JP6024085B2 - Printing plate manufacturing method, printing method, and printing plate in gravure offset printing - Google Patents

Description

The present invention relates to a printing plate manufacturing method, printing method, and printing plate in gravure offset printing that prints various high-viscosity coating materials such as various inks, resins, and conductive pastes on the surface of a printing object. The present invention relates to a printing plate manufacturing method, a printing method, and a printing plate for stably printing an excellent image having high resolution and high dimensional accuracy over a wide range. Specifically, for example, polyethylene terephthalate (PET), polyethylene naphthalate for printing IC card antenna (coiled pattern), solar cell backsheet conductive wiring, electromagnetic shield, touch panel ITO (indium tin oxide) wiring, etc. (PEN) relates to a printing plate manufacturing method, printing method, and printing plate in gravure offset printing that can be used for printing high-thin lines in a wide area with conductive ink, conductive paste, and the like on a sheet of acrylic, etc. .

  In recent years, the gravure offset printing method has been used as a manufacturing method for industrial products in various fields such as the building materials field, the packaging field, the publishing field, and the electronics field. In this gravure offset printing method, first, an ink made of silicone, a fluorine compound, or a mixture thereof is placed on a plate in which a desired ink is inserted and scraped into a concave pattern with a doctor or a scraper to fill the concave pattern with ink. A process of patterning an ink film on a transfer body by bringing a transfer body having a peelable transfer layer on the surface into contact with the transfer body and transferring the ink film onto the transfer body, and an ink film corresponding to an appropriate film thickness distribution A step of forming, and a step of pressure-bonding and rolling the transfer body to the printing body, and transferring a pattern of an ink film on the transfer body to the printing body. And when printing materials with high viscosity, such as various inks, resins, and conductive pastes, are printed on the surface of the printing object using this type of transfer printing method, it prints over a wide range with high resolution and high dimensional accuracy. It is required to be able to do it.

In order to meet these requirements, the gravure offset printing method is required to have the following functions [1] to [3].
[1] To enable uniform and stable high-definition fine line printing over a wide area.
[2] The fine line printed on the print object should not be disconnected or short-circuited.
[3] A thin line with a stable film thickness can be printed.

  For mass production, it is necessary to reliably transfer the ink filled in a desired concave pattern in the same shape onto a transfer body having an ink-peelable transfer layer.

  In order to form a uniform, stable, unbroken fine line pattern over a wide area, when the ink is inserted and scraped into the concave pattern of the plate with a doctor or squeegee, the ink surface filled in the concave pattern is smooth. Thus, when pressure-bonding with a transfer body having an ink-peelable transfer layer, it is necessary that the ink surface be in uniform contact with the transfer body.

However, until now, when ink is inserted and scraped into the concave pattern of the plate with a doctor or squeegee, the ink surface is filled in the concave pattern by pulling the ink at the tip of the doctor or squeegee. In most cases, the surface was lower than the scraped surface.
For this reason, when a transfer body having an ink-peelable transfer layer is pressure-bonded onto the concave pattern of the plate while applying pressure, depending on the shape of the pattern, the ink surface in the concave pattern becomes lower than the scraped surface, and the ink An air pocket is generated between the transfer member having the peelable transfer layer and the air in the air pool is lost. As a result, sometimes the air compressed in the air pool has an ink peeling property. As a result of explosive ejection from a slight gap between the transfer body having the transfer layer and the scraping surface, a phenomenon occurs in which ink is also ejected. In addition, even when the air compressed in the air pool remains without exploding, only the air moves within the pattern, and the ink does not transfer well to the transfer body having a peelable transfer layer, resulting in disconnection, etc. It might have caused the cause.

  Therefore, the inventor reliably and evenly transfers the ink filled in a desired concave pattern to a transfer body having an ink-peelable transfer layer without causing such a phenomenon. In addition, in order to stably transfer the ink film pattern on the transfer body to the printing body by pressure-bonding the transfer body to the printing body, and to enable fine lines of film thickness, We paid attention to the need to devise the air easily escaped to the glass plate and metal plate forming the pattern.

  In the gravure offset printing method, when the ink is inserted and scraped into the desired concave pattern with a doctor or scraper, the drop of the doctor or scraper and the negative pressure generated when passing over the concave pattern, molecules such as doctor or scraper, etc. It was found that the ink surface to be filled in the concave pattern is pulled up by the thinning force, and the ink to remain in the concave pattern is taken away by a doctor or a scraper, and the ink surface level of the concave pattern is lowered. In addition, depending on the ink viscosity and elastic properties, a part of the concave pattern may be depressed without being leveled, resulting in a depressed state, the ink surface is not smooth, and the ink is the next step. The transfer to a transfer body having a peelable transfer layer becomes insufficient, causing a problem of disconnection. For this phenomenon, measures have been taken by changing the material of the doctor or scraper as a means of reducing air accumulation without lowering the level of the ink scraping surface, but this has not been improved depending on the pattern. However, there is a disadvantage that the problem becomes remarkable particularly when printing a high-definition line or a thin line with a high film thickness.

Japanese Patent Laid-Open No. 55-5856

The present invention has been made in order to solve the problem of bubbles generated in the conventional gravure offset printing technology. The purpose of the present invention is to make a printing material such as a high-viscosity resin uniform and stable. Another object of the present invention is to provide a printing plate manufacturing method, a printing method, and a printing plate in gravure offset printing for modifying a plate shape capable of printing a fine line with a high film thickness.

In order to solve the above problems, the invention of claim 1 is a method of manufacturing a printing plate for gravure offset printing having a concave pattern on a plate surface, and a printing material and a transfer body in a concave pattern at an edge of the concave pattern. The method for producing a printing plate for gravure offset printing is characterized in that a passage for extracting the air remaining between the concave portion pattern region and the edge portion is formed by selectively performing a concave and convex process.
Invention of Claim 2 is a manufacturing method of the printing plate for gravure offset printing provided with a concave pattern in a printing plate, Comprising: The air which remains between the printing material and transfer body in a concave pattern is recessed on the edge part of the said concave pattern. In the manufacturing method of a printing plate for gravure offset printing, a passage for extracting from a pattern region is formed by performing fine grainy uneven processing on the edge portion.
The invention of claim 3 is a printing method characterized in that a fine line pattern is formed using the gravure offset printing plate produced by the method for producing a gravure offset printing plate according to claim 1 or 2. is there.
The invention of claim 4 is a printing plate for gravure offset printing having a concave pattern on the plate surface, and has an edge portion of the concave pattern having a plurality of chips. .
The invention of claim 5 is a printing plate for gravure offset printing having a concave pattern on the plate surface, and has an edge portion of the concave pattern having an unevenness of 0.01 to 0.1 microns. This is a printing plate for offset printing.

According to the present invention, a high viscosity resin can be stably printed with high fine lines by a gravure offset printing method using an intaglio plate subjected to blasting.
In addition, according to the present invention, high-thin lines can be stably printed. For example, when a wiring pattern of an electronic circuit is printed, a resistance value that is an index indicating the conductivity of each wiring pattern is obtained. Variations can be reduced and occurrence of disconnection can be suppressed.

  In addition, it has become easy to replace a metallic circuit, which has been conventionally formed by an etching method, with conductive ink or conductive paste.

It is the external appearance schematic of the existing gravure offset printing machine. It is the schematic of the existing gravure offset printing system. It is the process schematic diagram performed on the surface plate which fixed the intaglio of the existing gravure offset printing system. It is the process schematic diagram performed on the surface plate which fixed the intaglio of the existing gravure offset printing system. It is the process schematic diagram performed on the surface plate which fixed the intaglio of the existing gravure offset printing system. It is the process schematic shown on the intaglio of the existing gravure offset printing system. It is the process schematic shown on the intaglio of the existing gravure offset printing system. It is the process schematic shown on the intaglio of the existing gravure offset printing system. It is the process schematic shown on the intaglio of the existing gravure offset printing system. It is the process schematic shown on the intaglio of the existing gravure offset printing system. It is the process schematic shown on the intaglio of the existing gravure offset printing system. It is the process schematic performed on the to-be-printed body of the existing gravure offset printing system. It is the schematic which shows the problem which generate | occur | produces on the to-be-printed body of the existing gravure offset printing system. It is the schematic which shows the state by which the air was compressed by the high voltage | pressure in the process performed on the intaglio of the existing gravure offset printing system. It is the schematic which represented the state which moved in the pattern on the intaglio of the existing gravure offset printing system, finally lost the place where air escapes, and was in a high-pressure state with a radial arrow. It is the schematic which shows the problem which generate | occur | produces on the intaglio of the existing gravure offset printing system. It is the schematic which modeled a part of intaglio pattern of the existing gravure offset printing system. FIG. 3 is a schematic view showing a gravure offset printing intaglio according to the present invention, in which corners of a concave pattern portion are selectively cut out by a blasting method. It is the schematic which showed what formed the fine unevenness | corrugation in the whole surface by the blasting method with the intaglio of the gravure offset printing system in embodiment of this invention. It is the schematic which showed what made the state where the corner | angular part of the recessed part pattern became smooth by the blast processing method or the etching processing method with the intaglio of the gravure offset printing system in embodiment of this invention. It is the schematic which showed the effect acquired by using the recessed part pattern in embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 schematically shows a gravure offset printing apparatus known as a gravure offset printing method. This gravure offset printing apparatus is a concave part having a width of 10 μm to several mm and a depth of about 5 to 20 μm by multiple etching, laser, electroforming, etc. on a glass or metal flat plate, which is also used in an existing gravure offset printing method. An intaglio 102 engraved with a pattern 101 is provided, and the intaglio 102 is fixed on a surface plate 103. A steel or resin doctor or squeegee 104 is provided to insert and scrape the ink 110 such as a conductive paste or resin into the recess pattern 101 of the intaglio plate 102. Further, the gravure offset printing apparatus has an ink releasability having a transfer layer in a cylindrical shape that allows the ink 110 filled in the concave pattern 101 to be stably removed while being rolled at a constant pressure. In order to print the transfer body 105 and the ink film 106 remaining on the transfer body 105 by the separation of the ink 110 on the printing body 107, the fixed body 103 is fixed to the surface plate 103 that fixes the intaglio plate 102. Board 108.

  Then, the ink-peeling transfer member 105 is moved to the surface plate 108 side, and the transfer member 105 is rolled onto the substrate 107, and the ink film 106 remaining on the transfer member 105 is pressed with a certain pressure. To print on. Therefore, the printed material 107 is printed in the same shape as the concave pattern 101, which becomes the fine line pattern 109 shown in FIG.

  FIG. 2 shows a process of printing on the printing medium 107 in the manner of rolling the ink-peelable transfer body 105 from the right to the left of the gravure offset printing apparatus shown in FIG. 1 when viewed from the side. . That is, in this gravure offset printing apparatus, the transfer body 105 is rolled on the intaglio plate 102, and the ink 110 such as a conductive paste or resin previously inserted and scraped into the recess pattern 101 of the intaglio plate 102 by a doctor or squeegee 104 is removed by ink. The transfer film 105 is transferred onto the printing medium 107, and then the ink film 106 of the transfer body 105 is transferred onto the printing medium 107.

  FIG. 3 is a schematic explanatory view specifically showing the ink insertion and scraping process performed on the surface plate on which the intaglio 102 of the existing gravure offset printing method on the right side in FIG. 2 is fixed. As shown in FIG. 3, the doctor or squeegee 104 moves from the left to the right in the drawing on the surface of the intaglio plate 102 fixed on the surface plate 103, and the ink 110 is inserted into the indentation pattern 101 carved in the intaglio plate 102. Scrape along with.

  FIG. 4 shows a state after the end of the ink insertion scraping process shown in FIG. 3, and the ink 110 is inserted into the concave pattern 101 by scraping. At this time, the ink 110 is applied to the surface of the intaglio plate 102 other than the concave pattern 101. There is almost no remaining.

  FIG. 5 shows that after the process shown in FIG. 4, the ink-peelable transfer body 105 is rolled from the right side to the left side of the intaglio plate 102 with a certain pressure applied to the inside of the concave pattern 101. 4 shows a process in which the ink 110 inserted into the ink peels off from the intaglio plate 102 and becomes an ink film 106 remaining on the ink-peelable transfer member.

  FIG. 6 shows the action that occurs in the process shown in FIG. That is, the states of the concave pattern 101 portion of the intaglio plate 102, the doctor or squeegee 104 in contact with the surface of the intaglio plate 102 at a certain angle and pressure, and the portion of the ink 110 injected to the traveling direction side of the doctor or squeegee 104 are enlarged. It shows.

  FIG. 7 shows a state in which the doctor or squeegee 104 is passing over the concave pattern 101 when the doctor or squeegee 104 is moved from the left side to the right side in the drawing from the state shown in FIG. In this state, a part of the ink 110 wraps around the front end portion 701 of the doctor or squeegee and is attached to the front end portion 701.

  FIG. 8 shows a state immediately after the doctor or squeegee 104 passes over the concave pattern 101 of the intaglio plate 102 from the state shown in FIG. 7 to the right side of the drawing, and a part of the ink 110 is doctor. Alternatively, the ink 110 clings to the tip 701 of the squeegee 104 and a part of the ink 110 is removed from the concave pattern 101 by the intermolecular force of the ink 110 itself, the negative pressure generated by the movement of the doctor or the squeegee 104, or the intermolecular attractive force. As a result, a portion 801 in which a part of the liquid surface of the ink 110 filled in the concave pattern 101 is greatly depressed is shown.

  FIG. 9 shows a state after the doctor or squeegee 104 has moved away from the state shown in FIG. 8 to the right side in the drawing, and the ink 110 left in the concave pattern 101 of the intaglio plate 102 is the ink 110. The ink 901 accumulated in the vicinity of the recessed portion 801 without leveling due to its high viscosity, and the ink 901 overflowing out of the recess pattern 101 is left on the surface of the intaglio plate 102.

  FIG. 10 shows a state in which the ink-peelable transfer body 105 comes into contact with the ink 110 accumulated in the concave pattern 101 of the intaglio 102 on the intaglio 102 in the state shown in FIG. Is shown. In this case, although the transfer body 105 is in contact with the ink 110 accumulated in the recess pattern 101, the presence of the recessed portion 801 in the ink 110 accumulated in the recess pattern 101 causes the ink peelable transfer body 105 and A portion that cannot be in close contact with the ink 110 is generated. This part that cannot be brought into close contact with the transfer body 105 is in a hollow state with a strong air pressure. FIG. 10 shows that this strongly pneumatic cavity condition has occurred.

  FIG. 11 shows a state where the ink peelable transfer body 105 is separated from the intaglio plate 102 and the ink 110 that has been accumulated in the concave pattern 101 is peeled from the concave pattern 101 from the state shown in FIG. The remaining ink film 106 and the ink 901 overflowing to the outside of the concave pattern 101 also shows the ink film 1201 outside the pattern remaining on the ink-peelable transfer body 105. In this state, even the ink film 1201 outside the pattern remaining on the transfer body is transferred to the printing medium 107, which causes printing as an abnormal pattern.

  FIG. 12 shows the abnormal state, that is, the ink film 106 remaining on the transfer body transferred to the ink-peelable transfer body 105 shown in FIG. 11 and the ink film 1201 outside the pattern remaining on the transfer body. The state which contact | adhered to the body 107 with fixed pressure is shown.

  In FIG. 13, the ink-peelable transfer body 105 is separated from the state shown in FIG. 12, and the ink film 106 remaining on the transfer body and the ink film 1201 outside the pattern remaining on the transfer body on the printing medium 107 in the state shown in FIG. Indicates an abnormal printing state in which a printed pattern 1301 is obtained.

  As described above, when printing is performed by the existing gravure offset printing method, the cross-sectional shape of the printed pattern 1301 transferred onto the printing medium 107 leaves the shape of the depressed portion 801. The ink 110 is not printed on the printing medium 107 at all, causing disconnection or the like.

  FIG. 14 shows a situation similar to that shown in FIG. 10, but shows a state in which pressure is applied to the recessed portion 801 by the ink-peelable transfer body 105, Air that has been compressed to a high pressure remains in the recessed portion 801.

  Further, the depressed portion 801 shown in FIG. 14 moves in the pattern, eventually loses the place for air to escape, and remains as high-pressure air. FIG. 15 shows this state, and the direction of high pressure is radial as indicated by the arrows in FIG.

  FIG. 16 shows that at the moment when the ink-peelable transfer member 105 moves slightly to the right side in the figure, the residual air compressed from the gap formed slightly on the left side in the figure explodes instantly and is ejected. The state of the ink 111 is shown.

  FIG. 17 is a schematic view simulating a part of an intaglio pattern of an intaglio plate 102 for gravure offset printing that is normally used. The intaglio plate 102 can be formed on a material such as glass or metal by laser or etching.

Next, an embodiment of an intaglio plate as a printing plate for gravure offset printing according to the present invention will be described. In this intaglio plate for gravure offset printing, a concavo-convex portion for generating air leakage is applied to the edge portion of the concave pattern. As will be described later, this uneven portion processed portion forms a passage for extracting air from the uneven portion, and the air remaining between the ink and the transfer body in the concave pattern is extracted from the region of the concave pattern or excessive air. The air pressure can be reduced. Here, the edge portion of the recess pattern refers to a corner portion formed by the surface of the intaglio in contact with the ink-peelable transfer member and the inner side surface of the recess pattern 101.
In addition, examples of the concavo-convex processing method include a blast processing method, an etching processing method, and the like, but the processing method is not limited as long as the concavo-convex processing can be performed on the edge portion of the concave pattern.

  FIG. 18 shows an intaglio plate 102 for gravure offset printing as an example applied to the present invention. For example, granular sand obtained by coating glass beads, alumina, or elastic resin with an abrasive is sprayed with air pressure. By using a blasting method, an uneven part for selectively providing a chip 123 on the edge part 121 of the concave pattern 101 is processed to form an air vent passage for extracting from the ink area of the concave pattern as will be described later.

  FIG. 19 is a gravure offset printing intaglio plate 102 according to another embodiment of the present invention, for example, blasting in which granular sand obtained by applying abrasive to glass beads, alumina, or elastic resin is sprayed with air pressure. According to this method, fine unevenness of about 0.01 to 0.1 microns is formed on the entire surface of the intaglio plate 102 on which the transfer body 105 acts. For this reason, the uneven part which consists of fine unevenness | corrugation is formed also in the edge part 121 of the recessed part pattern 101, and the channel | path for air venting for extracting from the ink area | region of the recessed part pattern mentioned later in this part is formed.

  FIG. 20 shows a state in which blasting is further applied to that of FIG. 19, and the entire surface is shaved or corroded so that the corners of the edge portion 121 of the concave pattern 101 become smooth. The edge portion 121 of the concave pattern 101 is formed with a chipped or concave portion with a smooth corner. In this portion, an air vent passage is formed for extracting from the ink area of the concave pattern described later.

  21 uses the intaglio plate 102 of the indentation pattern 101 shown in FIGS. 18, 19 and 20, so that the ink-peelable transfer body 105 comes into contact with the ink at a certain pressure from above, and the indentation pattern 101 of the intaglio plate 102. 21, the air from the side of the concave pattern 101 passes through the air vent passage before the air having a strong air pressure is generated in the recessed portion 801 when the ink 110 is closely attached to the ink 110. As indicated by reference numeral 113, the recessed portion pattern 101 that has accumulated can be pulled out, and the air or air pressure in the recessed portion pattern 101 can be reduced. FIG. 21 shows a state in which the ink peelable transfer member 105 and the ink 110 accumulated in the concave pattern 101 of the intaglio 102 are more closely attached.

  According to the present invention aiming at the effect of this air bleed phenomenon, it is possible to reduce the occurrence of short-circuiting due to ink bleed due to conventional air disconnection and air explosion.

  A concave pattern 101 having a conductor part width of 100 μm was printed by the gravure offset printing method of the present invention using a conductive silver paste on a PET substrate.

  As the intaglio plate 102, a flat plate made of glass having a length of 120 mm, a width of 120 mm, and a height of 3 mm was used as a recess pattern 101 by engraving a groove having a width of 100 μm, a length of 500 μm and a depth of 15 μm by etching.

  Here, the intaglio plate 102 was subjected to the blasting process of the present invention, which was processed using an abrasive at an air pressure of 2 kgf, a gun distance of 100 mm, and a time of 20 seconds.

  The PET base material uses a thickness of 188 μm, a length of 120 mm × width of 120 mm, and the conductive silver paste uses a 9.5 Pa.s ink 110 at an angular velocity of 10 rad / sec. As the transfer body 105, a roller having a rubber hardness (JIS A) of 45 ° and a rubber thickness of 0.6 mm mainly composed of silicon rubber manufactured by Kinyo Co., Ltd. is used as a doctor or a squeegee 104 as a doctor blade manufactured by MDC. The regular type of was used.

  The gravure offset printing device uses the printing device developed by our company, fixing the intaglio plate 102 to the surface plate, and fixing the PET base material, which is the substrate 107, to the other surface plate. The contact width with the transfer body 105 is adjusted to 10 mm, the speed of insertion and abrasion of the ink 110 into the concave pattern 101 by the doctor, the peripheral speed of rolling on the intaglio plate 102 of the ink peelable transfer body 105, and the ink peelable transfer The peripheral speed of rolling on the PET substrate of the body 105 was set to 50 mm / second.

  As a result, it was possible to suppress the occurrence of disconnection or short-circuit in the portion where the pattern disconnection or short-circuit occurred due to air biting or air explosion in normal printing.

  The present invention can be used for mass production of stable quality of wiring patterns related to electronic devices.

  Further, according to the present invention, it is possible to easily form a multilayer circuit formed from a conductive wire layer and an insulating layer related to an electronic device.

  Further, according to the present invention, it is possible to accelerate the continuous printing technique improvement of roll printing that is roll-printed from a resin base material roll of PET or the like.

DESCRIPTION OF SYMBOLS 101 ... Concave pattern 102 ... Intaglio 103 ... The surface plate which fixed the intaglio 104 ... Doctor or squeegee 105 ... Ink-peeling transfer body 106 ... Ink film remaining on a transfer body 107 ... Printed material 108 ... Fixed which fixed the to-be-printed material Panel 109 ... Printed thin line pattern 110 ... Ink 111 ... Ink ejected state 113 ... Air escape arrow 701 ... Doctor or squeegee tip 801 ... Depressed part 901 ... Ink overflowing outside pattern 1201 ... Transfer body Ink film outside pattern remaining in pattern 1301 ... printed pattern

Claims (5)

A method for producing a printing plate for gravure offset printing having a concave pattern on a printing plate , for removing air remaining between a printing material and a transfer body in a concave pattern at an edge portion of the concave pattern from the region of the concave pattern. A method for producing a printing plate for gravure offset printing, characterized in that a passage is formed by subjecting the edge portion to a concave and convex portion that is selectively cut. A method for producing a printing plate for gravure offset printing having a concave pattern on a printing plate , for removing air remaining between a printing material and a transfer body in a concave pattern at an edge portion of the concave pattern from the region of the concave pattern. A method for producing a printing plate for gravure offset printing, characterized in that the passage is formed by applying fine grainy unevenness to the edge portion. A fine line pattern is formed using the printing plate for gravure offset printing manufactured by the manufacturing method of the printing plate for gravure offset printing of Claim 1 or 2. The printing method characterized by the above-mentioned.   A printing plate for gravure offset printing comprising a concave pattern on a printing plate, wherein the printing plate has an edge of the concave pattern having a plurality of chips.   A printing plate for gravure offset printing comprising a concave pattern on a printing plate, the gravure offset printing plate having an edge portion of the concave pattern having an unevenness of 0.01 to 0.1 microns.

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