Ultrasonic Welding Plastic

Ultrasonic welding of plastics material suitability guide.

Ultrasonic welding plastic.

It is frequently chosen when parts are too complex or expensive to be molded in one piece in ultrasonic plastic welding a vibratory motion at the horn face amplitude is transferred to the part. Ultrasonic welding uses high frequency vibration to melt and weld plastic. Ultrasonic welding is an industrial process whereby high frequency ultrasonic acoustic vibrations are locally applied to workpieces being held together under pressure to create a solid state weld it is commonly used for plastics and metals and especially for joining dissimilar materials in ultrasonic welding there are no connective bolts nails soldering materials or adhesives necessary to. Ultrasonic energy has been used to join thermoplastics for over 70 years.

It is accomplished by converting high frequency electrical energy into high frequency mechanical motion. That mechanical motion along with applied force creates frictional heat at the plastic. Welding of plastics using ultrasonics. Ultrasonic welders branson dukane models and tooling for plastics joining clam shell sealing staking insertion degating film sealing corrugated welding.

When combined with pressure friction produces heat melts the parts at the horn contact point. The process of ultrasonic welding of plastics is achieved by applying a vibrating metal tool horn at 90 to the stationery plastic parts which then vibrate. Once it stops hold pressure bonds and cools the weld joint. A tool vibrates at ultrasonic frequencies and causes concentrated molecular vibration in the weld joint.

An energy director is a raised region with a triangular cross section. Longitudinal vibrations in frequencies of 20 khz 30 khz and 35 khz with tool amplitudes between 5 µm and 50 µm are introduced into the plastic materials under the action of force. In ultrasonic welding it s important to focus the energy in as small a region as possible. The triangle tip is pressed against the mating plastic part and ultrasonic energy applied.

Ultrasonic plastic welding is the joining or reforming of thermoplastics through the use of heat generated from high frequency mechanical motion.