The dream of any steel cord producer is to get the highest
possible breaking load on his wire. However, the diffusion process, if the wire
is climbing a little bit too much in temperature, is contributing to its diminution
This risk was particularly present in the technologies of diffusion by Joule
effect and by induction.
Indeed, the principle of both these processes is to adjust
one current in order to get, as a consequence, a temperature of wire. This complex
regulation loop that is necessary for each wire in such type of process can
lead to “overshootings” in temperature and therefore to irreparable
losses in breaking load.
The principle of diffusion in fluidised bed is related to another
approach. The aim of it is to bring a medium (sand) to a temperature that, we
know, is not affecting the breaking load of the wire. So, the wires that circulate
in this medium can only in the worst cases have the same temperature as sand.
If this temperature is low enough, there will be no risk for the breaking load
of the wire to be deteriorated.
This system is offering a much simpler
regulation loop as the only thing to do is to keep the temperature of
the medium that is heating the wire (i.e. the temperature of sand).
Lastly, the threading-up easiness
of this furnace in line with the plating is not negligible compared to the system
with joule effect as the field does not undergo any inflexion.
Diffusion
fluidized bed
The dream of any steel cord producer is to get the highest
possible breaking load on his wire. However, the diffusion process, if the wire
is climbing a little bit too much in temperature, is contributing to its diminution
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