Pe diferite materiale sunt aplicate diferite culori printr-un proces numit imprimare. De obicei, this involves using UV printers to directly apply the colors onto the material’s surface. Alternatively, colors can be printed onto plastic film using UV DTF machines and then transferred onto the materials. in orice caz, recent technological advancements have introduced a new method known as laser color engraving. In the essay, we will provide a detailed introduction to this innovative technique.
Cuprins
How it works？
The process involves the interaction of a laser beam with the surface of metal, resulting in the formation of a semi-transparent oxide film on the metal surface. Light penetrates the oxide film at a specific angle, with some reflecting directly at the interface between the air and the oxide layer, creating direct reflection light. Another portion of the light refracts into the semi-transparent oxide layer, then refracts again into the air, forming refracted light. These two light components interfere with each other, causing some wavelengths to reinforce while others cancel out due to the interference phenomenon, thus creating various color effects.
By precisely controlling the laser’s energy density and temperature and consequently adjusting the thickness of the oxide film on the metal surface, different color laser marking effects can be achieved.
Laser Types Used:
In the world of laser color marking, two laser types are commonly used: diode lasers and lasere cu fibră. Laser cu diode, known as continuous lasers, have advanced significantly in laser integration technology. With power levels now reaching up to 20W, 40W, or even 80W, they can create semi-transparent films on stainless steel surfaces. in orice caz, due to the somewhat unstable nature of diode lasers, the resulting colors may vary, posing challenges for achieving precise engraving effects. Xtool is renowned for this kind of laser machines
Pe de altă parte, fiber lasers operate using pulsed light. By controlling stable electrical signals, fiber lasers ensure consistent laser energy output, offering a more reliable process. Within the realm of fiber lasers, MOPA fiber lasers (Amplificator de putere Master Oscilator) machines excel. They provide precise control over pulse frequency and width, enabling adjustments to the laser’s power density and marking temperature for superior color marking effects. Commarker’s MOPA fiber laser engravers is a prime example of this technology.
Mașină de marcat cu laser cu fibră ComMarker B4 JPT MOPA
Fibra ComMarker B4 -MOPA JPT MOPA permite marcarea culorilor vibrante pe oțel inoxidabil și gravare cu contrast ridicat pe aluminiu anodizat. Nu
Suitable Materials
Currently, laser color marking is limited to certain metal materials. The most common is stainless steel, followed by titanium steel.
Operating Procedure
Unlike engraving and color filling, where a groove is engraved into the surface of the material and then filled with color, laser color engraving directly uses a laser engraver to engrave colors into the surface of stainless steel. We use ComMarker MOPA gravator laser cu fibra as a case demonstration
Etapa 1: Design the Engraving Pattern
The pattern can generally be downloaded from a special image library or designed using Photoshop.
Notă: the image’s colors should not have gradients and should be of a single color.
Etapa 2: Convert the Pattern into a File Compatible with the Engraving Software
The designed pattern needs to be converted into a vector file, such as AI, before being imported into engraving software like EZCAD or LightBurn.
Etapa 3: Find the Engraving Parameters Corresponding to the Colors
Import a color grid template and engrave it on a same kind of material with same thickness as the one to be used for the final engraving.
Notă: While conventional engraving typically uses a parameter database, color engraving parameters vary with different engraving machines. Small deviations in laser components can cause significant color changes, including the laser source, galvanometer, field lens, and their relative distances. Even the same machine can produce different results at different focal lengths, requiring users to find the correct color engraving parameters before engraving.
Etapa 4: Assign Corresponding Color Parameters to the Engraving Pattern
Import the designed engraving pattern and reassign parameters according to the color grid template to ensure that each part’s color matches the design as closely as possible.
Etapa 5: Start Engraving
You can now start the engraving process!
Advantages and Disadvantages of Laser Color Engraving
Avantaje
●Long-lasting Colors: Compared to UV color printing, laser color engraving results in more durable colors that are not easily wiped off.
●No Consumables: Laser engraving does not require consumables, reducing daily maintenance and material costs.
Disadvantages
●High Operation Difficulty: Laser color engraving technology is more complex and requires skilled technicians to operate. Finding the correct engraving parameters can take a considerable amount of time.
●Low Color Richness: Laser engraving may sometimes lack the color richness that UV printing can achieve.
Application Fields
Laser color engraving is widely used in various industrial fields such as advertising, product color marking, and gift customization. It also offers a new business opportunity for entrepreneurs to create exquisite customized color items for customers, such as pet tags, nameplates, Bijuterii, și altele.
