Case assembly, method of making same, and terminal

Abstract

The application provides a shell assembly, comprising a woven glass fiber plate layer, a covering layer, an ink layer, an optical coating layer, a texture layer and a plastic substrate layer which are sequentially stacked; the thermal shrinkage rates of the woven glass fiber plate layer, the covering layer and the ink layer differ by no more than 20%; the thickness of the covering layer is no more than 0.2 mm; the thickness of the ink layer is no more than 0.1 mm; the total light transmittance of the covering layer and the ink layer is no more than 0.05%; the elongation of the plastic substrate layer is no less than 150%, and the tensile strength is no less than 45 MPa. The application also provides a preparation method of the shell assembly and a terminal comprising the same. The application takes the woven glass fiber plate as the support structure of the shell assembly, adopts the covering layer and the ink layer satisfying specific performance to cover the weaving texture of the woven glass fiber plate, so that the laminated structure with the glint effect presents a high-grade glint effect on the glass shell assembly.

Description

Technical Field

[0001] This application relates to the field of terminals, and in particular to housing components, their manufacturing methods, and terminals. Background Technology

[0002] Smartphones, tablets, and other electronic devices use fiberglass sheets as battery covers due to their high toughness and light weight, making them not only drop-resistant but also thinner and lighter. To achieve sufficient strength, fiberglass sheets are generally made of woven glass cloth. However, the woven texture of the glass cloth can easily transfer to the optical decorative layer during 3D molding, affecting the decorative effect and preventing the industry from achieving advanced decorative results. Summary of the Invention

[0003] The housing component, its preparation method, and the terminal provided in this application solve the problem that fiberglass panels cannot achieve advanced decorative effects when used as battery covers.

[0004] To achieve the above objectives, this application adopts the following technical solution:

[0005] The present invention provides a housing assembly comprising, in sequence, a woven fiberglass board layer, a cover layer, an ink layer, an optical coating layer, a texture layer, and a plastic substrate layer; wherein the thermal shrinkage rates of the woven fiberglass board layer, the cover layer, and the ink layer differ by no more than 20%; the thickness of the cover layer does not exceed 0.2 mm; the thickness of the ink layer does not exceed 0.1 mm; the total light transmittance of the cover layer and the ink layer does not exceed 0.05%; and the elongation of the plastic substrate layer is not less than 150%, and the tensile strength is not less than 45 MPa.

[0006] In one embodiment, the optical coating layer, texture layer, and plastic substrate layer can be successively combined with the woven fiberglass board layer, masking layer, ink layer, etc., to form a laminated structure; in another embodiment, the optical coating layer, texture layer, and plastic substrate layer can also form a decorative film, which is then combined with the woven fiberglass board layer, masking layer, ink layer, etc., in the form of an integral film to form a laminated structure; in other embodiments, the ink layer, optical coating layer, texture layer, and plastic substrate layer can form a decorative film, which is then combined with the woven fiberglass board layer and masking layer in the form of an integral film to form a laminated structure.

[0007] In this application, the laminated structure formed by the optical coating layer, texture layer, and plastic substrate layer has a dazzling effect similar to CD texture or laser texture. This application uses a woven fiberglass board as the supporting structure of the shell assembly. It employs a masking layer with a thermal shrinkage rate difference of no more than 20% and a thickness of no more than 0.2 mm, and an ink layer with a thermal shrinkage rate difference of no more than 20% and a thickness of no more than 0.1 mm, with the total light transmittance of the two layers not exceeding 0.05%, to cover the woven texture of the fiberglass board. This prevents the woven texture from being imprinted onto the decorative film during the heat forming process, thereby allowing the aforementioned laminated structure with a dazzling effect to present a high-end dazzling effect on the glass shell assembly.

[0008] In order to ensure the appearance of the shell components, the plastic substrate layer of the decorative film must meet the following performance parameters: the difference in heat shrinkage rate is no more than 20%, the thickness is less than or equal to 0.2 mm, and the light transmittance is less than or equal to 0.05%. In addition, its plastic properties must meet the requirements of elongation of not less than 150% and tensile strength of not less than 50 MPa. The purpose is to prevent cracks from occurring during 3D stretching.

[0009] In this application, the covering layer can be an adhesive layer, a covering resin layer, a filler layer, a unidirectional fiberglass board layer, etc. On the one hand, it has a similar thermal shrinkage rate to the woven fiberglass board layer, so that the woven texture will not be imprinted on the surface of the housing component during 3D hot pressing, affecting its appearance and other optical textures, such as the display of glare; on the other hand, it has a thinner thickness and lower light transmittance, which enhances the presentation of advanced optical effects such as glare.

[0010] In one embodiment of this application, a matte layer may also be formed on the plastic substrate layer, thereby giving the housing assembly both matte and glossy effects, enhancing the aesthetics of the housing assembly and the terminal.

[0011] On the other hand, this application provides a method for preparing the aforementioned housing assembly.

[0012] In one embodiment, the housing assembly is prepared by first 3D molding a woven fiberglass prepreg and then bonding it with other decorative layers:

[0013] The woven fiberglass cloth prepreg is 3D hot-pressed and then laminated with the cover layer and decorative layer in sequence for a second hot-pressing process to obtain the shell assembly.

[0014] The decorative layer includes an ink layer, an optical coating layer, a texture layer, and a plastic substrate layer stacked together, wherein the ink layer is in contact with the masking layer;

[0015] The difference in thermal shrinkage rates between the woven fiberglass board layer, the covering layer, and the ink layer does not exceed 20%;

[0016] The thickness of the covering layer does not exceed 0.2 mm;

[0017] The thickness of the ink layer does not exceed 0.1 mm;

[0018] The total light transmittance of the covering layer and the ink layer does not exceed 0.05%;

[0019] The elongation of the plastic substrate layer is not less than 150%, and the tensile strength is not less than 45 MPa.

[0020] In another embodiment, the housing assembly is prepared by pre-bonding the layers and then 3D molding the whole assembly:

[0021] The cover layer and the decorative layer are pre-bonded to obtain a pre-bonded layer;

[0022] The pre-bonding layer is bonded to the woven fiberglass cloth prepreg and then subjected to 3D hot pressing to obtain the shell assembly;

[0023] The decorative layer includes an ink layer, an optical coating layer, a texture layer, and a plastic substrate layer stacked together, wherein the ink layer is in contact with the masking layer;

[0024] The difference in thermal shrinkage rates between the woven fiberglass board layer, the covering layer, and the ink layer does not exceed 20%;

[0025] The thickness of the covering layer does not exceed 0.2 mm;

[0026] The thickness of the ink layer does not exceed 0.1 mm;

[0027] The total light transmittance of the covering layer and the ink layer does not exceed 0.05%;

[0028] The elongation of the plastic substrate layer is not less than 150%, and the tensile strength is not less than 45 MPa.

[0029] In another embodiment, the housing assembly is prepared according to the following method:

[0030] Woven fiberglass cloth is impregnated in thermoplastic resin and cured to obtain thermoplastic fiberglass board;

[0031] After the thermoplastic fiberglass board, the covering layer and the decorative layer are pre-bonded, they are subjected to planar hot pressing to obtain a planar laminated structure;

[0032] The planar laminated structure is softened and then subjected to 3D hot bending to obtain a shell assembly;

[0033] The decorative layer includes an ink layer, an optical coating layer, a texture layer, and a plastic substrate layer stacked together, wherein the ink layer is in contact with the masking layer;

[0034] The difference in thermal shrinkage rates between the woven fiberglass board layer, the covering layer, and the ink layer does not exceed 20%;

[0035] The thickness of the covering layer does not exceed 0.2 mm;

[0036] The thickness of the ink layer does not exceed 0.1 mm;

[0037] The total light transmittance of the covering layer and the ink layer does not exceed 0.05%;

[0038] The elongation of the plastic substrate layer is not less than 150%, and the tensile strength is not less than 45 MPa.

[0039] On the other hand, this application provides a terminal including the above-mentioned housing assembly, which uses the housing assembly as a battery cover or back cover and has advanced optical decorative effects such as matte and glossy finishes, making it more aesthetically pleasing.

[0040] It should be understood that the descriptions of technical features, technical solutions, beneficial effects, or similar language in this application do not imply that all features and advantages can be achieved in any single embodiment. Rather, it is understood that the description of a feature or beneficial effect means that a specific technical feature, technical solution, or beneficial effect is included in at least one embodiment. Therefore, the descriptions of technical features, technical solutions, or beneficial effects in this specification do not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions, and beneficial effects described in this embodiment can be combined in any suitable manner. Those skilled in the art will understand that embodiments can be implemented without one or more specific technical features, technical solutions, or beneficial effects of a particular embodiment. In other embodiments, additional technical features and beneficial effects may be identified in specific embodiments that do not embody all embodiments. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the terminal structure in one embodiment of this application;

[0042] Figure 2 This is a schematic diagram of the battery cover structure in the first embodiment of this application;

[0043] Figure 3 This is a flowchart of the first manufacturing process of the battery cover in the first embodiment of this application;

[0044] Figure 4 This is a flowchart of the second manufacturing process of the battery cover in the first embodiment of this application;

[0045] Figure 5 This is a flowchart of the third manufacturing process of the battery cover in the first embodiment of this application;

[0046] Figure 6This is a schematic diagram of the battery cover structure in the second embodiment of this application;

[0047] Figure 7 This is a schematic diagram of the battery cover structure in the third embodiment of this application. Detailed Implementation

[0048] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0049] The terminal mentioned in this application can be any device with communication and storage functions, such as smartphones, cellular phones, cordless phones, Session Initiation Protocol (SIP) phones, tablets, Personal Digital Assistants (PADs), laptops, digital cameras, e-book readers, portable multimedia players, handheld devices with wireless communication functions, computing devices or other processing devices connected to a wireless modem, in-vehicle devices, wearable devices, 5G terminal devices, etc. The embodiments of this application are not limited to this.

[0050] In the embodiments of this application, fiberglass board refers to woven fiberglass board, also known as woven fiberglass composite board, etc., which is formed by weaving fiberglass into fiberglass cloth according to warp and weft, and then reinforced with thermoplastic or thermosetting resin.

[0051] In the embodiments of this application, transmittance refers to the ability of light to pass through a medium, which affects the visual effect of the medium; thickness refers to the distance between the upper and lower surfaces of the medium. Those skilled in the art will understand that thickness affects transmittance. The transmittance mentioned in the embodiments of this application refers to the transmittance of the various layers of films in the field of mobile phone battery covers with a typical thickness. For example, to control the thickness of the mobile phone battery cover, the thickness of the adhesive layer generally does not exceed 0.2 mm, and the transmittance of the adhesive layer also refers to the transmittance when its thickness does not exceed 0.2 mm.

[0052] The heat shrinkage rate mentioned in this solution refers to the percentage difference in size between the film before and after heat treatment, including longitudinal heat shrinkage rate and transverse heat shrinkage rate. The longitudinal heat shrinkage rate and transverse heat shrinkage rate of woven fiberglass board are relatively consistent, and are described in this solution as heat shrinkage rate.

[0053] The optical texture described in this invention refers to the linear patterns exhibited by the laminated film under the influence of light, including matte and glossy effects. Matte refers to the laminated film having a fuzzy texture, similar to frosted glass; glossy refers to the laminated film having textures with different brightness and colors, displaying a texture effect similar to the reflection of a CD or a laser pattern.

[0054] In this invention, tensile strength and elongation are both performance parameters characterizing the plasticity of materials. Tensile strength, also known as tensile strength, refers to the maximum tensile stress that a specimen experiences until it breaks during a tensile test. Elongation is the percentage of the total deformation ΔL of the gauge length after the specimen breaks under tension to the original gauge length L: δ = ΔL / L × 100%.

[0055] This application uses a smartphone as an example to illustrate the terminal; see [link / reference]. Figure 1 , Figure 1 This is a schematic diagram of the structure of a terminal in one embodiment of this application. In one embodiment, the terminal 10 includes a middle frame 100, a display screen 200 and a battery cover 300. The middle frame 100 connects the display screen 200 and the battery cover 300 respectively and forms a receiving space. The motherboard, memory, power supply and other devices of the terminal 10 are disposed in the receiving space.

[0056] Fiberglass sheets possess excellent mechanical strength and are currently used in the fabrication of 3D mobile phone battery covers. However, during the fabrication process, the fiberglass sheets and other materials need to be heated above their softening temperature to allow deformation. Since the woven glass fibers inside the fiberglass sheet are inorganic and do not soften, the woven texture of the fiberglass sheet is easily imprinted during deformation, affecting the appearance of the battery cover. One solution achieves a matte texture by layering heat-sensitive adhesive, non-woven fabric, and polyurethane (PU) matte leather on the fiberglass sheet. However, this method results in a phone back cover with a ribbed structure, leading to issues such as edge shrinkage, low yield, and high processing costs. Another solution achieves a matte metallic texture by sequentially spraying primer, intermediate coat, color paint, and matte topcoat onto the fiberglass sheet. However, this method struggles to achieve a glossy effect. This solution addresses the aforementioned issues through a layered structure. On one hand, it conceals the woven texture of the fiberglass board, and on the other hand, it prevents the woven texture of the fiberglass board from being imprinted on other boards, thereby achieving a high-end textured effect for the battery cover, especially the dazzling effect.

[0057] See Figure 2 , Figure 2 This is a schematic diagram of the battery cover in the first embodiment of this application. In this embodiment, the battery cover 300 includes a woven glass fiber board layer 3201, an adhesive layer 3202, an ink layer 3203, an optical coating layer 3204, a texture layer 3205, and a plastic substrate layer 3206, which are stacked in sequence.

[0058] The woven fiberglass board layer 3201, as the main structure of the battery cover 300, possesses high mechanical strength and low surface roughness, primarily serving a supporting function. In one embodiment, the woven fiberglass board layer 3201 is obtained by laminating multiple layers of woven fiberglass cloth prepreg. The woven fiberglass cloth prepreg is obtained by coating and drying woven fiberglass cloth in a resin solution. The woven fiberglass cloth is made of woven glass fibers. The glass fibers include, but are not limited to, E-glass fibers, S-glass fibers, C-glass fibers, and A-glass fibers. In one embodiment, the resin solution includes a matrix resin, a curing agent, an accelerator, and a solvent. In one embodiment, the matrix resin is a thermosetting resin, including but not limited to bisphenol A epoxy resin, phenolic epoxy resin, alicyclic epoxy resin, nitrogen-containing multifunctional epoxy resin, phenolic resin, bismaleimide resin, and benzoxazine resin. In one embodiment, the curing agent may be selected from phenolic curing agents, acid anhydride curing agents, amine curing agents, or dicyandiamide curing agents, such as nadic anhydride, methylnadic anhydride, methyltetrahydrophthalic anhydride, diphenyl ether tetracarboxylic anhydride, benzophenone tetracarboxylic dianhydride, methyl-cyclohexene-tetracarboxylic dianhydride, diphenylbiphenyl diamine, and dicyandiamide. In one embodiment, the accelerator includes imidazole accelerators or amine accelerators, such as imidazole and 2-methylimidazole. In one embodiment, the thermosetting resin is a thermosetting epoxy resin, and the curing agent is an amine curing agent. In one embodiment, the resin liquid is a thermoplastic resin and a solvent, and the thermoplastic resin includes, but is not limited to, thermoplastic polyurethane, thermoplastic polyamide, thermoplastic polyetheretherketone, and thermoplastic polyphenylene sulfide.

[0059] Those skilled in the art will understand that "multilayer" in the embodiments of this application refers to at least two layers or more, such as two layers, three layers, four layers, etc. The thickness of each layer of woven fiberglass cloth prepreg is 0.003–0.12 mm, and the thickness of the woven fiberglass board layer 3001 is 0.05 mm–1 mm. For example, when the thickness of the woven fiberglass cloth prepreg is 0.1 mm, four layers are needed to prepare a 0.4 mm thick woven fiberglass board layer; while when the thickness of the woven fiberglass cloth prepreg is 0.01 mm, 20 layers are needed to prepare a 0.2 mm thick woven fiberglass board layer. In one embodiment, to balance the thickness of the battery cover 300 and its mechanical strength, the thickness of the woven fiberglass board layer is 0.1 mm–0.5 mm.

[0060] In one embodiment, the ink layer 3203, the optical coating layer 3204, the texture layer 3205, and the plastic substrate layer 3206 constitute a laminated structure of a decorative film with a dazzling effect.

[0061] The plastic substrate layer 3206 serves as both a printing substrate for the texture layer 3205 and a plastic substrate for applying various special effects, such as matte or glossy finishes. In one embodiment, the plastic substrate layer 3206 includes, but is not limited to, polycarbonate (PC), glass fiber reinforced polycarbonate, polyethylene terephthalate (PET), aramid fiber reinforced PET such as Kevlar-reinforced PET, polyvinyl chloride (PVC), thermoplastic polyurethane elastomer (TPU), and polycarbonate (PC) / thermoplastic polyurethane elastomer (TPU) composites. In one embodiment, the thickness of the plastic substrate layer 3206 is 0.01–0.15 mm. In another embodiment, the thickness of the plastic substrate layer 3206 is 0.05–0.13 mm.

[0062] In one embodiment, the elongation of the plastic substrate layer 3206 is not less than 150%, and the tensile strength is not less than 45 MPa. In another embodiment, the elongation of the plastic substrate layer 3206 is not less than 180%, and the tensile strength is not less than 50 MPa. In yet another embodiment, the elongation of the plastic substrate layer 3206 is not less than 200%, and the tensile strength is not less than 50 MPa. Plastic substrate layers meeting these conditions ensure that the obtained laminated structure does not produce any appearance defects during the fabrication of the 3D battery cover. If the tensile strength and elongation are lower than these conditions, the plastic substrate layer is prone to cracking during 3D hot bending of the 3D battery cover, affecting the appearance of the battery cover.

[0063] The texture layer 3205 and the optical coating layer 3204 can provide rich optical texture effects with light and shadow effects, realizing the diversification of the appearance decoration of the battery cover 300. In one embodiment, the texture layer 3205 and the optical coating layer 3204 can be obtained by: transferring the optical texture onto the plastic substrate layer 3206 by ultraviolet light curing (UV) to form a UV film (i.e., texture layer 3205), and then performing physical vapor deposition (PVD) coating on the UV film to form the optical coating layer 3204. In another embodiment, the texture layer 3205 and the optical coating layer 3204 can be obtained by: directly obtaining the optical texture on the plastic substrate layer 3206 by laser etching to form the texture layer 3205, and then performing PVD coating to form the optical coating layer 3204. In one embodiment, the optical texture can be a CD pattern, laser pattern, or other texture that can achieve a dazzling effect. In one embodiment, PVD coating can be performed using metal, metal oxide, or non-metal oxide as the target material through evaporation, magnetron sputtering, or ion plating to form an optical coating layer. To achieve the desired optical texture effect, those skilled in the art can choose a single target material for coating, or they can choose two or more different targets for coating; this application is not limited in this regard. In one embodiment, the metal target material includes, but is not limited to, aluminum, titanium, zirconium, chromium, niobium, etc.; the metal oxide target material includes, but is not limited to, titanium dioxide, etc.; and the non-metal oxide target material includes, but is not limited to, silicon dioxide, etc. In one embodiment, the thickness of the texture layer 3205 is 2–15 μm. In one embodiment, the thickness of the optical coating layer 3204 is 50–600 nm.

[0064] The ink layer 3203 serves as a protective layer for the optical coating layer 3204 and, together with the adhesive layer 3202, provides a shielding effect. In one embodiment, the thickness of the ink layer 3203 is 10–60 μm. In another embodiment, the thickness of the ink layer 3203 is 15–50 μm. In one embodiment, the ink layer 3203 can be a black ink layer, a white ink layer, or a gray ink layer, with a light transmittance of less than 0.05%. In another embodiment, the light transmittance of the ink layer 3203 is 0. The ink layer 3203 can be formed on the optical coating layer by methods such as screen printing, coating, or spraying.

[0065] In one embodiment, the total thickness of the ink layer 3203, the optical coating layer 3204, the texture layer 3205, and the plastic substrate layer 3206 is less than 0.15 mm.

[0066] This solution uses an adhesive layer 3202 and an ink layer 3203 to mask the fiber weave texture, and the display of the optical texture effect will not be affected after 3D hot pressing. In one embodiment, the thickness of the adhesive layer 3202 is less than 0.2 mm. In another embodiment, the thickness of the adhesive layer 3202 is less than 0.15 mm. In one embodiment, the light transmittance of the adhesive layer 3202 is less than 0.05%. In another embodiment, the light transmittance of the adhesive layer 3202 is 0. In yet another embodiment, the haze of the adhesive layer is less than 220.

[0067] In one embodiment, the adhesive layer 3202 may be a light-shielding tape, light-shielding adhesive, etc.

[0068] In one embodiment, the total light transmittance of the adhesive layer 3202 and the ink layer 3203 is less than 0.05%. In another embodiment, the total light transmittance of the adhesive layer 3202 and the ink layer 3203 is 0. In one embodiment, the difference between the thermal shrinkage rate of the adhesive layer 3202 and the ink layer 3203 and the thermal shrinkage rate of the woven fiberglass board layer 3201 does not exceed 20% of the thermal shrinkage rate of the woven fiberglass board layer 3201. For example, the thermal shrinkage rate of the woven fiberglass board layer 3201 is 0.2, and the thermal shrinkage rate of the adhesive layer 3202 and the ink layer 3203 is between 0.16 and 0.24. When the thermal shrinkage rates of the woven fiberglass board layer 3201 and the adhesive layer 3202 and the ink layer 3203 are kept within the above range, it can be ensured that the woven fiberglass board layer and the adhesive layer and ink layer deform uniformly when heated, thereby preventing the texture of the woven fiberglass from being imprinted on the adhesive layer and the ink layer, affecting the masking effect of the adhesive layer and the ink layer. In one embodiment, the difference between the heat shrinkage rate of the adhesive layer 3202 and the ink layer 3203 and the heat shrinkage rate of the braided fiberglass board layer 3201 does not exceed 15% of the heat shrinkage rate of the braided fiberglass board layer 3201. For example, the heat shrinkage rate of the braided fiberglass board layer 3201 is 0.2, and the heat shrinkage rate of the adhesive layer 3202 and the ink layer 3203 is between 0.16 and 0.23. In another embodiment, the difference between the heat shrinkage rate of the adhesive layer 3202 and the ink layer 3203 and the heat shrinkage rate of the braided fiberglass board layer 3201 does not exceed 10% of the heat shrinkage rate of the braided fiberglass board layer 3201. For example, the heat shrinkage rate of the braided fiberglass board layer 3201 is 0.2, and the heat shrinkage rate of the adhesive layer 3202 and the ink layer 3203 is between 0.18 and 0.28. In this solution, the total light transmittance of the adhesive layer 3202 and the ink layer 3203 is less than 0.05%, and the difference between the heat shrinkage rate of the adhesive layer 3202 and the ink layer 3203 and the heat shrinkage rate of the woven glass fiber board layer 3201 does not exceed 20% of the heat shrinkage rate of the woven glass fiber board layer 3201. This can cover the fiber weave texture and will not cause the fiber weave texture to be imprinted on the adhesive layer 3202 or even the ink layer 3203 during hot pressing, thus not affecting the display of optical textures such as glare.

[0069] It is understood that the heat shrinkage rate mentioned in this solution refers to the percentage difference in the size of the film before and after heat processing, including longitudinal heat shrinkage rate and transverse heat shrinkage rate. The longitudinal heat shrinkage rate and transverse heat shrinkage rate of woven fiberglass board are relatively consistent, and are described in this solution as heat shrinkage rate.

[0070] In one embodiment, the battery cover 300 further includes a matte layer 3207 disposed on the plastic substrate layer 3206, so that the battery cover 300 has both a glossy effect and a high-end matte effect. The matte layer 3207 can be obtained by applying a matte coating to the plastic substrate layer 3206 by means of curtain coating, spraying, or inkjet printing.

[0071] In one embodiment, ink layer 3203, optical coating layer 3204, texture layer 3205, plastic substrate layer 3206 and matte layer 3207 constitute a laminated structure of a decorative film that has both glossy and matte effects.

[0072] See Figure 3 , Figure 3 This is a flowchart illustrating a first manufacturing process of the battery cover in the first embodiment of this application. In one embodiment, the battery cover is manufactured according to the following steps:

[0073] Step S301: Coat the woven glass fiber cloth in a resin solution including epoxy resin and amine curing agent, and dry it to obtain a prepreg.

[0074] Three to four layers of prepreg are stacked in a 3D mold and hot-pressed at 120 to 200°C for 10 to 30 minutes to form a 3D fiberglass board.

[0075] Step S302: Under vacuum and at 40-80°C, the decorative film, adhesive and the 3D fiberglass board obtained in step S301 are laminated together, then placed in a pre-applied fixture, and hot-pressed for 30-60 seconds at 80-150°C, and then cold-pressed at room temperature at 0-1MPa for 20-100 seconds.

[0076] The decorative film comprises a stacked structure of an ink layer, an optical coating layer, a texture layer, and a plastic substrate layer, and has a dazzling effect with a film thickness of less than 0.15 mm.

[0077] The adhesive layer thickness is less than 0.2 mm;

[0078] Step S303: Perform individual unit and assembly tests on the CNC camera and the outer gate, with a total thickness of less than 0.6mm.

[0079] In the above embodiments, the prepreg, adhesive layer, ink layer, optical coating layer, texture layer and plastic substrate layer meet the performance parameters described above, and will not be repeated here.

[0080] In one embodiment, the process between step S302 and step S303 further includes:

[0081] Step S302a: Spray a UV matte coating onto the plastic substrate layer, with a film thickness of 15-22 μm and an energy of 800-1000 mJ / cm. 2 .

[0082] In one embodiment, in step S302, the decorative film comprises a stacked structure of an ink layer, an optical coating layer, a texture layer, a plastic substrate layer, and a matte layer, which simultaneously possesses both glossy and matte effects, and the film thickness is less than 0.15 mm. In this case, a battery cover with a matte effect can be obtained without performing step S302a.

[0083] See Figure 4 , Figure 4 This is a flowchart illustrating a second manufacturing process for the battery cover in the first embodiment of this application. In one embodiment, the battery cover is manufactured according to the following steps:

[0084] Step S401: Coat the woven glass fiber cloth in a resin solution including epoxy resin and amine curing agent, and dry it to obtain a prepreg.

[0085] Under vacuum and at 40–80°C, the decorative film and adhesive are pre-bonded to obtain a pre-bonded layer;

[0086] Step S402: The pre-bonding layer and 3 to 4 layers of prepreg are stacked in a 3D mold and hot-pressed at 120 to 200°C for 10 to 30 minutes under a pressure of 2 to 15 MPa, and then cold-pressed at room temperature for 8 to 20 minutes.

[0087] The decorative film comprises a stacked structure of an ink layer, an optical coating layer, a texture layer, and a plastic substrate layer, and has a dazzling effect with a film thickness of less than 0.15 mm.

[0088] The adhesive layer thickness is less than 0.2 mm;

[0089] Step S403: Perform individual unit and assembly tests on the CNC camera and the outer gate, with a total thickness of less than 0.6mm.

[0090] Compared with the first preparation method, which involves 3D pre-forming and then thermally bonding the decorative film, the second preparation method involves pre-bonding the decorative film and adhesive, and then stacking it with the prepreg to form a whole 3D shape. This avoids the problem of loose bonding at the edges and corners of the 3D pattern, and is more conducive to the display of the 3D effect.

[0091] In the above embodiments, the prepreg, adhesive layer, ink layer, optical coating layer, texture layer and plastic substrate layer meet the performance parameters described above, and will not be repeated here.

[0092] In one embodiment, the process between step S402 and step S403 further includes:

[0093] Step S402a: Spray a UV matte coating onto the plastic substrate layer, with a film thickness of 15–22 μm and an energy of 800–1000 mJ / cm. 2 .

[0094] In one embodiment, in step S402, the decorative film includes a stacked structure of an ink layer, an optical coating layer, a texture layer, a plastic substrate layer, and a matte layer, possessing both a glossy and matte effect, and a film thickness of less than 0.15 mm. In this case, a battery cover with a matte effect can be obtained without performing step S402a.

[0095] See Figure 5 , Figure 5 This is a flowchart illustrating a third manufacturing process for the battery cover in the first embodiment of this application. In one embodiment, the battery cover is manufactured according to the following steps:

[0096] Step S501: Coat the woven glass fiber cloth in a thermoplastic resin liquid, dry it to obtain a thermoplastic resin prepreg, and cure the thermoplastic resin prepreg at 150-180℃ to obtain a thermoplastic resin glass fiber board.

[0097] Step S502: After the decorative film, adhesive, and thermoplastic resin fiberglass board are bonded together, they are hot-pressed at 80-150℃ for 30-60s under vacuum conditions to obtain a planar laminated structure. Then, the structure is softened in a 3D mold at 180-200℃ for 10-30min and 3D hot-bending is performed.

[0098] The decorative film comprises a stacked structure of an ink layer, an optical coating layer, a texture layer, and a plastic substrate layer, and has a dazzling effect with a film thickness of less than 0.15 mm.

[0099] The adhesive layer thickness is less than 0.2 mm;

[0100] Step S503: Perform individual unit and assembly tests on the CNC camera and the outer sprue position, with a total thickness of less than 0.6mm.

[0101] Compared with the first and second preparation processes, the third preparation process differs in that it uses thermoplastic resin to prepare woven glass fiber boards, which is more conducive to the processing of 3D patterns.

[0102] In the above embodiments, the prepreg, adhesive layer, ink layer, optical coating layer, texture layer, and plastic substrate layer meet the performance parameters described above, and will not be repeated here. Furthermore, in this embodiment, the resins used in the adhesive layer, ink layer, optical coating layer, texture layer, and plastic substrate layer are all thermoplastic resins to meet the process requirements of first forming a planar laminated structure through low-temperature hot pressing, and then softening and 3D hot bending at high temperature.

[0103] In one embodiment, the process further includes the following step between step S502 and step S503:

[0104] Step S502a: Spray a UV matte coating onto the plastic substrate layer, with a film thickness of 15-22 μm and an energy of 800-1000 mJ / cm.2 .

[0105] In one embodiment, in step S502, the decorative film includes a stacked structure of an ink layer, an optical coating layer, a texture layer, a plastic substrate layer, and a matte layer, possessing both a glossy and matte effect, and a film thickness of less than 0.15 mm. In this case, a battery cover with a matte effect can be obtained without performing step S502a.

[0106] See Figure 6 , Figure 6 This is a schematic diagram of the battery cover structure in the second embodiment of this application. In this embodiment, the battery cover 300 includes a woven fiberglass board layer 3601, a filler layer 3602, an ink layer 3603, an optical coating layer 3604, a texture layer 3605, and a plastic substrate layer 3606, which are stacked sequentially. The performance parameters of the woven fiberglass board layer 3601, the ink layer 3603, the optical coating layer 3604, the texture layer 3605, and the plastic substrate layer 3606 are the same as described above, and will not be repeated here.

[0107] The ink layer 3603 serves as a protective layer for the optical coating layer 3604 and, together with the filler layer 3602, provides a shielding effect. In one embodiment, the thickness of the ink layer 3603 is 10–60 μm. In another embodiment, the thickness of the ink layer 3603 is 15–50 μm. In one embodiment, the ink layer 3603 can be a black ink layer, a white ink layer, or a gray ink layer, with a light transmittance of less than 0.05%. In another embodiment, the light transmittance of the ink layer 3603 is 0. The ink layer 3603 can be formed on the optical coating layer 3604 by methods such as screen printing, coating, or spraying.

[0108] In one embodiment, the total thickness of the ink layer 3603, the optical coating layer 3604, the texture layer 3605, and the plastic substrate layer 3606 is less than 0.15 mm.

[0109] This solution uses a filler layer 3602 and an ink layer 3603 to mask the fiber weave texture, and the display of the optical texture effect will not be affected after 3D hot pressing. In one embodiment, the thickness of the filler layer 3602 is less than 0.2 mm. In another embodiment, the thickness of the filler layer 3602 is less than 0.15 mm. In one embodiment, the light transmittance of the filler layer 3602 is less than 0.05%. In yet another embodiment, the light transmittance of the filler layer 3602 is 0.

[0110] In one embodiment, the filler layer 3602 is formed of filler, solvent, and film-forming resin, wherein the filler includes, but is not limited to, white fillers such as titanium dioxide, and black fillers such as silica and talc. The filler layer 3602 can be formed on the ink layer 3603, or on the woven fiberglass board layer 3601, or directly disposed between the ink layer 3603 and the woven fiberglass board layer 3601 by hot pressing to form a laminated structure.

[0111] In one embodiment, the total light transmittance of the filler layer 3602 and the ink layer 3603 is less than 0.05%. In one embodiment, the total light transmittance of the filler layer 3602 and the ink layer 3603 is 0. In one embodiment, the difference between the heat shrinkage rate of the filler layer 3602 and the ink layer 3603 and the heat shrinkage rate of the woven fiberglass board layer 3601 does not exceed 20% of the heat shrinkage rate of the woven fiberglass board layer 3601. In one embodiment, the difference between the heat shrinkage rate of the filler layer 3602 and the ink layer 3603 and the heat shrinkage rate of the woven fiberglass board layer 3601 does not exceed 15% of the heat shrinkage rate of the woven fiberglass board layer 3601. In one embodiment, the difference between the heat shrinkage rate of the filler layer 3602 and the ink layer 3603 and the heat shrinkage rate of the woven fiberglass board layer 3601 does not exceed 10% of the heat shrinkage rate of the woven fiberglass board layer 3601. In this solution, the total light transmittance of the filler layer 3602 and the ink layer 3603 is less than 0.05%, and the difference between the heat shrinkage rate of the filler layer 3602 and the ink layer 3603 and the heat shrinkage rate of the woven glass fiber board layer 3601 does not exceed 20% of the heat shrinkage rate of the woven glass fiber board layer 3601. This can cover the fiber weave texture and will not cause the fiber weave texture to form on the filler layer 3602 or even the ink layer 3603 during hot pressing, thus not affecting the display of optical textures such as glare.

[0112] In one embodiment, the filler layer 3602 can also be replaced by a covering resin layer. It is understood that the difference between the covering resin layer and the filler layer 3602 is that the filler layer mainly plays the role of covering, and the role of the resin is to form a film; the covering resin layer does not contain filler, and the resin mainly plays the role of covering, such as a macromolecular resin with high covering ability. The requirements for the thickness, light transmittance and heat shrinkage rate of the covering resin layer are the same as those for the filler layer.

[0113] In one embodiment, the battery cover 300 further includes a matte layer 3607 disposed on the plastic substrate layer 3606, so that the battery cover 300 has both a glossy effect and a high-end matte effect. The matte layer 3607 can be obtained by applying a matte coating to the plastic substrate layer 3606 by means of curtain coating, spraying, or inkjet printing.

[0114] In one embodiment, the ink layer 3603, the optical coating layer 3604, the texture layer 3605, the plastic substrate layer 3606, and the matte layer 3607 constitute a laminated structure of a decorative film that has both glossy and matte effects.

[0115] In one embodiment, the battery cover 300 further includes an adhesive layer (not shown in the figures), which may be disposed between the ink layer 3603 and the filler layer 3602, or between the woven fiberglass board 3601 and the filler layer 3602, for the purpose of adhesion. In one embodiment, the difference between the heat shrinkage rate of the adhesive layer and the heat shrinkage rate of the woven fiberglass board layer 3601 does not exceed 20% of the heat shrinkage rate of the woven fiberglass board layer 3601. In one embodiment, the difference between the heat shrinkage rate of the adhesive layer and the heat shrinkage rate of the woven fiberglass board layer 3601 does not exceed 15% of the heat shrinkage rate of the woven fiberglass board layer 3601. In one embodiment, the difference between the heat shrinkage rate of the adhesive layer and the heat shrinkage rate of the woven fiberglass board layer 3601 does not exceed 10% of the heat shrinkage rate of the woven fiberglass board layer 3601. It is understood that this embodiment does not limit the opacity, i.e., the light transmittance, of the adhesive layer when the filler layer 3602 and the ink layer 3603 have sufficient opacity; in one embodiment, the adhesive layer may also have opacity with a transmittance of less than 50%. In one embodiment, the total thickness of the filler layer 3502 and the adhesive layer is less than 0.2 mm.

[0116] The battery cover described above can be prepared using the three methods mentioned above, and will not be repeated here.

[0117] See Figure 7 , Figure 7 This is a schematic diagram of the battery cover structure in the third embodiment of this application. In this embodiment, the battery cover 300 includes a woven fiberglass board layer 3701, a unidirectionally arranged fiberglass board layer 3702, an ink layer 3703, an optical coating layer 3704, a texture layer 3705, and a plastic substrate layer 3706, which are stacked sequentially. The performance parameters of the woven fiberglass board layer 3701, the ink layer 3703, the optical coating layer 3704, the texture layer 3705, and the plastic substrate layer 3706 are the same as described above, and will not be repeated here.

[0118] The ink layer 3703 serves as a protective layer for the optical coating layer 3704 and, together with the unidirectionally aligned glass fiber plate layer 3702, provides a shielding function. In one embodiment, the thickness of the ink layer 3703 is 10–60 μm. In another embodiment, the thickness of the ink layer 3703 is 15–50 μm. In one embodiment, the ink layer 3703 can be a black ink layer, a white ink layer, or a gray ink layer, with a light transmittance of less than 0.05%. In another embodiment, the light transmittance of the ink layer 3703 is 0. The ink layer 3703 can be formed on the optical coating layer 3704 by methods such as screen printing, coating, or spraying.

[0119] In one embodiment, the total thickness of the ink layer 3703, the optical coating layer 3704, the texture layer 3705, and the plastic substrate layer 3706 is less than 0.15 mm.

[0120] This solution uses a unidirectionally aligned glass fiber board layer 3702 and an ink layer 3703 to mask the fiber weave texture, ensuring that the optical texture effect is not affected after 3D hot pressing. The unidirectionally aligned glass fiber board layer 3702 is a board made of unidirectionally aligned glass fibers, including but not limited to E-glass fiber, S-glass fiber, C-glass fiber, A-glass fiber, and A3 steel, etc., and its material can be the same as or different from the glass material of the woven glass fiber board layer 3701. In one embodiment, the resin liquid includes a matrix resin, a curing agent, an accelerator, and a solvent. In one embodiment, the matrix resin is a thermosetting resin, including but not limited to bisphenol A epoxy resin, phenolic epoxy resin, alicyclic epoxy resin, nitrogen-containing multifunctional epoxy resin, phenolic resin, bismaleimide resin, benzoxazine resin, etc. In one embodiment, the curing agent may be selected from phenolic curing agents, acid anhydride curing agents, amine curing agents, or dicyandiamide curing agents, such as nadic anhydride, methylnadic anhydride, methyltetrahydrophthalic anhydride, diphenyl ether tetracarboxylic anhydride, benzophenone tetracarboxylic dianhydride, methyl-cyclohexene-tetracarboxylic dianhydride, diphenylbiphenyl diamine, and dicyandiamide. In one embodiment, the accelerator includes imidazole accelerators or amine accelerators, such as imidazole and 2-methylimidazole. In one embodiment, the thermosetting resin is a thermosetting epoxy resin, and the curing agent is an amine curing agent. In one embodiment, the resin liquid is a thermoplastic resin and a solvent, and the thermoplastic resin includes, but is not limited to, thermoplastic polyurethane and thermoplastic polyamide.

[0121] In one embodiment, the thickness of the unidirectional fiberglass board layer 3702 is less than 0.2 mm. In one embodiment, the thickness of the unidirectional fiberglass board layer 3702 is less than 0.15 mm. In one embodiment, the light transmittance of the unidirectional fiberglass board layer 3702 is less than 0.05%. In one embodiment, the light transmittance of the unidirectional fiberglass board layer 3702 is 0.

[0122] In one embodiment, the total light transmittance of the unidirectional fiberglass layer 3702 and the ink layer 3703 is less than 0.05%. In one embodiment, the total light transmittance of the unidirectional fiberglass layer 3702 and the ink layer 3703 is 0. In one embodiment, the difference between the thermal shrinkage rate of the unidirectional fiberglass layer 3702 and the ink layer 3703 and the thermal shrinkage rate of the braided fiberglass layer 3701 does not exceed 20% of the thermal shrinkage rate of the braided fiberglass layer 3701. In one embodiment, the difference between the thermal shrinkage rate of the unidirectional fiberglass layer 3702 and the ink layer 3703 and the thermal shrinkage rate of the braided fiberglass layer 3701 does not exceed 15% of the thermal shrinkage rate of the braided fiberglass layer 3701. In one embodiment, the difference between the thermal shrinkage rate of the unidirectional fiberglass layer 3702 and the ink layer 3703 and the thermal shrinkage rate of the braided fiberglass layer 3701 does not exceed 10% of the thermal shrinkage rate of the braided fiberglass layer 3701. In this solution, the total light transmittance of the unidirectionally arranged glass fiber board layer 3702 and the ink layer 3703 is less than 0.05%, and the difference between the thermal shrinkage rate of the unidirectionally arranged glass fiber board layer 3702 and the thermal shrinkage rate of the woven glass fiber board layer 3701 and the thermal shrinkage rate of the woven glass fiber board layer 3701 does not exceed 20% of the thermal shrinkage rate of the woven glass fiber board layer 3701. This can cover the fiber weave texture and will not cause the formation of fiber weave texture on the ink layer 3703 during hot pressing, thus not affecting the display of optical textures such as glare.

[0123] In one embodiment, the battery cover 300 further includes a matte layer 3707 disposed on the plastic substrate layer 3706, so that the battery cover 300 has both a glossy effect and a high-end matte effect. The matte layer 3707 can be obtained by applying a matte coating to the plastic substrate layer 3706 by means of dip coating, spraying, or inkjet printing.

[0124] In one embodiment, ink layer 3703, optical coating layer 3704, texture layer 3705, plastic substrate layer 3706 and matte layer 3707 constitute a laminated structure of a decorative film that has both glossy and matte effects.

[0125] In one embodiment, the battery cover 300 further includes an adhesive layer (not shown in the figures) disposed between the ink layer 3703 and the unidirectional fiberglass board layer 3702 for adhesive bonding. In one embodiment, the difference between the heat shrinkage rate of the adhesive layer and the heat shrinkage rate of the woven fiberglass board layer 3701 does not exceed 20% of the heat shrinkage rate of the woven fiberglass board layer 3701. In another embodiment, the difference between the heat shrinkage rate of the adhesive layer and the heat shrinkage rate of the woven fiberglass board layer 3701 does not exceed 15% of the heat shrinkage rate of the woven fiberglass board layer 3701. In yet another embodiment, the difference between the heat shrinkage rate of the adhesive layer and the heat shrinkage rate of the woven fiberglass board layer 3701 does not exceed 10% of the heat shrinkage rate of the woven fiberglass board layer 3701. It is understood that the opacity, i.e., the light transmittance, of the adhesive layer is not limited in this embodiment when the unidirectional fiberglass board layer 3702 and the ink layer 3703 have sufficient opacity; in one embodiment, the adhesive layer may also have opacity with a transmittance of less than 50%. In one embodiment, the total thickness of the unidirectionally aligned fiberglass board layer 3602 and the adhesive layer is less than 0.2 mm.

[0126] The battery cover described above can be prepared using the three methods mentioned above, and will not be repeated here.

[0127] After assembling the 3D battery cover provided by this invention with components such as a display screen, mid-frame, motherboard, memory, and power supply, a mobile phone terminal can be obtained. When the user uses the mobile phone terminal, the battery cover, being a glass plate structure with a shimmering layer, exhibits a shimmering effect similar to CD or laser textures, without displaying or being affected by woven textures, resulting in richer optical effects on the phone's back cover. Furthermore, when the battery cover includes a matte layer, it has a frosted surface effect, without displaying the woven texture of woven fiberglass, making the phone more aesthetically pleasing.

[0128] The 3D mobile phone battery cover provided in this application will be further described below with reference to the embodiments.

[0129] Example 1

[0130] A decorative film is provided, comprising a PC substrate layer, a UV film transferred onto the PC substrate layer, an optical coating layer formed on the UV film by PVD coating, and an ink layer sprayed onto the optical coating layer, wherein the PC substrate layer has a thickness of 0.1 mm, a tensile strength of 50 MPa, and an elongation of 180%; the UV film has a thickness of 10 μm, the optical coating layer has a thickness of 500 nm, and the ink layer has a thickness of 50 μm;

[0131] The woven fiberglass cloth is coated in a resin liquid containing epoxy resin and amine curing agent, and after drying, a 0.1 mm thick prepreg is obtained. Four layers of woven fiberglass cloth prepreg are stacked in a 3D mold, cut, and then hot-pressed at 180°C for 20 min. Then, it is cold-pressed at room temperature with a pressure of 0.5 MPa for 60 s to form a 3D fiberglass board.

[0132] Under vacuum and at 60°C, the decorative film, adhesive and 3D fiberglass board are laminated together, then placed in a pre-applied fixture, and hot-pressed for 40 seconds at 120°C, and then cold-pressed at room temperature under a pressure of 0.5MPa for 60 seconds.

[0133] On the obtained stacked structure, CNC machined the epitaxial gate position, designed a fixture, and performed matte spraying to form a matte layer with a thickness of 20μm, resulting in a 3D battery cover with both glossy and matte effects.

[0134] In the above-mentioned laminated structure, the thermal shrinkage rates of the PC substrate layer, adhesive layer, and fiberglass board layer of the decorative film do not differ by more than 20%.

[0135] After assembling the 3D battery cover provided in this embodiment with components such as a display screen, mid-frame, motherboard, memory, and power supply, a mobile phone terminal can be obtained. When the user uses the mobile phone terminal, its battery cover has a glass plate structure with a matte effect and a dazzling effect similar to CD texture or laser texture. It does not present the woven texture of woven glass fiber board, nor is it affected by the woven texture, and the optical effect is relatively rich.

[0136] Example 2

[0137] The difference from Example 1 is that the decorative film includes a matte layer coated on the other side of the PC substrate layer, with a thickness of 20 μm, and there is no need to spray the matte layer again subsequently.

[0138] Example 3

[0139] The difference from Example 1 is that the woven fiberglass cloth is coated in thermoplastic resin liquid and dried to obtain a 0.1 mm thick prepreg. Four layers of woven fiberglass cloth prepreg are stacked, cut, and cured at 160°C for 20 min to obtain a fiberglass board. The decorative film, adhesive and fiberglass board are laminated under vacuum at 60°C, and then placed in a pre-applied fixture and hot-pressed at 120°C for 40 s to obtain a planar laminated structure.

[0140] The CNC-generated laminated structure is then softened at 190°C for 20 minutes in a 3D mold and hot-bent to obtain the 3D laminated structure.

[0141] On the obtained 3D stacked structure, CNC machined the epitaxial gate position, designed a fixture, and sprayed a matte finish to form a matte layer with a thickness of 20μm, resulting in a 3D battery cover with dazzling and high-gloss effects.

[0142] In the above-mentioned laminated structure, the thermal shrinkage rates of the PC substrate layer, adhesive layer, and fiberglass board layer of the decorative film do not differ by more than 20%.

[0143] Example 4

[0144] The difference from Example 3 is that the adhesive is replaced with a masking resin to form a masking resin layer, which further increases the masking force. The thickness of the masking resin layer is 0.1 mm.

[0145] Under vacuum and at 60°C, the decorative film and the covering resin are pre-laminated, and then stacked with 4 layers of prepreg in a 3D mold. The temperature is raised to 180°C at a rate of 25°C / min, and 3D hot pressing is performed at 2MPa for 15 minutes. Then, the 3D laminated structure is obtained by cold pressing at room temperature for 10 minutes.

[0146] On the obtained 3D stacked structure, CNC machined the epitaxial gate position, designed a fixture, and sprayed a matte finish to form a matte layer with a thickness of 20μm, resulting in a 3D battery cover with dazzling and high-gloss effects.

[0147] In the above-mentioned laminated structure, the thermal shrinkage rates of the PC substrate layer, the covering resin layer, and the fiberglass board layer of the decorative film do not differ by more than 20%.

[0148] Example 5

[0149] The difference from Example 1 is that a structure formed by one layer of unidirectionally arranged glass fiber cloth is used instead of one layer of prepreg. The structure formed by unidirectionally arranged glass fiber cloth is obtained by coating the unidirectionally arranged glass fiber cloth in a resin liquid including epoxy resin and amine curing agent, and then drying it.

[0150] After assembling the 3D battery cover provided in this embodiment with components such as a display screen, mid-frame, motherboard, memory, and power supply, a mobile phone terminal can be obtained. When the user uses the mobile phone terminal, its battery cover has a glass plate structure with a matte effect and a dazzling effect similar to CD texture or laser texture. It does not present the woven texture of woven glass fiber board, nor is it affected by the woven texture, and the optical effect is relatively rich.

[0151] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A housing assembly comprising a woven fiberglass board layer, a cover layer, an ink layer, an optical coating layer, a textured layer, and a plastic substrate layer stacked together; The difference in thermal shrinkage rates between the woven fiberglass board layer and the covering layer does not exceed 20%, and the difference in thermal shrinkage rates between the woven fiberglass board layer and the ink layer does not exceed 20%. The thickness of the covering layer does not exceed 0.2 mm; The thickness of the ink layer does not exceed 0.1 mm; The total light transmittance of the covering layer and the ink layer does not exceed 0.05%; The elongation of the plastic substrate layer is not less than 150%, and the tensile strength is not less than 45 MPa; The housing assembly is formed by 3D hot pressing or 3D hot bending.

2. A housing assembly comprising a woven fiberglass board layer, a covering layer, and a decorative layer stacked together; wherein, The decorative layer includes an ink layer, an optical coating layer, a texture layer, and a plastic substrate layer stacked together, wherein the ink layer is in contact with the masking layer; The difference in thermal shrinkage rates between the woven fiberglass board layer and the covering layer does not exceed 20%, and the difference in thermal shrinkage rates between the woven fiberglass board layer and the ink layer does not exceed 20%. The thickness of the covering layer does not exceed 0.2 mm; The thickness of the ink layer does not exceed 0.1 mm; The total light transmittance of the covering layer and the ink layer does not exceed 0.05%; The elongation of the plastic substrate layer is not less than 150%, and the tensile strength is not less than 45 MPa; The housing assembly is formed by 3D hot pressing or 3D hot bending.

3. A housing assembly comprising a woven fiberglass board layer, a covering layer, an ink layer, and a decorative layer stacked together; wherein, The decorative layer includes an optical coating layer, a texture layer, and a plastic substrate layer stacked together, wherein the optical coating layer is in contact with the ink layer; The difference in thermal shrinkage rates between the woven fiberglass board layer and the covering layer does not exceed 20%, and the difference in thermal shrinkage rates between the woven fiberglass board layer and the ink layer does not exceed 20%. The thickness of the covering layer does not exceed 0.2 mm; The thickness of the ink layer does not exceed 0.1 mm; The total light transmittance of the covering layer and the ink layer does not exceed 0.05%; The elongation of the plastic substrate layer is not less than 150%, and the tensile strength is not less than 45 MPa; The housing assembly is formed by 3D hot pressing or 3D hot bending.

4. The housing assembly according to claim 2 or 3, characterized in that, The decorative layer also includes a matte layer disposed on the plastic substrate layer.

5. The housing assembly according to claim 1, characterized in that, It also includes a matte layer disposed on the plastic substrate layer.

6. The housing assembly according to any one of claims 1 to 5, characterized in that, The covering layer is an adhesive layer; The thickness of the adhesive layer shall not exceed 0.15 mm; The difference in thermal shrinkage rates between the woven fiberglass board layer and the adhesive layer does not exceed 20%, and the difference in thermal shrinkage rates between the woven fiberglass board layer and the ink layer does not exceed 15%.

7. The housing assembly according to any one of claims 1 to 5, characterized in that, The covering layer is a filler layer; The thickness of the filler layer does not exceed 0.15 mm; The difference in thermal shrinkage rates between the woven fiberglass board layer and the filler layer does not exceed 20%, and the difference in thermal shrinkage rates between the woven fiberglass board layer and the ink layer does not exceed 15%.

8. The housing assembly according to claim 7, characterized in that, It also includes an adhesive layer disposed between the filler layer and the ink layer.

9. The housing assembly according to claim 8, characterized in that, The total thickness of the filler layer and the adhesive layer shall not exceed 0.15 mm; The difference in thermal shrinkage rates between the woven fiberglass board layer and the filler layer does not exceed 20%, the difference in thermal shrinkage rates between the woven fiberglass board layer and the adhesive layer does not exceed 20%, and the difference in thermal shrinkage rates between the woven fiberglass board layer and the ink layer does not exceed 15%.

10. The housing assembly according to any one of claims 1 to 5, characterized in that, The covering layer is a covering resin layer; The thickness of the covering resin layer shall not exceed 0.15 mm; The difference in thermal shrinkage rates between the woven fiberglass board layer and the covering resin layer does not exceed 20%, and the difference in thermal shrinkage rates between the woven fiberglass board layer and the ink layer does not exceed 15%.

11. The housing assembly according to any one of claims 1 to 5, characterized in that, The covering layer is a unidirectionally arranged fiberglass board layer.

12. The housing assembly according to claim 11, characterized in that, It also includes an adhesive layer disposed between the masking layer and the ink layer; The light transmittance of the adhesive layer does not exceed 0.05%; The thickness of the adhesive layer shall not exceed 0.15 mm; The difference in thermal shrinkage rates between the woven glass fiber board layer and the unidirectional glass fiber board layer does not exceed 20%, the difference in thermal shrinkage rates between the woven glass fiber board layer and the adhesive layer does not exceed 20%, and the difference in thermal shrinkage rates between the woven glass fiber board layer and the ink layer does not exceed 15%.

13. The housing assembly according to any one of claims 1 to 12, characterized in that, The housing assembly is a battery cover for a smart terminal.

14. A method for preparing a housing assembly, comprising the following steps: The woven fiberglass cloth prepreg is 3D hot-pressed and then laminated with the cover layer and decorative layer in sequence for a second hot-pressing process to obtain a shell assembly including the woven fiberglass board layer, cover layer and decorative layer stacked together. The decorative layer includes an ink layer, an optical coating layer, a texture layer, and a plastic substrate layer stacked together, wherein the ink layer is in contact with the masking layer; The difference in thermal shrinkage rates between the woven fiberglass board layer and the covering layer does not exceed 20%, and the difference in thermal shrinkage rates between the woven fiberglass board layer and the ink layer does not exceed 20%. The thickness of the covering layer does not exceed 0.2 mm; The thickness of the ink layer does not exceed 0.1 mm; The total light transmittance of the covering layer and the ink layer does not exceed 0.05%; The elongation of the plastic substrate layer is not less than 150%, and the tensile strength is not less than 45 MPa.

15. A method for preparing a housing assembly, comprising the following steps: The cover layer and the decorative layer are pre-bonded to obtain a pre-bonded layer; After the pre-bonding layer is bonded to the woven fiberglass cloth prepreg, it is 3D hot-pressed to obtain a shell assembly including a woven fiberglass board layer, a cover layer and a decorative layer stacked together. The decorative layer includes an ink layer, an optical coating layer, a texture layer, and a plastic substrate layer stacked together, wherein the ink layer is in contact with the masking layer; The difference in thermal shrinkage rates between the woven fiberglass board layer and the covering layer does not exceed 20%, and the difference in thermal shrinkage rates between the woven fiberglass board layer and the ink layer does not exceed 20%. The thickness of the covering layer does not exceed 0.2 mm; The thickness of the ink layer does not exceed 0.1 mm; The total light transmittance of the covering layer and the ink layer does not exceed 0.05%; The elongation of the plastic substrate layer is not less than 150%, and the tensile strength is not less than 45 MPa.

16. A method for preparing a housing assembly, comprising the following steps: Woven fiberglass cloth is impregnated in thermoplastic resin and cured to obtain thermoplastic fiberglass board; After the thermoplastic fiberglass board, the covering layer and the decorative layer are pre-bonded, they are subjected to planar hot pressing to obtain a planar laminated structure; After softening the planar laminated structure, it is subjected to 3D hot bending to obtain a shell assembly including a woven glass fiber board layer, a cover layer and a decorative layer stacked together. The decorative layer includes an ink layer, an optical coating layer, a texture layer, and a plastic substrate layer stacked together, wherein the ink layer is in contact with the masking layer; The difference in thermal shrinkage rates between the woven fiberglass board layer and the covering layer does not exceed 20%, and the difference in thermal shrinkage rates between the woven fiberglass board layer and the ink layer does not exceed 20%. The thickness of the covering layer does not exceed 0.2 mm; The thickness of the ink layer does not exceed 0.1 mm; The total light transmittance of the covering layer and the ink layer does not exceed 0.05%; The elongation of the plastic substrate layer is not less than 150%, and the tensile strength is not less than 45 MPa.

17. The method according to any one of claims 14 to 16, characterized in that, The decorative layer also includes a matte layer disposed on the plastic substrate layer.

18. The method according to any one of claims 14 to 16, characterized in that, Also includes: A matte layer is applied to the plastic substrate layer.

19. A terminal comprising the housing assembly as described in any one of claims 1 to 13.

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