JPH06286106A - Pattern printing method and pattern printer used therefor - Google Patents

Abstract

PURPOSE:To provide a pattern printer by which a wiring pitch is narrowed and wiring of a fine thick film wiring having width of <=100mum is printing cost is reduced in printing on an irregular surface and in manufacture of a ceramic multilayer substrate. CONSTITUTION:A pattern printer is equipped with a rotary screen cylinder 1, a silicon rubber transfer roller 2 made of an elastic body whose outermost surface layer has solvent absorptivity and mold release properties, a heating roller 3 for heating the transfer roller 2 and cooling rollers 4 for cooling the transfer roller 2. A pattern of a fine thick film is continuously printed at excellent mass-productivity by such constitution that the transfer roller 2 is once printed with ink 7 and thereafter ink 7 is transferred on a beltlike body 9 to be printed.

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 printing technique for forming fine thick film wiring such as a ceramic multilayer substrate by printing, and more particularly to a pattern printing method using transfer and a pattern printing machine used therefor.

[0002]

2. Description of the Related Art With the recent miniaturization and high speed of electronic devices, it is required to increase the number of layers and the density of circuit boards used therein. In order to realize this, researches have been conducted on miniaturizing wiring of a circuit board and reducing the dielectric constant of a board material. In these respects, for example, a ceramic substrate has a relatively small ε and is easy to be multilayered, so that it is used in a characteristic portion as a small module component or a high frequency component.

Conventionally, a ceramic multilayer substrate has a via hole formed on a green sheet before firing, which mainly contains ceramic powder and a resin binder called a green sheet, and the most common screen printing is performed on each green sheet. The circuit pattern is printed by using the method, and then these are laminated and fired to manufacture.

[0004]

However, the conventional ceramic multi-layer substrate is relatively expensive compared to the resin substrate because it cannot be manufactured in a large area, the material cost is high, and the printing process is many. There is. The conventional screen printing method is a single process, and in the production of the ceramic multilayer substrate, each green sheet is exchanged one by one, so there is a waste of time, the printed wiring is blurred, and the pattern is printed once. The second printing on a green sheet or a sintered substrate having such a step has a problem that the wiring is likely to be short-circuited and only one side can be printed at a time, which lowers productivity and quality.

The present invention solves the problems of the above-mentioned conventional printing method. It is possible to print fine thick film wiring having a narrow wiring pitch and a width of 100 μm or less with good quality and mass productivity. An object of the present invention is to provide a pattern printing method capable of reducing printing costs such as printing on the upper surface and manufacturing of a ceramic multilayer substrate, and a pattern printing machine used for the method.

[0006]

According to the present invention, ink is printed on a transfer roller by bringing a rotary screen plate into contact with a transfer roller whose outermost layer is made of an elastic material having solvent absorption and releasability. After that, the ink is transferred from the transfer body onto the printing medium.

Further, the present invention has at least a step of directly or indirectly heating the transfer roller and a step of directly or indirectly cooling the transfer roller thereafter.

Further, according to the present invention, a rotary screen plate, a transfer roller whose outermost surface layer is made of an elastic material having solvent absorbability and releasability, a heating means for heating the transfer roller, and a cooling for the transfer roller. And at least a cooling means.

Further, according to the present invention, a rotary screen plate, a transfer roller whose outermost surface layer is made of an elastic material having solvent absorption and releasability, heating means for heating the transfer roller, and cooling the transfer roller. It has at least a three-dimensional moving device which is provided with a cooling means and moves and moves all together as a unit.

Further, according to the present invention, a rotary screen plate, a transfer roller whose outermost surface layer is made of an elastic material having solvent absorption and releasability, heating means for heating the transfer roller, and cooling the transfer roller. At least a cooling unit and an impression cylinder arranged with respect to the transfer roller so as to sandwich the belt-shaped or continuously conveyed printing medium are provided.

Further, according to the present invention, a rotary screen plate is provided on both sides of a belt-shaped or continuously conveyed printing medium, and a transfer roller having an outermost surface layer made of an elastic body having solvent absorbability and releasability. At least a heating means for heating the transfer roller and a cooling means for cooling the transfer roller are provided, and both surfaces of the printing medium are arranged so as to be sandwiched between the two transfer rollers.

Further, according to the present invention, the heating means for heating the transfer roller is a heat roller in contact with the transfer roller, and the cooling means for cooling the transfer roller is a low temperature roller in contact with the transfer roller.

[0013]

In the pattern printing method of the present invention, for example, when a transfer roller having the outermost layer made of silicone rubber is used, the silicone rubber absorbs the solvent, so that 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. Furthermore, when printing is performed by bringing the silicone rubber and the rotary screen plate into contact with each other, bleeding of printed wiring can be reduced. When the solvent is properly absorbed, the silicone rubber is pressed against the material to be printed, and 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.

Since the rotary screen plate and the transfer roller can rotate at all times, continuous high-speed printing is possible.

By heating the surface of the transfer roller, swelling of the silicone rubber due to the solvent can be removed, and by cooling the transfer roller, residual heat of the transfer roller can be removed. By forming the heating means and the cooling means in a roller shape, it is possible to better cope with high-speed printing.

In the pattern printing machine of the present invention, the rotary screen plate and the transfer roller are integrally moved and moved up and down three-dimensionally so that a fine thick film printing can be performed at an arbitrary position like a pen, or a pressure printing can be performed. It is possible to improve the quality by including the cylinder and disposing the sheet-shaped material to be printed between the transfer roller and the impression cylinder. Alternatively, by arranging a series of devices such as a rotary screen plate and a transfer roller on both sides of the belt-shaped printing medium, pattern printing can be performed simultaneously on both sides and continuously.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) The structure of the pattern printing method of the present invention and the first embodiment of the pattern printing machine of the present invention will be described together with its operation. Copper powder, glass frit, organic binder, and organic solvent were kneaded using a three-roll mill to prepare a copper ink. The organic binder used for the copper ink is a copolymer of isodecyl methacrylate, isobutyl methacrylate and glycidyl methacrylate and has adhesiveness. FIG. 1 is a block diagram showing the basic functions of the pattern printing machine according to the first embodiment of the present invention. In FIG. 1, 1 is a rotary screen plate, 2 is a transfer roller, 3 is a heat roller, 4 is a low temperature roller, 5 is an object to be printed, 6
Is a squeegee and 7 is an ink. A stripe pattern having a width of 100 μm is formed on the rotary screen plate 1, and the material to be printed 5 is an alumina substrate. A silicone rubber layer having a JIS hardness of 32 degrees was formed on the surface of the transfer roller 2, and the transfer roller 2 and the rotary screen plate 1 were brought into contact with each other for printing. The rotary screen plate 1 excluding the material to be printed 5, the transfer roller 2, the heat roller 3, the low temperature roller 4, the squeegee 6, and the ink 7 are integrated, and these are moved back and forth, left and right, and up and down by a three-dimensional axis robot. It was Also, rotary screen version 1
The contact between the transfer roller 2 and the transfer roller 2 can be manually adjusted. The rotary screen plate 1, the heat roller 3 and the low temperature roller 4 were rotated by friction at the same time as the transfer roller 2 was brought into contact with the printing medium 5 and rotated. The heat roller 3 and the low temperature roller 4 were brought into contact with the transfer roller 2 at the start of printing.

Next, the transfer roller 2 was moved to a position where printing was desired by a three-dimensional axis robot, and the transfer roller 2 was lowered onto the material 5 to be printed and brought into contact with it under a printing pressure. Next, the transfer roller 2 was rotated using a three-dimensional axis robot. At this time, the stripe pattern was once printed from the rotary screen plate 1 onto the transfer roller 2, and then all the stripe pattern on the transfer roller was transferred onto the printing medium 5. Printing could be done continuously and at any position. The pattern on the printing medium 5 was a stripe pattern having a width of about 98 μm, and no disconnection or bleeding was observed. Further, it was possible to perform high-quality printing without bleeding even on the alumina substrate on which the glass layer was partially formed.

The detailed structure of the pattern printing machine of the present invention, the heating and cooling method, etc. are not limited to those in this embodiment, and for example, the rotary screen plate 1, the transfer roller 2, the heat roller 3, the low temperature may be used. The rotation drive control may be performed so that all the rollers 4 and the like are independent and synchronized.

(Embodiment 2) The pattern printing method of the present invention and the configuration of the second embodiment of the pattern printing machine of the present invention will be described below together with the operation. Copper powder, glass frit, organic binder, and organic solvent were kneaded using a three-roll mill to prepare a copper ink. The organic binder used for copper ink is a copolymer of isodecyl methacrylate, isobutyl methacrylate and glycidyl methacrylate,
Has adhesiveness. FIG. 2 is a block diagram showing the basic functions of the pattern printing machine according to the second embodiment of the present invention. In FIG. 2, 1 is a rotary screen plate, 2 is a transfer roller, 3 is a heat roller, 4 is a low temperature roller, 6 is a squeegee, 7 is ink, 8 is an impression cylinder, and 9 is a green sheet. The impression cylinder 8 is made of Duracon. On the rotary screen plate 1, a circuit pattern including a line having a width of 100 μm was formed. A silicone rubber layer having a JIS A hardness of 32 degrees is formed on the surface of the transfer roller 2. A belt-shaped green sheet 9 was sandwiched between the transfer roller 2 and the impression cylinder 8, and printing pressure was applied. The green sheet 9 is formed on a polyethylene terephthalate film (PET).

When the transfer roller 2 was rotated using a servo motor, the circuit pattern formed on the rotary screen plate 1 was printed on the green sheet 9 with good quality. Printing could be done at a speed of 30 centimeters per second. After the printing, the green sheet 9 was cut, the PET was peeled off, and the layers were laminated and fired. As a result, a ceramic substrate having no disconnection was obtained.

The detailed construction of the pattern printing machine of the present invention, the heating and cooling method, etc. are not limited to those in this embodiment. For example, the impression cylinder 8 may be made of rubber or stainless steel. The rotary screen plate 1, the heat roller 3, the low temperature roller 4, the impression cylinder 8 and the like may all be controlled to rotate independently and in synchronization.

(Embodiment 3) A pattern printing method according to the present invention and a structure of a pattern printing machine according to a third embodiment of the present invention will be described together with its operation. Copper powder, glass frit, organic binder, and organic solvent were kneaded using a three-roll mill to prepare a copper ink. The organic binder used for copper ink is a copolymer of isodecyl methacrylate, isobutyl methacrylate and glycidyl methacrylate,
Has adhesiveness. FIG. 3 is a block diagram showing the basic functions of the pattern printing machine according to the third embodiment of the present invention. In FIG. 3, 1 is a rotary screen plate, 2 is a transfer roller, 3 is a heat roller, 4 is a low temperature roller, 6 is a squeegee, 7 is ink, and 9 is a green sheet. On the rotary screen plate 1, a circuit pattern including a line having a width of 100 μm was formed. J on the surface of the transfer roller 2
A silicone rubber layer having an ISA hardness of 32 degrees is formed. A belt-shaped green sheet 9 was sandwiched between the pair of transfer rollers 2, and printing pressure was applied.

When both transfer rollers 2 were synchronously rotated by using a servo motor, the circuit pattern formed on the rotary screen plate 1 was printed on both sides of the green sheet 9 with good quality. Printing could be done at a speed of 30 centimeters per second.

The detailed structure of the pattern printing machine of the present invention, the heating and cooling method, etc. are not limited to those in this embodiment, and for example, the rotary screen plate 1, the heat roller 3, the low temperature roller 4, the pressure roller, etc. The body 8 and the like may be rotationally controlled so that they are all independent and synchronized.

[0027]

As is apparent from the above description,
INDUSTRIAL APPLICABILITY The present invention is capable of printing fine thick film wiring having a narrow wiring pitch and a width of 100 μm or less with good quality and mass productivity, and further reducing printing cost for printing on uneven surfaces and manufacturing of ceramic multilayer substrates. It is possible to realize a pattern printing method capable of performing the above and a pattern printing machine used therefor.

[Brief description of drawings]

FIG. 1 is a front view showing a basic configuration of a first embodiment of a pattern printing machine of the present invention.

FIG. 2 is a front view showing the basic configuration of a second embodiment of the pattern printing machine of the present invention.

FIG. 3 is a front view showing the basic configuration of a third embodiment of the pattern printing machine of the present invention.

[Explanation of symbols]

 1 Rotary Screen Plate 2 Transfer Roller 3 Heat Roller 4 Low Temperature Roller 5 Print Substrate 6 Squeegee 7 Ink 8 Impressor 9 Green Sheet

Claims (7)

[Claims] 1. A rotary screen plate is brought into contact with a transfer roller whose outermost surface layer is made of an elastic material having solvent absorbability and releasability, and ink is printed on the transfer roller by the rotary screen plate. Then, the pattern printing method, wherein the ink is transferred from the transfer member onto a printing target. 2. The pattern printing method according to claim 1, further comprising the step of directly or indirectly heating the transfer roller and then directly or indirectly cooling the transfer roller. 3. A rotary screen plate, a transfer roller whose outermost surface layer is made of an elastic material having solvent absorbability and releasability, heating means for heating the transfer roller, and cooling means for cooling the transfer roller. A pattern printing machine characterized by having and. 4. The heating means for heating the transfer roller is a heat roller in contact with the transfer roller, and the cooling means for cooling the transfer roller is a low temperature roller in contact with the transfer roller. Item 3. The pattern printing machine according to Item 3. 5. A rotary screen plate, a transfer roller whose outermost surface layer is made of an elastic material having solvent absorbability and releasability, heating means for heating the transfer roller, and cooling means for cooling the transfer roller. And a three-dimensional moving device that integrally moves and moves the rotary screen plate, the transfer roller, the heating unit, and the cooling unit. 6. A rotary screen plate, a transfer roller whose outermost surface layer is made of an elastic material having solvent absorbability and releasability, heating means for heating the transfer roller, and cooling means for cooling the transfer roller. And a pressure drum arranged so as to sandwich a belt-shaped or continuously conveyed printing medium with respect to the transfer roller. 7. A rotary screen plate, a transfer roller formed of an elastic body having an outermost surface layer having solvent absorbability and releasability, and heating means for heating the transfer roller, on both sides of the sheet-shaped material to be printed. And a cooling unit that cools the transfer roller, and both sides of the sheet-shaped material to be printed are sandwiched between the two transfer rollers.