1-D and 2-D Code Printing and Marking Methods
Every code application begins with collecting information from a central database, which often includes the origin and other manufacturing data, and then applying that data to an object. The application of the code is usually accomplished in one of two ways: by applying the code to a package or label, usually using inkjet or thermal printing methods, or by permanently marking the code directly on a part via direct part marking (DPM) methods such as dot peen, chemical etching, or laser marking.
Thermal Transfer and Inkjet Printing
Direct Part Marking
For many applications, such as medical devices, automotive and other durable goods where traceability and liability protection at the component level are important, DPM methods offer a longer-lasting alternative compared to printing methods. DPM solutions will typically include more data than just a part index number; therefore, they often use 2-D codes instead of lower-bandwidth 1-D barcodes.
Depending on the material being marked, each method has its own strengths and weaknesses. For metal parts, laser-marking systems offer high-throughput permanent marks but are costly to install. Dot peen marking heads are less expensive but they wear down, which can compromise the mark. Interestingly, some vision-enabled code reading systems can monitor the quality of printers and DPMs, alerting machine operators to clogged print or worn marking heads.
Dot Peen Marking
Related Content Introduction to barcode reading
- What is a Barcode
- How are Barcodes Used
- 1-D Barcodes
- 2-D Matrix Codes
- Printing and Marking Methods
- Laser Scanners
- Vision-enabled Barcode Readers
- Selecting a Reader