mold base for manufacturing containers of thermoplastic mold and molding device provided with at least one mold crew of such a background

Bottom (1) of a mold for blow molding or stretch-blow molding containers (2) thermoplastic petaloid bottom; the bottom (1) of the mold comprises several cavities (11) separated by ridges (13) radiating to-peak (14) extended concave, the bottoms (15) of the cavities (11) being distributed on a circular contour; each cavity (11), radially on treated side of its deepest point is defined outwardly by a surface portion (18) radial cross-section curved in an arc and inward by a surface portion (19) in broken plane to at least two slopes intersecting the surface portion (18) curved according to a ridge (20) right, the plane (T) containing the edge (20) and tangential to the portion of surface (18) curved, being perpendicular to the axis (12) of the mold base and the plane portion (21) adjacent the surface portion (18) curve having a slope (alpha) between 12 degree and 8 degree relative to the tangent plane (T).