Screen printing plate manufacturing method and screen printing plate

Abstract

The application discloses a silk screen plate manufacturing method and a silk screen plate, and belongs to the technical field of screen printing. The method comprises the following steps: preparing a screen plate after a developing manufacturing process; the screen plate has a pattern layer formed by photosensitive glue; applying curing liquid on the pattern layer to form a protective film layer on the pattern layer; cleaning the curing liquid in the screen plate hole of the screen plate to obtain a screen plate with a protective film layer; and performing a post-treatment process on the screen plate with the protective film layer to obtain the silk screen plate. By uniformly applying the curing liquid on the pattern layer, the curing liquid and the photosensitive glue of the non-pattern layer intersecting with the edge of the pattern layer will have a strong cross-linking reaction to strengthen the bonding force between the photosensitive glue and the screen plate. Meanwhile, the curing liquid in other areas of the pattern layer can form a protective film on the surface of the pattern layer after hardening, which reduces the direct contact between the screen plate and the ink, thereby reducing the corrosion of the ink on the screen plate, and further reducing the damage rate of the silk screen plate.

Description

Technical Field

[0001] This application relates to the field of screen printing technology, and in particular to a method for manufacturing a screen printing stencil and the screen printing stencil itself. Background Technology

[0002] In existing technologies, screen printing mainly involves sealing excess mesh areas with a screen adhesive, pouring ink onto one end of the screen printing plate, and applying pressure to the ink area using a squeegee while moving it towards the other end of the plate. During this movement, the ink is forced from the mesh openings of the pattern layer onto the substrate by the squeegee.

[0003] However, during the use of screen printing stencils, due to the frequent pressure applied by the stencil and squeegee of the screen printing machine, the pattern layer may be scratched by the stencil and squeegee as they move to the edge of the pattern layer. In addition, the photosensitive emulsion in the non-pattern layer that intersects with the pattern layer is prone to falling off, resulting in a high damage rate of the screen printing stencil.

[0004] Application content

[0005] The main purpose of this application is to provide a method for manufacturing a screen printing stencil and a screen printing stencil, aiming to solve the technical problem of high damage rate of screen printing stencils.

[0006] To achieve the above objectives, this application provides a method for manufacturing a screen printing stencil, comprising:

[0007] A screen printing plate is prepared after the developing process is completed; the screen printing plate has a pattern layer formed by photosensitive emulsion;

[0008] A curing liquid is applied to the pattern layer to form a protective film layer on the pattern layer;

[0009] Clean the curing liquid inside the mesh holes of the mesh to obtain a mesh with a protective film layer;

[0010] The screen printing stencil with the protective film layer is subjected to a post-processing step to obtain the screen printing stencil.

[0011] Optionally, the curing liquid is obtained by uniformly mixing a first curing agent and a second curing agent at a mass ratio of (1-1.5):(0.8-1.2).

[0012] Optionally, the step of uniformly applying a curing liquid onto the pattern layer to form a protective film layer on the pattern layer includes:

[0013] A curing liquid is applied to the two end regions and the middle region along the long side direction of the patterned layer to form the protective film layer in both the end regions and the middle region; wherein the middle region is spaced apart from each of the end regions.

[0014] Optionally, the step of uniformly applying a curing liquid onto the pattern layer to form a protective film layer on the pattern layer includes:

[0015] Apply curing liquid to the pattern layer along the width direction of the pattern layer.

[0016] Optionally, the width of the two end regions is 200mm-300mm; and / or

[0017] The width of the intermediate region is 200mm-300mm.

[0018] Optionally, cleaning the curing liquid inside the mesh holes of the mesh to obtain a mesh with a protective film layer includes:

[0019] Excess curing liquid is removed from the mesh holes of the mesh to obtain a mesh with a protective film layer.

[0020] Optionally, the post-processing step for the mesh plate with the protective film layer includes:

[0021] The screen printing plate with the protective film layer is baked, inspected, repaired, and subjected to secondary exposure in sequence to obtain the screen printing plate.

[0022] Secondly, this application provides a screen printing stencil, the screen printing stencil comprising:

[0023] Screen printing stencil body;

[0024] A pattern layer, wherein the pattern layer is disposed on one sidewall of the screen printing stencil body; and

[0025] A protective film layer is disposed on the side wall of the pattern layer opposite to the screen printing body, and the protective film layer is formed by curing with a curing liquid.

[0026] Optionally, the protective film layer includes:

[0027] Two first protective film layers, each of which is disposed at the end region of the long side of the pattern layer;

[0028] The second protective film layer is disposed in the middle region along the long side of the patterned layer; wherein the middle region is spaced apart from each of the end regions.

[0029] Optionally, the width of the first protective film layer is 200mm-300mm; and / or

[0030] The width of the second protective membrane layer is 200mm-300mm.

[0031] This application provides a method for manufacturing a screen printing stencil, which involves preparing a stencil that has completed the developing process; the stencil has a pattern layer formed by photosensitive emulsion; a curing liquid is uniformly applied to the pattern layer to form a protective film layer; the curing liquid in the stencil holes is cleaned to obtain a stencil with a protective film layer; and a post-processing process is performed on the stencil with the protective film layer to obtain the screen printing stencil.

[0032] Therefore, in this application, after the screen printing stencil is developed, a curing liquid is evenly applied to the pattern layer. The curing liquid undergoes a strong cross-linking reaction with the photosensitive emulsion in the non-pattern layer where the pattern layer intersects, thereby strengthening the adhesion between the photosensitive emulsion and the screen printing stencil. Simultaneously, after the curing liquid in the areas of the pattern layer other than the edges hardens, it forms a protective film on the surface of the pattern layer, reducing direct contact between the screen printing stencil and the ink, thus reducing ink corrosion of the screen printing stencil and consequently lowering the damage rate of the screen printing stencil. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of the screen printing plate for this application;

[0034] Figure 2 This is a schematic diagram showing the placement of the first and second protective film layers in a symmetrical pattern layer according to this application.

[0035] Figure 3 This is a schematic diagram showing the placement of the first and second protective film layers in an asymmetrical pattern layer.

[0036] Figure 4 This is a flowchart illustrating the first embodiment of the screen printing stencil manufacturing method of this application;

[0037] Figure 5 This is a schematic diagram of the patterned layer and the non-patterned layer of this application;

[0038] Figure 6 This is a flowchart illustrating the second embodiment of the screen printing stencil manufacturing method of this application.

[0039] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0040] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0041] In the existing technology, during the use of screen printing stencils, the stencils are frequently subjected to pressure from the glue knife and squeegee. As the glue knife and squeegee of the screen printing machine move to the edge of the pattern layer of the stencil, the pattern layer is scratched by the glue knife and squeegee, and the photosensitive emulsion in the non-pattern layer that intersects with the pattern layer is easy to fall off, resulting in a high damage rate of the screen printing stencils.

[0042] This application provides a solution whereby, after the screen printing stencil is developed, a curing liquid is evenly applied to the pattern layer. The curing liquid undergoes a strong cross-linking reaction with the photosensitive emulsion in the non-pattern layer where the pattern layer intersects, thereby strengthening the adhesion between the photosensitive emulsion and the screen printing stencil. Simultaneously, after curing, the curing liquid in the areas of the pattern layer other than the edges forms a protective film on the surface of the pattern layer, reducing direct contact between the screen printing stencil and the ink, thus reducing ink corrosion of the screen printing stencil and consequently lowering the damage rate of the screen printing stencil.

[0043] The following embodiments of this application will illustrate the specific structure of the screen printing stencil of this application.

[0044] Reference Figure 1 , Figure 1 This is a schematic diagram of the structure of the screen printing stencil of this application. The screen printing stencil includes a screen printing stencil body 1, a pattern layer 2, and a protective film layer 3.

[0045] The pattern layer 2 is disposed on one side wall of the screen printing plate body 1; the protective film layer 3 is disposed on the side wall of the pattern layer 2 opposite to the screen printing plate body 1, and the protective film layer 3 is made by curing with a curing liquid.

[0046] Specifically, a certain thickness of photosensitive emulsion is applied to one sidewall of the screen printing plate body 1. After baking the screen printing plate body 1 with the photosensitive emulsion applied, the film with the stencil pattern is attached to it and placed into an exposure machine for exposure. During the exposure process, the photosensitive emulsion in the part of the screen printing plate body 1 that is blocked by the film does not cure because it is not exposed to light, while the photosensitive emulsion in the part that is not blocked by the film cures when exposed to light. Since the uncured photosensitive emulsion is easily soluble in water, after the exposure is completed, the screen printing plate body 1 is rinsed with water. After the photosensitive emulsion in the part blocked by the film dissolves in the water, a pattern layer 2 is formed on one sidewall of the screen printing plate body 1.

[0047] Understandably, after the pattern layer 2 is formed on one sidewall of the screen printing stencil body 1, the pattern layer 2 is separated from the non-patterned layer by the cured photosensitive emulsion. Therefore, during printing using the screen printing stencil, the frequent contact between the cured photosensitive emulsion and the squeegee between the pattern layer 2 and the non-patterned layer makes the photosensitive emulsion in this area easily scraped off or split. Therefore, to avoid the above situation, a curing liquid needs to be applied to the sidewall of the pattern layer 2 facing away from the screen printing stencil body. When the photosensitive emulsion and the curing liquid come into contact between the pattern layer 2 and the non-patterned layer, a strong cross-linking reaction occurs between the curing liquid and the photosensitive emulsion, forming a protective film layer 3 on the sidewall of the pattern layer 2 facing away from the screen printing stencil body 1.

[0048] As an optional implementation, a left first protective film layer 31 and a right first protective film layer 33 can be respectively provided at the two end regions along the long side of the pattern layer 2, and a second protective film layer 32 can be provided in the middle region along the long side of the pattern layer. Optionally, the width of the left first protective film layer 31 and the left second protective film layer 33 can be set to 200mm-300mm, and the width of the second protective film layer 32 can also be set to 200mm-300mm. This embodiment does not limit this.

[0049] Please refer to Figure 2 and Figure 3 The central region is a strip-shaped area extending along the width direction near the center line of the long side of the pattern layer, with each side of the strip-shaped area spaced apart from the corresponding end regions. The distances from the two sides of the central region to the corresponding end regions can be equal, or the central region can be close to any end region.

[0050] If pattern layer 2 is a symmetrical pattern, then the second protective film layer can be placed at the exact center of the pattern layer. Figure 2 As shown. When the pattern layer is asymmetrical, such as when a sharp corner area appears on the right side of pattern layer 2, the photosensitive adhesive in the sharp corner area is more easily scratched off. Therefore, the second protective film can be placed in the area near the right end of the pattern layer, as shown. Figure 3 As shown. Figure 2 and Figure 3 The thickened part of the middle line represents the area where the first and second protective film layers are set in the pattern layer.

[0051] In this embodiment, by providing a protective film layer 3 in the pattern layer 2 on one side wall of the screen printing stencil body 1, the direct contact between the stencil and the ink can be reduced, thereby reducing the corrosion of the stencil by the ink and thus reducing the damage rate of the screen printing stencil.

[0052] This application provides a first embodiment of a method for manufacturing a screen printing stencil. (Refer to...) Figure 4 , Figure 4A flowchart illustrating the first embodiment of the screen printing stencil manufacturing method of this application is shown.

[0053] It should be noted that although the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than that shown here.

[0054] In this embodiment, the method for manufacturing the screen printing stencil includes:

[0055] Step S10: Prepare a screen plate that has completed the developing process; the screen plate has a pattern layer formed by photosensitive emulsion.

[0056] Specifically, the standard screen printing process is as follows: screen cleaning → screen stretching → degreasing → baking → coating → baking → exposure → development → baking → inspection → repair → second exposure → warehousing / production. This embodiment adds a "curing" step after the existing developing process is completed.

[0057] As is understandable, screen printing utilizes the basic principle that ink passes through the perforations in the patterned areas of the screen, while ink does not pass through the perforations in the non-patterned areas. Specifically, during the screen printing process, a certain thickness of photosensitive emulsion (usually diazo salt photosensitive emulsion) is applied to the stretched screen. After baking the applied photosensitive emulsion, a film with a cutout pattern is attached to it and placed in an exposure machine for exposure. During exposure, the photosensitive emulsion in the areas of the screen blocked by the film does not cure because it is not exposed to light, while the photosensitive emulsion in the areas not blocked by the film cures. After rinsing with water, the uncured photosensitive emulsion dissolves in the water, thus forming the patterned layer 10 and the non-patterned layer 20 on the screen 100. The patterned layer 10 and the non-patterned area are separated by photosensitive emulsion 30. (See [reference needed] for details.) Figure 5 .

[0058] Step S20: Apply curing liquid evenly to the pattern layer to form a protective film layer on the pattern layer.

[0059] Step S30: Clean the curing liquid inside the mesh holes of the mesh plate to obtain a mesh plate with a protective film layer.

[0060] Step S40: Perform a post-processing process on the screen with the protective film layer to obtain the screen printing screen.

[0061] In this embodiment, the curing liquid is a substance or mixture that enhances or controls the curing reaction, and it is mainly used as a crosslinking agent and initiator in the synthesis of rubber and plastics. In one example, the curing liquid can be obtained by uniformly mixing a first curing agent and a second curing agent at a mass ratio of (1-1.5):(0.8-1.2), wherein the first curing agent and the second curing agent are any two of the following curing agents: cyclohexanone peroxide, dicumyl peroxide, benzoyl peroxide, di-tert-butyl peroxide, and dicumyl peroxide.

[0062] Optionally, a first embodiment is proposed, in which the first curing liquid and the second curing liquid are uniformly mixed at a mass ratio of 1:1.2 to obtain the curing liquid.

[0063] Optionally, a second embodiment is proposed, in which the first curing liquid and the second curing liquid are uniformly mixed at a mass ratio of 1.5:0.8 to obtain the curing liquid.

[0064] Optionally, a third embodiment is proposed, in which the first curing liquid and the second curing liquid are mixed uniformly at a mass ratio of 1:1 to obtain the curing liquid.

[0065] Compared to other embodiments, the curing liquid prepared in Example 3 has a better curing effect.

[0066] Specifically, the non-patterned layer intersecting with the patterned layer contains cured photosensitive emulsion. After the curing liquid is evenly applied to the patterned layer, when the curing liquid at the edge of the patterned layer comes into contact with the photosensitive emulsion at the non-patterned edge, a strong cross-linking reaction occurs between the curing liquid and the photosensitive emulsion. This strengthens the adhesion between the photosensitive emulsion and the screen printing plate, reducing the probability of the photosensitive emulsion peeling off. Simultaneously, the curing liquid can also form a protective film at the non-patterned edge to prevent the photosensitive emulsion at the intersection with the patterned layer from being scratched by the screen printing machine's squeegee.

[0067] Understandably, after the curing liquid forms a protective film on the pattern layer, it is necessary to clean the excess curing liquid from the stencil holes to prevent the curing liquid from drying and forming a smear that clogs the stencil holes during subsequent processing of the stencil with the protective film. This would prevent the ink from being squeezed from the pattern layer holes onto the substrate by the stencil blades and squeegees of the screen printing machine during the movement of the stencil, resulting in printing failure.

[0068] Therefore, the application of curing liquid uniformly on the pattern layer after the screen printing stencil development has the following beneficial effects: 1. The uniform application of curing liquid on the pattern layer causes a strong cross-linking reaction between the curing liquid and the photosensitive emulsion in the non-pattern layer at the edge of the pattern layer, thereby strengthening the adhesion between the photosensitive emulsion and the screen printing stencil and reducing the probability of photosensitive emulsion peeling off; 2. After the curing liquid on the surface of the pattern layer hardens, a protective film is formed on the surface of the pattern layer of the screen printing stencil, reducing direct contact between the screen printing stencil and the ink, thereby reducing the corrosion of the screen printing stencil by the ink and thus reducing the damage rate of the screen printing stencil; 3. Since the screen printing stencil is not yet used after development, there are no adhesive or ink stains on the surface of the screen mesh. Therefore, applying curing liquid to the pattern layer after development can extend the service life of the protective film formed by the curing liquid on the surface of the screen printing stencil. 4. Screen printing plates made using traditional production processes can only be printed about 8,000 times in production. However, by using the production method of this application, the number of printing times can be increased from 8,000 to 12,000-15,000 times, thereby stabilizing the production rhythm of the production line, saving a lot of manpower and material resources, and reducing the workload of workers on the production line.

[0069] Furthermore, as an example, refer to Figure 6 This application provides a second embodiment of a method for manufacturing screen printing stencils, based on the above. Figure 6 In the embodiment shown, step S20 is adaptively changed to:

[0070] Step S201: Apply curing liquid to both end areas and the middle area along the long side of the pattern layer to form the protective film layer in both the end areas and the middle area.

[0071] The middle region is spaced apart from each of the end regions.

[0072] In one example, during screen printing using a screen printing stencil, the squeegee typically moves from one end of the stencil to the other along its long side. Therefore, to prevent the photosensitive emulsion from peeling off from the non-image edge areas where it intersects with the pattern layer, curing liquid needs to be applied to both ends of the pattern layer along its long side. Simultaneously, to prevent the middle area of ​​the pattern layer from being scratched by the squeegee during contact with the substrate, curing liquid also needs to be applied to the middle area of ​​the pattern layer, thus forming a protective film on both ends and the middle area of ​​the pattern layer.

[0073] Specifically, after the stencil has been developed, it can be fixed on a trapezoidal platform to facilitate the application of curing solution. After fixing the stencil, cyclohexanone peroxide and dicumyl peroxide are mixed evenly at a mass ratio of 1:1 to obtain the curing solution. The curing solution can be applied evenly once along the width of the pattern layer at both ends and the middle area of ​​the pattern layer using a sponge or lint-free cloth.

[0074] Optionally, the width of the curing liquid applied to both ends can be 200mm-300mm, and the width of the curing liquid applied to the middle area can also be 200mm-300mm. This application does not impose any restrictions on this.

[0075] In another example, if the screen printing machine's glue knife moves from one end of the screen printing stencil to the other in the width direction, the curing liquid can be evenly applied to the two end areas and the middle area in the width direction of the pattern layer. The specific application method can be referred to the example above, and will not be repeated here.

[0076] As an optional implementation, after applying curing liquid to the two end areas and the middle area along the long side of the pattern layer, the curing liquid in the mesh holes of the stencil can be blown away to obtain a stencil with a protective film layer.

[0077] It is understandable that when applying curing liquid to the two ends and the middle area of ​​the pattern layer of the stencil using a sponge or lint-free cloth, there will inevitably be excess curing liquid in the stencil holes. Therefore, before performing baking, inspection, repair and secondary exposure processes on the stencil with the protective film layer, it is necessary to blow away the excess curing liquid in the stencil holes to prevent the curing liquid in the stencil holes from forming a film that blocks the stencil holes.

[0078] Specifically, an air gun can be used to blow air through the patterned areas at both ends and in the middle of the stencil layer, sequentially from top to bottom. During this process, the air gun must be moved slowly to avoid skipping or missing areas, as this can cause the curing liquid to remain and form a film, clogging the stencil holes and rendering the stencil unusable. The air pressure of the air gun can be 0.5 MPa, but this embodiment does not limit this setting. Alternatively, excess curing liquid can be absorbed with a clean cloth.

[0079] In this embodiment, excess curing liquid in the mesh plate holes can be blown away with an air gun or absorbed with a clean cloth. This can prevent the curing liquid in the mesh plate holes from forming a mesh film that blocks the mesh plate holes, thereby reducing the probability of the mesh plate being scrapped.

[0080] In this embodiment, curing liquid is applied to both ends and the middle area of ​​the pattern layer according to the moving direction of the screen printing machine's glue knife and squeegee. That is, curing liquid is applied in the long side or width direction of the pattern layer. The position of the curing agent can be flexibly adjusted to prevent the photosensitive adhesive in non-image edge areas from falling off due to frequent contact with the screen printing machine's glue knife and squeegee.

[0081] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A method of making a screen printing plate, characterized by, The method comprises: A screen plate is prepared after a developing process; the screen plate has a pattern layer formed by a photosensitive glue; A curing liquid is uniformly applied on the pattern layer to form a protective film layer on the pattern layer; the curing liquid is obtained by uniformly mixing a first curing agent and a second curing agent at a mass ratio of (1-1.5):(0.8-1.2), the first curing agent and the second curing agent are any two of cyclohexanone peroxide, dicumyl peroxide, benzoyl peroxide, di-tert-butyl peroxide and diisopropylbenzene hydroperoxide; and the curing liquid and the photosensitive glue have a strong cross-linking reaction. The curing liquid in the screen plate hole of the screen plate is cleaned to obtain a screen plate with a protective film layer; A post-processing process is performed on the screen plate with the protective film layer to obtain the screen printing screen plate.

2. The method of claim 1, wherein, The method comprises: The curing liquid is applied on both side end regions and a middle region of the pattern layer in the long direction of the pattern layer to form the protective film layer on the end regions and the middle region; and the middle region is spaced apart from each of the end regions.

3. The method of claim 1, wherein, The method comprises: The curing liquid is applied on the pattern layer in the width direction of the pattern layer.

4. The method of claim 2, wherein, The width of the two side end regions is 200-300 mm; and / or The width of the middle region is 200-300 mm.

5. The method of claim 1, wherein, The method comprises: The excess curing liquid in the screen plate hole of the screen plate is sucked to obtain a screen plate with a protective film layer.

6. The method of claim 1, wherein, The method comprises: The screen plate with the protective film layer is sequentially subjected to baking, inspection, repair and secondary exposure to obtain the screen printing screen plate.

7. A silk screen plate characterized by, The screen printing screen plate comprises: A screen printing screen plate body; A pattern layer formed by a photosensitive glue is arranged on one side wall of the screen printing screen plate body; and A protective film layer is arranged on the side wall of the pattern layer away from the screen printing screen plate body, and the protective film layer is made of a curing liquid obtained by uniformly mixing a first curing agent and a second curing agent at a mass ratio of (1-1.5):(0.8-1.2), the first curing agent and the second curing agent are any two of cyclohexanone peroxide, dicumyl peroxide, benzoyl peroxide, di-tert-butyl peroxide and diisopropylbenzene hydroperoxide; and the curing liquid and the photosensitive glue have a strong cross-linking reaction when the curing liquid is uniformly applied on the pattern layer.

8. The silk screen printing plate of claim 7, wherein, The protective film layer comprises: Two first protective film layers are arranged on the end regions in the long direction of the pattern layer; A second protective film layer is arranged on the middle region in the long direction of the pattern layer; and the middle region is spaced apart from each of the end regions.

9. The silk screen printing plate of claim 8, wherein, The width of the first protective film layer is 200-300 mm; and / or The width of the second protective film layer is 200mm-300mm.

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