Heating sheet, heating tube, and electric appliance

A heating tube, comprising:

• a heating sheet comprising a graphite sheet substrate, the graphite sheet substrate comprising:
• a buffer region located at first and the second end of the graphite sheet substrate;
• and
• a heating region connected to the buffer region and located on a side of the buffer region facing away from the first and second end, wherein the heating region comprises a hollow zone, and wherein a duty ratio of the buffer region is greater than a duty ratio of the heating region;
• an outer tube, the heating sheet being disposed in the outer tube;
• a lead wire;
• and
• a connection terminal,
• wherein the heating sheet is connected to the connection terminal by the lead wire.

An electric appliance, comprising a heating tube, the heating tub comprising:

• a heating sheet comprising a graphite sheet substrate, the graphite sheet substrate comprising:
• a buffer region located at a first and a second end of the graphite sheet substrate;
• and
• a heating region connected to the buffer region and located on a side of the buffer region facing away from a first end and a second end, wherein the heating region comprises a hollow zone, and wherein a duty ratio of the buffer region is greater than a duty ratio of the heating region;
• an outer tube, the heating sheet being disposed in the outer tube;
• a lead wire;
• and
• a connection terminal,
• wherein the heating sheet is connected to the connection terminal by the lead wire.