6
front AND the bulb behind the heating area. This
ensures that the bulbs in front and behind do not
continue to heat the area that has already reached
cure temperature.
This mode is best used when the belt is running
very slow, and ensures a minimum amount of
temperature overshoot on the product. However,
it also reduces the overall speed of cure, since
more bulbs are off for longer periods of time
than in other control modes.
Bulb 4
Heating
Area
Bulb 3
Heating
Area
Bulb 2
Heating
Area
Bulb 1
Heating
Area
Cure Temp
Achieved
Adjacent
Heating Areas
Figure 10: Bulb Heating Areas
twoBulb:
This mode works similarly to tripleBulb, but it
turns off only the bulb in question and the bulb
in front – not the bulb behind the area at temp.
This mode is best used when product is running
at medium speeds, and it is desirable to reduce
temperature overshoots.
leadingBulb:
In this mode, when the product has reached cure
temperature in a bulb’s heating area (Figure 10),
the next bulb in line is turned off until the
product drops back down below cure temp. The
bulb above the heating area in question is not
turned off.
This mode is best used when product is running
at high speed, where bulbs must be controlled in
anticipation of product arriving, rather than
reacting to product already in their heating area.
