CN103481638B - Printing roller for laser paper printing and manufacturing process thereof - Google Patents

Abstract

The present invention relates to the technical field of gravure printing plate rollers, and specifically to a plate roller for laser paper printing and a manufacturing process thereof. The manufacturing process of the present invention includes copper plating, glue coating, laser engraving, corrosion, degumming and chrome plating steps. The plate roller of the present invention includes a roller body, a non-printing area and a printing area are arranged on the outer surface of the roller body, a copper plating layer is fixedly connected to the surface of the non-printing area, a laser engraving layer is provided on the surface of the printing area, and a chrome plating layer is fixedly connected to the surface of the copper plating layer and the laser engraving layer. The laser engraving layer includes a first engraving layer and a second engraving layer, and the number of engraving mesh lines and the engraving mesh angle of the first engraving layer are different from the number of engraving mesh lines and the engraving mesh angle of the second engraving layer. The present invention can dislocate the fault position after gravure printing by adopting a manufacturing process of two engravings, so as to achieve a natural and gentle printing layer. The manufacturing process of the present invention is simple, easy to control, and has high production efficiency.

Description

A version roller for laser paper printing and its manufacturing process

technical field

The invention relates to the technical field of gravure plate rolls, in particular to a plate roll for laser paper printing and a manufacturing process thereof.

Background technique

At present, the development of the outer packaging of consumer goods such as cigarette boxes and wine boxes in China is changing with each passing day. The outer packaging materials such as ordinary white cardboard and coated paper have been gradually eliminated. Now more and more medium-sized consumer goods have adopted light silver paper for outer packaging. , laser paper and other high-level new materials, but the surface of these high-level materials is not easy to ink due to the transfer or compounding of the surface, especially when the layered plate has ugly faults during gravure printing, customers have to use offset printing, but offset printing It has the disadvantages of high cost and low efficiency, which seriously affects the economic benefits of customers. Therefore, there is an urgent need in the market for a plate roller for laser paper printing with high printing efficiency, low production cost, and no faults.

Contents of the invention

In order to overcome the shortcomings and deficiencies in the prior art, the object of the present invention is to provide a manufacturing process for a master roll for laser paper printing, which has simple steps, convenient control and high production efficiency.

Another object of the present invention is to provide a plate roller for laser paper printing with high printing efficiency, low production cost and no breakage.

The object of the present invention is achieved through the following technical solutions: a manufacturing process for a plate roller for laser paper printing, comprising the steps of:

A. Copper plating: Put the roller body into the electroplating tank with copper plating solution for electroplating, the current density is 16~18ASF, the electroplating temperature is 30~50℃, the electroplating time is 30~60min, and the Vickers hardness is 180~ 210, the thickness of the plated copper layer is 10~14um;

B. Gluing: hang the copper-plated roller body, and evenly coat a layer of 0.05~0.25mm glue solution on the outside of the roller body, and let it dry naturally for 30~40min after coating;

C. Laser engraving: Put the rubber-coated and dried roller body into the laser engraving machine, set the number of engraving mesh lines and engraving mesh angle, and carry out laser engraving according to the designed pattern. The depth of laser engraving is 60~150mm; Engraving includes the first laser engraving and the second laser engraving. The number of engraving screen lines and engraving screen angles of the first engraving are different from those of the second engraving.

D. Corrosion: Put the engraved roller body into a spray drum corrosion machine to corrode the visible copper layer on the roller body. The corrosion solution is ferric chloride solution with a Baume degree of 34~38, and the corrosion temperature The temperature is 20~40℃, and the corrosion time is 5~20s;

E. Degumming: Use industrial alcohol to degumming the corroded roller body;

F. Chromium plating: Put the degummed roller body into an electroplating bath filled with chrome plating solution for electroplating. The current density is 28~32ASF, the electroplating temperature is 50~60°C, the electroplating time is 5~30min, and the Vickers hardness is 800. ~900, the thickness of the copper-chromium layer is 4~6um.

The roll body used in the present invention is a roll body made of seamless steel pipe. Seamless steel pipe is a round, square or rectangular steel material with a hollow cross-section and no joints around it. Seamless steel pipes are made of steel ingots or solid tube blanks that are perforated into capillary tubes, and then made by hot rolling, cold rolling or cold drawing. The seamless steel pipe has a hollow section and is widely used as a pipe for conveying fluid. Compared with solid steel such as round steel, the steel pipe is lighter in weight when the bending and torsional strength is the same. It is an economical cross-section steel and is widely used in the manufacture of structures. components and mechanical parts, such as oil drill pipes, automobile drive shafts, bicycle frames, and steel scaffolding used in building construction.

The roller body must be copper-plated first, and the copper-plated layer is the working surface of laser engraving, so its quality must meet the following requirements: high purity copper, fine grain; the surface of the coating should be smooth without depressions, no streaks, etc.; Sufficient hardness and toughness. After the copper layer is plated, it needs to be cut by a turning-grinding machine or polished by a grinding machine, grinding and polishing machine, so that the diameter tolerance, parallelism tolerance and surface finish of the plate roller can meet the requirements.

Preferably, in the step A, the copper plating solution is composed of the following raw materials: copper sulfate 5-20g/L, disodium edetate 10-30g/L, potassium sodium tartrate 5-20g/L, formaldehyde 2~ 5g/L, sodium hydroxide 10~15g/L, methanol 0.001~0.1g/L and sodium silicate 0.1~2g/L; the pH value of the copper plating solution is 12~13; the anode material for electroplating is a phosphorus content of 2 ‰~5‰ copper plate.

The copper plating solution is mainly composed of copper salt, reducing agent, complexing agent, stabilizer, pH regulator and other additives.

The main function of copper salt is to provide copper ions, and the content of copper salt in the copper plating solution has a certain influence on the deposition rate. When the pH value of the solution is controlled within the technological range, increasing the copper content in the solution increases the deposition rate, but the tendency of the solution to decompose naturally also increases. In the solution without stabilizer, it is advisable to use a low concentration plating solution; in the solution containing stabilizer, the concentration of copper ions can be appropriately higher. The concentration of copper salt has little effect on the performance of the coating, but the impurities in the copper salt may have a great impact on the coating, so the electroless copper plating solution generally requires higher purity of copper salt. Considering cost reduction, the copper salt used in the present invention is copper sulfate, and its purity is analytically pure.

The electroless copper plating solution using formaldehyde as a reducing agent is alkaline. In order to prevent copper ions from forming hydroxides and precipitate out, a complexing agent must be added to the plating solution to make the copper ions become complex ions. The complexing agent has a great influence on the electroless copper plating solution and the performance of the plating layer. Two or more complexing agents are usually added to the modern electroless copper plating solution. The present invention adopts edetate disodium as the main complexing agent, potassium sodium tartrate as the auxiliary complexing agent, because the ability of edetate disodium to stabilize the plating solution is stronger than potassium sodium tartrate, but potassium sodium tartrate plating solution The appearance of the coating obtained in the method is better than that of disodium ethylenediaminetetraacetic acid plating solution. The combination of the two complexing agents can improve the stability of the plating solution, and can improve the plating speed and the quality of the coating.

A reducing agent must be added to the copper plating solution, and the reducing ability of formaldehyde increases with the increase of the alkalinity of the plating solution. Usually, the copper plating solution has the ability to reduce copper only when the pH value is greater than 11. The higher the pH value of the plating solution, the stronger the reducing ability of formaldehyde and the faster the plating speed. But if the pH value of the plating solution is too high, it will easily cause the spontaneous decomposition of the plating solution and reduce the stability of the plating solution. Therefore, the pH value of most copper plating solutions is controlled at about 12, and the pH value of the copper plating solution of the present invention is 12~ 13. Using formaldehyde as a reducing agent.

Since the process of electroless copper plating is a process in which the pH value of the plating solution decreases, a pH value regulator must be added to the plating solution to maintain the pH value of the plating solution within the normal range. The pH value regulator used in the present invention is hydrogen sodium oxide.

In the process of electroless copper plating, in addition to the effective oxidation-reduction reaction of copper ions on the catalytic surface, which is reduced to metallic copper by formaldehyde, there are many side reactions. The side reaction not only consumes the active ingredients in the copper plating solution, but also produces cuprous oxide suspended in the plating solution as a very fine powder, which is difficult to remove by filtration and easily causes the decomposition of the plating solution. If it is co-deposited with copper, it will get The copper deposition layer is loose and rough, and has poor bonding force with the substrate.

In view of the above problems, a stabilizer needs to be added in the copper plating solution to stabilize the plating solution and improve the quality of the coating. The present invention uses methanol as the stabilizer. Since most of the stabilizers are also catalytic poisoning agents for the electroless copper plating reaction, it is very important to control the amount of stabilizers when using them. Otherwise, when the amount is too large, the plating speed will be significantly reduced or even the electroplating will stop.

Additives that can increase the copper deposition rate under the premise of stabilizing the plating solution are called accelerators or accelerators. In order to reduce the surface tension of the electroless copper plating solution and improve the quality of the coating, some surfactants are sometimes added to the electroless copper plating solution. The invention uses sodium silicate as an additive, which can effectively absorb impurities harmful to copper plating in the plating solution and a small amount of copper powder formed by side reactions, and can make the copper powder gather together through coagulation, and can be quickly filtered through filtration. Filtering out can improve the stability of the electroless copper plating process on production.

Preferably, the step B is specifically as follows: hang the copper-plated roller body, place a circular film on the outside of the roller body, the circular film is connected with a box containing glue, and the Driven, the circular film moves vertically downward along the roller body at a constant speed, and evenly coats a layer of 0.05~0.25mm glue solution on the outside of the roller body, and then dries naturally for 30~40 minutes after the coating is completed. The glue solution is photosensitive glue for laser engraving.

Preferably, in said step C, the design of pattern comprises the following steps:

(1) Scanning: Select the wood grain, use a high-definition lens with a focal length of 120mm, and an input resolution of 1800~2000dpi to scan the wood grain, and the distance between the lens and the scanning platform is 45~55cm;

(2) Processing: adjust the scanned image to a resolution of 800~1000dpi, and perform color separation, color correction, and version revision processing on the scanned image; reduce the resolution to 304.8dpi to obtain a designed pattern.

The image processing of the present invention adopts GMG color software, and through the application of GMG software in wood grain, it can well reflect the wood grain effect of various spot colors, and better reflect the texture of solid wood, thereby solving the problem of customers seeking quality. All kinds of waste after multiple repairs required. Before printing, it can well restore solid wood graphics, effectively control product quality, and the proofing effect can directly reach the printing level.

Preferably, in the step C, the parameters of the laser engraving are as follows: the motor power is 30-50W, the rotation speed of the roller body is 700-900r/min, the engraving time is 1-3h, and the focal length is 20-24mm.

Preferably, in the step C, the number of engraved mesh lines for the first laser engraving is 60-80, the engraved mesh angle is 40°, the engraved mesh lines number for the first laser engraving is 85-105, and the engraved mesh angle is 37° .

More preferably, when the engraving line number of the first laser engraving is 80 lines and the engraving screen angle is 37°, the engraving line number of the second laser engraving is 105 lines and the engraving screen angle is 40°; when the first When the engraving line number of the first laser engraving is 70 lines and the engraving screen angle is 37°, the engraving line number of the second laser engraving is 100 lines and the engraving screen angle is 40°; when the engraving line number of the first laser engraving is When 60 lines and engraving screen angle are 37°, the number of engraving screen lines for the second laser engraving is 86 lines and engraving screen angle is 40°.

Preferably, in the step C, the cross-section of the cells formed after laser engraving is in the shape of "凵".

The cross-section of the cells formed after traditional laser engraving is "V"-shaped, but the amount of ink in the "V"-shaped cells is small, and there are ugly faults in the layered plate during gravure printing. The present invention adopts "凵" Font type mesh, large amount of ink, can solve the problem of faults in gravure printing. More preferably, the cross-section of the cells formed after laser engraving is in an inverted "convex" shape. The inverted "convex" shape design makes the top angle of the ink more smooth due to the tension during gravure printing, and the amount of ink Large, high production efficiency and low cost.

Due to the poor hardness of the copper plating layer, it is easy to be scratched by the scraper during printing, so a layer of hard chromium layer should be plated on the surface of the copper plating layer. Chrome plating needs to go through the following steps: cleaning, degreasing, chrome plating, polishing. The purpose of cleaning and degreasing is to remove the grease and dirt on the layout, and the purpose of polishing is to polish off the burrs on the edge of the mesh cell during the chrome plating process. The chrome-plated layer on the surface of the gravure plate roller has high hardness, high wear resistance and chemical stability. It is a necessary procedure to make the printing plate roller to prevent the copper layer on the surface of the printing plate from being damaged by chrome plating, and to improve the printing plate The printing resistance of the plate is mainly to improve the hardness of the chrome layer.

Preferably, in the step F, the chromium plating solution includes the following raw materials in parts by weight: 180 to 220 parts of chromic anhydride, 1 to 5 parts of sodium fluoride, 2 to 6 parts of potassium bromate, 1.8 to 2.2 parts of sulfuric acid and 2 to 2 parts of CF-202 5 parts; the weight ratio of chromic anhydride to sulfuric acid is 100:1~1.3; the pH value of the chromium plating solution is 1~2; the anode material for electroplating is tin content 20%~50%, silver content 0.5%~1.5% Lead tin silver alloy.

The amount of chromic anhydride has a great influence on the hardness of the chromium plating layer. When the other process conditions are the same, the hardness is high when the concentration of chromic anhydride is low; but when the concentration of chromic anhydride is low, the chromium plating solution changes rapidly and is unstable.

In normal chromium plating process specifications, the weight ratio of chromic anhydride to sulfuric acid should be kept at 100:1. The weight ratio of chromic anhydride to sulfuric acid used in the present invention is 100:1~1.3. When other concentrations remain unchanged, increase the sulfuric acid content , the hardness of the chromium layer also increases correspondingly; but when the ratio of the two is 100:1.4, the hardness value will decrease again when the sulfuric acid content is increased.

  CF-202 is a rare earth chrome plating additive. In the metal surface treatment process, it can optimize the process, improve the quality, and reduce the overall cost. The effect is very obvious, and it has won the recognition and favor of the majority of users. It also has the function of removing impurities, reducing chrome plating failures, stable low chrome chrome plating, and excellent deep plating ability.

At normal temperature, the hardness of the chromium layer increases with the increase of the current density, and the hardness tends to be stable when the current density reaches a certain limit.

At a higher temperature (50-60°C), the hardness of the chromium layer plated from a dilute solution is 15-20% higher than that of a concentrated plating solution; The hardness of the chromium layer plated from the dilute solution is not much different from that of the chromium layer plated from the concentrated solution.

Another object of the present invention is achieved through the following technical solutions: a plate roller for laser paper printing, comprising a roller body, a non-printing area and a printing area are arranged on the outer surface of the roller body, and a copper-plated layer is fixedly connected to the surface of the non-printing area , the surface of the printing area is provided with a laser engraving layer, and the surface of the copper plating layer and the laser engraving layer are fixedly connected with a chrome plating layer. The number of engraving mesh lines and the engraving mesh angle of the angle and the second engraving layer are different.

Preferably, the thicknesses of the copper plating layer, the laser engraving layer and the chrome plating layer are 10-14um, 100-150um and 4-6um in sequence.

The beneficial effects of the present invention are that: the manufacturing process of the present invention includes the steps of copper plating, encapsulation, laser engraving, corrosion, degumming and chrome plating, wherein the laser engraving includes the first laser engraving and the second laser engraving, and the first engraving The engraving screen line number and engraving screen angle are different from the engraving screen line number and engraving screen angle of the second engraving. By using the two-time engraving process, the position of the fault after the gravure printing can be dislocated, so as to achieve a natural and gentle printing level. The invention has the advantages of simple manufacturing process, convenient control and high production efficiency.

The engraved line number and engraved screen angle of the first engraved layer of the version roller of the present invention are all different from the engraved screen lines and engraved screen angle of the second engraved layer, which can solve the fault problem during layered plate printing by means of gravure printing. Through overlapping printing of the first engraving layer and the second engraving layer, the position of the fault is dislocated, so that the printing layer is naturally smooth, the printing efficiency is high, and the production cost is low. The plate roller used for laser paper printing of the present invention has high printing efficiency, low production cost and no faults.

Description of drawings:

Fig. 1 is a structural schematic diagram of the plate roller of the present invention.

Fig. 2 is a partial cross-sectional view of the plate roll of the present invention.

Fig. 3 is a top view of the first laser engraving layer and the second laser engraving layer of the present invention.

The reference signs are:

1——roll body

2 - non-printing area

3 - printing area

4——Copper plating layer

5—Laser engraving layer

51——The first laser engraving layer

52——Second laser engraving layer

6—Chrome layer.

Detailed ways:

In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the examples, and the contents mentioned in the embodiments are not intended to limit the present invention.

Example 1

A manufacturing process for a plate roller for laser paper printing, comprising the following steps:

A. Copper plating: put the roller body 1 into an electroplating bath equipped with a copper plating solution for electroplating, the current density is 16ASF, the electroplating temperature is 30°C, the electroplating time is 30min, the Vickers hardness is 180, and the copper layer is plated The thickness is 10um; in the step A, the copper plating solution is composed of the following raw materials: copper sulfate 5g/L, disodium edetate 10g/L, potassium sodium tartrate 5g/L, formaldehyde 2g/L, sodium hydroxide 10g/L, methanol 0.001g/L and sodium silicate 0.1g/L; the pH value of the copper plating solution is 12; the anode material for electroplating is a copper plate with a phosphorus content of 2‰;

B. Glue wrapping: hang the copper-plated roller body 1, and set a circular film on the outside of the roller body 1. The circular film is connected with a box containing glue. Driven by the power of the motor at 10Hz, the circular film The film moves vertically downward along the roller body 1 at a constant speed, and evenly coats a layer of 0.05mm glue solution on the outside of the roller body 1, and dries naturally for 30 minutes after the coating is completed;

C. Laser engraving: put the roller body 1 after the rubber coating has dried into the laser engraving machine, set the number of engraving screen lines and engraving screen angle, and carry out laser engraving according to the designed pattern. The depth of laser engraving is 60mm; In step C, the design of pattern comprises the following steps:

(1) Scanning: Select the wood grain, use a high-definition lens with a focal length of 120mm, and an input resolution of 1800dpi to scan the wood grain, and the distance between the lens and the scanning platform is 45cm;

(2) Processing: Adjust the resolution of the scanned image to 800dpi, and perform color separation, color correction, and revision processing on the scanned image; reduce the resolution to 304.8dpi to obtain the designed pattern.

In the step C, the parameters of the laser engraving are: the motor power is 30W, the rotation speed of the roller body 1 is 700r/min, the engraving time is 1h, and the focal length is 20mm;

In the described step C, the number of engraved screen lines of the first laser engraving is 80 lines, and the engraving screen angle is 37 °, and the number of engraving screen lines of the second laser engraving is 105 lines, and the engraving screen angle is 40 °;

In the step C, the cross section of the cell formed after laser engraving is in the shape of "凵";

D. Corrosion: put the engraved roller body 1 into a spray drum corrosion machine, and corrode the visible copper layer on the roller body 1. The corrosion solution is a ferric chloride solution with a Baume degree of 34, and the corrosion temperature is at 20°C, and the corrosion time is 5s;

E, degumming: use industrial alcohol to degumming the corroded roller body 1;

F, chrome plating 6: Put the degummed roller body 1 into the electroplating tank equipped with chrome plating solution 6 for electroplating, the current density is 28ASF, the electroplating temperature is 50°C, the electroplating time is 5min, and the Vickers hardness is 800. The thickness of copper chromium layer is 4um; In described step F, 6 liquids of chromium plating comprise the raw material of following weight portion: chromic anhydride 180 parts, sodium fluoride 1 part, potassium bromate 2 parts, sulfuric acid 1.8 parts and CF-202 2 parts; The weight ratio of acid anhydride to sulfuric acid is 100:1; the pH value of the chrome plating liquid 6 is 1; the anode material of electroplating is a lead-tin-silver alloy with a tin content of 20% and a silver content of 0.5%.

A version roller for laser paper printing, comprising a roller body 1, the surface of the roller body 1 is provided with a non-printing area 2 and a printing area 3, the surface of the non-printing area 32 is fixedly connected with a copper-plated layer 4, and the surface of the printing area 3 is provided with Laser engraving layer 5, copper plating layer 4 and laser engraving layer 5 surfaces are all fixedly connected with 6 layers of chrome plating, laser engraving layer 5 comprises first engraving layer 51 and second engraving layer 52, the engraving line number of first engraving layer 51, The engraved mesh angle is different from the engraved mesh line number and the engraved mesh angle of the second engraved layer 52 . The thicknesses of the copper plating layer 4, the laser engraving layer 5 and the chrome plating layer 6 are 10um, 100um and 4um in sequence.

Example 2

A manufacturing process for a plate roller for laser paper printing, comprising the following steps:

A. Copper plating: Put the roller body 1 into an electroplating tank equipped with a copper plating solution for electroplating. The current density is 17ASF, the electroplating temperature is 40°C, the electroplating time is 45min, and the Vickers hardness is 195. The copper layer is plated. Thickness is 12um; In described step A, copper plating liquid is made up of following raw material: copper sulfate 12g/L, disodium edetate 20g/L, potassium sodium tartrate 12g/L, formaldehyde 3.5g/L, hydroxide Sodium 12.5g/L, methanol 0.05g/L and sodium silicate 1g/L; the pH value of the copper plating solution is 12.5; the anode material for electroplating is a copper plate with a phosphorus content of 3‰;

B. Glue coating: hang the copper-plated roller body 1, and set a circular film on the outside of the roller body 1. The circular film is connected with a box containing glue. Driven by the power of the motor at 15Hz, the circular film The film moves vertically downward along the roller body 1 at a constant speed, and evenly coats a layer of 0.15mm glue solution on the outside of the roller body 1, and dries naturally for 35 minutes after the coating is completed;

C. Laser engraving: Put the dried roll body 1 into the laser engraving machine, set the number of engraving mesh lines and the engraving mesh angle, and carry out laser engraving according to the designed pattern. The depth of laser engraving is 120mm; In step C, the design of pattern comprises the following steps:

(1) Scanning: Select the wood grain, use a high-definition lens with a focal length of 120mm, and an input resolution of 1900dpi to scan the wood grain, and the distance between the lens and the scanning platform is 50cm;

(2) Processing: Adjust the resolution of the scanned image to 900dpi, and perform color separation, color correction, and version revision processing on the scanned image; reduce the resolution to 304.8dpi to obtain the designed pattern.

In the step C, the parameters of the laser engraving are: the motor power is 40W, the rotation speed of the roller body 1 is 800r/min, the engraving time is 2h, and the focal length is 22 mm;

In the step C, the engraving line number of the first laser engraving is 70 lines, the engraving screen angle is 37 °, the engraving line number of the second laser engraving is 100 lines, and the engraving screen angle is 40 °;

In the step C, the cross section of the cell formed after laser engraving is in the shape of "凵";

D. Corrosion: put the engraved roller body 1 into the spray drum corrosion machine, and corrode the visible copper layer on the roller body 1. The corrosion solution is a ferric chloride solution with a Baume degree of 36, and the corrosion temperature is The temperature is 30℃, and the corrosion time is 12s;

E, degumming: use industrial alcohol to degumming the corroded roller body 1;

F. Chromium plating 6: Put the degummed roller body 1 into an electroplating tank equipped with chrome plating solution 6 for electroplating. The current density is 30ASF, the electroplating temperature is 55°C, the electroplating time is 15min, and the Vickers hardness is 850. The thickness of copper chromium layer is 5um; In described step F, 6 liquids of chrome plating comprise the raw material of following weight portion: 200 parts of chromic anhydride, 2.5 parts of sodium fluoride, 4 parts of potassium bromate, 2.2 parts of sulfuric acid and 3 parts of CF-202; The weight ratio of acid anhydride to sulfuric acid is 100:1.1; the pH value of the chromium plating liquid 6 is 1.5; the anode material of electroplating is a lead-tin-silver alloy with a tin content of 35% and a silver content of 1%.

A version roller for laser paper printing, comprising a roller body 1, the surface of the roller body 1 is provided with a non-printing area 32 and a printing area 3, the surface of the non-printing area 32 is fixedly connected with a copper-plated layer 4, and the surface of the printing area 3 is provided with Laser engraving layer 5, copper plating layer 4 and laser engraving layer 5 surfaces are all fixedly connected with 6 layers of chrome plating, laser engraving layer 5 comprises first engraving layer 51 and second engraving layer 52, the engraving line number of first engraving layer 51, The engraved mesh angle is different from the engraved mesh line number and the engraved mesh angle of the second engraved layer 52 . The thicknesses of the copper plating layer 4, the laser engraving layer 5 and the chrome plating layer 6 are 12um, 120um and 5um in sequence.

Example 3

A manufacturing process for a plate roller for laser paper printing, comprising the following steps:

A. Copper plating: put the roller body 1 into an electroplating tank equipped with a copper plating solution for electroplating, the current density is 18ASF, the electroplating temperature is 50°C, the electroplating time is 60min, the Vickers hardness is 210, and the copper layer is plated The thickness is 14um; in the step A, the copper plating solution is composed of the following raw materials: copper sulfate 20g/L, disodium edetate 30g/L, potassium sodium tartrate 20g/L, formaldehyde 5g/L, sodium hydroxide 15g/L, methanol 0.1g/L and sodium silicate 2g/L; the pH value of the copper plating solution is 13; the anode material for electroplating is a copper plate with a phosphorus content of 5‰;

B. Gluing: hang the copper-plated roller body 1, and set a circular film on the outside of the roller body 1. The circular film is connected with a box containing glue. Driven by the power of the motor at 20Hz, the circular film The film moves vertically downward along the roller body 1 at a constant speed, and evenly coats a layer of 0.25mm glue solution on the outside of the roller body 1, and dries naturally for 40 minutes after the coating is completed;

C. Laser engraving: Put the rubber-covered roller body 1 into the laser engraving machine, set the number of engraving mesh lines and engraving mesh angle, and carry out laser engraving according to the designed pattern. The depth of laser engraving is 150mm; In step C, the design of pattern comprises the following steps:

(1) Scanning: Select the wood grain, use a high-definition lens with a focal length of 120mm, and an input resolution of 2000dpi to scan the wood grain, and the distance between the lens and the scanning platform is 45~55cm;

(2) Processing: Adjust the resolution of the scanned image to 1000dpi, and perform color separation, color correction, and version revision processing on the scanned image; reduce the resolution to 304.8dpi to obtain the designed pattern.

In the step C, the parameters of the laser engraving are: the motor power is 50W, the rotation speed of the roller body 1 is 900r/min, the engraving time is 3h, and the focal length is 24mm;

In the step C, the engraving line number of the first laser engraving is 60 lines, the engraving screen angle is 37 °, the engraving line number of the second laser engraving is 86 lines, and the engraving screen angle is 40 °;

In the step C, the cross section of the cell formed after laser engraving is in the shape of "凵";

D. Corrosion: put the engraved roller body 1 into a spray drum corrosion machine, and corrode the visible copper layer on the roller body 1. The corrosion solution is a ferric chloride solution with a Baume degree of 38, and the corrosion temperature is 40℃, corrosion time is 20s;

E, degumming: use industrial alcohol to degumming the corroded roller body 1;

F, chrome plating 6: put the degummed roller body 1 into the electroplating tank equipped with chrome plating solution 6 for electroplating, the current density is 32ASF, the electroplating temperature is 60°C, the electroplating time is 30min, and the Vickers hardness is 900. The thickness of the copper chrome layer is 14um. In described step F, 6 parts of chrome-plating liquids comprise the raw material of following weight portion: chromic anhydride 180 parts, sodium fluoride 5 parts, potassium bromate 6 parts, sulfuric acid 2.2 parts and CF-202 5 parts; The weight ratio of chromic anhydride and sulfuric acid is 100 : 1.2; the pH value of the chrome-plating solution 6 is 2; the anode material of the electroplating is a lead-tin-silver alloy with a tin content of 50% and a silver content of 1.5%.

A version roller for laser paper printing, comprising a roller body 1, the surface of the roller body 1 is provided with a non-printing area 32 and a printing area 3, the surface of the non-printing area 32 is fixedly connected with a copper-plated layer 4, and the surface of the printing area 3 is provided with Laser engraving layer 5, copper plating layer 4 and laser engraving layer 5 surfaces are all fixedly connected with 6 layers of chrome plating, laser engraving layer 5 comprises first engraving layer 51 and second engraving layer 52, the engraving line number of first engraving layer 51, The engraved mesh angle is different from the engraved mesh line number and the engraved mesh angle of the second engraved layer 52 . The thicknesses of the copper plating layer 4, the laser engraving layer 5 and the chrome plating layer 6 are 14um, 150um and 6um in sequence.

The above-mentioned embodiments are preferred implementation solutions of the present invention. In addition, the present invention can also be realized in other ways, and any obvious replacements are within the protection scope of the present invention without departing from the concept of the present invention.

Claims (6)

1. A manufacturing process for a plate roller for laser paper printing, characterized in that: comprising the steps: A. Copper plating: Put the roller body into the electroplating tank with copper plating solution for electroplating, the current density is 16~18ASF, the electroplating temperature is 30~50℃, the electroplating time is 30~60min, and the Vickers hardness is 180~ 210, the thickness of the plated copper layer is 10~14um; In the step A, the copper plating solution is composed of the following raw materials: copper sulfate 5-20g/L, disodium edetate 10-30g/L, potassium sodium tartrate 5-20g/L, formaldehyde 2-5g/L , sodium hydroxide 10~15g/L, methanol 0.001~0.1g/L and sodium silicate 0.1~2g/L; the pH value of the copper plating solution is 12~13; the anode material for electroplating has a phosphorus content of 2‰~5 ‰ copper plate; B. Gluing: hang the copper-plated roller body, and evenly coat a layer of 0.05~0.25mm glue solution on the outside of the roller body, and let it dry naturally for 30~40min after coating; C. Laser engraving: Put the rubber-coated and dried roller body into the laser engraving machine, set the number of engraving mesh lines and engraving mesh angle, and carry out laser engraving according to the designed pattern. The depth of laser engraving is 60~150mm; Engraving includes the first laser engraving and the second laser engraving. The number of engraving screen lines and engraving screen angles of the first engraving are different from those of the second engraving; In the step C, the engraving line number of the first laser engraving is 60-80, the engraving screen angle is 40°, the engraving line number of the second laser engraving is 85-105, and the engraving screen angle is 37 °; In the step C, the cross-section of the cells formed after laser engraving is in an inverted "convex" shape; D. Corrosion: Put the engraved roller body into a spray drum corrosion machine to corrode the visible copper layer on the roller body. The corrosion solution is a ferric chloride solution with a Baume degree of 34~36, and the corrosion temperature The temperature is 20~40℃, and the corrosion time is 5~20s; E. Degumming: Use industrial alcohol to degumming the corroded roller body; F. Chromium plating: Put the degummed roller body into an electroplating tank filled with chrome plating solution for electroplating. The current density is 28~32ASF, the electroplating temperature is 50~55°C, the electroplating time is 5~15min, and the Vickers hardness is 800. ~900, the thickness of the chromium layer is 4~6um; In the step F, the chromium plating solution includes the following raw materials in parts by weight: 180 to 220 parts of chromic anhydride, 1 to 5 parts of sodium fluoride, 2 to 6 parts of potassium bromate, 1.8 to 2.2 parts of sulfuric acid and 2 to 5 parts of CF-202; The weight ratio of chromic anhydride to sulfuric acid is 100:1~1.3; the pH value of the chromium plating solution is 1~2; the anode material for electroplating is lead-tin-silver with a tin content of 20%~50% and a silver content of 0.5%~1.5%. alloy. 2. The manufacturing process of a forme roller for laser paper printing according to claim 1, characterized in that: the step B specifically includes: hanging the copper-plated roller body and nesting it on the outside of the roller body A circular film, the circular film is connected with a box filled with glue, driven by the power of the motor at 10~20Hz, the circular film moves vertically downward along the roller body at a constant speed, and evenly coats a layer on the outside of the roller body 0.05~0.25mm glue, dry naturally for 30~40min after coating. 3. A manufacturing process for a plate roller for laser paper printing according to claim 1, characterized in that: in the step C, the design of the pattern comprises the following steps: (1) Scanning: Select the wood grain, use a high-definition lens with a focal length of 120mm, and an input resolution of 1800~2000dpi to scan the wood grain, and the distance between the lens and the scanning platform is 45~55cm; (2) Processing: adjust the scanned image to a resolution of 800~1000dpi, and perform color separation, color correction, and version revision processing on the scanned image; reduce the resolution to 304.8dpi to obtain a designed pattern. 4. The manufacturing process of a forme roller for laser paper printing according to claim 1, characterized in that: in the step C, the parameters of the laser engraving are: the motor power is 30~50W, and the rotation speed of the roller body is 700~900r/min, engraving time is 1~3h, focal length is 20~24mm. 5. A kind of forme roller that is used for the manufacturing process of the forme roller of laser paper printing according to any one of claims 1 to 4, comprising a roller body, is characterized in that: the outer surface of the roller body is provided with a non-printing area and In the printing area, the surface of the non-printing area is fixedly connected with a copper plating layer, and the surface of the printing area is provided with a laser engraving layer. Both the surface of the copper plating layer and the laser engraving layer are fixedly connected with a chrome plating layer. The number of engraving screen lines and engraving screen angles of the first engraving layer are different from those of the second engraving layer. 6. A plate roller for laser paper printing according to claim 5, characterized in that: the thicknesses of the copper plating layer, the laser engraving layer and the chrome plating layer are 10~14um, 100~150um and 4~ 6um.