Container Cap Skew Prevention via Thread Engagement Timing
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Solution Overview
Problem
Conventional containers with tamper evident bands often result in a skewed cap attachment, particularly for wide mouth containers with diameters of 30 mm or more, due to the resiliently deformable portion of the band pressing against the bead portion, leading to improper capping angles.
Innovation Solution
A container design featuring a male thread with a ring-shaped bead portion and a cap with a ring-shaped skirt wall and tamper evident band, where the first distance from the male thread engagement upper end to the bead portion is greater than the second distance from the female thread engagement lower end to the resiliently deformable portion, ensuring the band abuts the bead portion only after proper thread engagement, thus preventing cap skewing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the resiliently deformable portion of the TE band is pressed against the bead portion during capping, then the TE band can be deformed to ride over the bead portion, but the cap becomes inclined and skewed during attachment
Solution Approach 1:
The male thread engagement is designed to occur before the resiliently deformable portion contacts the bead portion. The cap is first positioned and threaded onto the mouth, establishing proper alignment. Only after this preliminary threading action does the resiliently deformable portion engage with the bead portion, ensuring the cap remains properly aligned throughout the process
Solution Approach 2:
The capping process is divided into two distinct stages: first, the thread engagement stage where the cap is positioned and aligned on the mouth, and second, the TE band deformation stage where the resiliently deformable portion is pressed against the bead portion. This segmentation ensures that alignment is established before deformation occurs, preventing skewing
2Area of stationary object
If a wide mouth container with diameter of 30 mm or more is used, then the container can accommodate larger contents, but the cap is more prone to skewing during attachment
Solution Approach 1:
For wide mouth containers, the preliminary thread engagement action becomes even more critical. The male thread and female thread are designed to engage first, establishing the cap's position and alignment on the wider mouth surface before any deformation occurs, preventing the cap from skewing during the capping process
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 effectively prevents cap skewing during attachment by ensuring the tamper evident band abuts the bead portion after initial thread engagement, maintaining proper alignment and ensuring secure closure.
Implementation Method 1
the tamper evident band has a resiliently deformable portion which is resiliently deformed by being pressed from above against the bead portion to ride over the bead portion downward
Data Source
AI summary
In a container, a first distance from an engagement upper end of a male thread of a mouth to a bead portion is larger than a second distance from an engagement lower end of a female thread of a cap to a resiliently deformable portion of a tamper evident band.