Reflectors direct radiant energy toward the sheet and limit heat loss into the oven structure. Dust, fumes, oil mist, oxidation, peeling coatings, or mechanical distortion can reduce and redirect that energy while the element’s electrical power remains normal.
A zone with normal current but weak sheet heating should be inspected for reflector condition, spacing, and alignment. The thermal pattern may show a broad loss rather than the sharp cold band of a failed element. Comparing cleaned and unchanged zones under the same operating condition helps confirm the effect.
Reflectors should be cleaned only with methods approved for their material and coating. Abrasive polishing can permanently alter reflectivity. Sources of vapor or oil contamination should be corrected, and damaged reflectors replaced rather than hidden with higher power settings.