the invention relates to manufacturing thermoplastic material containers with a petaloid bottom by drawing - blowing hot preforms in a blowing mold that has a petaloid mold bottom including radiating ridges alternating with cavities that are adapted to form the valleys and the feet , respectively , of the container bottom ; during drawing , heat losses are reduced in longitudinal zones of the end part of the preforms , extending over the bottom and over an axial portion of their body , distributed over the periphery of the ends of the preforms facing respective cavities of the mold bottom .