KR100987160B1 - Printing Method of Printed Electronics - Google Patents

Abstract

The present invention relates to a printed electronic device printing method using an intermediate transfer member for transferring a functional ink from a plate making to a printed object, wherein the transferability of the functional ink to the printed material can be improved. It is about.

The present invention relates to a method for printing a printed electronic device using an intermediate transfer member for transferring a functional ink from a plate making to a printed object, comprising the steps of: (a) applying a coating material to the intermediate transfer member; (b) transferring the functional ink from the plate making to the intermediate transfer body to which the coating material which has been subjected to step (a) is applied; And (c) transferring the intermediate transfer material to which the functional ink which has passed through step (b) is transferred to the printed material.

Printed electronic device, intermediate transfer, functional ink, transferable, coating material

Description

Printing Method of Printed Electronics

The present invention relates to a method for printing a printed electronic device, and more particularly, in a method for printing a printed electronic device using an intermediate transfer, a printing capable of improving the transferability of conductive, insulating or semiconducting functional ink to a printed body. The present invention relates to an electronic device printing method.

In general, printed electronics refers to electronic devices or electronic products made by a printing process technique, and the printed electronic devices may include a radio frequency identification tag (RFID tag) and a printed curcuit board (PCB). There are electronic components which require the formation of electrodes, conductive electrodes such as EMI (electromagnetic interference) shielding films, and the like. In the printing method of the printed electronic device, a pattern may be implemented by printing the electronic components requiring formation of the conductive electrode. The method of hardening and producing below the melting point of a metal is mainly applied.

As an example of a method of manufacturing an antenna of a wireless tag, a printing method of a printed electronic device is described. First, various functional materials such as screen, gravure, inkjet, flexo, etc. are printed on an insulator such as paper or film. Printing method, and then applying appropriate heat or supplying energy such as ultraviolet rays and ultrasonic waves to dry and solidify the printed functional ink to have conductivity.

At this time, in the method of printing a chip in the method of printing an electronic device, in implementing a superimposed printing of a functional ink having conductivity, semiconductivity, and insulation, a plate of a hard metal material and a printed body, such as a gravure printing method, Met.

In this case, however, a high pressure printing pressure is required to print the functional ink on the printed object. However, printing at such a high pressure may destroy previously printed patterns and degrade precision and electrical performance. Printing is carried out using rollers, which are intermediate transitions such as rubber, which can lower the transition pressure between the prints.

In addition, in the case where the intermediate transfer body is used, another example is that the printed body is a curved surface even when the printed body is a curved antenna such as a mobile phone antenna. In the case of glass substrates of display devices such as PDPs and LCDs, which are being studied, a flexible intermediate transition body such as rubber is used because the printed object is not deformed and is weak to high pressure.

By the way, in the printing method using the above-mentioned intermediate transfer material, since the functional ink having conductivity, insulation, or semiconductivity is inferior in transferability unlike the ink for general printing, it is functional to the intermediate transfer body containing the functional ink after printing. Since the ink remains, continuous printing causes the thickness of the printed matter to be low or uneven to cause disconnection.

In addition, when the functional ink is a conductive ink having a high metal content, as the printing operation is performed, it is difficult to achieve uniform quality and conductivity after printing because the conductive ink continuously forms a film as it is cured in the intermediate transfer body.

Accordingly, the present invention has been made to solve the above problems, in the printing electronic device printing method using the intermediate transfer, before the transfer of the functional ink to the intermediate transfer, the intermediate transfer and the functional ink directly The present invention provides a method of printing a printed electronic device, by applying a coating material to an intermediate transfer member to prevent contact, so that functional ink does not remain in the intermediate transfer unit after printing, thereby improving the transferability of the functional ink to the printed body. The purpose is.

Printed electronic device printing method according to the present invention for achieving the above object, relates to a printed electronic device (Printed Electronics) printing method using an intermediate transfer to transfer the functional ink from the plate making to the printed material, (a Applying a coating material to the intermediate transfer; (b) transferring functional ink from the plate making to the intermediate transfer member to which the coating material which has passed the step (a) is applied; And (c) transferring the intermediate transfer material to which the functional ink has passed through step (b) is transferred to the printed material.

In addition, the present invention may further comprise the step of drying the coating material of the intermediate transfer through the step (a) by any one method selected from hot air, UV or IR.

At this time, the drying step is to dry the coating material at a drying rate of 40% to 80%.

Here, it is preferable that the coating material is polar when the functional ink is polar, and non-polar when the functional ink is nonpolar.

Furthermore, when the functional ink and the coating material are polar, the surface energy difference is 10 mN / m or more, and when the functional ink and the coating material are nonpolar, the surface energy difference is preferably 2 mN / m or less.

On the other hand, the method of applying the coating material to the intermediate transfer of the step (a) may be a coating or printing.

In addition, the coating material in the step (a) preferably contains a polymer-based material.

Through the problem solving means as described above, the printing electronic device printing method according to the present invention, by applying a coating material before the transfer of the functional ink to the intermediate transfer to prevent the functional ink directly contact the intermediate transfer, Since the functional ink does not remain in the intermediate transfer member after printing, the transferability of the functional ink to the printed object can be improved, thereby improving print quality and ensuring uniformity, and also improving the life of the intermediate transfer member.

Hereinafter, a method of printing a printed electronic device according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a process flowchart showing a method of printing a printed electronic device according to an embodiment of the present invention.

Referring to the drawings, the printing electronic device printing method according to a preferred embodiment of the present invention, the step of applying a coating material to the intermediate transfer (S10), and the step of applying a coating material to the intermediate transfer and drying ( S20), transferring the functional ink from the platen to the intermediate transfer body to which the coating material is applied and dried (S30), and printing the intermediate transfer transfer of the functional ink onto the printed body to transfer the functional ink to the printed body. (S40).

First, in the step of applying the coating material to the intermediate transfer (S10), it is preferable to apply a coating or printing method as a method of applying the coating material to the intermediate transfer.

Here, the coating material is preferably a liquid, it can be variously applied according to the conditions of the functional ink, plate making, intermediate transfer, the printed body.

Looking in detail in the selection of the coating material, the coating material is greatly affected by the properties of the functional ink, preferably, if the functional ink to be transferred has a polar property, it is better to apply a polar coating material, while When the functional ink to be transferred is nonpolar, it is preferable to apply a nonpolar coating material.

Furthermore, in order to facilitate the transition of the functional ink from the plate making to the intermediate transfer, when the functional ink and the coating material are polar, the surface energy difference between the functional ink and the coating material is preferably 10 mN / m or more. If the coating material is non-polar, the difference in surface energy between the functional ink and the coating material should be 2 mN / m or less.

For example, in the case of a printing electronic device printing method using an intermediate transition formed of a silicon-based rubber having non-polar functional ink filled with a chromium-coated high surface energy plate and having a non-polar characteristic, In order to make the transition from plate making to the intermediate transition easily, the surface energy of the functional ink and the surface transition of the intermediate transition should be approximated, so the surface energy difference should be less than 2mN / m. If the difference is large, in order to facilitate the transfer of the functional ink, it is preferable to apply a coating material having a surface energy (<2 mN / m) close to the surface energy of the functional ink to the intermediate transfer body.

On the other hand, after applying the coating material to the intermediate transfer, it is preferable to dry the coating material of the intermediate transfer.

The reason for this is to dry the surface of the intermediate transfer body to which the coating material is applied, to reduce the property of the liquid coating material to flow down, and to easily maintain the shape of the pattern around the surface. This is because the whole material is solidified into a single mass and formed as a film, so that the entire coating material is easily transferred to the printed material at the time of transition.

Therefore, by applying the coating material to the intermediate transfer and then drying, not only can the transferability of the functional ink be improved, but also the transferability of the coating material is increased when transferring the functional ink to the printed object, thereby accompanying the transferability of the functional ink. The effect can be improved.

Here, the drying rate of the coating material in the drying step is differentially applied depending on the evaporation temperature, evaporation, etc. of the functional ink, it is preferable that the coating material is dried at a drying rate of 40% to 80%.

The method of drying the coating material of the intermediate transfer after applying the coating material to the intermediate transfer, it is good to use any one method selected from hot air, UV or IR.

FIG. 2 is a schematic cross-sectional view illustrating a process of transferring functional ink from plate making in a state in which a coating material is applied to an intermediate transfer body in a method of printing a printed electronic device according to an exemplary embodiment of the present invention, and FIGS. 3A and 3B are FIGS. It is a schematic process sectional drawing which shows the process of transferring a functional ink to a to-be-printed body in the state which transferred the functional ink to the intermediate transfer body shown in FIG.

First, referring to FIG. 2, in the printing electronic device printing method according to the present invention, the coating material 30 is applied to the intermediate transfer body 20, and then the functional ink 15 is formed from the plate making 10 as shown. ) So that the intermediate transfer member 20 and the functional ink 15 do not directly contact each other by the coating material 30.

Here, the intermediate transfer body 20 may contain a polymer-based material such as rubber, may form a curved surface, and may be made of a highly elastic material such as rubber.

After the transfer of the functional ink 15 from the plate making 10 to the intermediate transfer body 20 to which the coating material 30 has been applied by the above-described method, as shown in FIGS. 3A and 3B, the blood to be printed The functional ink 15 is transferred to the intermediate transfer body 20 on the printed matter 40.

FIG. 3A illustrates a case in which both the coating material 30 and the functional ink 15 are transferred to the printed material 40, and the printed material 40 is peeled off like a film to which the coating material 30 is connected. The functional ink 15 and the coating material 30 are transferred together, so that the functional ink 15 is all transferred to the printed object 40 and thus high transfer effect of the functional ink 15 to the printed object 40 is achieved. You can get it. In this case, the coating material 30 may contain a polymer-based material.

As described above, the printed material 40 to which both the coating material 30 and the functional ink 15 are transferred is a protective film or insulation by curing the coating material 30 by a process of drying the functional ink 15, which is a subsequent process. Alternatively, the coating material 30 may alternatively evaporate, leaving only a pattern by the functional ink 15.

On the other hand, FIG. 3B is a view showing a case in which a part of the coating material 30 remains in the intermediate transfer body 20 when the functional ink 15 is finally transferred to the printed object 40, unlike FIG. 3A. Although the coating material 30 remains in the intermediate transfer body 20, the functional ink 15 does not remain in the intermediate transfer body 20 and the functional ink 15 is transferred to the printed object 40. In addition, the object of transferring all of the functional ink 15 to the printed object 40 without leaving the functional ink 15 in the intermediate transfer body 20 to be finally achieved by the present invention can be achieved.

3A and 3B, after the final printing, the functional ink 15 and the coating material 30 are transferred together or applied to the intermediate transfer body 20 after the final printing. Remaining of the material 30 can be selectively selected according to the use of the printed object 40 to be printed, and can be adjusted according to the curing and evaporation temperature of the coating material 30.

On the other hand, the present invention is applicable to all printing using the intermediate transfer 20, such as pat printing, gravure offset printing, flexo.

In the method for printing a printed electronic device according to the preferred embodiment of the present invention, the intermediate transfer member 20 and the functional ink 15 directly contact each other before the transfer of the functional ink 15 to the intermediate transfer member 20. By applying the coating material 30 so as not to, the entirety of the printed object 40 without leaving the functional ink 15 in the intermediate transfer body 20 after the final transfer of the functional ink 15 to the printed object 40. By transferring, the transferability of the functional ink 15 to the printed object 40 can be improved, thereby improving print quality and ensuring uniformity and extending the life of the intermediate transfer body 20.

The above embodiments are merely exemplary, and various modifications and equivalent other embodiments are possible to those skilled in the art.

1 is a process flow diagram showing a method for printing a printed electronic device according to an embodiment of the present invention,

FIG. 2 is a cross-sectional view schematically illustrating a process of transferring functional ink from plate making in a state in which a coating material is applied to an intermediate transfer body in a method of printing a printed electronic device according to an embodiment of the present invention; FIG.

3A and 3B are cross-sectional views schematically illustrating a process of transferring a functional ink to a printed object in a state in which the functional ink is transferred to the intermediate transfer member shown in FIG. 2.

<Description of the symbols for the main parts of the drawings>

10 ... engraving 15 ... functional ink

20 ... intermediate transfer 30 ... coating material

40 ... printed object

Claims (7)

In the printed electronics printing method using the intermediate transfer to transfer the functional ink from the plate making to the printed material, (a) applying a coating material to the intermediate transfer body; (b) transferring a functional ink from the plate making to the intermediate transfer body to which the coating material which has passed the step (a) is applied; And (c) transferring the functional ink of the intermediate transfer, which has undergone the step (b), to the printed material, Drying the coating material of the intermediate transfer through the step (a) by any one method selected from hot air, UV or IR, and drying the coating material at a drying rate of 40% to 80%. , The coating material, If the functional ink is polar, apply the polarity, if the functional ink is non-polar, apply the non-polar, And the surface energy difference is 10 mN / m or more when the functional ink and the coating material are polar, and the surface energy difference is 2 mN / m or less when the functional ink and the coating material are nonpolar. delete delete delete delete The method of claim 1, The method of applying the coating material to the intermediate transfer of step (a) is a printing electronic device printing method characterized in that the coating or printing. The method of claim 1, The coating material in the step (a) is printed electronic device printing method characterized in that it contains a polymer-based material.

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