Color-coated sheet production line adopting pre-primer coating and electron beam curing and production method of color-coated sheet production line

Abstract

The invention belongs to the technical field of steel strip surface coating processing, and particularly relates to a color-coated sheet production line adopting a pre-primer coating and electron beam curing and a production method of the color-coated sheet production line. The production line comprises an inlet section, a degreasing cleaning section, a first pre-primer section, a first fine coating section, a printing section, a second fine coating section and an outlet section which are sequentially arranged, the first pre-primer section is used for forming a pre-primer coating on the surface of a base plate, the first fine coating section is used for coating and curing finish paint or printing ground color, and the printing section is used for printing figures or patterns on a color-coated plate. And the second fine coating section is used for coating and curing finish paint or finishing paint. According to the invention, the pre-primer section is arranged, a pre-primer coating is adopted to replace a'pretreatment layer 'and a'primer layer' of traditional color coating, and electron beam curing is adopted to replace traditional hot air curing in the first fine coating section, so that the production line speed is greatly improved, and the method has the advantages of greenness, energy conservation, flexibility and the like; and three kinds of color-coated plates including a standard painted plate, a finishing paint color-coated plate and a printing color-coated plate are produced on the same unit.

Description

Technical Field

[0001] This invention belongs to the field of steel strip surface coating technology, and specifically relates to a color-coated steel sheet production line and its production method that employs a pre-base integrated coating and electron beam curing. Background Technology

[0002] Color-coated steel sheet, also known as pre-coated sheet, is a type of sheet made from metal coils such as cold-rolled steel sheet, galvanized steel sheet, or aluminum sheet. After surface pretreatment (cleaning, chemical coating), one or more layers of organic coating are applied on a continuous production line, followed by baking and curing. Due to its combination of excellent decorative and protective properties of the outer coating with the high strength and easy processing of the substrate, color-coated steel sheet is widely used in construction, home appliances, and automotive industries.

[0003] The main production process of color-coated steel sheets includes: degreasing and cleaning → substrate pretreatment → drying → primer coating → curing → topcoat coating → curing → cooling and post-treatment. Although traditional color-coated steel sheet production lines are technologically mature, they are generally characterized by "high emissions, high energy consumption, and rigidity." In today's era of pursuing green, energy-saving, and flexible manufacturing, their problems are becoming increasingly prominent, mainly manifested in the following ways: 1. High emissions: The substrate pretreatment (chemical conversion film treatment) process generates wastewater containing heavy metals, which has high treatment costs and great environmental pressure; traditional solvent-based coatings contain a large amount of organic solvents, which will completely volatilize into VOCs (volatile organic compounds) and be emitted into the atmosphere during the baking process. These are important precursors to PM2.5 and ozone pollution.

[0004] 2. High energy consumption: In the baking and curing process, traditional hot air curing requires heating the substrate, the huge oven rollers and air to high temperatures in an oven that is tens of meters long. Only a small portion of the energy is actually used for coating curing, resulting in a large waste of energy.

[0005] 3. Rigidity: Insufficient production flexibility makes it difficult to meet the needs of small batches, multiple varieties, and personalized customization.

[0006] In recent years, with the increasing demands for environmental protection, cost reduction, and personalized customization, the search for a green, energy-saving, and flexible comprehensive solution has become urgent. Pre-coating integration and electronic curing technology, as emerging technologies, possess unique advantages and can largely overcome the shortcomings of traditional color coating pretreatment and curing methods, providing new solutions for color-coated sheet production. Summary of the Invention

[0007] To address the aforementioned problems, the purpose of this invention is to provide a color-coated sheet production line and its production method that employs a pre-primer-coating and electron beam curing process. This invention, by setting up a pre-primer-coating stage, replaces the traditional "pretreatment layer" and "primer layer" of color coating with a pre-primer-coating process, and by employing electron beam curing instead of traditional hot air curing in the fine coating stage, significantly improves the production line speed and has advantages such as being green, energy-saving, and flexible. Furthermore, it enables the production of three types of color-coated sheets—standard coated sheets, clear varnish color-coated sheets, and printed color-coated sheets—on the same unit.

[0008] The technical solution of this invention is as follows: a color-coated steel sheet production line employing a pre-base coating and electron beam curing, comprising an inlet section, a degreasing and cleaning section, a pre-base coating section, a fine coating section, a printing section, a fine coating section 2, and an outlet section arranged sequentially. The pre-base coating section is located between the degreasing and cleaning section and the fine coating section, and is used to form a pre-base coating on the substrate surface. The fine coating section is located between the pre-base coating section and the printing section, and is used for coating and curing topcoat or printing base color. The fine coating section includes a second coater and a curing unit; the second coater is any one of a roller coater or a spray coater, and is used for coating UV coatings or EB coatings; the curing unit is any one of a UV curing unit or an EB curing unit; the UV curing unit is used for curing UV coatings, and the EB curing unit is used for curing EB coatings. The printing section is located between the fine coating section 1 and the fine coating section 2, and is used for printing patterns or designs on the color-coated steel sheet. The fine coating section 2 is located between the printing section and the outlet section, and is used for coating and curing topcoat or clear coat.

[0009] Several steering rollers are respectively provided between the pre-bottoming section and the degreasing and cleaning section, between the pre-bottoming section and the fine coating section, and between the printing section and the fine coating section.

[0010] Several tension rollers are respectively installed between the pre-bottoming section and the degreasing and cleaning section, the fine coating section and the printing section, the printing section and the fine coating section, and the fine coating section and the outlet section.

[0011] Several straightening rollers are respectively provided between the pre-bottoming section and the degreasing and cleaning section, the fine coating section and the printing section, and the printing section and the fine coating section.

[0012] Between the pre-base bonding section and the degreasing and cleaning section, a first alignment roller, a first tension roller, and a first steering roller are sequentially arranged. Between the pre-base bonding section and the fine coating section, a second steering roller, a third steering roller, and a fourth steering roller are sequentially arranged. Between the fine coating section and the printing section, a second alignment roller and a second tension roller are sequentially arranged. Between the printing section and the fine coating section, a third tension roller and a fifth steering roller are sequentially arranged. Between the fine coating section and the exit section, a fourth tension roller is arranged.

[0013] The pre-base bonding section includes a first coater, an electromagnetic dryer, and an air cooler; the first coater is either a roller coater or a spray coater, used for coating the pre-base bonding coating; the electromagnetic dryer is used for curing the pre-base bonding coating; and the air cooler is used for cooling the pre-base bonding coating.

[0014] The printing section includes an inkjet printer and a UV curing unit; the inkjet printer is used to print patterns or designs; the UV curing unit is used to cure the patterns or designs.

[0015] The fine coating stage includes a third coater and an EB curing unit; the third coater is either a roller coater or a spray coater, used for coating EB paint; the EB curing unit is used for curing EB paint.

[0016] A method for a pre-base integrated coating and electron beam curing production line for color-coated steel sheets, using the pre-base integrated coating and electron beam curing production line as described above, includes the following steps: S1: When producing standard painted panels, a standard continuous color coating unit is formed by an inlet section, a degreasing and cleaning section, a pre-priming section, a fine coating section, and an outlet section. The substrate enters the unit through the inlet section, and the surface of the substrate is cleaned through the degreasing and cleaning section. It then enters the pre-priming section through the guide rollers for pre-priming coating and curing to obtain a pre-treated primer panel. The pre-treated primer panel then enters the fine coating section through the guide rollers for topcoat coating and curing to obtain a standard painted panel. Finally, the standard painted panel is output through the outlet section. S2: When producing clear coat color-coated plates, a clear coat continuous color-coating unit is formed by an inlet section, a degreasing and cleaning section, a pre-priming section, a fine coating section, a fine coating section 2, and an outlet section. The substrate enters the unit through the inlet section, and the surface of the substrate is cleaned through the degreasing and cleaning section. It then enters the pre-priming section through a guide roller for pre-priming coating and curing to obtain a pre-treated primer plate. The pre-treated primer plate then enters the fine coating section through a guide roller for topcoat coating and curing to obtain a standard coated plate. Next, the standard coated plate enters the fine coating section through a guide roller for clear coat coating and curing to obtain a clear coat color-coated plate. Finally, the clear coat color-coated plate is output through the outlet section. S3: When producing printed color-coated plates, a continuous printing color-coating unit is formed by an inlet section, a degreasing and cleaning section, a pre-priming section, a fine coating section, a printing section, a fine coating section 2, and an outlet section. The substrate enters the unit through the inlet section, and the surface of the substrate is cleaned through the degreasing and cleaning section. It then enters the pre-priming section through a guide roller for pre-priming coating and curing to obtain a pre-treated primer plate. Next, the pre-treated primer plate enters the fine coating section through a guide roller for printing base color coating and curing to obtain the substrate to be printed. Then, the substrate to be printed enters the printing section through a guide roller for pattern or design printing and curing to obtain a printed semi-finished plate. Next, the printed semi-finished plate enters the fine coating section through a guide roller for topcoat coating and curing to obtain the printed color-coated plate. Finally, the printed color-coated plate is output through the outlet section.

[0017] The technical advantages of this invention are as follows: 1. By setting up a pre-priming stage and a fine coating stage with a curing unit in the color-coated steel sheet production line, the pre-priming coating, UV coating, and EB coating contain virtually no or very little volatile organic compounds, making them green and environmentally friendly coatings. This reduces or eliminates VOC generation at the source. Simultaneously, the pre-priming technology eliminates the complex chemical conversion film treatment process, thus eliminating heavy metal emissions and possessing advantages such as being green, energy-saving, and flexible. 2. By setting up a fine coating stage with a curing unit in the color-coated steel sheet production line, this invention eliminates the energy waste associated with traditional hot air curing, which requires heating the entire cold substrate, the large oven, and the air to high temperatures. Only a small portion of the energy is actually used for coating curing. Curing and EB curing act directly on the coating, with extremely high energy utilization and instant curing, saving energy and allowing for higher production line speeds; 3. The pre-base bonding section of this invention eliminates the need for a separate pretreatment tank, and UV curing and EB curing eliminate the drying process, shortening the production process and reducing the production line's footprint. Inkjet printing is used instead of traditional gravure printing machines (or roller coating machines) to print patterns, improving the flexibility of the production line and better meeting the needs of small-batch, multi-variety, and personalized customization; 4. This invention enables the production of three types of color-coated sheets—standard coated sheets, clear varnish coated sheets, and printed color-coated sheets—on the same unit, making it particularly suitable for upgrading existing production lines and for construction sites where large pretreatment and drying oven production lines cannot be installed.

[0018] The following will provide further explanation in conjunction with the accompanying drawings. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a color-coated steel sheet production line that employs a pre-base integrated coating and electron beam curing according to the present invention.

[0020] Reference numerals: 1. Inlet section; 2. Degreasing and cleaning section; 3. First alignment roller; 4. First tension roller; 5. First steering roller; 6. Pre-coating section; 7. Second steering roller; 8. Third steering roller; 9. Fourth steering roller; 10. Fine coating section; 11. Second alignment roller; 12. Second tension roller; 13. Printing section; 14. Third tension roller; 15. Fifth steering roller; 16. Fine coating section 2; 17. Fourth tension roller; 18. Outlet section; 6-1. First coater; 6-2. Electromagnetic dryer; 6-3. Air cooler; 10-1. Second coater; 10-2. Curing unit; 13-1. Inkjet printer; 13-2. UV curing unit; 16-1. Third coater; 16-2. EB curing unit. Detailed Implementation Example 1

[0021] like Figure 1 As shown, a color-coated steel sheet production line employing a pre-base bonding coating and electron beam curing includes an inlet section 1, a degreasing and cleaning section 2, a pre-base bonding section 6, a fine coating section 10, a printing section 13, a fine coating section 2 16, and an outlet section 18 arranged sequentially. The pre-base bonding section 6 is located between the degreasing and cleaning section 2 and the fine coating section 10, and is used to form a pre-base bonding coating on the substrate surface. The fine coating section 10 is located between the pre-base bonding section 6 and the printing section 13, and is used for coating and curing the topcoat or printing base color. The fine coating section 10 includes a second coater 10-1 and a curing unit. The first coating unit 10-2 is a roller coater or a spray coater, used for coating UV or EB paints; the second coating unit 10-1 is a UV curing unit or an EB curing unit; the UV curing unit is used for curing UV paints, and the EB curing unit is used for curing EB paints; the printing section 13 is located between the first fine coating section 10 and the second fine coating section 16, used for printing patterns or designs on the color-coated sheet; the second fine coating section 16 is located between the printing section 13 and the exit section 18, used for coating and curing topcoat or clear coat.

[0022] In this invention, the substrate enters from the inlet section 1, is cleaned by the degreasing and cleaning section 2, and then guided by the guide rollers into the pre-priming section 6. In the pre-priming section 6, the first coater 6-1 applies a pre-priming coating to the substrate, which is then rapidly cured by the electromagnetic dryer 6-2 and cooled by the air cooler 6-3 to form a pre-treated primer plate. The pre-treated primer plate then enters the fine coating section 10 via the guide rollers, where a second coater 10-1 applies a UV or EB coating, followed by instant curing by the curing unit 10-2 (UV or EB curing unit). Afterward, the substrate can continue to the printing section 13 for pattern printing, or directly enter the fine coating section 16 for topcoat or clear coat application, and finally exit from the outlet section 18, completing the color-coated sheet production. This invention uses a pre-priming coating, eliminating the traditional pre-treatment and primer processes, reducing heavy metal and VOC emissions. UV / EB curing is fast and energy consumption is low, significantly increasing production line speed. The production line has high integration, a small footprint, and is suitable for on-site modification and upgrades. Example 2

[0023] Based on Example 1, in this example, preferably, several steering rollers are provided between the pre-bottoming section 6 and the degreasing and cleaning section 2, between the pre-bottoming section 6 and the fine coating section 10, and between the printing section 13 and the fine coating section 2 16.

[0024] In this invention, several steering rollers are respectively installed between the pre-coating section 6 and the degreasing and cleaning section 2, between the pre-coating section 6 and the fine coating section 10, and between the printing section 13 and the fine coating section 16 to ensure that the substrate turns smoothly and avoid damage to the coating during the turning process. The reasonable layout of the steering rollers allows the production line to flexibly adjust the substrate direction according to process requirements and supports the rapid switching of multiple product paths (such as standard boards, coating boards, and printing boards). Example 3

[0025] Based on Example 1 or Example 2, in this embodiment, preferably, several tension rollers are provided between the pre-bottoming section 6 and the degreasing and cleaning section 2, the fine coating section 10 and the printing section 13, the printing section 13 and the fine coating section 16, and the fine coating section 16 and the outlet section 18.

[0026] When this invention is used, several tension rollers are respectively provided between the pre-coating section 6 and the degreasing and cleaning section 2, the fine coating section 10 and the printing section 13, the printing section 13 and the fine coating section 2 16, the fine coating section 2 16 and the outlet section 18. By adjusting the tension between the rollers, it is ensured that the substrate remains flat and wrinkle-free during operation, especially avoiding coating defects caused by uneven tension during the coating and curing process. Example 4

[0027] Based on Example 1 or Example 3, in this embodiment, preferably, a number of correction rollers are respectively provided between the pre-bottoming section 6 and the degreasing and cleaning section 2, the fine coating section 10 and the printing section 13, and the printing section 13 and the fine coating section 16.

[0028] When this invention is used, several correction rollers are respectively provided between the pre-coating section 6 and the degreasing and cleaning section 2, the fine coating section 10 and the printing section 13, and the printing section 13 and the fine coating section 2 16. The position of the substrate is detected and adjusted in real time to ensure that it always runs along the center line and avoids uneven coating or equipment collision caused by deviation. Example 5

[0029] Based on Embodiment 1 or Embodiment 4, in this embodiment, preferably, a first correction roller 3, a first tension roller 4, and a first steering roller 5 are sequentially arranged between the pre-bottoming section 6 and the degreasing and cleaning section 2; a second steering roller 7, a third steering roller 8, and a fourth steering roller 9 are sequentially arranged between the pre-bottoming section 6 and the fine coating section 10; a second correction roller 11 and a second tension roller 12 are sequentially arranged between the fine coating section 10 and the printing section 13; a third tension roller 14 and a fifth steering roller 15 are sequentially arranged between the printing section 13 and the fine coating section 16; and a fourth tension roller 17 is arranged between the fine coating section 16 and the exit section 18.

[0030] In use, the present invention comprises a first alignment roller 3, a first tension roller 4, and a first steering roller 5 sequentially arranged between the pre-coating section 6 and the degreasing and cleaning section 2; a second steering roller 7, a third steering roller 8, and a fourth steering roller 9 sequentially arranged between the pre-coating section 6 and the fine coating section 10; a second alignment roller 11 and a second tension roller 12 sequentially arranged between the fine coating section 10 and the printing section 13; a third tension roller 14 and a fifth steering roller 15 sequentially arranged between the printing section 13 and the second fine coating section 16; and a fourth tension roller 17 arranged between the second fine coating section 16 and the exit section 18, forming a continuous guiding and tension control system. For example, after passing through the degreasing and cleaning section 2, the substrate sequentially passes through the first alignment roller 3, the first tension roller 4, and the first steering roller 5 into the pre-coating section 6, achieving precise positioning and stable transport. Example 6

[0031] Based on Example 1 or Example 5, in this embodiment, preferably, the pre-base bonding section 6 includes a first coater 6-1, an electromagnetic dryer 6-2, and an air cooler 6-3; the first coater 6-1 is any one of a roller coater or a spray coater, used for coating the pre-base bonding coating; the electromagnetic dryer 6-2 is used for curing the pre-base bonding coating; and the air cooler 6-3 is used for cooling the pre-base bonding coating.

[0032] In use, during the pre-priming stage 6, the first coater 6-1 (roller coater or spray coater) evenly coats the pre-priming coating onto the substrate surface. It is then rapidly cured by an electromagnetic dryer 6-2 (eliminating the need for a traditional oven), and finally cooled to a suitable temperature by an air cooler 6-3, providing an ideal substrate for subsequent coating. Electromagnetic drying is highly efficient and energy-saving, with rapid curing. The pre-priming coating combines pretreatment and primer functions, simplifying the process and offering strong environmental friendliness. Example 7

[0033] Based on Embodiment 1 or Embodiment 6, in this embodiment, preferably, the printing segment 13 includes an inkjet printer 13-1 and a UV curing unit 13-2; the inkjet printer 13-1 is used to print patterns or designs; and the UV curing unit 13-2 is used to cure the patterns or designs.

[0034] When this invention is used, the inkjet printer 13-1 in the printing section 13 prints customized patterns or designs on the substrate surface, and then the UV curing unit 13-2 instantly cures the patterns, achieving high-precision, multi-color printing without the need to replace the printing plate, and supporting personalized customization. Example 8

[0035] Based on Example 1 or Example 7, in this embodiment, preferably, the fine coating stage 16 includes a third coater 16-1 and an EB curing unit 16-2; the third coater 16-1 is any one of a roller coater or a spray coater, used for coating EB paint; the EB curing unit 16-2 is used for curing EB paint.

[0036] When this invention is used, the third coater 16-1 in the fine coating stage 16 applies EB clear coat or topcoat, and then the EB curing unit 16-2 performs high-energy electron beam curing to form a surface coating with high hardness and high weather resistance. Example 9

[0037] A method for a pre-base integrated coating and electron beam curing production line for color-coated steel sheets, using the pre-base integrated coating and electron beam curing production line as described above, includes the following steps: S1: When producing standard painted panels, a standard continuous color coating unit is formed by inlet section 1, degreasing and cleaning section 2, pre-priming section 1 6, fine coating section 2 16, and outlet section 18. The substrate enters the unit through inlet section 1, and the surface of the substrate is cleaned through degreasing and cleaning section 2. It then enters pre-priming section 1 6 through a guide roller for pre-priming coating and curing to obtain a pre-treated primer panel. The pre-treated primer panel then enters fine coating section 2 16 through a guide roller for topcoat coating and curing to obtain a standard painted panel. Finally, the standard painted panel is output through outlet section 18. S2: When producing clear coat color-coated plates, a clear coat continuous color-coating unit is formed by inlet section 1, degreasing and cleaning section 2, pre-priming section 6, fine coating section 10, fine coating section 2 16, and outlet section 18. The substrate enters the unit through inlet section 1, and the surface of the substrate is cleaned through degreasing and cleaning section 2. It then enters pre-priming section 6 through a guide roller for pre-priming coating and curing to obtain a pre-treated primer plate. The pre-treated primer plate then enters fine coating section 10 through a guide roller for topcoat coating and curing to obtain a standard coated plate. Next, the standard coated plate enters fine coating section 2 16 through a guide roller for clear coat coating and curing to obtain a clear coat color-coated plate. Finally, the clear coat color-coated plate is output through outlet section 18. S3: When producing printed color-coated plates, a continuous printing color-coating unit is formed by inlet section 1, degreasing and cleaning section 2, pre-base coating section 6, fine coating section 10, printing section 13, fine coating section 2 16, and outlet section 18. The substrate enters the unit through inlet section 1, and the surface of the substrate is cleaned through degreasing and cleaning section 2. It then enters pre-base coating section 6 through a guide roller for pre-base coating and curing to obtain a pre-treated primer plate. Next, the pre-treated primer plate enters fine coating section 10 through a guide roller for printing base color coating and curing to obtain the substrate to be printed. Then, the substrate to be printed enters printing section 13 through a guide roller for pattern or design printing and curing to obtain a printed semi-finished plate. Next, the printed semi-finished plate enters fine coating section 2 16 through a guide roller for topcoat coating and curing to obtain the printed color-coated plate. Finally, the printed color-coated plate is output through outlet section 18.

[0038] This invention enables the production of three types of color-coated sheets—standard coated sheets, clear varnish coated sheets, and printed color-coated sheets—on the same unit. It is particularly suitable for upgrading existing production lines and for construction sites where large-scale pretreatment and drying oven production lines cannot be installed.

[0039] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A production line for a pre-coated sheet with an e-beam cured color coating, characterized in that: The coating machine comprises an entry section (1), a degreasing and cleaning section (2), a pre-base-one section (6), a fine coating one section (10), a printing section (13), a fine coating two section (16) and an exit section (18) arranged in sequence, the pre-base-one section (6) is arranged between the degreasing and cleaning section (2) and the fine coating one section (10) and is used for forming a pre-base-one coating on the surface of the substrate, the fine coating one section (10) is arranged between the pre-base-one section (6) and the printing section (13) and is used for coating and curing a top coat or a printing base color, the fine coating one section (10) comprises a second coating device (10-1) and a curing device (10-2), the second coating device (10-1) is any one of a roll coater and a spraying machine and is used for coating UV paint or EB paint, the curing device (10-2) is any one of a UV curing device and an EB curing device, the UV curing device is used for curing the UV paint, the EB curing device is used for curing the EB paint, the printing section (13) is arranged between the fine coating one section (10) and the fine coating two section (16) and is used for printing patterns or designs on the color coated board, and the fine coating two section (16) is arranged between the printing section (13) and the exit section (18) and is used for coating and curing a top coat or a finishing coat.

2. A production line for the production of a prepainted sheet with an e-beam cured coating according to claim 1, characterized in that: A plurality of deflection rollers are arranged between the pre-base-one section (6) and the degreasing and cleaning section (2), the fine coating one section (10) and the printing section (13), the printing section (13) and the fine coating two section (16), the fine coating two section (16) and the exit section (18).

3. A production line for the production of a pre-painted sheet with an integrated coating and electron beam curing according to claim 1, characterized in that: A plurality of tension rollers are arranged between the pre-base-one section (6) and the degreasing and cleaning section (2), the fine coating one section (10) and the printing section (13), the printing section (13) and the fine coating two section (16), the fine coating two section (16) and the exit section (18).

4. A production line for the production of a prepainted sheet with an e-beam cured coating according to claim 1, characterized in that: A plurality of correction rollers are arranged between the pre-base-one section (6) and the degreasing and cleaning section (2), the fine coating one section (10) and the printing section (13), the printing section (13) and the fine coating two section (16).

5. A production line for the production of a prepainted sheet with an e-beam cured paint coat according to claim 1, characterized in that: The pre-base-one section (6) comprises a first correction roller (3), a first tension roller (4) and a first deflection roller (5) arranged in sequence between the pre-base-one section (6) and the degreasing and cleaning section (2), a second deflection roller (7), a third deflection roller (8) and a fourth deflection roller (9) arranged in sequence between the pre-base-one section (6) and the fine coating one section (10), a second correction roller (11) and a second tension roller (12) arranged in sequence between the fine coating one section (10) and the printing section (13), a third tension roller (14) and a fifth deflection roller (15) arranged in sequence between the printing section (13) and the fine coating two section (16), and a fourth tension roller (17) arranged between the fine coating two section (16) and the exit section (18).

6. A production line for the production of a precoated sheet with an integrated coating and electron beam curing according to claim 1, characterized in that The pre-base-one section (6) comprises a first coating device (6-1), an electromagnetic drying device (6-2) and an air cooling device (6-3), the first coating device (6-1) is any one of a roll coater and a spraying machine and is used for coating a pre-base-one paint, the electromagnetic drying device (6-2) is used for curing the pre-base-one paint, and the air cooling device (6-3) is used for cooling the pre-base-one coating.

7. A production line for the production of a pre-painted sheet with an integrated coating and electron beam curing according to claim 1, characterized in that: The printing section (13) comprises an inkjet printer (13-1) and a UV curing device (13-2); the inkjet printer (13-1) is used for printing patterns or designs; and the UV curing device (13-2) is used for curing the patterns or designs.

8. A production line for the production of a pre-painted sheet with an integrated coating and electron beam curing according to claim 1, characterized in that: The second finishing section (16) comprises a third coating device (16-1) and an EB curing device (16-2); the third coating device (16-1) is any one of a roll coater and a spray coater, and is used for EB coating; and the EB curing device (16-2) is used for curing the EB coating.

9. A method for producing a pre-coated sheet using a pre-coated sheet production line with electron beam curing, using the pre-coated sheet production line with electron beam curing according to claim 1, characterized in that: The method comprises the following steps: S1: when producing a standard painted plate, a standard painted continuous color coating unit is formed by the inlet section (1), the degreasing and cleaning section (2), the pre-base one-section (6), the second finishing section (16), and the outlet section (18); the base plate enters the unit through the inlet section (1), is cleaned on the surface by the degreasing and cleaning section (2), is coated with the pre-base one coating and cured in the pre-base one-section (6), and a pretreated base plate is obtained; then the pretreated base plate is coated with a topcoat and cured in the second finishing section (16), and a standard painted plate is obtained; finally, the standard painted plate is output through the outlet section (18); S2: when producing a cover lacquer color coated plate, a cover lacquer continuous color coating unit is formed by the inlet section (1), the degreasing and cleaning section (2), the pre-base one-section (6), the first finishing section (10), the second finishing section (16), and the outlet section (18); the base plate enters the unit through the inlet section (1), is cleaned on the surface by the degreasing and cleaning section (2), is coated with the pre-base one coating and cured in the pre-base one-section (6), and a pretreated base plate is obtained; then the pretreated base plate is coated with a topcoat and cured in the first finishing section (10), and a standard painted plate is obtained; then the standard painted plate is coated with a cover lacquer and cured in the second finishing section (16), and a cover lacquer color coated plate is obtained; finally, the cover lacquer color coated plate is output through the outlet section (18); S3: when producing a printed color coated plate, a continuous printed color coating unit is formed by the inlet section (1), the degreasing and cleaning section (2), the pre-base one-section (6), the first finishing section (10), the printing section (13), the second finishing section (16), and the outlet section (18); the base plate enters the unit through the inlet section (1), is cleaned on the surface by the degreasing and cleaning section (2), is coated with the pre-base one coating and cured in the pre-base one-section (6), and a pretreated base plate is obtained; then the pretreated base plate is coated with a printed base color and cured in the first finishing section (10), and a printed base plate is obtained; then the printed base plate is printed with patterns or designs and cured in the printing section (13), and a printed semi-finished plate is obtained; then the printed semi-finished plate is coated with a cover lacquer and cured in the second finishing section (16), and a printed color coated plate is obtained; finally, the printed color coated plate is output through the outlet section (18).

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