Tank printing ink curing method

Abstract

The invention discloses a tank body printing ink curing method. The method comprises the following steps that S1, a printing tank body is fixed; s2, rotating the printing tank body; s3, ink spraying: ink is sprayed through a color spray head and a gloss oil spray head which are arranged at the bottom of the printing trolley, and the ink is sprayed on the surface of the printing tank body; s4, ink curing irradiation is conducted, specifically, irradiation is controlled by a curing lamp set in a partitioned mode, and the jet printing ink on the surface of the printing tank is subjected to irradiation curing; s5, curing of the ink in the printing tank is completed, the printing trolley moves in the bus direction of the printing tank, the other surfaces of the printing tank are sprayed with the ink, the printing tank rotates, and the ink sprayed on the surfaces of the curing lamp sets is irradiated and cured until the printing ink on the surfaces of the printing tank is completely cured; according to the method, the gloss oil is sprayed by the gloss oil spray head through the partitioned irradiation of the curing lamp set, and compared with the existing integrated control irradiation of curing lamp beads, the method realizes the gloss oil curing brightness of the surface of the tank body through the partitioned irradiation design of the curing lamp set.

Description

Technical Field

[0001] The invention relates to the technical field of tube and tank body coloring equipment, and in particular to a method for curing tank body printing ink. Background Art

[0002] In the inkjet printing process on can surfaces, the curing effect of varnish directly affects the appearance quality and weather resistance of the coating. Existing curing methods suffer from the problem of insufficient leveling due to synchronous curing. Traditional curing lamps are controlled in conjunction with the printhead, and the entire varnish is immediately irradiated after spraying, without allowing enough time for the varnish to level. This results in uneven surface tension, resulting in defects such as craters and orange peel patterns, which affect the gloss of the coating on the can surface.

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

[0004] The object of the present invention is to provide a method for curing ink for can printing, so as to solve the problems raised in the above background technology.

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

[0006] S1, fix the printing tank body by clamping one end of the rotating assembly to fix the printing tank body on the top of the printing station;

[0007] S2, the rotation of the printing tank body, driving the printing tank body to rotate by clamping the other end of the rotating assembly;

[0008] S3, ink spraying, the color nozzle and varnish nozzle installed at the bottom of the printing carriage spray ink, and the ink is sprayed on the surface of the printing tank;

[0009] S4, curing of the ink, which is controlled by a curing lamp assembly located on the top of the printing station and on the bottom or side of the printed tank, to cure the ink sprayed on the surface of the printed tank;

[0010] S5, the ink on the printed tank body is cured, and the printing carriage moves linearly along the main line of the printed tank body, so that the remaining surface of the printed tank body is sprayed with ink. The printed tank body rotates, so that the ink sprayed on its surface by the curing lamp group is irradiated and cured until the ink on the surface of the printed tank body is completely cured.

[0011] Preferably, the clamping and rotating components in S1 and S2 include a clamp rotating spindle and a clamp tailstock, which are arranged at the top of the printing station, and are used to clamp and fix the printed tank body. A tank body rotating motor is provided on the side of the clamp rotating spindle away from the printed tank body, and the tank body rotating motor is used to drive the printed tank body to rotate.

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

[0013] S301, inkjet printing of the pattern: the color nozzle performs inkjet printing, and the rotation of the printing tank body is coordinated to spray the color pattern on the surface of the printing section of the printing tank body;

[0014] S302, varnish painting, the body drive motor drives the printing carriage to move, the color nozzle and the varnish nozzle move synchronously, the color nozzle repeats the S301 process on the remaining unsprayed parts of the printed tank body, and the varnish nozzle sprays varnish on the printed tank body parts after the color pattern spraying in step S301, and the varnish is sprayed on the surface of the color pattern on the outer wall of the printed tank body through the rotation of the printed tank body.

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

[0016] S401, irradiation section division: the base plate 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, and each section is independently controlled by the PLC program controller;

[0017] S402, dynamic partitioning is triggered. When the varnish nozzle covers the printed area, the PLC program controller turns off the lamp bead section in that area. After the varnish is leveled, the PLC program controller turns on the lamp bead in that area. When in the area not covered by the varnish, the PLC program controller controls the lamp in that area to stay on to solidify the inkjet pattern of the color nozzle;

[0018] S403, curing mode switching, the full lamp bead constant light mode and dynamic partition mode are set through the PLC program controller.

[0019] Preferably, the width of the lamp bead segment in S401 is adjusted by the following method:

[0020] The lamp beads on the base plate of the curing lamp group are connected in parallel circuits. Each lamp bead segment corresponds to an independent drive circuit, and the power supply of the lamp bead segment is controlled by the PLC program controller.

[0021] The width of the lamp segment can be programmed to 2mm, 10mm, 20mm or 30mm, and the default width is 20mm.

[0022] Preferably, the all-lamp-bead constant-on mode is represented as follows: when the varnish application starts, all lamp beads remain constant on to irradiate the surface of the printed tank body. After the varnish is cured, the printed tank body presents a matte effect because the varnish does not have enough time to flow away.

[0023] Preferably, the dynamic partitioning mode is represented as follows: when the varnish application starts, the varnish nozzle is closed to spray the lamp beads of the corresponding lamp bead section, and the lamp beads of the remaining lamp bead sections are turned on at full power. After the varnish corresponding to the lamp bead section is leveled, the lamp beads of the lamp bead section are turned on to irradiate. After the varnish is cured, the printed tank body presents a high gloss effect.

[0024] Preferably, the PLC program controller adopts the following steps for control:

[0025] First, the mode is determined. In the full-lamp constant-on mode, the PLC program controller controls the full lighting of the lamp group. In the dynamic partitioning mode, when the printing carriage moves, a photoelectric trigger switch is provided on the moving main beam of the printing carriage. The photoelectric trigger switch corresponds to the position of the curing lamp group and is used to detect the linear distance L between it and the varnish nozzle.

[0026] Second, the PLC program controller determines that the triggering of the photoelectric trigger switch 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;

[0027] Third, regarding lighting control, each set of lamps in the curing lamp assembly corresponds to a control contact of a PLC program controller. The curing lamp assembly is initially illuminated. As the varnish applicator moves, the PLC program controller controls the curing lamp assembly based on distance L, turning off the lamps corresponding to the bottom of the varnish applicator. When the varnish applicator leaves this area, these lamps turn on to cure the varnish. Preferably, a screw is provided at the end of the vehicle drive motor. The rotation of the screw, coupled with the threaded connection, drives the movement of the color and varnish applicators.

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

[0029] The present invention provides a curing lamp group on the top of the printing station. As the color nozzle and the varnish nozzle perform inkjet printing on the printed tank body, the curing lamp group irradiates the varnish sprayed by the varnish nozzle in zones, giving the varnish time to level. After the printing carriage moves, the curing lamp beads at the rear zone end are turned on to cure the varnish, and finally a bright varnish surface is formed on the surface of the workpiece. Compared with the existing curing lamp beads that are controlled in an integrated manner and simultaneously irradiate and cure the ink on the printed tank body surface, the present method achieves a bright varnish cured on the tank body surface through the zoned irradiation design of the curing lamp group. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0031] Figure 2 This is the second schematic diagram of the overall structure of the present invention.

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

[0033] Figure 4 2 is a top view of the curing lamp assembly of the present invention.

[0034] In the figure: 1. Printing station; 2. Print carriage; 201. Color nozzle; 202. Varnish nozzle; 203. Carriage drive motor; 3. Clamping and rotating assembly; 301. Fixture rotation spindle; 302. Fixture tailstock; 303. Tank rotation motor; 4. Printing tank; 5. Curing lamp assembly; 6. Photoelectric trigger switch. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] The present invention provides Figure 1-4 The method for curing ink for printing on a tank body shown includes the following steps:

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

[0038] S2, the printing tank body 4 rotates, and the printing tank body 4 is driven to rotate by the other end of the clamping rotating assembly 3;

[0039] It should be noted that the clamping and 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 to clamp and fix the printing tank body 4. A tank body rotating motor 303 is provided on the side of the clamp rotating spindle 301 away from the printing tank body 4. The tank body rotating motor 303 is used to drive the printing tank body 4 to rotate.

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

[0041] S3, ink spraying, the color nozzle 201 and the varnish nozzle 202 provided at the bottom of the printing carriage 2 spray ink, and the ink is sprayed on the surface of the printing tank 4;

[0042] S4, curing of the ink, by irradiating the ink sprayed on the surface of the printing tank 4 with a curing lamp group 5 arranged on the top of the printing station 1 and located at the bottom or side of the printing tank 4 to control the irradiation in different zones;

[0043] It should be noted that the color nozzle 201 is arranged on the side of the varnish nozzle 202 located at the forward end of the printing carriage 2. After printing the can body 4, it is usually necessary to spray a layer of protective varnish on the surface of the pattern sprayed by the color nozzle 201. Because the ink sprayed onto the surface of the can body by the nozzle during digital printing is in the form of dots, if it is cured immediately, the varnish will appear as dots and have no gloss.

[0044] Specifically, the curing lamp group 5 is an LED lamp group;

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

[0046] S301, inkjet printing of the pattern: the color nozzle 201 performs inkjet printing, and in conjunction with the rotation of the printing tank body 4, a color pattern is sprayed on the surface of the printing section of the printing tank body 4;

[0047] S302, varnish painting: the carriage drive motor 203 drives the printing carriage 2 to move, and 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 printed tank body 4. The varnish nozzle 202 sprays varnish on the parts of the printed tank body 4 that have completed the color pattern spraying in step S301. As the printed tank body 4 rotates, the varnish is sprayed onto the surface of the color pattern on the outer wall of the printed tank body 4;

[0048] It should be noted that a screw is provided at the end of the vehicle body driving motor 203, and the rotation of the screw drives the movement of the color nozzle 201 and the varnish nozzle 202 under the cooperation of the thread;

[0049] S5: After the ink on the tank body 4 is cured, the printing carriage 2 moves linearly along the generatrix of the tank body 4, so that the remaining surface of the tank body 4 is sprayed with ink. The tank body 4 rotates, so that the curing lamp group 5 irradiates and cures the ink on its surface until the ink on the surface of the tank body 4 is completely cured.

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

[0051] S401, irradiation section division: the base plate 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, and each section is independently controlled by the PLC program controller;

[0052] S402, dynamic partitioning is triggered. When the varnish nozzle 202 covers the printed area, the PLC program controller turns off the lamp bead section in that area. After the varnish is leveled, the PLC program controller turns on the lamp bead in that area. When the varnish is not covered in the area, the PLC program controller controls the lamp in that area to remain on to solidify the inkjet pattern of the color nozzle 201;

[0053] S403, curing mode switching, the full lamp bead constant light mode and dynamic partition mode are set through the PLC program controller.

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

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

[0056] The width of the lamp segment can be programmed to 2mm, 10mm, 20mm or 30mm, and the default width is 20mm;

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

[0058] The full lamp bead constant light mode means that when the varnish is applied, all lamp beads remain constant light to illuminate the surface of the printed tank body 4. After the varnish is cured, the printed tank body 4 presents a matte effect because the varnish does not have enough time to flow away.

[0059] The dynamic partitioning mode is represented as follows: when the varnish is applied, the varnish nozzle 202 is turned off to spray the lamp beads of the corresponding lamp bead section, and the lamp beads of the other lamp bead sections are turned on at full power. After the varnish corresponding to the lamp bead section is leveled, the lamp beads of the lamp bead section are turned on to irradiate. After the varnish is cured, the printed tank body 4 presents a high gloss effect.

[0060] It should be noted that the matte effect and high gloss effect can be flexibly adjusted according to the needs of the manufacturer;

[0061] Specifically, the PLC program controller adopts the following steps for control:

[0062] First, the mode is determined. In the full-lamp constant-on mode, the PLC program controller controls the full lighting of the lamp group. In the dynamic partitioning mode, when the print carriage 2 moves, a photoelectric trigger switch 6 is provided on the moving main beam of the print carriage 2. The photoelectric trigger switch 6 corresponds to the position of the curing lamp group 5 and is used to detect the linear distance L between it and the varnish nozzle 202.

[0063] Second, the PLC program controller determines that the trigger of the photoelectric trigger switch 6 turns off the light eye and 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;

[0064] Third, light control. Each group of lamp beads in the curing lamp group 5 corresponds to the control contacts 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, and turns off the lamp beads corresponding to the bottom of the varnish nozzle 202. When the varnish nozzle 202 leaves this area, this part of the lamp beads turns on the varnish irradiation and curing.

[0065] It should be noted that the position of the photoelectric trigger switch 6 is fixed, and the printing carriage 2 is mobile. It is controlled by measuring the distance L between it and the varnish nozzle 202 in the printing carriage 2. Each L value corresponds to a group of lamp beads of the curing lamp group 5. This group of lamp 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, and the closing width of the lamp 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 varnish is released by turning off the LED lamp beads of the curing lamp group 5 in the area corresponding to the varnish nozzle, thereby achieving a bright light effect without affecting the entire printing process. The LED lamp control method in this case is not limited to varnish printing and can also be used for ink supply, primer or other ink processes that require release.

[0067] During actual use, the present invention is provided with a curing lamp group 5 on the top of the printing station 1. As the color nozzle 201 and the varnish nozzle 202 inkjet print on the printed tank body 4, the curing lamp group 5 detects the varnish nozzle 202 in sections, and then the curing lamp group 5 is powered off. After the sprayed varnish is leveled, the above-mentioned power-off lamp bead section is turned on again to irradiate and cure the varnish after the printing carriage 2 moves, and finally a bright varnish surface is formed on the surface of the workpiece. Compared with the existing curing lamp bead integrated control, which simultaneously irradiates and cures the ink on the surface of the printed tank body 4, the present method realizes the brightness of the varnish cured on the tank surface through the zoned irradiation design of the curing lamp group 5.

[0068] Finally, it should be noted that the above 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 aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for curing ink for can printing, characterized in that: The following steps are involved: S1, the printing tank body (4) is fixed by clamping one end of the rotating assembly (3) to fix the printing tank body (4) on the top of the printing station (1); S2, the printing tank body (4) rotates, and the printing tank body (4) is driven to rotate by the other end of the clamping rotating assembly (3); S3, spraying ink, through the color nozzle (201) and the varnish nozzle (202) provided at the bottom of the printing carriage (2), the ink is sprayed on the surface of the printing tank (4); S4, curing irradiation of the ink, by controlling the irradiation in different zones by a curing lamp group (5) arranged on the top of the printing station (1) and located at the bottom or side of the printing tank body (4), to irradiate and cure the ink sprayed on the surface of the printing tank body (4); S5, the ink of the printed tank body (4) is cured, the printing carriage (2) moves linearly along the busbar direction of the printed tank body (4), so that the remaining surface of the printed tank body (4) is sprayed with ink, and the printed tank body (4) rotates, so that the curing lamp group (5) irradiates and cures the sprayed ink on its surface until the printed ink on the surface of the printed tank body (4) is completely cured.

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

3. The method for curing ink for can printing according to claim 1, characterized in that: The ink spraying in S3 includes the following steps: S301, spraying of a pattern, the color nozzle (201) performs inkjet printing, and in conjunction with the rotation of the printing tank body (4), a color pattern is sprayed on the surface of the spraying section of the printing tank body (4); S302, varnish painting, the vehicle body driving 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 printed tank body (4), and the varnish nozzle (202) sprays varnish on the parts of the printed tank body (4) after the color pattern spraying is completed in step S301, and the varnish is sprayed on the color pattern surface of the outer wall of the printed tank body (4) through the rotation of the printed tank body (4).

4. The method for curing ink for can printing according to claim 3, characterized in that: The partition control process in S4 includes the following steps: S401, irradiation section division, the base plate of the curing lamp group (5) is divided into a plurality of independently switch-controlled lamp bead sections, the width of each section ranges from 2 to 30 mm, and each section is individually on-off controlled by a PLC program controller; S402, dynamic partitioning is triggered. When the varnish nozzle (202) covers the printed area, the PLC program controller turns off the lamp bead section in the area. After the varnish is leveled, the PLC program controller turns on the lamp bead in the area. When the varnish is not covered in the area, the PLC program controller controls the lamp in the area to be always on, and solidifies the inkjet pattern of the color nozzle (201); S403, curing mode switching, through the PLC program controller to set the full lamp bead constant light mode and dynamic partition mode.

5. The method for curing ink for can printing according to claim 4, characterized in that: The width of the lamp bead segment in S401 is adjusted by the following method: The lamp beads on the substrate of the curing lamp group (5) are connected in parallel circuits, and each lamp bead segment corresponds to an independent driving circuit, and the power supply of the lamp bead segment is controlled by the PLC program controller switch; The width of the lamp segment can be programmed to 2mm, 10mm, 20mm or 30mm, and the default width is 20mm.

6. The method for curing ink for can printing according to claim 4, characterized in that: The all-lamp-bead constant-on mode is represented as follows: when the varnish is applied, all the lamp beads remain constant on to irradiate the surface of the printed tank body (4); after the varnish is cured, the printed tank body (4) presents a matte effect because the varnish does not have enough time to flow away.

7. The method for curing ink for can printing according to claim 4, characterized in that: The dynamic partitioning mode is represented as follows: when the varnish is applied, the varnish nozzle (202) is closed to spray the lamp beads of the corresponding lamp bead section, and the lamp beads of the other lamp bead sections are turned on at full power. After the varnish corresponding to the lamp bead section is leveled, the lamp beads of the lamp bead section are turned on to irradiate. After the varnish is cured, the printed tank body (4) presents a high gloss effect.

8. The method for curing ink for can printing according to claim 4, characterized in that: The PLC program controller adopts the following steps to perform control: First, the mode is determined. In the full-lamp constant-on mode, the PLC program controller controls the full-lamp group to light up. In the dynamic partition mode, when the printing carriage (2) moves, a photoelectric trigger switch (6) is provided on the moving 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-line distance L between the photoelectric trigger switch (6) and the varnish nozzle (202); Second, the PLC program controller determines that the triggering of the photoelectric trigger switch (6) transmits the distance L data to the PLC program controller, and the PLC program controller performs the on-off control 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 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, and turns off the lamp beads corresponding to the bottom of the varnish nozzle (202). When the varnish nozzle (202) leaves the area, the lamp beads of this part are turned on for varnish irradiation and curing.

9. The method for curing ink for can printing according to claim 3, characterized in that: A screw rod is provided at the end of the vehicle body driving motor (203), and the color nozzle (201) and the varnish nozzle (202) are driven to move by the rotation of the screw rod in conjunction with the thread.

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