Mouldable Cellulosic Fibre Production via Mechanical Refining
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Solution Overview
Problem
The production of paper from wood requires high energy inputs, large volumes of water, and generates significant waste, while pulping processes struggle to control fibre geometry and interfacial bonding, making it inefficient and environmentally challenging. Additionally, alternative fibre sources like banana plant pseudostems are difficult to process due to high water and latex content, leading to low yield and economic inefficiencies.
Innovation Solution
A method for producing a mouldable cellulosic fibrous material from banana plant petioles with a moisture content greater than 80% involves mechanical pre-treatment to achieve uniform fibre lengths, dewatering without chemical additives, and refining in disc refiners to remove non-cellulosic components, resulting in a product suitable for vacuum moulding without the need for heat or chemical processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional pulping processes are used to produce paper from wood, then paper production is achieved, but energy consumption is high and water usage is large
Solution Approach 1:
The patent replaces conventional chemical pulping processes with a mechanical processing system that uses a disc refiner to mechanically separate and process fibre material. This mechanical approach eliminates the need for high-energy chemical pulping while achieving effective fibre separation and preparation, directly addressing the high energy consumption issue of traditional wood pulping processes.
Solution Approach 2:
The patent changes the processing parameters by operating with high moisture content feedstock (60-90% moisture) and using mechanical force rather than chemical agents. This parameter change allows the system to process alternative fibres like banana pseudostems that would be difficult to process chemically, while reducing overall energy and chemical consumption.
2Quantity of substance
If conventional pulping processes are used, then paper production is achieved, but water consumption is high and waste generation is significant
Solution Approach 1:
The mechanical disc refiner system replaces chemical pulping processes that generate significant waste. The mechanical separation process efficiently recovers fibre material with minimal loss, and the system's ability to process high-moisture feedstock directly reduces water consumption compared to conventional wet pulping processes.
Solution Approach 2:
The system recovers and reuses the high-moisture fibre material as feedstock for the disc refiner, minimizing waste generation. The process design allows for continuous processing of alternative fibres that would otherwise be discarded, converting waste materials into useful fibre products.
3Quantity of substance
If chemical pulping processes are used, then fibre separation is achieved, but control over fibre geometry and interfacial bonding is insufficient
Solution Approach 1:
The disc refiner provides precise mechanical control over fibre geometry through adjustable refining parameters. The mechanical action allows for controlled fibre separation while maintaining geometry control, overcoming the precision limitations of chemical pulping processes.
Solution Approach 2:
The system uses mechanical parameters (refining pressure, disc gap, rotation speed) that can be precisely controlled to achieve desired fibre geometry and interfacial bonding characteristics, providing manufacturing precision that chemical processes cannot match.
4Adaptability or versatility
If banana plant pseudostems are processed using traditional methods, then alternative fibre utilization is achieved, but processing difficulty increases due to high water and latex content
Solution Approach 1:
The patent specifically addresses the high moisture content challenge by designing the process to accept feedstock with 60-90% moisture. This parameter change allows banana pseudostems to be processed directly without preliminary drying, eliminating the processing difficulty associated with their high water content while enabling alternative fibre utilization.
Solution Approach 2:
The mechanical disc refiner system handles the latex and moisture content issues through mechanical separation, effectively processing alternative fibres like banana pseudostems that would be difficult to process chemically. The mechanical approach provides ease of manufacture for alternative fibre sources.
5Manufacturing precision
If mechanical pre-treatment is applied to achieve uniform fibre lengths, then fibre geometry control is improved, but processing time increases
Solution Approach 1:
The mechanical pre-treatment step performs preliminary fibre length control before the main refining process. This preliminary action ensures uniform fibre lengths are achieved early in the process, improving manufacturing precision while the subsequent refining steps complete the fibre preparation efficiently.
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
This method produces a mouldable cellulosic fibrous material with improved physical and mechanical properties, allowing for controlled fibre length and surface roughness, reducing waste and energy consumption, and enabling the use of banana plant pseudostems as a sustainable alternative to wood in packaging applications.
Implementation Method 1
refining the cellulose fibre cake in at least one disc refiner to produce the mouldable cellulosic fibrous material
Data Source
AI summary
The invention relates to a method for producing a mouldable cellulosic fibrous material from a cellulose fibre feedstock, the feedstock having a moisture content greater than about 95% (w/w). The method includes the mechanical pre-treatment of the feedstock to form a fibre furnish, the fibre furnish having fibres with a fibre length distribution such that at least 95% of the fibres have a length less than about 15 mm. The method optionally includes refining the fibre furnish in a high consistency disc refiner before dewatering. The method also includes dewatering the fibre furnish without chemical addition, to produce a cellulose fibre cake and a filtrate, the cellulose fibre cake having a moisture content less than about 40% (w/w). The method finally includes refining the cellulose fibre cake in at least one disc refiner to produce the mouldable cellulosic fibrous material.