Manufacturing method of leather mobile phone rear cover and mobile phone rear cover

Abstract

The embodiment of the invention relates to the technical field of leather and application thereof in a mobile phone rear cover, and provides a manufacturing method of a leather mobile phone rear cover and the mobile phone rear cover, and the method comprises the following steps: preparing a transparent release texture film; coating UV resin on the transparent release texture film to form a UV coating; coating a coating material on the UV coating to form a color middle layer; coating a UV adhesive on the color middle layer, laminating PC and PET, and curing to form a bonding middle layer; effect printing ink, cover bottom printing ink and release printing ink are sequentially silk-printed on the surface of the bonding middle layer to form an effect printing ink layer, a cover bottom printing ink layer and a release printing ink layer; releasing the transparent release texture film on the surface, carrying out excimer lamp curing and light curing treatment, and then carrying out hot pressing or high-pressure molding to obtain a semi-finished leather mobile phone rear cover; and after the semi-finished leather mobile phone rear cover is subjected to appearance processing, the finished mobile phone rear cover is obtained, so that the manufacturing efficiency of the leather mobile phone rear cover and the surface touch feeling of the leather mobile phone rear cover can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of leather and its application in mobile phone back covers, and in particular to a method for manufacturing a leather mobile phone back cover and a mobile phone back cover. Background Art

[0002] Leather, as a traditional material, is common in high-end mobile phone back covers because of its excellent touch, skin-friendliness and "luxury" consumption characteristics. Leather can be divided into genuine leather and artificial leather according to its material. Genuine leather refers to natural leather, which is processed from animal skin. Artificial leather refers to synthetic leather or other leather-like leather, which is actually a product artificially synthesized from basic chemical raw materials. Among them, artificial leather is commonly found in PVC, polyurethane PU leather, silicone leather, and high-tech leather made of microfiber materials according to its chemical composition. PVC (polyvinyl chloride) cannot be used in mobile phone back covers due to environmental issues. PU and silicone are commonly used leather materials in mobile phone back covers. The production process of PU or silicone leather is as follows:

[0003] Choose a release paper with good texture;

[0004] Apply PU topcoat on release paper, bake and cure, and provide surface properties such as surface touch and wear resistance;

[0005] Then apply the middle layer (color layer or base layer) on top, bake and cure to provide color and elasticity;

[0006] Applying an adhesive layer on the base layer for laminating with the fabric (cloth);

[0007] After release, the finished leather is formed;

[0008] After the leather is thermally bonded to the injection molded parts or plates in the back cover of the mobile phone, it is processed into the back cover of the mobile phone through hot pressing or high pressure molding, CNC and other processes. The traditional leather manufacturing process adopts thermal curing, which requires a long baking time of 1 to 2 hours, which is inefficient and energy-intensive. On the other hand, it is inefficient and costly. In addition, a large amount of volatile organic compounds (VOCs) are released during the leather production process, which is not friendly to the environment. Summary of the invention

[0009] The embodiments of the present application provide a method for manufacturing a leather mobile phone back cover and a mobile phone back cover, which can improve the efficiency of manufacturing the leather mobile phone back cover and the surface touch of the leather mobile phone back cover.

[0010] A first aspect of an embodiment of the present application provides a method for manufacturing a leather mobile phone back cover, the method comprising:

[0011] Step 1, preparing a transparent release texture film;

[0012] Step 2, coating the transparent release texture film with UV resin to form a UV coating;

[0013] Step 3, coating a coating material on the UV coating to form a color intermediate layer;

[0014] Step 4, coating the color middle layer with UV adhesive, laminating PC and PET and curing to form a bonding middle layer;

[0015] Step 5, screen printing effect ink, cover bottom ink and release ink in sequence on the surface of the bonding intermediate layer to form an effect ink layer, a cover bottom ink layer and a release ink layer;

[0016] Step 6, removing the transparent release texture film on the surface, and performing heat pressing or high pressure forming after excimer lamp curing and light curing treatment to obtain a semi-finished leather mobile phone back cover;

[0017] Step 7, processing the semi-finished leather mobile phone back cover to obtain a finished mobile phone back cover.

[0018] In a possible implementation, the step of preparing the transparent release texture film includes:

[0019] Select the leather grain texture stencil;

[0020] The transparent release texture film is prepared on the PET film by using UV release glue and a roll-to-roll transfer method.

[0021] In a possible implementation, the thickness of the UV coating is 30-50 microns, and the constituent materials of the UV coating include high-functionality polyurethane acrylate (functionality 3-6), monomers, photoinitiators, and additives.

[0022] In a possible implementation, the constituent materials of the color intermediate layer include bifunctional polyurethane acrylate, monomers, photoinitiators, and additives.

[0023] In a possible implementation, the bonding intermediate layer includes a bonding layer and a PC / PET film, the bonding layer has a thickness of 20-30 micrometers, and the PC / PET film has a thickness of 0.05-0.5 millimeters.

[0024] In a possible implementation, the transparent release texture film on the surface is released, and after the excimer lamp curing and light curing treatment, hot pressing or high pressure molding is performed to obtain a semi-finished leather mobile phone back cover, including:

[0025] The transparent release texture film on the surface is removed, and then cured by 172 / 254nm excimer lamp and then UV light curing. After curing, hot pressing or high pressure molding is performed to obtain a semi-finished leather mobile phone back cover.

[0026] In a possible implementation, the thickness of the effect ink layer is 6-8 micrometers, the thickness of the cover bottom ink layer is 18-24 micrometers, and the thickness of the release ink layer is 6-8 micrometers.

[0027] In a possible implementation, the total number of layers of the effect ink layer, the cover bottom ink layer and the release ink layer is 3-5 layers.

[0028] In a possible implementation, coating a coating material on the UV coating to form a color intermediate layer includes:

[0029] The UV coating is first cured by UVLED, and then a coating material is applied on the UV coating to form a color intermediate layer.

[0030] A second aspect of an embodiment of the present application provides a mobile phone back cover, comprising a finished mobile phone back cover manufactured by the method for manufacturing a leather mobile phone back cover as described in any one of the first aspects.

[0031] The manufacturing method of the leather mobile phone back cover proposed in this application has the following advantages:

[0032] 1. The surface feels excellent, with the surface layer combining leather texture and skin feel;

[0033] 2. The surface is UV coated, which has excellent wear resistance and anti-fouling properties;

[0034] 3. The entire leather manufacturing process is a full UV light curing process, which is highly efficient and low-pollution (can achieve "0" VOC release);

[0035] 4. The manufacturing process of the mobile phone back cover is simplified, no additional bonding process is required, and it is one-piece molded. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 A schematic process flow diagram of a method for manufacturing a leather mobile phone back cover is provided for an embodiment of the present application. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0040] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0041] In order to better understand the manufacturing method of a leather mobile phone back cover provided in the embodiment of the present application, the following first briefly introduces the existing manufacturing method of leather mobile phone back covers. In the existing scheme, polyurethane PU leather and silicone are commonly used leather materials in mobile phone back covers. The production process of polyurethane PU leather or silicone leather is as follows: select a release paper with a good texture; apply the PU topcoat on the release paper, bake and cure it, and provide surface properties such as surface touch and wear resistance; continue to apply the middle layer (color layer or base layer) on it, bake and cure it, and provide color and elasticity; apply an adhesive layer on the base layer for lamination with fabric (cloth); after release, the finished leather is formed;

[0042] After the leather is thermally bonded to the injection molded parts or plates in the back cover of the mobile phone, it is processed into the back cover of the mobile phone through hot pressing or high pressure molding, CNC and other processes. The traditional leather manufacturing process uses thermal curing, which requires a long baking time of 1 to 2 hours and high energy consumption. On the other hand, it is inefficient and costly. In addition, a large amount of volatile organic compounds (VOCs) are released during the leather production process, which is not friendly to the environment.

[0043] In order to solve the above-mentioned technical problems, the embodiments of the present application provide a method for manufacturing a leather mobile phone back cover, which simplifies the manufacturing of the leather mobile phone back cover, does not require an additional bonding process, and is one-piece formed.

[0044] Example 1

[0045] A method for manufacturing a leather mobile phone back cover is provided, comprising:

[0046] Step 1, preparing a transparent release texture film on a 0.188 mm PET substrate by a roll-to-roll transfer process;

[0047] Step 2, coating UV resin on the transparent release texture film to form a UV coating; the thickness of the UV coating is 30 to 50 microns, and the composition of the UV coating is as follows: GENOMER4690 resin (6 functionalities): 48 parts GENOMER4337 GENOMER7287 resin: 20 parts GENOMER4212, HDDA monomer: 20 parts GENOMER3135 monomer: 10 parts, photoinitiator: 184: 0.5 parts TPO-L: 0.5 parts, additive BYK333: 0.5 parts, BYK3505: 0.5 parts.

[0048] Step 3, coating the coating material on the UV coating to form an intermediate color layer; the composition of the color intermediate layer is GENOMER4212: 68 parts, HDDA monomer: 20 parts, THFA monomer: 10 parts, photoinitiator: 184: 1.0 parts, TPO-L: 0.5 parts, and auxiliary agent BYK333: 0.5 parts.

[0049] Step 4, coating the color middle layer with UV adhesive, laminating with 0.25 mm PET and curing to form a bonding middle layer;

[0050] Step 5, screen printing effect ink, cover bottom ink and release ink in sequence on the surface of the bonding intermediate layer to form an effect ink layer, a cover bottom ink layer and a release ink layer;

[0051] Step 6, remove the transparent release texture film on the surface, first use a 172nm excimer lamp, and then use a high-pressure mercury lamp for curing;

[0052] Step 7, the treated sheet is subjected to high pressure forming to obtain a semi-finished leather back cover;

[0053] Step 8, after the semi-finished product is processed in appearance, a finished mobile phone back cover with leather effect is obtained. The mobile phone back cover product is subjected to various tests such as adhesion, boiling adhesion, alcohol wiping, RCA paper tape wear resistance, vibration wear resistance, and hydrolysis test. The test structure is summarized in Table 1.

[0054] Example 2

[0055] Another method for manufacturing a leather mobile phone back cover is provided, comprising:

[0056] Step 1, preparing a transparent release texture film on a 0.125 mm PC substrate by a roll-to-roll transfer process;

[0057] Step 2, coating UV resin on the transparent release texture film to form a UV coating; the thickness of the UV coating is 30 to 50 microns, and the composition of the UV resin is as follows: GENOMER4691 resin (6 functionalities): 28 parts GENOMER4337 resin: 40 parts, HDDA monomer: 20 parts GENOMER3135 monomer: 10 parts, photoinitiator: 184: 0.5 parts TPO-L: 0.5 parts, additive BYK333: 0.5 parts, BYK3505: 0.5 parts.

[0058] Step 3, applying UV adhesive on the surface of the coating, laminating with 0.38 mm PC and curing to form a bonding middle layer;

[0059] Step 4, forming an optical texture layer on the surface of the bonding intermediate layer by UV transfer;

[0060] Step 5: Perform PVD (physical vapor deposition) vacuum coating on the optical texture layer to form a dielectric layer with a thickness of 30 to 300 nm and a composition of Si x O y and Nb x O y

[0061] Step 6, screen printing effect ink, cover bottom ink and release ink in sequence on the coating medium layer to form an effect ink layer, a cover bottom ink layer and a release ink layer;

[0062] Step 7, remove the transparent release texture film on the surface, first use a 254nm excimer lamp for curing, and finally use a high-pressure mercury lamp for curing;

[0063] Step 8, the processed sheet is subjected to high pressure forming to obtain a semi-finished leather back cover;

[0064] Step 9, after the semi-finished product is processed in appearance, a finished product of a mobile phone back cover with a leather effect is obtained.

[0065] The mobile phone back cover made in this way has the touch of leather material and the colorful effect of the plate back cover. The above mobile phone back cover products were subjected to various tests such as adhesion, boiling adhesion, alcohol wiping, RCA paper tape wear resistance, vibration wear resistance, and hydrolysis test. The test structure is summarized in Table 1.

[0066] Table 1. Test results of mobile phone back cover surface performance

[0067] Test items Example 1 Example 2 Adhesion (CT405AP-24 tape) 5B 5B Boiling adhesion (80℃60min) 5B 5B Alcohol test (500g force, 200 times) Pass Pass RCA tape wear resistance (175g force) 200 times 300 times Vibration wear test (frequency 50Hz, 2Hrs) Pass Pass Hydrolysis test (70°C, 10% sodium hydroxide solution) Pass Pass

[0068] Example 3

[0069] like Figure 1 As shown, another method for manufacturing a leather mobile phone back cover is provided, comprising:

[0070] Step 1, preparing a transparent release texture film;

[0071] Step 2, coating the transparent release texture film with UV resin to form a UV coating;

[0072] Step 3, coating a coating material on the UV coating to form a color intermediate layer;

[0073] Step 4, coating the color middle layer with UV adhesive, laminating PC and PET and curing to form a bonding middle layer;

[0074] Step 5, screen printing effect ink, cover bottom ink and release ink in sequence on the surface of the bonding intermediate layer to form an effect ink layer, a cover bottom ink layer and a release ink layer;

[0075] Step 6, removing the transparent release texture film on the surface, and performing heat pressing or high pressure forming after excimer lamp curing and light curing treatment to obtain a semi-finished leather mobile phone back cover;

[0076] Step 7, after the semi-finished leather is processed in appearance, a finished leather for mobile phone back cover is obtained.

[0077] Among them, in step 1, the preparation of the transparent release texture film includes: selecting a leather texture mold; using UV release glue and adopting a roll-to-roll transfer method to prepare the transparent release texture film on a PET film.

[0078] The thickness of the UV coating is 30-50 microns, and the constituent materials of the UV coating include high-functionality polyurethane acrylate (functionality 3-6), monomers, photoinitiators, and auxiliary agents.

[0079] The constituent materials of the color intermediate layer include bifunctional polyurethane acrylate, monomer, photoinitiator and auxiliary agent.

[0080] The bonding intermediate layer comprises a bonding layer and a PC / PET film, the bonding layer has a thickness of 20-30 microns, and the PC / PET film has a thickness of 0.05-0.5 millimeters.

[0081] Specifically, the transparent release texture film on the surface can be removed, and then cured by a 172 / 254 nm excimer lamp, and then UV light cured. After curing, hot pressing or high pressure molding is performed to obtain a semi-finished leather.

[0082] The thickness of the effect ink layer is 6-8 microns, the thickness of the cover bottom ink layer is 18-24 microns, and the thickness of the release ink layer is 6-8 microns.

[0083] The total number of layers of the effect ink layer, the cover bottom ink layer and the release ink layer is 3-5 layers.

[0084] Specifically, the UV coating is first cured by UVLED, and then a coating material is coated on the UV coating to form a color intermediate layer.

[0085] The glass fiber back cover manufacturing process proposed in this application has the following advantages:

[0086] 1. The surface feels excellent, with the surface layer combining leather texture and skin feel;

[0087] 2. The surface is UV coated, which has excellent wear resistance and anti-fouling properties;

[0088] 3. The entire leather manufacturing process is a full UV light curing process, which is highly efficient and low-pollution (can achieve "0" VOC release);

[0089] 4. The manufacturing process of the mobile phone back cover is simplified, no additional bonding process is required, and it is one-piece molded.

[0090] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0091] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0092] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A method for manufacturing a leather mobile phone back cover, characterized in that: The method comprises: Step 1, preparing a transparent release texture film; Step 2, coating the transparent release texture film with UV resin to form a UV coating; Step 3, coating a coating material on the UV coating to form a color intermediate layer; Step 4, coating the color middle layer with UV adhesive, laminating PC and PET and curing to form a bonding middle layer; Step 5, screen printing effect ink, cover bottom ink and release ink in sequence on the surface of the bonding intermediate layer to form an effect ink layer, a cover bottom ink layer and a release ink layer; Step 6, removing the transparent release texture film on the surface, and performing heat pressing or high pressure forming after excimer lamp curing and light curing treatment to obtain a semi-finished leather mobile phone back cover; Step 7, processing the semi-finished leather mobile phone back cover to obtain a finished mobile phone back cover.

2. The method for manufacturing a leather mobile phone back cover according to claim 1, characterized in that: The method for preparing the transparent release texture film comprises: Select the leather grain texture stencil; The transparent release texture film is prepared on the PET film by using UV release glue and a roll-to-roll transfer method.

3. The method for manufacturing a leather mobile phone back cover according to claim 2, characterized in that: The thickness of the UV coating is 30-50 microns, and the constituent materials of the UV coating include high-functionality polyurethane acrylate (functionality 3-6), monomers, photoinitiators, and auxiliary agents.

4. The method for manufacturing a leather mobile phone back cover according to claim 3, characterized in that: The constituent materials of the color intermediate layer include bifunctional polyurethane acrylate, monomer, photoinitiator and auxiliary agent.

5. The method for manufacturing a leather mobile phone back cover according to claim 4, characterized in that: The bonding intermediate layer comprises a bonding layer and a PC / PET film, the bonding layer has a thickness of 20-30 microns, and the PC / PET film has a thickness of 0.05-0.5 millimeters.

6. The method for manufacturing a leather mobile phone back cover according to any one of claims 1 to 5, characterized in that: The transparent release texture film on the surface is removed, and after the excimer lamp curing and light curing treatment, hot pressing or high pressure molding is performed to obtain a semi-finished leather mobile phone back cover, including: The transparent release texture film on the surface is removed, and then cured by a 172 / 254nm excimer lamp and then UV light curing. After curing, hot pressing or high pressure molding is performed to obtain a semi-finished leather mobile phone back cover.

7. The method for manufacturing a leather mobile phone back cover according to claim 6, characterized in that: The thickness of the effect ink layer is 6-8 microns, the thickness of the cover bottom ink layer is 18-24 microns, and the thickness of the release ink layer is 6-8 microns.

8. The method for manufacturing a leather mobile phone back cover according to claim 7, characterized in that: The total number of layers of the effect ink layer, the cover bottom ink layer and the release ink layer is 3-5 layers.

9. The method for manufacturing a leather mobile phone back cover according to claim 7 or 8, characterized in that: The step of coating the coating material on the UV coating to form a color intermediate layer comprises: The UV coating is first cured by UVLED, and then a coating material is applied on the UV coating to form a color intermediate layer.

10. A mobile phone back cover, characterized in that: The mobile phone back cover comprises a finished mobile phone back cover manufactured by the method for manufacturing a leather mobile phone back cover as described in any one of claims 1-9.

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