Cellulose Multilayer Food Packaging Barrier
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Solution Overview
Problem
Current food packaging materials, particularly laminates, are not biodegradable and recyclable due to the use of non-renewable materials like plastics and metals, leading to environmental issues and difficulties in recycling, as they are often treated as unsorted waste.
Innovation Solution
A multilayer material composed of a cellulose-based substrate bonded with a regenerated cellulose layer using a water-based vinyl polymer adhesive and a water barrier coating, allowing for biodegradability and recyclability without the need for harmful adhesives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional plastic and metal laminates are used for food packaging, then barrier properties and durability are improved, but biodegradability and recyclability deteriorate
Solution Approach 1:
The patent changes the material parameters from conventional plastics and metals to cellulose-based materials with specific properties (degree of polymerization, crystallinity) to achieve both barrier performance and biodegradability. The regenerated cellulose layer provides water and oxygen barrier properties while maintaining biodegradability, resolving the contradiction between reliability and environmental harm.
Solution Approach 2:
The patent creates a composite structure with multiple layers: paper substrate, regenerated cellulose barrier layer, and optional coating layers. This composite approach combines the advantages of different materials - the mechanical strength of paper with the barrier properties of regenerated cellulose - to achieve both protection and environmental compatibility.
2Object-generated harmful factors
If paper substrate is used directly for food contact, then biodegradability is improved, but migration of toxic substances occurs
Solution Approach 1:
The regenerated cellulose layer acts as an intermediary barrier between the paper substrate and foodstuffs. It prevents direct contact between food and potentially harmful substances in the paper (such as lignin or processing chemicals) while maintaining the biodegradable nature of the overall structure. This mediator layer solves the contradiction between biodegradability and toxic migration.
Solution Approach 2:
The patent modifies the paper substrate by coating it with regenerated cellulose, changing its surface properties and chemical composition. This creates a food-safe interface while preserving the underlying paper's biodegradability, thus resolving the contradiction between biodegradability and toxic substance migration.
3Object-generated harmful factors
If water-based adhesives are used to bond cellulose layers, then environmental friendliness is improved, but bonding strength deteriorates
Solution Approach 1:
The patent uses adhesives that are applied and then have the water content removed through drying or heating, allowing the adhesive to bond the layers together. This self-drying mechanism enables water-based adhesives to achieve sufficient bonding strength without requiring solvents or additional processing chemicals, resolving the contradiction between environmental friendliness and bonding strength.
4Ease of manufacture
If regenerated cellulose is made water-soluble for processing, then ease of manufacture is improved, but water barrier properties deteriorate
Solution Approach 1:
The patent carefully controls the degree of polymerization and crystallinity of the regenerated cellulose to achieve the right balance between water solubility for processing and water barrier properties for the final product. By optimizing these parameters, the cellulose can be processed effectively while maintaining the necessary barrier functionality.
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 results in a completely biodegradable and recyclable food packaging material that prevents the migration of toxic substances from the paper substrate, meeting regulatory standards and enabling effective food protection while being environmentally friendly.
Implementation Method 1
a water-based adhesive which is a suspension or emulsion of a vinyl polymer
Implementation Method 2
a water-based adhesive which is a suspension or emulsion of a vinyl polymer
Implementation Method 3
at least one layer of a material having the function of a barrier to the penetration of water
Data Source
Figure 1~2
AI summary
Multilayer material comprising a paper substrate on which at least one regenerated cellulose layer is applied, wherein the bonding between the paper substrate and the regenerated cellulose layer is achieved by means of a water-based adhesive and the regenerated cellulose layer comprises, as a surface coating, at least one layer of a material having the function of a barrier to the penetration of water. The resulting multilayer essentially consists only of materials based on cellulose or derivatives thereof, so it is suitable for manufacturing completely biodegradable disposable articles that can be collected separately as paper and recycled.