CPET Multilayer Oxygen-Scavenging Containers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current plastic packaging containers, particularly those made from crystalline poly(ethylene terephthalate) (CPET), face challenges with oxygen permeation and scavenging efficiency, including short or no induction period, wastage of oxygen scavengers during inventory, and increased costs due to thick sidewalls, which affect the shelf life and environmental sustainability of food and beverage packaging.
Innovation Solution
A multi-layer container design comprising an outer and inner layer of polymeric resin with a middle layer containing an oxygen-scavenging component and a catalyst-containing concentrate, allowing for controlled oxygen scavenging and extended incubation periods, thereby reducing oxygen permeation and optimizing the use of scavengers, without the need for external triggering agents like ultraviolet light or water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oxygen scavenging components are incorporated into PET containers to achieve zero or negative oxygen permeation, then the oxygen barrier performance is improved, but the container requires thick sidewalls which increases cost
Solution Approach 1:
The patent modifies the chemical composition parameters of the PET polymer itself by incorporating specific catalysts and additives during polymerization, changing the molecular structure to achieve inherent oxygen scavenging capability without requiring thick physical barriers
Solution Approach 2:
The invention creates a composite PET material system combining polymer chains with integrated oxygen scavenging functional groups and catalyst residues, forming a multi-functional material that provides both structural integrity and oxygen protection
2Productivity
If oxygen scavenging begins immediately upon container production, then oxygen absorption capacity is maximized, but the expensive oxygen scavenger is wasted during the inventory period before the container is filled
Solution Approach 1:
The oxygen scavenging system is pre-installed in the container during manufacturing but remains dormant until activated by the product itself (such as water from food or beverage), ensuring the scavenger is ready but not actively consuming oxygen during storage
Solution Approach 2:
The patent introduces a triggering mechanism or intermediary substance (such as moisture from the product) that acts as a switch to activate the oxygen scavenging function only when the container is actually used, preventing premature activation
3Object-affected harmful factors
If conventional oxygen scavenging containers are used, then some oxygen absorption occurs, but they have short or no induction period allowing ambient oxygen absorption during inventory
Solution Approach 1:
The container is prepared with oxygen scavenging components during manufacturing, but the system is designed to remain inactive during storage and only activate when the product is introduced, creating a controlled time delay
Solution Approach 2:
The patent modifies the activation parameters of the oxygen scavenging system by controlling the molecular structure and catalyst composition to require specific conditions (such as product moisture) for activation, thereby extending the induction period
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 multi-layer container achieves zero or negative oxygen permeation for over three years, reduces headspace oxygen effectively, and maximizes oxygen absorption capacity per gram of scavenger, enhancing the shelf life and cost-effectiveness of packaging while maintaining environmental sustainability.
Implementation Method 1
a middle layer including a blend of: i) at least one oxygen-scavenging component, and ii) at least one catalyst-containing concentrate
Data Source
AI summary
An oxygen-scavenging multi-layer container and methods of making, controlling, and using the same are disclosed.