Ultrasonic Sealing - A film
sealing method in which sealing is accomplished through
the application of vibratory mechanical pressure at
ultrasonic frequencies (20 to 40 KC.). Electrical energy
is converted to ultrasonic vibrations through the use
of either a magnetostrictive or piezoelectric transducer.
The vibratory pressures at the film interface in the
sealing area develop localized heat losses which melt
the plastic surfaces effecting the seal.
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