Alcohol-Resistant Reclosure Label with MDO Film Barrier
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Solution Overview
Problem
Existing reclosure sealing labels fail to maintain adhesion and integrity when used on packages with high alcohol content products, leading to improper seals and product degradation due to alcohol corrosion, which reduces the bond strength and requires frequent reclosures.
Innovation Solution
A layered article comprising a biaxially oriented polymeric facestock, a reclosure adhesive, and a machine direction oriented (MDO) film with cut-outs that tear in the machine direction upon peeling, providing a tamper-evident feature and maintaining adhesive strength despite high alcohol content, allowing for multiple reclosures without significant degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a typical reclosure sealing label is used for high alcohol content products, then the label structure is simple and easy to manufacture, but the adhesive bond strength decreases due to alcohol corrosion
Solution Approach 1:
The patent introduces an alcohol-resistant adhesive layer as an intermediary between the typical reclosure adhesive and the high alcohol content product. This intermediary layer protects the reclosure adhesive from direct contact with alcohol, preventing corrosion and maintaining bond strength over multiple reclosures.
Solution Approach 2:
The sealing label is constructed as a composite structure with multiple adhesive layers having different functional properties. The combination of typical reclosure adhesive and alcohol-resistant adhesive creates a composite system that provides both removability/resealability and resistance to alcohol degradation.
2Duration of action of moving object
If the adhesive is in proximity to high alcohol content contents for extended periods, then reclosure capability increases, but adhesion resistance to degradation decreases
Solution Approach 1:
The alcohol-resistant adhesive acts as a protective intermediary that allows the reclosure adhesive to remain in proximity to the product for extended periods without degrading. This enables multiple reclosures while maintaining reliable adhesion.
Solution Approach 2:
The patent changes the chemical parameters of the adhesive system by introducing an alcohol-resistant adhesive with different compositional properties. This parameter change allows the adhesive system to withstand prolonged exposure to high alcohol content environments.
3Loss of substance
If alcohol evaporates from the product, then the product concentration changes, but adhesive functional components migrate away from the interface
Solution Approach 1:
The alcohol-resistant adhesive layer serves as a stable intermediary that prevents functional components from migrating away during alcohol evaporation. This intermediary layer maintains adhesive integrity and bonding strength even as product concentration changes.
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 solution provides a strong, durable seal for high alcohol content products, maintaining product integrity and preventing alcohol-induced degradation, enabling 50 to 150 reclosures while minimizing the risk of packaging failure during transportation and storage.
Implementation Method 1
at least one cut-out at a periphery of the film that is in line with a machine direction of the film... peeling the layered article from the package causes the film to tear from the at least one cut-out, in the machine direction of the film
Data Source
Figure 1
Figure 2
Figure 3~6
AI summary
A container (33) for a high alcohol content product comprises a package (32) which has an opening (22) sealed by a layered article (1), the layered article has a facestock (4), a reclosure adhesive (5), a machine direction oriented film (6) and a sealing adhesive (7) which has an adhesive strength that is not significantly diminished by the product. The sealing adhesive (7) provides a good long-term seal for the package that is resistant to degradation from alcohol. The machine direction oriented film (6) provides an alcohol barrier between the product and the reclosure adhesive (5). Upon opening, the film tears clean and straight in the machine direction to allow a portion of the film to stay in contact with the package and another portion of the film to be pulled from the package (32) to expose the opening (22). The reclosure adhesive provides resealing capabilities for the layer article after the initial opening of the package. The clean straight tear also provides a temper evident feature for the package.