Production Line Date Code Marking: Expiration, Batch, and Traceability on Packaging
Permanent expiration dates, lot codes, and batch numbers on food, pharmaceutical, and cosmetic packaging. No consumables, no downtime for cartridge changes, full FDA traceability.
The FDA in one sentence: 21 CFR 211.137 requires expiration dates on drug products. All infant formula must carry expiration dates. Food traceability, while not always an FDA expiration date requirement, needs product code or lot number for FSMA compliance. Laser coding is the production-line standard because it cannot smudge, smear, or be wiped off the way inkjet codes can.
Why laser replaces inkjet on production lines
Inkjet coders dominated date and lot marking for decades. Most lines that ran in 2010 are running laser by 2026. Three reasons.
No consumables. Inkjet eats ink cartridges and ribbons constantly. A high-speed line burns through hundreds of dollars in consumables per week. Laser uses electricity. Five years of laser operation costs less than one year of inkjet consumables on a high-volume line.
No downtime for refills. Inkjet requires stopping the line to swap cartridges. Laser runs continuously. For a line that does $5,000/hour in finished product, every minute of downtime matters.
The mark cannot be tampered with. Inkjet ink can be wiped, scratched, or chemically removed. Laser engraves the packaging itself, etching plastic, marking glass, ablating coating on metal cans. The mark is part of the package, not a coating on it. This is critical for product authentication and counterfeit prevention.
Which laser for which packaging material
| Packaging material | Best laser type | Our power tier | Notes |
|---|---|---|---|
| Plastic bottles (PET, HDPE) | UV | 5W to 20W UV | Cold marking, no thermal damage |
| Glass bottles (clear or colored) | UV | 5W to 20W UV | Frosted permanent mark, no cracking |
| Aluminum cans | Fiber | 20W to 30W Fiber MOPA | Marks anodized layer for contrast |
| Steel cans (food) | Fiber | 20W to 30W Fiber MOPA | Annealed black mark on uncoated steel |
| Paper / cardboard cartons | CO2 | CO2 galvo (coming soon) | Engraves through paper into the substrate |
| Plastic film / flexible packaging | UV or CO2 | 5W UV recommended | UV cleaner mark on thin film |
Industries running laser date marking today
Food and beverage
Tetra Pak runs JPT UV and fiber lasers in their packaging machinery for permanent batch and expiration coding. Bottled water, dairy products, packaged foods, beverages. FSMA traceability without ink-mess on the production floor.
Pharmaceutical
Vial-by-vial serialization for drug authentication, FDA 21 CFR 211.137 expiration date compliance, batch traceability for recall management. UV laser is the standard because pharmaceutical vials are glass; the mark must survive autoclaving and chemical exposure.
Cosmetics and personal care
Batch coding on plastic and glass containers. Premium brands often use laser-marked dates because inkjet looks cheap on a luxury package. Anti-counterfeiting marks via QR codes that link to authentication databases.
Industrial and automotive parts
Manufacturer date codes on automotive components, electronic device serialization, and date-of-manufacture marks on industrial parts. Aluminum, plastic, and coated metal substrates, all handled by appropriate laser.
Production line integration
A laser coder mounted on a conveyor needs three things: conveyor signal input (when to fire), variable text data (current date, current lot), and exhaust extraction (the marked material vaporizes a small amount of material that needs to be evacuated).
Our UV and fiber lasers come with TCP/IP and I/O interfaces standard for line integration. EZCad 3 software supports variable text from a database, automatic incrementing serial numbers, and barcode/QR code generation. For an existing line, integration typically takes 1-3 days with our remote support team via video call in your language.
Frequently asked questions
What’s the maximum line speed the laser can handle?
Depends on mark complexity. A simple 6-digit date code can mark on packages moving at 60+ meters per minute (~1000+ packages per minute on small packages). Full barcode or QR codes slow that down to 100-300 packages per minute. Send us your line spec and we recommend the right power and beam delivery option.
Do we support FDA UDI (Unique Device Identification) for medical devices?
Yes. UDI marks on medical devices are typically annealed or deep-engraved on stainless steel, our fiber MOPA M7 handles this. For UDI on plastic surgical packaging, our UV laser is the right tool. FDA 21 CFR Part 830 compliance support including the data carrier formats (linear barcode, 2D barcode, human-readable).
What’s the total cost of ownership compared to inkjet?
Inkjet consumables for a moderate line run $10,000 to $30,000 per year. Laser has zero consumables, pure electricity (about $200 to $500/year). Add labor saved from not changing cartridges, and the laser typically pays back its purchase price in 1-3 years and runs at near-zero cost for the remaining 10+ year machine life.
Can the laser be integrated into our existing PLC / SCADA system?
Yes. Our lasers expose I/O signals, TCP/IP commands, and optional fieldbus protocols (depending on configuration). Integration with Allen-Bradley, Siemens, and Mitsubishi PLCs is standard. Custom protocol support available via firmware customization on request.
