Appeal No. 1997-3029
Application 08/416,526
layers
in a package-filling machine. The sealing device must be
capable of being mechanically fixed in place within a housing,
machine or the like and therefore provided with a fixation
region which is typically located at the nodal plane of the
sealing device. In the case of rotationally symmetric sealing
devices that produce a small spot weld, since all points on
the periphery of the sealing device on any given plane behave
in substantially the same way, it is rather easy to provide a
mechanical fixation region at the nodal plane of the sealing
device while at the same time making the sealing device one-
half wavelength in length. The situation is different with
sealing devices that are adapted to produce a long and narrow
sealing joint. It was thought, prior to this invention, that
a sealing device for a long and narrow sealing joint must be
at least one full wavelength in length. The invention
comprises making a sealing device for a long and narrow
sealing joint of one-half wavelength in total length. The
reaction bodies and the fixation region are arranged
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