Screen printing plate for one-way yarns

Abstract

A one-way yarn printing screen comprises a screen frame and screen cloth. The screen cloth is arranged in the screen frame and consists of a plurality of yarns; the yarns are not interlaced with each other, and each of the yarns has substantially the same horizontal height at a position corresponding to each other.

Description

Technical Field

[0001] The present disclosure relates to a printing screen, and in particular to a printing screen for unidirectional yarns. Background Art

[0002] Screen printing is a technology that uses the pressure of a scraper to squeeze ink through a mesh to print on the printed object. In the known technology, the mesh is woven with crisscross yarns, such as Figure 1A The schematic diagram of the structure of the conventional printing screen 100 is shown. The printing screen 100 comprises a screen frame 110 and a mesh 120, wherein the mesh 120 is formed by interweaving a plurality of longitudinal yarns 1202 and a plurality of transverse yarns 1204, cutting them into the required size and then laminating them with a material net 122 such as polyester fiber. Please refer to Figure 1B , Figure 1B Show Figure 1A Schematic diagram of a cross section of the printing screen 100 along the section line AA'. Figure 1B It can be seen that the longitudinal yarns 1202 and the transverse yarns 1204 are displaced and deformed at the intersections due to the interweaving and pushing of each other, forming a continuous curved shape. For example, the horizontal height of the center plane of the mesh 120 is defined as LH1, and due to interweaving with the transverse yarns 1204, the longitudinal yarns 1202a and 1202c are pushed and displaced to a higher horizontal height LH2, while the longitudinal yarn 1202b is pushed and displaced to a lower horizontal height LH3. Due to the ups and downs of the longitudinal yarns 1202 and the transverse yarns 1204, the thickness of the printed pattern will also present ups and downs.

[0003] In addition, in order to print graphics with higher precision, part of the printed area of ​​the mesh is usually de-yarned. De-yarning means removing part of the yarn (either the longitudinal yarn or the transverse yarn) to increase the ink penetration of the printed area of ​​the mesh. Figure 2A The conventional printing screen 200 is shown. The printing screen 200 is, for example, a structure of the printing screen 100 that has been subjected to yarn removal processing, and has a yarn removal area RZ. The transverse yarns 1204 have been removed from the yarn removal area RZ, and only the longitudinal yarns 1202 (1202a, 1202b, and 1202c) remain. In order to take into account the tension strength of the mesh, the yarns in the printing area are generally made of metal. Therefore, even after the mesh is yarn removed, the deformation caused by the yarn weaving in the initial process will still exist, such as Figure 2B The basis shown Figure 2A A schematic cross-sectional view of the printing screen 200 along the section line BB′. Figure 2BIn the figure, even after the mesh 120 has been de-yarned, the longitudinal yarns 1202a and 1202c in the de-yarned area RZ still roughly maintain the higher level height LH2 to which they were pushed by the transverse yarns 1204 before de-yarning, and the longitudinal yarn 1202b also still roughly maintains the lower level height LH3 to which they were pushed by the transverse yarns 1204 before de-yarning.

[0004] In order to improve the above-mentioned yarn deformation problem, there are also known printing screens that make mesh cloth by skipping yarns or increasing the distance between adjacent yarns in the printing area of ​​the mesh cloth. Summary of the invention

[0005] As mentioned above, the interweaving method used in the prior art will cause the longitudinal and transverse yarns of the mesh to deform at the interlaced mesh nodes, causing each yarn to have asymmetrical ups and downs. Even after the subsequent yarn removal process, the deformation of the yarn cannot be restored, which will cause the thickness of the printed pattern to be uneven. In addition, the mesh formed by the interweaving will produce tension changes due to yarn removal, causing the yarn alignment to shift, causing the size of the printed pattern to change, and the printing fineness is not as expected. The production of mesh by skipping weaving or increasing the yarn spacing will also limit the scope of the printing area, and the weaving process must still be carried out to form the mesh for use. Its production process is almost the same as that of a general printing screen.

[0006] The present invention aims to provide a printing screen for unidirectional yarns to solve at least one of the above problems. The printing screen for unidirectional yarns comprises a screen frame and a mesh. The mesh is arranged in the screen frame and is composed of a plurality of yarns. The yarns are not interlaced with each other, and the horizontal heights of each of the yarns at corresponding positions are substantially the same.

[0007] In one embodiment, the mesh is not de-threaded.

[0008] In one embodiment, each of the yarns is straight without bends.

[0009] In one embodiment, the printing screen for unidirectional yarn further comprises a film layer, which is coated on the mesh and comprises pattern openings for the printing material to pass through.

[0010] In one embodiment, the printing screen for unidirectional yarns further comprises a reinforcement structure disposed on the mesh.

[0011] In one embodiment, the reinforcing structure and the yarns are arranged vertically or obliquely in an interlaced manner.

[0012] In one embodiment, the reinforcing structure is a polymer yarn.

[0013] Compared with the conventional printing screen, the printing screen disclosed in the present invention is free from the complicated process of weaving the mesh cloth in the past, and because it only has unidirectional yarns, the mesh cloth thickness is thinner, and the process and material costs are low. It can print finer graphics without yarn removal, and the tension of the mesh cloth can be maintained. The horizontal heights of the corresponding parts of the yarns in the printing screen disclosed in the present invention are the same, which makes it easy to control the thickness of the printed graphics and the printing quality is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1A A schematic diagram showing the structure of a known printing screen.

[0015] Figure 1B A schematic side cross-sectional view of a known printing screen is shown.

[0016] Figure 2A A schematic diagram showing the structure of a known printing screen.

[0017] Figure 2B A schematic side cross-sectional view of a known printing screen is shown.

[0018] Figure 3A A schematic diagram showing the architecture of a printing screen according to some embodiments of the present disclosure.

[0019] Figure 3B A schematic side cross-sectional view of a printing screen according to some embodiments of the present disclosure is shown.

[0020] Figure 4 A schematic diagram showing the architecture of a printing screen according to some embodiments of the present disclosure.

[0021] Figure 5 A schematic diagram showing the architecture of a printing screen according to some embodiments of the present disclosure.

[0022] Figure 6 A schematic diagram showing the architecture of a printing screen according to some embodiments of the present disclosure.

[0023] Fig. 7A A partially enlarged schematic diagram showing a printing screen according to some embodiments of the present disclosure.

[0024] Figure 7B A partially enlarged schematic diagram showing a printing screen according to some embodiments of the present disclosure.

[0025] Figure 8 A schematic diagram showing the architecture of a printing screen according to some embodiments of the present disclosure.

[0026] The reference numerals are as follows:

[0027] 100, 200, 300, 400, 500, 600, 600': Printing screen

[0028] 110, 310: Screen frame

[0029] 120, 320: Mesh

[0030] 1202, 1202a, 1202b, 1202c: longitudinal yarns

[0031] 1204: Transverse yarn

[0032] 122, 322: Material Network

[0033] 3202, 3202', 3202a, 3202b, 3202c: yarn

[0034] 324: Ink area

[0035] 330: Film layer

[0036] 332: Graphic opening

[0037] 340, 342: Reinforcement structure

[0038] A-A', B-B', C-C': hatching line

[0039] C1, C1', C2, C2', C3, C3': corresponding

[0040] LH1, LH2, LH3, LH4: Horizontal height

[0041] RZ: Yarn removal area

[0042] S1: First side

[0043] S2: Second side

[0044] S3: The third side

[0045] S4: The fourth side DETAILED DESCRIPTION

[0046] The following embodiments are described in detail with the accompanying drawings, but the specific embodiments described are only used to explain the present disclosure and are not used to limit the present disclosure. 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 present disclosure. The directional terms mentioned in the present disclosure, such as "up", "down", "left", "right", "horizontal", "longitudinal", "lateral", etc., 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 disclosure, not to limit the present disclosure. In addition, the drawings are only used for schematic illustration and are not drawn according to their actual size.

[0047] The terms used throughout the specification and claims have the ordinary meanings of each term used in this field, 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.

[0048] See also Figure 3A , Figure 3A The schematic diagram of the structure of the printing screen 300 of some embodiments of the present disclosure is shown. The printing screen 300 is composed of a screen frame 310 and a mesh 320, and the mesh 320 is, for example, a composite material mesh, which is formed by, for example, stretching a plurality of metal yarns 3202 and pressing them with a polyester fiber material mesh 322, and fixing them to the screen frame 310. The yarns 3202 are not interlaced with each other. It should be understood that the yarns 3202 and the material mesh 322 can be made of suitable materials according to actual needs, or in another embodiment, the mesh 320 can also be a single material mesh such as metal, which is not limited by the present disclosure. Please refer to Figure 3B , Figure 3B Show Figure 3A The side cross-sectional diagram of the printing screen 300 according to the section line CC' is shown. Compared with the conventional bidirectional yarn printing screen with yarn removal (such as the printing screen 200), the mesh 320 of the printing screen 300 has not undergone any yarn interlacing process. It only has unidirectional non-interlaced yarns 3202 during the manufacturing process and the finished product. Therefore, the yarns 3202 will not produce any bending deformation and are substantially straight. Figure 3B In FIG. 1 , it can be seen that the horizontal height of the corresponding positions of each yarn 3202 on the section line CC' is substantially LH4. The horizontal height of the yarn referred to here is, for example, the height of the center of each yarn 3202 from the horizontal plane when the printing screen 300 is placed on the horizontal plane, or it can also be, for example, the height of the lowest point (lower edge) or the highest point (upper edge) of each yarn 3202 from the horizontal plane. In addition, it should be understood that Figure 3B This is only for illustration. The actual product may have very small differences in the horizontal heights of the yarns 3202 at the corresponding positions due to the selection of materials or process equipment. The range of this difference is, for example, smaller than the diameter of the yarns 3202. Since the mesh 320 has only unidirectional non-interlaced yarns 3202, it does not need to be de-threaded to print fine patterns that can only be printed after de-threading of the known woven printing screen.

[0049] Based on the above embodiment, the screen frame 310 is, for example, a rectangle. Figure 3AAs shown in FIG. 1 , it can be divided into a first side S1, a second side S2, a third side S3 and a fourth side S4 that are adjacent in sequence, and the yarn 3202 can be, for example, parallel to the second side S2 or the fourth side S4 of the mesh frame 310. In another embodiment, the mesh frame 310 can also be any polygon, and the yarn 3202 is parallel to one side of the mesh frame 310. In another embodiment, the yarn of the mesh frame can also be arranged obliquely and not parallel to any side of the mesh frame, such as Figure 4 The schematic diagram of the structure of the printing screen 400 of some embodiments of the present disclosure is shown. The printing screen 400 is the same as the printing screen 300, and is composed of a screen frame 310 and a mesh 320. The difference between the printing screen 400 and the printing screen 300 is that the mesh 320 of the printing screen 400 is formed by pressing the obliquely arranged yarns 3202' and the material net 322. In short, in this embodiment, each yarn 3202' is not parallel to any of the first side S1, the second side S2, the third side S3 and the fourth side S4 of the screen frame 310.

[0050] See also Figure 5 , Figure 5 The schematic diagram of the structure of the printing screen 500 of some embodiments of the present disclosure is shown. The printing screen 500 is the same as the printing screen 300, and is composed of a screen frame 310 and a mesh 320. The mesh 320 is formed by stretching a plurality of yarns 3202 and pressing them with a material net 322, and then fixing them to the screen frame 310, and the yarns 3202 are not interlaced with each other. The mesh 320 of the printing screen 500 is further coated with a film layer 330, and the film layer 330 has a pattern opening 332. The film layer 330 is used to shield the printing material (not shown in the figure) from passing through the mesh 320, and the pattern opening 332 allows the printing material to pass through, so that the printing material can be further attached to the printed object (not shown in the figure). In addition, the provision of the film layer 330 can also simultaneously enhance the structural strength of the mesh 320, so that the yarns 3202 of the mesh 320 are not easily offset. Specifically, the film layer 330 is, for example, an emulsion or a polymer material, which is coated on the mesh 320 and then cured, and then laser engraving or chemical etching is performed to form the pattern openings 332. It should be understood that the shape, size and number of the pattern openings 332 are adjusted based on the pattern to be printed, and the present disclosure is not limited thereto.

[0051] See also Figure 6 , Figure 6A schematic diagram of the structure of the printing screen 600 of some embodiments of the present disclosure is shown. The printing screen 600 is the same as the printing screen 300, and is composed of a screen frame 310 and a mesh 320. The mesh 320 is formed by stretching a plurality of yarns 3202 and pressing them with a material net 322, and then fixing them to the screen frame 310, and the yarns 3202 are not interlaced with each other. The mesh 320 has an ink lowering area 324, and the ink lowering area 324 is a region for printing printed graphics. In order to strengthen the structural strength of the mesh 320, the mesh 320 of the printing screen 600 may be further provided with a reinforcement structure 340. The reinforcement structure 340 is, for example, made of a polymer material, which can fix at least two or more yarns 3202 to prevent the yarns 3202 from being offset due to the scraping force of the scraper during printing. In addition, the reinforcement structure 340 is arranged in an area outside the ink lowering area 322 to avoid affecting the ink permeability during printing. It should be understood that Figure 6 Although two rectangular reinforcement structures 340 are shown, they are only for illustration. The shape, number and position of the reinforcement structures 340 can be adjusted according to actual needs, and the present disclosure does not limit them.

[0052] In one embodiment, the reinforcing structure 340 may be disposed perpendicular to the yarn, such as Fig. 7A A partially enlarged schematic diagram of a mesh 320 provided with a reinforcement structure 340 according to some embodiments of the present disclosure is shown. Fig. 7A In the embodiment, the reinforcing structures 340 are arranged vertically and staggered with the yarns 3202a, 3202b, and 3202c. In actual applications, the reinforcing structures 340 may cause slight deformation of the yarns 3202a, 3202b, and 3202c due to the thinner diameter or softer material of the yarns used. Fig. 7A The corresponding positions C1, C2, and C3 of the overlapping yarns 3202a, 3202b, and 3202c of the reinforcing structure 340 are shown. However, since the same reinforcing structure 340 is integrally disposed on one side of the scraper surface or the printing surface of the mesh 320, the deformation amount and deformation direction of the yarns 3202a, 3202b, and 3202c caused by it are the same. In other words, the horizontal heights of the corresponding positions C1, C2, and C3 of the yarns 3202a, 3202b, and 3202c overlapping the reinforcing structure 340 are the same.

[0053] In another embodiment, the reinforcing structure 340 may also be arranged to be obliquely staggered with the yarns, such as Figure 7B A partially enlarged schematic diagram of a mesh 320 provided with a reinforcement structure 340 according to some embodiments of the present disclosure is shown. Figure 7BIn the figure, the reinforcing structure 340 is staggered obliquely with the yarns 3202a, 3202b, and 3202c. In other words, the reinforcing structure 340 is staggered with the yarns 3202a, 3202b, and 3202c at non-vertical angles. As mentioned above, in actual applications, the setting of the reinforcing structure 340 may cause some deformation of the yarns 3202a, 3202b, and 3202c. However, because the same reinforcing structure 340 is disposed as a whole on one side of the scraper surface or the printing surface of the mesh 320, the deformation amount and deformation direction of the yarns 3202a, 3202b, and 3202c caused by it are the same, such as Figure 7B In other words, the corresponding positions C1', C2', C3' of the yarns 3202a, 3202b, 3202c overlapping the reinforcing structure 340 are the same in height.

[0054] As can be seen from the above, even if the reinforcement structure 340 may cause some deformation of the yarns 3202a, 3202b, 3202c, the horizontal heights of the corresponding deformation locations C1, C2, C3 (or C1', C2', C3') are still the same. Therefore, when the printing screen 600 is affected by the pressure of the scraper during the printing process, the forces on each yarn are consistent, and the mesh tension and printing quality can still be maintained stable. In addition, as mentioned above, the reinforcement structure 340 is set outside the ink-lowering area, and the yarn part in the ink-lowering area is still maintained straight, that is, the mesh in the ink-lowering area is still flat and has no undulations, so the fineness of the printed pattern will not be affected by the reinforcement structure 340.

[0055] Please read next Figure 8 , Figure 8 The schematic diagram of the structure of the printing screen 600' of some embodiments of the present disclosure is shown. The general structure of the printing screen 600' is the same as that of the printing screen 600, and it is also composed of a screen frame 310 and a mesh 320. The mesh 320 is formed by stretching a plurality of yarns 3202 and pressing them with a material net 322, and then fixing them to the screen frame 310, and the yarns 3202 are not interlaced with each other. For the description of the same structure, please refer to the description in the previous paragraph, which will not be repeated here. Unlike the printing screen 600, the reinforcement structure 342 of the printing screen 600' is a yarn shape, which is, for example, a polymer yarn with higher strength. The same reinforcement structure 340 is integrally arranged on one side of the scraper surface or the printing surface of the mesh 320, and is located outside the ink lowering area 322. The reinforcement structure 342 can also be vertically or obliquely interlaced with the yarns 3202, and its number, position and setting angle can also be adjusted according to actual needs.

[0056] 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 for unidirectional yarns, comprising: a frame; and A mesh cloth is arranged in the mesh frame, wherein the mesh cloth is composed of a plurality of yarns, the plurality of yarns are not interlaced with each other, and the horizontal heights of each of the plurality of yarns at corresponding positions are the same.

2. The unidirectional yarn printing screen as claimed in claim 1, wherein the mesh is not treated with yarn.

3. The unidirectional yarn printing screen as claimed in claim 1, wherein each of the plurality of yarns is straight without bending.

4. The printing screen for unidirectional yarn according to claim 1, further comprising: A film layer is coated on the mesh, and the film layer comprises a pattern opening for the printing material to pass through.

5. The printing screen for unidirectional yarn according to claim 1, further comprising: A reinforcement structure is arranged on the mesh.

6. The printing screen for unidirectional yarns as claimed in claim 5, wherein the reinforcement structure is arranged vertically or obliquely staggered with the plurality of yarns.

7. The printing screen for unidirectional yarns as claimed in claim 5, wherein the reinforcement structure is a polymer yarn.

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