Rewritable Board Using Porous Aluminum Oxide Layer
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Solution Overview
Problem
Conventional rewritable boards often use hazardous chemicals for writing and erasing, leading to environmental pollution, and existing solutions rely on special pigments that are not environmentally friendly.
Innovation Solution
A rewritable board made of anodized aluminum with a porous aluminum oxide layer and a metal layer, using common fluids like water, alcohol, or glycerol for writing, which undergoes physical changes for erasure without generating waste, utilizing a heating plate for fluid removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional rewritable boards use special pigments and chemical materials for rewriting, then rewriting functionality is achieved, but environmental pollution and hazardous waste are generated
Solution Approach 1:
The patent removes special pigments and chemical materials from the rewriting system, extracting only the essential functional components (porous aluminum oxide layer and metal layer) that enable rewriting through physical fluid absorption and evaporation processes
Solution Approach 2:
The patent changes the rewriting mechanism from chemical reactions involving special pigments to physical processes involving common fluids (water, alcohol) that are absorbed by the porous aluminum oxide layer and removed through evaporation or heating
2Ease of operation
If paper is used for recording words or pictures, then writing and recording functions are achieved, but disposable paper consumption increases causing environmental issues
Solution Approach 1:
The patent enables recovery and reuse of the writing surface by evaporating or wiping away the fluid used for writing, allowing the same board to be used repeatedly instead of discarding paper after single use
Solution Approach 2:
The rewritable board serves multiple writing cycles with the same physical substrate, making a single object perform the function of multiple disposable papers
3Reliability
If thermochromic materials or fluorescent materials are used for rewriting, then rewriting capability is achieved, but complicated and dangerous chemical materials are required
Solution Approach 1:
The patent uses common, inexpensive fluids (water, alcohol, glycerol, silicon oil) that can be easily applied and removed, replacing expensive and complex thermochromic or fluorescent materials
Solution Approach 2:
The patent replaces complex chemical mechanisms (thermochromic reactions, fluorescent transformations) with simple physical mechanisms (fluid absorption, evaporation, and capillary action)
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 allows for repeated writing without environmental contamination, using physical reactions instead of chemical ones, and efficiently reverts the board to a clean state for reuse.
Implementation Method 1
the porous aluminum oxide layer has a porosity ranging from 10% to 80%
Implementation Method 2
the fluid is evaporated or wiped out from the rewritable board
Data Source
AI summary
The present invention discloses a using method of a rewritable board. It comprises applying or removing a fluid on the rewritable board for writing repeatedly, wherein the rewritable board is an aluminum based material sequentially having a porous aluminum oxide layer and a metal layer thereon, and wherein the porous aluminum oxide layer has a porosity ranging from 10% to 80%.