
The distribution of heat, how long it is applied, and pressure on the seal greatly affects how well the seal performs. In our case, we produce a frangible seal. This is a special type of seal designed to break open at just the right pressure, and requires very precise pressure and temperature.
Various industries are trying to make tools to measure sealing performance and sealing tool quality. Here is such a tool: It produces a color-coded map of pressure, which could be useful. One thing that is shown here is an acoustic horn, which is part of the business end of an ultrasonic welder. Instead of just being hot, ultrasound waves are transmitted into the material to heat it up by just the right amount.