JP2014081490A - Platemaking roll for gravure printing and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a platemaking roll for gravure printing and a method for manufacturing the same excellent in production efficiency, without using hexavalent chromium and without occurrence of a problem of side etching because no etching is performed.SOLUTION: A photoresist is applied on a surface of a cylindrical metal substrate that can be plated; the photoresist is exposed and developed to form a resist pattern part where a resist pattern is produced and a non-resist pattern part where the metal substrate is exposed on the surface of the substrate; the non-resist pattern part is plated with a metal that is applicable for plating, to a thickness exceeding the thickness of the resist pattern part, to form an overhanging plated part, rendering the resist pattern part into a recessed part; and DLC (diamond-like carbon) is applied to coat the overhanging plated part and the resist pattern part.

Description

  The present invention relates to a novel gravure printing plate making patterning by plating and a method for producing the same.

  In gravure printing, a minute concave portion (gravure cell) corresponding to plate making information is formed on a plate base material to produce a plate surface, and the gravure cell is filled with ink and transferred to a printing material. As well shown in FIG. 3, in a conventional general gravure printing roll 100, a metal hollow roll (plate base material) 102 such as aluminum or iron or a plastic such as CFRP (carbon fiber reinforced plastics). A copper plating layer (plate material) 104 for forming a plate surface is provided on the surface of a hollow roll (plate base material), a photoresist is applied to the copper plating layer 104, and the photoresist is exposed and developed to form a resist pattern 106. A large number of concave portions (gravure cells) 108 are formed according to plate making information by an etching method or an electronic engraving method, and then a hard chromium layer 110 is formed by chromium plating for increasing the printing durability of the gravure plate making roll. The surface-enhanced coating layer is formed to complete the plate making (plate surface production). However, because highly toxic hexavalent chromium is used in the chrome plating process, there is an extra cost to maintain work safety, and there are also problems of pollution, and the surface-enhanced coating layer replaces the chrome layer. The current situation is that the appearance of

  Therefore, the applicant of the present application has proposed, for example, a gravure printing roll described in Patent Document 1.

  However, like the gravure plate roll described in Patent Document 1, when a photosensitive material is applied to a base material and exposed, developed, burned, and etched, there is a problem that over etching called so-called side etching occurs. As the patterning becomes finer, the problem of side etching becomes more obvious. Therefore, the applicant of the present application has proposed a roll with a pattern described in Patent Document 2, for example.

  However, in the manufacturing method of the roll with a pattern described in Patent Document 2, since the film formation time is required, there is a problem that the manufacturing time becomes long and the production efficiency is inferior.

International Publication WO2008 / 120789 JP 2012-154964 A JP 2009-093170 A

  The present invention has been made in view of the above-mentioned problems of the prior art, and does not use hexavalent chromium, and since etching is not performed, the problem of side etching does not occur, and the gravure printing plate making is excellent in production efficiency. It aims at providing a roll and its manufacturing method.

  In order to solve the above problems, the gravure printing roll of the present invention is a resist in which a photoresist is applied to the surface of a cylindrical metal substrate that can be plated, and the photoresist is exposed and developed to form a resist pattern. A pattern portion and a non-resist pattern portion where the metal substrate is exposed are formed on the surface of the metal substrate, and a metal capable of plating is plated on the non-resist pattern portion to a thickness exceeding the thickness of the resist pattern portion. At least an overhang-shaped plated portion is formed so that the resist pattern portion is a recess, and the overhang-shaped plated portion and the resist pattern portion are covered with DLC (diamond-like carbon). It is characterized by.

  That is, the conventional gravure plate shown in FIG. 3 is a plate in which the pattern of the recesses is reversed.

  Thus, since the plate making is performed without using hexavalent chromium, there is an advantage that it is environmentally friendly. Further, since the plate making is performed without etching, there is an advantage that the problem of side etching does not occur. Furthermore, since the patterning can be continuously performed by plating, there is an advantage that the production efficiency is excellent. The patterning in the gravure printing plate roll of the present invention is patterning for forming a gravure cell.

  The cylindrical metal substrate to which the photoresist is applied can be any metal that can be plated, but the group consisting of nickel, tungsten, chromium, titanium, gold, silver, platinum, iron, copper, and aluminum. It is preferable to be composed of at least one material selected from Any metal that can be plated can be applied to the metal that can be plated on the non-resist pattern portion, for example, nickel, tungsten, chromium, titanium, gold, silver, platinum, iron, copper, aluminum, etc. Can be applied.

  The present invention is characterized in that a metal that can be plated is plated on the non-resist pattern portion to a thickness exceeding the thickness of the resist pattern portion to form an overhang-shaped plated portion. The overhang-shaped plated portion is plated by so-called overhang. Normally, the gravure cell of the gravure printing plate making roll has a flat cell bottom, and when going to the highlight part, the cell bottom becomes a round bottom, but the thickness of the plating part exceeds the thickness of the resist pattern part. When overhanging, the cell bottom of the gravure cell becomes a quadrangular pyramid when going to the highlight portion of the plate surface of the gravure printing plate making roll. For this reason, the plate-making roll for gravure printing of the present invention enables higher-definition printing.

  The gravure printing plate making roll of the present invention does not have a problem of side etching, so that the concentration range can be expanded as compared with the prior art.

  The thickness of the coated DLC coating film is preferably 0.1 μm to 10 μm. More specifically, 0.1 μm to 5 μm is more preferable.

  The cylindrical metal substrate may be provided on a CFRP (carbon fiber reinforced resin) material.

  The cylindrical metal base material may be provided on a cushion layer made of rubber or a resin having cushioning properties. As the cushion layer, a synthetic rubber such as silicone rubber, or a synthetic resin having elasticity such as polyurethane or polystyrene can be used. The thickness of the cushion layer is not particularly limited as long as it can provide cushioning properties, that is, elasticity. For example, a thickness of about 1 cm to 5 cm is sufficient. As an example of the gravure plate provided with a cushion layer made of rubber or a resin having cushioning properties, there is, for example, Patent Document 3.

  The photoresist is preferably a negative photoresist.

  The product of the present invention is printed by the gravure printing plate making roll.

  The method for producing a gravure printing roll according to the present invention comprises a step of preparing a cylindrical metal substrate, a photoresist is applied to the surface of the metal substrate, and the photoresist is exposed and developed to produce a resist pattern. Forming a resist pattern portion formed on the surface of the metal base material and a non-resist pattern portion where the metal base material is exposed; and a thickness of the resist pattern portion on the non-resist pattern portion with a metal capable of being plated. A step of forming an overhang-like plated portion by plating to a thickness exceeding the thickness and forming the resist pattern portion as a recess, and covering with the DLC so as to cover the overhang-like plated portion and the resist pattern portion And a process.

  The cylindrical metal substrate to which the photoresist is applied is composed of at least one material selected from the group consisting of nickel, tungsten, chromium, titanium, gold, silver, platinum, iron, copper, and aluminum. Is preferred.

  The thickness of the coated DLC coating film is preferably 0.1 μm to 10 μm. More specifically, 0.1 μm to 5 μm is more preferable.

  The method for manufacturing a gravure printing plate-making roll according to any one of claims 8 to 10, wherein the cylindrical metal substrate is provided on a CFRP material.

  The cylindrical metal substrate may be provided on a CFRP material.

  The cylindrical metal base material may be provided on a cushion layer made of rubber or a resin having cushioning properties.

  The photoresist is preferably a negative photoresist.

  According to the present invention, there is no problem of side etching because hexavalent chromium is not used and etching is not performed, and a gravure printing plate making roll excellent in production efficiency and a method for producing the same can be provided. Has a great effect.

1 schematically shows one embodiment of a gravure printing roll according to the present invention, wherein (a) applies a photoresist to the surface of a cylindrical metal substrate, and exposes and develops the photoresist to form a resist pattern; The main part sectional view showing the state where the resist pattern portion and the non-resist pattern portion where the metal base material is exposed are formed on the surface of the metal base material, and (b) the metal that can be plated on the non-resist pattern portion. Cross-sectional view of the principal part showing a state in which an overhang-shaped plated portion is formed by plating to a thickness exceeding the thickness of the resist pattern portion, and the resist pattern portion is formed as a recess, (c) is an overhang-shaped plated portion FIG. 3 is a cross-sectional view of a main part showing a state where the resist pattern portion is covered with DLC (diamond-like carbon) so as to cover the resist pattern portion. It is a flowchart which shows the process order of the manufacturing method of the plate-making roll for gravure printing shown in FIG. It is principal part sectional drawing which shows typically embodiment of the plate-making roll for the conventional gravure printing.

  Embodiments of the present invention will be described below, but these embodiments are exemplarily shown, and it goes without saying that various modifications can be made without departing from the technical idea of the present invention.

  In FIG. 1, the code | symbol 10 shows the plate-making roll for gravure printing. Reference numeral 12 denotes a cylindrical metal substrate that can be plated. The cylindrical metal substrate 12 can be any metal as long as it can be plated, but, for example, at least one selected from the group consisting of nickel, tungsten, chromium, titanium, gold, silver, platinum, iron, copper, and aluminum. It can be comprised from the material of.

  Moreover, the cylindrical metal base material 12 is good also as a structure provided on a CFRP (carbon fiber reinforced resin) material, and is good also as a structure provided on the cushion layer which consists of resin which has rubber | gum or cushioning properties.

  First, a cylindrical metal substrate 12 was prepared (step 100 in FIG. 2), a photoresist was applied to the surface of the cylindrical metal substrate 12, and the photoresist was exposed and developed to produce a resist pattern. A resist pattern portion 14 and a non-resist pattern portion 16 where the metal substrate 12 is exposed are formed on the surface of the metal substrate 12 (step 102 in FIG. 2). A negative photoresist is suitable as the photoresist. In this way, the state shown in FIG.

  Then, a metal that can be plated is plated on the non-resist pattern portion 16 to a thickness exceeding the thickness of the resist pattern portion 14 to form an overhang-shaped plated portion 18, thereby forming the resist pattern portion as a recess 22 ( Step 104 of FIG.

  As the metal that can be plated on the non-resist pattern portion 16, any metal that can be plated can be applied. For example, nickel, tungsten, chromium, titanium, gold, silver, platinum, iron, copper, aluminum Etc. can be applied. For example, when the cylindrical metal substrate 12 is copper, nickel can be applied as the metal of the plating portion 18. In this way, the state shown in FIG.

  Next, the overhanging plated portion 18 and the resist pattern portion 14 are covered with DLC so as to cover (step 106 in FIG. 2). When the DLC coating film 20 is formed, it can be coated with DLC by a CVD (Chemical Vapor Deposition) method or a sputtering method.

  The thickness of the DLC coating film 20 is preferably 0.1 μm to 10 μm. More specifically, 0.1 μm to 5 μm is more preferable. In the example of FIG. 1, an overhang-like plated portion 18 is produced by nickel plating on the surface of a cylindrical metal base material 12 made of copper, and the overhang-like plated portion 18 and the resist pattern portion 14 are removed. The example which coat | covered with DLC was shown. In the example of FIG. 1, the overhanging plated portion 18 has a thickness of 8 to 12 μm, the resist pattern portion 14 has a thickness of 2 to 3 μm, and the DLC coating film 20 has a thickness of 1 to 2 μm. That is, the thickness of the plated portion 18 is set to a thickness exceeding the thickness of the resist pattern portion 14.

  In this way, the gravure printing plate making roll 10 shown in FIG.

  The present invention will be described more specifically with reference to the following examples. However, it is needless to say that these examples are shown by way of illustration and should not be construed in a limited manner.

Example 1
Prepare a plate base material (aluminum hollow roll) with a circumference of 600 mm and a surface length of 1100 mm, and use the boomerang line (a fully automatic laser gravure plate making apparatus manufactured by Sink Laboratories, Inc.) to form the copper plating layer described below. went.

First, a plate base material (aluminum hollow roll) was mounted on a copper plating tank, and the hollow roll was completely immersed in a plating solution to form a copper plating layer of 80 μm at 20 A / dm ² and 6.0 V. The plating surface was free of bumps and pits, and a uniform copper plating layer was obtained.

The surface of the copper plating layer was polished using a 4-head type polishing machine (Sink Laboratory Co., Ltd. polishing machine) to make the surface of the copper plating layer a uniform polishing surface. Using the formed copper plating layer as a base material, a photosensitive film (thermal resist: TSER-NS (manufactured by Sink Laboratories)) was applied (fountain coater) to the surface and dried. The film thickness of the obtained photosensitive film was 5 μm as measured by a film thickness meter (F20 manufactured by FILLMETRICS, sold by Matsushita Techno Trading). The image was then developed with laser exposure. In the laser exposure, a laser stream FX was used and a predetermined pattern exposure was performed under an exposure condition of 300 mJ / cm ² .
The above development was performed at 24 ° C. for 90 seconds at a developer dilution ratio (stock solution 1: water 7) using a TLD developer (Sink Laboratories Inc. developer) to form a predetermined resist pattern.

Next, it was mounted in a nickel plating tank and half-immersed in a plating solution to form a 10 μm nickel plating layer at ^{2 A} / dm ² and 7.0 V. The plating surface was free of bumps and pits, and a uniform nickel plating layer was obtained. Next, the resist was peeled off with a 5% aqueous sodium hydroxide solution to form a predetermined nickel pattern. A DLC coating film was formed on the surface of the nickel pattern by a CVD method.

  An intermediate layer having a film thickness of 0.1 μm was formed in an argon / hydrogen gas atmosphere, hexamethyldisiloxane as a source gas, a film formation temperature of 80 to 120 ° C., and a film formation time of 60 minutes. Next, a DLC layer having a thickness of 2 μm was formed as a source gas using toluene, a film formation temperature of 80 to 120 ° C., and a film formation time of 180 minutes. Thus, a gravure printing plate making roll was obtained. When the surface of the plate-making roll for gravure printing thus obtained was observed with an optical microscope, a high-definition gravure plate was observed. The concave portion 22 of the obtained gravure printing plate making roll, that is, one side of the gravure cell was 145 μm, and the line width 24 of the nickel pattern bank was 12 μm. The depth of the gravure cell was 10 μm.

10: Plate making roll for gravure printing, 12: Cylindrical metal substrate, 14: Resist pattern part, 16: Non-resist pattern part, 18: Overhang-like plating part, 20: DLC coating film, 22: Concave part, 24: Line width of bank, 100: Conventional roll for gravure printing, 102: Metal hollow roll (plate base material), 104: Copper plating layer (plate material), 106: Resist pattern, 108: Recess (gravure cell), 110: Chrome layer.

Claims (13)

  A photoresist is applied to the surface of a cylindrical metal substrate that can be plated, and the photoresist is exposed and developed to form a resist pattern portion and a non-resist pattern portion where the metal substrate is exposed Formed on the surface of the metal substrate, plating the non-resist pattern portion to a thickness exceeding the thickness of the resist pattern portion by forming a metal that can be plated to form an overhang-shaped plated portion, and the resist pattern portion is recessed. A gravure printing roll made by coating with DLC so as to cover the overhanging plated portion and the resist pattern portion.   The cylindrical metal substrate to which the photoresist is applied is composed of at least one material selected from the group consisting of nickel, tungsten, chromium, titanium, gold, silver, platinum, iron, copper, and aluminum. 2. A plate making roll for gravure printing according to claim 1, wherein   The plate making roll for gravure printing according to claim 1 or 2, wherein the coated DLC coating film has a thickness of 0.1 µm to 10 µm.   The plate-making roll for gravure printing according to any one of claims 1 to 3, wherein the cylindrical metal substrate is provided on a CFRP material.   The plate-making roll for gravure printing according to any one of claims 1 to 3, wherein the cylindrical metal substrate is provided on a cushion layer made of rubber or a resin having cushioning properties.   The plate making roll for gravure printing according to any one of claims 1 to 5, wherein the photoresist is a negative photoresist.   A product printed by the gravure printing roll according to any one of claims 1 to 6. Preparing a cylindrical metal substrate;
A photoresist is applied to the surface of the metal substrate, and a resist pattern portion in which the photoresist is exposed and developed to form a resist pattern and a non-resist pattern portion where the metal substrate is exposed are formed on the metal substrate. Forming on the surface;
Plating the metal capable of plating on the non-resist pattern portion to a thickness exceeding the thickness of the resist pattern portion to form an overhang-like plated portion so that the resist pattern portion becomes a recess;
Coating with DLC so as to cover the overhanging plating portion and the resist pattern portion;
The manufacturing method of the plate-making roll for gravure printing characterized by including this.   The cylindrical metal substrate to which the photoresist is applied is composed of at least one material selected from the group consisting of nickel, tungsten, chromium, titanium, gold, silver, platinum, iron, copper, and aluminum. The manufacturing method of the plate-making roll for gravure printing of Claim 8 characterized by the above-mentioned.   10. The method for producing a gravure printing plate-making roll according to claim 8, wherein the coated DLC coating film has a thickness of 0.1 μm to 10 μm.   The method for manufacturing a gravure printing plate-making roll according to any one of claims 8 to 10, wherein the cylindrical metal substrate is provided on a CFRP material.   The method for producing a gravure printing plate-making roll according to any one of claims 8 to 10, wherein the cylindrical metal substrate is provided on a cushion layer made of rubber or a resin having cushioning properties. .   The method for producing a plate making roll for gravure printing according to any one of claims 8 to 12, wherein the photoresist is a negative photoresist.

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