In manufacturing, coding and marking turns product information into readable text, barcodes, or both. Define the product data before setting up the printer. A GS1 GTIN-13 contains 13 digits. The first 12 form the item reference, using a GS1 company prefix and item reference; their lengths vary. The final digit is a check digit calculated from the first 12. Small detail, big consequences. A wrong digit can disrupt scanning and traceability.

On a production line, the chosen data is sent to a coding device and applied to each pack. Operators should verify the first prints after a changeover, then recheck at sensible intervals. Record what was checked and when. In practice, setup sheets can become outdated, so review them when packaging or product details change. Even a clear code may fail if its placement is hidden by a seam or label. Verify visibility under real handling conditions.

On a manufacturing line, coding and marking add readable identity to products and packaging as they pass a print station. A date, lot number, or serial code can go on a bottle, carton, pouch, label, or shipping case. The right method depends on the surface, line speed, and handling conditions. Small details matter.

Thermal inkjet systems work well on many porous cartons, while continuous inkjet can mark varied surfaces at production speed. Laser marking creates a permanent mark without ink, but material compatibility and contrast should be tested first. Operators set the code format, position the printhead, and check samples at normal line speed. A sensor can trigger each mark as an item passes. Timing drift may shift the code.

A reliable process checks more than whether a mark appears. Teams inspect legibility, placement, and data, using vision systems or manual sampling to catch missing or incomplete codes. They also clean printheads, monitor supplies, and record settings when products change. Cameras can miss problems when glare, dust, or uneven packaging affects inspection. No setup stays perfect forever. Regular checks help reveal faults before they affect a full batch.

A code may look sharp on a carton and still fail at the scanner. ISO/IEC 15416 assesses linear barcodes, while ISO/IEC 15415 evaluates two-dimensional symbols. Both use a 0-to-4 quality scale, where higher grades indicate stronger print quality. The standards examine features such as contrast, defects, and whether the symbol can be decoded. GS1’s Barcode Verification Process Implementation Guideline recommends using a calibrated verifier, not relying on a handheld scanner alone.

Looks fine. Not enough.

On a production line, verify samples from real packaging, including glossy labels, curved containers, and freshly printed cartons. For linear codes, ISO/IEC 15416 measures multiple scan paths; for 2D codes, ISO/IEC 15415 assesses the captured symbol image. Record the grade, verifier settings, print speed, and substrate so teams can compare results across runs. A good grade is useful, but it does not prove every reader will succeed under every lighting or handling condition. That limitation is easy to overlook. Check again after changing ink, label stock, or printer settings, and keep marginal results visible rather than averaging them away.

In manufacturing, a code becomes useful when it links a physical item to reliable production records. A GS1 DataMatrix can carry an item identifier, batch number, and date in a compact symbol. GS1’s General Specifications list a maximum capacity of 2,335 alphanumeric characters. That is a ceiling, not a sensible target for every package. Symbol size, print quality, and scanning conditions matter. On a moving line, a blurred edge or weak contrast can turn a detailed code into an unreadable one.

The link to traceability depends on what the code connects to. A scan can retrieve batch history, inspection results, and packaging details from a production system. GS1’s traceability guidance emphasizes recording key events and their associated data, rather than relying on a code alone. A 2019 Smart Factory study reported that 86% of surveyed manufacturing executives saw smart factory solutions as a future competitiveness driver. Still, digital records are only as dependable as their inputs. It is tempting to encode everything. I would question that. A shorter, verified data set may scan more consistently and help operators find the right record faster. The mark should be tested on the actual line, under real lighting and handling conditions. Small print defects matter.