Petaloid Base Feet Geometry for Carbonated Container Stability
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Solution Overview
Problem
Conventional petaloid base designs for plastic containers do not adequately withstand extreme pressures, such as those from carbonated beverages, especially when manufactured at high speeds, leading to potential breakage and instability.
Innovation Solution
A one-piece plastic container with a petaloid base featuring a contact diameter ratio of 70-74%, contact area ratio of 20-23%, and fillet radius of 4-10 mm, composed of biaxially oriented polyethylene terephthalate, which includes a nub and corner transition portions to enhance stability and pressure resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional petaloid base designs are used, then manufacturing is simple, but the base cannot withstand extreme pressures from carbonated beverages
Solution Approach 1:
The base structure incorporates feet with specific geometric parameters (contact diameter ratio of 0.65-0.75, contact area ratio of 0.20-0.30) to concentrate and distribute pressure locally, enhancing pressure resistance in critical areas without requiring overall structural complexity
Solution Approach 2:
The feet are designed with curved surfaces and rounded contact points rather than flat or sharp edges, allowing for better pressure distribution and stress concentration management, which improves the base's ability to withstand extreme pressures
2Stability of the object's composition
If conventional petaloid base designs are used, then manufacturing is simple, but the container exhibits insufficient stability when empty and filled
Solution Approach 1:
The base design features feet with optimized contact area ratios (0.20-0.30) and contact diameter ratios (0.65-0.75) to maximize stability in critical support areas while keeping the overall base geometry relatively simple
Solution Approach 2:
The base geometry is pre-designed with specific dimensional ratios during manufacturing to ensure inherent stability, eliminating the need for additional stabilizing features or post-manufacturing adjustments
3Reliability
If conventional petaloid base designs are used, then production speed can be high, but breakage resistance is insufficient
Solution Approach 1:
The feet are designed with optimized geometric parameters including contact diameter ratio (0.65-0.75), contact area ratio (0.20-0.30), and fillet radius (4-10 mm) to enhance breakage resistance while remaining compatible with high-speed injection molding processes
4Stability of the object's composition
If the base is designed with larger contact area, then stability increases, but the container volume capacity decreases
Solution Approach 1:
The base design concentrates the contact area into specific feet regions with optimized contact area ratios (0.20-0.30), providing maximum stability with minimum base material usage, thereby preserving container volume capacity
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 design significantly increases resistance to breakage and stability, both empty and filled, while maintaining performance at high production speeds, as evidenced by improved 'time to failure' in stress crack resistance tests.
Implementation Method 1
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 to form a PET container.
Implementation Method 2
PET is a crystallizable polymer, meaning that it is available in an amorphous form or a semi-crystalline form. The ability of a PET container to maintain its material integrity relates to the percentage of the PET container in crystalline form, also known as the 'crystallinity' of the PET container.
Data Source
AI summary
A one-piece plastic container includes a body defining a longitudinal axis and having an upper portion, a sidewall portion and a base portion. The base portion defines a plurality of feet extending therearound. The base portion defines a contact diameter ratio of approximately 70-74% and a contact length ratio of approximately 20-23% for a plastic container having a volume capacity of approximately one (1) liter (1000 cc). According to additional features, the one-piece plastic container can have a nub defined on the base portion. For a one-piece plastic container having a volume capacity of approximately one (1) liter (1000 cc), the nub has a diameter of approximately 3-7 mm (0.12-0.28 inch), the base portion defines a contact area ratio of approximately 23-25%, and each foot defines corner transition portions each having a fillet radius of approximately 4-10 mm (0.16-0.39 inch).