Plastic Container Base Footed Design for Creasing Resistance
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Solution Overview
Problem
Conventional petaloid base designs for plastic containers fail to withstand extreme pressures, such as those from carbonated beverages, due to creasing issues and lack of stability, especially when manufactured at high speeds.
Innovation Solution
A plastic container base design featuring a smooth, balanced geometry with radially spaced feet, straps, and fillet areas, providing a cumulative strap surface area to cumulative foot surface area ratio of 2.4-2.8:1, which distributes internal pressure and enhances stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional petaloid base designs are used, then manufacturing simplicity is maintained, but resistance to breakage and creasing under extreme pressure is insufficient
Solution Approach 1:
The base is segmented into multiple functional elements: feet, straps, and fillet areas. The feet provide structural support and pressure distribution, the straps connect the feet to form a integrated structure that resists deformation, and the fillet areas reinforce critical junction points. This segmentation allows each element to perform its specific function in resisting breakage and creasing under extreme pressure.
Solution Approach 2:
The base incorporates curved and rounded geometries rather than sharp angles. The feet have rounded contact surfaces that distribute pressure evenly, and the fillet areas use curved transitions between straps and feet to eliminate stress concentration points. This curvature approach enhances strength by avoiding sharp corners where cracks would initiate.
2Weight of moving object
If lighter weight containers are manufactured, then weight reduction is achieved, but stability and resistance to creasing deteriorate
Solution Approach 1:
The base structure implements local quality by concentrating material and structural complexity only where needed for strength. The feet, straps, and fillet areas are strategically positioned at critical load-bearing locations, while the container wall remains thin and lightweight. This localized reinforcement provides maximum stability and creasing resistance with minimal additional weight.
Solution Approach 2:
The base structure functions as a composite system combining multiple geometric elements (feet, straps, fillets) that work together to provide enhanced mechanical properties. The interconnected structure creates a composite effect where the whole is stronger than the sum of individual parts, achieving high stability and creasing resistance while maintaining lightweight construction.
3Productivity
If high-speed manufacturing is implemented, then productivity increases, but base performance under extreme pressure deteriorates
Solution Approach 1:
The base geometry is designed with preliminary action by incorporating all necessary structural features (feet, straps, fillet areas) directly into the molding process. The complex geometry is built-in during high-speed injection molding, eliminating the need for post-manufacturing assembly or reinforcement steps. This ensures consistent structural integrity is achieved every cycle at high production speeds.
Solution Approach 2:
The invention optimizes geometric parameters of the base structure, specifically the ratio of cumulative strap surface area to cumulative foot surface area (2.4-2.8:1), to achieve maximum performance. These parameter optimizations ensure reliable pressure distribution and creasing resistance while maintaining compatibility with high-speed manufacturing processes.
Data Source
AI summary
A one-piece plastic container including a base portion. A gate area is at an axial center of the base portion. A plurality of feet are radially spaced apart about the axial center. Each strap of a plurality of straps is arranged between neighboring feet. Each one of a plurality of fillet areas is arranged between one of the plurality of feet and straps on opposite sides thereof. A cumulative strap surface area is defined by a total surface area of the plurality of straps, the gate area, and half a total surface area of the plurality of fillet areas. A cumulative foot surface area defined by a total surface area of the plurality of feet and half the total surface area of the plurality of fillet areas. The base portion has a ratio of cumulative foot surface area to cumulative strap surface area in the range of 2.4-2.8:1.