A rotary screen printing process

Abstract

The application relates to a rotary screen printing process, which comprises the following steps: step one: rotating a printing substrate placed on a rotary screen printing machine to a printing station; step two: positioning the printing substrate rotated to the printing station; step three: performing pattern printing on the printing substrate by a screen printing assembly, so as to obtain a printing substrate printed with pattern information; step four: rotating the printing substrate printed with the pattern information to a detection station for detection, so as to obtain a detected printing substrate; and step five: rotating the detected printing substrate to a discharging station. The application positions and detects the printing substrate on the rotary screen printing machine, so that the situation that the printing yield is not high is avoided to the maximum extent, the positioning mode is more accurate, the yield after detection is higher, and the application has a good application prospect in a use scene with relatively high printing requirements.

Description

Technical Field

[0001] This application relates to the field of screen printing technology, and in particular to a rotary screen printing process. Background Technology

[0002] Screen printing refers to the process of creating a screen printing plate with images and text using a photosensitive method. Screen printing consists of five main elements: the screen printing plate, the squeegee, the ink, the printing table, and the substrate. It utilizes the basic principle that ink can pass through the mesh openings of the screen printing plate in the image areas, while ink cannot pass through the openings in the non-image areas. During printing, ink is poured into one end of the screen printing plate, and the squeegee applies pressure to the ink areas while moving at a constant speed towards the other end. As it moves, the ink is forced through the mesh openings in the image areas onto the substrate.

[0003] Existing screen printing technology offers high printing efficiency, but it often fails to maintain consistent printing quality, especially when high quality requirements are demanded, frequently falling short of user expectations. Summary of the Invention

[0004] Therefore, it is necessary to provide a rotary screen printing process to address the issue that the printing quality in existing technologies cannot meet the required standards. The technical solution of this application is: a rotary screen printing process, comprising the following steps:

[0005] Step 1: Rotate the substrate placed on the rotary screen printing machine to the printing station;

[0006] Step 2: Position the substrate that has been rotated to the printing station;

[0007] Step 3: The screen printing component prints the pattern onto the substrate, resulting in a substrate with the printed pattern information.

[0008] Step 4: Rotate the substrate with the printed pattern information to the inspection station for inspection, and obtain the inspected substrate;

[0009] Step 5: Rotate the inspected substrate to the unloading station.

[0010] Preferably, the method for positioning the substrate rotated to the printing station includes:

[0011] A first marker is set at the printing station, and the position coordinates of the printing station are obtained through the first marker.

[0012] At least one second mark is set on the turntable of the rotary screen printing machine, and the rotation angle of the rotary screen printing machine is obtained through the second mark.

[0013] The coordinates of the center position of the rotary screen printing machine after rotation are fitted based on the rotation angle of the rotary screen printing machine.

[0014] Calculate the difference between the coordinates of the center position after rotation and the coordinates of the printing station position;

[0015] The positioning of the substrate at the printing station is adjusted based on the result of the difference calculation.

[0016] Preferably, the method for positioning and adjusting the substrate located at the printing station includes:

[0017] A precision positioning system is installed at the printing station, which is capable of moving in any direction in the horizontal direction.

[0018] After calculating the difference between the center position coordinates after rotation and the position coordinates of the printing station, the precision positioning system adjusts the substrate in the horizontal direction to the specified position coordinates based on the difference.

[0019] Preferably, the method for rotating the substrate with printed pattern information to the inspection station for inspection includes:

[0020] Image information of the printed substrate is obtained through a visual inspection device;

[0021] Compare the image information of the printed substrate with the preset result of the printed substrate information;

[0022] After recording the comparison results, move the machine to the unloading station.

[0023] Preferably, the method for comparing the image information of the printed substrate with the preset result of the printed substrate information includes:

[0024] Construct an image recognition model of the printed substrate;

[0025] Pre-set a qualified printing substrate identifier in the image recognition model of the printed substrate;

[0026] The image information of the substrate is input into the image recognition model of the printed substrate for information comparison.

[0027] Preferably, the image information of the printed substrate obtained by the visual inspection device includes the color, pattern, characters, barcode, and marking code information of the printing station of the printed substrate.

[0028] Preferably, the substrate is rotated 90° from the printing station to the inspection station, and 90° from the inspection station to the unloading station.

[0029] Preferably, the precision positioning system is a rotary alignment platform.

[0030] Compared with the prior art, the advantages of this application are:

[0031] (1) This application avoids the occurrence of low printing yield by positioning and detecting the substrate on the rotary screen printing machine, and the whole control method has a fast response speed and higher precision.

[0032] (2) The positioning method set in this application has a clever structure and high positioning accuracy. The rotation trajectory identifies the center position and then judges the deviation from the mark code. The deviation position calculated by this method has high accuracy and will be more accurate when positioning. It can ensure the printing quality of products with very high printing precision, such as anti-counterfeiting labels, and can still maintain good accuracy after the equipment has been running for a long time without the need for shutdown calibration.

[0033] (3) This application compares the image of the printed substrate with the data in the model trained by big data. Especially for complex patterns, which are difficult to identify by human visual inspection and have a high error rate of ordinary visual inspection, the proposed solution can make the comparison results more accurate and the response speed faster. Attached Figure Description

[0034] The present application will be further described below with reference to the accompanying drawings and embodiments:

[0035] Figure 1 This is a schematic diagram illustrating an application scenario of the rotary screen printing process described in this application;

[0036] Figure 2 This is a schematic diagram of the process of a rotary screen printing process described in this application;

[0037] Figure 3 This is a schematic diagram of a method for positioning the substrate at the printing station in a rotary screen printing process as described in this application.

[0038] Figure 4 This is a schematic diagram of the process for detecting a substrate with printed pattern information in a rotary screen printing process described in this application.

[0039] The station includes: 1. Loading station, 2. Screen printing station, 3. Inspection station, 4. Unloading station, and 5. Visual inspection device. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are merely one embodiment of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0041] The term "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of this application. In the description of the embodiments of this application, it should be understood that the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," and "third," etc., may explicitly or implicitly include one or more of that feature. Furthermore, the terms "first," "second," and "third," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Moreover, the terms "comprising" and "being," and any variations thereof, are intended to cover non-exclusive inclusion.

[0042] like Figure 1 As shown in the diagram, this application provides a schematic diagram of an application scenario for a rotary screen printing process, including a rotary screen printing machine. The rotary screen printing machine includes four stations: a feeding station 1, a screen printing station 2, an inspection station 3, and a unloading station 4. A visual inspection device 31 is provided at the inspection station. In one embodiment of this application, the rotary screen printing machine can be used to screen print on packaging paper, paperboard, and other substrates used for packaging.

[0043] like Figure 2 As shown, the rotary screen printing process provided in this application includes the following steps:

[0044] Step 1: Rotate the substrate to the printing station;

[0045] Specifically, the substrate enters the rotary screen printing machine through the feeding mechanism. The substrate can be a packaging substrate such as cardboard or packaging paper. After entering the rotary screen printing machine, the substrate is rotated from the feeding station to the screen printing station by the rotation mechanism. In one embodiment of this application, each 90° rotation of the rotary screen printing machine constitutes one station. After each station is rotated, the substrate enters the next station. The order of execution of each station is as follows: feeding station, screen printing station, inspection station, and unloading station.

[0046] Step 2: Position the substrate at the printing station;

[0047] Specifically, after the substrate rotates to the printing station, errors will occur in the control precision and tolerance during the rotation of the rotary screen printing machine. These errors will lead to printing defects such as misalignment and missing parts in the printed product. Therefore, a positioning system is set up at the printing station to perform precise positioning of the rotating printing station. The positioning method includes the following steps:

[0048] Step 201: A first marker code is set at the printing station, and the position coordinates of the printing station are obtained through the first marker code;

[0049] Specifically, a first marker code is set on the printing station. The first marker code is an identification code carrying position information. The first marker code is used to obtain the position coordinates of the printing station in real time through fiber optic sensors and upload them to the control system.

[0050] Step 202: Set at least one second mark on the turntable of the rotary screen printing machine, and obtain the rotation angle of the rotary screen printing machine through the second mark;

[0051] Specifically, at least one second marker is set on the turntable of the rotary screen printing machine. The marker records the rotation angle of the turntable in real time during the rotation of the rotary screen printing machine. In this embodiment, there are 3 second markers. The rotation position data of the 3 second markers are collected in real time by sensors and uploaded to the system. The system server records the rotation angle trajectory of the rotary screen printing machine.

[0052] Step 203: Fit the coordinates of the center position of the rotary screen printing machine after it rotates based on the rotation angle of the rotary screen printing machine;

[0053] Specifically, the server fits the rotation trajectory of the rotary screen printing machine based on the rotation angle trajectory of the rotary screen printing machine. This rotation trajectory is a circular rotation trajectory, and the coordinates of the center position of the rotation are calculated based on the circular rotation trajectory.

[0054] Step 204: Calculate the difference between the coordinates of the center position after rotation and the coordinates of the printing station position;

[0055] Specifically, the server calculates the difference between the center coordinates of the rotation trajectory of the rotary screen printing machine and the position coordinates of the first marker code, and calculates the position deviation data between the printing station position coordinates and the target printing station position coordinates after the screen printing machine rotates.

[0056] Step 205: Adjust the positioning of the substrate located at the printing station based on the result of the difference calculation.

[0057] Specifically, a precision positioning system is installed at the printing station. The precision positioning system can move horizontally, such as in the front, back, left, and right directions. After calculating the difference between the center position coordinates of the rotary screen printing machine after rotation and the position coordinates of the positioning code, the precision positioning system adjusts the substrate horizontally to the specified position coordinates based on the difference.

[0058] Step 3: The screen printing component prints the pattern onto the cardboard to obtain a substrate with the printed pattern information;

[0059] Specifically, for materials rotated to the screen printing station, the screen printing assembly applies a certain pressure to the ink area on the screen printing plate using a squeegee, while moving at a uniform speed towards the other end of the screen printing plate to print the printing paste onto the substrate.

[0060] Step 4: Rotate the substrate with the printed pattern information to the inspection station for inspection;

[0061] Specifically, the substrate with printed pattern information is moved to the inspection station by the rotation of the rotating mechanism. The vision inspection device set above the inspection station takes a picture of the substrate with printed pattern information to obtain the image information of the substrate with printed pattern information. The image information is compared with the printed substrate information of the preset result stored in the server. If the comparison is consistent with the preset result, it is judged as qualified; otherwise, it is judged as unqualified.

[0062] Step 5: Rotate the inspected substrate to the unloading station.

[0063] Specifically, the printed substrate after inspection in step 4 is transferred to the unloading station by the rotation mechanism. At the unloading station, the qualified printed substrate is transferred to the next station, and the unqualified printed substrate is sorted into NG products by the material handling device.

[0064] Furthermore, the method for comparing the image information of the printed substrate with the preset result of the printed substrate information includes:

[0065] Step 401: Construct an image recognition model of the printed substrate;

[0066] In this embodiment, the image recognition model of the printed substrate is a neural network model.

[0067] Step 402: Preset the qualified printing substrate identifier in the image recognition model of the printed substrate;

[0068] Specifically, in the neural network model, images of printed substrates that have passed printing are preset as qualified and correct substrate identifiers.

[0069] Step 403: Train the image of the substrate with printed pattern information;

[0070] Specifically, neural network models are used to train the substrates. For example, batches of printed substrates are input into the model and compared with preset results, so that the accuracy of model recognition is continuously improved.

[0071] Step 404: Input the information of the substrate with the printed pattern into the image recognition model for information comparison.

[0072] Furthermore, this application also provides a rotary screen printing process control system, characterized in that the control system includes a processor module and a memory module, wherein the memory module stores at least one instruction, at least one program, code set or instruction set, and the at least one instruction, the at least one program, the code set or instruction set is loaded and executed by the processor module to realize any of the above-mentioned rotary screen printing processes.

[0073] The above embodiments are merely illustrative of the technical concept and features of this application, intended to enable those skilled in the art to understand the content of this application and implement it accordingly, and should not be construed as limiting the scope of protection of this application. It is obvious to those skilled in the art that this application is not limited to the details of the above exemplary embodiments, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this application is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of the equivalents of the claims are intended to be included within this application.

Claims

1. A rotary screen printing process, characterized in that, Includes the following steps: Step 1: Rotate the substrate placed on the rotary screen printing machine to the printing station; Step 2: Position the substrate rotated to the printing station; the positioning method includes: setting a first mark code at the printing station, and obtaining the position coordinates of the printing station through the first mark code; At least one second mark is set on the turntable of the rotary screen printing machine, and the rotation angle of the rotary screen printing machine is obtained through the second mark. The coordinates of the center position of the rotary screen printing machine after rotation are fitted based on the rotation angle of the rotary screen printing machine. Calculate the difference between the coordinates of the center position after rotation and the coordinates of the printing station position; The positioning of the substrate at the printing station is adjusted based on the calculated difference; the methods for positioning the substrate at the printing station include: A precision positioning system is installed at the printing station, which is capable of moving in any direction in the horizontal direction. After calculating the difference between the coordinates of the center position after rotation and the coordinates of the printing station, the precision positioning system adjusts the substrate to the specified position coordinates in the horizontal direction based on the difference. Step 3: The screen printing component prints the pattern onto the substrate, resulting in a substrate with the printed pattern information. Step 4: Rotate the substrate with the printed pattern information to the inspection station for inspection, and obtain the inspected substrate; Step 5: Rotate the inspected substrate to the unloading station.

2. The rotary screen printing process according to claim 1, characterized in that, Methods for rotating a substrate with printed pattern information to an inspection station for inspection include: Image information of the printed substrate is obtained through a visual inspection device; Compare the image information of the printed substrate with the preset result of the printed substrate information; After recording the comparison results, rotate to the unloading station.

3. The rotary screen printing process according to claim 2, characterized in that, Methods for comparing the image information of the printed substrate with the preset result of the printed substrate information include: Construct an image recognition model of the printed substrate; Pre-set a qualified printing substrate identifier in the image recognition model of the printed substrate; The image information of the substrate is input into the image recognition model of the printed substrate for information comparison.

4. The rotary screen printing process according to claim 3, characterized in that, Image information of the printed substrate obtained through a visual inspection device includes the color, pattern, characters, barcode, and marking information of the printing station.

5. The rotary screen printing process according to claim 1, characterized in that, The substrate rotates 90° from the printing station to the inspection station and 90° from the inspection station to the unloading station.

6. The rotary screen printing process according to claim 1, characterized in that, The precision positioning system is a rotary alignment platform.

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