The present invention refers to an apparatus and a method for forming a
packaging unit consisting of an endless hose, or for sealing a
prefabricated packaging unit, comprising an ultrasonic welding device
including an anvil and a sonotrode, which are movable towards each other,
and a means for positioning the hose material to be welded between the
anvil and the sonotrode. In accordance with the present invention it is
suggested that the anvil comprises two anvil parts which are movable
relative to one another in the direction of the sonotrode, one of said
anvil parts being implemented as a sealing anvil and the other part being
implemented as a separating anvil. Hence, the apparatus according to the
present invention permits the production of packaging units which end
directly at the weld, i.e. in the case of which no length section of the
foil material projects outwardly beyond the weld. The method according to
the present invention is characterized in that the material of the endless
hose or of the packaging unit projecting beyond the weld is cut off
directly adjacent to or in said weld.
