A water transfer printing film pasting device for a complex curved surface TENG device and a film pasting method thereof

Abstract

The present invention belongs to the technical field of water transfer printing (WTP), specifically referring to the preparation of triboelectric nanogenerators (TENG) with various curved surfaces by transferring films onto objects of various shapes through the water transfer printing method. The water transfer printing device includes a transfer pool body: a water tank body is provided at the top of the transfer pool body; a pair of sliding blocks are provided on the top of the water tank body; a collection box is rotatably connected in the middle of the pair of sliding blocks; a collection groove is opened on the side wall of the collection box. After the processing of a workpiece is completed, the staff moves the collection box so that the collection box moves from one end of the water tank body to the other end. During this period, the residual ink will be collected inside the collection groove, thus completing the collection of the residual ink, thereby reducing the residual ink and reducing the impact of the residual ink on the workpiece. The method for preparing TENG devices by water transfer printing includes cleaning the curved substrate and spraying an electrode on its surface, then leading out a wire from the electrode, and spraying a primer after it dries. Subsequently, using the water transfer printing device to transfer the ink pattern layer onto the curved substrate with an electrode can prepare TENG devices with complex curved surfaces.

Description

Technical Field

[0001] The present invention belongs to the technical field of water transfer printing, and specifically relates to a method for transferring a film to prepare various curved TENG devices on objects of various shapes through a water transfer printing device and its method. Background Technique

[0002] The water transfer printing technology is mainly a technology for printing ink patterns on the surfaces of objects of various shapes and materials. It utilizes the surface tension of water and the action of an activator to transfer the patterns printed on a water-soluble PVA film from water to the object surface.

[0003] Workers need to lay the water-soluble film printed with patterns flat in the water tank body of the device. After the water-soluble film dissolves, an activator is evenly sprayed, so that the ink pattern on the film is converted into an ink state. Then, the workpiece to be processed is slowly lowered. Under the action of water pressure, the pattern will adhere to the surface of the workpiece. After taking out the workpiece, it is rinsed with a small water flow to remove the excess activator and residues, and the processing of the workpiece can be completed. However, after the processing of one workpiece is completed, the surface of the water will remain the ink remaining from the previous processing. When the next processing is carried out, it will affect the transfer of the next workpiece, and then cause the pattern to be disordered when the product is transferred.

[0004] In addition, TENG currently faces the problem of difficulty in laminating films on various curved surfaces. Inspired by the water transfer printing technology, the water transfer printing technology can be applied to the lamination of TENG with complex shapes. The water transfer printing technology has diverse pattern selections, is suitable for complex shapes and curved surfaces, has durability and wear resistance, is simple to operate and has a low cost. This can not only decorate the TENG device, but also solve the problem of film lamination of curved surface TENG, and the preparation process is simple. Therefore, in view of the above problems, a water transfer printing film laminating device and its laminating method for a complex curved surface TENG device are proposed. Summary of the Invention

[0005] In order to make up for the deficiencies of the prior art and solve at least one technical problem proposed in the background technique, the present invention proposes a water transfer printing film laminating device and its laminating method for a complex curved surface TENG device.

[0006] The technical solution adopted by the present invention to solve its technical problems is: A water transfer printing film laminating device for a curved surface TENG device of the present invention includes a transfer pool body: a water tank body is provided at the top of the transfer pool body; a pair of sliding blocks are provided at the top of the water tank body; a collection box is rotatably connected in the middle of the pair of sliding blocks; a collection groove is opened on the side wall of the collection box.

[0007] Preferably, a pair of chutes are opened at the top of the transfer pool body; the chutes are symmetrically arranged; a pair of grooves are opened at the ends of the sliding blocks; a ball is rotatably connected to the inner side wall of the groove; the ball is in contact with the chute.

[0008] Preferably, a lever is provided on the top of the collection box; the lever is fixedly connected to the top of the transfer pool body; a rubber plate is fixedly connected to the end of the collection box.

[0009] Preferably, a method for water transfer printing of a curved surface TENG device includes the following steps:

[0010] S1: Prepare the substrate for fabricating the TENG, ensure its surface is clean, smooth, and free of impurities such as grease and dust. Before transfer printing, attach or spray an electrode layer on the substrate, then lead out a wire from the electrode. After drying, spray a primer on the substrate with the electrode layer, and dry the primer by baking or natural drying until it is 80% dry.

[0011] S2: Prepare a water transfer printing film with printed patterns, a water tank, a spray gun, and an activator.

[0012] S3: Keep the water temperature in the water tank at about 30°C. Deposit the water transfer printing film on the water surface. Wait until the film is completely in contact with the water and becomes soft, then evenly spray the activator composed of organic solvents on the film to completely dissolve the film paper into an ink state.

[0013] S4: Immerse the pre-prepared substrate into the water transfer printing tank. The floating pattern ink is transferred to the object surface under the action of water pressure. Use the above water transfer printing method to transfer the ink layer as the friction layer of the TENG.

[0014] S5: Rinse the object with water and dry it to enhance the adhesion of the pattern, thereby completing the preparation of the curved surface TENG device.

[0015] Preferably, in S1, put the prepared substrate for the TENG into a cleaning device to clean the substrate to ensure its surface is clean and smooth, then air-dry it and spray the electrode layer. Lead out a wire from the electrode and then air-dry or bake it, and then spray a primer on the surface of the substrate and dry the primer by baking or natural drying until it is 80% dry.

[0016] Preferably, in S3, a temperature detection device needs to be placed in the water tank to keep the water temperature between 28°C and 33°C and control the temperature within this range. Deposit the water transfer printing film on the water surface. Wait until the film is completely in contact with the water and becomes soft, then evenly spray the activator composed of organic solvents on the film to completely dissolve the film paper into an ink state.

[0017] Preferably, in S4, immerse the prepared substrate into the water transfer printing tank at a 45° angle to the ink pattern. The floating ink pattern is transferred to the object surface under the action of water pressure.

[0018] Preferably, S5 takes out the substrate with the ink layer from the transfer tank, then rinses it with a small water flow, and dries it, so that the ink adheres to the surface of the substrate, thereby transferring an ink layer onto the curved substrate sprayed with electrodes, and thus preparing a TENG device with a complex shape.

[0019] Advantages of the present invention:

[0020] The present invention provides a water transfer film laminating device and a film laminating method for a TENG device with a complex curved surface. By providing a collection box, after completing the processing of one workpiece, the operator moves the collection box so that the collection box moves from one end of the water tank body to the other end. During this period, the residual ink will be collected inside the collection tank, thus completing the collection of the residual ink, thereby reducing the residual ink, reducing the influence of the residual ink on the workpiece, improving the transfer effect of the setting, reducing the mistakes during the processing of the workpiece, and improving the qualified rate of the product.

[0021] By providing the ball bearings, the sliding connection between the sliding block and the transfer pool body is changed to the rotational connection between the ball bearings and the sliding groove, thereby reducing the friction force when the sliding block moves, and thus increasing the smoothness when the sliding block moves. By providing the sliding groove, the position of the ball bearings is effectively limited to a certain extent, and thus the stability when the sliding block moves is increased.

[0022] By spraying an electrode layer on an object with a complex curved surface and then using the above water transfer method to transfer an ink layer as the friction layer of the TENG, various shaped TENG devices can be prepared. This method can solve the film laminating problem of TENG with complex shapes and can batch produce TENG, with low cost and easy operation. Description of the Drawings

[0023] The drawings described herein are used to provide a further understanding of the present invention, form a part of this application, and the illustrative embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0024] Figure 1 is the flow chart of the water transfer film laminating method of the present invention;

[0025] Figure 2 is the three-dimensional view of the transfer device of the present invention;

[0026] Figure 3 is the cooperation diagram of the sliding block and the collection box in the present invention;

[0027] Figure 4 is the cooperation diagram of the ball bearing and the sliding block in the present invention;

[0028] Figure 5 is the three-dimensional view of the connecting rod in the present invention;

[0029] Figure 6 is the brief water transfer printing flow chart in the present invention;

[0030] Figure 7 is the finished product display diagram of water transfer printing on various shapes in the present invention;

[0031] Figure 8 is the display diagram of the thickness of Cu and the thickness of the Cu / ink layer during WTP on Cu in the present invention;

[0032] Figure 9 is the comparison diagram of the electrical output of the TENG composed of the ink friction part prepared by WTP and different materials in the present invention;

[0033] Figure 10 is the triboelectric properties of the ink layer prepared by Cu / WTP & FEP / Cu TENG in the present invention. (a) Current output at different frequencies, (b) Matching impedance, (c) Charging capacitance curve diagram;

[0034] Figure 11 is the schematic diagram of the cycle stability of the ink layer prepared by Cu / WTP & FEP / Cu TENG in the present invention;

[0035] Legend:

[0036] 1. Transfer pool body; 11. Water tank body; 12. Sliding block; 13. Collection box; 14. Collection groove; 2. Slide groove; 21. Groove; 22. Ball; 3. Lever; 31. Rubber plate; 4. Connecting rod. Detailed implementation manners

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than 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 making creative efforts belong to the scope of protection of the present invention.

[0038] Specific embodiments are given below.

[0039] Please refer to Figure 1 - Figure 4The present invention provides a curved surface TENG device water transfer printing film device, comprising a transfer pool body 1: a water tank body 11 is provided on the top of the transfer pool body 1; a pair of sliding blocks 12 are provided on the top of the water tank body 11; a collecting box 13 is rotatably connected to the middle of the pair of sliding blocks 12; a collecting tank 14 is opened and closed on the side wall of the collecting box 13. During operation, the staff needs to lay the water-soluble film printed with the pattern flatly in the water tank body 11, and then evenly spray the activator on it, so that the ink pattern on the film is converted into an ink state. Then the workpiece to be processed is slowly lowered down. Under the action of water pressure, the pattern will adhere to the surface of the workpiece. When the workpiece is taken out, the processing of the workpiece is completed. This process is repeated. After completing the processing of a workpiece, the surface of the water will retain the residual ink from the previous processing. When the next processing is carried out, it will affect the transfer of the next workpiece. Through the set collection box 13, after completing the processing of a workpiece, the staff moves the collection box 13 from one end of the water tank body 11 to the other end. During this period, the residual ink will be collected inside the collection tank 14 to complete the collection of the residual ink, thereby reducing the residual ink, thereby reducing the impact of the residual ink on the workpiece, improving the transfer effect of the setting, reducing errors in the processing of the workpiece, and improving the qualified rate of the product.

[0040] Further, such as Figure 2 - Figure 4 As shown, a pair of slide grooves 2 are provided on the top of the transfer pool body 1; the slide grooves 2 are symmetrically arranged; a pair of grooves 21 are provided on the end of the sliding block 12; the inner side wall of the groove 21 is rotatably connected to the ball 22; the ball 22 is in contact with the slide groove 2. During operation, when the collection box 13 is moved, the sliding block 12 will also move on the top of the transfer pool body 1. Through the set ball 22, the sliding connection between the sliding block 12 and the transfer pool body 1 is changed to a rotational connection between the ball 22 and the slide groove 2, thereby reducing the friction of the sliding block 12 when moving, thereby increasing the smoothness of the sliding block 12 when moving, and through the set slide groove 2, the position of the ball 22 is effectively limited to a certain extent, thereby increasing the stability of the sliding block 12 when moving.

[0041] Further, such as Figure 2 - Figure 4 As shown, a lever 3 is provided on the top of the collection box 13; the lever 3 is fixedly connected to the top of the transfer pool body 1; a rubber plate 31 is fixedly connected to the end of the collection box 13. During operation, through the provided lever 3, when the collection box 13 is moved to the end of the transfer pool body 1, the worker can use his thumb to push the lever 3 to rotate the collection box 13 to a certain angle. During rotation, the rubber plate 31 will contact the inner wall of the water tank body 11, thereby collecting the residual ink on the inner wall of the water tank body 11 in the collection tank 14, thereby increasing the cleaning effect of the equipment.

[0042] Furthermore, as Figure 1 shown, a water transfer film method for a curved surface TENG device, the method comprising the following steps:

[0043] S1: Prepare the substrate for fabricating the TENG, ensure its surface is clean, smooth, and free of impurities such as grease and dust. Before transfer, attach or spray an electrode layer on the substrate, then lead out a wire from the electrode. After drying, spray a primer on the substrate with the electrode layer, and dry the primer by baking or natural drying until it is 80% dry;

[0044] S2: Prepare a water transfer film with a printed pattern, a water tank, a spray gun, and an activator;

[0045] S3: Keep the water temperature in the water tank at about 30 °C. Deposit the water transfer film on the water surface. Wait until the film is completely in contact with the water and becomes soft, then evenly spray the activator composed of organic solvents on the film to completely dissolve the film paper into an ink state;

[0046] S4: Immerse the pre-prepared substrate into the water transfer tank, and the floating pattern ink is transferred to the object surface under water pressure. Use the above water transfer method to transfer the ink layer as the friction layer of the TENG;

[0047] S5: Rinse the object with water and dry it to enhance the adhesion of the pattern, thus completing the preparation of the curved surface TENG device. During operation, this method effectively improves the transfer effect of the device.

[0048] Furthermore, as Figure 1 shown, in S1, put the prepared substrate of the TENG into a cleaning device to clean the substrate, ensure its surface is clean and smooth, then air-dry it and spray the electrode layer. Lead out a wire from the electrode and then air-dry or bake it. Then spray a primer on the surface of the substrate and dry the primer by baking or natural drying until it is 80% dry. By cleaning the substrate, the dust on the substrate surface is effectively reduced, thereby improving the adhesion effect of the pattern and the quality of the product.

[0049] Furthermore, as Figure 1As shown, in S3, the temperature detection device needs to be placed in the water tank so that the water temperature is between 28°C and 33°C, and the temperature is controlled within this range. The water transfer film is deposited on the water surface. After waiting for the film to fully contact the water and become soft, the activator composed of organic solvents can be evenly sprayed on the film to completely dissolve the film paper into an ink state. During operation, the temperature detection device is placed in the water tank so that the water temperature is between 28°C and 33°C, and the temperature is controlled within this range. The water transfer film is deposited on the water surface. After waiting for the film to fully contact the water and become soft, the activator composed of organic solvents can be evenly sprayed on the film to completely dissolve the film paper into an ink state. By controlling the water temperature, the adhesion effect between the ink and the substrate is effectively increased, the influence of temperature during processing is reduced, and the qualified rate of the product is increased.

[0050] Further, as Figure 1 shown, in S4, the patterned water-soluble PVA film is flatly placed into the transfer tank, and then the substrate is aligned with the pattern on the surface of the transfer tank and immersed in the water transfer tank. The floating ink pattern is transferred to the object surface under the action of water pressure.

[0051] Furthermore, as Figure 1 shown, in S5, the substrate is taken out of the transfer tank, then the substrate is washed with water and dried to make the pattern adhere to the surface of the substrate, enhancing the adhesion of the pattern, thereby completing the preparation of the curved surface TENG device.

[0052] Furthermore, as Figure 5 shown, a connecting rod 4 is fixedly connected to the top of the sliding block 12. During operation, by setting the 4, when the sliding block 12 is moved, the two ends of the sliding block 12 can be simultaneously stressed, thereby increasing the stability of the movement of the device.

[0053] Working principle: The triboelectric nanogenerator (TENG) is one of the most promising energy strategies. Its basic theory stems from the Maxwell displacement current, which is caused by the time variation of the electric field plus the dielectric polarization term. In addition, the working principle of TENG is based on coupled contact electrification and electrostatic induction, that is, triboelectric charges can be generated on the surfaces of two materials with different polarities in contact, and a potential difference is further formed when the two materials are separated by an external mechanical force. The potential difference can drive free electrons to flow between two electrodes on the surfaces of the two materials established by an external load. In principle, all materials in nature have triboelectric charging effects, so any materials with different charge affinities can be used to construct TENG. However, there are always some problems in the preparation of various TENG devices, such as the unevenness of the TENG film, the appearance of bubbles, or the difficulty in fabricating 3D complex shapes suitable for practical applications and realizing batch film pasting. To solve these problems from the manufacturing perspective, the present invention proposes a new manufacturing method based on water transfer printing. Water transfer printing allows the transfer of two-dimensional planar designs onto three-dimensional surfaces of any shape, can be transferred on various substrates, is inexpensive, and does not require special equipment. Secondly, water transfer printing can perform batch printing, saving time and effort. Finally, water transfer printing can achieve the transfer of various patterns and designs, providing rich decoration and personalized choices for electronic devices. Therefore, through the method of water transfer printing, a perfect TENG film pasting process can be carried out on the surface of any object. The staff needs to first clean the object substrate to be prepared into a TENG device, then dry it and spray the electrode layer, and then dry it. After that, spray the primer on the substrate surface and dry the primer by baking or natural drying until it is about 80% dry.By cleaning the substrate to ensure that there is no dust on the surface, the adhesion effect of the pattern is improved and the quality of the product is improved. The water-soluble film with the printed pattern is evenly laid in the water tank body 11, and then the activator is evenly sprayed on it to convert the ink pattern on the film into an ink state. Then the workpiece to be processed is slowly lowered. Under the action of water pressure, the pattern will adhere to the surface of the workpiece. The workpiece is then taken out and dried to prepare the TENG device. The ink remaining from the previous processing will remain on the surface of the water, which will affect the transfer of the next workpiece during the next processing. Through the set collection box 13, after completing the processing of a workpiece, the worker moves the collection box 13 from one end of the water tank body 11 to the other end. During this period, the residual ink will be collected inside the collection tank 14 to complete the collection of the residual ink, thereby reducing the residual ink, thereby reducing the impact of the residual ink on the workpiece, improving the set transfer effect, reducing errors in the processing of the workpiece, and improving the qualified rate of the product. When moving the collection box 13, the sliding block 12 will also move on the top of the transfer pool body 1. Through the set ball 22, the sliding connection between the sliding block 12 and the transfer pool body 1 is changed to a rotating connection between the ball 22 and the slide groove 2, thereby reducing the sliding The friction of the block 12 during movement increases the smoothness of the movement of the sliding block 12. The provided slide groove 2 effectively limits the position of the ball 22, thereby increasing the stability of the sliding block 12 during movement. The provided lever 3 allows the worker to use his thumb to move the lever 3 when moving the collection box 13 to the end of the transfer pool body 1, causing the collection box 13 to rotate a certain angle. During rotation, the rubber plate 31 contacts the inner wall of the water tank body 11, thereby collecting the residual ink on the inner wall of the water tank body 11 in the collection tank 14, thereby improving the cleaning effect of the equipment. This method effectively improves the transfer effect of the equipment. The water temperature is maintained at around 30°C during the water transfer process. The provision of 4 allows the sliding blocks 12 at both ends to be subjected to force simultaneously when moving, thereby increasing the stability of the movement of the equipment. The friction part of the ink prepared by water transfer is assembled with various materials to test the triboelectric performance of TENG. The film thickness of each material is 80 μm, and Cu is used as the electrode. Figure 9 As shown in Figure 2, the triboelectric performance of the ink friction layer prepared by Cu / WTP and FEP / Cu TENG is the best, with voltage, current and charge being 441 V, 7.8 μA and 0.4 μC respectively. The triboelectric performance of the ink layer prepared by Cu / WTP and FEP / Cu TENG is tested separately. Figure 10As shown, when the test frequencies are 2 Hz, 3 Hz, and 4 Hz, their current output values are equivalent and greater than those at other frequencies. The 2 Hz frequency is used for testing in all tests. (b) is the matching impedance diagram of current and power. The power is calculated according to the formula P = I2·R. When the matching impedance is 70 MΩ, the power is 1.729 mW. Figure (c) shows the charging of capacitors with capacitances of 10, 33, 47, and 100 μF respectively, indicating that the TENG has good charging ability.

[0054] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and all these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A method for water transfer printing film of a complex curved surface TENG device, characterized in that: The method comprises the following steps: S1: Prepare the substrate for fabricating the TENG, ensuring its surface is clean, smooth, and free of impurities such as grease and dust. Before transfer printing, attach or spray an electrode layer on the substrate, then lead out a wire from the electrode. After drying, spray a primer on the substrate with the electrode layer, and dry the primer by baking or natural drying until it is about 80% dry; S2: Prepare the water transfer printing film with printed patterns, a water tank, a spray gun, and an activator; S3: Keep the water temperature in the water tank at about 30°C. Deposit the water transfer printing film on the water surface. Wait until the film is completely in contact with the water and becomes soft, then evenly spray the activator composed of organic solvents on the film to completely dissolve the film paper into an ink state; S4: Immerse the pre-prepared substrate into the water transfer printing tank. The floating pattern ink is transferred to the object surface under the action of water pressure. Use the above water transfer printing method to transfer the ink layer as the friction layer of the TENG; S5: Rinse the object with water and dry it to enhance the adhesion of the pattern, thereby completing the preparation of the curved surface TENG device.

2. A water transfer printing film method for a complex curved surface TENG device according to claim 1, characterized in that: In S1, put the prepared substrate of the TENG into a cleaning device to clean the substrate, ensure its surface is clean and smooth, lead out a wire from the electrode, and then dry it by air drying or baking. Then spray a primer on the substrate surface and dry the primer by baking or natural drying until it is 80% dry.

3. A method for water transfer printing film of a complex curved surface TENG device according to claim 2, characterized in that: In S3, a temperature detection device needs to be placed in the water tank to keep the water temperature between 28°C and 33°C and control the temperature within this range. Deposit the water transfer printing film on the water surface. Wait until the film is completely in contact with the water and becomes soft, then evenly spray the activator composed of organic solvents on the film to completely dissolve the film paper into an ink state.

4. A water transfer printing film method for a complex curved surface TENG device according to claim 3, characterized in that: In S4, immerse the prepared substrate into the water transfer printing tank at a 45° angle to the ink pattern. The floating ink pattern is transferred to the object surface under the action of water pressure.

5. A method for water transfer printing film of a complex curved surface TENG device according to claim 4, characterized in that: In S5, take out the substrate with the ink layer from the transfer printing tank, then rinse it with a small water flow and dry it to make the ink adhere to the substrate surface, thereby transferring an ink layer on the curved surface substrate with electrodes sprayed, and thus preparing a TENG device with a complex shape.

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