Marking Composition Using Inorganic Pigments for High-Contrast Laser Marking
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Solution Overview
Problem
Existing marking compositions lack sufficient concealing properties, heat resistance, and discrimination capability, particularly when used for high-temperature applications and reading with reflective-type laser readers.
Innovation Solution
A marking composition using inorganic pigments with specific particle diameters, a heat-resistant titanium-containing ceramic resin, and auxiliary additives like mica, talc, or silica, which enhances concealing properties, heat resistance, and high-definition marking with high contrast, suitable for use with CO2 lasers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pigment with transparency and strong reflection is used in the marking composition, then the marking can be formed on the surface, but the marking discrimination capability is reduced
Solution Approach 1:
The patent applies color changes principle by using inorganic pigments with specific light absorption characteristics that change the optical properties of the marking. The pigment absorbs light in specific wavelengths and reflects others, creating high contrast markings that are easily distinguishable while maintaining appropriate visibility
Solution Approach 2:
The patent uses composite materials by combining inorganic pigments with specific refractive indices with resin components to create a marking composition with optimized optical properties. This composite approach allows simultaneous achievement of good concealing properties, heat resistance, and high discrimination capability
2Temperature
If a resin with large heating loss is used in the marking composition, then the marking can be formed, but the heat resistance of the marking is insufficient
Solution Approach 1:
The patent applies parameter changes by carefully selecting and controlling the heating loss characteristics of the resin component. The resin is chosen to have specific thermal properties that minimize heating loss while maintaining marking formability, achieving optimal balance between processing ease and heat resistance
Solution Approach 2:
The patent uses composite materials by formulating a marking composition that combines heat-resistant inorganic pigments with resin having controlled heating loss characteristics. This composite structure provides both the necessary thermal stability and the marking formation capability
3Reliability
If the concealing properties of the marking composition are improved, then the marking becomes more visible, but the discrimination capability may be compromised
Solution Approach 1:
The patent applies local quality principle by optimizing the refractive index matching between pigment and resin in specific regions of the marking composition. This creates localized optical properties that enhance concealing properties in the base coating while maintaining high discrimination capability in the marked areas through controlled light interaction
Solution Approach 2:
The patent uses composite materials with specifically selected inorganic pigments having refractive indices of 1.5-2.5 combined with appropriate resin to achieve both excellent concealing properties and high discrimination capability simultaneously through optimized light absorption and scattering 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 composition achieves excellent concealing properties, heat resistance, and high-definition markings with improved discrimination capability, maintaining readability even at high temperatures and reducing microcracks, thus ensuring stable and readable information display.
Implementation Method 1
irradiating predetermined parts of the coating layer with a carbon dioxide (CO2) laser beam to blacken the irradiated parts
Data Source
Figure 1A~1B
Figure 1C
Figure 2
AI summary
A marking composition comprises an inorganic pigment having an average diameter of o.1 to 5 µm and a titanium-containing ceramic resin. The composition exhibits excellent concealing properties and heat resistance and produces a high definition marking with high contrast and excellent discrimination capability when applied to the surface of an article.