Hinged Closure First-Opening Indicator Design
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Solution Overview
Problem
Existing hinged closures in two or three parts face challenges in manufacturing small dimensions where detectable displacement or deformation for opening is difficult, leading to environmental concerns and increased costs due to complex assembly and limited material variations.
Innovation Solution
A closure device with a fastening base and a lid connected by a hinge, featuring a snap-in fastening ring and a frangible first-opening indicator that separates into a free space upon opening, allowing visible indication of use and preventing indicator loss, while enabling different material and color combinations for identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a first-opening indicator is connected to both the lid and the fastening ring, then the opening can be detected by breaking the indicator into two parts, but on closures of small dimensions it proves difficult to obtain a displacement or deformation that is detectable by the consumer
Solution Approach 1:
The patent transitions from a two-part connection (lid and fastening ring) to a three-part system by introducing the base as an intermediate component. The first-opening indicator is connected to the base instead of the fastening ring, creating a longer path that amplifies displacement and deformation, making the opening status more detectable on small-dimensional closures.
2Loss of information
If a break away tab is used instead of a first-opening indicator, then detectable opening is achieved, but precautions must be taken to ensure the tab does not separate from the closure after opening, which would be detrimental from the standpoint of respect for the environment
Solution Approach 1:
The patent extracts the first-opening indicator from the movable lid structure and anchors it to the stationary base. This separation ensures that when the lid opens, the indicator remains attached to the closure system through the base, preventing environmental contamination while maintaining detectability of the opening status.
3Loss of information
If end stops projecting outward axially from the bottom of the base are provided to maintain an annular dead volume for housing the first-opening indicator, then proper assembly is ensured, but a substantial axial space requirement is created
Solution Approach 1:
The patent incorporates the first-opening indicator into the base structure during the base manufacturing process, before assembly with the lid and fastening ring. This preliminary integration eliminates the need for additional axial space to house the indicator, as it is already positioned within the base's structural framework.
4Ease of manufacture
If the base and the lid belong to the same part, then manufacturing is simplified, but the possible variations in colour and material for the portion visible externally are limited unless bi-injection process is used, which would raise the cost
Solution Approach 1:
The patent divides the closure into separate functional components: the base (forming the first part with fastening function) and the lid (forming the second part with visible external surface). This segmentation allows each component to be manufactured from different materials and colors independently, enabling greater versatility without requiring complex bi-injection processes.
Data Source
AI summary
A closure device includes a first part forming a fastening base for fastening to the container neck and having at least one peripheral fastening groove and a second part forming a lid, a fastening ring defining a reference geometrical axis, and a hinge connecting the fastening ring to the lid for guiding the lid relative to the fastening ring between a closed position and an open position, the fastening ring being engaged by snap-in action into the fastening groove of the first part. The second part additionally also forms a first-opening indicator and a frangible connection between the first-opening indicator and a peripheral rim flange of the lid, a free space being maintained in the axial direction between the fastening ring and the first-opening indicator in the closed position prior to the first opening, the first-opening indicator being retained by at least one lock zone of the first part so as to be separated from the lid and drop into the free space upon the first opening.