| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for embossing a resin film by which the resin film is smoothly stretched so that a molding surface is cleanly finished and a residual stress is eliminated and thereby, a postmolding shape is stabilized by internally generating heat due to ultrasonic vibration and the smooth release of a die after molding is achieved. SOLUTION: The resin film F is thermally softened at a temperature close to its melting point and the die 3a is pressed to the resin film F while the ultrasonic vibration is applied to the die 3a. After that, when the die 3a reaches a final pressing position, application of the ultrasonic vibration is stopped and the die 3a is kept at the final pressing position for a specified time. Following this step, the die 3a is released from the resin film while the ultrasonic vibration is applied to the die 3a.
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