Single-Step UV Laser Marking of Black Silk-Screen Printed Glass for Control Panels
Abstract:
The integration of 355 nm ultraviolet (UV) laser marking technology offers a novel approach for the precise removal of ink and simultaneous marking of the underlying glass in black silk-screen printed glass control panels. This paper explores the optimal parameters for achieving this without damaging the glass substrate or causing the ink to carbonize and turn black, thus maintaining the aesthetic and functional integrity of the control panels.
Introduction:
Black silk-screen printed glass is widely used in control panels due to its aesthetic appeal and functional benefits. Traditional methods of marking or removing ink often involve multiple steps, which can be time-consuming and may compromise the quality of the glass surface. The use of a 355 nm UV laser marking machine provides a more efficient and precise alternative, capable of removing the ink layer while marking the glass in a single operation.
Materials and Methods:
The study utilized a 355 nm UV laser marking machine to target black silk-screen printed glass samples. The laser's parameters, including power, pulse width, and repetition rate, were systematically varied to determine the optimal settings for ink removal and glass marking. The process involved the following steps:
1. Sample Preparation: Black silk-screen printed glass samples were prepared with uniform ink layer thickness.
2. Laser Marking Parameters: The laser marking machine was set with different energy densities to ensure efficient ink removal without damaging the glass.
3. Marking Process: The samples were marked using the laser, and the resulting marks were analyzed for clarity and depth.
4. Post-Marking Analysis: The samples were inspected for any signs of carbonization, glass damage, or ink residue.
Results:
The experiments revealed that at an energy density of 0.2 mJ/cm², the 355 nm UV laser was capable of removing the ink effectively without causing carbonization or damage to the glass substrate. The optimal pulse width was found to be 10 ns, with a repetition rate of 100 kHz, ensuring a clean and precise marking result.
Discussion:
The success of the single-step process lies in the UV laser's ability to selectively interact with the ink, causing it to vaporize without transferring excessive heat to the glass. This selective ablation is crucial for maintaining the integrity of the glass and ensuring that the marking process does not lead to any form of structural weakness or aesthetic degradation.
Conclusion:
The study demonstrates that a 355 nm UV laser marking machine can effectively remove black ink from silk-screen printed glass and mark the underlying glass in a single step. This process offers a significant advancement in the field of glass marking, particularly for applications in control panels where precision and aesthetics are paramount. The optimal energy density and pulse parameters provide a reliable method for achieving high-quality marks without compromising the substrate.
Keywords: UV Laser Marking, Black Silk-Screen Printed Glass, Control Panels, Ink Removal, Single-Step Process
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