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Process for improving material thickness distribution within a molded bottle and a bottle therefrom

Imported: 24 Feb '17 | Published: 06 Jan '04

Michael P. Wurster, Kevin D. Gaydosh, Christopher C. LaBombarbe

USPTO - Utility Patents

Abstract

A process and a bottle made from this process where the bottle has improved material thickness distribution within the bottom or base portion. The bottle has a noncircular cross-sectional configuration with corresponding major and minor axes. The mold-base region of the bottle mold-cavity features at least one standing rib-like projection generally parallel to the major axis. The standing rib-like projection increases surface distance in a direction generally corresponding with the minor axis. An expanding heated preform traverses the increased surface distance causing the preform to thin more than what otherwise would be the case thus improving material thickness distribution of the base portion that in turn minimizes unwanted bottle shape distortions.

Description

DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front elevational view of a bottle;

FIG. 2 is a side elevational view of the bottle shown in FIG. 1;

FIG. 3 is a bottom view of the bottle in FIG.

1 and FIG. 2;

FIG. 4 is a bottom view of a prior art bottle;

FIG. 5 is an enlarged partial cross-sectional view along line

5

5 of the bottom shown in FIG. 4;

FIG. 6 is an enlarged partial front elevational view of the bottom shown in FIG. 4;

FIG. 7 is an enlarged partial cross-sectional view along line

7

7 of the bottom shown in FIG. 3;

FIG. 8 is a bottom view of an alternative embodiment of the invention;

FIG. 9 is an enlarged partial cross-sectional view along line

9

9 of the bottom shown in FIG. 8;

FIG. 10 is a side view of a preform; and

FIG. 11 is a bottom view of the preform shown in FIG.

10.

Claims

1. A base portion of a blow-molded polyester bottle, said base portion merging with a bottle sidewall and said bottle sidewall merging with an open end, said base portion comprising:

2. A base portion of a blow-molded polyester bottle, said base portion merging with a bottle sidewall and said bottle sidewall merging with an open end, said base portion comprising:

3. A base portion of a blow-molded polyester bottle according to claim 2 wherein said base portion includes two ribs.

4. A base portion of a blow-molded polyester bottle according to claim 3 wherein said two ribs are generally parallel to one another and separated by said major axis.

5. A base portion of a blow-molded polyester bottle according to claim 2 wherein said rib begins on one half of said base portion and terminates on an opposing half of said base portion.

6. A base portion of a blow-molded polyester bottle according to claim 5 wherein said rib is uninterrupted.

7. A base portion of a blow-molded polyester bottle according to claim 2 wherein said rib extends across said minor axis.

8. A base portion of a blow-molded polyester bottle according to claim 2 wherein said cross-sectional shape is one of a generally rectangular or generally oval cross-sectional shape.

9. A base portion of a blow-molded polyester bottle, said base portion merging with a bottle sidewall and said bottle sidewall merging with an open end, said base portion comprising:

10. A base portion of a blow-molded polyester bottle according to claim 9 wherein said base portion includes two upstanding ribs located generally parallel to one another and separated by said major axis.

11. A base portion of a blow-molded polyester bottle according to claim 9 wherein said cross-sectional shape is one of a generally rectangular or generally oval cross-sectional shape.

12. A base portion of a blow-molded polyester bottle, said base portion merging with a bottle sidewall and said bottle sidewall merging with an open end, said base portion comprising:

13. A base portion of a blow-molded polyester bottle according to claim 12 wherein said boundary is defined by a wall thickness being between about 25 and 40 percent of the thickness of said thickest portion.

14. A base portion of a blow-molded polyester bottle according to claim 12 wherein said boundary is defined by a wall thickness being no less than about 25 percent of the thickness of said thickest portion.

15. A base portion of a blow-molded polyester bottle, said base portion merging with a bottle sidewall and said bottle sidewall merging with an open end, said base portion comprising:

16. A base portion of a blow-molded polyester bottle according to claim 15 wherein said front portion and said back portion are oriented generally in the direction of said major axis and transverse to said minor axis.

17. A base portion of a blow-molded polyester bottle according to claim 15 wherein said rib extends across said minor axis, a first end beginning on one half of said base portion and a second end terminating on an opposing half of said base portion.