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NEWS

Fundamentals of Laser Marking

5/15/2024

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by Laurie Barcaskey

This article was originaly written for the NTMA newsletter

Laser Marking Foaming effect on plastics
Laser Marking: Foaming effect on plastics
​If you are considering adding or upgrading your marking process, laser technology might serve you well. However, the investment requires doing some homework to ensure the system you choose will optimize your capabilities and allow room to grow. Whether looking for a dedicated workstation or integrating the marking into a production line, identifying the primary features to fit your budget need consideration. Finding the best partner to provide the solution becomes important. What one machine shop finds suitable for them does not always prove the best for another shop.

Laser marking offers more flexible technology over chemical etching, which it most commonly replaces. Programming through the software provides the ability to quickly change marking details without having to print a mask specific to each marking file. Upgrading from dot peen can prove beneficial, however for applications where stress fractures might be a concern, you may want to think again.

Understanding Marking Areas
Within the laser marking solutions you will find different power sources that are specific to the types of materials you need to mark. Fiber sources are most suited for metals and some plastics, while CO2 sources best serve organic materials like wood, leather, and glass, along with some other plastics. Applications where heat may impact the product, or high contrast is needed there are other specialized laser sources such as UV, Green, Mopa and Solid State.

When referring to laser marking systems, the "marking area" is the maximum surface area on which the laser can engrave, etch, or mark at one time. This area is crucial for determining the size of the designs or texts that can be applied without repositioning the material. The size of this marking area is largely determined by the lens that is used in the laser system.

Standard Marking Area
The industry standard for a marking area is often cited as 4 inches by 4 inches (approximately 102mm x 102mm). This size is suitable for a wide range of applications, offering a good balance between size and precision for many products and components. However, specific requirements can vary, and so laser systems are equipped with lenses that can offer both smaller and larger marking areas.

Role of the Lens
The lens in a laser marking system functions similarly to a lens in a camera or a magnifying glass. It focuses the laser beam to a precise point on the material's surface. The characteristics of the lens, including its focal length, determine the size of the marking area and how finely the laser can focus.
  • Smaller Lenses: These can focus the laser beam to a very fine point, allowing for detailed marking on a smaller area. They are ideal for applications requiring high precision and fine details.
  • Larger Lenses: Lenses designed to cover a larger marking area can focus the laser over a wider surface. While they allow for marking larger designs or texts, the focal point is less concentrated compared to smaller lenses. This means that while you can mark larger areas, the level of detail might be slightly reduced compared to using a smaller lens.

Impact on Focal Distance
The focal distance is the distance between the lens and the material being marked. It is critical for achieving clear, precise marks:
  • With larger lenses, the focal distance increases. This is because the lens needs to be further away from the material to correctly focus the laser beam over the larger area. A longer focal distance can lead to variations in the intensity and distribution of the laser's power across the marking area, which can affect the uniformity and quality of the mark.
  • Dispersing Power Differently: As the focal distance increases with larger lenses, the laser's energy can be dispersed over a wider area. This dispersion can result in variations in mark depth and quality, especially at the edges of the marking area. It's crucial to adjust the laser's power and speed settings accordingly to ensure consistent results across the entire marking area.
The choice of lens impacts both the size of the marking area and the quality of the marks produced. Understanding the relationship between the lens size, focal distance, and laser power distribution is essential for optimizing laser marking processes to achieve the desired outcomes on various materials and for different applications.
TG400 Laser Mark Plastic
Advantages of Laser Technology
Having the ability to achieve different mark results based on program settings makes laser technology attractive. Ranging from a light surface etch to deep engraving, and annealed marking for contrast you can meet the demands of identification for a multitude of applications with one system – a job shops dream come true. There are quite a number of advantage of using laser technology:
  • Versatility Across Materials - Laser technology's ability to work with a wide range of materials is one of its most significant advantages. From metals such as steel and aluminum to plastics, glass, wood, and even delicate fabrics, lasers can achieve precise marks without direct contact. This versatility makes laser systems indispensable in industries like automotive, aerospace, electronics, medical devices, and textiles.
  • Precision and Quality - Laser marking offers unparalleled precision, capable of producing highly detailed graphics, texts, and barcodes that are readable and scan-able, even at very small sizes. This precision ensures that even the most intricate logos, intricate patterns, and small font texts are clearly legible, meeting the high-quality standards required in industries like electronics, where component identification is crucial.
  • Programmable and Flexible - The ability to quickly change mark details through software programming enhances the flexibility of laser marking. This means you can switch between different marking designs or information without the need for physical tool changes, significantly reducing downtime and increasing production efficiency. It allows for the easy customization of products, making it ideal for short runs or personalized items, which is increasingly popular in consumer goods.
  • Durability of Marks - Laser marks are highly resistant to abrasion, heat, and chemicals, making them ideal for products that undergo harsh conditions, such as automotive parts, medical devices, and industrial equipment. This durability ensures that essential information, like serial numbers, safety warnings, and brand logos, remains legible over the product's lifespan.
  • Eco-Friendly and Safe - Compared to traditional marking methods, such as ink-based printing or chemical etching, laser marking is more environmentally friendly. It generates no consumables (like inks or acids) and minimal waste, contributing to a cleaner production process. Additionally, as a non-contact method, it reduces the risk of product damage and workplace injuries, aligning with safer manufacturing practices.
  • Cost-Effectiveness - While the initial investment in laser technology might be higher compared to traditional marking methods, the long-term benefits significantly offset the cost. Lasers have minimal maintenance requirements and consumable costs, leading to lower operating expenses over time. The efficiency and speed of laser marking can also increase throughput, further enhancing its cost-effectiveness.
  • Meeting Regulatory and Compliance Standards - Laser technology can produce high-contrast, permanent marks that are essential for compliance with international standards and regulations across various industries. This includes traceability codes, such as serial numbers and QR codes, which are critical for supply chain management, quality control, and safety recalls.


Picture
Software and Usability
Many of today’s lasers include user-friendly intuitive software that includes common navigation allowing beginners to get started quickly. This may include preloaded settings based on the type of material, preferred type of mark, and batch size. Typical marking details such as alpha/numeric characters and symbols are available in standard True Type fonts. The ability for marking bar codes increases to include 1D and 2D codes in a variety of formats, where programmable dot peen systems only allow for 2D codes. For more experienced laser programmers, the ability to access the background tools for deeper dives into the software may be the key factor when evaluating the software capabilities.

​Logo Importing and Data Entry
Importing logos is a frequent request. Most lasers will accept standard formats such as .jpeg, .bitmap and .eps, however some software platforms may require files be converted to a specific format. Job shops looking to expand through contract marking may face time spent converting file formats from what customers provide to what the laser will accept.

Entering the data into the software becomes important when the data changes often. To optimize the accuracy bar code scanning information from work orders removes transposing characters or placing data in the incorrect fields. Most software platforms will also allow entering data from spreadsheets optimizing throughput of items with multiple fields such as nameplates. Yet other times, interfacing with a host computer for data entry streamlines the data entry real-time.
Alphanumérique laser curve
An example of laser marking on a curved surface
Workstation Types and Safety
This leads to the types of workstations to consider, and safety is a key factor. For the sake of this article the focus is on a Galvo arrangement. A Galvo arrangement, short for "galvanometer arrangement," in the context of laser marking and engraving, refers to a system that utilizes galvanometer scanners to steer the laser beam across the target material's surface. These scanners contain mirrors that rapidly oscillate to reflect the laser beam in precise patterns, enabling the laser to etch, mark, or engrave with high speed and accuracy. This system contrasts with other types of laser positioning systems, such as gantry systems, which move the laser head or the workpiece mechanically over a fixed path.

Sometimes Gantry style laser systems are more favorable for large batches of small parts. In Galvo arrangements Class I enclosed workstations meet OSHA standards for light-tight environments protecting the operators and area workers from stray beams. Laser providers typically offer a standard enclosure, and some can build a customized cabinet. Third-party automation organizations can also assist with custom enclosures and installations.

Some key features of the enclosures to consider include the size and weight of parts being presented to the workstation, along with the access to the internal chamber. Manually operated, motorized and programmable doors are options with most laser suppliers. The ability to mark larger parts may require looking closely at the Z-axis, which is especially important to consider for proper focal distance. Options to automate the Z-axis are invaluable when part sizes change frequently and insure quick setup with accurate settings. While fixture requirements differ from impact marking, the tooling in laser applications assist with proper placement of the part for the marking process. Stability of the part during the marking process is more important than having it securely held. When available, T-slot bases offer the most flexibility for quick changeovers.


Some shops choose to work without the enclosure in a Class IV arrangement. While these workstations offer greater flexibility with part sizes, they present the need for extra attention to safety in the area the laser is set up. The operator should be equipped with safety lens to suit the wavelength of the laser source. Preferably Class IV arrangements are placed in an area enclosed with laser safety barriers, if not in a room dedicated to laser marking.
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Maintenance and Partner Selection
Another favorable feature of laser marking is the minimal maintenance requirements. By keeping the lens clean and the internal chamber of the enclosure free of debris and fumes from the marking process clear, legible mark results can be achieved consistently. A good air filtration system aids in this maintenance process.

​As you consider the partner for your project you want to explore the depth of their marking experience. Some partners are specific to laser marking, while others have a broader background in direct-part marking applications. The size of the organization will provide some indication of their ability to meet delivery and support post-sale issues. During the exploration period you will want to have test marking done on your materials and spend some time to be acquainted with their software. There are a lot of companies offering laser marking solutions, and like machine shops, they are not all the same. Choose wisely.
This article is part of the Fundamentals Series, a collection of in-depth guides covering essential marking technologies and processes. Explore the full series here to gain deeper insights into industrial marking solutions.
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Latest Hardware and Software Features of the Reiner Jetstamp 1025

5/14/2024

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 Reiner jetStamp® 1025 is the ideal solution for printing on large areas,
​such as pallets, cardboard or packaging.
compiled and edited by Bernard Martin
Reiner Jetstamp 1025
The Reiner jetstamp 1025 has emerged as a technological marvel, seamlessly integrating the latest hardware and software features to redefine efficiency, and versatility in handheld product identification.

Compact Powerhouse
The Reiner Jetstamp 1025 sets a new standard for handheld inkjet printers with its compact and lightweight design. Entirely without cables or a fixed location, this hardware innovation not only ensures portability but also enhances user comfort, making it an ideal solution for on-the-go marking needs. The ergonomic design reflects a careful consideration of user experience, offering a comfortable grip for extended use without sacrificing performance.
Reiner Jetstamp 1025 handheld inkjet printerThe jetstamp 1025's ergonomic design reflects a careful consideration of user experience, offering a comfortable grip for extended use without sacrificing performance.
Quick-Drying Ink Technology
One of the standout hardware features is the incorporation of quick-drying ink technology. The Jetstamp 1025's ability to produce swift and efficient imprints on various surfaces sets it apart. This innovation not only accelerates the marking process but also guarantees clean and smudge-free results, contributing to enhanced productivity. But is also has an integrated capping system to seal the print head which keeps ink from drying out even with longer breaks between uses.

User-Friendly Interface: Intuitive Controls for Seamless Operation
Navigating the complexities of marking technology becomes intuitive with the user-friendly interface of the Reiner Jetstamp 1025. The latest software features empower operators to set-up and initiate marking tasks with ease. The interface is designed for efficient programming, ensuring a seamless experience for users at various skill levels. The integrated display shows the set print image easily legible at all times! Reiner has  made several upgrades to software features that redefine versatility in marking capabilities. From product identification to date coding and batch numbering, this handheld inkjet printer adapts to diverse marking requirements. 

Wireless Connectivity
The Reiner Jetstamp 1025 embraces the future with its wireless connectivity capabilities. This hardware feature allows users to control and program the device remotely, offering unparalleled flexibility in marking processes across different settings. Print images can be transferred to the mobile marking device by Bluetooth or USB. The integration of wireless technology positions the Jetstamp 1025 as a forward-thinking solution for those companies seeking enhanced operational efficiency.

Reiner jetStamp 1025 is the ideal solution for printing on large areas, ​such as pallets, cardboard or packaging

Reiner jetStamp® 1025  Specifications

  • Imprint: Number, date, time, text, 1D Code & 2D Code sequential, graphic 
  • Prints from: PCset graphic, MOBILEset graphic, Word, Excel, Labelsoftware, ERP system such as SAP, Oracle, Microsoft Dynamics, Lexware
  • Display: Display available
  • Dimensions (L x W x H ):195 x 100 x 200 mm
  • Weight:ca. 900 g
  • Data transfer:USB, Bluetooth, WiFi/WLAN capable
  • Storable print images:255 storable print images
  • Print technology:Inkjet
  • Max. print area dimension (W x H):85 x 25 mm
  • Max. print speed:< 1 s/print
  • Print resolution:300 dpi
  • Battery capacity:up to 1.000 prints
  • Order No.1030 000-000 | jetStamp® 1025 incl. case
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