Patent ID: 8272863

Claim:
A mold base for a mold for producing, by blowing or stretch-blowing, containers, from preforms made of a thermoplastic material, in which said containers have a body and a container base including a peripheral seat, in the shape of a crown, internally connected to a central area forming a vault consisting of a plurality of radiating imprints alternating with a plurality of radiating projections, which are angularly distributed equidistantly around a central axis of said container base, wherein said mold base includes, for molding said central area of said container base, a plurality of radiating projecting branches that are angularly equidistantly distributed, and extending substantially radially to the axis of the mold base; a central trunk having a lateral wall to which said branches are connected; intervals forming portions of angular sectors regularly separating said branches from one another, wherein each said radiating projecting branch has an upper portion in the form of an inclined plate sloping downwardly from the center toward the periphery with at least two points of inflection of the curvature, owing to which, during the blowing or stretch-blowing, the blown material from the base of the blown preform can flow more easily over said upper portion of said branch, thereby enabling spreading and downward flowing movement of the amorphous material from the base of the blown preform to be improved.