Abstract: In a first aspect, the invention relates to a roller core (2) with a tubular supporting wall (4) which extends conically widening (19). The roller core is adapted to receive an interchangeable roller sleeve (3) that can be stretched around it under air pressure. In particular, the roller core comprises an internal air distribution chamber (17) which is limited annularly by an internal surface of the supporting wall, and which is limited via an internal wall portion (27, 27?) to a smaller partial volume of the internal roller volume. In further aspects, the invention relates to an applicator roller (1), a method for mounting and dismounting roller sleeves, and a method for manufacturing roller cores.