Barcodes have quietly become a requirement for anyone selling through modern retail, e-commerce or large distributors. More recently, QR codes have joined them, used for everything from product information to authentication and traceability. For manufacturers, getting these codes right is not only a design task but also a production one, because a code that does not scan creates problems all the way down the supply chain.
The Role of GS1 Barcodes
Most retail barcodes follow GS1 standards. A product receives a unique Global Trade Item Number, usually printed as an EAN-13 barcode on consumer packs. Retailers and marketplaces use this number to identify products at checkout and in inventory systems. In India, companies obtain these numbers through GS1 India, which allocates a company prefix.
Outer cartons often use different barcode formats, such as ITF-14, to identify cases of products.
Printed With the Artwork or On the Line?
Static barcodes that identify a product are usually printed as part of the label or pack artwork. Variable codes, such as those containing batch numbers, serial numbers or expiry dates, must be printed on the line by a coding machine. As traceability expectations grow, more manufacturers are adding variable codes to their packaging.
QR Codes and 2D Codes
QR codes and GS1 DataMatrix codes store much more information than a linear barcode. They can hold a product code, batch, expiry date and a unique serial number in a small area. Consumers can scan QR codes with a phone to reach product information, usage instructions or authenticity checks. Pharmaceutical companies use 2D codes extensively for traceability.
Choosing Equipment for Variable Codes
- Thermal inkjet printers produce sharp 2D codes on cartons and labels.
- Thermal transfer overprinters work well on flexible film and labels.
- Laser coders can mark codes permanently on suitable surfaces.
- Print-and-apply labellers print a fresh label and apply it to cartons or pallets.
The choice depends on the surface, speed and required resolution.
Verification Matters
A barcode that looks fine to the eye may still fail to scan. Contrast, size, quiet zones and print sharpness all influence readability. For critical applications, a camera-based verification system after the printer reads every code and rejects packs with unreadable or incorrect data. This is especially important where serialised codes are linked to a database.
Design Tips
- Keep barcodes at the recommended size; do not shrink them to fit artwork.
- Use dark bars on a light background for best contrast.
- Avoid placing codes over seams, curves or folds.
- Leave a clear area around the code.
Integrating With Your Systems
Variable codes often come from an ERP or production management system. The coder or line controller receives the data for each batch, reducing manual entry and errors. Even small factories benefit from linking batch data automatically rather than relying on operators typing it each time.
Common Scanning Problems to Avoid
Red bars on any background, codes on reflective metallised film and codes printed across a pouch seal are frequent causes of scanning failures. Test printed samples with an ordinary retail scanner before approving artwork.
Looking Ahead
Retailers, regulators and consumers increasingly expect products to be traceable. Investing in reliable coding and verification now prepares your packaging line for future requirements.
Hilden helps manufacturers add coding and inspection equipment to existing lines, so barcodes and QR codes are printed clearly and verified before products leave the factory.
