A code or label is only useful when it remains attached, legible and in the correct position throughout the intended use. Choose the face stock, adhesive, ink, ribbon, direct-marking method and inspection criteria against the actual bottle, pouch, cap, film or secondary pack.
Separate static artwork from variable production information
Static print normally covers approved artwork that repeats across a production batch. Variable information may include date, lot, time, line, product or traceability data. The variable-code method must fit the available print area, surface, line speed, product handling and required verification without obscuring existing artwork or mandatory information.
| Decision | Questions to answer | Trial observation |
|---|---|---|
| Surface | Material, coating, texture, curvature, contamination and condensation | Adhesion, ink wetting, smearing and contrast |
| Geometry | Flat panel, radius, seam, gusset, neck or unsupported film | Placement, distortion, wrinkles and print-head distance |
| Environment | Temperature, humidity, water, oil, chemicals, abrasion and light | Legibility and attachment after exposure |
| Line | Orientation, pitch, speed, trigger, encoder, dwell and reject method | Repeatability, missed codes and false rejects |
| Information | Content, character height, contrast, permanence and verification | Human readability and scanner or vision result |
Compare the main application routes
Pressure-sensitive label
Useful where pre-printed decoration and variable information can be carried on a label. Confirm face stock, adhesive, liner, roll direction, core, unwind, label gap and application surface.
Direct inkjet or thermal transfer
Useful for variable information on compatible surfaces or films. Confirm ink or ribbon suitability, print contrast, drying or transfer conditions, handling and cleaning.
Laser or other direct marking
Suitability depends on the exact material, coating, mark contrast, extraction and safety controls. A sample trial is required before specifying the result.
Integrate coding and inspection with the line
Record where the pack is controlled, how it is presented, what triggers the print, how speed is measured and where the result is inspected. Variable-height or unstable packs may need guides, a timing belt or another handling method. Define what happens after a missed, unreadable or incorrect code, including reject confirmation and production records where required.
Questions buyers ask about packaging print and coding
Which coding method is best for packaging?
The best method is the one that produces the required readable and durable mark on the actual surface at the required line conditions. Compare substrate, geometry, content, contrast, environment, speed, maintenance and inspection rather than selecting by machine name alone.
Why do packaging labels lift or wrinkle?
Common causes include incompatible adhesive, low surface energy, contamination, condensation, curvature, insufficient application pressure, label stiffness and movement after application. Inspect the failure timing and test the final container and environment.
Why does a date or batch code rub off?
The ink, ribbon or marking process may not match the surface or exposure. Cleaning residues, cure time, abrasion, moisture, oil and temperature can alter adhesion. Use a controlled sample and durability test rather than assuming a generic consumable will work.
Where should a variable code be placed?
Choose a stable, accessible area that remains visible and does not interfere with mandatory artwork, seals, folds or opening features. Confirm the pack can be presented consistently to the printer and inspection device.
Can a label or print choice affect recyclability?
Yes. Face stock, adhesive, ink, coverage, sleeve construction and consumer separation can affect the complete-pack assessment. Review the actual label-pack combination under the relevant UK methodology.
What should I send for a coding or label trial?
Provide the actual pack, artwork, code content, print area, line details, target output, environment and inspection requirement. Include current samples showing any adhesion, smearing, placement or readability problem.
For food and drink, mandatory information must meet the applicable legal requirements and remain clear and not misleading. Use the Food Standards Agency’s packaging and labelling guidance as the regulatory starting point.