Polygonal Hot-Fill Bottle Vacuum Panels
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Solution Overview
Problem
Existing blow-molded plastic containers for hot-filled beverages face issues with buckling and crushing when gripped by hand due to vacuum-induced stress, and existing solutions do not adequately address these problems while maintaining grippability and structural integrity.
Innovation Solution
The design incorporates vacuum responsive panels between planar segments of the container's sidewall, which expand axially to counteract vacuum pressure and feature outwardly projecting bumper portions to resist compressive forces, ensuring the container remains grippable and resistant to buckling and crushing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vacuum responsive panels are used to compensate for vacuum pressure, then the container can maintain its shape under vacuum, but the vertical supporting elements (posts or lands) may buckle due to small differences in wall thickness or geometry
Solution Approach 1:
The container sidewall is divided into multiple planar segments that form a polygonal cross-section. These segments are separated by vertically extending reinforcing ribs, creating a segmented structure that distributes vacuum forces evenly across multiple independent panels, preventing localized buckling while maintaining overall structural integrity.
Solution Approach 2:
The container employs a polygonal cross-section with curved transitions between facets rather than sharp angles. This geometric design creates inherent structural rigidity that resists buckling of vertical supporting elements while allowing the vacuum-responsive panels to flex inward uniformly under vacuum pressure.
2Ease of operation
If the container is designed with a grippable geometry, then it can be easily held by one hand, but the sidewall may be more susceptible to crushing forces applied during gripping
Solution Approach 1:
The sidewall is segmented into multiple planar facets separated by reinforcing ribs. These ribs act as structural strengtheners that resist crushing forces applied during hand gripping, while the flat facets between them provide comfortable contact surfaces for fingers, achieving both grippability and crush resistance.
Solution Approach 2:
The container utilizes a composite structural design combining thin-walled vacuum-responsive panels with thicker reinforcing ribs. This composite approach allows the thin panels to flex under vacuum while the thicker ribs provide localized strength against external crushing forces during handling.
3Stress or pressure
If the container uses traditional vertical posts or lands to separate vacuum panels, then the structure can support vacuum pressure, but buckling still occurs due to manufacturing variations in wall thickness
Solution Approach 1:
The sidewall is divided into multiple planar segments forming a polygonal structure. Each segment acts as an independent vacuum-responsive panel separated by reinforcing ribs, distributing vacuum stresses evenly and preventing buckling that occurs in traditional designs with fewer, larger panels.
Solution Approach 2:
The design transitions from traditional vertical posts to a polygonal faceted structure where the reinforcing elements extend both vertically and diagonally. This multi-dimensional geometric configuration creates a more stable framework that resists buckling while maintaining vacuum compensation capability.
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 solution effectively resists buckling and crushing, maintaining structural integrity and facilitating easy handling of the container after opening, while the vacuum responsive panels provide a controlled response to thermally induced vacuum, preventing buckling of vertical supporting elements.
Implementation Method 1
The vacuum responsive panels can be initially positioned at a non-protruding position as compared with the vertical posts or lands. The vacuum responsive panels move inwardly in response to, and to compensate for, an increasing vacuum within the container.
Data Source
AI summary
A blow-molded container has a base with a polygonal perimeter. A lower margin joins the base to a side wall extending upward to an upper margin. A shoulder extends upward and axially inward above the upper margin to a finish defining an opening for a closure. The upper and lower margins of the side wall having a plurality of horizontal linear segments joined together by corner portions. An even number of horizontally adjacent planar segments are joined together to define a polygonal waist located between the upper and lower margins. A vacuum responsive panel is situated between each of the linear segments of the upper and lower margins and an aligned waist planar segment. Lateral edges of each vacuum responsive panel are joined by generally vertical, axially converging surfaces extending between each margin corner portion and an aligned planar segment of the waist.