Plastic Bottle Base Structure for Carbonation Pressure Stability
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Solution Overview
Problem
Plastic beverage containers with champagne-style bases deform asymmetrically under carbonation pressure, leading to instability and tipping, and adding material to enhance strength increases weight and cost.
Innovation Solution
A base design featuring ribs and feet that distribute pressure uniformly, minimizing stress concentrations and preventing deformation, while maintaining a lightweight structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If material is added to enhance base strength, then load-bearing capacity is improved, but weight and cost increase
Solution Approach 1:
The base is segmented into multiple functional elements: a dome structure for pressure distribution, multiple feet (typically 3-5) for stable support, and ribs connecting the dome to the skirt. This segmentation allows each element to perform its specific function efficiently without requiring excessive material throughout the entire base structure.
Solution Approach 2:
Material distribution is optimized locally: the dome region has concentrated material to handle carbonation pressure, the feet have sufficient thickness for stability, and the connecting regions use ribs for structural transfer. This local quality approach ensures strength where needed while minimizing material in less critical areas, reducing overall weight and cost.
2Ease of manufacture
If base structure is simplified, then manufacturing cost is reduced, but structural stability deteriorates
Solution Approach 1:
The base is divided into distinct manufacturable segments (dome, feet, ribs, skirt) that can be formed using standard injection molding techniques. This segmentation allows for efficient manufacturing while maintaining the complex geometry needed for structural stability.
Solution Approach 2:
The dome features a curved, spherical geometry that is inherently stable and distributes stress evenly. This curved structure is well-suited for injection molding processes, requiring no complex tooling while providing superior structural performance compared to flat or angular designs.
3Strength
If feet are positioned closer to the center, then dome support is improved, but container stability on surface deteriorates
Solution Approach 1:
The feet are positioned asymmetrically relative to the dome center, typically forming a stable polygon (triangle, square, or pentagon) that is optimized for both dome support and surface stability. This asymmetric arrangement allows the feet to be slightly offset from the vertical centerline while maintaining overall balance.
Solution Approach 2:
The solution moves from a single-point support (center) to a distributed multi-point support system (feet arranged in a polygon). This dimensional change from 1D (vertical) to 2D (horizontal distribution) provides both dome support and surface stability simultaneously through geometric arrangement.
Data Source
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AI summary
A beverage container for a carbonated beverage may include a body and a base. The base may have a skirt that extends from the body and a dome. Ribs extend between the skirt and the dome. The base may also include a plurality of feet. Each foot may be formed between each pair of adjacent ribs. The feet may extend from the skirt to the dome. Each foot may have a seat and two sidewalls. A transition point of each rib may be between the skirt and the dome. A tangent line formed at each transition point may have a slope of zero. A transition between each foots seat and each foots sidewalls may be smooth.