Patent ID: 6296471
Filing Date: 2001-10-02
Classification: B29C,B65D

Abstract:
A mold assembly for making a polymeric container that is shaped to exhibit superior characteristics of light weighting, stability against toppling and resistance to stress cracking, comprising:a first mold surface defining a substantially cylindrical body portion having a longitudinal axis and a circumferential sidewall; anda second mold surface defining a bottom portion comprising:a central pushup area of uniformity that is substantially uniform within a spatial rotation about the longitudinal axis, said area of uniformity having a radius R.sub.G ;a plurality of support feet surrounding and protruding downwardly from the pushup area, each of the support feet having a bottom support surface with an inner point of contact and an outer point of contact, said outer points of contacting together defining an outer contact radius R.sub.OC ; said bottom portion further having a radius of maximum width R.sub.BASE ;a plurality of ribs positioned in said valleys between said support feet, each of the ribs being positioned between and helping to define two of the support feet, at least one of said ribs having a localized radius of curvature R.sub.C that intersects an arc connecting inner points of contact of two adjacent support feet; and whereinsaid radius of uniformity is within the range of about 16% to about 26% of R.sub.OC ; and R.sub.C is within the range of about 70% to about 110% of R.sub.BASE.