Mycelium Lignocellulose Composite Strength via Segmented Cultivation
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Solution Overview
Problem
Existing mycelium-based lignocellulosic composite materials lack sufficient strength and stability for load-bearing applications, limiting their use in construction and other structural contexts.
Innovation Solution
A method for producing a mycelium-based lignocellulosic composite material involving the inoculation of a lignocellulose-based substrate with fungal spores, followed by controlled incubation phases to promote cross-linked mycelium growth, and finally joining and drying the material to enhance its structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional mycelium cultivation methods are used, then the material can be produced with good thermal insulation and low density, but the compressive and shear strength are insufficient for load-bearing applications
Solution Approach 1:
The cultivation process is divided into distinct phases: initial mycelium growth phase and secondary growth phase after substrate removal. This segmentation allows optimization of each phase for specific purposes - initial growth establishes the base structure while secondary growth develops the load-bearing hyphal network, resolving the contradiction between strength and manufacturing simplicity
Solution Approach 2:
The substrate is pre-treated and inoculated with fungal spores before the main cultivation process. This preliminary action ensures uniform mycelium distribution and establishes a controlled growth foundation, enabling subsequent strength optimization without complicating the overall manufacturing process
2Strength
If the mycelium is cultivated to increase density and strength, then load-bearing capacity improves, but the thermal insulation properties deteriorate
Solution Approach 1:
The mycelium network is optimized with different properties in different regions - denser hyphal networks in load-bearing zones and more porous structures in insulation zones. This local differentiation allows the material to simultaneously achieve high compressive strength where needed and maintain thermal insulation properties in other areas
Solution Approach 2:
The material combines mycelium hyphae with controlled air pockets and substrate remnants to create a composite structure. The hyphal network provides structural strength while the porous composite matrix maintains thermal insulation, resolving the trade-off between strength and insulation properties
3Stability of the object's composition
If the mycelium growth is extended to improve structural stability, then the production time and resource consumption increase
Solution Approach 1:
The cultivation process uses periodic substrate removal and re-addition to stimulate different growth phases. This periodic action triggers the mycelium to transition from exploratory growth to structural hyphal formation, achieving structural stability in a controlled time frame rather than requiring continuous extended growth
Solution Approach 2:
The process incorporates feedback mechanisms where substrate presence and environmental conditions are adjusted based on mycelium growth stage. This feedback control optimizes growth rates and ensures structural stability is achieved at the earliest possible time, preventing unnecessary extension of production time
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 results in a composite material with increased compressive and shear strength, allowing it to be used in load-bearing applications and providing improved mechanical properties compared to traditional mycelium-based materials.
Implementation Method 1
Fungi can decompose lignin, hemicellulose and cellulose into their subunits. This occurs through the release of enzymes such as cellulases, laccases, amylases, proteases or lipases into the immediate environment, which break down the substrate.
Implementation Method 2
The degradation products are then absorbed by the hyphae and used for the growth of the fungus.
Implementation Method 3
When filamentous fungi grow, they form hyphae, which result in a close-meshed network and give the resulting material a solid structure.
Implementation Method 4
i) drying the precursor of the mycelium-based lignocellulosic composite material at a temperature in the range of 65 to 90° C. and obtaining a mycelium-based lignocellulosic composite material with a residual moisture content of 10 to 12% by weight
Data Source
AI summary
The present invention is in the field of materials engineering and provides a method for producing a mycelium-based lignocellulosic composite material. Likewise, uses of the composite material according to the invention and the composite material itself are provided.