Non-Baked Pencil Lead Filler Composition for Consistent Photographic Color
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Solution Overview
Problem
Conventional colored pencils exhibit glossy drawn lines that appear different in hue when viewed from various angles, causing issues in photography and affecting the perceived color accuracy, especially when capturing images with smartphones.
Innovation Solution
A non-baked pencil lead formulation comprising a wax, colorant, filler, water-soluble resin, and cellulose fiber, with a flaky substance ratio of 20 mass% or less and aggregate particle ratio of 80 mass% or more, where the filler is composed of calcium carbonate, magnesium sulfate, aluminum hydroxide, or magnesium carbonate, and has a luminous reflectance of less than 0.1.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If talc as a filler is used in conventional colored pencils, then the drawn line appears glossy when viewed from certain angles, but this causes the hue to appear different from the actual hue and creates unwanted glossy appearance in photographs
Solution Approach 1:
The patent changes the particle shape parameter of the filler from flaky (talc) to aggregate form, and controls the particle size distribution with aggregate particles comprising 80 mass% or more. This parameter change eliminates the light reflection that causes glossiness while maintaining color accuracy, as aggregate particles do not reflect light in the same way flaky particles do.
Solution Approach 2:
The patent extracts the problematic flaky substance (talc) from the filler composition and replaces it with aggregate particles. By removing the light-reflecting flaky structure and substituting it with non-reflective aggregate particles, the unwanted glossiness is eliminated while preserving the desired color properties.
2Illumination intensity
If flaky substances are used as filler in pencil leads, then the drawn line has a glossy appearance, but this causes unintended hues in photographed images
Solution Approach 1:
The patent modifies the physical parameter of the filler particles by converting them from flaky shapes to aggregate shapes, and ensures aggregate particles constitute 80 mass% or more of the filler. This parameter change fundamentally alters the light interaction properties, eliminating the angle-dependent reflection that causes color distortion in photographs.
3Ease of operation
If conventional fillers with flaky structure are used, then the pencil lead provides smooth writing, but the drawn lines exhibit angle-dependent glossiness
Solution Approach 1:
The patent changes the morphological parameter of the filler particles from flaky to aggregate structure, with aggregate particles making up 80 mass% or more. This structural parameter change eliminates the light reflection responsible for glossiness while the aggregate particles maintain the smooth writing experience through their particle characteristics.
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 provides a drawn line with imperceptible glossiness and consistent hue regardless of viewing angle, ensuring accurate color representation in photographs.
Implementation Method 1
the ratio of an aggregate particle in the filler is 80 mass % or more... the filler to have a luminous reflectance of less than 0.1, which is defined as the ratio of an intensity of reflected light
Data Source
AI summary
A non-baked pencil lead including a wax that is solid at normal temperature, a colorant, a filler, a water-soluble resin, and a cellulose fiber, wherein a ratio of a flaky substance in the filler is 20 mass % or less, and the ratio of an aggregate particle in the filler is 80 mass % or more.