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The rate of heat transferred is
greater than with resistance heaters, from the moment of switch on the whole mass (platen
or tool) is being heated, as opposed to resistance heaters, (tubular or strip) where the
heater has to reach very high temperatures before it can transfer its heat to the main
body.
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Very little heat is generated in
the coils, in fact the coils are only slightly hotter than the whole mass being heated.
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By proper proportioning of the
primary circuit, (coils), heat can be generated uniformly throughout the platen or tool
giving a very good heat profile throughout the mass.
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Rapid heating is possible
because the energy supply can be several times that necessary to balance the losses, and
this loading can be installed without detrimental effects on temperature control.
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Because the coils never reach
very high temperatures, unlike resistance heaters their working life is infinitely
greater.
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Platens can be made any size
from 5 inches square (10.5cm) to 10 feet by 7 feet (3.0m x 2.0m), from 25 pounds (12kg)
weight to above 5 tons (5000kg).
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We are experts at providing heat for
moulding within a vacuum or contaminated atmosphere. Tubular or strip heaters moulding
within a vacuum will become incandescent when the vacuum is released and the red hot
heaters are exposed to the atmosphere, as an electric lamp when the glass envelope is
punctured. |
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Quality
accreditation to BS-EN ISO9001:2008 |
