What Is CO₂ Laser Marking? Applications on Plastic, Wood, Leather and Organic Materials
CO₂ laser marking is one of the industrial laser technologies used particularly to create permanent markings on the surfaces of non-metallic and organic-based materials. Wood, leather, paper, cardboard, rubber, textiles and certain types of plastics are among the common application areas of CO₂ laser systems.
CO₂ laser technology can be used to apply logos, text, serial numbers, product codes, production dates, barcodes, QR codes or decorative patterns onto the material surface. Depending on the application, different results can be achieved, such as color change on the surface, controlled burning, engraving or removal of the top layer of the material.
In industrial production, selecting the correct laser system does not depend solely on the name of the material to be marked. The density of the material, surface coating, color, manufacturing method and targeted marking appearance can also affect the result.
For this reason, the actual production conditions of the application should be evaluated when selecting a CO₂ laser marking system. In Venox's laser marking solutions, the material, production volume, marking area, cycle time and automation requirements can be considered together.
How Does CO₂ Laser Marking Technology Work and Which Materials Can It Be Used On?
How Does CO₂ Laser Marking Work?
CO₂ laser systems generate a laser beam at an infrared wavelength through a laser source containing carbon dioxide gas. This beam is directed to the surface to be marked with the help of optical components, and when absorbed by the material, it creates a controlled change on the surface.
Depending on the structure of the material, the laser energy can create a color change on the surface, remove a thin layer or produce an engraving effect. The marking result is determined by laser power, scanning speed, frequency, focusing and the amount of energy applied.
CO₂ laser marking systems can provide advantages especially in mass production due to their fast and contactless operation. Since no physical mold or cutting tool is used during the process, different product codes or designs can be changed quickly through software.
CO₂ Laser Marking on Wood
Wood is one of the materials on which CO₂ laser technology is most commonly used. The laser beam can create dark-toned and permanent markings by generating a controlled thermal effect on the wooden surface.
Logos, text, patterns, serial numbers or decorative graphics can be applied to wooden surfaces. The application can be used in furniture, promotional products, packaging, decoration, wooden accessories and various industrial products.
However, not all types of wood produce the same result. The density of the wood, resin content, surface coating, grain structure and moisture level can affect the color and depth of the marking.
For this reason, the parameters to be used for natural wood, MDF, plywood or coated materials should be tested separately.
CO₂ Laser Marking on Leather
Natural leather and certain types of synthetic leather may be suitable for CO₂ laser marking. Laser technology can be used to apply logos, brand names, patterns or personalized information onto the leather surface.
Leather marking can be used particularly on shoes, bags, belts, wallets, textile accessories and promotional products.
The effect of the laser on the leather surface may vary depending on the type, thickness, dye and coating of the material. Dark contrast may be achieved on some surfaces, while other materials may produce a lighter or embossed-like appearance.
Especially for synthetic materials, it is important to know the material content specified by the manufacturer. Materials that are unsuitable for laser processing or that may generate harmful gases should not be used.
Laser Marking on Paper, Cardboard and Packaging Materials
CO₂ laser systems can be used on paper, cardboard and various packaging materials for product information, production dates, batch numbers or graphic applications.
In packaging applications, contactless marking can provide an alternative solution to mechanical printing systems. A laser system integrated into the production line can perform marking while the product is moving or when it stops at a specific station.
For materials sensitive to burning, such as paper and cardboard, laser parameters must be adjusted precisely. Excessive energy may cause unwanted burning or deformation of the material.
For this reason, marking quality and production speed should be evaluated together by performing a sample test before the application.
CO₂ Laser Marking on Plastic
Certain types of plastics can absorb CO₂ laser light effectively and provide successful marking results. However, plastics represent a very broad material group, and not every plastic is suitable for CO₂ laser processing.
Polyethylene, polypropylene, acrylic and various engineering plastics can react differently to the laser beam depending on their production formulations. In some applications, a color change may occur on the surface, while in others an engraving or melting effect may be observed.
For this reason, in plastic marking applications, the exact technical definition of the material should be known and testing should be performed on the actual product.
If the CO₂ laser does not provide sufficient contrast or precision on the plastic surface, fiber or UV laser technologies can be considered as alternatives.
What Should Be Considered When Selecting a CO₂ Laser Marking Machine?
Compatibility Between the Material and Laser Technology
The first factor to evaluate when selecting a CO₂ laser marking system is the material's response to the laser beam. Even two products within the same material family can produce different results due to different additives, pigments or coatings.
For this reason, it is not sufficient to select a system based only on general information such as “wood”, “plastic” or “leather”. Testing on an actual production sample helps determine the correct laser source and processing parameters.
When evaluating Venox's laser marking machines, selecting the appropriate technology for the application is one of the fundamental stages of system design.
Laser Power and Processing Speed
CO₂ laser systems can be configured with different power options. The required laser power depends on the type of material, marking depth, operating speed and production volume.
Higher power does not always mean better results. Excessive energy may cause burning, melting or unwanted deformation on the surface.
Especially on high-speed production lines, the correct balance must be established between laser power and cycle time. The system must be able to keep up with the speed of the production line without compromising marking quality.
Marking Area and Optical System
The size of the product to be marked and the marking area play an important role in the selection of the lens and optical system. While narrow and precise marking areas may be sufficient for small products, larger packaging or wooden surfaces may require a larger working area.
When selecting a large marking area, factors such as resolution, focus characteristics and beam intensity should also be evaluated.
In production processes where product height changes frequently, motorized focus adjustment or moving axes can also be used.
Difference Between Marking and Cutting
CO₂ laser technology can be used for both marking and cutting applications, but the system requirements of these two processes are not the same.
In marking systems, the objective is generally to create a fast and controlled mark on the surface. In cutting applications, the laser must pass completely through the material or process it to a specific depth.
For this reason, laser power, optical structure, motion system and working area can be designed differently depending on the application.
For cutting-focused applications, the laser cutting systems page can be reviewed.
Integration into the Production Line
CO₂ laser marking systems can be integrated into automated lines in high-volume production processes. After the product is detected by a sensor, the marking process can be started automatically.
Product codes, dates, serial numbers or batch information can be transferred from the central production system to the laser software. This allows dynamic and variable data to be applied to each product.
In applications with high conveyor speeds, marking time, the distance between products and the triggering structure of the system should be evaluated together.
If necessary, a camera system can be used to check the presence or readability of the marked code.
Ventilation and Occupational Safety
In CO₂ laser applications, thermal processing of the material may generate smoke, particles or gases. For this reason, an appropriate ventilation and filtration system is an important part of the application.
Especially in wood, leather and plastic marking processes, any smoke generated must be safely removed from the working environment.
The laser safety class of the machine, protective enclosure, emergency stop systems and other components related to operator safety should also be evaluated when selecting the system.
In laser marking systems designed for industrial use, safety is a criterion as important as production speed.
Why Is Sample Marking Testing Important?
Sample testing is recommended to determine how the CO₂ laser system will perform in the actual application. Different laser power levels, speed values and scanning strategies can be tested during the process.
Appropriate parameters can be determined by comparing criteria such as marking contrast, engraving depth, surface deformation, processing time and readability.
This stage is particularly important for plastic and coated surfaces because additives that are not specified in the material's technical documentation can alter the interaction with the laser.
Sample testing also helps determine the correct choice between fiber, CO₂ or UV laser technologies.
Industrial Applications of CO₂ Laser Marking
CO₂ laser marking systems can be used in packaging, furniture, leather, textiles, promotional products, plastics, electronics, wooden products and various consumer goods.
Branding and decorative patterns can be created on wooden surfaces, logos and personalization on leather products, batch or production information on packaging, and product codes on plastic parts using laser technology.
When correctly configured, CO₂ laser marking can be used both in standalone production stations and in automated production lines.
When evaluating Venox CO₂ laser solutions, material structure, marking area, production speed, automation requirements and safety requirements should be considered together.
To review different laser technologies and system options according to the application, you can visit the laser marking machines and systems page.
To obtain information about determining the CO₂ laser marking system to be used in your production, sample applications or project-specific integration requirements, you can contact Venox.
