A high-mesh metal printing screen for online pulse unblocking, its preparation method and application

Abstract

This invention relates to the field of screen printing materials technology, specifically to a high-mesh metal printing screen capable of online pulse declogging, its preparation method, and its application. The high-mesh metal printing screen, capable of online pulse declogging, comprises, from the inside out, a metal mesh body, a surface functional layer attached to the surface of the metal mesh body, an edge guiding zone, an insulating frame layer, a heat-resistant adhesive layer, and a metal mesh frame. While maintaining high aperture accuracy and low slurry residue adhesion tendency, the high-mesh metal printing screen possesses online gentle declogging capability, which can improve service life, slurry penetration stability, and printing consistency under continuous production conditions. This effectively solves the problems of easy clogging, difficulty in online recovery, aperture deformation after long-term printing, low cleaning efficiency, and rapid lifespan decay of existing high-mesh metal printing screens during continuous printing, and provides a new technical approach for the design and preparation of high-mesh printing screens.

Description

Technical Field

[0001] This invention relates to the field of screen printing materials technology, specifically to a high-mesh metal printing screen capable of online pulse unblocking, its preparation method, and its application. Background Technology

[0002] In recent years, with the continuous narrowing of photovoltaic cell main grid lines and fine grid lines, and the increasing demands for precision and consistency in the printing of micro-wires, transparent conductive patterns, flexible circuits, and fine functional layer patterns in the electronic display field, metal printing meshes, represented by stainless steel mesh, tungsten wire mesh, and composite metal fine wire mesh, have gradually replaced traditional polyester meshes. High-mesh-count, fine-wire-diameter precision metal printing meshes, in particular, have become increasingly valuable in high-end precision printing due to their higher rigidity, better wear and heat resistance, and superior aperture shape retention capabilities. Therefore, they have gradually become an important basic component in photovoltaic electrode printing and fine pattern printing for electronic displays. However, as metal printing meshes continue to evolve towards higher mesh counts and finer wire diameters, some problems in actual continuous printing processes are becoming increasingly prominent.

[0003] However, as metal printing screens continue to develop towards higher mesh counts and finer wire diameters, their problems in continuous printing processes are becoming increasingly apparent. On the one hand, with smaller mesh sizes and finer wire diameters, metal particles, glass powder, resin binders, and organic solvents in the printing paste are more likely to adhere and deposit on the surface of the wires and in the warp and weft intersection areas. Especially under conditions of high-solids printing paste and high-frequency continuous printing, local micropores are prone to forming semi-dry residues and causing blockages, which in turn leads to unstable paste penetration, line width shrinkage, local line breaks, and even pattern loss, significantly affecting printing quality and product yield.

[0004] Furthermore, current methods for addressing screen clogging largely rely on solvent cleaning, manual brushing, soaking, or ultrasonic cleaning after machine shutdown and screen removal. This not only disrupts production and increases maintenance costs but also easily damages the wire surface, destroying the original protective or functional layers and shortening the screen's lifespan. Existing solutions that improve abrasion resistance or reduce adhesion through surface coatings also primarily focus on initial anti-adhesion effects, neglecting the online recovery capability after clogging occurs, thus failing to fundamentally solve the screen clogging problem under long-term continuous printing conditions.

[0005] Therefore, there is an urgent need to provide a new type of high-mesh precision metal printing screen that not only has high aperture accuracy, dimensional stability and low residual adhesion tendency, but also can achieve online gentle declogging during continuous printing, thereby improving service life and printing consistency under continuous production conditions. Summary of the Invention

[0006] To address the problems of clogging, difficulty in online recovery, long-term hole deformation after printing, low cleaning efficiency, and rapid lifespan decay of existing high-mesh metal printing screens during continuous printing, this invention provides a high-mesh metal printing screen with online pulse declogging capability, its preparation method, and its application. This online pulse declogging high-mesh metal printing screen maintains high hole shape accuracy and low residual adhesion tendency while possessing online gentle declogging capability, thereby improving its service life, ink penetration stability, and printing consistency under continuous production conditions. It effectively solves the problems of existing technologies and provides new materials and ideas for the preparation of printing screens.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solution: The first aspect of the present invention provides a high-mesh metal printing screen for online pulse deblocking, wherein the high-mesh metal printing screen comprises, from the inside out, a metal mesh body, a surface functional layer attached to the surface of the metal mesh body, an edge guiding area, an insulating frame layer, a heat-resistant adhesive layer, and a metal mesh frame; The edge guiding area is located at the edge of the metal mesh and is electrically connected to an external low-voltage pulse power supply; the insulating frame layer is located outside the edge guiding area at the junction with the metal mesh frame. The surface functional layer includes an adhesion-enhancing inner layer and a low surface energy wear-resistant outer layer. The adhesion-enhancing inner layer is any one of a Cr layer, a Ti layer, or a Si layer; the low surface energy wear-resistant outer layer is a fluorinated silane layer.

[0008] This invention first constructs a surface functional layer on the surface of the metal mesh. The adhesion-enhancing inner layer is mainly used to improve the bonding strength between the functional layer and the metal substrate, so that the outer layer can still be stably attached to the mesh surface under long-term printing friction, slurry washing and repeated pulse heat action, and is not prone to local peeling, flaking or failure. The low surface energy wear-resistant outer layer is mainly used to reduce the interfacial force between the slurry and the mesh surface, reduce the actual adhesion work of the slurry on the mesh surface, and reduce the mechanical interlocking of the slurry in the micro-uneven parts. At the micro-interfacial level, it weakens the bonding strength between the slurry residue and the mesh, making it less likely for the slurry to form a stable adhesion point on the mesh surface. The surface functional layer can reduce the residue generation rate and adhesion strength from the source, thus significantly reducing the probability of mesh clogging.

[0009] To achieve uninterrupted unblocking, this invention incorporates a flow-guiding zone at the edge of the metal mesh. When a low-voltage pulse current is applied, the metal mesh itself heats up. This heat is not continuous but intermittent, causing residual slurry adhering to the mesh surface, especially those that have dried and hardened, to soften and loosen, making it easier to detach from the mesh. Combined with air blowing, spray cleaning, or continued scraping, these residues are more readily removed. Furthermore, the edge flow-guiding zone ensures that the current enters the working area as evenly as possible, preventing current concentration at the edges and causing localized overheating. This results in a more stable unblocking effect across the entire mesh surface, reduces damage to the metal mesh and surface functional layer, and prevents residue from being baked to a crisp due to excessive heat. The more even heating of the metal mesh and the gentler unblocking process make it more suitable for continuous long-term use, thereby improving the cleaning rate and extending the lifespan of the metal mesh. With the insulating frame layer installed, current is less likely to escape to the frame itself, allowing it to concentrate more effectively in the printed area, resulting in a more stable unblocking effect. Simultaneously, the frame layer reduces heat loss from the frame, preventing insufficient heating at the edges and ensuring overall unblocking. This not only improves the efficiency of electricity and heat utilization but also reduces aging issues caused by repeated heating of the frame, adhesive layer, and connecting parts.

[0010] In summary, the high-mesh-count metal printing screen with online pulse declogging provided by this invention utilizes the synergistic effect of multiple components to achieve online recovery of the high-mesh-count metal printing screen during continuous printing without relying on frequent screen disassembly and cleaning. This effectively solves the problems of easy clogging, difficult recovery, frequent downtime maintenance, and reduced lifespan of high-mesh-count metal printing screens during continuous printing in the prior art.

[0011] Preferably, the metal mesh is at least one of tungsten wire or stainless steel wire.

[0012] Preferably, the metal mesh has a mesh count of 430-1500, the warp and weft wire diameters are 3-20μm respectively, and the opening rate of the effective printing area is 60%-70%.

[0013] The preferred metal mesh of this invention ensures that the metal printing mesh can achieve fine printing capabilities while also taking into account the ink permeability, mesh strength, and stability in use.

[0014] Preferably, the edge guiding area includes conductive adhesive, conductive strip, and external electrical interface; wherein the conductive strip is any one of copper foil strip, nickel-plated copper strip, or stainless steel conductive strip.

[0015] The edge current-conducting zone can introduce current into the metal mesh, causing the metal mesh to generate uniform heat under the action of low voltage pulses, thereby softening or loosening the residual slurry adhering to the surface of the mesh wire.

[0016] Preferably, the insulating frame layer is a polyimide insulating layer.

[0017] The polyimide insulation layer has good insulation and heat resistance properties, which can reduce the diffusion of current to the frame and reduce the adverse effects of repeated heating of the edge area on the fixed structure without significantly affecting the assembly and flatness of the tensioning mesh.

[0018] Preferably, the metal mesh frame is an aluminum alloy frame or a stainless steel frame.

[0019] Preferably, the low surface energy wear-resistant outer layer is a 1H,1H,2H,2H-perfluorooctyltriethoxysilane layer or a 1H,1H,2H,2H-perfluorodecyltriethoxysilane layer.

[0020] Preferably, the thickness of the adhesion-enhancing inner layer is 50-100 nm; and the thickness of the low surface energy wear-resistant outer layer is 100-200 nm.

[0021] This invention reduces the tendency of slurry to adhere to and deposit on the surface of the wires and in the warp and weft intersection areas by depositing a surface functional layer on the surface of a high mesh count metal mesh, thereby mitigating the risk of mesh blockage from the source.

[0022] Preferably, the thickness of the conductive adhesive is 5-10 μm.

[0023] More preferably, the conductive adhesive is MG Chemicals 8330D.

[0024] Preferably, the thickness of the conductive strip is 20-30 μm.

[0025] More preferably, the conductive strip is a copper foil strip.

[0026] Preferably, the thickness of the insulating frame layer is 50-100 μm.

[0027] Preferably, the thickness of the heat-resistant adhesive layer is 50-150 μm.

[0028] More preferably, the heat-resistant adhesive is of type LOCTITE EA 9492.

[0029] A second aspect of the present invention provides a method for preparing the aforementioned high-mesh-count metal printing screen capable of online pulse unblocking, comprising the following steps: S1. Clean and dry the metal mesh, and then use plasma deposition to sequentially deposit an adhering reinforcing inner layer and a low surface energy wear-resistant outer layer on the surface of the dried metal mesh to obtain a first-processed mesh. S2. Apply conductive adhesive to the edge of the primary processed mesh, attach metal foil tape, leave an external electrical interface, and cure to obtain the secondary processed mesh. S3. Apply heat-resistant adhesive to the outside of the secondary processed mesh, bond and fix the polyimide film to the heat-resistant adhesive, and heat to cure to obtain the tertiary processed mesh. S4. Fix the three-stage processed mesh to the metal mesh frame, and energize the external power interface to obtain a high-mesh metal printing mesh that can be deblocked online by pulse.

[0030] Preferably, in S1, the process parameters for plasma deposition of the enhanced inner layer are: argon flow rate 40-80 sccm, methylsilane flow rate 5-15 sccm, chamber pressure 10-50 Pa, substrate temperature 60-120℃, RF frequency 13-15 MHz, power 80-180 W, and deposition time 20-90 s.

[0031] Preferably, in S1, the process parameters for plasma deposition of the low surface energy wear-resistant outer layer are: argon flow rate 50-80 sccm, Si4F8 flow rate 13-18 sccm, cavity pressure 80-150 Pa, substrate temperature 80-120℃, RF power 20-40 W, and deposition time 20-60 s.

[0032] Preferably, in S2, the metal foil strip is a copper foil strip.

[0033] Preferably, in S2, the curing temperature is 100-150℃ and the curing time is 30-60 min; Preferably, in S3, the heating and curing temperature is 200-250℃, and the heating and curing time is 30-50 minutes.

[0034] Preferably, in S4, the three-stage treated mesh is fixed by bonding, using polyurethane frame adhesive to bond the mesh body to the metal frame.

[0035] More preferably, in S4, the polyurethane frame adhesive is of the type SAATI Ultrafix SB12 Plus.

[0036] The third aspect of this invention provides the application of the high-mesh metal printing screen with online pulse deblocking capability in the preparation of printing screens. Detailed Implementation

[0037] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] The conductive adhesive used in the following examples and comparative examples is MG Chemicals 8330D, the heat-resistant adhesive used in the following examples and comparative examples is LOCTITE EA 9492, and the polyurethane frame adhesive used in the following examples and comparative examples is SAATI Ultrafix SB12 Plus. All of these are commercially available products.

[0039] Example 1 This embodiment provides a high-mesh metal printing screen for online pulse unblocking. The high-mesh metal printing screen, from the inside out, comprises a tungsten wire mesh body, a surface functional layer attached to the surface of the tungsten wire mesh body, an edge guiding area, a polyimide insulating layer, a heat-resistant adhesive layer, and an aluminum alloy frame. The tungsten wire mesh body has a mesh count of 700, with warp and weft wire diameters of 7 μm each, and an open area ratio of 65% for the effective printing area. The edge guiding area is located at the edge of the tungsten wire mesh and is electrically connected to an external low-voltage pulse power supply; the insulating frame layer is located on the outside of the edge guiding layer at the junction with the aluminum alloy frame. The surface functional layer comprises a 50 nm thick Si inner layer and a 150 nm thick 1H,1H,2H,2H-perfluorooctyltriethoxysilane layer.

[0040] The method for preparing the high-mesh metal printing screen capable of online pulse unblocking includes the following steps: S1. The tungsten wire mesh is cleaned and dried. A Si inner layer and a 1H,1H,2H,2H-perfluorooctyltriethoxysilane layer are sequentially deposited on the surface of the dried tungsten wire mesh using plasma deposition to obtain a primary processed mesh. The process parameters for plasma deposition of the Si inner layer are: argon flow rate 60 sccm, methylsilane flow rate 10 sccm, chamber pressure 30 Pa, substrate temperature 100℃, RF frequency 13 MHz, power 150 W, and deposition time 60 s. The process parameters for plasma deposition of the 1H,1H,2H,2H-perfluorooctyltriethoxysilane layer are: argon flow rate 60 sccm, Si4F8 flow rate 15 sccm, chamber pressure 120 Pa, substrate temperature 100℃, RF power 30 W, and deposition time 50 s. S2. Coat the edge of the primary processed mesh with an 8μm thick conductive adhesive, attach a 25μm thick metal copper foil strip, leave an external electrical interface, and cure at 120℃ for 50 minutes to obtain a secondary processed mesh. S3. Coat the outer side of the secondary-treated mesh with a 100μm thick heat-resistant adhesive, bond and fix the 65μm polyimide film to the heat-resistant adhesive, and heat and cure at 220℃ for 40min to obtain the tertiary-treated mesh. S4. The three-stage processed mesh is bonded and fixed to the metal mesh frame with polyurethane frame adhesive, and the external power interface is powered on to obtain a high-mesh metal printed mesh that can be deblocked online by pulse.

[0041] Example 2 This embodiment provides a high-mesh metal printing screen for online pulse unblocking. The high-mesh metal printing screen, from the inside out, comprises a tungsten wire mesh body, a surface functional layer attached to the surface of the tungsten wire mesh body, an edge guiding area, a polyimide insulating layer, a heat-resistant adhesive layer, and an aluminum alloy frame. The tungsten wire mesh body has a mesh count of 680, with warp and weft wire diameters of 8 μm each, and an open area ratio of 60% for the effective printing area. The edge guiding area is located at the edge of the tungsten wire mesh and is electrically connected to an external low-voltage pulse power supply; the insulating frame layer is located on the outside of the edge guiding layer at the junction with the aluminum alloy frame. The surface functional layer includes a 60 nm thick Si inner layer and a 180 nm thick 1H,1H,2H,2H-perfluorodecyltriethoxysilane layer.

[0042] The method for preparing the high-mesh metal printing screen capable of online pulse unblocking includes the following steps: S1. The tungsten wire mesh is cleaned and dried. A Si inner layer and a 1H,1H,2H,2H-perfluorodecyltriethoxysilane layer are sequentially deposited on the surface of the dried tungsten wire mesh using plasma deposition to obtain a primary processed mesh. The process parameters for plasma deposition of the Si inner layer are: argon flow rate 60 sccm, methylsilane flow rate 10 sccm, chamber pressure 30 Pa, substrate temperature 100 °C, RF frequency 13 MHz, power 150 W, and deposition time 60 s. The process parameters for plasma deposition of the 1H,1H,2H,2H-perfluorodecyltriethoxysilane layer are: argon flow rate 60 sccm, Si4F8 flow rate 15 sccm, chamber pressure 120 Pa, substrate temperature 100 °C, RF power 30 W, and deposition time 50 s. S2. Coat the edge of the primary processed mesh with an 8μm thick conductive adhesive, attach a 20μm thick metal copper foil strip, leave an external electrical interface, and cure at 120℃ for 50 minutes to obtain a secondary processed mesh. S3. Coat the outer side of the secondary-treated mesh with a 100μm thick heat-resistant adhesive, bond and fix the 80μm thick polyimide film to the heat-resistant adhesive, and heat and cure at 230℃ for 35 minutes to obtain the tertiary-treated mesh. S4. The three-stage processed mesh is bonded and fixed to the metal mesh frame with polyurethane frame adhesive, and the external power interface is powered on to obtain a high-mesh metal printed mesh that can be deblocked online by pulse.

[0043] Example 3 This embodiment provides a high-mesh metal printing screen for online pulse unblocking. The high-mesh metal printing screen, from the inside out, comprises a tungsten wire mesh body, a surface functional layer attached to the surface of the tungsten wire mesh body, an edge guiding area, a polyimide insulating layer, a heat-resistant adhesive layer, and an aluminum alloy frame. The tungsten wire mesh body has a mesh count of 700, with warp and weft wire diameters of 8 μm each, and an open area ratio of 70% for the effective printing area. The edge guiding area is located at the edge of the stainless steel mesh and is electrically connected to an external low-voltage pulse power supply; the insulating frame layer is located on the outside of the edge guiding layer at the junction with the aluminum alloy frame. The surface functional layer includes a 50 nm thick Ti inner layer and a 150 nm thick 1H,1H,2H,2H-perfluorodecyltriethoxysilane layer.

[0044] The method for preparing the high-mesh metal printing screen capable of online pulse unblocking includes the following steps: S1. The tungsten wire mesh is cleaned and dried. A Ti inner layer and a 1H,1H,2H,2H-perfluorodecyltriethoxysilane layer are sequentially deposited on the surface of the dried tungsten wire mesh using plasma deposition to obtain a primary processed mesh. The process parameters for the plasma deposition of the Ti inner layer are: argon flow rate 60 sccm, methylsilane flow rate 10 sccm, chamber pressure 30 Pa, substrate temperature 100℃, RF frequency 13MHz, power 150W, and deposition time 60s. The process parameters for the plasma deposition of the 1H,1H,2H,2H-perfluorodecyltriethoxysilane layer are: argon flow rate 60 sccm, Si4F8 flow rate 15 sccm, chamber pressure 120 Pa, substrate temperature 100℃, RF power 30W, and deposition time 50s. S2. Coat the edge of the primary processed mesh with an 8μm thick conductive adhesive, attach a 25μm thick metal copper foil strip, leave an external electrical interface, and cure at 120℃ for 50 minutes to obtain a secondary processed mesh. S3. Coat the outer side of the secondary-treated mesh with an 80μm thick heat-resistant adhesive, bond and fix the 60μm polyimide film to the heat-resistant adhesive, and heat and cure at 220℃ for 40min to obtain the tertiary-treated mesh. S4. The three-stage processed mesh is bonded and fixed to the metal mesh frame with polyurethane frame adhesive, and the external power interface is powered on to obtain a high-mesh metal printed mesh that can be deblocked online by pulse.

[0045] Comparative Example 1 This comparative example provides a high-mesh metal printing screen capable of online pulse deblocking. The difference from Example 1 is that the surface functional layer is a 240nm thick silicon nitride layer, while other components and processes remain unchanged. Specifically, it includes the following: The high-mesh metal printing screen comprises, from the inside out, a tungsten wire mesh, a silicon nitride layer attached to the surface of the tungsten wire mesh, an edge guiding area, a polyimide insulating layer, a heat-resistant adhesive layer, and an aluminum alloy frame; wherein, the tungsten wire mesh has a mesh count of 700, the warp and weft wire diameters are 7μm, and the open area of ​​the effective printing area is 65%; The edge guiding area is located at the edge of the tungsten wire mesh and is electrically connected to an external low-voltage pulse power supply; the insulating frame layer is located on the outside of the edge guiding layer at the junction with the aluminum alloy frame. The method for preparing the high-mesh metal printing screen capable of online pulse unblocking includes the following steps: S1. The tungsten wire mesh is cleaned and dried. A silicon nitride layer is deposited on the surface of the dried tungsten wire mesh using plasma deposition to obtain a primary processed mesh. The process parameters for plasma deposition of the silicon nitride layer are: argon flow rate 80 sccm, methylsilane flow rate 20 sccm, chamber pressure 45 Pa, substrate temperature 100℃, RF frequency 15 MHz, power 150 W, and deposition time 150 s. S2. Coat the edge of the primary processed mesh with an 8μm thick conductive adhesive, attach a 25μm thick metal copper foil strip, leave an external electrical interface, and cure at 120℃ for 50 minutes to obtain a secondary processed mesh. S3. Coat the outer side of the secondary-treated mesh with a 100μm thick heat-resistant adhesive, bond and fix the 65μm polyimide film to the heat-resistant adhesive, and heat and cure at 220℃ for 40min to obtain the tertiary-treated mesh. S4. The three-stage processed mesh is bonded and fixed to the metal mesh frame with polyurethane frame adhesive, and the external power interface is powered on to obtain a high-mesh metal printed mesh that can be deblocked online by pulse.

[0046] To further demonstrate the technical effects of the present invention, the high mesh count metal printing screens obtained in Examples 1-3 and Comparative Example 1 were tested as follows: (1) The adhesion of the functional layer on the sample surface was tested according to GB / T 9286-2021 "Cross-cut test for paints and varnishes"; (2) Select metal printing mesh samples of the same specifications and use the same batch of silver paste for continuous printing on the same screen printing equipment. Keep the squeegee pressure, printing speed and squeegee angle consistent. Print continuously for 500 times. After printing, take pictures of the mesh surface and count the percentage of residual paste coverage area. Record it as the mesh surface residual rate. Then, apply a low voltage pulse treatment of 8V, 0.5s and 3 times to the sample, and then blow air at 0.2MPa for 10s. After that, measure the mesh surface residual rate again and calculate the paste recovery rate. The paste recovery rate is calculated by the following formula: Paste recovery rate (%) = Paste amount after unblocking / Initial paste amount × 100%; (3) Continuous printing stability test: After 500 consecutive printing cycles, 30 printing lines were randomly selected, and the line width was measured using a microscope. The average value and standard deviation were calculated, and the line width fluctuation rate was calculated using the following formula: Linewidth volatility (%) = Standard deviation / Average linewidth × 100% The test results are shown in Table 1.

[0047] Table 1 Performance Test Results

[0048] As shown in Table 1, the adhesion test results for Examples 1-3 were all grade 1, while Comparative Example 1 was grade 2, indicating that the surface layer formed by the present invention bonds more stably to the substrate and is less prone to peeling off. After 500 consecutive printing cycles, the screen residue rates for Examples 1-3 were 14.2%, 14.6%, and 15.1%, respectively, significantly lower than the 22.9% of Comparative Example 1. This demonstrates that the high-mesh metal printing screen provided by the present invention can effectively reduce the residue and accumulation of paste on the screen surface, resulting in a lower tendency to clog the screen.

[0049] Regarding the residual rate of the mesh after unblocking, Examples 1-3 decreased to 3.1%, 3.6%, and 3.9%, respectively, while Comparative Example 1 still had 7.6%, indicating that the solution of the present invention can more fully remove residues after unblocking and has a better online recovery effect. Regarding the pulp recovery rate, Examples 1-3 reached 96.7%, 95.8%, and 95.2%, respectively, significantly higher than the 82.3% of Comparative Example 1, indicating that the mesh permeability is more fully restored after unblocking. Regarding the line width fluctuation rate, Examples 1-3 were 3.2%, 3.4%, and 3.5%, respectively, all significantly lower than the 5.9% of Comparative Example 1, indicating that the solution of the present invention can better maintain printing stability and pattern consistency during continuous printing.

[0050] In summary, the high-mesh metal printing screen provided by this invention can not only reduce residue and improve the unclogging effect, but also enhance the stability of ink penetration and printing consistency, which helps to extend the service life of the printing screen.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-mesh-count metal printing screen capable of online pulse unblocking, characterized in that: The high-mesh metal printing screen comprises, from the inside out, a metal mesh body, a surface functional layer attached to the surface of the metal mesh body, an edge guiding area, an insulating frame layer, a heat-resistant adhesive layer, and a metal mesh frame; The edge guiding area is located at the edge of the metal mesh and is electrically connected to an external low-voltage pulse power supply; the insulating frame layer is located outside the edge guiding area at the junction with the metal mesh frame. The surface functional layer includes an adhesion-enhancing inner layer and a low surface energy wear-resistant outer layer. The adhesion-enhancing inner layer is any one of a Cr layer, a Ti layer, or a Si layer; the low surface energy wear-resistant outer layer is a fluorinated silane layer.

2. The high-mesh metal printing screen capable of online pulse unblocking as described in claim 1, characterized in that: The metal mesh is at least one of tungsten wire or stainless steel wire; The metal mesh has a mesh count of 430-1500, the warp and weft wire diameters are 3-20μm respectively, and the open area of ​​the effective printing area is 60%-70%. The edge guiding area includes conductive adhesive, conductive strip, and external electrical interface; wherein, the conductive strip is any one of copper foil strip, nickel-plated copper strip, or stainless steel conductive strip; The insulating frame layer is a polyimide insulating layer; The metal mesh frame is an aluminum alloy frame or a stainless steel frame.

3. The high-mesh metal printing screen capable of online pulse unblocking as described in claim 1, characterized in that: The thickness of the adhesion-enhancing inner layer is 50-100 nm; the thickness of the low surface energy wear-resistant outer layer is 100-200 nm. The thickness of the conductive adhesive is 5-10 μm; The thickness of the conductive strip is 20-30 μm; The thickness of the insulating frame layer is 50-100μm; The thickness of the heat-resistant adhesive layer is 50-150 μm.

4. A method for preparing a high-mesh metal printing screen capable of online pulse deblocking as described in any one of claims 1-3, characterized in that: Includes the following steps: S1. Clean and dry the metal mesh, and then use plasma deposition to sequentially deposit an adhering reinforcing inner layer and a low surface energy wear-resistant outer layer on the surface of the dried metal mesh to obtain a first-processed mesh. S2. Apply conductive adhesive to the edge of the primary processed mesh, attach metal foil tape, leave an external electrical interface, and cure to obtain the secondary processed mesh. S3. Apply heat-resistant adhesive to the outside of the secondary processed mesh, bond and fix the polyimide film to the heat-resistant adhesive, and heat to cure to obtain the tertiary processed mesh. S4. Fix the three-stage processed mesh to the metal mesh frame, and energize the external power interface to obtain a high-mesh metal printing mesh that can be deblocked online by pulse.

5. The method for preparing a high-mesh metal printing screen capable of online pulse unblocking as described in claim 4, characterized in that: In S1, the process parameters for plasma deposition of the enhanced inner layer are: argon flow rate 40-80 sccm, methylsilane flow rate 5-15 sccm, chamber pressure 10-50 Pa, substrate temperature 60-120℃, RF frequency 13-15 MHz, power 80-180 W, and deposition time 20-90 s.

6. The method for preparing a high-mesh metal printing screen capable of online pulse unblocking as described in claim 4, characterized in that: In S1, the process parameters for plasma deposition of the low surface energy wear-resistant outer layer are: argon flow rate 50-80 sccm, Si4F8 flow rate 13-18 sccm, cavity pressure 80-150 Pa, substrate temperature 80-120℃, RF power 20-40 W, and deposition time 20-60 s.

7. The method for preparing a high-mesh metal printing screen capable of online pulse unblocking as described in claim 4, characterized in that: In S2, the curing temperature is 100-150℃ and the curing time is 30-60min.

8. The method for preparing a high-mesh metal printing screen capable of online pulse unblocking as described in claim 4, characterized in that: In S3, the heating and curing temperature is 200-250℃, and the heating and curing time is 30-50 minutes.

9. The method for preparing a high-mesh metal printing screen capable of online pulse unblocking as described in claim 4, characterized in that: In S4, the three-stage treated mesh body is fixed by bonding, and polyurethane frame adhesive is used to bond the mesh body to the metal frame.

10. The application of the high-mesh metal printing screen capable of online pulse unblocking as described in any one of claims 1-3 in the preparation of printing screens.

Images