Method for manufacturing a multi-color mobile phone shell

Abstract

The application discloses a manufacturing method of a multi-color mobile phone shell, and comprises the following steps: first, PC base material is prepared by injection molding, the PC base material comprises a back plate and a peripheral side plate, and glass fiber cloth is attached to the peripheral side plate; second, the PC base material is placed in a first LSR molding mold, a detachable core is arranged, the accommodating cavity of the PC base material is sleeved on the core, and the PC base material with first color silica gel is obtained; third, the PC base material is placed in a second LSR molding mold together with the core, and the PC base material with second color silica gel is obtained; fourth, the silica gel on the outer periphery of the semi-finished product is polished on the outer side, and the silica gel at the hole of the semi-finished product is polished on the inner side; fifth, a printing device is used to print a LOGO mark on the second color silica gel; and sixth, a touch ink layer is sprayed on the surfaces of the first color silica gel and the second color silica gel. The attached glass fiber cloth enhances the structural strength, the universal core can ensure the size precision of the two molds, and the LOGO mark is printed to reduce damage to the PC base.

Description

Technical Field

[0001] This invention relates to the field of mobile phone cases, and in particular to a method for manufacturing a multi-colored mobile phone case. Background Technology

[0002] Currently, protective cases are used on electronic products such as mobile phones, mainly for protecting the back of the phone.

[0003] In the prior art, such as the mobile phone case kit disclosed in Chinese Patent ZL202120504033.5, there is a hard inner sleeve and an elastic outer sleeve. The hard inner sleeve includes a back panel, and the upper end and left and right sides of the back panel are respectively provided with an upper edge, a left edge and a right edge. The left edge or the right edge has a cut to avoid the mobile phone buttons. The elastic outer sleeve is also provided with a side sleeve to surround the four sides of the mobile phone. The setting of the cut makes the side sleeve in a suspended state at the cut, which has low strength. Moreover, since the side buttons are frequently used, the side sleeve at that location is prone to breakage, thereby affecting the normal use of the mobile phone case.

[0004] Two-color molded phone cases have also appeared on the market. These two-color phone cases are made by a two-color molding machine. The two colors of the phone case are prone to glue mixing and color mixing, and even gaps may appear between the two colors, affecting the appearance of the phone case.

[0005] Furthermore, in the existing technology, the product logo is pressed onto the PC substrate using hydraulic pressure. This method can cause the PC substrate to deform, requiring the PC substrate to be machined flat using CNC machining, which is a cumbersome process.

[0006] Therefore, it is necessary to design a new technical solution to solve the above problems. Summary of the Invention

[0007] In view of this, the present invention addresses the deficiencies of the existing technology, and its main objective is to provide a method for manufacturing a multi-color mobile phone case. By attaching fiberglass cloth, the structural strength of the peripheral plate at the location of the side key hole is enhanced, making the product less prone to breakage during use. Furthermore, the first LSR molding mold is detachably equipped with a core, which can be used in both the first and second LSR molding molds, ensuring the dimensional accuracy of the two molds. This prevents color bleeding between the first and second color silicone after molding and ensures a smoother connection. Additionally, the logo is printed on the second color silicone, reducing the damage of the logo to the PC substrate.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A method for manufacturing a multi-colored phone case includes the following steps:

[0010] The first step is to injection mold a PC substrate, which includes a back plate and a peripheral side plate located on the front side of the back plate. The back plate and the peripheral side plate form an accommodating cavity. The back plate has a camera hole, and the peripheral side plate has a side key hole. Then, a fiberglass cloth is attached to the end of the peripheral side plate away from the back plate. The fiberglass cloth corresponds to the location of the side key hole. The fiberglass cloth enhances the structural strength of the peripheral side plate at the location of the side key hole, making the product less prone to breakage during use. Then, the PC substrate with the fiberglass cloth is cleaned and dried.

[0011] The second step involves placing the PC substrate into the first LSR molding mold. The first LSR molding mold is detachably equipped with a core. The accommodating cavity of the PC substrate is fitted onto the core. The core is interchangeable between the first and second LSR molding molds, ensuring the dimensional accuracy of the two molds. This prevents color mixing between the first and second colored silicone after molding and ensures a smoother connection. The first colored silicone material is used to cover the outer wall of the peripheral side plate and the hole wall of the camera hole, and to cover the fiberglass cloth on the outer wall of the peripheral side plate. A first accommodating groove for accommodating the second colored silicone material is left at the side key hole position. A second accommodating groove for accommodating the second colored silicone material is left between the first colored silicone material at the rear end of the peripheral side plate and the first colored silicone material at the camera hole position, resulting in a PC substrate with the first colored silicone.

[0012] The third step is to place the PC substrate with the first color silicone along with the core into the second LSR molding mold, cover the first and second receiving grooves with the second color silicone material, and connect it with the first color silicone to obtain the PC substrate with the second color silicone, forming a semi-finished product.

[0013] The fourth step is to grind the silicone on the outer periphery of the semi-finished product on the outside and grind the silicone at the holes in the semi-finished product on the inside. After grinding, clean and dry.

[0014] The fifth step is to place the dried semi-finished product flat on a printing jig and use a printing device to print the logo on the second color silicone on the back side of the back plate to reduce the damage of the logo to the PC substrate. After printing, the printing is baked.

[0015] The sixth step is to install a masking fixture in the accommodating cavity to prevent spraying onto the front side of the back panel and the inner wall of the peripheral side panel during the spraying operation. Then, the semi-finished product with the masking fixture is placed into an electrostatic dust collector for electrostatic dust removal. Next, a tactile ink layer is sprayed onto the surface of the first and second color silicone. Finally, the product is sprayed and baked to obtain the finished product.

[0016] As a preferred embodiment, in the first step, the fiberglass cloth is hot-pressed onto the peripheral side plate, wherein the hot-pressing temperature is 95-105 degrees Celsius, the pressure holding temperature is 95-100 degrees Celsius, and the air pressure is 0.4-0.6 MPa.

[0017] As a preferred option, in the fourth step, the outer surface is polished using an automatic polishing device, which includes a robot and a polishing fixture. The robot is equipped with sponge abrasive. After the semi-finished product is placed on the polishing fixture, the robot polishes the outer surface using the sponge abrasive.

[0018] As a preferred option, in the fourth step, the inner side is polished manually.

[0019] As a preferred option, in step five, the baking temperature is 85-95 degrees Celsius and the baking time is 60 minutes.

[0020] As a preferred option, in the fifth step, a roller is used to remove dirt from the semi-finished product before printing to ensure the cleanliness of the printing surface and thus ensure printing quality.

[0021] As a preferred option, in step six, the baking temperature is 95-105 degrees Celsius and the baking time is 120 minutes.

[0022] As a preferred option, in step six, after installing the masking fixture, adhesive tape is used to remove dirt from the top, bottom, left, right, and rear surfaces of the semi-finished product to ensure the cleanliness of the sprayed surface and thus ensure the spraying quality.

[0023] As a preferred option, sulfurization is performed after both printing and baking and spraying and baking.

[0024] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solution:

[0025] The main features are as follows: by attaching fiberglass cloth, the structural strength of the peripheral plate at the location of the side key hole is enhanced, making the product less prone to breakage during use. In addition, the first LSR molding mold is detachably equipped with a core, which can be used in both the first and second LSR molding molds, ensuring the dimensional accuracy of the two molds. This prevents color bleeding between the first and second color silicone after molding and makes the connection smoother. Furthermore, the logo is printed on the second color silicone, reducing the damage of the logo to the PC substrate.

[0026] To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0027] Figure 1 This is a perspective view of a multi-colored mobile phone case according to a preferred embodiment of the present invention;

[0028] Figure 2 This is another perspective view of a multi-colored mobile phone case according to a preferred embodiment of the present invention;

[0029] Figure 3 This is an exploded view of a multi-colored mobile phone case according to a preferred embodiment of the present invention;

[0030] Figure 4 This is a cross-sectional view of the side key hole of a multi-colored mobile phone case according to a preferred embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the first LSR molding die according to a preferred embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the second LSR molding die according to a preferred embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of the installation of the core and core holder according to a preferred embodiment of the present invention;

[0034] Figure 8 This is a cross-sectional schematic diagram of the core and core holder according to a preferred embodiment of the present invention.

[0035] Explanation of reference numerals in the attached diagram:

[0036] 10. PC substrate 11. Backing plate

[0037] 111. Camera hole; 112. Vent hole

[0038] 12. Side plate 121. Side keyhole

[0039] 122. Mounting slot 101. Receiving cavity

[0040] 20. Fiberglass cloth; 30. First LSR molding die

[0041] 301, Core 3011, Installation Section

[0042] 3012, Support unit 302, Core base

[0043] 303, Card slot; 304, Support arm

[0044] 305. Mounting slot; 306. Fastener.

[0045] 307, Elastic component 40, First color silicone

[0046] 401, First receiving slot; 402, Second receiving slot

[0047] 50. Second LSR molding die; 60. Second color silicone.

[0048] 70. Logo / Identification. Detailed Implementation

[0049] First, it should be noted that in the description of this invention, the terms "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0050] Please refer to Figures 1 to 8 As shown, it illustrates the specific structure of a preferred embodiment of the present invention, including the following steps:

[0051] The first step is to injection mold a PC substrate 10, which includes a back plate 11 and a peripheral side plate 12 located on the front side of the back plate 11. The back plate 11 and the peripheral side plate 12 form an accommodating cavity 101. The back plate 11 is provided with a camera hole 111, and the peripheral side plate 12 is provided with a side key hole 121. Then, a fiberglass cloth 20 is attached to the end of the peripheral side plate 12 away from the back plate. The fiberglass cloth 20 corresponds to the location of the side key hole 121. The fiberglass cloth 20 enhances the structural strength of the peripheral side plate 12 at the location of the side key hole 121, making the product less prone to breakage during use. Then, the PC substrate 10 with the fiberglass cloth 20 is cleaned and dried.

[0052] Specifically, the fiberglass cloth 20 is hot-pressed onto the peripheral side plate 12, wherein the hot-pressing temperature is 95-105 degrees Celsius, the holding temperature is 95-100 degrees Celsius, and the air pressure is 0.4-0.6 MPa. Preferably, the outer wall surface of the peripheral side plate 12 is provided with an installation groove 122 for accommodating the fiberglass cloth 20. The installation groove 122 can prevent the fiberglass cloth 20 from excessively affecting the thickness of the first-color silicone 40 covering at that location, thereby preventing the first-color silicone 40 from protruding and affecting the overall appearance continuity of the first-color silicone 40. The cleaning is performed using ultrasonic cleaning at a temperature of 40-60 degrees Celsius. The drying temperature is 90-110 degrees Celsius.

[0053] The second step involves placing the PC substrate 10 into the first LSR molding mold 30. The first LSR molding mold 30 is detachably equipped with a core 301. The accommodating cavity 101 of the PC substrate 10 is fitted onto the core 301. The core 301 can be used in both the first LSR molding mold 30 and the second LSR molding mold 50, ensuring the dimensional accuracy of the two molds. This prevents color bleeding between the first color silicone 40 and the second color silicone 60 after molding and ensures a smoother connection. The first color silicone material is used to cover the outer wall of the peripheral side plate 12 and the hole wall of the camera hole 111, and to cover the fiberglass cloth 20 located on the outer wall of the peripheral side plate 12. A first accommodating groove 401 for accommodating the second color silicone 60 is left at the side key hole 121. A second accommodating groove 402 for accommodating the second color silicone 60 is left between the first color silicone material located at the rear end of the peripheral side plate 12 and the first color silicone material located at the camera hole 111, thus obtaining the PC substrate 10 with the first color silicone 40.

[0054] Specifically, the first receiving groove 401 is U-shaped and is located between the front end and the rear end of the first colored silicone 40. The upper surface, part of the left surface, part of the right surface of the peripheral side plate 12 and the first colored silicone 40 together form the first receiving groove 401. The side key hole 121 is located at the end of part of the right surface.

[0055] The third step is to place the PC substrate 10 with the first color silicone 40 together with the core 301 into the second LSR molding mold 50, cover the first receiving groove 401 and the second receiving groove 402 with the second color silicone 60, and connect it with the first color silicone 40 to obtain the PC substrate 10 with the second color silicone 60, forming a semi-finished product.

[0056] Specifically, the second color silicone 60 forms a convex structure at the side key hole 121 to facilitate the installation of the side key and for the user to press. When molding the second color silicone 60, there is usually a phenomenon of uneven appearance in some areas. Therefore, an exhaust hole 112 is provided in this area to improve the exhaust during LSR molding and thus improve the flatness of the appearance.

[0057] Both the first LSR molding mold 30 and the second LSR molding mold 50 have a core seat 302 for detachable installation of the core 301. The bottom of the core 301 is recessed with a groove 303, and the top of the core seat 302 is protruded with a support arm 304. The support arm 304 extends into the groove 303 and has an installation groove 305. A fastener 306 is rotatably connected in the installation groove 305. An elastic element 307 is sandwiched between one end of the fastener 306 and the core seat 302. The other end of the fastener 306 is pressed against the groove 303 by the elastic force of the elastic element 307. The core 301 is detachably mounted on the core seat 302 through the cooperation of the fastener 306 and the groove 303. The core 301 is driven to overcome the elastic force of the elastic element 307 and disengage from the core seat 302, thereby being replaced in another mold.

[0058] Preferably, the core 301 includes a mounting portion 3011 and a support portion 3012 disposed on the top of the mounting portion 3011. The support portion 3012 is used for placing the PC substrate 10. The slot 303 is recessed upward from the bottom of the mounting portion 3011. The support portion 3012 is fixed to the top of the mounting portion 3011 by screws. The screws pass through the entire mounting portion 3011 from the bottom upward and connect to the support portion 3012. There are two slots 303 arranged symmetrically on the left and right. Correspondingly, there are two support arms 304 arranged symmetrically on the left and right. The symmetrical arrangement makes the detachable connection between the core 301 and the core seat 302 more stable.

[0059] The fourth step is to grind the silicone on the outer periphery of the semi-finished product on the outside and grind the silicone at the holes in the semi-finished product on the inside. After grinding, clean and dry.

[0060] Specifically, the outer surface is polished using an automatic polishing device, which includes a robot and a polishing fixture. The robot is equipped with a sponge abrasive. After the semi-finished product is placed on the polishing fixture, the robot polishes the outer surface using the sponge abrasive. The inner surface is polished manually, using tools such as handheld polishing heads and manual polishing machines. The cleaning process uses ultrasonic cleaning at a temperature of 40-60 degrees Celsius. The drying process is carried out at a temperature of 90-110 degrees Celsius.

[0061] The fifth step is to place the dried semi-finished product flat on a printing jig and use a printing device to print the logo on the second color silicone 60 on the back side of the back plate to reduce the damage of the logo to the PC substrate. After printing, the printing is baked.

[0062] Specifically, before printing, a roller is used to remove dirt from the semi-finished product to ensure the cleanliness of the printing surface and thus ensure printing quality. After printing, the product must be removed in a dust-free manner, usually by manual removal while wearing dust-free gloves. After printing and baking, vulcanization treatment is required, with a baking temperature of 85-95 degrees Celsius and a baking time of 60 minutes.

[0063] Step 6: Install a masking fixture in the accommodating cavity 101 to prevent spraying onto the front side of the back panel and the inner wall of the peripheral side panel 12 during the spraying operation. Then, put the semi-finished product with the masking fixture into an electrostatic dust collector for electrostatic dust removal. Then, spray a tactile ink layer onto the surface of the first color silicone 40 and the second color silicone 60. Finally, spray and bake to obtain the finished product.

[0064] Specifically, before installing the masking fixture, the inner surface of the semi-finished product is cleaned with a brush dipped in cleaning agent. After installing the masking fixture, the stains on the side key area of ​​the semi-finished product are first cleaned with a brush dipped in an appropriate amount of cleaning agent. Then, the dirt and water stains on the outer surface of the semi-finished product are wiped clean with a lint-free cloth dipped in an appropriate amount of cleaning agent. Then, the dirt on the upper, lower, left, right, and rear surfaces of the semi-finished product is removed with adhesive tape to ensure the cleanliness of the sprayed surface and thus ensure the spraying quality. This completes the first cleaning. Before electrostatic dust removal, the surface of the semi-finished product is blown with a manual air gun to reduce oil stains and reduce particle and lint defects. Then, a second cleaning is performed using an electrostatic dust removal machine. After spraying and baking, vulcanization treatment is performed. The baking temperature is 95-105 degrees Celsius, and the baking time is 120 minutes. When the masking fixture is installed in the receiving cavity 101, it fits the receiving cavity 101 completely without any deviation, twisting, or warping, ensuring accurate spraying.

[0065] Normally, incoming material inspection is carried out when the raw materials for the product arrive, including IQC and MRB inspection; after the product is manufactured, an appearance inspection is carried out to ensure that the appearance is intact before it is shipped out.

[0066] Furthermore, in the actual production process, the sixth step is usually carried out on the assembly line. A hanger is set up for multiple products to be hung. The hanger is used to elevate the products for easy processing and can process multiple products at one time, which is convenient to use. An adapter is set at the bottom of the masking fixture to connect with the hanger. After the semi-finished products are installed in the masking fixture, they are installed on the hanger through the adapter.

[0067] The key design focus of this invention is:

[0068] The main features are as follows: by attaching fiberglass cloth, the structural strength of the peripheral plate at the location of the side key hole is enhanced, making the product less prone to breakage during use. In addition, the first LSR molding mold is detachably equipped with a core, which can be used in both the first and second LSR molding molds, ensuring the dimensional accuracy of the two molds. This prevents color bleeding between the first and second color silicone after molding and makes the connection smoother. Furthermore, the logo is printed on the second color silicone, reducing the damage of the logo to the PC substrate.

[0069] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A method for manufacturing a multi-colored mobile phone case, characterized in that, Includes the following steps: The first step is to injection mold a PC substrate, which includes a back plate and a peripheral side plate located on the front side of the back plate. The back plate and the peripheral side plate form an accommodating cavity. The back plate is provided with a camera hole, and the peripheral side plate is provided with a side key hole. Then, a fiberglass cloth is attached to the end of the peripheral side plate away from the back plate, and the fiberglass cloth corresponds to the location of the side key hole. Then, the PC substrate with the fiberglass cloth is cleaned and dried. The second step involves placing the PC substrate into the first LSR molding mold, which is detachably equipped with a core. The accommodating cavity of the PC substrate is fitted onto the core. The outer wall of the peripheral side plate and the hole wall of the camera hole are covered with the first color silicone material, and the fiberglass cloth on the outer wall of the peripheral side plate is covered. A first accommodating groove for accommodating the second color silicone material is left at the side key hole position. A second accommodating groove for accommodating the second color silicone material is left between the first color silicone material at the rear end of the peripheral side plate and the first color silicone material at the camera hole position, thus obtaining a PC substrate with the first color silicone. The third step is to place the PC substrate with the first color silicone along with the core into the second LSR molding mold, cover the first and second receiving grooves with the second color silicone material, and connect it with the first color silicone to obtain the PC substrate with the second color silicone, forming a semi-finished product. The fourth step is to grind the silicone on the outer periphery of the semi-finished product on the outside and grind the silicone at the holes in the semi-finished product on the inside. After grinding, clean and dry. The fifth step is to place the dried semi-finished product flat on a printing fixture and use a printing device to print the logo on the second color silicone on the back side of the back plate. After printing, the product is baked. The sixth step is to install a masking fixture in the accommodating cavity to prevent spraying onto the front side of the back panel and the inner wall of the peripheral side panel during the spraying operation. Then, the semi-finished product with the masking fixture is placed into an electrostatic dust collector for electrostatic dust removal. Next, a tactile ink layer is sprayed onto the surface of the first and second color silicone. Finally, the product is sprayed and baked to obtain the finished product.

2. The method for manufacturing a multi-color mobile phone case according to claim 1, characterized in that: In the first step, the fiberglass cloth is hot-pressed onto the peripheral side plate, wherein the hot-pressing temperature is 95-105 degrees Celsius, the pressure holding temperature is 95-100 degrees Celsius, and the air pressure is 0.4-0.6 MPa.

3. The method for manufacturing a multi-color mobile phone case according to claim 1, characterized in that: In the fourth step, the outer surface is polished using an automatic polishing device, which includes a robot and a polishing fixture. The robot is equipped with a sponge abrasive. After the semi-finished product is placed on the polishing fixture, the robot polishes the outer surface using the sponge abrasive.

4. The method for manufacturing a multi-color mobile phone case according to claim 3, characterized in that: In the fourth step, the inner side is polished manually.

5. The method for manufacturing a multi-color mobile phone case according to claim 1, characterized in that: In step five, the baking temperature is 85-95 degrees Celsius and the baking time is 60 minutes.

6. The method for manufacturing a multi-color mobile phone case according to claim 1, characterized in that: In the fifth step, a roller is used to remove dirt from the semi-finished product before printing.

7. The method for manufacturing a multi-color mobile phone case according to claim 1, characterized in that: In step six, the baking temperature is 95-105 degrees Celsius and the baking time is 120 minutes.

8. The method for manufacturing a multi-color mobile phone case according to claim 1, characterized in that: In the sixth step, after installing the masking fixture, use adhesive tape to remove dirt from the top, bottom, left, right, and rear surfaces of the semi-finished product.

9. A method for manufacturing a multi-color mobile phone case according to claim 1, characterized in that: Both printing and baking processes are followed by sulfurization.

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