Anvil for an ultrasound sealing unit

摘要

Anvil for an ultrasonic sealing unit for sealing at least two sections composed of a plastic coated support material; wherein the ultrasonic sealing unit comprises a sonotrode movable relative to the anvil. The anvil has an anvil body with a sealing surface at a front of the body. The sealing surface has raised and indented areas where the raised areas are configured as narrow ribs. One of the ribs is a lower retaining rib running along a free lower edge of the sealing surface. Another of the ribs is a central sealing rib, above and parallel to the lower retaining rib, which central sealing rib extends across the entire width of the sealing surface.