Method and system for applying a sealing agent to the surface of an internal cavity of a pneumatic tire

A system for applying sealing agent to a surface of an inner cavity of a pneumatic tire, the system comprising:

• a sealing agent applicator device configured to apply a strip of sealing agent to the surface of the inner cavity while the pneumatic tire is brought into rotation around an axis thereof;
• a weighing station configured to measure a first weight of the pneumatic tire before the application of the sealing agent to the surface, and a second weight of the pneumatic tire after the application of the sealing agent to the surface;
• a control unit connected to the weighing station and further configured to:
• calculate a quantity of sealing agent applied to the surface from a difference between the measured second weight and the measured first weight;
• calculate a difference between the quantity of sealing agent applied to the surface and a reference quantity of sealing agent to be applied to the surface that varies as a function of a type of pneumatic tire;
• store said difference between the quantity of sealing agent applied to the surface and the reference quantity within a short-term memory buffer and a long-term memory buffer having a greater number of cells than the short-term memory buffer;
• determine a short-term compensation factor and a long-term compensation factor as a function of both the short-term memory buffer and the long-term memory buffer;
• calculate a correction factor selectively using the short-term compensation factor or the long-term compensation factor;
• and
• use said correction factor to actuate the applicator device during a subsequent iteration of applying the strip of sealing agent to the surface.