JP5168805B2 - Letterpress for letterpress reversal offset printing and method for producing the same, or printed matter production method using the same - Google Patents

Description

  The present invention relates to a letterpress reverse offset printing method using a relief plate as a removal plate used in the reverse offset printing method, and more particularly to a letterpress plate and a method for producing the same, and a printed matter production method using the same.

  In recent years, in order to cope with cost reduction and miniaturization of electronic components, it has been attempted to form a patterned film such as a wiring or an insulating layer included in the electronic component by a printing method.

  Among printing methods, a reverse offset printing method can be cited as a printing method capable of forming a fine image pattern (see, for example, Patent Document 1).

  A schematic diagram of an apparatus 50 used in the reverse offset printing method is shown in FIG. In addition, the white arrow in FIG.5 and FIG.6 has shown the moving direction. In FIG. 5, a cylindrical ink film forming substrate called a so-called blanket 52, an ink supply means 51 for supplying ink to the blanket to form an ink film 53, and an unnecessary portion 53b from the ink film formed on the blanket are shown. A removal plate 54 to be removed, a printing substrate 55 to be printed by transferring a main part 53a remaining on the blanket, and a conveying means 56 for conveying the printing substrate to a position suitable for printing are shown. The blanket is usually treated so that the ink film is easily peeled off. For example, silicone rubber is used. Here, the ink film forming substrate is drawn in a cylindrical shape, and the removal plate is drawn in a plate shape. However, as long as a uniform ink film can be formed, the shape of the ink film forming substrate is cylindrical. A plate shape may be used, and for example, an arc shape having a deflection can be selected. Further, any shape may be selected for the removed plate as long as unnecessary portions of the ink film can be removed appropriately.

The printing process will be described step by step with reference to FIG.
First, the ink is applied from the ink supply means 61 onto the ink film forming substrate 62 to form the ink film 63 (FIG. 6A). At this time, the ink is placed in a pre-dried state on the ink film-forming substrate and loses some solvent to form an ink film. Next, a removal plate 64 having a predetermined shape is brought into contact with the ink film to transfer the unnecessary portion 63b of the ink film and remove it from the ink film forming substrate (FIG. 6B). Here, a relief plate is used in which the part corresponding to the main part is a concave part and the part corresponding to the unnecessary part is a convex part. Next, the principal part 63a of the ink film remaining on the ink film forming substrate can be transferred to the substrate to be printed 65 to obtain a printed matter (FIG. 6C).

  As an example of forming an image pattern by such a relief reversal offset printing method, it has been proposed to produce an electromagnetic wave shield by performing printing using a conductive ink on a substrate (see, for example, Patent Document 2).

  Here, since the removed plate is usually reused in the production process of the printed matter, after the unnecessary ink film is removed from the ink film forming substrate, it is necessary to wash the removed plate itself. The removal plate can be washed with an aqueous chemical solution or an organic solvent. However, a waste liquid treatment facility is required, and the removal plate takes time to dry and cannot be used or produced continuously. there were. There is also a problem that ink film debris remains between reliefs of the removed plate.

JP 2000-289320 A JP 2005-175061 A

Therefore, a method has been considered in which the removed plate is pressed against a film (adhesive film) provided with an adhesive layer to transfer the ink film held by the removed plate. However, the removal plate must have high affinity with the ink film to such an extent that the ink film can be peeled off from the ink film forming substrate. In particular, when glass is used as the material of the removal plate, since the contact angle of the glass with pure water is large, it is more difficult to remove (transfer) the ink film from the removal plate.
Furthermore, in order to improve the versatility of printed electronic parts and the like and production efficiency, it is possible to continuously form an image pattern using a long flexible film in a roll shape as a substrate to be printed. It has been demanded. When the removal plate is continuously used and washed, whether the removal plate is reliably washed and whether it can be used immediately after washing is closely related to its productivity.

  The present invention provides a removal plate that can be easily and reliably washed and can be used immediately after washing. That is, the first invention made in order to solve the above problems is an ink film forming step of forming an ink film by applying ink on an ink film forming substrate, and a relief plate having a predetermined shape with respect to the ink film. Removing the ink film from the ink film forming substrate by transferring unnecessary portions of the ink film to the convex portions of the relief printing plate, and printing the main part of the ink film remaining on the ink film forming substrate. A relief printing used in a relief printing offset printing method comprising a transfer step for transferring to a substrate, wherein the relief printing surface of the relief printing is characterized in that the surface having irregularities of the relief printing is subjected to an ink release treatment. It is a letterpress.

According to a second aspect of the present invention , there is provided the relief printing for letterpress reverse offset printing according to claim 1, wherein the ink releasability treatment is a treatment with a silane coupling agent.
A third invention is a relief printing plate for letterpress reverse offset printing, wherein the silane coupling agent is alkyltrimethoxysilane.

According to a fourth aspect of the present invention, there is provided a relief printing for letterpress reverse offset printing, characterized in that different ink peelability treatments are applied to the top of the projection, the side of the projection and the bottom of the depression.

According to a fifth aspect of the present invention, there is provided a letterpress reversal offset printing characterized in that a contact angle with respect to pure water on a convex side surface and a concave bottom surface of the relief plate is larger than a contact angle with respect to pure water on a top portion of the convex part with the relief plate. It is a letterpress.
In a sixth aspect of the invention , the ink releasability treatment performed on the convex side surface and the concave bottom surface of the relief printing plate is treatment with fluoroalkylsilane, an oligomer containing a fluoroalkyl group, or a siloxane containing a hydrolyzable group. Is a relief printing for letterpress reversal offset printing.

According to a seventh aspect of the present invention, there is provided an ink film forming step of forming an ink film by applying ink on an ink film forming substrate, and contacting the ink on a convex portion of the relief plate by bringing a relief plate having a predetermined shape into contact with the ink film. A letterpress inversion comprising a removal step of transferring and removing unnecessary portions of the film from the ink film-forming substrate, and a transfer step of transferring the main portion of the ink film remaining on the ink film-forming substrate to the substrate to be printed A method for producing a relief plate for use in the off-foot printing method, a step of masking a position corresponding to a convex portion of a substrate surface serving as a relief base material in a pattern, a step of etching an unmasked region of the substrate surface, a substrate A step of performing a second ink releasability treatment on the etched region of the surface, a step of peeling the mask formed in a pattern, and a step of performing the first ink releasability treatment after the mask removal. Letterpress reversal Offset is a method of manufacturing a relief printing plate.

According to an eighth aspect of the invention , at least an ink film forming step of forming an ink film by applying ink on an ink film forming substrate, and a relief of a predetermined shape are brought into contact with the ink film to form a convex portion of the relief A removal step of transferring and removing unnecessary portions of the ink film from the ink film-forming substrate, and a transfer step of continuously transferring principal portions of the ink film remaining on the ink film-forming substrate to the substrate to be printed Is a method for producing a printed material by using a letterpress reverse offset printing method, wherein after the removing step, the convex part of the letterpress and the adhesive surface of the adhesive film are brought into contact with each other and the ink film held by the convex part of the letterpress is adhesive. A printed matter manufacturing method comprising a cleaning step of transferring to a film and cleaning the relief printing plate, wherein the relief printing plate is used as a relief printing plate.

Since the relief printing for relief printing of the present invention has an ink-peeling treatment on its surface, an unnecessary ink film can be easily removed. In particular, the ink film can be reliably removed even by washing in a dry environment using an adhesive film, so that it can be used for the next printing quickly, and is particularly suitable for continuous printing. In addition, the relief printing for letterpress reversal offset printing of the present invention, which has been subjected to the second ink peelability treatment on the top of the projection and the first ink peelability treatment on the side surface of the projection and the bottom of the recess, It is possible to clean well without leaving ink film debris.
In addition, the printed matter manufacturing method of the present invention uses a relief printing plate that is easy, reliable and can be printed immediately after washing as a removal plate, and therefore continuously produces printed matter without stopping printing. be able to.

<Letterpress>
The letterpress of the present invention will be described with reference to FIGS.
As the material of the relief printing plate of the present invention, metals such as glass and stainless steel, various materials, or combinations thereof can be used, but are not limited thereto. Glass is preferred because it is robust and easy to process.

  The relief plates 10 and 20 of the present invention are formed so that the portion corresponding to the unnecessary portion becomes a convex portion (relief pattern) in order to remove the unnecessary portion from the ink film on the ink film forming substrate and leave the essential portion. Has been. Referring to FIG. 1, in this specification, the highest part of the relief plate surface is the convex top 14 and the lowest part is the concave bottom 16, and the side of the convex or the side of the concave is the convex side. 15 is assumed. The difference between the convex top 14 and the concave bottom 16 is the plate depth d, and the allowable range is selected depending on the printed matter to be manufactured.

  Further, the relief printing plate of the present invention is subjected to an ink peeling treatment on its surface (FIGS. 1 and 2). Here, the thick line in FIGS. 1 and 3 represents the surface that has been subjected to the ink releasability treatment, the thick broken line in FIGS. 2 and 4 represents the surface that has undergone the first ink releasability treatment, and the thick line represents the second surface. Represents a surface that has been subjected to ink releasability treatment. Examples of the ink releasability treatment include chemical treatment using silicone or a silane coupling agent, physical treatment such as fluorine plasma, and silane coupling treatment for glass and metal surfaces is preferable in consideration of long-term stability. .

  The coupling agent selected for the ink release treatment varies depending on the ink used, but alkylsilane coupling agents such as methyltrimethoxysilane, n-hexyltrimethoxysilane, n-octyltrimethoxysilane, and dodecyltrimethoxysilane Is preferred. The surface of the relief printing plate after the ink peelability treatment preferably has a smaller contact angle with respect to pure water, but preferably has a larger contact angle with respect to pure water than the ink film formation surface of the blanket that is the above-described ink film formation substrate.

  The same ink peelability treatment may be applied to the convex and concave portions of the relief printing (FIG. 1). The top part of the convex part is subjected to the second ink peelability treatment, the first side face of the convex part and the bottom part of the concave part are subjected to the first ink peelability process (FIG. 2), It is more preferable that the contact angle with respect to is small. For the second ink releasability treatment, the above-mentioned coupling agents can be preferably used. In addition, as the surface treatment agent for the convex side surface and the bottom surface, an ink repellant surface treatment agent is preferable. From the above viewpoint, the first ink releasability treatment includes a fluorine element or a siloxane group among the silane coupling agents. It is preferable to use the silane coupling agent contained. Examples of the compound that can be preferably used for the first releasable treatment include long-chain fluoroalkylsilanes, hydrolyzable group-containing siloxanes, and fluoroalkyl group-containing oligomers.

  Examples of the method of performing the ink releasability treatment on the surface of the relief plate include a method of chemically bonding and fixing the above coupling agent to the relief plate surface. For example, a known glass surface treatment method using a silane coupling agent can be used. That is, a silane coupling agent is dissolved in water, acetic acid water, a water-alcohol mixed solution, or alcohol to prepare a coupling agent solution. Next, the coupling agent solution is applied to the glass surface using a known coating method such as spin coating, roll coating, and applicator. Finally, the silane coupling agent can be fixed to a relief surface such as glass by drying and removing the solvent. This method can be used for both the second ink peelability treatment and the first ink peelability treatment.

  The contact angle of the convex top with respect to pure water is preferably 30 degrees or more and 90 degrees or less. The contact angle with respect to pure water on the side surface of the convex portion and the bottom surface of the concave portion is larger than this, and preferably 90 degrees or more and 180 degrees or less. A difference in the contact angle of pure water between the irradiated part and the non-irradiated part can also be given by applying the same ink peelability treatment to the entire surface of the relief plate and then performing UV irradiation or the like with a mask.

<Manufacture of letterpress>
An example of the manufacturing process of the relief printing plate of the present invention will be described with reference to FIG. 3 and another example with reference to FIG. In FIG. 4, steps common to FIG. 3 are omitted.
First, a pattern 32 masks the positions corresponding to the convex portions on the surface of the substrate to be the relief base 31 (FIG. 3A). The mask only needs to protect the surface of the substrate in the subsequent relief forming process. For example, a metal or a photosensitive resin can be used. In the case of metal, after vapor deposition, a resist is formed so as to cover a necessary portion, and etching can be performed under the condition that only the metal is etched.

  An area not covered with the mask of the masked base material 33 thus obtained is engraved to form a relief 34 (FIG. 3B). The formation method of the relief can be appropriately selected according to the selected substrate, for example, blasting such as sand blasting or wet blasting, cutting by FIB (focused ion beam), nanoimprinting method, dry etching, wet etching, etc. Can be mentioned.

  As a relief forming method, for example, chromium vapor deposition is performed on a glass substrate, a resist is formed on the chromium film by a photolithography method, unnecessary portions (that is, regions corresponding to the main portions) are opened, and etching is performed. Next, the resist on the chromium film is peeled off, and the glass substrate is wet etched using the chromium film as a mask to form a relief pattern having a predetermined depth on the glass substrate.

  Here, when different ink peelability treatment is performed on the top of the relief plate, the relief side surface and the recess (that is, the surface newly formed by etching), the first ink removal treatment is performed before peeling the mask of the chromium film. 45a is performed (FIG. 4A).

After the relief is formed, the mask 32 is removed from the relief plate base 31 (FIG. 3C), and the relief plate 35 of the present invention can be obtained by applying an ink release treatment 35 to the entire relief plate (FIG. 3D). ). In the case where the first ink releasability treatment 45a is performed before the mask is peeled off, the second ink peelability treatment 45b is performed after the mask 42 is peeled off (FIG. 4B). A certain letterpress 40 can be obtained (FIG. 4C). In the latter case, the portion where the first ink releasable treatment 45a has been subjected to the coupling treatment (since the surface is no longer SiO ₂ ), the second ink releasable treatment liquid However, the second ink peeling treatment 45b is performed only on the masked portion.

<Manufacture of printed matter>
The production of a printed matter by the relief reversal offset printing method using the relief plate of the present invention thus obtained will be described with reference to FIGS. Note that description of what has already been described is omitted.
The relief printing plate of the present invention is used as a removal plate for relief printing offset printing.

  The ink film forming base material used in the letterpress reversal offset printing method is commonly called a blanket 52. This material includes ink film formation, ink film removal of non-image parts (unnecessary parts 53b and 63b) by letterpress, and a substrate to be printed. An image portion (main portions 53a and 63a) capable of transferring an ink film to 55 and 65 is used. A material with little deformation is preferable, but a certain degree of flexibility is required. As such a material, silicone elastomer, butyl rubber, ethylene propylene rubber and the like can be used. Further, in order to adjust the wettability of the blanket surface, surface treatment such as application of fluororesin and silicone, plasma treatment, UV ozone cleaning treatment may be performed on the blanket surface. Since such an ink film forming member is usually supplied as a flexible plate, it is used by winding it around a cylindrical plate cylinder (see FIG. 5) or by fixing it to a strong flat plate. be able to.

  The ink used in the letterpress reverse printing method can be adjusted according to the type of printed matter to be produced, and various additions can be made to metal fine particle dispersions such as gold, silver, copper, nickel, platinum, palladium, and rhodium. Examples include, but are not limited to, conductive ink with an additive, ink in which an organic electroluminescence (EL) material is dissolved or dispersed in an organic solvent, and a pigment dispersion for a color filter. In consideration of swelling of the blanket material and the like, it is preferable to adjust using water or an alcohol solvent.

  As the ink supply means 51 and 61 on the ink film forming substrate, it is only necessary to form a uniform ink film, and bar coating, die coating, cap coating, spin coating, slit coating, and the like can be used. It is not limited to.

  The printed substrates 55 and 65 on which an image is formed by transferring the ink film can be appropriately selected according to the target printed matter. In the case of manufacturing electronic components, usually, polyethylene terephthalate (PET), polyimide, polyethersulfone (PES), polyethylene naphthalate (PEN), flexible plastic materials such as polycarbonate, glass substrates such as quartz, and silicon wafers are listed. be able to. It is also possible to select a flexible substrate such as a film according to the environment in which the printed material is used. In this case, in order to improve production efficiency, it is preferable to perform continuous printing using a long base material. If printing is performed using the relief printing plate of the present invention, a roll-shaped long base material is used. Can also be printed efficiently.

  Examples of the printed matter produced by the production method using the relief plates 54 and 55 of the present invention include a thin film transistor substrate, a color filter, a printed wiring board, and an organic electroluminescence element. The thin film transistor substrate includes a plurality of thin film transistors in an array corresponding to the pixels, and can be used as a display member that needs to be turned on and off for each pixel such as a liquid crystal display.

  Examples of the image pattern printed using the relief printing plate of the present invention include, for example, an electrode, a capacitor electrode, a wiring, and the like provided in the thin film transistor substrate, a colored layer provided in the color filter, an electrode provided in the organic electroluminescence element, and organic electroluminescence. In the case of a layer, a wiring provided in a printed wiring board, or a printed wiring board with a built-in element, list passive elements / active elements such as capacitor electrodes, dielectric layers, resistive element electrodes, resistors, inductors, transistor components, etc. Can do.

After the unnecessary ink film is removed from the ink film forming substrate, the ink film held by the convex portions of the relief printing plate is washed by a washing process. As a method for washing the relief plate, there can be mentioned a method of washing with a chemical solution or an organic solvent, and a method of removing an ink film by pressing it onto an adhesive film carrying an adhesive. As a chemical | medical solution which can be used for washing | cleaning, an alkaline washing | cleaning liquid can be mentioned, for example. Examples of the organic solvent include toluene. The liquid can be selected appropriately depending on the composition of the ink film, and a liquid that does not attack the material constituting the relief printing plate may be selected. Vibration can also be applied by ultrasonic waves during cleaning. As an adhesive film that can be used for washing, a commercially available adhesive film can be used. For example, an ethylene vinyl acetate copolymer is used as a base film, and adhesion is imparted by applying an acrylic adhesive. The adhesive film made can be used. It is sufficient that the pressure-sensitive adhesive does not transfer to the relief plate during washing. Washing with an adhesive film can be used for immediate printing after washing, and is particularly suitable for printing continuously using the same letterpress. Therefore, the adhesive film is also supplied in a roll state, and a necessary portion may be pressed against the relief plate according to use, and the used film may be wound up.
Hereinafter, embodiments of the present invention will be described by way of examples.

A 100 mm × 100 mm, 0.7 mm thick glass plate was used as the material for the relief plate. Chromium was deposited on one side of this glass plate to a thickness of 50 nm. A resist pattern was formed on the chromium film by a photolithography method using a positive resist, and the exposed chromium film was etched. The resist was peeled off to obtain a glass plate on which a chromium image pattern was formed.
Using this chrome film as a mask, by etching the glass using hydrofluoric acid, the concave and convex portions are formed so that the depth of the concave portion becomes 5 μm, and then the chromium pattern is peeled off by etching, so that the portion corresponding to the unnecessary portion is the convex portion. A letterpress plate for reverse offset printing was produced in which the part corresponding to the part was a recess.

  Next, a solution obtained by dissolving n-hexyltrimethoxysilane (product name: AZ-6177, manufactured by Nihon Unicar Co., Ltd., trade name: AZ-6177) in isopropyl alcohol as a silane coupling agent is spinned on the uneven surface of the removed plate. By coating and drying at 120 ° C. for 10 minutes, a silane coupling agent was chemically bonded to the entire concave / convex forming surface of the relief printing, and a relief offset relief printing plate according to the present invention having been subjected to ink peeling treatment was produced. The contact angle with respect to pure water on the surface of the relief printing plate (surface having irregularities) thus obtained is 79.8 degrees.

  The relief printing of the present invention thus obtained was actually subjected to relief printing reverse offset printing, and the performance was evaluated. As an ink used for the test, a color ink for a color filter was used. The composition of the colored ink is shown below.

First, a red pigment dispersion was prepared with the following composition.
<Red pigment dispersion>
-Red pigment C.I. I. Pigment Red 254 ("Ilgar Forred B-CF" manufactured by Ciba Specialty Chemicals) ... 18 parts by weight C.I. I. Pigment Red 177 ("Chromophthal Red A2B" manufactured by Ciba Specialty Chemicals Co., Ltd.) ... 2 parts by weight Acrylic varnish (solid content 20%) ... 108 parts by weight

<Red coloring ink>
Thereafter, a mixture having the following composition was stirred and mixed to be uniform, and then filtered through a 5 μm filter to obtain a red colored ink.
-Red pigment dispersion liquid: 100 parts by weight-Methylated methylol melamine (manufactured by Sanyo Chemical Industries, Ltd .: trade name MW-30) ... 20 parts by weight- Leveling agent (manufactured by Dainippon Ink & Chemicals, Inc .: trade name: Megafuck) F-483SF) ... 1 part by weight, propylene glycol monomethyl ether ... 85 parts by weight, propylene glycol monomethyl ether acetate ... 45 parts by weight

The red colored ink thus prepared was applied on a blanket (GE Toshiba Silicone Co., Ltd .: trade name: TSE3455T) using a # 6 bar coater, dried at room temperature for about 2 minutes, and then subjected to ink release treatment. The relief printing plate of Inventive Example 1 was brought into contact with the dried ink film on the blanket to remove the ink film in the non-image area. Next, an ink pattern was obtained on the glass substrate by bringing the blanket with the image portion left into contact with the glass substrate which is the substrate to be printed and peeling the ink film from the image portion from the blanket.
The ink film on the letterpress transferred from the blanket could be completely removed from the letterpress by bringing the adhesive film into contact with the ink film transfer surface of the letterpress. The adhesive film used here is an ethylene vinyl acetate copolymer film coated with an acrylic adhesive.

The glass plate was etched in the same manner as in Example 1 to obtain a glass plate in which a portion corresponding to the unnecessary portion was a convex portion, a portion corresponding to the main portion was a concave portion, and a chromium film was left on the top of the convex portion.
Next, this relief printing plate was immersed for 10 minutes in a solution obtained by dissolving fluoroalkylsilane (manufactured by GE Toshiba Silicone Co., Ltd .: trade name TSL8233) as silane coupling agent in isopropyl alcohol so as to be 0.5% by weight. By subjecting to partial drying, an ink repellency treatment was applied to the side surface and the bottom surface of the convex portion as the first ink releasability treatment. Thereafter, the chromium pattern was peeled off by etching, and then a solution prepared by dissolving n-hexyltrimethoxysilane (manufactured by Nihon Unicar AZ-6177) in isopropyl alcohol at 0.5 wt% was spin-coated on the relief plate at 120 ° C. The second ink peelability treatment was applied to the top of the relief plate by drying for 10 minutes. In this way, a relief printing for letterpress reversal offset printing according to another embodiment of the present invention was produced. In the relief printing plate of another embodiment, the contact angle with respect to pure water at the top of the convex portion is 79.8 degrees, and the contact angle with respect to pure water on the side surfaces of the convex portion and the bottom surface of the concave portion is 101.1 degrees.

The relief printing of another form of the present invention thus obtained was subjected to relief printing reverse offset printing in the same manner as in Example 1 to evaluate the performance. The ink used for the printing method and evaluation is the same as in Example 1.
The ink film on the letterpress transferred from the blanket was washed with methyl ethyl ketone, and the letterpress was dried with compressed air. As a result, ink could be removed from the relief printing plate according to another embodiment of the present invention, and no ink remained in the recesses.

Evaluation was carried out in the same manner as in Example 1 using the relief printing plate produced in Example 1 as an embodiment of the present invention. The ink used for the printing method and evaluation was the same as in Example 1, and the relief printing method was the same as in Example 1. However, the evaluation was carried out by continuously printing 100 sheets without washing the relief plate, except for washing the relief plate by the method of Example 1 for each printing, and evaluating the obtained printed matter.
As a result, the obtained printed matter was free from defects and smudges, and all 100 sheets were printed satisfactorily.

  Printing was continuously performed in the same manner as in Example 3 except that the relief printing plate according to another embodiment of the present invention manufactured in Example 2 was used, and the printed matter was evaluated. As a result, the obtained printed matter was free from defects and smudges, and all 100 sheets were printed satisfactorily.

Evaluation was carried out in the same manner as in Example 1 using the relief printing plate produced in Example 1 as an embodiment of the present invention. The ink used for the printing method and evaluation was the same as in Example 1. However, the evaluation was carried out by printing 100 sheets continuously without washing the relief printing plate with the method of Example 2 every time printing, and drying it, and evaluating the obtained printed matter. did.
As a result, stains observed due to poor cleaning (ink film removal failure) were adhered to 3 out of 100 sheets.

  Printing was continuously carried out in the same manner as in Example 5 except that the relief printing plate produced in Example 2 was used as another embodiment of the present invention, and the printed matter was evaluated. As a result, the obtained printed matter was free from defects and smudges, and all 100 sheets were printed satisfactorily.

  From the above results, the relief printing plate of the present invention having the surface subjected to ink releasability treatment can be easily washed. Even a relief printing plate that has been uniformly treated with an ink releasable surface can be washed sufficiently reliably, but in particular, if the treatment of the top of the relief, the side of the relief and the bottom of the depression is different, the printed material will be continuously printed. It was found that even if it was manufactured and washed with a cleaning liquid, it was an excellent letterpress plate that did not cause poor cleaning, and therefore did not cause defects in the printed matter.

  The relief printing for letterpress reverse offset printing according to the present invention is an easy and reliable removal of unnecessary ink film removed from the ink film forming substrate and carried on the projections of the relief printing plate, such as a thin film transistor, thin film transistor array, color filter, etc. This device can be applied when manufacturing the device as a printed matter.

It is sectional drawing which shows an example of the relief printing for relief printing reverse offset printing methods of this invention. It is sectional drawing which shows the other example of the relief printing for relief printing reverse offset printing methods of this invention. It is a schematic diagram which shows an example of the manufacturing process of the relief printing plate of this invention. It is a schematic diagram which shows the other example of the manufacturing process of the letterpress of this invention. It is a schematic diagram of the apparatus used for the reverse offset printing method. It is a schematic diagram of the process explaining the reverse offset printing method.

Explanation of symbols

10: Letterpress 11: Ink releasable treated surface 14: Convex top 15: Convex side 16: Concave bottom 20: Letter plate 21: First ink releasable treated surface 22: Second ink releasable treated surfaces 30, 40 : Relief plate 31, 41: relief substrate 32, 42: mask 33: masked substrate 34, 44: relief 35: ink release treatment 45a: first ink release treatment 45b: second ink release treatment 36: Ink releasable treated surface 46a: First ink releasable treated surface 46b: Second ink releasable treated surface 50: Letter reversal offset printing device 51, 61: Ink supply means 52: Blanket 62: Ink film forming base Materials 53, 63: Ink films 53a, 63a: Ink film main parts 53b, 63b: Ink film unnecessary parts 54: Removal plate 64: Relief plate 55, 65: Printed substrate 56: Conveying means

Claims (1)

at least,
An ink film forming process in which ink is applied onto an ink film forming substrate to form an ink film;
A removing step of contacting the ink film with a predetermined shape against the ink film and transferring an unnecessary portion of the ink film to the convex portion of the relief plate to remove it from the ink film forming substrate;
A method for producing a printed material by a letterpress reverse offset printing method that repeats a transfer step of continuously transferring a main part of the ink film remaining on the ink film forming substrate to a substrate to be printed,
Furthermore, the ink film on the relief printing plate is washed with methyl ethyl ketone after the removal step, and the relief printing plate is dried with compressed air.
The surface having the irregularities of the relief plate has been subjected to ink releasability treatment,
Ink peelability that is different between the top of the convex portion, the side surface of the convex portion, and the bottom surface of the concave portion.
Has been
The contact angle of the convex side surface and the concave bottom surface of the relief plate with respect to pure water is the convexity of the relief plate.
A method for producing a printed matter, comprising using a relief printing for letterpress reverse offset printing having a contact angle larger than that of pure water at the top of the part .

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