Do not assume the arrangement is suitable. A dryer is a high-load appliance, and shared or unsuitable extension equipment can overheat.
Understanding this situation
The manufacturer specifies the supply requirements. A reel that physically accepts several plugs does not establish safe capacity, and partially wound or damaged equipment introduces further concerns.
A useful next step
Use an appropriate installation and seek qualified electrical advice where necessary. Stop using hot, loose or discoloured connections. Do not bypass protection or treat alternating appliance use as a repair for an already damaged extension arrangement.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.