Laser marking technology is one of the most widely used applications in laser processing. It involves using a high-energy-density laser to illuminate a workpiece locally, causing a chemical reaction on the surface material, either by vaporization or color change, resulting in a permanent mark. This technique can produce a wide range of text, symbols, and patterns, with character sizes ranging from millimeters to micrometers, making it ideal for fine processing of products. As a modern precision machining method, laser marking offers significant advantages over traditional techniques like etching, EDM, mechanical scribing, and printing. The following sections will explore several new applications and technologies in laser engraving for the surface treatment of 3C products.
New Application 1: Laser Engraving on Laptop Shells
The rapid growth of the notebook computer market has led to intense competition, driving the development of advanced processing technologies. Laser engraving on laptop casings is one of the latest and most innovative methods in this field. Through the laser wire drawing process, not only is the casing's durability ensured, but heat dissipation is also improved. The results are elegant, precise, and stylish, blending well with human-centered and entertainment themes, adding a sense of texture and sophistication.
The Huagong LSD12E large-format laser marking machine is commonly used for this purpose. It can achieve speeds up to 1600 mm/s, with a maximum speed of 10,000 mm/s. A 14-inch notebook panel can be intricately engraved with graphics in about 7 minutes. Directly engraved on aluminum, magnesium alloy, and stainless steel shells, the results feature beautiful graphics and clean edges—making it an excellent alternative to screen printing and knife engraving. After engraving, silver plating enhances the texture, giving it a smooth, oily finish.
New Application 2: CO2 Galvanometer Engraving for Alloy Surface Oxygen Removal
A dynamic CO2 galvanometer engraving machine can effectively remove oxygen from the surface of magnesium alloys and notebook heat sinks. It operates efficiently without igniting materials, offering high precision and fast speed. The filling method is optimized, making it ideal for surface treatment in industrial settings.
New Application 3: Light Marking on Keyboards and Plastic Parts
Large-format full-page marking on notebooks eliminates the need for multiple clamping operations, significantly improving marking efficiency. A full-page design can be completed in approximately 15 seconds, ensuring consistency and quality.
New Application 4: Laser Marking on Mobile Phone Buttons
This application allows for precise and durable markings on small components like phone buttons, enhancing both aesthetics and functionality.
New Application 5: Cutting Insulation Pads for Mobile Phones
Laser cutting provides a clean and efficient way to shape insulation pads, reducing material waste and improving production accuracy.
New Application 6: UV Laser Marking
Unlike infrared lasers, UV microprocessing is a "cold" process that doesn't rely on heat. UV light is more easily absorbed by many materials, allowing high-energy photons to break molecular bonds directly on non-metallic surfaces. This leads to smooth edges and minimal carbonization. UV lasers offer superior precision compared to mechanical methods, with the ability to focus at sub-micron levels, enabling efficient processing even at low pulse energy.
UV lasers have three main advantages over infrared and green lasers:
1. They are more effective on a wider range of materials.
2. Their photon energy is stronger—for example, a 1W UV laser is equivalent to a 3W infrared laser.
3. They can focus on smaller spots, making them ideal for delicate tasks.
The 355nm UV laser, with its short wavelength and small spot size, is perfect for cold processing, minimizing thermal effects. It is especially suitable for marking glass, polymer materials, micro-holes (d ≤ 10μm), flexible PCBs, LCDs, TFTs, and dicing.
New Application 7: Laser Color Marking
Color marking machines use advanced optical technology and a unique water-cooling system to enhance laser power and beam stability. They are particularly effective for color and light-transfer buttons. This method is suitable for marking various materials, including metals, molds, plastics, PVC, and ceramics.
New Application 8: Laser Depth Marking
Laser depth marking is still relatively uncommon but is gaining traction in applications such as blackening and deepening of bearings and crafts. Compared to traditional mechanical engraving, it offers a more refined appearance, stronger 3D effect, and faster processing speed, making it a promising surface treatment solution.
New Application 9: Narrow Pulse Width Laser Marking
Narrow pulse width lasers provide distinct benefits in laser engraving. With pulse widths typically under 10 ns, they deliver high peak power, making them ideal for precise and fine marking. These lasers are compact, allowing for reduced equipment size and space savings in production areas. Their adjustable repetition frequency (10–100 KHz) expands their applicability. Overall, narrow pulse width lasers enable finer beam quality, leading to better performance in micro-marking tasks.
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