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As a mobile phone accessory with both practicality and portability, the mobile phone airbag bracket relies on high-quality injection mold technology for its precise structure. The airbag bracket produced using PC+TPE two-color molds can not only ensure structural stability by virtue of the high strength of PC material, but also improve the holding feel through the soft characteristics of TPE, thus becoming a mainstream choice in the market.
The production cycle of such two-color molds is usually 45-60 days, which can be specifically divided into three stages. The design stage (7-10 days) needs to combine the folding function and stress characteristics of the airbag bracket, complete the structural design of the cavity and core using 3D modeling software, and at the same time plan the injection paths of PC and TPE materials to avoid weld marks or bubbles. The processing stage (25-35 days) is the core of the cycle. It is necessary to ensure that the tolerance of the mold cavity is controlled within ±0.01mm through CNC precision machining. Especially for the arc structure at the folding part of the airbag, EDM (Electrical Discharge Machining) must be adopted to ensure the smoothness of the curved surface. The mold testing and adjustment stage (10-15 days) verifies the mold tightness through multiple trial injections, tests the coating effect of TPE materials, and ensures that there is no risk of cracking or falling off at the joint of the two materials.
The key technologies in the production process are reflected in three aspects. Firstly, the timing control of two-color injection requires accurate setting of the injection pressure (80-100bar and 40-60bar respectively) and temperature (280-300℃ for PC and 180-200℃ for TPE) of the PC base material and TPE coating layer to avoid differences in material shrinkage caused by temperature differences. Secondly, the design of the mold exhaust system. Since there are small air channel structures inside the airbag bracket, it is necessary to set 0.01-0.02mm exhaust grooves at the end of the cavity to prevent material shortage caused by gas residue. Thirdly, the optimization of the demolding mechanism. A combined demolding method of inclined top and thimble is adopted to ensure that the soft part of TPE does not deform during demolding.
For users, the use of the air bag cell phone bracket follows simple steps: first, attach the bracket base to the back of the mobile phone, press the airbag body to inflate and expand it, adjust the support angle according to the usage scenario (such as 60° for watching movies, 30° for video calls), and press the exhaust valve to release the gas for storage after use. Behind this convenience is the precise control of product structure and material characteristics by two-color mold technology, which not only realizes functional integration but also takes into account the user experience.
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