With the continuous development of technological progress, smart phones have become a necessary tool for people to travel, the use of health QR codes in the case of epidemic exertion, sealing the city under the surge of e-commerce shopping prompted the smart phones have been more widely popular. Smartphone factory business in the field of cell phone technology continues to upgrade, the market for folding screen phones was birthed, the market acceptance is also gradually increasing. According to Gfk Saino data show that in 2021, folding screen phone sales of 1.1 million units, a growth rate of 187%, 2022 is expected to break through 1.8 million units of domestic folding screen sales.

Folding screens and flexible screens are commonly used in cell phones, laptops, car stretching screens, scrolling screens, etc. What is a folding screen? Folding screen refers to the screen that can be folded, the main characteristic is its flexible screen, the screen can achieve the completion of 360 degrees of bending, twisting. The traditional screen uses the material of substrate, and its hardness is composed of pixel dots distributed on the glass substrate. Flexible screen by flexible material instead of substrate material to achieve the effect of folding. At present, the main folding screen cell phone brands are Samsung, Huawei, Xiaomi, OPPO, Samsung and Huawei in the field of folding screen cell phone layout earlier, more models. From the perspective of technology research and development, cell phone folding screen plate material belongs to the high barrier high value volume link, in the research and development investment is technically difficult, folding cell phone plate main material is CPI material and ultra-thin glass (UTG), CPI application in folding cell phone translucency, thickness, hardness, repeat bending degree to be tested, easy to produce aging, poor sealing, low hardness, easy to scratch defects. UTG although hardness High, but fragile, Samsung cell phone companies in order to solve the problem, the use of CPI + UTG combination program, covered with a layer of CPI protective film on the UTG, increasing the hardness while reducing fragility. Due to the advantages and shortcomings of these two cover materials, manufacturers are generally based on composite structure materials, Samsung cell phone Galaxy Z Flip is the use of "ultra-thin glass + PET (or CPI)", Huawei mate Xs using double-layer CPI, double-layer structure of CPI to prevent water permeability and air permeability, to enhance the product's reliability.

In addition to the above market is relatively mature cell phone folding screen material, which, in stainless steel metal material and titanium material are used as cell phone folding screen success stories, Zhuolida etching process based in South China, set precision etching, electroplating, electrophoresis, anodic oxidation, precision electroforming, vacuum diffusion welding as a whole, able to folding screen thickness 0.03mm-2.0mm; tolerance can be controlled to a minimum of ± 0.01mm What is etching process? That is, photochemical etching, the process principle is to remove the protective film of the etched area after exposure and development through plate making, and make the metal contact with the chemical solution during the etching process, using two positive graphics to achieve the effect of dissolution corrosion through chemical grinding from both sides, forming the effect of concave and hollow molding. Etching process can be etched on almost all materials, the effectiveness of the product without scratching, burr-free and other advantages. Zhuolida etching process as a modern process advantages continue to highlight, for BYD, Huawei, Kyocera, Foxconn and other large brand companies to provide solutions.