Tamper-Evident Cap Attitude Maintaining Piece Design
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Solution Overview
Problem
Conventional caps with tamper-evident bands require higher torque to open due to increased friction between the attitude maintaining piece and the container flange, causing user discomfort, especially with manufacturing errors in dimensions.
Innovation Solution
A cap design with a TE band featuring a release part between the attitude maintaining piece and the band body, reducing contact pressure and friction by allowing the attitude maintaining piece to fold outward, and forming it narrower and thinner than the flap, with multiple pieces at both ends to maintain the angle between the flap and the TE band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an attitude maintaining piece is held between the container flange and the TE band to prevent flap inversion, then the flap inversion is prevented, but the contact pressure and friction increase causing higher opening torque
Solution Approach 1:
The attitude maintaining piece is divided into multiple separate pieces rather than a single continuous structure. This segmentation reduces the total contact area with the container flange, thereby reducing friction and opening torque while still maintaining the flap's attitude through distributed contact points
Solution Approach 2:
The attitude maintaining piece is designed with varying thickness, being thinner at the contact region with the container flange and thicker at other regions. This local quality variation reduces contact pressure and friction at the critical interface while maintaining sufficient structural integrity for attitude maintenance
2Reliability
If the attitude maintaining piece is made thicker and wider to improve engagement stability, then the engagement reliability improves, but the friction and opening torque increase
Solution Approach 1:
The attitude maintaining piece features non-uniform thickness distribution, being thinner where it contacts the container flange and thicker elsewhere. This provides sufficient engagement stability through the thicker regions while the thinner contact region minimizes friction and opening force
Solution Approach 2:
Multiple discrete attitude maintaining pieces are distributed around the TE band instead of using a single large piece. This achieves engagement stability through distributed contact while reducing total friction area and opening force
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 reduces the torque required to open the cap, prevents flap inversion, and minimizes material costs while maintaining reliable engagement with the container flange, making the opening process more comfortable for users.
Implementation Method 1
the flap 132 falls down toward the side of the container mouth cylindrical part 151 due to its elasticity
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
To provide a cap and a capped container that prevent a user from feeling a sense of discomfort about a torque when the cap is opened while reliably preventing the inversion of a flap when the cap is opened. Provided is a cap (10) having a TE band (30) connected to a lower end of a cap body (20) via a weakening part (40), with this TE band (30) having a flap (32) folded back toward an inner peripheral side of a band body part (31), the flap (32) has a flange engaging part (32b) capable of engaging with a lower side of a container flange (53) when the cap is attached to a container and an attitude maintaining piece (32c) arranged on an outer peripheral side of the container flange (53) when the cap is attached to the container, and an inner peripheral wall of the band body part (31) has a release part (22c) that forms a gap between an outer peripheral wall of the attitude maintaining piece (32c) and the inner peripheral wall of the band body part (31) when the cap is attached to the container.