Aerosol inkjet printing device and deposition efficiency regulation method thereof

Abstract

The present application provides an aerosol inkjet printing device and its deposition efficiency regulation method, which adopts the way of adding annular thermal field to aerosol ink flow jet channel, changes the density of gas-liquid phase flow field of aerosol printing system, adjusts the characteristic distribution of high Reynolds number flow field, and then focuses the aerosol ink particles on the axis-diameter. Based on heat transfer / distribution, computational fluid dynamics and particle dynamics, the temperature field characteristic distribution model of aerosol printing system and the focusing motion model of aerosol nano-ink particles are established respectively; the thermal field distribution characteristics of specific ink under specific deposition characteristics requirements are calculated through numerical simulation, and then the inline online thermal field input parameters (temperature value and thermal cycle rate) are determined; the inline online thermal field obtained by the above calculation and analysis is constructed for the aerosol ink flow jet environment, the longitudinal distribution density of aerosol ink deposition is improved, and finally the reliable optimization and regulation of aerosol inkjet printing deposition efficiency (deposition distribution aspect ratio) are realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aerosol inkjet printing technology, and particularly relates to an aerosol inkjet printing device and a deposition efficiency regulation method thereof. BACKGROUND

[0002] With the rapid development of aerospace technology, the conformalization, intelligentization, and high integration of electronic systems have become the key technical targets of advanced equipment. As an innovative solution that can achieve high-performance electronic functions on complex curved surfaces, conformal printing has become an important direction for the development of advanced aerospace equipment, and has made significant progress in major military projects in various countries in recent years. Aerosol inkjet printing technology, as a new type of conformal electronic printing technology, has non-contact and high-precision printing characteristics, and can realize the conformal printing of active and passive electronic components and sensors. Currently, the optimization research on this technology has become a research hotspot in recent years.

[0003] Aerosol inkjet printing technology can adapt to a variable pitch of 1-5 mm and perform non-contact printing, thereby better adapting to objects to be deposited with complex geometric characteristics such as hyperbolicity and variable curvature. In addition, it also has a high printing resolution of 5 μm and a wide printable ink range (particle size < 50 nm, viscosity 1-1000 cP), and has become the most reliable method for conformal manufacturing of complex curved structure substrates. Its core working principle is to atomize functional conductive / dielectric ink into aerosol through pneumatic / ultrasonic oscillation, then use inert carrier gas (nitrogen) to transport the aerosol ink to the printing head, and then focus the aerosol ink flow through inert sheath gas flow and jet it to the target substrate at a speed of 10-100 m / s to form a non-solid deposition, and finally obtain the final conformal functional structure through high-temperature sintering / photocuring, etc. Currently, aerosol inkjet printing technology process optimization and conformal electronic application research based on this technology are rapidly developing, and have achieved performance comparable to or even better than commercial capacitors, inductors, and sensors.

[0004] However, the aerosol jet deposition three-dimensional morphology has a low and constant aspect ratio, and the longitudinal height of the deposition directly determines the deposition efficiency, that is, the deposition amount per unit printing time or unit printing length; the lateral width of the deposition determines the printing precision, which makes aerosol inkjet printing, especially in terms of deposition efficiency, face the following problems:

[0005] (1) In the process of high-precision printing using aerosol inkjet printing, a lower ink flow deposition rate is required, which makes the printing efficiency too low, especially for high-precision large-scale aerosol inkjet printing, whose process time can be several times higher than that of low-precision printing;

[0006] (2) The deposition amount corresponding to a lower deposition rate is low, and excessive spraying itself will significantly increase, which will significantly increase the defects of aerosol inkjet printing;

[0007] (3) If high deposition distribution aspect ratio is achieved by multi-layer printing, the error superposition of multi-layer printing will reduce the forming quality;

[0008] (4) If the deposition rate is increased, although the unit deposition amount / deposition height is increased, due to the excessively low deposition aspect ratio, the deposition line width is increased, and the printing resolution is insufficient;

[0009] (5) In addition, in order to avoid the mutual interference between ink flows, the line width spacing needs to be increased when planning the printing path, which limits the design freedom and integration of the functional conformal circuit, and even affects the functional characteristics of the electronic circuit.

[0010] Aerosol inkjet printing is facing the engineering contradiction of "improving printing accuracy and insufficient deposition efficiency; increasing deposition rate and increasing printing line width", which seriously affects the expected comprehensive performance of conformal electronics. Therefore, if the deposition efficiency / aspect ratio during ink deposition cannot be reliably controlled, the aerosol inkjet printing technology will be difficult to apply to high-quality, high-precision, and high-efficiency conformal electronic manufacturing. SUMMARY

[0011] In view of the problem of low deposition efficiency (deposition distribution aspect ratio) of the existing aerosol inkjet printing technology, considering the characteristics of significant physical field interference effect of thermal field, high stability, etc., it is one of the effective means for microfluidic and particle manipulation. The present application significantly improves the deposition efficiency of aerosol inkjet printing by adding an inline online heating mechanism during aerosol inkjet printing.

[0012] Specifically, the first aspect of the present application provides an aerosol inkjet printing device comprising: an aerosol printing head and a hot water circulation system, the aerosol printing head is composed of an upper oil-gas mixing part and a lower nozzle, the nozzle is provided with a transition pipeline in communication with the oil-gas mixing part;

[0013] The aerosol ink, carrier gas and sheath gas are input from the oil-gas channel of the oil-gas mixing part and converge into the jet channel at the center of the transition pipeline above the nozzle, and then are sprayed from the lower end of the nozzle to realize aerosol inkjet printing;

[0014] The transition pipeline is provided with a spiral circulating water bath flow channel inside the side wall, and the hot water circulation system can circulate hot water into the spiral circulating water bath flow channel, so that the center jet channel of the transition pipeline is in a stable annular thermal field.

[0015] As a further illustration of the present application, the hot water circulation system comprises a water bath heater and a water bath circulation micro-flow pump, the water inlet pipe and the water outlet pipe of the water bath heater are connected to the water inlet and outlet of the spiral circulation water bath flow channel in sequence, respectively, wherein the water bath heater has heating and heat preservation functions, can control the temperature of the circulating water bath to a specific value, the water bath circulation micro-flow pump can set a specific circulation flow rate, and can ensure that the jet channel is in a stable annular thermal field by adjusting the circulation flow rate.

[0016] As a further illustration of the present application, the oil and gas channel comprises an aerosol ink and carrier gas channel located at the center of the oil and gas mixing part and a sheath gas channel distributed in a reverse tapered shape along the inner circumference of the side wall of the oil and gas mixing part, and the aerosol ink and carrier gas channel and the sheath gas channel are communicated with the upper end of the jet channel after converging at the bottom.

[0017] The second aspect of the present application provides an aerosol inkjet printing deposition efficiency control method, comprising the following steps:

[0018] Step 1: According to the deposition requirements of aerosol inkjet printing, the corresponding single-layer deposition height is obtained, and the deposition distribution aspect ratio is determined by the single-layer deposition height and the deposition line width;

[0019] Step 2: Based on the material properties of the aerosol nano-ink, the gas / liquid flow field characteristic distribution law under the constraint of the temperature field and the force-motion condition of the aerosol nano-ink particles in the jetting / deposition process are analyzed, and a jetting / deposition motion model of the aerosol nano-ink particles under the constraint of the temperature field is constructed;

[0020] Step 3: Based on the jetting / deposition motion model obtained in step 2, the deposition distribution aspect ratio obtained in step 1 is used to solve the temperature value of the hot field with online heating;

[0021] Step 4, based on the structure form of the aerosol inkjet printing device and the thermal conductivity characteristics of the materials thereof, and considering the hot circulation flow rate, a hot transfer mechanism of online heating is constructed;

[0022] Step 5: Based on the heat transfer mechanism and the temperature value of the hot field obtained in step 3, the heating temperature of the water bath heating end and the hot circulation flow rate are determined;

[0023] Step 6: According to the heating temperature and the hot circulation flow rate of the water bath heating end obtained in step 5, the output temperature and the circulation pump flow rate of the heating end are adjusted in real time, online heating assisted aerosol inkjet printing is realized, and finally the deposition efficiency of aerosol inkjet printing is controlled.

[0024] As a further illustration of the present application, the deposition requirements specifically include printing accuracy, deposition spacing, deposition line layout, and interconnection layer number.

[0025] As a further illustration of the present application, the material properties include ink particle size, particle / solvent density, solvent viscosity.

[0026] As a further illustration of the present application, in step 2, in the process of analyzing the force-motion of the aerosol nano-ink particles in the ejection / deposition process, wherein the force includes the fluid drag of the solvent and the sheath gas, and the motion includes the velocity of the ink particles in the axial direction of the channel.

[0027] As a further illustration of the present application, the temperature field constraint is specifically: by setting an online heating auxiliary system on the periphery of the ejection channel of the aerosol inkjet printing device, the motion process of the aerosol nano-ink is constrained by the external heating condition.

[0028] Compared with the prior art, the present application has the following beneficial technical effects:

[0029] (1) The circulating heating water bath temperature input in the method can be obtained according to the deposition efficiency requirement of the inkjet, combined with the aerosol ink material properties, the inkjet environment, and the simulation calculation of the aerosol ink particle focusing by the external heating field, and the temperature parameter of the water bath heating end is accurately output by adjusting, so as to realize the quantitative focusing of the aerosol inkjet ink particles;

[0030] (2) The thermal response of the water bath heating end is online controllable, which can adjust the temperature parameter of the water bath heating end in real time according to the inkjet requirement and the change of the inkjet material, so as to realize the online regulation and control of the aerosol inkjet ink particle focusing effect;

[0031] (3) The method has no limitation requirement on the physical and chemical properties of the aerosol inkjet ink material, and is widely applicable to the ink materials in the inkjet range of the aerosol inkjet method;

[0032] (4) The method has no interference to the aerosol inkjet system and no destructive effect on the ink material of the aerosol inkjet, including physical and chemical effects.

[0033] Other features and advantages of the present application will be described in the following description, and some will become apparent from the description, or will be understood by those skilled in the art through implementation of the present application. The purpose and other advantages of the present application can be achieved and obtained by the structure specifically pointed out in the written description and the drawings.

[0034] The technical solution of the present application will be further described in detail below by means of the drawings and examples. DETAILED DESCRIPTION

[0035] The accompanying drawings are used to provide a further understanding of the present application, and constitute a part of the specification, and are used to explain the present application together with the embodiments of the present application, and do not constitute a limitation on the present application. In the drawings:

[0036] Figure 1 The overall structural diagram of the aerosol inkjet printing device provided by the present application is shown.

[0037] Figure 2 The internal structure diagram of the nozzle part of the aerosol inkjet printing device provided by the present application is shown.

[0038] Figure 3 The schematic diagram of the axial movement of the aerosol ink particle flow under the assistance of inline heating in the present application is shown.

[0039] Figure 4 The schematic diagram of the radial movement of the aerosol ink particle flow under the assistance of inline heating in the present application is shown.

[0040] Explanation of reference signs:

[0041] Aerosol printing nozzle 1, nozzle 2, transition pipe 21, ejection channel 22, hot water circulation system 3, spiral circulating water bath flow channel 4, oil-gas mixing part 5, sheath gas channel 51, aerosol ink and carrier gas channel 52. DETAILED DESCRIPTION

[0042] The preferred embodiments of the technical solution will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the technical solution, and are not used to limit the technical solution.

[0043] As shown in Figures 1-2 The aerosol inkjet printing device provided by the present application comprises an aerosol printing nozzle 1 and a hot water circulation system 3. The aerosol printing nozzle 1 is composed of an upper oil-gas mixing part 5 and a lower nozzle 2. The upper end of the nozzle 2 is provided with a transition pipe 21 in communication with the oil-gas mixing part 5. Aerosol ink, carrier gas and sheath gas are input from the oil-gas channel of the oil-gas mixing part 5 and merged into the ejection channel 22 in the center of the transition pipe 21 above the nozzle 2, and then sprayed out from the lower end of the nozzle 2 to realize aerosol inkjet printing. The spiral circulating water bath flow channel 4 is arranged in the side wall of the transition pipe 21. The hot water circulation system 3 can circulate hot water into the spiral circulating water bath flow channel 4, so that the ejection channel 22 in the center of the transition pipe 21 is in a stable annular heat field.

[0044] Specifically, the hot water circulation system 3 comprises a water bath heater and a water bath circulation micro flow pump, the water inlet pipe and the water outlet pipe of the water bath heater are connected to the water inlet and outlet of the spiral circulation water bath flow channel 4 in sequence through the water bath circulation micro flow pump, wherein the water bath heater has heating and heat preservation functions, can control the temperature of the circulating water bath to a specific value, the water bath circulation micro flow pump can set a specific circulation flow rate, and can ensure that the spray channel 22 is in a stable annular thermal field by adjusting the circulation flow rate. The water bath heater has heating and heat preservation functions, and can control the temperature of the circulating water bath to a specific constant value. The water bath circulation micro flow pump can set a specific circulation flow rate. In consideration of the heat transfer (dissipation) of the aerosol ink flow in the thermal field, the heat stability of the inner online thermal field is ensured by adjusting the circulation flow rate.

[0045] Specifically, the oil and gas channel comprises an aerosol ink and carrier gas channel 52 located at the center of the oil and gas mixing part 5 and a sheath gas channel 51 distributed in a reverse conical shape along the inner wall of the oil and gas mixing part 5, and the bottom of the aerosol ink and carrier gas channel 52 and the sheath gas channel 51 is communicated with the upper end of the spray channel 22.

[0046] The aerosol inkjet printing device provided by the application firstly considers the area range of the heat focusing compensation required by the aerosol ink flow, i.e., determines the layout range of the tubular thermal field; secondly, based on the thermal physical properties of the circulating water bath, the nozzle material, the pneumatic flow field and the ink solvent, the heat transfer mechanism of the external heating field can be constructed, and the layout form of the circulating hot water bath spiral flow channel is determined, mainly including the flow channel aperture, the flow channel spacing and the flow channel number.

[0047] The specific structure form of the aerosol printing head 1 provided by the application can be manufactured by a light curing 3D printing forming method and integrated and assembled on a commercial aerosol inkjet printing platform to form an aerosol inkjet printing device with an online heating auxiliary device, so that the aerosol inkjet printing work with online heating assistance can be carried out.

[0048] Based on the structure form of the aerosol inkjet printing device, the application further provides an aerosol inkjet printing deposition efficiency regulation method, comprising the following steps:

[0049] Step 1: According to the deposition requirements of the aerosol inkjet printing, the corresponding single-layer deposition height is obtained, and the deposition distribution aspect ratio is determined by the single-layer deposition height and the deposition line width.

[0050] The deposition requirements specifically include printing accuracy, deposition spacing, deposition line layout and interconnection layer number requirements.

[0051] It should be noted that the deposition distribution aspect ratio is the ratio of the single-layer deposition height to the deposition line width, and the deposition efficiency is directly related to the deposition distribution aspect ratio, so by regulating the deposition distribution aspect ratio, the optimization and regulation of the deposition efficiency can be achieved.

[0052] Step 2: Based on the material properties of the aerosol nano-ink, analyze the distribution characteristics of the gas / liquid flow field under the constraint of the temperature field and the force-motion of the aerosol nano-ink particles in the process of jetting / deposition, and construct a jetting / deposition motion model of the aerosol nano-ink particles under the constraint of the temperature field.

[0053] Among them, the material properties include ink particle size, particle / solvent density, solvent viscosity, etc.

[0054] Specifically, in step 2, in the process of analyzing the force-motion of the aerosol nano-ink particles in the process of jetting / deposition, the force includes the fluid drag force of the solvent and the sheath gas, and the motion includes the velocity of the ink particles in the axial direction of the channel.

[0055] It should be noted that the constraint of the temperature field is specifically that an online heating auxiliary system is arranged on the outer periphery of the jetting channel of the aerosol inkjet printing device, so that the motion process of the aerosol nano-ink is constrained by the external heating condition.

[0056] Specifically, analyzing the distribution characteristics of the gas / liquid flow field under the constraint of the temperature field is a process of simultaneously solving the control equations of laminar compressible flow based on a density-based solver to describe the distribution characteristics of the flow field, so as to more accurately represent the fluid behavior under different conditions. For Newtonian isotropic fluids, these control equations are expressed in general form, including continuity equation, momentum equation, energy equation and state equation, as shown in formulas (1)-(4).

[0057] (1)

[0058] (2)

[0059] (3)

[0060] , (4)

[0061] Among them is the density of the fluid, is the velocity of the liquid, is the pressure of the liquid, is the viscosity of the liquid, is the momentum source term, is the internal specific energy, is the thermal conductivity of the liquid, is the temperature of the liquid, is the dissipation function, is the energy source term, is the universal gas constant, is the heat capacity of the liquid at constant volume.

[0062] Regulating the balance between fluid temperature and density in aerosol inkjet printing, equation (4) is the main constraint for the nozzle on-line heating approach. Specifically, the temperature-induced fluid density change affects the flow field distribution characteristics, thus helping to control the AIP (aerosol ink particle) trajectory of motion governed by the flow field. After analyzing the flow field evolution mechanism in aerosol inkjet printing, simulations were performed to calculate its characteristic distribution. Subsequently, the motion of AIP within the established flow field model was simulated. The trajectory of AIP was predicted by integrating the force balance acting on AIP in shear flow. The motion of spherical AIP through successive phases was determined by applying force balance based on Newton's second law of motion, as shown in equation (5).

[0063] (5)

[0064] where , i.e. drag force, is a form of fluid resistance acting on AIP, opposite to the relative motion between the gas and ink phases, as shown in equation (6). , i.e. Saffman lift, is the lift force acting on AIP passing through shear flow. It is proportional to the shear rate and the relative velocity between the gas phase, as shown in equation (7). , is the gravitational force acting on AIP, as shown in equation (8).

[0065] (6)

[0066] (7)

[0067] (8)

[0068] where , , and are the mass, radius, density and velocity of AIP, respectively. is the kinematic viscosity, is the velocity gradient, is the gravitational acceleration vector.

[0069] Step 3: Based on the jet / deposition motion model obtained in step 2, solve the thermal field temperature value of on-line heating according to the aspect ratio of the deposition distribution obtained in step 1.

[0070] According to the jetting / deposition motion model obtained in step 2, it can be known that the change of the thermal field temperature value T will cause the change of the fluid density, which will further affect the flow field distribution characteristics, and finally affect the AIP (aerosol ink particle) motion trajectory of the flow field control, so according to the control requirement of the AIP motion trajectory (the motion trajectory is the single-layer deposition height and the deposition line width, that is, the deposition distribution aspect ratio), the online heating thermal field temperature value can be reversely solved.

[0071] Step 4: Based on the structure of the aerosol inkjet printing device and the thermal conductivity characteristics of the materials thereof, and considering the thermal circulation flow rate, the heat transfer mechanism of the online heating is constructed.

[0072] Step 5: Based on the heat transfer mechanism and the thermal field temperature value obtained in step 3, the heating temperature of the water bath heating end and the thermal circulation flow rate are determined.

[0073] Since the heating temperature of the water bath heating end is not equal to the actual heating temperature (thermal field temperature value) received by the aerosol nano-ink particles, the two will be affected by the thermal circulation flow rate and the material thermal conductivity characteristics of the nozzle itself during the conversion process, and the material thermal conductivity characteristics of the nozzle itself is the inherent parameter of the material, so by constructing the relationship between the heating temperature of the water bath heating end and the thermal circulation flow rate, the material thermal conductivity characteristics and the thermal field temperature value obtained in step 2, that is, constructing the heat transfer mechanism of the online heating, the heating temperature of the water bath heating end and the thermal circulation flow rate can be obtained according to the thermal field temperature value.

[0074] Step 6: According to the heating temperature of the water bath heating end and the thermal circulation flow rate obtained in step 5, the output temperature of the heating end and the circulation pump flow rate are adjusted in real time to realize the online heating assisted aerosol inkjet printing, and the axial-radial thermal auxiliary focusing of the aerosol ink flow is realized, as shown in Figure 3 and Figure 4 , and finally the regulation and control of the aerosol inkjet deposition efficiency are realized.

[0075] The present application adopts the way of adding an annular thermal field to the aerosol ink flow jetting channel, changes the density of the gas-liquid phase flow field of the aerosol inkjet system, adjusts the characteristic distribution of the high Reynolds number flow field, and then axially focuses the aerosol ink particles. Based on heat transfer / distribution, computational fluid dynamics and particle dynamics, the temperature field characteristic distribution model of the aerosol inkjet system and the aerosol nano-ink particle focusing motion model are established respectively; the thermal field distribution characteristics of a specific ink under a specific deposition characteristic requirement are calculated through numerical simulation, and then the online thermal field input parameters (temperature value and thermal circulation rate) are determined; the online thermal field obtained by the above calculation and analysis is constructed for the aerosol ink flow jetting environment, the longitudinal distribution density of the aerosol ink deposition is improved, and finally the reliable optimization and regulation and control of the aerosol inkjet printing deposition efficiency (deposition distribution aspect ratio) are realized.

[0076] The present application realizes radial quantitative focusing of full coverage of the horizontal level of aerosol jet printing ink particles by the method of thermal particle manipulation, improves the longitudinal distribution density and deposition aspect ratio of aerosol ink deposition, and realizes reliable and effective optimization and control of the deposition efficiency of aerosol inkjet printing.

[0077] Obviously, those skilled in the art can make various modifications and variations to the present technical solution without departing from the spirit and scope of the present technical solution. Thus, if these modifications and variations of the present technical solution fall within the scope of the claims of the present technical solution and their equivalents, the present technical solution also intends to include these modifications and variations.

Claims

1. A method for controlling deposition efficiency of aerosol inkjet printing, characterized in that: The steps include: Step 1: according to the deposition requirements of aerosol printing, the corresponding single-layer deposition height is obtained, and the deposition distribution aspect ratio is determined by the single-layer deposition height and the deposition line width; Step 2: Based on the material properties of the aerosol nano-ink, the characteristic distribution of the gas / liquid flow field under the temperature field constraint and the force-motion of the aerosol nano-ink particles during the spraying / deposition process are analyzed to construct a spraying / deposition motion model of the aerosol nano-ink particles under the temperature field constraint; Step 3: Based on the injection / deposition motion model obtained in step 2 and the deposition distribution aspect ratio obtained in step 1, the thermal field temperature value of the online heating is solved; Step 4, based on the structural form of the aerosol inkjet printing device and the thermal conductivity characteristics of its materials, and taking into account the heat circulation flow rate, a heat transfer mechanism for inline heating is constructed; wherein, the aerosol inkjet printing device comprises: an aerosol printing nozzle (1) and a hot water circulation system (3), the aerosol printing nozzle (1) consists of an upper oil-gas mixing part (5) and a lower nozzle (2), and the upper end of the nozzle (2) is provided with a transition pipe (21) connected to the oil-gas mixing part (5); aerosol ink, carrier gas The sheath gas is input from the oil and gas channel of the oil and gas mixing section (5) and merged into the injection channel (22) at the center of the transition pipe (21) above the nozzle (2) and then ejected from the lower end of the nozzle (2), thereby realizing aerosol inkjet printing; a spiral circulating water bath flow channel (4) is provided inside the side wall of the transition pipe (21), and the hot water circulation system (3) can flow circulating hot water into the spiral circulating water bath flow channel (4), so that the injection channel (22) at the center of the transition pipe (21) is in a stable annular thermal field; Step 5: Based on the heat transfer mechanism and the thermal field temperature value obtained in step 3, the heating temperature and thermal circulation flow rate of the water bath heating end are determined; Step 6: Based on the heating temperature and heat circulation flow rate of the water bath heating end obtained in step 5, the output temperature of the heating end and the circulation pump flow rate are adjusted in real time to achieve online heating-assisted aerosol inkjet printing, and ultimately achieve regulation of the aerosol printing deposition efficiency.

2. The method for controlling deposition efficiency of aerosol inkjet printing according to claim 1, wherein: The deposition requirements specifically include printing accuracy, deposition spacing, deposition line layout, and number of interconnection layers.

3. The method for controlling deposition efficiency of aerosol inkjet printing according to claim 1, wherein: The material properties include ink particle size, particle / solvent density, and solvent viscosity.

4. The method for controlling deposition efficiency of aerosol inkjet printing according to claim 1, wherein: In step 2, during the analysis of the force-motion conditions of the aerosol nano-ink particles during the spraying / deposition process, the force includes the fluid drag of the solvent and sheath gas, and the motion includes the velocity of the ink particles in the channel axis.

5. The method for controlling deposition efficiency of aerosol inkjet printing according to claim 1, wherein: The temperature field constraint is specifically: an online heating auxiliary system is provided on the periphery of the jetting channel of the aerosol inkjet printing device, so that the movement process of the aerosol nano ink is constrained by external heating conditions.

6. An aerosol inkjet printing device, characterized in that: It is used to implement the aerosol inkjet printing deposition efficiency control method according to any one of claims 1 to 5, the printing device comprising: an aerosol printing nozzle (1) and a hot water circulation system (3), the aerosol printing nozzle (1) consisting of an upper oil-gas mixing part (5) and a lower nozzle (2), the upper end of the nozzle (2) being provided with a transition pipe (21) communicating with the oil-gas mixing part (5); Aerosol ink, carrier gas and sheath gas are input from the oil and gas channel of the oil and gas mixing section (5) and merged into the injection channel (22) at the center of the transition pipe (21) above the nozzle (2) and then ejected from the lower end of the nozzle (2), thereby realizing aerosol inkjet printing; A spiral circulating water bath flow channel (4) is provided inside the side wall of the transition pipe (21), and the hot water circulation system (3) can flow circulating hot water into the spiral circulating water bath flow channel (4), so that the central injection channel (22) of the transition pipe (21) is in a stable annular thermal field.

7. The aerosol inkjet printing device according to claim 6, wherein: The hot water circulation system (3) includes a water bath heater and a water bath circulation micro-flow pump, wherein the water inlet pipe and the water outlet pipe of the water bath heater are respectively connected to the water inlet and outlet of the water bath circulation micro-flow pump and the spiral circulation water bath flow channel (4) in sequence, wherein the water bath heater has heating and heat preservation functions and can control the temperature of the circulating water bath to a specific value, and the water bath circulation micro-flow pump can set a specific circulation flow rate and can ensure that the injection channel (22) is in a stable annular thermal field by adjusting the circulation flow rate.

8. The aerosol inkjet printing device according to claim 7, wherein: The oil-gas channel comprises an aerosol ink and carrier gas channel (52) located at the center of the oil-gas mixing section (5) and a circle of sheath gas channels (51) distributed in an inverted cone shape along the inner circumference of the side wall of the oil-gas mixing section (5). The aerosol ink and carrier gas channel (52) and the sheath gas channel (51) are connected to the upper end of the injection channel (22) after merging at the bottom.

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