The coding method determines when and how a mark enters the package. Pre-printed information, manual coding, and inline coding solve different production problems. Start with whether the content changes, then check line speed, traceability requirements, and operator conditions.
How the three methods differ
Pre-printing happens during package printing and suits stable content such as the brand, ingredients, and fixed product information. Dates and batch numbers require a separate marking step when they must appear on each package.
Manual coding happens in the factory. An operator changes the date or batch information before or during a production run. It has low entry cost and can handle occasional changes, but speed and alignment depend on the operator and the line setup.
Inline coding is integrated with the packaging line. It can print dates, times, batch numbers, barcodes, or QR codes in sync with production. It suits continuous lines, frequently changing data, and codes that must remain readable for traceability.
Start with whether the content changes
If the package information stays the same for a long period, pre-printing can cover the fixed portion. Production dates, expiry dates, and batch numbers must still be generated during the packaging process. Those items are the reason to use manual or inline coding.
When content changes daily or by batch, compare more than the initial equipment price. The number of changes, operator workload, and error checks determine whether a manual process remains practical.
Check line speed and traceability requirements
- Can the line pace allow an operator to mark every package?
- Must a barcode or QR code be read reliably, and does the mark need to resist rubbing or tampering?
- Do the substrate, print area, and mounting position suit the intended equipment?
- Can the coder work with the existing packaging line or controls?
- Can the proposed solution be tested on real samples and accepted before production?
Selection checklist
A practical rule is to solve fixed information during package design and handle variable information at the production stage. Whichever method is selected, verify position, legibility, and adhesion on the actual package and content before production.