Vacuum Panel Container Outboard Sidewall Design
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Solution Overview
Problem
Current plastic containers with vacuum panels in the sidewall suffer from aesthetic issues, such as a non-smooth glass-like appearance and wrinkled labels, and structural instability due to vacuum pressures generated during hot-filling and cooling processes.
Innovation Solution
A plastic container design featuring a vacuum panel region located outboard of the sidewall, comprising movable rectangular vacuum panels that accommodate vacuum forces, with horizontal ribs and connecting walls to maintain structural integrity and prevent label disruption, allowing for controlled deformation without compromising the label's appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vacuum panels are formed within the sidewall of the container, then the container can withstand vacuum pressures, but the appearance becomes non-smooth and labels become wrinkled
Solution Approach 1:
The vacuum panel region is repositioned from the sidewall surface to an outboard location, creating a three-dimensional protrusion that separates the vacuum accommodation function from the label application surface. This dimensional relocation allows the label to be applied to a flat sidewall surface while the vacuum panels operate independently in the outboard region, eliminating label wrinkling and maintaining smooth appearance.
2Reliability
If vacuum panels are formed within the sidewall, then vacuum pressures can be accommodated, but the label application surface becomes compromised
Solution Approach 1:
The container wall structure is segmented into distinct functional zones: the sidewall portion maintains a smooth, label-friendly surface, while the outboard vacuum panel region provides the necessary flexibility for vacuum pressure accommodation. This segmentation allows each region to be optimized for its specific function without compromising the other.
3Strength
If the container provides sufficient flexure to compensate for vacuum pressures, then structural integrity is maintained, but deformation occurs
Solution Approach 1:
The container exhibits different mechanical properties in different regions: the sidewall portion maintains rigidity for structural integrity and label stability, while the outboard vacuum panel region provides localized flexibility to accommodate vacuum pressures. This local quality differentiation allows the container to maintain overall shape while accommodating internal vacuum forces.
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 design provides a stable and aesthetically pleasing container that maintains structural integrity while accommodating vacuum pressures, ensuring a smooth label appearance and preventing deformation, thus addressing the limitations of traditional sidewall vacuum panels.
Implementation Method 1
The vacuum panel region occupies an area outboard of the sidewall portion. Each of the vacuum panels are movable to accommodate vacuum forces generated within the container resulting from heating and cooling of its contents.
Implementation Method 2
The cooling reduces the volume of the liquid in the container. This product shrinkage phenomenon results in the creation of a vacuum within the container.
Data Source
AI summary
A plastic container includes an upper portion having a mouth defining an opening into the container. A shoulder region extends from the upper portion. A sidewall portion extends between the shoulder region and a base portion. The base portion closes off an end of the container. A vacuum panel region defined in part by at least two vacuum panels. Each of the vacuum panels are movable to accommodate vacuum forces generated within the container resulting from heating and cooling of its contents. The vacuum panel region occupies an area outboard of the sidewall portion.