Archive: Nov 2021

What Is a PCB Label?

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Electronic component labels on circuit board

Printed circuit board labels (PCB labels) help electronic equipment manufacturers keep track of PCBs during production, storage, and installation, ensuring they use the right components in their products. PCB labels are electronics labels that convey critical PCB information in an easily accessible format, including the PCB’s origin and lot numbers, test data, soldering temperature, and flux density.

Printed circuit boards (PCBs) are critical elements of electronic devices and systems, from computers and cell phones to medical devices and industrial equipment. By mechanically supporting and electrically connecting electronic components, they ensure electrical power and signals can flow where needed for the operation. However, they must be properly designed and installed to ensure they work as intended, which is why electronic equipment manufacturers often utilize printed circuit board labels.

The following article provides an overview of printed circuit board labels, highlighting why they are important, how to choose the right materials, and what solutions are available at Technicode, Inc.

Why PCB Labeling Is Important

PCBs labels are essential for traceability. They facilitate the tracking of PCBs throughout manufacturing, assembly, and distribution operations, ensuring the components proceed through the full production cycle, and the manufacturer integrates the right units into products. Overall, they can enhance a facility’s management capabilities and increase its production efficiency.

How to Choose the Right Materials for PCB Labels

Given their importance in electronic product manufacturing operations, PCB labels must be designed for long-term readability. The failure of a label means a PCB unit cannot be tracked through operations, which can result in manufacturing errors that waste time, money, and material. That’s why PCB labels are made from materials and with printing techniques capable of withstanding exposure to chemicals, extreme temperatures, wear, and other degrading conditions.
PCB labels can be made from a variety of materials, each of which offers varying levels of durability. The right material depends on when they are applied and what conditions to which they are exposed.

Applied at Start of Manufacturing Process

If the PCB label will be applied at the beginning of the manufacturing process, polyimide labels are an appropriate option. Polyimide labels use substrates and adhesives that are resistant to high temperatures, which allows them to withstand exposure to the elevated temperatures experienced during reflow and wave soldering operations.

Applied After Board Washing, Durability Expected

If the PCB label will be applied after board washing operations and durability is expected, polyester labels are an appropriate option. Polyester labels use substrates and solvent acrylic adhesives that can withstand exposure to IPA cleaning chemicals.

Applied After Board Washing, Durability Not Expected

If the PCB label will be applied after board washing operations and durability is not expected, paper labels are an appropriate option. Paper labels use adhesives that may dry out, so they can fall off over time.

PCB Label Solutions at Technicode

At Technicode, we are a premier source for high-quality barcode labeling supplies. We offer a broad selection of products to meet the needs of our customers. Our PCB label offerings include:

Duratran™ Gloss White Polyester Electronic Component Labels

This topcoated white glossy polyimide film is coated with an aggressive permanent acrylic adhesive.

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Duratran™ Gloss Polyimide Electronic Component Labels

These film labels employ a permanent adhesive that’s designed for use in extremely high temperature environments. They are commonly used to label printed circuit boards.

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Order PCB Labels From Technicode, Inc. Today

Want to learn more about PCB labels? Ask the barcode label experts at Technicode! We’ve supplied premium thermal transfer printing media, including for PCB labels, for over two decades, so we can answer or address any questions or concerns you may have about these products. We can also provide standard or custom label solutions, with or without printing, for your applications. For additional information about our PCB labels and other quality products, contact us or request a quote today.

What’s the Difference Between Thermal Transfer and Direct Thermal Printing?

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Thermal Transfer Labels

Thermal printing uses one of two processes: thermal transfer or direct thermal printing. Both methods are similar in that they use a thermal printhead to apply heat to a surface. However, direct thermal printing requires chemically treated, heat-sensitive material, and thermal transfer printing uses a heated ribbon to transfer images onto a wide range of materials.

In both methods, a printhead containing small heating elements delivers heat to specific areas to produce an image. The resolution of the image is determined by the arrangement and number of heating elements, or dots per inch (DPI), in both methods. The higher the DPI, the better print resolution and quality produced. The main difference between the two methods is the printing surface, which we will detail further below.

Thermal Transfer Printing

To choose the best thermal printing technique for a given application, it’s necessary to have a basic understanding of the functionality of each method. Let’s take a closer look at how thermal transfer printing works and its unique advantages.

How Does a Thermal Transfer Printer Work?

Thermal transfer printing uses heating elements located in a printhead to deliver punctual heat to a passing ribbon. The ribbon melts onto a label forming the printed image. The label absorbs the ink to apply the image to the media. In this type of thermal printing, both the ribbon and label stock must be carefully chosen. The material and adhesive qualities of the label and ribbon must be well matched to achieve prints that are of the highest quality and durability. Choosing the correct materials allows the final product the ability to withstand chemical and UV exposure, extreme temperatures, robust cleaning procedures, and more.

Advantages of Thermal Transfer Printing

Thermal transfer printing achieves crisp, high-definition images, text, and graphics that boast maximum readability, scannability, and long-life image stability. Both single and batch printing can be performed while producing virtually no waste, and nearly any media can be printed. Thermal transfer printers are more durable than conventional printers affording your application more reliability and lower maintenance costs.

Applications of Thermal Transfer Printing

Thermal transfer printing is compatible with a virtually unlimited variety of media stock, making the applications for this printing method just as diverse and applicable to many industries. Some common applications include:

  • Circuit board tracking
  • Asset tagging
  • Inventory identification
  • Cold storage
  • Outdoor applications
  • Certification labels
  • Marking laboratory specimens

Direct Thermal Printing

In direct thermal printing, the image is applied directly to the material as opposed to a ribbon as in thermal transfer printing. The following sections will explain how direct thermal printing works, its key advantages, and its most suitable applications.

How Does Direct Thermal Printing Work?

In this technique, the heating elements in the printhead apply punctual heat directly to a label featuring a heat-sensitive coating. The chemicals in this coating cause a reaction that changes the label color from white to black in the areas where heat is applied. Direct thermal printers are simpler in design than thermal transfer printers because they do not require a ribbon.

Advantages of Direct Thermal Printing

This method produces images that scan well and can be used with recyclable materials. This method is ideal for applications in which the image does not need to last long, such as receipts or shipping labels. Direct thermal printers are easy to operate since they do not use ink or toner. They produce virtually no waste and have low, long-term maintenance costs as they are very durable and don’t have supplies that need to be replenished.

Applications of Direct Thermal Printing

Thermal Transfer vs. Direct Thermal Printing

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The labels used in direct thermal printing are extremely sensitive to heat, light, and other environmental conditions. As such, common applications include items typically used or stored indoors, such as:

  • Receipts
  • Tickets
  • Visitor identification for hospitals or schools
  • Shipping labels
  • Pharmacy Labels
  • Food Labeling Labels
  • Restaurant Order Labels
  • Barcodes

In Need of a Thermal Transfer or Direct Thermal Labels?

Technicode, Inc. has been a reliable source for thermal printing supplies for over 20 years. Our products are compatible with all the leading thermal printer brands and we also develop custom-sized labels, with or without printing. Thermal printing media by Technicode is proudly made in the USA and always ships quickly. If you have questions about which printing method is right for your application, please contact us. If you know which labels you need for your application, request a quote today to get started.