Hot-fill Container Ribs for Vacuum Pressure Resistance
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Solution Overview
Problem
Hot-fill plastic containers, such as PET, face challenges in maintaining structural integrity and rigidity due to vacuum pressures created by product shrinkage during the hot-fill process, leading to deformation and instability.
Innovation Solution
The design incorporates a series of horizontal ribs with chamfered edges along the sidewall and grip portions, providing additional structural strength and support, which helps in managing vacuum pressures and maintaining container stability during filling, packaging, and shipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the amount of plastic is reduced to lower material costs, then material cost savings are achieved, but container rigidity and structural integrity decrease
Solution Approach 1:
The container wall is segmented into multiple horizontal ribs that divide the continuous wall structure into discrete segments. This segmentation allows the wall to maintain structural integrity through the distributed rib structures while using less overall material, as the ribs provide localized reinforcement where needed rather than requiring uniform wall thickness throughout.
Solution Approach 2:
The horizontal ribs create local variations in wall thickness and density, concentrating material where structural support is needed most (at the rib locations) while maintaining thinner walls in the spaces between ribs. This local quality approach optimizes material distribution to achieve maximum strength with minimum material usage.
2Loss of substance
If the amount of plastic is reduced to lower material costs, then material cost savings are achieved, but container stability under vacuum pressure decreases
Solution Approach 1:
The horizontal ribs segment the container wall into multiple sections that can independently flex and respond to vacuum pressure. This segmentation prevents the entire wall from deforming uniformly, thereby maintaining container stability under vacuum conditions while using reduced material quantities.
Solution Approach 2:
The ribbed structure provides dynamic flexibility to the container wall, allowing it to flex and adapt to vacuum pressure changes without permanent deformation. The ribs act as reinforcement elements that enable the thin-walled container to maintain its shape and stability under varying pressure conditions.
3Weight of moving object
If lightweight construction is maintained, then material cost and weight are reduced, but resistance to deformation under vacuum pressure is compromised
Solution Approach 1:
The horizontal ribs create localized regions of increased thickness and strength at regular intervals along the container wall. This local quality approach allows the majority of the wall to remain thin and lightweight, while the ribbed sections provide concentrated reinforcement that resists vacuum-induced deformation.
Solution Approach 2:
The container wall functions as a composite structure combining thin-walled sections with reinforced ribbed sections. This composite approach integrates materials of varying thickness and density within a single structure, achieving both lightweight construction and deformation resistance through the synergistic combination of different wall configurations.
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 enhanced structural support and rigidity of the container prevent deformation, ensure aesthetic appeal, and withstand handling and shipping stresses, while maintaining lightweight construction.
Implementation Method 1
The sidewall portion and the grip portion each include a plurality of horizontal ribs. The horizontal ribs of the sidewall portion each include at least one chamfered rib that provides additional structural strength and support
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. If not controlled or otherwise accommodated, these vacuum pressures result in deformation of the container
Implementation Method 3
Hot-fillable plastic containers, therefore, should provide sufficient flexure to compensate for the changes of pressure and temperature, while maintaining structural integrity and aesthetic appearance
Data Source
AI summary
A plastic container including an upper end having an aperture defining an opening of the container. A lower end defines a base of the container. A sidewall portion merges into a grip portion and extends between the upper end and the lower end. The sidewall portion and the grip portion each include a plurality of horizontal ribs. The horizontal ribs of the sidewall portion each include at least one chamfered rib that provides additional structural strength and support to the container during hot fill, packaging and shipping operations.