Variable Displacement Container Base for Hot-Fill Deformation Control
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Solution Overview
Problem
Plastic containers used for hot-filled liquids face deformation issues due to thermal and pressure variations during the hot filling and cooling processes, which can lead to non-functional or visually unappealing containers, and existing vacuum panel technologies are not aesthetically appealing and restrict shape and weight optimization.
Innovation Solution
A container base design featuring a diaphragm structure with radiused portions and ribs that allows controlled deformation under pressure differentials, accommodating both positive and negative pressures, and maintaining container integrity during cooling, while being lightweight and visually appealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vacuum panel is added to the container base to control deformation, then the container maintains shape and functionality under pressure, but the container weight increases and the base area is restricted
Solution Approach 1:
The base is designed with non-uniform thickness distribution, having a thickest portion at the center and progressively thinner portions toward the periphery. This local variation in material distribution provides enhanced structural support where needed (center) while reducing material usage where less support is required (periphery), thereby maintaining container shape without unnecessarily increasing overall weight.
Solution Approach 2:
The base incorporates curved surfaces and radiused portions instead of flat geometries. The curved configuration allows for more efficient stress distribution across the base structure during pressure changes, improving shape maintenance while using material more effectively. The curvature enables the base to flex and deform in a controlled manner under pressure differentials.
2Weight of moving object
If the base material thickness is reduced to make the container lighter, then the container weight decreases, but the base cannot withstand pressure differentials effectively
Solution Approach 1:
The base employs variable thickness design with the thickest material concentrated at the center portion and progressively thinner material toward the edges. This local quality variation ensures that maximum material strength is deployed where pressure differentials are most critical (center), while minimizing material usage in peripheral areas, thus achieving lightweight construction without compromising pressure resistance.
Solution Approach 2:
The base is divided into multiple functional zones with different thickness characteristics: a central thick portion for pressure resistance, intermediate transition zones, and peripheral thinner portions. This segmentation allows each zone to be optimized for its specific functional requirements, balancing weight reduction with pressure withstand capability.
3Strength
If the base area is increased to provide better pressure distribution, then the container can withstand pressure differentials better, but the container shape and surface geometry are restricted
Solution Approach 1:
The base provides concentrated structural support at the center with maximum thickness, while allowing the periphery to be thinner and more flexible. This local quality variation enables the base to effectively distribute pressure through the central region without requiring a uniformly large base area, thereby preserving container shape freedom and aesthetic design options.
Solution Approach 2:
The curved and radiused geometry of the base allows for efficient pressure distribution through geometric shape rather than increased area. The curvature enables the base to redirect and distribute forces more effectively, maintaining shape integrity without requiring a larger flat base area that would constrain container design flexibility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The base design provides uniform and controlled deformation, maintaining container shape and functionality under varying pressures and temperatures, enhancing the container's aesthetic appeal and reducing material usage while maintaining performance.
Implementation Method 1
the base can be used to provide controlled deformation from positive and/or negative internal pressures
Implementation Method 2
the base includes a diaphragm structure with radiused portions and ribs that allows controlled deformation under pressure differentials
Implementation Method 3
the container is subjected to different thermal and pressure scenarios that can cause deformation during the hot filling and cooling processes
Implementation Method 4
the container is subjected to different thermal and pressure scenarios that can cause deformation during the hot filling and cooling processes
Data Source
AI summary
Base includes an outer support wall, a support surface extending inwardly from the outer support wall and defining a reference plane, an inner support wall extending upwardly from the support surface, a first radiused portion extending radially inward from the inner support wall and concave relative to the reference plane, a second radiused portion extending radially inward from the first radiused portion and convex relative to the reference plane, an intermediate surface extending radially inward from the second radiused portion, the intermediate surface including a linear portion and an intermediate radiused portion, a third radiused portion extending radially inward from the intermediate surface and convex relative to the reference plane, and a central portion disposed proximate the third radiused portion.