TW201408152A - Intaglio plate for offset gravure printing and printed wiring board - Google Patents

Abstract

Provided are an intaglio plate for offset gravure printing and a printed wiring board. The present invention prevents ink removal failures and a doctor etc. from jumping, and stably supplies a printed wiring board that is free of ink leaks, pinholes and pattern loss. The intaglio plate for offset gravure printing (210) is provided with a pattern section for forming a wiring pattern. Amid the pattern section (211), a pattern section (212) positioned at the end in the printing direction is substantially arc shaped. Furthermore, amid the pattern section, a pattern section positioned at the beginning in the printing direction is substantially arc shaped.

Description

Gravure and printed wiring substrate for gravure lithography

The present invention relates to a gravure plate for gravure lithography, and a printed wiring substrate having a wiring pattern formed by gravure lithography using the gravure.

In recent years, gravure lithography has been increasing as a method of manufacturing industrial products in various fields such as a building material field, a packaging field, a publishing field, and an electronic field, such as a living system, an electric system, and an information system. Gravure lithography is a technique in which various high-viscosity coating materials such as various inks, resins, and conductive pastes are used to print an excellent image having high resolution and high dimensional accuracy over a wide range and stably on the surface of a printing object.

Figure 1 shows the general gravure lithography process. Gravure lithography is a transfer printing method in which an ink 102 is filled in a gravure made of glass, resin, metal, or the like by a doctor, a squeegee, or a scraper 103. The process in the pattern portion 104 of the intaglio plate for lithography 101 (process 1); the transfer body 111 having the transfer layer 112 having a surface formed of a resin such as fluorenone or the like is brought into contact with the ink 102 having been filled in the pattern portion 104. The process of transferring the ink coating film 113 onto the transfer layer 112 by rotating the intaglio plate 100 for gravure lithography (process 2); and pressing the transfer body 111 In the to-be-printed body 121, the printing pattern 122 of the ink coating film 113 remaining on the transfer layer 112 is further transferred to the process of the to-be-printed body 121 (process 3). This gravure lithography system can print various high-viscosity coating materials such as inks, resins, conductive pastes, and the like on the surface of a printed object with high resolution and high dimensional accuracy in a wide range.

The IC card antenna (coil-like pattern), the conductive wiring of the solar cell backplane, the electromagnetic wave shield, and the signal for the touch panel are embossed by gravure lithography and using a conductive ink or a conductive paste. When high-definition printing such as wiring is performed on a substrate composed of polyethylene terephthalate, polyethylene naphthalate, acrylic, glass, or the like, the following functions are required.

[1] It is possible to perform uniform and stable high-definition fine line printing over a wide range.

[2] The fine lines printed on the printed object are not broken or short-circuited.

[3] A thin line that can print a stable film thickness.

In order to mass-produce the fine line pattern using the gravure lithography having the above-described functions, it is necessary to reliably transfer the ink filled in the inside of the desired pattern portion of the intaglio to the transfer layer having the ink releasability. Further, in order to form a fine line pattern without a broken line, it is necessary to fill the inside of the desired pattern portion with a doctor blade, a squeegee or a doctor blade in advance, and to flatten the ink surface filled in the inside of the pattern portion. When the transfer body having the transfer layer having ink releasability is pressed, the ink surface is uniformly brought into contact with the transfer body.

In order to achieve the above-described functions, for example, Patent Document 1 discloses that the film is printed on a thick film, particularly a fine image, or In the formation of patterns such as surface images, such as pinholes and broken lines, lithographic multi-printing is employed to prevent the discontinuities of the thin lines, the pinholes caused by the plug holes of the printing plates, and the stretching of the printed pattern.

Prior technical literature Patent literature

Patent Document 1 Japanese Laid-Open Patent Publication No. 55-5856.

However, in the method described in Patent Document 1, the process and the operation are complicated by performing multiple coating. Further, the means for flattening the ink surface filled in the inside of the pattern portion of the intaglio plate so that the ink surface is uniformly contacted with the transfer body and is surely transferred to the transfer layer is not specifically disclosed in Patent Document 1. On the other hand, when there is an acute angle portion in the wiring pattern to be printed, when the ink is filled into the inside of the pattern portion corresponding to the concave plate of the acute angle portion, the doctor blade or the like is hooked to the acute angle portion to cause the doctor blade or the like. Jump or ink leak from the gravure. Further, since the transfer layer of the transfer body is insufficiently involved in the inside of the pattern portion of the intaglio plate, the ink cannot be reliably transferred, and the ink is poorly taken out. In gravure lithography, this problem becomes more conspicuous as the more desirable fine line patterns are formed.

Therefore, an object of the present invention is to prevent a jump in a squeegee or the like or a defect in taking out ink, and to stably supply a printed wiring substrate free from ink leakage, pinholes, and pattern defects.

As a means for solving the above problems, one aspect of the present invention is a gravure for gravure lithography, which has a pattern portion for forming a wiring pattern, and the gravure for gravure lithography is characterized in that the pattern portion is located in printing The shape of the terminal or the pattern of the starting end of the direction is substantially arc-shaped.

Further, the width of the pattern portion is preferably 10 μm or more and 5 mm or less, and the radius of curvature of the pattern portion is preferably 10 μm or more and 200 μm or less.

Further, another aspect of the present invention is a printed wiring substrate having a wiring pattern formed by gravure lithography, the printed wiring substrate being characterized by a terminal or a starting end of the wiring pattern in the printing direction The shape of the wiring pattern is substantially arcuate.

Further, the width of the wiring pattern is preferably 10 μm or more and 5 mm or less, and the radius of curvature of the wiring pattern is preferably 10 μm or more and 200 μm or less.

By using the intaglio plate for gravure lithography of the present invention, it is possible to prevent the squeegee or the like from jumping or the ink from being taken out, and to form a printed wiring substrate free from ink leakage, pinholes, and pattern defects. In particular, as the wiring pattern is further thinned, the gravure for gravure lithography of the present invention is more remarkable, and thus it is suitable for formation of a fine wiring pattern.

101‧‧‧ Gravure for gravure lithography

102‧‧‧Ink

103‧‧‧Scraper, squeegee or scraper

104‧‧‧The Department of Patterns

111‧‧‧Transfer body

112‧‧‧Transfer layer

113‧‧‧Ink coating

121‧‧‧Printed body

122‧‧‧Printed pattern

210‧‧‧Gravure for gravure lithography

211‧‧‧The Department of Patterns

212‧‧‧End Department

310‧‧‧ Gravure for gravure lithography

311‧‧‧The Department of Patterns

312‧‧‧ starting end

410‧‧‧Gravure for gravure lithography

411‧‧‧The Department of Patterns

412‧‧‧ starting end

413‧‧‧End Department

510‧‧ ‧ gravure for gravure lithography

511‧‧‧The Department of Patterns

512‧‧‧ starting end

513‧‧‧End Department

Figure 1 is a process diagram of gravure lithography of the present invention.

Fig. 2 is a plan view showing an embodiment of the intaglio plate for gravure lithography of the present invention.

Fig. 3 is a plan view showing an embodiment of the intaglio plate for gravure lithography of the present invention.

Fig. 4 is a plan view showing a gravure for gravure lithography of the embodiment.

Fig. 5 is a plan view showing a gravure for gravure lithography of a comparative example.

[Formation for carrying out the invention]

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Further, the embodiment of the present invention is not limited to the embodiment described below, and modifications such as changes in design may be added according to the knowledge of those skilled in the art, and the embodiment after the modification is also included in the embodiment of the present invention. Within the scope.

[About gravure for gravure lithography]

Hereinafter, the process of gravure lithography according to the embodiment of the present invention will be described with reference to Fig. 1, which is a general process diagram of gravure printing.

First, as shown in the first process of Fig. 1, the ink 102 is placed on the intaglio plate gravure 101, and the ink 102 is rolled by a certain pressure against the arrow in the figure by a doctor blade, a squeegee or a doctor blade 103. The ink 102 is placed on the intaglio plate 100 for gravure printing, whereby the ink 102 is filled in the pattern portion 104 of the intaglio plate 100 for gravure printing.

In this case, the pattern portion 104 of the intaglio plate for gravure lithography has a width of about 10 μm to 5 mm, preferably 40 μm to 700 μm, more preferably 100 μm to 400 μm, and a groove having a depth of about 5 μm to 20 μm. . Further, the distance between the groove and the groove is about 10 μm to 100 μm, and preferably 20 μm to 50 μm. Here, when the pattern portion of the pattern portion has an acute angle portion in the pattern portion of the terminal in the printing direction, the ink filling blade such as the doctor blade jumps at the acute angle portion to cause ink leakage. Thereby, an island-shaped defect occurs in the vicinity of the acute corner portion of the pattern portion.

Therefore, in the pattern portion of the intaglio plate for gravure lithography of the present invention, for example, as shown in Fig. 2, when the squeegee is moved in the Y direction using the intaglio 210 for gravure lithography having the pattern portion 211, the pattern portion The terminal portion 212 in the Y direction of 211 has an arc shape. Thereby, it is possible to prevent the squeegee from jumping, and it is possible to reduce the island-like defect occurring in the vicinity of the pattern portion of the terminal located in the printing direction.

The shape of the end portion 212 in the Y direction in the pattern portion 211 is substantially arc-shaped by an arbitrary curve such as an arc shape that can prevent the squeegee from jumping, a shape that is rounded, an elliptical arc shape, or the like. It is better. Further, in the case where the shape of the end portion 212 in the Y direction in the pattern portion 211 is substantially arcuate, the radius of curvature (R) is preferably 10 μm to 200 μm, and more preferably 20 μm to 150 μm. For example, in the case of the example shown in FIG. 2, the end portion 212 in the Y direction of the pattern portion 211 has an arc shape. Therefore, the radius of curvature (R) of the entire curve constituting the end portion 212 is 10 μm to 200 μm. Preferably, it is more preferably 20 μm to 150 μm. Further, the Y direction in the pattern portion 211 When the terminal portion 212 is formed into a rounded shape, the radius of curvature (R) of the corner formed in the end portion 212 is preferably 10 μm to 200 μm, and is preferably 20 μm to 150 μm. For better.

Further, the shape of the end portion 212 in the Y direction in the pattern portion 211 is formed into an arc shape by the shape of the upper surface of the intaglio plate gravure 210. On the other hand, the shape of the side cross section of the end portion 212 in the Y direction in the pattern portion 211 is not particularly limited, and a shape in which the corner portion is formed at about 90 degrees and a corner portion at an obtuse angle is formed into a circle. A shape formed by a substantially arc shape at an angle.

Here, the printing direction refers to a moving direction of the transfer body when the ink coating film transferred to the surface of the transfer layer of the transfer body is transferred to the object to be printed. This printing direction is the same as the moving direction of the transfer body when the ink filled in the pattern portion of the intaglio plate for gravure printing is transferred to the surface of the transfer layer of the transfer body. Further, the terminal end in the printing direction of the pattern portion of the intaglio plate for gravure lithography means the position of the concave portion disposed on the most downstream side in the moving direction of the transfer body. In other words, the position refers to the position of the concave portion of the intaglio plate for gravure lithography which is finally in contact with the transfer body. In addition, this terminal is also referred to as a terminal unit.

Further, the intaglio plate 100 for gravure lithography preferably has a flat surface. Thereby, printing can be performed without leakage of ink toward the surface of the intaglio. Further, it is possible to suppress a notch or the like of the doctor blade or the like. Here, the surface of the intaglio plate for gravure lithography refers to the surface of the intaglio plate gravure 101 for contact with the doctor blade, the squeegee or the blade 103, or the pattern portion 104 (groove) of the intaglio plate 100 for gravure lithography. Inside table surface. Further, the surface of the intaglio plate for gravure lithography can be flattened by rough grinding, mirror polishing, or ultra-precision polishing (grinding or polishing).

As a method of forming the pattern portion 104 of the intaglio plate 100 for gravure lithography, an etching method, an electroforming method, a sand blast method, or the like can be given. From the viewpoint of workability of the formation method of these, it is preferable to use a gravure 101-type glass for gravure lithography, a metal such as copper or nickel. Further, it is preferable to form a scratch-resistant coating film of chromium or carbon on the surface.

Further, from the viewpoint of filling the ink portion 102 in the pattern portion 104 of the intaglio plate gravure 101 and scraping the ink 102 on the intaglio plate gravure 101, it is required that the doctor blade, the doctor blade or the doctor blade 103 have a certain Degree of deflection. Therefore, it is preferable to use a metal such as a doctor blade, a squeegee or a doctor blade 103, or a resin such as a polyurethane or a ceramic such as a polyurethane.

Next, as shown in the second process of Fig. 1, the transfer body 111 having the transfer layer 112 is rotated and moved on the intaglio plate gravure 101 in which the pattern portion 104 is filled with the ink 102, and the intaglio plate for gravure lithography is used. The ink 102 in the pattern portion 104 is transferred onto the transfer layer 112, and an ink coating film 113 is formed on the transfer layer 112. As the material for forming the transfer layer 112, a known material can be used, and among them, an anthrone rubber is preferable.

At this time, in order to form a wiring pattern having no pinholes or a pattern, it is necessary to uniformly contact the surface of the transfer layer 112 with the surface of the ink 102 filled in the pattern portion 104 of the intaglio plate gravure 101 in the contact surface. However, if there is a pattern portion at the beginning of the printing direction In the acute corner portion, the transfer layer of the transfer body does not fall inside the pattern portion in the vicinity of the acute corner portion, and pinholes and patterns are defective due to ink removal failure.

Therefore, in the pattern portion of the intaglio plate for gravure printing of the present invention, for example, as shown in Fig. 3, when the transfer body is moved in the Y direction by using the intaglio plate for gravure lithography having the pattern portion 311, the pattern portion The start end portion 312 in the Y direction of 311 is shaped into a rounded shape. Thereby, the transfer layer of the transfer body is sufficiently dropped inside the pattern portion, so that the ink removal failure can be reduced.

The shape of the starting end portion 312 in the Y direction of the pattern portion 311 is substantially arc-shaped, which is formed by an arbitrary curve such as an arc shape that can reduce ink removal failure, a shape that is rounded, an elliptical arc shape, or the like. A shape formed by a part of a polygon such as an octagon or the like is preferable. Further, when the shape of the starting end portion 312 in the Y direction in the pattern portion 311 is substantially arcuate, the radius of curvature (R) is preferably 10 μm to 200 μm, more preferably 20 μm to 150 μm. For example, in the case of the example shown in FIG. 3, the start end portion 312 of the pattern portion 311 in the Y direction is a shape that is rounded, and therefore, is rounded in the curve constituting the start end portion 312. The radius of curvature (R) of the corner is preferably from 10 μm to 200 μm, more preferably from 20 μm to 150 μm. Further, when the start end portion 312 of the pattern portion 311 in the Y direction is an arc shape, the radius of curvature (R) of the entire curve constituting the start end portion 312 is preferably 10 μm to 200 μm, and is preferably 20 μm. 150 μm is more preferred.

Further, the shape of the starting end portion 312 in the Y direction in the pattern portion 311 is such that the shape of the upper surface of the intaglio plate for gravure lithography is formed into a rounded shape. On the other hand, the shape of the side cross section of the starting end portion 312 in the Y direction in the pattern portion 311 is not particularly limited, and a shape in which the corner portion is formed at about 90 degrees and a corner portion at an obtuse angle is formed. A shape formed by a rounded shape and a substantially arc shape.

Here, the starting end of the printing direction of the pattern portion of the intaglio plate for gravure lithography means the position of the concave portion disposed on the most downstream side in the moving direction of the transfer body. In other words, the position refers to the position of the concave portion of the intaglio plate for gravure lithography which is initially in contact with the transfer body. In addition, this starting end is also referred to as the starting end.

Finally, as shown in the third process of FIG. 1, the transfer body 111 is rolled to transfer the ink coating film 113 onto the object to be printed 121, whereby the printed pattern 122 is formed, and a printed wiring substrate is obtained. Further, in the present invention, the pattern portion of the intaglio plate for gravure lithography is characterized in that the shape of the end portion or the starting end portion in the printing direction is a substantially arc shape, and the other portions are, for example, the end portion of the printing direction in which the pattern portion is connected. And the central portion of the starting end portion may be a shape having a narrower width or a curved end than the end portion or the starting end portion of the printing direction, or may be a shape of a single number or a plurality of patterns from the center portion.

[About printed wiring substrate]

The printed wiring substrate of the present invention is produced by gravure lithography using the gravure for gravure lithography of the present invention described above. First, the ink filled in the pattern portion of the intaglio plate for gravure printing of the present invention is transferred onto the transfer layer of the transfer body. Next, the formed ink coating film is transferred onto the substrate, whereby a printed pattern is formed on the substrate.

A printed pattern formed on a substrate, wherein a shape of the wiring pattern at the terminal end in the printing direction is substantially arcuate. As described above, in the printed wiring board of the present invention, since the wiring pattern located at the end of the printing direction has a substantially arc shape, it has a high-definition wiring pattern which is free from island defects due to ink leakage. Further, since the shape of the wiring pattern corresponds to the shape of the pattern portion of the intaglio plate for gravure printing, the width of the wiring pattern is about 10 μm to 5 mm, preferably 40 μm to 700 μm, and more preferably 100 μm to 400 μm. Further, in the case where the shape of the wiring pattern at the end of the printing direction in the printing direction is substantially arcuate, the radius of curvature (R) is preferably 10 μm to 200 μm, more preferably 20 μm to 150 μm.

Further, in the printed pattern formed on the substrate, the shape of the wiring pattern located at the beginning of the printing direction is substantially arcuate. As described above, in the printed wiring board of the present invention, the wiring pattern located at the beginning of the printing direction has a substantially arc shape, and thus has a high-definition wiring pattern having no pinholes or pattern notches. Further, since the shape of the wiring pattern corresponds to the shape of the pattern portion of the intaglio plate for gravure printing, the width of the wiring pattern is about 10 μm to 5 mm, preferably 40 μm to 700 μm, and more preferably 100 μm to 400 μm. Further, when the shape of the wiring pattern at the start end of the printing direction in the printing pattern is substantially arc-shaped, the radius of curvature (R) is preferably 10 μm to 200 μm, more preferably 20 μm to 150 μm.

[Examples]

First, two kinds of intaglio plates for gravure lithography having a pattern portion for testing are prepared. Figure 4 shows the gravure lithographic printing of the embodiment The brush is constructed with a rough outline. In the gravure plate for gravure lithography used in the examples, a glass having a length of 120 mm, a width of 120 mm, and a height of 3 mm was used, and the pattern portion 411 was formed by etching. The width of the pattern portion 411 is 300 μm. The depth of the pattern portion 411 is 10 μm. The start end portion 412 and the end portion 413 in the printing direction (Y direction) are formed in an arc shape.

Next, Fig. 5 shows a gravure for gravure lithography of a comparative example. In the gravure 510 for gravure printing of a comparative example, the glass of the longitudinal length of 120 mm, the width of the width of 120 mm, and the height of 3 mm was used, and the pattern part 511 was formed by etching. The width of the pattern portion 511 is 300 μm. The depth of the pattern portion 511 is 10 μm. The start end portion 512 and the end portion 513 in the printing direction (Y direction) are constituted by acute angles.

In order to use these two types of intaglio for gravure lithography, a wiring pattern made of a conductive silver paste was formed on a polyethylene terephthalate substrate, and gravure lithography was performed.

The polyethylene terephthalate substrate used was a thickness of 188 μm, a length of 120 mm, and a width of 120 mm. Further, as the conductive silver paste, an ink having a viscosity of 9.5 Pa.s at an angular velocity of 10 rad/sec as measured by a rheometer was used. In addition, the ink-repellent transfer system was obtained by winding a material having a rubber hardness (JIS A) of a ketone rubber manufactured by Jinyang Co., Ltd. as a main body and having a rubber thickness of 0.6 mm. Further, the doctor blade used a standard type doctor blade manufactured by MDC.

The gravure lithography apparatus uses a printing apparatus generally used. The printing conditions were such that the speed of the doctor blade was 50 mm/sec, the speed of the transfer body was 50 mm/sec, and the transfer body was in contact with the intaglio plate for gravure lithography. The width, the contact width of the transfer body and the polyethylene terephthalate substrate were uniformly 10 mm.

The printed wiring substrates of the examples and the comparative examples were produced by the following processes. First, the conductive silver paste is filled in the pattern portion of the prepared intaglio plate 810 for gravure printing by a doctor blade. Next, on the intaglio for gravure lithography filled with ink, the transfer body is rotated and moved in the printing direction (Y direction) of the intaglio plate for gravure printing to form a coating film of conductive silver paste on the fluorenone rubber. Finally, the transfer body of the coating film on which the conductive silver paste is formed is rotated and moved in the printing direction of the polyethylene terephthalate substrate, and the coating film of the conductive silver paste is transferred to the polyterephthalic acid. A wiring pattern is further formed on the ethylene glycol substrate.

Under the above conditions, intaglio lithography was performed on each gravure for gravure lithography of the examples and the comparative examples, and 20 printed wiring substrates of the examples and the comparative examples were produced. The wiring pattern of the printed wiring substrate of the example has no pinholes and ink leakage, and the wiring pattern has a good shape. On the other hand, the wiring pattern of the printed wiring board of the comparative example was confirmed, and there was a pinhole at the beginning of the printing direction, and there was an island-like abnormality due to ink leakage at the terminal.

By using the intaglio plate for gravure lithography of the present invention, a printed wiring substrate having a good wiring pattern without pinholes and island-like abnormalities can be produced.

210‧‧‧Gravure for gravure lithography

211‧‧‧The Department of Patterns

212‧‧‧End Department

Claims (4)

A gravure for gravure lithography having a pattern portion for forming a wiring pattern, wherein the gravure for gravure lithography is characterized in that a shape of a pattern portion at a terminal end or a starting end of the pattern portion in a printing direction is a substantially circular arc shape. The intaglio plate for gravure lithography according to the first aspect of the invention, wherein the width of the pattern portion is 10 μm or more and 5 mm or less, and the radius of curvature of the pattern portion is 10 μm or more and 200 μm or less. A printed wiring substrate having a wiring pattern formed by gravure lithography, wherein the printed wiring substrate is characterized in that a shape of a wiring pattern at a terminal or a starting end of the wiring pattern in a printing direction is a substantially circular arc shape. The printed wiring board according to the third aspect of the invention, wherein the width of the wiring pattern is 10 μm or more and 5 mm or less, and the wiring pattern has a radius of curvature of 10 μm or more and 200 μm or less.