Flat screen digital combined printing system and method

Abstract

The invention belongs to the technical field of industrial printing, and provides a flat screen and digital combined printing system and method.The flat screen and digital combined printing system comprises a flat screen printing system, a digital printing system, a conveying device and a control device.The flat screen printing system is used for coating to-be-printed base cloth with pretreatment slurry, and the amount of the pretreatment slurry is X / Y times of the average amount of printing slurry; the digital printing system is used for printing to-be-printed base cloth, the conveying device is used for conveying the to-be-printed base cloth to sequentially pass through the flat screen printing system and the digital printing system, the control device is connected with and controls the conveying device, so that the to-be-printed base cloth advances by a distance equal to X / Y of one printing layout of the flat screen printing machine every time, Y is an integer greater than 1, X is a factor of Y, and X is not equal to Y. According to the flat screen digital combined printing system and method, cracks between different times of sizing of the flat screen printing machine can be effectively removed, and high-quality printing of the digital printing machine is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of industrial printing, and in particular relates to a flat screen digital combined printing system and method. Background Art

[0002] To ensure optimal printing results with digital printing machines, the surface of the substrate to be printed is usually pre-treated with a pre-treatment slurry before the printing process. In industrial practice, this step is often completed with a sizing machine, which can evenly apply the pre-treatment slurry to the substrate to be printed, effectively ensuring the quality and durability of the print.

[0003] However, the industrial printing process often requires the use of multiple printing machines for combined printing, while the high cost and complex maintenance requirements of sizing machines pose a significant financial and technical burden for some small businesses. To address this issue, with the continuous advancement of technology, some companies are now using rotary screen printing machines and setting machines to replace sizing machines to complete the pre-treatment sizing process for the printed substrate. However, while the application of rotary screen printing machines and setting machines in this field has made some progress, a mature process for pre-treatment sizing using flat screen printing machines has not yet been established.

[0004] Currently, the most mature process involves first using a rotary screen printer to seamlessly apply a pre-treatment slurry to the substrate to be printed, followed by a digital printer for printing. However, this approach also faces challenges. Rotary screen printers are significantly more expensive than flat screen printers, and their application of the pre-treatment slurry is less effective and flexible than flat screen printers. Furthermore, when industrial printing machines are used in combination, rotary screen printers often operate at much higher speeds than digital and flat screen printers. Therefore, when a rotary screen printer is used in conjunction with a digital printer, the rotary screen printer's high efficiency may not be fully utilized, resulting in wasted resources and incompatible results.

[0005] Relatively speaking, the operating speeds of digital printers and flat screen printers are much closer. However, existing flat screen printers still face some challenges when applying the pretreatment slurry. Specifically, faint cracks often appear at the junctions between each printing position on a flat screen printer. These cracks can directly affect the subsequent printing results of digital printers, causing flaws or interruptions in the printed pattern. Therefore, resolving this sizing issue in flat screen printers and achieving seamless application of the pretreatment slurry remains a technical challenge that needs to be overcome.

[0006] The Chinese patent application with publication number C111703231A introduces a precise overprinting method for the fusion process of a digital printing machine and a flat screen printing machine. This method focuses particularly on combining a flat screen printing machine for pigment penetration treatment, and the digital printing machine for printing personalized patterns. However, this application has a significant limitation: it directly uses the substrate to be printed after the flat screen printing machine completes printing for subsequent digital printing processing. This approach cannot effectively solve the problem of crack connection caused by the flat screen printing machine in long-range digital printing operations. In particular, when the layout size of the digital printing is larger than that of the flat screen printing machine, the crack connection problem of the flat screen printing machine will significantly affect the final presentation effect of the digital printing, resulting in discontinuous or misaligned patterns, affecting the overall aesthetics and product quality.

[0007] Patent publication number CN112813704B discloses a highly efficient, high-precision flat-screen + digitally printed fabric production method that reduces energy consumption and emissions. The patent's core innovation lies in its introduction of a unique process for simultaneous sizing with a flat-screen printer. This process allows for targeted sizing at the exact location where the digital printer will print the pattern, thereby optimizing the printing process and improving production efficiency. While this patent offers improvements in energy conservation, emissions reduction, and production efficiency, it still fails to address the problem of cracked connections during printing.

[0008] During screen printing, due to the limited printing surface area, cracks inevitably appear at the junctions between different printing surfaces. These cracks can become a key factor affecting the printing results in subsequent digital printing processes, especially when high-precision overprinting or long-range continuous pattern printing is required. Summary of the Invention

[0009] In order to overcome the shortcomings of the existing technology, the present invention provides a flat screen digital combined printing system and method, which can effectively avoid the problem of crack connection between different sizing times of the flat screen printing machine and achieve high-quality printing of the digital printing machine.

[0010] The above-mentioned object of the present invention is achieved through the following technical solutions:

[0011] The present invention provides a flat screen digital combined printing system, comprising a flat screen printing system, a digital printing system, a conveying device, and a control device. The flat screen printing system is used to apply a pretreatment slurry to a substrate to be printed, where the amount of the pretreatment slurry is X / Y times the average amount of the printing slurry. The digital printing system is used to print the substrate to be printed. The conveying device is used to convey the substrate to be printed through the flat screen printing system and the digital printing system in sequence. The control device is connected to and controls the conveying device so that the substrate to be printed advances each time by a distance equivalent to a printing plate of the flat screen printing machine by X / Y, where Y is an integer greater than 1, X is a factor of Y, and X is not equal to Y.

[0012] According to one embodiment of the present invention, the flat screen printing system includes at least one flat screen printing machine, and the digital printing system includes at least one digital printing machine.

[0013] According to one embodiment of the present invention, the pre-treatment slurry includes printing slurry and an auxiliary agent.

[0014] According to one embodiment of the present invention, the auxiliary agent is a combination of one or more of an adhesive, a thickener, a softener, a curing agent, an antioxidant, and a hygroscopic agent.

[0015] According to one embodiment of the present invention, the average amount of printing paste is the average amount of paste or ink required for normal printing.

[0016] According to one embodiment of the present invention, the conveying device includes a motor, a gear and a conveyor belt. The output shaft of the motor is connected to the gear. The inner side of the conveyor belt is provided with gear teeth. The gear is engaged with the gear teeth. The motor is used to drive the gear, thereby driving the conveyor belt to transport the base cloth to be printed.

[0017] According to one embodiment of the present invention, the control device includes an industrial control computer and a distance measuring device. The industrial control computer is connected to the motor and is used to control the motor and then drive the conveyor belt to advance a distance equivalent to the X / Y distance of the printing plate of the flat screen printing machine each time. The distance measuring device is used to measure the length of the printing plate of the flat screen printing machine and the distance that the base cloth to be printed advances each time, and transmit the data to the industrial control computer.

[0018] According to one embodiment of the present invention, it also includes a leveling device, which is arranged at the front of the flat screen printing system. The leveling device includes a cloth feed rack and a weft straightener. The cloth feed rack is used to stably convey the base cloth to be printed to the weft straightener. The weft straightener is used to receive the base cloth to be printed conveyed by the cloth feed rack, and to monitor and adjust the weft state of the base cloth to be printed in real time when conveying the base cloth to be printed to the flat screen printing system.

[0019] The present invention also provides a flat screen digital combined printing method, comprising the following steps:

[0020] S1. Place the substrate to be printed on a conveying device, and allow the substrate to be printed to pass through a flat screen printing system under the drive of the conveying device;

[0021] S2, the conveying device stops conveying the substrate to be printed, and the flat screen printing system applies pretreatment slurry to the substrate to be printed. The amount of pretreatment slurry is X / Y times the average amount of printing slurry;

[0022] S3. After the pretreatment slurry of the flat screen printing system is applied, the control device controls the conveying device so that the substrate to be printed advances each time by a distance equivalent to the distance X / Y of the printing plate of the flat screen printing machine, where Y is an integer greater than 1, X is a factor of Y, and X is not equal to Y;

[0023] S4, the substrate to be printed will stop each time it moves forward. At this time, the flat screen printing system applies pre-treatment slurry to the substrate to be printed. The amount of pre-treatment slurry is X / Y times the average amount of printing slurry.

[0024] S5. After the substrate to be printed passes through the flat screen printing system, it is driven by the conveyor device to pass through the digital printing system, and the digital printing system prints the substrate to be printed;

[0025] S6. Repeat steps S3-S5 until the printing of the entire base fabric is completed.

[0026] The beneficial effects of the present invention compared with the prior art solutions are:

[0027] 1. This invention uses a flat screen printing machine instead of a rotary screen printing machine. By controlling the distance the substrate to be printed advances each time, it effectively eliminates the gaps between different sizing applications, thus achieving high-quality sizing. Compared to conventional rotary screen printing machines, flat screen printing machines can apply a more uniform pretreatment slurry and more precisely control the amount of slurry applied, enabling digital printers to achieve better printing results. This invention overcomes the last obstacle to industrial sizing on flat screen printing machines and significantly promotes the advancement of printing technology.

[0028] 2. This invention uses a flat screen printing machine to eliminate the gaps between different sizing cycles, a problem only achieved with traditional rotary screen or digital printing machines. This eliminates the cost of purchasing additional sizing machines, reducing the burden on businesses. Furthermore, while significantly reducing the cost of high-quality printing, this invention also expands the applications of flat screen printing machines, effectively resolving the issue of a large number of existing idle flat screen printing machines.

[0029] 3. The present invention sets the amount of pre-treated slurry to X / Y times the average amount of printing slurry, so that the volume of slurry finally applied to most of the substrates to be printed is Y / Y times the average amount of printing slurry, that is, the volume of slurry finally applied to the substrate to be printed is the average amount of slurry required for optimal printing.

[0030] 4. The final printed substrate obtained by the present invention has a uniform amount of pre-treated slurry, except for the uneven amount of pre-treated slurry at the front and rear ends (1-X / Y) printing plate distance. The amount of pre-treated slurry on the remaining portions of the substrate to be printed is uniform and equal to the printing slurry. If X is set to an integer less than Y, uneven slurry application will occur in the middle of the substrate to be printed, seriously affecting the subsequent printing operation of the digital printer. By setting X to a factor of Y, the present invention ensures a uniform amount of pre-treated slurry over the largest possible range of the substrate to be printed, thereby achieving the highest quality printing results. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of the process of a flat screen digital combined printing system provided by the present invention;

[0032] Figure 2 This is a schematic diagram of the first sizing process in Example 2 of the present invention;

[0033] Figure 3 This is a schematic diagram of the second sizing process in Example 2 of the present invention;

[0034] Figure 4 This is a schematic diagram of the sizing process completed in Example 2 of the present invention;

[0035] Figure 5 This is a schematic diagram of the first sizing process of Comparative Example 1 of the present invention;

[0036] Figure 6 This is a schematic diagram of the second sizing process in Comparative Example 1 of the present invention;

[0037] Figure 7 This is a schematic diagram of the sizing completion of Comparative Example 1 of the present invention;

[0038] Figure 2 The upper middle line indicates the range and relative position of the first sizing of the flat screen printing machine, and the lower line indicates the relative position of the base fabric to be printed; Figure 3 The lines in the upper middle represent the range and relative position of the first and second sizing of the flat screen printing machine, and the lines below represent the relative position of the substrate to be printed; Figure 4 The lines in the upper middle represent the range and relative position of each sizing process of the flat screen printing machine, and the lines below represent the relative position of the substrate to be printed. Figure 5 The upper middle line indicates the range and relative position of the first sizing of the flat screen printing machine, and the lower line indicates the relative position of the base fabric to be printed; Figure 6 The lines in the upper middle represent the range and relative position of the first and second sizing of the flat screen printing machine, and the lines below represent the relative position of the substrate to be printed; Figure 7 The lines in the upper middle represent the range and relative position of each sizing of the flat screen printing machine, and the lines below represent the relative position of the base fabric to be printed. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the embodiments described are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. The following is merely a conceptual description of the specific implementation methods of the present invention, and is not a limitation on the implementation methods of the present invention. Without departing from the design spirit of the present invention, any adjustments, equivalent substitutions, improvements, etc. made by those skilled in the art to the various details of the technical solution of the present invention should fall within the scope of protection determined by the claims of the present invention.

[0040] Example 1

[0041] The present invention provides a flat screen digital combined printing system comprising a flat screen printing system, a digital printing system, a conveying device, and a control device.

[0042] A flat screen printing system consists of at least one flat screen printing machine, which applies a pretreatment slurry to the substrate to be printed. This pretreatment slurry consists of a printing paste and additives. The printing paste is used to transfer the pigment from the subsequent digital printing machine to the substrate to be printed. Additives are used to improve the properties of the printing paste, enhance printing quality, control the printing process, impart specific functions to the substrate to be printed, and increase printing efficiency. Additives include adhesives, thickeners, softeners, curing agents, antioxidants, and hygroscopic agents. Binders help form a film around the printed pigment, ensuring a long-lasting, vibrant color that resists fading. Thickeners improve the fluidity and viscosity of the pigment, resulting in a richer and clearer print. Softeners adhere to natural or synthetic fibers, improving smoothness and strength, and enhancing the feel of the substrate to be printed. Curing agents strengthen the bond between the pigment and the fabric, securing the pigment to the surface and preventing fading. Antioxidants prevent the pigment from oxidizing rapidly in air, which can cause the color to dull or lose its luster. Desiccant can reduce the drying speed of printing paste and prevent the printing paste from drying out prematurely, thus ensuring the smooth progress of the printing process.

[0043] A digital printing system consists of at least one digital printer, which is used to print on the substrate. A digital printer uses a computer-controlled print head to spray specific colored pigments, directly printing the design onto fabric or other materials, achieving high-quality, high-precision printing. Through digital control, the digital printer can precisely control parameters such as print head position, speed, and spray volume. Because digital printing pigments are water-soluble, the substrate must be sizing before printing to ensure even and stable adhesion of the pigment.

[0044] The conveyor system consists of a motor, gears, and a conveyor belt. The motor's output shaft is connected to the gear, which drives the motor to rotate. The conveyor belt is equipped with gear teeth on the inside. The substrate to be printed is placed on the conveyor belt, and the gear meshes with the teeth. The rotation of the gear drives the gear teeth, which in turn drives the conveyor belt to transport the substrate to be printed through the flat screen printing system and the digital printing system.

[0045] The control device includes an industrial control computer, a computing device designed specifically for industrial environments. It features high reliability, high stability, and high real-time performance, enabling long-term stable operation in harsh industrial environments. The industrial control computer connects to and controls the motor, causing the conveyor belt to advance each time by a distance equivalent to the X / Y distance of the flat-screen printing machine's printing plate, where Y is an integer greater than 1, X is a factor of Y, and X is not equal to Y. By setting Y to an integer greater than 1, X to a factor of Y, and X not equal to Y (i.e., X is an integer less than Y), the conveyor belt advances each time by a distance less than the distance of one printing plate on the flat-screen printing machine. This ensures that the pretreatment slurry applied to the substrate by the flat-screen printing machine overlaps partially, thereby eliminating any joint cracks between the pretreatment slurry applications. By setting X as a factor of Y, it is possible to ensure that Y is always an integer multiple of X. This ensures that, except for the substrate to be printed at a distance of (1-X / Y) printing plates at the front and rear ends, the number of sizing applications by the flat screen printing machine to each portion of the substrate to be printed is the same, and the number of sizing applications is Y / X times. By setting the amount of pre-treatment slurry each time to be X / Y times the average amount of printing slurry, it is possible to ensure that, on the substrate to be printed after treatment, except for the substrate to be printed at a distance of (1-X / Y) printing plates at the front and rear ends, the amount of pre-treatment slurry applied to each portion of the substrate to be printed is the average amount of printing slurry.

[0046] The distance measuring device assists the industrial control computer. It measures the length of the printed surface after the first print on a flat-screen printing machine and transmits this data via electrical signals to the industrial control computer. Based on this data, the industrial control computer controls the operation of the motor, and thus the advancement of the substrate to be printed. During the advancement of the substrate, the distance measured by the distance measuring device adjusts the motor operation to ensure that the substrate advances precisely the X / Y distance of the flat-screen printing machine's printing surface each time.

[0047] The smoothing device is used to smoothly convey the substrate to be printed into the flat screen printing system. The smoothing device includes a feed frame and a weft straightener. The feed frame's primary function is to support, guide, and control tension on the substrate to be printed, ensuring it enters the subsequent processing steps in a stable and flat state, thereby improving production efficiency and product quality. The feed frame includes a support device, a spreading device, a tension adjustment device, and a web-correcting device. The support device comprises a support frame and guide rollers. The support frame provides stable support for the substrate and other equipment, while the guide rollers are mounted on the support frame and guide the substrate forward. The spreading device flattens the substrate and eliminates wrinkles and curls. The tension adjustment device adjusts the position between the guide rollers, controlling the tension of the substrate to prevent wrinkles or stretching. The web-correcting device adjusts the position of the substrate to prevent it from shifting during operation and falling off the guide rollers. The weft straightener includes a straight roller, a bending roller, a photoelectric sensor and a controller. The photoelectric sensor is used to monitor the weft state of the base fabric to be printed. The photoelectric sensor is used to emit sensing light to the base fabric to be printed, receive the reflected sensing light, and transmit the data of the reflected sensing light to the controller. The controller analyzes the data of the reflected sensing light and controls the straight roller and the bending roller to adjust the weft state of the base fabric to be printed.

[0048] Example 2

[0049] like Figure 2-4 As shown, in this embodiment, X is set to 1, Y is set to 3, the printing plate of the flat screen printing machine is 3m long, and the length of the substrate to be printed is 3 times the printing plate of the flat screen printing machine, that is, 9m long. The specific steps are:

[0050] S1. Place the substrate to be printed on a conveying device, and allow the substrate to be printed to pass through a flat screen printing system under the drive of the conveying device;

[0051] S2, the conveying device stops conveying the substrate to be printed, and the flat screen printing system applies pre-treatment slurry to the substrate to be printed. The amount of pre-treatment slurry is 1 / 3 times the average amount of printing slurry;

[0052] S3. After the flat screen printing system has finished applying the pre-treatment slurry, the control device controls the conveying device so that the substrate to be printed moves forward by a distance equivalent to 1 / 3 of the printing plate of the flat screen printing machine, that is, by 1 meter.

[0053] S4, the substrate to be printed will stop each time it moves forward, and the flat screen printing system will apply pre-treatment slurry to the substrate to be printed;

[0054] S5. After the substrate to be printed passes through the flat screen printing system, it is driven by the conveyor device to pass through the digital printing system, and the digital printing system prints the substrate to be printed;

[0055] S6. Repeat steps S3-S5 until the printing of the entire base fabric is completed.

[0056] like Figure 2 As shown, the flat screen printing machine applies pre-treatment slurry to 3 / 9 of the left side of the substrate to be printed for the first sizing, that is, the sizing operation is performed on a total of 3m of the substrate to be printed.

[0057] like Figure 3 As shown in the figure, since the base fabric to be printed has advanced 1m, the flat screen printing machine has starched a total of 4 / 9 of the distance on the left side of the base fabric to be printed for the first and second sizing processes, that is, the base fabric to be printed within a range of 4m has been starched, of which 1 / 3 of the distance on the left side of the base fabric to be printed has been starched, 2 / 3 of the distance from 1 / 9 to 3 / 9 of the left side has been starched, and 1 / 3 of the distance from 3 / 9 to 4 / 9 of the left side has been starched.

[0058] like Figure 4 As shown in the figure, after the flat screen printing machine finishes sizing, the leftmost 1 / 9 and the rightmost 1 / 9 of the substrate to be printed are coated with 1 / 3 of sizing, the range from 1 / 9 on the left to 2 / 9 on the left and the range from 1 / 9 on the right to 2 / 9 on the right are coated with 2 / 3 of sizing, and the range from 2 / 9 on the left to 2 / 9 on the right is coated with 3 / 3 of sizing, that is, the normal amount of pre-treatment sizing is applied.

[0059] From the final results, it can be seen that, except for the 2m at the far left and 2m at the far end, the amount of pre-treated slurry on the substrate to be printed is not the average amount of the printing slurry. The amount of pre-treated slurry in the middle 5m distance is the average amount of the printing slurry. When the distance between the substrate to be printed and the printing plate of the flat screen printing machine is long enough, the range where the amount of pre-treated slurry on the substrate to be printed is not the average amount of the printing slurry is negligible relative to the range where the amount of pre-treated slurry is the average amount of the printing slurry.

[0060] Comparative Example 1

[0061] The difference between this embodiment and embodiment 2 is that in this embodiment, X is an integer smaller than Y, but X is not a factor of Y.

[0062] like Figure 5-7 As shown, in this embodiment, X is set to 2, Y is set to 3, the printing plate length of the flat screen printing machine is 3m, and the length of the substrate to be printed is 3 times the printing plate length of the flat screen printing machine, that is, 9m. The specific steps are:

[0063] S1. Place the substrate to be printed on a conveying device, and allow the substrate to be printed to pass through a flat screen printing system under the drive of the conveying device;

[0064] S2, the conveying device stops conveying the base fabric to be printed, and the flat screen printing system applies pre-treatment slurry to the base fabric to be printed. The amount of pre-treatment slurry is 2 / 3 times the average amount of printing slurry;

[0065] S3, the flat screen printing system applies the pre-treatment slurry to complete the right side, and the control device controls the conveying device so that the substrate to be printed moves forward each time by a distance equivalent to 2 / 3 of the printing plate of the flat screen printing machine;

[0066] S4, the substrate to be printed will stop each time it moves forward, and the flat screen printing system will apply pre-treatment slurry to the substrate to be printed;

[0067] S5. After the substrate to be printed passes through the flat screen printing system, it is driven by the conveyor device to pass through the digital printing system, and the digital printing system prints the substrate to be printed;

[0068] S6. Repeat steps S3-S5 until the printing of the entire base fabric is completed.

[0069] like Figure 5 As shown, the flat screen printing machine applies pre-treatment slurry to 3 / 9 of the distance on the left side of the substrate to be printed for the first sizing, that is, a total of slurry equivalent to 2 / 3 of the average amount of printing slurry is applied to the substrate to be printed within a range of 3m.

[0070] like Figure 6 As shown, since the base fabric to be printed has advanced 2m, the flat screen printing machine has applied pre-treatment slurry to a total of 5 / 9 of the left side of the base fabric to be printed during the first and second sizing processes, that is, the base fabric to be printed within a range of 5m has been sizing, wherein 2 / 9 of the left side of the base fabric to be printed has been coated with slurry equivalent to 2 / 3 of the average amount of the printing slurry, the range from 2 / 9 to 3 / 9 of the left side has been coated with slurry equivalent to 4 / 3 of the average amount of the printing slurry, and the range from 3 / 9 to 5 / 9 of the left side has been coated with slurry equivalent to 2 / 3 of the average amount of the printing slurry.

[0071] like Figure 7 As shown, after the flat screen printing machine finishes sizing, the base fabric to be printed is coated with the pre-treatment slurry equivalent to 2 / 3 of the average amount of the printing slurry on the leftmost 2 / 9, the range between the left 3 / 9 and the left 4 / 9, the range between the left 5 / 9 and the left 6 / 9, and the range between the left 7 / 9 and the left 9 / 9, and the range between the left 2 / 9 and the left 3 / 9, the range between the left 4 / 9 and the left 5 / 9, and the range between the left 6 / 9 and the left 7 / 9 is coated with the pre-treatment slurry equivalent to 4 / 3 of the average amount of the printing slurry.

[0072] It can be seen from the final result that since X is not set as a factor of Y, Y is not an integer multiple of X, resulting in that the amount of pretreatment slurry finally applied on the substrate to be printed is not uniform.

[0073] The above-described embodiments are only preferred embodiments of the present invention, and are not intended to be all feasible embodiments of the present invention. Any obvious modifications made by a person skilled in the art without departing from the principles and spirit of the present invention should be considered to be included within the scope of protection of the claims of the present invention.

Claims

1. A flat screen digital joint printing system, characterized in that: The system comprises a flat screen printing system, a digital printing system, a conveying device, and a control device. The flat screen printing system is used to apply a pre-treatment slurry to the substrate to be printed. The amount of the pre-treatment slurry is X / Y times the average amount of the printing slurry. The digital printing system is used to print the substrate to be printed. The conveying device is used to convey the substrate to be printed through the flat screen printing system and the digital printing system in sequence. The control device connects and controls the conveying device so that the substrate to be printed moves forward each time by a distance equivalent to a printing plate X / Y of the flat screen printing machine, where Y is an integer greater than 1, X is a factor of Y, and X is not equal to Y.

2. A flat screen digital combined printing system according to claim 1, characterized in that: The flat screen printing system includes at least one flat screen printing machine, and the digital printing system includes at least one digital printing machine.

3. The flat screen digital combined printing system according to claim 1, characterized in that: The pretreatment slurry includes printing slurry and auxiliaries.

4. A flat screen digital combined printing system according to claim 3, characterized in that: The auxiliary agent is a combination of one or more of an adhesive, a thickener, a softener, a curing agent, an antioxidant, and a hygroscopic agent.

5. The flat screen digital combined printing system according to claim 1, characterized in that: The average amount of printing slurry is the average amount of slurry or ink required for normal printing.

6. The flat screen digital combined printing system according to claim 1, characterized in that: The conveying device includes a motor, gears and a conveyor belt. The output shaft of the motor is connected to the gear. The inner side of the conveyor belt is provided with gear teeth. The gears are engaged with the gear teeth. The motor is used to drive the gears, thereby driving the conveyor belt to transport the base cloth to be printed.

7. The flat screen digital combined printing system according to claim 6, characterized in that: The control device includes an industrial control computer and a distance measuring device. The industrial control computer is connected to the motor to control the motor and then drive the conveyor belt to advance a distance equivalent to the X / Y distance of the printing plate of the flat screen printing machine each time. The distance measuring device is used to measure the length of the printing plate of the flat screen printing machine and the distance that the base fabric to be printed advances each time, and transmit the data to the industrial control computer.

8. The flat screen digital combined printing device according to claim 1, characterized in that: It also includes a leveling device, which is arranged at the front of the flat screen printing system. The leveling device includes a cloth feed rack and a weft straightener. The cloth feed rack is used to stably transport the base cloth to be printed to the weft straightener. The weft straightener is used to receive the base cloth to be printed transported by the cloth feed rack, and to monitor and adjust the weft state of the base cloth to be printed in real time when transporting the base cloth to be printed to the flat screen printing system.

9. A flat screen digital combined printing method, using the device according to any one of claims 1 to 8, characterized in that: The steps include: S1. Place the substrate to be printed on a conveying device, and allow the substrate to be printed to pass through a flat screen printing system under the drive of the conveying device; S2, the conveying device stops conveying the substrate to be printed, and the flat screen printing system applies pretreatment slurry to the substrate to be printed. The amount of pretreatment slurry is X / Y times the average amount of printing slurry; S3. After the pretreatment slurry of the flat screen printing system is applied, the control device controls the conveying device so that the substrate to be printed advances each time by a distance equivalent to the distance X / Y of the printing plate of the flat screen printing machine, where Y is an integer greater than 1, X is a factor of Y, and X is not equal to Y; S4, the substrate to be printed will stop each time it moves forward. At this time, the flat screen printing system applies pre-treatment slurry to the substrate to be printed. The amount of pre-treatment slurry is X / Y times the average amount of printing slurry. S5. After the substrate to be printed passes through the flat screen printing system, it is driven by the conveyor device to pass through the digital printing system, and the digital printing system prints the substrate to be printed; S6. Repeat steps S3-S5 until the printing of the entire base fabric is completed.

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