A method of can body print ink curing

Abstract

The application discloses a kind of tank printing ink curing method, comprising the following steps: S1, printing tank fixed;S2, printing tank rotation;S3, ink spraying, by the color jet head and varnish jet head of printing trolley bottom spray drawing ink, ink spray is drawn on the surface of printing tank;S4, ink curing irradiation, curing lamp group subarea control irradiation, the surface of printing tank is irradiated and cured to spray drawing ink;S5, printing tank ink curing is completed, printing trolley moves along the direction of printing tank busbar, so that the rest of the surface of printing tank is sprayed with ink, printing tank rotates, so that the surface of curing lamp group is irradiated and cured to spray drawing ink, until printing tank surface printing ink is all cured;Compared with the existing curing lamp bead integral control irradiation, the varnish jet head of the present application is sprayed with varnish by curing lamp group subarea irradiation design, and the brightness of tank surface varnish curing is realized.

Description

Technical Field

[0001] This invention relates to the field of tank coloring equipment, and in particular to a method for curing printing ink on tanks. Background Technology

[0002] In the inkjet printing process on the surface of cans, the curing effect of the varnish directly affects the appearance quality and weather resistance of the coating. Existing curing methods have the problem of insufficient leveling due to synchronous curing. Traditional curing lamps are linked with the printhead for control. The varnish is sprayed and then immediately irradiated, without allowing time for leveling. This results in uneven surface tension of the varnish, producing defects such as pinholes and orange peel texture, which affect the gloss of the coating on the surface of the can.

[0003] Therefore, in order to solve the above problems, a method for curing ink printed on a can is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a method for curing ink for printing on a can, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for curing printing ink in a can, comprising the following steps:

[0006] S1, Printing tank fixed, the printing tank is fixed to the top of the printing station by one end of the clamping rotating component;

[0007] S2, The printing can rotates by the other end of the clamping and rotating assembly;

[0008] S3, Ink spraying: Ink is sprayed through the color printhead and varnish printhead set at the bottom of the printing carriage, and the ink is sprayed onto the surface of the printing can;

[0009] S4, Ink curing irradiation, is achieved by irradiating and curing the ink sprayed on the surface of the printing can by irradiating and curing the ink by setting curing lamps at the top of the printing station and at the bottom or side of the printing can.

[0010] S5, the ink on the printing can is cured. The printing carriage moves in a straight line along the generatrix of the printing can, so that the remaining surface of the printing can is sprayed with ink. The printing can rotates, so that the ink sprayed on its surface is irradiated and cured by the curing lamps until all the ink on the surface of the printing can is cured.

[0011] Preferably, the clamping and rotating assembly in S1 and S2 includes a clamping rotating spindle and a clamping tailstock. The clamping rotating spindle and the clamping tailstock are located at the top of the printing station. The clamping rotating spindle and the clamping tailstock are used to clamp and fix the printing can. A can rotation motor is provided on the side of the clamping rotating spindle away from the printing can, and the can rotation motor is used to drive the printing can to rotate.

[0012] Preferably, the ink spraying in S3 includes the following steps:

[0013] S301, pattern printing, color printhead performs inkjet printing, and with the rotation of the printing can, the printing section surface of the printing can is sprayed with a color pattern.

[0014] S302, varnish spraying: The carriage drive motor drives the printing carriage to move, and the color printhead and varnish printhead move synchronously. The color printhead repeats the process of S301 on the remaining unsprayed parts of the printing can. The varnish printhead sprays varnish on the parts of the printing can after the color pattern has been sprayed in step S301. The rotation of the printing can sprays varnish onto the surface of the color pattern on the outer wall of the printing can.

[0015] Preferably, the partition control process in S4 includes the following steps:

[0016] S401, Irradiation zone division: The substrate of the curing lamp group is divided into multiple lamp bead sections controlled by independent switches. The width of each section ranges from 2 to 30 mm. Each section is individually controlled by a PLC program controller.

[0017] S402, dynamic partition triggering: when the varnish printhead covers the printed area, the PLC program controller turns off the LED segment of that area. After the varnish is leveled, the PLC program controller turns on the LEDs of that area. When there is no varnish covering the area, the PLC program controller controls the LEDs of that area to stay on, so as to cure the inkjet pattern of the color printhead.

[0018] S403, a fixed mode switch, can be set via PLC program controller to have a full LED constant light mode and a dynamic zone mode.

[0019] Preferably, the width of the LED bead section in S401 is adjusted in the following way:

[0020] The LEDs on the curing lamp assembly substrate are connected in parallel circuits, and each LED segment corresponds to an independent drive circuit. The power supply of the LED segment is controlled by a PLC program controller.

[0021] The width of the LED segment can be programmed to be 2mm, 10mm, 20mm or 30mm, with the default width being 20mm.

[0022] Preferably, the all-LED-bead constant-on mode means that when the varnish is applied, all LED beads remain constantly lit to irradiate the surface of the printing can. After the varnish has cured, the printing can exhibits a matte effect because the varnish has not had enough time to spread.

[0023] Preferably, the dynamic zoning mode is as follows: when the varnish application begins, the varnish nozzle is turned off to spray the lamps in the corresponding lamp bead section, while the lamps in the other lamp bead sections are turned on at full power. After the varnish leveling of the corresponding lamp bead section is completed, the lamps in that lamp bead section are turned on for irradiation. After the varnish is cured, the printed can exhibits a high-gloss effect.

[0024] Preferably, the PLC programmable controller performs control using the following steps:

[0025] First, the mode is determined. In the mode of all LED beads being constantly lit, the PLC program controller controls all the lamp groups to be lit. In the dynamic partition mode, when the printing carriage moves, a photoelectric trigger switch is set on the main beam of the printing carriage. The photoelectric trigger switch corresponds to the position of the curing lamp group. The photoelectric trigger switch is used to detect the straight distance L between it and the varnish nozzle.

[0026] Second, the PLC program controller determines that the photoelectric trigger switch's triggering eye will transmit the distance L data to the PLC program controller, and the PLC program controller will perform the opening and closing control of the lamp bead section.

[0027] Third, lighting control: Each group of LED beads in the curing lamp assembly corresponds to a control contact of the PLC program controller. The initial state of the curing lamp assembly is an illuminated state. During the movement of the varnish nozzle, the PLC program controller controls the curing lamp assembly according to the distance L, turning off the LED beads corresponding to the bottom of the varnish nozzle position. When the varnish nozzle leaves the area, those LED beads turn on to irradiate and cure the varnish. Preferably, a lead screw is provided at the end of the vehicle body drive motor. The rotation of the lead screw drives the movement of the color nozzle and the varnish nozzle through threaded engagement.

[0028] The technical effects and advantages of this invention are as follows:

[0029] This invention features a curing lamp assembly at the top of the printing station. As the color printhead and varnish printhead print ink onto the printing can, the curing lamp assembly irradiates the varnish sprayed by the varnish printhead in sections, allowing the varnish time to level. After the printing carriage moves, the curing lamps at the rear sections are turned on to cure the varnish, ultimately forming a glossy varnish surface on the workpiece. Compared to existing methods that integrate curing lamps and simultaneously irradiate and cure the ink on the printing can surface, this method achieves a glossy finish on the can surface through the sectioned irradiation design of the curing lamp assembly. Attached Figure Description

[0030] Figure 1This is one of the overall structural schematic diagrams of the present invention.

[0031] Figure 2 The second schematic diagram shows the overall structure of the present invention.

[0032] Figure 3 This is a top view of the clamping and rotating assembly of the present invention.

[0033] Figure 4 This is a top view of the curing lamp assembly of the present invention.

[0034] In the diagram: 1. Printing station; 2. Printing carriage; 201. Color printhead; 202. Varnish printhead; 203. Carriage drive motor; 3. Clamping rotation assembly; 301. Fixture rotation spindle; 302. Fixture tailstock; 303. Can rotation motor; 4. Printing can; 5. Curing lamp assembly; 6. Photoelectric trigger switch. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] This invention provides, for example Figures 1-4 The method for curing printing ink on a can, as shown, includes the following steps:

[0037] S1, the printing tank 4 is fixed, and the printing tank 4 is fixed to the top of the printing station 1 by one end of the clamping rotating assembly 3;

[0038] S2, the printing can 4 rotates by the other end of the clamping rotation assembly 3;

[0039] It should be noted that the clamping and rotating assembly 3 in S1 and S2 includes a clamping rotating spindle 301 and a clamping tailstock 302. The clamping rotating spindle 301 and the clamping tailstock 302 are located at the top of the printing station 1. The clamping rotating spindle 301 and the clamping tailstock 302 are used to clamp and fix the printing can 4. A can rotation motor 303 is provided on the side of the clamping rotating spindle 301 away from the printing can 4. The can rotation motor 303 is used to drive the printing can 4 to rotate.

[0040] Specifically, the clamp tailstock 302 is pushed by the cylinder on its side to clamp the printing can 4 on the opposite side of the clamp rotating spindle 301 and the clamp tailstock 302. The output end of the can rotation motor 303 is welded and fixed to the rotating shaft end of the clamp rotating spindle 301. The rotation of the can rotation motor 303 drives the printing can 4 to rotate.

[0041] S3, Ink spraying: Ink is sprayed through the color nozzle 201 and varnish nozzle 202 set at the bottom of the printing carriage 2, and the ink is sprayed onto the surface of the printing tank 4.

[0042] S4, Ink curing irradiation, is controlled by the curing lamp group 5 set at the top of the printing station 1 and located at the bottom or side of the printing tank 4 to irradiate and cure the ink sprayed on the surface of the printing tank 4.

[0043] It should be noted that the color printhead 201 is located on one side of the varnish printhead 202 at the front end of the printing carriage 2. After the printing of the can body 4, it is usually necessary to spray another layer of protective varnish on the surface of the pattern sprayed by the color printhead 201. Because the ink sprayed by the printhead onto the surface of the can body during digital printing is in the form of dots, if it is cured immediately, the final appearance of the varnish will be dotted and without gloss.

[0044] Specifically, the solidified light group 5 is an LED light group;

[0045] Ink spraying in S3 includes the following steps:

[0046] S301, Pattern printing, color printhead 201 performs inkjet printing, and with the rotation of the printing tank 4, the surface of the printing section of the printing tank 4 is sprayed with a color pattern.

[0047] S302, varnish spraying: The vehicle drive motor 203 drives the printing carriage 2 to move. The color nozzle 201 and the varnish nozzle 202 move synchronously. The color nozzle 201 repeats the process of S301 on the remaining unsprayed parts of the printing can 4. The varnish nozzle 202 sprays varnish on the parts of the printing can 4 after the color pattern has been sprayed in step S301. The varnish is sprayed and covered on the surface of the color pattern on the outer wall of the printing can 4 by the rotation of the printing can 4.

[0048] It should be noted that a lead screw is provided at the end of the vehicle body drive motor 203. The rotation of the lead screw drives the movement of the color nozzle 201 and the varnish nozzle 202 through the threaded engagement.

[0049] S5, the ink in the printing can 4 has been cured. The printing carriage 2 moves in a straight line along the generatrix of the printing can 4, so that the remaining surface of the printing can 4 is sprayed with ink. The printing can 4 rotates, so that the ink sprayed on the surface of the curing lamp group 5 is irradiated and cured until all the ink on the surface of the printing can 4 is cured.

[0050] The partition control process in S4 includes the following steps:

[0051] S401, Irradiation zone division: The substrate of the curing lamp group 5 is divided into multiple lamp bead sections controlled by independent switches. The width of each section ranges from 2 to 30 mm. Each section is individually controlled by a PLC program controller.

[0052] S402, triggering dynamic partitioning: when the varnish printhead 202 covers the printed area, the PLC program controller turns off the LED bead section of that area. After the varnish is leveled, the PLC program controller turns on the LED bead of that area. When there is no varnish covering the area, the PLC program controller controls the LED of that area to stay on, so as to cure the inkjet pattern of the color printhead 201.

[0053] S403, a fixed mode switch, can be set via PLC program controller to have a full LED constant light mode and a dynamic zone mode.

[0054] It should be noted that the width of the LED segment in S401 is adjusted in the following way:

[0055] The LEDs on the substrate of the curing lamp group 5 are connected in parallel circuits, and each LED segment corresponds to an independent drive circuit. The power supply of the LED segment is controlled by a PLC program controller.

[0056] The width of the LED segment can be programmed to be 2mm, 10mm, 20mm or 30mm, with the default width being 20mm;

[0057] Specifically, the width of the LED bead section needs to be adjusted according to the spraying width requirements of the color nozzle 201 and the varnish nozzle 202;

[0058] The all-LED-bead constant-on mode means that when the varnish is applied, all LED beads remain constantly lit to irradiate the surface of the printing can 4. After the varnish is cured, the printing can 4 has a matte finish because the varnish does not have enough time to spread.

[0059] The dynamic zoning mode is as follows: when the varnish is applied, the varnish nozzle 202 is turned off to spray the corresponding LED bead section, and the LED beads in the other LED bead sections are turned on at full power. After the varnish leveling of the corresponding LED bead section is completed, the LED beads in the corresponding LED bead section are turned on for irradiation. After the varnish is cured, the printed can 4 presents a high gloss effect.

[0060] It should be noted that the matte and high-gloss finishes can be flexibly adjusted according to the producer's needs;

[0061] Specifically, the PLC programmable controller uses the following steps for control:

[0062] First, the mode is determined. In the mode of all LED beads being constantly lit, the PLC program controller controls all the lamp groups to be lit. In the dynamic partition mode, when the printing carriage 2 moves, a photoelectric trigger switch 6 is set on the main beam of the printing carriage 2. The photoelectric trigger switch 6 corresponds to the position of the curing lamp group 5. The photoelectric trigger switch 6 is used to detect the straight distance L between it and the varnish nozzle 202.

[0063] Second, the PLC program controller determines that the photoelectric trigger switch 6 will transmit the distance L data to the PLC program controller, and the PLC program controller will control the opening and closing of the lamp bead section.

[0064] Third, lighting control. Each group of LED beads in the curing lamp group 5 corresponds to the control contact of the PLC program controller. The initial state of the curing lamp group 5 is the illuminated state. During the movement of the varnish nozzle 202, the PLC program controller controls the curing lamp group 5 according to the distance L, turning off the LED beads corresponding to the bottom of the varnish nozzle 202. When the varnish nozzle 202 leaves the area, the LED beads are turned on to be irradiated and cured with varnish.

[0065] It should be noted that the position of the photoelectric trigger switch 6 is fixed, while the printing carriage 2 is movable. It is controlled by measuring the distance L between itself and the varnish nozzle 202 in the printing carriage 2. Each value of L corresponds to a group of LED beads in the curing lamp group 5. This group of LED beads is located at the bottom of the varnish nozzle 202. After reaching a distance L, the PLC program controller controls the opening and closing of the corresponding part of the lamp group. The moving speed of the LED light-off area of ​​the lamp group is synchronized with the moving speed of the printing carriage 2. The closing width of the LED bead group is greater than the width of the varnish nozzle 202.

[0066] Specifically, the control of the curing lamp group 5 is not limited to PLC or other control principles. Ultimately, the curing lamp group 5 in the area corresponding to the varnish nozzle is turned off to achieve the flow of varnish, resulting in a bright effect without affecting the entire printing process. The LED lamp control method in this case is not limited to varnish printing but can also be used for ink supply, primer or other ink processes that require flow.

[0067] In practical use, this invention uses a curing lamp group 5 installed at the top of the printing station 1. As the color printhead 201 and the varnish printhead 202 print ink onto the printing can 4, the curing lamp group 5 is powered off after detecting the varnish printhead 202 in different sections. After the varnish has leveled out, the lamps are turned on again to irradiate the curing varnish as the printing carriage 2 moves, resulting in a glossy varnish surface on the workpiece. Compared with existing curing lamp control that simultaneously irradiates and cures the ink on the surface of the printing can 4, this method achieves a glossy finish on the surface of the can through the partitioned irradiation design of the curing lamp group 5.

[0068] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method of curing a can printing ink, characterized by, It comprises the following steps: S1, the printing tank body (4) is fixed, and the printing tank body (4) is fixed on the top of the printing station (1) by clamping one end of the rotating assembly (3); S2, the rotation of the printing tank body (4), the other end of the rotating assembly (3) drives the printing tank body (4) to rotate; S3, the spraying of the ink, the color jet head (201) and the varnish jet head (202) provided on the bottom of the printing trolley (2) are used for spraying ink, and the ink is sprayed on the surface of the printing tank body (4); the ink spraying in S3 comprises the following steps: S301, the spraying of the pattern, the color jet head (201) sprays ink, and the rotation of the printing tank body (4) enables the surface of the printing tank body (4) to be sprayed with a color pattern; S302, the spraying of the varnish, the vehicle body driving motor (203) drives the printing trolley (2) to move, the color jet head (201) and the varnish jet head (202) move synchronously, the color jet head (201) repeatedly performs the process of S301 on the remaining part of the printing tank body (4) which has not been sprayed, the varnish jet head (202) sprays varnish on the part of the printing tank body (4) on which the color pattern has been sprayed in the step S301, and the varnish is sprayed on the color pattern surface of the outer wall of the printing tank body (4) through the rotation of the printing tank body (4); S4, the curing irradiation of the ink, the curing lamp group (5) provided on the top of the printing station (1) and located at the bottom or side of the printing tank body (4) is used for irradiation control in different regions, the ink sprayed on the surface of the printing tank body (4) is irradiated and cured, and the process of the irradiation control in different regions in S4 comprises the following steps: S401, the division of the irradiation section, the substrate of the curing lamp group (5) is divided into a plurality of lamp bead sections controlled by independent switches, the width of each section ranges from 2 to 30 mm, and each section is controlled by the PLC program controller to be turned on and off independently; S402, the triggering of dynamic zoning, when the varnish jet head (202) covers the printed area, the PLC program controller turns off the lamp bead section of the area, after the varnish is leveled, the PLC program controller turns on the lamp bead of the area, when the varnish does not cover the area, the PLC program controller controls the lamp of the area to be always on, and the ink pattern of the color jet head (201) is cured; S403, the switching of the curing mode, the PLC program controller is provided with a full lamp always-on mode and a dynamic zoning mode; S5, the completion of the ink curing of the printing tank body (4), the printing trolley (2) moves linearly along the generatrix direction of the printing tank body (4), so that the remaining surface of the printing tank body (4) is sprayed with ink, the printing tank body (4) rotates, so that the sprayed ink on the surface of the curing lamp group (5) is irradiated and cured, and until the printing ink on the surface of the printing tank body (4) is completely cured.

2. A method of curing an ink for printing on a can body according to claim 1, wherein The clamping rotating assembly (3) in S1 and S2 includes a clamp rotating spindle (301) and a clamp tailstock (302), the clamp rotating spindle (301) and the clamp tailstock (302) are arranged on the top of the printing station (1), the clamp rotating spindle (301) and the clamp tailstock (302) are used for clamping and fixing the printing tank body (4), and the side, away from the printing tank body (4), of the clamp rotating spindle (301) is provided with a tank body rotating motor (303), and the tank body rotating motor (303) is used for driving the printing tank body (4) to rotate.

3. The method of claim 1, wherein the ink is cured by, The width of the lamp bead section in S401 is adjusted in the following manner: The lamp beads on the substrate of the curing lamp group (5) are connected in parallel circuit, each lamp bead section corresponds to an independent driving circuit, and the power supply of the lamp bead section is controlled by the PLC program controller switch; The width of the lamp bead section can be programmed to be 2mm, 10mm, 20mm or 30mm, and the default width is 20mm.

4. The method of claim 1, wherein The full lamp bead constant light mode is represented as: when the light oil painting starts, all the lamp beads remain constant, and the surface of the printing tank body (4) is irradiated, and after the light oil curing is completed, the printing tank body (4) presents a matte effect because the light oil has not enough time to flow away.

5. The method of claim 1, wherein the ink is cured by a method selected from the group consisting of heat, ultraviolet radiation, electron beam radiation, and combinations thereof. The dynamic partition mode is represented as: when the light oil painting starts, the lamp beads of the lamp bead section corresponding to the light oil spray head (202) are closed, and the lamp beads of the remaining lamp bead sections are turned on at full power, after the light oil leveling of the lamp bead section corresponding to the light oil spray head (202) is completed, the lamp beads of the lamp bead section are turned on to irradiate, and after the light oil curing is completed, the printing tank body (4) presents a high gloss effect.

6. The method of claim 1, wherein the ink is cured by a method selected from the group consisting of heat, ultraviolet radiation, electron beam radiation, and combinations thereof. The PLC program controller is controlled in the following steps: First, mode determination, in the full lamp bead constant light mode, the PLC program controller controls the lamp group to be fully bright, and in the dynamic partition mode, when the printing trolley (2) moves, a photoelectric trigger switch (6) is arranged on the moving main beam of the printing trolley (2), the photoelectric trigger switch (6) corresponds to the position of the curing lamp group (5), and the photoelectric trigger switch (6) is used for detecting the straight-line distance L from the light oil spray head (202); Second, PLC program controller judgment, the trigger light eye of the photoelectric trigger switch (6) transmits the distance L data to the PLC program controller, and the PLC program controller controls the opening and closing of the lamp bead section; Third, light control, each group of lamp beads in the curing lamp group (5) corresponds to the control contact of the PLC program controller, and the initial state of the curing lamp group (5) is illumination state, in the movement process of the light oil spray head (202), the PLC program controller controls the curing lamp group (5) according to the distance L, closes the lamp beads corresponding to the position at the bottom of the light oil spray head (202), and when the light oil spray head (202) leaves the area, part of the lamp beads are turned on to irradiate and cure the light oil.

7. The method of claim 1, wherein the ink is cured by a method selected from the group consisting of heat, ultraviolet radiation, electron beam radiation, and combinations thereof. The end of the trolley body driving motor (203) is provided with a lead screw, the lead screw is rotated, and the color spray head (201) and the light oil spray head (202) are moved under the cooperation of threads.

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