Method for manufacturing a roughened surface of an alignment film printing plate

Abstract

The application discloses a kind of manufacturing methods of rough surface of alignment film printing plate, comprising the following steps: S1, preparation obtains smooth resin plate without rough surface;S2, the prepared smooth resin plate is pasted in the cylinder carrier surface of laser engraving machine, and the resin surface of smooth resin plate faces outward;S3, import TIF file point drawing, adjust the parameter of laser engraving machine;S4, start laser engraving machine and begin laser engraving rough surface;S5, clean and dry after engraving, the manufacturing method of the application is made by engraving mode, without stripping;The application can also increase laser engraving machine power or reduce speed to engrave high-depth rough surface, that is, the printing of high-membrane thickness product;In the application, rough surface structure type can be changed according to drawing change and equipment parameter adjustment, without re-opening mode, and the development cost is low, and the drawing time is short.

Description

Technical Field

[0001] This invention relates to the field of methods for fabricating rough surfaces of alignment film printing plates. More specifically, this invention relates to a method for fabricating rough surfaces of alignment film printing plates. Background Technology

[0002] Alignment film printing refers to printing on glass substrates using a PI printing machine, where ink (PI solution) is transferred to a flexible photosensitive resin plate via an anilox roller. It is a type of letterpress printing, also known as flexographic printing. In alignment film printing, the printing area of ​​the plate is raised. During printing, the anilox roller evenly coats the area to be printed with a certain thickness of ink (PI solution). Then, under the pressure of the impression roller, the ink (PI solution) layer of the area to be printed is transferred to the surface of the substrate, forming an alignment film. Currently, most manufacturers of alignment film printing plates use embossing and film exposure processes to create rough surfaces on their plates. The current in-house embossing process involves bonding photosensitive resin to an embossed film, followed by UV exposure, and finally separating the embossed film to obtain a printing plate with a rough surface. Currently, embossing and film exposure processes can produce Type 4 and Type 9 rough surfaces, which can meet the printing needs of the low-to-mid-end market. However, for high-film-thickness products, the printing results are still unsatisfactory. To meet the needs of high-end products, it is necessary to create new molds and develop new embossed films and rough surfaces. This involves high R&D costs, long production time, and high expenses. Furthermore, using high-depth embossed films can lead to difficulties in delamination after exposure. Summary of the Invention

[0003] To address the problems of existing technologies, such as low film thickness, inability to print high-end, high-film-thickness products, limited film surface types, high development costs and time for new molds, and difficulties in removing the film after exposure (due to the large contact area between the film and resin) when creating high-depth embossing plates, a preferred embodiment of the present invention provides a method for manufacturing a rough surface of an alignment film printing plate, comprising the following steps: S1. Prepare a smooth resin plate without rough surfaces; S2. Place the prepared smooth resin plate onto the surface of the roller carrier of the laser engraving machine, with the resin side of the smooth resin plate facing outwards. S3. Import the raised dot drawing into the laser engraving machine's software and adjust the laser engraving machine's parameters; S4. Start the laser engraving machine to begin laser engraving the rough surface; S5. Clean and dry after carving.

[0004] According to a preferred embodiment of the present invention, PET is laid on the exposure platform of the exposure machine, and then resin is coated and exposed to obtain a smooth resin plate without roughness.

[0005] According to a preferred embodiment of the present invention, in step S3, the parameters of the laser engraving machine are: EPR=10; ES=700; POWER=60; where POWER=60 means that the power of the laser engraving machine is 60W; ES=700 means that the distance the drum rotates per second is 700cm; EPR=10 means that the laser head advances 10µm for each rotation of the drum.

[0006] According to a preferred embodiment of the present invention, the laser engraving machine is a cylindrical straight-beam CO2 laser.

[0007] According to a preferred embodiment of the present invention, the roller has a size of φ1200*L3180mm, a maximum power of 400W, and a spot diameter of 5μm.

[0008] The present invention has at least the following beneficial effects: the manufacturing method of the present invention uses engraving to make the plate, without the need for demolding; the present invention can also increase the power of the laser engraving machine or reduce the speed to engrave a high-depth rough surface, which can be used to print products with high film thickness; in the present invention, the rough surface structure type can be changed according to the changes in the drawings and the equipment parameters, without the need to re-make the mold, resulting in low R&D costs and short drawing time.

[0009] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0010] Figure 1 This is a schematic diagram illustrating the steps of the method for fabricating the rough surface of the alignment film printing plate in this invention.

[0011] Figure 2 This is a diagram showing the equipment layout during the fabrication process of the rough surface of the alignment film printing plate of the present invention.

[0012] Figure 3 This is a TIFF file format embossed drawing used in this invention.

[0013] Figure 4 This is a 3D topographic image of the rough surface of the alignment film printing plate in this invention.

[0014] Figure 5 The diagram shows the measurement process for measuring the roughness of the alignment film printing plate prepared according to this invention using optical instruments.

[0015] Figure 6 The SEM printing thickness of the rough surface of the alignment film printing plate prepared in this invention is shown. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0017] The following description is intended to disclose the present invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious modifications will occur to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0018] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0019] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0020] like Figure 1-6 As shown, a preferred embodiment of the present invention provides a method for fabricating a rough surface of an alignment film printing plate, comprising the following steps: S1. Prepare a smooth resin plate 1 without rough surfaces; Specifically, PET is laid on the exposure platform of the exposure machine, and then resin is applied and exposed to obtain a smooth resin plate without roughness.

[0021] S2. The prepared smooth resin plate is attached to the surface of the roller carrier 2 of the laser engraving machine, with the resin surface of the smooth resin plate 1 facing outwards. This ensures that the laser engraves the resin surface of the smooth resin plate 1. S3. Import the raised dot drawing (TIFF file format) into the laser engraving machine's software and adjust the laser engraving machine's parameters; The TIF file's bump pattern is composed of black and white pixels, with black pixels not engraved and white pixels engraved. The pattern resolution is 6350, and the pattern layout consists of φ32 circles with a horizontal spacing of 16um and a vertical spacing of 0, arranged in an alternating pattern.

[0022] S4. Start the laser engraving machine to engrave the rough surface, where the laser output port 3 of the laser engraving machine emits laser light; S5. Clean and dry after carving.

[0023] The manufacturing method of this invention uses engraving to create the plate, eliminating the need for demolding. This invention can also increase the power of the laser engraving machine or reduce the speed to engrave a high-depth rough surface, thus enabling printing of products with high film thickness. In this invention, the type of rough surface structure can be changed according to changes in drawings and equipment parameters, eliminating the need for re-molding, resulting in low R&D costs and short drawing time.

[0024] According to a preferred embodiment of the present invention, in step S3, the parameters of the laser engraving machine are: EPR=10; ES=700; POWER=60; where POWER=60 means that the power of the laser engraving machine is 60W; ES=700 means that the distance the drum rotates per second is 700cm; EPR=10 means that the laser head advances 10µm for each rotation of the drum.

[0025] Among them, EPR=10, that is, the laser head advances 10um for one revolution of the roller. The smaller the EPR value, the finer the engraving. ES=700 (that is, the distance the roller rotates per second is 700cm. The larger the ES, the faster the processing speed and the shallower the engraving depth). POWER=60 (that is, the power of the laser engraving machine is 60W. The higher the power, the deeper the engraving). After adjustment, the engraving begins. According to the production method and equipment parameters, a circular boss rough surface with a height of 13~15um can be processed. The printing film thickness can reach 1000~1100 angstroms. The number of lines and the aperture ratio of the plate can be adjusted through the drawing layout.

[0026] During laser engraving, the power of the laser engraving machine can be increased or the rotation speed can be reduced to engrave a high-depth rough surface, which can be used for printing products with high film thickness. The rough surface structure type can be adjusted and changed according to changes in drawings and equipment parameters, without the need to re-make molds, resulting in low R&D costs and short drawing time. According to a preferred embodiment of the present invention, the laser engraving machine is a cylindrical straight-beam CO2 laser with a cylinder size of φ1200*L3180mm, a maximum power of 400W, and a spot diameter of 5μm.

[0027] in, Figure 4 This is a 3D topographic image of the rough surface of the alignment film printing plate in this invention. Orange represents the apex of the boss, and the dots below represent the low points. The red box shows the distance scale of the height difference, indicating that the boss height is about 12um.

[0028] Currently, mass-produced resin plates (made using embossing technology) weigh approximately 900-1000 angstroms. Figure 5 The diagram shows the measurement process of the alignment film printing plate prepared by the present invention for optical instruments. It can be seen from the blank that the film thickness after printing by the present invention can reach 1100 angstroms, which is better than the current mass-produced film thickness. Figure 6 The thickness of the printed film was measured using a scanning electron microscope (SEM), and repeated verification confirmed that the film thickness had indeed been significantly improved.

[0029] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A method for manufacturing a rough surface of an alignment film printing plate, characterized in that, Includes the following steps: S1. Prepare a smooth resin plate without rough surfaces; S2. Place the prepared smooth resin plate onto the surface of the roller carrier of the laser engraving machine, with the resin side of the smooth resin plate facing outwards. S3. Import the raised dot drawing into the laser engraving machine's software and adjust the laser engraving machine's parameters; S4. Start the laser engraving machine to begin laser engraving the rough surface; S5. Clean and dry after carving; The embossed pattern is a TIF file, which is composed of black and white pixels. Black pixels are not embossed, while white pixels are embossed. The pattern resolution is 6350. The pattern layout is a φ32 circle with a horizontal spacing of 16um and a vertical spacing of 0, arranged in an alternating pattern. In S3, the parameters of the laser engraving machine are: EPR=10; ES=700; POWER=60; where POWER=60 means the laser engraving machine power is 60W; ES=700 means the distance the drum rotates per second is 700cm; EPR=10 means the laser head advances 10µm for each rotation of the drum.

2. The method for fabricating the rough surface of the alignment film printing plate according to claim 1, characterized in that, By laying PET on the exposure platform of the exposure machine, coating it with resin, and then exposing it, a smooth resin plate without roughness can be obtained.

3. The method for fabricating the rough surface of the alignment film printing plate according to claim 1, characterized in that, The laser engraving machine is a cylindrical straight-beam CO2 laser.

4. The method for fabricating the rough surface of the alignment film printing plate according to claim 3, characterized in that, Its roller dimensions are φ1200*L3180mm, its maximum power is 400W, and its spot diameter is 5μm.

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