A prism sheet ink coating device

Abstract

This utility model relates to the field of screen printing equipment technology, specifically to a prism sheet ink coating device, including a frame, a printing platform, and a screen. Two ink feeding boxes are symmetrically arranged on the top of the frame, and each ink feeding box is connected to an inclined conveying channel at its bottom. The printing platform is equipped with a lifting mechanism. A removable flat pressure plate is placed above the screen, the area of ​​which is equal to the effective working area of ​​the screen. A double-scraper mechanism is correspondingly arranged at the outlet end of the conveying channel. The ink formula is injected into the ink feeding box, and the ink flows through the conveying channel to the double-scraper mechanism. The flat pressure plate presses down vertically, causing the ink to be extruded through the gradient dots of the screen, thus pressing the ink onto the substrate and avoiding height differences. After using the flat pressure plate, it is removed. The double-scraper mechanism is then activated, and the screen is scraped twice by the double-scraper mechanism, eliminating the need for a return ink blade, thereby achieving an ink-free operation and preventing ink stagnation and solidification.

Description

Technical Field

[0001] This utility model relates to the field of screen printing equipment technology, and in particular to a prism sheet ink coating device. Background Technology

[0002] Traditional screen printing machines use a combination of a single squeegee and a back-inking blade, which has two major drawbacks: 1. The back-inking action increases the processing time, and the ink tends to solidify when it stagnates on the screen; 2. The horizontal movement of the squeegee can scratch the prism-shaped light-gathering structure of the prism sheet, producing white spots and debris that result in poor image brightness and cannot meet the requirements for eliminating shadows under high-brightness display conditions.

[0003] This application uses an inclined conveying channel to directly deliver ink to the doctor blade working area, eliminating the need for a return ink blade, thereby preventing ink from stagnating and solidifying. It also uses a flat pressure plate with the same area as the mesh for vertical printing to avoid damaging the PITCH structure. Summary of the Invention

[0004] The purpose of this invention is to provide a prism sheet ink coating device that can directly deliver ink to the doctor blade working area, eliminating the need for a return ink blade to prevent ink from stagnating and solidifying. It also uses a flat pressure plate with the same area as the mesh for vertical printing to avoid damaging the PITCH structure.

[0005] To achieve the above objectives, this utility model provides a prism sheet ink coating device, including a frame, a printing platform, and a screen. Two ink feeding boxes are symmetrically arranged on the top of the frame, and each ink feeding box is connected to an inclined conveying channel at its bottom. The printing platform is equipped with a lifting mechanism for fixing the prism sheet substrate. A removable flat pressure plate is placed above the screen, and the area of ​​the flat pressure plate is equal to the effective working area of ​​the screen. A double scraper mechanism, including a left scraper and a right scraper, is correspondingly arranged at the outlet end of the conveying channel, and both are connected to a pressure driving device.

[0006] The planar pressure plate has a pressure range of 0.5-2 MPa, and its bottom surface is covered with an elastic silicone layer.

[0007] The conveying channel has an inclination angle of 30°-45° and an anti-solidification coating on its inner wall.

[0008] The distance between the screen and the printing platform is fixed at 1-3mm, and the screen pattern is designed with a gradient dot distribution for the light and shadow area of ​​the prism.

[0009] The dual-scraper mechanism is synchronized, with the left scraper and the right scraper moving in opposite directions and at the same speed.

[0010] This utility model discloses a prism sheet ink coating device, comprising a frame, a printing platform, and a screen. Two ink feeding boxes are symmetrically arranged on the top of the frame. The printing platform is equipped with a lifting mechanism. A removable flat pressure plate is placed above the screen. A double-scraper mechanism, including a left scraper and a right scraper, is correspondingly arranged at the outlet end of the conveying channel. The ink formula is injected into the ink feeding boxes, and the ink flows through the conveying channel to the double-scraper mechanism. The flow rate is controlled at 20 mL / s by a piezoelectric valve. The flat pressure plate presses down vertically, causing the ink to pass through the screen. Gradient dots (aperture 50-200μm) are extruded, allowing ink to be pressed onto the substrate, avoiding height differences. After using the flat pressure plate, it is removed, and the dual-squeegee mechanism is activated. The tilt angle of the dual-squeegee mechanism is adjusted to 60° (relative to the plane of the screen). The gravitational force of the ink forms a self-flowing force, and the flow rate is stabilized at 0.5-1m / s, thus enabling the ink to be directly delivered to the squeegee working area. The screen will be scraped twice by the dual-squeegee mechanism, eliminating the need for the ink return blade, thereby achieving an ink return-free action and preventing ink stagnation and solidification. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0012] Figure 1 This is a schematic diagram of the overall structure of the prism sheet ink coating device according to the first embodiment of this utility model.

[0013] Figure 2 This is a front sectional view of the screen printing plate according to the first embodiment of this utility model.

[0014] Figure 3 This is a schematic diagram of the transmission channel according to the first embodiment of the present invention.

[0015] In the diagram: 1-frame, 2-printing platform, 3-screen, 11-ink feeding box, 12-conveyor channel, 21-lifting mechanism, 31-flat pressure plate, 4-double scraper mechanism, 41-left scraper, 42-right scraper, 311-elastic silicone layer, 121-anti-coagulation coating. Detailed Implementation

[0016] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0017] The first embodiment of this application is:

[0018] Please see Figures 1 to 3 ,in Figure 1This is a schematic diagram of the overall structure of a prism sheet ink coating equipment. Figure 2 This is a front sectional view of the screen version. Figure 3 This is a schematic diagram of the conveying channel. This utility model provides a prism sheet ink coating device: including a frame 1, a printing platform 2, and a screen 3. Two ink feeding boxes 4 are symmetrically arranged on the top of the frame 1. The printing platform 2 is equipped with a lifting mechanism 21. A removable flat pressure plate 31 is placed above the screen 3. A double scraper mechanism 4, including a left scraper 41 and a right scraper 42, is correspondingly arranged at the outlet end of the conveying channel 12. The aforementioned solution addresses two issues: 1) the increased time required for the ink return process, and the tendency for ink to solidify when stagnant on the screen 3; 2) the potential for the horizontal movement of the squeegee to scratch the prismatic light-gathering structure of the prism sheet, resulting in white spots and debris that cause poor image brightness and fail to meet the requirements for eliminating shadows under high-brightness display demands. It is understood that the aforementioned solution can directly deliver ink to the squeegee working area, eliminating the need for the ink return blade and thus preventing ink stagnation and solidification. The flat pressure plate 31 applies pressure to the screen 3, forcing the ink onto the substrate, avoiding height differences. After using the flat pressure plate 31, it is removed. With the left squeegee 41 and right squeegee 42, the screen 3 is scraped twice by the two squeegees during unidirectional movement, thereby eliminating the need for ink return and preventing ink stagnation and solidification.

[0019] In this specific embodiment, two ink feeding boxes 4 are symmetrically arranged on the top of the frame 1. Each ink feeding box 4 is connected to an inclined conveying channel 12 at its bottom. The printing platform 2 is equipped with a lifting mechanism 21 for fixing the prism sheet substrate. A flat pressure plate 31 is placed above the screen 3. The area of ​​the flat pressure plate 31 is equal to the effective working area of ​​the screen 3, and the flat pressure plate 31 can be manually removed from above the screen 3. A double squeegee mechanism 4, including a left squeegee 41 and a right squeegee 42, is correspondingly arranged at the outlet of the conveying channel 12, and both are connected to a pressure driving device. The lifting mechanism 21 raises the printing platform 2 to the working position. The distance between the screen 3 and the prism sheet is set to 1.5 mm. The flat pressure plate 31 is pre-pressed to contact the screen 3, and the pressure is calibrated to 1.0 MPa. The ink formula is injected into the ink feeding box 4, and the ink is conveyed through the conveying channel... The ink flows from channel 12 to the dual-squeegee mechanism 4, with the flow rate controlled at 20 mL / s by a piezoelectric valve. The height of the corresponding screen 3 and substrate is fixed. A suitable pressure is applied by the flat pressure plate 31, which is the same size as the screen mesh, pressing vertically downwards. This causes the ink to precipitate through the gradient dots (50-200 μm aperture) of the screen 3, pressing the ink onto the substrate and avoiding height differences. After using the flat pressure plate 31, it is removed, and the dual-squeegee mechanism 4 is activated. The tilt angle of the dual-squeegee mechanism 4 is adjusted to 60° (relative to the plane of the screen 3). The gravitational force of the ink creates a self-flowing force, stabilizing the flow rate at 0.5-1 m / s, thus directly delivering the ink to the squeegee working area. The screen 3 is scraped twice by the dual-squeegee mechanism 4, eliminating the need for a return ink blade and thus preventing ink stagnation and solidification.

[0020] The pressure range of the flat pressure plate 31 is 0.5-2MPa, and its bottom surface is covered with an elastic silicone layer 311. The elastic silicone layer 311 can improve the pressing effect on the ink and prevent the ink from solidifying.

[0021] Secondly, the inclination angle of the conveying channel 12 is 30°-45°, and the inner wall is provided with an anti-coagulation coating 121. The setting of the conveying channel 12 makes it easier for ink to enter the double scraper mechanism 4 from the ink feeding box 4 through the conveying channel 12, so that the double scraper mechanism 4 can evenly coat the prism sheet with ink. The setting of the anti-coagulation coating 121 prevents the ink from coagulating and makes the ink flow more smoothly.

[0022] Meanwhile, the distance between the screen 3 and the printing platform 2 is fixed at 1-3mm, and the pattern of the screen 3 is designed with a gradient dot distribution for the prism light shadow area, so that the flat pressure plate 31 presses down vertically, and the ink is extracted through the gradient dots of the screen 3, which improves the ink extraction effect and quality, and improves the quality of subsequent ink coating.

[0023] In addition, the dual scraper mechanism 4 is synchronized, with the left scraper 41 and the right scraper 42 moving in opposite directions and at the same speed. The left scraper 41 and the right scraper 42 cooperate with each other to improve the coating effect when applying ink and avoid damage to the PITCH structure.

[0024] When using the prism sheet ink coating device of this embodiment, the ink formula is injected into the ink feeding box 4. The ink flows through the conveying channel 12 to the double doctor blade mechanism 4. The flow rate is controlled by the piezoelectric valve to be 20mL / s. The flat pressure plate 31 is pressed down vertically, causing the ink to be extruded through the gradient dots (aperture 50-200μm) of the screen 3, so that the ink is pressed onto the substrate, avoiding height difference. After using the flat pressure plate 31, it is removed, and the double doctor blade mechanism 4 is started. The tilt angle of the double doctor blade mechanism 4 is adjusted to 60° (relative to the plane where the screen 3 is located). The gravity component of the ink forms a self-flowing force, and the flow rate is stabilized at 0.5-1m / s, so that the ink can be directly delivered to the doctor blade working area. The screen 3 will be scraped twice by the double doctor blade mechanism 4, eliminating the ink return blade, thereby realizing the action of not needing ink return and avoiding ink stagnation and solidification.

[0025] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A prism sheet ink coating device, comprising a frame, a printing platform, and a screen, wherein two ink feeding boxes are symmetrically arranged on the top of the frame, and the bottom of each ink feeding box is connected to an inclined conveying channel; the printing platform is provided with a lifting mechanism for fixing the prism sheet substrate; a removable flat pressure plate is placed above the screen, the area of ​​the flat pressure plate being equal to the effective working area of ​​the screen; and a double scraper mechanism, including a left scraper and a right scraper, is correspondingly arranged at the outlet end of the conveying channel, both of which are connected to a pressure driving device.

2. The prism sheet ink coating device as described in claim 1, characterized in that: The pressure range of the planar pressure plate is 0.5-2MPa, and its bottom surface is covered with an elastic silicone layer.

3. The prism sheet ink coating device as described in claim 1, characterized in that: The conveying channel has an inclination angle of 30°-45° and an anti-solidification coating on its inner wall.

4. The prism sheet ink coating device as described in claim 1, characterized in that: The distance between the screen and the printing platform is fixed at 1-3mm, and the screen pattern is designed with a gradient dot distribution for the light and shadow area of ​​the prism.

5. The prism sheet ink coating device as described in claim 1, characterized in that: The dual scraper mechanism operates synchronously, with the left scraper and the right scraper moving in opposite directions and at the same speed.

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