh shape by an electroforming method (electrolytic precipitation). However, the mesh member produced by the electroforming method (hereinafter sometimes referred to as "electro casting mesh") has the following problems as a mesh member to be applied to screen printing with high precision with a thin printing film thickness. have.

In the electroforming method, by applying a voltage in an electrolytic solution (electrolyte bath) containing a metal such as nickel, the metal ions under static charge move to the anode electrode, and the metal ions transferred are deposited (electrodeposited) to form a metal film. This principle is the same as the metal plating widely used. In the electroforming method, an electroforming film having a different thickness can be obtained by adjusting the voltage and time. In the case where the substrate on which the metal on the electrode side is deposited is a flat plate, metal foil is obtained, but electroforming products of various shapes can be obtained by electroforming using a substrate (model) having a desired shape. Electroforming is performed using a substrate having convex portions at regular intervals, and a metal such as nickel is deposited in the gap between the convex portions, and then electrodeposition is stopped on the upper surface or less of the convex portion, whereby a mesh-shaped metal foil having lines and openings is produced. . By peeling this from a board | substrate, the electroforming mesh which has a front part and an opening part can be obtained.

It is known that internal stress remains in the metal film or metal foil produced by the plating method or the electroforming method. This stress is also called residual stress or electrodeposition stress and is considered to have a great influence on the strength of the mesh member and the like. Even in electroforming from the same kind of electroforming bath, a difference occurs in the electrodeposition stress and the strength is also different. Moreover, although nickel may contain cobalt etc. in order to raise the strength of a mesh member, among these alloys, internal electrodeposition stress etc. become a problem, and it is known that intensity | strength for every electroforming mesh differs greatly. In this regard, there is a concern that the variation in strength in the electroforming mesh is large, and that a mesh member having a low strength is partially produced.

Since the electroforming mesh faithfully replicates the shape and surface structure of the substrate, some burrs, damage and cracks generated when the substrate is prepared are also transferred. In other words, when burrs are present on the surface of the substrate, there is also a slight damage or crack that transfers the burrs of the substrate to the electroforming mesh. When such damages or cracks are present in the mesh member, when the mesh member is tensioned, stress concentrates on the stretched portion, and the mesh member is easily damaged. If projections are formed on the surface of the mesh member by transferring damage or cracks on the surface of the substrate, the projections may be removed by repeated contact with the squeegee during printing, resulting in damage or cracks. There is a fear that the mesh member breaks from such damage or cracks.

In addition, since the electroforming mesh needs to peel off the mesh member from the substrate, there is also a drawback that cracks are likely to occur at portions where lines intersect when the mesh member is peeled off from the substrate. In particular, when fabricating a mesh member having a large number of meshes at a thickness of 25 μm or less by electroforming, the line width is narrow and the thickness is thin, so that cracks often occur at the line portion during peeling from the substrate. If the surface of the mesh member is damaged or cracked, stress is concentrated on the damaged or cracked portion when the mesh member is attached or when printing with a squeegee, so that the mesh member may break from the damaged or cracked portion.

As described above, the electroforming mesh may have a small amount of damage or cracks on the surface, or a variation in strength may occur due to electrodeposition stress. That is, in the electroforming mesh, there is a case where a large variation in the strength and a low strength may exist. Therefore, the most strength is achieved by the tension when the mesh member is attached to the screen frame or the force (pulling pressure) that the squeegee presses. Is likely to break from the lower portion.

Japanese Patent No. 3497844 Japanese Patent Application Laid-open No. 2006-326953 Japanese Patent No. 3516882

This invention is made | formed in view of such a situation, The objective is that since it is easy to catch a squeegee, there is no uneven part on the squeegee contact surface which becomes difficult to stretch | paste evenly, and has the uniform strength required as a mesh member, It is to provide a mesh member for screen printing having a mesh number necessary for high-definition printing.

In the mesh member for screen printing according to the present invention, which has solved the above problems, a plurality of openings and lines are produced by forming a plurality of holes in the rolled metal foil, and at least one surface constituting the lines is flat and has a thick thickness. It is 5 micrometers or more and 25 micrometers or less, and the tensile strength which converted the breaking load (N) at the time of a tensile test per width of a tensile test piece is 20 N / cm or more, and the number of meshes is 250 (piece / inch) or more It is characterized by.

As a preferable embodiment in the mesh member for screen printing of this invention, it is formed so that (a) opening ratio may be 25% or more and below the value prescribed | regulated by following formula (1), and (b) the external shape of an opening part expands toward a printing object. The structure of these, etc. are mentioned. In addition, the rolled metal foil which is a raw material of the mesh member for screen printing of the present invention is not particularly limited, but any one of stainless steel, titanium or titanium alloy, nickel or nickel alloy, copper or copper alloy, and aluminum alloy may be mentioned.

[Formula 1]

In addition, in this specification, an opening ratio means the ratio of the total area of an opening with respect to the total area of the mesh member containing an opening.

According to the mesh member for screen printing according to the present invention, since the squeegee is easily caught, there is no uneven portion on the squeegee contact surface that causes the paste to be difficult to stretch evenly, and has the uniform strength required as the mesh member and is required for high-definition printing. The mesh member for screen printing which has the mesh number was realizable.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an enlarged explanatory view of a portion of a printing plate normally used for screen printing;
FIG. 2 is a view for explaining a state of filling of a paste in screen printing in the prior art, in which (a) is a printing state, (b) is immediately after printing, and (c) is a paste flattening state. Indicative drawing.
3 is a view for explaining the state of filling of the paste in screen printing when the mesh member of the present invention is used, (a) is a state of printing, (b) is a state immediately after printing, (c) is A diagram showing a state where the paste is planarized.
4 is a graph showing the relationship between the minimum cross-sectional area (mm 2 / cm) per unit width and the tensile strength (N / cm) per unit width.
5 is a view for explaining the opening shape of a hole;
Fig. 6 is a view for explaining the external appearance of the hole, in which (a) is a normal external appearance, and (b) (c) and (d) each shows an external appearance suitable for the present invention.
FIG. 7 is a drawing substitute photograph showing the shape of a mesh member obtained in Example 1. FIG.
8 is a drawing substitute photograph showing the shape of a mesh member obtained in Example 2. FIG.
9 is a drawing substitute photograph showing the shape of a mesh member obtained in Example 3. FIG.
The graph which shows the tensile strength (N / cm) per unit width of each test piece in Example 4. FIG.

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, the present inventors examined from various angles. As a result, the present inventors use the metal foil manufactured by rolling (henceforth "rolled metal foil") as a raw material, and this rolled metal foil is given the hole formation process, and a mesh member is comprised, at least which comprises a line part. The present invention was completed by finding that one surface (the surface on which the squeegee is in contact) is flat and has a thickness of 25 µm or less, and that a high-definition screen printing mesh member without variation in strength can be realized.

In the mesh member of the present invention, it is an important requirement to use a rolled metal foil as the material. The rolled metal foil has a flat surface, thin and uniform thickness, high tensile strength, and very little variation in strength. When a mesh member is produced using such a rolled metal foil as a raw material, a mesh member having almost no variation in thickness or strength is obtained.

In addition, the thickness of the rolled metal foil is reflected in the thickness of the mesh member. Therefore, by forming a plurality of holes in the rolled metal foil having a thickness of 25 μm or less, an opening (hole) through which the paste is permeated, and a line portion for maintaining the strength in the case of the mesh member (shown by reference numeral 1a in FIG. 3). A mesh member having a thickness of 25 μm or less can be realized.

By constructing the mesh member as described above, the surface of the mesh member or the photosensitive oil agent 4 in contact with the squeegee 6 is flat and the movement of the squeegee 6 is smooth (FIG. 3 (a)). Thereby, it is easy to stretch | paste a paste uniformly (FIG.3 (b)), and can print the high definition pattern with a thin printing film thickness d2 (FIG.3 (c)). In addition, with the mesh member of 25 micrometers or less in thickness, and 60% or less of aperture ratio, printing film thickness d2 can be 15 micrometers or less in calculation (refer Table 1 above).

As described above, the thinner the thickness of the mesh member, the thinner the printed film thickness can be. However, in the current rolling technology, it is very difficult to stably obtain a rolled metal foil having a thickness of less than 5 µm. Moreover, in the rolled metal foil whose thickness is less than 5 micrometers, in order to ensure the intensity | strength required as a mesh member, sufficient opening ratio will not be obtained. In this regard, the thickness of the mesh member of the present invention is 5 µm or more and 25 µm or less.

According to the present invention, the strength characteristics required for the mesh member are satisfied, but the researches on the strength are as follows. First, various mesh members with different aperture ratios were produced by performing hole forming process by etching to stainless steel foil in which thickness (5 micrometers or more and 25 micrometers or less) differs. Specifically, after the opening pattern is drawn on the mask, the resist is applied to the rolled stainless steel foil, the opening pattern of the mask is exposed and developed, and after forming the hole by etching, the resist is peeled off to form various mesh members. Was produced.

The thickness of the produced mesh member (test No. 1-11 of Table 2 below) was measured with the micrometer (made by Mitsutoyo Corporation). Moreover, the optical microscope observation confirmed that the surface which comprises the line part 1a (namely, the surface which a squeegee contacts) is flat. Using the photographed microscope image, the line width (width of the line portion 1a) and the opening width (width of the hole) were measured by general-purpose image processing software (manufactured by Nano System Co., Ltd.), and the pitch (line width). And the total number of opening widths) to calculate the number of meshes (pieces / inch). In addition, the opening width and the pitch was calculated the rate of an opening - the opening width (㎛) ² / pitch ^{(㎛) 2 × 100 (%} )]. Further, the minimum cross-sectional area (mm 2 / cm) per unit width, corresponding to the cross-sectional area of the line portion between the openings per unit width,

10 mm x thickness (mm) x (1-√opening ratio (%)) ÷ 1 cm

It calculated from the formula of. In addition, said "(s) opening ratio (%)" means calculating as ((√)) when an aperture ratio is 50%, for example.

Moreover, the test piece of width: 15 mm and gage distance: 100 mm was cut out from the produced mesh member, and the tension test was done with the tensile tester (made by Oriente Co., Ltd.). The breaking load (N) at the time of performing a tensile test was converted into the width per 1 cm of a tensile test piece, and it calculated | required as tensile strength per unit width.

The above results [mesh thickness (μm), mesh number (pieces / inch), minimum cross-sectional area per unit width (mm 2 / cm), opening ratio (%), tensile strength per unit width (N / cm) are shown in the following table. 2 is shown. The "load test" shown in Table 2 is mentioned later. Moreover, about all the mesh members produced, it was confirmed that the line part 1a of the surface which a squeegee contacts is flat.

The present inventors analyzed the factor which affects the tensile strength of a mesh member from the result of the said tension test. As a result, it was found that the tensile strength (N / cm) per unit width of the mesh member produced by hole forming the rolled metal foil was proportional to the minimum cross-sectional area (mm 2 / cm) per unit width. The relationship between the minimum cross-sectional area (mm <2> / cm) per unit width, and the tensile strength (N / cm) per unit width is shown in FIG. The greatest stress when the mesh member is tensioned at the time of printing plate production is the line portion between the openings having the smallest cross-sectional area. In the mesh member fabricated by forming a hole in the rolled metal foil, the tensile strength per unit width is determined by the minimum cross-sectional area per unit width. Will be proportional.

The intensity | strength of the rolled metal foil before producing a mesh member is normally represented by tensile strength (N / mm <2>), and shows the specific tensile strength by the kind of rolled metal foil. In this regard, the calculated maximum value of the tensile strength (N / cm) per unit width of the mesh member produced from the rolled metal foil is [the tensile strength of the rolled metal foil (N / mm 2)] × [minimum cross-sectional area per unit width (mm 2). / Cm)].

MEANS TO SOLVE THE PROBLEM The present inventors performed the load test in order to evaluate whether the produced mesh member has the strength as a mesh member for screen printing plates of a high definition with a thin printing film thickness. In the load test, the mesh member simulated the aluminum frame of the printing plate with the four sides of the mesh member sandwiched therebetween, and the tension member (manufactured by PROTEC Co., Ltd.) was placed in the center of the mesh member in the same manner as the screen printing plate production. While measuring the volume (mm), the clamp was sandwiched between the mesh members to attach the mesh members. This is for simulating whether it can endure the pressure (press load) of the squeegee in a state where the mesh member is attached to the aluminum frame of the printing plate. In the state where the mesh member is attached in this way, using a compression tester (manufactured by Instron Co., Ltd.), a squeegee made of urethane rubber for screen printing attached to the chuck is pressed against the mesh member as in screen printing, It was observed whether the squeegee could withstand the pressure. Since the entire mesh member is broken when the front end of the mesh member is broken, observation is performed by visual observation, and the case where the front part of the mesh member has not been broken is "○" and the case where the front end of the mesh member is broken is "x". Was determined. The result was written together to the said Table 2.

As a result of the load test, Test Nos. 1 and 2 (comparative example shown in Fig. 4) were broken in the produced mesh members, while Test Nos. 3 to 11 (Example shown in Fig. 4) were not broken. That is, all the tensile strengths per unit width of the test Nos. 1 and 2 in which the mesh member was broken are less than 20 N / cm, and all the test Nos. 3 to 11 having the tensile strength per unit width of 20 N / cm or more are not damaged. Did. From the result of this test, it turned out that the mesh member which can be used for screen printing can be implement | achieved by setting the tensile strength per unit width of a mesh member to 20 N / cm or more. From this result, it was prescribed | regulated that the tensile strength per unit width which converted the breaking load N at the time of the tension test of the mesh member of this invention into 1 cm of width of a tensile test piece was 20 N / cm or more.

The present inventors also examined the relationship between the number of meshes and the printing accuracy of the mesh member for screen printing. As a result, it has been found that the use of a high viscosity paste can reduce printing bleeding and realize high-precision printing. In addition, in order to realize such high-precision printing, it is necessary to set the number of meshes to 250 (pieces / inch) or more. In this regard, in the mesh member of the present invention, the number of meshes is assumed to be 250 (pieces / inch) or more capable of printing a fine pattern. A mesh member having a mesh number of 250 (pieces / inch) or more formed by forming a hole in the rolled metal foil can be obtained by setting the pitch, which is the sum of the line width and the opening width, to 100 μm or less.

The strength of the mesh member which formed the hole forming process to the rolled metal foil is so high that an aperture ratio is small. However, when the opening ratio decreases, the filling amount of the paste in the opening portion decreases, and print blurring may occur. Therefore, when the mesh member which changed the aperture ratio was produced, the printing plate for screen printing was produced, and the printing test was carried out. When the aperture ratio is less than 25%, print blur occurs, but when the aperture ratio is 25% or more, good printing can be achieved. okay.

As mentioned above, the maximum value in calculation of the tensile strength (N / cm) per unit width of a mesh member is

[Tensile strength of rolled metal foil (N / mm 2)] × [Minimum cross-sectional area per unit width (mm 2 / cm)]

to be. The minimum cross-sectional area per unit width is

10 mm x thickness (mm) x (1-√opening ratio (%)) ÷ 1 cm

to be. Therefore, the calculation maximum value of tensile strength (N / cm) per unit width is

Tensile strength (N / mm 2) × 10 mm × thickness (mm) × (1-√opening ratio (%)) ÷ 1 cm of rolled metal foil

The larger the opening ratio, the smaller the calculated maximum value of the tensile strength (N / cm) per unit width.

From the result of the load test of a mesh member, as a mesh member for screen printing, the tensile strength per unit width is 20 N / cm or more. From this, the opening ratio of the mesh member needs to be at least the opening ratio (maximum opening ratio in the calculation phase) at which the tensile strength per unit width is at least 20 N / cm, even when the thickness is different. The maximum opening ratio in calculation is

20 N / cm = tensile strength of the rolled metal foil (N / mm 2) x 10 mm x thickness (mm) x (1-√opening ratio (%)) ÷ 1 cm

Since it can calculate from the relational expression of, the maximum opening ratio in a calculation can be calculated by following formula (1).

[Formula 1]

That is, the opening ratio of the mesh member should be less than or equal to the calculation maximum opening ratio calculated by the above formula 1 in order to ensure 25% or more of the opening ratio necessary for screen printing and to secure 20N / cm or more of tensile strength per unit width. desirable.

MEANS TO SOLVE THE PROBLEM The present inventors examined whether the tensile strength per unit width of a mesh member can secure 20 N / cm or more when the opening ratio of a mesh member is 25% or more and below the calculation maximum opening ratio computed by said formula (1). Since the tensile strength of the stainless steel foil used at this time is 1430 N / mm <2>, the calculation maximum opening ratio of the mesh member which consists of stainless steel foils,

[1-20 (N / cm) ÷ 1430 (N / mm 2) ÷ Thickness (mm) ÷ 10] ² × 100 (%)

It can calculate by When the thickness is 6 µm, the opening ratio is 59%, when the thickness is 10 µm, the opening ratio is 74%, when the thickness is 11 µm, the opening ratio is 76%, and when the thickness is 21 µm, the opening ratio is 87%. As a result of the examination, the opening ratios of the mesh members of Test Nos. 3 to 11 were all less than or equal to the calculation maximum opening ratio, and the tensile strength per unit width was 20 N / cm or more. The opening ratios of Test Nos. 1 and 2 exceeded 59%, which is the calculated maximum opening ratio at a thickness of 6 µm, and the tensile strength per unit width was less than 20 N / cm.

In the mesh member of the present invention, the shape (opening shape) of a plurality of holes to be formed is not limited, and may be, for example, a circle or a hexagon (the overall shape of the mesh member is a honeycomb shape). However, a quadrangular shape (the overall shape of the mesh member is a lattice shape) as indicated by A in FIG. 5 is suitable for maintaining the strength while securing the aperture ratio.

In addition, although the external appearance of a hole is not limited, It is preferable that it is formed so that it may expand toward a printing object. 6 is a view for explaining the external shape of the hole. FIG. 6A shows the outer shape of a normal hole in which the side wall of the hole 9 is perpendicular to the printing object (downward in FIG. 6). In FIGS. 6B to 6D, the cross-sectional shape of the line portion 1a is devised so that the external appearance of the hole is enlarged toward the printing object. FIG. 6B shows that the cross-sectional shape of the line portion 1a is an inverted trapezoidal shape, FIG. 6C shows that the cross-sectional shape of the line portion 1a is a semi-circular shape, and FIG. It has shown that the cross-sectional shape of the line part 1a is triangular shape, respectively.

In the case of a hole formed so as to be enlarged toward a printing object as compared with a hole having a normal shape (Fig. 6 (a)) (Fig. 6 (b) to (d)), since the return of the paste becomes good, the paste The viscosity of can be raised, and the bleeding at the time of printing can be made smaller. For example, after applying a resist only to one side of the rolled metal foil, the opening pattern of the hole is exposed and developed, and only one side of the rolled metal foil is etched by etching only from one side of the side where the resist is applied using a low concentration etching solution. By melt | dissolving, the hole 9 of various external shapes shown to FIG. 6 (b)-(d) can be formed. In addition, the opening ratio of the mesh member in the case where the shape of the hole is formed so as to be enlarged toward the printing object is taken as an average value of the opening ratio of the squeeze surface side and the printing target object side.

Since most of the products of the mesh member produced by weaving the conventional fine metal wire adopt the stainless steel fine wire, and since peripheral members such as paste are made on the assumption of the mesh member of stainless steel, stainless steel (stainless steel) Park is the most practical. Tensile tests of titanium foil, nickel foil, copper foil, and aluminum alloy foil (Al 95% to 98%) having lower strength than stainless steel foil were performed, and tensile strength (N / mm 2) was measured. From these tensile strengths, the calculation maximum opening ratio in the case of 15 micrometers in thickness, and the calculation maximum opening ratio in the case of thickness 25 micrometers from which the most intensity | strength are obtained were calculated. And it examined whether the maximum aperture ratio in these calculations was set to 25% or more of aperture ratio required for printing without print blur.

The maximum opening ratio in the case of thickness 15 micrometers and the case of thickness 25 micrometers computed from the tensile strength of titanium foil, nickel foil, copper foil, and aluminum alloy foil was as showing in following Table 3. As a result of examination, in the case of 15 micrometers in thickness, and 25 micrometers in thickness, 25% or more of opening ratio required as a mesh member for screen printing could be ensured with respect to the numerical aperture ratio of all the rolled metal foil. From this result, it turns out that titanium or a titanium alloy, nickel and a nickel alloy, copper or a copper alloy, and an aluminum alloy can be practical as rolled metal foil for producing this invention. In addition, the titanium alloy, nickel alloy, copper alloy, and aluminum alloy which a rolled metal foil can use as a raw material in this invention should just be a thing possible in foil shape. For example, as titanium alloy, JISCS46020, etc., if it is a nickel alloy, JISCS2520 (1986) NCHRW1, etc. As a copper alloy, JISH3130 C1720R-H etc., As an aluminum alloy, JISH4000 5052 etc. are mentioned. Such rolled metal foil is generally marketed and can be easily obtained.

As a method of forming many holes in the rolled metal foil which is a raw material, an etching process, a shot blasting process, a laser process, or the like can be adopted. MEANS TO SOLVE THE PROBLEM The present inventors tried the etching process, the shot blasting process, and the laser process in order to form the hole into a rolled metal foil.

In the case of an etching process, rolling metal foil is made taut and the following processes are performed in the state which affixed to the fixed plate with flat surfaces, such as glass. Or the following processes are performed in the state which the roll which rolled up the rolled metal foil adhered, ie, the state which adhered so that a rolled metal foil might not be wrinkled. First, the photosensitive resist is apply | coated as thinly as possible to a rolled metal foil, and then the pattern of the opening part of the mesh drawn on the mask is exposed and developed, and the pattern of the opening part is formed from the rolled metal foil. At this time, in order to accurately expose the fine pattern drawn on the mask to the rolled metal foil, the mask and the rolled metal foil are as close as possible to perform high-resolution exposure, and the pattern of the openings drawn on the mask is exposed by exposure, development and etching. The deviation is calculated. By development, the photosensitive resist of only an opening part is removed and the rolled metal foil only of an opening part is exposed. Using etching liquid according to the kind of rolled metal foil, etching liquid is made to contact the rolling metal foil only of an opening part, and hole formation process is performed. The mesh member of this invention is obtained by peeling a photosensitive resist after a hole formation process.

When manufacturing a mesh member by shot blast processing, first, a resist is apply | coated to a rolled metal foil in the state which was made to tighten a rolled metal foil and adhered to the hard, flat surface fixed plate, such as glass. Then, after exposing and developing an opening pattern, it is good to cut an opening by contacting a rolled metal foil with fine powder abrasives, such as silicon carbide (SiC).

When manufacturing a mesh member by laser processing, a hole is formed by irradiating a laser to a rolled metal foil. As a result of the study of each processing method, although any method can form a hole, it turned out that the hole formation by an etching process is the most suitable from the point of the precision and speed of an opening.

<Examples>

Hereinafter, although an Example demonstrates this invention still in detail, the following example is not a property which limits this invention, It is also possible to change suitably and to implement in the range which may be suitable for the purpose of the previous and the later, They are all included in the technical scope of the present invention.

Example 1

Using a commercially available stainless steel rolled foil (manufactured by Toyosei Co., Ltd .: standard SUS304-H), a mesh member was obtained by forming a hole by etching so that the shape of the opening was rectangular. . At this time, the line portion (1a shown in FIGS. 3 and 6) of the mesh member is flat, has a thickness of 10 μm, an opening ratio of 53%, and the number of meshes is 420 (piece / inch). The detailed manufacturing method of this mesh member is as follows. First, the rectangular opening pattern (pitch 60 micrometers) was drawn in the mask, the photoresist was apply | coated to the stainless steel rolled foil, and it developed after exposing the pattern. After image development, the hole formation process was performed by etching, and finally, the mesh member was obtained by peeling a photoresist. When actual printing was performed using this mesh member, there was no destruction of the mesh member, and it was confirmed that printing with a print film thickness of 5 µm was possible. The shape of the mesh member obtained at this time is shown to FIG. 7 (drawing-substituted microphotograph).

[Example 2]

Using commercially available stainless steel rolled foil (manufactured by Toyosei Chemical Co., Ltd .: Standard SUS304-H), a mesh is formed by forming holes by etching so that the shape of the opening is annular. The member was obtained. The line part of the obtained mesh member is flat, thickness is 10 micrometers, aperture ratio is 47%, and the number of meshes is 250 (piece / inch). The detailed manufacturing method of this mesh member is as follows. First, after drawing the annular opening pattern (pitch 100 micrometers) in a mask, it developed after exposing the photoresist to stainless steel rolled foil and exposing the pattern. After image development, the hole formation process was performed by etching, and finally, the mesh member was obtained by peeling a photoresist. When actual printing was performed using this mesh member, there was no destruction of the mesh member, and it was confirmed that printing with a print film thickness of 5 µm was possible. The shape of the mesh member obtained at this time is shown in FIG. 8 (drawing-substituted microphotograph).

[Example 3]

Using a commercially available stainless steel rolled foil (manufactured by Toyosei Co., Ltd .: standard SUS304-H), a mesh member was obtained by forming a hole by etching so that the shape of the opening was annular. . The line part of the mesh member is flat, 21 micrometers in thickness, 55% of aperture ratio, and 250 mesh pieces / inch. The detailed manufacturing method of this mesh member is as follows. First, after drawing the annular opening pattern (pitch 100 micrometers) in a mask, it developed after exposing the photoresist to stainless steel rolled foil and exposing the pattern. After image development, the hole formation process was performed by etching, and finally, the mesh member was obtained by peeling a photoresist. When actual printing was performed using this mesh member, it was confirmed that there was no destruction of the mesh member and printing with a printing film thickness of 12 µm was possible. The shape of the mesh member obtained at this time is shown to FIG. 9 (drawing-substituted microphotograph).

Example 4

In order to compare and examine the strength of the electrolytic foil mesh member obtained by forming a hole in the electrolytic metal foil produced by the plating method and the rolled metal foil mesh member of the present invention, a tensile test of the electrolytic foil mesh member and the rolled metal foil mesh member of the present invention is performed. It was done. The electrolytic foil mesh member was produced by hole forming process by etching to commercially available electrolytic nickel foil (made by Fukuda Kinshi Kogyo Kogyo Co., Ltd., Ni: 99% or more) by etching. As for the electrolytic foil mesh member, both surfaces which comprise a line part are flat, 25 micrometers in thickness, 250 mesh pieces (piece / inch), 62% of opening ratio, and the side wall of a hole are perpendicular | vertical. The rolled metal foil mesh member of this invention was produced by carrying out hole forming process by etching to the commercially available rolled nickel foil (made by Toyosei Co., Ltd. standard VNi-H). As for the mesh member which processed the rolled nickel foil, both surfaces which comprise a line part are flat, 20 micrometers in thickness, the number of meshes 250 (piece / inch), the opening ratio 67%, and the side wall of a hole are perpendicular | vertical. The test piece of width 15mm and gage distance 100mm was cut out from each mesh member, and the tension test was done.

10 shows the tensile strength per unit width of each test piece. In the conventional electrolytic nickel foil mesh member, the variation of the tensile strength per unit width for every test piece was larger than the rolled nickel foil mesh member of this invention.

From this result, it turns out that the mesh member with little variation in strength can be implement | achieved by hole forming process to rolled metal foil. In addition, the average value of the tensile strength per unit width of each test piece was 28 N / cm in the electrolytic nickel foil mesh member, and 28 N / cm in the rolled nickel foil mesh member. Although the rolled nickel foil mesh member had a thickness thinner than the electrolytic nickel foil mesh member, and had a large aperture ratio, high strength was obtained.

As mentioned above, although this invention was detailed also demonstrated with reference to the specific embodiment, it is clear for those skilled in the art that various changes and correction can be added without deviating from the mind and range of this invention. This application is based on the JP Patent application (Japanese Patent Application No. 2009-020282) of January 30, 2009, and the Japanese Patent Application (Japanese Patent Application No. 2009-293182) of December 24, 2009, The contents are hereby incorporated by reference.

Since the mesh member of this invention has a flat surface at a line part, compared with the mesh which woven the fine wire which has an unevenness | corrugation on the surface, movement of a squeegee becomes smooth and it is easy to stretch | paste a paste uniformly. In addition, the presence of the smooth portion also has the advantage that adhesion with the resin mesh is facilitated when the combination mask (a mask of a metal mesh around the center and a metal mesh around the center) is produced.

By the way, in the mesh member which woven the fine wires, such as stainless steel, since the light touches the fine wire surface at the time of exposure after apply | coating a photosensitive emulsion, and a reflection direction changes, it will harden to the photosensitive emulsion of the pattern part which does not harden a photosensitive emulsion originally. The greater the aperture ratio, the smaller the halation during exposure at the time of printing plate production. However, in the mesh member of the present invention having a flat surface, the reflection direction of light becomes constant compared with the mesh member produced by weaving fine wires even at the same aperture ratio. Therefore, the halation at the time of exposure decreases, the width | variety of a printing pattern becomes uniform, and the resolution of a printing plate can be expected to be high.

1: Fine
2: opening
3: Print pattern part
4: photosensitive emulsion (resin)
5: Printing
6: Squeegee
7: paste (ink)
7a: Smearing
8: Print object
9: hole

Claims (4)

It is a mesh member for screen printing,
One or more surfaces forming a plurality of openings by performing hole forming processing by etching on the rolled metal foil having a thickness of 5 μm or more and 25 μm or less are flat,
The number of meshes is greater than 250 (inches / inch),
The lower limit of the aperture ratio is 25% or more, and the upper limit of the aperture ratio is equal to or less than a value obtained from Equation 1 below.
In the test piece cut out from the screen printing mesh member, the tensile strength obtained by converting the breaking load (N) at the time of performing the tensile test per 1 cm of the width of the tensile test piece is 20 N / cm or more, characterized in that the screen printing mesh absence.
[Formula 1]

The mesh member for screen printing of Claim 1 formed so that the thickness direction shape of an opening part may expand toward a printing object. The mesh member for screen printing according to claim 1, wherein the rolled metal foil is made of any one of stainless steel, titanium or titanium alloy, nickel or nickel alloy, copper or copper alloy, and aluminum alloy. delete

Images