Laser Marking on Plastic: What You Need to Know?

Laser Marking on Plastic: What You Need to Know?

Using a laser to engrave or imprint objects on plastic, called plastic engraving or laser marking, is a technique called plastic engraving. The laser beam must be absorbed by the plastic in order to carry out Lasit laser marking. Depending on the polymer used to make the plastic pieces, the lasering process and amount of energy it requires will vary.

Laser marking procedure

Obtaining adequate laser beam absorption into plastics is the key to laser marking them. Reflection accounts for most of the beam’s reflection in metals while transmission, diffuse reflection, and absorption account for most of the beam’s reflection in plastics. Since plastic has poor heat conductivity, the process of marking plastic is relatively energy-efficient. Since plastic can be marked much more quickly than metal, it is much faster to mark plastic.

It is common for plastic’s macromolecular structure to absorb ultraviolet and far-infrared light. In additives like carbon black and dyes, absorption occurs at a variety of wavelength spectrums. It is possible to adjust the wavelength of lasers according to the material due to the availability of multiple wavelengths.

 Marking with lasers: Methods and Techniques


There is a visible trace on the plastic left by the foaming process. Laser-induced boiling can be compared to the surface being dissolved by lasers. As a result of the quick cooling, bubbles are enclosed in the material. There is a noticeable uplifting effect from these bubbles.

There are longer pulses and modest power levels for the laser. In addition to polymers, foaming can also be used on certain metals. Dark or light marks may appear depending on the substance.


A carbonized item presents stark contrasts when compared to a bright one. Lasers heat the surface of materials and emit hydrogen, oxygen, or a mixture of these gasses during the carbonizing process. Eventually, a darkened region with a greater carbon concentration remains.

Color changes

Due to the color change of the material, the clarity is maximized. It reorganizes macromolecules by altering their orientation using an electrical method called laser color change marking. There is a possibility of color change with all polymers, and the change can be bright or dark. Dark color shifts are the most common.


The process of removing multilayered plastics is called removing. As a result of this process, the upper layers of the base object are removed by the laser beam. There is a contrast between the layers due to the color variances.

Plastic laser marking advantages

Industrial applications are becoming increasingly popular with laser marking due to its reliability and benefits. The application of this technology can also be of high quality. Besides being waterproof, chemically resistant, wear- and heat-resistant, and lightfast, it is also suitable for permanent marking purposes.

The marking can be customized and has maximum flexibility. It’s also suitable for locations that are hard to reach. In addition to being extremely durable, laser markings are also extremely difficult to mimic. This process involves no contact, so the tool does not wear out, and consumables such as inks, chemicals, and so forth are not used. Pre- and post-treatment are not necessary, and it is easy to handle.

Use of Laser Marking Machines: Some Key Points

  • Due to the machine’s size, ease of transport, and low volume, it can be used on the streets
  • There is no risk of skin injury when using laser marking equipment
  • 100 000 hours is the lifespan of a fiber laser source
  • There are no consumable parts on the lasers marking machine, and the warranty is three years. Despite not requiring any consumable parts for over ten years, it can operate indefinitely.
  • There is no learning curve when it comes to using the lasers marking machine. Speed, efficiency, and precision are all present in the marking process.

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Laser marking plastic types

There are a variety of marking types that can be achieved with short-pulse lasers based on their wavelength, material, and additives. Optimal clarity and marking quality can be achieved by mixing some industrial polymers with laser-sensitive additives. There is little change in the characteristics of plastics.

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