A printing device and printing process for water-based ink decorative paper

Abstract

The present application relates to the technical field of printing equipment, and discloses a printing equipment suitable for water-based ink decorative paper and a printing process thereof, which comprises a printing unit, a multi-mode composite drying unit and a cooling and shaping mechanism arranged in sequence. The drying unit comprises three stages of infrared short-wave preheating, medium-wave infrared curing and heat pump circulating air drying in sequence, so that efficient and energy-saving complete drying is realized. The cooling and shaping mechanism drives the crank push rod mechanism by a driving motor, so that the upper and lower cooling plate pieces make opposite reciprocating motion, and the paper is dynamically cooled and flattened in a rubbing mode. The height of the upper cooling plate piece can be precisely adjusted by a self-adaptive flattening assembly driven by a servo motor. The present application solves the problems of penetration, drying and warping in water-based ink printing, significantly improves the color saturation, surface wear resistance and dimensional stability of the printed matter, and has the advantages of energy saving, high adaptability and stable operation.

Description

Technical Field

[0001] This invention relates to the field of printing equipment technology, specifically to a printing equipment and printing process suitable for water-based ink decorative paper. Background Technology

[0002] With increasingly stringent environmental regulations and growing consumer awareness of environmental protection, the application of water-based inks in the decorative paper printing field has become an irreversible trend due to their advantages such as low VOC emissions and non-toxicity and odorlessness.

[0003] Currently, Chinese patent application number CN201910116539.6 discloses a high-speed electronic shaft printing machine for water-based inks, including a machine housing, a printing box, a first drive roller, a take-up roller, a second drive roller, a guide roller, and a base. A machine housing is mounted on the upper end of the base. Guide rollers are arranged between the machine housings. A printing box is located above and in front of the machine housing where the guide roller is located. A first drive roller is located in front of the machine housing where the printing box is located. An infrared sensor is mounted on the first drive roller. An oven is located below and in front of the machine housing where the first drive roller is located. A second drive roller is located below and in front of the machine housing where the oven is located. A take-up roller is located below and in front of the machine housing where the second drive roller is located. A printing pool is mounted on the upper end of the base directly below the printing box. By incorporating an oven, ink plate, and air spring, the problems of needing to dry the printed material after printing and incomplete printing, which lead to waste of printing materials, are solved in electronic shaft printing machines.

[0004] However, the drying methods of existing printing equipment are relatively simple, making it difficult to simultaneously optimize drying efficiency, energy consumption, and the physical properties of the ink layer. Furthermore, after efficient drying, the temperature of the decorative paper is relatively high, and the resin and polymer molecular chains in the water-based ink are still in an active state. Immediate winding can easily lead to ink layer adhesion and scratches, and the internal stress of the material is not easy to eliminate, which can easily cause deformation after winding, affecting the printing quality of the finished decorative paper. Summary of the Invention

[0005] The purpose of this invention is to provide a printing device and printing process suitable for water-based ink decorative paper, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a printing device suitable for water-based ink decorative paper, comprising a frame, a conveying unit, a controller, a printing unit, an infrared short-wave preheating module, a mid-wave infrared main drying module, a circulating air heat pump drying module, and a cooling and shaping mechanism. The conveying unit is horizontally mounted on the upper middle side of the frame, and a controller is located in front of the conveying unit. A printing unit for printing on the decorative paper is located on the top left side of the conveying unit. A multi-mode composite drying unit is located on the right side of the printing unit, and a cooling and shaping mechanism is located on the right side of the multi-mode composite drying unit. The cooling and shaping mechanism includes a frame whose bottom is fastened to the frame. A driving structure is mounted on the front side of the frame. The upper and lower sides of the rear of the driving structure drive a leveling structure and a sliding seat to move in opposite directions. A positioning plate is locked and fixed to the top of the sliding seat. A lower cooling plate is embedded inside the positioning plate. The leveling structure is located above the lower cooling plate and is fixed to the frame on its upper left side.

[0007] Preferably, the multi-mode composite drying unit comprises, in sequence along the paper travel direction:

[0008] The infrared short-wave preheating module is used to rapidly heat up the initial water-based ink and initially inhibit penetration.

[0009] Mid-wave infrared main drying module is used for deep curing of ink layers;

[0010] The circulating air heat pump drying module is used to provide hot air with controllable temperature and wind speed to remove moisture and complete the final drying.

[0011] Preferably, the printing unit's printing roller is an electrostatic assisted printing roller, which has an internal electrostatic generator for applying an adsorption electrostatic force to the substrate.

[0012] Preferably, the sliding seat is provided with rotating wheels on all four sides, and the bottom of each of the four rotating wheels is in contact with and slides against the frame.

[0013] Preferably, the drive structure includes a drive motor that is locked and fixed to the frame on the left side. The top output shaft of the drive motor is connected to a pulley assembly. A vertical rod is fixedly connected above the output of the pulley assembly. The vertical rod passes through and rotates inside two support blocks. A lower rotating plate is connected to the top of the vertical rod. A first push rod is connected to the top of the lower rotating plate away from the vertical rod. An upper rotating plate is rotatably connected to the top of the connection between the first push rod and the lower rotating plate. A second push rod is rotatably connected to the top of the upper rotating plate away from the connection with the first push rod. The rear sides of both support blocks are fastened to the frame. The rear end of the first push rod is rotatably connected to the lower sliding seat. The rear end of the second push rod is rotatably connected to the leveling structure.

[0014] Preferably, the leveling structure includes a carrier, on the left side of which a rectangular frame is integrally formed, and rollers are rotatably connected to the four sides inside the rectangular frame. The four rollers are divided into two groups, one at the top and one at the bottom. An upper guide rod is slidably connected to the bottom side of the upper group of rollers, and a lower guide rod is slidably connected to the top side of the other group of rollers at the bottom. The upper and lower guide rods are fixed to the frame on both the front and rear sides. The top right side of the carrier is connected to the rectangular frame through a support rod. An adaptive leveling component is provided through the middle side inside the carrier.

[0015] Preferably, the adaptive flattening assembly includes a rectangular base embedded and fixed to the top center of the carrier. A protective cover is locked and fixed to the top center of the rectangular base. A servo motor is disposed inside the center of the protective cover. A screw is connected to the bottom output shaft of the servo motor. An internal thread block is threaded to the outer surface of the screw. The internal thread block is fixed through and fixed to the center of the positioning frame. An upper cooling plate is locked and fixed to the bottom of the positioning frame. The upper cooling plate is located below the rectangular base. A first connecting pipe and a second connecting pipe are respectively connected to the left and right sides of the top of the upper cooling plate. The first connecting pipe and the second connecting pipe slide through and slide through the left and right sides of the carrier.

[0016] Preferably, the upper and lower cooling plates have the same structure and size and are arranged facing each other. The lower cooling plate includes a hollow plate with negative pressure adsorption holes on its working surface and a cooling channel cavity inside. A hemispherical protrusion is provided on one side of the working surface of the cooling hollow plate. The negative pressure adsorption holes and the cooling hollow plate are arranged in an alternating pattern. The inlet and outlet of the cooling channel cavity of the lower cooling plate are connected to an external cooling water system through flexible pipes, and its negative pressure adsorption holes are connected to an external vacuum generator. The inlet and outlet of the cooling channel cavity of the upper cooling plate are connected to a first connecting pipe and a second connecting pipe, respectively, and both the first and second connecting pipes are connected to an external cooling water system through flexible pipes. The negative pressure adsorption holes of the upper cooling plate are connected to an external vacuum generator.

[0017] In addition, the present invention also provides a printing process suitable for water-based ink decorative paper, which uses the above-mentioned printing equipment and includes the following steps:

[0018] S1. After being unwound, the decorative paper substrate is conveyed to the printing unit via the conveying unit;

[0019] S2. In the printing unit, water-based ink is used to print on the decorative paper; wherein, the printing roller adsorbs the decorative paper under electrostatic assistance to ensure smooth printing;

[0020] S3. The printed decorative paper enters the multi-mode composite drying unit, and passes through the infrared short-wave preheating module for rapid heating, the medium-wave infrared main drying module for deep curing, and the circulating air heat pump drying module for final drying and discharge of water vapor.

[0021] S4. After drying, the decorative paper enters the cooling and shaping mechanism. The drive structure drives the lower slide and the leveling structure to move in opposite directions, which drives the lower cooling plate and the upper cooling plate to perform double-sided dynamic cooling and leveling of the decorative paper.

[0022] S5. The cooled and shaped decorative paper is wound up by a winding device.

[0023] Preferably, in step S4, the cooling water temperature of the upper and lower cooling plates is controlled at 15-25℃; the reciprocating motion frequency of the sliding seat and the leveling structure is 50-200 times / minute; the negative pressure adsorption of the lower cooling plate is continuously activated, and the negative pressure adsorption of the upper cooling plate is pulsed to start and stop according to its movement position.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] This invention systematically solves many quality problems in water-based ink-printed decorative paper by integrating electrostatic assisted printing, multi-stage synergistic drying, and dynamic double-sided cooling and leveling. Electrostatic adsorption fundamentally ensures the flatness and stability of the substrate during printing, laying a solid foundation for ultra-precision registration and completely eliminating defects such as ghosting and misregistration. The multi-mode drying unit applies energy in stages "from the surface to the inside," first quickly sealing the surface of the ink layer to lock in color and enhance vibrancy, then deeply curing to ensure the mechanical properties of the ink layer, and finally efficiently removing moisture, all of which together ensure the color saturation, clarity, high hardness, and strong abrasion resistance of the printed pattern. In addition, the cooling and leveling mechanism, by simulating the physical action of "rubbing," efficiently eliminates the internal stress and warping deformation generated in the paper after drying, enabling the finished decorative paper to achieve unprecedented flatness and dimensional stability, greatly improving the product grade and yield.

[0026] This invention first utilizes infrared radiation to efficiently and directionally heat the ink layer internally, resulting in high energy utilization. Subsequently, a heat pump circulating air system not only efficiently evaporates and removes water vapor during the final drying stage but also recovers low-grade waste heat generated during the drying process for preheating fresh air, achieving cascaded energy utilization. Compared to traditional pure electric or gas-fired heating drying methods, energy consumption is significantly reduced. Furthermore, the cooling and shaping process mainly relies on circulating water cooling and mechanical leveling, avoiding the use of high-power compressors and other energy-intensive methods, further saving energy. The entire system improves production efficiency while effectively reducing the overall energy consumption and carbon emissions per unit product, achieving both economic and environmental benefits.

[0027] The printing equipment of this invention possesses intelligent adaptability. Its adaptive flattening component in the cooling and setting mechanism can precisely adjust the pressure of the upper cooling plate according to the thickness of the decorative paper via a servo system, thereby adapting to decorative paper products of different weights, from thin to thick. This provides a wide process window and broad application range. The high synchronization of the opposing movements of the upper and lower cooling plates provides an extremely stable transmission path and uniform force for the paper during operation, effectively preventing operational malfunctions such as paper jams, wrinkles, and misalignment. This enables the equipment to not only stably produce high-quality products under various process parameters but also ensures the smoothness and reliability of continuous production processes, minimizing downtime for adjustments and thus improving overall production efficiency and output. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the cooling and shaping mechanism of the present invention;

[0030] Figure 3 This is a schematic diagram of the structure of the cooling plate component under the present invention;

[0031] Figure 4 This is a schematic diagram of the driving structure of the present invention;

[0032] Figure 5 This is a rear view schematic diagram of the connection between the first push rod, the upper rotating plate, and the second push rod of the present invention;

[0033] Figure 6 This is a schematic diagram of the leveling structure of the present invention;

[0034] Figure 7 This is a schematic diagram of the adaptive flattening component of the present invention.

[0035] In the diagram: Frame-1, Conveying Unit-2, Controller-3, Printing Unit-4, Infrared Shortwave Preheating Module-5, Medium-Wave Infrared Main Drying Module-6, Circulating Air Heat Pump Drying Module-7, Cooling and Shaping Mechanism-8, Frame-81, Drive Structure-82, Slide Seat-83, Positioning Plate-84, Lower Cooling Plate-85, Leveling Structure-86, Hollow Plate-851, Negative Pressure Adsorption Hole-852, Cooling Channel Cavity-853, Drive Motor-821, Pulley Set-822, Upright Post-823, Support Block -824, Lower rotating plate -825, First push rod -826, Upper rotating plate -827, Second push rod -828, Carrier -861, Roller -862, Upper guide rod -863, Lower guide rod -864, Support rod -865, Adaptive flattening assembly -866, Rectangular seat -8661, Protective cover -8662, Servo motor -8663, Screw -8664, Internal threaded block -8665, Positioning frame -8666, Upper cooling plate -8667, First connecting pipe -8668, Second connecting pipe -8669. Detailed Implementation

[0036] To further explain the technical solution of the present invention, a detailed description is provided below through specific embodiments.

[0037] Please see Figure 1 This invention provides a printing device suitable for water-based ink decorative paper, including a frame 1, a conveying unit 2, a controller 3, a printing unit 4, an infrared short-wave preheating module 5, a mid-wave infrared main drying module 6, a circulating air heat pump drying module 7, and a cooling and shaping mechanism 8. The conveying unit 2 is horizontally mounted on the upper middle side of the frame 1, and the controller 3 is located in front of the conveying unit 2. The printing unit 4 for printing decorative paper is located on the top left side of the conveying unit 2. The printing roller of the printing unit 4 is an electrostatic assisted printing roller, which has an internal electrostatic generator for applying an adsorption electrostatic force to the substrate. An electrostatic field is used to ensure that the decorative paper adheres tightly to the surface of the printing roller, effectively preventing misregistration and ghosting caused by paper warping or misalignment during printing, and significantly improving printing accuracy. A multi-mode composite drying unit is set on the right side of the printing unit 4, which can immediately cure the wet ink after printing to prevent ink penetration and diffusion and paper deformation, ensuring the immediacy of printing quality. A cooling and shaping mechanism 8 is set on the right side of the multi-mode composite drying unit, which cools and shapes the paper immediately after drying, which can quickly reduce the paper temperature, fix the ink layer shape, eliminate internal stress, and provide a dimensionally stable and surface-flat semi-finished product for subsequent winding.

[0038] The multi-mode composite drying unit includes, in sequence along the paper's travel direction:

[0039] The infrared short-wave preheating module 5 is used to rapidly heat up the initial water-based ink. Utilizing the strong penetrating power and rapid heating characteristics of infrared short waves, it instantly forms a skin on the surface of the ink film, locks in the internal moisture, and moves it in the set direction, effectively preventing the ink from excessively penetrating into the paper fibers, which would cause the image to become blurry and the colors to become dull.

[0040] The mid-wave infrared main drying module 6 uses mid-wave infrared energy to heat the ink and the substrate evenly, promoting the cross-linking polymerization reaction of water-based resin, achieving deep and thorough curing of the ink layer, and ensuring the hardness and wear resistance of the ink.

[0041] The circulating air heat pump drying module 7 uses a controllable hot air circulation system to efficiently evaporate and remove water vapor generated in the previous drying process, ensuring that the ink is completely dried. At the same time, the heat pump can recover some energy, improve energy utilization efficiency, and reduce energy consumption.

[0042] Please see Figure 1 and Figure 2 This invention provides a printing device suitable for water-based ink decorative paper. The cooling and shaping mechanism 8 includes a frame 81 whose bottom is fixed to the frame 1. A drive structure 82 is installed on the front side of the frame 81. The upper and lower sides of the rear of the drive structure 82 drive the leveling structure 86 and the sliding seat 83 to move in opposite directions back and forth. This can apply dynamic and opposite flattening forces to the upper and lower surfaces of the decorative paper at the same time, like "rubbing", which can effectively eliminate the warping and internal stress that may exist in the paper after drying.

[0043] A positioning plate 84 is locked and fixed to the top of the sliding seat 83. A lower cooling plate 85 is embedded inside the positioning plate 84. The positioning plate 84 ensures the rigidity and precision of the connection between the sliding seat 83 and the lower cooling plate 85, and ensures the accuracy of the working position of the lower cooling plate 85. Rotary wheels are rotatably provided on all four sides of the sliding seat 83, and the four rotary wheels slide in cooperation with the bottom support guide rail formed by the frame 81. This greatly reduces the frictional resistance of the sliding seat 83 during reciprocating motion, ensuring its smooth and light movement, and reducing drive power consumption and wear. The leveling structure 86 is located above the lower cooling plate 85, and the upper left of the leveling structure 86 is fixed to the frame 81. This ensures that the main body position of the leveling structure 86 relative to the frame 81 is stable, allowing the internal components to perform precise back-and-forth reciprocating motion relative to this stable reference.

[0044] Please see Figure 2 , Figure 4 and Figure 5The present invention provides a printing device suitable for water-based ink decorative paper. The drive structure 82 includes a drive motor 821 that is locked and fixed to the frame 81 on the left side. The top output shaft of the drive motor 821 is connected to a pulley group 822. A vertical rod 823 is fixedly connected above the output of the pulley group 822. The drive motor 821 is used as a power source. The pulley group 822 causes the vertical rod 823 to convert the rotational motion into a rotational central shaft that can be used to install a crank.

[0045] The upright 823 rotates through the two support blocks 824, and the rear sides of the support blocks 824 are fastened to the frame 81, providing a stable and reliable rotational support for the upright 823, ensuring its rotational concentricity, and reducing vibration and sway. The top of the upright 823 is connected to a lower rotating plate 825, and the top of the lower rotating plate 825 away from the upright 823 is connected to a first push rod 826. The lower rotating plate 825 acts as a first-stage crank, and the first push rod 826 converts the swing of the lower rotating plate 825 into linear motion to drive the lower slide seat 83.

[0046] The top of the connection between the first push rod 826 and the lower rotating plate 825 is rotatably connected to an upper rotating plate 827, and the top of the upper rotating plate 827 away from the connection with the first push rod 826 is rotatably connected to a second push rod 828. The fulcrum of the upper rotating plate 827 is set on the hinge point of the first push rod 826, so that the movements of the upper and lower rotating plates are linked and opposite in phase. The second push rod 828 converts the swing of the upper rotating plate 827 into linear motion. The rear end of the first push rod 826 is rotatably connected to the lower sliding seat 83, transmitting the linear thrust of the first push rod 826 to the lower sliding seat 83, driving it to perform reciprocating linear motion in the front-back direction. The rear end of the second push rod 828 is rotatably connected to the leveling structure 86, transmitting the linear thrust of the second push rod 828 to the corresponding component in the leveling structure 86, driving it to perform reciprocating motion in the opposite direction to the lower sliding seat 83.

[0047] Please see Figure 2 , Figure 3 , Figure 6 and Figure 7This invention provides a printing device suitable for water-based ink decorative paper. The leveling structure 86 includes a carrier 861. A rectangular frame is integrally formed on the left side of the carrier 861, and rollers 862 are rotatably connected to all four sides inside the rectangular frame. The four rollers 862 are divided into two groups. The upper group of rollers 862 is slidably connected to an upper guide rod 863 on its bottom side, and the lower group of rollers 862 is slidably connected to a lower guide rod 864 on its top side. The upper and lower groups of rollers are respectively constrained to the upper and lower guide rods, forming a stable kinematic pair that precisely guides the leveling structure 86. The entire structure reciprocates in a straight line to prevent deflection or jamming. The upper guide rod 863 and the lower guide rod 864 are fixed to the frame 81 on both the front and rear sides. The top right side of the carrier 861 is connected to the rectangular frame through the support rod 865, providing a precise reference track for the movement of the leveling structure 86. An adaptive leveling component 866 is installed through the middle of the carrier 861. The adaptive leveling component 866 has a lifting function, which allows for independent fine adjustment of the pressure of the upper cooling plate 8667 on the paper during dynamic leveling, and can adapt to decorative paper of different thicknesses.

[0048] The adaptive flattening component 866 includes a rectangular base 8661 embedded and fixed to the top center of the carrier 861. A protective cover 8662 is locked and fixed to the top center of the rectangular base 8661. A servo motor 8663 is arranged inside the center of the protective cover 8662. A screw 8664 is connected to the bottom output shaft of the servo motor 8663. An internal thread block 8665 is threaded to the outer surface of the screw 8664. The servo motor 8663 is used as a power source to make the screw 8664 rotate and drive the internal thread block 8665 to make precise linear displacement.

[0049] The internal threaded block 8665 is fixed inside the middle of the positioning frame 8666, and the upper cooling plate 8667 is locked and fixed at the bottom of the positioning frame 8666. The positioning frame 8666 transmits the linear movement of the internal threaded block 8665 to the upper cooling plate 8667, so that it can move up and down precisely. The upper cooling plate 8667 is located below the rectangular base 8661, and the top left and right sides of the upper cooling plate 8667 are respectively connected to the first pipe 8668 and the second pipe 8669. The first pipe 8668 and the second pipe 8669 slide through the left and right sides of the base 861. The through design of the two pipes allows them to change position when the upper cooling plate 8667 moves up and down, ensuring that the cooling medium flows through the first pipe 8668 and the second pipe 8669 into the interior of the upper cooling plate 8667.

[0050] The upper cooling plate 8667 and the lower cooling plate 85 have the same structure and size and are arranged facing each other, which ensures that the cooling effect and force on the upper and lower surfaces of the decorative paper are uniform and consistent, and prevents new deformation caused by uneven cooling. The lower cooling plate 85 includes a hollow plate 851, and a negative pressure adsorption hole 852 is provided on the working surface of the hollow plate 851. A cooling channel cavity 853 is provided inside the hollow plate 851. The cooling channel cavity 853 is responsible for heat exchange and flattening the decorative paper during its reciprocating motion. The negative pressure adsorption hole 852 is responsible for generating adsorption force to adsorb the paper.

[0051] The cooling hollow plate 851 has hemispherical protrusions on one side of the working surface. These hemispherical protrusions can form tiny contact points with the decorative paper to assist in heat transfer and leveling, and can also form tiny airflow channels between the decorative paper and the plate surface during adsorption. This is conducive to the rapid establishment and uniform distribution of vacuum adsorption and avoids the formation of adsorption dead zones. The negative pressure adsorption holes 852 and the cooling hollow plate 851 are arranged in an alternating pattern to ensure that the cooling area and adsorption area are evenly distributed on the plane. This ensures that the paper can obtain a uniform cooling effect and stable adsorption force throughout the entire plate surface area, avoiding local overheating or uneven adsorption.

[0052] The inlet and outlet of the cooling channel cavity 853 of the lower cooling plate 85 are connected to an external cooling water system via flexible pipes, and its negative pressure adsorption hole 852 is connected to an external vacuum generator to ensure that the cooling and adsorption functions remain effective during dynamic operation. The inlet and outlet of the cooling channel cavity 853 of the upper cooling plate 8667 are connected to the first connecting pipe 8668 and the second connecting pipe 8669 respectively, and both the first connecting pipe 8668 and the second connecting pipe 8669 are connected to an external cooling water system via flexible pipes to meet the combined motion requirements of the upper cooling plate 8667's own lifting and reciprocating motion with the leveling structure 86. The negative pressure adsorption hole 852 of the upper cooling plate 8667 is connected to an external vacuum generator, thereby achieving continuous adsorption of the decorative paper below and pulse adsorption above through the negative pressure adsorption holes 852 on both the upper and lower sides.

[0053] The present invention provides a printing process for water-based ink decorative paper, which employs the above-mentioned printing equipment and includes the following steps:

[0054] S1. After being unwound, the decorative paper substrate is conveyed to the printing unit 4 through the conveying unit 2, realizing continuous and automated unwinding and conveying of the roll material;

[0055] S2. In printing unit 4, water-based ink is used to print on decorative paper; wherein, the printing roller adsorbs the decorative paper under electrostatic assistance to ensure smooth printing;

[0056] S3. The printed decorative paper enters the multi-mode composite drying unit, and sequentially passes through the infrared short-wave preheating module 5 for rapid heating, the medium-wave infrared main drying module 6 for deep curing, and the circulating air heat pump drying module 7 for final drying and discharge of water vapor.

[0057] S4. After drying, the decorative paper enters the cooling and shaping mechanism 8. The drive structure 82 drives the lower slide seat 83 and the leveling structure 86 to move in opposite directions, causing the lower cooling plate 85 and the upper cooling plate 8667 to perform double-sided dynamic cooling and leveling of the decorative paper. The cooling water temperature of the upper cooling plate 8667 and the lower cooling plate 85 is controlled at 15-25℃. The reciprocating motion frequency of the lower slide seat 83 and the leveling structure 86 is 50-200 times / minute. The negative pressure adsorption of the lower cooling plate 85 is continuously activated, and the negative pressure adsorption of the upper cooling plate 8667 is pulsed to start and stop according to its movement position.

[0058] S5. After cooling and setting, the decorative paper is wound up by a winding device to obtain a high-quality finished roll material that is fully cooled, dimensionally stable, has a smooth surface, no internal stress, and can be immediately processed or packaged.

[0059] The specific working principle of the printing equipment described above is as follows:

[0060] First, the equipment smoothly conveys the decorative paper substrate to the printing unit 4 through the conveying unit 2. The printing roller of this unit is an electrostatic assisted printing roller, which integrates an electrostatic generator inside. It can form a strong electrostatic field on its surface, so that the decorative paper is evenly adsorbed on the roller surface due to electrostatic induction. This effectively overcomes the stiffness, warping and vibration of the paper itself during high-speed operation, and provides an absolutely flat and stable printing base for subsequent high-precision printing.

[0061] Secondly, after printing, the decorative paper immediately enters the multi-mode composite drying unit for phased synergistic curing. First, it passes through the infrared short-wave preheating module 5, where short-wave infrared energy can instantly penetrate the ink layer, causing the surface to quickly gel and form a sealing film, locking in internal moisture and inhibiting its excessive penetration into the fibers, thereby preserving the saturation and clarity of the colors. Subsequently, the medium-wave infrared main drying module 6 provides uniform and deep heat energy, promoting the cross-linking polymerization reaction of the water-based resin to achieve deep and thorough curing of the ink layer, in order to obtain the required hardness and abrasion resistance. Finally, the circulating air heat pump drying module 7 uses controllable hot air to efficiently sweep the paper surface, removing the water vapor generated during the curing process, ensuring that the ink layer is completely dry, while the heat pump recovers the waste heat.

[0062] Third, the adaptive flattening component 866 integrated in the flattening structure 86 can precisely adjust the height of the upper cooling plate 8667 by driving the screw 8664 and the internal thread block 8665 through the servo motor 8663, thereby intelligently adapting to different paper thicknesses and controlling the flattening pressure; the fully dried decorative paper then enters the cooling and shaping mechanism 8, passing through the inside of the lower cooling plate 85 and the upper cooling plate 8667. The drive motor 821 of this mechanism drives the lower slide seat 83 and the flattening structure 86 to carry the lower cooling plate through the pulley group 822 and the crank push rod mechanism composed of the upright 823, the lower rotating plate 825, the first push rod 826, the upper rotating plate 827 and the second push rod 828. The lower cooling plate 85 and the upper cooling plate 8667 reciprocate in opposite phases and synchronously. The lower cooling plate 85 continuously applies negative pressure to adsorb and provide a stable reference surface for the paper's movement. The upper cooling plate 8667 starts and stops the negative pressure in a pulsed manner according to its movement position. When it moves above the decorative paper, it adsorbs the paper for cooling contact. The cooling channel cavity 853 inside the upper and lower plates is filled with constant temperature cold water to quickly remove heat, fix the ink layer shape, and prevent sticking after winding. Furthermore, the opposite reciprocating motion of the two plates applies dynamic friction forces in opposite directions to the upper and lower surfaces of the paper at the same time, producing a highly efficient "rubbing" effect, which can completely eliminate the internal stress and micro warping generated during the drying process.

[0063] Fourth, finally, the treated decorative paper is in the optimal state of being fully cooled, stress-free, dimensionally stable, and with an ultra-flat surface. It is then wound up by the winding device under constant tension control into a high-quality finished roll, realizing the high-quality, high-efficiency, and high-stability production of water-based ink decorative paper.

[0064] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A printing device suitable for water-based ink decorative paper, comprising a rack (1), a conveying unit (2) is transversely installed on the top middle side of the rack (1), and a controller (3) is arranged on the front side of the conveying unit (2), and a printing unit (4) for printing decorative paper is arranged on the top left side of the conveying unit (2), characterized in that: The printing unit (4) is provided with a multi-mode composite drying unit on the right side, and a cooling and shaping mechanism (8) is arranged on the right side of the multi-mode composite drying unit, the cooling and shaping mechanism (8) comprises a frame (81) which is fastened to the rack (1) at the bottom, a driving structure (82) is arranged on the front side of the frame (81), the driving structure (82) drives the opposite direction movement of the flattening structure (86) and the lower slide seat (83) to reciprocate forward and backward on the upper and lower sides of the rear part respectively, the lower slide seat (83) is locked and fixed on the top of the positioning plate (84), the lower cooling plate (85) is embedded on the inner side of the positioning plate (84), the flattening structure (86) is located above the lower cooling plate (85), and the left upper side of the flattening structure (86) is fixed to the frame (81); The flattening structure (86) comprises a carrier (861), a rectangular frame is integrally formed on the left side of the carrier (861), and four rollers (862) are rotatably connected to the inner four sides of the rectangular frame, the four rollers (862) are divided into two groups in an upper and lower manner, the rollers (862) in the upper group are slidably connected to the upper guide rod (863) at the bottom side, the rollers (862) in the lower group are slidably connected to the lower guide rod (864) at the top side, the upper guide rod (863) and the lower guide rod (864) are fixed to the frame (81) on the front and rear sides, the carrier (861) is connected to the rectangular frame through the support rod (865) on the right side of the top, and the self-adapting flattening assembly (866) is arranged through the inside of the carrier (861) on the middle side; The driving structure (82) comprises a driving motor (821) which is locked and fixed to the frame (81) on the left side, a belt pulley group (822) is connected to the top output shaft of the driving motor (821), a vertical rod (823) is fixedly connected above the output of the belt pulley group (822), the vertical rod (823) is rotatably arranged in the two supporting blocks (824), and a lower rotating piece (825) is connected to the top end of the vertical rod (823), a first push rod (826) is connected to the end of the lower rotating piece (825) away from the vertical rod (823) on the top, an upper rotating piece (827) is rotatably connected to the top of the first push rod (826), a second push rod (828) is rotatably connected to the end of the upper rotating piece (827) away from the first push rod (826), the rear sides of the two supporting blocks (824) are fastened to the frame (81), the rear end of the first push rod (826) is rotatably connected to the lower slide seat (83), and the rear end of the second push rod (828) is rotatably connected to the flattening structure (86). The adaptive flattening assembly (866) comprises a rectangular seat (8661) embedded and fixed in the middle side of the top of the carrier (861), a shroud (8662) is fixed and locked on the top of the middle side of the rectangular seat (8661), a servo motor (8663) is arranged in the middle side of the inside of the shroud (8662), a screw rod (8664) is connected to the bottom output shaft of the servo motor (8663), an internally threaded block (8665) is threadedly connected to the outer surface of the screw rod (8664), the internally threaded block (8665) is fixed through the inside of the middle side of the positioning frame (8666), and the bottom of the positioning frame (8666) is fixed and locked with the upper cooling plate part (8667), the upper cooling plate part (8667) is located below the rectangular seat (8661), and the first connecting pipe (8668) and the second connecting pipe (8669) are respectively connected to the left and right sides of the top of the upper cooling plate part (8667), and the first connecting pipe (8668) and the second connecting pipe (8669) are respectively slidably arranged in the left and right sides of the inside of the carrier (861).

2. The printing apparatus for water-based ink decorative paper according to claim 1, wherein: The multi-mode composite drying unit sequentially comprises, along the paper advancing direction: An infrared short-wave preheating module (5) is used for rapidly heating the initial printing water-based ink and preliminarily inhibiting penetration; A middle-wave infrared main drying module (6) is used for deeply solidifying the ink layer; A circulating air heat pump drying module (7) is used for providing controllable temperature and air speed hot air, removing water vapor and completing final drying.

3. The printing apparatus for water-based ink decorative paper according to claim 1, wherein: The printing unit (4) is an electrostatic auxiliary printing roller, and an electrostatic generator is arranged in the inside of the printing roller, which is used for applying adsorption electrostatic force to the printing object.

4. The printing apparatus for water-based ink decorative paper according to claim 1, wherein: Rotary wheels are arranged on the four sides of the lower sliding seat (83), and the bottoms of the four rotary wheels are in contact with and slide on the frame (81).

5. The printing apparatus for water-based ink decorative paper according to claim 1, wherein: The upper cooling plate part (8667) and the lower cooling plate part (85) are the same in structure and size and are oppositely arranged, the lower cooling plate part (85) comprises a hollow plate (851), a negative pressure adsorption hole (852) is formed in the working surface of the hollow plate (851), and a cooling flow channel cavity (853) is arranged in the inside of the hollow plate (851), a hemispherical protrusion is arranged on one side of the working surface of the cooling hollow plate (851), the negative pressure adsorption holes (852) and the cooling hollow plates (851) are arranged in an interlaced manner, the inlet and outlet of the cooling flow channel cavity (853) of the lower cooling plate part (85) are connected with an external cooling water system through a flexible pipeline, and the negative pressure adsorption holes (852) are connected with an external vacuum generator; the inlet and outlet of the cooling flow channel cavity (853) of the upper cooling plate part (8667) are connected with the first connecting pipe (8668) and the second connecting pipe (8669), respectively, and the first connecting pipe (8668) and the second connecting pipe (8669) are connected with the external cooling water system through flexible pipelines, and the negative pressure adsorption holes (852) of the upper cooling plate part (8667) are connected with the external vacuum generator.

6. A printing process for water-based ink decorated paper, characterized by, The printing equipment of any one of claims 1-5 comprises the following steps: S1, after the decorative paper substrate is unwound, the decorative paper substrate is conveyed to the printing unit (4) through the conveying unit (2); S2, in the printing unit (4), using water-based ink printing on the decorative paper; wherein the printing roller in the electrostatic auxiliary adsorption of decorative paper, ensure the printing flat; S3, the printed decorative paper into multi-mode composite drying unit, in turn through the infrared short wave preheating module (5) for rapid heating, medium wave infrared main drying module (6) for depth curing, circulating air heat pump drying module (7) for final drying and discharge water vapor; S4, the dried decorative paper into cooling and shaping mechanism (8), drive structure (82) drive down the slide seat (83) and leveling structure (86) to move back and forth in the opposite direction, drive the lower cooling plate (85) and the upper cooling plate (8667) to the decorative paper for double-sided dynamic cooling and leveling; S5, the cooling and shaping of the decorative paper is completed by the winding device.

7. A printing process for water-based ink decorated paper as claimed in claim 6, wherein: In step S4, the cooling water temperature of the upper cooling plate (8667) and the lower cooling plate (85) is controlled to be 15-25℃; the reciprocating frequency of the lower slide seat (83) and the leveling structure (86) is 50-200 times / min; the negative pressure adsorption of the lower cooling plate (85) is continuously opened, and the negative pressure adsorption of the upper cooling plate (8667) is pulsed according to its movement position.

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