TW201615429A - Composite stencil - Google Patents

Abstract

A composite stencil is described, which includes a metal sheet, a first buffer protection layer and a second buffer protection layer. The metal sheet has a first surface and a second surface opposite to each other, and includes at least one opening region, in which various micro holes are disposed and penetrate the opening region. The first buffer protection layer covers the first surface, in which the first buffer protection layer is set with at least one buffer tank correspondingly exposing the at opening region. The second buffer protection layer covers the second surface, in which the second buffer protection layer is set with at least one printing hole, and the opening region at least exposes a portion of the printing hole correspondingly.

Description

Composite screen

This invention relates to a printing screen, and more particularly to a composite printing screen.

In the current screen printing technology, due to the existence of the wire mesh of the metal mesh in the screen, not only the printing resolution is limited by the wire diameter of the wire, but also the ink input amount and the ink uniformity are difficult to control, thereby resulting in different sizes. It is more difficult to print the fine pattern with the arrangement direction. In order to print a more precise pattern, a mesh with a finer wire diameter is used. However, the structure of the mesh of the fine mesh is relatively fragile, resulting in a shortened service life of the screen.

Since the mesh has its inherent disadvantages, in order to avoid the screen printing process being subject to the mesh, a technique of replacing the mesh with a metal printing template is proposed. In this type of technology, one technique relates to a multi-layer metallization template that forms a metal coating on a diaphragm-shaped electroformed body, wherein the electroformed body has micropores of uniform size and equidistant array arrangement, metal covering The layer covers a portion of the micropores and has at least one hollowed out region. This technology replaces the conventional screen printing mesh fabric with an electroformed body and replaces the conventional screen printing photosensitive emulsion with a metal coating.

In this technique, since the multi-layer metal printing template has a uniform thickness, the interlaced thickness of the fabric produced by the thick film screen printing can be solved. The problem is poor, and the film formed by printing can be made more uniform and thin, and also has good process reproducibility. Moreover, the metal cover layer is inexpensive to manufacture and has a flat exposed pressure surface. However, since the doctor blade is in direct contact with the electroformed body at the time of squeegee printing, the electroformed body is extremely liable to be damaged. In addition, the structure of the metal printing template is insufficient in the printing of the film structure, and the applicability is limited. Moreover, the resolution of this metal printing template on precision printing is still insufficient.

Another technique relates to a composite metal face printing stencil that forms an emulsion layer on a metal mold having a mesh layer and a single layer structure. The metal die has a line slot, and a plurality of bridge components are integrally connected to both sides of the line slot to maintain the line slot at the fixed hole width. The emulsion layer is formed on the attachment surface of the metal mold and partially extends into the line slot to cover both ends of the bridge member, thereby preventing breakage of the bridge member and peeling of the emulsion layer. This technique replaces the conventional screen printing web fabric with a metal mold and replaces the conventional screen printing photosensitive emulsion with an emulsion layer.

In this technique, the design of the bridge element is used to strengthen the line slot to maintain the hole width of the line slot, so that the line slot deformation can be avoided when the composite metal surface printing template is pulled apart. In addition, under the barrier of the emulsion layer, the bridge element and the metal die do not directly contact the workpiece to be printed, and the coating material under the bridge component can be filled in, so that a thick and continuous precision circuit coating can be printed. . However, the strength of the bridge structure of the metal mold is insufficient, and the ultra-precision pattern cannot be printed due to the weak strength of the structure of the bridge.

Accordingly, it is an object of the present invention to provide a composite screen comprising a metal sheet and a two buffer protective layer overlying opposite surfaces of the metal sheet, wherein the buffer layer is provided with a printing ink in the buffer layer above the metal sheet The buffer hole groove, the metal piece is provided with an opening area with a variable opening ratio, and the buffer protection layer under the metal piece is provided with a printing opening. By designing the aperture ratio of the metal sheet, patterns of different sizes can be printed, and the efficiency, uniformity, and resolution of the ink can be improved. In this way, even if the size of the printing opening is small, the printing can be smoothly completed with the ink feeding efficiency improved.

Another object of the present invention is to provide a composite screen which is attached to the upper and lower surfaces of the metal sheet and which can sandwich the metal sheet and naturally flatten the metal sheet, so that no additional web can be used. Printing, so as to avoid the problem of printing opening deformation caused by the screen of the conventional screen.

Another object of the present invention is to provide a composite screen having a cushioning protection layer on the metal sheet, so that the printing blade does not directly contact the metal sheet, and the metal sheet can be greatly reduced during printing. The force can prevent the scraper from damaging the fine structure of the metal sheet and greatly extend the service life of the screen.

Still another object of the present invention is to provide a composite screen having a three-layer composite structure which can increase the strength of the screen, so that the size of the printing opening can be designed to be smaller, and the purpose of printing a more precise pattern can be achieved.

According to the above object of the present invention, a composite screen is proposed. The composite screen comprises a metal sheet, a first buffer protection layer and a second buffer protection layer. The metal sheet has opposite first and second surfaces and includes at least one open area, wherein the open area is provided with a plurality of micro holes. First buffer The cover layer covers the first surface, wherein the first buffer protection layer is provided with at least one buffer hole groove corresponding to exposing the aforementioned opening area. The second buffer protection layer covers the second surface, wherein the second buffer protection layer is provided with at least one printing opening, and the aforementioned opening area at least correspondingly exposes a portion of the printing opening.

According to an embodiment of the invention, the material of the metal sheet is nickel, a nickel alloy or stainless steel.

According to another embodiment of the invention, the microholes described above have a plurality of geometric shapes.

According to still another embodiment of the invention, the microholes have a single geometry.

In accordance with still another embodiment of the present invention, the geometry of each of the microholes described above comprises a square, a diamond, a triangle, or a polygon.

According to still another embodiment of the present invention, in the above-mentioned opening area, the micro holes have different pitches.

According to still another embodiment of the present invention, the number of the opening areas is plural, and the micro holes in each of the opening areas have the same geometry, and the micro holes in the metal piece have at least two kinds of geometry. shape.

According to still another embodiment of the present invention, the first buffer protection layer and the second buffer protection layer are polymer material layers.

According to still another embodiment of the present invention, the first buffer protection layer and the second buffer protection layer are latex layers.

According to still another embodiment of the present invention, the buffer hole groove completely exposes the corresponding opening area.

According to still another embodiment of the present invention, the opening area is larger than corresponding Printing holes.

100‧‧‧Composite screen

102‧‧‧metal pieces

104‧‧‧First buffer protection layer

106‧‧‧Second buffer protection layer

108‧‧‧ first surface

110‧‧‧ second surface

112‧‧‧opening area

114‧‧‧opening area

116‧‧‧Micropores

118‧‧‧Micropores

120‧‧‧buffer slot

122‧‧‧buffer slot

124‧‧‧Printing holes

126‧‧‧Printing holes

128‧‧‧Substrate

130‧‧‧ surface

200‧‧‧Mesh

202‧‧‧ steel wire

204‧‧‧ corner pattern

300‧‧‧metal pieces

302‧‧‧Ink hole

304‧‧‧ corner pattern

The above and other objects, features, advantages and embodiments of the present invention will become more <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; Stereoscopic view.

2 is a perspective view showing a metal plate of a composite screen according to an embodiment of the present invention.

3 is a perspective view showing a first high buffer protection layer of a composite screen according to an embodiment of the present invention.

4 is a perspective view showing a second buffer protective layer of a composite screen according to an embodiment of the present invention.

5A to 5D are cross-sectional views showing a process of a composite screen according to an embodiment of the present invention.

Figure 6 is a schematic view showing the ink-injecting structure and the corner pattern of a conventional screen.

Figure 7 is a schematic view showing an ink-injecting structure and a corner pattern of a variable aperture metal sheet according to an embodiment of the present invention.

In view of the current bottleneck in printing size, the present invention proposes a sandwich-type composite screen comprising a two-buffer protective layer and a metal sandwiched between the two buffer layers. sheet. With such a sandwich structure design, the intermediate metal piece can be greatly reduced The force exerted on the screen printing, and thus the composite screen can be applied to the printing of fine patterns. Secondly, through the design of the preferred ink opening ratio of the metal sheet, the resolution of the printing can be effectively improved, and the printing size can be reduced. Moreover, the two buffer protection layers act as a printing surface and a buffer protection structure, thereby effectively extending the service life of the screen.

Please refer to FIG. 1 , which is a perspective view of a composite screen according to an embodiment of the present invention. In the present embodiment, the composite screen 100 can be applied to printing of a pattern structure, such as printing of a pattern structure of a wiring layout of a semiconductor element. In some embodiments, the composite screen 100 mainly includes a metal sheet 102, a first buffer protection layer 104 and a second buffer protection layer 106, wherein the metal sheet 102 is sandwiched between the first buffer protection layer 104 and the second buffer protection layer. Between 106, and form a sandwich structure.

Please refer to FIG. 2, which is a perspective view of a metal plate of a composite screen according to an embodiment of the present invention. The metal sheet 102 has a first surface 108 and a second surface 110, wherein the first surface 108 and the second surface 110 are respectively located on opposite sides of the metal sheet 102. The metal piece 102 can be fabricated by electroforming. Further, the material of the metal piece 102 may be, for example, nickel, a nickel alloy, or stainless steel. Metal sheet 102 includes one or more open areas, such as open areas 112 and 114, as shown in Figures 1 and 2. The aperture regions 112 and 114 are respectively provided with a plurality of microholes 116 and 118, wherein the microholes 116 and 118 extend through the metal sheet 102, i.e., from the first surface 108 of the metal sheet 102 to the second surface 110.

The geometry of the microholes 116 and 118 can comprise, for example, a square, a diamond, a triangle, or a polygon. In a specific example, the microwells 116 and 118 The geometry can be circular or elliptical. However, in the present embodiment, the geometry of the microholes 116 and 118 is preferably non-circular or non-elliptical to reduce the viscous force of the printing ink as it passes through the microholes 116 and 118. In some examples, the micropores 116 of the open cells 112 have a single geometry, and the microwells 118 of the open regions 114 have a single geometry, ie, all of the micropores 116 in the open regions 112 have the same geometry and are open All of the microholes 118 in the region 114 have the same geometry. In such an example, the geometry of the apertures 116 of the apertured regions 112 may be the same as or different from the geometry of the apertures 118 of the apertured regions 114, as shown in FIG.

In other examples, the apertures 116 of the apertured region 112 have a plurality of geometries, and the apertures 118 of the apertured region 114 have a plurality of geometric shapes. In such an example, the geometry of the microholes 116 in the apertured region 112 can be different (i.e., all different), or some of the microholes 116 can be of the same geometry, with portions of the microholes 116 having different geometries. Similarly, the geometry of the microholes 118 in the apertured region 114 can be different, or the geometry of a portion of the microholes 118 can be the same, while the geometry of a portion of the microholes 118 can be different.

In still other examples, the apertures 116 of the apertured regions 112 have a single geometry, while the apertures 118 of the apertured regions 112 have a variety of geometries. Alternatively, the apertures 116 of the aperture region 112 have a plurality of geometries, and the apertures 118 of the aperture region 112 have a single geometry. In an exemplary embodiment, all of the microholes 116 and 118 of the metal sheet 102 have at least two geometries.

Moreover, in the aperture region 112, the microholes 116 can have the same pitch, i.e., the distance between any two adjacent microholes 116 is equal. The micropores 116 in the opening region 112 may also have various spacings, that is, the distance between the adjacent two micro holes 116. The distance between the micropores 116 may be the same, or the spacing between the micropores 116 of the other portions may be the same. Likewise, in the aperture region 114, the microholes 118 can have the same spacing, i.e., the distance between any two adjacent apertures 118 is equal. The microholes 118 in the opening region 114 may also have a plurality of spacings, that is, the distance between the adjacent two microholes 118 may be different, or the spacing between the partial microholes 118 may be the same, and the other portion of the microholes 118 The spacing between them is different. In some examples, when the micropores 116 of the open cells 112 have the same pitch and the microwells 118 of the open regions 114 have the same pitch, the spacing between the micropores 116 can be the same as the spacing between the microwells 118. Or it can be different.

Please refer to FIG. 1 and FIG. 3 simultaneously. FIG. 3 is a perspective view showing a first buffer protection layer of a composite screen according to an embodiment of the present invention. The first buffer protection layer 104 overlies the first surface 108 of the metal sheet 102. The first buffer protection layer 104 may be composed of a material having elasticity. In some examples, the first buffer protection layer 104 may be a polymer material layer. For example, the first buffer protection layer 104 can be a latex layer, such as an optical emulsion layer. The first buffer protection layer 104 has one or more buffer holes, such as the buffer holes 120 and 122, wherein the buffer holes 120 and 122 respectively expose the opening areas 112 and 114 of the metal piece 102. In some examples, the buffer holes 120 and 122 completely expose the corresponding opening areas 112 and 114, respectively. In the composite screen 100, the buffer holes 120 and 122 of the first buffer protection layer 104 can provide a buffer space for accommodating printing ink, that is, the printing ink can be first accommodated in the buffer holes 120 and 122 during printing. The middle portion is further dropped through the micropores 116 and 118 of the lower metal piece 102.

Please refer to both Figure 1 and Figure 4, where Figure 4 shows A perspective view of a second buffer protective layer of a composite screen according to an embodiment of the present invention. The second buffer protection layer 106 covers the second surface 110 of the metal sheet 102. At the time of printing, the composite screen 100 is attached to the object to be printed with the second buffer layer 106, so that in order to prevent the printing ink from spreading outward through the contact interface between the second buffer layer 106 and the object to be printed, The second buffer protection layer 106 is preferably made of a material having elasticity to be tightly pressed against the object to be printed. In some examples, the second buffer protection layer 106 can be a polymer material layer. For example, the second buffer protection layer 106 can be a latex layer, such as an optical emulsion layer. The second buffer protection layer 106 has one or more printing apertures, such as a plurality of printing apertures 124 and a plurality of printing apertures 126. Print openings 124 and 126 are open-cell structures having a pattern to be printed through which printing inks 124 and 126 are printed. In the embodiment shown in FIG. 1, the print openings 124 are arranged in one of the second buffer protection layers 106, and the print openings 126 are arranged in the other of the second buffer protection layer 106.

In the embodiment shown in FIG. 1, the opening area of the metal piece 102 112 and 114 correspond to the print openings 124 and 126, respectively. Since the opening areas 112 and 114 of the metal piece 102 correspond to the buffer holes 120 and 122 of the first buffer protection layer 104, respectively, and the opening areas 112 and 114 correspond to the printing openings 124 and 126, respectively, the first buffer The buffer holes 120 and 122 of the protective layer 104 also correspond to the printing openings 124 and 126 of the second buffer protection layer 106, so that the printing ink can be sequentially passed through the buffer holes 120 and 122 and the corresponding micro holes 116 and 118, respectively. And smoothly fall into the printing openings 124 and 126, and then print to the printing to be printed via the printing openings 124 and 126. On the object.

In some examples, the aperture regions 112 and 114 are larger than the corresponding print apertures 124 and 126. The micropores 116 of the opening region 112 and the microholes 118 of the opening region 114 respectively expose at least a portion of the corresponding printing openings 124 and 126. The geometry of the apertures 116 of the apertured regions 112 can be different than the geometry of the printed apertures 124, and the geometry of the apertures 118 can be different than the geometry of the printed apertures 126. In a particular example, the microholes 116 can have the same geometry as the printing apertures 124, but the microholes 116 are smaller in size than the printing apertures 124; and the microholes 118 can have the same geometry as the printing apertures 126, but The aperture 118 is smaller in size than the printed aperture 126. The print apertures 124 and 126 may be sized larger, equal to or smaller than the dimensions of the corresponding microholes 116 and 118.

Printing scraper when using the composite screen 100 for the screen printing process The ink is scraped on the first buffer protective layer 104, and the printing ink is scraped into and filled with the buffer holes 120 and 122 of the first buffer protective layer 104. The printing ink in the buffer holes 120 and 122 is then dropped into the micro holes 116 of the corresponding opening portion 112 of the lower metal piece 102 and the micro holes 118 of the opening portion 114 via the push of the doctor blade. The ink in the micropores 116 and 118 of the metal sheet 102 then enters the printing openings 124 and 126 in the second buffer protective layer 106 by the pushing of the upper ink and the gravity of the ink, and is printed from the printing openings 124 and 126. To the printed matter, the pattern of printing openings 124 and 126 is transferred to the object to be printed.

Since the first buffer protection layer 104 can directly withstand the application of the doctor blade The printing stress protects the underlying metal sheet 102 and the second buffer protective layer 106, thereby avoiding the pattern in the metal sheet 102 and the second buffer protective layer 106 The structure of the case is damaged by the scraper, and the purpose of extending the service life of the composite screen 100 can be achieved. Moreover, the buffer holes 120 and 122 can also enhance the ink inking effect of the printing ink.

Secondly, the metal piece 102 is a metal foil of variable opening ratio, and According to the optimized design of the pattern and size of the printing openings 124 and 126 of the second buffer protection layer 106, the opening ratio of the metal sheet 102 is adjusted, thereby enabling the ink to smoothly and uniformly enter the ink when printing different scales and patterns. Improve the uniformity of ink and the effect of ink intake. Under the improvement of ink-input efficiency, the composite screen 100 can also successfully print a fairly precise pattern. In some examples, the opening ratio of the metal piece 102 can be adjusted by providing micro holes 116 and 118 of different geometric shapes, different opening sizes, and/or different opening pitches in the metal piece 102. Print resolution.

In addition, in order to meet the requirements of more compact printing size, The size of the micropores 116 of the opening portion 112 of the metal piece 102 and the micro holes 118 of the opening portion 114 are also more miniaturized, which will cause the ink in the holes 116 and 118 to be less likely to enter the ink. However, the ink storage effect provided by the buffer holes 120 and 122 of the first buffer protection layer 104 can increase the ink input efficiency of the micro holes 116 and 118 during the squeegeing process, thereby making the composite screen 100 more Suitable for precision and miniaturized pattern printing.

Furthermore, since the composite screen 100 is made of the first buffer layer 104 and the second buffer protection layer 106 are sandwiched between the metal sheets 102, so that the strength of the composite screen 100 can be increased. Due to the increase in the strength of the composite screen 100, the size of the openings or slots of each layer can be designed to be smaller, and the precise pattern of printing can be achieved.

Please refer to FIG. 1 to FIG. 5D together, wherein FIG. 5A to FIG. 5D are cross-sectional views showing a process of a composite screen according to an embodiment of the present invention. In some embodiments, when the composite screen 100 as shown in Fig. 1 is produced, the metal sheet 102 as shown in Fig. 2 can be prepared according to the printing pattern and the desired opening ratio. Next, as shown in FIG. 5A, the metal piece 102 is fixed on the surface 130 of the substrate 128. The surface 130 of the substrate 128 is a flat surface to control the thickness of the subsequently formed second buffer protection layer 106 and the first buffer protection layer 104.

Next, a buffer protective layer is formed over the second surface 110 of the metal sheet 102 by, for example, a coating method. Referring to FIG. 5B, the buffer protective layer is patterned by, for example, lithography and etching techniques to remove a portion of the buffer protective layer, and the printed openings 124 and 126 are formed on the second surface 110 of the metal sheet 102. The second buffer protection layer 106 is as shown in FIG. In some examples, when the buffer protective layer is made of a photosensitive material such as a photoresist, a printed pattern composed of the printing openings 124 and 126 can be directly defined on the buffer protective layer by lithography. As shown in FIGS. 1 and 5B, the positions of the printing openings 124 and 126 of the second buffer protection layer 110 correspond to the micro holes 116 of the opening portion 112 of the metal piece 102 and the micro holes 118 of the opening portion 114, respectively. .

In the present embodiment, the opening of the metal sheet 102 is designed to increase the opening ratio of the printing surface of the second buffer layer 110. Depending on the pattern to be printed, the printed openings 124 and 126 of the second buffer layer 110 may be greater than, equal to, or less than the corresponding microholes 116 and 118 of the metal sheet.

After the fabrication of the second buffer protection layer 106 is completed, as shown in FIG. 5C The double layer structure composed of the metal sheet 102 and the second buffer protection layer 106 is detached from the surface 130 of the substrate 128 to expose the first surface 108 of the metal sheet 102.

Next, another layer of buffer protective layer is formed overlying the first surface 108 of the metal sheet 102 by, for example, coating. Referring to FIG. 5D, the buffer protective layer is patterned by using, for example, lithography and etching techniques to remove a portion of the buffer protective layer, and a buffer hole 120 is formed on the first surface 108 of the metal sheet 102. The first buffer protection layer 104 of 122 is as shown in FIG. So far, the production of the composite screen 100 shown in Fig. 1 has been substantially completed. Similarly, when the buffer protective layer is made of a photosensitive material such as a photoresist, the buffer holes 120 and 122 can be directly defined on the buffer protective layer by lithography. As shown in FIGS. 1 and 5D, the positions of the buffer holes 120 and 122 of the first buffer protection layer 108 correspond to the micro holes 116 of the opening portion 112 of the metal piece 102 and the micro holes 118 of the opening portion 114, respectively. And the printing openings 124 and 126 of the second buffer protection layer 110 correspond to the printing ink, respectively, through the buffer hole 120, the micro hole 116 and the printing opening 124, and the buffer hole 122, the micro hole 118 and the printing The opening 126 is printed on the object to be printed.

Please refer to FIG. 6 and FIG. 7 simultaneously, which are respectively a schematic diagram of an ink-injecting structure and a corner pattern of a conventional screen and an ink-injecting structure of a variable aperture metal sheet according to an embodiment of the present invention. Schematic diagram with a corner pattern. As shown in Fig. 6, the conventional screen printing system uses the woven screen 200 as an ink inlet, but the screen 200 is woven by a plurality of steel wires 202, and in order to maintain the tension of the screen 200, Each steel line 200 Must be kept intact. Therefore, the wire diameter of the steel wire 202 of the screen 200 affects the ink entering of the structure of the fine pattern and the specific direction pattern. In the schematic diagram of the combination of the screen 200 and the corner pattern 204 shown in Fig. 6, it can be seen that the opening ratio is greatly lowered due to the blocking of the steel wire 202, and some corner regions in the corner pattern 204 are obviously affected by The steel wire 202 is blocked and cannot be inked.

In another aspect, in an embodiment of the invention, as in Figure 7, It is shown that the metal sheet 300 has no problem with the web, and different aperture sizes and directions can be designed for the pattern to be printed, such as the corner pattern 304. Further, in the metal piece 300, except for the area where the ink is supplied, it is necessary to open the ink supply hole 302, and the remaining area may be a solid ink-impermeable area. As a result, the strength of the metal piece 300 is significantly increased compared to the woven screen 200, so that the composite screen of the embodiment can achieve printing with a finer line width ratio. In addition, the metal sheet 300 can be designed with a higher opening ratio for certain key fine patterns, thereby increasing the resolution of printing.

It can be seen from the above embodiments that one of the advantages of the present invention is that The composite screen of the present invention comprises a metal sheet and two buffer protection layers disposed on opposite surfaces of the metal sheet, wherein the buffer protection layer above the metal sheet is provided with a buffer hole for printing ink, and the metal sheet is provided with The opening area of the open porosity, the buffer protection layer under the metal piece is provided with a printing opening. Therefore, by designing the aperture ratio of the metal piece, patterns of different sizes can be printed, and the efficiency, uniformity, and resolution of the ink can be improved. Thus, even if the size of the printing opening is small, the printing can be smoothly completed in the case where the ink-in efficiency is improved.

It can be seen from the above embodiments that another advantage of the present invention is that In the composite screen of the present invention, the buffer protective layer attached to the upper and lower surfaces of the metal sheet can sandwich the metal sheet, and the metal sheet is naturally flattened, so that it can be used for printing without additional sheets, so that it can be avoided. The problem of printing hole deformation caused by the net is caused by the net.

According to the above embodiments, another advantage of the present invention is that because the metal screen of the composite screen of the present invention has a cushioning protection layer on the metal sheet above, the printing blade does not directly contact the metal sheet, and can be greatly reduced. The force that the metal piece receives during printing can prevent the blade from damaging the fine structure of the metal piece and greatly extend the service life of the screen.

It can be seen from the above embodiments that another advantage of the present invention is that the three-layer composite structure of the composite screen of the present invention can increase the strength of the screen, so that the size of the printing opening can be designed to be smaller, and the printing can be further improved. The purpose of precision patterns.

While the present invention has been described above by way of example, it is not intended to be construed as a limitation of the scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

100‧‧‧Composite screen

102‧‧‧metal pieces

104‧‧‧First buffer protection layer

106‧‧‧Second buffer protection layer

108‧‧‧ first surface

110‧‧‧ second surface

112‧‧‧opening area

114‧‧‧opening area

116‧‧‧Micropores

118‧‧‧Micropores

120‧‧‧buffer slot

122‧‧‧buffer slot

124‧‧‧Printing holes

126‧‧‧Printing holes

Claims (11)

A composite screen comprising: a metal sheet having a first surface and a second surface opposite to each other, and comprising at least one opening area, wherein the opening area is provided with a plurality of micro holes; a first buffer a protective layer covering the first surface, wherein the first buffer protection layer is provided with at least one buffer hole corresponding to exposing the opening area; and a second buffer protection layer covering the second surface, wherein The second buffer protection layer is provided with at least one printing opening, and the opening area at least correspondingly exposes a portion of the printing opening. The composite screen of claim 1, wherein the metal sheet is made of nickel, nickel alloy or stainless steel. The composite screen of claim 1, wherein the micropores have a plurality of geometric shapes. The composite screen of claim 1, wherein the micropores have a single geometry. The composite screen of claim 1, wherein one of the plurality of micropores comprises a square, a diamond, a triangle or a polygon. The composite screen of claim 1, wherein the microholes have different numbers of spaces in the aperture region. The composite screen as claimed in claim 1, wherein the number of the opening areas The plurality of microholes have the same geometry, and the micropores of the metal sheet have at least two geometric shapes. The composite screen of claim 1, wherein each of the first buffer protection layer and the second buffer protection layer is a polymer material layer. The composite screen of claim 1, wherein each of the first buffer protection layer and the second buffer protection layer is a latex layer. The composite screen of claim 1, wherein the buffer hole groove completely exposes the corresponding opening area. The composite screen of claim 1, wherein the opening area is larger than the corresponding printing opening.