Intaglio plate, method for producing the same, and method for producing intaglio printed matter using the intaglio plate

Abstract

The present invention provides an intaglio plate having improved plate fogging problem compared with an intaglio plate whose surface is coated with chrome plating, a method for manufacturing the same, and a method for manufacturing an intaglio printed product using the intaglio plate. A cylindrical intaglio plate for printing on a strip-shaped printed substrate with an intaglio ink, having a plate surface including an image portion and a non-image portion formed on the surface, the intaglio plate comprising: an intaglio cylinder; an image portion and a non-image portion formed on the surface of the intaglio cylinder; and a DLC-Si layer formed in a manner covering the image portion and the non-image portion, the contact angle of the plate surface of the intaglio plate relative to water being 70 degrees or more, and the glossiness change rate of the plate surface of the intaglio plate before and after printing being 3% or less.

Description

Technical Field

[0001] The present invention relates to a cylindrical intaglio plate for intaglio printing with improved plate fogging, a method for manufacturing the same, and a method for manufacturing an intaglio-printed product using the intaglio plate. Background Art

[0002] In gravure printing, tiny recesses (cells) corresponding to the platemaking information are formed on the hollow cylindrical cylinder to be processed to produce the plate surface of the gravure cylinder, and the cells are filled with ink and transferred to the printed object. A general cylindrical gravure (also called a gravure cylinder or platemaking roller) uses a cylindrical iron core or aluminum core (hollow roller) as a substrate, and multiple layers such as a base layer and a peeling layer are formed on the outer peripheral surface of the substrate, and a plating layer such as copper plating is formed thereon. In addition, on the plating layer such as copper plating, cells corresponding to the platemaking information are formed by a laser exposure device, and then chrome plating is applied to increase the brush resistance of the gravure cylinder to complete the platemaking (platemaking).

[0003] Generally speaking, the ink used for gravure printing is oily, and it is desirable to make it water-based due to various problems. In water-based ink, due to the high water content, the drying load is large and the printing speed cannot be increased. In order to make the printing speed equal to that of oily 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 the water-based ink is increased and the amount of the water-based ink used is reduced, as a disadvantage, in the non-image area, when the water-based ink that has passed between the gravure cylinder and the scraper is transferred to the strip-shaped printing substrate such as a film, coloring occurs regardless of whether it is a non-image area. This phenomenon is called "plate fogging."

[0005] The fogging is a phenomenon that becomes more prominent as the ink becomes thicker. The surface of the gravure cylinder used in gravure printing is chrome plated in the above manner in order to withstand the friction with the scraper.

[0006] For example, in the gravure printing apparatus as shown in Patent Document 1, although it is conceivable to eliminate the plate fogging, in the case of the gravure printing apparatus as shown in Patent Document 1, in order to eliminate the plate fogging, a special printing apparatus different from a general gravure printing apparatus is required. Therefore, a gravure plate (gravure cylinder) that can eliminate the plate fogging even without the gravure printing apparatus as shown in Patent Document 1 is desired.

[0007] However, in the case of the gravure plate whose surface is coated with chrome, the problem of plate fogging cannot be eliminated despite repeated trials.

[0008] Prior Art Literature

[0009] Patent Literature

[0010] Patent Document 1: Patent Publication No. WO2018 / 003618 Summary of the invention

[0011] Problems to be solved by the invention

[0012] After intensive research, the inventors discovered that by replacing chrome plating with DLC doped with silicon to increase its hydrophobicity, the surface of the gravure plate can be coated. Since the hydrophobicity of the surface is increased, the scraping property of the ink using a scraper becomes better, and the plate atomization is improved, thus achieving the present invention.

[0013] That is, the present invention is made in view of the problems of the above-mentioned prior art, and its purpose is to provide a gravure plate and a method for manufacturing a gravure printed product using the gravure plate, which improves the problem of plate fogging compared to a gravure plate coated with a chrome plate.

[0014] Methods for solving problems

[0015] In order to solve the above-mentioned problems, the gravure plate of the present invention is a cylindrical gravure plate for printing on a strip-shaped printed substrate with gravure ink, and having a plate surface including an image portion and a non-image portion formed on the surface, wherein the gravure plate comprises: 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 in a manner covering the image portion and the non-image portion, wherein the contact angle of the plate surface of the gravure plate with respect to water is 70 degrees or more, and the glossiness change rate Gs of the plate surface of the gravure plate before and after printing is calculated by the following formula (1): ∆ (%) is less than 3%.

[0016] Gloss change rate Gs ∆ ={(Gs0-Gs1) / Gs0}×100・・・(1)

[0017] In the formula (1),

[0018] Gs0 is the 20-degree specular gloss of the gravure plate surface before printing measured based on JIS Z 8741.

[0019] Gs1 is the 20-degree specular glossiness of the surface of the gravure plate after printing measured in accordance with JIS Z 8741.

[0020] The thickness of the DLC-Si layer is preferably 1.0 μm to 10.0 μm.

[0021] The gravure ink is preferably an aqueous ink.

[0022] When the aqueous ink is an aqueous ink not containing ethanol, the contact angle of the plate surface of the intaglio plate with respect to the aqueous ink not containing ethanol is preferably 30 degrees or more.

[0023] In the gravure plate, a value (D1-D0) obtained by subtracting a reflection density D0 from a reflection density D1 measured in accordance with JIS B 9620-1 by overlapping 32 pieces of a film (2 cm×2 cm) of a non-image portion of a printed strip-shaped printed substrate in a printed portion of a strip-shaped printed substrate printed with a non-white aqueous ink, and a value (D1-D0) obtained by overlapping 32 pieces of a film (2 cm×2 cm) of an unprinted strip-shaped printed substrate and measuring in accordance with JIS B 9620-1.

[0024] The Vickers hardness Hv of the surface of the intaglio plate is preferably 800 or more.

[0025] The gravure plate manufacturing method of the present invention is a gravure plate manufacturing method for manufacturing the gravure plate, wherein the gravure plate manufacturing method includes: a step of preparing a gravure plate 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.

[0026] The method for producing a gravure printed article of the present invention is a method for producing a gravure printed article by printing on a belt-shaped printing substrate using the gravure plate, wherein the rate of change in glossiness of the gravure plate surface before and after printing calculated by the following formula (1) is 3% or less.

[0027] Glossiness change rate = {(Gs0-Gs1) / Gs0}×100 ・・・(1)

[0028] In the formula (1),

[0029] Gs0 is the 20-degree specular gloss of the gravure plate surface before printing measured based on JIS Z 8741.

[0030] Gs1 is the 20-degree specular glossiness of the surface of the gravure plate after printing measured in accordance with JIS Z 8741.

[0031] In the method for manufacturing the gravure printed material, the value (D1-D0) obtained by subtracting the reflection density D0 from the reflection density D1 is preferably 0.35 or less, the reflection density D1 being measured according to JIS B 9620-1 by overlapping 32 pieces of film (2 cm×2 cm) of the non-image portion of the printed strip-shaped printed substrate in the printed portion of the strip-shaped printed substrate printed with non-white aqueous ink, and the reflection density D0 being measured according to JIS B 9620-1 by overlapping 32 pieces of film (2 cm×2 cm) of the unprinted strip-shaped printed substrate.

[0032] Effects of the Invention

[0033] According to the present invention, it is possible to provide a significant effect of being able to provide a gravure plate having a surface coated with chrome that improves the problem of plate fogging, a method for producing the same, and a method for producing a gravure printed matter using the gravure plate. DETAILED DESCRIPTION

[0034] Hereinafter, embodiments of the present invention will be described. However, these are merely illustrative and various modifications are possible without departing from the technical scope of the present invention.

[0035] The gravure plate of the present invention is a cylindrical gravure plate for printing on a belt-shaped printed substrate with gravure ink, and has a plate surface including an image portion and a non-image portion formed on the surface. The gravure plate includes: a gravure drum body; an image portion and a non-image portion formed on the surface of the gravure drum body; and a DLC-Si layer formed in a manner covering the image portion and the non-image portion.

[0036] The gravure plate of the present invention can be produced by a method including the steps of: preparing a gravure plate cylinder body having an image portion and a non-image portion formed on the surface; and coating the image portion and the non-image portion with DLC-Si.

[0037] As one embodiment of the cylindrical intaglio plate of the present invention, an example of a production process will be described.

[0038] First, prepare a plate mother material. The plate mother material is preferably composed of at least one material selected from the group consisting of nickel, tungsten, chromium, titanium, gold, silver, platinum, stainless steel, iron, copper, and aluminum. In addition, since it is at least one material, it can of course also be an alloy. Moreover, CFRP (carbon fiber reinforced plastic) can also be used as a plate mother material.

[0039] Next, a copper-plated layer is formed on the surface of the plate mother material by plating. This is the gravure cylinder body. Then, a concave layer is formed on the surface of the copper-plated layer, and a plurality of tiny concave portions (intaglio units) are formed in the concave layer. As a method for forming the concave layer, known methods such as etching (after applying a photosensitive liquid to the surface of the plate body and directly sintering it, etching is performed to form intaglio units) or electronic engraving (by using a digital signal to mechanically move a diamond engraving needle to engrave intaglio units on the copper surface) can be used, but etching is preferred. The concave portions (intaglio units) of the gravure plate surface become image portions, and the portions of the plate surface where no concave portions are formed become non-image portions. In addition, the image portion is also referred to as a ruled portion, and the non-image portion is also referred to as a non-ruled portion.

[0040] Next, a DLC-Si layer is formed in a manner covering the image portion and the non-image portion. The DLC-Si layer is a carbon film formed by doping diamond-like carbon with silicon. The formation of the DLC-Si layer is effective in forming a uniform coating on the concave portion of the gravure unit using a plasma CVD method. The doping amount of Si is preferably 30 to 55 wt%.

[0041] The thickness of the DLC-Si layer is preferably 1.0 μm to 10.0 μm, more preferably 3.0 μm to 5.0 μm.

[0042] Before providing the DLC-Si layer, it is preferred that a base metal layer such as nickel is provided on the drum on which the intaglio unit is formed.

[0043] By coating with the above-mentioned DLC-Si layer, the hydrophobicity of the plate surface is improved, the scraping property of the ink using a doctor blade is improved, and the plate fogging is improved to obtain a gravure plate.

[0044] The hydrophobicity can be evaluated by the contact angle. In the intaglio plate of the present invention, the contact angle of the plate surface with respect to water is 70 degrees or more, preferably 80 degrees or more.

[0045] In addition, when using an aqueous ink containing no ethanol and using water as a main solvent as the gravure ink, the contact angle of the gravure plate surface with respect to the aqueous ink containing no ethanol is preferably 30 degrees or more, more preferably 40 degrees or more. The contact angle can be measured in accordance with JIS R 3257.

[0046] The gravure ink used in the printing using the gravure of the present invention is not particularly limited, and known gravure inks can be widely used. The gravure of the present invention can significantly improve the plate atomization in any case of oily ink and water-based ink. As mentioned above, in recent years, although it is desired to replace the oily ink with water-based ink, the water-based ink has the problem of plate atomization. By using the gravure of the present invention, not only oily ink, but also water-based ink can solve the problem of plate atomization. As water-based ink, any one of the ethanol-containing water-based ink with water and ethanol as the main components of the solvent and the non-ethanol-containing water-based ink with water as the main component of the solvent but not containing ethanol can be used, and any one of the water-based inks can solve the problem of plate atomization.

[0047] In the past, the presence and degree of plate fogging were confirmed visually, and it was difficult to quantify the degree of fogging, especially for white ink. However, the inventors of this case found that by comparing the glossiness of the plate surface before and after printing, the degree of fogging can be quantified for both white ink and non-white color ink.

[0048] When the printed material has a lot of plate fogging, the rate of change in the glossiness of the plate before and after printing becomes larger. When ink remains on the plate 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, by comparing the glossiness of the plate before and after printing, the amount of ink that passes between the scraper and the plate and remains on the plate can be quantified.

[0049] Although the glossiness change rate varies depending on the composition of the ink used (whether it contains ethanol, etc.), the gravure plate of the present invention has significantly improved plate fogging, and the gravure plate surface glossiness change rate Gs before and after printing calculated by the following formula (1) can be made to be: ∆ (%) is less than 3%.

[0050] Gloss change rate Gs ∆ ={(Gs0-Gs1) / Gs0}×100・・・(1)

[0051] In the formula (1),

[0052] Gs0 is the 20-degree specular gloss of the gravure plate surface before printing measured based on JIS Z 8741.

[0053] Gs1 is the 20-degree specular glossiness of the surface of the gravure plate after printing measured in accordance with JIS Z 8741.

[0054] In addition, when printing is performed using non-white aqueous ink, if the printed material has a lot of plate fogging, the reflection density value increases. Therefore, the value (D1-D0) calculated by subtracting the reflection density D0 of the unprinted film from the reflection density D1 of the non-image portion of the printed film can be used to evaluate the degree of plate fogging.

[0055] The reflection density can be measured in accordance with JIS B 9620-1. In the present application specification, each reflection density (D1 and D0) is measured by overlapping 32 sheets of a film (2 cm×2 cm) of a strip-shaped printed substrate and measuring it in accordance with JIS B 9620-1. By using the gravure plate of the present invention, the difference in reflection density in the printed portion of the strip-shaped printed substrate printed with a non-white aqueous ink (i.e., the value of the degree of plate fogging: D1-D0) can be made 0.35 or less. Although the degree of plate fogging (D1-D0) depends on the material of the printed substrate, it is preferably 0.35 or less, and more preferably 0.15 or less.

[0056] Furthermore, according to the present invention, a gravure plate that satisfies the hardness required for a gravure plate can be provided. The Vickers hardness of the gravure plate surface (i.e., the surface of the DLC-Si layer) is preferably HV800 or more, more preferably HV900 or more and 1500 or less, and further preferably HV1000 or more and 1300 or less.

[0057] The method for producing a gravure-printed article of the present invention includes the step of printing a belt-shaped printing substrate using the gravure plate to produce the gravure-printed article.

[0058] The strip-shaped printing substrate is not particularly limited, and a known strip-shaped substrate may be appropriately selected as required.

[0059] Example

[0060] The present invention will be further specifically described below with reference to Examples. However, these Examples are only intended to illustrate the present invention and are not intended to limit the present invention.

[0061] (Example 1)

[0062] <Production of the Gravure Plate of the Present Invention (hereinafter referred to as the Hydrophobic DLC Plate)>

[0063] A plate base material (hollow aluminum roll) having 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 below was produced using NewFX (fully automatic laser gravure plate-making system manufactured by THINKLABORATORY Co., Ltd.).

[0064] First, the treated roll, i.e. the base material (hollow aluminum roll), is installed in the copper plating tank, and the hollow roll is completely immersed in the plating solution and the copper plating is carried out at 30A / dm. 2 , 6.0 V to form a 40 μm copper plating layer. No pits or dents were generated on the plated surface, and a uniform copper plating layer was obtained as a substrate. The surface of the copper plating layer was polished using a two-head grinder (THINK LABORATORY Co., Ltd. grinder) to make the surface of the copper plating layer a uniform polished surface.

[0065] Next, a photosensitive material [thermal resistance: TSER2104E4 (manufactured by THINK LABORATORY Co., Ltd.)] was applied (spray coater) to the surface of the treated roller having the copper plating layer formed thereon and dried. The film thickness of the obtained photosensitive material was measured with a film thickness meter (F20 manufactured by FILLMETRICS) and found to be 4.5 μm.

[0066] Next, the image was exposed to laser light and developed. Laser Stream FX (manufactured by THINKLABORATORY Co., Ltd.) was used for the laser exposure under the exposure conditions of 300 mJ / cm 2 The development was performed using TLD developer (developer produced by THINK LABORATORY Co., Ltd.) at a developer dilution ratio (stock solution 1: water 7) at 24° C. for 90 seconds to form a predetermined resist pattern.

[0067] Next, the copper plating layer was etched using the resist pattern formed as an etching mask. The etching solution used was a cupric chloride solution, which was sprayed at 35°C for 100 seconds. Next, sodium hydroxide was used at a dilution ratio of 20 g / L and at 40°C for 180 seconds to remove the resist pattern.

[0068] In this way, a plurality of square recessed portions (intaglio cells) having a depth of 10 μm and a side length of 100 μm at the solid portion were formed.

[0069] Next, the drum with the gravure unit formed thereon was installed in a nickel plating tank, half of which was immersed in the nickel plating solution and heated at 5 A / dm 2 , 5.0V forms a 4μm nickel plating layer.

[0070] Next, a DLC-Si layer was formed to cover the concave portion (gravure unit) as the image portion and the non-image portion. The DLC-Si layer was formed by a 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 hydrophobic DLC plate of Example 1 was prepared.

[0071] <Measurement of hardness of plate surface>

[0072] The hardness of the plate surface of the obtained hydrophobic DLC plate was measured with a Vickers hardness meter (HM-200 manufactured by Mitutoyo Co., Ltd.), and the result showed that the Vickers hardness was HV1200.

[0073] <Evaluation of the fogging of the board>

[0074] Using the obtained hydrophobic DLC gravure (hydrophobic DLC plate), three kinds of gravure inks [aqueous ink A: aqueous gravure ink containing no ethanol using water as the main solvent (aqueous ink consisting of 65% water, 20% binder resin, 8% pigment, and 7% other additives), aqueous ink B: aqueous gravure ink containing ethanol using water and ethanol as the main solvent (Toyo Ink Co., Ltd., AQUAECOL), oily ink (DIC Co., Ltd., FINART)] were used for white and non-white printing, and the degree of plate fogging was evaluated by visual inspection and the following measurement. Printing was performed using a gravure printing press made by ORIENT SOGYOCO., LTD. at a printing speed of 150 m / min. In addition, non-white inks (black, cyan, magenta, and yellow) other than white inks are basically expressed as the same tendency, so the results of using cyan or magenta as representative colors as non-white inks are shown in Tables 1 to 3.

[0075] Visual observation was performed and evaluation was performed according to the following evaluation criteria. The results are shown in Tables 1 to 3.

[0076] ○: no plate fogging, △: slight plate fogging, ×: plate fogging.

[0077] 1) Evaluation based on glossiness change rate measurement

[0078] The glossiness of the gravure plate surface before and after printing was measured using a gloss meter (Rhopoint Instruments, Rhopoint IQ Flex 20) in accordance with JIS Z 8741 to measure the 20-degree specular gloss: Gs(20°), and the glossiness change rate Gs was calculated using the above formula (1): ∆ . The values ​​were measured at three locations in the center and at both ends of the plate, and the average value was taken as the measured value. PET (Polyethylene terephthalate) film was used as the strip-shaped printed substrate. The results are shown in Tables 1 to 3.

[0079]

[0080]

[0081]

[0082] 2) Evaluation based on the difference in reflection density of the strip-shaped printed substrate before and after printing using non-white aqueous ink

[0083] 2-1) Measurement of reflection density D0 of unprinted film

[0084] PET (Polyethylene terephthalate) and OPP (Oriented Polypropylene) films were prepared as strip-shaped printed substrates. The reflection density of the 2cm×2cm film was measured in accordance with JIS B 9620-1. However, in order to increase the value of the reflection density, 32 pieces of the 2cm×2cm film were stacked and the reflection density was measured using a reflection densitometer (eXact Basic manufactured by X-Rite).

[0085] 2-2) Measurement of reflection density D1 of non-image area of ​​printed film

[0086] PET (Polyethylene terephthalate) and OPP (Oriented Polypropylene) films were prepared as strip-shaped printed substrates, and various colors (black, cyan, magenta, and yellow) other than white were printed using the aqueous ink A (gravure printing machine manufactured by ORIENT SOGYO CO., LTD., printing speed 150 m / min). The reflection density was measured according to JIS B 9620-1 by measuring the reflection density of the non-image portion of the printed strip-shaped printed substrate (2 cm×2 cm). However, in order to increase the value of the reflection density, 32 sheets were overlapped, and the reflection density of the color of the printed area was measured using a reflection densitometer (eXact Basic manufactured by X-Rite), and the reflection density of the color of the printed area was evaluated.

[0087] 2-3) Calculation of the degree of plate atomization (D1-D0)

[0088] The value (D1-D0) calculated by subtracting the reflection density D0 of the unprinted film in 1) from the reflection density D1 of the non-image portion of the printed film in 2) is used as the value of the plate fogging degree. The results of the plate fogging degree (D1-D0) of the printed material based on non-white aqueous ink are shown in Tables 4 and 5.

[0089]

[0090]

[0091] <Measurement of contact angle>

[0092] The contact angles of the hydrophobic DLC gravure plate (hydrophobic DLC plate) prepared above with respect to water, the aqueous gravure ink A (non-white aqueous gravure ink not containing ethanol), and the aqueous gravure ink B (non-white aqueous gravure ink containing ethanol) were measured on the surface of the gravure plate. The measurement method was performed in accordance with JIS R 3257. The results are shown in Table 6.

[0093]

[0094] (Comparative Examples 1 and 2)

[0095] As Comparative Example 1, a chrome-plated gravure plate was prepared in the same manner as the hydrophobic DLC plate except that the image portion and the non-image portion were formed on the surface of the gravure cylinder body by conventional chrome plating instead of DLC-Si. The gravure cylinder body was installed in a chrome plating tank, completely immersed in the chrome plating solution, and heated at 35 A / dm. 2 , 6.0 V to form an 8μm chrome plating layer. The Vickers hardness of the gravure plate surface is HV1000.

[0096] As Comparative Example 2, a DLC gravure was prepared in which the image part and the non-image part were formed on the surface of the gravure cylinder body by coating the conventional DLC without silicon instead of DLC-Si. The conventional DLC was coated by reactive sputtering. The thickness of the layer was 3 μm. In addition, as in Example 1, after forming a 2 μm nickel base metal layer, the nickel base metal layer was coated with DLC to form a DLC coating layer. The Vickers hardness of the gravure plate surface was HV1500.

[0097] For each of the intaglio plates obtained in Comparative Examples 1 and 2, evaluation of plate fogging and measurement of contact angle were performed in the same manner as in Example 1. The results are shown in Tables 1 to 6.

[0098] As shown in Tables 1 to 5, the results of measuring the degree of plate fogging of printed materials based on water-based ink (visual observation, rate of change in glossiness, D1-D0) showed that for all colors, the hydrophobic DLC plate with a DLC-Si layer formed in Example 1 was lower for PET and OPP than for Comparative Examples 1 and 2.

[0099] Furthermore, as shown in Table 6, the hydrophobic DLC intaglio plate of Example 1 has a higher contact angle with respect to water and aqueous ink than the chrome-plated intaglio plate of Comparative Example 1 and the normal DLC intaglio plate of Comparative Example 2. This is considered to have an effect on plate fogging.

[0100] (Comparative Example 3)

[0101] As Comparative Example 3, a hydrophobic DLC was prepared in the same manner as in Example 1 except that the image portion and the non-image portion formed on the surface of the gravure cylinder body were coated with F-DLC in which fluorine was doped in DLC instead of DLC-Si. In addition, after forming a 2 μm nickel base metal layer, the nickel base metal layer was coated with DLC to form an F-DLC coating layer in the same manner as in Example 1. The film formation of the F-DLC coating layer was performed by plasma ion implantation.

[0102] The thickness of the F-DLC layer is 3μm. F-DLC doped with fluorine is polymer-like and has a Vickers hardness of HV100. Usually, the hardness required for gravure is HV800~1000. If the hardness is lower than this, it will wear faster. The Vickers hardness of HV100 is far lower than the hardness required for gravure and is not suitable for gravure.

Claims

1. A gravure plate, which is a cylindrical gravure plate having a surface including an image portion and a non-image portion formed on the surface thereof, for printing on a strip-shaped printed substrate with gravure ink, wherein: The intaglio contains: 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 is formed so as to cover the image portion and the non-image portion, The contact angle of the gravure plate surface with respect to water is greater than 70 degrees. The glossiness change rate Gs of the gravure plate surface before and after printing is calculated by the following formula (1): ∆ (%) is less than 3%, Gloss change rate Gs ∆ ={(Gs0-Gs1) / Gs0}×100・・・(1) In the formula (1), Gs0 is the 20-degree specular gloss of the gravure plate surface 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 in accordance with JIS Z 8741.

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

3. The intaglio plate according to claim 1, wherein The gravure ink is water-based ink.

4. The intaglio plate according to claim 1, wherein The value (D1-D0) obtained by subtracting the reflection density D0 from the reflection density D1 is 0.35 or less, The reflection density D1 is measured according to JIS B 9620-1 by stacking 32 films of 2 cm×2 cm on the non-image portion of the printed strip-shaped printed substrate in the printed area of ​​the printed strip-shaped printed substrate printed with non-white aqueous ink. The reflection density D0 is measured in accordance with JIS B 9620-1 by stacking 32 sheets of 2 cm×2 cm films of unprinted strip-shaped printed substrates.

5. The intaglio plate according to claim 3, wherein The aqueous ink is an aqueous ink that does not contain ethanol, The contact angle of the plate surface of the intaglio plate with the aqueous ink not containing ethanol is 30 degrees or more.

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

7. A method for manufacturing an intaglio plate, for manufacturing the intaglio plate according to any one of claims 1 to 6, wherein: The method for manufacturing the gravure plate comprises: A step of preparing a gravure cylinder body having an image portion and a non-image portion formed on the surface; and The step of coating the image area and the non-image area with DLC-Si.

8. A method for producing a gravure printed article, comprising printing a strip-shaped printed substrate using the gravure plate according to any one of claims 1 to 6, wherein: The glossiness change rate Gs of the gravure plate surface before and after printing is calculated by the following formula (1): ∆ (%) is less than 3%, Gloss change rate Gs ∆ ={(Gs0-Gs1) / Gs0}×100・・・(1) In the formula (1), Gs0 is the 20-degree specular gloss of the gravure plate surface 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 in accordance with JIS Z 8741.

9. The method for producing a gravure printed article according to claim 8, wherein: The value (D1-D0) obtained by subtracting the reflection density D0 from the reflection density D1 is 0.35 or less, The reflection density D1 is measured according to JIS B 9620-1 by stacking 32 films of 2 cm×2 cm on the non-image portion of the printed strip-shaped printed substrate in the printed area of ​​the printed strip-shaped printed substrate printed with non-white aqueous ink. The reflection density D0 is measured in accordance with JIS B 9620-1 by stacking 32 sheets of 2 cm×2 cm films of unprinted strip-shaped printed substrates.

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