CN113580565A

CN113580565A - Electric jet printing method for pre-printed functional layer induced jet flow

Info

Publication number: CN113580565A
Application number: CN202110769995.8A
Authority: CN
Inventors: 李凯; 任鑫磊; 王晓英; 张方圆
Original assignee: Ningbo University
Current assignee: Ningbo University
Priority date: 2021-07-04
Filing date: 2021-07-04
Publication date: 2021-11-02

Abstract

The invention belongs to the technical field of advanced manufacturing, and relates to an electronic jet printing method for jet flow induced by a preprinting functional layer. The electronic jet printing method adopts the preprinted functional layer to change the distribution condition of the electric field force of the substrate, ensures the jet flow deposition position precision, reduces the process size error of the composite micro-nano functional structure, has the advantages of low equipment cost, simple process, short processing period and the like, optimizes the micro-nano functional structure, improves the service performance of a nano device and prolongs the service life of the nano device.

Description

Electric jet printing method for pre-printed functional layer induced jet flow

Technical Field

The invention belongs to the technical field of advanced manufacturing, and relates to an electronic jet printing method for preprinting functional layer induced jet flow.

Background

The electro-jet printing is a non-contact additive manufacturing technology, functional ink is supplied to an outlet of a nozzle needle by utilizing fluid pressure to form an initial hanging drop, then high voltage is applied between the nozzle needle and a substrate, at the moment, the hanging drop forms a Taylor cone under the comprehensive actions of electric field force, ink surface tension, gravity, viscous force and the like, and when the electric field force is continuously increased, liquid drops are ejected from the tip of the Taylor cone to form stable micro-nano jet flow. The electro-jet printing has the advantages of high processing precision, high material utilization rate, simple process, strong printing controllability and the like, is widely applied to the manufacturing process of flexible display and micro-nano sensors, and becomes a research hotspot in the field of micro-nano manufacturing.

However, in the process of electrojet printing, jet flow is subjected to the comprehensive action of fluid pressure, electric field force, liquid surface tension and the like, jet flow flight is difficult to control, and for a micro-nano functional structure for jet printing complex patterns, the problems of large structural size error, low jet flow deposition position precision and the like exist.

Disclosure of Invention

In order to overcome the defects of the electric spraying printing manufacturing technology, the invention provides an electric spraying printing method for inducing jet flow by a preprinting functional layer. Firstly, jet flow ejected based on an electrohydrodynamic effect preprints complex micro-nano functional structure layer patterns on a substrate, then induces jet flow size and jet flow deposition positions under the action of an electric field force, double spray heads jointly coordinate jet printing, jet printing manufacturing in the same shape as a preprinted functional layer is rapidly realized, and the preprinted functional layer is fully bonded and solidified with subsequent continuous jet flow in a nano scale to form a composite micro-nano functional structure. The electric jet printing method for the preprinted functional layer induced jet flow has the advantages of low equipment cost, simple process, short processing period and the like.

The technical scheme adopted by the invention is as follows:

an electric jet printing method for inducing jet flow by a preprinting functional layer comprises the steps of preparing a micro-nano functional structure preprinting layer with complex patterns on a substrate by utilizing an electric jet printing technology, preprinting a wiring antenna, changing the electric field force distribution condition on the substrate, inducing the jet flow size and the jet flow deposition position in the processing process, and realizing the combined coordinated jet printing of double nozzles, thereby quickly realizing the preparation of a composite micro-nano functional structure. The used electronic jet printing device comprises a jet printing module, a visual detection module and an adsorption module; the jet printing module is characterized by comprising a first injector, a piston, an injector outer cylinder, a reset spring, a rubber guide pipe, a first injection pump, a second injector, a second injection pump, an upper computer, a platform substrate, an infrared heating lamp, preprinting functional ink, a voltage controller, a first spray head clamp, a second spray head and a second spray head clamp; the first syringe and the second syringe are composed of pistons, syringe outer cylinders and return springs with the same specification; the pistons of the first injector and the second injector are respectively fastened on the first injection pump and the second injection pump; the first injector and the second injector are communicated through a rubber catheter cavity; the preprinted functional ink and the functional ink enter the first injector and the second injector under the action of the pressure of the first injection pump and the second injection pump and the action of a return spring; one end of the first injector and one end of the second injector are respectively connected with the upper ends of the first spray head and the second spray head through plastic guide pipes; the front ends of the first spray head and the second spray head clamp are conductive and clamp the first spray head and the second spray head, and the rear ends of the first spray head and the second spray head clamp are insulated and connected with an upper computer to realize three-dimensional motion in space; the first spray head and the second spray head are made of conductive materials, and the head is provided with spray holes; the voltage controller is connected with an alternating current power supply, and the output end of the voltage controller is connected with the right ends of the conductive parts of the first spray head clamp and the second spray head clamp; the infrared heating lamp is connected with a direct-current power supply and is powered by the direct-current power supply, and the lamp body is placed above the platform substrate, so that the lamp light irradiates the whole spray printing surface area and heats the upper surface of the spray printing material; the upper computer respectively controls the movement track and the movement speed of the first spray head clamp and the second spray head clamp, so that the first spray head and the second spray head act in space according to an expected planned route, and the complex micro-nano functional structure is spray-printed;

the visual detection module comprises an industrial camera, a substrate and real-time detection software; the industrial camera monitors the spray printing process on the substrate in real time, transmits an image to an upper computer, and the upper computer processes the image, controls the first spray head clamp and the second spray head clamp to act, and realizes closed-loop connection of the whole spray printing process; the infrared heating lamp not only heats the spray printing process, but also plays a role in illumination;

the adsorption module comprises a platform, a platform substrate and an adsorption device; the platform base plate is fixed on the platform to form a whole, the platform base plate is fixed on the ground through the adsorption device, the relative spatial position is constant all the time, the flatness of the upper surface of the platform base plate is 2-8 micrometers, and the adsorption device accurately fixes the substrate.

An electronic jet printing method for preprinting functional layer induced jet flow comprises the following steps:

first, substrate fixing and initial image acquisition

Firstly, turning on an infrared heating lamp and a switch of an adsorption device, simultaneously placing a substrate at a proper position on a platform base plate, adjusting initial positions of a first nozzle and a second nozzle to an original point of coordinates by an upper computer, carrying out image acquisition on the substrate by an industrial camera and carrying out comparative analysis on a planned route image, and adjusting the printing speed and the initial position height of the first nozzle and the second nozzle;

second, formation of a stable electric jet

Selecting two kinds of high-performance functional ink, injecting the functional ink into the first nozzle and the second nozzle through an injection pump, adjusting the distance between the jet orifice and the substrate, adjusting the output current, the pulse voltage and the frequency of the voltage controller, observing the jet state by using an industrial camera, and finally enabling the functional ink at the jet orifice to form stable jet far smaller than the size of the jet orifice;

thirdly, spray printing manufacturing of the composite micro-nano functional structure

Writing a motion control program according to the shape of the micro-nano functional structure, firstly controlling a first spray head fixture to act by an upper computer, preprinting a complex micro-nano functional layer pattern on a substrate, simultaneously spraying and printing a contact connected with a ground wire, changing the distribution of the electric field force of the substrate, inducing the jet size and the jet deposition position under the action of the electric field force, then controlling a second spray head fixture to act by the upper computer, simultaneously working by double spray heads to accelerate the spray printing speed, realizing the spray printing manufacture with the same shape as the preprinted complex micro-nano functional layer, monitoring the spray printing process of the complex micro-nano functional structure by an industrial camera and real-time monitoring software, and ensuring the stability of jet;

fourthly, curing and forming of the micro-nano functional structure under the assistance of the thermal field

And (3) curing the functional ink in the jet printing process by heating an infrared heating lamp, printing a complex micro-nano functional structure pattern, and meanwhile, adjusting the power of the infrared heating lamp to quickly cure and mold the jet printed structure on the substrate to obtain the composite micro-nano functional structure, wherein the area under the jet flow and being printed is in the irradiation heating range of the infrared heating lamp.

The invention has the beneficial effects that: the jet flow ejected based on the electrohydrodynamic effect preprints complex micro-nano functional structure layer patterns on a substrate, then induces the jet flow size and the jet flow deposition position under the action of an electric field force, and performs combined coordinated jet printing by double nozzles, thereby quickly realizing jet printing manufacture with the same shape as the preprinted functional layer, and the preprinted functional layer is fully bonded and solidified with the continuous jet flow of the follow-up nano scale to form the composite micro-nano functional structure. The electric jet printing method for the preprinted functional layer induced jet flow has the advantages of low equipment cost, simple process, short processing period and the like.

Description of the drawings:

FIG. 1 is a schematic view of an electrospray device with jet-induced preprinted functional layer according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of a jet printing composite micro-nano functional structure in the embodiment of the invention.

Fig. 3 is a cross-sectional view of a syringe in an embodiment of the present invention.

In the figure: the device comprises a first injector 1, a piston 111, an injector outer cylinder 112, a return spring 113, a rubber guide tube 114, a first injection pump 2, a second injector 3, a second injection pump 4, an industrial camera 5, an upper computer 6, a platform 7, a platform base plate 8, a substrate 9, an adsorption device 10, an infrared heating lamp 11, functional ink preprinting 12, functional ink 13, a second spray head 14, a second spray hole 141, a second spray head clamp 15, a voltage controller 16, a first spray head 17, a first spray hole 171 and a first spray head clamp 18.

Detailed Description

The following detailed description of the embodiments of the invention refers to the accompanying drawings. See fig. 1-3.

The embodiment discloses an electronic jet printing method for inducing jet flow by a preprinting functional layer, which is realized by utilizing an electronic jet printing device for inducing jet flow by the preprinting functional layer, wherein the device comprises a jet printing module, a visual detection module and an adsorption module. The device is used for preprinting complex micro-nano functional structure layer patterns on a substrate by utilizing an electric jet printing technology, preprinting a wiring antenna, changing the distribution condition of electric field force on the substrate, adjusting printing parameters to obtain nanoscale high-viscosity continuous jet flow far smaller than the inner diameter of a spray needle, wherein the jet flow has high-precision process size and deposition position precision under the induction of the electric field force, the high-viscosity continuous jet flow is fully bonded and solidified with the preprinting micro-nano functional structure layer, and the double spray heads are used for jointly and coordinately spray printing to quickly realize the preparation of the required composite micro-nano functional structure.

Specifically, in the present embodiment, the inkjet printing module includes a first syringe 1, a first syringe pump 2, a second syringe 3, a second syringe pump 4, an infrared heating lamp 11, pre-printed functional ink 12, functional ink 13, a first nozzle 17, a first nozzle holder 18, a second nozzle 14, and a second nozzle holder 15; the first injection pump 2 and the second injection pump 4 are powered by a 220V alternating current power supply, and the first injector 1 and the second injector 3 are composed of pistons 111, injector outer cylinders 112 and return springs 113 with the same specification; the pistons 111 of the first syringe 1 and the second syringe 3 are respectively fastened on the first syringe pump 2 and the second syringe pump 4; the first injector 1 and the second injector 4 are communicated through a rubber conduit 114 cavity; the preprinted functional ink 12 and functional ink 13 enter the first injector 1 and the second injector 3 under the pressure of the first injection pump 2 and the second injection pump 4 and the action of a return spring 113; one ends of the first injector 1 and the second injector 3 are respectively connected with the upper ends of the first spray head 17 and the second spray head 14 through plastic conduits; the front ends of the first spray head clamp 18 and the second spray head clamp 15 are conductive and clamp the first spray head 17 and the second spray head 14, the rear ends are insulated and connected with the upper computer 6,spatially implementing three-dimensional motion O_xyz(ii) a The first spray head 17 and the second spray head 14 are made of conductive materials, and the head parts are provided with a first spray hole 171 and a second spray hole 141; the voltage controller 16 is connected with a 220V alternating current power supply, and the output end of the voltage controller is connected with the right ends of the conductive parts of the first spray head clamp 18 and the second spray head clamp 15; the infrared heating lamp 11 is connected with a 0-30V direct current power supply and is powered by the 0-30V direct current power supply, and a lamp body is arranged above the platform substrate 8, so that the lamp light irradiates the whole spray printing surface area and heats the upper surface of the spray printing material; the upper computer 6 respectively controls the movement tracks and the movement speeds of the first spray head clamp 18 and the second spray head clamp 15, so that the first spray head 17 and the second spray head 14 act according to an expected planned route in space, and the complex micro-nano functional structure is sprayed and printed;

specifically, in the present embodiment, the visual inspection module includes the industrial camera 5, the substrate 9, and real-time inspection software; the industrial camera 5 monitors the spray printing process on the substrate 9 in real time, transmits the image to the upper computer 6, and the upper computer 6 processes the image, controls the first spray head clamp 18 and the second spray head clamp 15 to act, and realizes the closed-loop connection of the whole spray printing process; the infrared heating lamp 11 not only heats the spray printing process, but also has the illumination function;

specifically, in the present embodiment, the adsorption module includes a stage 7, a stage substrate 8, and an adsorption device 10; the platform base plate 8 is fixed on the platform 7 to form a whole, and is fixed on the ground through the adsorption device 10, the relative spatial position is constant all the time, the flatness of the upper surface of the platform base plate 8 is 2-8 micrometers, and the adsorption device 10 accurately fixes the substrate 9.

In order to achieve the purpose, the invention adopts the technical scheme that:

the device is adopted to carry out the jet-induced electro-jet printing of the preprinting functional layer, and the specific steps are as follows:

first, substrate fixing and initial image acquisition

First, the infrared heating lamp 11 and the adsorption device 10 are turned on and off, and the substrate 9 is placed on the stage base plate 8 at a proper position, and then the upper machine 6 initially places the first shower head 17 and the second shower head 14Adjusting the initial position to the origin of coordinates O_xyThe initial printing speed v of the first spray head 17 and the second spray head 14 is adjusted by the industrial camera 5 to acquire the images of the substrate 9 and compare the images of the planned route_oAnd an initial position height h_o；

Second, formation of a stable electric jet

Selecting two high-performance nano-silver functional inks, wherein the surface tension of the two high-performance nano-silver functional inks is 40mN/m-90mN/m, the viscosity of the two high-performance nano-silver functional inks is 2cP-8cP, injecting preprinted functional ink 12 and functional ink 13 into a first spray head 17 and a second spray head 14 through a first injection pump 2 and a second injection pump 4, setting the flow rate of the functional ink to be 2.5 mu l/min-5 mu l/min, adjusting the distance between a first spray hole 171 and a substrate and a second spray hole 141 to be 4mm-12mm, adjusting a voltage controller 16 to output alternating-current pulse voltage with the frequency of 20Hz-100Hz and the high voltage of 1000V, observing the jet state by using an industrial camera 5, and finally enabling the functional ink at the spray holes to form stable jet flows which are far smaller than the sizes of the first spray hole 171 and the second spray hole 141;

According to the shape of the micro-nano functional structure, a motion control program is compiled, firstly, an upper computer 6 controls a first spray head clamp 18 to act, the motion speed is 2mm/s-6mm/s, a complex micro-nano functional layer pattern is preprinted on a substrate 9, meanwhile, a contact connected with a ground wire is spray-printed, the distribution condition of the electric field force of the substrate 9 is changed, the jet flow size and the jet flow deposition position are induced under the action of the electric field force, next, the upper computer 6 controls a second spray head clamp 15 to act, the motion speed is 4mm/s-9mm/s, double spray heads are combined to carry out spray printing in a coordinated mode, spray printing manufacturing with the same shape as the preprinted complex micro-nano functional layer is rapidly achieved, the spray printing process of the composite micro-nano functional structure is monitored through an industrial camera 5 and real-time monitoring software, and the stability of the jet flow is guaranteed;

And (3) curing the functional ink in the jet printing process by heating the infrared heating lamp 11, printing the complex micro-nano functional structure pattern, meanwhile, adjusting the power of the infrared heating lamp 11 to be 240W-380W when the printing area below the jet flow is in the irradiation heating range of the infrared heating lamp 11, and rapidly curing and molding the structure jet printed on the substrate 9 to obtain the required composite micro-nano functional structure.

Claims

1. An electronic jet printing method for pre-printing functional layer induced jet flow is characterized in that an electronic jet printing device comprises a jet printing module, a visual detection module and an adsorption module; the jet printing module is characterized by comprising a first injector (1), a piston (111), an injector outer cylinder (112), a reset spring (113), a rubber guide pipe (114), a first injection pump (2), a second injector (3), a second injection pump (4), an upper computer (6), a platform substrate (8), an infrared heating lamp (11), preprinted functional ink (12), functional ink (13), a voltage controller (16), a first nozzle (17), a first nozzle clamp (18), a second nozzle (14) and a second nozzle clamp (15); the first syringe (1) and the second syringe (3) are composed of pistons (111), syringe outer cylinders (112) and return springs (113) with the same specification; the pistons (111) of the first syringe (1) and the second syringe (3) are respectively fastened on the first injection pump (2) and the second injection pump (4); the first injector (1) and the second injector (3) are communicated through a cavity of a rubber conduit (114); the preprinted functional ink (12) and the functional ink (13) enter the first injector (1) and the second injector (3) under the pressure of the first injection pump (2) and the second injection pump (4) and the action of a return spring (113); one ends of the first injector (1) and the second injector (3) are respectively connected with the upper ends of the first spray head (17) and the second spray head (14) through plastic guide pipes; the front ends of the first spray head clamp (18) and the second spray head clamp (15) are conductive and clamp the first spray head (17) and the second spray head (14), and the rear end insulation part is connected with the upper computer (6) to realize three-dimensional motion in space; the first spray head (17) and the second spray head (14) are made of conductive materials, and the head parts are provided with a first spray hole (171) and a second spray hole (141); the voltage controller (16) is connected with an alternating current power supply, and the output end of the voltage controller is connected with the right ends of the conductive parts of the first spray head clamp (18) and the second spray head clamp (15); the infrared heating lamp (11) is connected with a direct-current power supply and is powered by the direct-current power supply, and a lamp body is arranged above the platform substrate (8) to enable light to irradiate the whole jet printing surface area and heat the upper surface of a jet printing material; the upper computer (6) respectively controls the movement track and the movement speed of the first spray head clamp (18) and the second spray head clamp (15), so that the first spray head (17) and the second spray head (14) act in space according to an expected planned route, and complex micro-nano functional structures are sprayed and printed;

the visual detection module comprises an industrial camera (5), a substrate (9) and real-time detection software; the industrial camera (5) monitors the spray printing process on the substrate (9) in real time, transmits the image to the upper computer (6), the upper computer (6) processes the image, and controls the first spray head clamp (18) and the second spray head clamp (15) to act, so that the closed-loop connection of the whole spray printing process is realized; the infrared heating lamp (11) not only heats the jet printing process, but also plays a role in illumination;

the adsorption module comprises a platform (7), a platform substrate (8) and an adsorption device (10); the platform substrate (8) is fixed on the platform (7) to form a whole and is fixed on the ground through the adsorption device (10), and the relative spatial position is always unchanged; the adsorption device (10) accurately fixes the substrate (9).

2. Electrojet printing of a preprinted functional layer induced jet using the device of claim 1, characterized by the following steps:

first, substrate fixing and initial image acquisition

Firstly, turning on switches of an infrared heating lamp (11) and an adsorption device (10), simultaneously placing a substrate (9) at a proper position on a platform substrate (8), adjusting initial positions of a first spray head (17) and a second spray head (14) to a coordinate origin point through an upper computer (6), carrying out image acquisition on the substrate (9) through an industrial camera (5), carrying out comparative analysis on a planned route image, and adjusting initial printing speeds and initial position heights of the first spray head (17) and the second spray head (14);

second, formation of a stable electric jet

Selecting two kinds of functional ink, injecting preprinted functional ink (12) and functional ink (13) into a first spray head (17) and a second spray head (14) through a first injection pump (2) and a second injection pump (4), adjusting the distance between a first spray hole (171) and a second spray hole (141) and a substrate, adjusting the voltage and frequency output by a voltage controller (16), observing the state of jet flow by using an industrial camera (5), and finally enabling the functional ink at the spray hole to form stable jet flow with the size far smaller than that of the first spray hole (171) and that of the second spray hole (141);

According to the shape of a micro-nano functional structure, a motion control program is compiled, firstly, an upper computer (6) controls a first spray head clamp (18) to act, a complex micro-nano functional layer pattern is preprinted on a substrate (9), meanwhile, a contact connected with a ground wire is sprayed and printed, the electric field force distribution of the substrate (9) is changed, the jet flow size and the jet flow deposition position are induced under the action of the electric field force, then, the upper computer (6) controls a second spray head clamp (15) to act, the double spray heads work simultaneously to accelerate the spray printing speed, the spray printing manufacture with the same shape as the preprinted complex micro-nano functional layer is realized, the spray printing process is monitored through an industrial camera (5) and real-time monitoring software, and the stability of the jet flow is ensured;

The preprinted functional ink (12) and the functional ink (13) are cured by an infrared heating lamp (11) for heating in the jet printing process, and when a complex micro-nano functional structure pattern is printed, the area under the jet flow and being printed is positioned in the irradiation heating range of the infrared heating lamp (11), the power of the infrared heating lamp (11) is adjusted, so that the structure jet printed on the substrate (9) is rapidly cured and formed, and the required composite micro-nano functional structure is obtained.