KR20150136763A - 3-dimentional printing apparatus using electrohydrodynamic phenomena and printing method using the same - Google Patents

Abstract

A 3D printing apparatus using an electrohydrodynamic phenomenon comprises: a nozzle which contains ink including particles and a solvent, discharges the ink on an insulating substrate using the electrohydrodynamic phenomenon, and forms a 3D structure with the particles on the insulating substrate as the solvent is evaporated from the ink; a conductive substrate arranged in a lower portion of the insulating substrate to support the insulating substrate; and the power electrically connected to the nozzle, and applying voltage to the nozzle to produce the electrohydrodynamic phenomenon. The power has one side terminal electrically connected to the nozzle to apply the voltage, and has the other side terminal which is grounded. The conductive substrate is grounded. The nozzle has the diameter in a range of 0.5 to 10 μm. The power applies the voltage of 150 to 500 V to the nozzle. A separated space between the nozzle and the insulating substrate is 5 to 200 μm. A steam pressure of the ink solvent is 0.01 to 127 mmHg at 25°C. Accordingly, the apparatus of the present invention can easily form the 3D structure which a user wants using the electrohydrodynamic phenomenon under the optimal process condition.

Description

[0001] The present invention relates to a 3D printing apparatus using an electrohydraulic phenomenon and a printing method using the same,

TECHNICAL FIELD The present invention relates to a printing apparatus using electrohydrodynamic (EHD), and more particularly, to a printing apparatus using an electrohydrodynamic (EHD) And a printing method using the same.

BACKGROUND ART [0002] Various printer devices for printing characters, drawings, and the like on a print object such as paper have been known in the past. Conventional printers generally have a type in which printing is performed while scanning the paper or sheet material to be printed in a predetermined direction while moving the printer head at a right angle to the conveying direction.

Such a conventional printer apparatus is to perform two-dimensional printing by performing predetermined printing on a flat sheet or a flat surface of a solid material, but recently, a three-dimensional surface (e.g., cylindrical surface, spherical surface, There is a demand for a printer capable of printing on an object having a curved surface or the like.

In order to meet such a need, researches on a 3D printing apparatus that realizes fine printing using an electrohydraulic phenomenon are under way. However, 3D printing using electrohydraulic phenomenon has a problem that it is difficult to set optimized process conditions for forming a three-dimensional structure.

Korean Patent Publication No. 10-2008-0041095

The present invention provides a 3D printing apparatus and a printing method using the 3D printing apparatus which are easy to form a three-dimensional structure by using an electrohydraulic phenomenon under optimum process conditions.

The present invention relates to an inkjet recording method comprising the steps of: receiving an ink containing particles and a solvent; discharging the ink onto an insulating substrate using electrohydraulic phenomenon, A conductive substrate disposed below the insulating substrate to support the insulating substrate, and a power source electrically connected to the nozzle and adapted to apply a voltage to the nozzle to generate the electrohydraulic phenomenon, Wherein the power source has a terminal electrically connected to apply a voltage to the nozzle and a grounded second terminal, the conductive substrate is grounded, and the nozzle has a diameter in the range of 0.5 탆 to 10 탆 Wherein the power source applies a voltage in the range of 150 V to 500 V to the nozzle, Separation distance between has a range of 5 ㎛ to 200 ㎛, the vapor pressure of the solvent ink provides a 3D printing apparatus using a 0.01 mmHg to about 127 mmHg range the electro-hydraulic phenomenon at 25 ℃.

According to another aspect of the present invention, there is provided a method of manufacturing an electro-optical device, comprising: positioning an insulating substrate having a grounded conductive substrate on a lower side of the nozzle; And forming a three-dimensional structure on the insulating substrate by ejecting ink containing particles and a solvent from the nozzle using the electro-hydrodynamic phenomenon, wherein the power source applies a voltage And the other terminal being grounded, the nozzle having a diameter in the range of 0.5 [mu] m to 10 [mu] m, the power source applying a voltage in the range of 150 V to 500 V to the nozzle , The spacing distance between the nozzle and the insulating substrate is in the range of 5 [mu] m to 200 [mu] m, and the vapor pressure for the solvent is 0.01 mm Lt; RTI ID = 0.0 > Hg < / RTI > to 127 mmHg.

According to another aspect of the present invention, there is provided a method of manufacturing an inkjet printhead, comprising: receiving ink containing particles and a solvent; discharging the ink onto a conductive substrate using electrohydraulic phenomenon, A nozzle configured to form a three-dimensional structure on the substrate with the particles; and a power source electrically connected to the nozzle, the power source applying a voltage to the nozzle to generate the electrohydraulic phenomenon, Wherein the conductive substrate is grounded, the nozzle has a diameter in the range of 0.5 탆 to 10 탆, and the power source has a voltage of 150 V to 200 V, A voltage in the range of 500 to 500 V is applied to the nozzle, and a spacing distance between the nozzle and the conductive substrate is in the range of 5 to 200 mu m , The vapor pressure of the solvent ink provides a 3D printing apparatus using a 0.01 mmHg to about 127 mmHg range the electro-hydraulic phenomenon at 25 ℃.

According to another aspect of the present invention, there is provided a method of manufacturing a semiconductor device, comprising: positioning a grounded conductive substrate below a nozzle; applying a voltage from the power source to the nozzle such that electro- And forming a three-dimensional structure on the conductive substrate by ejecting ink containing particles and a solvent using the electrohydraulic phenomenon, wherein the power source is electrically connected to apply voltage to the nozzle Wherein the power supply has a voltage in the range of 150 V to 500 V applied to the nozzle and the voltage applied to the nozzle and the conductive < RTI ID = 0.0 > The spacing distance between the substrates is in the range of 5 탆 to 200 탆, and the vapor pressure for the solvent ranges from 0.01 mmHg to 127 mmHg at 25 캜. It provides 3D printing method using the force phenomena.

The 3D printing apparatus and the printing method using the electrohydraulic phenomenon according to the present invention have the following effects.

First, printing can be performed on an object having a three-dimensional surface (e.g., a cylindrical surface, a spherical surface, or various other surfaces).

Secondly, it is possible to easily form a three-dimensional structure desired by a user by using an electrohydraulic phenomenon on an optimum process condition.

1 is a schematic diagram showing a 3D printing apparatus using an electrohydraulic phenomenon according to an embodiment of the present invention.
Figs. 2 and 3 are graphs showing waveforms of alternating voltage used in the 3D printing apparatus shown in Fig. 1. Fig.
4 is a flowchart illustrating a printing method using the 3D printing apparatus shown in FIG. 1 of the present invention.
FIG. 5 is a photograph of a structure formed using the 3D printing method shown in FIG. 4 in comparison with a comparative example.
6 is a schematic view showing a 3D printing apparatus using an electrohydraulic phenomenon according to another embodiment of the present invention.
7 is a flowchart illustrating a printing method using the 3D printing apparatus shown in FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1, a 3D printing apparatus 100 (hereinafter referred to as a printing apparatus) according to an embodiment of the present invention is shown.

Referring to FIG. 1, the printing apparatus 100 includes a nozzle 130, an AC power source 140, and a conductive substrate 150. The nozzle 130 receives ink containing particles and a solvent, and discharges the ink to the insulating substrate 120 using an electrohydraulic phenomenon.

When the inner diameter of the nozzle 130 is less than 0.5 탆, ink is not ejected due to clogging. If the inner diameter of the nozzle 130 is more than 10 μm, the amount of ink to be printed on the nozzle 130 is large and 3D printing is impossible.

The nozzle 130 has a basic structure of a micropipette made of glass, and its side and end are covered with a metal film. The metal film is formed of a material including gold, silver, platinum, copper, aluminum, or an alloy thereof.

The ink forms a three-dimensional structure with particles (e.g., silver, cobalt, etc.) remaining on the insulating substrate 120 while the solvent evaporates. The vapor pressure for the solvent is in the range of 0.01 mmHg to 127 mmHg at 25 ° C, and the temperature of the insulating substrate 120 is set in the range of 10 ° C to 150 ° C.

Examples of the solvent include N-methylpyrrolidone, Ortho di-Chlorobenzene, ethanol and the like. The vapor pressure parameter for the solvent is 0.29 mmHg1 of enemethylpyrrolidone 47 mmHg of orthodichlorobenzene, and 59.02 mmHg of ethanol. When the vapor pressure of the solvent is lower than 0.01 mmHg (vapor pressure lower than tetradecane), the volatility of the solvent becomes very small.

The principle of 3D printing is that the particles are stacked as the solvent is rapidly volatilized. In this case, the volatilization of the solvent becomes difficult and the solvent droplets of another liquid state are stacked on the solvent droplets in the liquid state, . (Eg, glycerin, (~ 0.0001 mmHg at 25 ° C)

When the vapor pressure for the solvent is higher than 127 mmHg (vapor pressure higher than methanol), the volatility of the solvent becomes very large. If the nozzle 130 is excessively volatile, the solvent is volatilized in the nozzle 130 during printing and the nozzle 130 is clogged. (E.g., acetone, (226 mmHg at 25 < 0 > C))

When the temperature of the insulating substrate 120 is less than 10 ° C, the vapor pressure of the solvent is lowered and the volatility of the solvent is lowered, thereby adversely affecting the 3D printing. If the temperature of the insulating substrate 120 exceeds 150 캜, the particles melt before being laminated and have a negative influence on 3D printing.

The particles have a size ranging from 3 nm to 500 nm. This is because, if particles having a size of more than 500 nm are used when a small-sized nozzle (less than 3 μm) 130 is used, the nozzle 130 is clogged. In addition, 3D printing is a process for forming a three-dimensional structure. When a structure is laminated, particles are gathered as small gravels to form a 3D structure. Particles larger than 500 nm in size are not stacked like this.

 The air pressure member 160 is provided to supply the ink to the nozzle 130 by supplying air pressure to the nozzle 130 by being connected to the nozzle 130. When the ink is ejected from the nozzle 130, the pneumatic component 160 can provide air pressure to the ink to assist ejection of the ink from the nozzle 130. This pneumatic member 160 may be, for example, a pump.

The conductive substrate 150 is disposed below the insulating substrate 120 to support the insulating substrate 120 and the conductive substrate 150 is grounded. The ground 143 may perform the function of the main body of the printing apparatus 100.

The insulating substrate 120 may be formed of a material such as polyethylene terephthalate (PET), polypropylene (PP), polyethylene (PE), ethylene vinyl acetate (EVA), acrylonite But are not limited to, acrylonitrile butadiene styrene (ABS), polyacetylene, polystyrene, polyurethane, polyamide (PA), and polybutylene terephthalate (PBT) Glass, polyimide (PI), or the like.

The AC power supply 140 may apply a sine-type AC voltage as shown in FIG. 2 or a pulse-type AC voltage as shown in FIG. However, this is merely exemplary, and the case of applying an AC voltage with alternating "+" and "-" voltages in various forms is also included in the technical idea of the present invention.

The AC power supply 140 is electrically connected to the nozzle 130 and applies an AC voltage to the nozzle 130 to generate the electrohydraulic phenomenon. That is, the power source has one terminal 141 electrically connected to apply a voltage to the nozzle 130, and the other terminal 142 grounded to the ground.

The nozzle 130 can be charged with an AC voltage applied by the AC power supply 140 so that the ink droplet 110 is also charged to the side of the nozzle 130 . The " + "charged ink droplet 110 is ejected from the nozzle 130 and is placed on the substrate. At this time, the ink droplet 110 may still be charged with "+ ".

However, the nozzle 130 is not limited to this, and may be charged with a negative polarity, which is opposite to that of the previous one, depending on the characteristics of the AC voltage. Accordingly, the ink droplet 110 is also discharged through the nozzle 130 "-" can be won.

In this case, the ink droplets 110 charged with "-" are discharged from the nozzles 130 and set on the substrate. At this time, the ink droplet 110 charged with " + "by the ink droplet 110 preloaded with" + "can be attracted to the substrate by gravity and this phenomenon is an electrohydrodynamic phenomenon .

Here, the power source applies an alternating voltage having a frequency in the range of 10 Hz to 500 Hz to the nozzle 130 as a voltage in a range of 150 V to 500 V as an AC power source. When the voltage is less than 150 V, the ink is not ejected.

In addition, when the voltage exceeds 500 V, the amount of ink to be printed is large and 3D printing is impossible, and the nozzle 130 is damaged due to an excessively large electric field. However, the power source has been described with reference to the AC power source, but the present invention is not limited to this, and includes the use of a DC power source.

The distance between the nozzle 130 and the insulating substrate 120 is in the range of 5 탆 to 200 탆. If the spacing distance is less than 5 mu m, the amount of the ink to be printed on the nozzle 130 increases, so that 3D printing is impossible and the nozzle 130 is damaged. When the spacing distance exceeds 200 mu m, the ink is not ejected from the nozzle 130.

FIG. 4 is a flowchart showing a printing method (S100) using the printing apparatus 100 shown in FIG.

Referring to FIG. 4, an insulating substrate 120 having a conductive substrate 150 with a grounded portion 143 disposed thereunder is positioned below a nozzle 130 having a diameter ranging from 0.5 μm to 10 μm.

Next, a voltage from the power source is applied to the nozzle 130 so that an electrohydraulic phenomenon occurs in the nozzle 130. The AC power supply 140 includes a first terminal 141 electrically connected to the nozzle 130 to apply a voltage ranging from 150 V to 500 V and a second terminal 142 grounded.

Finally, the ink containing the particles and the solvent is ejected from the nozzle 130 using the electro-hydrodynamic phenomenon to form a three-dimensional structure on the insulating substrate 120.

The spacing between the nozzle 130 and the insulating substrate 120 is set in the range of 5 to 200 mu m and the vapor pressure of the solvent is set to be in the range of 0.01 mmHg to 127 mmHg at 25 DEG C. [

FIG. 5 is a photograph of a three-dimensional structure formed by using the printing method (S100) shown in FIG. 4 in comparison with a comparative example. 5 (a) to 5 (h) are examples showing patterns of three-dimensional structures formed using the printing method S100 according to an embodiment of the present invention, and FIGS. 5 (i) and 5 These are comparative examples deviating from optimum process conditions.

5 (i) and 5 (k), when a black ink is printed by applying a voltage of 600 V to a substrate on which a white column is first printed, excessive ink is printed to form a white columnar shape (See Fig. 5 (i)). When the size of the nozzle 130 is 50 [micro] m, the amount to be printed is too large to perform 3D printing And the distance between the nozzle 130 and the nozzle 130 is 3 [mu] m, the amount of printing is too large to perform 3D printing (see Fig. 5 (k)). 5 (a) to 5 (h), a three-dimensional structure of a desired shape (e.g., a cross, an alphabet, etc.) can be formed with various materials (e.g., silver, cobalt, etc.).

FIG. 6 is a schematic diagram showing a 3D printing apparatus 100 using an electrohydraulic phenomenon according to another embodiment of the present invention.

6, the power source applies an AC voltage to the nozzle 230 with the AC power source 240. [ The power source includes a first terminal 241 electrically connected to apply a voltage to the nozzle 230 and a second terminal 242 grounded. However, the power source is not limited to the AC power source 240 but includes a DC power source.

It is also possible to use the conductive substrate 250 without the insulating substrate 120 of the above-described embodiment. At this time, the conductive substrate 250 is grounded 143 to the printing apparatus 200.

FIG. 7 is a flowchart showing a printing method (S200) using the printing apparatus 200 shown in FIG.

Referring to FIG. 7, the power source of the present invention applies an AC voltage to the nozzle 230 with an AC power source 240. FIG. The power supply includes a first terminal 241 electrically connected to the DC power supply 230 to apply a DC voltage to the nozzle 230 and a second terminal 242 connected to the ground 143.

In the printing apparatus 200 according to another embodiment of the present invention, the insulating substrate 120 is omitted and a conductive substrate 250 is used. At this time, the conductive substrate 250 is grounded 143 to the printing apparatus 200.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

110, 210: Ink
120: Insulating substrate
130, 230: nozzle
140, 240: AC power source
150, 250: conductive substrate
160, 260: pneumatic member

Claims (10)

Dimensional structure with the particles on the insulating substrate while the solvent is being evaporated from the ink by discharging the ink containing the particles and the solvent onto the insulating substrate using the electrohydraulic phenomenon, ;
A conductive substrate disposed under the insulating substrate to support the insulating substrate; And
And a power source electrically connected to the nozzle and applying a voltage to the nozzle to generate the electrohydraulic phenomenon,
Wherein the power source has one terminal electrically connected to apply a voltage to the nozzle and another terminal grounded,
Wherein the conductive substrate is grounded,
The nozzle having a diameter in the range of 0.5 [mu] m to 10 [mu] m,
The power source applies a voltage in the range of 150 V to 500 V to the nozzle,
Wherein a distance between the nozzle and the insulating substrate is in the range of 5 to 200 mu m,
Wherein the vapor pressure of the ink solvent is in the range of 0.01 mmHg to 127 mmHg at 25 [deg.] C. Dimensional structure with the particles on the conductive substrate while the ink is being evaporated in the ink by discharging the ink containing the particles and the solvent onto the conductive substrate using the electrohydraulic phenomenon, And
And a power source electrically connected to the nozzle and applying a voltage to the nozzle to generate the electrohydraulic phenomenon,
Wherein the power source has one terminal electrically connected to apply a voltage to the nozzle and another terminal grounded,
Wherein the conductive substrate is grounded,
The nozzle having a diameter in the range of 0.5 [mu] m to 10 [mu] m,
The power source applies a voltage in the range of 150 V to 500 V to the nozzle,
Wherein the spacing between the nozzle and the conductive substrate is in the range of 5 [mu] m to 200 [mu] m,
Wherein the vapor pressure of the ink solvent is in the range of 0.01 mmHg to 127 mmHg at 25 [deg.] C. The method according to claim 1 or 2,
The particles are.
A 3D printing apparatus using an electrohydraulic phenomenon having a size ranging from 3 nm to 500 nm. The method according to claim 1,
And the temperature of the insulating substrate is in the range of 10 to 150 占 폚. The method of claim 2,
Wherein the electroconductive substrate has a temperature in a range of 10 to 150 占 폚. The method according to claim 1 or 2,
Wherein the power source is an AC power source,
Wherein the AC power source applies an AC voltage having a frequency in the range of 10 Hz to 500 Hz to the nozzle, using an electrohydraulic phenomenon. The method according to claim 1,
The particles included in the ink are:
Having a size ranging from 3 nm to 500 nm,
The temperature of the insulating substrate is in the range of 10 캜 to 150 캜,
Wherein the power source is an AC power source,
Wherein the AC power source applies an AC voltage having a frequency in the range of 10 Hz to 500 Hz to the nozzle, using an electrohydraulic phenomenon. The method of claim 2,
The particles included in the ink are:
Having a size ranging from 3 nm to 500 nm,
The temperature of the conductive substrate is in the range of 10 캜 to 150 캜,
Wherein the AC power source applies an AC voltage having a frequency in the range of 10 Hz to 500 Hz to the nozzle, using an electrohydraulic phenomenon. Positioning an insulating substrate on which a grounded conductive substrate is disposed below a nozzle;
Applying a voltage from a power source to the nozzle such that an electrohydraulic phenomenon occurs in the nozzle; And
And forming a three-dimensional structure on the insulating substrate by discharging ink containing particles and a solvent from the nozzle using the electro-hydrodynamic phenomenon,
Wherein the power supply includes a first terminal electrically connected to apply a voltage to the nozzle and a second terminal grounded,
The nozzle having a diameter in the range of 0.5 [mu] m to 10 [mu] m,
The power source applies a voltage in the range of 150 V to 500 V to the nozzle,
Wherein a distance between the nozzle and the insulating substrate is in the range of 5 to 200 mu m,
Wherein the vapor pressure for the solvent ranges from 0.01 mmHg to 127 mmHg at 25 < 0 > C. Positioning a grounded conductive substrate below the nozzle;
Applying a voltage from a power source to the nozzle such that an electrohydraulic phenomenon occurs in the nozzle; And
And forming a three-dimensional structure on the conductive substrate by discharging ink containing particles and a solvent from the nozzle using the electrohydraulic phenomenon,
Wherein the power supply includes a first terminal electrically connected to apply a voltage to the nozzle and a second terminal grounded,
The nozzle having a diameter in the range of 0.5 [mu] m to 10 [mu] m,
The power source applies a voltage in the range of 150 V to 500 V to the nozzle,
Wherein the spacing between the nozzle and the conductive substrate is in the range of 5 [mu] m to 200 [mu] m,
Wherein the vapor pressure for the solvent ranges from 0.01 mmHg to 127 mmHg at 25 < 0 > C.

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