Duplex printing press and dyeing method

Abstract

The present application belongs to the technical field of printing and dyeing, and particularly relates to a simple direct printing of double printing, and specifically relates to a dyeing method and a double printing machine for sequentially applying dyes and auxiliaries on the same equipment. During the printing process between the first printing roller and the second printing roller, the substrate is always wrapped on the surface of the shared compression roller, the substrate is driven to run by the two printing rollers, the path and length of the substrate between the first printing roller and the second printing roller are fixed, the first printing roller and the second printing roller share the same power device, the shared compression roller is respectively pressed on the first printing roller and the second printing roller, and the same power device is connected with the first printing roller or / and the second printing roller through a gear, or the first printing roller, the shared compression roller and the second printing roller are sequentially driven through gears, the transmission of the whole printing process is accurate, the printing is simple, and the printing is only needed to be performed once when the printing roller is installed.

Description

Technical Field

[0001] This invention belongs to the field of printing and dyeing technology, and particularly relates to a simplified direct printing method with plate matching, specifically a dyeing method and a double-plate printing machine that sequentially applies dyes and auxiliaries on the same equipment. Background Technology

[0002] In many applications, it is necessary to perform single-sided or double-sided multiple printing processes on substrates such as films, rolls of paper, and fabrics.

[0003] Meanwhile, in the traditional textile printing and dyeing process, the fabric needs to be coated with dye or various chemical working liquids, and then the fabric with dye is heated and dried, colored, and fixed. There are many traditional coating methods, such as uniform coating and heavy-duty coating. However, these methods result in a high liquid content after the fabric is coated, which can easily cause problems such as dye migration during the subsequent high-temperature drying process, affecting product quality. In addition, the energy consumption of the drying process is too high, which is not conducive to energy conservation and environmental protection.

[0004] During the dyeing process of reactive dyes, the dye will hydrolyze in the fixing alkali solution. A better solution is to apply the dye and fixing alkali in two steps to reduce hydrolysis. In the traditional continuous dyeing process, the dye is applied with alkali, dried, and then the fixing alkali is applied again, and finally dried again. This has the disadvantages of long equipment process and high energy consumption. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a dyeing method and a two-plate printing machine that sequentially apply dyes and auxiliaries on the same equipment, thereby solving the problems existing in the prior art.

[0006] One aspect of the present invention provides a dual-plate printing machine, which includes at least a frame, a dual-plate printing assembly, a common pressure roller, and a power unit. The dual-plate printing assembly includes at least a first printing device and a second printing device sequentially mounted on the frame.

[0007] The first printing apparatus includes at least a first printing roller, a first doctor blade assembly, and a first feeding assembly. The first printing roller is pressed together with the common pressure roller, and the first printing roller is cooperated with the first doctor blade assembly.

[0008] The first scraper assembly includes at least a first blade holder, a first scraper blade, and a first advance / retreat adjustment device. The first advance / retreat adjustment device is fixed on the frame and connected to the first blade holder. The first scraper blade is connected to the first blade holder, and the cutting edge of the first scraper blade is adjustablely configured to cooperate with the first printing roller. The first feeding assembly includes at least a first material trough.

[0009] The second printing apparatus includes at least a second printing roller, a second doctor blade assembly, and a second feeding assembly. The second printing roller is pressed together with the common pressure roller, and the second printing roller is cooperated with the second doctor blade assembly.

[0010] The second scraper assembly includes at least a second blade holder, a second scraper blade, and a second advance / retreat adjustment device. The second advance / retreat adjustment device is fixed on the frame and connected to the second blade holder. The second scraper blade is connected to the second blade holder, and the cutting edge of the second scraper blade is adjustablely configured to cooperate with the second printing roller. The second feeding assembly includes at least a second material trough.

[0011] The first printing roller and the second printing roller are arranged one after the other and are rotatably connected to the frame. The first printing roller and the second printing roller rotate in the same direction. The working surfaces of the first printing roller and the second printing roller are in contact with the same surface of the substrate.

[0012] The common pressure roller is positioned above or below the first printing roller and the second printing roller. The common pressure roller is rotatably connected to the frame via bearings at both ends. The common pressure roller is an elastic rubber-coated roller. The common pressure roller is disengaged from the first printing roller and the second printing roller and is synchronously driven by the power unit.

[0013] In this solution, during the printing process between the first and second printing rollers, the substrate is always covered by the surface of the shared pressure roller, and the substrate is driven by the two pressure rollers. That is to say, the path and length of the substrate between the first and second printing rollers are fixed. The first and second printing rollers share the same power unit, and the shared pressure roller presses on the first and second printing rollers respectively. Therefore, the speed of the shared pressure roller is the same, and there will be no stretching deformation as in traditional processes. Furthermore, the same power unit is connected to the first and / or second printing rollers through gears, or the first printing roller, the shared pressure roller, and the second printing roller are sequentially driven by gears. The transmission of the entire printing process is precise, and the alignment between the first and second printing rollers is simple, requiring only one alignment when installing the printing rollers. There is no need to consider alignment issues during subsequent operation.

[0014] In one preferred embodiment of the present invention, baffles are provided on the outer sides of the two shaft ends of the common pressure roller, and the shaft ends of the two common pressure rollers are respectively connected to the baffles through thrust bearings. The baffles are used to limit the axial movable stroke of the common pressure roller. A pressure device is connected to the two shaft ends of the common pressure roller, and the pressure device is used to adjust the pressure and position of the common pressure roller. The pressure device is driven by a position alignment component, which is used to adjust the angle and posture of the common pressure roller when there is uneven force between the common pressure roller and the first printing roller or the second printing roller, so that the common pressure roller runs smoothly.

[0015] In one preferred embodiment of the present invention, the common pressure roller is connected to a lifting device, the lifting device is connected to the frame, and the common pressure roller is rotatably connected to the lifting device through a bearing provided at its shaft end. The common pressure roller is disengaged from and presses against the first printing roller and the second printing roller respectively through the lifting device. The lifting device includes a sliding device and a lifting power device. The lifting power device is any one of a cylinder, a hydraulic cylinder, or a worm gear, and the sliding device is any one of a linear bearing or a slide rail.

[0016] In one preferred embodiment of the present invention, the dual-plate printing assembly is provided in two sets, each set of the dual-plate printing assembly includes its own first printing device and second printing device, the two sets of the dual-plate printing assembly are arranged one after the other, and each set of the dual-plate printing assembly is provided with a corresponding heating device on the discharge side, the substrate passes through the first set of the dual-plate printing assembly and the second set of the dual-plate printing assembly in sequence, and the dual-plate printing machine is used to continuously print and dry the same side of the substrate.

[0017] In one preferred embodiment of the present invention, the double-plate printing assembly is provided in two sets, each set including its own first printing device and second printing device. The two sets of double-plate printing assemblies are arranged sequentially according to the process flow and are mirror images of each other. The two sets of double-plate printing assemblies operate in opposite directions. Each double-plate printing assembly has a corresponding heating device in its output direction. Furthermore, the heating devices corresponding to the two sets of double-plate printing assemblies are arranged vertically and located in the same heating chamber. The substrate passes through the first set of double-plate printing assemblies and the second set of double-plate printing assemblies in sequence. The double-plate printing machine is used to print and dry the front and back sides of the substrate in sequence.

[0018] Furthermore, the first printing device of each of the two sets of dual-plate printing components applies reactive dye to the substrate, and the second printing device of each of the two sets of dual-plate printing components applies a fixing agent to the substrate. The substrate is then subjected to reactive dye application on the front side, fixing agent application, and drying, followed by reactive dye application on the back side, fixing agent application, and drying, finally resulting in a product that is dyed or printed on both sides.

[0019] This solution not only allows for single-sided or double-sided monochrome and multi-color printing on substrates, but also enables dyeing processes with low liquid content, making it widely applicable.

[0020] In one preferred embodiment of the present invention, four sets of dual-plate printing components are provided. Each of the four sets of dual-plate printing components includes its own first printing device and second printing device. The four sets of dual-plate printing components are arranged sequentially according to the process flow. The first and third sets of dual-plate printing components are mirror images of the second and fourth sets of dual-plate printing components. The first and third sets of dual-plate printing components operate in the same direction and are used to print on the front side of the substrate. The second and fourth sets of dual-plate printing components operate in the same direction but opposite to the first and third sets of dual-plate printing components and are used to print on the back side of the substrate. Each dual-plate printing component has a corresponding heating device in its output direction. The heating devices corresponding to the four sets of dual-plate printing components are arranged vertically and housed in the same heating chamber. The substrate passes sequentially through the first, second, third, and fourth sets of dual-plate printing components. The dual-plate printing machine is used to continuously print and dry the front and back sides of the substrate.

[0021] In one application scenario of this solution, the material tanks of the first and second sets of dual-plate printing components contain reactive dyes, while the material tanks of the third and fourth sets of dual-plate printing components contain fixing alkalis. The reactive dyes are applied to both sides of the fabric via the first and second sets of dual-plate printing components. After being heated and dried, the fabric enters the third and fourth sets of dual-plate printing components to apply fixing alkalis to both sides. After the fixing alkalis are applied, the fabric is heated and dried again, and the reactive dyes are then bonded to the fabric, completing the dyeing process.

[0022] In this solution, with multiple double-plate printing components set up continuously, the ingenious process setup allows the replacement of multiple traditional heating devices with a single heating device, saving equipment and a significant amount of energy.

[0023] In one preferred embodiment of the present invention, the first material trough is disposed below the first printing roller, the lower part of the first printing roller is immersed in the working fluid in the first material trough, and the first material trough is integrally disposed with the first knife holder, that is, the trough body of the first material trough is the first knife holder, the first scraper blade is connected to the end of the first knife holder, and the blade edge is configured to cooperate with the first printing roller.

[0024] The second material trough is located below the second printing roller. The lower part of the second printing roller is immersed in the working fluid in the second material trough. The second material trough is integrally formed with the second blade holder, that is, the trough body of the second material trough is the second blade holder. The second scraper blade is connected to the end of the second blade holder, and the blade edge is configured to cooperate with the second printing roller.

[0025] A first left-right swinging device is provided between the first scraper blade and the frame. One end of the first left-right swinging device is connected to the first blade holder, and the other end is connected to the frame through a connector. The first left-right swinging device drives the first scraper blade to perform left-right reciprocating motion.

[0026] A second left-right swinging device is provided between the second scraper blade and the frame. One end of the second left-right swinging device is connected to the second blade holder, and the other end is connected to the frame through a connector. The second left-right swinging device drives the second scraper blade to perform left-right reciprocating motion.

[0027] In this design, the doctor blade helps remove impurities (such as lint, yarn, etc.) carried on the surface of the corresponding gravure printing roller during its reciprocating motion.

[0028] In one preferred embodiment of the present invention, a first material trough lifting device is further provided between the first material trough and the frame. One end of the first material trough lifting device is connected to the frame, and the other end of the first material trough lifting device is connected to the first material trough. The first material trough lifting device is any one of a pneumatic device, a hydraulic device, a worm gear device, or a gear and rack device. The degree of contact between the first scraper blade and the first printing roller is adjusted by adjusting the lifting degree of the first material trough lifting device.

[0029] A first airbag device is provided between the first material trough and the first material trough lifting device. The first airbag device includes a first airbag and a support and fixing device for the first airbag. The first airbag device transmits the force of the first material trough lifting device to the first material trough, and then to the space between the first scraper blade and the first printing roller. The first airbag is one or more.

[0030] A second material trough lifting device is also provided between the second material trough and the frame. One end of the second material trough lifting device is connected to the frame, and the other end is connected to the second material trough. The second material trough lifting device can be any one of a pneumatic device, a hydraulic device, a worm gear device, or a gear and rack device. The degree of contact between the second scraper blade and the second printing roller can be adjusted by adjusting the lifting degree of the second material trough lifting device.

[0031] A second airbag device is provided between the second material trough and the second material trough lifting device. The second airbag device includes a second airbag and a second support and fixing device. The second airbag device transmits the force of the second material trough lifting device to the second material trough, and then to the space between the second scraper blade and the second printing roller. There are one or more second airbags.

[0032] In one preferred embodiment of the present invention, the first printing roller and the second printing roller are rotatably fixed on the frame in sequence, the first blade holder is disposed in front of the first printing roller, the first scraper blade is disposed inclined downward, the blade edge of the first scraper blade is disposed against the first printing roller with an adjustable gap, as the first printing roller rotates, the first scraper blade scrapes off the excess working fluid on the surface of the first printing roller, the first scraper assembly is integrally disposed with the first material trough and disposed in front of the first printing roller, the area between the first scraper assembly and the first printing roller is the first material trough area, and the working fluid is transported to the area above the first scraper blade and the first printing roller through the first pump and pipeline;

[0033] The second material trough is located below the second scraper blade and the second printing roller. The lower part of the second printing roller is immersed in the working fluid in the second material trough. The second blade holder is located in front of the second printing roller. The second scraper blade is inclined upward. The blade edge of the second scraper blade is adjusted to abut against the second printing roller. As the second printing roller rotates, the second scraper blade scrapes off the excess working fluid from the surface of the second printing roller.

[0034] The common pressure roller is disposed above the first printing roller and the second printing roller. The common pressure roller is disengaged from the first printing roller and the second printing roller and is press-rolled together. The substrate passes through the common pressure roller between the first printing roller and the second printing roller in sequence. The pressure of the common pressure roller compresses and transfers the remaining working pressure on the surface of the first printing roller and the second printing roller to the substrate.

[0035] Traditional dyeing methods mostly involve applying all the dye at once using a rolling mill (monochrome), or applying all the dye at once using gravure or rotary screen printing. This can easily lead to uneven dyeing in certain areas. In this solution, the dual-plate printing assembly of the present invention can apply the dye in a trough or multiple times. Applying the dye multiple times can cover up the unevenness caused by applying the dye in a single time.

[0036] Meanwhile, the traditional method uses a one-time application of all dye (monochrome), resulting in a high liquid load. This can easily cause migration during the subsequent deheating and drying process, leading to color variations on the fabric and affecting product quality. In this solution, the dye is applied in small amounts multiple times through two or more sets of dual-plate printing components. The liquid load during each drying process is very low, so migration is less likely to occur during each drying process. This effectively reduces quality abnormalities caused by dye migration and can also cover up quality problems such as irregular patterns caused by the mesh texture on the printing roller surface.

[0037] Furthermore, the two consecutive dye applications and subsequent drying are carried out simultaneously, which reduces the number of working steps compared to traditional gravure or rotary screen printing. This not only reduces the deformation of the fabric caused by repeated stretching during operation, but also saves energy and costs.

[0038] In one preferred embodiment of the present invention, both the first printing roller and the second printing roller are gravure printing rollers, the second doctor blade assembly is a second pressure roller assembly, the second pressure roller assembly includes a second pressure roller and a pressure regulating device, the pressure regulating device is a second material trough advance / retreat regulating device, the surface of the second pressure roller is covered with an elastic material, the outer circumference of the second pressure roller is the cutting edge of the second doctor blade, the second pressure roller is adjustablely positioned against the front of the second printing roller, the second material trough is formed above the second pressure roller and the second printing roller, as the second printing roller rotates, the second pressure roller squeezes out excess working fluid from the surface of the second printing roller, leaving only the working fluid in the recessed part of the surface of the gravure printing roller; the common pressure roller is disengaged and presses against the side above the second printing roller, the substrate passes between the common pressure roller and the second printing roller, the common pressure roller presses and transfers the remaining working fluid on the surface of the second printing roller to the surface of the substrate.

[0039] In one preferred embodiment of the present invention, a dyeing method is also provided, which can be used in any of the above-described double-plate printing presses, the dyeing method comprising:

[0040] Step A: The substrate is printed with dye or fixing agent on the front side at the first printing device of the above-mentioned double-plate printing machine;

[0041] Step B: Without drying, the fixing agent or dye is printed on the front side at the second printing unit of the same double-plate printing press.

[0042] Step C: Dry the substrate treated in steps A and B;

[0043] Step D: Collect the dried substrate as the finished product. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art 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 the structures shown in these drawings without creative effort.

[0045] Figure 1 A schematic diagram illustrating the structure of a single-sided double-plate gravure printing machine according to one embodiment of the present invention;

[0046] Figure 2 A schematic diagram illustrating a single-sided double-plate gravure printing structure according to another embodiment of the present invention;

[0047] Figure 3 This is a schematic diagram of a common pressure roller structure according to one embodiment of the present invention;

[0048] Figure 4 A schematic diagram showing the structure of a shared pressure roller and a position alignment component according to another embodiment of the present invention;

[0049] Figure 5 A schematic diagram illustrating the front-to-back arrangement of two sets of double-plate gravure printing components connected in one embodiment of the present invention;

[0050] Figure 6 A schematic diagram illustrating the front-to-back mirror arrangement of two sets of double-plate gravure printing components according to one embodiment of the present invention;

[0051] Figure 7 This is a schematic diagram illustrating the structure of four sets of double-plate gravure printing components arranged in a mirror image configuration according to one embodiment of the present invention. Detailed Implementation

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0053] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0054] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0055] Please refer to Figures 1-2 One embodiment of the present invention provides a dual-plate printing machine, which includes at least a frame 100, a dual-plate printing assembly, a common pressure roller 300 and a power unit 400. The dual-plate printing assembly includes at least a first printing device 210 and a second printing device 220 sequentially mounted on the frame 100.

[0056] The first printing apparatus 210 includes at least a first printing roller 211, a first doctor blade assembly, and a first feeding assembly. The first printing roller 211 is pressed together with the common pressure roller 300, and the first printing roller 211 is cooperated with the first doctor blade assembly.

[0057] The first scraper assembly includes at least a first blade holder, a first scraper blade 2122, and a first advance / retreat adjustment device 2323. The first advance / retreat adjustment device 2323 is fixed on the frame 100 and is connected to the first blade holder. The first scraper blade 2122 is connected to the first blade holder, and the cutting edge of the first scraper blade 2122 is adjustablely configured to cooperate with the first printing roller 211. The first feeding assembly includes at least a first material trough 213.

[0058] The second printing apparatus 220 includes at least a second printing roller 221, a second doctor blade assembly, and a second feeding assembly. The second printing roller 221 is pressed and disposed with the common pressure roller 300, and the second printing roller 221 is configured to cooperate with the second doctor blade assembly.

[0059] The second scraper assembly includes at least a second blade holder, a second scraper blade 2222, and a second advance / retreat adjustment device 2223. The second advance / retreat adjustment device 2223 is fixed on the frame 100 and connected to the second blade holder. The second scraper blade 2222 is connected to the second blade holder, and the cutting edge of the second scraper blade 2222 is adjustablely configured to cooperate with the second printing roller 221. The second feeding assembly includes at least a second material trough 223.

[0060] The first printing roller 211 and the second printing roller 221 are arranged one after the other and are rotatably connected to the frame 100. The first printing roller 211 and the second printing roller 221 rotate in the same direction. The working surface of the first printing roller 211 and the working surface of the second printing roller 221 are in contact with the same surface of the substrate.

[0061] The common pressure roller 300 is disposed above or below the first printing roller 211 and the second printing roller 221. The common pressure roller 300 is rotatably connected to the frame 100 through bearings disposed at both ends. The common pressure roller 300 is an elastic rubber-coated roller. The common pressure roller 300 is disengaged from the first printing roller 211 and the second printing roller 221 and is respectively configured to press and roll. The power unit 400 is synchronously connected to the first printing roller 211 and the second printing roller 221.

[0062] In this embodiment, during the printing process between the first printing roller 211 and the second printing roller 221, the substrate is always covered by the surface of the common pressure roller 300. The substrate is driven by the two pressure rollers, meaning that the path and length of the substrate between the first printing roller 211 and the second printing roller 221 are fixed. The first printing roller 211 and the second printing roller 221 share the same power unit 400. The common pressure roller 300 presses on the first printing roller 211 and the second printing roller 221 respectively. Therefore, the speed of the common pressure roller 300 is the same, and there will be no stretching deformation as in traditional processes. Furthermore, the same power unit 400 is connected to the first printing roller 211 and / or the second printing roller 221 through gears, or the first printing roller 211, the common pressure roller 300, and the second printing roller 221 are sequentially driven by gears. The transmission of the entire printing process is precise, and the alignment between the first printing roller 211 and the second printing roller 221 is simple, requiring only one alignment during roller installation. There is no need to consider alignment issues during subsequent operation.

[0063] Because the manufacturing of printing rollers inevitably results in conditions such as taper (different diameters at both ends), and the positions of the two printing rollers will inevitably be inconsistent during installation, it is difficult to ensure uniform pressing with the two printing rollers after the shared pressure roller is installed. This causes uneven force on the left, center and right sides of the substrate, ultimately leading to color differences between the left, center and right sides.

[0064] Please refer to Figure 3 , Figure 4 In one preferred embodiment of the present invention, baffles 320 are provided on the outer sides of the two shaft ends 310 of the common pressure roller 300. The shaft ends 310 of the two common pressure rollers are respectively connected to the baffles 320 through thrust bearings 330. The baffles 320 are used to limit the axial movable stroke of the common pressure roller 300. The two shaft ends 310 of the common pressure roller 300 are respectively connected to pressure devices 340. The pressure devices 340 are used to adjust the height position of the common pressure roller 300. The pressure devices 340 and the shaft ends 310 of the common pressure roller 300 are connected by a position alignment component. When the common pressure roller 300 is subjected to uneven force with the first printing roller 211 or the second printing roller 221, the position alignment component adjusts the angle and posture of the common pressure roller 300 so that the common pressure roller 300 runs smoothly.

[0065] In one application scenario of this embodiment, the two end shafts of the pressure device 340 and the common pressure roller 300 are connected by bearings 350. The connecting piece between the bearing seat 351 and the pressure device 340 is provided with a groove 360 ​​perpendicular to the pressure direction of the pressure device 340. The bearing seat 351 can slide back and forth along the groove 360.

[0066] Alternatively, in another application scenario of this embodiment, the two end shafts of the pressure device 340 and the common pressure roller 300 are connected by bearings 350. The connecting piece between the pressure device 340 and the frame is provided with a groove 360 ​​perpendicular to the pressure direction of the pressure device 340. The pressure device 340 can slide back and forth along the groove 360, thereby driving the bearing seat 351 and the common pressure roller 300 to move left and right.

[0067] In the two application scenarios described above in this embodiment, the pressure device 340 can be selected as any one of a pneumatic push rod, an electric push rod, or a servo motor; and the sliding stroke of the pressure device 340 along the slide groove 360 ​​is within 5 mm, and the slide groove 360 ​​can also be replaced by a circular hole with a larger diameter.

[0068] In one preferred embodiment of the present invention, the common pressure roller 300 is connected to a lifting device, the lifting device is connected to the frame 100, the common pressure roller 300 is rotatably connected to the lifting device through a bearing provided at its shaft end, and the common pressure roller 300 is disengaged and press-rolled with the first printing roller 211 and the second printing roller 221 respectively through the lifting device; the lifting device includes a sliding device and a lifting power device 400, the lifting power device 400 is any one of a cylinder, a hydraulic cylinder or a worm gear, and the sliding device is any one of a linear bearing or a slide rail.

[0069] Please refer to Figure 5 In one preferred embodiment of the present invention, the dual-plate printing assembly is provided in two sets, each set including its own first printing device 210 and second printing device 220. The two sets of dual-plate printing assemblies are arranged one after the other, and each set of dual-plate printing assemblies is provided with a corresponding heating device 500 on the discharge side. The substrate passes sequentially through the first printing device 210, the second printing device 220, and the heating device 500 of the first set of dual-plate printing assemblies, and the first printing device 210, the second printing device 220, and the heating device 500 of the second set of dual-plate printing assemblies. The dual-plate printing machine is used to continuously print and dry the same side of the substrate.

[0070] In one application scenario of this embodiment, the dual-plate printing assembly is arranged in two sets according to the process flow. A heating device 500 is provided at the rear of each set of dual-plate printing assemblies. The heating device 500 is a tenter frame. The tenter frame heats, dries, stretches, and sets the corresponding output substrate. The temperature of each set of tenter frames is gradually increased from front to back.

[0071] In another application scenario of this embodiment, the dual-plate printing assembly is arranged in two sets according to the process flow. Each set of dual-plate printing assemblies is equipped with a heating wheel set at the rear. The heating wheel sets heat and dry the corresponding output substrate. The temperature of each set of heating wheel sets is gradually increased from front to back.

[0072] Please refer to Figure 6In one preferred embodiment of the present invention, two sets of dual-plate printing components are provided. Each set of dual-plate printing components includes its own first printing device 210 and second printing device 220. The two sets of dual-plate printing components are arranged sequentially according to the process flow and are mirror images of each other. The two sets of dual-plate printing components operate in opposite directions. Each set of dual-plate printing components has a corresponding heating device 500 in its output direction. The heating devices 500 of the two sets of dual-plate printing components are arranged vertically and are housed in the same heating chamber. The substrate passes sequentially through the first printing device 210, the second printing device 220, and the heating device 500 of the first set of dual-plate printing components, and the first printing device 210, the second printing device 220, and the heating device 500 of the second set of dual-plate printing components. The dual-plate printing machine is used to sequentially print and dry the front and back sides of the substrate.

[0073] Furthermore, the first printing device of each of the two sets of dual-plate printing components applies reactive dye to the substrate, and the second printing device of each of the two sets of dual-plate printing components applies a fixing agent to the substrate. The substrate is then subjected to reactive dye application on the front side, fixing agent application, and drying, followed by reactive dye application on the back side, fixing agent application, and drying, finally resulting in a product that is dyed or printed on both sides.

[0074] In this embodiment, not only can single-sided or double-sided monochrome and multi-color printing be performed on the substrate, but also low-liquid-volume dyeing processing can be achieved, making it applicable to a wide range of applications.

[0075] Please refer to Figure 7In one preferred embodiment of the present invention, four sets of dual-plate printing components are provided. Each of the four sets of dual-plate printing components includes its own first printing device 210 and second printing device 220. The four sets of dual-plate printing components are arranged sequentially according to the process flow. The first and third sets of dual-plate printing components are mirror images of the second and fourth sets of dual-plate printing components. The first and third sets of dual-plate printing components operate in the same direction and are used to print on the front side of the substrate. The second and fourth sets of dual-plate printing components operate in the same direction but opposite to the first and third sets of dual-plate printing components and are used to print on the back side of the substrate. Each dual-plate printing component has a corresponding heating device 500 in its output direction. The heating devices 500 corresponding to the four sets of dual-plate printing components are arranged vertically and housed in the same heating chamber. The substrate passes sequentially through the first printing device 210, the second printing device 220, and the heating device 500 of the first set of dual-plate printing components; the first printing device 210, the second printing device 220, and the heating device 500 of the second set of dual-plate printing components; the first printing device 210, the second printing device 220, and the heating device 500 of the third set of dual-plate printing components; and the first printing device 210, the second printing device 220, and the heating device 500 of the fourth set of dual-plate printing components. The dual-plate printing machine is used to continuously print and dry the front and back sides of the substrate.

[0076] In one application scenario of this embodiment, the material tanks of the first and second sets of dual-plate printing components contain reactive dyes, while the material tanks of the third and fourth sets of dual-plate printing components contain fixing alkalis. The reactive dyes are applied to both sides of the fabric via the first and second sets of dual-plate printing components. After being heated and dried, the fabric enters the third and fourth sets of dual-plate printing components to apply fixing alkalis to both sides. After the fixing alkalis are applied, the fabric is heated and dried again, and the reactive dyes are bonded to the fabric, completing the dyeing process.

[0077] In this embodiment, with multiple dual-plate printing components set up consecutively, due to the ingenious process setup, the traditional multiple heating devices 500 can be replaced by a single heating device 500, saving equipment and a significant amount of energy.

[0078] In one embodiment of the present invention, the first printing device 210 and the second printing device 220 of the same set of dual-plate printing components share the same power unit 400, which is connected to the first plate roller 211 and the second plate roller 221 via gears; or, the first plate roller 211, the shared pressure roller 300, and the second plate roller 221 are sequentially driven by gears. With this arrangement, during the operation of the substrate from each of the first printing devices 210 to the second printing devices 220, it is covered by the surfaces of the first plate roller 211, the shared pressure roller 300, and the second plate roller 221, so that the substrate is not stretched, ensuring the accuracy of the transmission and facilitating plate registration.

[0079] In one preferred application scenario of this embodiment, the first printing roller 211, the common pressure roller 300, and the second printing roller 221 of the same set of dual-plate printing components have the same diameter to ensure that the linear speed of each roller is the same.

[0080] In one embodiment of the present invention, the first printing roller 211 and the second printing roller 221 are both gravure printing rollers, and their outer surfaces are provided with recessed patterns.

[0081] The first scraper assembly includes at least a first blade holder, a first scraper blade 2122, and a first advance / retreat adjustment device 2323. The first advance / retreat adjustment device 2323 is fixed on the frame 100 and connected to the first blade holder. The first scraper blade 2122 is fixed on the first blade holder. The cutting edge of the first scraper blade 2122 is adjustablely pressed against the outer circumferential surface of the first gravure printing roller. The first material groove 213 is located below or around the first gravure printing roller. Part of the first gravure printing roller is immersed in the working fluid in the first material groove 213.

[0082] The second scraper assembly includes at least a second blade holder, a second scraper blade 2222, and a second advance / retreat adjustment device 2223. The second advance / retreat adjustment device 2223 is fixed on the frame 100 and connected to the second blade holder. The second scraper blade 2222 is fixed on the second blade holder, and the cutting edge of the second scraper blade 2222 is adjustablely pressed against the outer circumferential surface of the second gravure printing roller. The second material trough 223 is located below or around the second gravure printing roller, and part of the roller body of the second gravure printing roller is immersed in the working fluid in the second material trough 223.

[0083] In one preferred embodiment of the present invention, the first material trough 213 is disposed below the first printing roller 211, the lower part of the first printing roller 211 is immersed in the working fluid in the first material trough 213, and the first material trough 213 is integrally disposed with the first knife holder, that is, the trough body of the first material trough 213 is the first knife holder, and the first scraper blade 2122 is connected to the end of the first knife holder, and the blade edge is configured to cooperate with the first printing roller 211.

[0084] The second material trough 223 is disposed below the second printing roller 221. The lower part of the second printing roller 221 is immersed in the working fluid in the second material trough 223. The second material trough 223 is integrally disposed with the second blade holder, that is, the trough body of the second material trough 223 is the second blade holder. The second scraper blade 2222 is connected to the end of the second blade holder, and the blade edge is configured to cooperate with the second printing roller 221.

[0085] A first left-right swinging device 230 is provided between the first scraper blade 2122 and the frame 100. One end of the first left-right swinging device 230 is connected to the first blade holder, and the other end is connected to the frame 100 through a connector. The first left-right swinging device 230 drives the first scraper blade 2122 to perform left-right reciprocating motion.

[0086] A second left-right swinging device 240 is provided between the second scraper blade 2222 and the frame 100. One end of the second left-right swinging device 240 is connected to the second blade holder, and the other end is connected to the frame 100 through a connector. The second left-right swinging device 240 drives the second scraper blade 2222 to perform left-right reciprocating motion.

[0087] In this embodiment, the doctor blade helps to remove impurities (such as lint, yarn, etc.) carried on the surface of the corresponding gravure printing roller during its reciprocating motion.

[0088] In one preferred embodiment of the present invention, a first material trough lifting device is further provided between the first material trough 213 and the frame 100. One end of the first material trough lifting device is connected to the frame 100, and the other end of the first material trough lifting device is connected to the first material trough 213. The first material trough lifting device is any one of a pneumatic device, a hydraulic device, a worm gear device, or a gear and rack device. The degree of contact between the first scraper blade 2122 and the first printing roller 211 is adjusted by adjusting the lifting degree of the first material trough lifting device.

[0089] A first airbag device is provided between the first material trough 213 and the first material trough lifting device. The first airbag device includes a first airbag 260 and a support and fixing device for the first airbag 260. The first airbag device transmits the force of the first material trough lifting device to the first material trough 213, and then to the space between the first scraper blade 2122 and the first printing roller 211. The first airbag 260 can be one or more.

[0090] A second material trough lifting device is also provided between the second material trough 223 and the frame 100. One end of the second material trough lifting device is connected to the frame 100, and the other end is connected to the second material trough 223. The second material trough lifting device can be any one of a pneumatic device, a hydraulic device, a worm gear device, or a gear and rack device. The degree of contact between the second scraper blade 2222 and the second printing roller 221 can be adjusted by adjusting the lifting degree of the second material trough lifting device.

[0091] A second airbag device is provided between the second material trough 223 and the second material trough lifting device. The second airbag device includes a second airbag 270 and a second support and fixing device 271. The second airbag device transmits the force of the second material trough lifting device to the second material trough 223, and then to the space between the second scraper blade 2222 and the second printing roller 221. There are one or more second airbags 270.

[0092] In one embodiment, the first swing device includes a swing power device 400 and a swing sliding device. The swing sliding device includes a slide rail (or slide rod) and a slider (or linear bearing). The slide rail is connected to the first lifting device, and the slider is connected to the first supporting and fixing device 261. One end of the swing power device 400 is connected to the first lifting device or the slide rail, and the other end is connected to the first supporting and fixing device 261, driving the first supporting and fixing device 261, the first material trough 213, and the first scraper blade 2122 to slide left and right.

[0093] The second swing device also includes a corresponding swing power device 400 and a sliding device. The sliding device includes a slide rail (or slide rod) and a slider (or linear bearing). The slide rail is connected to the second lifting device, and the slider is connected to the second support fixing device 271. One end of the swing power device 400 is connected to the second lifting device or the slide rail, and the other end is connected to the second support fixing device 271, driving the second support fixing device 271, the second material trough 223, and the second scraper blade 2222 to slide left and right.

[0094] In one embodiment, the swing power device 400 is a cylinder, a hydraulic cylinder, or a reduction motor. The output end of the reduction motor is connected to an eccentric wheel, and the rotation of the eccentric wheel drives the first scraper blade 2122 to slide left and right.

[0095] In one embodiment, there are two first scraper blades 2122, namely a first shovel blade 2123 and a first scraper blade 2122. The two blades are respectively disposed at the front end and the rear end of the first blade holder. The first shovel blade 2123 is used to remove excess working fluid from the surface of the first printing roller 211 to obtain a uniform working fluid. The scraper blade is used to scrape off impurities from the surface of the first printing roller 211. At the same time, the arrangement of the two blades also effectively seals the material trough, making it difficult for the working fluid to evaporate.

[0096] During operation, if the blade is damaged, it needs to be replaced as soon as possible. Ideally, both blades should be designed for quick replacement.

[0097] In one embodiment, there are two first airbags 260, which are respectively disposed at the front and rear of the first material trough 213 support device, and the length direction of the two airbags is parallel to the width direction of the first gravure printing roller.

[0098] In one embodiment, there are three first airbags 260. The three airbags are respectively positioned at the left, center, and right positions of the first support and fixing device 261. The air pressure of the three airbags can be adjusted independently. The left, center, and right pressure between the first scraper blade 2122 and the first printing roller 211 can be adjusted by adjusting the air pressure of the three airbags.

[0099] Furthermore, the airbag consists of two sets of airbags, each set having three airbags. The two sets of airbags are positioned at the front and rear of the first support and fixing device 261, with the three airbags of each set positioned at the left, center, and right positions of the first support and fixing device 261, respectively. The pressure of each airbag is adjustable. This arrangement allows for a more balanced pressure between the first scraper blade 2122 and the first printing roller 211 on the left, center, and right.

[0100] In one embodiment, the first material trough 213 and the first support and fixing device 261 are slidably connected up and down by an up-and-down sliding device 270. The up-and-down sliding device 270 is preferably a sliding rail and a slider that are matched together. The sliding rail is connected to the first support and fixing device 261, and the slider is connected to the first material trough 213. The first material trough 213 slides up and down with the first support and fixing device 261 as the compression degree of the first airbag 260 changes.

[0101] In one embodiment, the sliding gap between the first material trough 213 and the first support fixing device 261 is adjustable, preferably with a gap adjustment block provided at the sliding gap between the first material trough 213 and the first support fixing device 261.

[0102] In one embodiment, a first and a second material trough lifting device are respectively provided below the first and second material troughs 223. The first and second material trough lifting devices are gear / rack type lifting devices or worm gear type lifting devices, or hydraulic or pneumatic lifting devices. The lifting action of the lifting devices causes the corresponding material troughs to move up and down, which is conducive to cleaning and material replacement.

[0103] In one preferred embodiment of the present invention, the first printing roller 211 and the second printing roller 221 are rotatably fixed on the frame 100 in sequence. The first blade holder is disposed in front of the first printing roller 211, and the first scraper blade 2122 is disposed inclined downward. The blade edge of the first scraper blade 2122 is disposed against the first printing roller 211 with an adjustable gap. As the first printing roller 211 rotates, the first scraper blade 2122 scrapes off the excess working fluid from the surface of the first printing roller 211. The first scraper assembly is integrally disposed with the first material trough 213 and disposed in front of the first printing roller 211. The area between the first scraper assembly and the first printing roller 211 is the area of ​​the first material trough 213. The working fluid is transported to the area above the first scraper blade 2122 and the first printing roller 211 through the first pump and pipeline.

[0104] The second material trough 223 is located below the second scraper blade 2222 and the second printing roller 221. The lower part of the second printing roller 221 is immersed in the working fluid in the second material trough 223. The second blade holder is located in front of the second printing roller 221. The second scraper blade 2222 is inclined upward. The blade edge of the second scraper blade 2222 is adjusted to abut against the second printing roller 221. As the second printing roller 221 rotates, the second scraper blade 2222 scrapes off the excess working fluid from the surface of the second printing roller 221.

[0105] The common pressure roller 300 is disposed above the first printing roller 211 and the second printing roller 221. The common pressure roller 300 is disengaged from the first printing roller 211 and the second printing roller 221 and is press-rolled together. The substrate passes through the common pressure roller 300 between the first printing roller 211 and the second printing roller 221 in sequence. The pressure of the common pressure roller 300 compresses and transfers the remaining working pressure on the surface of the first printing roller 211 and the second printing roller 221 onto the substrate.

[0106] Traditional dyeing methods mostly involve applying all the dye at once using a rolling mill (monochrome), or applying all the dye at once using gravure or rotary screen printing. This can easily lead to uneven dyeing in certain areas. In this embodiment, the dual-plate printing assembly of the present invention can apply the dye in a trough or multiple times. Applying the dye multiple times can cover up the unevenness caused by applying the dye in a single time.

[0107] Meanwhile, the traditional method uses a one-time application of all dye (monochrome), resulting in a high liquid content. This can easily cause migration during the subsequent deheating and drying process, leading to color variations on the fabric and affecting product quality. In this embodiment, the dye is applied in small amounts multiple times using two or more sets of the dual-plate printing components. The liquid content is very low during each drying process, so migration is less likely to occur during each drying process. This can effectively reduce quality abnormalities caused by dye migration and can also cover up quality problems such as irregular patterns caused by the mesh texture on the printing roller surface.

[0108] Furthermore, the two consecutive dye applications and subsequent drying are carried out simultaneously, which reduces the number of working steps compared to traditional gravure or rotary screen printing. This not only reduces the deformation of the fabric caused by repeated stretching during operation, but also saves energy and costs.

[0109] One embodiment, ( Figure 1 The first and second blade holders are rotatably connected to the frame 100 via a rotating device 250. The rotating device 250 includes a worm gear and a worm shaft that are fitted together. The worm shaft is connected to the frame 100, and the worm gear is connected to the blade holder's connecting piece (rotating shaft). The rotation of the worm gear drives the blade holder and the doctor blade to rotate, adjusting the gap and pressure between the doctor blade and the corresponding gravure printing roller.

[0110] Furthermore, the position of the connecting part (rotating shaft) between the blade holder and the corresponding blade holder is adjustable. By adjusting the position of the connecting part (rotating shaft) between the blade holder and the corresponding blade holder, the angle and distance between the corresponding scraper blade and the corresponding gravure roller can be adjusted to meet the requirements of gravure rollers of different diameters.

[0111] Furthermore, a left-right swinging device is provided between the first and second blade holders and the frame 100. One end of the left-right swinging device is connected to the blade holder or blade holder connector (rotating shaft), and the other end is connected to the frame 100. The left-right swinging device drives the corresponding blade holder and scraper blade to reciprocate left and right. During the reciprocating motion, the scraper blade can remove impurities carried on the surface of the corresponding gravure printing roller.

[0112] In one embodiment, the left and right swinging device includes a swinging power device 400 and a sliding device. The sliding device includes a slide rail (or slide rod) and a slider (or linear bearing or slide sleeve). The slide rail (or slide rod) is connected to the corresponding tool holder, and the slider (or slide sleeve or linear bearing) is connected to the frame 100. One end of the swinging power device 400 is connected to the frame 100, and the other end is connected to the corresponding slide rail (or slide rod), driving the corresponding tool holder and scraper blade to slide left and right.

[0113] In one embodiment, the side wall of the frame 100 is provided with an eccentric wheel or a cam, the connecting member of the tool holder is a rotating shaft, which is also the slide rod, the side wall of the frame 100 is provided with a sliding sleeve, the rotating shaft passes through the sliding sleeve and is connected to the corresponding eccentric wheel or cam, the eccentric wheel or cam drives the rotating shaft to swing left and right, thereby driving the corresponding scraper blade to swing left and right.

[0114] The swing power device 400 is a cylinder, hydraulic cylinder, reducer, etc., preferably a reducer. The input shaft of the reducer is connected to the power device 400 for transmission. The output end of the reducer is connected to an eccentric wheel or cam. The corresponding tool holder connecting part (rotating shaft) is connected to a stop block that cooperates with the eccentric wheel. The rotation of the eccentric wheel drives the corresponding stop block to swing left and right, thereby driving the corresponding tool holder and scraper blade to swing left and right.

[0115] In one embodiment, the angle (acute angle) between the tangent of the first printing roller 211 at the cutting edge of the first doctor blade 2122 and the first doctor blade 2122 is between 10° and 60°, preferably 20° and 30°, and the angle (acute angle) between the tangent of the second printing roller 221 at the cutting edge of the second doctor blade 2222 and the second doctor blade 2222 is between 10° and 60°, preferably 20° and 30°.

[0116] In one preferred embodiment of the present invention, the first printing roller 211 and the second printing roller 221 are both gravure printing rollers, the second doctor blade assembly is a second pressure roller assembly, the second pressure roller assembly includes a second pressure roller and a pressure regulating device, the pressure regulating device is a second material groove 223 advance / retreat regulating device, the surface of the second pressure roller is covered with an elastic material, the outer circular surface of the second pressure roller is the cutting edge of the second doctor blade 2222, the second pressure roller is adjustablely positioned against the front of the second printing roller 221, the second material groove 223 is formed above the second pressure roller and the second printing roller 221, as the second printing roller 221 rotates, the second pressure roller squeezes out the excess working fluid on the surface of the second printing roller 221, leaving only the working fluid in the concave part of the surface of the gravure printing roller; the common pressure roller 300 is disengaged and presses against the side above the second printing roller 221, the substrate passes between the common pressure roller 300 and the second printing roller 221, the common pressure roller 300 presses and transfers the remaining working fluid on the surface of the second printing roller 221 to the surface of the substrate.

[0117] In one application scenario of this embodiment, the second scraper assembly includes a second left baffle and a second right baffle. The second left baffle and the second right baffle are respectively disposed at both ends of the second printing roller 221 and the second scraper blade 2222. The second left baffle and the second right baffle, together with the second printing roller 221 and the second scraper blade 2222, form the second liquid storage area of ​​the second material trough 223.

[0118] In another application scenario of this embodiment, the first printing roller 211 and / or the second printing roller 221 are both double-layer gravure printing rollers. The double-layer gravure printing roller includes an outer layer, an inner layer, and a shaft core. The outer layer is a thick-walled steel pipe, and the inner layer is a thick-walled steel pipe. The diameter of the cross-section of the middle part of the inner layer is larger than the diameter of the cross-section of the two ends. The outer wall of the middle part of the inner layer is connected to the inner wall of the middle part of the outer layer. The two ends of the outer layer and the two ends of the inner layer are connected by a retaining ring or sealing ring provided at the end of the outer layer. The inner layer is connected to the shaft core. The surface of the outer layer is stainless steel, electroplated hard chrome, ceramic, or coated with rubber. Its working area is provided with concave or convex parts. The concave or convex parts form a pre-designed pattern on the surface of the outer layer.

[0119] In one embodiment, the outer circle or end face of the first printing roller 211 and the second printing roller 221 are provided with a crosshair for plate alignment. A torque limiter is provided between the gear at the shaft end of the first printing roller 211 or / and the second printing roller 221 and the end shaft. The maximum torque of the torque limiter must be sufficient to ensure that the gear does not slip. When online plate alignment is required, the torque of the torque limiter is reduced, and the corresponding gravure printing roller and the gear achieve plate alignment by slipping. After plate alignment is completed, the torque of the torque limiter is increased, and the gravure printing roller rotates with the gear.

[0120] Furthermore, to achieve online automatic plate matching, a crosshair capture device can be set up to capture the crosshair using imaging technology. The position signal of the crosshair is used to automatically control the output torque of the torque limiter. The torque limiter is preferably a magnetic powder clutch or an electromagnetic clutch.

[0121] In one embodiment, the first printing roller 211 and the second printing roller 221 are disposed on the same horizontal plane, and the common pressure roller 300 is disposed above the first printing roller 211 and the second printing roller 221. The axes of the common pressure roller 300, the first printing roller 211, and the second printing roller 221 are arranged parallel to each other. The first printing roller 211 and the second printing roller 221 are mirror images of the axis of the common pressure roller 300. The first printing roller 211, the common pressure roller 300, and the second printing roller 221 have the same diameter. The outer circle or end face of the first printing roller 211 and the second printing roller 221 are provided with a crosshair for plate alignment. When installing the printing rollers, the two crosshairs are aligned with the preset position to achieve accurate plate alignment of the front and back sides. Therefore, the plate alignment operation is very simple.

[0122] Furthermore, the operation of two printing rollers can be controlled by two servo motors, and with the addition of imaging technology, real-time plate matching can be achieved, although the equipment cost is relatively high.

[0123] The heating device 500 is one or more of a heating wheel assembly, an oven, a steaming machine, a tenter frame, etc. The heating device 500 heats, dries, and shapes the corresponding output substrate. The temperature of each heating device 500 is set to gradually increase from front to back.

[0124] In one embodiment, the heating device 500 is a heating wheel assembly, each of which includes multiple heating wheels. The central shaft of each heating wheel is provided with a through hole, through which steam or heat transfer oil is introduced into the heating wheel. Furthermore, the heating wheel assembly is provided with an insulation box and an exhaust gas collection device, which saves energy and facilitates the recovery and treatment of waste gas.

[0125] Furthermore, one or more of the following are provided in front of the double-plate printing machine: a substrate feeding device, an online pre-treatment device (degreasing and desizing device), a plasma treatment device, and a corona treatment device. Behind the last set of heating devices 500, there are post-treatment devices and finished product collection devices, such as functional treatment devices for water washing, hand feel treatment, and mildew prevention treatment. Between each device, there are also auxiliary devices such as tension detection and control devices, unfolding devices, and edge / centering devices.

[0126] In one embodiment, one or more ironing rollers are provided in front of the first printing roller 211. The one or more ironing rollers are arranged in sequence to perform ironing and shaping operations on the fabric before it enters the pressing device.

[0127] In one embodiment of the present invention, the first printing device 210 and the second printing device 220 further include a batching and feeding system. The batching and feeding system can be configured separately or shared. The feeding system includes at least one raw material barrel, a pipe and pump connecting the raw material barrel and the material tank and / or the material barrel, a pipe and pump connecting the material barrel and the printing device, and a pipe and pump connecting the material tank and the material barrel.

[0128] Furthermore, the feeding system includes at least four raw material barrels, and at least four pipes and pumps connecting the raw material barrels and the feed barrels;

[0129] The material barrel and / or material tank are also equipped with a dye liquor stirring device, which is connected to a driving device, which is a pneumatic motor, a hydraulic motor, or an electric motor.

[0130] In one embodiment, the first blade holder has a through hole along its axial direction, and the first blade holder and the second blade holder both have a plurality of discharge holes along their radial directions. One end of each discharge hole is connected to the through hole, and the other end faces the space between the corresponding scraper blade and the printing roller. The through hole is connected to the feeding system.

[0131] A color detection and control system is also installed behind the double-plate printing press or behind the heating device 500 located behind the double-plate printing press. The color detection and control system includes a spectrophotometer, a data processor and a data storage device, and a material dispensing control system. The spectrophotometer, the data storage device, and the material dispensing control system are all electrically connected to the data processor. The color detection and control system transmits the detected color signals to the material dispensing and feeding system, thereby realizing automatic color adjustment control.

[0132] In one embodiment, the double-plate printing press further includes an ultrasonic oscillation device, which includes an ultrasonic generator, an amplitude transformer, a transducer, and a vibrator.

[0133] The vibrator is installed on the side wall of the trough or bucket; the amplitude transformer is connected to the ultrasonic generator; the amplitude transformer is connected to the transducer; and the transducer is connected to the vibrator. The ultrasonic frequency of the ultrasonic oscillation device is between 20-80KHz, and the input power of the ultrasonic oscillation device is between 0 and 5kW.

[0134] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

[0135] In one embodiment of the present invention, the dual-plate printing press can also be used to implement a dyeing method 1 in which dyes and auxiliaries are applied sequentially on the same machine. The specific method 1 includes the following steps:

[0136] Step A: The substrate is printed with dye or fixing agent on the front side at the first printing device of the above-mentioned double-plate printing machine;

[0137] Step B: Without drying, the fixing agent or dye is printed on the front side at the second printing unit of the same double-plate printing press.

[0138] Step C: Dry the substrate treated in steps A and B;

[0139] Step D: Collect the dried substrate as the finished product.

[0140] In different application scenarios of this embodiment, the following application methods can also be extended:

[0141] Method 2 involves repeating steps A, B, and C after step C in Method 1.

[0142] Method 3: Repeat steps A and B of Method 1 between steps B and C to print dye and fixing agent on the reverse side of the fabric.

[0143] Method 4: Repeat steps A, B, and C of Method 1 between steps C and D to print dye and fixing agent on the reverse side of the fabric.

[0144] Method 5: After step D in Method 1, repeat steps A, B, C, and D above to print dye and fixing agent on the reverse side of the fabric.

Claims

1. A double-sided printing machine, characterized in that, At least comprising a frame, a double printing assembly, a common pressure roller and a power device, the double printing assembly at least comprising a first printing device and a second printing device installed on the frame in sequence; The first printing device at least comprises a first plate roller, a first doctor blade assembly and a first feeding assembly, the first plate roller is arranged in pressure with the common pressure roller, and the first plate roller is arranged in cooperation with the first doctor blade assembly; The first doctor blade assembly at least comprises a first doctor blade holder, a first doctor blade and a first advance and retreat adjusting device, the first advance and retreat adjusting device is fixed on the frame, the first advance and retreat adjusting device is connected with the first doctor blade holder, the first doctor blade is connected with the first doctor blade holder, and the cutting edge of the first doctor blade is adjustably arranged in cooperation with the first plate roller; the first feeding assembly at least comprises a first trough; The second printing device at least comprises a second plate roller, a second doctor blade assembly and a second feeding assembly, the second plate roller is arranged in pressure with the common pressure roller, and the second plate roller is arranged in cooperation with the second doctor blade assembly; The second doctor blade assembly at least comprises a second doctor blade holder, a second doctor blade and a second advance and retreat adjusting device, the second advance and retreat adjusting device is fixed on the frame, the second advance and retreat adjusting device is connected with the second doctor blade holder, the second doctor blade is connected with the second doctor blade holder, and the cutting edge of the second doctor blade is adjustably arranged in cooperation with the second plate roller; the second feeding assembly at least comprises a second trough; The first plate roller and the second plate roller are arranged in front of and behind the frame and are rotationally connected with the frame, the running directions of the first plate roller and the second plate roller are the same, and the working surfaces of the first plate roller and the second plate roller are in contact with the same surface of the substrate; The common pressure roller is arranged above or below the first plate roller and the second plate roller, the common pressure roller is rotationally connected with the frame through bearings arranged at both ends of the common pressure roller, the common pressure roller is an elastic rubber roller, and the common pressure roller is arranged in pressure with the first plate roller and the second plate roller in a disengageable manner; The two shaft ends of the common pressure roller are connected with pressure devices respectively, the pressure devices are used for adjusting the pressure and position of the common pressure roller; the pressure devices and the shaft ends of the common pressure roller are drivingly connected through a position alignment assembly, so that when the common pressure roller and the first plate roller or the second plate roller are unevenly stressed, the position alignment assembly adjusts the angular posture of the common pressure roller, and the common pressure roller runs stably; The method also comprises a dyeing method based on the double printing machine, and the method comprises the following steps: Step A, the substrate is printed with dyes or fixing agents on the front surface at the first printing device of the double printing machine; Step B, without drying, the fixing agents or dyes are printed on the front surface at the second printing device of the same double printing machine; Step C, the substrate treated in steps A and B is dried; Step D, the dried substrate is collected as a finished product.

2. The double-sided printer of claim 1, wherein, The common pressure roller is connected with a lifting device, the lifting device is connected with the frame, the common pressure roller is rotatably connected with the lifting device through bearings arranged at shaft ends of the common pressure roller, and the common pressure roller is press-rolled with the first plate roller and the second plate roller through the lifting device.

3. The double-sided printer of claim 1, wherein, The double-plate printing assembly is provided with two groups, each of the two groups of double-plate printing assemblies comprises the first printing device and the second printing device, the two groups of double-plate printing assemblies are arranged in front of and behind each other, and each of the double-plate printing assemblies is provided with a corresponding heating device at an output side of the double-plate printing assembly; the substrate sequentially passes through the first group of double-plate printing assemblies and the second group of double-plate printing assemblies, and the double-plate printing machine is used for continuously printing and drying the same side of the substrate.

4. The double-sided printer of claim 1, wherein, The double-plate printing assembly is provided with two groups, each of the two groups of double-plate printing assemblies comprises the first printing device and the second printing device, the two groups of double-plate printing assemblies are arranged in front of and behind each other according to a process flow, and are mirror image arranged; the running directions of the two groups of double-plate printing assemblies are opposite, the output directions of the double-plate printing assemblies are provided with corresponding heating devices, and the corresponding heating devices of the two groups of double-plate printing assemblies are arranged above and below and in a same heating box; the substrate sequentially passes through the first group of double-plate printing assemblies and the second group of double-plate printing assemblies, and the double-plate printing machine is used for sequentially printing and drying the front and back sides of the substrate.

5. The double-sided printer of claim 1, wherein, The double-plate printing assembly is provided with four groups, each of the four groups of double-plate printing assemblies comprises the first printing device and the second printing device, the four groups of double-plate printing assemblies are arranged in front of and behind each other according to a process flow, the first group and the third group of double-plate printing assemblies are mirror image arranged in front of and behind the second group and the fourth group of double-plate printing assemblies, the running directions of the first group and the third group of double-plate printing assemblies are the same, and the first group and the third group of double-plate printing assemblies are used for printing the front side of the substrate; the running directions of the second group and the fourth group of double-plate printing assemblies are the same and opposite to the running directions of the first group and the third group of double-plate printing assemblies, and the second group and the fourth group of double-plate printing assemblies are used for printing the back side of the substrate; the output directions of the double-plate printing assemblies are provided with corresponding heating devices, and the corresponding heating devices of the four groups of double-plate printing assemblies are arranged above and below and in a same heating box; the substrate sequentially passes through the first group of double-plate printing assemblies, the second group of double-plate printing assemblies, the third group of double-plate printing assemblies, and the fourth group of double-plate printing assemblies, and the double-plate printing machine is used for continuously printing and drying the front and back sides of the substrate.

6. The double-sided printer of claim 1, wherein, The first tank is arranged below the first plate roller, the lower part of the first plate roller is immersed in the working liquid in the first tank, and the first tank is integrally arranged with the first tool holder, that is, the tank body of the first tank is the first tool holder, and the first scraper blade is connected and arranged at the end of the first tool holder, and the cutting edge is arranged in cooperation with the first plate roller. The second trough is arranged below the second plate roller, the lower part of the second plate roller is immersed in the working liquid in the second trough, and the second trough is arranged integrally with the second knife holder, that is, the trough body of the second trough is the second knife holder, and the second scraper blade is connected and arranged at the end of the second knife holder and cooperated with the second plate roller; The first left-right swing device is arranged between the first scraper blade and the rack, one end of the first left-right swing device is connected with the first knife holder, and the other end is connected with the rack through a connecting piece; the first left-right swing device drives the first scraper blade to make left-right reciprocating motion; The second left-right swing device is arranged between the second scraper blade and the rack, one end of the second left-right swing device is connected with the second knife holder, and the other end is connected with the rack through a connecting piece; the second left-right swing device drives the second scraper blade to make left-right reciprocating motion.

7. The double-sided printer of claim 6, wherein, The first trough lifting device is further arranged between the first trough and the rack, one end of the first trough lifting device is connected with the rack, and the other end of the first trough lifting device is connected with the first trough; the first trough lifting device is any one of a pneumatic device, a hydraulic device, a worm and gear device or a gear and rack device; the contact degree between the first scraper blade and the first plate roller is adjusted by adjusting the lifting degree of the first trough lifting device; The first air bag device is arranged between the first trough and the first trough lifting device, the first air bag device comprises a first air bag and a supporting and fixing device of the first air bag, the first air bag device transmits the force of the first trough lifting device to the first trough, and then to the first scraper blade and the first plate roller; the first air bag is one or more; The second trough lifting device is further arranged between the second trough and the rack, one end of the second trough lifting device is connected with the rack, and the other end of the second trough lifting device is connected with the second trough; the second trough lifting device is any one of a pneumatic device, a hydraulic device, a worm and gear device or a gear and rack device; the contact degree between the second scraper blade and the second plate roller is adjusted by adjusting the lifting degree of the second trough lifting device; The second air bag device is arranged between the second trough and the second trough lifting device, the second air bag device comprises a second air bag and a second supporting and fixing device, the second air bag device transmits the force of the second trough lifting device to the second trough, and then to the second scraper blade and the second plate roller; the second air bag is one or more.

8. The double-sided printer of claim 1, wherein, The first and second rollers are fixed on the frame in turn, the first knife holder is arranged in front of the first roller, the first scraper blade is arranged obliquely downward, the cutting edge of the first scraper blade is arranged in adjustable gap abutment with the first roller, with the rotation of the first roller, the first scraper blade scrapes off the excess working fluid on the surface of the first roller, the first scraper assembly is arranged integrally with the first trough and arranged in front of the first roller, the interval between the first scraper assembly and the first roller is the first trough area, the working fluid is delivered to the upper part between the first scraper blade and the first roller through the first pump and pipeline; The second trough is arranged below the second scraper blade and the second roller, the lower part of the second roller is immersed in the working fluid in the second trough, the second knife holder is arranged in front of the second roller, the second scraper blade is arranged obliquely upward, the cutting edge of the second scraper blade is arranged in adjustable gap abutment with the second roller, with the rotation of the second roller, the second scraper blade scrapes off the excess working fluid on the surface of the second roller; The common pressure roller is arranged above the first and second rollers, the common pressure roller is arranged in clutchable pressure rolling with the first and second rollers, the substrate passes between the common pressure roller and the first and second rollers in turn, the pressure of the common pressure roller presses and transfers the remaining working fluid on the surfaces of the first and second rollers to the surface of the substrate.

9. The double-sided printer of claim 1, wherein, The first and second rollers are both gravure rollers, the second scraper assembly is a second pressure roller assembly, the second pressure roller assembly comprises a second pressure roller and a pressure adjusting device, the pressure adjusting device is a second trough advancing and retreating adjusting device, the surface of the second pressure roller is covered with elastic material, the outer cylindrical surface of the second pressure roller is the cutting edge of the second scraper blade, the second pressure roller is arranged in adjustable pressure abutment in front of the second roller, the upper part between the second pressure roller and the second roller forms the second trough, with the rotation of the second roller, the second pressure roller extrudes the excess working fluid on the surface of the second roller, only the working fluid in the concave part of the surface of the gravure roller remains; the common pressure roller is arranged in clutchable pressure rolling above the side of the second roller, the substrate passes between the common pressure roller and the second roller, the common pressure roller presses and transfers the remaining working fluid on the surface of the second roller to the surface of the substrate.

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