Parchment Barrier Paper Coating for Oxygen Barrier Without Brittleness
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Solution Overview
Problem
Existing biodegradable parchment papers with high parchmentization for oxygen barrier properties suffer from mechanical fragility, require specialized and costly manufacturing processes, and generate significant waste, while additional coatings like PVOH and polyolefin laminations compromise sustainability and efficiency.
Innovation Solution
A non-continuous coating of water-soluble and water-dispersible polymers is applied to a parchment paper base material, which improves oxygen barrier properties and mechanical strength without increasing brittleness, using a parchment paper with a lower parchmentization level to reduce production energy and waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the parchment paper is highly parchmentized to achieve oxygen barrier properties, then the oxygen barrier properties are improved, but the mechanical properties deteriorate (the paper becomes more brittle and fragile)
Solution Approach 1:
The invention combines parchment paper with a polymer coating layer to create a composite material that achieves oxygen barrier properties without requiring the parchment paper itself to be highly parchmentized. The polymer coating provides the oxygen barrier function while the parchment paper base maintains mechanical strength and flexibility.
Solution Approach 2:
The oxygen barrier function is localized to the polymer coating layer applied on the surface of the parchment paper, rather than requiring the entire parchment paper structure to be highly transformed. This allows the bulk parchment paper to maintain its mechanical properties while only the surface layer provides oxygen barrier functionality.
2Reliability
If the parchment paper is highly parchmentized to achieve oxygen barrier properties, then the oxygen barrier properties are improved, but the production efficiency deteriorates (high amount of waste and low production efficiency)
Solution Approach 1:
The oxygen barrier function is applied as a preliminary coating layer on the parchment paper surface, rather than requiring the parchment paper to undergo extensive parchmentization processing. This preliminary action of coating achieves the oxygen barrier property without the need for high-level parchmentization, thereby improving production efficiency and reducing waste.
3Reliability
If additional oxygen barrier coatings such as PVOH are applied, then the oxygen barrier properties are improved, but the sustainability deteriorates (coating sensitivity to moisture and environmental concerns)
Solution Approach 1:
The invention changes the parameters of the coating material to use polymers with improved sustainability characteristics compared to traditional PVOH coatings. The selected polymers exhibit reduced sensitivity to moisture and improved environmental profile while maintaining oxygen barrier functionality.
4Reliability
If polyolefin lamination is used to achieve oxygen barrier properties, then the oxygen barrier properties are improved, but the bio-sourced content deteriorates (negative impact on life cycle and sustainability)
Solution Approach 1:
The invention changes the material composition parameters by selecting polymer coatings with higher bio-sourced content compared to conventional polyolefin laminations. This substitution maintains the oxygen barrier function while improving the bio-sourced content and sustainability profile of the packaging material.
Data Source
AI summary
This invention relates to a barrier paper comprising a parchment paper base material and a non-continuous coating formed on a surface thereof, wherein the non-continuous coating is made of at least one of a water-soluble polymer and a water-dispersible polymer.