Multilayer Packaging with Antioxidant Adhesive
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Solution Overview
Problem
Current packaging methods fail to effectively prevent oxidation of air-sensitive materials due to residual air trapped within containers, leading to degradation and loss of organoleptic properties, and existing solutions like vacuum or inert gas flushing are costly and inefficient.
Innovation Solution
A multilayer assembly comprising a paper or polymeric layer, a polyurethane adhesive layer with catechin, and a metallic or polymeric layer, where the adhesive layer binds the paper or polymeric layer to the metallic or polymeric layer, providing antiradical/antioxidant properties without altering the adhesive's chemical and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vacuum or inert gas flushing is used to remove residual air, then oxygen removal efficiency is improved, but volatile compounds are lost and process complexity increases
Solution Approach 1:
The patent extracts only the harmful oxygen from the residual air while leaving the beneficial volatile compounds intact, by incorporating oxygen-absorbing materials directly into the packaging structure rather than using aggressive vacuum or flushing methods that remove all gases including desirable volatiles
Solution Approach 2:
The patent introduces oxygen-absorbing materials (such as iron powder, ascorbic acid, or other antioxidants) as intermediary substances within the packaging layers that selectively react with and remove oxygen through controlled chemical reactions, thereby protecting the packaged goods without requiring external vacuum or gas flushing equipment
2Reliability
If vacuum or inert gas flushing is used to remove residual air, then oxygen removal efficiency is improved, but process cost and duration increase
Solution Approach 1:
The packaging structure performs oxygen removal automatically through self-contained oxygen-absorbing materials integrated into the layers, eliminating the need for external vacuum pumps, gas flushing systems, or complex sealing equipment, thereby simplifying the overall packaging process while maintaining effective oxygen removal
Solution Approach 2:
The patent employs composite packaging structures combining multiple functional layers including oxygen-barrier resins (ethylene-vinyl alcohol copolymer, polyamide), oxygen-absorbing materials, and sealing layers, where each layer contributes a specific function to achieve comprehensive oxygen removal and barrier protection without requiring complex external equipment
3Ease of manufacture
If conventional packaging materials are used, then manufacturing simplicity is maintained, but oxidation protection against trapped air is insufficient
Solution Approach 1:
The patent combines multiple materials with complementary functions including oxygen-barrier resins (ethylene-vinyl alcohol copolymer or polyamide), oxygen-absorbing materials (iron powder, ascorbic acid, catechin), and sealing polymers (polyethylene, polypropylene) into a multi-layer composite structure that provides both oxidation protection and ease of manufacture through standardized lamination processes
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 multilayer assembly significantly reduces or eliminates oxidative degradation of packaged materials, maintaining their organoleptic properties and extending shelf-life without releasing catechins into the contents, thus being cost-effective and simple to implement.
Implementation Method 1
the adhesive layer b) binds layer a) to layer c) and comprises a mixture of at least a catechin and a polymeric adhesive composition, wherein the mixture of at least a catechin and a polymeric adhesive composition has antiradical/antioxidant properties
Data Source
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AI summary
The present invention provides a multilayer assembly comprising an antioxidant substance, a container comprising said assembly, its use and a method for its production.