Sealing method

摘要

The invention provides a method of improving the gastightness of a seal formed between two components consisting of a closure cap applied to seal a container. An ultrasonically vibrating horn is applied to the closure cap to heat the sealing surfaces of the closure cap and container. As the cap and/or container are formed of thermoplastic material, the ultrasonic heating softens the sealing surface of one of the components and causes it to mould into close conformity with the complementary sealing surface of the other component with the effect that the gastightness of the seal between the two is improved. The application of ultrasonic heating energy is discontinued before any significant welding between the two components can occur.