CN114340264A - Shell, preparation method thereof and electronic equipment - Google Patents
Shell, preparation method thereof and electronic equipment Download PDFInfo
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- CN114340264A CN114340264A CN202111671616.8A CN202111671616A CN114340264A CN 114340264 A CN114340264 A CN 114340264A CN 202111671616 A CN202111671616 A CN 202111671616A CN 114340264 A CN114340264 A CN 114340264A
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Abstract
The invention relates to the technical field of electronic equipment manufacturing, in particular to a shell, a preparation method of the shell and electronic equipment. The shell base body comprises a base material and a plastic layer integrally connected with the base material; the joint area of the base material and the plastic layer is completely covered by the mark eliminating layer, and the surface of one side of the mark eliminating layer, which is in contact with the decorative film, is flat. The shell is beneficial to improving the problem of the impression 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 preparation method of the shell and electronic equipment.
Background
At present, the preparation process of the shell generally comprises the following steps: CNC processing of the base material, injection Molding of plastic on the CNC-processed base material through Nano-Molding Technology (NMT) to form an integrally connected shell base body, and subsequent processing of the shell base body.
However, when the Decoration film is attached to the case base, if this process requires a high temperature operation (for example, a high temperature operation is generally required when attaching the Decoration film to the case base by an Out Mold Decoration (OMD) technique to form a desired appearance effect), a corresponding mark is observed on the Decoration 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 the casing formed after the decoration film is attached to the casing substrate, wherein 23 is an impression on the decoration film corresponding to the bonding area of the plastic layer and the substrate, and the appearance of the impression affects the appearance of the casing product.
In addition, after the decoration film is attached to the housing, even though the process of attaching the decoration film does not require a high temperature operation, the above-mentioned marks may appear if the high temperature operation is performed in other processes of the subsequent processing, which may affect the appearance of the housing product.
Disclosure of Invention
Accordingly, the invention provides a housing, a manufacturing method thereof and an electronic device, which can solve the problem of imprint on a decorative film at high temperature.
The technical scheme for solving the technical problems is as follows:
a shell comprises a shell base body, an offset printing layer and a decorative film which are sequentially stacked;
the shell base body comprises a base material and a plastic layer integrally connected with the base material;
the joint area of the base material and the plastic layer is completely covered by the mark eliminating layer, and the surface of one side of the mark eliminating layer, which is in contact with the decorative film, is flat.
The invention also provides a preparation method of the shell, which comprises the following steps:
providing a shell base body, wherein the shell base body comprises a base material and a plastic layer integrally connected with the base material;
performing a plurality of times of stamp removing treatments on the shell substrate, wherein each time of stamp removing treatment comprises a heat treatment step of enabling the substrate and the plastic layer to fully expand and thermally cure to form a coating on one side surface of the shell substrate with the plastic layer, and a step of performing leveling and polishing treatment on one side surface with the coating, and performing the stamp removing treatments for a plurality of times until the coating after leveling and polishing completely covers a joint area of the expanded substrate and the plastic layer to obtain a shell intermediate;
and attaching a decorative film to the shell intermediate.
The invention also provides electronic equipment which comprises the display screen and the shell, wherein the shell is defined 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 view of the problem that the decoration film is adhered at a high temperature or the high-temperature treatment is performed after the decoration film is adhered, the inventors of the present invention have determined through research and analysis that the reason is that: the plastic layer and the substrate are made of different materials, so that the thermal expansion coefficients of the plastic layer and the substrate are different at high temperature, the deformation degree of the decorative film attached to the plastic layer and the substrate is different at high temperature, and then the mark is observed on the decorative film at the position corresponding to the joint area of the plastic layer and the substrate.
In the structure of the shell, the stamp eliminating layer is arranged between the shell substrate and the decorative film, and when the base material and the plastic layer on the shell substrate expand due to heating, the stamp eliminating layer can bear deformation of the base material and the plastic layer, so that the stamp eliminating is facilitated; and the joint area of the substrate and the plastic layer is completely covered by the print eliminating layer and the decorative film, so that cracks generated in the subsequently attached decorative film correspondingly can be avoided.
According to the preparation method of the shell, after the shell base body integrally connected with the plastic layer and the base material is formed, the shell base body is subjected to the printing elimination treatment for a plurality of times, the printing elimination treatment comprises the steps of heat treatment and flattening and polishing treatment, and on one hand, the thermal expansion of the plastic layer and the base material is released in advance through the heat treatment; on the other hand, heat curing forms a coating. And after the substrate and the plastic layer are fully expanded and the coating is formed on the surface, removing projections including 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 a shell intermediate if the residual coating is observed to completely cover the joint area of the substrate and the plastic layer which are fully expanded. In this case, when the substrate and the plastic layer expand again by heating, the coating layer covering them can withstand the deformation of both, thus ensuring that no corresponding imprint appears on the decorative film of the shell intermediate. If the surface is flat, the residual coating is observed not to completely cover the bonding area of the base material and the plastic layer after full expansion, and in order to avoid cracks generated correspondingly in the subsequently attached decorative film under the influence of the bonding area of the base material and the plastic layer, the invention continues to perform the mark eliminating treatment until the coating completely covers the bonding area of the base material and the plastic layer to obtain a shell intermediate, and then the decorative film is attached to prepare the shell.
Drawings
FIG. 1 is a diagram of the actual effect of a shell substrate;
FIG. 2 is a diagram illustrating the actual effect of the impression generated by the high temperature lamination of the decoration film in the conventional method;
FIG. 3 is a diagram showing the actual effect of a shell manufactured by a method for improving imprint;
FIG. 4 is a diagram illustrating the practical effects of the intermediate housing body according to an embodiment;
FIG. 5 is a diagram illustrating the practical effects of the housing according to an embodiment;
FIG. 6 is a schematic view of a release structure of the decorative film;
FIG. 7 is a schematic view of a release-free structure of the decorative film;
fig. 8 is a diagram showing the practical effects of the housing according to 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 in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Term(s) for
Unless otherwise stated or contradicted, terms or phrases used herein have the following meanings:
as used herein, the term "and/or", "and/or" includes any one of two or more of the associated listed items, as well as any and all combinations of the associated listed items, including any two of the associated listed items, any more of the associated listed items, or all combinations of the associated listed items.
In the present invention, the technical features described in the open type include a closed technical solution composed of the listed features, and also include an open technical solution including the listed features.
In the present invention, the directions or positional relationships 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 based on the directions or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not 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 defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise
In the present invention, the terms "mounted," "connected," and "fixed" should be understood in a broad sense, for example, they may be fixedly connected, or detachably connected, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, the first feature may be directly on or directly under the second feature, or the first and second features may be indirectly on or directly under each other through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It should also be understood that in explaining the connection relationship or the positional relationship of the elements, although not explicitly described, the connection relationship and the positional relationship are interpreted to include an error range which should be within an acceptable deviation range of a specific value determined by those skilled in the art. For example, "about," "approximately," or "substantially" may mean within one or more standard deviations, without limitation.
In the present invention, the numerical range is defined to include both end points of the numerical range 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 certain temperature range. The constant temperature process allows the temperature to fluctuate within the accuracy of the instrument control.
Nano Molding Technology (NMT) is a technique for directly injecting plastic onto a substrate to join a plastic layer to a substrate made of a different material.
The Outside Mold Decoration (OMD) technology is to coat a decorative film including an adhesive layer, a transfer layer, and a UV-hardening transparent layer on a case base by various molding processes such as hot pressing, air pressure, hydraulic pressure, etc., to realize an appearance effect such as a texture color or touch on the surface of the case base. The decorative film is arranged on the surface of the aluminum alloy through OMD (open metering and printing) transfer decoration, technological effects such as UV textures, optical coating films, gradient colors (spraying, offset printing, printing and dip dyeing) and the like can be realized on an aluminum alloy shell base body, 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.
At present, the preparation process of the shell generally comprises the following steps: the CNC of substrate is processed, then moulds plastics the plastic on the substrate behind the CNC through NMT, forms the shell base member of body coupling, then carries out subsequent processing to the shell base member.
However, when applying the decorative film to the housing substrate, if this process requires a high temperature operation (for example, a high temperature operation is usually required when applying the decorative film to the housing substrate by the OMD to form a desired appearance), a corresponding mark is observed on the decorative film.
In addition, after the decoration film is attached to the housing, even though the process of attaching the decoration film does not require a high temperature operation, the above-mentioned marks may appear if the high temperature operation is performed in other processes of the subsequent processing, which may affect the appearance of the housing product.
The inventor finds that the process flow of the preparation method of the aluminum alloy shell is as follows: aluminum alloy substrate CNC processing carries out once T and handles, then moulds plastics the plastic through NMT on the aluminum alloy substrate behind CNC, forms the shell base member of a body coupling, then CNC processing shell base member surface, this surface of polishing again carries out secondary T and handles, increases the thickness of laminating glue during the laminating decorative film, and CNC highlight chamfer again carries out anodic oxidation to the aluminum alloy at last. Improve the roughness before the laminating of shell base member through polishing, the impression is alleviateed to the thickness that rethread increased laminating glue.
However, the inventors have conducted experiments according to this method and found that the imprint cannot be completely eliminated by this method, and as shown in fig. 3, the imprint 33 still exists on the prepared housing. The reason is analyzed: on one hand, because the thickness of the bonding glue is increased, secondary T treatment is required to be added for improving the bonding force between the base material and the bonding glue, and because the T treatment only corrodes metal, the plastic layer is higher than the aluminum alloy, the thermal expansion volume of the superposed plastic layer is larger, and instead, marks are more easily generated on the decorative film; on the other hand, the increase of the thickness of the glue can cause the substrate hardness of the decorative film to be reduced, and when the product is subjected to roller test, the decorative film is easy to pierce, so that the reliability is influenced.
In view of the above-mentioned problem that the adhesion of the decorative film at a high temperature or the high-temperature treatment after the adhesion of the decorative film causes the impression observed on the decorative film, the inventors of the present invention have conducted research and analysis to find that the reason is: the plastic layer and the substrate are made of different materials, so that the thermal expansion coefficients of the plastic layer and the substrate are different at high temperature, the deformation degree of the decorative film attached to the plastic layer and the substrate is different at high temperature, and then the mark is observed on the decorative film at the position corresponding to the joint area of the plastic layer and the substrate. Further, the technical solution of the present invention is specifically described below with reference to an embodiment of the present invention:
one 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 base, in this embodiment, the prepared shell base is as shown in fig. 1, and the shell base includes an aluminum alloy substrate 11 and a plastic layer 12 integrally connected to the aluminum alloy substrate 11. Specifically, the plastic layer 12 is compounded with the aluminum alloy substrate 11 into a whole through NMT.
It is understood that before the plastic layer 12 is compounded into a whole with the aluminum alloy substrate 11 by NMT, a step of CNC machining and T treatment may be further included to the aluminum alloy substrate 11, wherein the T treatment may form pits on the surface of the aluminum alloy substrate to facilitate subsequent plastic injection molding.
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 the present embodiment, the material of the plastic layer is PPS (polyphenylene sulfide), and in other embodiments, the material of the plastic layer may be PBT (polybutylene terephthalate), ABS (acrylonitrile-butadiene-styrene copolymer), PEI (polyetherimide), or the like.
S2, conducting multiple times of offset printing treatment on the shell base body, wherein each time of offset printing treatment comprises a step of heat treatment for enabling the base material and the plastic layer to fully expand and thermally curing the base material and the plastic layer on one side surface of the shell base body with the plastic layer to form a coating, and a step of carrying out flat grinding treatment on one side surface with the coating, and conducting multiple times of offset printing treatment until the coating after flat grinding completely covers the joint area of the expanded base material and the plastic layer, so as to obtain a shell intermediate.
In the de-printing treatment after the shell base body integrally connected with the plastic layer and the base material is formed, firstly, the thermal expansion of the plastic layer and the base material is released in advance through the thermal treatment; on the other hand, heat curing forms a coating. After the substrate and the plastic layer are fully expanded and the coating is formed on the surface, removing projections including a part of the coating which is thermally expanded along with the substrate and the plastic layer by polishing until the surface is flat.
In particular, the shell intermediate obtained by several offset processes can be understood as: coating a coating on the surface of one side of the shell substrate with the plastic layer, heating the shell substrate, after the substrate and the plastic layer are heated and fully expanded and the coating is thermally cured to form a coating, carrying out flat polishing treatment on the surface of one side with the coating, and obtaining a shell intermediate if the residual coating completely covers the joint area of the substrate and the plastic layer after full expansion; in this case, when the substrate and the plastic layer expand again by heating, the coating layer covering them can withstand the deformation of both, thus ensuring that no corresponding imprint appears on the decorative film of the shell intermediate. If the residual coating is observed not to completely cover the fully expanded bonding area of the substrate and the plastic layer, in order to avoid the corresponding crack of the subsequently attached decorative film under the influence of the bonding area of the substrate and the plastic layer, the offset printing treatment is continued until the coating completely covers the bonding area of the substrate and the plastic layer, and the shell intermediate is obtained.
In this embodiment, the coating method is spraying.
In the present invention, the coating material used for forming the coating layer by the thermal curing satisfies the following conditions:
a) forming a coating capable of being polished by the thermal curing, wherein the temperature required by the thermal curing can enable the substrate and the plastic layer to be fully expanded;
b) the performance can be stabilized at the heat treatment temperature during the application of the decorative film and/or at other heat treatment temperatures after the application 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 include a polymer resin having urethane bonds.
Further optionally, the major components of the coating comprise urethane acrylate, butyl acetate, ethyl acetate, filler, adjuvant, t-butyl alcohol, propylene glycol methyl ether, and ethylene glycol butyl ether.
The filler is added into the coating, so that the surface dyne value of the coating can be ensured to be higher, and the bonding force between the coating and subsequent adhesive reaches the requirement of a check test (generally, the requirement of the mobile phone industry is that a check test is carried out by using 3M898 adhesive paper, and the grade is more than 4B). The filler may be alumina powder.
Still further alternatively, the mass fraction of the urethane acrylate may be 35-45%; the mass fraction of 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 this embodiment, the coating is sokan BP 672-.
Optionally, each time the offset printing process forms a coating by thermal curing on the surface, the thickness of the coating paint is 30 μm to 50 μm.
Alternatively, the temperature of the heat treatment in each offset printing process may be 120 to 150 ℃. The coating is thermally cured at the heat treatment temperature to form a coating, and the substrate and the plastic layer are fully expanded at the heat treatment temperature.
Further optionally, multiple applications of coating and heat curing are performed on the surface to form a multi-layer coating upon the first offset process.
Still further alternatively, in the first offset process, coating is applied twice and heat cured twice over the surface to form a two-layer coating. Firstly, coating 60-100 mu m of coating on the surface through two coating and two thermosetting operations, on one hand, the aim of coating thick coating is realized, and when the coating is polished for the first time, the thicker coating is polished, so that the subsequent repeated times are reduced, and the coating can completely cover 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 case base are sufficiently thermally expanded.
Specifically, optionally, coating a coating on the surface of the shell substrate with the plastic layer for the first time to form a first coating with a thickness of 30 μm to 50 μm, performing first heat curing to form a first coating, and then coating a coating on the first coating for the second time to form a second coating with a thickness of 30 μm to 50 μm, and performing second heat curing to form a second coating; and in the processes of primary heat curing and secondary heat curing, the base material and the plastic layer on the shell substrate are fully expanded, and the first coating and the second coating form a coating to be polished.
Specifically, optionally, during the first offset printing treatment, the temperature of the first thermal curing is 120-150 ℃, and the time of the first thermal 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, one side surface having the coating layer was polished with 800# sandpaper and 1500# sandpaper in this order, and projections including a part of the coating layer following thermal expansion of the substrate and the plastic layer were removed by polishing until the surface was flat.
In other embodiments, before coating the coating on the surface of the shell substrate having the plastic layer, a step of coating a primer on the surface is further included. Optionally, the treating agent is coated to a thickness of 5 μm to 10 μm. In these examples, a subsequent coating is applied over the treating agent. The coating treatment agent is added to increase the adhesion between a subsequent coating and the surface of the base material, the step can be increased or not increased according to the surface condition of the base material, and the treatment agent can contain ethyl acetate, butyl acetate and a solvent, wherein the sum of the mass fractions of the ethyl acetate and the butyl acetate in the treatment agent can be 70%.
In this embodiment, the offset printing process further includes the steps 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, after cleaning, the shell is heated for 30min to 1h at the temperature of 120 ℃ to 150 ℃, the cleaning agent is dried, and the dried shell intermediate is shown in fig. 4.
And S3, adhering a decorative film to the dried shell intermediate to prepare the shell.
In this embodiment, the step of attaching the decorative film to the case intermediate includes: a decorative film was attached to the shell intermediate by an OMD to prepare a shell as shown in fig. 5.
Alternatively, the decorative film of the OMD has a laminate structure, and may be classified into a release type structure and a non-release type structure according to functions. As shown in fig. 6, the release structure includes an adhesive layer 601, a decoration layer 602, a transparent hardened layer 603, a release layer 604, and a receiving film 605, which are sequentially stacked; as shown in fig. 7, the non-release structure includes an adhesive layer 701, a decorative layer 702, a transparent hardened layer 703, and a receiving film 705, which are sequentially stacked.
Further, the material of the carrier film 605 may be selected from films or composite films such as PO, PET, CPP, a-PET, PP, PE, PC, OPP + PP, PMMA, and OPP. The thickness of the carrier film 605 may be 0.02mm to 0.05 mm.
The material of the receiving film 705 may be selected from PET, PMMA, PC, PMMA + PC, MF, or other film materials or composite film materials. The thickness of the receptor membrane 705 may be 0.2mm to 0.4 mm.
In some embodiments, the step of applying a decorative film to the shell intermediate via the OMD may be as follows:
preparing a case intermediate and a decorative filmThe transfer platform is arranged in a mold of a forming machine, the upper cavity of the mold descends to enable the decorative film to coat the shell intermediate body, the upper cavity and the lower cavity are vacuumized, the IR is heated to the temperature of 80-150 ℃ in the cavity and the heating time is 3-5 min, after heating, the transfer platform rises to enable the shell intermediate body to be jacked and attached to the decorative film, and then the atmospheric pressure is 20-70kg/cm2Air pressure of 0-7kg/cm2And cooling after keeping for 2min, then performing UV curing, then demolding and taking out the product, cutting off the residual film, finishing the lamination of the decorative film and realizing the appearance effect.
The decorative film is decorated through the OMD, technological effects such as UV textures, optical coating and the like can be realized on the shell, appearance expressive force of the existing product is greatly improved, and product competitiveness is increased.
In some embodiments, after the decoration film is attached to the shell intermediate, a step of performing CNC machining and/or anodizing on the product is further included.
Optionally, the CNC machining process comprises a CNC high gloss chamfering process.
Fig. 8 is a schematic view of a housing prepared by adding a CNC high light chamfering process according to another embodiment of the present invention.
When the base material is an aluminum alloy base material, the anodic oxidation treatment can also be carried out, and the shell prepared by the method can also resist the problem that the decorative film is marked due to high temperature in the step of sealing the hole by the anode in the anodic oxidation process, thereby avoiding the influence of various high-temperature operations on the marking of the decorative film and ensuring the good appearance of the product.
According to the method, the step of the mark eliminating treatment is added before the decoration film is attached, so that not only can the mark phenomenon of the decoration film caused by the heat treatment process of attaching the decoration film be eliminated, but also the mark phenomenon of the decoration film caused by the heat treatment of other subsequent processes after the decoration film is attached can be eliminated, and the attachment adhesive force after the decoration film is attached can also meet the requirement of a hundred-grid test.
The invention also provides a shell. The shell comprises a shell base body, a print eliminating layer and a decorative film which are sequentially stacked;
the shell base body comprises a base material and a plastic layer integrally connected with the base material;
the joint area of the base material and the plastic layer is completely covered by the mark eliminating layer, and the surface of one side of the mark eliminating layer, which is in contact with the decorative film, is flat.
In the structure of the shell, the stamp eliminating layer is arranged between the shell substrate and the decorative film, and when the base material and the plastic layer on the shell substrate expand under heat, the stamp eliminating layer can bear deformation of the base material and the plastic layer, so that the stamp eliminating is facilitated; and the joint area of the substrate and the plastic layer is completely covered by the print eliminating layer and the decorative film, so that cracks generated in the subsequently attached decorative film correspondingly can be avoided.
The print erasing layer is arranged between the shell base body and the decorative film and is used for bearing deformation of the base material and the plastic layer on the shell base body when the base material and the plastic layer expand under heat, so that the functions of the print erasing layer and each functional layer of the decorative film of the OMD are essentially different.
Optionally, the print-reducing layer is a coating.
In one embodiment, the surface of the side of the offset layer, which is in contact with the decorative film, is flat, and the surface of the side of the offset layer, which is in contact with the shell substrate, is not flat. The flat and uneven surface of the print-reducing layer is produced by several print-reducing treatments.
Optionally, the print-eliminating layer is formed by performing a plurality of print-eliminating treatments, each of the print-eliminating treatments including a heat treatment step of sufficiently expanding the substrate and the plastic layer and thermosetting the substrate and forming a coating on the surface of the shell base body having the plastic layer, and a step of performing a flat-grinding treatment on the surface of the side having the coating.
Through heat treatment, on one hand, the thermal expansion of the plastic layer and the substrate is released in advance; on the other hand, heat curing forms a coating. After the substrate and the plastic layer are fully expanded and the coating is formed on the surface, the projections including a part of the coating which is thermally expanded along with the substrate and the plastic layer are removed by polishing. When the substrate and the plastic layer expand again by heating, the coating layer covered on the substrate and the plastic layer can bear the deformation amount of the deformation of the substrate and the plastic layer, so that the decorative film of the shell intermediate body is ensured not to have corresponding marks.
Optionally, the coating used for forming the coating by thermal curing satisfies the following conditions:
a) forming a coating capable of being polished by the thermal curing, wherein the temperature required by the thermal curing can enable the substrate and the plastic layer to be fully expanded;
b) the performance can be stabilized at the heat treatment temperature during the application of the decorative film and/or at other heat treatment temperatures after the application of the decorative film and before the final shell is obtained.
Further optionally, the coating has a solids content of 90% or less and its components comprise a polymer resin having urethane bonds.
Still further optionally, the primary component of the coating comprises urethane acrylate, butyl acetate, ethyl acetate, filler, adjuvant, t-butyl alcohol, propylene glycol methyl ether, and ethylene glycol butyl ether.
Optionally, the housing further comprises a primer layer, the primer layer being located between the housing substrate and the print-reducing layer.
Further optionally, the material used for the primer layer is a treating agent.
The material of the base material of the shell can be at least one of aluminum alloy, magnesium alloy, stainless steel and glass fiber. The obtained shell can be an aluminum-plastic product which is formed by OMD and has no mark, the problem that similar materials such as aluminum and plastic cannot be formed by OMD is solved, and the OMD metal integration is realized.
The invention also provides electronic equipment which comprises the display screen and the shell, wherein the shell is defined with an accommodating space, and the display screen is arranged in the accommodating space. The OMD is combined to design the metal integrated electronic equipment (such as a mobile phone), the antenna structure cannot be seen from the appearance 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 embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (22)
1. A shell is characterized by comprising a shell base body, a printing eliminating layer and a decorative film which are sequentially stacked;
the shell base body comprises a base material and a plastic layer integrally connected with the base material;
the joint area of the base material and the plastic layer is completely covered by the mark eliminating layer, and the surface of one side of the mark eliminating layer, which is in contact with the decorative film, is flat.
2. The housing of claim 1, wherein the print-reducing layer is a coating.
3. The housing according to claim 2, wherein the print-eliminating layer is formed by performing a plurality of print-eliminating treatments, each of the print-eliminating treatments including a heat treatment step of causing the substrate and the plastic layer to sufficiently expand and thermally cure to form a coating on the side surface of the housing base having the plastic layer, and a step of performing a flat-grinding treatment on the side surface having the coating.
4. The housing according to claim 3, wherein the coating used for the thermal curing to form the coating layer satisfies the following conditions:
a) forming a coating capable of being polished by the thermal curing, wherein the temperature required by the thermal curing can enable the substrate and the plastic layer to be fully expanded;
b) the performance can be stabilized at the heat treatment temperature during the application of the decorative film and/or at other heat treatment temperatures after the application of the decorative film and before the final shell is obtained.
5. The housing according to claim 4, wherein the coating has a solid content of 90% or less and the components thereof include a polymer resin having a urethane bond.
6. The housing of claim 5, wherein the major components of the coating comprise urethane acrylate, butyl acetate, ethyl acetate, fillers, adjuvants, t-butyl alcohol, propylene glycol methyl ether, and ethylene glycol butyl ether.
7. The housing of any of claims 1 to 6, further comprising a primer layer, the primer layer being located between the housing substrate and the print-reducing layer.
8. The housing of claim 7, wherein the primer layer is a treatment agent.
9. The housing according to any one of claims 1 to 6, wherein 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. A method for preparing a shell is characterized by comprising the following steps:
providing a shell base body, wherein the shell base body comprises a base material and a plastic layer integrally connected with the base material;
performing a plurality of times of stamp removing treatments on the shell substrate, wherein each time of stamp removing treatment comprises a heat treatment step of enabling the substrate and the plastic layer to fully expand and thermally cure to form a coating on one side surface of the shell substrate with the plastic layer, and a step of performing leveling and polishing treatment on one side surface with the coating, and performing the stamp removing treatments for a plurality of times until the coating after leveling and polishing completely covers a joint area of the expanded substrate and the plastic layer to obtain a shell intermediate;
and attaching a decorative film to the shell intermediate.
11. The method for manufacturing a housing according to claim 8, wherein the coating material used for forming the coating layer by thermal curing satisfies the following conditions:
a) forming a coating capable of being polished by the thermal curing, wherein the temperature required by the thermal curing can enable the substrate and the plastic layer to be fully expanded;
b) the performance can be stabilized at the heat treatment temperature during the application of the decorative film and/or at other heat treatment temperatures after the application of the decorative film and before the final shell is obtained.
12. The method of manufacturing a housing according to claim 11, wherein the coating material has a solid content of 90% or less and a component containing a polymer resin having a urethane bond.
13. The method of manufacturing a housing according to claim 12, wherein the main component of the paint comprises urethane acrylate, butyl acetate, ethyl acetate, a filler, an auxiliary, t-butyl alcohol, propylene glycol methyl ether, and ethylene glycol butyl ether.
14. A method of manufacturing a casing according to any one of claims 10 to 13 wherein each time the offset printing process thermally cures to form a coating on the surface, the thickness of the applied coating is in the range 30 μm to 50 μm.
15. The method of manufacturing a housing according to claim 14, wherein, at the first offset printing process, coating and heat curing are performed a plurality of times on the surface to form a multi-layer coating.
16. The method for manufacturing a housing according to any one of claims 10 to 13 and 15, further comprising a step of applying a treatment agent to a surface of the housing substrate having the plastic layer to form a primer layer before the plurality of times of the offset printing treatment is performed on the housing substrate.
17. The preparation method of the shell according to any one of claims 10 to 13 and 15, wherein the offset printing treatment for a plurality of times further comprises the steps of performing dust cleaning and drying cleaning agent on the product after the flat grinding treatment.
18. The method of manufacturing a housing according to any one of claims 10 to 13 and 15, wherein the base material is at least one selected from the group consisting of aluminum alloy, magnesium alloy, titanium alloy, stainless steel, and glass fiber.
19. The method for manufacturing a housing according to any one of claims 10 to 13 and 15, wherein the plastic layer is integrally connected to the substrate by a nano-injection molding process.
20. The method for manufacturing a case according to any one of claims 10 to 13 and 15, wherein the step of attaching a decorative film to the case intermediate includes: and adhering the decorative film on the shell intermediate body through an outer film decoration process.
21. The method for manufacturing a housing according to any one of claims 10 to 13 and 15, further comprising a step of performing CNC machining and/or anodizing on the product after the housing intermediate is attached to the decoration film.
22. An electronic device, comprising a display screen and the housing according to any one of claims 1 to 9, wherein an accommodating space is defined in the housing, and the display screen is disposed in the accommodating space.
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