Patent ID: 7891968

Claim:
A mold base for a mold for the manufacture, by blow-molding or stretch-blow-molding, of containers, particularly of bottles, made of a thermoplastic such as PET, said containers having a body and having a base of the type said petalloid with five feet which are distributed angularly with uniform spacing, which run approximately parallel to the axis of the container and which are separated from one another by radiating valleys the bottoms of which run radially with a convex curvature, which base of the container connects with the body of the container in a connection region that is substantially a cylinder of revolution having a diameter Φ of about 85 to 95 mm, said mold base comprising, for molding said base of the containers, five cavities which are distributed angularly at even distances apart, run approximately parallel to the axis of the mold base and are separated from one another by radiating dorsal fins the crests of which are radially concave, the bottoms of said cavities being distributed over a substantially circular contour with a basic diameter D ranging between about 60 and 66 mm, wherein in combination: the base of each cavity, adapted for forming a bearing surface of a foot of the container, has a width l, measured parallel to the periphery, of between about 1.5 and 3.5 mm; each dorsal fin has a dorsal fin crest radius r of between about 2 and 5 mm; each dorsal fin has flanks which are concave in an approximately axial direction and of which the planes tangential to the origin form an angle a of between about 52° and 88°; and the height H of the dorsal fin ranges between about 16.5 and 18 mm.