Preventing Carbonization of Dye Layer in Color Filter Glass Edge Marking with 355 nm UV Laser
Abstract:
The use of 355 nm ultraviolet (UV) laser marking technology offers a precise and efficient method for marking color filter glass (CFG) with edge positioning codes. However, the process can lead to carbonization and discoloration of the dye layer if not properly controlled. This article discusses the critical parameters and techniques required to prevent carbonization of the dye layer during the UV laser marking process, ensuring high-quality and durable markings on CFG.
Introduction:
Color filter glass is widely used in various applications such as displays, optical filters, and decorative glassware. Edge positioning codes are essential for precise assembly and tracking. The 355 nm UV laser marking machine provides a non-contact, high-resolution marking solution. However, the high energy of the UV laser can cause unwanted side effects, such as carbonization of the dye layer, which can compromise the appearance and functionality of the CFG. This article will explore the optimal laser parameters and process control strategies to achieve clean, crisp markings without damaging the dye layer.
Laser Marking Parameters:
The key to preventing carbonization lies in controlling the laser's energy density, pulse width, and repetition rate. The energy density must be high enough to ablate the dye layer effectively but low enough to avoid thermal damage to the glass substrate.
1. Energy Density: The energy density should be adjusted to just above the ablation threshold of the dye layer. This can be determined through a series of tests, marking samples with varying energy densities and observing the results.
2. Pulse Width: A shorter pulse width reduces the heat affected zone, minimizing the risk of carbonization. Pulse widths in the range of nanoseconds are typically used for UV laser marking of CFG.
3. Repetition Rate: A lower repetition rate allows for more time between pulses for heat dissipation, reducing the overall temperature increase in the dye layer.
Process Control Strategies:
In addition to laser parameters, the following process control strategies can help prevent carbonization:
1. Beam Quality: High-quality beams with minimal divergence ensure that the energy is delivered uniformly to the dye layer, reducing the risk of hotspots that can cause carbonization.
2. Scanning Speed: Adjusting the scanning speed can help control the amount of heat deposited in the dye layer. A slower speed allows for more precise control but may reduce throughput.
3. Atmosphere Control: Marking in an inert atmosphere or with a purge gas can reduce oxidation and subsequent carbonization of the dye layer.
4. Pre- and Post-Processing: Pre-cleaning the glass surface can remove contaminants that might absorb laser energy and cause carbonization. Post-processing, such as a gentle rinse or擦拭, can remove any residual dye particles that could oxidize and discolor.
Conclusion:
By carefully controlling the laser marking parameters and implementing effective process control strategies, it is possible to prevent carbonization of the dye layer when marking color filter glass with a 355 nm UV laser. This ensures that the edge positioning codes remain clear and legible, maintaining the integrity and aesthetic appeal of the CFG. Further research and development in laser marking technology will continue to improve the process, making it even more reliable and efficient for the glass industry.
[Note: The word count for this article is approximately 500 words, well within the 2500-word limit as requested.]
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