Blackening is achieved by r>αapidly raising the temperature of thε‍♥©e material through the laser and the≥φ‌αn quickly cooling it ∞¥✔♦down, which is commonly referred toβ✘ as tempering. The keyγ• is to control the energy₽"∑ input.

As for how the laser marking mach↔¶ine can produce a black effect on the σα×γmaterial, there is no fixed metho✘×≤d for this. Because the pu∑£rity of the material is diff♣♦erent, the type of laser light source ∏≥λσused is also different, and ≠​✘the parameters are also different. The §₩₩&color depth is related ↑♦to the marking speed, fr‌‌↓♣equency, current size, densi↕§•δty, and laser power. ÷£$<As long as one link is not in place, €•The effect of typing w×≤¶→ill be completely diffe §$rent.

For example, stainless steel is u‍ §Ωsed for blackening, using optical fiberλ™βs or semiconductors. Gen₽♠>αerally, defocusing is u←↓sed for blackening ($Ω™defocusing, slow speed, high power)↕€✘<. Defocusing makes the spot &≈larger and the spot o✔<verlap rate increase₩♥​ s, making it easy to achieve tem↕™↓©pering. Positive focus can also be use¥↔€♥d, high frequency fiber can"  be used, energy density is reduced,  αλoverlap rate can also be guaranteed,±♣→ and tempering can be ach∑✔ieved.

To black out the alumina materia↑≥l, the MOPA machine ∑↕is used. The mopa laser engraving mγβachine has a wide pulse wid®↕th and pulse frequency adjustment ranφ☆♠γge. The narrow pulse width and δ¥ high frequency parameteσδrs can produce black e&↔☆ffects of different depths on the s<©‌urface of the alumina material. Fin→"™e and beautiful, no lΩ♠ess than silk screen printinβ♣g.

Part of the plastic material is black εαened, and the UV laser marking machin↓♥€e is used, etc.

PS: Blackout is more ti≤•☆me-consuming, good parameteδ→•‌rs can improve efficiency.

Related article: "Main Factors Affecting Al$'₽≤umina Laser Blackening"