Biodegradable Packaging with Nanocellulose Coating for Antimicrobial Release
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Solution Overview
Problem
Existing packaging materials fail to effectively inhibit the growth of microorganisms, fungi, and molds on food products both in direct contact and in the head space, and they lack eco-sustainability characteristics.
Innovation Solution
A multilayer sheet packaging material with a nanocellulose coating layer and a structural substrate made from biodegradable materials, which includes a layer for the release of antimicrobial and antifungal agents dispersed in a biodegradable polymeric material, providing prolonged and controlled release of active agents and improved mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional packaging materials are used, then manufacturing cost is low, but antimicrobial and antifungal effectiveness is insufficient
Solution Approach 1:
The patent applies composite materials by combining nanocellulose coating layer with biodegradable polymeric material containing antimicrobial and antifungal agents. This composite structure integrates the barrier properties of nanocellulose with the biocidal properties of the polymeric matrix, achieving enhanced antimicrobial effectiveness while maintaining manufacturability through coating processes.
Solution Approach 2:
The patent implements local quality by applying nanocellulose coating specifically to the surface layer (coating layer b) while the bulk material (layer a) contains dispersed antimicrobial agents. This localized functional distribution optimizes antimicrobial effectiveness at the food-contact surface while maintaining overall structural integrity and controlling manufacturing complexity.
2Reliability
If biodegradable polymeric materials with dispersed active agents are used, then eco-sustainability is improved, but controlled release capability is insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the physical and chemical parameters of the biodegradable polymeric material, including molecular weight, crystallinity, and cross-linking density, to control the release rate of antimicrobial agents. The nanocellulose coating further modulates release kinetics through its barrier properties, achieving prolonged controlled release without complex mechanical release mechanisms.
Solution Approach 2:
The nanocellulose coating acts as an intermediary layer between the biodegradable polymeric material containing active agents and the external environment (food product and head space). This intermediary controls the diffusion and release rate of antimicrobial agents, enabling prolonged controlled release while simplifying the overall release mechanism.
3Reliability
If nanocellulose coating layer is applied, then barrier properties are improved, but manufacturing process complexity increases
Solution Approach 1:
The patent employs thin film technology by applying a nanocellulose coating layer (coating layer b) with thickness optimized to provide effective barrier properties against oxygen and water vapor. This thin film approach achieves improved barrier performance while minimizing coating process complexity and maintaining manufacturability through standard coating techniques.
4Duration of action of moving object
If multiple layers are combined for prolonged release, then duration of action is improved, but structural complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the packaging material into distinct functional layers: layer a (biodegradable polymeric material with dispersed antimicrobial and antifungal agents) and coating layer b (nanocellulose coating). This segmentation enables prolonged controlled release through the combined action of bulk diffusion and surface barrier control, while keeping the multilayer structure simple and manufacturable.
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 packaging material effectively inhibits microbial growth, extends the shelf life of food products, and offers improved eco-sustainability by using biodegradable components and a nanocellulose coating that enhances biocidal properties and barrier properties against oxygen and water vapor.
Implementation Method 1
a nanocellulose coating layer (coating layer b) comprising or consisting of nanocellulose... barrier properties against oxygen and water vapor
Implementation Method 2
comprising said active agent dispersed or dissolved in a biodegradable polymeric material which releases it in the vapor or gas state
Data Source
AI summary
A packaging material with a multi-layer structure including at least one layer for the release of an active agent with anti-microbial and/or anti-fungal activity, including the active agent in a biodegradable material, which allows its release in gas or vapor state and at least one coating layer including nanocellulose. The packaging material may include a structural substrate selected from cellulose, starch-based material, polyhydroxyalkanoate or a polybutylene succinate polymer. The packaging material may further include a coating layer with oxygen scavenging properties and a gas-barrier layer.