Microfibrillated Cellulose Fibre Processing for High Mineral Loading
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Solution Overview
Problem
Current methods for manufacturing fibres and non-woven materials using microfibrillated cellulose face challenges in achieving high tensile strength and mineral loading while maintaining cost-effectiveness and sustainability, with existing processes often compromising on elastic modulus and temperature resistance.
Innovation Solution
A two-stage processing method involving grinding and refining or homogenization of cellulose in the presence of a grinding medium, followed by optional co-processing with inorganic particulate materials and water-soluble polymers, to produce microfibrillated cellulose fibres with enhanced tensile strength and mineral loading, suitable for extrusion and non-woven material production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If microfibrillated cellulose is used to reduce component usage and cost, then cost is reduced, but physical, mechanical and optical requirements may deteriorate
Solution Approach 1:
The patent applies parameter changes by controlling the fibre steepness of microfibrillated cellulose within a specific range (10-100, preferably 20-50) and optimizing the particle size distribution through two-stage processing. These parameter optimizations ensure that cost reduction through microfibrillated cellulose substitution does not compromise the physical, mechanical, and optical requirements of the final product.
Solution Approach 2:
The patent creates composite materials by combining microfibrillated cellulose with inorganic particulate materials and water-soluble or dispersible polymers. This composite approach allows cost reduction while maintaining or improving physical, mechanical, and optical properties through synergistic material combinations.
2Quantity of substance
If microfibrillated cellulose loading is increased, then mineral loading is improved, but processing complexity increases
Solution Approach 1:
The patent applies preliminary action through a two-stage processing method where microfibrillated cellulose is first prepared with controlled fibre steepness and particle size distribution before being combined with inorganic particulate materials. This pre-processing step simplifies subsequent manufacturing operations and enables higher mineral loading without proportionally increasing overall processing complexity.
3Strength
If fibre steepness is increased to improve tensile strength, then elastic modulus improves, but manufacturing complexity increases
Solution Approach 1:
The patent optimizes the fibre steepness parameter within a specific range (10-100, preferably 20-50) to achieve improved tensile strength and elastic modulus. This controlled parameter change approach allows enhancement of mechanical properties while avoiding excessive manufacturing complexity by staying within optimized parameter boundaries.
Solution Approach 2:
The patent applies partial action by achieving sufficient tensile strength and elastic modulus improvement through moderate fibre steepness optimization rather than extreme values. This balanced approach provides adequate mechanical property enhancement without the disproportionate manufacturing complexity that would result from excessive fibre steepness.
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 method achieves higher tensile strength, improved elastic modulus, and increased mineral loading in fibres, enabling the production of sustainable, biodegradable non-woven materials with enhanced temperature resistance and water-based processing.
Implementation Method 1
sonification with an ultrasonic device resulting in microfibrillated cellulose having a median diameter (d50) less than 100 μm, an increased percentage of material finer than 25 μm
Implementation Method 2
dried by an attenuating gas, such as one or more streams of hot air, and collected as fibres
Data Source
AI summary
Fibres and nonwoven materials comprising microfibrillated cellulose, and optionally inorganic particulate material and/or additional additives, and optionally a water soluble or dispersible polymer. Nonwoven materials made from fibres comprising microfibrillated cellulose, and optionally inorganic particulate material and/or a water soluble or dispersible polymer.