TWI527707B - Method for fabricating screen printing mask and structure of mask fabricated thereof - Google Patents

Description

Method for preparing mask for screen printing and mask structure prepared thereby

The present invention relates to the technical field of screen printing, and more particularly to a method for preparing a mask for screen printing, and a mask structure prepared by the method.

In recent years, due to the demand for electronic products in the low-cost consumer market, screen printing technology has been more and more widely applied to the production of electronic products; in particular, for example, by a touch panel or the like. It is an electronic product with a line pattern, in which the formation of a line pattern can be produced by a relatively inexpensive screen printing technique.

1 to FIG. 4; FIG. 1 is a cross-sectional view showing a mask for a conventional screen printing, illustrating that the screen printing technique of the above-mentioned line pattern is implemented on a mask 10, which is composed of a conventional mask 10 A conventional latex 30 is disposed on a substrate 20, and a screen 40 is composited on the conventional latex 30. FIG. 2 is a top plan view of the screen of FIG. 1 illustrating that the screen pattern 70 has been patterned on the screen 40. The channel 70a is provided to remove the liquid infiltration into the channel 70a to wash away the conventional latex 30, thereby forming an ink tank 60 for filling the ink 50 to form the line pattern 70; FIG. 3 discloses the mask of FIG. The cross-sectional illustration shows that the coating ink 50 can be applied to the mask 10 so that the ink 50 can be firmly packed in the ink tank 60, and the lines on the substrate 20 can be formed by exposure, development, etching, and the like. Figure 70.

However, as disclosed in FIG. 3, under the fine observation, generally, for example, a substrate 20 made of glass or other insulating material, there are often some minute convex portions 21 on the surface thereof, and these convex portions 21 cause the substrate. 20 tables The surface is not flat under the microscopic, and the layout design of the wiring pattern 70 has gradually become more refined and complicated, and the minute projections 21 on the substrate 20 are present critically at the edge of the ink tank 60. At this time, the ink 50 packed in the ink tank 60 is easily exposed by the protrusion of the convex portion 21 to form the cavity 22; since these holes 22 are located at the edge of the ink tank 60, it is often easy to match the ink tank 60. In connection with each other, the ink 50 which causes the pressure application and tamping in the ink tank 60 often overflows into the cavity 22 in the periphery of the ink tank 60, thereby causing an ink overflow phenomenon; referring to FIG. 4, the conventional mask is formed. A top plan view of the line pattern illustrates that in the example shown in FIG. 4, the ink spill area 71 present in the line pattern 70 is caused by an ink spill. Based on this reason, the screen printing of fine line graphics is facing a severe test of poor production yield. Therefore, how to improve the unevenness of the surface of the substrate is a technical problem that the general knowledge must face in order to avoid the phenomenon of ink spillage.

In view of the above, the present invention improves the preparation procedure of the mask for screen printing to solve the problem that the surface of the substrate is uneven and causes ink overflow during printing.

According to an embodiment of the invention, there is provided a method of preparing a mask for screen printing, the method comprising the steps of: constructing an ink tank of a line pattern, the method comprising: coating a layer of soft latex, and filling the soft latex a surface of the substrate having roughness, followed by a layer of conventional latex for printing covering the soft latex, and then a screen is formed on the conventional latex to form a mask for screen printing; wherein the soft latex is soft relative to the conventional latex . Further, the ink tank is a channel provided with a line pattern by a screen, and is removed by using a removing liquid to wash the soft latex in the channel and the conventional latex. Set up.

Further, the roughness comprises a person established by a raised portion present on the surface of the substrate. Further, the soft latex is a surface of the substrate which has a convex portion other than the ink tank.

Further, the substrate is a glass substrate.

Further, the conventional latex is a resin. Further, wherein the soft latex is a soft resin relative to the conventional latex.

According to the above method, the present invention utilizes the soft latex to soften the characteristics of the conventional latex, sequentially through the means of filling the soft latex and covering the conventional latex, thereby further applying the surface of the substrate existing on the substrate outside the ink tank (including the edge of the ink tank). Leveling.

Further, according to an embodiment of the present invention, there is provided a mask structure prepared by the above-described preparation method, wherein the soft latex is formed integrally between the substrate and the conventional latex.

According to the above mask structure, the present invention facilitates screen printing on the mask by virtue of the surface of the substrate which has been leveled in the mask, especially when printing ink on the mask, effectively avoiding screen printing The ink used is overflowed by the overhead of the convex portion at the edge of the ink tank, thereby increasing the yield of the fine line pattern during printing, and contributing to mass production to increase productivity.

For the specific implementation details of the above-mentioned technical means and the efficacy thereof, please refer to the following embodiments and drawings.

In view of the implementation of the present invention, please refer to FIG. 5 and FIG. 6a to FIG. 6d together; wherein FIG. 5 discloses a block flow chart of the preparation method of the present invention, and FIGS. 6a to 6d They are respectively sectional views of the structure of the flow shown in Fig. 5. The above embodiment illustrates an embodiment of the present invention to provide a method for preparing a mask for screen printing. In the present embodiment, a touch panel to which a line pattern is attached is exemplified for the purpose of implementing the method of the present invention. That is, it is possible to overcome the problem that the surface of the substrate is uneven. As shown in FIG. 5, the method includes the step of constructing an ink tank of a line pattern, and further, the step includes steps S1 to S4, wherein:

Step S1: providing a substrate.

As shown in FIG. 6a, this step provides a glass having good light transmittance as a substrate 20 for forming a mask pattern and then forming a wiring pattern, which becomes a touch panel after forming a wiring pattern. Wherein, since the glass substrate 20 provides a processed surface forming a line pattern which is rough under the microscopic appearance, the roughness includes the one or more raised portions 21 present on the surface of the substrate, the protrusion The portion 21 has an irregular surface profile.

Step S2: Coating a soft latex.

As shown in FIG. 6b, in this step, the substrate 20 is used as a blank material, and a soft latex 81 is coated on the processed surface of the substrate 20 to form a line pattern; the soft latex 81 is in a viscose shape and has soft plasticity. For example, it may be a paste-like latex made of a resin; when the soft latex 81 is applied, the soft latex 81 may be padded to the substrate 20 having roughness by, for example, pressing or flattening the blade 90. The surface, whereby the convex portion 21 located on the surface of the substrate can be easily flattened by the filling of the soft latex 81.

Step S3: Deploying a conventional latex.

As shown in FIG. 6c, after performing the above step S2, it is necessary to cover a layer of conventional latex 31 for printing to cover the soft latex 81; the conventional latex 31 comprises a film (or laminate film) which has been previously formed into a sheet shape. For example, a sheet-like film made of a resin may be used as the conventional latex 31. Similarly, the conventional latex 31 also has soft plasticity, but the above-mentioned soft latex 81 must be soft relative to the conventional latex 31; in other words, The plasticity of the paste-like soft latex 81 is relatively superior to that of the sheet-like conventional latex 31; since the substrate 20 having roughness is substantially flattened after performing the above step S2, it can be employed when the conventional latex 31 is disposed. For example, in the form of lamination processing, the sheet-like conventional latex 31 is flatly hot-pressed on the soft latex 81; wherein the soft latex 81 located between the surface of the substrate and the conventional latex 31 is provided during the lamination process. Excellent adhesion, and, in addition, the force applied during lamination processing, can ensure that the conventional latex 31 can adhere more firmly to the surface of the substrate 20, among which Solidly attached to the irregular surface contour of the boss portion 21.

In addition, the conventional latex 31 described above may also be a paste-like emulsion made of a resin, and the soft latex 81 is covered by, for example, pressing or scraping the above-mentioned squeegee 90, but it is necessary, The soft latex 81 is softer than the conventional latex 31 and is an indispensable preparation condition of the present invention.

Step S4: Layout the screen.

As shown in Fig. 6d, after performing the above step S3, a screen 41 must be laminated on the conventional latex 31 to form a mask 11 for printing. Wherein, the screen 41 has been marked with a channel L for subsequently constructing a line pattern, and the channel L is formed by forming an opening between the groove walls L1 and L2 on both sides, and the channel L is used as a cover. The mold 11 is filled with ink and adhered to the substrate 20 Entrance.

Further, the present invention further includes the step S5 of constructing the ink tank.

Please refer to FIG. 7 and FIG. 8 in combination; FIG. 7 is a schematic diagram showing the ink groove of the present invention built on the mask, and FIG. 8 is a cross-sectional view showing the mask for screen printing prepared by the program of FIG. . As shown in FIG. 7, after performing the above step S4, the channel L position on the screen 41 shown in FIG. 8 can be followed, and a channel for removing the liquid in the mask 11 is infiltrated by self-alignment. In order to simultaneously wash out the conventional latex 31 and the soft latex 81 in the interior of the channel L, an ink tank 61 is formed which is formed inside the channel L and which is concave, wherein the ink tank 61 is formed. The bottom of the trough reveals the surface of the substrate that is in contrast to its channel profile.

In addition, the above-mentioned soft latex 81 and the conventional latex 31 should be taken out of a material which is advantageous for being washed away by the removal liquid. When the soft latex 81 and the conventional latex 31 are used as a resin, the resin may be exemplified by acrylic acid. Vinyl acetal resin such as resin, epoxy resin, vinyl acetate resin, vinyl chloride resin, vinylidene chloride resin, polyvinyl butyral, polystyrene, polyethylene, polypropylene and its chloride, poly Polyester resin such as ethylene terephthalate or polyethylene isophthalate, polyamide resin, vinyl modified alkyd resin, phenol resin, xylene resin, polyimide resin, gelatin, carboxy One of materials such as a resin of a cellulose ester derivative such as methyl cellulose. In contrast, the removal liquid must use a resin removal liquid which can dissolve or disperse the above resin material, and the resin removal liquid can be exemplified by an alkali metal carbonate, an alkali metal phosphate, an alkali metal hydroxide, and an alkali metal. An aqueous solution of one of the citrates. After washing the conventional latex 31 and the soft latex 81 inside the channel L through the resin removing liquid, it may be washed by water or acid. The mask 11 immediately stops the operation of washing the resin. Wherein, the screen 41 can be made of a material that is not corroded or washed by the removal liquid (for example, a metal screen, etc.).

On the other hand, since the above-mentioned soft latex 81 is soft and plasticizable with respect to the conventional latex 31, and the above-exemplified resin materials are all water-soluble, it is convenient to prepare a soft latex 81 by using some resin-soluble water-soluble preparation agent. It is softer than the conventional latex 31 so as to be pressed or flattened by using the squeegee 90 shown in the portion of FIG. 6b to flatten the surface of the uneven substrate; secondly, the above-exemplified resin material can also pass through the glue. The film forming method is used to form a sheet-like film in advance to be used as the conventional latex 31.

In the process of constructing the ink tank 61 in step S5 shown in FIG. 7, even if the removal liquid encounters the convex portion 21 after washing the soft latex 81, it can self-align according to the groove L on the screen 41. The ink tank 61 is constructed to make the groove wall of the ink tank 61 flat, in particular, because the boss portion 21 which is critically present at the edge of the ink tank 61 has an end portion 21a which is located outside the ink tank 61, the end The irregular contour surface of the portion 21a has been filled and leveled by the soft latex 81 in the above step S2, so that there is no void communicating with the ink tank 61.

According to the above method, an embodiment of the present invention is to prepare a screen printing mask structure (as shown in FIG. 8) which is less prone to ink overflow phenomenon; wherein, from a structural point of view, the mask structure is included in The substrate 20 is covered with a layer of latex 80; more specifically, since the surface of the substrate is formed with a roughness established by the protrusions 21, the surface of the substrate can be leveled by the coverage of the layer of the latex layer 80; The stencil 41 is composited on the latex layer 80, and the channel L of the circuit pattern is disposed on the latex layer 80 and the screen. An ink tank 61 is formed on the surface of the substrate 20 between 41. Further, in the above, the latex layer 80 comprises a composite of a conventional latex 31 and a soft latex 81 which is relatively soft compared to the conventional latex, so that the soft latex 81 can be formed on the surface of the substrate having roughness outside the ink tank 61, in more detail. It is said that the soft latex 81 can be formed on the surface of the substrate having the convex portion 21 outside the ink tank 61; in addition, the screen 41 is composited on the conventional latex 31, and the conventional latex 31 is covered by the soft latex 81. The surface of the substrate is integrated. Among them, the structural features of the substrate surface in which the convex portion 21 exists outside the ink tank 61 due to the formation of the ink tank 61 and the filling of the soft latex 81 can be specifically exhibited in the mask structure of the present invention.

Next, please refer to FIG. 9 , which is a cross-sectional view showing the mask coating ink of FIG. 8 , illustrating that when the screen structure of the present invention is applied to screen printing, for example, an ink scraper 91 can be conveniently taken. Or the ink roller tool is attached to the ink 51, and the ink blade 91 is applied to the screen 41 by applying a pressure, and the ink 51 is capable of being applied by the ink blade 91. Solidly packed in the ink tank 61; accordingly, due to the end portion 21a of the boss portion 21 located outside the ink tank 61, the irregular contour surface thereof has been filled and leveled by the soft latex 81 without voids, so that the ink 51 is only filled in the ink tank 61, and there is no space for the ink 51 to overflow between the groove walls around the ink tank 61, and the ink scraper 91 is applied to the mask 11 at the time of coating. The holes are made more difficult to generate, and therefore, the phenomenon of ink overflow can be effectively prevented. Next, the mask 11 after the ink application is completed, and the steps of exposure, development, and etching are sequentially performed so that the surface of the substrate 20 exhibits the same line pattern as the outline of the channel L on the screen 41.

In summary, the mask preparation method of the present invention provides a set of technical solutions for effectively filling the inner cavity of the mask, and when the screen structure of the present invention is applied to perform screen printing, the overflow can be further effectively avoided. The occurrence of ink phenomena, especially in the application of screen printing of fine line patterns, helps to improve the production yield during printing and contributes to mass production and productivity.

The above embodiments are merely illustrative of several embodiments of the invention, but are not to be construed as limiting the scope of the invention. It should be noted that various modifications and improvements may be made without departing from the spirit and scope of the invention. Therefore, the present invention should be based on the content of the claims defined in the scope of the patent application.

10, 11‧‧‧ mask

20‧‧‧Substrate

21‧‧ ‧ raised parts

21a‧‧‧End

22‧‧‧ Hole

30, 31‧‧‧ conventional latex

40, 41‧‧‧ Screen

50, 51‧‧‧ ink

60, 61‧‧‧ ink tank

70‧‧‧ line graphics

70a‧‧‧ channel

71‧‧‧Ink area

80‧‧‧Latex layer

81‧‧‧Soft Latex

90‧‧‧Scraper

91‧‧‧Ink scraper

L‧‧‧ channel

L1, L2‧‧‧ slot wall

S1 to S5‧‧‧ Description of the steps of the main embodiment

1 is a cross-sectional view of a conventional screen printing mask; FIG. 2 is a top plan view of the screen of FIG. 1; FIG. 3 is a cross-sectional view of the mask of FIG. FIG. 5 is a block diagram of a preparation method of the present invention; FIG. 5 is a block diagram showing the structure of the method shown in FIG. 5; FIG. 7 is a structural view of the preparation method of the present invention; FIG. 8 is a cross-sectional view of a mask prepared in the procedure of FIG. 7; and FIG. 9 is a cross-sectional view of the mask of FIG.

S1 to S4‧‧‧ Description of the steps of the main embodiment

Claims (16)

A method for preparing a mask for screen printing, comprising the step of constructing an ink tank of a line pattern, the step comprising: coating a layer of soft latex, filling the soft latex on a surface of the substrate having roughness; and laying a layer of printing A conventional latex is used to cover the soft latex; a composite screen is formed on the conventional latex to form a mask for screen printing; wherein the soft latex is soft relative to the conventional latex. The method for preparing a mask for screen printing according to the first aspect of the invention, wherein the ink tank is a channel for providing a line pattern by a screen, and a softening latex in the channel is removed by using a removing liquid. Formed with conventional latex. The method for producing a mask for screen printing according to the second aspect of the invention, wherein the removal liquid is at least one aqueous solution containing an alkali metal carbonate, an alkali metal phosphate or an alkali metal hydrazine hydrochloride. The method of producing a mask for screen printing according to the first aspect of the invention, wherein the roughness comprises a protrusion formed by a surface of the substrate. The method for producing a mask for screen printing according to the fourth aspect of the invention, wherein the soft latex is a surface of a substrate having a convex portion other than the ink tank. The method for preparing a screen printing mask according to the first aspect of the invention, wherein the substrate is a glass substrate. The system for screen printing masks as described in claim 1 of the patent application scope The preparation method, wherein the conventional latex is a resin, and the resin is one selected from the group consisting of acrylic resins, vinyl acetal resins, polypropylene, and chlorides thereof. The method for producing a screen printing mask according to claim 1, wherein the soft latex is a resin softer than the conventional latex. The method for preparing a screen printing mask according to claim 8, wherein the resin used for the soft latex is derived from a cellulose ester selected from the group consisting of epoxy resin, polyimine, gelatin, and methylcellulose. One of the materials such as resin. A screen printing mask structure comprising: a substrate having a surface of a substrate having roughness; a latex layer covering the surface of the substrate; a screen, compounded on the latex layer; and a line pattern disposed on the substrate Forming an ink tank between the latex layer and the screen on the surface of the substrate; wherein the latex layer comprises a conventional latex and a soft latex soft relative to the conventional latex, the soft latex being formed outside the ink tank The surface of the substrate is roughened, and the screen is compounded on the conventional latex, and the conventional latex is integrated with the surface of the substrate through the soft latex. The screen printing mask structure according to claim 10, wherein the roughness comprises a convex portion formed on a surface of the substrate. The screen printing mask structure according to claim 11, wherein the soft latex is a substrate surface formed with a convex portion other than the ink tank. The screen printing mask knot as described in claim 10 of the patent application scope The substrate is a glass substrate. The structure of a screen printing mask according to claim 10, wherein the conventional latex is a resin selected from the group consisting of acrylic resin, vinyl acetal resin, polypropylene, and chloride thereof. One of the materials. The screen printing mask structure according to claim 10, wherein the soft latex is a resin softer than the conventional latex. The screen printing mask structure according to claim 15, wherein the resin used for the soft latex is a cellulose ester derivative selected from the group consisting of epoxy resins, polyimine, gelatin, and methylcellulose. One of materials such as resin.