At present, with the development of thin and light mobile phones, when the internal components of the phone are raised or the surface of the components is uneven after assembly, they come into close contact with the inner explosion-proof film, which can cause deformation of the inner explosion-proof film. This deformation can easily form a "top white" mark on the back cover of the phone, which we call "top printing". The phenomenon of top printing not only causes defects in the aesthetics of mobile phones, but also affects the mechanical properties of explosion-proof films due to long-term forces.
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The development of lightweight handheld devices has led to a tight arrangement of internal components, which can cause friction and produce noise when the phone rings or vibrates. In addition, if the speaker design is not reasonable, it can also interfere with the sound cavity, causing an increase in amplitude, resonance, and noise formation.
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