Oxygen-Deficient Bismuth Oxide Additive for Laser Marking
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Solution Overview
Problem
Current laser marking techniques face challenges in achieving high visibility and definition on resin molded materials due to poor absorption of laser light, leading to insufficient blackness and contrast, especially with additives like mixed oxides of tin and antimony, which fail to effectively convert laser light to heat for carbonization.
Innovation Solution
The use of oxygen-deficient bismuth oxide with a specific oxygen deficiency range (0.01 ≤ x ≤ 0.3) as an additive, which absorbs laser light and develops high black coloration, improving marking quality without undesirable coloration of the material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional additives like mixed oxides of tin and antimony are used for laser marking, then the marking process can be performed, but the visibility and definition of the marking are insufficient due to poor laser light absorption and inadequate carbonization
Solution Approach 1:
The patent changes the chemical composition parameters of the additive by controlling the oxygen deficiency level in bismuth oxide (Bi2O3-x where 0 < x ≤ 0.3). This parameter change enables the additive to effectively absorb laser light at 1064 nm wavelength and convert it to heat, achieving proper carbonization of the resin surface for high-visibility marking with excellent definition and blackness
Solution Approach 2:
The patent uses bismuth oxide with controlled oxygen deficiency as a composite additive material. The oxygen-deficient bismuth oxide creates a composite structure that combines the base bismuth oxide framework with oxygen vacancy sites, enhancing laser absorption capability and thermal conversion efficiency for superior marking performance
2Illumination intensity
If additives are added to improve laser absorption, then marking visibility improves, but the additive may cause undesirable coloration of the molded material
Solution Approach 1:
The patent precisely controls the oxygen deficiency parameter x in Bi2O3-x to be within the range 0 < x ≤ 0.3. This parameter control ensures the additive provides sufficient laser absorption for visible marking while maintaining the material's natural color appearance, avoiding undesirable darkening or discoloration of the molded material
3Illumination intensity
If high laser output is used to achieve sufficient blackness in thin film materials, then marking visibility improves, but the laser light penetrates through the material causing insufficient blackness and poor marking quality
Solution Approach 1:
The patent changes the optical absorption parameters of the additive by introducing oxygen deficiency in bismuth oxide. This enables the additive to absorb laser light more efficiently at the material surface, generating sufficient heat for carbonization even in thin film materials with low laser output, preventing light penetration and achieving consistent blackness and high-quality marking
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 oxygen-deficient bismuth oxide additive enhances laser marking by achieving excellent blackness and contrast on resin compositions, regardless of the substrate type or shape, without coloring the material, thus improving the overall marking performance.
Implementation Method 1
the additive acts by absorbing a laser light to convert the light to heat
Implementation Method 2
when the above-mentioned particles in a resin molded material absorb a YAG laser light, the light is converted to heat
Implementation Method 3
oxygen-deficient bismuth oxide with a specific oxygen deficiency range (0.01 ≤ x ≤ 0.3) as an additive, which absorbs laser light
Data Source
AI summary
The present invention is directed to a bismuth oxide-based additive for laser marking containing oxygen-deficient bismuth oxide represented by the general formula: Bi2O(3-x) (provided that x is 0.01 or more and 0.3 or less and x represents the amount of oxygen deficiency calculated according to the formula: x = 3 - O1s/Bi4f × 2 from the ratio (O1s/Bi4f) of the peak area attributed to the 1 s electrons of oxygen bonded to bismuth to the peak area attributed to the 4f electrons of bismuth obtained by X-ray photoelectron spectrometry), which enables marking with excellent blackness and contrast without causing undesirable coloration of a resin composition regardless of the type or shape of a resin to be used.