| 摘要 |
<p>A hammer (14) coupled to an ultrasonic vibrator (15) is actuated to apply vibrations to a wrapping material (10) with irregularities in composition and thickness so that the wrapping material (10) can be fusion-bonded with uniform strength. The surface temperature of the wrapping material (10) measured by an infrared sensor (30) is sent to a control unit (22), and a controller (23) sends a control signal (24) to a variable-voltage source (25). The variable-voltage source (25) controls the amplitude of vibrations of the hammer (14) by temperature feedback to make uniform the generation of heat in the wrapping material (10).</p> |
