| 摘要 |
<p>An ultrasonic horn (H) and anvil block (B) for ultrasonic heatsealing equipment in which the horn has a tip each of whose opposite ends are upwardly inclined relative to a central part of the horn tip so that when the horn is brought into cooperation with a counterpart anvil a gap set between the horn tip and the juxtaposed face of the anvil gradually diminishes from each of said ends towards said central part of the horn tip and in which the anvil has on said juxtaposed face a series of spaced substantially hemispherical projections (18).</p> |
