Low-carbon and environment-friendly printing and coating process and device thereof

Abstract

The embodiment of the application discloses a kind of low carbon environmental protection printing coating processes, comprising the following steps: step 100, according to formula, raw materials are sent into mixer and mixed to be stirred to make each raw material mix fully to obtain mixed slurry;Step 200, the mixed slurry is printed and coated, and the viscosity and thickness of the printing and coating layer are tested;Step 300, the printing and coating layer that passes the test is sent into the oven and low-temperature baking;Step 400, the hardness of the printing and coating layer after baking is tested, and the printing and coating layer that passes the test is sent into finished product area;It also includes printing and coating device;The present application adopts 100-120 ℃ low-temperature drying mode to realize the production of printing and coating layer, and the production is more energy-saving and environment-friendly in the process, and the qualified rate of finished product is improved, and the product rejection rate is reduced.

Description

Technical Field

[0001] This invention relates to the field of printing and coating technology, specifically to a low-carbon and environmentally friendly printing and coating process and apparatus. Background Technology

[0002] In order to ensure the performance of traditional coatings, high-temperature curing of 170-180℃ is usually required during production. The process mainly includes the following steps: material mixing → testing on the machine (viscosity, thickness) → production on the machine → drying (180℃). The reason why the drying temperature must be controlled at around 180℃ is that the curing temperature of coating products is required to be between 170-180℃. This process is currently used in the industry.

[0003] However, the existing process takes a long time, the product yellows significantly, and this results in high costs and a high rate of damage. Furthermore, the high temperature can easily cause burn marks on the reverse side of the flower stand.

[0004] To address the issue of high-temperature curing, existing processes can be improved by using low-temperature curing technology to dry the coating. However, when using low-temperature curing technology, if the production time is during the winter when temperatures are low, the finished product will be rapidly cooled after entering the finished product line, resulting in relatively low surface hardness. Summary of the Invention

[0005] Therefore, embodiments of the present invention provide a low-carbon and environmentally friendly printing and coating process and apparatus to solve the problems of high residual rate in conventional processes and low surface hardness of products in low-temperature processes in the prior art.

[0006] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0007] A low-carbon and environmentally friendly printing and coating process includes the following steps:

[0008] Step 100: Feed the raw materials into the mixer according to the formula and mix them thoroughly to obtain a slurry.

[0009] Step 200: Apply the mixed paste to the printing plate and test the viscosity and thickness of the printed layer;

[0010] Step 300: Place the tested and qualified printing coating into the baking machine for low-temperature baking;

[0011] Step 400: Perform a hardness test on the baked printing coating and send the qualified printing coating to the finished product area.

[0012] Furthermore, the low-temperature baking temperature is 100-120℃.

[0013] In addition, the present invention also provides a printing and coating device based on the aforementioned low-carbon and environmentally friendly printing and coating process, including a printing and coating host, wherein a mixing and stirring tank is connected to the inlet end of the printing and coating host via a feeding pipe.

[0014] The printing and coating host is equipped with a synchronous conveyor at the printing and coating outlet end. A baking machine is installed on the synchronous conveyor. The synchronous conveyor feeds the printing and coating layer into the baking machine for low-temperature baking. The end of the synchronous conveyor is seamlessly connected to a finished product receiving belt, which is used to send the baked printing and coating layer into the finished product area.

[0015] A testing mechanism is installed on the synchronous conveyor.

[0016] Furthermore, the testing mechanism includes a first measuring element and a second measuring element disposed on the synchronous conveyor. The first measuring element is installed between the printing and coating host and the baking machine, and the second measuring element is installed between the baking machine and the finished product receiving belt.

[0017] The first measuring element is used to detect the viscosity and thickness of the printed coating, and the second measuring element is used to detect the hardness of the printed coating. Only printed coatings that pass all tests for viscosity, thickness and hardness can enter the finished product receiving belt.

[0018] Furthermore, the synchronous conveyor is a powered conveyor roller type conveyor belt, which includes several fixed frames and conveyor rollers that are driven to rotate synchronously by a rotating motor on the fixed frames. The conveyor rollers are connected by a connecting belt, and a gap is provided between every two adjacent conveyor rollers.

[0019] Both the first measuring element and the second measuring element are horizontally arranged on the fixed frame, and the first measuring element and the second measuring element are arranged parallel to the conveying roller.

[0020] Furthermore, a first material distribution assembly is provided between the first measuring element and the baking machine, and a second material distribution assembly is provided between the second measuring element and the finished product receiving belt. Both the first material distribution assembly and the second material distribution assembly are installed on the fixed frame through a railing structure, and do not affect the movement of the printing coating on the conveying roller.

[0021] The first material distribution assembly removes the printed coating that has not passed the detection of the measuring element from the conveying roller by rotating it.

[0022] The second material distribution component moves in the reverse direction to trace the printed coating that has not passed the detection of the two measuring elements back to the upstream position of the baking machine, thereby realizing repeated baking of the printed coating with unqualified hardness.

[0023] Furthermore, the first material distribution assembly includes a rotating grid plate rotatably mounted on the fixed frame via a fixing member. The rotating grid plate is disposed between the first measuring element and the baking machine. The rotating grid plate is composed of a plurality of rods whose ends are connected together. The rods are spaced apart from the conveying roller, and the height of the rods is lower than that of the conveying roller.

[0024] A limiting frame is horizontally arranged on the fixed frame, and the limiting frame is located above the conveying roller. A sliding rod is connected to the corner of the rotating grid plate through the fixed member and a rotating member. The sliding rod is slidably installed on the limiting frame through the first telescopic pump body.

[0025] The first telescopic pump body is communicatively connected to the first measuring element. When the first telescopic pump body extends or retracts, the rotating grid plate rotates on the conveying roller under the drive of the rotating component at the end of the sliding rod, thereby removing the unqualified printing coating.

[0026] Furthermore, the rotating component includes a driven gear mounted on the rotating grid plate, and the end of the sliding rod is provided with a gear shaft that cooperates with the driven gear;

[0027] When the gear shaft moves in the direction of the driven gear, the rotating grid plate rotates and moves away from the conveying roller; when the gear shaft moves in the opposite direction, the rotating grid plate rotates in the opposite direction and returns to below the conveying roller.

[0028] Furthermore, the driven gear is located at the four corners of the rotating grid plate, and the gear shaft is located at both ends of the sliding rod;

[0029] When the sliding rod slides to the top, the rotating grid plate rotates about the axis of the driven gear in front of it in the sliding direction.

[0030] Furthermore, the second material distribution assembly includes a track installed on the outside of the fixed frame and a movable grid plate that can slide on the track via a drive group. The movable grid plate has the same shape as the rotating grid plate. A second telescopic pump body is provided between the movable grid plate and the drive group. The drive group and the second telescopic pump body are communicatively connected to the two measuring elements.

[0031] In the initial state, the movable grid plate is mounted on the conveying roller and located downstream of the two-track system. When the first-track element sends a non-compliance signal to the second telescopic pump body, the second telescopic pump body drives the movable grid plate to rise. After rising, the drive group drives the movable grid plate to slide upstream of the baking machine. After sliding, the second telescopic pump body descends to its original height.

[0032] The embodiments of the present invention have the following advantages:

[0033] This invention uses a low-temperature drying method of 100-120℃ to produce the printing coating. In this process, the production is more energy-efficient and environmentally friendly, the resulting product has reduced color change, shorter heating time, and reduced carbon emissions.

[0034] This invention provides a testing mechanism on the conveyor belt of the printing and coating process that can detect the viscosity and thickness of the printed coating. This prevents printed coatings with unqualified thickness or viscosity from entering the baking machine for baking, thus simplifying the baking process. After the printed coating is removed from the production line, it facilitates product recycling and improves the qualification rate of the finished product.

[0035] This invention includes a testing mechanism for detecting the hardness of the printed coating between the baking machine and the finished product recycling area. This allows the printed coating that has initially cured but is not hard enough to be returned to the upstream of the baking machine for secondary curing, reducing product scrap rate and making it more environmentally friendly. Attached Figure Description

[0036] To more clearly illustrate the embodiments of the present invention or the technical solutions in 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 merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0037] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0038] Figure 1 This is a schematic diagram of the process in an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of the structure of an embodiment of the present invention;

[0040] Figure 3 This is a schematic diagram of the testing mechanism in an embodiment of the present invention;

[0041] Figure 4 For the present invention Figure 3 A schematic diagram of the structure of the first material dispensing component in the embodiment shown;

[0042] Figure 5 For the present invention Figure 3 The schematic diagram of the rotating component in the embodiment shown is as follows;

[0043] Figure 6 For the present invention Figure 3 A schematic diagram of the structure of the second material dispensing component in the embodiment shown.

[0044] Numbering on the map:

[0045] 1-Mixing tank; 2-Printing and coating main unit; 3-Feeding pipe; 4-Synchronous conveyor; 5-Baking machine; 6-Finished product receiving belt; 7-Testing mechanism; 8-First material distribution assembly; 9-Second material distribution assembly;

[0046] 401 - Fixed frame; 402 - Conveyor roller; 403 - Connecting belt;

[0047] 701 - First measuring element; 702 - Second measuring element;

[0048] 801-Fixed component; 802-Rotating grid plate; 803-Limiting frame; 804-Rotating component; 805-Sliding rod; 806-First telescopic pump body;

[0049] 8041 - Driven gear; 8042 - Gear shaft;

[0050] 901-Rail; 902-Drive group; 903-Moving grid plate; 904-Second telescopic pump body. Detailed Implementation

[0051] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] like Figure 1 As shown, the present invention provides a low-carbon and environmentally friendly printing and coating process, comprising the following steps:

[0053] Step 100: Feed the raw materials into the mixer according to the formula and mix them thoroughly to obtain a slurry.

[0054] Step 200: Apply the mixed paste to the printing plate and test the viscosity and thickness of the printed layer;

[0055] Step 300: Place the tested and qualified printing coating into the baking machine for low-temperature baking;

[0056] Step 400: Perform a hardness test on the baked printing coating and send the qualified printing coating to the finished product area.

[0057] Furthermore, the low-temperature baking temperature is 100-120℃.

[0058] To prevent high temperatures from affecting the product, a low-temperature drying method of 100-120℃ can be used to produce the printing coating. In the process disclosed in this invention, the production is more energy-efficient and environmentally friendly, the resulting product has reduced color change, shorter heating time, and reduced carbon emissions.

[0059] The following is an embodiment, with technical parameters specific to the traditional process:

[0060] Serial Number project standard 1 Color and appearance Transparent and slightly cloudy 2 Viscosity (Ford cup #4) S / 25℃ 90s±10 3 Baking time ℃ / 12min 170-180℃ 4 Fineness ≤5 5 scratch g ＞1500g 6 Impact strength kg / cm 50 No cracks 7 Pencil hardness (Mitsubishi) H 2H 8 T-bend 0T 9 Adhesion level Level 1 10 Solvent-based (MEK) times / round trip >30 times 11 Solid content % 42±2％ 12 luster ＞100 13 Resistance to yellowing (8 hours of exposure to a 30W xenon lamp) Slight yellowing

[0061] The technical parameters for the process of this invention are as follows:

[0062] Serial Number project standard 1 Color and appearance Transparent and slightly cloudy 2 Viscosity (Ford cup #4) S / 25℃ 80s±10 3 Baking time ℃ / 12min 100-120℃ 4 Fineness ≤5 5 scratch g ＞1000g 6 Impact strength kg / cm 50 No cracks 7 Pencil hardness (Mitsubishi) H 2H 8 T-bend 0T 9 Adhesion level Level 1 10 Solvent-based (MEK) times / round trip >30 times 11 Solid content % 54±2％ 12 luster ＞100 13 Resistance to yellowing (8 hours of exposure to a 30W xenon lamp) none

[0063] Based on the foregoing comparison, this invention uses a low-temperature drying method of 100-120℃ to produce the printing coating. In this process, the production is more energy-efficient and environmentally friendly, the resulting product has reduced color change, shorter heating time, and reduced carbon emissions.

[0064] Due to the short heating time and low temperature, subsequent products may exhibit cooling blocks and incomplete curing, leading to an increased product scrap rate. To address this issue, the following device is used to resolve the problem of incomplete curing.

[0065] like Figures 2 to 6 As shown, the present invention also provides a printing and coating device based on a low-carbon and environmentally friendly printing and coating process, including a printing and coating host 2. A mixing and stirring tank 1 is connected to the inlet end of the printing and coating host 2 through a feeding pipe 3. The mixing and stirring tank 1 mixes and stirs the raw materials according to the formula to ensure that the raw materials are fully mixed to obtain a mixed slurry. The printing and coating host 2 prints the mixed slurry onto the workpiece to form a printing layer.

[0066] The printing and coating host 2 is equipped with a synchronous conveyor 4 at the printing and coating outlet end. The synchronous conveyor 4 is a roller conveyor belt that can send the workpiece containing the printing and coating layer into the baking machine 5 for low-temperature baking. The end of the synchronous conveyor 4 is seamlessly connected to the finished product receiving belt 6, which is used to send the baked workpiece containing the printing and coating layer into the finished product area.

[0067] Since the workpiece itself does not require baking, the printed coating can be used to directly refer to the workpiece moving on the synchronous conveyor 4.

[0068] The synchronous conveyor 4 is equipped with a testing mechanism 7 and several material distribution components. The testing mechanism 7 can test the performance of the printing coating to determine whether the printing coating meets the production requirements. The material distribution components can separate unqualified printing coating workpieces from the synchronous conveyor 4 to prevent them from entering the finished product area.

[0069] Specifically, the testing mechanism 7 includes a first measuring element 701 and a second measuring element 702 installed on the synchronous conveyor 4. The first measuring element 701 and the second measuring element 702 are respectively installed upstream and downstream of the baking machine 5. That is, the first measuring element 701 is installed between the printing and coating host 2 and the baking machine 5, and the second measuring element 702 is installed between the baking machine 5 and the finished product receiving belt 6.

[0070] Among them, the measuring element 701 is used to detect the viscosity and thickness of the printed coating to prevent printed coatings with unqualified thickness or viscosity from entering the baking machine 5 for baking. The baked products are simplified. At this time, the printed coating has not yet formed. After the printed coating is removed from the production line, the printed coating can be wiped off to realize the recycling of the product.

[0071] The second measuring element 702 is used to test the hardness of the printed coating.

[0072] The first measuring element 701 and the second measuring element 702 ensure that only printed coatings that pass all tests for viscosity, thickness, and hardness can enter the finished product receiving belt 6. The printed coatings that pass through the first measuring element 701 are not yet cured, making them easy to recycle. The printed coatings that pass through the second measuring element 702 have undergone preliminary curing and can be returned to the upstream of the baking machine 5 for secondary curing, reducing the generation of defective products and enabling recycling, which is more environmentally friendly.

[0073] In this embodiment, the synchronous conveyor 4 can be any type of conveyor, but in order to facilitate material distribution and the movement of workpieces on the conveyor, the synchronous conveyor 4 is preferably a powered conveyor roller conveyor belt. The conveyor belt includes several fixed frames 401 and conveyor rollers 402 that are driven to rotate synchronously by a rotating motor on the fixed frames 401. The conveyor rollers 402 are connected by a connecting belt 403, and a gap is provided between every two adjacent conveyor rollers 402.

[0074] Both the first measuring element 701 and the second measuring element 702 are horizontally arranged on the fixed frame 401, and the first measuring element 701 and the second measuring element 702 are arranged parallel to the conveying roller 402.

[0075] The powder assembly includes a first dispensing assembly 8 and a second dispensing assembly 9. The first dispensing assembly 8 corresponds to the function of a measuring element 701 and is communicatively connected to the measuring element 701. The second dispensing assembly 9 corresponds to the function of a measuring element 702 and is communicatively connected to the measuring element 702.

[0076] Specifically, the first material distribution component 8 is set between the first measuring element 701 and the baking machine 5, and the second material distribution component 9 is set between the second measuring element 702 and the finished product receiving belt 6. Both the first material distribution component 8 and the second material distribution component 9 are installed on the fixed frame 401 through the railing structure, and do not affect the movement of the printing coating on the conveying roller 402.

[0077] The railing structure is the main structure of the first material distribution component 8 and the second material distribution component 9. It is set in correspondence with the conveyor roller 402. It is mainly to facilitate the transfer of the printing coating on the conveyor roller 402, and the transfer process does not affect the operation of the synchronous conveyor 4 itself, nor does it affect the movement of other printing coating workpieces, thus preventing a decrease in production efficiency.

[0078] The first material distribution assembly 8 removes the printed coating that has not passed the detection of a measuring element 701 from the conveying roller 402 by rotation.

[0079] The second material distribution component 9 moves in the reverse direction to bring the printed coating that has not passed the detection of the second measuring element 702 back to the upstream position of the baking machine 5, so as to achieve repeated baking of the printed coating with unqualified hardness.

[0080] The function of the second material distribution component 9 is relatively complex, and the following is an example to illustrate it:

[0081] The second material distribution assembly 9 includes a track 901 installed on the outside of the fixed frame 401 and a movable grid plate 903 that can slide on the track 901 via a drive group 902. The movable grid plate 903 is composed of several rods whose ends are connected together. The rods are spaced apart from the conveying roller 402, and the height of the rods is lower than that of the conveying roller 402. A second telescopic pump body 904 is provided between the movable grid plate 903 and the drive group 902. The drive group 902 and the second telescopic pump body 904 are communicatively connected to the second measuring element 702.

[0082] In the initial state, the movable grid plate 903 is mounted on the conveyor roller 402 and located downstream of the second track 901. When the first element 701 sends a non-conforming signal to the second telescopic pump body 904, the second telescopic pump body 904 drives the movable grid plate 903 to rise. At this time, the movable grid plate 903 can lift the non-conforming printed coating workpiece. After rising, the drive group 902 drives the movable grid plate 903 to slide to the upstream of the baking machine 5. After sliding, the second telescopic pump body 904 descends to the original height, so that the non-conforming workpiece is transferred to the upstream of the baking machine 5 again and located on the synchronous conveyor 4. The workpiece is brought into the baking machine 5 again by the synchronous conveyor 4 for secondary curing, realizing the recycling and replenishment of non-conforming workpieces, improving the yield rate, and reducing the number of non-conforming workpieces.

[0083] It should be noted that during the secondary curing process, because the product's performance has changed, defective workpieces need to be subjected to temperature curing while being conveyed by synchronous conveyor 4. The temperature curing method is as follows:

[0084] First, during the curing process, reverse control is implemented based on temperature changes, so that the product's problems have already reversed back to the initial processing state when the product undergoes secondary curing, making it easier to perform curing processing again.

[0085] Secondly, during the warming process, increase the humidity of the environment in which the product is located to prevent cracking or breakage during drastic temperature changes.

[0086] In summary, the secondary curing of a product is not simply a matter of reprocessing it. Instead, it involves reversing the product back to an uncured state based on specific processing requirements and the product's properties, allowing for further processing. For this product, the key parameters are temperature and humidity. Therefore, this embodiment lists specific temperature and humidity variations. For other products, further parameters are selected based on processing requirements and the product's properties to achieve the purpose of temperature curing.

[0087] After the workpiece is removed from the moving grid plate 903, since there will be a gap between the two workpieces, the moving grid plate 903 will rise again and move back to its original position, then fall back to its original height, waiting for the next instruction from the second measuring element 702.

[0088] The first material distribution component 8 has a simple function: to remove defective products from the production line of the synchronous conveyor 4. However, in order to better achieve this function, the first material distribution component 8 has a relatively complex structure in this embodiment.

[0089] Specifically, the first material distribution component 8 includes a rotating grid plate 802 rotatably mounted on a fixed frame 401 via a fixing member 801. The rotating grid plate 802 is disposed between a measuring element 701 and the baking machine 5. The rotating grid plate 802 is provided with a number of rods whose ends are connected together. The rods are spaced apart from the conveying roller 402, and the height of the rods is lower than that of the conveying roller 402.

[0090] The rotating grid plate 802 can move other qualified workpieces on the conveyor roller 402 without affecting their movement.

[0091] The rotating grid plate 802 can rotate on the fixed frame 401. A limit frame 803 is horizontally arranged on the fixed frame 401. The limit frame 803 is located above the conveying roller 402. The corner of the rotating grid plate 802 passes through the fixed part 801 and is connected to the sliding rod 805 through the rotating part 804. The sliding rod 805 is slidably installed on the limit frame 803 through the first telescopic pump body 806.

[0092] The first telescopic pump body 806 is communicatively connected to a measuring element 701. When the unqualified workpiece detected by the measuring element 701 passes over the rotating grid plate 802, the first telescopic pump body 806 extends and retracts. The rotating grid plate 802 rotates on the conveying roller 402 under the drive of the rotating part 804 at the end of the sliding rod 805, thereby removing the unqualified printed coating workpiece from the conveyor.

[0093] Since the printed coating has not yet cured when removed, it is easy to wash off. The workpiece with the coating removed can be recycled and re-coated. This method is advantageous for printing production lines of workpieces with relatively high intrinsic value.

[0094] When the rotating grid plate 802 rotates, the rotating component 804 drives the rotating grid plate 802 to rotate. The rotating component 804 includes a driven gear 8041 mounted on the rotating grid plate 802, and the end of the sliding rod 805 is provided with a gear shaft 8042 that cooperates with the driven gear 8041.

[0095] When the gear shaft 8042 moves toward the driven gear 8041, the rotating grid plate 802 rotates and moves away from the conveying roller 402, thereby removing the workpiece; when the gear shaft 8042 moves in the opposite direction, the rotating grid plate 802 rotates in the opposite direction and returns to below the conveying roller 402, and the rotating grid plate 802 returns to its initial position.

[0096] Because the coating thickness can vary depending on whether it is sufficient or insufficient, the rotation of the rotating grid plate 802 will also differ. The driven gear 8041 is located at the four corners of the rotating grid plate 802, and the gear shaft 8042 is located at both ends of the sliding rod 805.

[0097] When the sliding rod 805 slides to the top, the rotating grid plate 802 rotates around the axis of the driven gear 8041 in the sliding direction, so that the rotating grid plate 802 can perform two rotation actions, allowing workpieces in different states to be recycled separately.

[0098] The present invention has been described in detail above with general descriptions and specific embodiments. However, modifications or improvements can be made to the present invention, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A low-carbon and environmentally friendly printing and coating process, characterized in that, Includes the following steps: Step 100: Feed the raw materials into the mixer according to the formula and mix them thoroughly to obtain a slurry. Step 200: Apply the mixed paste to the printing plate and test the viscosity and thickness of the printed layer; Step 300: Place the tested and qualified printing coating into the baking machine for low-temperature baking; Step 400: Perform a hardness test on the baked printing coating and send the qualified printing coating to the finished product area.

2. The low-carbon and environmentally friendly printing and coating process according to claim 1, characterized in that, The low-temperature baking temperature is 100-120℃.

3. A printing and coating apparatus based on the low-carbon and environmentally friendly printing and coating process according to any one of claims 1-2, characterized in that, It includes a printing and coating host (2), and a mixing tank (1) is connected to the inlet end of the printing and coating host (2) via a feed pipe (3); The printing and coating host (2) is provided with a synchronous conveyor (4) at the printing and coating outlet end. A baking machine (5) is provided on the synchronous conveyor (4). The synchronous conveyor (4) sends the printing and coating layer into the baking machine (5) for low-temperature baking. The end of the synchronous conveyor (4) is seamlessly connected to a finished product receiving belt (6). The finished product receiving belt (6) is used to send the baked printing and coating layer into the finished product area. A testing mechanism (7) is provided on the synchronous conveyor (4).

4. The printing and coating apparatus according to claim 3, characterized in that, The testing mechanism (7) includes a first measuring element (701) and a second measuring element (702) installed on the synchronous conveyor (4). The first measuring element (701) is installed between the printing and coating host (2) and the baking machine (5), and the second measuring element (702) is installed between the baking machine (5) and the finished product receiving belt (6). The first measuring element (701) is used to detect the viscosity and thickness of the printed coating, and the second measuring element (702) is used to detect the hardness of the printed coating. Only printed coatings that pass all tests for viscosity, thickness and hardness can enter the finished product receiving belt (6).

5. The printing and coating apparatus according to claim 4, characterized in that, The synchronous conveyor (4) is a power conveyor roller type conveyor belt. The conveyor belt includes several fixed frames (401) and conveyor rollers (402) that are driven to rotate synchronously by a rotating motor on the fixed frames (401). The conveyor rollers (402) are connected by a connecting belt (403). A gap is provided between every two adjacent conveyor rollers (402). Both the first measuring element (701) and the second measuring element (702) are arranged laterally on the fixed frame (401), and the first measuring element (701) and the second measuring element (702) are arranged parallel to the conveying roller (402).

6. The printing and coating apparatus according to claim 5, characterized in that, A first material distribution assembly (8) is provided between the first measuring element (701) and the baking machine (5), and a second material distribution assembly (9) is provided between the second measuring element (702) and the finished product receiving belt (6). The first material distribution assembly (8) and the second material distribution assembly (9) are both installed on the fixed frame (401) through a railing structure, and do not affect the movement of the printing coating on the conveying roller (402). The first material distribution assembly (8) removes the printed coating that has not been detected by the measuring element (701) from the conveying roller (402) by rotation; The second material distribution component (9) moves in the reverse direction to trace the printed coating that has not passed the detection of the two measuring elements (702) back to the upstream position of the baking machine (5), thereby realizing repeated baking of the printed coating with unqualified hardness.

7. The printing and coating apparatus according to claim 6, characterized in that, The first material distribution assembly (8) includes a rotating grid plate (802) rotatably mounted on the fixed frame (401) via a fixing member (801). The rotating grid plate (802) is disposed between the first measuring element (701) and the baking machine (5). The rotating grid plate (802) is composed of a plurality of rods whose ends are connected together. The rods are spaced apart from the conveying roller (402), and the height of the rods is lower than that of the conveying roller (402). A limiting frame (803) is horizontally arranged on the fixed frame (401). The limiting frame (803) is arranged above the conveying roller (402). The corner connection of the rotating grid plate (802) passes through the fixed member (801) and is connected to a sliding rod (805) through the rotating member (804). The sliding rod (805) is slidably installed on the limiting frame (803) through the first telescopic pump body (806). The first telescopic pump body (806) is communicatively connected to the measuring element (701). When the first telescopic pump body (806) extends or retracts, the rotating grid plate (802) rotates on the conveying roller (402) under the drive of the rotating part (804) at the end of the sliding rod (805), thereby removing the unqualified printing coating.

8. The printing and coating apparatus according to claim 7, characterized in that, The rotating component (804) includes a driven gear (8041) mounted on the rotating grid plate (802), and the end of the sliding rod (805) is provided with a gear shaft (8042) that cooperates with the driven gear (8041); When the gear shaft (8042) moves toward the driven gear (8041), the rotating grid plate (802) rotates and moves away from the conveying roller (402); when the gear shaft (8042) moves in the opposite direction, the rotating grid plate (802) rotates in the opposite direction and returns to below the conveying roller (402).

9. The printing and coating apparatus according to claim 8, characterized in that, The driven gear (8041) is located at the four corners of the rotating grid plate (802), and the gear shaft (8042) is located at both ends of the sliding rod (805). When the sliding rod (805) slides to the top, the rotating grid plate (802) rotates about the axis of the driven gear (8041) in front of it in the sliding direction.

10. The printing and coating apparatus according to claim 7, characterized in that, The second material distribution assembly (9) includes a track (901) installed on the outside of the fixed frame (401) and a movable grid plate (903) that can slide on the track (901) via a drive group (902). The movable grid plate (903) has the same shape as the rotating grid plate (802). A second telescopic pump body (904) is provided between the movable grid plate (903) and the drive group (902). The drive group (902) and the second telescopic pump body (904) are communicatively connected to the two measuring elements (702). In the initial state, the movable grid plate (903) is mounted on the conveying roller (402) and located downstream of the two-sided track (901). When the first-sided element (701) sends a non-compliance signal to the second telescopic pump body (904), the second telescopic pump body (904) drives the movable grid plate (903) to rise. After rising, the drive group (902) drives the movable grid plate (903) to slide upstream of the baking machine (5). After sliding, the second telescopic pump body (904) descends to its original height.

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