Bottle-Shaped Can Neck Profile for Low-Torque Cap Sealing
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Solution Overview
Problem
Existing bottle-shaped cans require high torque to dismount the cap due to a sharply angled curled portion design, which compromises sealing ability when attempting to reduce the cap's opening torque, affecting merchantability and ease of use.
Innovation Solution
A bottle-shaped can design featuring a curled portion with a smooth curved surface, including a leading end section, a diametrically-largest section, and a diametrically-shrunk section, where the sealing member is contacted to the outer circumferential wall section, allowing for easy cap rotation and enhanced sealing without the need for significant radial expansion of the sealing member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the curled portion is shaped with a sharply angled cross-section to fit tightly with the sealing liner, then the sealing ability is improved, but the torque required to dismount the cap increases
Solution Approach 1:
The curled portion is designed with a curved cross-sectional shape instead of a sharply angled one. The curvature allows the sealing liner to contact the curled portion smoothly without requiring radial expansion, thereby maintaining sealing ability while reducing the torque needed to dismount the cap.
Solution Approach 2:
The outer diameter of the curled portion is designed to be substantially equal to the outer diameter of the neck portion opening, rather than decreasing downwardly. This parameter change ensures the sealing liner contacts the curled portion without significant radial expansion, reducing dismounting torque while maintaining sealing effectiveness.
2Ease of operation
If the length of the curled portion below the diametrically-largest portion is reduced to decrease opening torque, then the ease of operation is improved, but the contact area of the sealing liner is reduced thereby reducing sealing ability
Solution Approach 1:
The curved cross-sectional shape of the curled portion allows the sealing liner to maintain contact over a sufficient length without requiring radial expansion. The curvature distributes the contact pressure evenly, ensuring sealing ability is maintained even with adequate contact length that does not impede cap removal.
Solution Approach 2:
The outer diameter of the curled portion is maintained substantially equal to the neck portion opening diameter, eliminating the need for the sealing liner to expand radially. This allows the curled portion to extend downwardly with sufficient length to provide adequate contact area without increasing opening torque.
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 ensures tight sealing while reducing the torque required to open the cap, maintaining sealing ability and enhancing the cap's ease of dismounting, thus improving both functionality and user experience.
Implementation Method 1
a sealing member affixed to an inner surface of the cap is contacted tightly to the curled portion to seal the neck portion
Data Source
AI summary
A bottle-shaped can includes a cap having an excellent sealing ability but easy to be opened. A top section includes a leading end section as an upper end of a neck portion, a diametrically-largest section formed beneath the leading end section, a diametrically-shrunk section extending downwardly from the diametrically-largest section, and an outer circumferential wall section extending downwardly from the diametrically-shrunk section. The leading end section, the diametrically-largest section, and diametrically-shrunk section form a smooth curved surface. A curvature of the diametrically-largest section in a cross-section is zero or negative value, given that a curvature of the diametrically-shrunk section is positive value. A flexion section is formed between the diametrically-shrunk section and the outer circumferential wall section. The outer diameter of the outer circumferential wall section in which the curvature is zero or negative value is larger than an outer diameter of the flexion section.