Hot-fill Container Flat Panels Vacuum Absorption
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Solution Overview
Problem
Hot-fill plastic containers, such as PET, face challenges in maintaining their shape during cooling due to internal vacuum pressure, as they are typically equipped with limited vacuum panels that can only mildly absorb contraction, limiting their ability to form unique shapes while maintaining overall cylindrical form.
Innovation Solution
The design incorporates smooth, grooveless vacuum panels separated by continuous circular grooves, allowing for controlled deformation and absorption of internal vacuums, maintaining the container's shape through a combination of panel flexibility and structural reinforcement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If traditional vacuum panels with grooves are used, then the container can absorb internal vacuum pressure, but the container walls contract and deform during cooling
Solution Approach 1:
The container sidewall is divided into multiple flat panel sections separated by grooves. These segmented panels can independently deform to absorb vacuum pressure while the grooves provide structural reinforcement to maintain overall container shape stability.
Solution Approach 2:
Different regions of the container sidewall have different properties: flat panels are designed to be flexible for vacuum absorption, while the grooves providing structural support are designed to be rigid. This local differentiation allows simultaneous shape maintenance and controlled deformation.
2Stability of the object's composition
If vacuum panels are added to absorb internal vacuum, then container shape can be maintained, but the container design becomes more complex
Solution Approach 1:
The vacuum absorption function and structural reinforcement are merged into a single integrated design where flat panels and grooves work together as one system. The grooves serve dual purposes: providing structural support and defining the boundaries of vacuum-absorbing panels, eliminating the need for separate vacuum panel components.
Solution Approach 2:
The groove structures serve multiple functions: they provide structural reinforcement to prevent excessive deformation, define the boundaries of flat panels for vacuum absorption, and create an aesthetically pleasing design. This multi-functionality reduces overall design complexity.
3Stress or pressure
If the container allows controlled deformation to absorb vacuum, then internal pressure can be managed, but the container may lose its cylindrical shape
Solution Approach 1:
The cylindrical sidewall is segmented into multiple flat panels that can deform independently. This segmentation allows the container to absorb vacuum pressure through localized panel deformation while the overall cylindrical shape is maintained through the distributed arrangement of panels and reinforcing grooves.
Solution Approach 2:
Specific localized regions (flat panels) are designed to deform under vacuum pressure, while other regions (groove areas) maintain structural rigidity. This local quality differentiation enables pressure management without compromising the overall cylindrical container shape.
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
This design enables hot-fill containers to absorb internal vacuums in a controlled manner, maintaining their shape and allowing for unique forms while ensuring structural integrity and user handling without deformation.
Implementation Method 1
as the product cools to room temperature, such as 72° F., a negative internal pressure or vacuum pressure builds within the sealed container
Implementation Method 2
the container walls contract as a vacuum pressure is created during hot-fill product cooling
Data Source
AI summary
A container may employ an upper portion defining a mouth, a shoulder portion formed with the upper portion and extending away from the upper portion, a bottom portion forming a base, a sidewall extending between and joining the shoulder portion and the bottom portion, and a plurality of smooth surfaced vacuum panels formed in the sidewall, which may be separated by one or more strengthening grooves. The vacuum panels and/or the container in a profile view may form an hourglass shape. The container may also employ a sidewall utilizing three smooth, grooveless, vacuum panels, which may form a triangle in cross-section. The vacuum panels may be concave inward toward a central vertical axis of the container and have an hourglass shape when the container is viewed in a side view.