Patent ID: 7128807

Claim:
Device for the fluid-tight sealing and separation of a pipe section ( 10 , 16 , 18 ) by means of an ultrasonic welding device, comprising: a sonotrode ( 20 ) with two spaced first welding surfaces ( 22 , 24 ), a counter-electrode or an anvil ( 21 ) with two second welding surfaces ( 42 , 44 ) assigned to the two first welding surfaces, a separating element ( 26 ) extending from the sonotrode between the two first welding surfaces, a notch ( 46 ) between the two second welding surfaces of the counter-electrode which is assigned to said separating element ( 26 ), said notch having an opening with a first cross-sectional area; said notch having a bottom area with a second cross-sectional area; wherein the first cross-sectional area of the opening of the notch is less than the second cross-sectional area of the bottom area of the notch.