NCC Coating on BOPP Films for Oxygen Barrier
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Solution Overview
Problem
Current packaging materials face challenges in providing effective barriers against gases, moisture, and other external agents, particularly in maintaining the freshness and shelf-life of food products, as they are prone to degradation and have limited gas barrier properties.
Innovation Solution
A thin layer of nanocrystalline cellulose (NCC) coating is applied to plastic films, such as BOPP, which significantly reduces oxygen transmission rates and enhances barrier properties, offering a bio-based, recyclable alternative to existing materials like PVdC, and can be applied using in-line roll-to-roll methods for increased productivity and reduced energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional packaging materials are used, then they provide basic protection, but they have limited gas barrier properties and are prone to degradation
Solution Approach 1:
The patent applies composite materials by combining nanocrystalline cellulose (NCC) with plastic films to create a multi-layer structure. The NCC layer provides superior oxygen and gas barrier properties while the plastic film provides structural support, achieving both improved reliability and extended shelf-life through synergistic material combination.
Solution Approach 2:
The patent uses thin NCC films as flexible barrier coatings on packaging materials. These thin films provide effective gas and moisture barriers while maintaining flexibility and conformability to the underlying substrate, enabling improved protection without significant increases in packaging thickness.
2Reliability
If traditional barrier materials like PVdC are used, then they provide good barrier properties, but they are complex to apply and have high degradability
Solution Approach 1:
The NCC coating process is designed to be self-service friendly, allowing for straightforward application to substrates. The slurry formulation and coating methodology enable easy manufacturing integration with minimal complex equipment or procedures, improving ease of manufacture while maintaining effective barrier properties.
3Reliability
If NCC coating is applied to plastic films, then oxygen transmission rate is significantly reduced, but the coating process requires optimization for productivity
Solution Approach 1:
The patent implements continuous coating processes where NCC slurry is continuously applied to moving plastic film substrates in roll-to-roll configurations. This continuous operation maintains uninterrupted coating action, optimizing productivity while ensuring consistent oxygen barrier properties across the entire packaging material surface.
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 NCC coating effectively reduces oxygen and other agent permeability, extending the shelf-life of food products by creating a robust, self-reinforced barrier that is both mechanically strong and environmentally friendly, while being easier to apply and less degradable than traditional materials.
Implementation Method 1
NCC films and coating materials may be used to reduce the permeability of materials to gases and vapors, and for modifying the surface properties of a material
Implementation Method 2
Xyloglucan associates with cellulose microfibrils via hydrogen bonds, forming a cellulose-xyloglucan network
Data Source
Figure 1~2
Figure 3A~3B
Figure 3C~4A
AI summary
Provided are NCC-based materials, as superb barrier materials for preventing oxygen and humidity from penetrating therethrough.