Foamed Cellulose Base Material for Lightweight Wood Substitutes
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Solution Overview
Problem
The wood-based materials industry faces a shortage of wood resources due to increasing energy costs, excessive felling, and the need for lighter materials with equivalent technical properties, prompting the search for alternative cellulose and lignocellulose-based materials.
Innovation Solution
A method involving a cellulose and/or lignocellulose-containing material with a foam-forming component, mixed at high temperature and excess pressure to create a homogeneous mixture that expands and solidifies upon pressure and temperature decrease, resulting in a lightweight, foamed structure with improved tensile and compressive strengths, suitable for producing wood materials like chipboard and oriented strand boards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If traditional wood materials are used, then structural strength and stability are achieved, but weight reduction is not possible
Solution Approach 1:
The patent applies porous materials by incorporating a foaming agent that creates a cellular foam structure within the wood-based material. This foam structure reduces the bulk density and weight of the material while maintaining structural integrity through the cell wall network, directly resolving the contradiction between weight reduction and strength maintenance
Solution Approach 2:
The patent uses composite materials by combining wood fibers or chips with a foaming agent and binder to create a new material system. The composite structure integrates the reinforcing effect of wood particles with the lightweight foam matrix, achieving both weight reduction and preserved structural strength
2Quantity of substance
If wood resources are increased to meet demand, then material availability improves, but environmental sustainability deteriorates
Solution Approach 1:
The patent applies discarding and recovering by utilizing wood residues, sawdust, and other wood-based by-products that would otherwise be discarded. This approach increases material availability for production while promoting sustainability by giving value to waste materials and reducing the need for additional logging
Solution Approach 2:
The patent uses readily available, low-cost wood residues and by-products as raw materials. These materials are typically short-lived in terms of their utility chain (waste streams from processing), but the invention extends their value by incorporating them into durable foam-based wood materials for various applications
3Weight of moving object
If density is reduced to lighten materials, then weight decreases, but mechanical strength deteriorates
Solution Approach 1:
The patent employs porous materials through controlled foaming that creates a cellular structure with optimized cell wall thickness and distribution. This porous architecture maintains mechanical strength by distributing loads across the cell walls while keeping the overall density low, preventing the typical strength loss associated with density reduction
Solution Approach 2:
The patent uses composite materials by dispersing wood fibers, chips, or particles within the foam matrix. These solid inclusions act as reinforcement elements that carry mechanical loads, compensating for the reduced density and maintaining or even enhancing mechanical strength compared to solid foam structures
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 produces base materials with a bulk density lower than wood, offering equivalent technical properties and reduced weight, while maintaining pressure and dimensional stability, enabling the creation of lighter wood materials that can be used in existing systems.
Implementation Method 1
the mixture is then foamed while increasing its volume with decreasing pressure and decreasing temperature
Implementation Method 2
partially hardened by duromer crosslinking, solidified foam structure
Data Source
AI summary
The invention relates to a method for producing a base material preferably comprising comminuted cellulose and/or lignocellulose-containing material, characterized in that the cellulose and/or lignocellulose-containing material has a foaming component, that the material is mixed homogenously at a high temperature and overpressure to form a mixture, and that the mixture is then foamed while expanding the volume thereof under decreasing pressure and decreasing temperature, and that the foamed mixture then solidifies to form the base material.