Method for manufacturing a ventilation zone in an aerosol-generating article

A method for manufacturing a first ventilation zone in a first aerosol-generating article and a second ventilation zone in a second aerosol-generating article, comprising the method steps:

• A) providing a first aerosol-generating article,
• B) forming first perforations in the first aerosol-generating article, thereby creating a first ventilation zone,
• C) determining the first air infusion value for the first aerosol-generating article, the air infusion value being determined by the equation (Pin−Pout)·100%/Pin, wherein Pin is an air pressure of between 5 millibars and 50 millibars applied at the first end face of the article and Pout is an air pressure detected at the second end face of the article,
• D) comparing said first air infusion value to a reference value,
• E) providing the second aerosol-generating article and forming second perforations in the second aerosol-generating article, thereby creating the second ventilation zone, wherein a size of the second perforations is adjusted based on the comparison between the determined first air infusion value and the reference value, wherein during method step C) an air blast is applied as air pressure to the first aerosol-generating article for a time period of between 25 milliseconds to 60 milliseconds and the pressure difference is measured between both opposing first and second end faces of the first aerosol-generating article as indicated by the equation above.