Production process of leather-texture rear cover of mobile phone

Abstract

The invention discloses a dermatoglyph mobile phone rear cover production process which comprises the following steps: step 1, preparing glue, namely preparing used glue, step 2, dispensing glue, namely dispensing the used glue in the step 1 on a forming surface of a PC (Poly Carbonate) sub-diaphragm within 3.5-4.5 hours in a dispensing manner; thirdly, rolling is conducted, specifically, hot rolling is conducted on the composite board obtained in the second step through a roller, and a to-be-cured finished product is obtained; fourthly, UV curing is conducted, and a UV cured part is obtained; and step 5, baking to obtain the mobile phone rear cover with leather texture and hand feeling on the surface. Compared with the prior art, the surface of the rear cover of the mobile phone can be subjected to thick coating treatment by using specific glue, a baking mode and transfer printing operation, so that the surface texture of the rear cover of the mobile phone can achieve the leather texture effect of relatively deep texture and thick hand feeling.

Description

Technical Field

[0001] The invention relates to the field of mobile phone accessories manufacturing, and in particular to a production process for a leather-grained mobile phone back cover. Background Art

[0002] The back covers that are traditionally sold are generally made of plastic, glass, metal (mainly aluminum) and ceramics, and they have different types of defects. For example: 1) The plastic back cover has low cost, is easy to process, and has no electromagnetic signal interference problems, but the surface is not scratch-resistant, the texture is poor, the structural strength is poor, and the thermal insulation is poor; 2) Although the glass back cover has a scratch-resistant surface, good texture, and no electromagnetic signal interference problem, the glass is easy to break when it falls, and it cannot provide structural support by itself, so a metal middle frame must be designed to match the glass as a structural support for the entire machine, which is costly and complex in structure; 3) Although the metal aluminum back cover has the advantages of good structure, good heat dissipation, and good scratch resistance, because metal has electromagnetic signal interference problems, all metal back covers need to be inlaid with a plastic antenna strip at both ends so that the electromagnetic signal can be transmitted normally, so the appearance cannot be kept consistent. For this reason, a composite board with a PMMA layer and a PC layer is used as the raw material of the mobile phone back cover on the market. During processing, this composite board is sprayed or transferred on the back of the mobile phone back cover to achieve the appearance decoration effect, so that the front of the mobile phone back cover is smooth and the front touch is hard. For this reason, the surface embossing treatment on the market makes the surface of the mobile phone back cover rough. The specific operation is: first, apply a common UV glue on the cavity surface of the mold, then press it on the material, roll the mold, and use LED UV to cure it after rolling. After curing, use a secondary mercury lamp UV to cure it. Although this surface embossing treatment method can make the surface rough, this UV glue has better fluidity and cannot be thickly applied, so it is impossible to achieve leather grain texture processing and leather grain feel.

[0003] In view of this, the inventor conducted in-depth research on the above-mentioned issues, which resulted in the present case. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a process for producing a leather grain mobile phone back cover to solve the problem that the surface texture of the existing mobile phone back cover can only be processed by thin coating and cannot achieve leather grain texture processing.

[0005] In order to achieve the above-mentioned purpose, the solution of the present invention is: a production process of a leather grain mobile phone back cover, including a surface treatment process, wherein the surface treatment process is implemented by the following steps:

[0006] Step 1: Prepare glue. Prepare polyacrylate resin, acrylic monomer and auxiliary agent to obtain prepared glue. Transfer the prepared glue to the molding area. Place the front side of the composite board on the working platform of the molding area. Then add light curing agent to the prepared glue and stir evenly to obtain the glue for use. The viscosity of the glue for use is 3800±1000mpa.s. The mass ratio of polyacrylate resin, acrylic monomer, auxiliary agent and light curing agent is as follows:

[0007]

[0008] Step 2: Glue dispensing: within 3.5-4.5 hours, the glue used in step 1 is dispensed on the molding surface of the PC sub-diaphragm with a thickness of 0.8-1.2 mm. The molding surface of the PC sub-diaphragm is provided with a leather grain texture structure that matches the leather grain and depth. Then, the composite sheet to be processed is installed on the workbench and is located above the PC sub-diaphragm and aligned with the PC sub-diaphragm up and down.

[0009] Step 3, rolling, hot rolling is performed on the composite board in step 2 with a roller, the roller temperature is 65-80°C, the roller speed is 2.2-2.8m / min, after rolling, the glue is completely spread on the front of the composite board, and the final thickness of the glue is 60-80um, to obtain a finished product to be cured;

[0010] Step 4: UV curing: Place the finished product from step 3 on the UV curing line for the first LED light curing. The curing energy is 5000-6000mj / cm 2 , curing light intensity is 2000-3000mW / cm 2 , and obtain a UV-cured part;

[0011] Step 5, baking, after the PC sub-film is removed from the UV-cured part of step 4, the part is placed in a baking processing line for baking, the baking temperature is 75-90°C, the temperature time is 3.5-5 hours, and after baking, a mobile phone back cover with a leather grain texture and hand feel is obtained;

[0012] The baking processing line comprises a drying conveying tunnel and a lifting and conveying mechanism respectively arranged outside the feeding end and the discharging end of the drying conveying tunnel; the drying conveying tunnel comprises an upper conveying line and a lower conveying line; the lifting and conveying mechanism comprises a frame body, the frame body comprises a transfer channel falling into the range of the upper conveying line and the lower conveying line; a conveying frame which can be lifted and moved up and down and can convey UV-cured parts is arranged in the transfer channel; a docking mechanism which can dock and convey with the upper conveying line or the lower conveying line respectively is installed on the conveying frame.

[0013] The conveying direction of the upper conveyor line and the lower conveyor line is left and right. The frame body has a side plate body and a front plate body and a rear plate body located at the front and rear sides of the side plate body. The side plate body, the front side plate and the rear plate body form a strip channel whose opening faces the drying conveying tunnel and extends in the up and down directions. This strip channel is the transfer channel. The front plate body and the rear plate body are both provided with a synchronously lifting linear drive mechanism. The conveyor frame is located between the two linear drive mechanisms and is connected to the driving method for lifting the conveyor frame.

[0014] The linear drive mechanism includes two vertically arranged slide rails, a first motor and a mounting seat above the first motor are provided between the two slide rails, a screw rod is provided between the first motor and the mounting seat, the lower end of the screw rod is connected to the output shaft of the first motor, and the upper end is rotatably connected to the mounting seat, and a slider screwed with the screw rod is also sleeved on the screw rod, the slider is in concave-convex sliding cooperation with the two slide rails, and the conveying frame is installed on the slider.

[0015] The conveying frame includes two mounting side plates arranged opposite to each other in front and back, the mounting side plates are mounted on the sliders, and the two mounting side plates are located between the two sliders. A plurality of conveying rollers are arranged horizontally and spaced apart in the left-right direction between the two mounting side plates.

[0016] The docking mechanism includes a first hinge seat and a second hinge seat. The first hinge seats are respectively provided on the side of the two mounting side plates facing the drying and conveying tunnel, and the second hinge seats are respectively provided on the bottom of the two mounting side plates. The two first hinge seats are movably hinged with swing arms that can be vertically arranged and can swing upward. A plurality of transfer rollers that are horizontally arranged and spaced from top to bottom are provided between the two swing arms. Each rotating roller is rotatably installed on the swing arm, and a third hinge seat is provided at the lower end of the swing arm. A driving cylinder that is arranged in a downward tilt is installed on the second hinge seat, and the output end of the driving cylinder is movably hinged to the third hinge seat.

[0017] The swing arm has a vertical portion and a bending portion, the bending portion is composed of a vertical plate and a lower horizontal plate, one end of the lower horizontal plate is vertically arranged at the outer side of the upper end of the vertical portion, the vertical plate is arranged opposite to the vertical portion, the lower end of the vertical plate is vertically arranged at the other end of the lower horizontal plate, the vertical plate, the lower horizontal plate and the vertical portion form an open mounting groove, the first hinge seat is composed of two horizontal plates facing each other front and back, one of the horizontal plates is in the mounting groove, and the other horizontal plate is outside the vertical plate, the vertical plate, the two horizontal plates and the vertical portion are connected in series through a pin shaft.

[0018] After adopting the above technical scheme, a leather grain mobile phone back cover production process of the present invention utilizes specific glue, baking method and transfer operation to enable the mobile phone back cover to be thickly coated on the surface, thereby enabling the surface texture of the mobile phone back cover to achieve a leather grain effect with a deeper texture and a thick feel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The baking processing line of the present invention;

[0020] Figure 2 is a schematic diagram of a lifting and conveying mechanism;

[0021] Figure 3 A schematic diagram of a conveyor rack. DETAILED DESCRIPTION

[0022] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.

[0023] The present invention provides a process for producing a leather grain mobile phone back cover, comprising a surface treatment process, wherein the surface treatment process is implemented by the following steps:

[0024] Step 1: Prepare glue. Prepare polyacrylate resin, acrylic monomer and auxiliary agent to obtain prepared glue. Transfer the prepared glue to the molding area. Place the front side of the composite board on the working platform of the molding area. Then add light curing agent to the prepared glue and stir evenly to obtain the glue for use. The viscosity of the glue for use is 3800±1000mpa.s, and the viscosity is preferably 2800mpa.s. The mass ratio of polyacrylate resin, acrylic monomer, auxiliary agent and light curing agent is as follows:

[0025]

[0026] Among them, the additive is the additive commonly used in UV glue now, which is a well-known technology;

[0027] Step 2, glue dispensing. Within 3.5-4.5 hours, the glue used in step 1 is dispensed on the molding surface of the PC sub-diaphragm with a thickness of 0.8-1.2 mm. The molding surface of the PC sub-diaphragm is provided with a leather grain structure that matches the leather grain and depth. The glue is preferably used within 4 hours. If it exceeds 4 hours, the glue will deteriorate and cannot be used, that is, the thick coating operation cannot be achieved. The thickness is preferably 1 mm, so that the texture can be deeper. Then, the composite sheet to be processed is installed on the workbench and is located above the PC sub-diaphragm and is aligned with the PC sub-diaphragm up and down.

[0028] Step 3, rolling, hot rolling is performed on the composite board in step 2 with a roller, the roller temperature is 65-80°C, the roller temperature is preferably 70°C, the roller speed is 2.2-2.8m / min, and after rolling, the glue is completely spread on the front of the composite board without the effect of glue breaking, and the final thickness of the glue is 60-80um, and a finished product to be cured is obtained;

[0029] Step 4: UV curing: Place the finished product from step 3 on the UV curing line for the first LED light curing. The curing energy is 5000-6000mj / cm 2 , curing light intensity is 2000-3000mW / cm 2 , and obtain a UV-cured part;

[0030] Step 5, baking, after the PC sub-film is removed from the UV-cured part of step 4, the part is placed in a baking processing line for baking, the baking temperature is 75-90°C, the temperature time is 3.5-5 hours, and after baking, a mobile phone back cover with a leather grain texture and hand feel is obtained;

[0031] like Figure 1-3 As shown, the baking processing line has a drying conveying tunnel and a lifting and conveying mechanism respectively arranged outside the feeding end and the discharging end of the drying conveying tunnel. The drying conveying tunnel has a frame 1 and an upper conveying line 11 and a lower conveying line 12 installed on the frame. The upper conveying line 11 and the lower conveying line 12 are both conveyor belts, and the conveyor belts are conveying metal meshes with heat dissipation holes. The installation of the conveyor belts on the frame is a well-known technology. The top surface of the frame 1 is located at the upper conveying line and a heat curing box 2 is fixed therein to partially hide the upper conveying line. This heat curing box 2 is a well-known box. The upper conveying line is located on the outside of one side of the heat curing box as the input end, and the part located outside the opposite side of the heat curing box as the output end. Correspondingly, the side of the lower conveying line located outside the range of the heat curing box is the input end, and the other side located outside the range of the heat curing box is the output end. The frame is located at the output end of the upper conveying line and a cold air heat dissipation device (not shown in the figure) is installed above the upper conveying line.

[0032] The lifting and conveying mechanism includes a frame 3, and the conveying direction of the upper conveying line and the lower conveying line is the left and right direction. The frame 3 is placed outside the left and right ends of the frame 1, and the frame 3 has a transfer channel that falls into the range of the upper conveying line and the lower conveying line. The transfer channel is provided with a conveying frame that can be lifted up and down and can convey UV-cured parts. The conveying frame is equipped with a docking mechanism that can dock with the upper conveying line or the lower conveying line for transportation.

[0033] Specifically, if Figure 2 As shown, the frame 3 has a side panel 31 and a front panel 32 and a rear panel 33 located at the front and rear sides of the side panel. The side panel 31, the front side panel 32 and the rear panel 33 form a strip channel whose opening faces the drying conveying tunnel and extends in the up and down directions. This strip channel is the transfer channel. The front panel and the rear panel are both provided with a synchronously lifting linear drive mechanism. The conveying frame is located between the two linear drive mechanisms and is connected to the means for driving the conveying frame to lift.

[0034] Preferably, the linear drive mechanism includes two vertically arranged slide rails 34, the slide rails 34 are arranged at a relative interval on the left and right, a first motor 35 and a mounting seat 36 above the first motor are provided between the two slide rails 34, a screw rod 37 is provided between the first motor 35 and the mounting seat 36, the output shaft of the first motor 35 is arranged upward, the lower end of the screw rod 37 is directly fixedly connected to the output shaft of the first motor 35, or is connected through a reducer, the upper end of the screw rod 37 extends into the mounting seat and is rotatably installed in the mounting seat 36 through a bearing, and a slider 38 screwed with the screw rod is also sleeved on the screw rod 37, the slider 38 is a strip-shaped block extending in the front and rear directions, the slider is in concave-convex sliding cooperation with the two slide rails, that is, a slide groove is concavely provided on the slider, and a rail is convexly provided on the slide rail, and the conveying frame is installed on the slider 38.

[0035] The conveying frame includes two mounting side plates 41 arranged opposite to each other in the front and rear directions, and the two mounting side plates are respectively locked and mounted on the opposite surfaces of the two sliders, and the two mounting side plates 41 are located between the two sliders. A plurality of conveying rollers 42 are arranged horizontally and spaced apart in the left and right directions between the two mounting side plates, and the two ends of each conveying roller 42 are correspondingly rotatably mounted on the two mounting side plates, and each conveying roller is driven and matched by a transmission mechanism. This transmission mechanism is a well-known technology, that is, the cooperation of a transmission gear and a transmission chain, which will not be described here, and the rotation of the conveying roller can also be driven by the cooperation of a motor and a transmission mechanism.

[0036] The docking mechanism includes a first hinge seat and a second hinge seat. The two mounting side panels 41 are respectively provided with the first hinge seat 51 on one side facing the drying and conveying tunnel. The first hinge seat 51 is composed of two front-to-back opposite horizontal plates. The bottoms of the two mounting side panels 41 are respectively provided with second hinge seats 52. The second hinge seat 52 is composed of two front-to-back opposite vertical plates. The two first hinge seats 51 are both movably hinged with a swing arm 53 that can be vertically arranged and can swing upward, that is, the swing arm 53 has a vertical portion and a bending portion, and the bending portion is composed of a vertical plate and a lower horizontal plate. One end of the lower horizontal plate is perpendicularly arranged to the outer side of the upper end of the vertical portion, the vertical plate is arranged opposite to the vertical portion, and the lower end of the vertical plate is perpendicularly arranged to the other end of the lower horizontal plate. The vertical plate, the lower horizontal plate and the vertical portion form an open mounting groove, and one of the horizontal plates is at The vertical plate, the two horizontal plates and the vertical part are connected in series through a pin shaft, and the pin shaft can be used to realize the up and down swinging setting of the swing arm 53; a plurality of horizontally arranged transfer rollers 54 are arranged from top to bottom between the two swing arms 53, and each rotating roller 54 is rotatably installed on the swing arm 53 through a mounting bearing, and a third hinge seat 55 is provided on the side of the lower end of the swing arm 53 facing the mounting side plate. This third hinge seat 54 is also composed of two front and rear opposite vertical plates. A driving cylinder 56 is installed on the second hinge seat 52 in a downwardly inclined manner, and the cylinder body of the driving cylinder 56 is movably hinged to the second hinge seat 52, and the free end of the piston rod of the driving cylinder 56 is movably hinged to the third hinge seat 55. During use, when the driving cylinder 56 works, the piston rod extends, and the extension of the piston rod pushes the lower end of the swing arm upward, so that the swing arm 53 is almost flat, so that the rotating rollers 54 are arranged at intervals on the left and right and can be on the same plane with the conveying roller 42.

[0037] The present invention discloses a production process for a leather grain mobile phone back cover. The self-made glue makes the glue a low-viscosity fluid, and the glue can be applied by dispensing, which avoids the problem that the traditional transfer glue cannot be applied by dispensing and thick coating. In this way, the surface of the mobile phone back cover can be coated with thicker glue. In this way, a deeper texture can be printed on the glue during transfer roller pressing, and the leather grain texture processing is realized. At the same time, under the premise of the self-matched glue, the self-developed baking line and the transfer operation method are combined to obtain the formation of the leather grain feel and texture. In this process, attention must be paid to the use time of the glue. Once the specified time is exceeded, the glue cannot be operated. This is different from the traditional glue that is directly prepared and sold in the factory. In addition, the use time of the glue is regulated by the manufacturer. The specific baking line of the patent application requires that the back cover of the mobile phone be baked after the traditional UV curing. The setting of the baking production line prevents the homemade glue from degumming and cracking, and the baking production line with such a structure can keep the back cover of the mobile phone in a circulating operation. During baking, in order to avoid cracking, after drying in the heat curing box 2 for 1 hour, the output is cooled by a cooling system, and then sent to the upper conveyor line through the lower conveyor line for drying again after cooling. When drying in multiple cycles, the conveyor rack is used for transfer to ensure that the conveying process does not cause the product to shake and the surface texture is stable. In addition, when not circulating, the product to be heat-cured can be placed on the conveyor rack for waiting, thereby improving work efficiency.

[0038] The above embodiments do not limit the method of the present invention, and any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present invention.

Claims

1. A process for producing a leather grain mobile phone back cover, including a surface treatment process, characterized in that: This is accomplished by the following steps: Step 1: Prepare glue. Prepare the polyacrylate resin, acrylic monomer and additives to obtain the prepared glue. Transfer the prepared glue to the molding area. Place the composite board with the front side facing up on the working platform of the molding area. Then add the light curing agent to the prepared glue and stir evenly to obtain the used glue. The viscosity of the used glue is 3800± 1000mpa.s, and the mass ratio of polyacrylate resin, acrylic monomer, additive and light curing agent is as follows: Step 2: Glue dispensing: within 3.5-4.5 hours, the glue used in step 1 is dispensed on the molding surface of the PC sub-diaphragm with a thickness of 0.8-1.2 mm. The molding surface of the PC sub-diaphragm is provided with a leather grain texture structure that matches the leather grain and depth. Then, the composite sheet to be processed is installed on the workbench and is located above the PC sub-diaphragm and aligned with the PC sub-diaphragm up and down. Step 3, rolling, hot rolling is performed on the composite board in step 2 with a roller, the roller temperature is 65-80°C, the roller speed is 2.2-2.8m / min, after rolling, the glue is completely spread on the front of the composite board, and the final thickness of the glue is 60-80um, to obtain a finished product to be cured; Step 4: UV curing: Place the finished product from step 3 on the UV curing line for the first LED light curing. The curing energy is 5000-6000mj / cm 2 , curing light intensity is 2000-3000mW / cm 2 , and obtain a UV-cured part; Step 5, baking, after the PC sub-film is removed from the UV-cured part of step 4, the part is placed in a baking processing line for baking, the baking temperature is 75-90°C, the temperature time is 3.5-5 hours, and after baking, a mobile phone back cover with a leather grain texture and hand feel is obtained; The baking processing line comprises a drying conveying tunnel and a lifting and conveying mechanism respectively arranged outside the feeding end and the discharging end of the drying conveying tunnel; the drying conveying tunnel comprises an upper conveying line and a lower conveying line; the lifting and conveying mechanism comprises a frame body, the frame body comprises a transfer channel falling into the range of the upper conveying line and the lower conveying line; a conveying frame which can be lifted and moved up and down and can convey UV-cured parts is arranged in the transfer channel; a docking mechanism which can dock and convey with the upper conveying line or the lower conveying line respectively is installed on the conveying frame.

2. The process for producing a leather grain mobile phone back cover according to claim 1, characterized in that: The conveying direction of the upper conveyor line and the lower conveyor line is left and right. The frame body has a side plate body and a front plate body and a rear plate body located at the front and rear sides of the side plate body. The side plate body, the front side plate and the rear plate body form a strip channel whose opening faces the drying conveying tunnel and extends in the up and down directions. This strip channel is the transfer channel. The front plate body and the rear plate body are both provided with a synchronously lifting linear drive mechanism. The conveyor frame is located between the two linear drive mechanisms and is connected to the driving method for lifting the conveyor frame.

3. The process for producing a leather grain mobile phone back cover according to claim 2, characterized in that: The linear drive mechanism includes two vertically arranged slide rails, a first motor and a mounting seat above the first motor are provided between the two slide rails, a screw rod is provided between the first motor and the mounting seat, the lower end of the screw rod is connected to the output shaft of the first motor, and the upper end is rotatably connected to the mounting seat, and a slider screwed with the screw rod is also sleeved on the screw rod, the slider is in concave-convex sliding cooperation with the two slide rails, and the conveying frame is installed on the slider.

4. The process for producing a leather grain mobile phone back cover according to claim 3, characterized in that: The conveying frame includes two mounting side plates arranged opposite to each other in front and back, the mounting side plates are mounted on the sliders, and the two mounting side plates are located between the two sliders. A plurality of conveying rollers are arranged horizontally and spaced apart in the left-right direction between the two mounting side plates.

5. The process for producing a leather grain mobile phone back cover according to claim 4, characterized in that: The docking mechanism includes a first hinge seat and a second hinge seat. The first hinge seats are respectively provided on the side of the two mounting side plates facing the drying and conveying tunnel, and the second hinge seats are respectively provided on the bottom of the two mounting side plates. The two first hinge seats are movably hinged with swing arms that can be vertically arranged and can swing upward. A plurality of transfer rollers that are horizontally arranged and spaced from top to bottom are provided between the two swing arms. Each rotating roller is rotatably installed on the swing arm, and a third hinge seat is provided at the lower end of the swing arm. A driving cylinder that is arranged in a downward tilt is installed on the second hinge seat, and the output end of the driving cylinder is movably hinged to the third hinge seat.

6. The process for producing a leather grain mobile phone back cover according to claim 5, characterized in that: The swing arm has a vertical portion and a bending portion, the bending portion is composed of a vertical plate and a lower horizontal plate, one end of the lower horizontal plate is vertically arranged at the outer side of the upper end of the vertical portion, the vertical plate is arranged opposite to the vertical portion, the lower end of the vertical plate is vertically arranged at the other end of the lower horizontal plate, the vertical plate, the lower horizontal plate and the vertical portion form an open mounting groove, the first hinge seat is composed of two horizontal plates facing each other front and back, one of the horizontal plates is in the mounting groove, and the other horizontal plate is outside the vertical plate, the vertical plate, the two horizontal plates and the vertical portion are connected in series through a pin shaft.

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