Multicolor gradient glass fiber mobile phone rear cover and manufacturing method thereof

Abstract

The invention discloses a multicolor gradient glass fiber mobile phone rear cover and a manufacturing method thereof. The manufacturing method comprises the following steps: (1) forming a release layer with a texture structure on a base film; (2) forming a pre-curing layer on the release layer, wherein the pre-curing layer is provided with a first texture layer; (3) screen-printing gloss oil on the pre-cured layer to form a bridging layer; (4) performing offset printing on the bridging layer to form an offset printing color pattern layer with the color transmittance of 60-90%; (5) performing UV transfer printing on the offset printing color pattern layer to form a second texture layer; (6) electroplating the second texture layer to form an electroplated layer; (7) screen-printing bottom covering ink on the electroplated layer to form an ink layer; (8) the curved glass fiber plate and the ink layer are bonded through an adhesive under the vacuum condition, and then UV curing is conducted to form a curing layer; and (9) stripping the base film and the release layer. The offset printing color pattern layer and the electroplated layer are applied to the curved glass fiber plate, so that the multicolor gradient effect of complex colors can be realized.

Description

Technical Field

[0001] The invention belongs to the technical field of electronic equipment back covers, and in particular relates to a multi-color gradient glass fiber mobile phone back cover and a manufacturing method thereof. Background Art

[0002] The innovative design of product appearance provides a distinctive appearance and brings a strong visual impact to consumers. Take smartphones as an example. In the past, they only focused on improving functions and performance, and the appearance design was relatively traditional. However, as major brands continue to innovate, consumers are beginning to seek a mobile phone with a different appearance from others to show their personality and uniqueness. When consumers see a mobile phone with a unique and fashionable appearance, they will be attracted and want to buy it. The innovative design of product appearance has become a major driving force for the purchase boom.

[0003] As a material with light weight, high strength, high toughness, good insulation, corrosion resistance, fatigue resistance, and designable structural functions, glass fiber board is made into electronic product back covers through punching / CNC (plane) or hot pressing (3D), and the decorative effect is added. It has the characteristics of lightness, thinness, and high strength, making it an ideal material for thin and light back covers of electronic products such as mobile phones and tablets. There are various surface decoration processes for glass fiber board back covers. In addition to simple spraying, there are also screen printing, texture transfer, rubbing, etc. Different surface treatment processes can give products different visual and tactile effects. However, these traditional surface treatment processes also have their own limitations: for example, spraying is mainly used to provide a uniform color coating, and it is difficult to achieve complex color changes in the same spraying process; screen printing is more difficult to achieve a smooth color gradient effect, and it is more suitable for printing clear boundaries and patterns; texture transfer and rubbing use UV glue or paint to copy the texture (micro-nano structure) on the mold, which can only show changes in light and shadow, but cannot achieve color gradients. Therefore, most glass fiber board back covers on the market currently have limitations in achieving gradient and multi-color gamut effects.

[0004] Therefore, there is an urgent need for a multi-color gradient glass fiber mobile phone back cover and a manufacturing method thereof to solve the deficiencies of the prior art problems. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide a multi-color gradient glass fiber mobile phone back cover and a manufacturing method thereof, which applies an offset color pattern layer and an electroplating layer to a curved glass fiber board to achieve a multi-color gradient effect with complex colors.

[0006] To achieve the above objectives, the first aspect of the present invention provides a method for manufacturing a multi-color gradient glass fiber mobile phone back cover, the steps comprising:

[0007] (1) forming a release layer on the base film, wherein the release layer has a texture structure;

[0008] (2) coating a dual-cured polyurethane acrylate on the release layer, and subjecting the dual-cured polyurethane acrylate to thermal curing to form a pre-cured layer, wherein the pre-cured layer has a first texture layer matching the texture structure;

[0009] (3) Screen printing varnish on the pre-cured layer to form a bridging layer;

[0010] (4) offset printing on the bridging layer to form an offset color pattern layer having a color transmittance of 60 to 90%;

[0011] (5) performing UV transfer printing on the offset color pattern layer to form a second texture layer;

[0012] (6) performing electroplating on the second texture layer to form an electroplated layer;

[0013] (7) screen printing a bottom cover ink on the electroplating layer to form an ink layer;

[0014] (8) bonding the curved glass fiber board and the ink layer under vacuum conditions with an adhesive, and then UV curing the pre-cured layer to form a cured layer;

[0015] (9) Peeling off the base film and the release layer to obtain a multi-color gradient glass fiber mobile phone back cover.

[0016] Compared with the prior art, the present invention forms an offset color pattern layer with a color transmittance of 60 to 90% by offset printing on the bridging layer. Part of the light will be absorbed or reflected, while the rest will pass through the layer, thereby achieving different degrees of color depth changes in different areas. Electroplating is performed on the second texture layer to form an electroplating layer, which can not only give the back cover of the mobile phone a metallic texture, but also affect the final observed color effect through the reflection and refraction of light. Therefore, the present invention applies the offset color pattern layer and the electroplating layer to the curved fiberglass board, so that when the light passes through the offset color pattern layer with different color transmittances and interacts with the electroplating layer, the colors of different areas will be visually mixed, producing an effect of gradually transitioning from one color to another, thereby achieving a complex color multi-color gradient effect, making the appearance more beautiful, improving the consumer experience, and meeting more consumer needs.

[0017] Furthermore, the base film of the present invention is at least one of a PO film and a PET film.

[0018] Furthermore, the thermal curing in step (2) of the present invention comprises: baking at 60-70° C. for 60-90 minutes.

[0019] Furthermore, the light transmittance of the solidified layer of the present invention is greater than 90%; the light transmittance of the bridging layer is greater than 90%.

[0020] Furthermore, the color transmittance of the offset color pattern layer of the present invention is 70-80%.

[0021] Furthermore, the thickness of the release layer of the present invention is 10 to 40 μm; the thickness of the cured layer is 10 to 40 μm.

[0022] Furthermore, the thickness of the bridging layer of the present invention is 3-8 μm; the thickness of the second texture layer is 8-15 μm.

[0023] Furthermore, the thickness of the electroplating layer of the present invention is 30 to 300 nm, and the electroplating layer includes at least one of ZrO / SiO / NbO / SiO / NbO, ZrO / SiO / NbO / SiO / NbO / SiO / NbO, and ZrO / SiO / NbO / In / SiO / NbO.

[0024] Furthermore, the thickness of the ink layer of the present invention is 30 to 50 μm; the thickness of the adhesive is 15 to 30 μm.

[0025] Furthermore, in step (8) of the present invention, UV curing includes: using a UV mercury lamp or an electrodeless lamp device with an energy of 600 to 1000 mJ / cm 2 .

[0026] Correspondingly, the second aspect of the present invention provides a multi-color gradient glass fiber mobile phone back cover, which is manufactured by the above-mentioned manufacturing method of the multi-color gradient glass fiber mobile phone back cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The present invention is a process flow chart of the method for manufacturing the multi-color gradient glass fiber mobile phone back cover.

[0028] Figure 2 This is a diagram showing the state of peeling off the base film and release layer.

[0029] Figure 3 It is a schematic structural diagram of the multi-color gradient glass fiber mobile phone back cover of the present invention.

[0030] Figure 4 The present invention is a physical picture of a multi-color gradient glass fiber mobile phone back cover manufactured by the manufacturing method of the multi-color gradient glass fiber mobile phone back cover of the present invention. DETAILED DESCRIPTION

[0031] In order to better illustrate the purpose, technical solution and beneficial effects of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the following implementation method is a further explanation of the present invention and should not be used as a limitation of the present invention.

[0032] Please refer to Figure 1 The present invention provides a method for manufacturing a multi-color gradient glass fiber mobile phone back cover, and its process flow chart is as follows Figure 1 As shown, Figure 1 The process flow chart is: providing a base film → forming a release layer → forming a pre-curing layer → forming a bridging layer → forming an offset color pattern layer → forming a second texture layer → forming an electroplating layer → forming an ink layer → bonding with a curved fiberglass board → forming a curing layer → peeling off the base film and the release layer. Specifically, providing a base film provides a carrier that supports the formation of each subsequent step. The release layer is formed to facilitate the removal of the unnecessary base film in the final process, and to transfer its own texture structure to the curing layer in the subsequent steps. The curing layer is formed so that the back cover of the mobile phone can still maintain a stable structure after the base film and the release layer are peeled off. A bridging layer is formed to enhance the bonding force between the layers. Forming an offset color pattern layer by offset printing is a key process for achieving multi-color color gradients. By controlling the color transmittance between 60% and 90%, different degrees of color depth changes can be achieved in different areas. The formation of a second texture layer with a specific texture provides additional visual and tactile effects for the product, enhancing the aesthetics and texture of the product. Forming an electroplating layer on the second texture layer is another key process to achieve multi-color color gradient. The metal texture of the electroplating layer can change the direction and intensity of the incident light, thereby affecting the final observed color. Forming an ink layer not only provides additional color and pattern effects for the product, but also protects the electroplating layer from wear and tear. Bonding with the curved fiberglass board to form a complete mobile phone back cover ensures a strong bond between the curved fiberglass board and the ink layer. After peeling off the base film and release layer, a multi-color gradient fiberglass mobile phone back cover can be obtained.

[0033] Please refer to Figures 2-3 After peeling off the base film 11 and the release layer 12, a multi-color gradient glass fiber mobile phone back cover 100 is obtained. The multi-color gradient glass fiber mobile phone back cover 100 includes a solidified layer 111, a bridge layer 112, an offset color pattern layer 113, a second texture layer 114, an electroplating layer 115, an ink layer 116, an adhesive 117, and a curved glass fiber board 118 from top to bottom. The steps of the manufacturing method of the multi-color gradient glass fiber mobile phone back cover of the present invention include:

[0034] (1) forming a release layer 12 on the base film 11, wherein the release layer 12 has a texture structure;

[0035] (2) coating dual-cured polyurethane acrylate on the release layer 12, and thermally curing the dual-cured polyurethane acrylate to form a pre-cured layer, wherein the pre-cured layer has a first texture layer matching the texture structure;

[0036] (3) Screen printing varnish on the pre-cured layer to form a bridging layer 112;

[0037] (4) offset printing is performed on the bridge layer 112 to form an offset printing color pattern layer 113 having a color transmittance of 60 to 90%;

[0038] (5) UV transfer is performed on the offset color pattern layer 113 to form a second texture layer 114;

[0039] (6) performing electroplating on the second texture layer 114 to form an electroplated layer 115;

[0040] (7) Screen printing a base ink on the electroplating layer 115 to form an ink layer 116;

[0041] (8) Adhesive 117 is used to bond the curved glass fiber board 118 and the ink layer 116 under vacuum conditions, and then UV curing is performed to form a cured layer 111 from the pre-cured layer;

[0042] (9) Peeling off the base film 11 and the release layer 12, and obtaining a multi-color gradient glass fiber mobile phone back cover 100.

[0043] Correspondingly, a physical picture of a multi-color gradient glass fiber mobile phone back cover made by the above manufacturing method is as follows: Figure 4 As shown by Figure 4 It can be seen that the back cover of the mobile phone presents an effect of gradual transition of multiple colors, that is, the back cover of the mobile phone can achieve a complex color multi-color gradient effect, and the appearance is more beautiful.

[0044] More specifically, in a preferred technical solution, a release agent is coated on the base film 11, and then cured to form a release layer 12, and a texture manufacturing technology is used to form a desired texture structure on the release layer 12 during the curing process. Preferably, a UV transfer texture method is used to form a texture structure on the release layer 12, and the release agent can be selected from a silicon-containing polyurethane acrylate resin or a fluorine-containing polyurethane acrylate resin.

[0045] More specifically, in a preferred technical solution, the base film 11 is at least one of a PO film and a PET film. Both the PO film and the PET film have good tensile properties, which allows them to maintain good deformation ability when they are laminated with the curved fiberglass board 118 in the subsequent step (8). When the base film 11 is laminated with the curved fiberglass board 118, the tensile properties of the base film 11 allow it to deform along with the shape of the curved surface without generating wrinkles, and further drive the layers thereon (such as the first texture layer, the offset color pattern layer 113, the second texture layer 114, etc.) to be stretched synchronously, thereby ensuring the integrity of the color pattern and texture regularity.

[0046] More specifically, in a preferred technical solution, the thermal curing in step (2) includes: baking at 60-70°C for 60-90 minutes. Specifically, the thermal curing temperature may be, but not limited to, 60°C, 63°C, 65°C, 68°C, 70°C; the baking time may be, but not limited to, 60min, 66min, 70min, 74min, 78min, 83min, 86min, 90min.

[0047] More specifically, in a preferred technical solution, the thickness of the release layer 12 is 10 to 40 μm, such as the thickness of the release layer 12 may be but is not limited to 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 28 μm, or 40 μm.

[0048] More specifically, in a preferred technical solution, dual-cured polyurethane acrylate is coated on the release layer 12, and the dual-cured polyurethane acrylate is thermally cured to form a pre-cured layer, and a first texture layer ( Figure 2-3 not shown).

[0049] More specifically, in a preferred technical solution, the light transmittance of the solidified layer 111 is greater than 90%; the high light transmittance of the solidified layer 111 ensures the vividness and authenticity of the color of the offset color pattern layer 113. For example, a high light transmittance double-cured polyurethane acrylate can be selected to obtain a high light transmittance solidified layer 111.

[0050] More specifically, in a preferred technical solution, the thickness of the solidified layer 111 is 10 to 40 μm, such as the thickness of the solidified layer 111 may be but is not limited to 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 28 μm, and 40 μm.

[0051] More specifically, in a preferred technical solution, a varnish with high light transmittance is screen-printed on the pre-cured layer to form a bridge layer 112 with a light transmittance greater than 90%. The high light transmittance of the bridge layer 112 ensures the vividness and authenticity of the color of the offset color pattern layer 113.

[0052] More specifically, in a preferred technical solution, the thickness of the bridging layer 112 is 3 to 8 μm; for example, the thickness of the bridging layer 112 may be, but is not limited to, 3 μm, 5 μm, 6 μm, 7 μm, or 8 μm.

[0053] More specifically, in a preferred technical solution, CMYK (cyan, magenta, yellow, black) four-color ink and / or spot color ink are mixed in a specific ratio to form offset printing ink for offset printing. During the offset printing process, the offset printing ink is first applied to a printing plate with graphic information, the graphic part on the printing plate absorbs the offset printing ink, the rubber blanket cylinder contacts the printing plate, and the offset printing ink of the graphic part is transferred to the rubber blanket, and then the offset printing ink on the rubber blanket is transferred to the bridge layer 112 to form an offset printing color pattern layer 113. More specifically, the color transmittance of the offset printing color pattern layer 113 is controlled to be 60-90% by controlling the light transmittance of the offset printing ink.

[0054] More specifically, in a preferred technical solution, the color transmittance of the offset color pattern layer 113 is 70-80%. The inventor of the present invention found during the invention process that within this transmittance range, the offset color pattern layer 113 is neither completely transparent nor completely opaque, which can provide a good visual balance point and thus have a soft multi-color gradient effect.

[0055] More specifically, in a preferred technical solution, UV transfer is performed on the offset color pattern layer 113 to form a second texture layer 114 with a thickness of 8-15 μm. The thickness of the second texture layer 114 can be, but is not limited to, 8 μm, 10 μm, 12 μm, or 15 μm.

[0056] More specifically, in a preferred technical solution, a magnetron sputtering machine is used to perform electroplating on the second texture layer 114 to form an electroplating layer 115; the electroplating layer 115 includes at least one of ZrO / SiO / NbO / SiO / NbO, ZrO / SiO / NbO / SiO / NbO / SiO / NbO, and ZrO / SiO / NbO / In / SiO / NbO. For example, the electroplating layer 115 with a ZrO / SiO / NbO / SiO / NbO structure can achieve a transparent brightening effect; for example, the electroplating layer 115 with a ZrO / SiO / NbO / SiO / NbO / SiO / NbO structure can achieve a color film effect; for example, the electroplating layer 115 with a ZrO / SiO / NbO / SiO / NbO structure can achieve a bright silver effect.

[0057] More specifically, in a preferred technical solution, the thickness of the electroplating layer 115 is 30-300 nm, such as the thickness of the electroplating layer 115 may be but is not limited to 30 nm, 80 nm, 160 nm, 210 nm, 260 nm, and 300 nm.

[0058] More specifically, in a preferred technical solution, a bottom cover ink is screen-printed on the electroplating layer 115 to form an ink layer 116 with a thickness of 30-50 μm. For example, the thickness of the ink layer 116 may be, but is not limited to, 30 μm, 40 μm, or 50 μm.

[0059] More specifically, step (5) includes: screen printing a varnish with a light transmittance greater than 92% on the offset color pattern layer 113 to form a protective layer, and then UV transfer printing is performed on the protective layer to form the second texture layer 114. The UV glue used in UV transfer is in liquid form before curing, and it may flow into the gaps or uneven places in the offset color pattern layer 113, thereby affecting the regularity of the texture of the second texture layer 114. Based on this, the present invention screen prints a high-transmittance varnish on the offset color pattern layer 113 to form a protective layer. The existence of the protective layer can solve the problem of irregular texture caused by the flow of UV glue; in addition, the high light transmittance of the varnish does not affect the clarity of the offset color pattern layer 113.

[0060] More specifically, in a preferred technical solution, the adhesive 117 is coated or screen-printed on the ink layer 116, and then the curved fiberglass board 118 is vacuum-bonded on the adhesive 117. The curved fiberglass board 118 has a three-dimensional shape or a four-dimensional shape.

[0061] More specifically, in a preferred technical solution, the UV curing in step (8) of the present invention includes: using a UV mercury lamp or an electrodeless lamp device with an energy of 600 to 1000 mJ / cm 2 . For example, the energy may be, but is not limited to, 600 mJ / cm 2 、700mJ / cm 2 、800mJ / cm 2 、900mJ / cm 2 、1000mJ / cm 2 .

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A method for manufacturing a multi-color gradient glass fiber mobile phone back cover, characterized in that the steps include: (1) forming a release layer on the base film, wherein the release layer has a texture structure; (2) coating dual-cured polyurethane acrylate on the release layer, and thermally curing the dual-cured polyurethane acrylate to form a pre-cured layer, wherein the pre-cured layer has a first texture layer matching the texture structure; (3) screen printing varnish on the pre-cured layer to form a bridging layer; (4) offset printing on the bridging layer to form an offset printing color pattern layer having a color transmittance of 60 to 90%; (5) performing UV transfer printing on the offset color pattern layer to form a second texture layer; (6) performing electroplating on the second texture layer to form an electroplated layer; (7) screen printing a bottom cover ink on the electroplating layer to form an ink layer; (8) using an adhesive to bond the curved fiberglass board and the ink layer under vacuum conditions, and then UV curing the pre-cured layer to form a cured layer; (9) Peeling off the base film and the release layer to obtain a multi-color gradient glass fiber mobile phone back cover.

2. The method for manufacturing a multi-color gradient glass fiber mobile phone back cover according to claim 1, characterized in that: The base film is at least one of a PO film and a PET film.

3. The method for manufacturing a multi-color gradient glass fiber mobile phone back cover according to claim 1, characterized in that: The light transmittance of the solidified layer is greater than 90%; the light transmittance of the bridging layer is greater than 90%.

4. The method for manufacturing a multi-color gradient glass fiber mobile phone back cover according to claim 1, characterized in that: The color transmittance of the offset color pattern layer is 70-80%.

5. The method for manufacturing a multi-color gradient glass fiber mobile phone back cover according to claim 1, characterized in that: The thickness of the release layer is 10 to 40 μm; the thickness of the solidified layer is 10 to 40 μm.

6. The method for manufacturing a multi-color gradient glass fiber mobile phone back cover according to claim 1, characterized in that: The thickness of the bridge layer is 3-8 μm; the thickness of the second texture layer is 8-15 μm.

7. The method for manufacturing a multi-color gradient glass fiber mobile phone back cover according to claim 1, characterized in that: The thickness of the electroplating layer is 30 to 300 nm, and the electroplating layer includes at least one of ZrO / SiO / NbO / SiO / NbO, ZrO / SiO / NbO / SiO / NbO / SiO / NbO, and ZrO / SiO / NbO / In / SiO / NbO.

8. The method for manufacturing a multi-color gradient glass fiber mobile phone back cover according to claim 1, characterized in that: The thickness of the ink layer is 30-50 μm; the thickness of the adhesive is 15-30 μm.

9. A multi-color gradient fiberglass mobile phone back cover, characterized in that: The multi-color gradient glass fiber mobile phone back cover is manufactured by the manufacturing method of any one of claims 1 to 8.

Images