Consumer Goods Packaging With Two-Stage Access-Controlled Opening
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Solution Overview
Problem
Existing packaging for consumer goods does not adequately differentiate between adult and non-adult users, making it difficult to design an intuitive opening mechanism that is accessible to adults while preventing access by children.
Innovation Solution
A packaging design featuring a first line of weakness for deformation and a second line of weakness with a stress concentrating feature that requires a two-stage manipulation to open, ensuring the package is easily opened by adults but challenging for children.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the packaging is designed with a simple opening mechanism, then it is easy for adult users to open, but it becomes too easy for non-adult users to open as well
Solution Approach 1:
The opening mechanism is segmented into two distinct stages: first deforming the packaging along the first line of weakness, then rupturing the second line of weakness to expose the stress concentrating feature. This segmentation creates different operational complexities that differentiate between adult and non-adult users.
Solution Approach 2:
The packaging requires a preliminary deformation action along the first line of weakness before the second line of weakness can be ruptured. This preliminary action must be performed correctly to expose the stress concentrating feature, creating a knowledge-based barrier that prevents accidental or unauthorized opening by non-adults.
2Reliability
If the packaging includes a two-stage opening mechanism with stress concentrating features, then it prevents non-adult access, but it becomes more complex for adult users to understand and execute
Solution Approach 1:
The stress concentrating feature is created through localized geometric modifications (notches, holes, or protrusions) at specific positions on the second line of weakness. These local features concentrate stress during deformation, enabling controlled rupture and tear initiation without requiring complex overall structural changes.
Solution Approach 2:
The stress concentrating features utilize curved or rounded geometries (notches, holes, protrusions) rather than sharp corners. This curvature helps distribute and concentrate stress in predictable patterns during deformation, making the rupture process more controllable and the tear initiation more reliable while maintaining visual simplicity.
3Ease of operation
If the second line of weakness is shaped to define stress concentrating features, then tear initiation is facilitated, but the manufacturing precision requirements increase
Solution Approach 1:
The stress concentrating features are created by modifying the geometric parameters of the second line of weakness, such as introducing notches, holes, or protrusions with specific dimensions and positions. These parameter changes enable controlled stress concentration during deformation, facilitating reliable tear initiation while using standard manufacturing tolerances.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The packaging provides a secure and intuitive opening mechanism that is accessible to adults while deterring non-adults, enhancing safety and usability.
Implementation Method 1
the second line of weakness is shaped to define at least one stress concentrating feature; and wherein the at least one stress concentrating feature is configured to be exposed by rupturing of the second line of weakness to enable a tear in the sheet material to be initiated
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
A package for housing an article, the packaging comprising sheet material shaped to form an enclosed cavity for housing the article; wherein an outer surface of the sheet material comprises a first line of weakness along or around which the sheet material is configured to be deformed by a user, and a second line of weakness configured to rupture when the sheet material is deformed along or around the first line of weakness; wherein the second line of weakness is shaped to define at least one stress concentrating feature; and wherein the at least one stress concentrating feature is configured to be exposed by rupturing of the second line of weakness to enable a tear in the sheet material to be initiated by a user to form an extraction opening for removal of the article housed in the enclosed cavity.