Tamper-Evident Aerosol Cap With Frangible Release Tabs

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Solution Overview

Problem

Existing aerosol caps do not provide a visible indication of tampering or use, leading to potential product testing and restocking issues, which can result in lost revenue and safety hazards.

Innovation Solution

An aerosol cap with a design that includes a top deck, outer shell, and inner shell, featuring release tabs secured by frangible connections, which break visibly upon tampering, and interact with inner shell components to lock in a tampered position, indicating use.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If existing aerosol caps are used to prevent inadvertent actuation, then child resistance is improved, but tamper evidence capability deteriorates

Engineering Contradiction:

Improvechild resistanceVSAvoidtamper evidence

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The cap is divided into multiple segments including an outer shell, inner shell, release tabs, and frangible connections. This segmentation allows the cap to maintain child resistance through its overall structure while incorporating specific tamper-evident features through the frangible connections that break upon tampering, providing visual evidence of access.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Frangible connections serve as intermediary elements between the outer shell and inner shell components. These connections normally maintain the cap's integrity for child resistance but are designed to break under tampering forces, thereby providing tamper evidence without compromising the primary child safety function.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If aerosol caps are made difficult to remove with squeeze-and-pull action, then child resistance is improved, but ease of operation deteriorates

Engineering Contradiction:

Improvechild resistanceVSAvoidease of removal

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The cap incorporates dynamic elements including movable release tabs and frangible connections that respond to applied forces. The squeeze-and-pull mechanism requires coordinated dynamic action that is difficult for children but manageable for adults, while the frangible connections provide a failure mode that facilitates removal once activated.

Inventive Principle:

Principle #15Dynamics

3Loss of information

If frangible connections are added to provide tamper evidence, then device complexity increases, but manufacturing precision deteriorates

Engineering Contradiction:

Improvetamper evidenceVSAvoidcap structure

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The frangible connections are merged with the existing cap structure, integrating tamper-evident functionality into the outer shell and inner shell assembly. This combining approach adds tamper evidence capability while minimizing the increase in overall device complexity by using the existing cap components as the foundation for the tamper-evident mechanism.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12570446B2Aerosol caps and methods of using the same

Publication Date: 2026.03.10 SILGAN DISPENSING SYSTEMS CORP

AI summary

An aerosol cap having tamper evident features that may be used to assist with the removal of the aerosol cap from an aerosol product includes one or more release tabs which may be forced inward of an outer shell of the aerosol cap to engage an interior shell to disengage the aerosol cap from an aerosol product, the movement of the release tabs visually evidencing tampering with, or removal of, the aerosol cap from the aerosol product.