Preparation method of earphone decorative sheet and earphone decorative sheet

Abstract

The present invention discloses a preparation method of an earphone decorative sheet and an earphone decorative sheet, wherein a decorative sheet substrate is obtained by glue dripping molding, and the decorative sheet substrate is subjected to edge shaping treatment, and then the decorative sheet substrate is subjected to treatment agent spraying and primer spraying treatment, and then the decorative sheet substrate is subjected to NCVM treatment, and then the decorative sheet substrate is subjected to intermediate paint spraying and topcoat spraying treatment, and finally the earphone decorative sheet is obtained. Compared with the prior art, the preparation method of the earphone decorative sheet provided by the present invention improves the appearance effect of the earphone decorative sheet by combining glue dripping molding with NCVM process, performing edge shaping treatment on the decorative sheet substrate and controlling the thickness of the paint layer, and improves the anti-fragmentation, anti-corrosion and anti-wear performance of the earphone decorative sheet.

Description

Technical Field

[0001] The present invention relates to the technical field of earphone accessory components, and in particular to a method for preparing an earphone decorative sheet and the earphone decorative sheet. Background Art

[0002] With the continuous development of personal smart wearable devices, the market requirements for headphones are constantly increasing, especially in terms of the shape, appearance and texture of headphones. Most existing headphones usually do not decorate the appearance of the headphones. Only a few headphones attach decorative sheets to the outer shell of the headphones to decorate the headphones, resulting in insufficient overall aesthetics of the headphones. In addition, during the use of users, the existing decorative sheets are easily eroded and worn by human sweat, and cracks are easily formed when the headphones are bumped.

[0003] Therefore, the existing technology needs to be improved. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the existing decorative sheets are not aesthetically pleasing and are prone to erosion and wear during the use of headphones. After the decorative sheets are assembled with the back shell of the headphones, there are protruding edge corners, which cause stress concentration. When the headphones are bumped, cracks are prone to appear at the edge corners.

[0005] The technical solution adopted by the present invention to solve the technical problem is as follows:

[0006] In a first aspect, the present invention provides a method for preparing an earphone decorative sheet, comprising the following steps:

[0007] PC material is used for drip molding to obtain a decorative sheet substrate with a concave shape in the middle, and the decorative sheet substrate is subjected to film lamination treatment;

[0008] Clamping the decorative sheet substrate and performing edge trimming treatment on the decorative sheet substrate;

[0009] Pre-treating the decorative sheet substrate and spraying the decorative sheet substrate with a treatment agent so that the decorative sheet substrate is covered with a treatment agent paint layer with a thickness of 2um-4um;

[0010] Primer spraying is performed on the decorative sheet substrate so that the treatment agent paint layer is covered with a primer layer with a thickness of 15um-18um;

[0011] The decorative sheet substrate is subjected to NCVM process treatment; the primer layer is covered with a coating layer with a thickness of 80-90nm;

[0012] Spray the decorative sheet substrate with a mid-coat; cover the coating layer with a mid-coat layer with a thickness of 6um-8um;

[0013] The decorative sheet substrate is sprayed with topcoat so that the middle paint layer is covered with a topcoat layer with a thickness of 13um-17um, and an earphone decorative sheet is obtained.

[0014] In one implementation, the glue filling thickness of the middle portion of the decorative sheet substrate with a concave middle portion is not less than 0.05 mm.

[0015] In one implementation, the film pasting process specifically includes:

[0016] A protective film is attached to the decorative sheet substrate, and the ink is printed and baked;

[0017] An adsorption film is attached to the protective film.

[0018] In one implementation, the edge angle shaping process specifically includes:

[0019] Performing CCD positioning punching on the decorative sheet substrate to obtain a plurality of positioning holes;

[0020] According to the positioning holes, the decorative sheet substrate is CNC cut and formed;

[0021] Deburr the CNC-cut decorative sheet substrate.

[0022] In one implementation, the treatment agent used in the treatment agent spraying is a first crude oil agent, and the viscosity of the first crude oil agent is 8.2-8.8.

[0023] In one implementation, the primer used in the primer spraying includes a thin coating agent, a thick coating agent and a first diluent, and the mixing ratio is thin coating agent: thick coating agent: first diluent = 100:30:10.

[0024] In one implementation, the mid-coat used in the mid-coat spraying includes a second base oil and a second diluent, and the mixing ratio is second base oil: second diluent=100:5.

[0025] In one implementation, the topcoat used in the topcoat spraying includes hard paint, soft paint and a third diluent, and the mixing ratio is hard paint: soft paint: third diluent = 25:75:5.

[0026] In one implementation, the target material for electroplating during the NCVM process is pure indium.

[0027] In a second aspect, the present invention further provides an earphone decorative sheet, which is made by any one of the above-mentioned preparation methods.

[0028] Compared with the prior art, the beneficial effects of the present invention are: through the glue drip molding process, the surface of the prepared earphone decorative sheet is made concave, the edge of the decorative sheet substrate is trimmed, and then through the NCVM process, the earphone decorative sheet has a transparent metal texture, making it less likely for the earphone decorative sheet to be corroded, worn, or bumped and cracked, thereby improving the appearance and quality of the earphone decorative sheet.

[0029] More embodiments of the present invention can also achieve other favorable technical effects that are not listed one by one, which may be partially described below, and are expected and understandable to those skilled in the art after reading the present invention. The content of the present invention is intended to introduce the concepts and selections that will be further described below in the "Specific Implementation Methods" in a simplified form to help readers understand the present invention more easily. The content of the present invention is not intended to identify the key features or basic features of the subject matter claimed for protection, nor is it intended to be used to limit the scope of the subject matter claimed for protection. All of the above features will be understood to be exemplary only, and more features and purposes about structures and methods can be collected from the disclosure of the present invention. A more comprehensive display of the features, details, practicality and advantages of the present invention will be provided in the following written description of various embodiments of the present invention, illustrated in the drawings, and defined in the attached claims. Therefore, if the entire specification and claims and drawings are not further read, the many restrictive interpretations of the content of the present invention cannot be understood. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a specific flow chart of the method for preparing the earphone decorative sheet provided by the present invention;

[0031] Figure 2 yes Figure 1 The specific flow chart of step S01 shown;

[0032] Figure 3 yes Figure 1 The specific flow chart of step S02 shown;

[0033] Figure 4 yes Figure 1 The specific flow chart of step S03 is shown. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention clearer and more specific, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] It will be understood by those skilled in the art that, unless expressly stated, the singular forms "one", "said", and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may be intermediate elements. In addition, the "connection" or "coupling" used herein may include wireless connection or wireless coupling. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0036] In the description of the embodiments of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying 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 limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. It should be noted that the embodiments in the present invention and the features in the embodiments can be combined with each other without conflict.

[0038] The terms used herein are for the purpose of describing specific exemplary embodiments only and are not intended to limit the present invention. As used herein, unless otherwise clearly indicated in the context, the singular form is intended to include the plural form. It should also be understood that the terms "include" and / or "comprising" when used in the specification refer to the presence of the recorded features, integers, steps, operations, elements and / or parts, rather than excluding the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups thereof.

[0039] Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. As much as possible, the same reference numerals will be used throughout the drawings to refer to the same or similar parts. In the following description of the present invention, if a detailed description of the known functions and configurations incorporated herein would obscure the subject matter of the present invention, a detailed description of the known functions and configurations incorporated herein will be omitted. It will be understood by those skilled in the art that, for ease of description, any features shown in the drawings may be enlarged, reduced or simplified, and the drawings and elements of the drawings are not always shown to scale.

[0040] Please refer to 1- Figure 4 , Figure 1 is a specific flow chart of the method for preparing the earphone decorative sheet provided by the present invention, Figure 2 yes Figure 1 The specific flow chart of step S01 shown in FIG. Figure 3 yes Figure 1 The specific flow chart of step S02 shown in FIG. Figure 4 yes Figure 1 The specific flow chart of step S03 is shown.

[0041] The present invention provides a method for preparing an earphone decorative sheet, which comprises the following steps:

[0042] S01, using PC material to obtain a decorative sheet substrate with a concave middle portion by glue-drip molding, and performing film laminating treatment on the decorative sheet substrate;

[0043] S02, clamping the decorative sheet substrate and performing edge trimming treatment on the decorative sheet substrate;

[0044] S03, pre-treating the decorative sheet substrate, and spraying the decorative sheet substrate with a treatment agent, so that the decorative sheet substrate is covered with a treatment agent paint layer with a thickness of 2um-4um;

[0045] S04, spraying the decorative sheet substrate with a primer so that the treatment agent paint layer is covered with a primer layer with a thickness of 15um-18um;

[0046] S05, performing NCVM process on the decorative sheet substrate, so that the primer layer is covered with a coating layer with a thickness of 80-90 nm;

[0047] S06, spraying the decorative sheet substrate with a middle paint, so that the coating layer is covered with a middle paint layer with a thickness of 6um-8um;

[0048] S07, spraying the decorative sheet substrate with topcoat so that the middle paint layer is covered with a topcoat layer with a thickness of 13um-17um, and obtaining an earphone decorative sheet.

[0049] It can be understood that the decorative sheet substrate with a concave middle portion obtained by drip molding can effectively avoid the situation of decorative sheet breakage caused by machining and cutting, compared with the decorative sheet substrate with a concave middle portion obtained by machining and cutting, and the drip molding makes the decorative sheet substrate smoother as a whole, and the concave middle portion area can obtain a better touch feel. When the headphone decorative sheet is installed on the headphone, the concave middle portion area can be used to mark the control touch area of ​​the headphone, and the user can control the headphone by touching the concave middle portion area, so that the headphone decorative sheet achieves the effect of combining decoration and control.

[0050] By trimming the edges of the decorative sheet substrate, the headphone decorative sheet can be effectively prevented from having corners on the edges after being installed on the headphone, reducing the stress concentration of the headphone decorative sheet, and effectively preventing the headphone decorative sheet from cracking, colliding and breaking during use. The NCVM process and the control of the thickness of each paint layer covering the decorative sheet substrate can make the headphone decorative sheet more transparent, obtain a better appearance, and improve the anti-erosion and anti-wear capabilities of the headphone decorative sheet.

[0051] Specifically, in step S01, the thickness of the PC material is preferably 0.25 mm, and the glue used in the drip molding is of the model XY-8030-1. The glue filling thickness of the middle part of the decorative sheet substrate with a concave middle part is not less than 0.05 mm, preferably 0.08 mm.

[0052] It is understandable that during the glue dripping process, the amount of glue filling will affect the molding quality of the decorative sheet substrate, and thus affect the quality of the earphone decorative sheet. The amount of glue filling in the middle of the decorative sheet substrate is 0.08mm, which can effectively avoid the phenomenon of discoloration or fading in the middle of the decorative sheet due to too low a filling amount of glue in the middle, thereby ensuring the quality of the earphone decorative sheet.

[0053] In the process of glue dripping molding, in order to accelerate the speed of glue dripping molding and improve production efficiency, UV light strips can be used to assist curing to accelerate molding to obtain the decorative sheet substrate. Preferably, the UV light strips can be 4 2500W UV light strips.

[0054] In a preferred embodiment, the overall thickness of the decorative sheet substrate obtained after the glue-drip molding in step S01 is 0.65 mm, and the depth of the concave surface is 0.32 mm. Due to the presence of the concave surface in the middle of the decorative sheet substrate, the outer surface of the earphone decorative sheet is concave. When the earphone decorative sheet is bonded to the earphone, the concave surface serves to mark the touch area of ​​the earphone. At the same time, the concave design in the middle of the outer surface also improves the overall texture of the earphone product.

[0055] Furthermore, in step S01, the decorative sheet substrate is subjected to a film laminating process, which specifically includes:

[0056] S11, attaching a protective film to the decorative sheet substrate, and performing ink printing and baking;

[0057] S12, attaching an adsorption film on the protective film.

[0058] Specifically, in step S11, the protective film is a PE film with a thickness of 0.05 mm. The protective film plays a role of dust prevention and protection, preventing dust particles from falling on the decorative sheet substrate, and ensuring the effect of subsequent decorative sheet substrate processing. In the process of ink printing and baking, the thickness of the ink printing is preferably 0.012 mm, the baking time is preferably 30 minutes, and the baking temperature is controlled at 50°C.

[0059] In step S12, the adsorption film is selected from PET high-viscosity film with a thickness of 0.2 mm. The PET film is selected because the PET film has excellent mechanical properties, its toughness is relatively good among thermoplastics, and its tensile strength and impact strength are also relatively high compared to other films.

[0060] In this embodiment, the adsorption film is a PET high-viscosity film with a thickness of 0.2 mm. In the subsequent process of trimming the edge of the decorative sheet substrate, the adsorption film will be cut. The adsorption of the PET high-viscosity film can be used to stick to the product debris cut off. After the processing is completed, the adsorption film and the product debris can be torn off to prevent small debris from affecting the subsequent process.

[0061] Furthermore, the edge shaping process of the decorative sheet substrate in step S02 specifically includes:

[0062] S21, performing CCD positioning punching on the decorative sheet substrate to obtain a plurality of positioning holes,

[0063] S22, CNC cutting and shaping the decorative sheet substrate according to the positioning holes,

[0064] S23, cleaning burrs from the CNC-cut decorative sheet substrate.

[0065] Among them, in step S21, the aperture size of the positioning hole obtained by CCD positioning punching is 2mm. Specifically, the working bull's eye of the decorative sheet substrate is captured and obtained by CCD camera, and the operating system is analyzed and processed after imaging, and then the central processing unit controls the displacement of the X, Y axis and the die fixture. After reaching the specified position, the signal is transmitted, and the punching process can be performed to obtain the required positioning through hole. When CNC cutting is performed, the CNC props are cut and shaped along the positioning holes, and the accuracy of the cutting and shaping is ensured by the positioning holes. Preferably, the CNC cutter head speed can be set to 50000r / min, and the feed speed is 1000mm / min. It can be understood that through CNC cutting and forming, the edge angle of the earphone decorative sheet after being installed on the earphone can be effectively prevented, and stress concentration of the earphone decorative sheet can be avoided, which leads to cracks or collision and breakage of the earphone decorative sheet. After CNC cutting and forming is completed, use an air gun to clean the debris generated during the CNC processing, use a vacuum cleaner to suck out the debris inside the groove of the decorative sheet substrate, and then use alcohol to wipe the dust on the decorative sheet substrate to prepare for the subsequent processing of the decorative sheet substrate. At the same time, it also ensures the quality of the subsequent processing of the decorative sheet substrate.

[0066] Furthermore, the specific steps in step S03 include:

[0067] S31, clamping the decorative sheet substrate in a fixture, and performing flat spraying on the decorative sheet substrate;

[0068] S32, performing electrostatic dust removal on the decorative sheet substrate and then preheating it;

[0069] S33, spraying a treatment agent on the decorative sheet substrate that has completed the preheating treatment.

[0070] Specifically, in step S31, in order to prevent the fixture from scratching the decorative sheet substrate, a buffer, preferably a buffer cotton, may be filled at the abutment between the decorative sheet substrate and the fixture during clamping. Before flat spraying the decorative sheet substrate, the decorative sheet substrate may be brushed with white spirit to further clean the decorative sheet substrate and ensure the quality of subsequent flat spraying.

[0071] In step S32, the electrostatic dust removal treatment of the decorative sheet substrate can be carried out with the assistance of several electrostatic guns. After the dust removal is completed, the decorative sheet substrate is preheated. The preheating temperature is controlled at 70°C and the preheating time is 30 minutes. The preheating treatment of the decorative sheet substrate facilitates the painting operation of the subsequent process and ensures the quality of the subsequent process.

[0072] In step S33, the treatment agent used in the treatment agent spraying process is the first crude oil agent, and the viscosity of the first crude oil agent can be 8.2-8.8. After the first crude oil agent is sprayed, the decorative sheet substrate is baked for 3-7 minutes, and the baking temperature is ensured to be 60° C., so that a treatment agent paint layer with a thickness of 2um-4um is formed on the decorative sheet substrate.

[0073] Preferably, the first crude oil agent uses a paint numbered UV-X9, and the first crude oil agent is sprayed without adding boiling oil and water. The viscosity of the spraying is 8.5, the baking temperature is 60°C, the baking time can be 5 minutes, and the film thickness of the treatment agent paint layer obtained after baking is 3um. It can be understood that the film thickness of the treatment agent paint layer and the viscosity of the first crude oil agent will affect the effect of the subsequent primer spraying, and then affect the overall texture of the earphone decorative piece. The first crude oil agent with a viscosity of 8.5 is used for spraying to obtain a treatment agent paint layer with a film thickness of 3um. On the basis of ensuring the molding effect of the treatment agent paint layer, it avoids the phenomenon of sagging, accelerates the molding of the treatment agent paint layer, improves the production efficiency, and is also conducive to the molding of the subsequent primer layer.

[0074] Furthermore, in step S04, the primer used in the process of spraying the primer on the decorative sheet substrate includes a thin coating agent, a thick coating agent and a first diluent, and the mixing ratio is thin coating agent: thick coating agent: first diluent = 100:30:10. Among them, the viscosity of the primer is 8.2±0.3, the baking temperature is 55-65℃, the baking time is 8-10min, and the UV energy is controlled at 600mj / cm 2 .

[0075] Preferably, the thin coating agent is the paint numbered ZD-3D378, the thick coating agent is the paint numbered ZD-3D374, the first diluent is the diluent numbered UV-X8, and the mixing ratio is ZD-3D378: ZD-3D374: UV-X8 = 100: 30: 10. The viscosity of the primer is 8.2, the baking temperature is controlled at 60°C, and the baking time is 9 minutes, thereby obtaining a primer layer with a thickness of 16um.

[0076] It is understandable that by controlling the mixing ratio of the thin coating agent, the thick coating agent and the first diluent, the performance of the primer obtained and the quality of the primer layer obtained after spraying can be effectively ensured. Mixing the first diluent in the thin coating agent and the thick coating agent in this ratio can play a role in reconciliation and facilitate spraying. At the same time, the appropriate proportion of the first diluent can avoid the situation where the primer layer is bitten due to excessive proportion of the first diluent, thereby ensuring the quality of the primer layer obtained by spraying the primer, improving the overall texture effect of the earphone decorative sheet, and also providing a guarantee for the quality of the subsequent electroplating process.

[0077] Furthermore, in step S05, the target material for electroplating during the NCVM process is pure indium, and the temperature during the NCVM process is controlled at 35-40°C for 15-20 minutes to obtain a coating layer with a thickness of 80nm-90nm.

[0078] Preferably, the temperature of the NCVM process is controlled at 35°C for 15 minutes, and a coating layer with a thickness of 85nm is covered on the primer layer. It can be understood that the use of pure indium target material can ensure the quality of the coating layer formed by the NCVM process, and the NCVM technology can enable the decorative sheet substrate to obtain a metallic appearance, thereby improving the appearance effect of the decorative sheet substrate and thus improving the overall appearance texture of the headphone decorative sheet.

[0079] Further, in step S06, the intermediate paint used for intermediate paint spraying includes a second base oil and a second diluent, the mixing ratio of the second base oil: the second diluent = 100:5, the baking temperature is 55-65°C, the baking time is 8-10min, and the UV energy is controlled at 500-600j / cm 2 , so that the film thickness of the middle paint layer obtained by spraying the middle paint is 6um-8um.

[0080] Preferably, the second base agent is a paint numbered UV-203Z-97, the second diluent is a diluent numbered UV-X8, the mixing ratio is UV-203Z-97:UV-X8=100:5, the baking temperature is 60°C, the baking time is 8 minutes, and the UV energy is controlled at 550j / cm 2 , and then obtain a middle paint layer with a thickness of 7um. It can be understood that the middle paint layer is the expression layer of the color of the earphone decorative sheet, and the quality of the middle paint layer will affect the overall appearance quality of the earphone decorative sheet. By controlling the ratio of the second base oil and the second diluent, the middle paint can be sprayed more conveniently, and the effect of the middle paint layer obtained after spraying can be improved. By controlling the baking temperature and time, and UV energy, the quality of the middle paint layer after molding can be ensured. An overly thick middle paint layer is prone to sagging and has a high production cost. An overly thin middle paint layer will affect the overall appearance of the earphone decorative sheet and is prone to uneven paint surface. Selecting a middle paint layer with a thickness of 6um-8um can improve the appearance of the earphone decorative sheet and control the production cost.

[0081] Further, in step S07, the topcoat used in the topcoat spraying includes hard paint, soft paint and a third diluent, the mixing ratio is hard paint: soft paint: third diluent = 25:75:5, the topcoat viscosity is 8.2-8.8, the baking temperature is 55-60°C, the baking time is controlled at 8-10min, and the UV energy is controlled at 600-700j / cm 2 The thickness of the obtained topcoat layer is 15mm-17mm.

[0082] Preferably, the hard paint is the paint numbered ZD-3M394, the soft paint is the paint numbered ZD-3M390, the third diluent is the diluent numbered UV-X101, and the mixing ratio is ZD-3M394: ZD-3M390: UV-X101 = 25:75:5. The viscosity of the topcoat is 8.5, the baking temperature is 55°C, the baking time is controlled at 8 minutes, and the UV energy is controlled at 650 j / cm 2 , thereby obtaining a topcoat layer with a thickness of 16 mm.

[0083] It is understandable that the third diluent is mixed into the hard paint and the soft paint, and the third diluent plays a role in blending and facilitating the spraying of the topcoat, further ensuring the quality of the topcoat layer formed after spraying. The topcoat layer is a protective layer for the earphone decorative sheet. By controlling the mixing ratio of the hard paint, the soft paint and the third diluent, the hardness of the topcoat can be effectively improved, and the occurrence of the topcoat layer being bitten due to the excessive proportion of the third diluent can be avoided, further ensuring the quality of the topcoat layer, improving the appearance of the earphone decorative sheet, and at the same time improving the wear and corrosion resistance of the earphone decorative sheet.

[0084] In addition, the present invention also provides an earphone decorative sheet, which is made by the above-mentioned preparation method of the earphone decorative sheet.

[0085] In summary, the preparation method of the earphone decorative sheet and the earphone decorative sheet provided by the present invention use a glue drip molding process to make the surface of the prepared earphone decorative sheet present a concave shape, perform edge shaping treatment on the decorative sheet substrate, and then use the NCVM process to make the earphone decorative sheet obtain a transparent metallic texture, so that the earphone decorative sheet is not prone to erosion, wear or bumping and cracking, thereby improving the appearance effect and quality of the earphone decorative sheet.

[0086] Finally, it should be noted that the above description is illustrative of exemplary embodiments and should not be considered as limiting the exemplary embodiments. Although several exemplary embodiments have been described, it should be readily understood by those skilled in the art that a variety of modifications can be made in the exemplary embodiments without substantially departing from the new teachings and advantages of the exemplary embodiments. Accordingly, all such modifications are intended to be included within the scope of the exemplary embodiments defined in the claims. In the claims, means-plus-function clauses are intended to cover structures as described herein that perform the recited functions and structural equivalents and equivalent structures. Therefore, it should be understood that the above description is illustrative of exemplary embodiments and should not be considered to be limited to the specific exemplary embodiments disclosed, and it should be understood that modifications to the disclosed exemplary embodiments and other exemplary embodiments are intended to be included within the scope of the appended claims. The present invention is defined by the appended claims and the equivalents of the claims that should be included therein.

Claims

1. A method for preparing an earphone decorative sheet, characterized in that: The following steps are involved: A decorative sheet substrate with a concave middle portion is obtained by using PC material drip molding, and the decorative sheet substrate is subjected to film lamination treatment; Clamping the decorative sheet substrate and performing edge trimming treatment on the decorative sheet substrate; Pre-treating the decorative sheet substrate and spraying the decorative sheet substrate with a treatment agent so that the decorative sheet substrate is covered with a treatment agent paint layer with a thickness of 2um-4um; Spraying primer on the decorative sheet substrate so that the treatment agent paint layer is covered with a primer layer with a thickness of 15um-18um; The decorative sheet substrate is subjected to NCVM process treatment; the primer layer is covered with a coating layer having a thickness of 80-90 nm; The decorative sheet substrate is sprayed with intermediate paint, so that the coating layer is covered with an intermediate paint layer with a thickness of 6um-8um; Spraying the decorative sheet substrate with topcoat so that the intermediate paint layer is covered with a topcoat layer with a thickness of 13um-17um, and obtaining an earphone decorative sheet; The film pasting process specifically includes: A protective film is attached to the decorative sheet substrate, and ink is printed and baked; attaching an adsorption film on the protective film; The edge angle shaping process specifically includes: Performing CCD positioning punching on the decorative sheet substrate to obtain a plurality of positioning holes; According to the positioning holes, the decorative sheet substrate is CNC cut and formed; The decorative sheet substrate cut by CNC is deburred.

2. The method for preparing the earphone decorative sheet according to claim 1, characterized in that: The glue filling thickness of the middle part of the decorative sheet substrate with a concave middle part is not less than 0.05 mm.

3. The method for preparing the earphone decorative sheet according to claim 1, characterized in that: The treatment agent used in the treatment agent spraying is a first crude oil agent.

4. The method for preparing the earphone decorative sheet according to claim 1, characterized in that: The primer used in the primer spraying includes a thin coating agent, a thick coating agent and a first diluent, and the mixing ratio is thin coating agent: thick coating agent: first diluent = 100:30:

10.

5. The method for preparing the earphone decorative sheet according to claim 1, characterized in that: The intermediate paint used in the intermediate paint spraying includes a second base oil and a second diluent, and the mixing ratio is the second base oil: the second diluent = 100:

5.

6. The method for preparing the earphone decorative sheet according to claim 1, characterized in that: The topcoat used in the topcoat spraying includes hard paint, soft paint and a third diluent, and the mixing ratio is hard paint: soft paint: third diluent = 25:75:

5.

7. The method for preparing the earphone decorative sheet according to claim 1, characterized in that: The target material for electroplating during the NCVM process is pure indium.

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