V-Shaped Vacuum Compensation Elements in Hot-Fill Containers
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Solution Overview
Problem
Conventional plastic containers deform or collapse under internal vacuum conditions after hot-filling due to lack of adequate structural support, leading to stress concentrations and potential collapse.
Innovation Solution
The design incorporates V-shaped vacuum compensation elements with nested fields and ridges, providing flexible support to the sidewall while maintaining a cylindrical shape, and an optional label panel for aesthetics and additional strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional cylindrical containers are used without vacuum panels, then the container structure is simple, but the container deforms or collapses under internal vacuum conditions
Solution Approach 1:
The patent employs vacuum panels with V-shaped configurations that are designed to flex inwardly under vacuum pressure. These panels are made from the container wall material itself, allowing them to deform elastically to accommodate the vacuum force while maintaining the overall structural integrity of the container. This resolves the contradiction by providing vacuum resistance through flexible, thin-walled structures rather than rigid reinforcements.
Solution Approach 2:
The container wall is segmented into distinct functional zones: rigid cylindrical segments that maintain the overall shape and vertical posts that provide structural support, interspersed with flexible vacuum panels that accommodate pressure changes. This segmentation allows different parts of the container to perform different functions - some areas remain stiff while others are designed to flex, resolving the contradiction between structural simplicity and vacuum resistance.
2Reliability
If vacuum panels are added to prevent collapse, then the container can withstand vacuum conditions, but the container requires additional structural elements that increase complexity
Solution Approach 1:
The vacuum panels are integrated directly into the container wall structure rather than being separate components. The V-shaped panels are formed as part of the molded container wall, eliminating the need for separate panels or additional fastening mechanisms. This merging of functions reduces overall structural complexity while maintaining reliable vacuum resistance.
Solution Approach 2:
The vacuum panels serve multiple functions: they provide vacuum compensation, maintain structural integrity, and can be positioned to allow label application. The same structural elements (vertical posts and cylindrical segments) that provide mechanical support also serve as the framework for the flexible panels, creating a multi-functional structure that reduces overall complexity.
3Ease of manufacture
If rectangular vacuum panels are used, then the container structure is straightforward, but high stress areas occur at the corners and outside the vacuum panels
Solution Approach 1:
The patent replaces rectangular vacuum panels with V-shaped panels that have curved transitions and rounded corners. The V-shape creates a gradual transition zone that distributes stress more evenly across the panel and into the adjacent rigid cylindrical segments. This curvature eliminates the sharp corners that would create stress concentrations, resolving the contradiction between manufacturing simplicity and stress distribution.
4Weight of moving object
If the container is made lightweight, then the container is more efficient, but the container may lack sufficient structural support under vacuum
Solution Approach 1:
The container structure employs local quality by making different regions of the wall have different properties. The vacuum panels are designed with thinner walls that can flex, while the vertical posts and cylindrical segments maintain sufficient thickness for structural support. This localized variation in wall thickness and stiffness allows the container to be lightweight overall while maintaining necessary structural strength in critical areas.
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 container effectively withstands hot-filling conditions, minimizing deformation and stress concentrations, and can function as a lightweight, grippable container with enhanced label surface functionality.
Implementation Method 1
the contents of the container contract upon cooling, which creates a vacuum condition inside the container
Implementation Method 2
The vacuum panels are configured to inwardly and easily flex in response to internal vacuum
Data Source
AI summary
A lightweight container includes an enclosed base, an upper portion that extends upwardly to a finish; and a body located between the base and the upper portion. The sidewall includes vacuum compensation elements that have an open end and an opposing closed end, and that form a V-shape. Each element has nested fields.