KR20120001557A - Method for design of screen printing printing by using matching logic - Google Patents

Abstract

PURPOSE: An electronic element printing method using the matching logic for the screen printing is provided to economically mass-produce printing-type electronic elements. CONSTITUTION: An electronic element printing method comprises the following steps: selecting the kind of a printing-type electronic element(S10); setting a substrate, an ink, and the processing condition for the spec of the element(S20); determining the values of impedance matching, chemical matching, geometry matching, mechanical matching, and time matching by the matching condition; determining the spec of a R2R system based on the matching condition after setting a printing method of the element; checking the printed condition of the element before drying and curing; checking the conductivity of the element, and the disconnection or the short circuit or a printing line, and performing a functionality checking process; and repeating the matching value determining process or the printed condition checking process if a failure occurs.

Description

Electronic device printing method using matching logic for screen printing {Method for design of screen printing printing by using matching logic}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for printing electronic devices through matching logic for screen printing, and in particular, a large-scale, low-cost electronic device through screen printing using a roll-to-roll (R2R) printing method. The present invention relates to an electronic device printing method through matching logic that can be produced.

Recently, the continuous process used in the traditional printing process has been focused on the production of large-scale, low-cost electronic device through the roll-to-roll (R2R) printing method. The production of electronic devices through the conventional batch method was not high in productivity due to the complexity of the production process due to the intermittent production method and etching.

On the other hand, the production of the roll-to-roll (R2R) method through a continuous process can continuously produce the material, and the production speed increases rapidly by printing ink containing metal nanoparticles such as silver or nickel directly on the material. However, in order to apply the conventional printing process used for general printing media to electronic roll-to-roll (R2R) printing, there is a problem that the printing precision needs to be increased. The precision of traditional printing processes is 100 microns, which means the minimum error that can be distinguished by the human eye. However, electronic devices require printing precisions of 1 to 50 microns or less, depending on their application.

In general, a continuous process printer includes a sectional type register controller and a compensator roll type register controller. In recent continuous process printing, a sectional type register controller is used.

More specifically, with reference to FIGS. 1 and 2 will be described respectively.

First, FIG. 1 is a configuration diagram of a compensation roll type register controller. Referring to FIG. 1, the compensation roll type register controller transmits a driving force to one main motor to rotate each of the printing rolls. In this case, a gear box is installed on each roller. It can be seen that all the printing rolls are rotated at the same speed. In addition, a compensator roll is provided between the printing rolls, and the printing position is controlled by adjusting the span length through the movement of the compensating roll. However, this method requires additional equipment, such as compensation rolls, main motors, gearboxes and linear motion guides, which are inefficient in terms of cost and space utilization.

In order to alleviate this disadvantage, a sectional type register controller as shown in FIG. 2 is used. The sectional type register controller removes the main shaft and drives each printing cylinder with a separate motor, so that individual speed control of each printing cylinder is possible. The compensator roll is also gone.

Therefore, the control method of register error is also changed. Conventional compensator roll type printers compensate for register errors by changing the span length through the movement of the compensator rolls to generate phase differences between the print rolls, whereas in section type printers, the motor speed of each printing cylinder Compensate for errors through change. That is, the principle of compensating for the register error by changing the phase of the print roll by the size of the register error.

On the other hand, the main technologies for electronic device printing are metal ink (ink viscosity, solvent content, metal material type: nickel, silver, copper, etc.), material (substrate: surface treatment: corona coating, etc.), surface tension, surface roughness, light transmittance ), Process variables (tension, velocity, nip force, etc.), cell shape (pyramid, trapezoid, etc., cell depth size), dry (air flow rate, wind speed, etc.), curing conditions (curing: curing) Type-IR (infrared rays), UV (ultraviolet rays), electron beams, etc.) are important.

Until now, the technology for the roll-to-roll (R2R) printing of electronic devices has been conducted as a separate study in each field, and there is no research for the production of printed electronic devices having the characteristics as an integrated product.

The present invention has been proposed to solve the problems of the prior art, an object of the present invention by using a roll-to-roll (R2R) screen printing method of electronic devices through matching logic that can produce a large-scale, low-cost printed electronic device To provide a printing method.

Another object of the present invention is to provide an electronic device printing method through matching logic that enables implementation of a roll-to-roll (R2R) electronic device printing system suitable for electronic device printing.

As a means for solving the above problems, an electronic device printing method through the matching logic according to the present invention, the method comprising the steps of (a) determining the type of printed electronic device (material); (b) determining a substrate, ink, and processing conditions suitable for the specification of the material; (c) determining the impedance matching, the chemical matching, the geometry matching, the mechanical matching, and the time matching values of the material using a matching condition; (d) determining a specification of a roll-to-roll (R2R) screen printing system using a matching condition after determining a printing method of the material; (e) inspecting the printing state of the material printed by the roll-to-roll (R2R) screen printing system, and then drying and curing; (f) conducting a final performance test after inspecting disconnection or short circuit, uniformity and roughness, and print thickness of the printed pattern together with the conductive test of the cured material; And (g) repeating the steps (c) to (e) if any one of the print state, conductivity, and print pattern is poor in steps (e) and (f),

In the step (b), the substrate includes the width, thickness and thermal conditions of the web material to be used, the ink Ink includes viscosity, water soluble or fat soluble ink type, metal content, metal particle size, , The process conditions include operating speed, operating tension, drying, curing conditions,

In the step (c), the geometry matching is characterized by determining a mesh size, a squeegee contact angle, a shape of a printed pattern patterned on the screen, and values for coated materials through matching conditions. .

According to the electronic device screen printing printing method through the matching logic according to the present invention, it is possible to implement a roll-to-roll (R2R) electronic device printing system suitable for electronic device printing.

In addition, by using a roll-to-roll (R2R) printing method, a large-scale, low-cost printed electronic device can be produced.

1 is a block diagram of a conventional compensation roll type register controller;
2 is a configuration diagram of a conventional sectional type register controller;
3 and 4 are flowcharts illustrating a method of printing an electronic device through matching logic according to an embodiment of the present invention;
5 illustrates an embodiment of flat screen printing;
And,
6 is a diagram illustrating an embodiment of rotary screen printing.

The terms or words used in this specification and claims are not to be construed as limiting in their usual or dictionary meanings, and the inventors may properly define the concept of terms in order to best explain their invention in the best way possible. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise. In addition, the terms “… unit”, “… unit”, “module”, etc. described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. have.

Hereinafter, with reference to the drawings and preferred embodiments of the present invention will be described in detail the technical configuration of the present invention.

Electronic device printing method

3 and 4 are flowcharts illustrating an electronic device printing method through matching logic according to a preferred embodiment of the present invention.

First, the type (for example, RFID, solar cell, signage, etc.) of the final printed electronic device (material) is determined (step S10).

Subsequently, a substrate, ink, process conditions, and the like that meet the specifications of the final electronic device are determined (step S20). Here, the substrate includes the width, thickness, thermal conditions of the web material to be used, the ink (Ink) includes the viscosity, the type of water-soluble or fat-soluble ink, the metal content, the metal particle size, the process conditions Operating speed, operating tension, pressure roll pressure, drying, curing conditions and the like.

Next, the impedance matching, the chemical matching, the geometry matching, the mechanical matching, and the time matching values of the material are determined using a matching condition (step S30). .

Values determined through the matching condition are as follows.

1) Impedance Matching

Sensitivity: Sensitivity of electronic device driving performance against external environment and noise

Skin depth of printed pattern

Trace design: the spacing between lines in a printed pattern

Working surroundings in which electronic device circuits are driven

2) Chemical Matching

Ink formulation: The way in which the ink, such as formulation, components, and properties, is made.

Substrate property: indicates the degree of response of the material to the transferred ink. Tension, roughness, etc.

Viscosity: Shows the viscosity of the ink and can check the mixing degree of the solvent.

-Adhesion interaction: It expresses the adhesion relationship with the material and the transition in the printing pattern on the roll.

3) Geometry Matching

Mesh size: shows the mesh size of the screen printing mesh.

Squeegee contact angle: indicates the angle of the squeegee in contact with the mesh

Gap: The distance between the mesh and the printed object in flat screen printing.

4) Mechanical Matching

-Tension: Expresses the force exerted on the printed material during the transport of the material.

Velocity: indicates the velocity of the conveying material, which is related to the ink transfer

Squeegee pressure: The pressure on the squeegee in flat screen printing.

Impression pressure: In rotary screen printing, the pressure roll indicates the pressure that the pressure roll presses to adhere the printed material to the rotary roll.

-Dring and curing: refers to the method of solidifying using hot air or other means to protect the liquid or gel pattern transferred to the material.

Here, among the factors affecting print quality when using screen printing, which is one of printing techniques, parameter variation for screen printing is described in geometry matching.

5) Time Matching

-Change scheduling techniques (RM, EDF, LDF, etc.)

-Change of control method (PID control, feedforward control, MIMO control, etc.)

-Change the number of input / output

FIG. 5 is a schematic diagram of flat screen printing. When the ink is rubbed using a squeegee after the ink is applied onto the screen, the ink escapes through a hole previously drilled in the screen to form a printing pattern.

FIG. 6 is a roll screen implementation of the flat screen printing disclosed in FIG. 5, which enables continuous printing by making the screen into a roll shape rather than a flat plate.

The specification of the roll-to-roll (R2R) system is determined using the matching condition (step S90). At this time, the specification of the roll-to-roll (R2R) system is to determine the operating tension of each span, the width and length ratio of the material used, the length and temperature of the drying section, the anticorrosion, the length, temperature, anticorrosion determination of the curing section, taper tension determination , Printing method determination, Nip method determination, register controller precision determination, cooling scheme determination.

Then, (e) inspect the printing state of the material printed through the roll-to-roll (R2R) system (step S100). At this time, if the inspection result print state is poor (NO in step S100), the process returns to the previous step (S30 to S70), and if the inspection result print state is good (YES in step S100), the next step S110 Go to and dry the printed material.

Then, after drying the material, the error of the printing line due to the hot air is checked. At this time, the inspection target of the printed line inspects the thickness and thickness uniformity of the line, roughness, degree of bleeding and the like.

Then, the dried material is cured (the process of melting metal particles and metallization connected internally) (step S120).

Then, the conductive line of the cured material is inspected to check whether the printed lines are disconnected or short-circuited (step S130). At this time, if the inspection result print state is poor (NO in step S130), the process returns to the previous step (S30 to S70), and if the inspection result print state is good (YES in step S130), the next step S140 Go to and test the performance of the final product.

Then, if the result of the performance test of the final product is bad (NO in step S140), the process returns to the previous step (S30 to S70), and if the product state is good as a result of the inspection (YES in step S140), the program To exit.

While the invention has been described in detail with respect to the embodiments described, it will be apparent to those skilled in the art that various modifications and variations are possible within the spirit of the invention, and such modifications and variations belong to the appended claims.

Claims (9)

In the electronic device printing method,
(a) determining the type of printed electronic device (material);
(b) determining a substrate, ink, and processing conditions suitable for the specification of the material;
(c) determining the impedance matching, the chemical matching, the geometry matching, the mechanical matching, and the time matching values of the material using a matching condition;
(d) determining a specification of a roll-to-roll (R2R) system using a matching condition after determining a printing method of the material;
(e) inspecting the printing state of the material printed by the roll-to-roll (R2R) system and then drying and curing;
(f) conducting a final performance test after inspecting the disconnection or short circuit of the printed line together with the conductivity test of the cured material; And
(g) repeating steps (c) to (e) if any one of the printing state, conductivity, and printing line in step (e) and (f) is poor; and
In step (b),
The substrate includes the width, thickness and thermal conditions of the web material to be used, the ink contains viscosity, the type of water-soluble or fat-soluble ink, the metal content, the metal particle size, and the process conditions include the operating speed. , Driving tension, drying, curing conditions,
In step (c), the geometry matching is
A method of printing an electronic device, characterized in that the values of the dot size of the screen, the squeegee contact angle, the shape of the printed pattern patterned on the screen, and the values of the coated material are determined through matching conditions.
The method of claim 1, wherein the impedance matching in step (c) is:
Sensitivity of printed electronic device driving performance against external environment and noise, thickness of printed pattern, line-to-line spacing among printed patterns, and external environment in which printed electronic pattern is driven through matching condition Electronic device printing method characterized in that it determines.
The method of claim 1, wherein the chemical matching in step (c) is:
Ink formulation, which shows how the ink is formulated, composition, properties, etc., substrate characteristics indicating the degree of reaction of the material to the transferred ink, such as surface tension and roughness, and the degree of mixing of the solvent. A method for printing an electronic device, characterized in that the values for the viscosity of the ink, the adhesion relationship between the raw material at the time of ink transfer and the adhesion relationship representing the relationship transferred in the printing pattern on the roll are determined through matching conditions.
The method of claim 1,
In the step (c), the mechanical matching is:
-Tension: Expresses the force exerted on the printed material during the transport of the material.
Velocity: indicates the velocity of the conveying material, which is related to the ink transfer
Squeegee pressure: The pressure on the squeegee in flat screen printing.
Impression pressure: In rotary screen printing, the pressure that the pressure roll presses to bring the printed material against the rotary roll; the force applied to the printed material during the transfer of the material, and the roll during printing. Printed electronic device, characterized in that the value of the pressure, the driving force (riding roll) used to prevent air intake during winding, the speed of the conveying material, drying and curing through the matching conditions Way.
The method of claim 1,
In the step (c), the time matching is:
A method for printing an electronic device, characterized in that values for a scheduling scheme change, a control method change, and an input / output number change are determined through matching conditions.
The method of claim 1,
In step (d) the specification of the roll-to-roll (R2R) system is
Determination of the operating tension of each span, determination of the width and length ratio of the material used, determination of the length and temperature of the drying section, determination of the length of the curing section, determination of the length of the curing section, determination of the taper tension, determination of the printing method, determination of the nip method, An electronic device printing method comprising determining a register controller precision and determining a cooling method.
The method of claim 1,
The printing status test in the step (e) is:
Electronic device printing method comprising the thickness and uniformity of the thickness of the printed line, the degree of bleeding.
The method of claim 1,
And drying the material in step (e) and performing an error check of the printing line due to hot air.
The method of claim 1,
The printed electronic device
Electronic device printing method characterized in that any one of electronic devices, including RFID, Solar cell, signal system.

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