Lignocellulosic Composite Touch Interface for Humidity Stability
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Solution Overview
Problem
Existing methods for treating lignocellulosic materials, such as wood, to enhance mechanical and chemical properties while preserving their architecture are complex, costly, and inefficient, particularly due to difficulties in impregnating the material with monomers and polymers, leading to either partial or complete delignification and loss of structural integrity.
Innovation Solution
A process involving partial delignification of lignocellulosic material followed by filling with a compound, forming a three-dimensional network of transformed filling compound incorporated into the cellulose and lignin structure, maintaining the material's architecture and enhancing mechanical, chemical, and optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If natural wood is used as a touch interface, then aesthetic appearance and natural texture are achieved, but sensitivity to temperature and humidity variations occurs
Solution Approach 1:
The patent applies composite materials by combining natural wood with synthetic polymers or resins to create a hybrid touch interface. The wood provides aesthetic appearance and natural texture, while the polymer matrix provides dimensional stability and resistance to environmental variations. This composite structure allows the touch interface to maintain both visual appeal and functional reliability in varying environmental conditions.
Solution Approach 2:
The patent modifies the physical and chemical parameters of wood through treatment processes such as impregnation with polymers, chemical modification of cellulose and lignin, or controlled delignification. These parameter changes enhance the wood's dimensional stability, moisture resistance, and dielectric properties while preserving its aesthetic characteristics, thereby improving reliability without sacrificing appearance.
2Strength
If wood is impregnated with monomer and polymer to improve mechanical properties, then resistance to compression and bending is enhanced, but the process requires high pressure and long duration
Solution Approach 1:
The patent changes the physical state parameters of the impregnation medium, such as using supercritical fluids or highly viscous polymer solutions that can penetrate wood pores more effectively under reduced pressure conditions. By modifying temperature, pressure, and chemical composition parameters, the impregnation process achieves deep penetration and strong bonding in shorter times without requiring extreme high-pressure conditions.
Solution Approach 2:
The patent replaces purely mechanical high-pressure impregnation methods with chemical or physicochemical mechanisms. This includes using solvent-based polymer impregnation, vapor-phase infiltration, or chemically activated polymerization within the wood structure. These substitutions reduce reliance on mechanical pressure while achieving equivalent or superior impregnation efficiency and mechanical property enhancement.
3Strength
If partial delignification is performed to fill structure with compound, then mechanical strength and stability are improved, but complete delignification may be achieved which compromises structural integrity
Solution Approach 1:
The patent applies partial delignification by controlling the degree of lignin removal to an optimal level that enhances mechanical strength and environmental stability without compromising structural integrity. By carefully adjusting delignification parameters such as treatment time, chemical concentration, and temperature, the process removes sufficient lignin to allow polymer infiltration and strengthening while retaining enough lignin to maintain the wood's structural framework and prevent collapse.
Solution Approach 2:
The patent precisely controls delignification parameters including chemical agent selection (e.g., alkaline, acidic, or enzymatic treatments), treatment duration, temperature, and subsequent polymer impregnation conditions. These parameter adjustments ensure that delignification proceeds to the optimal extent for strength enhancement while preventing over-delignification that would compromise structural integrity. The controlled parameter changes enable selective modification of wood composition to achieve desired mechanical properties.
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 process results in a composite material with improved mechanical strength, stability against temperature and humidity variations, and preserved structural integrity, suitable for use in touch detection devices and automotive applications.
Implementation Method 1
at least one step of soaking the structure of lignocellulosic material with at least one organic fluid to dissolve at least 40% and at most 85% by weight % of the lignin present in the material
Implementation Method 2
filling the partially delignified structure resulting from the washing step (2) with at least one filling compound, so as to produce a filled partially delignified structure... a three-dimensional network of transformed filling compound incorporated in a network of cellulose and lignin
Data Source
AI summary
A touch detection device comprises a touch interface (1) made of composite material comprising a lignocellulosic material and a resin, the lignocellulosic material being impregnated with the resin, the fraction of resin being between 30% and 80% by weight relative to the total weight of composite material. The resin impregnated makes it possible to render the touch interface stable irrespective of the temperature and moisture conditions with a view to use both outside and inside. Use of the touch detection device for a touchscreen.