CN110744942A

CN110744942A - Manufacturing method of gradient shell, gradient shell and electronic equipment

Info

Publication number: CN110744942A
Application number: CN201911121005.9A
Authority: CN
Inventors: 田振煌; 李静
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-11-15
Filing date: 2019-11-15
Publication date: 2020-02-04

Abstract

The application relates to the technical field of electronic equipment, and particularly discloses a manufacturing method of a gradient shell, the gradient shell and the electronic equipment, wherein the method comprises the following steps: providing a substrate, wherein the substrate comprises a first surface and a second surface which are oppositely arranged; spraying the ink on the first surface by ink jet printing a plurality of times according to a predetermined design; standing the base material after the ink jet printing is finished for a preset time, and curing the ink to form a gradient layer; and arranging a texture layer, an optical film layer and a bottom color layer on one side of the gradient layer, which is back to the first surface, in sequence to obtain the primary shell. In this way, this application can realize that the technical effect that gradient shell image does not have the graininess, simultaneously, makes the gradient color effect and the texture effect of gradient color shell pattern better.

Description

Manufacturing method of gradient shell, gradient shell and electronic equipment

Technical Field

The present disclosure relates to the field of electronic devices, and in particular, to a method for manufacturing a color-changing housing, and an electronic device.

Background

At the present stage, the gradual change color shells of electronic devices such as mobile phones, tablet computers and smart watches have a single color surface effect which cannot meet the requirement of consumers on the changeability of the appearance effect of the electronic devices due to the serious homogenization and the aesthetic fatigue, and users also begin to pursue richer and diversified appearance effects of the gradual change color shell surface.

Disclosure of Invention

The application aims at solving the technical problems that ink dots formed by ink jet printing in the prior art are distributed in a dot mode, and a gradient color shell pattern has granular feeling. Therefore, the application provides a manufacturing method of a gradient shell, the gradient shell and electronic equipment, which can achieve the technical effect that the image of the gradient shell has no granular sensation, and simultaneously, the gradient color effect and the texture effect of the pattern of the gradient shell are better.

The application provides a manufacturing method of a gradient color shell, which comprises the following steps: providing a substrate, wherein the substrate comprises a first surface and a second surface which are oppositely arranged; spraying the ink on the first surface by ink jet printing a plurality of times according to a predetermined design; standing the base material after the ink jet printing is finished for a preset time, and curing the ink to form a gradient layer; and arranging a texture layer, an optical film layer and a bottom color layer on one side of the gradient layer, which is back to the first surface, in sequence to obtain the primary shell.

The application provides a gradual change look casing, adopts the manufacturing approach as aforementioned gradual change look casing to make, and this gradual change look casing includes: a substrate comprising a first surface and a second surface disposed opposite one another; the gradient layer, the texture layer, the optical film layer and the bottom color layer are sequentially stacked on the first surface; wherein, the gradual change layer is a continuous medium composed of a plurality of ink dots which are continuously distributed.

The application proposes an electronic device, which comprises: the shell body of the gradual change color is the shell body of the gradual change color as described above; the display screen assembly is connected with the gradient color shell, and an installation space is defined between the display screen assembly and the gradient color shell; and the mainboard is arranged in the mounting space and is electrically connected with the display screen assembly.

The beneficial effect of this application is: different from the situation in the prior art, because this application does not solidify at the inkjet printing in-process, the ink fuses each other in the time of stewing of ink, solidifies again the ink in order to form the gradual change layer, because the ink of gradual change layer is continuous distribution and does not have the clearance between a plurality of ink points of ink, consequently can realize the not outward appearance effect of graininess of gradual change casing image. Further, this application utilizes gradual change layer and bottom color layer to guarantee the opacity of gradual change look casing to through combining optics rete with gradual change layer, bottom color layer, solved the big problem of simple optics rete colour range of change, make the gradual change look effect and the texture effect of gradual change look casing pattern better.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:

FIG. 1 is a schematic flow chart illustrating a method for manufacturing a tapered housing according to an embodiment of the present disclosure;

FIG. 2 is a schematic flow chart of step S102 in FIG. 1;

FIG. 3 is a schematic flow chart illustrating a method for manufacturing a tapered housing according to another embodiment of the present disclosure;

FIG. 4 is a schematic flow chart illustrating a method for manufacturing a tapered housing according to another embodiment of the present disclosure;

FIG. 5 is a schematic flow chart illustrating a method for manufacturing a tapered housing according to still another embodiment of the present disclosure;

FIG. 6 is a schematic flow chart illustrating a method for manufacturing a tapered housing according to still another embodiment of the present disclosure;

FIG. 7 is a schematic flow chart of step S104 in FIG. 1;

fig. 8 is a flowchart illustrating step S141 in fig. 7;

FIG. 9 is a schematic flow chart illustrating a method for manufacturing a tapered housing according to still another embodiment of the present disclosure;

FIG. 10 is a schematic structural diagram of an embodiment of a gradient shell according to the present application;

FIG. 11 is a schematic structural view of another embodiment of a gradient shell according to the present application;

FIG. 12 is a schematic structural view of another embodiment of a gradient shell according to the present application;

FIG. 13 is a schematic structural view of a further embodiment of a gradient shell according to the present application;

FIG. 14 is a schematic structural view of a further embodiment of a gradient shell according to the present application;

FIG. 15 is a schematic structural view of a further embodiment of a gradient shell according to the present application;

fig. 16 is a schematic structural diagram of an embodiment of an electronic device according to the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the prior art, a random UV curing scheme is usually adopted to cause the discontinuous distribution of ink dots, and the ink dots are formed by irregular gaps; when light is reflected by the coating layer through the ink-jet printing layer and the texture layer and then returns through the texture layer, the light passing through the gap is stronger than the light passing through the ink layer due to the existence of the gap in the ink-jet printing layer, so that the gap becomes obvious, and visible particle spots are formed.

In order to overcome the defects in the prior art, the application provides a manufacturing method of a shell with gradually changed colors. Referring to fig. 1, fig. 1 is a schematic flow chart of an embodiment of a method for manufacturing a gradient shell according to the present application, the method including the following steps:

s101: a substrate is provided.

In the above embodiments, the substrate is a PMMA plate, a PC plate, a PET plate, or a PMMA/PC composite plate. The thickness of the substrate is 0.1 mm to 1.5 mm, for example, 0.1 mm, 0.5 mm, 1 mm, 1.5 mm, and the thickness can be selected as desired. Substrates may include, but are not limited to, 2D, 2.5D, 3D substrates.

The substrate is a transparent substrate, and the substrate may be made of PET (Polyethylene terephthalate, abbreviated as PET), PMMA (Poly methyl methacrylate, abbreviated as PMMA), PC (Poly carbonate, abbreviated as PC), or PMMA/PC composite material.

PMMA and PC are compounded in a bonding mode, and PMMA and PC can also be compounded in a co-extrusion compounding mode. Wherein, the thickness ratio of the PMMA/PC composite board is as follows: 10% -90% of a PC layer; and 90% -10% of the PMMA layer. The PC with good toughness is used as the inner layer, so that the toughness and the tear strength of the gradient-color shell can be improved; and the PMMA is arranged on the outer layer, so that the excellent hardness of the PMMA can be fully utilized, and the external impact resistance of the gradient color shell is improved.

Wherein the substrate comprises a first surface and a second surface which are oppositely arranged.

S102: the ink is sprayed onto the first surface by ink jet printing a plurality of times according to a predetermined design.

Specifically, the ink is sprayed on the first surface by ink jet printing for multiple times to form a gradient ink layer to be cured. The inkjet printing may include the following scheme:

referring to fig. 2, fig. 2 is a schematic flow chart of step S102 in fig. 1, and the steps of scheme 1 are as follows:

s121: an area to be painted on the first surface is set.

The areas to be sprayed at least comprise a first area to be sprayed and a second area to be sprayed which are adjacent.

S122: and spraying the ink on the first area to be sprayed and the second area to be sprayed.

S123: and spraying the ink on the second area to be sprayed for spraying.

It can be understood that after the multiple spraying of the first scheme, the first area to be sprayed is the area where the pigment particles of the ink are distributed most sparsely, and the second area to be sprayed is the area where the pigment particles of the ink are distributed most densely, and the gradual change of the ink layer to be cured is formed through the density distribution of the pigment particles of the ink.

Unlike scheme 1, scheme 2 is: the spraying step comprises a first spraying step, a second spraying step and a third spraying step, wherein the first spraying step is used for spraying a first area to be sprayed, the second spraying step is used for spraying a second area to be sprayed, the third spraying step is used for spraying a third area to be sprayed, the colors of the pigment particles of the first spraying step, the second spraying step and the third spraying step are different, for example, the pigment particles of the first spraying step are white, the pigment particles of the second spraying step are blue, and the pigment particles of the third spraying step are purple, so that a gradual change effect from white to purple can be realized. It can be understood that after the two different areas to be sprayed are respectively sprayed by the scheme, the color of the pigment particles sprayed by the first spraying, the second spraying and the third spraying is adjusted to form a gradually changed ink layer to be cured.

S103: and standing the substrate after the ink jet printing is finished for a preset time, and curing the ink to form a gradient layer.

Specifically, in the first scheme, the thicknesses of the inks in the first to-be-sprayed area, the second to-be-sprayed area and the third to-be-sprayed area are different, and when the printing ink is kept still for a preset time, the thicknesses of the inks in the to-be-sprayed areas are relatively consistent, the preset time may be 2 to 5 minutes, for example, 2 minutes, 3 minutes, 4 minutes and 5 minutes, and the setting is specifically performed according to the thicknesses and materials of the inks, which is not limited herein.

After the inks are mutually fused, the inks of the gradient layer are continuously distributed, and gaps do not exist among a plurality of ink points of the inks, so that the appearance effect that the gradient shell image has no granular feeling can be realized.

S104: and arranging a texture layer, an optical film layer and a bottom color layer on one side of the gradient layer, which is back to the first surface, in sequence to obtain the primary shell.

Specifically, the thickness of the texture layer can be 5-20 micrometers, such as 5 micrometers, 10 micrometers, 15 micrometers, and 20 micrometers. Therefore, the shell with the gradually-changed color has a good texture effect, and the whole thickness of the shell with the gradually-changed color is small. Alternatively, the texture layer may be formed on the gradation layer using a UV transfer process, the texture layer may be formed of colorless UV ink, and the texture layer may also be formed of colored UV ink. When the texture layer is formed by colored UV ink, the texture layer has the function of enabling the gradient color shell to have texture effect, and meanwhile, the gradient color shell can also have color effect. The texture layer may be a single layer or a plurality of layers.

The optical film layer may be an indium oxide layer, a tin oxide layer, or an indium tin oxide layer. For example, the indium oxide layer may be an indium oxide layer, the tin oxide layer may be a tin dioxide layer, and the indium tin oxide layer may be an indium tin oxide layer. It is worth noting that when the optical film layer adopts an indium oxide layer, a tin oxide layer or a laminated structure of the indium oxide layer and the tin oxide layer, the surface glaze texture and the fine optical texture effect can be simultaneously realized by combining the deep-color ground color layer, and different visual effects can be realized at different angles, so that the user experience is good.

The color of the base color layer is not particularly limited, and may be flexibly selected as desired by those skilled in the art as long as the requirements are satisfied, and may include, but is not limited to, red, orange, yellow, green, cyan, blue, violet, and the like, for example. Therefore, any different colors can be selected to meet the use requirements of different users.

Be different from prior art's condition, this application does not solidify at the inkjet printing in-process, and the time of stewing of printing ink fuses each other, solidifies again printing ink in order to form the gradual change layer, because the printing ink on gradual change layer is continuous distribution and does not have the clearance between a plurality of ink points of printing ink, consequently can realize the not appearance effect of graininess of gradual change casing image. Further, this application utilizes gradual change layer and bottom color layer to guarantee the opacity of gradual change look casing to through combining optics rete with gradual change layer, bottom color layer, solved the big problem of simple optics rete colour range of change, make the gradual change look effect and the texture effect of gradual change look casing pattern better.

In the above examples, the ink was UV ink or slow drying type ink.

Specifically, when the ink is UV ink, the UV ink can be rapidly cured under the irradiation of a UV lamp, wherein the UV ink does not contain a solvent, cannot corrode pigment particles, and enables the service life of the gradient layer to be longer.

When the ink is a slow drying type ink, the slow drying type ink comprises a slow drying type organic solvent, the slow drying type organic solvent can be isophorone, white gasoline, propylene glycol methyl ether acetate and the like, so that the ink can be fused with each other, and after the ink is kept still for a preset time, the slow drying type ink can be cured by a heating drying method.

In the above embodiments, the ink includes a leveling aid.

Specifically, the leveling aid is an aid which can reduce the surface tension of the ink, increase the wettability and improve the leveling effect under a dynamic or static condition. The addition of a proper amount of leveling assistant can promote the mutual fusion of the printing ink to form a relatively flat, smooth and uniform gradient layer.

Referring to fig. 3, fig. 3 is a schematic flow chart of another embodiment of the method for manufacturing a gradient color case of the present application, in an embodiment, when the substrate is a PMMA/PC composite board, the substrate includes a PMMA layer and a PC layer that are stacked, a surface of the PC layer away from the PMMA layer forms a first surface, and a surface of the PMMA layer away from the PC layer forms a second surface. At this time, after step S104, the method further includes the steps of:

s105: and bending the primary shell.

Specifically, the primary housing obtained in step S104 is bent. And after the primary shell is bent, the primary shell is provided with an inner concave surface and an outer convex surface opposite to the inner concave surface. The gradient layer, the texture layer, the optical film layer and the bottom color layer are all positioned on the inner concave surface.

In one embodiment, the method of bending the primary housing may be high pressure molding. High pressure forming refers to a process in which the material is shaped at a pressure of greater than 14 kg/cm, approximately 1.4X 10 Pa. The technological parameters of high-pressure forming comprise: the temperature of the forming die is 90-150 ℃, the temperature of the heating plate is 150-300 ℃, the inflation pressure is 10-30 Bar, and the forming time is 60-150 seconds. The temperature of the forming mold and the temperature of the heating plate are appropriate and matched with each other, if the temperature is too high, the surface (especially the convex surface) of the primary shell is prone to wrinkle and bubble, and if the temperature is too low, the primary shell is cracked, especially the arc-shaped part of the convex surface.

In another embodiment, the method of bending the primary housing is hot press forming, and the step of hot press forming includes: firstly, placing a primary shell in a lower die, heating for 15-30 seconds under the condition that the temperature of a heating plate is 250-380 ℃, and controlling the temperature of the lower die to be 90-140 ℃; and then closing the upper die and the lower die, and keeping the pressure for 10-30 seconds, wherein the temperature of the upper die is 90-130 ℃. The temperature of the heating plate, the temperature of the upper die and the temperature of the lower die are required to be proper and matched with each other, if the temperature is too high, the primary shell is prone to wrinkle and bubble (particularly the convex surface), and if the temperature is too low, the primary shell is cracked, particularly the arc-shaped part of the convex surface.

S106: and carrying out curtain coating on the second surface to enable the second surface to adsorb a layer of hardening liquid to be subjected to UV curing.

S107: and carrying out UV curing treatment on the second surface after the curtain coating so as to form a hardened layer on the second surface, thereby obtaining the intermediate shell.

Specifically, the second surface of the substrate is coated with the curing liquid by flow coating, then baked at 60 ℃ to 90 ℃ (e.g., 60 ℃, 70 ℃, 80 ℃, 90 ℃) for 3 minutes to 10 minutes (e.g., 3 minutes, 5 minutes, 7 minutes, 10 minutes), and then irradiated with ultraviolet light to cure, thereby obtaining a cured layer.

In one embodiment, the hardening liquid comprises the following components in parts by weight: 1.0 part of ultraviolet curing agent and 0.8-1.2 parts of diluent. The ultraviolet curing agent can be polyurethane acrylate with silicone resin and perfluoropolyether acrylate added, such as a curing liquid with model number 304 from PPG company; curing energy 400mj/cm²～1200mj/cm²E.g. 400mj/cm²、500mj/cm²、700mj/cm²、1200mj/cm²。

It is to be understood that the hardening liquid is not limited to the above-mentioned ones, and may be one commonly used in the art. The hardened layer prepared by the hardening liquid has better wear resistance and scratch resistance.

Referring to fig. 4, fig. 4 is a schematic flow chart of a manufacturing method of a gradient shell according to another embodiment of the present application, and further, after step S107, the method further includes:

s108: and cutting and polishing the medium-grade shell containing the hardened layer through a CNC (computerized numerical control) process to obtain the gradient-color shell.

Specifically, the intermediate shell including the hardened layer is first subjected to CNC machining so as to give the shell an arc-shaped edge, and then the shell having the arc-shaped edge is subjected to molding processing based on the target shape so as to obtain a gradation-colored shell.

Thus, the prepared color-graded shell can be simply provided with a target shape and arc-shaped edges. According to the embodiment of the present application, the specific manner of performing the molding process is not particularly limited, and only needs to satisfy obtaining the gradation color casing of the desired shape.

For example, the molding process may be realized by hot press molding or CNC profile processing. According to the specific embodiment of this application, can be earlier to being formed with the intermediate level casing carry out CNC processing, make it have the arc edge, realize 2.5D's outward appearance effect, then carry out the hot briquetting to the intermediate level casing that has the arc edge again, make the surface of intermediate level casing towards sclerosis layer one side have the arc structure, the gradual change look casing that from this preparation has 3D's outward appearance effect.

The hot press molding can be formed by a high-pressure forming machine table and comprises the steps of loading a plate, baking and softening the plate by IR (infrared ray), closing the die, filling high-pressure gas, maintaining the pressure, opening the die and taking out a product and the like. Wherein the baking temperature of the IR baking (infrared baking) is 300-. Preferably, the IR baking is carried out at a baking temperature of 400 ℃ for 30 seconds, a mold temperature of 135 ℃ for holding pressure, and an air pressure of 70kg for 15 seconds.

According to the embodiment of the present application, the shape of the gradated color casing obtained by the CNC processing and the molding process is not particularly limited, and may be selected by those skilled in the art according to actual circumstances. For example, a four-curved-surface structure and a gradient-color shell with a 3D visual effect can be obtained, and the shell is suitable for serving as a shell of electronic equipment.

In order to further improve the performance of the shell with the gradually changed color, after CNC processing is performed to form an arc-shaped edge, ultrasonic cleaning and surface strengthening treatment can be performed to further strengthen the formed arc-shaped edge. In addition, after the molding treatment, the prepared gradient shell can be fully inspected, so that the gradient shell with excellent quality and good performance can be obtained.

According to the embodiments of the present application, the thickness of the gradient color shell finally prepared by the method is not particularly limited, and can be selected by those skilled in the art according to actual requirements. For example, the thickness of the prepared gradient color shell can be 0.85 ± 0.08 mm. According to a specific embodiment of the present application, the thickness of the prepared color graded shell may be 0.85 mm. According to the embodiment of the application, the width and the height of the arc-shaped edge formed by performing the CNC machining process are not particularly limited, and can be selected by a person skilled in the art according to actual needs. For example, the arcuate edge may have a width of 1.6 ± 0.08 millimeters and a height of 0.3 ± 0.08 millimeters. According to a specific embodiment of the present application, the arcuate edge may have a width of 1.6 millimeters and a height of 0.3 millimeters.

Referring to fig. 5, fig. 5 is a schematic flow chart of a manufacturing method of the gradient color shell according to another embodiment of the present application, in which a specific material of the base material may be PET, so that the gradient color shell has good wear resistance, good high temperature resistance, and low cost. At this time, before step S102, the method further includes:

s109: a PET protective film is provided.

S110: and the PET protective film is attached to the second surface of the base material through the release layer so as to protect the base material.

Specifically, the PET protection film comprises a PET protection layer and a release layer. The release layer is usually made of an organic insulating material such as PI, OC, or DBL. The PET protective film can prevent the base material from being damaged in the processing process.

Referring to fig. 6, fig. 6 is a schematic flow chart of a manufacturing method of a gradient shell according to still another embodiment of the present application, and further, after step S104, the method further includes:

s111: punching and molding the primary shell to obtain a primary shell with a target size;

s112: stripping the release layer;

s113: and bonding the primary shell with the target size with the transparent plate through OCA (optical clear adhesive) to obtain the shell with the gradually changed color.

Specifically, firstly, the transparent plate is cut and polished by a CNC process to obtain a transparent plate with a target size, wherein a groove for accommodating the primary shell is formed in the transparent plate. Then the primary shell is cut into the size of the groove suitable for the transparent plate, and the cutting precision is +/-0.05 mm. OCA optical cement is arranged in the groove of the transparent plate, wherein the OCA optical cement can be coated or laminated. And finally, attaching the primary shell with a proper size in the groove for fixing, thus obtaining the shell with the gradually changed color.

Wherein, the transparent plate is made of glass, toughened glass, sapphire, acrylic or transparent plastic material.

Referring to fig. 7, fig. 7 is a schematic flowchart of step S104 in fig. 1, in an embodiment, step S104 specifically includes:

s141: and transferring the target texture to the side, opposite to the first surface, of the gradient layer to form a texture layer.

S142: and forming an optical film layer on one side of the texture layer, which is back to the gradient layer, by adopting a vacuum evaporation method, a magnetron sputtering method or an electron beam evaporation method.

Specifically, after the metal target material is evaporated, the substrate is placed in a vacuum environment, and the evaporated metal target material is deposited on one side of the texture layer, which is back to the gradient layer, so as to form the optical film layer.

In the embodiment of the present application, the optical film layer may be formed by sputtering, and the sputtering process is a process of bombarding a solid surface with particles (ions or neutral atoms, molecules) with a certain energy, so that the atoms or molecules near the surface of the solid obtain a sufficient energy to finally escape from the solid surface. Sputtering can only be performed under a certain vacuum condition. The metal target is dissolved by directly heating or indirectly heating, and then evaporated (or directly sublimated from a solid into gas), atoms or molecules with enough energy fly to and are sputtered on the surface of a workpiece, and an optical film layer with a certain thickness is deposited. The thickness of the optical film layer directly influences the color depth, different thicknesses correspond to colors of different depths, and the optical film layer is matched with the texture of the texture layer.

The material of the optical film layer may be an indium oxide layer, a tin oxide layer, or an indium tin oxide layer. For example, the indium oxide layer may be an indium oxide layer, the tin oxide layer may be a tin dioxide layer, and the indium tin oxide layer may be an indium tin oxide layer, or may be other metals meeting the process conditions, which is not limited in this application.

Further, the length of the plating time is determined according to the effect, and the longer the plating time is, the thicker the film thickness is, and the brighter the metallic luster effect is. The optical film layer is a metal film, and the thicker the film thickness is, the brighter the metallic luster effect is; and the thinner the thickness, the greater the impedance. The thickness is controlled by the coating time. In this embodiment, the thickness of the optical film layer is not more than 50 μm, and the impedance of the optical film layer is not less than 4000 megohms.

S143: and (3) coating base color ink on one side of the optical film layer, which is opposite to the texture layer, for multiple times by adopting a silk-screen, roller coating or spin coating process to form a base color layer.

Specifically, the base color layer is a multilayer structure sequentially arranged in the thickness direction, and can be formed by coating base color ink for multiple times, and the number of the base color layers is not limited in the embodiments of the present application. The thickness of each bottom color layer is 0.006-0.01 mm, such as 0.006 mm, 0.008 mm, 0.009 mm, 0.01 mm; the baking temperature is 75-95 ℃, for example, 75 ℃, 80 ℃, 85 ℃ and 95 ℃; the baking time is 30 to 60 minutes, for example, 30 minutes, 40 minutes, 50 minutes, 60 minutes. Preferably, the ground color layer comprises a first ground color layer, a second ground color layer and a third ground color layer which are sequentially superposed, wherein the first ground color layer is close to the optical film layer, white ink is printed on the optical film layer for the first time, the baking temperature is 90 ℃, the baking time is 30 minutes, and the first ground color layer with the thickness of 0.006-0.01 mm is formed; printing white ink for the second time, wherein the baking temperature is 90 ℃, and the baking time is 30 minutes, so that a second bottom color layer with the thickness of 0.006-0.01 mm is formed; and printing white ink for the third time, wherein the baking temperature is 90 ℃, and the baking time is 60 minutes, so that a third bottom color layer with the thickness of 0.006-0.01 mm is formed. The bottom color layer can ensure the opacity of the shell with the gradually changed color, so that the pattern texture effect of the shell with the gradually changed color is better.

Referring to fig. 8, fig. 8 is a schematic flowchart of step S141 in fig. 7, and in an embodiment, step S141 specifically includes:

s1411: a transfer mold having a target texture is provided.

S1412: and adding UV glue into the transfer printing mold.

The type of UV glue is not particularly limited according to embodiments of the present application and may be selected by those skilled in the art according to actual needs.

S1413: and putting the base material into a transfer printing mold, and pressing the transfer printing mold to form a UV adhesive layer with texture on one side of the gradual change layer, which is back to the first surface.

S1414: and curing the UV adhesive layer with the texture by using ultraviolet rays to form a texture layer.

Specifically, the target texture in the transfer mold is transferred by UV glue onto the side of the graded layer facing away from the first surface. According to the embodiment, the texture layer can be formed by firstly printing the UV glue on a transfer mold with a target texture in a screen printing mode; then, placing the substrate on a transfer mold, wherein the side having the optical film layer is in contact with the transfer mold; and then, pressing the base material onto a transfer printing mold by using a rubber roller, and irradiating the base material below the transfer printing mold by using an LED lamp to primarily cure the UV adhesive, wherein the curing energy is generally 1200-2600 mj/cm²E.g. 1200mj/cm²、1500mj/cm²、2000mj/cm²、2600mj/cm². Then, irradiating the bonded substrate and transfer mold with mercury lamp for secondary curing, wherein the curing energy is generally 800-1500 mj/cm²E.g. 800mj/cm²、1000mj/cm²、1200mj/cm²、1500mj/cm². And finally, taking the transferred base material out of the transfer printing mold, and finally forming a texture layer on the base material.

According to the embodiment of the present application, the texture type (e.g., texture shape, texture color) of the formed texture layer is not particularly limited, and may be selected by those skilled in the art according to actual needs. For example, a transfer mold having a target texture may be fabricated to realize the design of different texture layers, and more particularly, the texture layers may include light pillars, S-stripes, which can move light shadows, peacock stripes having a high reflection effect, and at least one of colorful stripes, which can obtain seven colors.

The thickness of the texture layer is not particularly limited according to the embodiment of the present application, and may be selected by those skilled in the art according to actual needs. For example, the texture layer may have a thickness of 10 to 50 μm. In some embodiments of the present application, the textured layer has a thickness of 10 microns, 15 microns, 18 microns, or 20 microns. According to the embodiment of the present application, the light transmittance of the texture layer is not particularly limited, and may be selected by those skilled in the art according to actual requirements. For example, the light transmittance of the texture layer may be 20% to 60%. The inventor finds that the method can obtain target texture layers with various appearance patterns, the surface of the obtained texture layer is bright and smooth, wear-resistant and press-resistant, the thickness can be regulated and controlled, and the appearance effect of the prepared gradient-color shell is remarkably improved.

Referring to fig. 9, fig. 9 is a schematic flowchart illustrating a method for manufacturing a gradient shell according to still another embodiment of the present application, in which, before step S102, the method further includes:

s114: a LOGO layer is disposed on the first surface.

Wherein, the LOGO layer is located between the substrate and the graded layer.

Specifically, the LOGO layer can be formed by a screen printing mode, and the thickness of the LOGO layer is 0.001-0.005 mm, such as 0.001 mm, 0.002 mm, 0.004 mm and 0.005 mm.

Further, in order to satisfy the higher outward appearance needs of shell, can be at the first surface sculpture of substrate and the recess that the LOGO layer matches to laminate the LOGO layer in the recess. The glyptic mode can be carried out through the digit control machine tool, and the degree of depth of recess can be 0.1 millimeter, then will prefabricate good LOGO layer in advance and pass through the glue laminating in the recess, and the LOGO layer can be the three-dimensional LOGO of nickel sheet that the gross thickness is 0.08 millimeter. The shape of the LOGO layer can be changed according to design requirements, such as Chinese characters, letters, symbols, animals and the like, which is not limited in this embodiment.

This embodiment is through increasing the LOGO layer in the casing after, the popularity and the identification degree that can greatly increased product.

Referring to fig. 10, fig. 10 is a schematic structural diagram of an embodiment of a gradient shell according to the present application, and the gradient shell 100 is manufactured by using a manufacturing method of a gradient shell according to the embodiment of the present application.

The gradation color casing 100 includes: a substrate 11, wherein the substrate 11 comprises a first surface 111 and a second surface 112 arranged oppositely. The gradient color housing 100 further includes: the gradation layer 12, the texture layer 13, the optical film layer 14, and the base color layer 15 provided on the first surface 111 are sequentially stacked. The gradient layer 12 is a continuous medium composed of a plurality of ink dots distributed continuously.

Specifically, as will be understood by those skilled in the art, in the ink jet printing, the ink is ejected from the nozzles of the head under the control of the ink jet controller to be printed on the substrate, and the formed ink dots are related to the resolution of the printed image, for example, the 1440 × 720dpi in the prior art refers to 1440 × 720 ink dots per square inch of area.

However, since the plurality of dots in the gradient layer 12 of the present invention are continuously distributed and there is no gap between the plurality of dots, there is no dot which is isolated from the other dots in appearance, and the number of dots per square inch cannot be counted.

Different from the prior art, because this application does not solidify in the inkjet printing process, the ink fuses each other in the standing time of ink, solidifies again the ink in order to form gradual change layer 12, because the ink of gradual change layer 12 is continuous distribution and does not have the clearance between a plurality of ink points of ink, consequently can realize the not granular outward appearance effect of gradual change color casing 100 image. Further, this application has guaranteed the opacity of gradual change casing 100 with gradual change layer 12 and bottom color layer 15 to through combining optics rete 14 with gradual change layer 12, bottom color layer 15, solved the big problem of simple optics rete 14 color variation range, make the gradual change color effect and the texture effect of gradual change casing 100 pattern better.

The substrate 11 of the above example is a PMMA plate, a PC plate, a PET plate or a PMMA/PC composite plate.

Referring to fig. 11, fig. 11 is a schematic structural diagram of another embodiment of the gradient color housing of the present application, in which the PMMA/PC composite plate of the above embodiment includes a PMMA layer 101 and a PC layer 102 stacked together, a surface of the PC layer 102 away from the PMMA layer 101 constitutes a first surface 111, and a surface of the PMMA layer 101 away from the PC layer 102 constitutes a second surface 112.

Wherein, when the base material 11 is a PMMA/PC composite board, the color-gradient shell 100 further includes: a hardened layer 16, the hardened layer 16 being disposed on one side of the second surface 112. Wherein the hardness of the hardened layer 16 is 3H-5H, such as 3H, 4H, 5H; the thickness of the hardened layer 16 is 1 to 20 micrometers, for example, 1 micrometer, 5 micrometers, 10 micrometers, 20 micrometers. Preferably, the thickness of the hardened layer 16 is 8 to 10 micrometers, such as 8 micrometers, 9 micrometers, 10 micrometers.

It will be appreciated that the thickness of the hardened layer 16 may be adjusted as desired. If the hardness is too low, the wear resistance and the scratch resistance are poor; if the hardness is too high, the brittleness of the hardened layer 16 increases, and the production efficiency is lowered. The hardness of the hardened layer 16 can be adjusted by adjusting the thickness and the curing energy of the hardened layer 16.

Referring to fig. 12, fig. 12 is a schematic structural diagram of another embodiment of the gradient color housing of the present application, and when the base material 11 is a PET plate, the gradient color housing 100 further includes: the OCA optical cement layer 17 and the transparent plate 18 are sequentially stacked on the second surface 112.

The OCA optical cement is used for cementing special adhesives of transparent optical elements (such as lenses and the like). The adhesive has the characteristics of no color, transparency, light transmittance of more than 90 percent, good bonding strength, capability of being cured at room temperature or middle temperature, small curing shrinkage and the like. The OCA optical cement is selected as the adhesive, so that the light transmittance of the product can be increased, and the aesthetic feeling is improved.

In this embodiment, the light transmittance of the OCA optical adhesive layer 17 is greater than or equal to 99%, and the peeling force of the OCA optical adhesive layer 17 is greater than or equal to 30N; the transparent plate 18 is made of glass, toughened glass, sapphire, acrylic or transparent plastic material.

Referring to fig. 13, fig. 13 is a schematic structural diagram of a gradient shell according to still another embodiment of the present application, in which the gradient shell 100 further includes: a LOGO layer 19 disposed between the substrate 11 and the graded layer 12. The thickness of the LOGO layer 19 is 0.001-0.005 mm, such as 0.001 mm, 0.002 mm, 0.003 mm, 0.005 mm.

Further, referring to fig. 14, fig. 14 is a schematic structural view of another embodiment of the gradient shell of the present application, a groove matched with the LOGO layer 19 is formed on the first surface 111 of the substrate 11, and the LOGO layer 19 is accommodated in the groove. The degree of depth of recess can be 0.1 millimeter, then will prefabricate good LOGO layer 19 in advance and pass through the glue laminating in the recess, LOGO layer 19 can be the three-dimensional LOGO of nickel piece that the gross thickness is 0.08 millimeters.

The material of the optical film layer 14 of the above embodiment includes at least one of indium, aluminum, zinc and indium-tin alloy, and the resistance value of the optical film layer 14 is equal to or greater than 4000 megohms.

Preferably, the optical film 14 is an indium tin film, which plays a role of reflecting light and providing metallic luster effect, and the indium tin film is a non-conductive metal film when being thin, and can reflect light like a mirror surface.

Referring to fig. 15, fig. 15 is a schematic structural diagram of a gradient shell according to another embodiment of the present application, in which a bottom color layer 15 of the above embodiment is a multi-layer structure; wherein, the dyne value of the outermost bottom color layer 151 far away from the optical film layer 14 is larger than 32, and the thickness of each bottom color layer 15 is 0.006-0.01 mm, such as 0.006 mm, 0.007 mm, 0.008 mm and 0.01 mm.

For the embodiment of the gradient casing 100, please refer to the partial description of the embodiment of the method for manufacturing the gradient casing.

Referring to fig. 16, fig. 16 is a schematic structural diagram of an embodiment of an electronic device according to the present application. The electronic device may be a cell phone, a tablet, an e-book reader, an audio player, a digital camera, a laptop portable computer, a vehicle computer, a desktop computer, a personal digital assistant, a wearable device, and the like. The electronic apparatus 200 includes: the display screen assembly comprises a gradient casing 1, a display screen assembly 2 and a main board (not shown).

The gradient casing 1 is a gradient casing 100 provided in the above embodiment. The display screen assembly 2 is connected with the gradient color shell 1, and an installation space is defined between the display screen assembly 2 and the gradient color shell 100. The mainboard is established in installation space and is connected with display screen subassembly 2 electricity.

Be different from prior art, because this application does not solidify at the inkjet printing in-process, the ink fuses each other in the time of standing of ink, solidifies again to ink in order to form the gradual change layer, because the ink of gradual change layer is continuous distribution and does not have the clearance between a plurality of ink points of ink, consequently can realize that electronic equipment's casing image does not have the appearance effect of graininess. Further, this application utilizes gradual change layer and ground color layer to guarantee the opacity of electronic equipment's casing to through combining optics rete with gradual change layer, ground color layer, solved the big problem of simple optics rete colour range of change, make the gradual change colour effect and the texture effect of electronic equipment's casing pattern better.

The above embodiments are merely examples, and not intended to limit the scope of the present application, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present application, or those directly or indirectly applied to other related arts, are included in the scope of the present application.

Claims

1. A method of making a gradient-color shell, the method comprising:

providing a substrate comprising a first surface and a second surface oppositely disposed;

spraying ink onto the first surface by inkjet printing a plurality of times according to a predetermined design;

standing the substrate after the ink jet printing is finished for a preset time, and curing the ink to form a gradient layer;

and sequentially arranging a texture layer, an optical film layer and a bottom color layer on one side of the gradient layer, which is back to the first surface, so as to obtain the primary shell.

2. The method of claim 1, wherein said step of spraying ink onto said first surface a plurality of times by ink jet printing according to a predetermined design comprises:

setting a region to be sprayed on the first surface, wherein the region to be sprayed at least comprises a first region to be sprayed and a second region to be sprayed which are adjacent;

spraying the printing ink on the first area to be sprayed and the second area to be sprayed;

and spraying the ink on the second area to be sprayed for spraying.

3. The method of claim 1, wherein the ink is a UV ink or a slow-drying ink.

4. The method of claim 1, wherein the ink includes a leveling aid.

5. The method of claim 1,

the base material is a PMMA plate, a PC plate, a PET plate or a PMMA/PC composite plate.

6. The method of claim 5, wherein the PMMA/PC composite plate comprises a PMMA layer and a PC layer which are superposed, wherein the surface of the PC layer far away from the PMMA layer forms the first surface, and the surface of the PMMA layer far away from the PC layer forms the second surface;

when the base material is a PMMA/PC composite board, after the step of sequentially disposing a texture layer, an optical film layer, and a ground color layer on a side of the graded layer opposite to the first surface to obtain a primary housing, the method further comprises:

bending the primary housing;

carrying out curtain coating on the second surface to enable the second surface to adsorb a layer of hardening liquid to be subjected to UV curing;

and carrying out UV curing treatment on the second surface after the curtain coating so as to form the hardened layer on the second surface and obtain the intermediate-grade shell.

7. The method according to claim 6, wherein after the step of performing a UV curing treatment on the coated second surface to form the hardened layer on the second surface to obtain the intermediate shell, the method further comprises:

and cutting and polishing the medium-grade shell containing the hardened layer by a CNC (computerized numerical control) process to obtain the gradient-color shell.

8. The method of claim 5, wherein said step of applying ink to said first surface in a predetermined design by ink jet printing is preceded by the step of applying ink to said first surface by ink jet printing when said substrate is a PET sheet, said method further comprising:

providing a PET protective film, wherein the PET protective film comprises a PET protective layer and a release layer;

and the PET protective film is attached to the second surface of the base material through the release layer so as to protect the base material.

9. The method of claim 8, wherein after the step of sequentially disposing a texture layer, an optical film layer, and a base color layer on a side of the graded layer opposite to the first surface to obtain a primary shell, the method further comprises:

punching and molding the primary shell to obtain the primary shell with a target size;

stripping the release layer;

and bonding the primary shell with the target size with a transparent plate through OCA (optical clear adhesive) to obtain the shell with the gradually changed color.

10. The method of claim 1, wherein the step of sequentially disposing a texture layer, an optical film layer and a base color layer on a side of the graded layer opposite to the first surface comprises:

transferring a target texture to a side of the graded layer facing away from the first surface to form the texture layer;

forming the optical film layer on one side of the texture layer, which is back to the gradient layer, by adopting a vacuum evaporation method, a magnetron sputtering method or an electron beam evaporation method;

and coating base color ink on one side of the optical film layer, which is back to the texture layer, for multiple times by adopting a silk-screen, roller coating or spin coating process to form the base color layer.

11. The method of claim 10, wherein the step of transferring the target texture to a side of the graded layer facing away from the first surface to form the texture layer comprises:

providing a transfer printing mold with target texture;

adding UV glue into the transfer printing mould;

putting the base material into the transfer printing mold, and pressing the transfer printing mold to form a UV adhesive layer with texture on one side of the gradual change layer, which is back to the first surface;

and curing the UV adhesive layer with the texture by adopting ultraviolet rays to form the texture layer.

12. The method of claim 1, wherein prior to the step of applying ink to the first surface in a predetermined design by inkjet printing, the method further comprises:

disposing a LOGO layer on the first surface;

wherein the LOGO layer is positioned between the substrate and the graded layer.

13. A graduated color casing manufactured by the method of manufacturing a graduated color casing according to any one of claims 1 to 12, the graduated color casing comprising:

a substrate comprising a first surface and a second surface disposed opposite;

the gradient layer, the texture layer, the optical film layer and the bottom color layer are sequentially stacked on the first surface;

wherein, the gradual change layer is a continuous medium consisting of a plurality of ink dots which are continuously distributed.

14. The gradient-color shell of claim 13,

15. The color graded housing of claim 14, wherein the PMMA/PC composite plate comprises a PMMA layer and a PC layer stacked, a surface of the PC layer distal from the PMMA layer constituting the first surface, and a surface of the PMMA layer distal from the PC layer constituting the second surface.

16. The gradient color enclosure of claim 15, wherein when the substrate is a PMMA/PC composite panel, the gradient color enclosure further comprises:

a hardened layer disposed on one side on the second surface.

Wherein the hardness of the hardening layer is 3H-5H, and the thickness of the hardening layer is 1-20 micrometers.

17. The gradient color enclosure of claim 14, wherein when the substrate is a PET sheet, the gradient color enclosure further comprises:

the OCA optical adhesive layer and the transparent plate are sequentially stacked on the second surface;

the light transmittance of the OCA optical adhesive layer is greater than or equal to 99%, and the peeling force of the OCA optical adhesive layer is greater than or equal to 30N;

the transparent plate is made of glass, toughened glass, sapphire, acrylic or transparent plastic materials.

18. The gradient color housing of claim 13, further comprising:

a LOGO layer disposed between the substrate and the graded layer;

wherein, the thickness of LOGO layer is 0.001-0.005 millimeters.

19. The gradient-color shell of claim 13,

the material of the optical film layer comprises at least one of indium, aluminum, zinc and indium-tin alloy;

the impedance value of the optical film layer is more than or equal to 4000 megaohms.

20. The gradient color enclosure of claim 13, wherein the base color layer is a multilayer structure;

wherein the dyne value of the bottom color layer at the outermost side far away from the optical film layer is more than 32;

the thickness of each bottom color layer is 0.006-0.01 mm.

21. An electronic device, comprising:

a gradient shell as claimed in any one of claims 13 to 20;

the display screen assembly is connected with the gradient color shell, and an installation space is defined between the display screen assembly and the gradient color shell; and

the mainboard is arranged in the installation space and is electrically connected with the display screen assembly.