A laser processing method includes: marking multiple concaves on a surface of a preform before blow molding.

A method for producing containers from preforms. In example embodiments, the containers can have different formats. In example embodiments, the method includes thermal conditioning of a preform made of a thermoplastic material, moulding by blow-moulding or stretch blow-moulding of the container by means of a unit for forming containers, and calibration. The calibration includes providing a sample preform for said format; placing, on said sample, at least two reference markers distributed along the height of said sample; thermally conditioning the sample and blow-moulding the sample in order to obtain a container according to said format; reading off the position of the reference markers on said container obtained; and assigning each of the heating means to at least one of the three portions on the basis of the position of the reference markers on said container obtained. The invention also relates to a facility implementing the production method.