Patent ID: 6458228
Filing Date: 2002-10-01
Classification: B29C

Abstract:
A method for controlling fusion-bonding temperature of a wrapping material, comprising the steps of:in ultrasonic sealing means comprising a wrapping material (10) and a sealing hammer (14) that are in relative motion, an ultrasonic vibrator (15) which actuates the sealing hammer (14) and applies an impact to the wrapping material (10) via said sealing hammer (14), and an electric circuit (20) for applying oscillating power to said ultrasonic vibrator (15), measuring by a non-contact-type temperature sensor (30), in the vicinity of said sealing hammer (14), the fusion-bonding temperature of the wrapping material (10) which is heated by continuous impacts of the sealing hammer (14); sending, to a variable-voltage device (25) for a power source (26) for said electric circuit (20), output signals (24) corresponding to measured temperatures being successively inputted to a control unit (22) from the temperature sensor (30); and controlling, with said variable-voltage device (25), an amplitude of said moveable hammer (14) in accordance with said measured temperature value, so as to make uniform the heating temperature of the wrapping material (10).