Cross-linked Cellulose Packaging via Citric Acid Esterification
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Solution Overview
Problem
There is a need for packaging materials that are recyclable, provide a barrier against oxygen and moisture, and are made from entirely sustainable components, while also offering improved strength and biodegradability.
Innovation Solution
A process involving the use of cellulose-containing parenchymal microparticulate plant material, which involves suspending cellulose-containing parenchymal plant material in an aqueous solution, mixing it with wood pulp, and reacting with linker compounds and esterification catalysts to create a cross-linked material with enhanced strength and biodegradability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If packaging materials are made from sustainable components with improved strength and biodegradability, then environmental performance is improved, but barrier properties against oxygen and moisture may deteriorate
Solution Approach 1:
The patent applies composite materials by combining cross-linked cellulosic fibres with specific polymers and waxes to create a multi-component structure. The cross-linked cellulose provides structural integrity and biodegradability, while the polymer matrix and wax layers contribute barrier properties against oxygen and moisture, achieving both environmental performance and protective functionality.
Solution Approach 2:
The patent utilizes parameter changes by controlling the degree of cross-linking, polymer composition, and wax content to optimize both barrier properties and biodegradability. By adjusting these parameters, the material achieves sufficient protection against oxygen and moisture while maintaining its ability to degrade environmentally at end-of-life.
2Object-affected harmful factors
If packaging materials use metal layers for barrier properties, then oxygen and moisture protection is improved, but recyclability deteriorates due to difficulty in separating plastic coating from paper and metal
Solution Approach 1:
The patent extracts the metal layer from the packaging structure and replaces it with organic-based barrier layers comprising polymers and waxes applied to cross-linked cellulosic fibres. This extraction eliminates the recycling complexity associated with separating metal, plastic, and paper layers, while maintaining effective barrier properties through the organic composite structure.
3Reliability
If packaging materials are made lighter for improved recyclability, then environmental sustainability is improved, but strength may deteriorate
Solution Approach 1:
The patent employs composite materials where cross-linked cellulosic fibres provide structural strength and light weight, while the polymer matrix and wax components contribute to both mechanical properties and barrier functionality. This composite approach achieves adequate strength in a lighter structure that is easier to recycle, eliminating the need for heavy metal layers.
Solution Approach 2:
The patent utilizes spherical or microparticulate wax structures dispersed within the polymer matrix. These spherical wax particles provide reinforcement to the composite material, enhancing mechanical strength while maintaining light weight. The curved, particulate structure of the wax spheres contributes to the overall structural integrity without adding significant mass.
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 resulting material exhibits twice the strength of comparable cross-linked materials without parenchymal plant material, allowing for lighter packaging and improved recyclability, while maintaining a high level of biodegradability and barrier properties.
Implementation Method 1
U.S. Pat. No. 5,190,563 describes a method of intra-molecularly cross-linking wood pulp cellulosic fibres, that is linking cellulosic fibres to themselves, using polycarboxylic acids, such as citric acid.
Implementation Method 2
The materials are subjected to a homogenisation step, followed by a peroxide treatment step, a washing step, a drying step and a granulation step.
Data Source
AI summary
The present invention relates to preparing a biodegradable and reusable cellulose comprising cellulose fibres and material from other plant fibres. The invention also relates to a material obtainable from such a process and the use of such a material to improve the properties of articles comprising such material.