Drawing-blowing method and device for molding thermoplastic material containers, in particular bottles, with petaloid bottoms

摘要

The invention relates to manufacturing thermoplastic material containers (2) with a petaloid bottom (4) by drawing-blowing hot preforms (16) in a blowing mold that has a petaloid mold bottom (1) including radiating ridges (13) alternating with cavities (11) that are adapted to form the valleys (7) and the feet (5), respectively, of the container bottom; during drawing, heat losses are reduced in longitudinal zones (19) of the end part (20) of the preforms, extending over the bottom (18) and over an axial portion of their body (21), distributed over the periphery of the ends of the preforms facing respective cavities (11) of the mold bottom (1).