阅读说明：本技术 提高凹版使用寿命的电镀新工艺 (Novel electroplating process for prolonging service life of gravure ) 是由 *** 于 2019-11-28 设计创作，主要内容包括：本发明公开了凹版电镀技术领域的提高凹版使用寿命的电镀新工艺,包括以下步骤：步骤一：对待镀版辊表面依次进行打磨、清洗以及除油处理；步骤二：在版辊的表面进行瓦特镀镍打底；步骤三：在步骤二的镍层表面电镀一层铜层；步骤四：对铜层进行研磨抛光；步骤五：在铜层上电子雕刻；步骤六：采用氨基磺酸镍电镀液在铜层的表面镀镍；步骤七：在步骤六的镍层表面电镀铬层；步骤八：对铬层进行研磨抛光；步骤九：产品检测,本发明在镀铬之前加镀5-6分钟的氨基磺酸镍,在镀铜层形成1-1.5um的镀镍层,有效减缓了版辊的腐蚀进度,将版辊的耐腐蚀性提高一倍,较大幅度提高了凹版的使用寿命,具有很高的实用价值。(The invention discloses a novel electroplating process for prolonging the service life of an intaglio plate, which belongs to the technical field of intaglio plate electroplating and comprises the following steps: the method comprises the following steps: sequentially polishing, cleaning and deoiling the surface of the printing roller to be plated; step two: performing watt nickel plating priming on the surface of the plate roller; step three: electroplating a copper layer on the surface of the nickel layer in the second step; step four: grinding and polishing the copper layer; step five: electronic engraving on the copper layer; step six: plating nickel on the surface of the copper layer by adopting nickel sulfamate electroplating solution; step seven: electroplating a chromium layer on the surface of the nickel layer in the sixth step; step eight: grinding and polishing the chromium layer; step nine: product detection shows that nickel sulfamate is plated for 5-6 minutes before chromium plating, a nickel plating layer of 1-1.5 microns is formed on a copper plating layer, the corrosion progress of a printing roller is effectively slowed down, the corrosion resistance of the printing roller is doubled, the service life of a gravure plate is greatly prolonged, and the method has high practical value.)

1. The novel electroplating process for prolonging the service life of the gravure is characterized by comprising the following steps of:

the method comprises the following steps: sequentially polishing, cleaning and deoiling the surface of the printing roller to be plated;

step two: performing watt nickel plating priming on the surface of the plate roller;

step three: electroplating a copper layer on the surface of the nickel layer in the second step;

step four: grinding and polishing the copper layer;

step five: electronic engraving on the copper layer;

step six: plating nickel on the surface of the copper layer by adopting nickel sulfamate electroplating solution;

step seven: electroplating a chromium layer on the surface of the nickel layer in the sixth step;

step eight: grinding and polishing the chromium layer;

step nine: and (5) product detection.

2. The new electroplating process for prolonging the service life of the intaglio plate according to the claim 1, wherein the composition and the process parameters of the electroplating solution in the step six nickel plating are as follows:

nickel sulfamate: 280-300 g/L;

nickel chloride: 10-15 g/L;

boric acid: 40-45 g/L;

pH value: 3.5-4.5;

the immersion mode is as follows: 50-100%;

coating thickness: 1.0-1.5 um;

current density: 3-4A/dm²；

Temperature: 40-45 ℃;

groove coefficient: 1.17;

plate roller rotating speed and linear speed: 0.5-1.0 m/s;

area ratio of cathode to anode: 1: 1.5-2;

cathode-anode distance: 80-150 mm.

3. The new electroplating process for prolonging the service life of the intaglio plate according to the claim 2, wherein the composition and the process parameters of the electroplating solution in the step six nickel plating are as follows:

nickel sulfamate: 280-290 g/L;

nickel chloride: 12-15 g/L;

boric acid: 42-45 g/L;

pH value: 4-4.5;

the immersion mode is as follows: 70-100%;

coating thickness: 1.0-1.3 um;

current density: 3.5-4A/dm²；

Temperature: 42-45 ℃;

groove coefficient: 1.17;

the linear speed of the plate roller is 0.8-1.0 m/s;

area ratio of cathode to anode: 1: 1.7-2;

cathode-anode distance: 100-.

4. The new electroplating process for prolonging the service life of the intaglio plate according to the claim 3, wherein the composition and the process parameters of the electroplating solution in the step six nickel plating are as follows:

nickel sulfamate: 290 g/L;

nickel chloride: 15 g/L;

boric acid: 45 g/L;

pH value: 4;

the immersion mode is as follows: 80 percent;

coating thickness: 1.2 um;

current density: 4A/dm²；

Temperature: 45 ℃;

groove coefficient: 1.17;

plate roller rotating speed and linear speed: 1.0 m/s;

area ratio of cathode to anode: 1: 2;

cathode-anode distance: 120 mm.

5. The novel electroplating process for prolonging the service life of the intaglio plate according to any one of claims 2 to 4, wherein: and the anode for nickel plating in the sixth step is a nickel cake or a nickel plate.

6. The new electroplating process for prolonging the service life of the intaglio plate according to claim 5, characterized in that: preheating time in the nickel plating process of the sixth step: 5-10S.

7. The new electroplating process for prolonging the service life of the intaglio plate according to claim 6, characterized in that: the electroplating time in the nickel plating process of the sixth step is as follows: 300-.

8. The new electroplating process for prolonging the service life of the intaglio plate according to claim 7, characterized in that: the electroplating solution for the nickel plating in the sixth step also contains at least one of iron ions and copper ions, and the concentration of both the iron ions and the copper ions is below 50 ppm.

Technical Field

The invention relates to the technical field of gravure electroplating, in particular to a novel electroplating process for prolonging the service life of a gravure plate.

Background

The electronic engraving plate making refers to a process of converting optical signals or digital signals into mechanical motion of an engraving knife through photoelectric conversion and electromagnetic conversion. When the electronic engraving machine is used for engraving, a frequency generator is used for generating oscillation with certain frequency and proper amplitude, the oscillation frequency determines the number of engraved mesh holes per second, a digital signal transmitted by an image memory is converted into an analog signal through a digital-to-analog converter, and the analog signal is combined with the former amplitude to control an engraving knife to engrave mesh holes with different sizes and depths on the surface of a plate making copper layer of a plate roller rotating at a constant speed.

Gravure printing is a small branch of the printing industry, gravure electroplating is a smaller branch of the electroplating industry, and electroplating technology and cost occupy a very small proportion in the gravure production flow. In the traditional plate making process, a chromium layer is directly electroplated on a copper layer, and the thickness of the chromium layer is 8-12 um. The indexes for measuring the service life of the plate roller include the printing quantity of the plate roller and the storage time of the plate roller, wherein the printing quantity of the plate roller depends on the hardness and the wear resistance of the chromium layer, and the corrosion resistance of the plate roller mainly depends on the corrosion resistance and the porosity of the chromium layer. According to practical application, the hardness of the chromium layer needs to be improved if the printing quantity of the chromium layer is improved, but the higher the hardness of the chromium layer is, the higher the porosity of the chromium layer is, and meanwhile, the larger the internal stress is, the deterioration of the anticorrosion capability of the chromium layer per se can be worsened, so that the quality requirements of the two aspects are hardly considered, the chromium layer of 8-12um is the upper limit of the chromium plating thickness, the thickening of the chromium layer can influence the ink transfer and the color reduction, the storage time of the traditional gravure is short, and therefore, a gravure electroplating process is needed to prolong the service life of the gravure.

Based on the technical scheme, the invention designs a novel electroplating process for prolonging the service life of the gravure so as to solve the problems.

Disclosure of Invention

The invention aims to provide a novel electroplating process for prolonging the service life of an intaglio plate, so as to solve the problem of short storage time of the traditional intaglio plate in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

the novel electroplating process for prolonging the service life of the gravure comprises the following steps:

the method comprises the following steps: sequentially polishing, cleaning and deoiling the surface of the printing roller to be plated;

step two: performing watt nickel plating priming on the surface of the plate roller;

step three: electroplating a copper layer on the surface of the nickel layer in the second step;

step four: grinding and polishing the copper layer;

step five: electronic engraving on the copper layer;

step six: plating nickel on the surface of the copper layer by adopting nickel sulfamate electroplating solution;

step seven: electroplating a chromium layer on the surface of the nickel layer in the sixth step;

step eight: grinding and polishing the chromium layer;

step nine: and (5) product detection.

The new electroplating process for prolonging the service life of the gravure plate further comprises the following steps of:

nickel sulfamate: 280-300 g/L;

nickel chloride: 10-15 g/L;

boric acid: 40-45 g/L;

pH value: 3.5-4.5;

the immersion mode is as follows: 50-100%;

coating thickness: 1.0-1.5 um;

current density: 3-4A/dm²；

Temperature: 40-45 ℃;

groove coefficient: 1.17;

plate roller rotating speed and linear speed: 0.5-1.0 m/s;

area ratio of cathode to anode: 1: 1.5-2;

cathode-anode distance: 80-150 mm.

The new electroplating process for prolonging the service life of the gravure plate further comprises the following steps of:

nickel sulfamate: 280-290 g/L;

nickel chloride: 12-15 g/L;

boric acid: 42-45 g/L;

pH value: 4-4.5;

the immersion mode is as follows: 70-100%;

coating thickness: 1.0-1.3 um;

current density: 3.5-4A/dm²；

Temperature: 42-45 ℃;

groove coefficient: 1.17;

the linear speed of the plate roller is 0.8-1.0 m/s;

area ratio of cathode to anode: 1: 1.7-2;

cathode-anode distance: 100-.

The new electroplating process for prolonging the service life of the gravure plate further comprises the following steps of:

nickel sulfamate: 290 g/L;

nickel chloride: 15 g/L;

boric acid: 45 g/L;

pH value: 4;

the immersion mode is as follows: 80 percent;

coating thickness: 1.2 um;

current density: 4A/dm²；

Temperature: 45 ℃;

groove coefficient: 1.17;

plate roller rotating speed and linear speed: 1.0 m/s;

area ratio of cathode to anode: 1: 2;

cathode-anode distance: 120 mm.

According to the novel electroplating process for prolonging the service life of the gravure, the anode of nickel plating in the sixth step is a nickel cake or a nickel plate.

The new electroplating process for prolonging the service life of the gravure further comprises the following steps: 5-10S.

The novel electroplating process for prolonging the service life of the gravure plate further comprises the following steps: 300-.

In the new electroplating process for improving the service life of the gravure, the electroplating solution of the nickel plating in the step six also contains at least one of iron ions and copper ions, and the concentration of the iron ions and the concentration of the copper ions are both below 50 ppm.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, nickel sulfamic acid is plated for 5-6 minutes before chromium plating, a nickel plating layer of 1-1.5 microns is formed on a copper plating layer, the nickel plating layer is fine in crystallization, high in plating stability and good in corrosion resistance, and a tiny corrosion primary battery is formed by combination of electrode potential differences of multiple plating layers of the copper plating layer, the nickel plating layer and the chromium plating layer to generate tiny corrosion current, so that the corrosion progress of the plate roller is effectively slowed down, the corrosion resistance of the plate roller is doubled, the service life of the gravure is greatly prolonged, and the method has high practical value.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.