Circumferential Rib for PET Container Neck Finish
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Solution Overview
Problem
Conventional PET containers with wide mouth openings and high crystallinity levels experience reduced structural integrity and seal integrity issues due to inward forces from closure caps when exposed to high temperatures, leading to low closure removal torque and potential seal failure.
Innovation Solution
Incorporating a circumferential rib or groove around the neck finish of the container, positioned between the top edge and the start of threads, to enhance structural integrity and hoop strength, thereby resisting deformation and maintaining seal integrity under high temperature exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the neck finish is made with high crystallinity to maintain seal integrity at elevated temperatures, then seal integrity is improved, but the structure becomes more susceptible to deformation under inward forces from closure caps
Solution Approach 1:
The patent applies local quality by positioning a circumferential rib at a specific location on the neck finish - between the top edge and the start of threads - where it is most needed to resist inward forces from closure caps. This localized reinforcement provides targeted structural support without requiring the entire neck finish to have enhanced crystallinity, thus maintaining seal integrity while preventing deformation at the critical stress point.
Solution Approach 2:
The patent utilizes curvature by forming a circumferential rib that creates a reinforced hoop structure around the neck finish. This curved, ring-shaped reinforcement resists radial inward forces from closure caps more effectively than a flat or angular structure would, leveraging the geometric strength of curved shapes to prevent deformation while maintaining the high crystallinity needed for seal integrity at elevated temperatures.
2Strength
If a circumferential rib is added to increase hoop strength and prevent deformation, then structural integrity is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent merges the circumferential rib reinforcement with the existing neck finish structure, integrating the reinforcement feature into the primary molding process rather than adding it as a separate component or requiring secondary processing. This combining approach allows the rib to be formed as part of the neck finish itself, increasing hoop strength while minimizing the increase in manufacturing 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
The rib or groove design significantly increases the hoop strength of the neck finish, preventing deflection and deformation caused by heat and inward forces, thus maintaining closure removal torque and seal integrity even at elevated temperatures.
Implementation Method 1
The rib or groove design significantly increases the hoop strength of the neck finish, preventing deflection and deformation caused by heat and inward forces
Implementation Method 2
maintaining closure removal torque and seal integrity even at elevated temperatures
Implementation Method 3
Incorporating a circumferential rib or groove around the neck finish of the container, positioned between the top edge and the start of threads, to enhance structural integrity and hoop strength, thereby resisting deformation
Data Source
AI summary
A container including a finish, a sidewall portion, a base portion, and an inwardly directed rib member. The finish has a thread portion and an opening formed by the finish. The sidewall portion extends from the finish. The base portion extends from the sidewall portion and encloses the sidewall portion to form a volume for retaining a commodity. The inwardly directed rib member is disposed circumferentially about the finish.