Online TIJ for Medical Device Blister Packaging: Achieving UDI-Compliant 2D Codes

By Meenjet Application Engineering Team | September 29, 2026

Executive Summary

Medical device blister packaging presents a specific coding challenge: printing UDI-compliant 2D codes on heat-sealed foil or Tyvek lidding—at production speeds, without damaging the seal.

The FDA's UDI system (21 CFR Part 830) and the EU MDR 2017/745 require a Unique Device Identifier on most medical devices. For blister-packed devices, this means a machine-readable DataMatrix code, often with module sizes of 0.3 mm or smaller.

Online Thermal Inkjet (TIJ) systems meet this requirement—but only with the right nozzle configuration, ink, and encoder synchronization. This guide covers the UDI requirements, the three coding challenges specific to blister packaging, and how the Meenjet MX PLUS and MX PRO handle medical device production.

???? For Medical Device Packaging & Compliance Managers

1. UDI Requirements for Medical Device Blister Packaging

Both the FDA and the EU require a Unique Device Identifier on most regulated medical devices. For blister-packed devices, this means:

Key insight: The code must remain readable after sealing, during packaging, and through the product's shelf life. Ink smudging or partial transfer to the blister cavity is a compliance failure.

Glossary: The X-dimension is the width of a single module in a 2D code. GS1 standards recommend a minimum X-dimension of 0.254 mm for direct part marking (DPM) and 0.380 mm for printed labels.

2. Three Coding Challenges in Blister Packaging

Challenge 1: Heat-Sealed Lidding Surfaces

Blister lidding is typically aluminum foil or Tyvek (medical-grade HDPE fiber). Both surfaces have low surface energy—similar to HDPE containers. This makes standard inks bead up instead of adhering.

Directional tuning:

• Use solvent-based fast-dry ink: Formulated for low-energy surfaces

• Verify surface energy: Use a Dyne pen to check. A reading of ≥38 dyn/cm indicates the surface will accept ink. If below, corona treatment may be required

• Maintain 2–3 mm throw distance: The gap between the printhead nozzle and the substrate. A shorter gap prevents droplet divergence on curved or textured lidding

Challenge 2: Small Module Sizes at Production Speed

UDI codes on blister packs are often smaller than 8×8 mm. At 150–200 m/min, this requires high Y-axis resolution.

Directional tuning:

• Enable dual-nozzle mode: Achieves 600 DPI on the Y-axis—no additional hardware required

• Use the minimum throw distance: 2 mm for maximum droplet placement accuracy

• Verify encoder synchronization: Pulse-per-mm must be calibrated at production speed

Challenge 3: No Damage to the Seal or Product

Blister packaging is sealed under heat and pressure. Any thermal or mechanical stress from the coding process can compromise the seal or the product.

Directional tuning:

• Use TIJ, not laser: TIJ is a non-contact, ambient-temperature process—it transfers no heat to the seal

• Avoid physical contact: TIJ printheads do not touch the substrate

• Use fast-dry ink: Prevents ink transfer to the blister cavity during stacking

3. Why Online TIJ Fits Blister Packaging

4. Parameter Tuning Matrix by Lidding Material

Note: GS1 standards recommend a minimum X-dimension of 0.254 mm for direct part marking (DPM) and 0.380 mm for printed labels. For UDI codes at the lower end of this range, dual-nozzle mode (600 DPI Y-axis) is recommended.

5. Achieving ISO/IEC 15415 Grade A on Blister Lidding

UDI codes must be verified against ISO/IEC 15415. The thresholds for Grade A are:

Tuning for Grade A:

• Increase contrast: Use high-opacity pigmented ink (for dark lidding) or standard solvent ink (for light lidding)

• Improve modulation: Reduce throw distance to the minimum (2 mm); verify nozzle alignment

• Minimize grid distortion: Ensure the encoder is synchronized and the lidding is flat at the print zone

6. Meenjet MX PLUS and MX PRO for Blister Packaging

Selection rule: For lines below 120 m/min with a single lane, MX PLUS is sufficient. For lines above 120 m/min, multi-lane configurations, or direct PLC integration, MX PRO is the appropriate choice.

Both models support dual-nozzle mode—the same printhead fires left and right nozzles in an interleaved pattern to achieve 600 DPI on the Y-axis. No additional hardware is required.

Technical boundary: The MX PLUS and MX PRO are capable of UDI-compliant DataMatrix coding on blister lidding, verified through internal application testing. However, final validation must be performed on your specific lidding material, ink, and production conditions. We recommend a free sample test before production commitment.

For complete specifications, visit the MX PLUS / MX PRO product page.

Frequently Asked Questions (FAQ)

Q1: Can TIJ print UDI-compliant DataMatrix codes on blister lidding?
A: Yes. With dual-nozzle mode (600 DPI Y-axis) and solvent fast-dry ink, TIJ achieves ISO/IEC 15415 Grade A on aluminum foil and Tyvek lidding.

Q2: Does TIJ damage the heat-seal layer?
A: No. TIJ is a non-contact, ambient-temperature process. Unlike laser coding, it does not transfer heat to the seal or the product.

Q3: What module size can be achieved?
A: With dual-nozzle mode, module sizes down to 0.254 mm are achievable, in line with GS1 standards for direct part marking.

Q4: Is corona treatment required for Tyvek or foil lidding?
A: Not always. Verify surface energy with a Dyne pen. If below 38 dyn/cm, corona treatment may be required for optimal ink adhesion.

Q5: Can the printer integrate with an existing blister line?
A: Yes. The MX PLUS and MX PRO mount over the existing conveyor and synchronize with the line encoder. MX PRO also supports Modbus-TCP for direct PLC integration.

Q6: What is the minimum order for a free sample test?
A: No minimum. Send us your lidding material, and our engineers will test the optimal parameters and return a report within 5 business days.

Q7: How does TIJ compare to TTO for blister packaging?
A: The two technologies serve different needs:

Rule of thumb: For blister lines running above 100 m/min with small UDI codes, online TIJ is the better choice. For slower lines with larger text, TTO remains cost-effective.

???? Send Us Your Blister Lidding for a Free Sample Test

Send us your blister lidding material. Our engineers will:

1. Test the optimal ink and nozzle configuration for your lidding

2. Print a UDI-compliant DataMatrix code and verify against ISO/IEC 15415

3. Recommend the right MX-series model for your line speed

No obligation. Report delivered within 5 business days.

???? Request a Free Sample Test

Related Technical Resources

• ISO/IEC 15415 Grade A GS1 DataMatrix: TIJ vs. CIJ vs. Laser Tuning Guide

• Medical Device Marking: FDA UDI Compliance on Stainless Steel & Titanium

• Online TIJ Coding for High-Speed Lines: Achieving Grade A DataMatrix on Flexible Packaging

• MX PLUS / MX PRO Online TIJ Product Page

About the Author

Meenjet Application Engineering Team — Over 15 years of combined field experience supporting online TIJ installations across medical device, pharmaceutical, food, and industrial packaging lines. Our team has resolved hundreds of UDI compliance, adhesion, and grade-verification issues on blister and flexible packaging.

Reviewed by: Senior Online TIJ Application Engineer, Meenjet
Last Updated: September 29, 2026