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1. WO2000012289 - MOULD ASSEMBLY FOR FOOTED CONTAINER WITH RIBS BETWEEN THE FEET

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[ EN ]

WHAT IS CLAIMED IS:
1. 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; and
a 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 RQ;
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 RQC; said bottom portion further having a radius of maximum width RBASE;
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 Re that intersects an arc connecting inner points of contact of two adjacent support feet; and wherein
said radius of uniformity is within the range of about 16% to about 26% of

Roc; and Rc is within the range of about 70% to about 110% of RBASE.

2. A mold assembly according to claim 1, wherein:
said radius of curvature Rc defines an angle αIC with respect to said longitudinal axis;
said at least one rib has a localized radius of curvature RcG that intersects an outer boundary of said area of uniformity, said radius of curvature RCG defining an angle OQ with respect to said longitudinal axis; and
and αIC minus αG is within a range of about 16° to about 30°.

3. A mold assembly according to claim 1, wherein said radius of uniformity is within the range of about 18%o to about 24% of Roc- 4. A mold assembly according to claim 1, wherein Re is within the range of about 85% to about 100% of RBASE.

5. A mold assembly according to claim 2, αIC minus αG within a range of about 18° to about 22°.

6. A mold assembly according to claim 1, wherein RQC is at least about 70% ofRBASE.

7. A mold assembly according to claim 6, wherein RoC is within the range of about 72-75% of RBASE.

8. A mold assembly according to claim 1, wherein said rib has a varying radius throughout its length.
9. A mold assembly according to claim 1, wherein said bottom portion further has a dimension hoc that is defined as the height of the rib directly above the circle that is defined by said outer contact radius RQC, and wherein

Y[-Rbase-Smβ Roc
c = n-(l - Cosβ) (Λ - -RTΞΪe 1

where n= the number of feet in the bottom; and
A= a ring index, and wherein A is within a range of about 0.9 to about 1.15.

10. A mold assembly according to claim 9, wherein ring index A is within the range of about 0.95 to about 1.05.

11. 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; and
a second mold surface defining a bottom portion comprising:
a central pushup area;

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 RoC; and wherein
said bottom portion further has a dimension hoc that is defined as the height of the rib directly above the circle that is defined by said outer contact radius RQC, and wherein

TJ Rbase Smβ Roc
hoc = n (l - Cosβ) • ^ - Rb sΕ)

where n= the number of feet in the bottom, and
A= a ring index, and wherein A is within a range of about 0 9 to about 1 15

12 A mold assembly according to claim 11, wherein said bottom portion further comprises 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 and said radius of uniformity is within the range of about 16% to about 26% of RQC

13 A mold assembly according to claim 11, wherein said bottom portion further includes 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 Rc that intersects an arc connecting inner points of contact of two adjacent support feet, and wherein Re is within the range of about 70% to about 110% of RBASE