Tamper-Evident Closure with Segmented Pourer
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Solution Overview
Problem
Existing tamper-evident closures for containers, particularly in the spirits industry, face challenges such as complex construction, material strength issues due to the need for strong materials like polycarbonate, and health concerns related to bisphenol A (BPA) in these materials, which complicates the design and functionality of pourer components.
Innovation Solution
A closure assembly with a pourer comprising two parts - a lower part fixed to the container neck and an upper part that moves irreversibly upon first opening, allowing for a simpler design, greater strength, and the use of different materials for each part, where the upper part can be made of a weaker, transparent material without the need for polycarbonate, and locking mechanisms ensure irreversible locking in the second position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single-piece pourer is used to fix to the container neck, then sufficient strength is achieved, but the material must be polycarbonate which contains harmful BPA
Solution Approach 1:
The pourer is divided into two separate parts: a lower part that remains fixed to the container neck and an upper part that can move irreversibly. This segmentation allows the lower part to be made of strong material for fixing while the upper part can be made of safer alternative materials that contact the liquid.
2Object-affected harmful factors
If a two-part pourer with irreversible movement is used, then BPA-free materials can be used for the upper part, but the construction becomes more complex
Solution Approach 1:
The locking mechanism is integrated into the interaction between the upper and lower pourer parts themselves, rather than being a separate component. The irreversible locking is achieved through the geometric interaction of the parts' surfaces, simplifying the overall construction while maintaining the two-part structure.
3Strength
If polycarbonate is used for the pourer, then strength and fixability are ensured, but transparency and aesthetic requirements cannot be met
Solution Approach 1:
Different parts of the pourer have different material properties suited to their specific functions. The lower part uses strong material for structural integrity and fixing, while the upper part uses transparent material for aesthetics and liquid contact, with each part optimized for its local requirements.
4Reliability
If a ratchet arrangement made of soft material is used for tamper evidence, then irreversible locking is achieved, but the structure becomes weaker
Solution Approach 1:
The traditional soft material ratchet arrangement is replaced with a geometric locking mechanism between the upper and lower pourer parts. The irreversible locking is achieved through the interaction of shaped surfaces and features that physically prevent re-closing, eliminating the need for soft material deformation and maintaining structural strength.
Data Source
Figure 1~2
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Figure 5
AI summary
The present invention relates to a tamper evident closure (1) comprising a pourer (20) with a lower part (30) and an upper part (40) movable relative to the lower part (30) from a first position to a second position, a cap (50), attachment means (80) for attaching the cap (50) with the upper part (40). In the first position the cap (50) and the lower part (30) are adjacent and the outer surface (52) of the cap (50) is able to be grasped for opening the container (10). Upon first opening, rotation of the cap (50) causes the upper part (40) and the cap (50) to move relative to the lower part (30) from the first position to the second position. In the second position, there is a gap between the cap (50) and the lower part (30) and the upper part (40) and the lower part (30) are adapted to become mutually irreversibly locked so that the attachment means (80) can be released to remove the cap (50) from the upper part (40).