Printing plate roller machining process

Abstract

The invention discloses a printing plate roller machining process. The printing plate roller machining process comprises the following steps that roller body machining is conducted, specifically, a seamless steel pipe with the wall thickness being 15-18 mm is selected to be machined into a printing roller body; nickel plating is conducted, specifically, nickel plating is conducted in a semi-immersion mode, and a nickel layer with the thickness being 10 micrometers is formed; copper plating is conducted, specifically, copper plating machining is conducted in a semi-immersion mode, and a copper layer with the thickness of 0.12-0.15 mm is formed on the surface of the roller body; finish machining is conducted, specifically, finish machining treatment is conducted on the copper-plated plate roller; electronic engraving is conducted, specifically, laser engraving is conducted on the surface of the roller through a laser engraving machine; cleaning: cleaning the plate roller by using a methanol aqueous solution in a spraying manner; and chromium plating is conducted, specifically, the roller body is immersed in an electroplating bath to be subjected to chromium plating machining, and a chromium layer with the thickness being 5-7 microns is formed.

Description

Technical Field

[0001] The invention relates to the technical field of printing plate rollers, in particular to a printing plate roller processing technology. Background Art

[0002] The printing technology of printing plate roller is a printing technology that is often used at present, and it occupies an important share in the entire printing industry in my country. Especially in the packaging field of the printing industry, it has performance and cost advantages that cannot be replaced by other printing methods. Printing products made by gravure printing have the advantages of thick ink layer, bright and regular color distribution, and can perfectly restore the original effect.

[0003] In order to print faster and with better quality, it is necessary to use printing machinery with better quality and higher efficiency. At the same time, the printing plate roller is a very important accessory in printing, and its quality also greatly affects the printing quality and efficiency. The commonly used plate roller is copper-plated on the surface of the roller, engraved with a pattern by a gravure electronic engraving machine, and then plated with a layer of chrome. The concentricity of the printing plate roller processed in this way is poorly matched with the printing equipment, which is easy to cause uneven force during printing, resulting in some places being clear and some places being blurred during printing. The way to solve this problem is to reduce the printing speed, which makes the existing printing presses unable to meet high-speed printing.

[0004] Therefore, in order to increase the printing speed of the printing press, it is necessary to make a high-precision printing plate roller to match the high-speed printing press. Summary of the invention

[0005] In order to solve the problem of the troublesome replacement of traditional printing plate rollers, the purpose of the present invention is to provide a printing plate roller processing technology, which can realize the processing of high-precision printing rollers by optimizing the process route.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solution: a printing plate roller processing process, comprising the following steps: A. Roller body processing: Select seamless steel pipe with a wall thickness of 15~18mm as the processing base material, and form the printing roller body through rough processing; B. Nickel plating: The processed plate roller is degreased and cleaned by a cleaning machine to remove oil and rust on the surface, and then nickel-plated by semi-immersion to form a nickel layer with a thickness of 10μm on the surface of the roller; C. Copper plating: The roller body after nickel plating is polished and cleaned, and then copper plating is performed in a semi-immersion manner to form a 0.12~0.15mm thick copper layer on the roller surface, and the copper layer hardness HV reaches 200~220; D. Finishing: The copper-plated plate roller is finished to make the static balance tolerance of the plate roller less than 100g, the radial runout tolerance ≤0.03mm, the straightness tolerance ≤0.03mm, the end surface roughness Ra <6, the copper layer thickness >0.12mm, and the Vickers hardness of the copper layer 180°~200°; E. Electronic engraving: Input the pattern to be engraved into the laser engraving machine, place the plate roller to be processed on the laser engraving machine to laser engrave the roller surface; F. Corrosion: Place the developed plate roller in a corrosive liquid environment for spray corrosion treatment; the corrosive liquid is a FeCl3 solution with a Baume degree of 35 to 36, the corrosion time is 5 to 8 seconds, and the corrosion temperature is 30 to 33°C; F. Cleaning: Use methanol and water solution to spray the plate roller to clean it; G. Chrome plating: Place the cleaned plate roller into a plating tank filled with chrome plating liquid for chrome plating, forming a chromium layer with a thickness of 5~7μm on the surface of the roller.

[0007] Preferably, the rough machining in step A includes two machining processes: turning and grinding.

[0008] Preferably, during the degreasing cleaning in step B, the cleaning temperature is maintained at 35°, the current density is 8A / d㎡, and the roller rotation speed is 50-70m / min.

[0009] Preferably, during the nickel plating process in step B, the current density is controlled to be 5A / d㎡, the voltage is 12V, the roller rotation speed is 30-60m / min, and the plating solution temperature is 40°.

[0010] Preferably, during the copper plating process in step C, the roller rotation speed is 80-100 m / min, the temperature is 30°, and the conductivity is <10.

[0011] Preferably, the finishing in step D includes several processing processes including turning, 300# finishing and polishing.

[0012] Compared with the prior art, the beneficial effect of the present invention is that the processing of a high-precision printing roller is achieved by optimizing the process route. DETAILED DESCRIPTION

[0013] The technical solutions in the embodiments of the present invention will be described clearly and completely below in combination with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0014] The present invention provides a printing plate roller processing process, comprising the following steps: A. Roller body processing: seamless steel pipe is selected as the processing base material, and the printing roller body is formed by rough processing. The wall thickness of the seamless steel pipe is 15~18mm, and the wall roughness Ra=3. The rough processing includes two processing processes: turning and grinding. B. Nickel plating: The processed plate roller is degreased and cleaned by a cleaning machine to remove oil and rust on the surface, and then nickel-plated by semi-immersion to form a nickel layer with a thickness of 10μm on the surface of the roller; During degreasing cleaning, the cleaning temperature is maintained at 35°, the current density is 8A / d㎡, and the roller rotation speed is 50~70m / min; During nickel plating, the current density is controlled to be 5A / d㎡, the voltage is 12V, the roller rotation speed is 30~60m / min, and the plating solution temperature is 40°; C. Copper plating: The roller body after nickel plating is polished and cleaned, and then copper plating is performed in a semi-immersion manner to form a 0.12~0.15mm thick copper layer on the roller surface, and the copper layer hardness HV reaches 200~220. During the copper plating process, the roller body rotation speed is 80~100m / min, the temperature is 30°, and the conductivity is <10 (pure water configuration); D. Finishing: The copper-plated plate roller is subjected to finishing treatment, so that the static balance tolerance of the plate roller is less than 100g, the radial runout tolerance is ≤0.03mm, the straightness tolerance is ≤0.03mm, the end surface roughness Ra is less than 6, the copper layer thickness is greater than 0.12mm, and the Vickers hardness of the copper layer is 180°~200°. The finishing includes lathing, 300# fine grinding, and polishing. E. Electronic engraving: Input the pattern to be engraved into the laser engraving machine, place the plate roller to be processed on the laser engraving machine to laser engrave the roller surface; F. Corrosion: Place the developed plate roller in a corrosive liquid environment for spray corrosion treatment; the corrosive liquid is a FeCl3 solution with a Baume degree of 35 to 36, the corrosion time is 5 to 8 seconds, and the corrosion temperature is 30 to 33°C; F. Cleaning: The plate roller is cleaned by spraying, and the cleaning liquid is preferably methanol-water solution; G. Chrome plating: The cleaned plate roller is placed in a plating tank filled with chrome plating liquid for chrome plating, forming a chromium layer with a thickness of 5~7μm on the surface of the roller.

[0015] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A printing plate roller processing process, characterized in that The steps include: A. Roller body processing: Select seamless steel pipe with a wall thickness of 15~18mm as the processing base material, and form the printing roller body through rough processing; B. Nickel plating: The processed plate roller is degreased and cleaned by a cleaning machine to remove oil and rust on the surface, and then nickel-plated by semi-immersion to form a nickel layer with a thickness of 10μm on the surface of the roller; C. Copper plating: The roller body after nickel plating is polished and cleaned, and then copper plating is performed in a semi-immersion manner to form a 0.12~0.15mm thick copper layer on the roller surface, and the copper layer hardness HV reaches 200~220; D. Finishing: The copper-plated plate roller is finished to make the static balance tolerance of the plate roller less than 100g, the radial runout tolerance ≤0.03mm, the straightness tolerance ≤0.03mm, the end surface roughness Ra <6, the copper layer thickness >0.12mm, and the Vickers hardness of the copper layer 180°~200°; E. Electronic engraving: Input the pattern to be engraved into the laser engraving machine, place the plate roller to be processed on the laser engraving machine to laser engrave the roller surface; F. Corrosion: Place the developed plate roller in a corrosive liquid environment for spray corrosion treatment; the corrosive liquid is a FeCl3 solution with a Baume degree of 35 to 36, the corrosion time is 5 to 8 seconds, and the corrosion temperature is 30 to 33°C; F. Cleaning: Use methanol and water solution to spray the plate roller to clean it; G. Chrome plating: The cleaned plate roller is placed in a plating tank filled with chrome plating liquid for chrome plating, forming a chromium layer with a thickness of 5~7μm on the surface of the roller.

2. A printing plate roller processing process as claimed in claim 1, characterized in that: The rough machining in step A includes two machining processes: turning and grinding.

3. A printing plate roller processing process as claimed in claim 1, characterized in that: During the degreasing cleaning in step B, the cleaning temperature is maintained at 35°, the current density is 8A / d㎡, and the roller rotation speed is 50-70m / min.

4. A printing plate roller processing process as claimed in claim 1, characterized in that: During the nickel plating process in step B, the current density is controlled to be 5A / d㎡, the voltage is 12V, the roller rotation speed is 30-60m / min, and the plating solution temperature is 40°.

5. A printing plate roller processing process as claimed in claim 1, characterized in that: During the copper plating process in step C, the roller rotation speed is 80-100 m / min, the temperature is 30°, and the conductivity is less than 10.

6. A printing plate roller processing process as claimed in claim 1, characterized in that: The finishing process in step D includes turning, 300# finishing and polishing.