Printing and drying production line of green printing technology and printing method

Abstract

The invention provides a printing and drying production line of a green printing technology and a printing method, and relates to the technical field of printing. The printing method of the green printing technology comprises the following steps that S1, a temperature curve is generated and adjusted based on the printing ink type and thickness of a printed matter; s2, the air velocity in the drying process is dynamically adjusted by detecting the tension and deformation condition of the surface of the printed matter in real time; s3, a sensor is used for monitoring the ink curing state in the drying process in real time, and the drying time is dynamically adjusted; and S4, running parameters of the humidifying or dehumidifying equipment are automatically adjusted by monitoring the humidity in the drying chamber in real time. Accurate control and real-time adjustment of the temperature curve, the air velocity, the drying time and the humidity in the drying chamber are achieved, the problems that printing ink is dried unevenly, the surface of a printed matter is wrinkled, the printing ink is not completely cured, and the printed matter deforms are effectively solved, and the printing quality and the production efficiency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of printing, in particular to a printing drying production line and a printing method using green printing technology. Background Art

[0002] The current development trend of the printing and packaging industry is also intelligent, streamlined and environmentally friendly. The working principle of the printing drying production line is to use the heating and ventilation devices in the drying unit to accelerate the drying of the ink after printing. For solvent-based inks, drying is mainly to volatilize the organic solvent in the ink; for water-based inks, drying is to remove moisture and a small amount of additives; for UV inks, the polymerization reaction is initiated by ultraviolet rays to solidify the ink. Throughout the process, the conveying system ensures the orderly transfer of printed products between various units, and the control system ensures that the drying conditions meet the requirements of ink drying, so as to obtain high-quality printed products.

[0003] However, in the actual application of printing production lines, how to accurately control the temperature curve to avoid uneven drying of ink due to uneven temperature; secondly, how to dynamically adjust the air flow rate to prevent wrinkles on the surface of printed products due to air flow changes; thirdly, how to monitor the drying time in real time to ensure that the ink can be fully cured to avoid quality problems; and finally, how to monitor and compensate for humidity changes in real time during the drying process to prevent deformation of printed products. These challenges need to be solved through technological innovation and precise control systems to ensure the efficiency of the printing process and the stability of product quality. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides a printing drying production line and a printing method of green printing technology, which solve the problems of uneven ink drying, wrinkling on the surface of printed products, incomplete curing of ink and deformation of printed products.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: A printing method of green printing technology, comprising the following steps:

[0006] S1. Generate and adjust the temperature curve based on the ink type and thickness of the printed product to achieve precise control to avoid uneven ink drying;

[0007] S2. By real-time detection of the tension and deformation of the printed surface, the air flow rate during the drying process is dynamically adjusted to prevent wrinkles on the printed surface;

[0008] S3. Use sensors to monitor the ink curing status in real time during the drying process and dynamically adjust the drying time to ensure that the ink is completely cured;

[0009] S4. Through real-time monitoring of the humidity in the drying room, the operating parameters of the humidification or dehumidification equipment are automatically adjusted to compensate for humidity changes and prevent deformation of printed products.

[0010] Preferably, the step S1 specifically includes the following process:

[0011] Obtaining the initial temperature and drying target temperature of the ink;

[0012] Generate an initial temperature profile based on the viscosity and thickness of the ink;

[0013] The temperature sensor detects the current temperature of the ink in real time and adjusts the temperature curve according to the feedback data;

[0014] If the current temperature of the ink is T1 and the target temperature is T2, when T1 ≥ T2 + dT, the heating power is reduced, otherwise the heating power is increased, where T1 represents the current ink temperature, T2 represents the target temperature, and dT represents the maximum allowable temperature difference.

[0015] Preferably, the specific process of generating the initial temperature curve based on the viscosity and thickness of the ink is as follows:

[0016] Calculate the thermal conductivity of the ink;

[0017] Generate an initial temperature distribution curve based on ink thickness;

[0018] Use algorithms to optimize the initial temperature distribution curve;

[0019] The ink thickness is H. When H>h0, the maximum temperature of the temperature curve is increased, otherwise the default temperature is maintained, where H represents the ink thickness and h0 represents the preset critical thickness value.

[0020] Preferably, the specific process of optimizing the initial temperature distribution curve using an algorithm is as follows:

[0021] Apply optimization algorithms to calculate the optimal temperature gradient;

[0022] Verify optimization results through multiple simulations;

[0023] Generate the final temperature distribution curve based on the simulation results;

[0024] If the uniformity index E of the temperature distribution is greater than the set threshold ET, the optimization continues; otherwise, the optimization ends, where E represents the uniformity index of the temperature distribution and ET represents the set uniformity threshold.

[0025] A printing production line of a printing method applying the green printing technology comprises: a conveyor belt, an inkjet device is arranged on one side of the top of the conveyor belt, a drying chamber is arranged on the other side of the top of the conveyor belt, a fan is fixedly connected to the outer wall surface of the top of the drying chamber, an electric heating tube is fixedly connected to the inner wall surface of the top of the drying chamber, and the position of the electric heating tube corresponds to the fan, a laser sensor is fixedly connected to the bottom of the protruding part on one side of the top of the drying chamber, a humidifying device is fixedly connected to the inner wall surface of the front side of the drying chamber, a dehumidifying device is fixedly connected to the inner wall surface of the rear side of the drying chamber, a temperature sensor and a humidity sensor are respectively fixedly connected to the inner wall surface of the top of the drying chamber, and the temperature sensor and the humidity sensor are located on the other side of the electric heating tube.

[0026] Working principle: First, place the cardboard on the conveyor belt, and then perform inkjet printing when the cardboard passes through the inkjet device. At the same time, the temperature sensor obtains the initial temperature and drying target temperature of the ink, and adjusts the temperature curve to achieve precise control, thereby avoiding uneven drying of the ink; the laser sensor is used to monitor the stress and deformation data on the surface of the printed matter in real time, and the wind speed and direction of the fan are dynamically adjusted according to these data; through the installation of multiple temperature and humidity sensors in the drying room, the data of the drying process are continuously collected, and the data is used to evaluate the curing degree of the ink in real time, and then the drying time is adjusted to ensure the complete curing of the ink; through the real-time monitoring of the humidity in the drying room, the operating parameters of the humidification or dehumidification equipment are automatically adjusted to compensate for humidity changes and prevent deformation of printed matters.

[0027] The present invention provides a printing and drying production line and a printing method of green printing technology, which have the following beneficial effects:

[0028] 1. The present invention detects the initial temperature of the ink through a temperature sensor and generates an initial temperature curve based on the viscosity and thickness of the ink; at the same time, the temperature curve is adjusted in time according to the current temperature of the ink, and then further adjusted through an optimization algorithm to ensure uniform temperature distribution, thereby avoiding uneven drying of the ink.

[0029] 2. The present invention detects the tension and deformation of the printed surface in real time and immediately adjusts the air flow rate to reduce the impact of air flow on the printed surface, thereby preventing the printed surface from wrinkling.

[0030] 3. The present invention uses sensors to monitor the ink curing state in the drying process in real time and dynamically adjust the drying time; when the system detects that the ink is not completely cured, the drying time is extended; if it is detected that the ink is completely cured, the drying is stopped to ensure that the ink is completely cured and avoid quality problems.

[0031] 4. The present invention automatically adjusts the operating parameters of the humidification or dehumidification equipment through real-time monitoring of the humidity in the drying room to compensate for humidity changes and prevent deformation of printed products caused by humidity fluctuations. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the production line structure of the present invention;

[0033] Figure 2 It is a structural schematic diagram of a drying chamber of the present invention;

[0034] Figure 3 It is a schematic diagram of the internal structure of the drying chamber of the present invention.

[0035] Among them, 1. Conveyor belt; 2. Drying room; 3. Inkjet equipment; 4. Fan; 5. Laser sensor; 6. Electric heating tube; 7. Dehumidification equipment; 8. Humidification equipment; 9. Temperature sensor; 10. Humidity sensor. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Embodiment 1:

[0038] The embodiment of the present invention provides a printing method of green printing technology, comprising the following steps:

[0039] S1. Based on the ink type and thickness of the printed product, generate and adjust the temperature curve to achieve precise control to avoid uneven ink drying; first use the temperature sensor to obtain the initial temperature and drying target temperature of the ink. Then, generate the initial temperature curve according to the viscosity and thickness of the ink. This process specifically includes: calculating the thermal conductivity of the ink, generating the initial temperature distribution curve according to the ink thickness, and optimizing the initial temperature distribution curve using an algorithm. Specifically, assuming that the ink thickness is H, the preset critical thickness value is h0, if H>h0, increase the maximum temperature of the temperature curve to speed up the drying speed; otherwise, maintain the default temperature. In addition, the current temperature of the ink is detected in real time by the temperature sensor, and the temperature curve is adjusted according to the feedback data. For example, if the current temperature T1 is close to the target temperature T2 (that is, T1≥T2+dT, dT represents the maximum allowable temperature difference), the heating power is appropriately reduced to avoid overheating; otherwise, the heating power is increased to ensure that the ink can be dried evenly. In this way, the problem of uneven ink drying is effectively avoided.

[0040] S2. By real-time detection of the tension and deformation of the printed surface, the air flow rate during the drying process is dynamically adjusted to prevent wrinkles on the printed surface; the laser sensor is used to monitor the stress and deformation data of the printed surface in real time, and the wind speed and direction are dynamically adjusted according to these data. Specifically, if the tension on the printed surface exceeds the preset safety range, the system will automatically increase the wind speed to reduce the surface tension; if the printed surface has local wrinkles, the system will increase the air flow rate near these areas to help flatten the printed surface. In this way, not only can the wrinkle problem on the printed surface be effectively avoided, but the overall flatness and aesthetics of the printed surface are also improved.

[0041] S3. Use sensors to monitor the curing state of the ink in the drying process in real time, dynamically adjust the drying time, and ensure that the ink is completely cured; through multiple temperature and humidity sensors installed in the drying room, continuously collect data during the drying process, and use these data to evaluate the curing degree of the ink in real time. For example, if the ink in a certain area has not yet reached the curing standard (such as insufficient hardness or unstable color), the system will extend the drying time of that area. On the contrary, for areas that have already cured to the standard, the system will reduce the drying time of that area in a timely manner to save energy and improve production efficiency. This method not only ensures the complete curing of the ink, but also greatly improves the intelligent and refined management level of the drying process.

[0042] S4. Through real-time monitoring of the humidity in the drying room, the operating parameters of the humidification or dehumidification equipment are automatically adjusted to compensate for humidity changes and prevent deformation of printed products; humidity changes in the drying room are continuously monitored using a humidity sensor, and the operating parameters of the humidifier or dehumidifier are dynamically adjusted according to the monitoring results. For example, if the humidity is detected to be lower than the set range (30% to 50%), the humidification equipment is automatically started to increase the humidity in the drying room; if the humidity exceeds the set range, the dehumidification equipment is started to reduce the humidity in the drying room. In this way, not only the humidity in the drying room is ensured to be kept within the optimal range, but also the deformation of printed products caused by humidity changes is effectively prevented, ensuring the quality and stability of printed products.

[0043] Through the above four steps, combined with real-time monitoring, intelligent control and algorithm optimization, precise control and real-time adjustment of temperature curve, air flow rate, drying time and humidity in the drying room are achieved, effectively solving problems such as uneven ink drying, wrinkling on the surface of printed products, incomplete curing of ink and deformation of printed products, improving printing quality and production efficiency, and achieving efficient, environmentally friendly and high-quality printing production. This method not only significantly improves the quality of printed products, but also greatly reduces energy consumption and production costs, and has broad application prospects.

[0044] The specific process of using the algorithm to optimize the initial temperature distribution curve is as follows:

[0045] Apply optimization algorithms to calculate the optimal temperature gradient;

[0046] Verify optimization results through multiple simulations;

[0047] Generate the final temperature distribution curve based on the simulation results;

[0048] If the uniformity index E of the temperature distribution is greater than the set threshold ET, the optimization continues; otherwise, the optimization ends, where E represents the uniformity index of the temperature distribution and ET represents the set uniformity threshold.

[0049] Embodiment 2:

[0050] Reference Figure 1-3 The embodiment of the present invention provides a printing production line using a green printing technology printing method, comprising: a conveyor belt 1, an inkjet device 3 is arranged on one side of the top of the conveyor belt 1, a drying chamber 2 is arranged on the other side of the top of the conveyor belt 1, a fan 4 is fixedly connected to the outer wall surface of the top of the drying chamber 2, an electric heating tube 6 is fixedly connected to the inner wall surface of the top of the drying chamber 2, and the position of the electric heating tube 6 corresponds to the fan 4, a laser sensor 5 is fixedly connected to the bottom of the protruding part on one side of the top of the drying chamber 2, a humidifying device 8 is fixedly connected to the inner wall surface of the front side of the drying chamber 2, a dehumidifying device 7 is fixedly connected to the inner wall surface of the rear side of the drying chamber 2, a temperature sensor 9 and a humidity sensor 10 are fixedly connected to the inner wall surface of the top of the drying chamber 2, and the temperature sensor 9 and the humidity sensor 10 are located on the other side of the electric heating tube 6.

[0051] When the above production line is in use, the cardboard is first placed on the conveyor belt 1, and inkjet printing is performed on the cardboard when it passes through the inkjet device 3. At the same time, the temperature sensor 9 obtains the initial temperature and drying target temperature of the ink, and adjusts the temperature curve to achieve precise control, thereby avoiding uneven drying of the ink; the laser sensor 5 is used to monitor the stress and deformation data on the surface of the printed matter in real time, and the wind speed and wind direction of the fan 4 are dynamically adjusted according to these data; through the multiple temperature and humidity sensors installed in the drying chamber 2, the data of the drying process are continuously collected, and the curing degree of the ink is evaluated in real time using these data, and then the drying time is adjusted to ensure complete curing of the ink; through real-time monitoring of the humidity in the drying chamber 2, the operating parameters of the humidification or dehumidification equipment are automatically adjusted to compensate for humidity changes and prevent deformation of the printed matter.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A printing method of green printing technology, characterized in that: The following steps are involved: S1. Generate and adjust the temperature curve based on the ink type and thickness of the printed product to achieve precise control to avoid uneven ink drying; S2. By real-time detection of the tension and deformation of the printed surface, the air flow rate during the drying process is dynamically adjusted to prevent wrinkles on the printed surface; S3. Use sensors to monitor the ink curing status in real time during the drying process and dynamically adjust the drying time to ensure that the ink is completely cured; S4. Through real-time monitoring of the humidity in the drying room, the operating parameters of the humidification or dehumidification equipment are automatically adjusted to compensate for humidity changes and prevent deformation of printed products.

2. According to the green printing technology of claim 1, the printing drying production line and printing method are characterized by: The S1 step specifically includes the following process: Obtaining the initial temperature and drying target temperature of the ink; Generate an initial temperature profile based on the viscosity and thickness of the ink; The temperature sensor detects the current temperature of the ink in real time and adjusts the temperature curve according to the feedback data; If the current temperature of the ink is T1 and the target temperature is T2, when T1 ≥ T2 + dT, the heating power is reduced, otherwise the heating power is increased, where T1 represents the current ink temperature, T2 represents the target temperature, and dT represents the maximum allowable temperature difference.

3. According to the green printing technology of claim 2, the printing drying production line and printing method are characterized in that: The specific process of generating the initial temperature curve based on the viscosity and thickness of the ink is as follows: Calculate the thermal conductivity of the ink; Generate an initial temperature distribution curve based on ink thickness; Use algorithms to optimize the initial temperature distribution curve; The ink thickness is H. When H>h0, the maximum temperature of the temperature curve is increased, otherwise the default temperature is maintained, where H represents the ink thickness and h0 represents the preset critical thickness value.

4. The printing drying production line and printing method of the green printing technology according to claim 3 are characterized by: The specific process of optimizing the initial temperature distribution curve using the algorithm is as follows: Apply optimization algorithms to calculate the optimal temperature gradient; Verify optimization results through multiple simulations; Generate the final temperature distribution curve based on the simulation results; If the uniformity index E of the temperature distribution is greater than the set threshold ET, the optimization continues; otherwise, the optimization ends, where E represents the uniformity index of the temperature distribution and ET represents the set uniformity threshold.

5. A printing production line using the printing method of the green printing technology according to any one of claims 1 to 4, characterized in that: include: A conveyor belt (1), an inkjet device (3) is arranged on one side of the top of the conveyor belt (1), a drying chamber (2) is arranged on the other side of the top of the conveyor belt (1), a fan (4) is fixedly connected to the outer wall surface of the top of the drying chamber (2), an electric heating tube (6) is fixedly connected to the inner wall surface of the top of the drying chamber (2), and the position of the electric heating tube (6) corresponds to the fan (4), a laser sensor (5) is fixedly connected to the bottom of the protruding part on one side of the top of the drying chamber (2), a humidifying device (8) is fixedly connected to the inner wall surface of the front side of the drying chamber (2), a dehumidifying device (7) is fixedly connected to the inner wall surface of the rear side of the drying chamber (2), and a temperature sensor (9) and a humidity sensor (10) are respectively fixedly connected to the inner wall surface of the top of the drying chamber (2), and the temperature sensor (9) and the humidity sensor (10) are located on the other side of the electric heating tube (6).

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