Woody Flow Molding Material for Higher Fluidity and Shape Stability
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Solution Overview
Problem
Existing wood flow molding methods face challenges in achieving high productivity and shape stability of woody molded articles due to limited fluidity and deformation of xylem cells under pressure.
Innovation Solution
A woody material for wood flow molding is developed with a specific absorption peak ratio (HB/HA) in the infrared spectrum and controlled lignin content, enhancing slippage between xylem cells and improving fluidity, allowing for greater deformation and shape stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional compression processing is used to densify lumens of xylem cells, then shape change is achieved, but amount of deformation is limited
Solution Approach 1:
The invention changes the physical-chemical parameters of the woody material by controlling lignin content (10-30% by mass) and moisture content (30-200% by mass), which enables the material to achieve much larger deformation amounts during flow molding compared to conventional compression processing, while still achieving the desired shape change
2Shape
If wood flow molding is used to increase deformation amount, then plastic processing of arbitrary shape is achieved, but fluidity of woody material under pressure is insufficient
Solution Approach 1:
The invention optimizes the fluidity parameter by precisely controlling the lignin content (10-30% by mass) and moisture content (30-200% by mass) of the woody material, enabling it to flow sufficiently under pressure to fill arbitrary mold shapes while maintaining productivity
Solution Approach 2:
The invention creates an optimized composite structure within the woody material by maintaining specific proportions of lignin, cellulose, and hemicellulose, where lignin acts as a binder and plasticizer that enhances fluidity under pressure, allowing the material to deform and flow into complex shapes
3Productivity
If lignin content is increased to improve fluidity, then deformation capability is enhanced, but mechanical properties may be compromised
Solution Approach 1:
The invention identifies and maintains an optimal parameter range for lignin content (10-30% by mass) that simultaneously provides sufficient fluidity for deformation and adequate mechanical strength, avoiding both deficiency and excess of lignin
4Stability of the object's composition
If resin content is increased to improve mechanical properties, then shape stability is enhanced, but resource waste and environmental concerns increase
Solution Approach 1:
The invention replaces expensive and environmentally problematic synthetic resins with naturally occurring woody material components (lignin, cellulose, hemicellulose) that provide adequate shape stability without the same environmental concerns, effectively using disposable renewable resources instead of persistent synthetic materials
Solution Approach 2:
The invention optimizes the moisture content parameter (30-200% by mass) to enhance the binding and stabilizing properties of the natural woody material components, reducing the need for additional resin additives while maintaining shape stability
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 solution results in improved productivity and mechanical properties of woody molded articles with enhanced fluidity and shape stability, reducing resin content and addressing resource and environmental issues related to waste.
Implementation Method 1
the wood flow molding utilizes compression of xylem cells constituting the woody material by pressurization
Implementation Method 2
the lump-shaped woody material is deformed by a position change due to a slippage phenomenon between xylem cells
Implementation Method 3
a ratio (HB/HA) between a height (HA) of an absorption peak derived by C−H stretching vibration detected at a wavenumber from 2850 cm−1 to 2950 cm−1 and a height (HB) of an absorption peak derived by skeletal vibration of an aromatic ring detected at a wavenumber from 1480 cm−1 to 1540 cm−1
Data Source
AI summary
A woody material, where a ratio (HB/HA) between a height (HA) of an absorption peak derived by C—H stretching vibration detected at a wavenumber from 2850 cm-1 to 2950 cm-1 and a height (HB) of an absorption peak derived by skeletal vibration of an aromatic ring detected at a wavenumber from 1480 cm-1 to 1540 cm-1 is 1.10 or less in an ATR spectrum of an inside or a surface of the woody material by an infrared spectroscopic analysis method.