Multi-Layer Food Wrap Laminate Oxygen Barrier
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Solution Overview
Problem
Current food wraps fail to effectively prevent the penetration of fluids and gases, such as oxygen, hydrogen sulfide, and sulfur dioxide, which can lead to food decay and spoilage, and often contain volatile corrosion inhibitors that are not FDA-approved for food contact.
Innovation Solution
A multi-layer laminate structure comprising a hydrophobic outer layer, a gas-resistant barrier layer with food-safe preservatives, and an optional tie layer, made from polymers like polyethylene and ethylene-vinyl alcohol copolymers, which provides synergistic protection against fluid and gas penetration without using volatile corrosion inhibitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard polyethylene films are used as food wraps, then the structure is simple and cost-effective, but the oxygen transmission rate is high leading to food spoilage
Solution Approach 1:
The food wrap is divided into multiple functional layers: an outer hydrophobic layer for water resistance, an inner hydrophilic layer for moisture absorption and oxygen barrier, and optional tie layers for bonding. This segmentation allows each layer to perform its specific function optimally, achieving superior overall preservation effectiveness.
Solution Approach 2:
The invention uses composite material construction by combining different polymer types with complementary properties - hydrophobic polymers (like polyethylene) for water resistance and hydrophilic polymers (like polyvinyl alcohol) for oxygen barrier and moisture absorption. This composite approach creates a laminate that outperforms single-material films in food preservation.
2Reliability
If volatile corrosion inhibitors are added to improve gas barrier properties, then gas resistance improves, but food safety is compromised due to FDA approval issues
Solution Approach 1:
The invention changes the chemical composition parameters of the laminate by using food-grade polymers with inherent barrier properties rather than adding volatile corrosion inhibitors. The hydrophilic polymer layer provides gas barrier performance through its molecular structure and crystallinity, eliminating the need for harmful additives while maintaining protection.
Solution Approach 2:
The invention converts the potential harm of needing enhanced gas barriers into a benefit by using food-safe hydrophilic polymers that naturally provide excellent oxygen and gas barrier properties. These polymers were originally designed for food contact safety, and their barrier performance is achieved through their molecular structure rather than through corrosive inhibitors.
3Reliability
If a multi-layer laminate structure is used to reduce fluid and gas penetration, then protection effectiveness improves, but manufacturing complexity increases
Solution Approach 1:
The laminate is segmented into distinct functional layers that can be manufactured separately and then bonded together. The outer hydrophobic layer and inner hydrophilic layer are produced as separate films before lamination, allowing each layer to be optimized for its specific function while simplifying the manufacturing process through modular production.
Solution Approach 2:
The invention uses tie layers as intermediaries between the outer and inner layers to ensure strong bonding. These tie layers are compatible with both polymer types and provide reliable adhesion, making the manufacturing process more straightforward despite the multiple layers, as they facilitate the lamination step.
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 laminate significantly reduces the transmission rates of oxygen, hydrogen sulfide, and other gases, extending the shelf life of food products while ensuring safety by avoiding harmful additives, with oxygen transmission rates reduced by over 5,000 times compared to standard polyethylene films.
Implementation Method 1
at least one hydrophobic outer layer
Implementation Method 2
at least one gas resistant barrier layer that can be a hydrophilic polymer
Implementation Method 3
The laminate when applied as a wrap to a food item provides synergistic protection against fluid penetration
Data Source
AI summary
An all-purpose plastic laminate or wrap as for preserving food that resists penetration of fluids such as water and gases such as oxygen, hydrogen sulfide, sulfur dioxide, and the like. The laminate includes many different embodiments such as at least one hydrophobic outer layer that is free of any volatile corrosion inhibitors, at least one gas resistant barrier layer that can be a hydrophilic polymer, and at least one hydrophobic inner layer that contains a desired additive such as a food safe preservative or antioxidant therein. Optionally at least one tie layer is located between the outer and/or inner layer and said fluid resistant barrier layer. The laminate when applied as a wrap to a food item provides synergistic protection against fluid penetration.