Heat Set Container Collapsible Ribs Vacuum Force Absorption
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Solution Overview
Problem
Conventional PET containers face challenges in maintaining material integrity and clarity due to crystallinity issues, and they struggle with internal vacuum forces generated during hot-filling, leading to potential deformation and weight inefficiencies.
Innovation Solution
The design incorporates vertically oriented collapsible rib features that absorb internal vacuum forces, reducing residual forces and allowing for material weight reduction while maintaining structural integrity, through a combination of mechanical and thermal processing techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thermal processing is used to increase PET crystallinity to maintain material integrity during hot-filling, then the container's strength and temperature resistance improve, but the container becomes opaque and loses clarity
Solution Approach 1:
The patent applies different crystallinity levels to different regions of the container. The bottom portion is heat-set to approximately 40-50% crystallinity for strength during hot-filling, while the sidewall portions are maintained at lower crystallinity (20-30%) to preserve clarity. This local differentiation allows simultaneous achievement of both strength and transparency in different functional areas.
2Ease of manufacture
If conventional PET containers are used without collapsible features, then the manufacturing process is simpler, but the containers cannot effectively absorb internal vacuum forces during hot-filling, leading to deformation
Solution Approach 1:
The patent incorporates collapsible rib features that dynamically respond to internal vacuum forces during hot-filling. These ribs are designed to collapse inward when vacuum pressure is applied, effectively absorbing the stress and preventing container deformation. After cooling, the ribs return to their original position, maintaining the container's structural integrity and appearance.
3Strength
If more material is used to increase container strength and resist vacuum forces, then the container's structural integrity improves, but the container weight increases and handling efficiency decreases
Solution Approach 1:
The patent divides the container wall into multiple rib segments that can independently collapse under vacuum pressure. This segmentation allows the container to absorb vacuum forces through controlled deformation of individual ribs rather than requiring uniformly thick walls throughout, thereby reducing overall material usage and weight while maintaining structural integrity.
4Reliability
If the container is designed with collapsible rib features to absorb vacuum forces, then the container's ability to withstand hot-filling improves, but the device complexity increases
Solution Approach 1:
The patent integrates the collapsible rib features directly into the container wall structure during the blow-molding process, rather than adding separate components. The ribs are formed as integral parts of the container body, combining the structural function of the wall with the vacuum-absorbing function of the collapsible features, thereby minimizing additional complexity.
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 approach enhances top-load capability, improves ergonomic gripping, and results in a stronger, lighter container with reduced deformation risks and increased clarity, while also allowing for cost-effective production and improved handling.
Implementation Method 1
vertically oriented collapsible rib features capable of forming a reinforced container when under vacuum
Implementation Method 2
thermal processing involves heating the material (either amorphous or semi-crystalline) to promote crystal growth
Implementation Method 3
thermal processing of PET material results in a spherulitic morphology that interferes with the transmission of light
Implementation Method 4
Mechanical processing involves orienting the amorphous material to achieve strain hardening. This processing commonly involves stretching an injection molded PET preform along a longitudinal axis and expanding the PET preform along a transverse or radial axis
Data Source
AI summary
A heat set container including a base portion, a shoulder portion, and a sidewall portion extending from the shoulder portion to the base portion. The shoulder portion, the sidewall portion and the base portion cooperate to define a receptacle chamber within the container into which product can be filled. A plurality of vacuum panels are equidistantly disposed about the shoulder portion. A plurality of transition lands are disposed between adjacent ones of the plurality of vacuum panels and spaced outwardly relative thereto. The plurality of vacuum panels cooperate to be inwardly collapsible from a first outside diameter to a second outside diameter in response to at least internal vacuum forces.