How do one-product-one-code labels enable end-to-end product traceability?

What Is One Product One Code

One Product One Code refers to assigning a unique digital identity identifier to each individual product. This identifier is typically presented on the label in the form of a QR code, barcode, or digital code. The data on each label is different—this is the core feature that distinguishes it from traditional batch-printed labels.

The technical foundation of One Product One Code is Variable Data Printing (VDP). According to common industry practice, enterprises generate and output encoded data streams on digital printing equipment, enabling each label to carry independent information. Digital printing presses such as HP Indigo can achieve different data output for each sheet, working in conjunction with a RIP (Raster Image Processing) system to merge variable data with fixed content in real time during the printing process.

Four Stages for Achieving Full-Chain Traceability

1. Code Generation: Establishing a Unique ID

Each product is assigned a globally unique code before leaving the factory. This code can be a serial number (such as 202607150001), an encrypted anti-counterfeiting code (a random code containing check digits), or a combination of GTIN (Global Trade Item Number) + serial number conforming to GS1 standards. The code is associated with basic information such as the product's production batch, production time, and production line number in a cloud-based database.

2. Label Printing: Variable Data Output

The encoded data is output onto self-adhesive labels through variable data printing technology. Unlike traditional printing where each sheet is identical, variable data printing retrieves the next set of codes from the database in real time during paper feeding, printing them one by one. Digital printing does not require plate-making, which is the economic prerequisite for achieving variable data. According to HP Indigo technical documentation, its LEP (Liquid ElectroPhotographic) technology can dynamically replace data during the printing process, achieving positioning accuracy of 1200 dpi, ensuring that even tiny QR codes are clearly readable.

3. Data Collection: Production Line Association

After the label is affixed to the product, scanning devices on the production line read the code, and the system automatically associates the code with the product's batch, production line, production date, and other information and uploads it to the cloud. This stage involves the "binding" operation between codes and product information, typically completed through PDA scanners or fixed code readers, with data synchronized in real time to the traceability platform.

4. End Query: Consumer Participation

Consumers scan the QR code on the packaging through tools such as WeChat or Alipay to view the full-process information of the product from raw materials to factory release. In accordance with the requirements of the GB 4806 series of food safety standards, food enterprises also need to include key data such as raw material sources and inspection reports in the traceability information. End query is not only a manifestation of consumers' right to know, but also drives enterprises to improve quality control in reverse.

Key Technical Points

The reliability of a One Product One Code system depends on three factors. First, codes cannot be mass-counterfeited—typically generated using encryption algorithms, combined with anti-copy label materials (such as fragile paper or VOID material), making the label invalid once torn off. Second, the database's concurrent processing capability—when the production line runs at high speed (hundreds of items per minute), scanning data must be written in real time without packet loss. Third, the precision of variable data printing—the QR code error correction rate is typically between 15% and 30%, but excessive printing deviation will cause scanning failures.

Current Industry Applications

One Product One Code traceability has been implemented in multiple industries including pharmaceuticals, food, agricultural products, and daily chemicals. In the pharmaceutical sector, electronic supervision codes (20-digit numeric codes) are implemented according to national requirements, while the food sector more commonly uses QR code scanning for traceability. The initial investment for enterprises establishing traceability systems mainly includes: database development (ranging from tens of thousands to hundreds of thousands of yuan), production line modification (scanning equipment + communication modules), and label costs (variable data labels cost 20%–50% more than ordinary labels).

Overall, the significance of One Product One Code traceability goes beyond meeting compliance requirements—it also enables enterprises to establish connections with every end consumer. Scanning data reflects the true circulation path of products, and this information has practical value for channel management and marketing decisions.