CN117207671B - A shape control device and application for pneumatic direct writing printing needles - Google Patents

Abstract

The invention belongs to the technical field of direct-writing printing, and particularly relates to a morphology control device for a pneumatic direct-writing printing needle head and application thereof; the line height difference of the printed product obtained by printing by using the morphology control device is small, and the prepared printed product has higher precision and better quality; in addition, the appearance control device provided by the invention has the advantages of simple structure, lower preparation cost, convenience in installation, capability of being detachably connected with the direct-writing printing needle head and higher application flexibility.

Description

A shape control device and application for pneumatic direct writing printing needles

Technical field

The invention belongs to the technical field of direct writing printing, and specifically relates to a shape control device and application for a pneumatic direct writing printing needle.

Background technique

Direct Ink Writing (DIW) is an emerging high-precision additive 3D printing technology that uses a controllable nozzle system to accurately spray viscous ink onto the target surface, and then cures or cross-links it through heat and other methods to solidify the ink and form a three-dimensional structure. Based on its own advantages, ink direct writing printing has shown great application potential in the fields of biomedical engineering, micro device manufacturing, aerospace and defense, and the display industry in recent years. Specifically, ink direct writing printing has the following advantages: ink direct writing printing has high precision and high resolution, and can realize the construction of complex geometric shapes, microstructures and tiny sizes. It is widely used to manufacture complex structures and nanoscale structures. materials, the quality of the materials produced is better; ink direct-write printing technology can achieve high-speed printing, meeting the application needs of the current printing market; compared with traditional inkjet and laser printing technologies, ink direct-write printing technology can be more economical Ink is used efficiently, so the cost of using the equipment is lower; ink direct writing printing can be used to print different types of inks, including color inks, fluorescent inks, metallic inks, etc., so the range of printing applications is extremely wide; application flexibility is high, By using different types of inks and printing substrates, the performance characteristics of the final product of ink direct writing printing can be adjusted, such as hardness, elasticity, conductivity, etc.; in addition, compared with existing printing technologies, ink direct writing printing can It is very quiet during operation and does not produce noise interference.

The ink discharging methods in direct ink printing mainly include pneumatic, mechanical and electromagnetic. The so-called pneumatic ink discharging refers to extruding ink into a nozzle or syringe by applying air pressure, and then controlling the extrusion speed and fluidity of the ink by controlling the size of the air pressure and the position of the nozzle. The so-called mechanical ink discharging uses a mechanical device to control the extrusion and flow of ink. A common mechanical ink discharging device is a screw extrusion structure. Electromagnetic ink discharging uses electromagnetic force to push ink into a nozzle or syringe. This method usually uses electromagnetic drive or solenoid valve to control the extrusion speed and fluidity of ink. Based on comprehensive considerations of wear and energy consumption of mechanical ink discharging and electromagnetic ink discharging, the discharging method used by the common and widely used ink direct-write printing devices on the market is pneumatic. Pneumatic ink discharging has the following advantages: the pneumatic discharging method can control the ink flow speed and extrusion amount by adjusting the air pressure, so the accuracy during the printing process is higher; the pneumatic discharging method has higher Adjustable, the ink discharging speed and flow rate can be adjusted as needed to achieve instant start and stop of ink discharging to meet the best printing results under different printing requirements.

Although pneumatic direct-writing printing has many of the above advantages, during the printing process, due to the pneumatic direct-writing printing, the printing needle gradually accelerates to a constant speed during the initial stage of printing (the printing needle gradually accelerates to a constant speed) and the end stage (the printing needle gradually decelerates from a constant speed). When reaching the acceleration and deceleration positions such as the stage of stopping printing), the printing needle moves at a speed smaller than the printing speed in the constant speed printing stage. Therefore, when the air pressure remains consistent, excess ink will accumulate on the surface of the printing substrate at the acceleration and deceleration positions. , forming a longer process edge. In order to minimize the process edge length, improve substrate utilization, reduce the frame width of the final printed product, and reduce printing costs, a common solution in practice is the rapid gas switching method, that is, lagging the ink at the starting position close to the acceleration section Apply air pressure and stop the ink in advance near the end of the deceleration section to ensure that the ink flow rate matches the moving speed of the printing needle. However, on the one hand, there is a hysteresis effect in the pneumatic system. When printing at high speed, the direct-write printing equipment cannot ensure an accurate match between the ink flow and the moving speed. Therefore, this method cannot well solve the technical problem of product process side length; on the other hand, Frequent switching of air pressure will cause the actual feed pressure to fail to reach a steady state, so the line height difference of the printed products obtained will be large and inaccurate.

Contents of the invention

The purpose of the present invention is to provide a topography control device and application for pneumatic direct writing printing needles with high printing accuracy, which is specifically achieved through the following technical solutions:

A topography control device for a pneumatic direct writing printing needle. The topography control device includes a first surface and a second surface arranged correspondingly, and a thread for installing the direct writing needle that runs through the first surface and the second surface. Write the mounting hole of the printing needle; one end of the mounting hole and the first surface form a first placement opening, and the other end of the mounting hole and the second surface form a second placement opening; the topography control device also includes a material control component, The material control component includes a material suction slit penetrating the second surface, and a material suction component connected throughly with an end of the material suction slit close to the first surface; the side of the material suction slit close to the second surface forms a useful The diameter of the second placement port is larger than the diameter of the liquid outlet of the direct writing printing needle for guiding the ink on the surface of the liquid outlet of the direct writing printing needle to flow along the suction slit.

By providing a brand new topography control device that can be installed on the direct writing printing needle, the invention greatly reduces the length of the process edge, avoids excessive waste of ink, and lowers the printing cost; and using this device The line height difference of the printed products obtained by printing with the topography control device of the invention is smaller, and the printed products produced have higher precision and better quality; in addition, the topography control device of the invention has a simple structure and low preparation cost. It is easy to install and can be detachably connected to the direct-write printing needle, making it highly flexible. specific:

In this technical solution, the topography control device of the present invention is configured by providing a first surface, a second surface, a mounting hole penetrating the first surface and the second surface, and a first mounting opening and a third mounting hole matching the mounting hole. The second installation port will facilitate the installation of direct writing printing needles. During the installation process, you only need to pass the liquid outlet of the direct writing printing needle through the first installation port and the second installation port in sequence, and place it inside the installation hole.

The shape control device of the present invention provides a liquid guide port on the second surface, a suction material slit and a material suction component that are sequentially connected to the liquid guide port, and defines a second placement port and a direct writing printing needle liquid outlet. The relationship between the diameter and diameter can effectively solve the problem of too long process edges of printed products in the existing technology. Take the direct writing printing needle in the deceleration stage as an example. Since the pressure exerted on the ink remains consistent, when the direct writing printing needle is in the deceleration stage, the ink on the surface of the direct writing printing needle outlet will continue to accumulate until it contacts the liquid guide port. , and then the suction part will suck out the ink along the liquid guide port and suction slit in sequence. At this time, there will be no more ink remaining on the surface of the direct writing needle, so the process edge will be shortened, and the ink absorbed by the suction part will Can also be reused. It should be pointed out that by adjusting the diameter relationship between the second placement port and the direct writing printing needle outlet, the present invention can realize that only when the ink on the surface of the direct writing printing needle outlet accumulates to a certain amount, the suction will be triggered. The material component absorbs the ink, which effectively prevents the material component from indiscriminately absorbing the ink on the surface of the direct writing needle outlet. Therefore, the quality of the uniform-speed printing products is also guaranteed.

Preferably, the suction slit is coaxially arranged with the second placement opening.

In principle, any suction slit that can achieve a through-connection between the liquid guide port and the suction component can meet the ink suction requirements of the suction component. Therefore, the shape of the suction slits of the present invention can be distributed in the second position. One or more holes near the opening may also be arc-shaped suction slits distributed near the second placement opening. In this technical solution, the suction slit is an annular suction slit that surrounds the second placement opening and is coaxially arranged therewith. By setting up the technical solution of annular suction slits, on the one hand, it provides a larger accommodation space for ink suction, so it can be applied to direct writing printing needles with large ink storage capacity; on the other hand, it can also increase the The liquid guide port is in contact with the ink. Therefore, as the ink in the liquid outlet of the direct-writing printing needle located in the center continues to accumulate, the ink will come into contact with the liquid guide ports evenly distributed around it. At this time, the ink of the suction part is absorbed The effect is better. There is less ink residue on the surface of the direct writing printing needle outlet, which can further shorten the length of the process edge.

Preferably, the inner surface of the mounting hole is provided with a temperature control component for controlling the surface temperature of the direct writing printing needle.

The applicant found through research that the uniformity of the surface temperature of the direct writing printing needle not only affects the uniformity of the ink but also affects the flow rate of the ink discharge. In this technical solution, by setting a temperature control component on the inner surface of the mounting hole, it is possible to avoid changes in the discharge flow rate caused by temperature fluctuations during the continuous movement of the direct-write printing needle during the printing process. Therefore, the accuracy of the printed product obtained after printing is higher. high.

As a further preference, the temperature control assembly includes a temperature regulating component and a temperature sensor for measuring the surface temperature of the pneumatic direct writing printing needle.

This technical solution can reduce the size of the system by setting up a temperature-regulating component to control the temperature of the surface of the direct-write printing needle and a temperature sensor for measuring the surface temperature of the pneumatic direct-writing printing needle. Through the close cooperation between the temperature-regulating component and the temperature sensor, The surface temperature of the direct writing printing needle has a floating range, so the ink discharge from the direct writing printing needle outlet is more uniform, and the printed product obtained after printing is more precise. Specifically, the temperature regulating component can in principle be selected from any device that can regulate the temperature of the surface of the direct writing printing needle, such as electric heating wire, water circulation pipe, Peltier, etc.

A pneumatic direct writing printing needle includes any one of the above described topography control devices.

Preferably, the pneumatic direct writing printing needle includes a printing needle head mounting base, and a direct writing printing needle head disposed on the printing needle head mounting base; the direct writing printing needle head is provided with a liquid outlet at one end away from the printing needle head mounting base. port; along the ink flow direction of the liquid outlet, the cross section of the direct writing printing needle continuously decreases.

In this technical solution, by limiting the shape of the direct-writing printing needle applicable to the topography control device, on the one hand, the mechanical strength of the direct-writing printing needle will be improved as a whole, so the service life of the direct-writing printing needle will be longer; on the other hand, On the other hand, when the surface of the direct writing printing needle is equipped with a temperature control component, the ink temperature inside the direct writing printing needle can be further controlled before extruding the ink, thereby reducing the impact of the ink temperature on the flow rate of the direct writing printing needle outlet. , so the products obtained after printing have higher accuracy.

A direct writing printing device, including the pneumatic direct writing printing needle described in any one of the above.

Preferably, the direct writing printing device further includes a lifting assembly for driving the pneumatic direct writing printing needle to move up and down.

The above-mentioned method of using a direct writing printing device includes the following steps: during the acceleration and deceleration stage of direct writing printing, raise the direct writing printing needle so that the ink on the surface of the direct writing printing needle does not contact the printing substrate; open the suction component, The ink connected to the liquid guide port is sucked out along the liquid guide port and the suction slit in sequence.

In this technical solution, by setting up the structure of the liquid guide port and the matching method of raising the direct writing printing needle, based on the Coanda effect, in the process of raising the direct writing printing needle, the direct writing printing needle The ink on the surface will continue to accumulate upward along the liquid guide port, so the overall ink absorption effect is better and the process edge is shorter.

The above-mentioned method of using a direct-write printing device includes the following steps: during the acceleration and deceleration stage of direct-write printing, turn off the supply air pressure; open the suction component so that the ink connected to the liquid guide port flows along the liquid guide port in turn. and the material is sucked out through the suction slit.

Preferably, the method of using the direct writing printing device further includes the following steps:

S1. The monitoring probe of the temperature sensor collects the temperature data on the surface of the direct-writing printing needle, and then uploads the temperature data to the controller through the communication module of the temperature sensor;

S2. The controller analyzes the temperature data, and according to the analysis results, regulates the temperature of the direct writing printing needle surface by instructing the heating and cooling of the temperature regulating component.

Compared with the prior art, the present invention has the following beneficial effects:

By providing a brand new topography control device that can be installed on the direct writing printing needle, the present invention greatly reduces the length of the process edge and improves the utilization rate of the substrate; and uses the topography control device of the present invention The line height difference of the printed products obtained by printing is smaller, and the printed products produced have higher precision and better quality; in addition, the shape control device of the present invention has a simple structure, low preparation cost, and is easy to install, and can be used with The direct writing printing needle can be detachably connected and has high application flexibility. Specifically, first, the topography control device of the present invention provides a first surface, a second surface, a mounting hole penetrating the first surface and the second surface, and a first mounting port and a second mounting hole matching the mounting hole. The placement port will facilitate the installation of direct writing printing needles. Secondly, the shape control device of the present invention provides a liquid guide port on the second surface, a suction slit and a suction component that are connected to the liquid guide port in sequence, and limits the second placement port and the liquid outlet of the direct writing printing needle. The relationship between the diameter of the opening and the diameter of the opening can effectively solve the problem in the prior art that the process side of the printed product is too long. Thirdly, by adjusting the diameter relationship between the second placement port and the direct writing printing needle outlet, the present invention can realize that only when the ink on the surface of the direct writing printing needle outlet accumulates to a certain amount, the suction component will be triggered. The ink is absorbed, which effectively prevents the suction component from indiscriminately absorbing the ink on the surface of the direct writing needle outlet. Therefore, the quality of the uniform-speed printing products is also guaranteed. In addition, by arranging a temperature control component on the inner surface of the mounting hole, the present invention can avoid changes in the discharge flow rate caused by temperature fluctuations during the continuous movement of the direct-write printing needle during the printing process. Therefore, the accuracy of the printed product obtained after printing is improved. higher.

Description of drawings

In order to clearly explain the embodiment, the drawings of the accompanying drawings will be briefly introduced below:

FIG. 1 is a cross-sectional view of the topography control device of Embodiment 3.

Figure 2 is a cross-sectional view of the direct writing printing needle of Embodiment 4.

Figure 3 shows the printing path of the direct writing printing device in Embodiment 6, in which the white path part is the part that raises the direct writing printing needle.

Figure 4 is an enlarged view of the partial morphology of the finished printed product obtained in Example 6.

Figure 5 is a graph showing line height data at different positions within the effective area of the printed product obtained in Example 6.

Figure 6 is an enlarged view of the partial morphology of the finished printed product obtained in Comparative Example 1.

Figure 7 is a graph showing line height data at different positions within the effective area of the printed product obtained in Comparative Example 1.

The reference numbers are as follows: 1. First surface, 2. Second surface, 3. Installation hole, 11. First placement port, 21. Second placement port, 4. Material control component, 41. Suction slit, 42 , Suction component, 43. Liquid guide port, 5. Temperature control component, 51. Temperature adjustment component, 52. Temperature sensor, 6. Printing needle mounting base, 7. Direct writing printing needle, 71. Liquid outlet.

Detailed ways

The present invention will be further described below and by way of specific examples. A person of ordinary skill in the art will be able to implement the present invention based on these descriptions. In addition, the embodiments of the present invention mentioned in the following description are generally only some embodiments of the present invention, rather than all the embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts should fall within the scope of protection of the present invention.

Example 1

This embodiment discloses a topography control device for a pneumatic direct writing printing needle. The topography control device includes:

The first surface 1 and the second surface 2 are arranged correspondingly up and down, and the mounting hole 3 that penetrates the first surface 1 and the second surface 2 for mounting the direct writing printing needle 7; one end of the mounting hole 3 is connected to the first surface 1 and the second surface 2. The surface 1 forms a first installation opening 11 , and the other end of the installation hole 3 and the second surface 2 form a second installation opening 21 . The topography control device of this embodiment is provided with a first surface 1, a second surface 2, a mounting hole 3 penetrating the first surface 1 and the second surface 2, and a first mounting opening 11 matching the mounting hole 3. and the second installation port 21, which provides great convenience for the subsequent installation of the direct writing printing needle 7. Specifically, during the installation process of the topography control device, it is only necessary to pass the liquid outlet 71 of the direct writing printing needle 7 through the first placement port 11 and the second placement port 21 in sequence, so that the topography control device is nested in Just inside the mounting hole 3. At this time, the first installation opening 11 , the second installation opening 21 and the installation hole 3 form a tight connection with part or all of the side surface of the direct writing printing needle 7 , and the installation is completed. It can be seen that the installation method of the above device is simple, and there is no need to make structural changes to the pneumatic direct writing printing needle 7. The application flexibility is greater, and the maintenance and replacement of the topography control device are convenient. In addition, in order to further facilitate installation, the outer surface of the topography control device in this embodiment is in the shape of a truncated cone, and its material is selected from rubber.

In order to absorb the ink on the surface of one end of the liquid outlet 71 of the direct writing printing needle 7, the topography control device of this embodiment also includes a material control component 4. The material control assembly 4 includes a material suction slit 41 that penetrates the second surface 2, and a material suction component 42 connected throughly with one end of the material suction slit 41 close to the first surface 1; the material suction slit 41 is close to the first surface 1. A liquid guide port 43 is formed on one side of the second surface 2 for guiding the ink on one end surface of the liquid outlet 71 of the direct writing printing needle 7 to flow along the suction slit 41 . In this embodiment, in order to simplify the internal structure of the topography control device and reduce the difficulty of preparing the device to a certain extent, the suction slits 41 are two holes penetrating the second surface 2 . In addition, in order to enable the ink accumulated on the surface of the liquid outlet 71 of the direct writing printing needle 7 to quickly contact the liquid guide port 43 during the acceleration and deceleration stage, and further shorten the length of the process side, the liquid guide port 43 is kept away from the second placement port. The second surface 2 connected to the center side of 21 is higher than the second surface 2 close to the center side of the second placement opening 21 .

In addition, when the second surface 2 is close to or even concentric with the liquid outlet 71 of the direct writing printing needle 7 , the ink discharge will inevitably touch the second surface 2 , especially the liquid guide port provided close to the liquid outlet 71 43. Therefore, on the one hand, the ink morphology in both the constant speed section and the acceleration and deceleration section of printing will be affected; on the other hand, the normal flow of ink is easily sucked out by the suction component 42 . Therefore, in order to prevent the suction component 42 from indiscriminately absorbing the ink on the surface of the liquid outlet 71 of the direct writing printing needle 7, while ensuring the quality of the printing products in the constant speed section, shortening the process edge length and reducing printing waste, this implementation In this example, the diameter of the second placement port 21 is larger than the diameter of the liquid outlet 71 of the direct writing printing needle. This means that by adjusting the liquid level difference between the second surface 2 and the liquid outlet 71, it is possible to make only direct printing When the ink on the surface of the liquid outlet 71 of the printing needle 7 accumulates to a certain amount, the suction component will be triggered to absorb the ink.

Example 2

This embodiment discloses a topography control device for a pneumatic direct writing printing needle. The topography control device includes:

The first surface 1 and the second surface 2 are arranged correspondingly up and down, and the mounting hole 3 that penetrates the first surface 1 and the second surface 2 for mounting the direct writing printing needle 7; one end of the mounting hole 3 is connected to the first surface 1 and the second surface 2. The surface 1 forms a first installation opening 11 , and the other end of the installation hole 3 and the second surface 2 form a second installation opening 21 . The topography control device of this embodiment is provided with a first surface 1, a second surface 2, a mounting hole 3 penetrating the first surface 1 and the second surface 2, and a first mounting opening 11 matching the mounting hole 3. and the second installation port 21, which provides great convenience for the subsequent installation of the direct writing printing needle 7. Specifically, during the installation process of the topography control device, it is only necessary to pass the liquid outlet 71 of the direct writing printing needle 7 through the first placement port 11 and the second placement port 21 in sequence, so that the topography control device is nested in Just inside the mounting hole 3. At this time, the first installation opening 11 , the second installation opening 21 and the installation hole 3 form a tight connection with part or all of the side surface of the direct writing printing needle 7 , and the installation is completed. It can be seen that the installation method of the above device is simple, and there is no need to make structural changes to the pneumatic direct writing printing needle 7. The application flexibility is greater, and the maintenance and replacement of the topography control device are convenient. In addition, the outer surface of the topography control device in this embodiment has a rectangular parallelepiped shape, and its material is selected from aluminum.

In order to absorb the ink on the surface of one end of the liquid outlet 71 of the direct writing printing needle 7, the topography control device of this embodiment also includes a material control component 4. The material control assembly 4 includes a material suction slit 41 that penetrates the second surface 2, and a material suction component 42 connected throughly with one end of the material suction slit 41 close to the first surface 1; the material suction slit 41 is close to the first surface 1. A liquid guide port 43 is formed on one side of the second surface 2 for guiding the ink on one end surface of the liquid outlet 71 of the direct writing printing needle 7 to flow along the suction slit 41 . In this embodiment, the material suction slit 41 is an annular material suction slit 41 surrounding the second placement opening 21 and coaxially arranged therewith. By setting the annular suction slit 41, on the one hand, a larger accommodation space is provided for ink suction, so it can be applied to the direct writing printing needle 7 with a large amount of ink accumulation; on the other hand, it can also increase the conductivity of the ink. The liquid port 43 is in contact with the ink. Therefore, as the ink in the direct writing needle outlet 71 located at the center continues to accumulate, the ink will come into contact with the liquid guide ports 43 evenly distributed around it. At this time, the suction part 42 The ink absorption effect is better, the ink residue on the surface of the direct writing printing needle outlet 71 is less, and the length of the process edge can be further shortened. In addition, in order to enable the ink accumulated on the surface of the liquid outlet 71 of the direct writing printing needle 7 to quickly contact the liquid guide port 43 during the acceleration and deceleration stage, and further shorten the length of the process side, the liquid guide port 43 is kept away from the second placement port. The second surface 2 connected to the center side of 21 is higher than the second surface 2 close to the center side of the second placement opening 21 .

In addition, when the second surface 2 is close to or even concentric with the liquid outlet 71 of the direct writing printing needle 7 , the ink discharge will inevitably touch the second surface 2 , especially the liquid guide port provided close to the liquid outlet 71 43. Therefore, on the one hand, the ink morphology in both the constant speed section and the acceleration and deceleration section of printing will be affected; on the other hand, the normal flow of ink is easily sucked out by the suction component 42 . Therefore, in order to prevent the suction component 42 from indiscriminately absorbing the ink on the surface of the liquid outlet 71 of the direct writing printing needle 7, while ensuring the quality of the printing products in the constant speed section, shortening the process edge length and reducing printing waste, this implementation In this example, the diameter of the second placement port 21 is larger than the diameter of the liquid outlet 71 of the direct writing printing needle. This means that by adjusting the liquid level difference between the second surface 2 and the liquid outlet 71, it is possible to make only direct printing When the ink on the surface of the liquid outlet 71 of the printing needle 7 accumulates to a certain amount, the suction component will be triggered to absorb the ink.

Example 3

This embodiment discloses a topography control device for a pneumatic direct writing printing needle. The topography control device includes:

The first surface 1 and the second surface 2 are arranged correspondingly up and down, and the mounting hole 3 that penetrates the first surface 1 and the second surface 2 for mounting the direct writing printing needle 7; one end of the mounting hole 3 is connected to the first surface 1 and the second surface 2. The surface 1 forms a first installation opening 11 , and the other end of the installation hole 3 and the second surface 2 form a second installation opening 21 . The topography control device of this embodiment is provided with a first surface 1, a second surface 2, a mounting hole 3 penetrating the first surface 1 and the second surface 2, and a first mounting opening 11 matching the mounting hole 3. and the second installation port 21, which provides great convenience for the subsequent installation of the direct writing printing needle 7. Specifically, during the installation process of the topography control device, it is only necessary to pass the liquid outlet 71 of the direct writing printing needle 7 through the first placement port 11 and the second placement port 21 in sequence, so that the topography control device is nested in Just inside the mounting hole 3. At this time, the first installation opening 11 , the second installation opening 21 and the installation hole 3 form a tight connection with part or all of the side surface of the direct writing printing needle 7 , and the installation is completed. It can be seen that the installation method of the above device is simple, and there is no need to make structural changes to the pneumatic direct writing printing needle 7. The application flexibility is greater, and the maintenance and replacement of the topography control device are convenient. In addition, the outer surface of the topography control device in this embodiment has a truncated cone shape, and its material is selected from copper.

In order to absorb the ink on the surface of one end of the liquid outlet 71 of the direct writing printing needle 7, the topography control device of this embodiment also includes a material control component 4. The material control assembly 4 includes a material suction slit 41 that penetrates the second surface 2, and a material suction component 42 connected throughly with one end of the material suction slit 41 close to the first surface 1; the material suction slit 41 is close to the first surface 1. A liquid guide port 43 is formed on one side of the second surface 2 for guiding the ink on one end surface of the liquid outlet 71 of the direct writing printing needle 7 to flow along the suction slit 41 . In this embodiment, the material suction slit 41 is an annular material suction slit 41 surrounding the second placement opening 21 and coaxially arranged therewith. By setting the annular suction slit 41, on the one hand, a larger accommodation space is provided for ink suction, so it can be applied to the direct writing printing needle 7 with a large amount of ink accumulation; on the other hand, it can also increase the conductivity of the ink. The liquid port 43 is in contact with the ink. Therefore, as the ink in the direct writing needle outlet 71 located at the center continues to accumulate, the ink will come into contact with the liquid guide ports 43 evenly distributed around it. At this time, the suction part 42 The ink absorption effect is better, the ink residue on the surface of the direct writing printing needle outlet 71 is less, and the length of the process edge can be further shortened. In addition, in order to enable the ink accumulated on the surface of the liquid outlet 71 of the direct writing printing needle 7 to quickly contact the liquid guide port 43 during the acceleration and deceleration stage, and further shorten the length of the process side, the liquid guide port 43 is kept away from the second placement port. The second surface 2 connected to the center side of 21 is higher than the second surface 2 close to the center side of the second placement opening 21 . When the second surface 2 is close to or even concentric with the liquid outlet 71 of the direct writing printing needle 7 , the ink discharge will inevitably touch the second surface 2 , especially the liquid guide port 43 provided close to the liquid outlet 71 . Therefore, on the one hand, the ink morphology in both the constant speed section and the acceleration and deceleration section of printing will be affected; on the other hand, the normal flow of ink is easily sucked out by the suction component 42 . Therefore, in order to prevent the suction component 42 from indiscriminately absorbing the ink on the surface of the liquid outlet 71 of the direct writing printing needle 7, while ensuring the quality of the printing products in the constant speed section, shortening the process edge length and reducing printing waste, this implementation In this example, the diameter of the second placement port 21 is larger than the diameter of the liquid outlet 71 of the direct writing printing needle. This means that by adjusting the liquid level difference between the second surface 2 and the liquid outlet 71, it is possible to make only direct printing When the ink on the surface of the liquid outlet 71 of the printing needle 7 accumulates to a certain amount, the suction component will be triggered to absorb the ink.

In addition, in order to avoid changes in ink flow caused by surface temperature fluctuations of the direct writing printing needle 7 during the continuous movement of the direct writing printing needle 7, the inner surface of the mounting hole 3 of the topography control device of this embodiment is provided with a The temperature control component 5 controls the surface temperature of the direct writing printing needle 7 . The temperature control assembly 5 includes a temperature regulating component 51 for controlling the surface temperature of the direct writing printing needle 7 and a temperature sensor 52 for measuring the surface temperature of the pneumatic direct writing printing needle 7 . In order to fully regulate the temperature of the surface of the direct writing printing needle 7, in this embodiment, the temperature regulating component 51 uses an electric heating wire.

Example 4

This embodiment discloses a pneumatic direct writing printing needle. The pneumatic direct writing printing needle includes:

The printing needle mounting base 6, and the direct writing printing needle 7 arranged on the printing needle mounting base 6; the direct writing printing needle 7 is provided with a liquid outlet 71 at one end away from the printing needle mounting base 6; along the liquid outlet In the ink flow direction of the port 71, the cross section of the direct writing printing needle 7 is continuously reduced. In this embodiment, the shape of the direct writing printing needle 7 is specially designed. On the one hand, the mechanical strength of the direct writing printing needle 7 will be improved, so the service life of the direct writing printing needle 7 will be longer; on the other hand, when extruding ink, Before, the temperature regulating component 41 can further control the ink temperature inside the direct writing printing needle 7 and reduce the impact of the ink temperature on the ink flow rate of the liquid outlet 71 of the direct writing printing needle 7. Therefore, the quality of the product obtained after printing is Higher accuracy. The direct writing printing needle 7 is equipped with a topography control device, and the topography control device includes:

The first surface 1 and the second surface 2 are arranged correspondingly up and down, and the mounting hole 3 that penetrates the first surface 1 and the second surface 2 for mounting the direct writing printing needle 7; one end of the mounting hole 3 is connected to the first surface 1 and the second surface 2. The surface 1 forms a first installation opening 11 , and the other end of the installation hole 3 and the second surface 2 form a second installation opening 21 . The topography control device of this embodiment is provided with a first surface 1, a second surface 2, a mounting hole 3 penetrating the first surface 1 and the second surface 2, and a first mounting opening 11 matching the mounting hole 3. and the second installation port 21, which provides great convenience for the subsequent installation of the direct writing printing needle 7. Specifically, during the installation process of the topography control device, it is only necessary to pass the liquid outlet 71 of the direct writing printing needle 7 through the first placement port 11 and the second placement port 21 in sequence, so that the topography control device is nested in Just inside the mounting hole 3. At this time, the first installation opening 11 , the second installation opening 21 and the installation hole 3 form a tight connection with part or all of the side surface of the direct writing printing needle 7 , and the installation is completed. It can be seen that the installation method of the above device is simple, and there is no need to make structural changes to the pneumatic direct writing printing needle 7. The application flexibility is greater, and the maintenance and replacement of the topography control device are convenient. In addition, in order to further facilitate installation, the outer surface of the topography control device in this embodiment is in the shape of a truncated cone, and its material is selected from rubber.

In order to absorb the ink on the surface of one end of the liquid outlet 71 of the direct writing printing needle 7, the topography control device of this embodiment also includes a material control component 4. The material control assembly 4 includes a material suction slit 41 that penetrates the second surface 2, and a material suction component 42 connected throughly with one end of the material suction slit 41 close to the first surface 1; the material suction slit 41 is close to the first surface 1. A liquid guide port 43 is formed on one side of the second surface 2 for guiding the ink on one end surface of the liquid outlet 71 of the direct writing printing needle 7 to flow along the suction slit 41 . In this embodiment, the material suction slit 41 is an annular material suction slit 41 surrounding the second placement opening 21 and coaxially arranged therewith. By setting the annular suction slit 41, on the one hand, a larger accommodation space is provided for ink suction, so it can be applied to the direct writing printing needle 7 with a large amount of ink accumulation; on the other hand, it can also increase the conductivity of the ink. The liquid port 43 is in contact with the ink. Therefore, as the ink in the direct writing needle outlet 71 located at the center continues to accumulate, the ink will come into contact with the liquid guide ports 43 evenly distributed around it. At this time, the suction part 42 The ink absorption effect is better, the ink residue on the surface of the direct writing printing needle outlet 71 is less, and the length of the process edge can be further shortened. In addition, in order to enable the ink accumulated on the surface of the liquid outlet 71 of the direct writing printing needle 7 to quickly contact the liquid guide port 43 during the acceleration and deceleration stage, and further shorten the length of the process side, the liquid guide port 43 is kept away from the second placement port. The second surface 2 connected to the center side of 21 is higher than the second surface 2 close to the center side of the second placement opening 21 . When the second surface 2 is close to or even concentric with the liquid outlet 71 of the direct writing printing needle 7 , the ink discharge will inevitably touch the second surface 2 , especially the liquid guide port 43 provided close to the liquid outlet 71 . Therefore, on the one hand, the ink morphology in both the constant speed section and the acceleration and deceleration section of printing will be affected; on the other hand, the normal flow of ink is easily sucked out by the suction component 42 . Therefore, in order to prevent the suction component 42 from indiscriminately absorbing the ink on the surface of the liquid outlet 71 of the direct writing printing needle 7, while ensuring the quality of the printing products in the constant speed section, shortening the process edge length and reducing printing waste, this implementation In this example, the diameter of the second placement port 21 is larger than the diameter of the liquid outlet 71 of the direct writing printing needle. This means that by adjusting the liquid level difference between the second surface 2 and the liquid outlet 71, it is possible to make only direct printing When the ink on the surface of the liquid outlet 71 of the printing needle 7 accumulates to a certain amount, the suction component will be triggered to absorb the ink.

In addition, in order to avoid changes in ink flow caused by surface temperature fluctuations of the direct writing printing needle 7 during the continuous movement of the direct writing printing needle 7, the inner surface of the mounting hole 3 of the topography control device of this embodiment is provided with a The temperature control component 5 controls the surface temperature of the direct writing printing needle 7 . The temperature control assembly 5 includes a temperature regulating component 51 for controlling the surface temperature of the direct writing printing needle 7 and a temperature sensor 52 for measuring the surface temperature of the pneumatic direct writing printing needle 7 . In order to fully regulate the temperature of the surface of the direct writing printing needle 7, in this embodiment, the temperature regulating component 51 is an electric heating wire.

Example 5

This embodiment discloses a direct writing printing device. The direct writing printing device includes the pneumatic direct writing printing needle described in Embodiment 4, and a lifting assembly that drives the pneumatic direct writing printing needle to move up and down. Other structures of the direct-write printing device are the same as or similar to those in the prior art, and will not be described in detail here.

Example 6

This embodiment discloses a printing method for reciprocating printing using the direct-write printing device described in Embodiment 5. Please refer to Figure 3 for the printing path. Specifically:

In this embodiment, the printing speed of the direct writing printing needle 7 in the constant speed stage is 200mm/s, and the acceleration in the acceleration and deceleration stage is 2m/s². When the printing speed of the direct writing printing needle 7 is lower than the uniform speed stage, the ink on the surface of the liquid outlet 71 of the direct writing printing needle 7 continues to accumulate. At this time, the lifting assembly is started to raise the direct writing printing needle 7 so that the direct writing printing needle 7 The ink on the surface of the direct writing printing needle 7 does not contact the printing substrate; at the same time, the suction component 42 is started, so when the ink on the surface of the liquid outlet 71 of the direct writing printing needle 7 accumulates to a certain amount, until the ink contacts the liquid guide port 43, the suction The material component 42 will absorb the ink from the liquid outlet 71, so that the ink will be sucked out along the liquid guide port 43 and the suction slit 41 in sequence. After being sucked out, there will be no traces of dripping ink remaining on the surface of the printing substrate, and it will be recycled. The resulting ink can still be used again.

In addition, in this embodiment, the temperature control component 5 is also regulated to further improve the accuracy of the printed product. Specifically, the monitoring probe of the temperature sensor 52 collects the temperature data on the surface of the direct-writing printing needle 7, and then uploads the temperature data to the controller through the communication module of the temperature sensor 52; the controller analyzes the temperature data, and based on the analysis results , by instructing the heating and cooling of the temperature regulating component 51 to regulate the temperature on the surface of the direct writing printing needle 7 .

Example 7

This embodiment discloses a printing method for reciprocating printing using the direct-write printing device described in Embodiment 5. Please refer to Figure 3 for the printing path. Specifically:

In this embodiment, the printing speed of the direct writing printing needle 7 in the constant speed stage is 200mm/s, and the acceleration in the acceleration and deceleration stage is 2m/s². When the printing speed of the direct writing printing needle 7 is lower than the uniform speed stage, the ink on the surface of the liquid outlet 71 of the direct writing printing needle 7 continues to accumulate. At this time, the supply air pressure is turned off. Due to the delay effect of the air pressure response, the direct writing printing needle 7 Some ink will still be squeezed out slowly on the surface; start the suction part 42 to suck the ink from the liquid outlet 71, so that the ink is sucked out along the liquid guide port 43 and the suction slit 41 in sequence. After being sucked out, the substrate is printed. There will be no traces of ink dripping remaining on the surface, and the recycled ink can still be used again.

In addition, in this embodiment, the temperature control component 5 is also regulated to further improve the accuracy of the printed product. Specifically, the monitoring probe of the temperature sensor 52 collects the temperature data on the surface of the direct-writing printing needle 7, and then uploads the temperature data to the controller through the communication module of the temperature sensor 52; the controller analyzes the temperature data, and based on the analysis results , by instructing the heating and cooling of the temperature regulating component 51 to regulate the temperature on the surface of the direct writing printing needle 7 .

Comparative example 1

Comparative Example 1 is a direct-write printing device without the topography control device of the present invention installed. The difference between the printing path of the direct writing printing device and Example 6 is that the comparative example 1 does not lift the direct writing printing needle 7) during the acceleration and deceleration stage, and the printing speed and acceleration are consistent with Example 6.

Performance Testing

For the printed products produced in Example 6 and Comparative Example 1, the process edge morphology was analyzed, the line height data of the uniform-speed effective printing area was measured, and charts were drawn to obtain Figures 4 to 7.

Referring to Figures 4 and 6, by observing the enlarged partial morphology of the printed products produced by the direct-write printing equipment of Example 6 and Comparative Example 1, it can be found that the process edge length of the printed product of Comparative Example 1 is as high as 10mm, and The process edge of the printed product obtained by the present invention is only 1/5 of the process edge length of Comparative Example 1. It can be seen that the present invention can effectively solve the problem of existing problems by installing a topography control device on the direct writing printing needle head and using a special method of use. There is a problem that the process side of the printed product is too long, which greatly reduces the waste of ink during the printing process.

Please refer to Figures 5 and 7. By observing the line height differences of the same line in different printing areas of the printed products produced in Example 6 and Comparative Example 1, as well as the line height differences of different lines in the same printing area, it can be found that Comparative Example 1 In the printed product obtained, the line heights between multiple printing lines in the same area are relatively scattered, and the line height difference between the same printing line in different areas is large. This is reflected in the morphology as the height of the same line in the effective area. The unevenness is mutually confirmed with the rough topography of the uniform-speed effective printing area in Figure 6. It can be seen that the existing direct-write printing equipment not only has long process sides, but also has low overall printing accuracy. Looking back at Figure 5, it can be found that the line height concentration between each printing line in the printing product produced by the present invention is relatively high, and the line height difference between the same printing line in different areas is small. It can be seen that by using the direct writing printing needle Installing a topography control device and using it with special methods can not only effectively solve the problem of too long process edges of existing printing products, but also further improve printing accuracy.

Although this article uses the reference numbers in the figure a lot: 1. First surface, 2. Second surface, 3. Mounting hole, 11. First placement port, 21. Second placement port, 4. Control material component, 41. Suction slit, 42. Suction component, 43. Liquid guide port, 5. Temperature control component, 51. Temperature adjustment component, 52. Temperature sensor, 6. Printing needle installation base, 7. Direct writing printing needle , 71, liquid outlet and other terms, but this does not exclude the possibility of using other terms. These terms are only used to more conveniently describe and explain the essence of the present invention; interpreting them as any kind of additional limitation is contrary to the spirit of the present invention.

Claims (10)

1. The morphology control device for the pneumatic direct-writing printing pinhead is characterized by comprising a first surface and a second surface which are correspondingly arranged, and a mounting hole penetrating through the first surface and the second surface and used for mounting the direct-writing printing pinhead; one end of the mounting hole and the first surface form a first placement opening, and the other end of the mounting hole and the second surface form a second placement opening; the morphology control device further comprises a control material assembly, wherein the control material assembly comprises a material sucking slit penetrating through the second surface and a material sucking part in through connection with one end, close to the first surface, of the material sucking slit; and a liquid guide port for guiding the ink on the liquid outlet surface of the direct-writing printing needle head to flow along the material suction slit is formed on one side of the material suction slit close to the second surface, and the diameter of the second placement port is larger than that of the liquid outlet of the direct-writing printing needle head.

2. The topography control device for a pneumatic direct write printhead of claim 1, wherein said suction slit is coaxially disposed with said second mounting port.

3. A form control device for a pneumatic write-through printing head according to any one of claims 1 or 2, characterized in that the inside surface of the mounting hole is provided with a temperature control assembly for controlling the surface temperature of the write-through printing head.

4. A topography control device for a pneumatic write-through stylus according to claim 3, wherein the temperature control assembly comprises a temperature regulating component and a temperature sensor for determining the temperature of the surface of the pneumatic write-through stylus.

5. A pneumatic direct write printing needle comprising the topography control device of any one of claims 1-4.

6. A pneumatic direct write printing pin as defined in claim 5, wherein the pneumatic direct write printing pin comprises a printing pin mounting base and a direct write printing pin disposed on the printing pin mounting base; a liquid outlet is formed in one end, far away from the printing needle mounting base, of the direct-writing printing needle; along the flowing direction of the liquid outlet ink, the section of the direct-writing printing needle head is continuously reduced.

7. A direct write printing apparatus comprising a pneumatic direct write printing needle as claimed in any one of claims 5 or 6.

8. The direct write printing apparatus of claim 7, further comprising a lift assembly for moving the pneumatic direct write printing needle up and down.

9. A method of using the direct-write printing apparatus, characterized in that the direct-write printing apparatus according to any one of claims 7 or 8 is used; the using method comprises the following steps: in the acceleration and deceleration stage of direct-writing printing, the direct-writing printing needle head is lifted, so that the ink on the surface of the direct-writing printing needle head is not contacted with a printing substrate, and the material sucking component is started, so that the ink connected with the liquid guide port is sucked out along the liquid guide port and the material sucking slit in sequence; or in the acceleration and deceleration stage of direct-writing printing, the feeding air pressure is closed, and the material sucking component is opened, so that the ink connected with the liquid guide port is sucked out along the liquid guide port and the material sucking slit in sequence.

10. The method of use of claim 9, further comprising the steps of:

s1, a monitoring probe of a temperature sensor collects temperature data of the surface of a direct-write printing needle head, and the temperature data is uploaded to a controller through a communication module of the temperature sensor;

s2, the controller analyzes the temperature data, and regulates and controls the temperature of the surface of the direct-writing printing needle head by commanding the temperature regulating component to raise and lower according to the analysis result.