How to Avoid Color Fading Problems with Laser Marking

Color fading after laser marking is usually caused by improper selection of material, improper setting of parameters, or improper post-processing.The company's experts analyze the main reasons for color fading, and provide practical solutions such as pre-processing of materials, optimization of parameters, and protective coatings, to help users effectively extend the life of their printed colors.

Why did the color fade after laser marking?

Many friends of mine discovered that the pattern made by laser engraving was clearly visible at first, but faded or disappeared over time.In fact, this is mainly related to three factors: the characteristics of the material itself, the laser parameters not being adjusted correctly, or the lack of protection after marking.For example, if too much power is used to mark stainless steel, the metal oxidizes and changes color. If the surface of a plastic product is not cleaned thoroughly, the marking may not adhere properly, and may flake off with even slight rubbing.

The key to prevention is to nip the problem in the bud.

Choosing the right materials is key.

Not all materials are suitable for dark labeling.Materials like anodized aluminum, stainless steel, and some engineering plastics (such as ABS) can be marked to produce a more stable color.For ordinary plastics or metals, it is recommended that you first do a sand blasting or coating, so that the laser can produce a stable reaction.

The parameters need to be finely adjusted.

The higher the power, the better? Take stainless steel as an example. If you use medium-to-low power (20-30W) with high frequency (50-80kHz), you can get a more stable black oxide layer.After printing, wipe the sample with an alcohol-soaked cotton ball. If the ink wipes off, you'll need to adjust the energy density.

Post-processing is no time to be lazy.

After the label is applied, a layer of clear protective lacquer is applied. The cost is less than NT $ 0.50, but the durability is greatly increased.In particular, UV-cured adhesives and nanoscale hydrophobic coatings are used for parts that are often in contact with oil or are used outdoors. These coatings not only prevent scratching, but also block UV radiation.

Small tips for daily maintenance.

No matter how well you care for it, long-term rough use will still shorten its life.It is recommended that wire brushes not be used to scrub the area where the marking has been made, and that strong acids or bases not be used in cleaning.If it is a high-contact area such as the handle, then every six months a protective wax should be reapplied.

What can be done about fading?

If there is already some fading, don't rush to do a reapplication.Simply use a cotton swab to apply a special colorant (available at any hardware store for NT $ 10 a bottle) and then use a hair dryer to heat-dry and set the color.If the fading is extensive, it is best to repaint and apply a protective coating.