Temperature control unit for injecting molding
teco vario
gwk
a hot melt hits cooler cavity walls. This
causes a thin material layer to "freeze",
thereby creating a thermal insulation, while
the inner material of the injected part has
to be cooled down to be stable enough to
be ejected. This process has got a double
impact. For one, due to the poor heat conductivity,
for parts with increasing wall thickness
the cooling time becomes the commanding
factor of the total cycle time. For
two the high demands placed on distortion,
dimensional accuracy and, above all surface
quality, have to be compensated for
with an even higher cavity temperature
which leads to a further increase in cycle
time. Highly affected are all parts with high
gloss surfaces and thick walled optical lenses
with high quality demands, which cannot be
produced economically in large quantities
with current manufacturing processes. A solution
to this problem is the latest process
with variothermic mould heating and dynamic
cavity temperature control, which operates
the heating and cooling intervals in
accordance with the cycle times.
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