Food Package Wrapper Line of Weakness for Stress Concentration
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Solution Overview
Problem
Existing food packaging designs do not efficiently facilitate easy opening, especially for mobile consumption, as they require manual effort without utilizing the food product itself to initiate the opening process.
Innovation Solution
A package design featuring a flexible wrapper with a line of weakness aligned with the food product's edge or corner profile, creating stress concentrations that facilitate tearing or rupturing when pulled, allowing for easy opening and exposure of the food product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional sealed wrapper is used to enclose the food product, then the package maintains structural integrity and protection, but the package requires manual effort to open and does not facilitate easy access to the food product
Solution Approach 1:
The line of weakness is pre-formed in the wrapper during manufacturing, creating a predetermined path for tearing. This preliminary structural feature enables easy opening by concentrating stress along a specific line when the wrapper is pulled, resolving the contradiction between maintaining structural integrity during transport and enabling easy opening during use.
Solution Approach 2:
The wrapper has non-uniform structural properties: a strong sealed portion for maintaining integrity during transport and a weakened line portion for easy tearing during opening. This local variation in quality allows the wrapper to provide both protection and ease of opening, resolving the contradiction between strength and ease of operation.
2Force
If the line of weakness is positioned below the upper profile of the food product, then the wrapper maintains strength, but stress concentrations are not effectively created when pulled against the food product
Solution Approach 1:
The line of weakness is strategically positioned at a specific location on the wrapper where it can effectively interact with the food product's upper profile. This localized positioning ensures that when the wrapper is pulled, the food product's corners or edges directly contact the line of weakness to create stress concentrations, optimizing the force application while maintaining overall wrapper strength.
3Ease of operation
If the line of weakness is aligned with the upper profile of the food product, then stress concentrations are created to facilitate tearing, but the wrapper may be more difficult to seal properly
Solution Approach 1:
The wrapper structure is segmented into distinct functional zones: sealed portions for maintaining integrity during manufacturing and transport, and a line of weakness portion for easy opening. The line of weakness is positioned to extend between sealed areas, allowing proper sealing in manufacturing while enabling easy tearing during use, thus resolving the contradiction between ease of opening and ease of manufacture.
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
Enables convenient opening of food packages by leveraging the food product's profile to create stress concentrations, making it easier to access the food without manual effort, particularly suitable for on-the-go consumption.
Implementation Method 1
when the wrapper is pulled against the food product one or more stress concentrations is created along the line of weakness due to the profile of the food product
Data Source
AI summary
A package containing a food product is provided where the package is configured to facilitate opening by using the food product to initiate opening of the packages. The package includes an outer wrapper with a line of weakness that is generally aligned with or above an upper profile of the food product such that when the wrapper is pulled against the food product one or more stress concentrations is created along the line of weakness due to the profile of the food product, whether in direct or near direct contact with the line of weakness of by the food product spacing front and rear walls of the wrapper apart during opening. The stress concentrations facilitate initiation of tearing or rupturing along the line of weakness such that a portion of the package can be completely or at least partially removed to expose at least a portion of the food product.