Hot-fill Container Sidewall Segmentation for Vacuum Deflection
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Solution Overview
Problem
Conventional hot-fill plastic containers with flexible vacuum panels often experience uneven or asymmetric deflection during volumetric contraction, limiting their ability to achieve reliable vacuum uptake capacity and being aesthetically unappealing due to design constraints.
Innovation Solution
A plastic container design featuring a sidewall with a plurality of flexible panels and posts, where the posts have specific width ratios and shapes to ensure consistent and reliable deflection under vacuum uptake conditions, optimizing the vacuum panel configuration for maximal reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vacuum panels are made larger to increase vacuum uptake capacity, then the container can accommodate more volumetric contraction, but the aesthetic appearance deteriorates due to design constraints
Solution Approach 1:
The patent divides the vacuum panel structure into multiple smaller panels separated by posts, creating a segmented configuration. This segmentation allows the total vacuum uptake capacity to be distributed across multiple panels while maintaining aesthetic appearance through the post separations. The segmented design resolves the contradiction by achieving reliable vacuum uptake without requiring a single large panel that would compromise aesthetics.
2Shape
If vacuum panels are made smaller to maintain aesthetic appearance, then the container maintains better visual appeal, but the vacuum uptake capacity decreases
Solution Approach 1:
The patent uses multiple smaller vacuum panels arranged in a segmented configuration around the container. By distributing the vacuum uptake function across multiple smaller panels rather than using one large panel, the design maintains aesthetic appearance while achieving the required total vacuum uptake capacity. The segmentation principle allows the container to meet both aesthetic and functional requirements simultaneously.
3Ease of manufacture
If conventional vacuum panel configurations are used, then manufacturing is simpler, but uneven or asymmetric deflection occurs under vacuum uptake conditions
Solution Approach 1:
The patent applies local quality by giving each vacuum panel and post specific geometric characteristics optimized for uniform deflection. The posts are designed with particular width ratios and the vacuum panels have specific shapes that promote symmetric deformation under vacuum. This localized optimization of panel and post geometry ensures consistent deflection behavior while maintaining manufacturing feasibility through standard molding processes.
Solution Approach 2:
The patent employs asymmetric post designs with specific width ratios (minimum width to maximum width between 0.30-0.70) to achieve symmetric deflection behavior. The asymmetric geometry of individual posts compensates for potential asymmetries in the overall structure, ensuring that all panels deflect uniformly under vacuum uptake conditions. This use of asymmetric elements to achieve symmetric performance resolves the contradiction between manufacturing simplicity and deflection consistency.
4Reliability
If the number of posts is increased to support more vacuum panels, then vacuum uptake reliability improves, but device complexity increases
Solution Approach 1:
The patent segments the vacuum panel system into multiple units separated by posts, creating a modular structure. This segmentation approach distributes the vacuum uptake function across multiple smaller panels, improving reliability through redundancy and uniform load distribution. The segmented design achieves enhanced reliability without excessive complexity by using a reasonable number of panels and posts that can be efficiently manufactured as an integrated structure.
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 optimized vacuum panel configuration in the container body allows for consistent and reliable volumetric adjustment, enhancing the container's ability to accommodate internal changes while maintaining aesthetic appeal by ensuring uniform deflection and increased vacuum uptake capacity.
Implementation Method 1
the vacuum panels are disposed about the entire circumference of the container sidewall... designed to flex inwardly as the volume of the product within the container undergoes shrinkage
Implementation Method 2
After filling, such containers undergo significant volumetric shrinkage as a result of the cooling of the product within the sealed container
Implementation Method 3
The posts are respectively interposed between the flexible panels. Each of the plurality of posts has a minimum width and a maximum width, and a ratio of the minimum width to the maximum width is within a range of about 0.30 to about 0.70
Data Source
AI summary
A plastic container that is adapted for adjustment to internal volumetric changes such as those that occur during the hot-fill process includes a container body defining an internal space and having a sidewall. The container body has a maximum lateral dimension and a plurality of flexible panels and posts defined in the sidewall. The posts are respectively interposed between the flexible panels around the outer circumference of the sidewall. Each of the plurality of posts has a minimum width and a maximum width, and a ratio of the minimum width to maximum width is preferably within a range of about 0.3 to about 0.7. A ratio of the minimum width to the maximum lateral dimension is preferably within a range of about 0.05 to about 0.30. In addition, a ratio of the maximum width to the maximum lateral dimension is preferably within a range of about 0.15 to about 0.45.