Projection screen manufacturing method

Abstract

The manufacturing method of the projection screen comprises the following steps: S100, cutting and rolling: cutting a base film into base film strips with the width of 3-15mm, and rolling; s200, strip pasting is conducted, specifically, a base material is selected, the positions of a plurality of base film strips are sequentially set on the base material with one direction of the base material as the benchmark, and a spacing distance exists between every two adjacent base film strips; the surface of the base material is coated with glue, a plurality of base film strips are attached, and the extension directions of the base film strips are consistent; the base material is bent along gaps between the adjacent base film strips to form a plurality of base material strips, and the base material strips are arranged close to a flat plate tool mold, adsorbed to the flat plate tool mold and rolled; meanwhile, a diaphragm with an imaging display function is tiled; and roller coating and gluing are conducted, the membrane and the base material are attached in an aligned mode, flat pressing and curing are conducted, and the projection screen is formed. According to the invention, the flatness of the imaging surface of the projection screen is ensured while the production stability is ensured.

Description

Technical Field

[0001] This invention belongs to the field of projection display technology, and specifically relates to a method for manufacturing a projection screen. Background Technology

[0002] Patent application number 202411021233.X, entitled "A Method for Manufacturing a Rollable Support Structure and a Projection Screen," discloses a method for manufacturing a support structure and a projection screen. The method involves wrapping a flexible sheet around the surface of a cylindrical roller, using a laser or cutting tool to carve spaced grooves into the flexible sheet, removing the sheet from the roller, and bending it alternately in both directions to form the support structure. A film with imaging display function is then bonded to the support structure to create the projection screen. While the entire process appears efficient and allows for continuous production, ensuring the flatness of the resulting projection screen's imaging surface is difficult. Summary of the Invention

[0003] This application provides a method for manufacturing a projection screen, the purpose of which is to ensure production stability while ensuring the flatness of the projection screen's imaging surface.

[0004] This application is achieved through the following technical solution:

[0005] A method for manufacturing a projection screen includes the following steps:

[0006] S100, Cutting and Rolling: Cut the base film into strips with a width of 3-15mm and roll them up;

[0007] S200, Adhesive Strips: Select a substrate, and using one direction of the substrate as a reference, sequentially set the positions of several base film strips on the substrate, with an interval between adjacent base film strips; apply adhesive to the surface of the substrate, and adhere several base film strips, with the extension directions of the base film strips being consistent;

[0008] S300, Adhesive molding: The substrate is bent along the gap between adjacent base film strips to form several substrate strips. The substrate strips are arranged close to the flat panel tooling mold and adsorbed onto the flat panel tooling mold, and then rolled. At the same time, the film with imaging display function is laid flat. Adhesive is applied by roller, and the film is aligned and bonded to the substrate. It is then pressed flat and cured to form a projection screen.

[0009] In this application, the base film is first cut into strips and rolled up for later use. Then, a substrate is selected, and the reference direction, position of the base film strips, and spacing between adjacent strips are determined. Adhesive is then applied to the surface of the substrate to bond the base film strips, fixing their positional relationship to the substrate. This facilitates subsequent bending of the substrate along the gaps between adjacent strips to form several substrate strips, which are then arranged and adsorbed onto a flat panel tooling mold to form a stable support structure. Finally, these strips are aligned and bonded to the film to form a complete projection screen.

[0010] In this application, adjacent base film strips are spaced apart. This creates weak points and positioning areas after the substrate and base film strips are bonded together, facilitating subsequent bending of the substrate and shaping of the support structure at these locations. Compared to the prior art method of carving spaced grooves into the substrate to create weak points, this simplifies the processing conditions and makes the process more stable. By bending the substrate along the gaps between adjacent base film strips to form several substrate strips, which are then arranged and adsorbed onto a flat panel tooling mold to form the film's support structure, the stability of the processing is ensured, thereby guaranteeing the stability of the projection screen. The support structure formed by the flat panel tooling mold, after being bonded to the film, provides stable support for the film, ensuring the flatness of the projection screen's imaging display surface.

[0011] Furthermore, step S200 includes:

[0012] The interval between adjacent base film strips is set as the stroke, the stroke is determined, and the two rolls of base film strips are unwound to the corresponding positions on the surface of the substrate.

[0013] In this application, the spacing between adjacent base film strips is set, and the base film strips are rolled up in pairs on the surface of the substrate and pasted at the corresponding positions, which helps to improve the bonding efficiency between the substrate and the base film strips.

[0014] Further, taking the base film strip set at the outermost edge of the substrate as the first base film strip, and sequentially as the second base film strip, the third base film strip, ..., the 2nth base film strip, then the interval between the first base film strip and the second base film strip is the first stroke, the interval between the second base film strip and the third base film strip is the second stroke, ..., the interval between the 2n-1th base film strip and the 2nth base film strip is the 2n-1th stroke, and the relationship between each stroke is as follows:

[0015] Several of the aforementioned travel intervals are equal;

[0016] The first stroke is 3 to 5 times the second stroke, or the second stroke is 3 to 5 times the first stroke.

[0017] In this application, determining the reference points, the spacing relationship between the base film strips, and the changing trend of the spacing between each base film strip is beneficial to improving the strength of the support structure formed by the base film strips and the substrate, thereby improving the flatness of the imaging surface of the projection screen after molding.

[0018] Furthermore, the base film is formed of black or translucent PET material, and the thickness of the base film is 10 to 50 micrometers.

[0019] In this application, the base film is formed of black or semi-transparent PET material, which helps control the manufacturing cost of the projection screen. Controlling the thickness of the base film to 10–50 micrometers facilitates cutting and subsequent lamination.

[0020] Furthermore, the thickness of the substrate is 25 to 250 micrometers.

[0021] In this application, the thickness of the substrate is controlled to be 25 to 250 micrometers to facilitate bonding with the base film and subsequent bending, and to be placed and adsorbed on the flat tooling mold.

[0022] Furthermore, a first adhesive is provided between the base film strip and the substrate to connect the base film strip and the substrate.

[0023] Furthermore, the first adhesive is a UV adhesive with a coating thickness of 10–40 micrometers.

[0024] In this application, a UV adhesive is used as the first bonding agent to facilitate cost control of the entire manufacturing process. The adhesive coating thickness is controlled between 10 and 40 micrometers to provide stable adhesion between the substrate and the base film strip.

[0025] Furthermore, the flat tooling mold mentioned in step S300 is a flat mold with several serrated sides, and the serrated sides have suction grooves.

[0026] In this application, the flat panel tooling mold is configured as a flat panel mold with several serrated sides. Several substrate strips are arranged close to the serrated sides of the flat panel mold, forming a support structure with a serrated structure formed by the bonding and bending of substrate and base film strips, resulting in high stability. Suction grooves are provided on the serrated sides to facilitate the flat panel tooling mold to provide adsorption force to the substrate, thereby ensuring the stability of the manufacturing process.

[0027] Furthermore, the side of the membrane connected to the substrate is the side of the substrate closer to the base film strip.

[0028] In this application, the side where the diaphragm is connected to the substrate is set to the side of the substrate closer to the base film strip. In this way, the direction of the substrate bending is away from the base film strip. The substrate strip is arranged for adsorption close to the flat tooling mold, and the base film strip is located in the middle of the diaphragm and the substrate. A certain space is reserved between adjacent base film strips to facilitate roller coating of adhesive and to determine the position for alignment and bonding.

[0029] Furthermore, in step S300, a second adhesive is used for roller coating, and the viscosity of the second adhesive is 10,000 to 30,000 cps.

[0030] In this application, the second adhesive with a viscosity of 10,000 to 30,000 cps is used in step S300 for roller coating to ensure the adhesion between the film and the substrate and form a stable projection screen. Attached Figure Description

[0031] Figure 1 These are simplified diagrams of the steps in an embodiment of this application.

[0032] Figure 2 for Figure 1 Disassembly diagram of step S100;

[0033] Figure 3 for Figure 1 Disassembly diagram of step S200;

[0034] Figure 4 for Figure 1 Disassembly diagram of step S300;

[0035] Figure 5 This is a schematic diagram showing that the base film strips are arranged in pairs on the surface of the substrate in an embodiment of this application;

[0036] Figure 6 This is a schematic diagram showing several base film strips disposed on the surface of a substrate in an embodiment of this application;

[0037] Figure 7 This is a schematic diagram of a flat tooling mold in an embodiment of this application;

[0038] Figure 8 This is a schematic diagram of the substrate being attached to the surface of a flat tooling mold in this application.

[0039] Figure 9 This is a schematic diagram of the alignment and bonding of the diaphragm and the substrate in this application.

[0040] Explanation of reference numerals in the attached drawings: 1000 - base film strip; 2000 - first adhesive; 3000 - substrate; 4000 - flat tooling mold; 5000 - second adhesive; 6000 - film sheet. Detailed Implementation

[0041] 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, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0043] See Figures 1-9 A method for manufacturing a projection screen includes the following steps:

[0044] S100, Cutting and Rolling: Cut the base film into strips 1000 with a width of 3-15mm, and roll them up;

[0045] S200, Adhesive Strips: Select a substrate 3000, and using one direction of the substrate 3000 as a reference, sequentially set the positions of several base film strips 1000 on the substrate 3000, with a gap between adjacent base film strips 1000; apply adhesive to the surface of the substrate 3000 and adhere several base film strips 1000, with the extension direction of the base film strips 1000 being consistent.

[0046] S300, Adhesive Molding: The substrate 3000 is bent along the gap between adjacent base film strips 1000 to form several substrate strips. The substrate strips are arranged close to the flat panel tooling mold 4000 and adsorbed onto the flat panel tooling mold 4000 and rolled. At the same time, the film 6000 with imaging display function is laid flat. Adhesive is applied by roller, and the film 6000 is aligned and bonded to the substrate 3000. It is then flat-pressed and cured to form a projection screen.

[0047] In the embodiments of this application, the base film is first cut into base film strips 1000 and rolled up for later use. Then, a substrate 3000 is selected, and the reference direction, position of the base film strips 1000, and spacing between adjacent base film strips 1000 are determined. The base film strips 1000 are then bonded to the surface of the substrate 3000 with adhesive, fixing the positional relationship between the base film strips 1000 and the substrate 3000. This facilitates the subsequent bending of the substrate 3000 along the gaps between adjacent base film strips 1000 to form several substrate strips, which are then arranged and adsorbed onto the flat panel tooling mold 4000 to form a stable support structure. Finally, these strips are aligned and bonded to the membrane sheet 6000 to form a complete projection screen.

[0048] In the embodiments of this application, adjacent base film strips 1000 are spaced apart. This creates weak points and positioning positions after the substrate 3000 and the base film strips 1000 are bonded together. This facilitates subsequent bending of the substrate 3000 at these positions and the shaping of the support structure formed by the base film strips 1000 and the substrate 3000. Compared to the prior art method of carving spaced grooves into the substrate 3000 to create weak points, this simplifies the processing conditions and makes the process more stable. By bending the substrate 3000 along the gaps between adjacent base film strips 1000 to form several base film strips, which are then arranged and adsorbed onto the flat panel tooling mold 4000 to form the support structure for the membrane 6000. After bonding with the membrane 6000, this provides stable support for the membrane 6000, ensuring the flatness of the projection screen's imaging display surface.

[0049] Steps S100 to S300 are further described.

[0050] Step S100 includes:

[0051] S110, Feeding: Select the base film, check that the surface of the base film is free from contamination and scratches, and transfer the base film to the slitting and rolling equipment;

[0052] S120, Cutting and Rolling: The cutting and rolling equipment cuts the base film, adjusts the position of the base film in real time, and cuts the base film into several base film strips with a width of 3 to 15 mm 1000;

[0053] S130, Unloading: Remove the cut base film strips 1000 from the slitting and rolling equipment, and roll them up for later use.

[0054] In the embodiments of this application, the base film is cut into several base film strips with a width of 3 to 15 mm. The base film strip 1000 is prepared for subsequent bonding of the base film strip 1000 and the substrate 3000. This avoids the base film strip 1000 being too narrow, which would result in too much bending area for the substrate 3000 and make folding the substrate 3000 too difficult. It also avoids the base film strip 1000 being too wide, which would result in too little bending area for the substrate 3000, and the support structure formed together with the base film strip 1000 after folding would have insufficient support and stability.

[0055] Step S200 includes:

[0056] S210, Feeding: Select substrate 3000, check the cleanliness of the surface of substrate 3000, and prepare substrate 3000 and the slit base film strip 1000;

[0057] S220, Double Unwinding: Adopts a double unwinding system, unwinding 3000 substrate and 1000 base film strip;

[0058] S230, Slot positioning: Taking one direction of the substrate 3000 as a reference, the positions of several base film strips 1000 are sequentially set on the substrate 3000. The interval between adjacent base film strips 1000 can be set as the stroke. After determining the stroke, the two rolls of base film strips 1000 are unwound to the corresponding positions on the surface of the substrate 3000.

[0059] S240, Adhesive Coating: Prepare the adhesive and apply it to the 3000 substrate surface;

[0060] S250, Lamination: Several base film strips 1000 are sequentially laminated at positions set on the surface of the substrate 3000, with the extension direction of each base film strip 1000 being consistent.

[0061] S260, Curing: The substrate 3000 with the base film strip 1000 is cured by a mercury lamp;

[0062] S270, winding: winding up the cured substrate 3000;

[0063] S280. Cutting: Cut the substrate 3000 into sections according to the size of the projection screen. For example, the substrate 3000 with the base film strip 1000 attached can be cut into 1.3-2m sections.

[0064] In the embodiments of this application, the spacing between adjacent base film strips 1000 is set, and the base film strips 1000 are rolled up in pairs on the surface of the substrate 3000 and pasted at the corresponding positions, which helps to improve the bonding efficiency between the substrate 3000 and the base film strips 1000.

[0065] Step S300 includes:

[0066] S310, substrate strip bending and adsorption: The substrate 3000 with the base film strip 1000 pasted on it, which was made in step S200, is bent along the gap between adjacent base film strips 1000 to form several substrate strips. The bent substrate strips are arranged close to the flat tooling mold 4000 and adsorbed on the flat tooling mold 4000.

[0067] S320, Roll forming: Roll forming the adsorbed substrate strip;

[0068] S311. Membrane laying: Clean the membrane 6000 with the display function, remove surface contaminants, and then lay it flat;

[0069] S321. Roller coating: Apply adhesive to the bent parts of the rolled substrate strip, with the width of the adhesive covering 1-2mm on both sides of the crease.

[0070] S330, Alignment and Bonding: Use pressure rollers to align and bond the non-imaging display surface of the diaphragm 6000 with the substrate 3000, eliminating air bubbles;

[0071] S340, Flat Press Curing: Flat press the aligned and bonded 6000 film and cure it with a mercury lamp;

[0072] S350, Unmolding: Demold the bonded and cured film 6000 and substrate 3000. Use a non-metallic scraper to assist in the peeling process to avoid scratching the film and form a projection screen.

[0073] In the embodiments of this application, the base film strip 1000 set at the outermost edge of the substrate 3000 is the first base film strip, followed by the second base film strip, the third base film strip, ... the 2nth base film strip. The interval between the first base film strip and the second base film strip is the first stroke, the interval between the second base film strip and the third base film strip is the second stroke, ..., and the interval between the 2n-1th base film strip and the 2nth base film strip is the 2n-1th stroke. The relationship between each stroke can be: several strokes are equally spaced; the first stroke is 3 to 5 times the second stroke, or the second stroke is 3 to 5 times the first stroke.

[0074] In the embodiments of this application, the reference points, the spacing relationship between the base film strips 1000, and the changing trend of the spacing between each base film strip 1000 are determined first. This is beneficial to improve the strength of the support structure formed by the base film strips 1000 and the substrate 3000, thereby improving the flatness of the imaging surface of the projection screen after molding.

[0075] In the embodiments of this application, several stroke intervals are set to be equal, that is, the first stroke, the second stroke, the third stroke... the (2n-1)th stroke interval is equal, which simplifies the entire manufacturing process. Based on this, the first stroke is set to be 3 to 5 times the second stroke, or the second stroke is set to be 3 to 5 times the first stroke, which facilitates the subsequent folding of the substrate 3000.

[0076] Specifically, in the embodiments of this application, see... Figure 6 The first stroke, the second stroke, the third stroke... the 2n-1th stroke can be set up to present a cyclical change trend of 0.5mm, 0.15mm, 0.5mm, 0.15mm, 0.5mm, 0.15mm, 0.5mm, 0.15mm... This regular change simplifies the manufacturing process and facilitates the subsequent folding of the 3000 substrate.

[0077] In the embodiments of this application, the base film can be a thin film or a sheet, and the material can be any one of polyethylene, polypropylene, polystyrene, polyvinyl chloride, cast polypropylene, biaxially oriented polypropylene film, polycarbonate, polyethylene terephthalate, polyamide, polyurethane, polymethyl methacrylate, polycarbonate, thermoplastic polyurethane elastomer rubber, or acrylic, or any combination of two or more of polyethylene, polypropylene, polystyrene, polyvinyl chloride, cast polypropylene, biaxially oriented polypropylene film, polycarbonate, polyethylene terephthalate, polyamide, polyurethane, polymethyl methacrylate, polycarbonate, thermoplastic polyurethane elastomer rubber, or acrylic. This is beneficial for the selection of base film materials and cost control.

[0078] In the embodiments of this application, the base film can be directly formed from black or translucent PET material, which helps control the manufacturing cost of the projection screen. Controlling the thickness of the base film to 10–50 micrometers facilitates cutting and subsequent lamination.

[0079] In the embodiments of this application, the material of the substrate 3000 can be the same as that of the base film, but the thickness requirements are slightly different. For example, the thickness of the substrate 3000 can be set to 25-250 micrometers, which facilitates the bonding of the substrate 3000 and the base film strip 1000, as well as the subsequent bending, laying, and adsorption onto the flat tooling mold 4000, thus avoiding damage to the substrate 3000.

[0080] In the embodiments of this application, see Figure 5 The base film strips 1000 can be bonded together in pairs with the substrate 3000. Here, a first adhesive 2000 is provided between the base film strips 1000 and the substrate 3000 to connect the base film strips 1000 and the substrate 3000.

[0081] In the embodiments of this application, the first adhesive 2000 can be a UV adhesive, which facilitates control over the cost of the entire manufacturing process. The adhesive thickness can also be controlled to be 10–40 micrometers, meaning the thickness of the first adhesive 2000 is 10–40 micrometers, providing sufficient and stable adhesion for the bonding of the substrate 3000 and the base film strip 1000.

[0082] In the embodiments of this application, the first adhesive 2000 between the substrate 3000 and the base film strip 1000 is selected to be an adhesive with a viscosity of 100 to 800 cps and a shrinkage rate of 2% to 5%.

[0083] As further explanation, the substrate 3000 can be a PET material with a thickness of 25 micrometers, the base film can be a PET material with a thickness of 250 micrometers, and the first adhesive 2000 can be a UV adhesive with a thickness of 10 micrometers. By setting the thickness of the substrate 3000, the base film strip 1000 and the first adhesive 2000, the adhesion between the substrate 3000 and the base film strip 1000 can be effectively controlled, and the situation where the adhesive is applied too thickly, resulting in the substrate 3000 and the base film strip 1000 being too thick after being bonded together, making it inconvenient to bend, can also be avoided.

[0084] In the embodiments of this application, see Figure 7 In step S300, the flat tooling mold 4000 is a flat mold with several serrated sides. The aforementioned substrate strips are bent along the gaps between adjacent base film strips 1000 to form several base material strips, which are arranged near the serrated sides of the flat tooling mold 4000 to form a support structure with serrated structure formed by the substrate 3000 and the base film strips 1000 being bonded and bent together. This structure has high stability.

[0085] As a further explanation, suction grooves (not shown in the figure) can also be provided on the serrated side of the flat tooling mold 4000. This allows the flat tooling mold 4000 to provide adsorption force to the substrate 3000, thereby ensuring the stability of the manufacturing process.

[0086] As a further explanation, the substrate 3000, prepared in step S200 and with the base film strips 1000 adhered to it, is bent along the gaps between adjacent base film strips 1000 to form several substrate strips. Here, the bending direction of the substrate 3000 is towards the substrate 3000. Specifically, when the substrate 3000 is bent along the gaps between adjacent base film strips 1000, the bending direction is away from the base film strips 1000 and towards the substrate 3000. This allows for the reservation of a certain space between adjacent base film strips 1000 for roller coating of adhesive.

[0087] In the embodiments of this application, the side of the diaphragm 6000 that connects to the substrate 3000 is the side of the substrate 3000 closest to the base film strip 1000. This allows for direct application of adhesive within the pre-reserved space between adjacent base film strips 1000, determining the alignment and bonding position, making the entire process relatively simple.

[0088] In the embodiments of this application, see Figure 9 In step S300, the second adhesive 5000 is applied by roller to bond the diaphragm 6000 and the substrate 3000 together.

[0089] In the embodiments of this application, the second adhesive 5000 can be a UV adhesive, which facilitates cost control of the entire process. Although both the first adhesive 2000 and the second adhesive 5000 can be UV adhesives, the requirements for the second adhesive 5000 are higher than those for the first adhesive 2000. For example, the viscosity of the second adhesive 5000 is 10,000 to 30,000 cps, and the shrinkage rate is controlled within 2%. This more effectively ensures the adhesion between the film 6000 and the substrate 3000, forming a stable projection screen.

[0090] As a further explanation, when the viscosity of the second adhesive 5000 is sufficient, the amount of the second adhesive 5000 used can be effectively reduced. Under the same thickness, it provides stronger adhesion for the bonding of the film 6000 and the substrate 3000, ensuring the stability of the bonding and thus ensuring the stability of the projection screen.

[0091] The method described in this application can be used to manufacture short-throw or medium-to-long-throw projection screens. The requirements for the imaging display film vary depending on the actual needs. The method can also be used to manufacture flexible or rigid screens, allowing for the selection of different substrates, base films, and films to meet specific requirements.

[0092] Those skilled in the art will recognize that the embodiments described herein are intended to help the reader understand the principles of the invention, and should be understood that the scope of protection of the invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations based on the technical teachings disclosed in this invention without departing from the spirit of the invention, and these modifications and combinations are still within the scope of protection of this invention.

Claims

1. A method of making a projection screen, characterized by, The method comprises the following steps: S100, cutting and dividing: cutting the base film into base film strips with a width of 3-15 mm and dividing them; S200, strip pasting: selecting a base material, setting positions of a plurality of base film strips on the base material in one direction of the base material, and leaving a spacing distance between adjacent base film strips; coating adhesive on the surface of the base material and pasting the plurality of base film strips, the extension directions of the base film strips being consistent; S300, adhesive bonding: bending the base material along the gap between adjacent base film strips to form a plurality of base material strips, arranging the plurality of base material strips close to a flat tooling mold and adsorbing them on the flat tooling mold, and rolling; meanwhile, laying a film with imaging display function; coating adhesive by rolling, aligning and pasting the film and the base material, and pressing and curing to form a projection screen.

2. The production method according to claim 1, characterized by, Step S200 comprises: setting the spacing distance between adjacent base film strips as a stroke, determining the stroke, and unwinding two rolls of base film strips to the corresponding positions on the surface of the base material.

3. The method of manufacturing according to claim 2, wherein, The base film strip set at the edge of the base material is the first base film strip, followed by the second base film strip, the third base film strip,..., and the 2n base film strip. The spacing distance between the first base film strip and the second base film strip is the first stroke, the spacing distance between the second base film strip and the third base film strip is the second stroke,..., the spacing distance between the 2n-1 base film strip and the 2n base film strip is the 2n-1 stroke, and the relationship between the strokes is as follows: The spacing distances of the strokes are equal; The first stroke is 3-5 times the second stroke, or the second stroke is 3-5 times the first stroke.

4. The method of making of claim 1, wherein, The base film is formed of black or semi-transparent PET material, and the thickness of the base film is 10-50 microns.

5. The method of manufacturing according to claim 4, wherein, The thickness of the base material is 25-250 microns.

6. The method of any of claims 1-5, wherein A first adhesive is provided between the base film strip and the base material for connecting the base film strip and the base material.

7. The method of manufacturing according to claim 6, wherein, The first adhesive is UV adhesive, and the coating thickness is 10-40 microns.

8. The method of making of claim 1, wherein, The flat tooling mold in step S300 is a flat mold with a plurality of sawtooth-shaped sides, and the sawtooth-shaped sides have suction grooves.

9. The method of making of claim 1, wherein, The side of the film connected to the base material is the side of the base material close to the base film strip.

10. The production method according to claim 8 or 9, characterized by, The second adhesive is used for rolling in step S300, and the viscosity of the second adhesive is 10,000-30,000 cps.

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