Aerosol-generating article material end detection by detection of difference between bobbin core and wound material

A system for supplying a continuous material for aerosol-generating articles, the system comprising:

• a bobbin holder configured to receive a supply bobbin comprising a bobbin core and a continuous material wound around the bobbin core, such that the supply bobbin is rotatable about a rotation axis for unwinding the continuous material;
• and
• a bobbin exhaustion sensor configured to monitor a monitoring region through which a circumferential surface of the supply bobbin passes, when the supply bobbin is rotated about the rotation axis,
• wherein the bobbin exhaustion sensor is configured to determine whether a portion of the circumferential surface of the supply bobbin located in the monitoring region is formed by the continuous material or by the bobbin core.

A method of supplying a continuous material for aerosol-generating articles to a processing location, the method comprising:

• unwinding a continuous material from a supply bobbin, wherein the supply bobbin comprises a bobbin core and the continuous material wound around the bobbin core;
• conveying the unwound continuous material to a processing location;
• and
• detecting exhaustion of the supply bobbin by detecting a difference between a surface of the continuous material and a circumferential surface of the bobbin core.