The traditional flanging technique is replaced by deep-drawn undercut. The work stage dispensed with as a result leads to a cost saving and shorter production time. What is more, compared with the conventional solution, this blister is sparing with resources and can be further processed by machine. The edge, which runs all the way around, gives the blister great robustness, which allows the film thickness to be reduced. Another advantage is better process precision i.e. the carton and the product can be precisely centred. In addition, unlike with the seal blister, the carton and the plastic part may be disposed of separately.