JPH0655827A - Print transfer method and offset printing machine to be used for that - Google Patents

Abstract

PURPOSE:To provide a print transfer method, which can form easily thick film fine wiring having a narrow wiring pitch and specific wire width and has easy inspection and high yield and productivity further, and an offset printing machine to be used for the method. CONSTITUTION:At least a part of a transfer body sheet 105 which is provided at least with a screen form plate 103 capable of moving horizontally, a turnable cylindrical roller 104 and a squeegee 102 capable of performing an up-and-down motion and has the outermost surface layer comprised of silicone rubber is wound around a side of the cylindrical roller 104 through a compression layer 106 and the screen form plate 103 is moved horizontally by making use of a squeegee 101, through which ink is printed on the transfer body sheet 105. An X axis table 108 is moved directly after that by pressurizing a printed body 107 and the transfer body sheet 105 while heating the upper part of the printed body 107 and the ink is transferred to the upper part of the printed body 107 from the transfer body sheet 105.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fine thick film wiring printing technique for forming fine conductor wiring on a circuit board or the like, and more particularly to a print transfer method utilizing transfer and an offset printing machine used therefor.

[0002]

2. Description of the Related Art With the miniaturization of electronic devices, it is required that the circuit boards used for the electronic devices have multiple layers and high density. In order to realize this, it is essential to make the wiring of the circuit board fine. Recently, COB
Due to the development of (Chip on Board) technology and the like, the wiring of the circuit board is further miniaturized, and the fine wiring of 25 micron width line and 50 micron pitch is required.

Conventionally, in the production of hybrid ICs and ceramic multi-layer substrates using ceramic substrates, Cu and Ag / Ag /
Wiring such as Pd is formed by a simple screen printing method that enables thick film printing. The screen printing method is known and is the most general printing method with excellent productivity.

[0004]

However, in the conventional screen printing method, a 75 micron wide line, 150
Micron pitch fine line wiring printing is the limit, and further,
When a printing failure occurs such that the printed lines are connected to each other or the printed lines are cut off in the middle, the substrate must be discarded. When printing on a substrate, a short circuit occurs due to a large ink discharge amount or ink flow. In addition, wire breakage is more likely to occur with thinner wires,
This occurs because the ink does not flow into the non-opening portion of the screen mesh where the ink is not ejected. At the research level, a report of printing fine lines with a width of 30 to 50 microns using a screen plate (ISHM 1990 P
rosecedings pp. 445-452), but they are easily short-circuited, and there are many problems to be solved before they can be introduced into mass production. In addition to printing technology, inspection methods and disposal of defective printed boards are major problems.

Further, the screen printing method has a problem that printing cannot be performed on the entire surface of the substrate if the substrate has irregularities. A transfer method is effective as a method for solving this problem.
As a technique relating to this, for example, a transfer method using a transfer sheet having a release layer and an adhesive layer (USP 50699).
54) and solventless thermoplastic inks for use in transfer with silicone rubber (USP 4472537 and US
P 4426227). However, it is difficult to form a thick film fine line having a width of 30 to 50 microns only by using these methods or the above ink, and a new technique is required.

The present invention solves the above-mentioned conventional problems. The wiring pitch is narrow, and the width is from 30 μm to 10 μm.
Thick film fine wiring of 0 micron width can be easily formed with good quality, and printing on the uneven surface and intermediate inspection are possible.
An object of the present invention is to provide a print transfer method excellent in mass productivity and an excellent offset printing machine used therefor.

[0007]

In order to achieve this object, the printing transfer method of the present invention uses a screen plate and is arranged in a curved shape, and the outermost surface layer has solvent absorbability and releasability. An ink is printed on a transfer body sheet made of an elastic body, and then the ink is transferred from the transfer body sheet onto a printing medium, or a printing plate such as a flat screen plate is used to form an outermost surface layer. On a transfer sheet made of silicone rubber, an ink containing at least an organic solvent and a thermoplastic resin is used, and thereafter, a printing object or a transfer sheet is heated to change the transfer sheet to the printing object. It is basically characterized in that the above ink is transferred onto the upper surface, and more preferably, at least a part of the transfer body sheet is wound around the side surface of the cylindrical roller arranged horizontally with the flat screen plate. It is intended to print ink on the transfer sheet wound around the side surface of the cylindrical roller using a squeegee.

It is preferable to use a copolymer of isodecyl methacrylate, isobutyl methacrylate and glycidyl methacrylate as a binder resin for the ink. For the transfer sheet, a silicone rubber layer is formed on a resin film having a thickness of 100 μm or less. The formed plate is preferable. Further, as the printing plate, it is preferable that the emulsion thickness is 10 to 30 μm and the screen is 300 mesh or more. Further, it is desirable to dispose an elastic compression layer under the transfer sheet.

Further, the offset printing machine of the present invention is a flat plate which is movable in a plane direction, and a rotatable plate which is positioned below the flat plate and is arranged horizontally with the flat screen plate. A cylindrical roller, and a squeegee that can move up and down, and a printing object that is arranged horizontally with the flat screen plate through a cylindrical roller, and the outermost surface layer is made of silicone rubber. At least a part of the transfer sheet is wound around the side surface of the cylindrical roller, and the screen plate is moved horizontally while pressing the squeegee against the flat screen plate to print ink on the transfer sheet. It has the following configuration. Further, it is desirable to dispose an elastic compression layer under the transfer sheet, and further, a distance between the rotation center of the cylindrical roller wound with the transfer sheet and the flat screen plate, and the cylinder. It is desirable to have guide rollers for keeping the distance between the center of rotation of the die roller and the surface of the printing medium arbitrarily and constant. Further, it is preferable that a plurality of the cylindrical rollers on which the transfer sheet is arranged are provided.

[0010]

With the above arrangement, the print transfer method of the present invention is
Short circuit and disconnection are reduced, the wiring pitch is narrow, and thick film fine wiring with a width of 30 to 100 microns can be easily formed. Furthermore, it is easy to print on uneven surfaces and to perform intermediate inspection, which is excellent in mass productivity. The print transfer method can be realized, and the offset printing machine of the present invention has a narrow wiring pitch, and facilitates high-quality printing without short-circuiting thick film fine wiring having a width of 30 to 100 microns. Therefore, it is possible to realize an offset printing machine excellent in mass productivity.

In the print transfer method of the present invention, a screen plate is used to temporarily print the ink on an elastic body having solvent absorbability and releasability such as silicone rubber. By using a screen plate, thick film fine lines in all directions can be printed. When an ink containing an organic solvent is used, for example, since silicone rubber absorbs the solvent, the viscosity of the printed ink increases immediately after printing, and the ink is difficult to drip. Therefore, it is possible to realize printing with a narrower pitch than the conventional screen printing. In addition, since the solvent in the ink is further absorbed on the silicone rubber, the ink becomes a film and is less likely to be crushed.

When the silicone rubber is pressed against the material to be printed when the solvent is properly absorbed, the ink is completely transferred onto the substrate. This is because the silicone rubber has excellent releasability, and the elasticity of the silicone rubber allows printing on uneven surfaces. On the other hand, if the ink is left on the silicone rubber for a long time, the ink may be dried too much and the transferability onto the printing material may be deteriorated. In the offset printing method of the present invention, at least the organic solvent is used. By using an ink containing a resin and a thermoplastic resin, and transferring the ink after heating the transfer sheet on which the ink is printed or the substrate to be printed before printing, the organic solvent in the ink is absorbed. However, offset printing can also be performed by the adhesive force of the thermoplastic resin. In particular, an ink using a copolymer of isodecyl methacrylate, isobutyl methacrylate, and glycidyl methacrylate as a binder resin has a viscous adhesive property and a film-forming property, and thus can be transferred with good quality. Further, since this resin has thermal decomposability, it can be debindered under a low oxygen concentration, and therefore can be used for an ink using a metal powder that is easily oxidized, such as copper. Before this transfer, an intermediate inspection can be performed, and it is possible to inspect the printing state of the ink on the transfer body sheet and transfer only a good product.

Further, in the printing transfer method of the present invention, a transfer body sheet having an outermost surface layer made of silicone rubber is wound around at least a part of a side surface of a cylindrical roller which is horizontally fixed to a flat screen plate to form a transfer body sheet. It is desirable to print on the curved portion of. This is because the transfer sheet is forcibly separated from the flat screen plate, which enables smooth plate separation (separation between the transfer sheet and the screen plate during printing) and high-quality printing. is there. When a flat screen plate and a flat transfer sheet are used, the plate separation is very poor, and the printed matter has a lot of blemishes and chips, and in particular, it is impossible to print fine thick film fine lines having a width of 100 μm or less.

Furthermore, it is preferable to use a transfer sheet in which a silicone rubber layer is formed on a resin film having a thickness of 100 μm or less. The reason for this is that when a resin film having a thickness of 100 μm or less is used, the transfer sheet itself is flexible and adheres more flexibly to the material to be printed, which allows easy transfer with less deformation. The thicker the silicone rubber layer, the better the printability and transferability on a curved surface. However, in the case of transferring with a small dimensional change, the thickness is preferably thin, particularly 1 mm or less. Further, when a compression layer having elasticity is arranged below the transfer sheet, uneven printing thickness of the transfer sheet and distortion of the silicon-rubber are absorbed, so that more accurate printing can be performed.

For the flat screen plate, it is desirable to use a screen plate having an emulsion thickness of 10 to 30 microns and a screen of 300 ash or more.
This is because, particularly when thin lines with a width of 50 μm or less are printed, since the emulsion film is thick, the ink easily wraps around through the screen mesh, so that it is difficult to disconnect and printing with less variation in printed film thickness is possible. . Further, since the emulsion film thickness is large and the edges of the emulsion are sharp, fine line printing with good linearity is possible.

On the other hand, the offset printing machine of the present invention can perform printing on the transfer sheet in the printing transfer method of the present invention with high quality and easily in mass production. The offset printing machine of the present invention has a configuration in which the squeegee and the cylindrical roller are fixed so as not to move in the horizontal direction, and the flat screen plate is moved horizontally.

Since the cylindrical roller rotates in synchronism with the movement of the screen plate and the transfer sheet is arranged so as to be wound around the side surface of the cylindrical roller, highly accurate printing can be performed. Further, if a mechanism for keeping the distance between the center of rotation of the cylindrical roller around which the transfer sheet is wound and the screen plate and the surface of the material to be printed arbitrarily and constant is provided, the rotation radius of the cylindrical roller changes (circumferential length Change)
Higher precision printing can be performed. Further, by providing a plurality of cylindrical rollers around which the transfer body sheet is wound, it is possible to carry out a plurality of continuous printings.

[0018]

【Example】

(Embodiment 1) Hereinafter, a first embodiment of a print transfer method of the present invention and an offset printing machine of the present invention will be described with reference to the drawings. The ink was kneaded and prepared using a three-roll mill.

The composition of the copper ink used is shown in (Table 1).

[0020]

[Table 1]

The thermoplastic resin used in the above copper ink is a copolymer of isodecyl methacrylate, isobutyl methacrylate and glycidyl methacrylate.
The composition is shown in (Table 2).

[0022]

[Table 2]

FIG. 1 is a block diagram showing the basic functions of an offset printing machine according to the first embodiment of the present invention. Figure 1
, 101 is a squeegee, 102 is an air cylinder, 103 is a screen plate, 104 is a cylindrical roller,
Reference numeral 05 is a transfer sheet, 106 is a compression layer, 107 is an object to be printed, and 108 is an X-axis table. The squeegee 101 moves up and down by the air cylinder 102. The screen plate 103 can be moved in the horizontal direction and is moved by a motor. The screen plate 103 has a flat plate shape. Further, a transfer sheet 105 having a silicone rubber layer of 500 μm thick on 75 μm thick polyethylene terephthalate was wound and fixed on the entire side surface of the cylindrical roller 104 via a compression layer 106. The cylindrical roller 104 includes the screen plate 103 and the X-axis table 10.
It was placed so as to be horizontal with both of No. 8 and No. 8. Cylindrical roller 1
04 can be moved up and down while being fixed to the jig so that the screen plate 103 and the X-axis table 108 are kept parallel to each other.

In the offset printing machine of this embodiment, by moving the screen plate 103, the cylindrical roller 104 rotates in synchronization with this movement. In addition, the cylindrical roller 104 around which the transfer material sheet 105 is wound is attached to the printing target 1
When the X-axis table 108 is moved by pressing it onto 07, the cylindrical roller 104 is rotated, and the ink can be transferred onto the printing medium 107.

As the screen plate 103, a 400 mesh screen plate having an emulsion thickness of 10 μm was used. First, the squeegee 101 is slightly lifted, the prepared copper ink is once spread on the screen plate 103, and then the squeegee 1
While applying the printing pressure with 01, the screen plate 103 was moved to print the copper ink on the silicone rubber of the transfer body sheet 105. The thick film thin line on the silicone rubber had good linearity without the printed lines connecting or breaking each other on the way. Then, immediately transfer sheet 1
The cylindrical roller 104 around which 05 is wound is attached to the print target 107.
The copper ink was transferred onto the object 107 to be printed by pressing it upward and moving the X-axis table 108. The quality of the fine lines on the substrate 107 was good, the line width was 50 microns, and the thickness was about 9 microns. In this case, the printing repeatability was ± 10 μm in the case of 10 samples and 90 mm square. In addition, the copper ink is used as the transfer sheet 105.
Even if it was dried above, by heating the substrate 107 to be printed to about 40 ° C., it was possible to transfer the copper ink fine line having a width of about 50 μm onto the substrate 107 to be printed. The film thickness was about 9 microns.

The method of driving the offset printing machine according to the present invention is not limited to this embodiment, and a cylindrical roller is driven or a heater device for heating the printing medium is added. Alternatively, a function of synchronizing the moving speed of the screen plate and the X-axis table with the rotating speed of the cylindrical roller may be added. Further, the structure of the transfer body sheet is not limited to this embodiment, and may have a multi-layer structure or a transfer body roller.

(Second Embodiment) A second embodiment of the print transfer method of the present invention and the offset printing machine of the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram showing the basic functions of an offset printing machine according to the second embodiment of the present invention. In FIG. 2, 201 is a squeegee and 202
Is an air cylinder, 203 is a screen plate, 205 is a transfer sheet, 207 is an object to be printed, 208 is an X-axis table, and 209 is a guide roller. 3 is a block diagram of the cylindrical roller 204 of the offset printing machine shown in FIG. 2 in this embodiment. In FIG. 3, reference numeral 204 is a cylindrical roller. A transfer body sheet 205 having a silicone rubber layer of 500 μm thick on 75 μm thick polyethylene terephthalate was wound around the entire side surface of the cylindrical roller 204 via a compression layer and fixed in the same manner as in Example 1. In this case, the radius of the transfer sheet 205 from the silicone rubber surface is 30 times larger than the radius of the guide roller 209.
It was increased by about 0 micron. The squeegee 201 moves up and down by the air cylinder 202. Screen version 203
Is movable in the horizontal direction, and is designed to be moved by a motor. The cylindrical roller 204 was arranged so as to be horizontal with both the screen plate 203 and the X-axis table 208. The guide rollers 209 are provided on both sides of the cylindrical roller 204 so as to keep the distance between the surface of the object 207 to be printed and the rotation center of the cylindrical roller 204 constant. The guide roller 209 can always rotate while being in contact with the upper surface of the X-axis table 208 or the surface of the printing target 207 during transfer.
Further, the cylindrical roller 204 can move up and down while being fixed to the jig so as to keep the screen plate 203 and the X-axis table 208 parallel to each other.

In the offset printing machine of this embodiment, by moving the screen plate 203, the cylindrical roller 204 rotates in synchronization with this movement. Further, the cylindrical roller 204 around which the transfer material sheet 205 is wound is attached to the printing target 2
By pressing it against 07 and moving the X-axis table 208, the cylindrical roller 204 is rotated and the ink can be transferred onto the printing target 207.

As the screen plate 203, a 400-mesh flat screen plate having an emulsion thickness of 15 μm was used. First, the squeegee 201 is slightly lifted and the same copper ink as in Example 1 is once spread on the screen plate 203, and then the screen plate 203 is moved while applying a printing pressure by the squeegee 201 so that the silicone rubber of the transfer sheet 205 is transferred. Copper ink was printed on. The thick film thin line on the silicone rubber had good linearity without the printed lines connecting or breaking each other on the way. Next, the cylindrical roller 204 around which the transfer material sheet 205 was wound was immediately pressed onto the printing material 207, and the X-axis table 208 was moved to transfer the copper ink onto the printing material 207. The quality of the fine line on the printing medium 207 was good. The line width was 50 microns and the thickness was about 10 microns. The printing repeatability in this case is 10 samples.
A sheet of 90 mm square was ± 8 microns. Moreover, even if the copper ink is dried on the transfer sheet 205,
By heating No. 7 to about 40 ° C., the copper ink could be transferred onto the material 207 to be printed.

The specific configuration and functions of the offset printing machine of the present invention are not limited to those of this embodiment. For example, a function of synchronizing the moving speed of the screen plate and the X-axis table with the rotating speed of the cylindrical roller may be added, the transfer body sheet may have a multi-layer structure, or the transfer body roller may be used.

(Embodiment 3) A third embodiment of the print transfer method of the present invention and the offset printing machine of the present invention will be described below with reference to the drawings. FIG. 4 is a block diagram showing the basic functions of the offset printing machine according to the third embodiment of the present invention. In FIG. 4, 401 is a squeegee and 402
Is an air cylinder, 403 is a screen plate, 404 is a cylindrical roller, and 405 is a transfer sheet. Squeegee 4
01 is moved up and down by the air cylinder 402. The screen plate 403 can be moved in the horizontal direction, and is moved by a motor. On the cylindrical roller 404, a transfer sheet 405 having a 250-micron silicone rubber layer on a 35-micron thick polyethylene terephthalate was arranged so as to be partially wound. Transfer sheet 40
The end of 5 is wound into a roll.

In this offset printing machine, the screen plate 4
By moving 03, the cylindrical roller 404 rotates in synchronization with this movement. That is, the transfer body sheet 4
The surface of 05 can move in synchronization with the movement of the screen plate 403.

As the screen plate 403, a flat screen plate having an emulsion thickness of 25 microns and 325 mesh was used, and as the ink, the copper ink shown in Example 1 was used. When copper ink is printed on the transfer body sheet 405, printed lines are not connected or cut on the silicone rubber of the transfer body sheet 405 on the way, and a high-quality thick thin film with a width of 30 μm is formed. We were able to. Further, by pressing the transfer sheet 405 on which the ink was printed against the printing medium, it was possible to form a thick film thin line having a width of 30 μm on the printing medium.

The specific construction of the offset printing machine of the present invention is not limited to the offset printing machine of this embodiment, and for example, the screen plate 403 may be provided with a vertical mechanism.

(Embodiment 4) A fourth embodiment of the print transfer method of the present invention will be described below. The inks shown in (Table 3) were prepared and used. The composition of the thermoplastic resin is the same as that shown in Example 1 (Table 2).

[0036]

[Table 3]

The basic structure of the offset printing machine used is the same as in Example 1, except that a screen plate having an emulsion thickness of 25 μm, 300 mesh and a minimum line width of 40 μm is used as a printing plate, and a transfer sheet is 75 A polyethylene terephthalate sheet (Teijin) having a thickness of micron was coated with a silicone adhesive (Toshiba Silicone) using a doctor blade and heat-cured. The thickness of the silicone rubber layer was about 300 μm. This transfer sheet was wound around the side surface of a stainless steel cylindrical roller. still,
A gap of 1 mm was provided between the silicone rubber on the surface of the cylindrical roller and the screen plate.

The ink was printed on the silicone rubber by moving the screen plate while applying a printing pressure with a urethane squeegee.

Immediately after printing, the cylindrical roller around which the transfer sheet was wound was pressed against the printing medium while rotating, and all the copper ink was transferred onto the alumina substrate, which is the printing medium. When this was dried and fired in a nitrogen atmosphere, good copper wiring was obtained. In this case, the printing repeatability was ± 15 microns for 90 samples of 10 samples.

It was also possible to print a 30 micron wide line. Print transfer was possible even with a screen plate having an emulsion thickness of 10 microns, but the printed line width tended to be slightly thicker than designed. On the contrary, when the emulsion thickness was 35 μm, ink clogging was observed. Further, when a resin film having a thickness of 300 μm was used as the transfer sheet, it was necessary to be careful because contact unevenness was likely to occur at the time of transfer to a wavy alumina substrate or the like.

In this embodiment, the screen plate was moved for printing. However, the present invention is not limited to this, and the screen plate is fixed and the transfer sheet and the squeegee are moved for printing. You can do it.

(Embodiment 5) A fifth embodiment of the print transfer method of the present invention will be described below. The basic structure of the offset printing machine used is the same as in Example 1, except that the printing plate has an emulsion thickness of 25 microns, 300 mesh, and a minimum line width of 40.
A micron flat screen plate was used, and a structure having a polyethylene terephthalate layer thickness of 75 microns and a silicone rubber layer thickness of 250 microns was used as the transfer sheet.
A 1 mm gap was provided between the silicone rubber on the surface of the cylindrical roller and the screen plate. The transfer sheet was wound around the side surface of a rotatable stainless steel cylindrical roller. The same copper ink as in Example 4 was used as the ink. The ink was printed on the silicone rubber by moving the screen plate while applying a printing pressure with a squeegee. When the transfer sheet was peeled off and observed, both the vertical and horizontal fine lines had good linearity, and the printed lines were cut in the middle,
The printed lines did not connect to each other. The film thickness of the 40 micron wide line was about 6 microns.

Assuming quality inspection, after leaving for 6 hours, 4
When the transfer sheet was pressed onto the alumina substrate heated to 0 ° C., all the copper ink was transferred onto the alumina substrate. When this was fired in a nitrogen atmosphere, good copper wiring was obtained. It was also possible to print a 30-micron wide line. Print transfer was possible even with a screen plate having an emulsion thickness of 10 microns, but the printed line width tended to be slightly thicker than designed. On the contrary, when the emulsion thickness was 35 μm, ink clogging was observed. Further, when a resin film having a thickness of 300 μm was used as a transfer sheet resin, it was necessary to be careful because uneven adhesion was likely to occur during transfer to a wavy alumina substrate or the like.

In this embodiment, the screen plate was moved for printing. However, the present invention is not limited to this. The screen plate is fixed and the transfer sheet and the squeegee are moved for printing. You can do it.

(Embodiment 6) A sixth embodiment of the print transfer method of the present invention will be described below. The same copper ink as in Example 4 was used as the ink. A glass intaglio plate prepared by wet etching was used as the printing plate. The pattern is a 30 micron wide, 60 micron pitch stripe. For the transfer sheet, a structure having a polyethylene terephthalate layer thickness of 75 μm and a silicone rubber layer thickness of 250 μm was used.

Using a ceramic scraper, the prepared ink was filled in the grooves of the glass intaglio plate, and a stainless steel cylindrical roller wound with a transfer sheet was rotated on the intaglio plate to print a pattern on the silicone rubber. did. Next, the transfer sheet was peeled from the cylindrical roller and the print quality was observed. The linearity of the printed matter was good and the thickness was 4 microns.

After this observation, the ink was almost solidified. Next, the transfer body sheet was pressed on the alumina substrate heated to about 40 ° C. for about 5 seconds, and the transfer body sheet was peeled off.
The width of the printed matter was thicker by several microns, but a stripe without breaks was obtained. This substrate is placed in a nitrogen atmosphere at 900
When fired at ℃, copper wiring showing good continuity was obtained.

(Embodiment 7) A seventh embodiment of the print transfer method of the present invention and the offset printing machine of the present invention will be described below. The offset printing machine of this embodiment has cylindrical protrusions formed at both ends of the cylindrical roller of the offset printing machine shown in the third embodiment. The appearance of the cylindrical roller having the convex portion is the same as that shown in FIG. The convex portion of the cylindrical roller is for providing a gap between the cylindrical roller and the screen plate, and has a height of 1 mm. Further, the convex portion and the screen plate were in contact with each other during printing. In this offset printing machine, by moving the screen plate, the cylindrical roller rotates in synchronization with this movement. That is, the circumference of the convex portion can move in synchronization with the surface of the transfer sheet. In order to increase the frictional force with the screen plate, the convex portion may be roughened, or the screen plate and the convex portion may be geared. A screen plate having an emulsion thickness of 25 μm and 325 mesh was used as the screen plate, and the copper ink shown in Example 4 was used as the ink. When copper ink was printed on the transfer sheet, it was possible to form a thick film fine wire of 30 μm width with good linearity on the silicone rubber of the transfer sheet without any short circuit or disconnection. Further, by pressing the transfer sheet printed with this ink against the printing object, it was possible to form a thick film thin line having a width of 30 μm on the printing object.

The configuration of the offset printing machine of the present invention is not limited to the offset printing machine of this embodiment, and for example, the screen printing plate may be provided with a vertical mechanism to provide a continuous printing function. Further, the type of screen plate, the type of squeegee, etc. are not limited to those in this embodiment.

[0050]

As described above, the printing transfer method of the present invention uses a screen plate to print ink on a transfer body sheet whose outermost layer is made of an elastic body having solvent absorbability and releasability. After that, by transferring the ink from the transfer sheet to the printing medium, or using a printing plate such as a flat screen plate, at least the organic solvent on the transfer sheet whose outermost surface layer is made of silicone rubber. And an ink containing a thermoplastic resin are printed, and thereafter, a printing medium or a transfer medium sheet is heated to transfer the ink from the transfer medium sheet onto the printing medium. More preferably, at least a part of the transfer sheet is wound around the side surface of the cylindrical roller arranged horizontally with the flat screen plate, and is wound around the side surface of the cylindrical roller using a squeegee. Print ink serial transfer sheet, more as a transfer sheet, which thickness was formed a silicone rubber layer on a following resin film 100 microns, from 10 microns emulsion thickness as a printing plate 30
A micron screen having a screen size of 300 ash or more, and a compression layer having elasticity are disposed below the transfer sheet. More preferably, isodecyl methacrylate, isobutyl methacrylate, and glycidyl methacrylate are used as the binder resin for the ink. By using the copolymer with, it is possible to easily form a thick film fine wiring with a width of 30 μm to 100 μm with a narrow wiring pitch and short circuit and disconnection. It is possible to realize a printing transfer method which is excellent in mass productivity.

On the other hand, the offset printing machine of the present invention comprises a flat screen plate which is movable in the plane direction, and a rotation which is positioned below the flat screen plate and is arranged horizontally with the flat screen plate. At least a squeegee that can move up and down, and a plate-shaped screen plate and a print object that are arranged horizontally through a cylindrical roller, and the outermost surface layer is made of silicone rubber. At least a part of the transfer body sheet consisting of is wound around the side surface of the cylindrical roller, and the flat screen plate is moved horizontally while pressing the squeegee against the flat screen plate, whereby the ink is transferred onto the transfer sheet. And a compression layer having elasticity is disposed under the transfer sheet, and further, the transfer sheet is Guide rollers for keeping the distance between the center of rotation of the cylindrical roller and the plate-shaped screen plate, and the distance between the center of rotation of the cylindrical roller and the surface of the printing medium to be arbitrary and constant. By providing the la, the wiring pitch is narrow, and the thick film fine wiring with a line width of 30 to 100 microns can be obtained with good quality.
It is possible to realize an offset printing machine that can be easily formed and has excellent mass productivity.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing basic printing functions of an offset printing machine in a first embodiment of the offset printing machine of the present invention.

FIG. 2 is a configuration diagram showing basic functions of an offset printing machine in a second embodiment of the offset printing machine of the present invention.

FIG. 3 is a configuration diagram of a cylindrical roller portion in a second embodiment of the offset printing machine of the present invention.

FIG. 4 is a configuration diagram showing basic functions of an offset printing machine in a third embodiment of the offset printing machine of the present invention.

[Explanation of symbols]

 101, 201, 401 Squeegee 102, 202, 402 Air cylinder 103, 203, 403 Screen plate 104, 404 Cylindrical roller 105, 205, 405 Transfer body sheet 106 Compression layer 107, 207 Printed body 108, 208 X-axis table 209 Guide roller

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical indication H05K 3/20 C 7511-4E

Claims (14)

[Claims] 1. Using a screen plate, ink is printed on a transfer sheet which is arranged on a curved surface and whose outermost surface layer is made of an elastic body having solvent absorbability and releasability. After that, the above-mentioned ink is transferred from the above-mentioned transfer body sheet onto a printing medium, and a printing transfer method characterized by the above-mentioned. 2. A transfer roller sheet is wound around at least a part of a side surface of a cylindrical roller which is horizontally fixed to a flat screen plate, and the flat screen plate is placed on the cylindrical roller by using a squeegee. Ink is printed on the transfer sheet by moving the flat screen plate in a horizontal direction while applying pressure to the side surface, and thereafter, the ink is printed on the transfer sheet from the transfer sheet. A printing transfer method characterized by transferring ink. 3. The print transfer method according to claim 2, wherein the transfer sheet has an outermost surface layer made of silicone rubber. 4. A printing plate on which a predetermined pattern is formed is used to print an ink containing at least an organic solvent and a thermoplastic resin on a transfer sheet having an outermost surface layer made of silicone rubber, and thereafter, A printing transfer method comprising heating a material to be printed to transfer the ink from the transfer sheet onto the material to be printed. 5. A transfer sheet having an outermost surface layer made of silicone rubber on at least one side surface of a cylindrical roller horizontally fixed to a flat screen screen having a predetermined pattern formed thereon. Partial winding, using the squeegee, the flat screen
An ink containing at least an organic solvent and a thermoplastic resin on the transfer body sheet by moving the flat screen screen in the horizontal direction while applying pressure to the side surface of the cylindrical roller. Is printed, and then the printing medium is heated to transfer the ink from the transfer sheet to the printing medium. 6. The print transfer method according to claim 4 or 5, wherein the thermoplastic resin comprises a copolymer of isodecyl methacrylate, isobutyl methacrylate and glycidyl methacrylate. 7. The print transfer method according to claim 2, wherein the transfer sheet is wound around a cylindrical roller via a compression layer having elasticity. 8. The transfer sheet is formed by forming a silicone rubber layer on a resin film having a thickness of 100 μm or less, according to any one of claims 1, 2, 4, 5, 6, and 7. The print transfer method described in. 9. The printing plate according to claim 1, wherein the printing plate is a flat screen plate having an emulsion thickness of 10 to 30 μm and a screen of 300 mesh or more. Transfer method. 10. A flat screen plate which is movable in the plane direction, a rotatable cylindrical roller which is located below the flat screen plate and which is arranged horizontally with the flat screen plate, At least a vertically movable squeegee for printing a flat screen plate on the cylindrical roller, and an object to be printed arranged horizontally with the flat screen plate through the cylindrical roller. The cylindrical roller is configured by winding a transfer sheet having an outermost surface layer made of silicone rubber around the side surface of the cylindrical roller, and horizontally moving while pressing the screen plate using the squeegee. By doing so, an ink is printed on the transfer sheet, and the ink is transferred to the printing medium. 11. The offset printing machine according to claim 10, wherein a compression layer having elasticity is provided below the transfer sheet. 12. A distance between a rotation center of a cylindrical roller around which a transfer sheet is wound and a flat screen plate, and a distance between a rotation center of the cylindrical roller and a surface of a printing medium are defined by
12. An offset printing machine according to claim 10 or 11, characterized in that guide rollers are provided at both ends of the cylindrical roller so as to keep them arbitrarily and constant. 13. The guide roller has the same axis as the rotation axis of the cylindrical roller and is composed of a cylindrical convex portion having a diameter larger than the diameter of the cylindrical roller. 13. The offset printing machine according to claim 12, characterized in that it has a cylindrical convex portion having a height of 2 mm or less, which is a gap with the flat screen plate at both ends. 14. A plurality of cylindrical rollers provided with a transfer sheet are provided.
13. The offset printing machine according to any one of 13.