A pressing apparatus for producing a food service paperboard container
from a paperboard blank so that the paperboard container possesses an
overturned rim provided with folds includes a first die and a second die
that are movable relative to one another. The first die includes a first
base and a first platform that is movable with respect to the first base,
with the first base having a curved surface for engaging the outer
periphery of the paperboard blank. The second die is positioned in
opposing relation to the first die and includes a second base and a
second platform that is movable with respect to the second base. The
second die is movable with respect to the first die and the second base
has a curved surface for engaging the outer periphery of the paperboard
blank so that the outer periphery of the paperboard blank is pressed
between the curved surface of the first base and the curved surface of
the second base. A first cast-in heater is mounted within a recess in the
first die and includes a resistor wire embedded within a thermally
conductive cast-in material. A second cast-in heater is mounted within a
recess in the second die and includes a resistor wire embedded within a
thermally conductive cast-in material.
