Screen printing plate gasket, and preparation method, screen printing method and application equipment thereof

Abstract

The invention relates to the technical field of silk-screen printing, in particular to a silk-screen printing plate gasket, a preparation method thereof, a silk-screen printing method and application equipment, a multifunctional composite gasket used for silk-screen printing of vehicle-mounted glass, mobile phone glass, watch glass, tablet personal computer shells, plastic and acrylic products, a preparation method of the multifunctional composite gasket, a high-precision silk-screen printing control method and special equipment. The invention relates to a preparation method of a silk-screen plate gasket. The preparation method comprises the following steps: A1, stirring and mixing polypropylene particles and glass fibers; a2, injecting the mixture into a mold, and carrying out injection molding to form a matrix layer; and A3, in the injection molding process, an anti-skid functional layer is generated on the lower surface of the mold in situ. The contact part of the upper surface of the gasket and the silk-screen printing plate is precisely matched with a corresponding structure at the bottom of the silk-screen printing plate through the high-viscosity double-faced adhesive tape, stable supporting and positioning of the silk-screen printing plate are achieved, displacement of the silk-screen printing plate in the printing process is effectively prevented, and the surface of a product can be evenly coated with ink.

Description

Technical Field

[0001] This invention relates to the field of screen printing technology, specifically to a screen printing stencil gasket and its preparation method, screen printing method and application equipment, a multifunctional composite gasket for screen printing on automotive glass, mobile phone glass, watch glass, tablet computer casings, plastic and acrylic products, and its preparation method, high-precision screen printing control method and special equipment. Background Technology

[0002] In the field of screen printing, the flatness, spacing control, and pressure uniformity between the screen printing stencil and the product are key factors determining the quality of screen printing. Currently, traditional screen printing processes suffer from several problems that urgently need to be addressed: First, precise control of the spacing between the stencil and the product surface is difficult, directly leading to uneven ink coating thickness and affecting the product's appearance and performance. Second, during the printing process, uneven pressure distribution easily results in defects such as blurred patterns and broken lines, severely reducing print quality and significantly impacting production efficiency. Third, existing gasket structures and materials are significantly insufficient in terms of durability, stability, corrosion resistance, and flatness, failing to meet the growing demands for high-precision, high-quality screen printing production. Therefore, developing a screen printing technology and related equipment that can effectively solve these problems is of significant practical importance. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, this application intends to provide a screen printing stencil pad and its manufacturing method, as well as a screen printing method and screen printing equipment using the pad, to achieve the technical effect of precise control of stencil spacing and ink thickness deviation ≤ ±0.5μm.

[0004] This application discloses a method for preparing a screen printing stencil pad, including: A1. Mix polypropylene granules with glass fiber; A2. Inject the mixture into the mold and injection mold it into a base layer; A3. An anti-slip functional layer is generated in situ on the lower surface of the mold during the injection molding process.

[0005] Furthermore, the glass fiber accounts for 15%-25% of the total mass of the matrix layer, and the fiber length is 50-100μm.

[0006] Furthermore, in step A1, the stirring temperature is 150-220℃ and the stirring time is 10-25 minutes.

[0007] Furthermore, in step A2, the injection molding pressure is 60-100MPa, the temperature is 30-60℃, and the cooling time is 2-5 minutes.

[0008] This application also discloses a screen printing stencil pad manufactured using the above-described screen printing stencil pad preparation method, comprising: Matrix layer; An anti-slip functional layer covers the lower surface of the substrate layer.

[0009] Furthermore, the anti-slip functional layer is an AG silicone coating.

[0010] Furthermore, the thickness of the screen printing stencil pad is 0.3mm-2.0mm.

[0011] This application discloses a screen printing method using the above-mentioned screen printing stencil pad, including: B1. Select a matching screen printing stencil pad based on the product thickness; B2. Attach the screen printing stencil spacer to the edge of the screen printing stencil pattern, controlling the distance between the screen printing stencil spacer and the pattern edge to be 0.5-0.8mm; B3. Start the screen printing equipment and use spacers to maintain a constant distance between the screen and the product surface.

[0012] Furthermore, the spacing control accuracy in step B3 is ±0.02mm, and the ink thickness deviation is ≤±0.5μm.

[0013] This application discloses a screen printing device employing the above-described screen printing method, comprising a screen printing stencil and a squeegee, and further comprising: Screen printing stencil spacer, detachably installed on the edge of the screen printing stencil; and, The thickness recognition system uses a laser rangefinder to detect the thickness of the screen printing plate pad in real time and sends the feedback to the control terminal. Compared with the prior art, this application has at least the following beneficial effects:

[0014] 1. Existing technologies use multiple layers of Teflon, resulting in poor flatness and an inability to precisely adjust the distance between the screen and the product. This leads to an error greater than ±0.2mm, causing ink splattering and resulting in ink overflow / jagged edges if the distance is too large, or the screen sticking to the product if the distance is too small. In contrast, the gasket in this application uses high-viscosity double-sided adhesive to precisely match the corresponding structure on the bottom of the screen, achieving stable support and positioning of the screen. This effectively prevents the screen from shifting during printing, allowing the ink to be evenly coated on the product surface. This effectively avoids defects such as blurry patterns and broken lines, significantly improving the clarity and accuracy of the screen-printed pattern and enhancing the printing quality of the product. To achieve precise control of the distance between the screen and the product, the gasket has different thicknesses ranging from 0.3mm to 2.0mm, meeting the stringent requirements of different screen printing processes for the distance between the screen and the product. 2. Existing technologies using multi-layered Teflon sheets suffer from poor flatness, solvent resistance, and wear resistance, resulting in a service life of less than 10,000 cycles. Frequent replacements lead to downtime and losses. In contrast, the gasket body of this application is made of PP (polypropylene), a material with good chemical stability, corrosion resistance, and a certain degree of elasticity. Furthermore, glass fiber is added to the PP material, enhancing the gasket's hardness and corrosion resistance, extending its service life to over 200,000 cycles. In addition, this application coats the lower surface of the gasket, where it contacts the product, with a special AG silicone anti-slip coating 0.01 mm thick. This coating possesses high friction and flexibility, preventing the gasket from sliding or shifting during printing and avoiding damage to the product surface. Attached Figure Description Figure 1 This application includes a schematic diagram of the screen printing plate gasket structure. In the image, 1. Screen pattern; 2. Screen; 3. PP material gasket; 4. Product; 5. Machine table. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, 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.

[0016] A method for preparing a screen printing stencil pad, comprising: A1. Mix polypropylene granules with glass fiber at a stirring temperature of 150-220℃ for 10-25 minutes. A2. Inject the mixture into a mold and injection mold it into a matrix layer. The glass fiber accounts for 15%-25% of the total mass of the matrix layer, and the fiber length is 50-100 μm. The injection molding pressure is 60-100 MPa, the temperature is 30-60℃, and the mixture is cooled for 2-5 minutes. A3. An anti-slip functional layer is generated in situ on the lower surface of the mold during the injection molding process.

[0017] Please refer to Figure 1 The screen printing stencil pad prepared using the above-described method comprises: a substrate layer; and an anti-slip functional layer, wherein the anti-slip functional layer is an AG silicone coating covering the lower surface of the substrate layer. The thickness of the screen printing stencil pad is 0.3mm-1.3mm.

[0018] The screen printing method using the above-mentioned screen printing stencil pad includes: B1. Select a matching screen printing stencil pad based on the product thickness; B2. Adhere the screen printing stencil pad to the edge of the screen printing stencil pattern. The adhesion is done using double-sided tape with a holding power of ≥100min. The distance between the screen printing stencil pad and the edge of the pattern is controlled to be 0.5-0.8mm. B3. Start the screen printing equipment and maintain a constant distance between the screen and the product surface using a shim. The distance control accuracy is ±0.02mm, and the ink thickness deviation is ≤±0.5μm.

[0019] The screen printing equipment using the above screen printing method includes a screen printing stencil and a squeegee, and also includes: Screen printing stencil spacer, detachably installed on the edge of the screen printing stencil; and, The thickness recognition system uses a laser rangefinder to detect the thickness of the screen printing plate pad in real time and feeds it back to the control terminal; the detection frequency of the thickness recognition system is ≥1000 times / second, and the control terminal dynamically adjusts the doctor blade pressure based on the detection data.

[0020] Example 1 1. Gasket Preparation: Polypropylene granules and glass fibers (15wt%, 50μm in length) are placed in a mixer and stirred at 150℃ for 10 minutes (300rpm). Injection Molding: Pressure 60MPa, mold temperature 30℃, cooling for 2 minutes; Simultaneously, an AG silicone anti-slip layer (0.05mm thick) is coated inside the mold. Finished Product Thickness: 0.3mm 2. Screen printing application: Double-sided adhesive holding power 100min; gasket-pattern spacing 0.5mm; screen-substrate spacing 0.38mm (control accuracy ±0.02mm); ink thickness deviation +0.5μm.

[0021] Example 2 1. Gasket preparation: Unlike Example 1, the glass fiber content is 25 wt%, length 100 μm; stirring at 220°C for 25 minutes (400 rpm); injection molding: pressure 100 MPa, mold temperature 60°C, cooling for 5 minutes; AG silicone layer thickness 0.10 mm. Finished product thickness: 1.3 mm 2. Screen printing application: The difference from Example 1 is that the holding power is 120 min; the spacer-pattern spacing is 0.8 mm; the screen spacing is 0.42 mm; and the ink thickness deviation is -0.5 μm.

[0022] Example 3 Gasket preparation: Unlike Example 1, the glass fiber content is 20wt% and the length is 75μm; stirring is carried out at 185°C for 18 minutes (350rpm); injection molding: pressure 80MPa, mold temperature 45°C, cooling for 3.5 minutes, AG silicone layer thickness 0.07mm. Finished product thickness: 0.8mm.

[0023] Screen printing application: The difference from Example 1 is that the holding power is 150 min; the gasket-pattern spacing is 0.65 mm; the screen spacing is 0.40 mm; and the ink thickness deviation is ±0.2 μm (optimal value). Example 4: Screen printing on vehicle glass frame

[0024] 1. Parameter Configuration Gasket specifications: 1.3mm (AG coating friction coefficient 1.8); Spacing control: 0.8mm ± 0.02mm; Ink thickness: 12μm±0.4μm.

[0025] 2. Operating Procedures Select a 1.3mm shim → Apply high-viscosity tape to the screen border; Laser rangefinder calibration → Control terminal setting scraper pressure to 85N; Continuous printing of 500,000 sheets → Zero-adhesion plate, no wear on the gasket.

[0026] Example 5: Screen printing of logo on mobile phone glass 1. Key Adjustments Replace with 0.6mm shims → spacing 0.5mm; Dynamic voltage regulation response frequency: 1200 times / second.

[0027] 2. Effect Verification bad type Traditional gaskets The gasket of the present invention Logo broken line 8% 0% Ink Smudges 5% 0.2% Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a screen printing stencil pad, characterized in that, include: A1. Mix polypropylene granules with glass fiber; A2. Inject the mixture into the mold and injection mold it into a base layer; A3. An anti-slip functional layer is generated in situ on the lower surface of the mold during the injection molding process.

2. The method for preparing the screen printing plate pad according to claim 1, characterized in that, In step A1, glass fibers account for 15%-25% of the total mass of the matrix layer, and the fiber length is 50-100μm.

3. The method for preparing the screen printing plate pad according to claim 1, characterized in that, In step A1, the stirring temperature is 150-220℃ and the stirring time is 10-25 minutes.

4. The method for preparing the screen printing plate pad according to claim 1, characterized in that, In step A2, the injection pressure is 60-100MPa, the temperature is 30-60℃, and the cooling time is 2-5 minutes.

5. A screen printing stencil pad manufactured using the preparation method of any one of claims 1-4, characterized in that, include: Matrix layer; An anti-slip functional layer covers the lower surface of the substrate layer.

6. The screen printing stencil gasket according to claim 5, characterized in that: The anti-slip functional layer is an AG silicone coating.

7. The screen printing stencil pad according to claim 5, characterized in that: The thickness of the screen printing stencil pad is 0.3mm-2.0mm.

8. A screen printing method using the screen printing stencil pad as described in claim 5, characterized in that, include: B1. Select a matching screen printing stencil pad based on the product thickness; B2. Attach the screen printing stencil spacer to the edge of the screen printing stencil pattern, controlling the distance between the screen printing stencil spacer and the pattern edge to be 0.5-0.8mm; B3. Start the screen printing equipment and use spacers to maintain a constant distance and flatness between the screen and the product surface.

9. The screen printing method according to claim 8, characterized in that: The spacing control accuracy in step B3 is ±0.02mm, and the ink thickness deviation is ≤±0.5μm.

10. A screen printing device employing the screen printing method of claim 8, comprising a screen printing stencil and a squeegee, characterized in that, Also includes: Screen printing stencil spacer, which can be detachably installed on the edge of the screen printing stencil; and, The thickness recognition system uses a laser rangefinder to detect the thickness of the screen printing plate pad in real time and sends the feedback to the control terminal.

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