CN114683604A - Preparation method of plastic mobile phone front cover - Google Patents
Preparation method of plastic mobile phone front cover Download PDFInfo
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- CN114683604A CN114683604A CN202011624430.2A CN202011624430A CN114683604A CN 114683604 A CN114683604 A CN 114683604A CN 202011624430 A CN202011624430 A CN 202011624430A CN 114683604 A CN114683604 A CN 114683604A
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- mobile phone
- front cover
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D99/00—Subject matter not provided for in other groups of this subclass
- B29D99/006—Producing casings, e.g. accumulator cases
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
- H04M1/0279—Improving the user comfort or ergonomics
- H04M1/0283—Improving the user comfort or ergonomics for providing a decorative aspect, e.g. customization of casings, exchangeable faceplate
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Abstract
The invention discloses a preparation method of a plastic mobile phone front cover, compared with the prior art, the produced plastic mobile phone front cover is characterized in that hole sites (7) for mounting a camera are arranged on the plastic mobile phone front cover (6), reinforcing ribs (8) which are fixedly connected are arranged at four corners and four sides of the plastic mobile phone front cover (6), the reinforcing ribs (8) and the plastic mobile phone front cover (6) are fixedly connected in a seamless mode or are integrally formed, and the plastic mobile phone front cover (6) sequentially comprises a light shielding layer (5), a reflecting layer (4), an outer shell layer (1), a texture layer (2) and a functional coating layer (3). The plastic mobile phone front cover manufactured by the manufacturing process of the mobile phone shell front cover solves a series of problems.
Description
Technical Field
The invention relates to the field of plastic mobile phone front cover manufacturing, in particular to a preparation method of a plastic mobile phone front cover.
Background
At present, a plurality of problems exist in the process of manufacturing a plastic mobile phone front cover by adopting optical-grade transparent plastics, for example, in the conventional method, the optical-grade transparent plastics are subjected to injection molding and then hardened, and then the explosion-proof film subjected to texture transfer printing, film coating and silk printing is attached to obtain the plastic electronic product rear shell with the three-dimensional background pattern. Meanwhile, when the high-reflectivity coating penetrates through the adhesive layer, appearance defects are amplified. Furthermore, the separation performance is poor when a plastic mold is used for UV transfer printing, and a release layer, such as a fluorine coating layer or a metal layer that reduces surface tension, is generally plated, but as the number of uses increases, the coating layer or the metal layer is gradually damaged, resulting in failure of the mold. Moreover, the edge of the front cover of the plastic mobile phone and the camera are not protected, so that the camera and the front cover plate are easily damaged in the installation process.
Disclosure of Invention
The invention provides a preparation method of a plastic mobile phone front cover, which solves a series of problems in the manufacturing process of the plastic mobile phone front cover.
In order to solve the technical problems, the technical scheme of the invention is as follows: a plastic mobile phone front cover preparation method, the plastic mobile phone front cover after the preparation method of the plastic mobile phone front cover sequentially comprises a light shielding layer, a reflecting layer, a shell layer, a texture layer and a functional coating, the texture layer is arranged on one side surface or two side surfaces of the shell layer, the texture layer and the shell layer are integrally formed, the functional coating is a hardened coating, the plastic mobile phone front cover is an integrally formed plastic mobile phone front cover, a hole site for installing a camera is arranged on the plastic mobile phone front cover, reinforcing ribs which are fixedly connected are arranged at four corners and four sides of the plastic mobile phone front cover, the reinforcing ribs and the plastic mobile phone front cover are fixedly connected in a seamless mode or are integrally formed, a volume receiver hole site is arranged at the front end of the plastic mobile phone front cover, a display area site for installing a display screen is arranged in the middle of the plastic mobile phone front cover, the rear end of the plastic mobile phone front cover is provided with a mechanical or touch-sensitive key position, the plastic mobile phone front cover sequentially comprises a shading layer, a reflecting layer, an outer shell layer, a texture layer and a functional coating, and the preparation method of the plastic mobile phone front cover comprises the following steps:
the method comprises the following steps: injection molding, namely, according to different actual requirements, adopting optical transparent plastic, and simultaneously using a textured metal mold core to perform injection molding to form a plastic mobile phone front cover with a required shape;
step two: functionalization treatment, namely functionalizing the plastic mobile phone front cover subjected to injection molding in the step one;
step three: machining the numerical control machine tool, namely machining the appearance of the numerical control machine tool on the plastic mobile phone front cover subjected to the functionalized treatment in the step two according to different actual requirements;
step four: coating a film, preparing a reflecting layer, and coating a film on the inner surface of the plastic mobile phone front cover processed by the numerical control machine tool in a magnetron sputtering, PVD, CVD or evaporation mode to form the reflecting layer;
step five: preparing a shading layer, and completely covering the shading material on the inner surface of the front cover of the plastic mobile phone by using related processes according to different actual requirements on the basis of the fourth step to form the shading layer;
step six: and finally forming the required plastic mobile phone front cover through the steps from the first step to the fifth step.
Preferably, the optical grade transparent plastic in the first step is one or more of polymethyl methacrylate, propylene diglycol carbonate and polycarbonate.
Preferably, when the plastic mobile phone front cover with the required shape is injection molded through the mold core with the texture in the step one, the texture can be formed on the inner surface or the outer surface of the plastic mobile phone front cover or both the inner surface and the outer surface according to actual requirements.
Preferably, the injection molding in the first step is filled by injecting glue, and the injection molding conditions in the first step are as follows: the temperature is 100-350 ℃, the injection pressure is 10-190MPa, the pressure for pressure-maintaining molding is 10-98 MPa, and the time for pressure-maintaining molding is 5-180 s.
Preferably, in the second step, after the functionalization treatment is carried out through the liquid material, a functionalized coating of 2-40um is formed on the surface of the plastic mobile phone front cover.
Preferably, the liquid material comprises urethane acrylate, modified nanoparticles, high-tube-energy oligomer, a photoinitiator, a photocuring aid, a diluent and an aid, wherein the modified urethane acrylate comprises fluorine modified urethane acrylic resin; the conditions for forming the functional coating on the surface of the front cover of the plastic mobile phone are as follows: and (3) baking by adopting infrared rays at the temperature of 35-145 ℃ for 2-120 min, or curing by adopting ultraviolet rays at the energy of 100-1200 mJ for 5-180S.
Preferably, the rotating speed of a main shaft of the numerical control machine tool during the machining of the numerical control machine tool in the third step is 15000-90000 r/min, and the feeding speed is 100-3500 mm/min; when the reflecting layer is prepared in the fourth step, a mask for preventing the coating film from being overflowed to the outer surface of the front cover of the plastic mobile phone is arranged; and the process for preparing the light shielding layer in the fifth step is transfer printing, silk printing or spraying, the light shielding material for preparing the light shielding layer is colored ink, and the number of the prepared light shielding layer is 1-5.
Preferably, when 1-5 light shielding layers are prepared, surface drying is carried out at 40-180 ℃ for 1-30min every time 1 layer is finished, and after all the light shielding layers of 1-5 layers are finished, solid baking is carried out at 60-240 ℃ for 10-180 min.
Preferably, when the light shielding layer is prepared in the fifth step, the colored film with the light shielding effect is cut and then attached to the front cover of the plastic mobile phone, so that the light shielding layer is formed; the colored film is a sticky glue layer and a colored plastic film or an explosion-proof film with silk-screen colored ink, and is vacuum-bonded when being bonded with the front cover of the plastic mobile phone at the bonding temperature of 10-190 ℃.
Preferably, the thickness of the shell layer is 0.1-5.0mm, and the thickness of the functionalized coating is 2-40 um.
Preferably, a protective cover for protecting the camera is arranged on the camera front cover, the protective cover and the camera front cover are in seamless fixed connection or integrally formed, and the protective cover is provided with an upright edge or a slope edge which is vertically arranged with the plastic mobile phone front cover; the protective cover is made of transparent plastic or glass.
The invention has the following beneficial effects: (1) the invention directly splashes the coating on the inner surface of the front cover of the plastic mobile phone, thereby avoiding the risk of larger rupture of the coating on the explosion-proof membrane due to deformation when the coating is attached. Moreover, a proper mask can be used for shielding the plastic mobile phone front cover to prevent the coating film from overflowing to the outer surface of the plastic mobile phone front cover. (2) In order to reduce the thickness of the decorative film, the texture layer of the decorative film is directly cancelled, but when the plastic mobile phone front cover is subjected to injection molding, the mold core with the texture is used for replacing the mold core with the mirror surface, so that the plastic mobile phone front cover with the texture is obtained, then, a coating film is directly prepared on the texture layer through an evaporation coating or magnetron sputtering process, the phenomenon that the appearance defect is amplified when a high-reflectivity coating layer penetrates through a glue layer is avoided, and meanwhile, the yield of coating film breakage can be reduced to below 1% from 20%. (3) The invention can directly cancel the glue layer and directly use silk-screen printing, transfer printing or spraying a covering layer on the reflecting layer, thereby completing the product of the plastic mobile phone front cover and eliminating the bad appearance of orange peel lines on the glue layer. (4) The invention directly combines the texture and the injection molding process together, improves the efficiency and the first pass rate of the product, and can improve the first pass rate of the product from 70 percent to 85 percent. Meanwhile, the used mold core is made of metal and has the property of high hardness, so that the service life of the mold is greatly prolonged compared with that of a plastic mold, the service life of the mold is generally 5000 times compared with that of a conventional plastic mold, and the service life of the metal mold core is generally 500000 times. (5) The texture layer and the shell layer are directly and integrally formed, so that the process flow is saved, and the efficiency and the first pass yield of the product are improved. (6) The plastic mobile phone front cover is additionally provided with the reinforcing ribs, so that compared with the traditional mobile phone design, the plastic mobile phone front cover is not protected from being damaged in the installation process, and meanwhile, the reinforcing ribs can be integrally formed with the plastic mobile phone front cover, so that the flow is greatly saved in the manufacturing process. (7) The protective cover for protecting the camera is added on the plastic mobile phone front cover, compared with the traditional mobile phone design, only one hole site is designed, no protective measures are provided, the camera can be protected, meanwhile, the protective cover and the plastic mobile phone front cover can be integrally formed, and the flow is greatly saved in the manufacturing process. (8) The protective cover of the plastic mobile phone front cover is provided with the vertical edge or the slope edge, so that the camera can be well protected from being damaged, and the protective cover can be prevented from being damaged.
Drawings
Fig. 1 is a schematic perspective view of a plastic mobile phone front cover manufactured by the method for manufacturing a plastic mobile phone front cover according to the present invention, the plastic mobile phone front cover being used on a mobile phone.
Fig. 2 is a first cross-sectional view of a texture layer of the plastic mobile phone front cover on one side surface of an outer shell layer, which is manufactured by the method for manufacturing the plastic mobile phone front cover according to the present invention.
Fig. 3 is a second cross-sectional view of the texture layer of the plastic mobile phone front cover on one side surface of the outer shell layer, which is manufactured by the method for manufacturing the plastic mobile phone front cover of the present invention.
Fig. 4 is a cross-sectional view of the texture layer of the plastic mobile phone front cover manufactured by the method for manufacturing a plastic mobile phone front cover of the present invention on both side surfaces of the outer shell layer.
Fig. 5 is a perspective view of the protective cover of the plastic mobile phone front cover manufactured by the method for manufacturing the plastic mobile phone front cover of the present invention, which is provided with an upright edge.
Fig. 6 is a perspective view of the protective cover of the plastic mobile phone front cover with a slope edge, which is manufactured by the method for manufacturing the plastic mobile phone front cover.
Fig. 7 is a first flowchart of a method for manufacturing a front cover of a plastic mobile phone according to the present invention.
Fig. 8 is a second flowchart of the method for manufacturing the front cover of the plastic mobile phone according to the present invention.
Names of the corresponding components or flow names represented by numerals or letters in the drawings: 1. an outer shell layer; 2. a texture layer; 3. a functionalized coating; 4. a reflective layer; 5. a light-shielding layer; 6. a plastic mobile phone front cover; 7. hole site; 8. reinforcing ribs; 9. volume earphone hole position, 10, display area position; 11. pressing a key position; 12. a protective cover; 13. an upright edge; 14. and a slope surface edge.
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted; the same or similar reference numerals correspond to the same or similar parts; the terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be described in further detail with reference to examples. The method comprises the following specific steps:
detailed description of the invention
As shown in the figure, a hole 7 for mounting a camera is arranged on the plastic mobile phone front cover 6, a volume receiver hole 9 is arranged at the front end of the plastic mobile phone front cover 6, a display area 10 for mounting a display screen is arranged in the middle of the plastic mobile phone front cover 6, a mechanical or touch-sensitive key position 11 is arranged at the rear end of the plastic mobile phone front cover 6, reinforcing ribs 8 which are fixedly connected are arranged at four corners and four sides of the plastic mobile phone front cover 6, the reinforcing ribs 8 and the plastic mobile phone front cover 6 are in seamless fixed connection or integrated molding, the reinforcing ribs 8 arranged at the four corners of the plastic mobile phone front cover 6 are rectangular, and the reinforcing ribs 8 arranged at the four sides of the plastic mobile phone front cover 6 are integrally shaped like a Chinese character 'jing'. The material of the reinforcing rib 8 is transparent plastic or glass. In this embodiment, the reinforcing ribs 8 are fixedly connected to the plastic mobile phone front cover 6 in a seamless manner, the reinforcing ribs 8 at the four corners of the plastic mobile phone front cover 6 in this embodiment are rectangular, and the reinforcing ribs 8 at the four sides of the plastic mobile phone front cover 6 are integrally shaped like a Chinese character 'jing', as shown in fig. 1. Meanwhile, in this embodiment, the reinforcing rib 8 is made of transparent plastic.
Specifically, a protective cover 12 for protecting the camera is arranged on the camera front cover 7, the protective cover 12 and the camera front cover 7 are fixedly connected in a seamless mode or are integrally formed, and the protective cover 12 is provided with an upright edge 13 or a slope edge 14 which is perpendicular to the plastic mobile phone front cover 6. The protective cover 12 is made of transparent plastic or glass, and the protective cover 12 is provided with a slope edge 14 forming an included angle of 45 degrees with the front cover of the plastic mobile phone. In this embodiment, the protective cover is fixed to the hole site in a seamless manner, and the protective cover is provided with an upright edge perpendicular to the front cover of the plastic mobile phone, as shown in fig. 5, the protective cover is made of transparent plastic.
Specifically, the plastic mobile phone front cover 6 sequentially comprises a shading layer 5, a reflecting layer 4, an outer shell layer 1, a texture layer 2 and a functional coating 3, wherein the texture layer 2 is arranged on the surface of one side of the outer shell layer 1, the texture layer 2 and the outer shell layer 1 are integrally formed, the functional coating 3 is a hardened coating, the thickness of the outer shell layer 1 is 0.1-5.0mm, and the thickness of the functional coating 3 is 2-40 um. The texture layer 2 in this example is provided on the outer surface of the outer shell layer 1, i.e. in contact with the hardened coating 3; the thickness of the outer shell layer 1 is 0.1mm, and the thickness of the functionalized coating layer 3 is 2 um.
Detailed description of the invention
The main differences between the second embodiment and the first embodiment are as follows:
(1) in this embodiment, the reinforcing rib 8 and the plastic mobile phone front cover 6 are integrally formed.
(2) As shown in the drawing, the texture layer 2 in this example is provided on the inner surface of the outer shell layer 1, i.e., in contact with the reflective layer 4; the thickness of the outer shell layer 1 is 5mm, and the thickness of the functionalized coating 3 is 40 um.
(3) In this embodiment, the protective cover is fixedly connected to the hole site in a seamless manner, but the protective cover is provided with a slope edge forming an included angle of 45 degrees with the front cover 6 of the plastic mobile phone, as shown in the figure. Of course, the slope edge may have other curvature, and is not limited to 45 °.
Detailed description of the invention
The main differences between the third embodiment and the first embodiment are as follows:
(1) in this embodiment, the reinforcing rib 8 and the plastic mobile phone front cover 6 are integrally formed.
(2) As shown in fig. 4, the texture layer 2 in this example is provided on both side surfaces of the outer shell layer 1, i.e., the texture layer 2 is in contact with the reflective layer 4 and the hardened coating 3, respectively; the thickness of the outer shell layer 1 is 2.5mm, and the thickness of the functionalized coating layer 3 is 20 um.
(3) In this embodiment, the protective cover is fixedly connected to the hole site in a seamless manner, but the protective cover is provided with a slope edge forming an included angle of 45 degrees with the front cover 6 of the plastic mobile phone, as shown in the figure. Of course, the slope edge may have other curvature, and is not limited to 45 °.
Detailed description of the invention
In the first, second and third specific embodiments, the method for manufacturing the front cover of the plastic mobile phone comprises the following steps as shown in the flow chart:
the method comprises the following steps: injection moulding adopts optics level transparent plastic according to different actual demands, uses the metal mould benevolence that has the texture simultaneously to carry out injection moulding, and the injection moulding process adopts to penetrate to glue and fills, and the injection moulding condition is: the temperature is 100-350 ℃, the injection pressure is 10-190MPa, the pressure for pressure maintaining molding is 10-98 MPa, and the time for pressure maintaining molding is 5-180 s, so that the plastic mobile phone front cover with the required shape is finally formed. The optical grade transparent plastic is one or more combination of polymethyl methacrylate, propenyl diglycol carbonate and polycarbonate, and other optical grade transparent plastics can be adopted, and the optical grade transparent plastic is not limited to the three and the combination, and the combination of polymethyl methacrylate and polycarbonate is adopted in the example; when the plastic mobile phone front cover with the required shape is formed by injection molding through the textured mold core, the texture can be formed on the inner surface or the outer surface of the plastic mobile phone front cover or the inner surface and the outer surface exist at the same time according to the actual requirement, and the texture is formed on the inner surface of the plastic mobile phone front cover in the example. Meanwhile, the injection molding conditions in this example were: the temperature is 100 ℃, the injection pressure is 10MPa, the pressure for pressure maintaining molding is 10MPa, the time for pressure maintaining molding is 5s, and the thickness of the plastic mobile phone front cover after injection molding is 0.1 mm.
Step two: functional treatment, namely performing functional treatment on the plastic mobile phone front cover subjected to injection molding in the first step, wherein after the functional treatment is performed through a material, a functional coating of 2-40um is formed on the surface of the plastic mobile phone front cover, and the condition for forming the functional coating on the surface of the plastic mobile phone front cover is set as follows: and (3) baking by adopting infrared rays at the temperature of 35-145 ℃ for 2-120 min, or curing by adopting ultraviolet rays at the energy of 100-1200 mJ for 5-180S. The liquid material includes urethane acrylate, modified nanoparticles, high-energy oligomer, photoinitiator, photocuring aid, diluent, and aid, and the modified urethane acrylate includes fluorine-modified urethane acrylate resin. The condition for forming the functional coating on the surface of the front cover of the plastic mobile phone is as follows: and (3) baking by adopting infrared rays at the baking temperature of 35 ℃ for 2min to form a 2um functional coating on the surface of the front cover of the plastic mobile phone.
Step three: and (4) machining the numerical control machine tool, namely machining the appearance of the numerical control machine tool on the plastic mobile phone front cover hardened in the step two according to different actual requirements, wherein the rotating speed of a main shaft of the numerical control machine tool during machining of the numerical control machine tool is 15000-90000 rpm, and the feeding speed is 100-3500 mm/min. Of course, the spindle rotation speed and the feed speed may be adjusted as appropriate according to actual requirements. In this example, the rotational speed of the main shaft of the numerical control machine tool is 15000 rpm and the feed speed is 100 mm/min.
Step four: coating a film and preparing a reflecting layer, coating a film on the inner surface of the plastic mobile phone front cover after the plastic mobile phone front cover is processed by the numerical control machine tool in the third step in a magnetron sputtering, CVD or evaporation mode, namely forming the reflecting layer, and meanwhile, when the reflecting layer is prepared, arranging a mask for preventing the coating film from being coated on the outer surface of the plastic mobile phone front cover in an overflowing mode, certainly not arranging the mask, having no good effect, arranging the mask in the example, and adopting magnetron sputtering in the embodiment.
Step five: and C, preparing a shading layer, and completely covering the shading material on the inner surface of the front cover of the plastic mobile phone by using related processes according to different actual requirements on the basis of the step four, namely forming the shading layer. The process for preparing the light shielding layer comprises but is not limited to pad printing, silk printing or spraying, the light shielding material for preparing the light shielding layer is colored ink, but is not limited to black ink, the number of layers for preparing the light shielding layer is 1-5, and of course, the number of layers of the light shielding layer can also be set according to actual requirements. According to actual requirements, when 1-5 light shielding layers are prepared, surface drying is carried out at 40-180 ℃ for 1-30min every time 1 layer is finished, and after all the light shielding layers of 1-5 layers are finished, solid baking is carried out at 60-240 ℃ for 10-180 min. The shading material adopted in the embodiment is black ink, the number of the covering layers is 3, when 3 shading layers are prepared, surface drying is firstly carried out at the temperature of 110 ℃ for 15min after 1 shading layer is prepared, and after all the shading layers of 3 shading layers are finished, solid baking is carried out at the temperature of 150 ℃ for 95 min.
Step six: and finally forming the required plastic mobile phone front cover through the steps from the first step to the fifth step. As schematically shown.
Detailed description of the invention
The fifth embodiment is basically the same as the fourth embodiment in terms of setting conditions, and the main difference is that: as shown in the figure, when the light shielding layer is prepared in the fifth step, the colored film with the light shielding effect is cut and then attached to the front cover of the plastic mobile phone, so that the light shielding layer is formed. Wherein the colored film is a sticky glue layer and a colored plastic film or an explosion-proof film with silk-screen colored ink, and the colored film is vacuum-bonded with the front cover of the plastic mobile phone at a bonding temperature of 10-190 ℃. In this embodiment, the adhesive glue layer and the colored plastic film are made of high temperature resistant glue and black PET plastic film, and the bonding temperature is 100 ℃, but other materials with equivalent properties can be used as the colored film.
Detailed description of the invention
The setting conditions of the sixth embodiment are basically the same as those of the fourth embodiment, and the main difference is that: in step one, texture is formed on the outer surface of the front cover of the plastic mobile phone and the middle frame part. Meanwhile, the injection molding conditions in this example were: the temperature is 350 ℃, the injection pressure is 190MPa, the pressure for pressure maintaining molding is 98MPa, the time for pressure maintaining molding is 180s, and the thickness of the front cover of the plastic mobile phone after injection molding is 5.0 mm. The condition for forming the functional coating on the surface of the front cover of the plastic mobile phone in the second step is as follows: and (3) baking by adopting infrared rays at the baking temperature of 145 ℃ for 120min to form a 40um functional coating on the surface of the front cover of the plastic mobile phone. The main shaft rotating speed of the numerical control machine tool in the step three during the numerical control machine tool processing is 90000 r/min, and the feeding speed is 3500 mm/min. In the fourth step, a mask is arranged, and a reflecting layer is plated by adopting a CVD mode. And fifthly, the adopted shading material is black ink, the number of the shading layers is 1, when 1 shading layer is prepared, surface drying is carried out at the temperature of 40 ℃, infrared baking is carried out for 1min, after the shading layers of 1 layer are finished, solid baking is carried out, the temperature is 60 ℃, and the baking time is 10 min.
Detailed description of the invention
The seventh embodiment is basically the same as the fourth embodiment in terms of setting conditions, and the main difference is that: in step one, texture is formed on the outer surface of the front cover of the plastic mobile phone and the middle frame part. Meanwhile, the injection molding conditions in this example were: the temperature is 275 ℃, the injection pressure is 105MPa, the pressure for pressure maintaining molding is 55MPa, the time for pressure maintaining molding is 95s, and the thickness of the plastic mobile phone front cover after injection molding is 3.0 mm. The condition for forming the functional coating on the surface of the front cover of the plastic mobile phone in the second step is as follows: baking with infrared ray at 90 deg.C for 61 min. The main shaft rotating speed of the numerical control machine tool in the step three during the numerical control machine tool processing is 52500 rpm, and the feeding speed is 1750 mm/min. And step four, a mask is arranged, and the reflecting layer is plated in an evaporation mode. And fifthly, the black ink is used as the shading material, the number of the covering layers is 5, when the 5 shading layers are prepared, surface drying is firstly carried out at the temperature of 180 ℃ for 30min by using infrared baking every time 1 shading layer is prepared, and after the 5 shading layers are finished, solid baking is carried out at the temperature of 240 ℃ for 180 min.
Detailed description of the invention
The setting conditions of the eighth embodiment are basically the same as those of the fourth embodiment, and the main difference is that: the conditions for forming the functional coating on the surface of the front cover of the plastic mobile phone in the third step are as follows: ultraviolet curing is adopted, the curing energy is 100mJ, and the curing time is 180S.
Detailed description of the invention
The setting conditions of the ninth embodiment are basically the same as those of the fourth embodiment, and the main difference is that: the conditions for forming the functional coating on the surface of the front cover of the plastic mobile phone in the third step are as follows: ultraviolet curing is adopted, the curing energy is 1200mJ, and the curing time is 5S.
Detailed description of the preferred embodiment
The tenth embodiment is basically the same as the fourth embodiment in terms of setting conditions, and the main difference is that: the conditions for forming the functional coating on the surface of the front cover of the plastic mobile phone in the third step are as follows: ultraviolet curing is adopted, the curing energy is 600mJ, and the curing time is 90S.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A preparation method of a plastic mobile phone front cover is characterized by comprising the following steps: the plastic mobile phone front cover (6) manufactured by the preparation method of the plastic mobile phone front cover sequentially comprises a light shielding layer (5), a reflecting layer (4), a shell layer (1), a texture layer (2) and a functional coating (3), wherein the texture layer (2) is arranged on one side surface or two side surfaces of the shell layer (1), the texture layer (2) and the shell layer (1) are integrally formed, the functional coating (3) is a hardened coating, the plastic mobile phone front cover is an integrally formed plastic mobile phone front cover (6), hole sites (7) for mounting a camera are arranged on the plastic mobile phone front cover (6), reinforcing ribs (8) are fixedly connected at four corners and four sides of the plastic mobile phone front cover (6), the reinforcing ribs (8) and the plastic mobile phone front cover (6) are fixedly connected in a seamless mode or integrally formed, a volume receiver (9) is arranged at the front end of the plastic mobile phone front cover (6), the display area position (10) used for installing the display screen is arranged in the middle of the plastic mobile phone front cover (6), the mechanical or touch-sensitive key position (11) is arranged at the rear end of the plastic mobile phone front cover (6), the plastic mobile phone front cover (6) sequentially comprises a light shielding layer (5), a reflecting layer (4), an outer shell layer (1), a texture layer (2) and a functional coating (3), and the preparation method of the plastic mobile phone front cover comprises the following steps:
the method comprises the following steps: injection molding, namely, according to different actual requirements, adopting optical transparent plastic, and simultaneously using a textured metal mold core to perform injection molding to form a plastic mobile phone front cover with a required shape;
step two: functionalization treatment, namely functionalizing the plastic mobile phone front cover subjected to injection molding in the step one;
step three: machining the numerical control machine tool, namely machining the appearance of the numerical control machine tool on the plastic mobile phone front cover subjected to the functionalized treatment in the step two according to different actual requirements;
step four: coating a film, preparing a reflecting layer, and coating a film on the inner surface of the plastic mobile phone front cover processed by the numerical control machine tool in a magnetron sputtering, PVD, CVD or evaporation mode to form the reflecting layer;
step five: preparing a shading layer, and completely covering the shading material on the inner surface of the front cover of the plastic mobile phone by using related processes according to different actual requirements on the basis of the fourth step to form the shading layer;
step six: and finally forming the required plastic mobile phone front cover through the steps from the first step to the fifth step.
2. The method for preparing the front cover of the plastic mobile phone according to claim 1, wherein: the optical grade transparent plastic in the first step is one or more of polymethyl methacrylate, propenyl diglycol carbonate and polycarbonate.
3. The method for preparing the front cover of the plastic mobile phone according to claim 1, wherein: when the plastic mobile phone front cover with the required shape is formed by injection molding through the mold core with the texture in the step one, the texture can be formed on the inner surface or the outer surface of the plastic mobile phone front cover or the inner surface and the outer surface can exist simultaneously according to the actual requirement.
4. The method for preparing the front cover of the plastic mobile phone according to claim 1, wherein: the injection molding in the first step is filled by injecting glue, and the injection molding conditions in the first step are as follows: the temperature is 100-350 ℃, the injection pressure is 10-190MPa, the pressure for pressure-maintaining molding is 10-98 MPa, and the time for pressure-maintaining molding is 5-180 s.
5. The method for preparing the front cover of the plastic mobile phone according to claim 1, wherein: and in the second step, after the functionalization treatment is carried out through the liquid material, a 2-40um functionalization coating is formed on the surface of the plastic mobile phone front cover.
6. The method for preparing a plastic mobile phone front cover according to claim 5, wherein: the liquid material comprises urethane acrylate, modified nano particles, high-tube-energy oligomer, a photoinitiator, a photocuring auxiliary agent, a diluent and an auxiliary agent, wherein the modified urethane acrylate comprises fluorine modified urethane acrylic resin; the conditions for forming the functional coating on the surface of the front cover of the plastic mobile phone are as follows: and (3) baking by adopting infrared rays at the temperature of 35-145 ℃ for 2-120 min, or curing by adopting ultraviolet rays at the energy of 100-1200 mJ for 5-180S.
7. The method for preparing the front cover of the plastic mobile phone according to claim 1, wherein: the rotating speed of a main shaft of the numerical control machine tool in the step three during the machining process of the numerical control machine tool is 15000-90000 r/min, and the feeding speed is 100-3500 mm/min; when the reflecting layer is prepared in the fourth step, a mask for preventing the coating film from being overflowed to the outer surface of the front cover of the plastic mobile phone is arranged; and the process for preparing the light shielding layer in the fifth step is transfer printing, silk printing or spraying, the light shielding material for preparing the light shielding layer is colored ink, and the number of the prepared light shielding layer is 1-5.
8. The method for preparing the front cover of the plastic mobile phone according to claim 7, wherein: when the light shielding layers are 1-5 layers, surface drying is firstly carried out at 40-180 ℃ for each 1 layer, an infrared or hot air tunnel furnace is used for baking for 1-30min, after all the light shielding layers of 1-5 layers are finished, solid baking is carried out at 60-240 ℃ for 10-180 min.
9. The method for preparing a plastic mobile phone front cover according to claim 1, wherein: when the shading layer is prepared in the fifth step, the shading layer is formed by cutting the colored film with the shading effect and then attaching the cut colored film to the front cover of the plastic mobile phone; the colored film is a sticky glue layer and a colored plastic film or an explosion-proof film with silk-screen colored ink, and is vacuum-bonded when being bonded with the front cover of the plastic mobile phone at the bonding temperature of 10-190 ℃.
10. The method for preparing the front cover of the plastic mobile phone according to claim 1, wherein: the thickness of the outer shell layer (1) is 0.1-5.0mm, and the thickness of the functional coating (3) is 2-40 um; a protective cover (12) for protecting a camera is arranged on the camera front cover (7), the protective cover (12) and the camera front cover (7) are in seamless fixed connection or are integrally formed, and the protective cover (12) is provided with an upright edge (13) or a slope edge (14) which is vertically arranged with the plastic mobile phone front cover (6); the protective cover (12) is made of transparent plastic or glass.
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| CN202011624430.2A CN114683604A (en) | 2020-12-30 | 2020-12-30 | Preparation method of plastic mobile phone front cover |
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| CN207010756U (en) * | 2017-08-11 | 2018-02-13 | 东莞仁海科技股份有限公司 | It is a kind of to be easy to plate in the mobile phone of welding |
| CN207884682U (en) * | 2018-01-16 | 2018-09-18 | 东莞市艾利精密五金有限公司 | A kind of stainless steel mobile phone center |
| CN209562601U (en) * | 2019-04-25 | 2019-10-29 | 厦门祐尼三的新材料科技有限公司 | A kind of mobile phone camera protection cap assemblies |
| CN112109350A (en) * | 2020-07-02 | 2020-12-22 | 伯恩光学(惠州)有限公司 | Plastic shell and preparation method thereof |
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2020
- 2020-12-30 CN CN202011624430.2A patent/CN114683604A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207010756U (en) * | 2017-08-11 | 2018-02-13 | 东莞仁海科技股份有限公司 | It is a kind of to be easy to plate in the mobile phone of welding |
| CN207884682U (en) * | 2018-01-16 | 2018-09-18 | 东莞市艾利精密五金有限公司 | A kind of stainless steel mobile phone center |
| CN209562601U (en) * | 2019-04-25 | 2019-10-29 | 厦门祐尼三的新材料科技有限公司 | A kind of mobile phone camera protection cap assemblies |
| CN112109350A (en) * | 2020-07-02 | 2020-12-22 | 伯恩光学(惠州)有限公司 | Plastic shell and preparation method thereof |
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