TWM449701U - Structure of screen printing mask - Google Patents

Abstract

The present invention provides a structure of screen printing mask comprises a latex layer is coated up on a roughened substrate surface, a stencil is coved up on the latex layer, a circuit diagram is arranged between the latex layer and the stencil, so that a printing-ink slot is formed on the substrate surface; therein, the latex layer includes a soft latex and a conventional latex, the soft latex is more soft relative to the conventional latex, the soft latex is formed on the substrate surface of an outside of the printing-ink slot, the stencil is coved up on the conventional latex, the conventional latex is via the soft latex to cover the substrate surface integrated, so as to provide uses in screen printing process of fine circuit diagram.

Description

Mask structure for screen printing

The present invention relates to the technical field of screen printing, and in particular to a mask structure for screen printing.

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 The surface is not flat under the microscopic, plus the layout design of the line graphic 70 has been As the tendency toward refinement and complication is gradually increasing, when the minute projections 21 on the substrate 20 are present critically at the edges of the ink tank 60, the ink 50 packed in the ink tank 60 is susceptible to the projections 21 The voids form voids 22; since these voids 22 are located at the edges of the ink tank 60, they are often easily communicated with the ink tank 60, resulting in pressure application and immersion of the ink 50 in the ink tank 60. Frequently overflowing into the cavity 22 outside the ink tank 60, and then overflowing occurs; referring to FIG. 4, a schematic top view of a conventional mask-made circuit pattern is disclosed, illustrating the circuit pattern in the example shown in FIG. The ink overflow area 71 existing in 70 is caused by the phenomenon of ink overflow. 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 this, the present invention improves the preparation procedure of the screen printing mask to solve the problem that the substrate surface is uneven and causes ink overflow during printing.

According to an embodiment of the present invention, a mask structure prepared by the above preparation process is provided, comprising: a substrate having a surface of a substrate having roughness; a latex layer covering the surface of the substrate; a screen, composite On the latex layer; a line pattern disposed between the latex layer and the screen to form an ink tank on the surface of the substrate; wherein the latex layer comprises a conventional latex and a soft softness relative to the conventional latex The latex is formed on the surface of the substrate having roughness outside the ink tank, 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.

Further, the roughness comprises a raised portion formed on a surface of the substrate. Further, wherein the soft latex is a substrate surface formed with a convex portion outside 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 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; wherein, FIG. 5 discloses a block flow chart of the creation preparation program, and FIGS. 6a to 6d are structural sectional views respectively corresponding to the flow shown in FIG. The above embodiment illustrates an embodiment of the present invention for providing a preparation process for a screen printing mask. In the present embodiment, a touch panel to which a line pattern is attached is exemplified for the purpose of implementing the creation program. That is, it is possible to overcome the problem that the surface of the substrate is uneven. As shown in FIG. 5, the program 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 the sheet-like conventional latex 31; since the substrate 20 having roughness is subjected to the above step S2 Generally, it has been leveled, so that when the conventional latex 31 is disposed, the sheet-like conventional latex 31 can be flatly hot-pressed on the soft latex 81 by, for example, lamination processing; wherein, it is located on the surface of the substrate and The soft latex 81 between the conventional latexes 31 provides excellent adhesion during lamination, and, in addition, the force applied during lamination processing ensures that the conventional latex 31 can adhere more firmly to the substrate 20 The surface, in particular the solid contoured surface of the raised portion 21, is attached in solid form.

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 for 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 contains ink to be packed and adhered to the inlet on the substrate 20.

Further, the creation further includes step S5: constructing an ink tank.

Please refer to FIG. 7 and FIG. 8 in combination; FIG. 7 is a schematic diagram showing the creation of an ink tank on the mask, and FIG. 8 is a cross-sectional view showing the screen printing mask 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. L, in order to simultaneously wash out the inside of the channel L The conventional latex 31 and the soft latex 81 are further constructed to form an ink tank 61 which is inside the channel L and which is concave, wherein the groove bottom of the ink tank 61 reveals the surface of the substrate in contrast to the contour of the channel.

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 the conventional latex 31 and the soft latex 81 inside the channel L are washed away by the resin removing liquid, the mask 11 can be washed by water or acid, and the action of washing the resin is immediately stopped. 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, and the surface of the uneven substrate is completely Further, the above-exemplified resin material can also be previously formed into a sheet-like film by a film forming process 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 procedure, 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. The channel L of the line pattern is disposed between the latex layer 80 and the screen 41 to form an ink tank 61 on the surface of the substrate 20. 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. Wherein, due to the formation of the ink tank 61, and filling the soft The structural features of the substrate surface in which the convex portion 21 is present outside the ink tank 81 and the ink tank 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 is applied to the screen printing, an ink scraping blade 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 force applied to the mask 11 by the ink scraper 91 at the time of coating is added. 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 program of the present invention provides a set of technical solutions for effectively filling the inner cavity of the mask, and the mask structure of the present invention is applied to the screen printing to further effectively avoid overflow. 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 implementations of the present invention, but are not to be construed as limiting the scope of the present invention. It should be noted that for those of ordinary skill in the art to which this creation belongs, Without departing from the original concept of the creation, complex transformations and improvements can be made, which are within the scope of this creation. Therefore, this creation should be based on the content of the request as 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 schematic diagram of the creation process; FIG. 5 is a block diagram of the flow of the process shown in FIG. 5; FIG. 7 is a schematic diagram of the process of the creation process of FIG. 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.

11‧‧‧ mask

20‧‧‧Substrate

21‧‧ ‧ raised parts

21a‧‧‧End

31‧‧‧Conventional Latex

41‧‧‧ Screen

61‧‧‧ ink tank

80‧‧‧Latex layer

81‧‧‧Soft Latex

L‧‧‧ channel

Claims (8)

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 1, wherein the roughness comprises a convex portion formed on a surface of the substrate. The screen printing mask structure according to claim 2, wherein the soft latex is a substrate surface formed with a convex portion other than the ink tank. The mask structure for screen printing according to claim 1, wherein the substrate is a glass substrate. The screen printing mask structure according to claim 1, wherein the conventional latex is a resin. The structure of a screen printing mask according to claim 5, wherein the resin used in the conventional latex is one selected from the group consisting of acrylic resin, vinyl acetal resin, polypropylene, and chloride thereof. . The screen printing mask structure according to claim 5, wherein the soft latex is a resin softer than the conventional latex. The mask structure for screen printing according to claim 7, 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.