CN110523605B - Coating method of 3D color-coated printed galvanized steel plate - Google Patents

Coating method of 3D color-coated printed galvanized steel plate Download PDF

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Publication number
CN110523605B
CN110523605B CN201910862361.XA CN201910862361A CN110523605B CN 110523605 B CN110523605 B CN 110523605B CN 201910862361 A CN201910862361 A CN 201910862361A CN 110523605 B CN110523605 B CN 110523605B
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galvanized steel
steel sheet
roller
printed
printing
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CN110523605A (en
Inventor
宋章峰
郭丽涛
郭振胜
赵国涛
郭东学
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Shandong Guanzhou Co ltd
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Shandong Guanzhou Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/002—Pretreatement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/007—After-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
    • B05D3/0413—Heating with air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/10—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by other chemical means
    • B05D3/102—Pretreatment of metallic substrates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
    • B05D5/065—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects having colour interferences or colour shifts or opalescent looking, flip-flop, two tones
    • B05D5/066—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects having colour interferences or colour shifts or opalescent looking, flip-flop, two tones achieved by multilayers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/56—Three layers or more
    • B05D7/58—No clear coat specified
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/02—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F7/00—Rotary lithographic machines
    • B41F7/02—Rotary lithographic machines for offset printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F7/00—Rotary lithographic machines
    • B41F7/16—Rotary lithographic machines for printing on non-deformable material, e.g. sheet metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/06—Lithographic printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/26—Printing on other surfaces than ordinary paper
    • B41M1/28—Printing on other surfaces than ordinary paper on metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/06—Veined printings; Fluorescent printings; Stereoscopic images; Imitated patterns, e.g. tissues, textiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/009—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using thermal means, e.g. infrared radiation, heat

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Vascular Medicine (AREA)
  • Textile Engineering (AREA)
  • Thermal Sciences (AREA)
  • Toxicology (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Printing Methods (AREA)

Abstract

The invention discloses a coating method of a 3D color-coated printed galvanized steel plate, which comprises the following steps: step one, uncoiling and feeding; step two, degreasing and cleaning; step three, passivating and drying; step four, coating a primer and a back paint; fifthly, leveling and curing the primer and the back paint; step six, printing; step seven, drying the printing ink; step eight, coating finish paint; step nine, leveling and curing the finish paint; step ten, film covering; step eleven, withdrawal straightening; step twelve, rolling the finished product. The coating method can effectively improve the antirust capacity of the board, prolong the service life of the board, and effectively carry out quantitative cutting and polishing on the oxide on the surface of the rubber roller through a cleaning mechanism of a 3D printing machine, so that the adhesiveness of the printing on the surface of the rubber roller is maintained, the deinking phenomenon caused by an oxide film generated by oxidation after the surface of the rubber roller is contacted with the pigment is avoided, the attractiveness of the printing is further ensured, the printed pattern can effectively keep the three-dimensional sense, and the applicability and the selectivity of the board are improved.

Description

Coating method of 3D color-coated printed galvanized steel plate
Technical Field
The invention relates to the field of coating of steel plate materials, in particular to a coating method of a 3D color-coated printed galvanized steel plate.
Background
The 3D printing color-coated plate is a steel plate with various patterns or designs printed on the plate surface, has the characteristics of light weight, attractive appearance, strong decoration, strong corrosion resistance and the like, and is widely applied to the industries of buildings, manufacture, electric appliances, decoration and the like.
At present, the printed color-coated sheet in China is mainly a common color-coated sheet for buildings, and due to the limitation of the traditional process level, printed patterns cannot be well combined with a substrate, so that the patterns of the traditional printed sheet are easy to age, and the performances such as wear resistance, scratch resistance and the like are poor; and the flatness of paint can not be guaranteed when paint is coated on the existing printing plate, the pattern shape after printing is very easily influenced, the three-dimensional sense of pattern patterns can not be guaranteed, the attractiveness of the pattern plate is easily reduced, in addition, the printing varieties and the number of the traditional printing color plate are relatively less, especially along with the continuous improvement of the product attractiveness and quality requirements of people in recent years, the traditional printing plate can not meet the requirements of economic development.
Disclosure of Invention
1. Technical problem to be solved
The technical problem to be solved by the invention is to provide a coating method of a 3D color-coated printed galvanized steel sheet, which can effectively improve the antirust capacity of the sheet, prolong the service life of the sheet, effectively ensure the flatness and glossiness of a paint film, facilitate the maintenance of the stereoscopic impression of printed patterns, improve the decoration and aesthetic measure of the sheet, and effectively improve the applicability and the selectivity of the sheet.
2. Technical scheme
In order to solve the problems, the invention adopts the following technical scheme:
a coating method of a 3D color-coated printed galvanized steel sheet comprises the following steps:
step one, uncoiling and feeding: placing the rolled galvanized steel sheet into an uncoiler for uncoiling;
step two, degreasing and cleaning: soaking the uncoiled galvanized steel sheet in a degreasing tank with a cleaning agent to carry out roller brush degreasing, then adopting circulating water to carry out spray cleaning on the galvanized steel sheet, and drying by hot air to obtain a clean galvanized steel sheet;
step three, passivating and drying: putting the cleaned galvanized steel sheet in the step two into a roller coater to roll coat the passivation film liquid on the front surface and the back surface of the galvanized steel sheet, so that a layer of passivation film is formed on the front surface and the back surface of the galvanized steel sheet, wherein the thickness of the passivation film is 2-3 mu m, then putting the galvanized steel sheet coated with the passivation film into a drying box to be dried, wherein the drying temperature is 75-85 ℃, the drying time is 8-15 s, and drying the galvanized steel sheet coated with the passivation film by using circulating hot air after drying is finished, so as to obtain the galvanized steel sheet with the passivation film;
step four, coating a primer and a back paint: coating priming paint and back paint on the front side and the back side of the galvanized steel sheet with the passivation film obtained in the third step by using a roller coater, wherein the thickness of the priming paint and the thickness of the back paint are both 5-7 mu m, so as to obtain the galvanized steel sheet with the priming paint and the back paint;
step five, leveling and curing of the primer and the back paint: placing the galvanized steel sheet with the primer and the back paint obtained in the fourth step into a closed and clean leveling machine with a certain air flow rate to level the galvanized steel sheet, controlling the indoor temperature to be 25 +/-2 ℃, controlling the coating viscosity to be 50-70S, controlling the leveling time to be 10-15 min, baking and shaping the leveled galvanized steel sheet through a curing oven, controlling the baking and curing temperature to be 210-224 ℃ and the baking time to be 35-45S, drying the surface of the galvanized steel sheet through circulating hot air in the drying process, cooling the galvanized steel sheet through cold air after drying, performing secondary cooling on the galvanized steel sheet through sprayed circulating cooling water, squeezing residual water stains on the surface of the galvanized steel sheet through a squeezing machine after the cooled strip steel reaches below 45 ℃, and drying the squeezed galvanized steel sheet through circulating hot air to obtain a dried galvanized steel sheet;
step six, printing: putting the dried galvanized steel sheet obtained in the fifth step into a 3D printing machine for surface printing, firstly coating ink on the surface of a printing roller, then driving the printing roller to rotate through a driving mechanism, transferring the ink on the printing roller to a rubber roller, and transferring the pattern on the surface of the printing roller to the front surface of the galvanized steel sheet through the rotation of the rubber roller, wherein the thickness of each layer of printing is controlled within 1-2 microns, so that the galvanized steel sheet with 3D printing patterns on the surface is obtained;
step seven, drying the printing ink: placing the galvanized steel sheet with the 3D printed patterns obtained in the sixth step in an ink drying box for drying at the drying temperature of 75-85 ℃ for 5-8 s, and drying by adopting circulating heat supply hot air in the drying process to obtain the printed galvanized steel sheet with the 3D printed patterns on the surface;
step eight, coating finish paint: coating finish paint on the front surface of the printed galvanized steel plate obtained in the step seven by using a roller coater, wherein the thickness of the finish paint is 10-15 um, so as to obtain the printed galvanized steel plate with the finish paint;
step nine, leveling and curing of the finish paint: placing the printed galvanized steel sheet obtained in the step eight into a closed and clean leveling machine with a certain air flow rate to level the printed galvanized steel sheet, controlling the indoor temperature to be 25 +/-2 ℃, controlling the viscosity of a coating to be 60-80S, controlling the leveling time to be 10-15 min, baking and shaping the leveled printed galvanized steel sheet through a curing oven, drying and curing the surface of the galvanized steel sheet at 224-232 ℃ for 35-45S, drying the surface of the galvanized steel sheet by using circulating heat supply hot air in the drying process, cooling the printed galvanized steel sheet by using cold air after drying, carrying out secondary cooling on the galvanized steel sheet by using sprayed circulating cooling water, squeezing residual water stains on the surface of the printed galvanized steel sheet by using a double-roller squeezer after the cooled steel strip reaches the temperature below 45 ℃, and drying the squeezed printed galvanized steel sheet by using hot air to obtain a dried printed galvanized steel sheet with finish paint;
step ten, film covering: covering a layer of polyvinyl chloride protective film on the surface of the printed galvanized steel plate with the finish paint obtained in the step nine, wherein the thickness of the protective film is 4-6 microns, so as to obtain the printed galvanized steel plate with the surface protective film;
step eleven, withdrawal and straightening: pulling and straightening the surface of the printed galvanized steel sheet coated with the film in the step ten by using a multi-roller straightening machine, wherein the pulling and straightening tension is 3500-4500 Kg, so as to obtain the printed galvanized steel sheet with a good plate shape;
step twelve, rolling finished products: and D, winding the printed galvanized steel sheet obtained in the step eleven into a winding machine, and slitting and packaging the printed galvanized steel sheet to obtain a finished product package with the 3D color-coated printed galvanized steel sheet.
The 3D printing machine related in the sixth step comprises a rack, a cleaning mechanism, a waste collecting box, a rubber roll, a transmission rod, a printing roll, a material box and a coating roll, wherein the center of the rack is sequentially and rotatably connected with the rubber roll, the printing roll and the coating roll from left to right, the rubber roll, the printing roll and the coating roll are mutually and rotatably connected, the material box is fixed between the racks below the printing roll and the coating roll, the bottom ends of the printing roll and the coating roll are arranged in the material box, the outer side of one end of the rubber roll is connected with a baffle, the center of the rack at the end, far away from the printing roll, of the rubber roll and the coating roll is rotatably connected with the transmission rod, the transmission rod is symmetrically arranged relative to the center line of the rack, the transmission rod is arranged below the rubber roll, the printing roll and the coating roll, the waste collecting box is fixed between the racks above the transmission rod at the end, far away from the printing roll, of the waste collecting box is attached to the outer side wall of the rubber roll, a screen plate is fixed at the center inside the waste collecting box, a liquid pump is fixed at the bottom end inside the waste collecting box below the screen plate, a fixed rod is fixed between the racks above the waste collecting box, a second contact wheel is fixed at one end of the top of the fixed rod, one end of the second contact wheel, which is far away from the fixed rod, is connected with a rubber roller at one side of a baffle in a rolling manner, a driving rod is hinged at the top of the second contact wheel, which is close to one end of the fixed rod, a chute is arranged at one end of the driving rod, which is far away from the second contact wheel, a first contact wheel is connected with the top of the fixed rod below the chute in a sliding manner, one end of the first contact wheel, which is above the fixed rod, is connected with the rubber roller at the other side of the baffle in a rolling manner, a brake rod is hinged at the top of the fixed rod, which is far away from one end of the second contact wheel, of the first contact wheel, and one end of the brake rod is hinged and fixed with the driving rod at one end of the chute, the other end of the brake rod is hinged with a push block, and a cleaning mechanism is connected between the machine frames above the rubber rollers at the end, far away from the fixed rod, of the push block in a sliding manner;
clearance mechanism includes fixed plate, cutter, whets a knife, the sponge that absorbs water and sprays the seat, and fixed plate sliding connection is between the frame, the sliding tray internal connection of fixed plate has reset spring, reset spring's one end and fixed plate fixed connection, and one side and the ejector pad conflict of fixed plate are connected, the corner that the fixed plate is close to ejector pad one end is fixed with through the support and is fixed with the cutter, and the cutter slope sets up in the top of rubber roll, and evenly is equipped with logical groove on the blade of cutter, the bottom of cutter one end fixed plate is fixed with through the support and whets a knife, whets a knife and the mutual parallel arrangement of rubber roll, and the bottom of whetting a knife keeping away from cutter one end fixed plate is fixed with and sprays the seat, and the input that sprays the seat is linked together through the output of pipeline with the drawing liquid pump, the sponge that absorbs water keeps away from the bottom of whetting a knife one end fixed plate and is connected with and sprays the seat and all hangs in the top of rubber roll along the direction of rotation of rubber roll.
Specifically, the cleaning agent in the second step is an alkaline cleaning agent, and fresh pure water is adopted as the circulating water.
Specifically, the plates are cleaned by the circulating water in the second step, and then recycled and filtered to be used as circulating cooling water in the fifth step and the ninth step.
Specifically, the texture of the embossing roller in the sixth step is one of wood grain, brick texture and marble texture.
Specifically, in the step eight, the finish paint is varnish.
Specifically, the coil weight of the finished coil-shaped galvanized steel sheet obtained in the step twelve is controlled to be 3-5 tons, and a paper sleeve with the thickness of 12mm needs to be added to an inner ring of the coil-shaped galvanized steel sheet during winding.
Specifically, the angle between the cutter and the axis of the glue roller is 15-45 degrees.
Specifically, the bottom end of the cutter is matched with the radian of the outer side wall of the rubber roller.
Specifically, the distance between the cutter, the sharpening blade and the water absorption sponge and the outer side wall of the rubber roller is 0-1 um.
Specifically, the through groove is obliquely arranged, and one end of the through groove, which is close to the waste collection box, is a lower end.
3. Advantageous effects
(1) According to the invention, the galvanized steel sheet is degreased, cleaned and passivated, and then painted and printed, so that the corrosion resistance of the surface of the sheet is effectively improved through the passivation film, the steel sheet is not only anticorrosive on a zinc layer, but also the surface of the steel sheet can be effectively covered by an organic coating, so that the oil coating is used as an additional protective film to carry out anticorrosive protection on the steel sheet, the antirust capacity of the sheet is effectively improved, the service life of the sheet is prolonged, and the service life of the sheet is about two times longer than that of the traditional galvanized steel sheet.
(2) According to the invention, the paint is cured after the primer, the back paint and the surface paint by adopting a leveling and curing mode, so that not only can solvent volatile gas on the surface of a wet paint workpiece be effectively volatilized within a certain time, but also the wet paint film can be effectively leveled, thus the flatness and the glossiness of the paint film are ensured, the paint spraying quality is improved, the stereoscopic impression of printed paint patterns can be effectively kept during printing, the decoration and the attractiveness of the plate are effectively improved, and the selectivity of the plate is improved.
(3) According to the invention, the 3D printing machine is adopted to print the 3D color pattern on the board, so that the attractiveness of the board can be effectively improved, meanwhile, the 3D printing machine can effectively cut and polish the oxide generated on the surface of the rubber roller through the cleaning mechanism in the printing process, the rubber roller can be effectively cleaned quantitatively according to the thickness of the oxide, the cleanness of the surface of the rubber roller is effectively ensured, the adhesiveness of the printing on the surface of the rubber roller is kept, the deinking phenomenon caused by an oxide film generated by oxidation after the surface of the rubber roller is contacted with the pigment is avoided, the phenomenon that the rubber roller needs to be disassembled, cleaned and polished in the traditional mode is avoided, the convenience in use and later maintenance of the device are improved, the manual operation is reduced, the practicability is good, meanwhile, the cleaned oxide and the cleaning water adopted during cleaning can be effectively separated, the concentrated cleaning of the oxide is convenient, the recycling of the cleaning water is convenient, the resources are effectively reduced, the pollution is reduced, and the environmental protection of the device is improved.
(4) According to the invention, the secondary film covering is carried out on the surface of the finish paint, the corrosion resistance of the printed surface plate is further improved through the outer protective film, and the defects of easy color and aging, layering and falling off and poor modeling of the traditional plate in the processes of film covering and pattern transfer are overcome, so that the processed plate has the advantages of difficult color fading, aging resistance, fire prevention, rain prevention and the like, and the applicability of the plate is effectively improved.
(5) The invention effectively ensures the integral flatness of the processed plate and the plate shape of the plate by adopting a pulling-straightening and rolling mode, thereby facilitating the subsequent deep processing of the plate, further improving the applicability of the plate and increasing the selection of the plate.
To sum up, the coating method of the 3D color-coated printed galvanized steel sheet provided by the invention can effectively improve the antirust capacity of the sheet, prolong the service life of the sheet, effectively ensure the flatness and glossiness of a paint film, improve the paint spraying quality, effectively perform 3D color-coating printing on the sheet through the 3D printing machine, effectively keep the stereoscopic impression of the printed paint pattern during printing, and improve the decoration and aesthetic property of the sheet, thereby improving the selection of the sheet, and simultaneously effectively quantitatively cutting and polishing the oxide on the surface of the rubber roll through a cleaning mechanism of the 3D printing machine, effectively ensuring the cleanliness of the surface of the rubber roll, keeping the adhesion of the printing on the surface of the rubber roll, avoiding the deinking phenomenon caused by an oxide film generated by oxidation after the surface of the rubber roll is contacted with pigment, further ensuring the aesthetic property of the printing, and effectively improving the applicability and selection of the sheet.
Drawings
FIG. 1 is a schematic side sectional view of a 3D printing machine of the present invention;
FIG. 2 is a schematic view of an assembled top view structure of the cleaning mechanism and the rubber roller of the present invention;
FIG. 3 is a schematic side sectional view of the cutter of the present invention.
Reference numerals are as follows: 1. a fixing plate; 2. a cutter; 3. a screen plate; 4. a waste collection tank; 5. a rubber roller; 6. a transmission stick; 7. sharpening the knife; 8. a water-absorbing sponge; 9. a spray seat; 10. a printing roller; 11. a material box; 12. coating a roller; 13. a through groove; 14. a fixing rod; 15. pushing a block; 16. a brake lever; 17. a chute; 18. a drive rod; 19. a liquid pump; 20. a first trolley; 21. a baffle plate; 22. a second trolley.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1
A coating method of a 3D color-coated printed galvanized steel plate comprises the following steps:
step one, uncoiling and feeding: placing the rolled galvanized steel sheet into an uncoiler for uncoiling;
step two, degreasing and cleaning: soaking the uncoiled galvanized steel sheet in a degreasing tank with a cleaning agent for roller brush degreasing, and then spraying and cleaning the galvanized steel sheet by using circulating water, wherein the cleaning agent is an alkaline cleaning agent, and the circulating water is fresh pure water and is dried by hot air to obtain a clean galvanized steel sheet;
step three, passivating and drying: putting the cleaned galvanized steel sheet obtained in the step two into a roller coater to roll coat the passivation film liquid on the front surface and the back surface of the galvanized steel sheet, so that a passivation film layer is formed on the front surface and the back surface of the galvanized steel sheet, wherein the thickness of the passivation film is 2 microns, then putting the galvanized steel sheet coated with the passivation film into a drying box to be dried, wherein the drying temperature is 75 ℃, the drying time is 10 seconds, and drying the galvanized steel sheet coated with the passivation film by using circulating hot air after the drying is finished, so as to obtain the galvanized steel sheet with the passivation film;
step four, coating a primer and a back paint: coating priming paint and back paint on the front side and the back side of the galvanized steel sheet with the passivation film obtained in the third step by using a roller coater, wherein the thickness of the priming paint and the thickness of the back paint are both 5 mu m, so as to obtain the galvanized steel sheet with the priming paint and the back paint;
step five, leveling and curing of the primer and the back paint: placing the galvanized steel sheet with the primer and the back paint obtained in the fourth step into a closed and clean leveling machine with a certain air flow rate to level the galvanized steel sheet, wherein the indoor temperature is 23 ℃, the coating viscosity is 50S, the leveling time is 10min, baking and shaping the leveled galvanized steel sheet through a curing oven, the baking and curing temperature is 210 ℃, the baking time is 35S, circulating hot air is adopted to blow the surface of the galvanized steel sheet in the baking process, the galvanized steel sheet is cooled through cold air after being dried, the galvanized steel sheet is secondarily cooled through sprayed circulating cooling water, after the temperature of the cooled strip steel reaches 42 ℃, residual water stains on the surface of the galvanized steel sheet are squeezed through a double-roller squeezer, and the squeezed galvanized steel sheet is dried through circulating hot air to obtain a dried galvanized steel sheet;
step six, printing: putting the dry galvanized steel sheet obtained in the fifth step into a 3D printing machine for surface printing, firstly coating ink on the surface of a printing roller, wherein the texture of the printing roller is wood grain, then driving the printing roller to rotate through a driving mechanism, transferring the ink on the printing roller onto a rubber roller, and transferring the pattern on the surface of the printing roller onto the front surface of the galvanized steel sheet through the rotation of the rubber roller, wherein the thickness of each layer of printing is 1um, so that the galvanized steel sheet with the 3D printing pattern on the surface is obtained;
step seven, drying the printing ink: placing the galvanized steel sheet with the 3D printed patterns obtained in the sixth step in an ink drying box for drying, wherein the drying temperature is 75 ℃, the drying time is 8s, and the galvanized steel sheet is dried by adopting circulating heat supply hot air in the drying process to obtain the printed galvanized steel sheet with the 3D printed patterns on the surface;
step eight, coating finish: coating finish paint on the front surface of the printed galvanized steel plate obtained in the step seven by using a roller coater, wherein the finish paint is varnish, and the thickness of the finish paint is 10 mu m, so that the printed galvanized steel plate with the finish paint is obtained;
step nine, leveling and curing of the finish paint: placing the printed galvanized steel sheet obtained in the step eight into a closed and clean leveling machine with a certain air flow rate to level the printed galvanized steel sheet, controlling the indoor temperature to be 23 ℃, controlling the viscosity of a coating to be 60S, setting the leveling time to be 10min, baking and shaping the leveled printed galvanized steel sheet through a curing oven, wherein the baking and curing temperature is 224 ℃, the baking and curing time is 35S, drying the surface of the galvanized steel sheet through circulating heat supply hot air in the baking process, cooling the printed galvanized steel sheet through cold air after drying, secondarily cooling the galvanized steel sheet through sprayed circulating cooling water, cleaning the sheet through the circulating water, recycling and filtering the sheet, squeezing residual water stains on the surface of the printed galvanized steel sheet through a double-roller squeezer after the cooled strip steel reaches 42 ℃, and drying the squeezed printed galvanized steel sheet through hot air to obtain the dried galvanized steel sheet with finish paint;
step ten, film covering: covering a layer of polyvinyl chloride protective film on the surface of the printed galvanized steel sheet with the finish paint obtained in the step nine, wherein the thickness of the protective film is 4 microns, and obtaining the printed galvanized steel sheet with the surface protective film;
step eleven, withdrawal and straightening: performing plate surface tension straightening on the printed galvanized steel plate coated with the film in the step ten by using a multi-roller straightening machine, wherein the tension of the tension is 3500Kg, so as to obtain a printed galvanized steel plate with a good plate shape;
step twelve, rolling finished products: and (4) winding the printed galvanized steel sheet obtained in the step eleven into a winding machine, cutting and packaging the printed galvanized steel sheet, and adding a paper sleeve with the thickness of 12mm into the inner ring of the rolled galvanized steel sheet during winding, so that the roll collapse phenomenon of the rolled galvanized steel sheet in the winding process is effectively avoided, and the 3D color-coated printed galvanized steel sheet with the finished roll weight of 3 tons is obtained.
Referring to fig. 1-3, the invention also provides a 3D printing machine, which comprises a frame, a cleaning mechanism, a waste collecting box 4, a rubber roller 5, a transmission roller 6, a printing roller 10, a bin 11 and a coating roller 12, wherein the center of the frame is sequentially and rotatably connected with the rubber roller 5, the printing roller 10 and the coating roller 12 from left to right, the rubber roller 5, the printing roller 10 and the coating roller 12 are all in rolling connection with each other, the bin 11 is fixed between the printing roller 10 and the frame below the coating roller 12, the bottom ends of the printing roller 10 and the coating roller 12 are all arranged inside the bin 11, the outer side of one end of the rubber roller 5 is connected with a baffle 21, the center of the frame at one ends of the rubber roller 5 and the coating roller 12 far away from the printing roller 10 is rotatably connected with the transmission roller 6, the transmission rollers 6 are symmetrically arranged with respect to the center line of the frame, the transmission rollers 6 are all arranged below the rubber roller 5, the printing roller 10 and the coating roller 12, the waste collecting box 4 is fixed between the frame at the upper portion of the transmission roller 6 at one end of the rubber roller 5 far away from the printing roller 10, one end of the waste collection box 4 is attached to the outer side wall of the rubber roller 5, a screen plate 3 is fixed in the center of the interior of the waste collection box 4, a liquid pump 19 is fixed at the bottom end of the interior of the waste collection box 4 below the screen plate 3, a fixing rod 14 is fixed between the racks above the waste collection box 4, a second contact wheel 22 is fixed at one end of the top of the fixing rod 14, one end of the second contact wheel 22, which is far away from the fixing rod 14, is connected with the rubber roller 5 on one side of the baffle 21 in a rolling manner, a driving rod 18 is hinged to the top of the second contact wheel 22, which is close to one end of the fixing rod 14, a sliding groove 17 is arranged at one end of the driving rod 18, which is far away from the second contact wheel 22, a first contact wheel 20 is connected with the top of the fixing rod 14 below the sliding groove 17 in a sliding manner, one end of the first contact wheel 20, which is far away from the fixing rod 14, is connected with the rubber roller 5 on the other side of the baffle 21 in a rolling manner, the top of the fixed rod 14 at one end, far away from the second trolley 22, of the first trolley 20 is hinged with a brake rod 16, one end of the brake rod 16 is hinged and fixed with a drive rod 18 at one end of the chute 17, the other end of the brake rod 16 is hinged with a push block 15, and a cleaning mechanism is connected between the frames above rubber rollers 5 at one end, far away from the fixed rod 14, of the push block 15 in a sliding mode;
the cleaning mechanism comprises a fixed plate 1, a cutter 2, a knife sharpener 7, a water absorption sponge 8 and a spraying seat 9, the fixed plate 1 is connected between the racks in a sliding mode, a reset spring is connected inside a sliding groove of the fixed plate 1, one end of the reset spring is fixedly connected with the fixed plate 1, one side of the fixed plate 1 is connected with a push block 15 in an abutting mode, the cutter 2 is fixed at a corner, close to one end of the push block 15, of the fixed plate 1 through a support, the cutter 2 is obliquely arranged above the rubber roller 5, the angle between the cutter 2 and the axis of the rubber roller 5 is 30 degrees, the bottom end of the cutter 2 is matched with the outer side wall radian of the rubber roller 5, the cutter 2 is conveniently and fully attached to the outer side of the rubber roller 5, oxides generated on the surface of the rubber roller 5 can be conveniently scraped, the cleanliness of the surface of the rubber roller 5 is effectively guaranteed, the adhesiveness of a printing on the surface of the rubber roller 5 is effectively guaranteed, and the device can be used for 3D printing, and the blade of the cutter 2 is uniformly provided with a through groove 13, the through groove 13 is obliquely arranged, one end of the through groove 13 close to the waste collection box 4 is a lower end, liquid impurities generated by cleaning are guided into the waste collection box 4 through the obliquely arranged through groove 13, oxides and polished waste materials are collected conveniently, the device is convenient to use, a knife 7 is fixed at the bottom end of a fixing plate 1 at one end of the cutter 2 through a support, the knife 7 and the rubber roller 5 are arranged in parallel, a spray seat 9 is fixed at the bottom of the fixing plate 1 at one end of the knife 7 far away from the cutter 2, the input end of the spray seat 9 is communicated with the output end of a liquid suction pump 19 through a pipeline, the bottom of the fixing plate 1 at one end of the water absorption sponge 8 far away from the knife 7 is connected with the spray seat 9, and the cutter 2, the knife 7, the water absorption sponge 8 and the spray seat 9 are all suspended above the rubber roller 5 along the rotating direction of the rubber roller 5, cutter 2, the interval is 1um between 7 and the sponge 8 and the 5 lateral walls of rubber roll of whetting a knife, be convenient for first feeler wheel 20 and the second feeler wheel 22 between produce thickness difference, thereby 16 promotion ejector pad 15 of actuating lever linkage brake lever drive fixed plate 1 produce equivalent displacement, thereby make cutter 2, 7 and the sponge 8 that absorbs a knife all produce equivalent displacement, and then effectively get rid of the oxide that the rubber roll 5 surface produced, the cleanliness factor on rubber roll 5 surface has been guaranteed, be convenient for keep the adhesion on rubber roll 5 surface of stamp, avoid the deinking phenomenon that the oxidation film that 5 surfaces of rubber roll and pigment contacted the back oxidation generated caused, 3D calico printing machine has been guaranteed and has evenly printed, be convenient for the device to carry out 3D stamp and use.
The working principle is as follows: when in use, firstly, the galvanized steel sheet to be printed is pushed to the printing roller 10 through the transmission roller 6, the printing roller 10 and the coating roller 12 are controlled to rotate, so that the coating roller 12 uniformly coats the ink in the bin 11 on the surface of the printing roller 10, the ink is transferred from the surface of the printing roller 10 to the surface of the rubber roller 5 along with the rotation of the printing roller 10, the ink pattern on the surface of the printing roller is transferred to the front surface of the galvanized steel sheet along with the rotation of the rubber roller 5, the 3D printing processing of the surface of the galvanized steel sheet is completed, the rubber roller 5 after printing continuously rotates until the printing roller is contacted with the printing roller 10 again and then transfers the ink pattern, when the rubber roller 5 continuously transfers the printing process, after oxides are generated due to the continuous contact of the surface layer of the rubber roller 5 with pigments and the ink, a certain thickness difference is generated between the first contact wheel 20 and the second contact wheel 22 on both sides of the baffle 21 and the rubber roller 5, the first trolley 20 enables the driving rod 18 to rotate under the action of an oxide, and further enables the driving rod 18 to be linked with the brake rod 16 to push the push block 15 and drive the fixing plate 1 to generate equivalent displacement when the driving rod 18 rotates, so that the cutter 2, the knife 7 and the water absorption sponge 8 all generate equivalent displacement, the cutter 2 is enabled to effectively cut off the oxide generated on the surface of the rubber roller 5, at the moment, the liquid pump 19 pumps cleaning water inside the waste collecting box 4 below the screen plate 3 into the spraying seat 9 to spray out, the surface of the rubber roller 5 is effectively washed and polished through the knife 7, the polished surface of the rubber roller 5 transfers and prints ink patterns after adsorbing residual water drops through the water absorption sponge 8, a cleaning mechanism is effectively convenient to cut and polish the rubber roller according to the thickness of the oxide, the cleanliness of the surface of the rubber roller 5 is ensured, meanwhile, the waste materials after cutting and polishing are effectively separated, and the cleaning water after water washing and polishing is effectively filtered and reused, reduce the resource consumption of device, can not only effectively clear up 5 surfaces of rubber roll automatically, keep the stamp at the adhesiveness on 5 surfaces of rubber roll, avoid 5 surfaces of rubber roll and the deinking phenomenon that the oxidation film that the pigment contacted back oxidation generated caused, the device of being convenient for evenly stamps, can also effectively reduce the resource consumption of device, avoided traditional mode to need dismantle the phenomenon of wasing the rubber roll 5 and polishing, the convenience of device use and later maintenance has been improved, manual operation has been reduced, the practicality is good.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.

Claims (10)

1. A coating method of a 3D color-coated printed galvanized steel plate is characterized by comprising the following steps:
step one, uncoiling and feeding: placing the rolled galvanized steel sheet into an uncoiler for uncoiling;
step two, degreasing and cleaning: soaking the uncoiled galvanized steel sheet in a degreasing tank with a cleaning agent to perform roller brush degreasing, then spraying and cleaning the galvanized steel sheet by using circulating water, and drying by using hot air to obtain a clean galvanized steel sheet;
step three, passivating and drying: putting the cleaned galvanized steel sheet in the step two into a roller coater, and performing roller coating of a passivation film solution on the front surface and the back surface of the galvanized steel sheet to form a layer of passivation film on the front surface and the back surface of the galvanized steel sheet, wherein the thickness of the passivation film is 2-3 mu m, then putting the galvanized steel sheet coated with the passivation film into a drying box, drying the galvanized steel sheet at the drying temperature of 75-85 ℃ for 8-15 s, and obtaining the galvanized steel sheet with the passivation film after drying;
step four, coating a primer and a back paint: coating priming paint and back paint on the front surface and the back surface of the galvanized steel sheet with the passive film obtained in the third step by a roller coater, wherein the thickness of the priming paint and the thickness of the back paint are both 5-7 mu m, so as to obtain the galvanized steel sheet with the priming paint and the back paint;
step five, leveling and curing of the primer and the back paint: placing the galvanized steel sheet with the primer and the back paint obtained in the fourth step into a closed and clean leveling machine with a certain air flow rate to level the galvanized steel sheet, controlling the indoor temperature to be 25 +/-2 ℃, controlling the coating viscosity to be 50-70S, controlling the leveling time to be 10-15 min, baking and shaping the leveled galvanized steel sheet through a curing oven, controlling the baking and curing temperature to be 210-224 ℃ and the baking time to be 35-45S, drying the surface of the galvanized steel sheet through circulating hot air in the drying process, cooling the galvanized steel sheet through cold air after drying, performing secondary cooling on the galvanized steel sheet through sprayed circulating cooling water, squeezing residual water stains on the surface of the galvanized steel sheet through a squeezing machine after the cooled strip steel reaches below 45 ℃, and drying the squeezed galvanized steel sheet through circulating hot air to obtain a dried galvanized steel sheet;
step six, printing: putting the dried galvanized steel sheet obtained in the fifth step into a 3D printing machine for surface printing, firstly coating ink on the surface of a printing roller, then driving the printing roller to rotate through a driving mechanism, transferring the ink on the printing roller to a rubber roller, and transferring the pattern on the surface of the printing roller to the front surface of the galvanized steel sheet through the rotation of the rubber roller, wherein the thickness of each layer of printing is controlled within 1-2 mu m, so that the galvanized steel sheet with 3D printing patterns on the surface is obtained;
step seven, drying the printing ink: placing the galvanized steel sheet with the 3D printed patterns obtained in the sixth step in an ink drying box for drying at the drying temperature of 75-85 ℃ for 5-8 s, and drying by adopting circulating heat supply hot air in the drying process to obtain the printed galvanized steel sheet with the 3D printed patterns on the surface;
step eight, coating finish paint: coating finish paint on the front surface of the printed galvanized steel plate obtained in the step seven by using a roller coater, wherein the thickness of the finish paint is 10-15 mu m, so as to obtain the printed galvanized steel plate with the finish paint;
step nine, leveling and curing of the finish paint: placing the printed galvanized steel sheet obtained in the step eight into a closed and clean leveling machine with a certain air flow rate to level the printed galvanized steel sheet, controlling the indoor temperature to be 25 +/-2 ℃, controlling the paint viscosity to be 60-80S, controlling the leveling time to be 10-15 min, baking and shaping the leveled printed galvanized steel sheet through a curing oven, drying and curing the surface of the galvanized steel sheet at 224-232 ℃ for 35-45S, drying the surface of the galvanized steel sheet by using circulating heat supply hot air in the drying process, cooling the printed galvanized steel sheet by using cold air after drying, performing secondary cooling on the galvanized steel sheet by using sprayed circulating cooling water, squeezing residual water stains on the surface of the printed galvanized steel sheet by using a double-roller squeezer after the cooled steel strip reaches the temperature of below 45 ℃, and drying the squeezed printed galvanized steel sheet by using hot air to obtain a dried printed galvanized steel sheet with finish paint;
step ten, film covering: covering a layer of polyvinyl chloride protective film on the surface of the printed galvanized steel sheet with the finish paint obtained in the step nine, wherein the thickness of the protective film is 4-6 mu m, and obtaining the printed galvanized steel sheet with the surface protective film;
step eleven, withdrawal and straightening: pulling and straightening the surface of the printed galvanized steel sheet coated with the film in the step ten by using a multi-roller straightening machine, wherein the pulling and straightening tension is 3500-4500 Kg, so as to obtain the printed galvanized steel sheet with a good plate shape;
step twelve, winding finished products: rolling the printed galvanized steel sheet obtained in the step eleven into a rolling machine, and cutting and packaging the printed galvanized steel sheet to obtain a finished rolled galvanized steel sheet with 3D color printing;
the 3D printing machine comprises a frame, a cleaning mechanism, a waste collecting box (4), a rubber roll (5), a transmission roller (6), a printing roller (10), a bin (11) and a coating roller (12), wherein the center of the frame is sequentially and rotatably connected with the rubber roll (5), the printing roller (10) and the coating roller (12) from left to right, the rubber roll (5), the printing roller (10) and the coating roller (12) are all in rolling connection with each other, the bin (11) is fixed between the frame below the printing roller (10) and the coating roller (12), the bottoms of the printing roller (10) and the coating roller (12) are all arranged inside the bin (11), the outer side of one end of the rubber roll (5) is connected with a baffle (21), the center of the frame, far away from one end of the printing roller (10), of the rubber roll (5) and the coating roller (12) is connected with the transmission roller (6) in a rotating manner, the transmission roller (6) is symmetrically arranged about the center line of the frame, the transmission roller (6) is arranged below the printing roller (10) and the waste collecting box (4) and the waste collecting box (5) is fixed above the screen (4), and the rubber roll (5) is fixed on the outer side of the frame, a liquid pump (19) is fixed at the bottom end inside the waste collection box (4) below the screen plate (3), a fixing rod (14) is fixed between the racks above the waste collection box (4), a second contact wheel (22) is fixed at one end of the top of the fixing rod (14), one end, far away from the fixing rod (14), of the second contact wheel (22) is in rolling connection with the rubber roller (5) on one side of the baffle (21), a driving rod (18) is hinged to the top, close to one end of the fixing rod (14), of the second contact wheel (22), a sliding groove (17) is formed in one end, far away from the second contact wheel (22), of the driving rod (18), a first contact wheel (20) is in sliding connection with the top of the fixing rod (14) below the sliding groove (17), one end, far away from the fixing rod (14), of the first contact wheel (20) is in sliding connection with the sliding groove (17), one end, far away from the fixing rod (14), of the first contact wheel (20) is in rolling connection with the rubber roller (5) on the other side of the baffle (21), one end, far away from the second contact wheel (22), a brake rod (16), and a brake rod (16) is hinged to a brake rod (16), and a push block (16) is hinged to the other end of the sliding groove (16), a cleaning mechanism is connected between the frames above the rubber rollers (5) at one end of the push block (15) far away from the fixed rod (14) in a sliding manner;
the cleaning mechanism comprises a fixed plate (1), a cutter (2), a sharpening (7), a water absorbing sponge (8) and a spraying seat (9), the fixed plate (1) is connected between the racks in a sliding way, a reset spring is connected inside a sliding groove of the fixed plate (1), one end of the reset spring is fixedly connected with the fixed plate (1), one side of the fixed plate (1) is connected with a push block (15) in an abutting way, the cutter (2) is fixed at a corner of the fixed plate (1) close to one end of the push block (15) through a bracket, the cutter (2) is obliquely arranged above the rubber roller (5), and a through groove (13) is uniformly arranged on a blade of the cutter (2), the bottom of cutter (2) one end fixed plate (1) is fixed with through the support and whets a knife (7), whets a knife (7) and rubber roll (5) parallel arrangement each other, and whets a knife (7) and keep away from the bottom of cutter (2) one end fixed plate (1) and be fixed with and spray seat (9), the input that sprays seat (9) is linked together through the output of pipeline with drawing liquid pump (19), the bottom that whets a knife (7) one end fixed plate (1) is kept away from in sponge (8) that absorbs water is connected with and sprays seat (9), and cutter (2), whet a knife (7), sponge (8) that absorbs water and the rotation direction that sprays seat (9) and all follow rubber roll (5) hang in the rotation direction of rubber roll (5) And (4) upward.
2. The coating method of the 3D color-coated printed galvanized steel sheet according to claim 1, wherein the cleaning agent in the second step is an alkaline cleaning agent, and fresh pure water is adopted as circulating water.
3. The coating method of the 3D color-coated printed galvanized steel sheet according to claim 2, characterized in that the circulating water in the second step is recycled and filtered after cleaning the sheet, and then is used as circulating cooling water in the fifth step and the ninth step.
4. The coating method of the 3D color-coated printed galvanized steel sheet as claimed in claim 1, wherein the texture of the printing roller in the sixth step is one of wood grain, brick texture and marble texture.
5. The coating method of the 3D color-coated printed galvanized steel sheet according to claim 1, wherein the finish paint is varnish in the step eight.
6. The method for coating a 3D color-coated printed galvanized steel sheet according to claim 1, wherein the coil weight of the finished coil-shaped galvanized steel sheet obtained in the step twelve is controlled to be 3 to 5 tons, and a paper sleeve with the thickness of 12mm needs to be added to the inner ring of the coil-shaped galvanized steel sheet during winding.
7. The coating method of the 3D color-coated printed galvanized steel sheet according to claim 1, wherein the angle between the cutting knife (2) and the axis of the rubber roller (5) of the 3D printing machine involved in the sixth step is 15-45 degrees.
8. The coating method of the 3D color-coated printed galvanized steel sheet according to claim 7, wherein the bottom end of the cutter (2) is matched with the radian of the outer side wall of the rubber roller (5).
9. The coating method of the 3D color-coated printed galvanized steel sheet according to claim 8, wherein the distances between the cutter (2), the knife grinder (7), the water absorption sponge (8) and the outer side wall of the rubber roll (5) are all 0-1 μm.
10. The coating method of the 3D color-coated printed galvanized steel plate as claimed in claim 1, wherein in the step six, the through groove (13) is obliquely arranged, and one end of the through groove (13) close to the scrap collecting box (4) is a lower end.
CN201910862361.XA 2019-09-12 2019-09-12 Coating method of 3D color-coated printed galvanized steel plate Active CN110523605B (en)

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