Gravure plate, method for manufacturing the same, and method for manufacturing a gravure printed matter using the same

Abstract

Provided are: a gravure plate which remedies a plate fogging problem compared to a gravure plate surface-coated by chromium plating; a manufacturing method therefor; and a manufacturing method for gravure printed matter using the same.　This cylindrical gravure plate for performing printing, with gravure ink, on a web-shaped substrate to be printed has a surface on which a plate surface including an image part and a non-image part is formed, and includes a gravure cylinder body, an image part and a non-image part that are formed on the surface of the gravure cylinder body, and a DLC-Si layer formed so as to cover the image part and the non-image part, wherein the contact angle of the plate surface of the gravure plate with respect to water is at least 70 degrees and the glossiness change rate of the plate surface of the gravure plate before and after printing is at most 3%.

Description

Technical Field

[0001] The present invention relates to a cylindrical gravure plate for gravure printing with improved ink doubling, a method for manufacturing the same, and a method for manufacturing a gravure printed matter using the same.

Background Art

[0002] In gravure printing, minute recesses (cells) corresponding to plate-making information are formed on a hollow cylindrical object to be processed to produce the printing surface of a gravure cylinder. Ink is filled into the cells and transferred to an object to be printed. A general cylindrical gravure plate (also called a gravure cylinder or a plate-making roll) has a cylindrical iron core or aluminum core (hollow roll) as a base material, and a plurality of layers such as an underlayer and a release layer are formed on the outer peripheral surface of the base material, and a plating layer such as copper plating is formed thereon. Then, cells corresponding to plate-making information are formed in the plating layer such as copper plating by a laser exposure device, and then chromium plating or the like is applied to increase the printing durability of the gravure cylinder, and plate-making (production of the printing surface) is completed.

[0003] Generally, the ink used for gravure printing is oil-based, and due to various problems, water-based conversion is desired. Since water-based ink contains a large amount of water, the drying load is large and the printing speed cannot be increased. In order to make the printing speed equivalent to that of oil-based ink, it is necessary to increase the pigment concentration of water-based ink and reduce the amount of water-based ink used.

[0004] However, when the pigment concentration of water-based ink is increased and the amount of water-based ink used is reduced, as a demerit, when the water-based ink that has passed through between the gravure cylinder and the doctor blade transfers to a web-like printing substrate such as a film in a non-image area, coloring occurs even in the non-image area. This phenomenon is called "ink doubling".

[0005] Doubling is a phenomenon that appears more prominently as the ink is darker. Chromium plating is applied to the surface of the gravure cylinder for gravure printing as described above to withstand friction with the doctor blade.

[0006] For example, in a gravure printing apparatus as shown in Patent Document 1, it is conceivable to eliminate plate doubling. However, in the case of the gravure printing apparatus as shown in Patent Document 1, it was necessary to use a special printing apparatus different from a normal gravure printing apparatus in order to eliminate plate doubling. For this reason, even without the gravure printing apparatus as shown in Patent Document 1, a gravure plate (gravure cylinder) capable of eliminating plate doubling has been eagerly awaited.

[0007] However, in the case of a gravure plate having its surface coated with chrome plating, the problem of plate doubling could not be solved even through trial and error.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0009] As a result of intensive studies by the inventors, when the surface of the gravure plate was coated with DLC having increased water repellency doped with silicon instead of chrome plating, it was found that by increasing the water repellency of the surface, the ink scraping property by the doctor blade was improved and plate doubling was improved, and the present invention was achieved.

[0010] That is, the present invention has been made in view of the problems of the above-mentioned prior art, and an object thereof is to provide a gravure plate in which the problem of plate doubling is improved, a method for manufacturing the same, and a method for manufacturing a gravure printed matter using the same, as compared with a gravure plate having its surface coated with chrome plating.

Means for Solving the Problems

[0011] In order to solve the above problems, the gravure plate of the present invention is a cylindrical gravure plate having a plate surface formed with an image portion and a non-image portion on the surface for printing a web-shaped substrate to be printed with gravure ink, including a gravure cylinder body, an image portion and a non-image portion formed on the surface of the gravure cylinder body, and a DLC-Si layer formed so as to cover the image portion and the non-image portion. The contact angle of the plate surface of the gravure plate with respect to water is 70 degrees or more, and the change rate Gs Δ (%) of the glossiness of the plate surface of the gravure plate before and after printing calculated by the following formula (1) is 3% or less, which is a gravure plate. Change rate Gs of glossiness Δ ={(Gs0 - Gs1) / Gs0}×100 ···(1) In the above formula (1), Gs0 is the 20-degree specular glossiness of the plate surface of the gravure plate before printing measured based on JIS Z 8741, Gs1 is the 20-degree specular glossiness of the plate surface of the gravure plate after printing measured based on JIS Z 8741.

[0012] The thickness of the DLC-Si layer is preferably 1.0 μm to 10.0 μm.

[0013] The gravure ink is preferably an aqueous ink. When the aqueous ink is an alcohol-free aqueous ink, the contact angle of the plate surface of the gravure plate with respect to the alcohol-free aqueous ink is preferably 30 degrees or more.

[0014] The gravure plate is obtained by subtracting the reflection density D0 measured in accordance with JIS B 9620-1 by stacking 32 films (2 cm × 2 cm) of the non-image portion of the printed web-shaped substrate to be printed at the printed portion of the web-shaped substrate to be printed with non-white aqueous ink from the reflection density D1 measured in accordance with JIS B 9620-1 by stacking 32 films (2 cm × 2 cm) of the unprinted web-shaped substrate to be printed. The value (D1 - D0) is preferably 0.35 or less.

[0015] It is preferable that the Vickers hardness Hv of the surface of the gravure plate is 800 or more.

[0016] The method for manufacturing a gravure plate of the present invention is a method for manufacturing a gravure plate for manufacturing the gravure plate, and includes a step of preparing a gravure cylinder body having an image portion and a non-image portion formed on the surface, and a step of coating the image portion and the non-image portion with DLC-Si. It is a method for manufacturing a gravure plate.

[0017] The method for manufacturing a gravure printed matter of the present invention is a method for manufacturing a gravure printed matter for printing a web-shaped substrate to be printed using the gravure plate, and the change rate of the glossiness of the surface of the gravure plate before and after printing calculated by the following formula (1) is 3% or less. It is a method for manufacturing a gravure printed matter. Change rate of glossiness = {(Gs0 - Gs1) / Gs0} × 100 ···(1) In the above formula (1), Gs0 is the 20-degree specular glossiness of the surface of the gravure plate before printing, measured based on JIS Z 8741, Gs1 is the 20-degree specular glossiness of the surface of the gravure plate after printing, measured based on JIS Z 8741.

[0018] In the method for manufacturing the gravure printed matter, from the reflection density D1 measured in accordance with JIS B 9620-1 with 32 films (2 cm × 2 cm) of the non-image portion of the printed web-shaped substrate to be printed at the printed portion of the web-shaped substrate to be printed with non-white aqueous ink stacked, the reflection density D0 measured in accordance with JIS B 9620-1 with 32 films (2 cm × 2 cm) of the unprinted web-shaped substrate to be printed stacked is subtracted, and the value (D1 - D0) is preferably 0.35 or less.

Advantages of the Invention

[0019] According to the present invention, a remarkable effect is achieved in that it is possible to provide a gravure plate with improved ghosting problems, a method for manufacturing the same, and a method for manufacturing a gravure printed matter using the same, as compared with a gravure plate having its surface coated with chromium plating.

Embodiments for Carrying Out the Invention

[0020] Embodiments of the present invention will be described below. These are shown by way of example, and it goes without saying that various modifications are possible without departing from the technical idea of the present invention.

[0021] The gravure plate of the present invention is a cylindrical gravure plate having a plate surface including an image portion and a non-image portion formed on the surface thereof for printing a web-shaped substrate to be printed with gravure ink, and includes a gravure cylinder body, an image portion and a non-image portion formed on the surface of the gravure cylinder body, and a DLC-Si layer formed so as to cover the image portion and the non-image portion.

[0022] The gravure plate of the present invention can be manufactured by a method including a step of preparing a gravure cylinder body having an image portion and a non-image portion formed on the surface thereof, and a step of coating the image portion and the non-image portion with DLC-Si.

[0023] As an embodiment of the cylindrical gravure plate of the present invention, an example of the manufacturing process will be described. First, a plate base material is prepared. The plate base material is preferably made of at least one material selected from the group consisting of nickel, tungsten, chromium, titanium, gold, silver, platinum, stainless steel, iron, copper, and aluminum. Needless to say, since it is at least one material, it may be an alloy. In addition, CFRP (carbon fiber reinforced plastic) is also applicable as the plate base material.

[0024] Next, a copper plating layer is formed on the surface of the plate base material by plating. This is the gravure cylinder body. And, a recessed layer with a large number of minute recesses (gravure cells) is formed on the surface of the copper plating layer. As a method for forming the recessed layer, known methods such as an etching method (after applying a photosensitive solution to the surface of the plate cylinder and directly baking it, then etching to form gravure cells) or an electron engraving method (mechanically operating a diamond engraving needle by a digital signal to engrave gravure cells on the copper surface) can be used, but the etching method is preferred. The recesses (gravure cells) on the plate surface of the gravure plate become the image areas, and the areas where the recesses on the plate surface are not formed become the non-image areas. Incidentally, the image areas may also be called ruled areas, and the non-image areas may also be called non-ruled areas.

[0025] Next, a DLC-Si layer is formed so as to cover the image areas and non-image areas. The DLC-Si layer is a carbon film in which silicon is doped into diamond-like carbon. The formation of the DLC-Si layer is effective in that a uniform film can be formed even for the recesses of the gravure cells by the plasma CVD method. The doping amount of Si is preferably 30 to 55 wt%. The thickness of the DLC-Si layer is preferably 1.0 μm to 10.0 μm, and more preferably 3.0 μm to 5.0 μm.

[0026] Before providing the DLC-Si layer, it is preferable to provide an under-metal layer such as nickel on the cylinder on which the gravure cells are formed.

[0027] By coating with the DLC-Si layer described above, a gravure plate is obtained in which the water repellency of the plate surface is improved, the ink scraping property by the doctor blade is improved, and the plate doubling is improved.

[0028] The water repellency can be evaluated by the contact angle. The gravure plate of the present invention has a contact angle of 70 degrees or more, preferably 80 degrees or more, with respect to water on the plate surface. In addition, when using, as the gravure ink, an alcohol-free aqueous ink having water as the main solvent, it is preferable that the contact angle of the gravure plate surface with respect to the alcohol-free aqueous ink is 30 degrees or more, and more preferably 40 degrees or more. The contact angle can be measured according to JIS R 3257.

[0029] The gravure ink used for printing using the gravure plate of the present invention is not particularly limited, and known gravure inks can be widely used. The gravure plate of the present invention can significantly improve ink doubling in both cases of oil-based inks and water-based inks. As described above, in recent years, a switch from oil-based inks to water-based inks has been desired, but water-based inks have had a problem of ink doubling. By using the gravure plate of the present invention, the problem of ink doubling can be solved not only for oil-based inks but also for water-based inks. As the water-based ink, either an alcohol-containing aqueous ink having water and alcohol as the main components of the solvent or an alcohol-free aqueous ink having water as the main component of the solvent and not containing alcohol can be used, and the problem of ink doubling can be solved in any water-based ink.

[0030] Conventionally, the presence or absence and degree of ink doubling have been visually confirmed, and in particular, it has been difficult to quantify the degree of doubling for white ink. However, the inventors of the present application have found that by comparing the glossiness of the plate surface before and after printing, the degree of doubling can be quantified for both white ink and non-white color inks.

[0031] When there is a lot of ink doubling in the printed matter, the rate of change in the glossiness of the plate surface before and after printing increases. When ink remains on the plate surface after printing, the glossiness decreases compared to before printing (i.e., before ink application). Although the glossiness varies depending on the material of the plate surface, by comparing the glossiness of the plate surface before and after printing, the amount of ink remaining on the plate surface that has passed through the gap between the doctor blade and the plate surface can be quantified. The rate of change in glossiness varies depending on the composition of the ink used (such as the presence or absence of alcohol content). However, in the gravure plate of the present invention, plate doubling is significantly improved, and for any of the alcohol-containing aqueous ink, alcohol-free aqueous ink, and oil-based ink, the rate of change in glossiness Gs of the surface of the gravure plate before and after printing calculated by the following formula (1) Δ (%) can be set to 3% or less. The rate of change in glossiness Gs Δ ={(Gs0 - Gs1) / Gs0}×100 ···(1) In the above formula (1), Gs0 is the 20-degree specular glossiness of the surface of the gravure plate before printing, measured based on JIS Z 8741, Gs1 is the 20-degree specular glossiness of the surface of the gravure plate after printing, measured based on JIS Z 8741.

[0032] Also, when printing with a non-white aqueous ink, if there is a lot of plate doubling in the printed matter, the reflection density will be a high value. Therefore, by subtracting the value of the reflection density D0 of the film in the unprinted state from the value of the reflection density D1 of the non-image part of the printed film, the calculated value (D1 - D0) can be evaluated as the degree of plate doubling. The reflection density can be measured in accordance with JIS B 9620-1. In this specification, each reflection density (D1 and D0) is measured in accordance with JIS B 9620-1 by stacking 32 films (2 cm × 2 cm) of the web-like substrate to be printed. By using the gravure plate of the present invention, the difference in reflection density (i.e., the value of the degree of plate doubling: D1 - D0) at the printed part of the web-like substrate to be printed with a non-white aqueous ink can be made 0.35 or less. The degree of plate doubling (D1 - D0) depends on the material of the substrate to be printed, but is preferably 0.35 or less, and more preferably 0.15 or less.

[0033] Furthermore, according to the present invention, it is possible to provide a gravure plate that sufficiently satisfies the hardness required for a gravure plate. The Vickers hardness of the surface of the printing surface of the gravure plate (i.e., the surface of the DLC-Si layer) is preferably HV800 or more, more preferably HV900 or more and 1500 or less, and even more preferably HV1000 or more and 1300 or less.

[0034] The method for manufacturing a gravure printed matter of the present invention includes a step of printing on a web-shaped substrate to be printed using the gravure plate to manufacture a gravure printed matter. There is no particular limitation on the web-shaped substrate to be printed, and a known web-shaped substrate may be appropriately selected as needed.

Examples

[0035] The present invention will be described in more detail with reference to the following examples. It goes without saying that these examples are illustrative and should not be construed in a limiting sense.

[0036] (Example 1) <Production of the gravure plate of the present invention (hereinafter referred to as a water-repellent DLC plate)> A plate base material (aluminum hollow roll) with a circumference of 600 mm and a surface length of 1100 mm was prepared, and a cylindrical gravure plate (gravure cylinder, gravure plate-making roll) described later was manufactured using NewFX (a fully automatic laser gravure plate-making system manufactured by Sink Laboratory Co., Ltd.). First, the plate base material (aluminum hollow roll), which is the roll to be processed, was installed in a copper plating bath, and the hollow roll was completely immersed in the plating solution to form a 40-μm copper plating layer at 30 A / dm 2 , 6.0 V. There were no bumps or pits on the plated surface, and a uniform copper plating layer serving as a base material was obtained. The surface of this copper plating layer was polished using a two-head type polishing machine (a polishing machine manufactured by Sink Laboratory Co., Ltd.) to make the surface of the copper plating layer a uniform polished surface.

[0037] Next, a photosensitive material [thermal resist: TSER2104E4 (manufactured by Shin K Laboratories, Ltd.)] was applied to the surface of the roll to be processed on which the copper plating layer was formed (using a fountain coater) and dried. The film thickness of the obtained photosensitive material was measured with a film thickness gauge (F20 manufactured by FILLMETRICS) and found to be 4.5 μm. Next, the image was laser-exposed and developed. The above laser exposure was performed using Laser Stream FX (manufactured by Shin K Laboratories, Ltd.) under the exposure condition of 300 mJ / cm 2 to perform a predetermined pattern exposure. Also, the above development was carried out using a TLD developer (developer manufactured by Shin K Laboratories, Ltd.) at a developer dilution ratio (stock solution 1: water 7) at 24 °C for 90 seconds to form a predetermined resist pattern. Next, using the resist pattern formed above as an etching mask, the copper plating layer was corroded. Cupric chloride solution was used as the corrosion solution, and it was carried out by spraying at 35 °C for 100 seconds. Then, using sodium hydroxide, it was carried out at a dilution ratio of 20 g / L at 40 °C for 180 seconds to remove the resist of the resist pattern. In this way, a large number of recesses (gravure cells) in the shape of a square with a side length of 100 μm in the solid part with a depth of 10 μm were formed.

[0038] Next, the cylinder on which the gravure cells were formed was installed in a nickel plating bath, immersed in the nickel plating solution, and a nickel plating layer with a thickness of 4 μm was formed at 5 A / dm 2 and 5.0 V.

[0039] Then, a DLC-Si layer was formed so as to cover the recesses (gravure cells) and the non-image part which are the image parts. The DLC-Si layer was formed by the plasma CVD method. The thickness of the DLC-Si layer was 3.0 μm. The doping amount of Si was 45 wt%. In this way, the water-repellent DLC plate according to Example 1 was manufactured.

[0040] <Measurement of the hardness of the plate surface> When the hardness of the plate surface of the obtained water-repellent DLC plate was measured with a Vickers hardness tester (HM-200 manufactured by Mitutoyo Corporation), the Vickers hardness was HV1200.

[0041] <Evaluation of Plate Doubling> Using the gravure version of the obtained water-repellent DLC (water-repellent DLC version), three types of gravure inks [aqueous ink A: an alcohol-free aqueous gravure ink (composed of 65% water, 20% binder resin, 8% pigment, and 7% other additives) with water as the main solvent], aqueous ink B: an alcohol-containing aqueous gravure ink (manufactured by Toyo Ink Co., Ltd., Aqua Ecoal) with water and alcohol as the main solvents, and an oil-based ink (manufactured by DIC Corporation, Finart)] were used to perform white and non-white printing, and the degree of plate doubling was evaluated visually and by the following measurements. The printing was performed using a gravure printing machine manufactured by Orient Shoji Co., Ltd. under the condition of a printing speed of 150 m / min. In addition, since non-white inks other than white ink (black, cyan, magenta, yellow) basically show the same tendency, Tables 1 to 3 show the results using cyan or magenta as representative colors for non-white inks. Visual observation was evaluated according to the following evaluation criteria. The results are shown in Tables 1 to 3. 〇: No plate doubling, △: Slight plate doubling, ×: Plate doubling.

[0042] 1) Evaluation by Measuring the Change Rate of Glossiness Regarding the glossiness of the plate surface of the gravure plate before and after printing, based on JIS Z 8741, the 20-degree specular gloss: Gs(20°) was measured using a gloss meter (manufactured by Rhopoint instruments, Rhopoint IQ Flex 20), and the change rate of glossiness Gs Δ was calculated by the above formula (1). Three points at the center and both ends of the plate surface were measured, and the average value was taken as the measured value. A PET (Polyethylene terephthalate) film was used as the web-like substrate to be printed. The results are shown in Tables 1 to 3.

[0043]

Table 1

[0044]

Table 2

[0045]

Table 3

[0046] 2) Evaluation based on the difference in the reflection density of the web-like substrate to be printed before and after printing using non-white aqueous ink 2-1) Measurement of the reflection density D0 of the non-printed film As the web-like substrate to be printed, films of PET (Polyethylene terephthalate) and OPP (Oriented Polypropylene) were prepared. The reflection density of a 2 cm × 2 cm film was measured according to JIS B 9620-1. However, in order to increase the density value of the reflection density, 32 sheets of the 2 cm × 2 cm film were stacked, and the reflection density was measured using a reflection densitometer (eXact Basic manufactured by X-Rite).

[0047] 2-2) Measurement of the reflection density D1 of the non-image part of the printed film As the web-like substrate to be printed, films of PET (Polyethylene terephthalate) and OPP (Oriented Polypropylene) were prepared, and using the aqueous ink A, each color other than white (black, cyan, magenta, yellow) was printed (gravure printing machine manufactured by Orient Corporation, printing speed 150 m / min). The measurement of the reflection density was carried out by measuring the reflection density of the non-image part film (2 cm × 2 cm) of the printed web-like substrate to be printed according to JIS B 9620-1. However, in order to increase the density value of the reflection density, 32 sheets were stacked, and the reflection density of the color at the printed part was measured using a reflection densitometer (eXact Basic manufactured by X-Rite), and evaluated by the reflection density of the color at the printed part.

[0048] 2-3) Calculation of the degree of plate doubling (D1 - D0) The value obtained by subtracting the reflection density D0 of the film in the unprinted state from the value of the reflection density D1 of the non-image area of the printed film described above was used as the value of the degree of plate doubling. The results of the degree of plate doubling (D1 - D0) of the printed matter using the non-white aqueous ink are shown in Tables 4 and 5.

[0049]

Table 4

[0050]

Table 5

[0051] <Measurement of contact angle> Using the above-prepared gravure plate of water-repellent DLC (water-repellent DLC plate), the contact angles of the plate surface of the gravure plate with respect to water, the aqueous gravure ink A (non-white aqueous gravure ink without alcohol), and the aqueous gravure ink B (non-white aqueous gravure ink containing alcohol) were measured. The measurement method was carried out according to JIS R 3257. The results are shown in Table 6.

[0052]

Table 6

[0053] (Comparative Examples 1 and 2) As Comparative Example 1, a chrome-plated gravure plate prepared in the same manner as the above-described water-repellent DLC plate was prepared, except that the image area and non-image area formed on the surface of the gravure cylinder body were coated with conventional chrome plating instead of DLC-Si. It was mounted in a chrome plating bath and completely immersed in the chrome plating solution to form an 8-μm chrome plating layer at 35 A / dm 2 , 6.0 V. The Vickers hardness of the plate surface of the gravure plate was HV1000. As Comparative Example 2, a gravure plate was prepared in which the image portion and non-image portion formed on the surface of the gravure cylinder body were coated with ordinary DLC not doped with silicon instead of DLC-Si. The ordinary DLC was coated by reactive sputtering. The thickness of the layer was 3 μm. Similar to Example 1, after forming a 2-μm nickel under-metal layer, the nickel under-metal layer was coated with DLC to form a DLC coating layer. The Vickers hardness of the plate surface of the gravure plate was HV1500.

[0054] For each of the gravure plates obtained in Comparative Examples 1 and 2, evaluation of plate doubling and measurement of contact angle were performed in the same manner as in Example 1. The results are shown in Tables 1 to 6.

[0055] As shown in Tables 1 to 5, when measuring the degree of plate doubling (visual inspection, change rate of glossiness, D1 - D0) of printed matter with aqueous ink, for all colors in both PET and OPP, the water-repellent DLC plate with the DLC-Si layer of Example 1 was lower than those of Comparative Examples 1 and 2. Also, as shown in Table 6, in the water-repellent DLC gravure plate of Example 1, the contact angles with respect to water and aqueous ink are higher than those of the chromium-plated gravure plate of Comparative Example 1 and the ordinary DLC gravure plate of Comparative Example 2. This is considered to be effective against plate doubling.

[0056] (Comparative Example 3) As Comparative Example 3, a water-repellent DLC plate similar to that of Example 1 described above was produced, except that the image portion and non-image portion formed on the surface of the gravure cylinder body were coated with F-DLC in which fluorine was doped into DLC instead of DLC-Si. Similar to Example 1, after forming a 2-μm nickel under-metal layer, the nickel under-metal layer was coated with DLC to form an F-DLC coating layer. The film formation method of the F-DLC coating layer was performed by plasma ion implantation.

[0057] The thickness of the F-DLC layer was 3 μm. The fluorine-doped F-DLC was polymer-like and had a Vickers hardness of HV100. Usually, the hardness required for a gravure plate is HV800 - 1000. If it is below this hardness, wear will occur quickly. With a Vickers hardness of HV100, it falls far short of the hardness required for a gravure plate and was not suitable as a gravure plate.

Claims

1. A cylindrical gravure plate having a plate surface including an image area and a non-image area formed on the surface thereof for printing on a web-shaped substrate to be printed with gravure ink, a gravure cylinder body, image areas and non-image areas formed on the surface of the gravure cylinder body, a DLC-Si layer formed so as to cover the image areas and the non-image areas, wherein, the contact angle of the plate surface of the gravure plate with respect to water is 70 degrees or more, The change rate Gs of the glossiness of the surface of the gravure plate before and after printing calculated by the following formula (1) Δ The gravure plate, wherein the change rate Gs (%) is 3% or less. Rate of change of glossiness Gs Δ = { (Gs ０ - Gs １ ) / Gs ０} × 100... (1) (In the formula (1), Gs ０ is the 20-degree specular gloss of the plate surface of the gravure plate before printing, measured based on JIS Z 8741, Gs １ is the 20-degree specular gloss of the plate surface of the gravure plate after printing, measured based on JIS Z 8741.)

2. The gravure plate according to claim 1, wherein the thickness of the DLC-Si layer is 1.0 μm to 10.0 μm.

3. The gravure plate according to claim 1, wherein the gravure ink is aqueous ink.

4. The reflection density D measured in accordance with JIS B 9620-1 by stacking 32 films (2 cm × 2 cm) of the non-image part of the printed web-like substrate to be printed at the printed part of the web-like substrate to be printed with the non-white aqueous ink １ from which the reflection density D measured in accordance with JIS B 9620-1 by stacking 32 films (2 cm × 2 cm) of the unprinted web-like substrate to be printed is subtracted ０ The value obtained by subtracting (D １ − D ０ ) is 0.35 or less. The gravure plate according to claim 1

5. wherein the aqueous ink is alcohol-free aqueous ink, and the contact angle of the plate surface of the gravure plate with respect to the alcohol-free aqueous ink is 30 degrees or more. The gravure plate according to claim 3.

6. The gravure plate according to claim 1, wherein the Vickers hardness Hv of the plate surface of the gravure plate is 800 or more.

7. A method for manufacturing a gravure plate, which is a method for manufacturing a gravure plate according to any one of claims 1 to 6, comprising the steps of preparing a gravure cylinder body having image areas and non-image areas formed on the surface thereof, and coating the image areas and the non-image areas with DLC-Si. A method for manufacturing a gravure plate.

8. A method for manufacturing a gravure printed matter, which is a method for printing a web-shaped substrate to be printed using the gravure plate according to any one of claims 1 to 6, The change rate Gs of the glossiness of the plate surface of the gravure plate before and after printing calculated by the following formula (1) Δ The manufacturing method of the gravure printed matter, wherein the change rate Gs (%) is 3% or less. Change rate of glossiness Gs Δ = { (Gs ０ - Gs １ ) / Gs ０} × 100... (1) (In the formula (1), Gs ０ is the 20-degree specular gloss of the plate surface of the gravure plate before printing, measured based on JIS Z 8741, Gs １ is the 20-degree specular glossiness of the plate surface of the gravure plate after printing, measured based on JIS Z 8741.)

9. The reflection density D measured in accordance with JIS B 9620-1 by stacking 32 films (2 cm × 2 cm) of the non-image part of the printed web-like substrate to be printed at the printed part of the web-like substrate to be printed with non-white aqueous ink １ from the reflection density D measured in accordance with JIS B 9620-1 by stacking 32 films (2 cm × 2 cm) of the non-printed web-like substrate to be printed ０ The value obtained by subtracting (D １ − D ０ ) is 0.35 or less. The method for manufacturing a gravure printed matter according to claim 8

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