Sintered Colored Lead Impregnation for Erasable Writing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing colored leads and chalks face challenges in achieving high color intensity while maintaining good erasability, with previous solutions resulting in strokes that are less intense in color and requiring complex preparation processes.
Innovation Solution
A sintered colored lead or chalk with a composition of 1-25% binder and 25-99% filler, where the colorant and lubricant are introduced post-sintering through impregnation, preventing damage from high temperatures and allowing for adjustable properties and color variations, using fillers like boron nitride, kaolin, and clay to enhance erasability and mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If colorant is added to the lead material before sintering, then the color intensity should be high, but the colorant is damaged by high temperatures during sintering
Solution Approach 1:
The sintered lead base body is prepared in advance through sintering, and the colorant is introduced afterward through impregnation. This preliminary preparation of the base body without colorant avoids temperature damage to the colorant while ensuring the base body structure is ready for subsequent coloring.
Solution Approach 2:
The production process is divided into separate stages: first producing the sintered lead base body, then separately introducing the colorant through impregnation. This segmentation allows each component to be optimized independently - the base body for mechanical properties and the colorant for color intensity without mutual interference.
2Ease of operation
If plastic particles are integrated into the colored lead to achieve erasability, then the erasability is improved, but the color intensity of the stroke is reduced
Solution Approach 1:
The sintered lead base body possesses a porous structure that enables effective impregnation with colorant solutions. The porosity allows deep penetration and uniform distribution of colorant throughout the material, achieving high color intensity without requiring excessive plastic content that would compromise erasability.
Solution Approach 2:
The colored lead combines sintered lead base material with plastic particles and colorant in a composite structure. The sintered lead provides mechanical strength and erasability through its porous structure, while the colorant impregnated within delivers intense coloration, creating a synergistic composite material that achieves both erasability and color intensity.
3Strength
If the binder proportion is increased to improve mechanical strength, then the mechanical properties are enhanced, but the erasability deteriorates
Solution Approach 1:
The binder proportion is optimized within a specific range (5-25% by weight) to achieve the desired balance between mechanical strength and erasability. This parameter optimization ensures sufficient binding for structural integrity while maintaining enough porosity and plasticity for erasability, preventing either extreme from dominating.
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 achieves high color intensity with improved erasability and mechanical properties, allowing for the production of colored leads and chalks suitable for various papers, with the ability to adjust the color and mechanical strength by varying the filler content, and simplifying the preparation process by standardizing the base body production.
Implementation Method 1
The sintered lead or chalk base body is impregnated with at least one colorant and at least one lubricant
Implementation Method 2
the colorant is dissolved in a solvent
Implementation Method 3
a sintered chalk or lead base body is prepared from a chalk or lead base material
Data Source
AI summary
A colored lead for writing, drawing and coloring implements, more particularly erasable, sintered colored lead, or to a colored chalk, more particularly erasable, sintered colored chalk, having a sintered lead or chalk base body which is formed from a lead or chalk base material containing at least one binder with a proportion of from 1 to 25% by weight and at least one filler with a proportion of from 25 to 99% by weight. The sintered lead or chalk base body is impregnated with at least one colorant and at least one lubricant.