An electrostatic correction system for decorative paper

Abstract

This invention provides an electrostatic correction system for decorative paper, including a pressure roller and a printing roller. A first electrostatic device for providing positive charge is connected to the pressure roller, and a second electrostatic device for providing negative charge is connected to the printing roller. The ink trough on the printing roller is filled with ink containing magnetic fluorescent particles. The system also includes a detection box containing a vision camera. Furthermore, it includes an image acquisition module, a feature extraction module, a feature comparison module, and a control module. The image acquisition module acquires images of the printed surface of the decorative paper captured by the vision camera. The feature extraction module extracts the distribution information of fluorescent particles from the printed surface image. The feature comparison module compares the distribution information with theoretical information using a comparison strategy to obtain electrostatic output information. The control module controls the output of the first and second electrostatic devices based on the electrostatic output information, enabling precise correction of the charge input in advance to ensure printing uniformity.

Description

Technical Field

[0001] This invention relates to the field of decorative paper processing, and more specifically to an electrostatic correction system for decorative paper. Background Technology

[0002] Decorative paper is usually combined with substrates such as furniture boards, wall panels, door panels, and flooring to create decorative panels. Decorative paper makes decorative panels beautiful and smooth, and also has functions such as wear resistance, corrosion resistance, and water resistance. It is widely used in public places, medical environments, kindergartens, schools, and home environments.

[0003] Currently, decorative paper printing includes roller printing and electrostatic printing. Roller printing is a relatively traditional method with low efficiency and uneven printing patterns. Electrostatic printing, on the other hand, involves passing a positive charge onto the pressure roller, which is then conducted to the decorative paper. Meanwhile, a negative charge is passed onto the printing roller, where the negatively charged ink in the ink trough is attracted by the positive charge on the decorative paper, achieving uniform printing. However, electrostatic printing requires strict control over the amount of positive and negative charge applied, as different charges produce different printing effects. Therefore, the amount of charge input needs to be precisely corrected beforehand. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an electrostatic correction system for decorative paper. This electrostatic correction system for decorative paper can accurately correct the amount of charge input in advance to ensure the uniformity of printing.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An electrostatic correction system for decorative paper includes a pressure roller and a printing roller. A first electrostatic device for providing positive charge is connected to the pressure roller, and a second electrostatic device for providing negative charge is connected to the printing roller. The decorative paper passes between the pressure roller and the printing roller. The ink trough on the printing roller is filled with ink containing magnetic fluorescent particles. The system also includes a detection box. The decorative paper is conveyed to the detection box via a transfer roller assembly. The detection box includes a vision camera.

[0007] It also includes an image acquisition module, a feature extraction module, a feature comparison module, and a control module. The image acquisition module is used to acquire images of the printed surface of the decorative paper captured by the vision camera. The feature extraction module is used to extract the distribution information of fluorescent particles in the printed surface image. The feature comparison module is used to analyze the distribution information and theoretical information through a comparison strategy to obtain electrostatic output information. The control module controls the output of the first electrostatic device and the second electrostatic device respectively according to the electrostatic output information.

[0008] Furthermore, the distribution information includes the distribution location of the fluorescent particles and the distribution quantity of the fluorescent particles.

[0009] Furthermore, the comparison strategy includes a region aggregation step, a feature statistics step, and an electrostatic positioning step;

[0010] The region aggregation step involves dividing the ink area corresponding to each ink tank according to the distribution location, and then outlining the fluorescent area in the ink area with a rectangular frame to obtain the calculation area.

[0011] The feature statistics step calculates the actual distribution of fluorescent particles based on the calculation region;

[0012] The electrostatic positioning step compares the actual distribution quantity with the theoretical distribution quantity in the theoretical information. If the two are the same, the corresponding electrostatic output information is located.

[0013] Furthermore, it also includes a distribution recording module, which is used to record the actual distribution under different electrostatic output information states and to draw a printing trend chart of the actual distribution under different electrostatic output information states.

[0014] Furthermore, the printing roller also includes an adjustment mechanism, which includes a drive component and several adjustment components. Each adjustment component is located in a corresponding ink trough. The drive component is used to drive the adjustment component to move so that the adjustment component changes the shape of the ink trough.

[0015] Furthermore, the ink tank is provided with a through hole communicating with the inner cavity of the printing roller. The adjusting component includes a pull member and two sets of deformation members. Both sets of deformation members are slidably connected in the ink tank to form a V-shape. One end of the pull member passes through the through hole and is rotatably connected to the deformation member. The driving component includes a roller shaft and a driving shaft. The roller shaft is provided with several through holes. The roller shaft is sleeved outside the driving shaft. The other end of the pull member passes through the through holes and is connected to the driving shaft. The driving shaft is also provided with a locking member for locking or disengaging the driving shaft from the roller shaft.

[0016] Furthermore, the distribution recording module includes a distribution recording submodule, which records the actual distribution of ink tank under different shapes based on the electrostatic output information, and draws an optimization trend diagram of the actual distribution of ink tank under different shapes.

[0017] Furthermore, it also includes a feedback module, which acquires the ink area and uses a feedback strategy to determine whether the actual distribution position of the fluorescent particles exceeds the theoretical distribution position. If it exceeds the threshold, the electrostatic output information is corrected.

[0018] Furthermore, the feedback strategy includes a region overlap step, a feature marking step, and a region determination step;

[0019] The region overlap step involves covering the ink region onto the theoretical region in the theoretical information to obtain an overlap map.

[0020] The feature marking step uses the position of the region calculated from the overlapping map marking on the theoretical region as the analysis region.

[0021] Furthermore, the region determination step determines whether the feature object exceeds the theoretical region based on the analysis region.

[0022] Furthermore, the feedback strategy also includes a missing feature determination step, which compares the ink area and the calculation area to determine whether there is a missing feature area. If so, the electrostatic output information is corrected.

[0023] The beneficial effects of this invention are as follows: 1. By using ink with magnetic fluorescent particles for charge absorption printing on decorative paper, it is easier to observe the printing effect. Specifically, by controlling the positive charge of the pressure roller and the negative charge of the printing roller, and by detecting and analyzing the distribution and amount of magnetic fluorescent particles, the optimal charge output corresponding to the printing result can be selected. Compared with the existing method of randomly selecting output within the charge area, this invention can provide the optimal charge output according to the printing needs, thereby improving the uniformity of the printed ink.

[0024] 2. By adjusting the size and shape of the ink trough on the printing roller, the optimal ink trough shape can be selected according to different printing needs to match the best charge output. Compared with the uniform ink trough of the printing roller charge absorption, this invention allows the printing roller to undergo reasonable experiments before printing on the production line to give the optimal size and shape to match the subsequent printing. Attached Figure Description

[0025] Figure 1 This is an overall structural diagram of the present invention;

[0026] Figure 2 This is the control relationship diagram of the present invention;

[0027] Figure 3 This is a first cross-sectional view of the printing roller in this invention;

[0028] Figure 4 This is a partial structural diagram of the roller shaft in this invention;

[0029] Figure 5 This is a second cross-sectional view of the printing roller in this invention.

[0030] Auxiliary markings: 1. Pressure roller; 2. Printing roller; 3. Decorative paper; 4. Ink tank; 5. Transfer roller group; 6. Detection box; 7. Drive assembly; 71. Roller shaft; 72. Drive shaft; 73. Through port; 8. Adjustment assembly; 81. Pulling component; 82. Deformation component; 9. Locking component; 91. Locking disc; 92. Air expansion block; 93. Air passage; 10. Insertion port; 101. Image acquisition module; 102. Feature extraction module; 103. Feature comparison module; 104. Control module; 105. Distribution recording module; 106. Distribution recording sub-module; 107. Feedback module. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Identical components are denoted by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, and the terms "bottom surface," "top surface," "inner," and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0032] The electrostatic printing method involves applying a positive charge to the pressure roller 1, which is then conducted to the decorative paper 3. Conversely, a negative charge is applied to the printing roller 2, causing the negatively charged ink in the ink trough 4 on the printing roller 2 to be attracted by the positive charge on the decorative paper 3, achieving uniform printing. However, the magnitude of the applied positive and negative charges is relatively strictly controlled during electrostatic printing, as different charges result in different printing effects. Therefore, the amount of charge input needs to be precisely corrected beforehand. This invention designs an electrostatic correction system for the decorative paper 3, such as… Figure 1 As shown, the system includes a pressure roller 1 and a printing roller 2. The pressure roller 1 is connected to a first electrostatic device for providing positive charge, and the printing roller 2 is connected to a second electrostatic device for providing negative charge. Decorative paper 3 passes between the pressure roller 1 and the printing roller 2. An ink box is located under the printing roller 2. When the printing roller rotates, a portion of the ink box is always inside the ink box. The ink box contains ink with magnetic fluorescent particles. When the printing roller 2 rotates, the ink trough 4 is filled with ink containing magnetic fluorescent particles. The system also includes a detection box 6, which is dark inside. The detection box 6 has a paper inlet and a paper outlet at both ends. The decorative paper 3 is conveyed from the paper inlet to the detection box 6 through a transfer roller group 5. The detection box 6 includes a vision camera facing the printing surface of the decorative paper 3. The transfer roller group 5 consists of two sets of transfer rollers arranged vertically. The two ends of the transfer rollers have transfer wheels. The two sides of the decorative paper 3 have gaps. The transfer wheels are located on the gaps and will not press against the ink pattern just printed on the decorative paper 3.

[0033] like Figure 2As shown, it also includes an image acquisition module 101, a feature extraction module 102, a feature comparison module 103, and a control module 104. The image acquisition module 101 is used to acquire the printed surface image of the decorative paper 3 captured by the vision camera. The printed surface image is a black background image, which includes a region containing fluorescent particles. The feature extraction module 102 is used to extract the distribution information of fluorescent particles in the printed surface image. The distribution information includes the distribution location and the distribution quantity of fluorescent particles. The feature comparison module 103 is used to analyze the distribution information and theoretical information through a comparison strategy to obtain electrostatic output information. The electrostatic output information includes the amount of positive charge and the amount of negative charge. The control module 104 controls the output of the first electrostatic device and the second electrostatic device respectively according to the electrostatic output information.

[0034] Example 1:

[0035] The comparison strategy includes a region aggregation step, a feature statistics step, and an electrostatic positioning step;

[0036] The area aggregation step divides the ink area corresponding to each ink tank 4 according to the distribution location. The charge adsorption printing adsorbs the ink in the ink tank 4 onto the decorative paper 3. Then, the printing surface of the decorative paper 3 will have mutually separated printing areas, which are the ink areas. The magnetic fluorescent particles are mixed in the ink. The area formed by the fluorescent particles in the ink area is framed in the form of a rectangle to obtain the calculation area. When the fluorescent particles are small, theoretically the ink area is completely filled with fluorescent particles, that is, the calculation area framed in the form of a rectangle is the ink area. When the fluorescent particles are large, the fluorescent particles in the ink area are roughly framed in the form of a rectangle as the calculation area.

[0037] The feature statistics step involves calculating the area of ​​the region formed by fluorescent particles based on the calculation area. Assuming that n rectangular regions are defined, the area value of each rectangular region is calculated first, and then the areas are added together to obtain the total area value.

[0038] The electrostatic positioning step compares the calculated fluorescence area with the fluorescence area in the theoretical information. If they are the same, the corresponding electrostatic output information is located. This method obtains the optimal electrostatic output information by comparing the actual detection value with the theoretical value. Its advantage is that it can set the corresponding theoretical model according to different printing requirements, and can quickly match the corresponding model, saving testing time.

[0039] Example 2:

[0040] Based on Embodiment 1, a distribution recording module 105 is also included. The distribution recording module 105 is used to record the actual distribution under different electrostatic output information states. The electrostatic output information has a range, that is, the corresponding fluorescence area can be calculated under each value of electrostatic output. The fluorescence area is recorded one-to-one with the electrostatic output, and a printing trend chart of the actual distribution under different electrostatic output information states is drawn. The printing trend chart is a linear graph, which can more intuitively show the maximum value of fluorescence area under a certain electrostatic output information. Its beneficial effect is that the best value can be selected from the range, avoiding the error in selecting the best value due to model errors, and making the selection of the best electrostatic value more accurate.

[0041] Example 3:

[0042] Based on Embodiment 1 or Embodiment 2, the printing roller 2 also includes an adjustment mechanism, such as... Figure 3-5 As shown, the adjustment mechanism includes a drive assembly 7 and several adjustment assemblies 8. Each adjustment assembly 8 is located in a corresponding ink tank 4. The drive assembly 7 is used to drive the adjustment assembly 8 to move so that the adjustment assembly 8 changes the shape of the ink tank 4.

[0043] Specifically, the ink tank 4 is a U-shaped tank. A through hole communicating with the inner cavity of the printing roller 2 is provided at the center of the bottom of the ink tank 4. The through hole is arranged along the length of the ink tank 4. The adjusting assembly 8 includes a pull member 81 and two sets of deformable members 82 (metal sheets). The pull member 81 can be a metal sheet or a metal rope. Both sets of deformable members 82 are slidably connected within the ink tank 4 to form a V-shape. One end of the pull member 81 passes through the through hole and is rotatably connected to the deformable member 82. The driving assembly 7 includes a roller shaft 71 and a driving shaft 72. The roller shaft 71 has several through-holes 73. The roller shaft 71 is sleeved outside the driving shaft 72. The other end of the pull member 81 passes through the through-holes 73 and is connected to the driving shaft 72. The driving shaft 72 also has a connection for connecting the driving shaft 72 and the roller shaft 71. The locking or unlocking fastener 9 includes a locking disc 91 with an air chamber inside. The outer surface of the locking disc 91 is provided with several slidable air expansion blocks 92. The drive shaft 72 is provided with an air passage 93 that communicates with the air chamber. The roller shaft 71 is provided with a socket 10 that mates with the air expansion blocks 92. Under normal conditions, the air expansion blocks 92 extend out of the locking disc 91 and are inserted into the socket 10. The drive shaft 72 and the roller shaft 71 rotate synchronously. When the printing roller 2 rotates at a certain angle, it is necessary to adjust the size of the ink tank 4. The air expansion blocks 92 are then pneumatically drawn into the locking disc 91, and the air expansion blocks 92 disengage from the socket 10. The drive shaft 72 separates from the roller shaft 71. When the drive shaft 72 rotates at a certain angle, it will pull the puller 81 to change the shape of the ink tank 4.

[0044] By adjusting the size and shape of the ink trough 4 on the printing roller 2, the optimal shape of the ink trough 4 can be selected according to different printing needs to match the optimal charge output. Compared with the uniform charge absorption of the printing roller 2 with ink trough 4, this invention enables the printing roller 2 to undergo reasonable experiments before printing on the production line to provide the optimal size and shape to match subsequent printing.

[0045] like Figure 2 As shown, the distribution recording module 105 includes a distribution recording submodule 106. The distribution recording submodule 106 records the actual distribution of ink tank 4 under different shapes based on the electrostatic output information, and plots an optimization trend diagram of the actual distribution of ink tank 4 under different shapes. The optimization trend diagram is a linear graph, which can more intuitively show the maximum value of fluorescence area under a certain electrostatic output information and a certain shape of ink tank 4. Its beneficial effect is that it can select the best from the range, avoid the error in selecting the best value due to model errors, and make the selection of the electrostatic optimal value more accurate. When the output of positive charge and negative charge is determined, the shape and size of ink tank 4 are adjusted to select the optimal state of ink tank 4.

[0046] like Figure 2 As shown, if the output of positive and negative charges is too small, the ink area of ​​the decorative paper 3 will be partially missing during charge printing. If the output of positive and negative charges is too large, the ink area of ​​the decorative paper 3 will overflow during charge printing. Therefore, a feedback module 107 is also included. The feedback module 107 obtains the ink area and uses a feedback strategy to determine whether the actual distribution position of the fluorescent particles exceeds the theoretical distribution position. If it exceeds the threshold, the electrostatic output information is corrected.

[0047] Specifically, the feedback strategy includes a region overlap step, a feature marking step, and a region determination step;

[0048] The region overlap step involves covering the ink region onto the theoretical region in the theoretical information to obtain an overlap map.

[0049] In the feature marking step, the position of the area marked on the overlay map on the theoretical area is used as the analysis area. If the ink area completely covers and exceeds the theoretical area, then the analysis area in the overlay map is the area that exceeds the theoretical area.

[0050] The region determination step involves determining whether the feature object exceeds the theoretical region based on the analyzed region.

[0051] The feedback strategy also includes a missing detection step, which compares the ink area and the calculation area to determine whether there are missing feature areas. If so, it indicates that the output of positive and negative charges is too small and the electrostatic output information needs to be corrected.

[0052] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An electrostatic correction system for decorative paper, comprising a pressure roller (1) and a printing roller (2), wherein a first electrostatic device for providing positive charge is connected to the pressure roller (1), and a second electrostatic device for providing negative charge is connected to the printing roller (2), wherein decorative paper (3) passes between the pressure roller (1) and the printing roller (2), characterized in that: The ink trough (4) on the printing roller (2) is filled with ink containing magnetic fluorescent particles, and also includes a detection box (6). The decorative paper (3) is conveyed to the detection box (6) through the transfer roller group (5). The detection box (6) includes a vision camera. It also includes an image acquisition module (101), a feature extraction module (102), a feature comparison module (103), and a control module (104). The image acquisition module (101) is used to acquire the printed surface image of the decorative paper (3) captured by the visual camera. The feature extraction module (102) is used to extract the distribution information of fluorescent particles in the printed surface image. The feature comparison module (103) is used to analyze the distribution information and theoretical information through a comparison strategy to obtain electrostatic output information. The control module (104) controls the output of the first electrostatic device and the second electrostatic device respectively according to the electrostatic output information. The distribution information includes the distribution location and the distribution quantity of fluorescent particles; The comparison strategy includes a region aggregation step, a feature statistics step, and an electrostatic positioning step. The area aggregation step involves dividing the ink area corresponding to each ink trough (4) according to the distribution location, and then outlining the fluorescent area in the ink area with a rectangular frame to obtain the calculation area. The feature statistics step calculates the actual distribution of fluorescent particles based on the calculation region; The electrostatic positioning step compares the actual distribution quantity with the theoretical distribution quantity in the theoretical information. If the two are the same, the corresponding electrostatic output information is located.

2. The electrostatic correction system for decorative paper according to claim 1, characterized in that: It also includes a distribution recording module (105), which is used to record the actual distribution under different electrostatic output information states and draw a printing trend chart of the actual distribution under different electrostatic output information states.

3. The electrostatic correction system for decorative paper according to claim 2, characterized in that: The printing roller (2) also includes an adjustment mechanism, which includes a drive component (7) and several adjustment components (8). Each adjustment component (8) is located in a corresponding ink trough (4). The drive component (7) is used to drive the adjustment component (8) to move so that the adjustment component (8) changes the shape of the ink trough (4).

4. The electrostatic correction system for decorative paper according to claim 3, characterized in that: The ink tank (4) is provided with a through hole communicating with the inner cavity of the printing roller (2). The adjustment component (8) includes a pull member (81) and two sets of deformation members (82). The two sets of deformation members (82) are slidably connected in the ink tank (4) to form a V shape. One end of the pull member (81) passes through the through hole and is rotatably connected to the deformation member (82). The drive component (7) includes a roller shaft (71) and a drive shaft (72). The roller shaft (71) is provided with several through holes (73). The roller shaft (71) is sleeved outside the drive shaft (72). The other end of the pull member (81) passes through the through holes (73) and is connected to the drive shaft (72). The drive shaft (72) is also provided with a locking member (9) for locking or disengaging the drive shaft (72) from the roller shaft (71).

5. The electrostatic correction system for decorative paper according to claim 4, characterized in that: The distribution recording module (105) includes a distribution recording submodule (106), which records the actual distribution of the ink tank (4) under different shapes according to the electrostatic output information, and draws an optimization trend diagram of the actual distribution of the ink tank (4) under different shapes.

6. The electrostatic correction system for decorative paper according to claim 5, characterized in that: It also includes a feedback module (107), which acquires the ink area and uses a feedback strategy to determine whether the actual distribution position of the fluorescent particles exceeds the theoretical distribution position. If it exceeds the threshold, the electrostatic output information is corrected.

7. The electrostatic correction system for decorative paper according to claim 6, characterized in that: The feedback strategy includes a region overlap step, a feature marking step, and a region judgment step. The region overlap step involves covering the ink region onto the theoretical region in the theoretical information to obtain an overlap map. The feature marking step uses the position of the region calculated from the overlapping map marking on the theoretical region as the analysis region. The region determination step determines whether the feature object exceeds the theoretical region based on the analysis region.

8. The electrostatic correction system for decorative paper according to claim 7, characterized in that: The feedback strategy also includes a missing feature determination step, which compares the ink area and the calculation area to determine whether there is a missing feature area. If so, the electrostatic output information is corrected.

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