Screen printing plate with stress release area

Abstract

A screen printing plate with a stress release area comprises a screen frame and screen cloth arranged in the screen frame, the screen cloth comprises a graphic area and a peripheral area annularly arranged on the graphic area, the peripheral area comprises a structure supporting area and a stress release area, the structure supporting area has a first elastic coefficient, the stress release area has a second elastic coefficient, and the first elastic coefficient is larger than the second elastic coefficient. The second elastic coefficient is smaller than the first elastic coefficient.

Description

Technical Field

[0001] The present disclosure relates to a structure of a printing screen, and in particular to a printing screen with a stress release area. Background Art

[0002] The known printing screen mainly includes a screen frame and a mesh cloth. When printing, an emulsion layer is coated on the mesh cloth, and after a pattern opening is set in the emulsion layer, the screen cloth is pressed down and scraped back and forth by a scraper on the printing machine, so that the ink is squeezed and passes through the pattern opening to be printed on the printed object, thereby printing the required printed circuit or printed pattern. The mesh cloth of the printing screen generally adopts a mesh structure formed by interlacing the warp and weft of yarns of the same material or different materials, so there will be a connecting bracket with interlaced warp and weft at the pattern opening. When printing through such a printing screen, the connecting bracket in the pattern opening will affect the ink penetration, making the printed pattern incomplete.

[0003] In view of the above situation, in the prior art, the yarns in the pattern openings are removed, or metal foil is used to replace the mesh structure to produce a screen with fewer connected brackets in the pattern openings or a completely open screen with no connected brackets in the pattern openings. By using such a screen with fewer connected brackets in the pattern openings or a completely open screen with no connected brackets in the pattern openings, printed circuits or printed graphics with relatively complete graphic lines can be printed.

[0004] However, screens with fewer connected brackets in the pattern openings or screens with completely open pattern openings without connected brackets lack sufficient support structures, and the stress applied by the scraper to the screen during printing will cause the pattern opening to deform and cause the printed lines to expand. In addition, when a metal foil is used to replace a mesh-structured screen for printing, in order to prevent the stress applied by the scraper to the screen during printing from causing the pattern opening to deform, in the prior art, multiple openings are opened on the side of the metal foil so that when the scraper applies stress to the screen during printing, the side openings of the metal foil can be expanded to share the deformation of the pattern opening. However, in this way, ink will overflow from the openings set on the metal foil during printing, resulting in ink leakage, affecting the printing quality, and the expanded openings may not be able to return to the original state, affecting the service life of the screen. Summary of the invention

[0005] In order to solve the problem of line expansion or ink leakage in the known technology when printing with a screen with fewer connecting brackets in the pattern opening or a completely opened printing screen with no connecting bracket in the pattern opening, and improve the printing quality, the present invention provides a printing screen, including a screen frame and a mesh cloth arranged in the screen frame, the mesh cloth includes a graphic area and a peripheral area arranged around the graphic area, the peripheral area includes a structural support area and a stress release area, wherein the structural support area has a first elastic coefficient, and the stress release area has a second elastic coefficient, and the second elastic coefficient is smaller than the first elastic coefficient.

[0006] In one embodiment, the difference between the first elastic coefficient and the second elastic coefficient is greater than 150 MPa.

[0007] In one embodiment, the second elastic coefficient is between 150 MPa and 1100 MPa.

[0008] In one embodiment, the material of the pattern area includes metal or polymer material.

[0009] In one embodiment, the pattern area is in the form of a sheet or a mesh.

[0010] In one embodiment, the structural support area is a mesh structure.

[0011] In one embodiment, the stress release region is a mesh structure or a film layer.

[0012] In one embodiment, the material of the stress release area is a thermoplastic polymer.

[0013] In one embodiment, the thermoplastic polymer is selected from the group consisting of polyethylene, hot melt adhesive, thermoplastic polyurethane, polyolefin and thermoplastic polyester elastomer.

[0014] In one embodiment, the stress release region is located on two opposite sides of the pattern region.

[0015] In one embodiment, the stress release area is disposed in the structural support area and is not adjacent to the graphic area and the screen frame.

[0016] In one embodiment, the stress release area is disposed in the structural support area and is adjacent to the graphic area and / or the screen frame.

[0017] The present invention effectively disperses the stress applied by the scraper to the screen during printing by setting a stress release area with a smaller elastic coefficient than the structural support area in the peripheral area of ​​the mesh, thereby avoiding the situation where the pattern opening in the pattern area of ​​the mesh is deformed due to force and causes the printing line to expand. In addition, due to the setting of the stress release area of ​​the present invention, it is not necessary to set an additional opening for supplying force release in the metal foil, which fundamentally avoids the possibility of ink leakage caused by the overflow of the additional opening set on the metal foil during printing, thereby improving the printing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of a stress release area disclosed in the present invention that is only arranged on one side of the peripheral area of ​​the mesh.

[0019] Figure 2 This is another structural schematic diagram in which the stress release area of ​​the present invention is only arranged on one side of the peripheral area of ​​the mesh.

[0020] Figure 3It is a schematic structural diagram of a plurality of stress release areas disclosed in the present invention, which are respectively arranged on two opposite sides of the peripheral area of ​​the mesh.

[0021] Figure 4 It is a schematic structural diagram of the stress release area disclosed in the present invention, which is only arranged on one side of the peripheral area of ​​the mesh and is adjacent to the graphic area.

[0022] Figure 5 It is a schematic structural diagram of the stress release area disclosed in the present invention, which is only arranged on one side of the peripheral area of ​​the mesh and is adjacent to the mesh frame.

[0023] The reference numerals are as follows:

[0024] 100: Printing screen

[0025] 1: Screen frame

[0026] 2: Mesh

[0027] 21: Graphics area

[0028] 22: Outlying Area

[0029] 221: Structural support area

[0030] 222a, 222b, 222c, 222d, 222e: stress relief area DETAILED DESCRIPTION

[0031] The following embodiments are described in detail with the accompanying drawings, but the specific embodiments described are only used to explain the present invention and are not used to limit the present invention. The description of the structural operation is not used to limit the order of its execution. Any structure recombined by the elements to produce a device with equal efficacy is within the scope of the disclosure of the present invention. The directional terms mentioned in the present invention, such as "upper" and "lower", are only with reference to the directions of the attached drawings. Therefore, the directional terms used are only used to illustrate and understand the present invention, not to limit the present invention. In addition, the drawings are only used for schematic illustration and are not drawn according to their actual size.

[0032] The terms used throughout the specification and claims generally have the ordinary meaning of each term used in the art, in the context of this disclosure, and in the specific context, unless otherwise noted. Certain terms used to describe the present disclosure will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art on the description of the present disclosure.

[0033] Figure 1The figure is a schematic diagram of an embodiment of the printing screen 100 of the present invention, and the printing screen 100 of the present invention comprises a screen frame 1 and a mesh 2 disposed in the screen frame 1. The mesh 2 is a composite screen composed of different materials, and comprises a graphic area 21 and a peripheral area 22 arranged around the graphic area 21. The graphic area 21 is an area for opening a graphic opening. When printing, a printing material such as ink (not shown in the figure) is placed on the graphic area 21, and a scraper (not shown in the figure) is pressed down and scraped back and forth to force the printing material to pass through the graphic opening and further be printed on the printed object (not shown in the figure). The graphic area 21 can be, for example, a sheet-like structure made of metal, polymer material, inorganic material or a mixed material thereof, or a mesh structure formed by interlacing warp and weft of yarns.

[0034] The peripheral area 22 includes a structural support area 221 and a stress release area 222a. The structural support area 221 is a mesh structure, a membrane structure, or a composite structure formed by laminating a mesh structure and a membrane structure by interlacing warp and weft of yarns of the same or different materials. The material of the structural support area 221 is not particularly limited, as long as it can maintain the overall structure of the mesh 2 and support the graphic area 21 set in the mesh 2. For example, it can be selected from one or more combinations of various polymer materials such as polyester, polyvinyl chloride, polymethyl methacrylate, epoxy resin, etc.

[0035] The stress release area 222a has good extensibility, so as to provide additional extension space during the period when the scraper presses down the printing screen 100 during printing, thereby achieving the effect of stress release. In detail, the structural support area 221 has a first elastic coefficient, and the stress release area 222a has a second elastic coefficient, and the second elastic coefficient is smaller than the first elastic coefficient. Among them, the elastic coefficient (or elastic constant, tensile modulus) is used to indicate the degree to which an object resists deformation when subjected to stress, which is the ratio of the force applied to the object and its degree of deformation. The larger the elastic coefficient, the less likely the object is to deform when subjected to force. Conversely, the smaller the elastic coefficient, the easier it is for the object to deform when subjected to force.

[0036] Since the second elastic coefficient of the stress release area 222a is smaller than the first elastic coefficient of the structural support area 221, the mesh 2 of the printing screen 100 has a larger deformation when subjected to the stress of the scraper pressing down, compared with when the stress release area 222a is not provided. In other words, by providing the stress release area 222a in the peripheral area 22, the stress applied by the scraper to the printing screen 100 can be effectively released during printing, thereby making it difficult for the graphic area 21 to deform, avoiding line expansion during printing, and printing a printed circuit or printed graphic with precise graphic lines. In a preferred embodiment, the difference between the first elastic coefficient and the second elastic coefficient is, for example, 150 MPa or more, so that the mesh 2 can obtain a significant stress release effect during the printing process.

[0037] Furthermore, the second elastic coefficient of the stress release area 222a is preferably between 150MPa and 1100MPa. If the second elastic coefficient is too large, the stress release area 222a is not easily deformed and it is difficult to release the stress applied by the scraper to the printing screen 100 during printing. If the second elastic coefficient is too small, the deformation of the stress release area 222a is too large, so that the overall tension of the mesh 2 is insufficient and it cannot rebound quickly, resulting in the situation of sticking to the screen. The structure of the stress release area 222a is not particularly limited. For example, it can be a mesh structure formed by interlacing the warp and weft of yarns of the same material or different materials, or it can be a non-mesh structure such as a film layer, preferably a film layer. By using a film layer as the stress release area 222a, the manufacturing process is simpler than that of a mesh structure, and the manufacturing cost of the stress release area 222a can be reduced. The material of the stress release area 222a is not particularly limited. For example, various thermoplastic polymers such as polyethylene, hot melt adhesive, thermoplastic polyurethane, polyolefin and thermoplastic polyester elastomer or composite materials thereof can be used. The configuration of the stress release area 222a is also not particularly limited. In a preferred embodiment, the stress release area 222a can be configured along the direction of the scraper moving back and forth, so that the stress applied by the scraper to the printing screen 100 during printing can obtain the most direct release effect. In addition, the present disclosure does not limit the shape and size of the stress release area 222a. Figure 1 The strip shape of the middle stress release area 222 a is only an example. In practical applications, it can also be configured as a rectangle, circle, oval, etc. of different sizes according to requirements.

[0038] Figure 1 The embodiment of the present disclosure shown in the figure only has one stress release area 222a disposed in the peripheral area 22 for the convenience of description. It should be understood that the present disclosure is not intended to limit the number of stress release areas. For example, in one embodiment, multiple stress release areas may also be disposed, such as Figure 2 and Figure 3 shown. Figure 2 1 is a schematic diagram of another embodiment of the printing screen 100 of the present disclosure, and the description of each corresponding component is as described above. Figure 2 In the embodiment, a plurality of stress release areas 222 b are disposed on the peripheral area 22 of the mesh 2 , and the plurality of stress release areas 222 b are disposed on a single side of the peripheral area 22 . Figure 3 1 is a schematic diagram of another embodiment of the printing screen 100 of the present disclosure, and the description of each corresponding component is as described above. Figure 3 In the embodiment, two stress release areas 222c are disposed on the peripheral area 22 of the mesh 2. The two stress release areas 222c are disposed on opposite sides of the peripheral area 22 to provide a more uniform stress release space.

[0039] Cheng Figures 1 to 3In the embodiment, the stress release areas 222a, 222b, 222c are disposed in the peripheral area 22 and are not adjacent to the screen frame 1 or the graphic area 21. However, in another embodiment, they may be disposed adjacent to the screen frame 1 or the graphic area 21 as required, such as Figure 4 and Figure 5 shown. Figure 4 1 is a schematic diagram of another embodiment of the printing screen 100 of the present disclosure, and the description of each corresponding component is as described above. Figure 4 In the embodiment, a stress release area 222d is provided on the peripheral area 22 of the mesh 2, and the stress release area 222d is adjacent to the graphic area 21 but not adjacent to the mesh frame 1. Figure 5 1 is a schematic diagram of another embodiment of the printing screen 100 of the present disclosure, and the description of each corresponding component is as described above. Figure 5 In the embodiment, a stress release area 222e is provided on the peripheral area 22 of the mesh 2, and the stress release area 222e is adjacent to the mesh frame 1 but not adjacent to the graphic area 21.

[0040] Please refer to the data of the experiment conducted according to the embodiment of the present disclosure in Table 1 below to obtain a clearer understanding of the present disclosure. In this experiment, the mesh 2 of the printing screen 100 uses a 480.11 mesh, the structural support area 221 of the peripheral area 22 of the mesh 2 uses a composite structure formed by pressing polyester fiber and polyester film, and a stress release area 222a is set in the peripheral area 22 of the mesh 2, the graphic area 21 uses an electroformed plate with a thickness of 20μm, the width of the graphic opening is 13μm, and a fully open screen without a connecting bracket is used. Among them, the control group 1 is a printing screen without a stress release area 222a.

[0041]

[0042] (Table 1)

[0043] It can be seen from the above experimental data that, compared with control group 1, experimental group A and experimental group B can print an average widening closer to the width of the pattern opening through the setting of the stress release area 222a. Compared with the stress release area 222a with a second elastic coefficient of 600MPa (experimental group A), when the second elastic coefficient of the stress release area 222a is 300MPa (experimental group B), the printed pattern has an average widening closer to the width of the pattern opening. Obviously, the printing screen technology disclosed in the present invention can effectively reduce the situation of ink overflow caused by deformation of the mesh due to force, thereby improving the situation of printing line expansion.

[0044] The present invention discloses a stress release area with an elastic coefficient smaller than that of the structural support area in the peripheral area of ​​the mesh. When such a printing screen is used for printing, the stress applied to the screen by the scraper during printing can be effectively released, thereby avoiding deformation of the graphic openings in the graphic area of ​​the mesh caused by the stress applied to the screen by the scraper during printing, and avoiding the situation in the known technology where ink overflows from the openings set on the metal foil during printing, thereby improving the problems of line expansion and ink leakage and improving the printing quality.

[0045] Although the embodiments of the present disclosure have been disclosed above, they are not intended to limit the present disclosure. Those skilled in the art may make slight changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the scope of protection of the present disclosure shall be defined by the attached claims.

Claims

1. A printing screen with a stress release area, comprising: a frame; and A mesh is disposed in the mesh frame, and the mesh comprises: a graphics area; and A peripheral area is disposed around the graphic area, and the peripheral area includes: a structural support region, wherein the structural support region has a first elastic coefficient; and A stress release area, wherein the stress release area has a second elastic coefficient, and the second elastic coefficient is smaller than the first elastic coefficient. 2 . The printing screen with stress release area as claimed in claim 1 , wherein the difference between the first elastic coefficient and the second elastic coefficient is greater than 150 MPa. 3 . The printing screen with stress release area as claimed in claim 1 , wherein the second elastic coefficient is between 150 MPa and 1100 MPa. 4 . The printing screen with stress release area as claimed in claim 1 , wherein the material of the pattern area comprises metal or polymer material.

5. The printing screen with stress release area as claimed in claim 1, wherein the graphic area is in sheet or mesh shape. 6 . The printing screen with stress release area as claimed in claim 1 , wherein the structural support area is a mesh structure, a film structure or a composite structure of a mesh and a film. 7 . The printing screen with stress release area as claimed in claim 1 , wherein the stress release area is a mesh structure or a film layer. 8 . The printing screen with stress release area as claimed in claim 1 , wherein the material of the stress release area is a thermoplastic polymer.

9. The printing screen with stress relief area as claimed in claim 8, wherein the thermoplastic polymer is selected from the group consisting of polyethylene, hot melt adhesive, thermoplastic polyurethane, polyolefin and thermoplastic polyester elastomer.

10. The printing screen with stress release area as claimed in claim 1, wherein the stress release area is located on two opposite sides of the graphic area.

11. The printing screen with stress relief area as claimed in claim 1, wherein the stress relief area is arranged in the structural support area and is not adjacent to the graphic area and the screen frame. 12 . The printing screen with a stress release area as claimed in claim 1 , wherein the stress release area is disposed in the structural support area and is adjacent to the graphic area and / or the screen frame.

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