Cellulosic Container with Metal Oxide Barrier Layer
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Solution Overview
Problem
Conventional paper-based containers lack recyclability while maintaining effective barrier properties against oxygen, moisture, and light penetration, which leads to product degradation, especially for foodstuffs.
Innovation Solution
A cellulosic structure comprising a cellulosic board substrate with a metal oxide layer and a tie layer, which provides a high barrier against oxygen and moisture without compromising recyclability by reducing light penetration, eliminating the need for metallic barrier layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metallic barrier layers are incorporated into paperboard blanks, then barrier properties against oxygen, moisture and light are improved, but recyclability deteriorates
Solution Approach 1:
The patent removes metallic barrier layers from the container structure and replaces them with an alternative barrier system using cellulosic board with embedded barrier agents (clay, wax, resin) and coating layers. This extraction of metal eliminates the recyclability problem while maintaining barrier functionality through the cellulosic-based barrier system.
Solution Approach 2:
The patent creates a composite structure consisting of cellulosic board substrate combined with barrier agents (clay particles, wax, resin) and coating layers (polymer, metal oxide). This composite material provides effective barrier properties against oxygen, moisture and light while remaining compatible with recycling processes, as all components are non-metallic and can be processed together.
2Adaptability or versatility
If conventional paperboard is used without metallic layers, then recyclability is maintained, but barrier properties against oxygen, moisture and light deteriorate
Solution Approach 1:
The patent applies barrier agents and coating layers selectively to specific regions and surfaces of the cellulosic board where barrier protection is most needed (inner surfaces facing contents, areas prone to penetration). This localized application provides enhanced barrier properties exactly where required while maintaining overall recyclability of the container structure.
Solution Approach 2:
The patent modifies the physical and chemical parameters of the cellulosic board by incorporating barrier agents (clay, wax, resin) and applying coating layers, thereby changing its permeability, hydrophobicity and light transmission properties. These parameter changes enable the board to achieve barrier-level performance without metal, while remaining recyclable.
3Adaptability or versatility
If cellulosic board substrate alone is used, then recyclability is maintained, but light penetration increases leading to product degradation
Solution Approach 1:
The patent introduces coating layers containing metal oxides (aluminum oxide, silicon oxide) and barrier agents as intermediary elements between the cellulosic board and the external environment. These intermediary layers specifically block light penetration and protect the contents from light-induced degradation, while the overall structure remains recyclable as all components are non-metallic.
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 solution effectively reduces light, oxygen, and moisture transmission, extending the shelf life of contents while maintaining recyclability by using a cellulosic structure with a metal oxide layer and a tie layer, thus addressing the limitations of conventional paper-based containers.
Implementation Method 1
a metal oxide layer positioned over the cellulosic board substrate
Implementation Method 2
provides a high barrier against oxygen and moisture without compromising recyclability by reducing light penetration
Implementation Method 3
a tie layer between the cellulosic board substrate and the metal oxide layer
Data Source
AI summary
A cellulosic structure including a cellulosic board substrate, a metal oxide layer positioned over the cellulosic board substrate, and a tie layer between the cellulosic board substrate and the metal oxide layer.