Effect of release agent on ultrasonic welding
The external release agent (zinc stearate, aluminum stearate, fluorocarbon, silicone) is usually sprayed onto the surface of the cavity to form a separate coating that facilitates removal of the part. The release agent may be transferred to the bonding surface, reducing the coefficient of friction of the material to be welded, affecting the heat generation of the bonding surface, hindering the fusion of the molten surface and forming a suitable connection. Silicone has the most harmful effects. The external release agent can sometimes be removed with a solvent. If an external release agent is necessary, the coatable, printable release agent is not transferred to the molded part, but the resin is prevented from wetting the mold surface. These levels of release agent have the least harmful effect on ultrasonic welding.
