CN114340264B - Shell, manufacturing method thereof and electronic equipment - Google Patents
Shell, manufacturing method thereof and electronic equipment Download PDFInfo
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- CN114340264B CN114340264B CN202111671616.8A CN202111671616A CN114340264B CN 114340264 B CN114340264 B CN 114340264B CN 202111671616 A CN202111671616 A CN 202111671616A CN 114340264 B CN114340264 B CN 114340264B
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- ARXJGSRGQADJSQ-UHFFFAOYSA-N 1-methoxypropan-2-ol Chemical compound COCC(C)O ARXJGSRGQADJSQ-UHFFFAOYSA-N 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 238000002360 preparation method Methods 0.000 claims description 7
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- DKGAVHZHDRPRBM-UHFFFAOYSA-N Tert-Butanol Chemical compound CC(C)(C)O DKGAVHZHDRPRBM-UHFFFAOYSA-N 0.000 claims description 6
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- UHESRSKEBRADOO-UHFFFAOYSA-N ethyl carbamate;prop-2-enoic acid Chemical compound OC(=O)C=C.CCOC(N)=O UHESRSKEBRADOO-UHFFFAOYSA-N 0.000 claims description 4
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Abstract
The invention relates to the technical field of electronic equipment manufacturing, in particular to a shell, a manufacturing method thereof and electronic equipment. The shell matrix comprises a base material and a plastic layer integrally connected with the base material; the seal eliminating layer completely covers the joint area of the base material and the plastic layer, and the surface of one side, which is contacted with the decorative film, of the seal eliminating layer is flat. The shell is beneficial to improving the problem of marks on the decorative film at high temperature.
Description
Technical Field
The invention relates to the technical field of electronic equipment manufacturing, in particular to a shell, a manufacturing method thereof and electronic equipment.
Background
Currently, the manufacturing process of the shell generally includes: CNC processing of the base material, injection molding of plastic on the CNC-processed base material by means of nano injection molding technology (Nano Molding Technology, NMT) to form an integrally connected shell base body, and subsequent processing of the shell base body.
However, when attaching a decorative film to a shell substrate, if this process requires high temperature operation (e.g., high temperature operation is typically required to form a desired appearance effect by attaching a decorative film to a shell substrate by an out-mold decoration technique (Out Mold Decoration, OMD)), a corresponding imprint is observed on the decorative film. As shown in fig. 1 and 2, fig. 1 is a shell base, wherein 11 is a substrate, and 12 is a plastic layer; fig. 2 shows a shell formed by attaching a decorative film to a shell base, wherein 23 is an imprint on the decorative film corresponding to the bonding region of the plastic layer and the base material, and the appearance of the imprint affects the appearance of the shell product.
In addition, when the decorative film is attached to the case, even if the process of attaching the decorative film does not require a high temperature operation, the above-mentioned mark appears similarly in other processes of the subsequent processing if the high temperature operation is performed, and the appearance of the case product is affected.
Disclosure of Invention
Based on the above, the invention provides a shell, a preparation method thereof and electronic equipment, which can solve the problem that marks appear on a decorative film at high temperature.
The technical scheme for solving the technical problems is as follows:
a shell comprises a shell substrate, a printing eliminating layer and a decorative film which are sequentially laminated;
the shell matrix comprises a base material and a plastic layer integrally connected with the base material;
the seal eliminating layer completely covers the joint area of the base material and the plastic layer, and the surface of one side, which is contacted with the decorative film, of the seal eliminating layer is flat.
The invention also provides a preparation method of the shell, which comprises the following steps:
providing a shell matrix, wherein the shell matrix comprises a base material and a plastic layer integrally connected with the base material;
performing a number of offset treatments on the shell substrate, each of the offset treatments comprising a step of thermally curing the substrate and the plastic layer over a surface of the shell substrate having the plastic layer to form a coating, and a step of performing a leveling polishing treatment on the surface of the shell substrate having the coating, the offset treatments being performed a number of times until the leveling polished coating completely covers a joint region of the substrate and the plastic layer after the expansion, to obtain a shell intermediate;
and attaching a decorative film to the shell intermediate.
The invention also provides electronic equipment, which comprises a display screen and the shell, wherein the shell is provided with an accommodating space, and the display screen is arranged in the accommodating space.
Compared with the traditional scheme, the invention has the following beneficial effects:
in order to solve the problem that the mark is observed on the decorative film when the decorative film is attached at high temperature or after the decorative film is attached, the inventor of the present invention has studied and analyzed to identify that the reason is: the plastic layer and the base material are different in material, so that the thermal expansion coefficients of the plastic layer and the base material are different at high temperature, so that the deformation degree of the decorative film attached to the plastic layer and the base material is different at high temperature, and further, an imprint is observed on the decorative film at a position corresponding to the joint region of the plastic layer and the base material.
In the structure of the shell, the seal eliminating layer is arranged between the shell substrate and the decorative film, and when the substrate and the plastic layer on the shell substrate are heated and expanded, the seal eliminating layer can bear the deformation of the substrate and the plastic layer, thereby being beneficial to eliminating the seal; and the seal eliminating layer and the decorative film completely cover the joint area of the base material and the plastic layer, thereby being beneficial to avoiding the crack corresponding to the decorative film attached later.
According to the preparation method of the shell, after the shell matrix is formed by integrally connecting the plastic layer and the base material, the shell matrix is subjected to a plurality of printing elimination treatments, wherein the printing elimination treatments comprise a heat treatment step and a flattening polishing treatment step, and through the heat treatment, on one hand, the thermal expansion of the plastic layer and the base material is released in advance; on the other hand thermally cured to form a coating. After the substrate and the plastic layer are fully expanded and the surface is coated, removing the protrusions comprising a part of the coating which is thermally expanded along with the substrate and the plastic layer by polishing until the surface is flat, and obtaining the shell intermediate if the rest of the coating is observed to fully cover the joint area of the fully expanded substrate and the plastic layer. In this case, when the substrate and the plastic layer are again expanded by heat, the coating layer covering them can bear the deformation amount of the deformation of both, thereby ensuring that no corresponding imprint appears on the decorative film of the shell intermediate. If the surface is smooth, the residual coating is observed to incompletely cover the joint area of the fully expanded base material and the plastic layer, and in order to avoid the corresponding generation of cracks of the subsequently attached decorative film under the influence of the joint area of the base material and the plastic layer, the invention continues to carry out the offset eliminating treatment until the coating completely covers the joint area of the base material and the plastic layer, so as to obtain a shell intermediate, and then attach the decorative film to prepare the shell.
Drawings
FIG. 1 is a diagram showing the actual effect of a shell substrate;
FIG. 2 is a diagram showing the actual effect of the print produced by high temperature lamination of a decorative film according to the conventional method;
FIG. 3 is a graph showing the actual effect of a shell made by a method for improving imprinting;
FIG. 4 is a practical effect diagram of a shell intermediate according to an embodiment;
FIG. 5 is a practical effect diagram of the housing of an embodiment;
FIG. 6 is a schematic view of a release structure of a decorative film;
FIG. 7 is a schematic view of a non-release structure of a decorative film;
fig. 8 is a practical effect diagram of a housing of another embodiment.
Detailed Description
The present invention will be described in further detail with reference to specific examples. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Terminology
Unless otherwise indicated or contradicted, terms or phrases used herein have the following meanings:
the term "and/or," "and/or," as used herein, includes any one of two or more of the listed items in relation to each other, as well as any and all combinations of the listed items in relation to each other, including any two of the listed items in relation to each other, any more of the listed items in relation to each other, or all combinations of the listed items in relation to each other.
In the invention, the technical characteristics described in an open mode comprise a closed technical scheme composed of the listed characteristics and also comprise an open technical scheme comprising the listed characteristics.
In the present invention, the positional or positional relationship indicated by "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are positional or positional relationships based on the drawings are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus are not to be construed as limiting the present invention.
In the present invention, "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless explicitly specified otherwise
In the present invention, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features may be in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be further understood that when interpreting the connection or positional relationship of elements, although not explicitly described, the connection and positional relationship are to be interpreted as including the range of errors that should be within an acceptable range of deviations from the particular values as determined by those skilled in the art. For example, "about," "approximately," or "substantially" may mean within one or more standard deviations, and is not limited herein.
In the present invention, the numerical range is referred to, and both ends of the numerical range are included unless otherwise specified.
The temperature parameter in the present invention is not particularly limited, and may be a constant temperature treatment or a treatment within a predetermined temperature range. The constant temperature process allows the temperature to fluctuate within the accuracy of the instrument control.
Nano injection molding (Nano Molding Technology, NMT) is a technique in which plastic is directly injected onto a substrate to join the plastic layer to the substrate of different materials.
The external mold decoration technology (Out Mold Decoration, OMD) is to coat a decorative film comprising an adhesive layer, a decorative layer and a UV hardening transparent layer on a shell substrate by various molding processes such as hot pressing, air pressure, hydraulic pressure and the like, so as to realize the appearance effects of texture color or touch feeling on the surface of the shell substrate. The decorative film is arranged on the surface of the aluminum alloy through OMD, so that the technical effects of UV texture, optical coating, gradient color (spraying, offset printing, dip dyeing) and the like can be realized on the aluminum alloy shell substrate, the appearance expressive force of the existing product is greatly improved, and the appearance effect generated by OMD on the aluminum alloy is greatly distinguished from the appearance effect of aluminum alloy anodic oxidation.
Currently, the manufacturing process of the shell generally includes: and (3) CNC processing the base material, then injection molding plastic on the CNC-processed base material through NMT to form an integrally connected shell base body, and then carrying out subsequent processing on the shell base body.
However, when attaching a decorative film to a shell substrate, if this process requires a high temperature operation (e.g., a high temperature operation is typically required when attaching a decorative film to a shell substrate by OMD to create a desired appearance effect), a corresponding imprint is observed on the decorative film.
In addition, when the decorative film is attached to the case, even if the process of attaching the decorative film does not require a high temperature operation, the above-mentioned mark appears similarly in other processes of the subsequent processing if the high temperature operation is performed, and the appearance of the case product is affected.
The inventor finds that a preparation method of an aluminum alloy shell is available at present, and the technological process is approximately as follows: CNC processing of aluminum alloy substrate, carrying out T and handling once, then moulding plastics on the aluminum alloy substrate behind CNC through NMT, form the shell base member of body coupling, then CNC processing shell base member surface, polish this surface again, carry out secondary T and handle, increase the thickness of laminating glue when laminating the decorating film, CNC highlight chamfer again, carry out anodic oxidation to aluminum alloy at last. The flatness of the shell matrix before lamination is improved through polishing, and the imprint is relieved through increasing the thickness of laminating glue.
However, the inventors have tested in this way and found that the imprint 33 is still present on the prepared shell, as shown in fig. 3, with this method not being completely eliminated. Analyzing the reason: on one hand, due to the increase of the thickness of the bonding glue, the secondary T treatment is needed to be carried out for improving the bonding force between the base material and the bonding glue, and due to the fact that the T treatment only corrodes metal, the plastic layer is higher than the aluminum alloy, the thermal expansion volume of the laminated plastic layer is larger, and on the contrary, the impression can be generated on the decorative film more easily; on the other hand, the thickness of the glue is increased to reduce the hardness of the substrate of the decorative film, and when the product is subjected to roller test, the decorative film is easy to puncture, so that the reliability is affected.
In order to solve the problem that the above-mentioned problem of marking the decorative film is observed when the decorative film is laminated at a high temperature or after the decorative film is laminated, the inventors of the present invention have studied and analyzed to identify that the reason is: the plastic layer and the base material are different in material, so that the thermal expansion coefficients of the plastic layer and the base material are different at high temperature, so that the deformation degree of the decorative film attached to the plastic layer and the base material is different at high temperature, and further, an imprint is observed on the decorative film at a position corresponding to the joint region of the plastic layer and the base material. The technical scheme of the invention is further formed, and is specifically described by combining one embodiment of the invention as follows:
an embodiment of the invention provides a shell and a preparation method thereof, wherein the preparation method of the shell comprises the following steps:
s1, preparing a shell matrix, wherein in the embodiment, the prepared shell matrix is shown in FIG. 1, and the shell matrix comprises an aluminum alloy base material 11 and a plastic layer 12 integrally connected with the aluminum alloy base material 11. Specifically, the plastic layer 12 is integrally combined with the aluminum alloy substrate 11 through NMT.
It will be appreciated that before the plastic layer 12 is integrally combined with the aluminum alloy substrate 11 through NMT, the steps of CNC processing and T processing may be further included on the aluminum alloy substrate 11, where the T processing may form a pit on the surface of the aluminum alloy substrate, so as to facilitate subsequent plastic injection.
In this embodiment, the material of the substrate is an aluminum alloy, and in other embodiments, the material of the substrate may be at least one of a magnesium alloy, a titanium alloy, stainless steel, and glass fiber.
In addition, in this embodiment, the plastic layer is PPS (polyphenylene sulfide), and in other embodiments, the plastic layer may be PBT (polybutylene terephthalate), ABS (acrylonitrile butadiene styrene), PEI (polyetherimide), or the like.
S2, performing a plurality of offset treatments on the shell substrate, wherein each offset treatment comprises a step of fully expanding the base material and the plastic layer and performing heat curing on the surface of one side of the shell substrate with the plastic layer to form a coating, and a step of performing leveling polishing treatment on the surface of one side with the coating, and performing the offset treatments for a plurality of times until the coating after leveling polishing completely covers the joint area of the expanded base material and the plastic layer, so as to obtain a shell intermediate.
In the process of eliminating printing after forming the shell matrix integrally connected with the plastic layer and the base material, firstly, the thermal expansion of the plastic layer and the base material is released in advance through heat treatment; on the other hand thermally cured to form a coating. After the substrate and the plastic layer are sufficiently expanded and the surface is coated, the protrusions, including a portion of the coating that follows the thermal expansion of the substrate and the plastic layer, are removed by polishing until the surface is flat.
Specifically, the shell intermediate obtained by several reprinting treatments can be understood as: coating a coating on the surface of one side of the shell matrix with the plastic layer, heating the shell matrix, carrying out leveling polishing treatment on the surface of one side with the coating after the substrate and the plastic layer are heated and fully expanded, and carrying out heat curing on the coating to form the coating, and obtaining a shell intermediate if the rest coating is observed to fully cover the joint area of the substrate and the plastic layer after fully expansion; in this case, when the substrate and the plastic layer are again expanded by heat, the coating layer covering them can bear the deformation amount of the deformation of both, thereby ensuring that no corresponding imprint appears on the decorative film of the shell intermediate. If the rest coating is observed to not completely cover the joint area of the substrate and the plastic layer after the full expansion, in order to avoid the crack generated by the subsequently attached decorative film correspondingly under the influence of the joint area of the substrate and the plastic layer, continuing to perform the offset eliminating treatment until the coating completely covers the joint area of the substrate and the plastic layer, and obtaining the shell intermediate.
In this embodiment, the coating method is spraying.
In the present invention, the coating material used for the heat curing to form the coating layer satisfies the following conditions:
a) Forming a coating capable of being polished by said heat curing, and said heat curing requires a temperature capable of sufficiently expanding said substrate and said plastic layer;
b) Can be stable at the heat treatment temperature during the lamination of the decorative film and/or at other heat treatment temperatures after lamination of the decorative film and before the final shell is obtained.
Optionally, the coating has a solids content of 90% or less and its components comprise a polymer resin having urethane linkages.
Further alternatively, the main component of the coating comprises urethane acrylate, butyl acetate, ethyl acetate, a filler, an auxiliary agent, tertiary butanol, propylene glycol methyl ether and ethylene glycol butyl ether.
The filler is added into the coating to ensure that the surface dyne value of the coating is higher, so that the adhesive force between the coating and the subsequent adhesive glue meets the requirements of a hundred-cell test (generally required in the mobile phone industry, the 3M898 gummed paper is used for the hundred-cell test, and the grade is above 4B). The filler may be an alumina powder.
Still further alternatively, the urethane acrylate may have a mass fraction of 35-45%; the mass fraction of the butyl acetate can be 16-21%; the mass fraction of the ethyl acetate can be 10-15%; the mass fraction of the filler can be 5-10%; the mass fraction of the auxiliary agent can be 0.1-1%; the mass fraction of the tertiary butanol can be 1-6%; the mass fraction of the propylene glycol methyl ether can be 1-5%; the mass fraction of the ethylene glycol butyl ether can be 1-5%.
In the embodiment, the type of the coating is sokan BP 672-30000, which is from Songhu coating Co., ltd, has good acid and alkali resistance, and the coating cannot fall off in acid-base bath liquid of the subsequent aluminum alloy anodic oxidation process.
Alternatively, each time the offset treatment thermally cures to form a coating over the surface, the thickness of the applied coating is 30 μm to 50 μm.
Alternatively, the temperature of the heat treatment in each offset removal treatment may be 120 ℃ to 150 ℃. The coating thermally cures at the heat treatment temperature to form a coating, and the substrate and the plastic layer expand sufficiently at the heat treatment temperature.
Further alternatively, in the first offset removal process, the coating is applied multiple times over the surface and thermally cured to form a multilayer coating.
Still further alternatively, at the first offset treatment, two coats of paint are applied over the surface and thermally cured to form a two-layer coating. Firstly, through the operations of twice coating and twice heat curing, 60-100 mu m of coating is coated on the surface, on one hand, the purpose of coating thick coating is realized, and when polishing for the first time, the thicker coating is polished, so that the subsequent repeated times are reduced, and the coating completely covers the joint area of the base material and the plastic layer as soon as possible; on the other hand, the substrate and the plastic layer on the shell base are sufficiently thermally expanded.
Specifically, alternatively, a coating material is coated on the surface of one side of the shell substrate with the plastic layer for the first time, wherein the coating material is coated with a thickness of 30-50 μm, the first time is thermally cured to form a first coating layer, then a coating material is coated on the first coating layer for the second time, the coating material is coated with a thickness of 30-50 μm, and the second time is thermally cured to form a second coating layer; during the first and second thermal curing, the substrate and plastic layer on the shell substrate expand sufficiently, and the first and second coatings comprise the coating to be sanded.
Specifically, optionally, in the first offset removal treatment, the temperature of the first heat curing is 120-150 ℃, and the time of the first heat curing is 30 min-1 h; the temperature of the second heat curing is 120-150 ℃, and the time of the second heat curing is 30 min-1 h.
In this example, the surface of the side having the coating layer was polished with 800# sandpaper and 1500# sandpaper in this order, and the projections including a part of the coating layer following the thermal expansion of the substrate and the plastic layer were removed by polishing to the surface flatness.
In other embodiments, the method further comprises the step of applying a primer to the surface of the shell substrate prior to applying the coating on the surface of the shell substrate on the side having the plastic layer. Alternatively, the coating thickness of the treating agent is 5 μm to 10 μm. In these embodiments, a subsequent coating is applied over the treatment agent. The purpose of the coating treatment agent is to increase the adhesion of the subsequent coating to the surface of the substrate, the step can be optionally increased or not according to the surface condition of the substrate, and the treatment agent can contain ethyl acetate, butyl acetate and a solvent, wherein the sum of the mass percentages of the ethyl acetate and the butyl acetate in the treatment agent can be 70%.
In this embodiment, the number of times of the offset removal process further includes a step of performing dust cleaning and drying the cleaning agent on the product after the flat polishing process.
Specifically, the dust is generated by polishing, water can be selected to clean the dust, the dust is heated for 30min to 1h at the temperature of 120 to 150 ℃ after cleaning, the cleaning agent is dried, and the dried shell intermediate is shown in figure 4.
S3, attaching a decorative film to the dried shell intermediate to prepare the shell.
In this embodiment, the step of attaching the decorative film to the shell intermediate includes: a shell as shown in fig. 5 was prepared by attaching a decorative film to the shell intermediate by OMD.
Alternatively, the decorative film of the OMD has a laminated structure, which can be divided into a release structure and a non-release structure according to functions. As shown in fig. 6, the release structure includes an adhesive layer 601, a decorative layer 602, a transparent hardened layer 603, a release layer 604 and a receiving film 605 which are laminated in this order; as shown in fig. 7, the non-release structure includes an adhesive layer 701, a decorative layer 702, a transparent cured layer 703, and a receiving film 705, which are laminated in this order.
Further, the material of the carrier film 605 may be selected from PO, PET, CPP, A-PET, PP, PE, PC, OPP +pp, PMMA, OPP, and other films or composite films. The thickness of the carrier film 605 may be 0.02mm-0.05mm.
The material of the receiving film 705 may be selected from PET, PMMA, PC, PMMA +pc, MF, and other films or composite films. The thickness of the receiving film 705 may be 0.2mm to 0.4mm.
In some embodiments, the step of attaching a decorative film to the shell intermediate by OMD may be as follows:
preparing a shell intermediate and a decorative film, placing the shell intermediate and the decorative film in a mold of a molding machine, lowering an upper cavity of the mold to enable the decorative film to cover the shell intermediate, vacuumizing the upper cavity and the lower cavity, heating the shell intermediate and the decorative film to 80-150 ℃ for 3-5 min by IR, lifting a transfer platform to enable the shell intermediate to be lifted up after heating, attaching the shell intermediate to the decorative film, and then pressurizing the shell intermediate to 20-70kg/cm by atmospheric pressure 2 Air pressure 0-7kg/cm 2 Cooling after keeping for 2min, solidifying by UV, demoulding the product, removing the residual film, and finishing the lamination of the decorative film to realize the appearance effect.
Through OMD changes the decorative film, can realize technological effects such as UV texture, optical coating film on the casing, greatly promote the outward appearance expressive force of present product, increase product competitiveness.
In some embodiments, after the shell intermediate is laminated with the decorative film, the method further comprises the step of CNC machining and/or anodizing the product.
Optionally, the CNC machining process includes a CNC high gloss chamfering process.
Fig. 8 is a schematic view of a housing prepared by adding a CNC high-gloss chamfering process according to another embodiment of the present invention.
When the base material is an aluminum alloy base material, anodic oxidation treatment can be carried out, and the shell prepared by adopting the method can resist the problem that the decorative film is marked by high temperature in the step of anodic hole sealing in the anodic oxidation procedure, so that the influence of various high-temperature operations on the marking of the decorative film is avoided, and the good appearance of the product is ensured.
According to the method disclosed by the invention, the step of eliminating the printing treatment is added before the decoration film is attached, so that the phenomenon of the printing of the decoration film caused by the heat treatment process for attaching the decoration film can be eliminated, the phenomenon of the printing of the decoration film caused by the heat treatment of other subsequent processes after the decoration film is attached can be eliminated, and the attaching adhesive force after the decoration film is attached can also meet the test requirement of a hundred-grid test.
The invention also provides a shell. The shell comprises a shell substrate, a printing eliminating layer and a decorative film which are sequentially laminated;
the shell matrix comprises a base material and a plastic layer integrally connected with the base material;
the seal eliminating layer completely covers the joint area of the base material and the plastic layer, and the surface of one side, which is contacted with the decorative film, of the seal eliminating layer is flat.
In the structure of the shell, the seal eliminating layer is arranged between the shell substrate and the decorative film, and when the substrate and the plastic layer on the shell substrate are heated and expanded, the seal eliminating layer can bear the deformation of the substrate and the plastic layer, thereby being beneficial to eliminating the seal; and the seal eliminating layer and the decorative film completely cover the joint area of the base material and the plastic layer, thereby being beneficial to avoiding the crack corresponding to the decorative film attached later.
The material of a layer different from the decorative film of the OMD is that the print eliminating layer is arranged between the shell substrate and the decorative film and is used for bearing the deformation amount of the deformation of the substrate and the plastic layer on the shell substrate when the substrate and the plastic layer are expanded by heating, so that the print eliminating layer is essentially different from the functions of each functional layer of the decorative film of the OMD.
Optionally, the print-eliminating layer is a coating.
In one embodiment, a surface of a side of the overprint layer in contact with the decorative film is flat, and a surface of a side of the overprint layer in contact with the shell substrate is uneven. The flat and uneven surfaces of the offset layer are produced by several offset treatments.
Optionally, the offset layer is formed by performing an offset treatment several times, each of which includes a step of thermally curing the substrate and the plastic layer over a surface of the case base having the plastic layer to form a coating layer, and a step of performing a leveling polishing treatment on the surface of the side having the coating layer.
By heat treatment, on one hand, the thermal expansion of the plastic layer and the base material is released in advance; on the other hand thermally cured to form a coating. After the substrate and plastic layer have been sufficiently expanded and the surface has been coated, the protrusions, including a portion of the coating that follows the thermal expansion of the substrate and plastic layer, are removed by grinding. When the base material and the plastic layer are heated and expanded again, the coating covered on the base material and the plastic layer can bear the deformation quantity of the deformation of the base material and the plastic layer, so that the corresponding mark is no longer generated on the decorative film of the shell intermediate.
Optionally, the coating used for the heat curing to form the coating satisfies the following conditions:
a) Forming a coating capable of being polished by said heat curing, and said heat curing requires a temperature capable of sufficiently expanding said substrate and said plastic layer;
b) Can be stable at the heat treatment temperature during the lamination of the decorative film and/or at other heat treatment temperatures after lamination of the decorative film and before the final shell is obtained.
Further alternatively, the solid content of the coating is 90% or less, and the component thereof comprises a polymer resin having a urethane bond.
Still further alternatively, the major components of the coating comprise urethane acrylate, butyl acetate, ethyl acetate, fillers, adjuvants, t-butanol, propylene glycol methyl ether, and ethylene glycol butyl ether.
Optionally, the housing further comprises a primer layer between the shell substrate and the print-eliminating layer.
Further alternatively, the material used for the primer layer is a treating agent.
The material of the base material of the housing may be at least one selected from aluminum alloy, magnesium alloy, stainless steel and glass fiber. The obtained shell can be an aluminum-plastic product which is formed through OMD and has no impression, so that the problem that similar materials such as aluminum-plastic can not be formed through OMD is solved, and OMD metal integration becomes reality.
The invention also provides electronic equipment, which comprises a display screen and the shell, wherein the shell is provided with an accommodating space, and the display screen is arranged in the accommodating space. The metal integrated electronic equipment (such as a mobile phone) can be designed by combining with the OMD, so that the antenna structure can not be seen from the appearance surface of the electronic equipment while the antenna requirement is met, and the metal integrated electronic equipment belongs to innovation of a new form.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (14)
1. A method of manufacturing a shell, comprising the steps of:
providing a shell matrix, wherein the shell matrix comprises a base material and a plastic layer integrally connected with the base material;
performing a number of offset treatments on the shell substrate, each of the offset treatments comprising a step of thermally curing the substrate and the plastic layer over a surface of the shell substrate having the plastic layer to form a coating, and a step of performing a leveling polishing treatment on the surface of the shell substrate having the coating, the offset treatments being performed a number of times until the leveling polished coating completely covers a joint region of the substrate and the plastic layer after the expansion, to obtain a shell intermediate;
and attaching a decorative film to the shell intermediate.
2. The method of producing a housing according to claim 1, wherein the coating material used for the heat curing to form the coating layer satisfies the following conditions:
a) Forming a coating capable of being polished by said heat curing, and said heat curing requires a temperature capable of sufficiently expanding said substrate and said plastic layer;
b) Can be stable at the heat treatment temperature during the lamination of the decorative film and/or at other heat treatment temperatures after lamination of the decorative film and before the final shell is obtained.
3. The method for producing a shell according to claim 2, wherein the solid content of the coating material is 90% or less, and the component thereof comprises a polymer resin having a urethane bond.
4. A method of producing a shell according to claim 3, wherein the main component of the paint comprises urethane acrylate, butyl acetate, ethyl acetate, filler, auxiliary agent, t-butanol, propylene glycol methyl ether and ethylene glycol butyl ether.
5. The method according to any one of claims 1 to 4, wherein the thickness of the coating material is 30 μm to 50 μm when the offset coating treatment is thermally cured on the surface to form a coating layer each time.
6. The method of producing a housing according to claim 5, wherein the coating is applied and thermally cured a plurality of times over the surface to form a multilayer coating at the time of the first offset removal treatment.
7. The method of manufacturing a case according to any one of claims 1 to 4 and 6, further comprising the step of applying a treating agent to a surface of the case base on the side having the plastic layer to form an undercoat layer, before performing the offset treatment several times on the case base.
8. The method for manufacturing a shell according to any one of claims 1 to 4 and 6, wherein the number of the offset removal processes further includes the steps of dust cleaning and drying the product after the flattening polishing process.
9. The method for manufacturing a housing according to any one of claims 1 to 4 and 6, wherein the material of the base material is at least one selected from the group consisting of aluminum alloy, magnesium alloy, titanium alloy, stainless steel and glass fiber.
10. The method for manufacturing a housing according to any one of claims 1 to 4 and 6, wherein the plastic layer is integrally connected to the base material by a nano injection molding process.
11. The method for manufacturing a shell according to any one of claims 1 to 4 and 6, wherein the step of attaching a decorative film to the shell intermediate comprises: and attaching the decorative film on the shell intermediate through an external film decoration process.
12. The method of any one of claims 1 to 4 and 6, further comprising CNC processing and/or anodic oxidation of the product after the shell intermediate is bonded to the decorative film.
13. A casing prepared by the preparation method of any one of claims 1 to 12, comprising a casing base, a print eliminating layer and a decorative film laminated in this order;
the shell matrix comprises a base material and a plastic layer integrally connected with the base material;
the seal eliminating layer completely covers the joint area of the base material and the plastic layer, and the surface of one side, which is contacted with the decorative film, of the seal eliminating layer is flat.
14. An electronic device comprising a display screen and the housing of claim 13, the housing defining a receiving space therein, the display screen being disposed in the receiving space.
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