is converted into mechanical ultrasonic vibrations in an electromechanical
converter. By using a sonotrode as a sealing tool, the
vibrations are introduced under the effect of force into the components
to be joined. The process thus generates the sealing heat
from inside the packaging material. Strong bonded joints, as well
as peelable bonded joints with individual sealed seam geometries
if required, can be produced with this method without exposing
either the product or its environment to high thermal stress. There
are no warm-up times and the sonotrode remains practically cold.
Heat does not alter the filler material, which is particularly relevant
for groceries. In addition, the barrier properties of the packaging
are not impaired.
However, the sealed weld is not only tight, but also reduces
the amount of packaging material required due to the narrow
sealing zone. In the case of salad packaging, for example, which
is produced using the tubular bag method, this can save around
50% of the material between the bags. The ultrasonic vibration
also cleans the sealing area of possible impurities, while any residual
product is reliably forced out of the seam. Even sealing
through liquids is no problem. Here, another advantage comes
into play: ultrasonics can also be used for cutting, which means
that stamping and sealing are possible in a single work step.
Energy-efficient, food-compliant and
The short sealing times and high level of efficiency also distinguish
ultrasonic technology as an energy-efficient joining method,
which not only allows the sides or bottom seams (Fig. 2) of filled
beverage packages to be sealed tightly and reliably, but also the
practical quick pour spouts (Fig. 3) to be joined securely. The sonotrodes
used here are made of a food-compliant, FDA-certified
titanium alloy and are available in a wide variety of versions (Fig.
4). If necessary, a quick tool change is possible. The sonotrodes require
little maintenance; maintenance intervals can be optimized
and service costs reduced.
Fig. 1: Beverage, sauce and paste cartons can be sealed reliably
and economically with ultrasonic technology. (Telsonic)
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