In 2018, with the arrival of the 5G wave, the metal phone back cover market has further shrunk, and the non-metallic back cover continues to exert its strength. In the back cover of non-metallic materials, the drawbacks of high cost and low yield of ceramics still exist. The flagship machines of all major brands and mid-to-high-end models can only choose glass back cover, such as Huawei P20/P20 Pro (3D) and Porsche. Version (3D), OPPO R15 (3D), vivo X21 (3D)/X21 FIFA World Cup Edition (3D), Xiaomi 8 (3D) / Xiaomi 8se (2.5D).
Figure vivo X21 World Cup Extraordinary Edition
However, the back cover of the glass mobile phone, especially the 3D glass plate, has insufficient yield and the overall price is high (about 100 yuan/piece), which is not suitable for the low-end market which is very sensitive to cost. The most suitable plastic material for the low-end market, by hardening its surface hardness can reach 4-6H, scratch resistance is greatly improved; on the other hand, with the progress of surface treatment technology, plastic can also produce cool The appearance of the glass. Under such circumstances, the plastic imitation glass back cover process is also on the way.
Today, Xiaobian wants to tell you about the most beautiful IMT process in the imitation glass process.
I. Introduction to IMT Process
IMT (referred to as Insert Mold Three-dimensional) process can be understood as IMR process after 3D molding using IML injection molding and then tear off the carrier layer PET, leaving a 3D optical nano decorative layer on the plastic surface, and Traditional IMRs have added 3D optical textures and PVD color layers for greater curvature. It realizes the appearance decoration effect of three-dimensional, photo, gradient, R angle and other products, which provides a better innovation and realization platform for the design industry.
The IMT process is as follows:
Second, the unique advantages of the IMT process
1. The IMT process uses a double-layer optical texture diaphragm to produce a 3D optical effect of the separation layer, which makes the color of the product more rich and beautiful, and the resulting glass-like effect is more beautiful.
Figure IMT diaphragm
2. IMT injection molding can be used as a one-piece back cover with edging and assembly structure such as buckles, which reduces the complexity of the metal middle frame, thereby greatly reducing the cost of the overall structural parts of the mobile phone.
Figure IMT process back cover with snap-on structure
Third, the current status of IMT process
IMT can make the plastic surface very beautiful through a combination of various processes, but his shortcomings are first exposed here: IMT process is too long, there is a loss of yield in each process, and in general, it is straight through. The rate is inevitably not high, and there are rumors in the market that the overall yield of the IMT process is currently less than 50%.
On the other hand, the adhesion performance of the existing UV transfer adhesive needs to be strengthened to improve the release film yield. In the final product, in order to ensure the effect of imitation glass, its appearance requirements are very strict, and there are many types of defects. In some cases, it is necessary to sign a limit-like rule with the end customer.
summary:
The IMT process has a good effect on the glass, and can be used as a edging and an integrated back cover with a complicated assembly structure, which saves production costs, but the low yield is a big injury. This problem needs to be strengthened from the raw materials to the post-processing manufacturers in all aspects of the entire industrial chain to enhance the overall process level of the IMT industry, thereby increasing the yield and reducing costs. We believe that with a large number of old and large-scale plastic processing enterprises joining the IMT camp, it will inevitably bring a strong driving force to the IMT industry, and the new way out for the plastic cover of the mobile phone industry will be even broader.
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