Dispenser Fastening Element With Protruding Profiles
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Solution Overview
Problem
Existing fastening elements for securing dispensers to container necks, particularly those containing propellant gases, face challenges in achieving a leak-proof seal due to high stresses on the container edge, risking seal cutting and leakage, while maintaining manufacturing tolerances and assembly simplicity.
Innovation Solution
A fastening element with a compression part featuring protruding profiles that exert balanced stresses on the neck gasket, radially offset from the container edge, to distribute stress more evenly and increase contact surface and pressure, reducing the risk of seal cutting and leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flat crimping cap is used to compress the neck seal, then the sealing function is achieved, but high stresses concentrate on the container edge causing seal cutting and leakage risk
Solution Approach 1:
The compression cap transitions from a flat surface to a profiled surface with protruding elements that distribute compression forces locally across multiple contact points on the neck seal, preventing stress concentration at any single point while maintaining effective sealing
Solution Approach 2:
The profiled compression cap is designed with pre-positioned protruding elements that are configured to engage and distribute stresses evenly on the neck seal before the actual crimping operation occurs, preventing seal cutting during assembly
2Reliability
If higher compression force is applied to ensure sealing, then leakage risk is reduced, but the risk of cutting the seal by the container edge increases
Solution Approach 1:
The profiled compression cap creates multiple localized contact zones on the neck seal rather than a single flat contact surface, distributing the compressive force to achieve sealing while preventing excessive stress concentration that would cause cutting
Solution Approach 2:
The protruding profiles on the compression cap act as intermediary elements between the cap and the neck seal, mediating the transmission of compressive forces to distribute them evenly and prevent direct concentration of high stresses on the seal material
3Reliability
If a profiled compression cap with protruding elements is used, then stress distribution on the neck seal is improved, but the device complexity increases
Solution Approach 1:
The compression cap surface is segmented into multiple protruding elements or profiles rather than a continuous flat surface, allowing stress distribution across discrete contact points while keeping the overall cap structure simple and manufacturable
Solution Approach 2:
The compression cap geometry is modified by adding protruding elements with specific dimensions and spacing, changing the physical parameters of the cap to achieve optimal stress distribution while maintaining simplicity in the overall device design
Data Source
Figure 1~4
AI summary
A fluid product dispensing device, comprising a dispensing member (20), such as a pump or a valve, mounted on the neck (31) of a container (30) containing a product to be dispensed, with interposition of a neck seal (1) to ensure sealing at said neck (31) of the container (30), said dispensing member (20) being mounted on said neck (31) by means of an attachment element (10), comprising an attachment portion (12) for attaching to said neck (31) of the container (30) and a compression portion (13) for compressing said neck seal (1) against said neck (31) of the container (30), said compression portion (13) comprising at least one protruding profile (17) capable of exerting stresses in said neck seal (1) after assembly, in which, after assembly, said neck (31) of the container (30) generates first stresses in said neck seal (1) and said at least one protruding profile (17) of the attachment element (10) generates second stresses in said neck seal (1), said first stresses being approximately axially opposite said second constraints, said neck (31) of the container comprising an upper edge with a curved shape, said neck (31) defining, at its end, a ridge (32) in contact with said neck seal (1), said at least one protruding profile (17) being disposed radially outside or inside said ridge (32) when the attachment element (10) is assembled on the neck (31) of the container (30), said first and second stresses being approximately axially opposite one another but radially offset, such that said first and second stresses balance at least partially.