A substrate frame gradient dyeing device and method

Abstract

The present disclosure provides a substrate frame gradient dyeing device and method. The device includes a fixture and a hot pressing unit for accommodating the fixture; the fixture includes a fixture bottom groove (1) and a fixture cover body (3); there is a cavity between the fixture bottom groove (1) and the fixture cover body (3), and the cavity is used for accommodating a substrate and a transfer film (2). The fixture bottom groove (1) has an inner surface matching the substrate, and the fixture cover body (3) has an inner surface matching the transfer film (2). By using this device to perform gradient dyeing on the substrate frame, a natural transition gradient color and a colorful personalized pattern effect can be produced on the surface of the substrate frame.

Description

Technical Field

[0001] This application relates to the technical field of terminals, and particularly to a device and method for gradient dyeing of a substrate frame. Background Art

[0002] Currently, anodic oxidation and secondary anodic oxidation methods are mostly used for dyeing the middle frames of mobile phones, camera decorative parts, and the peripheral sides of notebook computer casings. However, due to the limitations of the sizes of positions such as the middle frames of mobile phones, camera decorative parts, and the peripheral sides of notebook computer casings, after the anodic oxidation treatment of the metal casing, by changing the length of the soaking time of different positions of the casing in the dye, a gradient color can be obtained. However, due to the relatively small sizes of the general side walls and middle frames, it is not easy to control the difference in the length of the anodic soaking time in the dye. After anodic oxidation, after the anodic film is dyed, one or two colors with obvious boundaries can be uniformly presented on the 2-10 mm narrow edges such as the middle frames of mobile phones, camera decorative parts, and the peripheral sides of notebook computer casings. The narrow edges are generally made of solid colors or double colors are made by secondary anodization, without a gradient effect.

[0003] The heat transfer printing technology is a method of heat transfer printing on the surface of an object. The transfer film is cut, sewn or sealed and then wrapped on the surface of the object. Then, pressure is applied to the entire surface of the object, and a vacuum is used to make the transfer film adhere tightly to the surface of the object. Then, through heating and baking, the pattern on the transfer film is transferred to the surface of the object. It can make the transfer film adhere tightly to the surface of the object, avoiding the situation of misplacement or discontinuity of the transferred pattern, and is not restricted by the shape of the object surface. Patterns can be transferred on the surface of any shape and size of the object. However, when making small-size gradient graphics, it is very easy to have obvious color transitions at the intersections of the gradients, and the transferred pattern on the material still shows an unnatural gradient transition phenomenon.

[0004] Therefore, there is an urgent need to provide a gradient dyeing method and device different from the anodic process and the simple heat transfer printing process, which can produce a natural transition gradient color and a colorful personalized pattern effect on the surface of the substrate frame. Summary of the Invention

[0005] The purpose of the present disclosure is to overcome the problem in the prior art that the substrate frame is restricted by size and cannot produce a gradient effect, and to provide a device and method for gradient dyeing of a substrate frame. By using this gradient dyeing device to perform gradient dyeing on the substrate frame, a natural transition gradient color and a colorful personalized pattern effect can be produced on the surface of the substrate frame, and the process is simple and the transfer efficiency is high.

[0006] To achieve the above purpose, in the first aspect of the present disclosure, a device for gradient dyeing of a substrate frame is provided. The device includes a jig and a hot pressing unit for accommodating the jig; the jig includes a jig bottom groove (1) and a jig cover body (3);

[0007] There is a cavity between the fixture bottom groove (1) and the fixture cover body (3), and the cavity is used to accommodate the substrate and the transfer film (2). The fixture bottom groove (1) has an inner surface matching the substrate, and the fixture cover body (3) has an inner surface matching the transfer film (2).

[0008] The second aspect of the present disclosure provides a method for gradient dyeing the frame of a substrate by using the device described in the first aspect. The method includes:

[0009] After fixing the fixture bottom groove (1), the substrate, the transfer film (2) and the fixture cover body (3), send them into the hot pressing unit for hot pressing treatment to obtain a transferred substrate; perform a sealing layer treatment on the frame of the transferred substrate.

[0010] Through the above technical solutions, the present disclosure provides a device for gradient dyeing the frame of a substrate. The device is provided with a fixture and a hot pressing unit capable of accommodating the fixture. During thermal transfer, the transferred pattern is sublimated by heat and penetrates through the gap between the fixture and the substrate to the surface of the substrate frame, forming a gradient effect.

[0011] Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific implementation manners, they are used to explain the present disclosure, but do not constitute a limitation to the present disclosure. In the drawings:

[0013] Figure 1 is a schematic structural diagram of the gradient dyeing device provided by the present disclosure.

[0014] Figure 2 is the substrate after gradient dyeing in Example 1. SPECIFIC IMPLEMENTATION MANNERS

[0015] The following provides a detailed description of the specific implementation manners of the present disclosure. It should be understood that the specific implementation manners described herein are only used to illustrate and explain the present disclosure and are not used to limit the present disclosure.

[0016] The first aspect of the present disclosure provides a device for gradient dyeing a small-sized substrate. The device includes a fixture and a hot pressing unit for accommodating the fixture; the fixture includes a fixture bottom groove (1) and a fixture cover body (3);

[0017] There is a cavity between the fixture bottom groove (1) and the fixture cover body (3), and the cavity is used to accommodate the substrate and the transfer film (2). The fixture bottom groove (1) has an inner surface matching the substrate, and the fixture cover body (3) has an inner surface matching the transfer film (2).

[0018] In one embodiment, the size of the substrate is smaller than the inner surface size of the bottom groove (1) of the fixture, and the gap size between the outer sidewall of the substrate and the inner sidewall of the bottom groove (1) of the fixture is determined according to the required gradient size of the substrate, and can be 0.1 - 5 mm, preferably 0.5 - 2 mm.

[0019] The size of the transfer sheet (2) is larger than the inner surface size of the fixture cover (3), which is convenient for being fixed between the substrate and the fixture cover (3); the size difference between the outer sidewall of the transfer sheet (2) and the inner sidewall of the fixture cover (3) is 5 - 15 mm, preferably 5 - 10 mm;

[0020] The height of the substrate is not higher than the height of the bottom groove (1) of the fixture;

[0021] Optionally, the substrate can be the frame of electronic devices such as the middle frame of a mobile phone, the camera decoration piece, and the notebook shell, and the size of the substrate frame is preferably 2 - 10 mm.

[0022] In one embodiment, a transfer pattern is printed on the surface of the transfer sheet (2).

[0023] In the second aspect of the present disclosure, a method for gradient dyeing of a substrate frame using the device described in the first aspect is provided, and the method includes:

[0024] Fix the bottom groove (1) of the fixture, the substrate, the transfer sheet (2) and the fixture cover (3) in sequence and then send them into the hot pressing unit for hot pressing treatment to obtain a transferred substrate; perform a sealing layer treatment on the frame of the transferred substrate.

[0025] In one embodiment, the transfer pattern on the surface of the transfer sheet (2) is drawn by heat - sublimable ink and / or dye.

[0026] In the method for gradient dyeing of the substrate frame described in the present disclosure, after the fixture, the substrate and the transfer sheet (2) are fixed and sent into the hot pressing unit to be pressurized and heated, the transfer pattern drawn by heat - sublimable ink and / or dye on the transfer sheet (2) sublimes and then penetrates downward through the gap between the fixture and the substrate to the surface of the substrate frame. The part of the substrate frame in contact with the transfer sheet (2) has a deeper transferred color, and the part far from the transfer sheet (2) has a lighter transferred color, presenting a visual gradient effect.

[0027] In one embodiment, the material of the transfer sheet (2) is selected from at least one of transfer paper, transfer film, and transfer film.

[0028] In a preferred embodiment, the transfer sheet (2) is preferably transfer film.

[0029] In one embodiment, the conditions of the hot pressing treatment include: the treatment temperature is 120 - 200 °C, preferably 160 - 180 °C; the treatment time is 3 - 20 min, preferably 8 - 15 min; the pressure is 0 to -0.1 MPa, preferably -0.03 to -0.08 MPa. Under these hot pressing treatment conditions, a natural and uniform gradient effect can be rapidly formed on the surface of the substrate frame.

[0030] In a preferred embodiment, the method further includes: fixing the substrate frame with a coating on its surface in a jig.

[0031] In one embodiment, the sealing layer treatment includes coating a coating on the surface of the transfer substrate frame.

[0032] The coating includes at least one of an anodic film layer, a resin liquid coating, and an ink coating; this coating can withstand high temperatures for a certain period of time.

[0033] The coating and its coating method described in the present disclosure can be coating and coating methods well-known to those skilled in the art, and are not particularly limited.

[0034] In one embodiment, the outer edge size of the transferred pattern is larger than the inner wall size of the jig bottom groove (1); the inner edge size of the transferred pattern is larger than the outer wall size of the substrate.

[0035] The present disclosure will be further described in detail below through examples. The raw materials used in the examples can all be obtained through commercial channels.

[0036] Example 1

[0037] According to Figure 1 As shown, this example provides a device including a jig and a hot pressing unit for accommodating the jig. The jig includes a jig bottom groove 1 with an inner surface length of 165 mm, a width of 77 mm, an outer surface length of 182 mm, a width of 94 mm, and a side wall height of 6 mm, and a jig cover 3 of the same size. There is a cavity between the jig bottom groove 1 and the jig cover 3 for accommodating the substrate 4 and the transfer sheet 2; in this example, the substrate is a mobile phone back shell with a length of 163 mm, a width of 75 mm, and a side wall thickness of 3 mm; the substrate frame is a mobile phone middle frame with a size of 1.5 mm; the transfer sheet has a length of 190 mm and a width of 100 mm, and the transfer sheet is a heat transfer paper printed with a wide line pattern using sublimable ink, and the pattern size has a length of 186 mm and a width of 98 mm;

[0038] Anodize the surface of the substrate frame, including placing the substrate in an anodizing jig, performing degreasing, water washing, brightening, secondary water washing, and anodizing processes, then cleaning the anodized substrate with deionized water, drying and taking it out. The anodized substrate is laid flat on the inner surface of the fixture bottom groove 1, with a gap of 2 mm between its outer wall and the inner wall of the fixture bottom groove 1. Then, the transfer film 2 and the fixture cover 3 are fixed in sequence, with a gap of 8 mm in the length direction and 6 mm in the width direction between the outer wall of the transfer film and the inner wall of the fixture cover 3. The fixed fixture is sent into the hot pressing unit and processed at 180°C and -0.06 MPa for 10 min to obtain a transferred substrate. The transferred substrate frame is immersed in a DY103 anodizing high-temperature sealing agent solution at 95°C for 30 - 50 min for sealing treatment to obtain a substrate S1 with a gradient color, as Figure 2 shown, and the gradient size is 1.5 mm.

[0039] Example 2

[0040] This example is the same as Example 1, except that the transfer film in this example is a thermal transfer film, and a substrate S2 with a gradient color is obtained, with a gradient size of 2 mm.

[0041] Example 3

[0042] This example is the same as Example 1, except that the transfer film in this example is a thermal transfer membrane, and a substrate S3 with a gradient color is obtained, with a gradient size of 2 mm.

[0043] Example 4

[0044] This example is the same as Example 1, except that the hot pressing treatment conditions in this example are: sending the fixed fixture into the hot pressing unit and processing it at 150°C and -0.04 MPa for 8 min to obtain a transferred substrate S4, with a gradient size of 1 mm.

[0045] Comparative Example 1

[0046] Adopt the traditional gradient dyeing method to anodize → dye (color 1) → seal holes → spray ink → secondary anodize → dye (color 2) → seal holes → remove ink on the aluminum alloy middle frame to obtain a dyed substrate D1.

[0047] Test Examples

[0048] Environmental Tests

[0049] Test the tolerance of the transferred substrates S1 - S4 and D1 in corresponding environments such as boiling water cross-cut, alcohol resistance, oil resistance, anti-cosmetics, UV irradiation, high temperature and high humidity, damp heat cycling, artificial sweat, neutral salt spray, and copper-accelerated salt spray under certain temperature and humidity conditions.

[0050] Fastness Test

[0051] Install the transfer substrates S1 - S4 and D1 on the whole machine and put them into a vibration friction tester for 2H testing to test vibration abrasion resistance. It is required that the continuous linear wear does not exceed 20% of the perimeter of the small parts, and there is no point wear larger than 1mm * 1mm.

[0052] The test results of this public experiment are shown in Table 1.

[0053] Table 1

[0054]

[0055] The adhesion grades (ISO 1 and ASTM) are divided into 1B, 2B, 3B, and 4B.

[0056] 4B standard: There are small pieces of peeling along the scribed grid edges or at the intersections of the knife marks, and the actual damage within the scribed grid area ≤ 5%; 3B standard: There are small pieces of peeling along the scribed grid edges, and 5% < the actual damage within the scribed grid area ≤ 10%; 2B and 1B have no adhesion: There are large pieces of peeling along the scribed grid edges, and 10% < the actual damage within the scribed grid area ≤ 30%.

[0057] From the above embodiments and comparative examples, it can be seen that by using the substrate frame gradient dyeing device and method provided by this disclosure for gradient dyeing of the substrate frame, a natural and uniform transitional gradient color is formed on the surface of the substrate frame, and colorful personalized patterns can be formed according to process requirements, which can ensure that the gradient pattern has good adhesion and fastness.

[0058] The preferred embodiments of this disclosure have been described in detail above. However, this disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all belong to the protection scope of this disclosure.

[0059] In addition, it should be noted that, in the case of no contradiction, the various specific technical features described in the above specific embodiments can be combined in any appropriate way. To avoid unnecessary repetition, this disclosure will not separately describe various possible combination methods.

[0060] In addition, any combination can be made between various different embodiments of this disclosure as long as it does not violate the idea of this disclosure, and it should also be regarded as the content disclosed by this disclosure.

Claims

1. A substrate frame gradient dyeing device, characterized in that, The device includes a jig and a hot pressing unit for accommodating the jig; the jig includes a jig bottom groove (1) and a jig cover body (3); There is a cavity between the jig bottom groove (1) and the jig cover body (3), and the cavity is used to accommodate a substrate and a transfer film (2). The jig bottom groove (1) has an inner surface matching the substrate, and the jig cover body (3) has an inner surface matching the transfer film (2); The size of the substrate is smaller than the inner surface size of the jig bottom groove (1), and the gap between the outer sidewall of the substrate and the inner sidewall of the jig bottom groove (1) is 0.1 - 5 mm; The size of the transfer film (2) is larger than the inner surface size of the jig cover body (3), and the dimensional difference between the outer sidewall of the transfer film (2) and the inner sidewall of the jig cover body (3) is 5 - 15 mm; The thickness of the substrate is not higher than the height of the jig bottom groove (1); the size of the substrate border is 2 - 10 mm; The transfer pattern on the surface of the transfer film (2) is drawn by heat - sublimable ink and / or dye.

2. The device according to claim 1, characterized in that, The gap between the outer sidewall of the substrate and the inner sidewall of the jig bottom groove (1) is 0.5 - 2 mm; The dimensional difference between the outer sidewall of the transfer film (2) and the inner sidewall of the jig cover body (3) is 5 - 10 mm.

3. The device according to claim 1, characterized in that, The surface of the transfer film (2) is printed with a transfer pattern.

4. A method for substrate frame gradient dyeing using the device according to claims 1 to 3, characterized in that, The method includes: After fixing the jig bottom groove (1), the substrate, the transfer film (2) and the jig cover body (3), feeding them into the hot pressing unit for hot pressing treatment to obtain a transferred substrate; performing a sealing treatment on the border of the transferred substrate.

5. The method according to claim 4, characterized in that, The material of the transfer film (2) is selected from at least one of transfer paper, transfer film, and transfer film.

6. The method according to claim 5, characterized in that, The transfer film (2) is a transfer film.

7. The method according to claim 4, characterized in that, The conditions of the hot pressing treatment include: treatment temperature is 120 - 200 °C; treatment time is 3 - 20 min; pressure is 0 to - 0.1 MPa.

8. The method according to claim 7, characterized in that, The conditions of the hot pressing treatment include: treatment temperature is 160 - 180 °C; treatment time is 8 - 15 min; pressure is - 0.03 to - 0.08 MPa.

9. The method according to claim 4, characterized in that, The method further includes: coating the surface of the substrate border with a coating and then fixing it in the jig; The sealing treatment includes coating a coating on the border surface of the transferred substrate; The coating includes at least one of an anodic film layer, a resin liquid coating, and an ink coating.

10. The method according to claim 4, characterized in that, The outer edge size of the transfer pattern is larger than the inner sidewall size of the jig bottom groove (1); the inner edge size of the transfer pattern is larger than the outer sidewall size of the substrate.

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