Membrane manufacturing method, cover plate manufacturing method, cover plate and electronic equipment

Abstract

The invention discloses a manufacturing method of a diaphragm, a manufacturing method of a cover plate, the cover plate and electronic equipment. The manufacturing method of the diaphragm comprises the following steps: arranging release films on two opposite sides of a to-be-reduced diaphragm to form a composite film; the two opposite sides of the composite film are subjected to hot pressing, the heated composite film is drawn and stretched to be thinned, and the value range of the difference delta T between the hot pressing temperature T and the glass transition temperature Tg of the film to be thinned is 15 DEG C, 25 DEG C; and removing the release film to obtain the target diaphragm. The glass transition temperature of the release film is generally higher than the glass transition temperature of the sheet material to be reduced, so that in the process of heating the composite film and pulling and stretching the composite film by the pulling assembly, the sheet material to be reduced is stretched, deformed and thinned, the thickness of the release film does not change, and the release film and the heating device do not adhere to each other; the manufacturing efficiency of the diaphragm can be improved.

Description

Technical Field

[0001] The present application relates to the field of cover plate manufacturing, and more specifically, to a method for manufacturing a diaphragm, a method for manufacturing a cover plate, a cover plate, and an electronic device. Background Art

[0002] Glass Deco Film (GDF) is one of the common manufacturing processes for electronic device cover plates. During the manufacturing process of the cover plate, the thickness of the film will affect the optical effect of the cover plate, and the glare effect of the manufactured cover plate is not good. In addition, the film that is too thick has a higher hardness and is more difficult to bend, making it difficult to continuously produce, process and cut the film, which affects the manufacturing efficiency of the cover plate. Summary of the invention

[0003] Embodiments of the present application provide a method for manufacturing a membrane, a method for manufacturing a cover plate, a cover plate, and an electronic device.

[0004] The method for manufacturing a diaphragm according to an embodiment of the present application includes: setting a release film on opposite sides of a sheet to be thinned to form a composite film; hot pressing the opposite sides of the composite film, and pulling and stretching the heated composite film to thin the composite film, wherein the difference δT between the hot pressing temperature T and the glass transition temperature Tg of the sheet to be thinned is in the range of [15°C, 25°C]; and removing the release film to obtain the target diaphragm.

[0005] The method for making a cover plate of the embodiment of the present application includes: making a target film; transferring shadowless adhesive on opposite sides of the film, respectively, and the shadowless adhesive surface of at least one side of the film has a texture; making an optical coating on the side of the film where the texture is formed to form a coating with a texture; and fixing the coating on a substrate to form a cover plate. The making of the target film includes: setting a release film on opposite sides of the sheet to be thinned to form a composite film; using two heating rollers to heat press the opposite sides of the composite film, and using a traction assembly to traction and stretch the heated composite film to thin the composite film, wherein the difference δT between the temperature T of the heating roller and the glass transition temperature Tg of the sheet to be thinned has a value range of [15°C, 25°C]; and removing the release film to obtain the target film.

[0006] The cover plate of the embodiment of the present application includes a substrate and a coating, the coating has a texture, the coating is arranged on one side of the substrate, and the coating includes a film sheet, a shadowless adhesive layer and an optical coating. The method for making the film sheet includes: setting a release film on opposite sides of the film sheet to be reduced to form a composite film; hot pressing the opposite sides of the composite film, and pulling and stretching the heated composite film to thin the composite film, wherein the difference δT between the temperature T of the heating roller and the glass transition temperature Tg of the film sheet to be reduced is in the range of [15°C, 25°C]; and removing the release film to obtain the target film sheet. The shadowless adhesive layers are respectively arranged on opposite sides of the film sheet, and at least one side of the shadowless adhesive layer has the texture. The optical coating is arranged on the side of the shadowless adhesive layer with the texture away from the film sheet, and the optical coating is used to change the optical effect formed by the coating.

[0007] The electronic device of the embodiment of the present application includes a body and a cover plate. The cover plate includes a substrate and a coating, the coating has a texture, the coating is arranged on one side of the substrate, the coating includes a diaphragm, a shadowless adhesive layer and an optical coating, the shadowless adhesive layer is respectively arranged on two opposite sides of the diaphragm, at least one side of the shadowless adhesive layer has the texture, the optical coating is arranged on the side of the shadowless adhesive layer with the texture away from the diaphragm, and the optical coating is used to change the optical effect formed by the coating. The cover plate is mounted on the body.

[0008] In the diaphragm manufacturing method, cover plate manufacturing method, cover plate and electronic device of the present application, the glass transition temperature of the release film is generally higher than the glass transition temperature of the film sheet to be reduced. Therefore, in the process of heating the composite film and pulling and stretching the composite film by the traction component, the film sheet to be reduced will be stretched, deformed and thinned, while the thickness of the release film will not change, and there will be no adhesion between the release film and the heating device, which can improve the manufacturing efficiency of the diaphragm and further improve the manufacturing efficiency of the cover plate.

[0009] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0011] Figure 1 is a flow chart of a method for making a membrane according to certain embodiments of the present application;

[0012] Figure 2 It is a schematic diagram of the principle of the manufacturing process of the membrane in some embodiments of the present application;

[0013] Figure 3 It is a schematic diagram of the principle of the manufacturing process of the membrane in some embodiments of the present application;

[0014] Figure 4 is a schematic diagram of the planar structure of a thinning device according to some embodiments of the present application;

[0015] Figures 5 to 10 is a flow chart of a method for making a membrane according to certain embodiments of the present application;

[0016] Fig.11 is a perspective exploded schematic diagram of a cover plate of certain embodiments of the present application;

[0017] Fig.12 is a schematic plan view of a cover plate according to certain embodiments of the present application;

[0018] Figures 13 to 15 is a flow chart of a method for making a cover plate according to certain embodiments of the present application;

[0019] Fig.16 It is a schematic diagram of the structure of an electronic device of certain embodiments of the present application.

[0020] Description of main component symbols:

[0021] 1000, electronic device; 100, cover plate; 200, body; 11, substrate; 13, coating; 15, texture; 131, diaphragm; 1311, first side of diaphragm; 1313, second side of diaphragm; 132, shadowless adhesive layer; 1321, first adhesive layer; 1323, second adhesive layer; 133, optical coating; 134, shielding layer; 135, substrate layer; 136, optical adhesive layer; 31, release film; 33, sheet material to be thinned; 35, composite film; 37, intermediate diaphragm; 39, thinned film material; 50, thinning equipment; X, stretching direction; 51, unwinding assembly; 511, unwinding roller; 53, heating assembly; 531, heating roller; 501, first gap; 55, traction assembly; 551, traction roller; 503, second gap; 5511, liquid cooling channel. DETAILED DESCRIPTION

[0022] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of the present application, and cannot be understood as limiting the embodiments of the present application.

[0023] In the description of the present application, it should be understood that the terms "thickness", "upper", "top", "bottom", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0024] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. In an example, it can be a fixed connection, or a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection, or they can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements.

[0025] Glass Deco Film (GDF) is one of the common manufacturing processes for electronic device cover plates. During the manufacturing process of the cover plate, the thickness of the film will affect the optical effect of the cover plate, and the glare effect of the manufactured cover plate is not good. In addition, the film that is too thick has a higher hardness and is more difficult to bend, making it difficult to continuously produce, process and cut the film, which affects the manufacturing efficiency of the cover plate.

[0026] In order to solve the above problems, the present application provides a method for manufacturing a membrane, a method for manufacturing a cover plate, a cover plate 100 and an electronic device 1000 .

[0027] See also Figure 1 , Figure 2 and Figure 4 , the method for making the diaphragm of the present application comprises:

[0028] 011: Disposing release films 31 on opposite sides of the film to be removed 33 to form a composite film 35;

[0029] 013: hot pressing the opposite sides of the composite film 35, wherein the difference δT between the hot pressing temperature T and the glass transition temperature Tg of the film sheet 33 to be reduced is in the range of [15°C, 25°C];

[0030] 015: pulling and stretching the heated composite film 35 to thin the composite film 35; and

[0031] 017: Remove the release film 31 to obtain the target film 131.

[0032] Among them, the glass transition is a relaxation phenomenon of the amorphous part of the polymer from the glass state where the molecular chain cannot move to the highly elastic state where the molecular chain can move. The transition temperature corresponding to the glass state and the highly elastic state is the glass transition temperature Tg. When the temperature of the surface of the film sheet 33 to be reduced is at the glass transition temperature Tg, the degree of deformation of the film sheet 33 to be reduced after being subjected to force can be significantly increased, and the degree of deformation can be kept relatively stable within a certain temperature range. Therefore, as long as the temperature of the surface of the film sheet 33 to be reduced reaches the glass transition temperature Tg, the film sheet 33 to be reduced can be stretched and pulled to make the film sheet 33 to be reduced extend, thereby reducing the thickness of the film sheet 33 to be reduced.

[0033] See also Figure 2 , Figure 4 and Figure 5 , 013: The opposite sides of the hot-pressed composite film 35 include:

[0034] 0131: Two heating rollers 531 are used to heat press the opposite sides of the composite film 35, wherein the difference δT between the temperature T of the heating roller 531 and the glass transition temperature Tg of the film sheet 33 to be reduced is in the range of [15°C, 25°C].

[0035] The release film 31 is a film-like structure used to isolate the film sheet 33 to be reduced. The material of the release film 31 can be polyethylene terephthalate plastic (PET). The release film 31 has good heat resistance. Therefore, when the temperature on the surface of the release film 31 is high, the release film 31 will not undergo glass transition and adhere to the heating roller 531. At the same time, the overall shape of the release film 31 is relatively stable, and will not cause wrinkles and cracks on the film sheet 33 to be reduced.

[0036] Specifically, in some embodiments, the thickness of the release film 31 ranges from [50 μm, 100 μm], for example, the thickness of the release film 31 may be 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm or 100 μm, etc. When the thickness of the release film 31 is less than 50 μm, the release film 31 is not easy to separate from the film to be reduced sheet 33, and the release film 31 is easy to break. When the thickness of the release film 31 is greater than 100 μm, the heat transfer speed of the release film 31 is slow, and the heating roller 531 consumes more energy to make the film to be reduced sheet 33 reach the glass transition temperature Tg. Therefore, when the thickness of the release film 31 is in the range of [50μm, 100μm], the release film 31 is easy to separate from the film sheet 33 to be reduced, and the heat transfer speed of the release film 31 is fast, the heat loss is small, and the temperature of the heating roller 531 can be relatively low, saving energy.

[0037] More specifically, in some embodiments, at least one side of the release film 31 includes a release surface opposite to the film sheet 33 to be reduced. When the release film 31 and the film sheet 33 to be reduced form a composite film 35 together, the release surface of the release film 31 faces the film sheet 33 to be reduced so that the two can be attached together detachably. When the release surface of the release film 31 is attached to the film sheet 33 to be reduced, a release force is generated, and the release surface contains a release agent of silicone oil or non-silicone oil to change the magnitude of the release force of the release film 31. In some embodiments, the release force of the release film 31 ranges from [4g, 25g], for example: 4g, 6g, 8g, 10g, 12g, 14g, 16g, 18g, 20g, 22g, 24g or 25g, etc. In the case where the release force of the release film 31 is less than 4g, the release film 31 is easy to fall off and the attachment effect is not good. When the release force of the release film 31 is greater than 25g, the release film 31 is difficult to separate from the film sheet 33 to be reduced, and the target film 131 is easily damaged. Therefore, when the release force of the release film 31 is in the range of [4g, 25g], the release film 31 is easy to separate from the film sheet 33 to be reduced without damaging the surface of the film 131, and the adhesion effect of the release film 31 is better and it is not easy to fall off automatically. In some embodiments, the release film 31 includes a release surface and a non-release surface disposed opposite to each other. In other embodiments, the release film 31 includes two release surfaces disposed opposite to each other, wherein the release forces of the two release surfaces may be the same or different.

[0038] The film sheet 33 to be reduced is a polymer sheet structure or a sheet structure of a polymer composite inorganic material for manufacturing a battery cover 100 or a shell cover 100 of an electronic device 1000. Currently, the most commonly used film sheet 33 to be reduced can be acetate fiber, and the thickness of the film sheet 33 to be reduced ranges from [0.10mm, 0.20mm], for example: 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm or 0.20mm, etc. The flexibility of the molecular chain of the material of the film sheet 33 to be reduced and the type and content of the plasticizer in the film sheet 33 to be reduced will affect the glass transition temperature Tg of the film sheet 33 to be reduced. The cross-sectional size of the film sheet 33 to be reduced is determined by the size of the planer and the mold for making the film sheet 33 to be reduced, for example: 1300*700mm, 700*380mm or 700*180mm, etc. The film sheet 33 to be reduced of different sizes can be selected according to the size of the cover plate 100 to be made. Preferably, the thickness of the film sheet 33 to be reduced is in the range of [0.13mm, 0.18mm].

[0039] See also Figure 2 , Figure 4 and Figure 5 In some embodiments, 015: the composite film 35 after drawing, stretching and heating comprises:

[0040] 0151: The heated composite film 35 is pulled, stretched and processed by the pulling assembly 55 .

[0041] The composite film 35 is an intermediate product formed by combining the release film 31 and the film sheet 33 to be reduced during the production process of the film sheet 131. The release film 31 and the film sheet 33 to be reduced can be attached together detachably. When the traction component 55 pulls and stretches the heated composite film 35 along the stretching direction X, the thickness of the composite film 35 decreases. In some embodiments, the stretching direction X of the composite film 35 should be the length direction of the film sheet 33 to be reduced.

[0042] Specifically, in some embodiments, in order to completely isolate the film sheet 33 to be reduced from the heating roller 531 , the width of the release film 31 is greater than the width of the film sheet 33 to be reduced in the stretching direction X perpendicular to the composite film 35 , so as to completely cover the film sheet 33 to be reduced.

[0043] Preferably, in some embodiments, in the stretching direction X perpendicular to the composite film 35, the width of the release film 31 is greater than the width of the film sheet 33 to be reduced, and the difference between the single side widths of the release film 31 and the film sheet 33 to be reduced is greater than or equal to 20 mm. For example, the difference between the single side widths of the release film 31 and the film sheet 33 to be reduced can be 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm or 30 mm. In the case where the difference between the single side widths of the release film 31 and the film sheet 33 to be reduced is less than 20 mm, the film sheet 33 to be reduced may slide relative to the release film 31 in the stretching direction X perpendicular to the composite film 35 when passing through the heating roller 531 and the traction assembly 55. The film sheet 33 to be reduced is easily deviated from the coverage of the release film 31 and cannot be heated by the heating roller 531 and pulled and stretched by the traction assembly 55, resulting in uneven thickness of the film sheet 33 to be reduced. Therefore, when the difference in single-side width between the release film 31 and the film sheet 33 to be thinned is greater than or equal to 20 mm, the film sheet 33 to be thinned can be completely covered by the release film 31 both before and after thinning, and when the film sheet 33 to be thinned slides relative to the release film 31 in the stretching direction X perpendicular to the composite film 35, the release film 31 can still completely cover the film sheet 33 to be thinned, so that the thickness of the film sheet 33 to be thinned after thinning is more uniform.

[0044] In order to make the release film 31 and the film sheet 33 to be thinned after the composite film 35 is thinned to obtain the target film 131, the temperature that the release film 31 can withstand should be at least higher than the glass transition temperature Tg of the film sheet 33 to be thinned. Therefore, when the surface temperature of the composite film 35 reaches the glass transition temperature Tg of the film sheet 33 to be thinned, the release film 31 can still maintain stable properties and will not be plasticized, deformed or damaged. For example: In some embodiments, the film sheet 33 to be thinned is made of cellulose acetate material, and its glass transition temperature Tg ranges from [90°C to 110°C]. At this time, the temperature that the release film 31 can withstand is at least 150°C to ensure that there is no adhesion and adhesion between the release film 31 and the film sheet 33 to be thinned and between the release film 31 and the heating roller 531. The thickness of the target film 131 obtained after thinning ranges from [60 μm to 85 μm]. Compared with the unthinned film sheet 33, the target film 131 has better optical properties and is easy to bend or deform but not easy to break.

[0045] The thinning device 50 of the film is required to make the thinned target film 131. The thinning device 50 includes an unwinding component 51, a heating component 53 and a pulling component 55 arranged in sequence. The composite film 35 can move in the thinning device 50. The direction from the unwinding component 51 to the pulling component 55 is the stretching direction X of the composite film 35 and the moving direction of the composite film 35. The unwinding component 51 can be connected with the release film 31 and make the release film 31 attached to the opposite sides of the film sheet 33 to be thinned. The heating component 53 can contact with the formed composite film 35. When the temperature of the surface of the heating component 53 is high, the heating component 53 can heat the composite film 35 and make the composite film 35 heat up. At this time, the temperature of the film sheet 33 to be thinned in the composite film 35 at least reaches the glass transition temperature of the film sheet 33 to be thinned. The pulling component 55 can contact with the heated composite film 35 and pull and stretch the composite film 35. Since the film sheet 33 to be reduced in the composite film 35 is deformed by the tension and the release film 31 has not reached the glass transition temperature Tg, the thickness of the composite film 35 is reduced and the thickness of the film sheet 33 to be reduced in the composite film 35 is reduced.

[0046] In the method for manufacturing the diaphragm of the present application, the glass transition temperature of the release film 31 is generally higher than the glass transition temperature of the film sheet 33 to be reduced. Therefore, in the process of heating the composite film 35 and pulling and stretching the composite film 35 by the pulling component 55, the film sheet 33 to be reduced will be stretched, deformed and thinned, while the thickness of the release film 31 will not change, and there will be no adhesion between the release film 31 and the heating device, which can improve the manufacturing efficiency of the diaphragm 131.

[0047] The method for manufacturing the diaphragm is further described below with reference to the accompanying drawings.

[0048] See also Figure 2 , Figure 4 and Figure 6 In some embodiments, 011: a release film 31 is disposed on opposite sides of a film-reducing sheet 33 to form a composite film 35, comprising:

[0049] 0111: Make the opposite sides of the film sheet 33 to be reduced respectively combine with the traction ends of the release film 31 on the unwinding roller 511 on the corresponding sides; and

[0050] 0113: The portion of the film sheet 33 to be reduced combined with the traction end is allowed to enter the first gap 501, and the two heating rollers 531 and the two unwinding rollers 511 are driven to rotate, so that the film sheet 33 to be reduced and the release film 31 entering the first gap 501 are combined to form a composite film 35.

[0051] Specifically, in some embodiments, the unwinding assembly 51 includes two unwinding rollers 511, and an unwinding roller 511 is respectively provided on opposite sides of the film to be reduced sheet 33, and each unwinding roller 511 is wound with a release film 31, and the traction end of the release film 31 is the end of the release film 31 exposed on the wound release film 31, which is also the head end. The traction end of the release film 31 can be manually or mechanically adhered to the end of the film to be reduced sheet 33 closest to the heating assembly 53. Both unwinding rollers 511 can rotate, and the rotation directions of the two unwinding rollers 511 are different. When both unwinding rollers 511 are rotating and the end of the film sheet 33 to be reduced closest to the heating component 53 moves toward the heating component 53, the release film 31 wrapped on the unwinding roller 511 gradually separates from the unwinding roller 511, and the traction end of the release film 31 gradually moves and covers the opposite sides of the film sheet 33 to be reduced under the action of the heating component 53, so as to shield the film sheet 33 to be reduced and form a composite film 35.

[0052] More specifically, in some embodiments, the heating assembly 53 includes two heating rollers 531 disposed on opposite sides of the film to be reduced 33, the heating rollers 531 are rotatable, and the heating methods of the heating rollers 531 include, but are not limited to, electric heating, oil heating, or electromagnetic heating. The heating methods of the heating rollers 531 include at least one of electric heating, oil heating, or electromagnetic heating. There is a first gap 501 between the two heating rollers 531. When the film to be reduced 33 moves relative to the two heating rollers 531 along the stretching direction X and extends into the first gap 501, the two heating rollers 531 respectively contact the two layers of release film 31 on opposite sides of the film to be reduced 33, so as to press the release film 31 against the opposite sides of the film to be reduced 33 to form a composite film 35.

[0053] Furthermore, in some embodiments, the linear speed V1 of the unwinding roller 511 is the same as the linear speed V2 of the heating roller 531 , so that no traction or stretching occurs between the release film 31 and the heating roller 531 , thereby preventing the release film 31 from breaking.

[0054] Preferably, in some embodiments, the linear velocity V2 of the heating roller 531 is in the range of [0.5 m / min, 5 m / min]. When the linear velocity V2 of the heating roller 531 is less than 0.5 m / min, the manufacturing process of the film 131 is too long and the working efficiency is low. When the linear velocity V2 of the heating roller 531 is greater than 5 m / min, the heating time of the composite film 35 by the heating roller 531 is too short, and the film sheet 33 to be thinned in the composite film 35 cannot reach the glass transition temperature Tg, and it is difficult to stretch the composite film 35. Therefore, when the linear velocity V2 of the heating roller 531 is in the range of [0.5 m / min, 5 m / min], the manufacturing efficiency of the film 131 is high, and the film sheet 33 to be thinned can be fully heated for stretching and thinning.

[0055] See also Figure 2 , Figure 4 and Figure 7 In some embodiments, 0131: using two heated rollers 531 to heat press the opposite sides of the composite film 35, including:

[0056] 01311: before the film-reducing sheet 33 and the release film 31 enter the first gap 501 , the film-reducing sheet 33 and the release film 31 are preheated by heat radiation from the heating roller 531 ; and

[0057] 01313: When the film sheet 33 and the release film 31 enter the first gap 501 and form a composite film 35 , the two heating rollers 531 are driven to rotate and the composite film 35 is heated by the heating rollers 531 in contact.

[0058] Since the surface temperature of the heating roller 531 is relatively high, when the film sheet 33 to be reduced and the release film 31 gradually move to a position close to the heating roller 531, the heating roller 531 can emit heat radiation to the film sheet 33 to be reduced and the release film 31 to increase the surface temperature of the film sheet 33 to be reduced and the release film 31, wherein the release film 31 can transfer a small amount of heat to the film sheet 33 to be reduced inside. When the film sheet 33 to be reduced and the release film 31 enter the first gap 501 and form a composite film 35, the heating roller 531 can contact the release film 31 and heat the release film 31, and at this time, the release film 31 transfers more heat to the film sheet 33 to be reduced inside, so that the surface temperature of the film sheet 33 to be reduced quickly increases to the glass transition temperature Tg.

[0059] Furthermore, in some embodiments, in the stretching direction X perpendicular to the composite film 35, the width of the heating roller 531 is greater than the width of the release film 31, so that the entire range of the composite film 35 can be heated by the heating roller 531. For example, in some embodiments, the roller diameter of the heating roller 531 is greater than or equal to 250 mm, so that the entire composite film 35 is in full contact with the heating roller 531.

[0060] Preferably, in some embodiments, in the stretching direction X perpendicular to the composite film 35, the width of the heating roller 531 is greater than the width of the release film 31, and the difference in single-side width between the heating roller 531 and the release film 31 is greater than or equal to 10 mm, so as to prevent part of the structure of the composite film 35 from extending beyond the contact surface between the heating roller 531 and the release film 31.

[0061] In order to make the surface of the target film 131 smooth without depressions, protrusions or scratches, the surface where the heating roller 531 contacts the release film 31 should be a mirror surface, that is, the surface where the heating roller 531 contacts the release film 31 has a very low roughness.

[0062] See also Figure 2 , Figure 4 and Figure 8 In some embodiments, 0151: using a traction assembly 55 to traction-stretch the heated composite film 35, comprising:

[0063] 01511: When the heated composite film 35 enters the second gap 503, the two pulling rollers 551 clamp the composite film 35; and

[0064] 01513: Drive the two pulling rollers 551 to rotate to stretch the composite film 35 to thin the composite film 35.

[0065] In some embodiments, the traction assembly 55 includes two traction rollers 551 disposed opposite to each other, and a second gap 503 is formed between the two traction rollers 551. When the heated composite film 35 moves and extends into the second gap 503, both traction rollers 551 are in contact with the composite film 35. In some embodiments, the first gap 501 and the second gap 503 are the same size, and the thinning device 50 thins the thickness of the composite film 35 only by traction and stretching of the traction assembly 55. In other embodiments, the second gap 503 is smaller than the first gap 501, so when the heated composite film 35 moves and extends into the second gap 503, the two traction rollers 551 can squeeze the composite film 35 while traction and stretching the composite film 35, thereby further thinning the thickness of the composite film 35.

[0066] Furthermore, a liquid cooling channel 5511 may be provided in the traction roller 551, and the liquid cooling channel 5511 may pass through the traction roller 551 in a direction perpendicular to the stretching direction X, or may be arranged around the traction roller 551. A coolant with a high specific heat capacity flows in the liquid cooling channel 5511, and the types of the coolant include but are not limited to water, propylene glycol, or ethylene glycol.

[0067] In order to quickly shape the thinned composite film 35, the temperature of the pulling roller 551 should be lower than the temperature of the heating roller 531. Specifically, the temperature range of the pulling roller 551 is [20°C, 40°C]. When the temperature of the pulling roller 551 is lower than 20°C, the thinned film material 39 in the composite film 35 is shaped too quickly, and cracks and wrinkles are likely to appear. When the temperature of the pulling roller 551 is higher than 40°C, the thinned film material 39 in the composite film 35 is difficult to shape and may be pulled again, resulting in uneven thickness of the thinned film material 39. Therefore, when the temperature of the pulling roller 551 is in the range of [20°C, 40°C], the thinned film material 39 has a uniform thickness and is not prone to wrinkles or cracks.

[0068] In order for the pulling roller 551 to stretch the composite film 35 , the linear velocity V3 of the pulling roller 551 should be greater than the linear velocity V2 of the heating roller 531 to generate a pulling force along the moving direction of the composite film 35 .

[0069] Preferably, in some embodiments, the linear speed V3 of the pulling roller 551 is 5% to 20% greater than the linear speed V2 of the heating roller 531. When the difference between the linear speed V3 of the pulling roller 551 and the linear speed V2 of the heating roller 531 is less than 5%, the pulling force of the pulling roller 551 is too small, and the thickness of the thinned film 39 is too large. When the difference between the linear speed V3 of the pulling roller 551 and the linear speed V2 of the heating roller 531 is greater than 20%, the pulling force of the pulling roller 551 is too large, which easily causes the composite film 35 to break. Therefore, when the linear speed V3 of the pulling roller 551 is 5% to 20% greater than the linear speed V2 of the heating roller 531, the obtained thinned film 39 has a moderate thickness and will not be pulled and broken by the pulling roller 551.

[0070] Since the film sheet 33 to be thinned is processed by a planer and forms a sheet structure, the film sheet 33 to be thinned may be uneven in thickness. In order to make the thickness of the target film sheet 131 after thinning uniform, the size of the first gap 501 and / or the second gap 503 can be a fixed value, so that when the composite film 35 passes through the heating roller 531 and the pulling roller 551, the heating roller 531 and the pulling roller 551 respectively squeeze the composite film 35, so that the film sheet 33 to be thinned in the composite film 35 is pressed into a target film sheet 131 with a fixed thickness.

[0071] See also Figure 3 , Figure 4 and Fig. 9 In some embodiments, 017: removing the release film 31 to obtain the target film 131 includes:

[0072] 0171: Remove the release film 31 to obtain the thinned film material 39; and

[0073] 0173: Cut the thinned film material 39 to obtain the target film 131.

[0074] Since the release film 31 can be detachably connected to the film sheet 33 to be thinned, and the glass transition temperature of the release film 31 is higher than the glass transition temperature Tg of the film sheet 33 to be thinned, after the film sheet 33 to be thinned is thinned, the release film 31 can be separated from the thinned film material 39, and according to the size of the cover plate 100 to be manufactured, the thinned film material 39 can be cut to obtain the target film sheet 131 for manufacturing the cover plate 100.

[0075] See also Figure 2 , Figure 4 and Fig.10 In some other embodiments, the method for manufacturing the membrane may further include:

[0076] 016: Cutting the thinned composite film 35 to obtain a plurality of intermediate film sheets 37.

[0077] When the intermediate film 37 is obtained, 017: removing the release film 31 to obtain the target film 131 may include:

[0078] 0175: Remove the release film 31 on the intermediate film 37 to obtain the target film 131.

[0079] In the solution of first cutting the thinned composite film 35 into a plurality of intermediate film sheets 37 , the unremoved release film 31 can protect the surface of the target film sheet 131 and prevent the film sheet 131 from being scratched.

[0080] The following is a comparative example and two specific embodiments to illustrate the thinning effect of the film manufacturing method of the present application. The thickness of the film sheet 33 to be thinned ranges from [140 μm to 150 μm], the surface temperature of the heating roller 531 is 120°C, and the linear speed V2 of the heating roller 531 is 1.0 m / min.

[0081] In the case where the surface of the film sheet 33 to be thinned is not covered with a release film, the film sheet 33 to be thinned is directly fed into the first gap 501 between the heating rollers 531, and the glass transition temperature Tg of the film sheet 33 to be thinned is 105°C. After being heated and squeezed by the heating rollers 531, the film sheet 33 to be thinned is thinned, but since the surface temperature of the heating rollers 531 is relatively high, the target film sheet 131 formed after thinning will be tightly attached to the roller surface of the heating rollers 531, making it difficult to separate the target film sheet 131 from the heating rollers 531. When the target film sheet 131 is peeled off manually, since the surface temperature of the target film sheet 131 is almost equal to the temperature of the heating rollers 531, the peeled target film sheet 131 is very easy to wrinkle or deform.

[0082] In the case where both sides of the film sheet 33 to be thinned are covered with release films 31, the release force between the release films 31 and the film sheet 33 to be thinned will also affect the quality of the target film obtained after thinning. After both sides of the film sheet 33 to be thinned are covered with release films 31, it is necessary to adjust the formula of the film sheet 33 to be thinned to reduce the glass transition temperature Tg of the film sheet 33 to be thinned, so as to avoid the film sheet 33 to be thinned after being covered with release films 31. The film cannot reach the glass transition temperature Tg, making it difficult to perform thinning operations. Specifically, the glass transition temperature Tg of the film sheet 33 to be thinned is 98°C.

[0083] In some embodiments, the release force of the release film 31 is about 1-3g, and the thickness of the release film is 80μm. Since the release force between the release film 31 and the film sheet 33 to be reduced is very low, the adhesion between the release film 31 and the film sheet 33 to be reduced is very low. Therefore, when the traction roller 551 stretches the composite film 35 formed by the release film 31 and the film sheet 33 to be reduced, the thinned film sheet 33 and the release film 31 will slip. This results in a poor thinning effect, and the thickness of the target film 131 is uneven, and the thickness of the target film 131 ranges from [80μm, 100μm].

[0084] In other embodiments, the release film 31 is a non-silicone release film without silicone oil, and the release force of the release film 31 is about 18-20g. At this time, the adhesion between the release film 31 and the film sheet 33 to be reduced is relatively large. Therefore, when the traction roller 551 stretches the composite film 35 formed by the release film 31 and the film sheet 33 to be reduced, the thinned film sheet 33 to be reduced and the release film 31 will not slip. The thickness of the formed target film 131 is in the range of [70μm, 85μm].

[0085] Accordingly, the film manufacturing method of the present application can thin the film sheet 33 with a thickness in the range of [130 μm, 180 μm] to a target film 131 with a thickness in the range of [60 μm, 90 μm].

[0086] See also Fig.11 and Fig.12 In some embodiments, the present application further provides a cover plate 100, the cover plate 100 includes a substrate 11 and a coating 13, the coating 13 has a texture 15, the coating 13 is arranged on one side of the substrate 11, the coating 13 includes a film 131, a shadowless adhesive layer 132 and an optical coating 133, the shadowless adhesive layer 132 is respectively arranged on two opposite sides of the film 131, at least one side of the shadowless adhesive layer 132 has the texture 15, the optical coating 133 is arranged on the side of the shadowless adhesive layer 132 with the texture 15 away from the film 131, and the optical coating 133 is used to change the optical effect formed by the coating 13.

[0087] Specifically, the film 131 is a polymer film structure manufactured by the film manufacturing method in any of the above embodiments, and the surface of the film 131 can be coated with a shadowless adhesive to form a shadowless adhesive layer 132 .

[0088] The shadowless adhesive refers to an etch-resistant thin film material whose solubility changes by irradiation or radiation of ultraviolet light, electron beam, ion beam, X-ray, etc. The shadowless adhesive coated on the surface of the film 131 has fluidity, so that the texture 15 can be formed by photolithography or transfer. Then, the shadowless adhesive can be cured by irradiating the shadowless adhesive with ultraviolet light to form a shadowless adhesive layer 132.

[0089] Optical coating 133 is a technology that deposits thin films on the surface of an object. It deposits thin films of various materials on the surface of the object to change the optical properties of the surface. Common optical coating 133 materials include silicon nitride (SiN x ), silicon oxide (SiO2), aluminum oxide (Al2O3), magnesium fluoride (MgF2), zinc oxide (ZnO), etc. The optical coating 133 can add different optical effects such as color, reflectivity and brightness to the product, thereby improving the attractiveness and quality of the product. At the same time, the optical coating 133 can also provide the electronic device 1000 with anti-fingerprint, scratch resistance, wear resistance and other functions, providing users with a better user experience. Applying the optical coating 133 on the side where the texture 15 is set can also avoid irregular reflections and light refractions at the texture 15, thereby maintaining the texture and clarity of the texture 15.

[0090] Further, in some embodiments, the film 131 includes a first side 1311 and a second side 1313 opposite to each other, the first side 1311 of the film 131 faces the substrate 11, the second side 1313 of the film 131 faces the side away from the substrate 11, the first side 1311 of the film 131 is provided with a first adhesive layer 1321 formed by curing the shadowless adhesive, the second side 1313 of the film 131 is provided with a second adhesive layer 1323 formed by curing the shadowless adhesive, and the first adhesive layer 1321 and the second adhesive layer 1323 are separated from each other. In some embodiments, the surface of the second adhesive layer 1323 has a texture 15, and the optical coating 133 is provided on the side of the second adhesive layer 1323 away from the film 131. In other embodiments, the surfaces of the first adhesive layer 1321 and the second adhesive layer 1323 both have a texture 15, and the optical coating 133 is provided on the side of the first adhesive layer 1321 and the second adhesive layer 1323 away from the film 131 to protect the texture 15.

[0091] Furthermore, in some embodiments, the cover plate 100 further includes a shielding layer 134, which is disposed on a side of the optical coating 133 away from the second adhesive layer 1323, and the shielding layer 134 can partially cover the optical coating 133. Specifically, the shielding layer 134 is a structure formed by silk-screening black cover ink on the optical coating 133, and the shielding layer 134 can improve the printing effect and product quality, and make the texture 15 clearer.

[0092] Furthermore, in some embodiments, the cover plate 100 also includes a substrate layer 135, which is disposed on a side of the shielding layer 134 away from the optical coating 133, and the substrate layer 135 is used to reduce the reflectivity of the cover plate 100. Specifically, the substrate layer 135 is a structure formed by continuously screen-printing black matte ink on the black cover bottom ink forming the shielding layer 134. Black matte ink is a non-luminous ink with a rough surface texture, which can effectively reduce the reflectivity of the product and make the product look more upscale. In a dimly lit environment, the matte effect is more significant. At the same time, the black matte ink also has covering power, which can better cover the black background at the bottom, making the printed pattern fuller and clearer.

[0093] Furthermore, in some embodiments, the cover plate 100 further includes an optical adhesive layer 136, which is a connection layer formed by curing an optical adhesive, and is disposed between the first adhesive layer 1321 and the substrate 11, and is used to connect the cover film 13 and the substrate 11. Optical Clear Adhesive (OCA) is a special double-sided adhesive that is optically transparent without a substrate, and the optical adhesive can completely adhere the cover film 13 and the substrate 11 together in a seamless manner, so that the reflective optical effect of the cover film 13 is better, and dust and water vapor are prevented from entering the cover plate 100.

[0094] See also Fig.11 , Fig.12 and Fig.13 This embodiment also provides a method for manufacturing a cover plate, comprising:

[0095] 021: making target membrane 131;

[0096] 023: The shadowless adhesive is transferred to opposite sides of the film 131 respectively, and the shadowless adhesive surface of at least one side of the film 131 has a texture 15;

[0097] 025: forming an optical coating 133 on the side of the film 131 where the texture 15 is formed, so as to form a coating 13 having the texture 15; and

[0098] 027: Fix the coating 13 on the substrate 11 to form the cover 100.

[0099] The target film 131 is made by the film making method of any of the above-mentioned embodiments. After the shadowless adhesive is transferred, the opposite sides of the film 131 can form a first adhesive layer 1321 and a second adhesive layer 1323 separated from each other. In some embodiments, the surface of one of the first adhesive layer 1321 and the second adhesive layer 1323 is provided with a texture 15. In other embodiments, both the first adhesive layer 1321 and the second adhesive layer 1323 are provided with a texture 15. The optical coating 133 is formed on the surface of the adhesive layer provided with the texture 15 and can protect the texture 15 and form a variety of optical effects. After the coating 13 with the texture 15 is formed, the coating 13 can be fixed on the substrate 11 to form a cover plate 100 with the texture 15 and a variety of optical effects.

[0100] See also Fig.11 , Fig.12 and Fig.14 In some embodiments, 027: fixing the coating 13 on the substrate 11 includes:

[0101] 0271: Coating optical glue on the side of the coating 13 where the optical coating 133 is not formed; and

[0102] 0273: The coating 13 is pasted on the substrate 11 to form the cover 100, and the optical glue is arranged between the coating 13 and the substrate 11.

[0103] The optical adhesive can completely adhere the coating 13 and the substrate 11 together without gaps, so that the coating 13 can reflect better optical effects and prevent dust and water vapor from entering the cover 100. Since the surface structure of the coating 13 is complex and the thickness of the coating 13 is small, the optical adhesive should be applied on the substrate 11. Applying the optical adhesive on the side of the coating 13 where the optical coating 133 is formed may damage the optical coating 133 and affect the optical effect of the backplane.

[0104] See also Fig.11 , Fig.12 and Fig.15 In some embodiments, the method for manufacturing the cover plate further comprises:

[0105] 028: Making a shielding layer 134 on the surface of the optical coating 133, wherein the shielding layer 134 is used to partially cover the optical coating 133; and

[0106] 029: A backing layer is made on the surface of the shielding layer 134 , and the backing layer is used to reduce the reflectivity of the coating 13 .

[0107] Specifically, the shielding layer 134 is a structure formed by screen-printing black cover ink on the optical coating 133. The shielding layer 134 can improve the printing effect and the quality of the product and make the texture 15 clearer. The substrate layer 135 is a structure formed by continuing to screen-print black matte ink on the black cover ink forming the shielding layer 134. Black matte ink is a non-luminous ink with a rough surface texture, which can effectively reduce the reflectivity of the product and make the product look more upscale. In a dimly lit environment, the matte effect is more significant. At the same time, black matte ink also has covering power, which can better cover the black background at the bottom, making the printed pattern fuller and clearer.

[0108] See also Fig.11 and Fig.16 In some embodiments, the present application further provides an electronic device 1000 , which includes a main body 200 and a cover plate 100 of any of the above embodiments, and the cover plate 100 is installed on the main body 200 .

[0109] Since the film 131 in the cover plate 100 has a small thickness, when manufacturing the cover plate 100 , the film 131 can adapt to the curvature of the cover plate 100 , is not easy to break, and can achieve a variety of different optical effects.

[0110] In the description of this specification, the descriptions with reference to the terms "certain embodiments", "in an example", "exemplarily", etc., mean that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0111] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for manufacturing a diaphragm, characterized in that: include: Disposing release films on opposite sides of the film to be reduced to form a composite film; Hot pressing opposite sides of the composite film, and pulling and stretching the heated composite film to thin the composite film, wherein the difference δT between the hot pressing temperature T and the glass transition temperature Tg of the sheet to be thinned is in the range of [15°C, 25°C]; and The release film is removed to obtain a target film.

2. The method according to claim 1, characterized in that: The step of hot pressing the opposite sides of the composite film and pulling and stretching the heated composite film to thin the composite film comprises: Using two heating rollers to heat press the opposite sides of the composite film, wherein the difference δT between the temperature T of the heating rollers and the glass transition temperature Tg of the film to be reduced is in the range of [15°C, 25°C]; and The heated composite film is pulled, stretched and thinned by a pulling component.

3. The method according to claim 2, characterized in that: There is a first gap between the two heating rollers, and a reel is provided on opposite sides of the film to be reduced, each of which is wound with the release film; the release film is arranged on opposite sides of the film to be reduced to form a composite film, including: The two opposite sides of the film-reducing sheet are respectively combined with the traction ends of the release film on the unwinding roller on the corresponding sides; and The portion of the film-reducing sheet combined with the traction end is made to enter the first gap, and the two heating rollers and the two unwinding rollers are driven to rotate, so that the film-reducing sheet and the release film entering the first gap are combined to form the composite film.

4. The method according to claim 3, characterized in that: The release film is made of polyethylene terephthalate plastic; and / or The release surface of the release film contains silicone oil or a non-silicone oil release agent; and / or The release force of the release film is in the range of [4g, 25g]; and / or The thickness of the release film is in the range of [50 μm, 100 μm]; and / or In the stretching direction perpendicular to the composite film, the width of the release film is greater than the width of the film sheet to be reduced; and / or In the stretching direction perpendicular to the composite film, the difference between the single side width of the release film and the sheet material to be reduced is greater than or equal to 20 mm; and / or The linear speed V1 of the unwinding roller is the same as the linear speed V2 of the heating roller.

5. The method according to claim 2, characterized in that: There is a first gap between the two heating rollers, and the method of using the two heating rollers to heat-press the opposite sides of the composite film includes: Before the sheet material to be de-filmed and the release film enter the first gap, preheating the sheet material to be de-filmed and the release film by heat radiation from the heating roller; and When the sheet material to be reduced and the release film enter the first gap and form the composite film, the two heating rollers are driven to rotate and the composite film is contact-heated by the heating rollers.

6. The method according to claim 2, characterized in that: In a direction perpendicular to the stretching direction of the composite film, the width of the heating roller is greater than the width of the release film; and / or In the stretching direction perpendicular to the composite film, the difference between the single side width of the heating roller and the release film is greater than or equal to 10 mm; and / or The roller diameter of the heating roller is greater than or equal to 250 mm; and / or The heating roller is heated by at least one of electric heating, oil heating and electromagnetic heating; and / or The linear velocity V2 of the heating roller is in the range of [0.5 m / min, 5 m / min].

7. The manufacturing method according to claim 2, characterized in that: The traction assembly comprises two traction rollers arranged opposite to each other, and a second gap is formed between the two traction rollers; and the traction of the composite film after stretching and heating by the traction assembly comprises: When the heated composite film enters the second gap, the two traction rollers clamp the composite film; and The two pulling rollers are driven to rotate to stretch the composite film so as to thin the composite film.

8. The method according to claim 7, characterized in that: The temperature of the traction roller is in the range of [20°C, 40°C]; and / or A liquid cooling channel is provided in the traction roller; and / or The linear speed V3 of the traction roller is greater than the linear speed V2 of the heating roller; and / or The linear speed V3 of the traction roller is 5% to 20% greater than the linear speed V2 of the heating roller.

9. A method for manufacturing a cover plate, characterized in that: include: The target membrane is manufactured by the membrane manufacturing method according to any one of claims 1 to 8; Transferring shadowless adhesive on opposite sides of the film, respectively, wherein the shadowless adhesive surface on at least one side of the film has a texture; Making an optical coating on the side of the film where the texture is formed to form a coating with the texture; and The coating is fixed on the substrate to form a cover plate.

10. The manufacturing method according to claim 9, characterized in that: The step of fixing the coating on the substrate comprises: Applying optical glue on the side of the coating where the optical coating is not formed; and The covering film is pasted on the substrate to form a cover plate, and the optical adhesive is arranged between the covering film and the substrate.

11. The manufacturing method according to claim 9, characterized in that: The production method further comprises: Making a shielding layer on the surface of the optical coating, wherein the shielding layer is used to partially cover the optical coating; and A backing layer is made on the surface of the shielding layer, and the backing layer is used to reduce the reflectivity of the coating.

12. A cover plate, characterized in that: include: substrate; and A coating, wherein the coating has a texture and is disposed on one side of the substrate. The coating comprises a diaphragm manufactured by the method for manufacturing a diaphragm according to any one of claims 1 to 8, a shadowless adhesive layer and an optical coating, wherein the shadowless adhesive layers are respectively disposed on opposite sides of the diaphragm, and at least one side of the shadowless adhesive layer has the texture, and the optical coating is disposed on a side of the shadowless adhesive layer having the texture away from the diaphragm, and the optical coating is used to change the optical effect formed by the coating.

13. The cover plate according to claim 12, characterized in that: The diaphragm includes a first side and a second side opposite to each other. The first side of the diaphragm is provided with a first adhesive layer, the second side of the diaphragm is provided with a second adhesive layer, the surface of the second adhesive layer has the texture, and the optical coating is provided on the side of the second adhesive layer away from the diaphragm.

14. The cover plate according to claim 13, characterized in that: The cover plate also includes: a shielding layer, the shielding layer being disposed on a side of the optical coating away from the second adhesive layer, the shielding layer being used to partially cover the optical coating; and A substrate layer is provided on a side of the shielding layer away from the optical coating, and the substrate layer is used to reduce the reflectivity of the cover plate.

15. The cover plate according to claim 13, characterized in that: The cover plate also includes: An optical adhesive layer is disposed between the first adhesive layer and the substrate, and is used to connect the cover film and the substrate.

16. An electronic device, characterized in that: include: the entity; and The cover plate according to any one of claims 12 to 15, wherein the cover plate is mounted on the body.

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