Impression Roller Adaptive Pressure Compensation Mechanism and Paperboard Printing Equipment

Abstract

This invention discloses an adaptive pressure compensation mechanism for an impression roller and a paperboard printing apparatus, comprising an impression roller, an adjusting roller, a telescopic adjusting shaft, a sensing module, and a control module. The adjusting roller presses the paperboard to be printed against the roller surface of the impression roller to adjust the printing pressure. The telescopic adjusting shaft is installed on both sides of the adjusting roller and adjusts the position of the adjusting roller by telescopic adjustment to adjust the printing pressure. The sensing module is installed on the roller surface of the adjusting roller and is used to collect the printing speed and printing pressure of the paperboard printing in real time. The control module includes a data acquisition unit, a calculation unit, and a control adjustment unit. The data acquisition unit is used to acquire the data collected in real time by the sensing module, as well as information data of the printing ink and the paperboard to be printed. The calculation unit calculates the theoretical printing pressure based on the data acquired by the data acquisition unit. The control adjustment unit controls and adjusts the printing pressure based on the theoretical printing pressure calculated by the calculation unit and the real-time printing pressure acquired by the sensing module.

Description

Technical Field

[0001] This invention relates to the field of paperboard printing technology, and more specifically, to an adaptive pressure compensation mechanism for an impression roller and a paperboard printing apparatus. Background Technology

[0002] The printing process for cardboard mainly includes design and plate making, ink coating, impression forming, and post-processing. First, a printing plate is made according to the design. Then, the ink rollers of the printing press evenly transfer ink to the surface of the plate. As the cardboard passes through, the impression roller applies pressure to accurately transfer the image from the plate to the cardboard surface. Finally, the finished product is completed through drying and die-cutting. The impression roller is one of the core components of the printing press. Its main function is to ensure close contact between the printing plate and the cardboard through uniform pressure, thereby transferring the ink clearly and completely to the cardboard surface. Its functions include controlling printing pressure, ensuring sharp edges of the image, preventing ink diffusion, and improving the saturation and consistency of printed colors, playing a crucial role in printing quality and efficiency.

[0003] Traditional impression roller pressure adjustment relies on manual experience or mechanical limiting devices, which is difficult to adapt to fluctuations in material thickness, equipment vibration, or changes in production speed, easily leading to blurred printed patterns, partial omissions, or material crushing. Therefore, this invention provides an adaptive pressure compensation mechanism for impression rollers and a paperboard printing device, which achieves dynamic adjustment of printing pressure by monitoring real-time printing parameters.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] In order to solve the above-mentioned technical problems, the purpose of this invention is to provide an adaptive pressure compensation mechanism for an impression roller and a paperboard printing device, which realizes dynamic adjustment of printing pressure by monitoring real-time printing parameters.

[0006] To achieve the above objectives, the present invention provides a pressure compensation mechanism. In this mechanism, the pressure compensation mechanism includes an impression roller, an adjusting roller, a telescopic adjusting shaft, a sensing module, and a control module. The impression roller has a printing plate mounted on its surface and is used to absorb printing ink and perform paperboard printing. The adjusting roller is installed on one side of the impression roller, and the paperboard to be printed passes between the impression roller and the adjusting roller. The adjusting roller presses the paperboard against the surface of the impression roller and is used to adjust the printing pressure. The telescopic adjusting shaft is installed on both sides of the adjusting roller and is controlled by a motor to extend and retract. The position of the adjusting roller is adjusted to regulate the printing pressure. The sensing module is installed on the roller surface of the adjusting roller and is used to collect real-time printing speed and real-time printing pressure of the paperboard printing. The control module includes a data acquisition unit, a calculation unit, and a control adjustment unit. The data acquisition unit is used to acquire the data collected in real time by the sensing module, as well as information data of the printing ink and the paperboard to be printed. The calculation unit calculates the theoretical printing pressure based on the data acquired by the data acquisition unit. The control adjustment unit controls and adjusts the printing pressure based on the theoretical printing pressure calculated by the calculation unit and the real-time printing pressure acquired by the sensing module.

[0007] Furthermore, in the technical solution of the present invention, the sensing module includes multiple piezoelectric thin film sensors and an infrared counter. The multiple piezoelectric thin film sensors are distributed in a network along the axial direction of the adjusting roller. The multiple piezoelectric thin film sensors are used to monitor real-time printing pressure. The infrared counter is used to record the number of rotations of the adjusting roller per unit time to calculate the printing speed.

[0008] Furthermore, in the technical solution of the present invention, the data acquisition unit acquires the data collected in real time by the sensing module, as well as the information data of the printing ink and the paperboard to be printed, including:

[0009] The sensing module collects data in real time: real-time printing pressure. The number of rotations of the adjusting roller per unit time ;

[0010] Information data on printing inks and paperboard to be printed: Ink viscosity The diameter of the adjusting roller .

[0011] Furthermore, in the technical solution of the present invention, the calculation unit calculates the theoretical printing pressure based on the data acquired by the data acquisition unit, including the following steps:

[0012] S1. Calculate printing speed:

[0013] ;

[0014] In the formula: This is expressed as printing speed;

[0015] S2. Calculate the amount of printing ink transferred:

[0016] ;

[0017] In the formula, Expressed as ink transfer amount, This is expressed as the printing ink transfer coefficient. Expressed as theoretical printing pressure, It is expressed as the contact arc length between the impression roller and the printing paperboard;

[0018] S3. Calculate the effect of printing speed on theoretical printing pressure:

[0019] ;

[0020] In the formula, This is expressed as the speed effect value of theoretical printing pressure. Represented as static pressure, Expressed as velocity-pressure coefficient;

[0021] S4. Calculate the effect of printing speed on printing ink:

[0022] ;

[0023] Always The value representing the effect of ink on theoretical printing pressure is expressed as follows. This is expressed as the ink transfer efficiency constant. Expressed as the ink viscosity attenuation coefficient;

[0024] S5. Calculate the correction value for the theoretical printing pressure:

[0025] ;

[0026] In the formula, This is expressed as a correction value for the theoretical printing pressure.

[0027] Furthermore, in the technical solution of the present invention, the control and adjustment unit controls and adjusts the printing pressure according to the theoretical printing pressure calculated by the calculation unit and the real-time printing pressure obtained by the sensing module, including:

[0028] No adjustment of printing pressure is performed;

[0029] Adjust printing pressure and control the reduction of printing pressure;

[0030] Adjust printing pressure and control the increase of printing pressure.

[0031] Furthermore, in another aspect of the technical solution of the present invention, a paperboard printing apparatus is also provided, which employs a pressure compensation mechanism as described above.

[0032] Effective Gain: In summary, the present invention provides an adaptive pressure compensation mechanism for an impression roller and a paperboard printing device. In the technical solution of the present invention, on the one hand, by setting a sensing and control module on the adjusting roller, the printing speed and printing pressure fluctuations of the paperboard printing device during the printing process are monitored in real time. On the other hand, the present invention performs function fitting on the printing speed and printing pressure, calculates the matching between the printing speed and printing pressure during the printing process through a calculation module, and makes real-time adjustments based on the calculation results, thereby realizing dynamic control of the printing pressure.

[0033] Other features and advantages of the present invention will be set forth in the following description. Attached Figure Description

[0034] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a structural schematic diagram of a pressure compensation mechanism according to the present invention;

[0036] Figure 2 This is a flowchart illustrating the operation of a pressure compensation mechanism according to the present invention.

[0037] In the diagram: A, impression roller; A01, printing plate; B, adjusting roller; C, telescopic adjusting shaft; D, drive roller; P, paperboard to be printed. Detailed Implementation

[0038] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0039] The core of this invention is to provide an adaptive pressure compensation mechanism for an impression roller and a paperboard printing device, which achieves dynamic adjustment of printing pressure by monitoring real-time printing parameters.

[0040] One embodiment of the present invention proposes a pressure compensation mechanism. Figure 1 This is a structural schematic diagram of a pressure compensation mechanism according to an embodiment of the present invention, as shown below. Figure 1 As shown, this embodiment of a pressure compensation mechanism includes an impression roller A, an adjusting roller B, a telescopic adjusting shaft C, a sensing module, and a control module (not shown in the figure). Depending on the printing content, the roller surface of the impression roller A is equipped with a printing plate A01. The impression roller A absorbs printing ink and performs paperboard printing through the printing plate A01. The adjusting roller B is installed on one side of the impression roller A. It should be noted that in this embodiment, the adjusting roller B is a driven roller. The paperboard P to be printed passes between the impression roller A and the adjusting roller B under the drive of the driving roller D. The adjusting roller B pushes the paperboard P against the roller surface of the impression roller A, i.e., the adjusting roller B is used to adjust the printing pressure. Specifically, the telescopic adjusting shaft C is installed on both sides of the adjusting roller B. The telescopic adjusting shaft C is controlled by a motor to extend... The telescopic adjustment shaft C adjusts the position of the adjustment roller B to regulate the printing pressure. Specifically, the telescopic adjustment shaft C tightens or loosens the paperboard P to be printed against the impression roller A by extending and retracting the adjustment roller B. A sensing module is installed on the roller surface of the adjustment roller B. The sensing module is used to collect real-time data on the printing speed and printing pressure of the paperboard. The control module includes a data acquisition unit, a calculation unit, and a control adjustment unit. The data acquisition unit acquires real-time data collected by the sensing module, as well as information on the printing ink and the paperboard P to be printed. The calculation unit calculates the theoretical printing pressure based on the data acquired by the data acquisition unit. The control adjustment unit controls and adjusts the printing pressure based on the theoretical printing pressure calculated by the calculation unit and the real-time printing pressure acquired by the sensing module.

[0041] Specifically, in this embodiment, the sensing module includes multiple piezoelectric thin film sensors and an infrared counter. The multiple piezoelectric thin film sensors are distributed in a network along the axial direction of the adjusting roller B. The multiple piezoelectric thin film sensors are used to monitor the real-time printing pressure, that is, to monitor the contact pressure between the impression roller A, the adjusting roller B and the paperboard P to be printed. The infrared counter records the number of rotations of the adjusting roller B per unit time to calculate the printing speed.

[0042] In this embodiment, Figure 2 This is a flowchart illustrating the operation of a pressure compensation mechanism according to an embodiment of the present invention. Figure 2 As shown, the data acquisition unit acquires real-time data collected by the sensing module, as well as information data on the printing ink and the paperboard P to be printed, including:

[0043] The data collected in real time by the sensing module includes: real-time printing pressure. The number of rotations of adjusting roller B per unit time ;

[0044] Information data for printing ink and the paperboard P to be printed includes: ink viscosity The diameter of adjusting roller B .

[0045] Specifically, in this embodiment, the calculation unit calculates the theoretical printing pressure based on the data acquired by the data acquisition unit, including the following steps:

[0046] S1. Calculate printing speed:

[0047] The number of rotations of adjusting roller B per unit time is obtained from the sensing module. It can calculate printing speed. for: ,in, The printing speed is expressed as the amount of paperboard P to be printed passing through it per unit time by adjusting the rotation speed of roller B, and then further calculating the printing speed. ;

[0048] S2. Calculate the amount of printing ink transferred:

[0049] Ink transfer is the process by which ink fluid penetrates from the printing plate (printing plate A01) to the substrate (paperboard P to be printed) under printing pressure. According to Newton's theory of laminar flow between parallel plates, the amount of ink transferred per unit area is directly proportional to the printing pressure gradient and the contact time, i.e., the ink transfer amount. (Ink volume per unit area) and theoretical printing pressure and contact time The relationship can be represented as: ,in, Expressed as ink transfer amount, This is expressed as the printing ink transfer coefficient. Expressed as theoretical printing pressure, Indicated as contact time;

[0050] Specifically, contact time The contact arc length between the impression roller A and the paperboard P to be printed and printing speed The decision is based on kinematic formulas, specifically the contact time. With printing speed Inversely proportional: ,in, This is expressed as the contact arc length between the impression roller A and the paperboard P to be printed; further, we obtain: That is, when the printing quality is stable, the amount of ink transferred is obtained. Maintain constant theoretical printing pressure and printing speed There is a positive correlation, that is, printing speed Increasing theoretical printing pressure The printing speed will increase synchronously, which is understandable. During acceleration, the contact time between the impression roller A and the paperboard P to be printed is... Reduced amount of ink transferred If the ink density is insufficient, the ink color will become lighter. In this case, it is necessary to increase the printing pressure to compensate for the ink density.

[0051] S3. Calculate the effect of printing speed on theoretical printing pressure:

[0052] At low printing speeds, the deformation of the material (paperboard P to be printed) is primarily static, and the printing pressure is mainly determined by overcoming the elastic deformation of the material. As the printing speed increases, the dynamic response of the material may change. For example, at high speeds, the material may exhibit greater rigidity or inertial effects. Therefore, an additional pressure term proportional to the speed needs to be introduced to account for the influence of printing speed on the theoretical printing pressure. That is, the pressure correction value is expressed as: ,in, This is expressed as the speed effect value of theoretical printing pressure. Represented as static pressure, Expressed as the velocity-pressure coefficient, velocity-pressure coefficient It represents the pressure increment caused by a unit increase in velocity, and is related to the dynamic mechanical properties of the material (such as elastic modulus, damping, etc.).

[0053] S4. Calculate the effect of printing speed on printing ink:

[0054] Printing speed When the viscosity increases, the ink temperature rises due to friction and shear heat, leading to a decrease in ink viscosity. Reduce ink viscosity. Reducing the ink transfer rate makes it easier to transfer ink; therefore, in order to maintain the same ink transfer volume... To avoid ink splatter or blurred dots, it is necessary to adjust the printing pressure and ink viscosity. It decreases as temperature increases, and the increase in temperature is related to printing speed. Related (printing speed) Increasing the shear rate leads to increased heat generation, thus increasing the ink viscosity. The change can be expressed in exponential form as: ,in, This is expressed as the speed effect value of ink viscosity. Expressed as the ink viscosity attenuation coefficient;

[0055] Specifically, the ink transfer coefficient in printing is typically... With ink viscosity Inversely proportional to ink viscosity The lower the value, the easier the ink transfers; this is known as the printing ink transfer coefficient. With ink viscosity The relationship is: ,in, Let the initial value of the ink transfer coefficient be denoted as , and substituting it into the equation yields: Ink transfer amount Keeping it constant, we further obtain: , ,in, The value representing the effect of ink on theoretical printing pressure is expressed as follows. Represented as a constant;

[0056] S5. Calculate the correction value for the theoretical printing pressure:

[0057] Combining the effects of printing pressure on speed and ink, the corrected value for the theoretical printing pressure is expressed as follows: ,in, This is expressed as a correction value for the theoretical printing pressure.

[0058] Specifically, in this embodiment, the control and adjustment unit adjusts the printing pressure based on the theoretical printing pressure calculated by the calculation unit. Real-time printing pressure obtained by the sensing module Controlling and adjusting printing pressure includes:

[0059] No adjustment of printing pressure is performed;

[0060] Adjust printing pressure and control the reduction of printing pressure;

[0061] Adjust the printing pressure and control the increase of printing pressure;

[0062] That is, the allowable error is 5%.

[0063] Specifically, based on the steps described above, this embodiment provides a specific application scenario:

[0064] In one embodiment of the color box production line:

[0065]

[0066] calculate:

[0067] ;

[0068] That is, the control and adjustment unit calculates the theoretical printing pressure based on the calculation unit. Real-time printing pressure obtained by the sensing module Controlling and adjusting printing pressure includes:

[0069] No adjustment of printing pressure is performed;

[0070] Adjust printing pressure and control the reduction of printing pressure;

[0071] Adjust printing pressure and control the increase of printing pressure.

[0072] In this embodiment, another aspect provides a paperboard printing apparatus, which includes a pressure compensation mechanism as described above.

[0073] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pressure compensation mechanism, characterized by, The application relates to a printing device for paperboard printing, which comprises the following parts: a printing roller, the roller surface of which is provided with a printing plate for absorbing printing ink and printing paperboard; an adjusting roller, which is installed on one side of the printing roller, and the paperboard to be printed passes through the middle of the printing roller and the adjusting roller, and the adjusting roller pushes the paperboard to be printed against the roller surface of the printing roller to adjust the printing pressure; telescopic adjusting shafts, which are installed on both sides of the adjusting roller, and the telescopic adjusting shafts are controlled by a motor to adjust the position of the adjusting roller to adjust the printing pressure; a sensing module, which is installed on the roller surface of the adjusting roller and can collect the printing speed and the printing pressure of the paperboard in real time; a control module, which comprises a data acquisition unit, a calculation unit and a control adjusting unit: The data acquisition unit is used for acquiring data collected by the sensing module in real time and information data of printing ink and paperboard to be printed, including real-time printing pressure collected by the sensing module in real time and the number of rotations of the adjusting roller per unit time , and ink viscosity of the printing ink and the diameter of the adjusting roller ​ the calculation unit calculates the theoretical printing pressure according to the data collected by the data acquisition unit, and the calculation unit specifically comprises the following steps: The printing speed is calculated as: wherein, is expressed as the printing speed; The amount of printing ink transfer is calculated as: wherein, is expressed as the amount of ink transfer, is expressed as the printing ink transfer coefficient, is expressed as the theoretical printing pressure, is expressed as the contact arc length of the impression roller with the printing paperboard; The effect of the printing speed on the theoretical printing pressure is calculated: wherein, the speed effect on the theoretical printing pressure is expressed as the static pressure is expressed as the speed pressure coefficient is expressed as The effect of the printing speed on the printing ink is calculated: wherein, the ink impact value expressed as the theoretical printing pressure, the ink transfer efficiency constant expressed as, the ink viscosity decay coefficient expressed as; a correction value of the theoretical printing pressure is calculated: wherein, is a correction value of the theoretical printing pressure; the control adjusting unit controls and adjusts the printing pressure according to the theoretical printing pressure calculated by the calculation unit and the real-time printing pressure collected by the sensing module.

2. A pressure compensating mechanism according to claim 1, wherein the sensing module comprises: a plurality of piezoelectric film sensors, which are distributed in a network along the axial direction of the adjusting roller, and are used for recording the printing pressure; an infrared counter, which is used for recording the rotating circle number of the adjusting roller in unit time and calculating the printing speed.

3. A pressure compensating mechanism according to claim 2, wherein the control adjusting unit controls and adjusts the printing pressure according to the theoretical printing pressure calculated by the calculation unit and the real-time printing pressure collected by the sensing module, and the control adjusting unit specifically comprises the following steps: : no adjustment of the printing pressure; : adjust the printing pressure, control the reduction of the printing pressure; : Adjust print pressure, control to increase print pressure.

4. A paperboard printing apparatus characterized by, a pressure compensation mechanism as claimed in claim 3 is comprised.

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