Two-Part Hinge for Tamper-Proof Nutritional Packaging
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Solution Overview
Problem
Existing packaging for powdered nutritional products, such as infant milk formula, faces challenges with bulky living hinges that limit design flexibility, tamper-proof issues, and increased costs due to material thickness, particularly in mass-produced packaging.
Innovation Solution
A lid assembly with a two-part hinge configuration where the lid and rim portions are integral but can only be engaged in the open position, preventing separation without damage, and featuring a pin and recess system with abutment surfaces and detent mechanisms to ensure secure closure and resistance to unauthorized opening, allowing for a lighter container design while maintaining sealing integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a living hinge is used to connect the lid and rim, then the lid assembly can be formed in a single injection moulding process, but the hinge extends beyond the external boundaries of the lid assembly adding to the overall bulk when stacking containers
Solution Approach 1:
The hinge is divided into two separate parts: a rim portion integral with the rim and a lid portion integral with the lid. These separate portions can be engaged to each other, allowing the hinge to be formed in a single injection moulding process while avoiding the bulk problem of a continuous living hinge extending beyond the lid assembly boundaries.
2Adaptability or versatility
If separate lid and rim assemblies are joined at a hinge, then design flexibility is improved, but the construction becomes sensitive to tampering
Solution Approach 1:
The lid portion and rim portion are designed with engagement features that allow them to be joined in the open position before closure. This preliminary engagement action creates a tamper-proof construction where the hinge connects the lid and rim securely, preventing unauthorized separation while maintaining design flexibility.
Solution Approach 2:
The lid portion and rim portion are merged through engagement to form a unified hinge connection. This combining of separate elements creates both design flexibility and tamper resistance, as the engaged portions work together as an integrated system that prevents unauthorized opening.
3Strength
If thicker material is used to increase individual element strength, then the package strength is improved, but the cost of the package increases
Solution Approach 1:
By segmenting the hinge into separate lid and rim portions that engage with each other, the design distributes structural loads more efficiently. This allows for reduced material thickness while maintaining individual element strength, as each portion can be optimized for its specific function rather than requiring uniform thick construction throughout.
Data Source
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AI summary
A package for a powdered nutritional product comprises a container for receiving the nutritional product, having a base and a peripheral wall. A lid assembly comprises a circumferential rim (10), defining an access opening, for connection to the container and a lid (12), pivotably attached to the rim by at least one hinge having a hinge axis. The lid has an open position and a closed position in which it closes the access opening. The hinge comprises a rim portion, integral with the rim, and a lid portion, integral with the lid, that can be engaged to each other to join the lid to the rim. The hinge is arranged such that the lid portion can only be engaged with the rim portion in the open position of the lid. In the closed position of the lid, the lid portion is locked to the rim portion, preventing separation of the lid portion from the rim portion. The hinge is also arranged to prevent opening of the lid beyond a point at which the package is unstable.