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Mobile phone holster, die 1 product requirements: determine the service life of the mold, the wear rate, and therefore decided to adopt what kind of metal. 2, the shape of the product: the use of the welding process, set the size of the mold, the pressure of the area, the product in the fusion may produce the deformation, the need for the power and what function. If you can finish the work in time. 3, the product of plastics properties: the decisions of the amplitude of mould, that a work should be accepted ultrasonic energy, the guide line, location, and size. How to design contact with different plastic combinations?