Inkjet Printing on Flexible Packaging: Materials, Challenges & Solutions

Introduction

Flexible packaging such as PE, PP, PET films and laminated materials is widely used in food, beverage, pharmaceutical and consumer products. However, its smooth, non-porous and flexible surfaces can make consistent ink adhesion and print quality difficult.

So, what should you consider when printing text, barcodes, QR codes and variable data on flexible packaging?

What is flexible packaging？

Flexible packaging refers to packaging made from materials that can bend, fold or conform to the shape of the product.

Common Flexible Packaging Materials

Common flex packaging formats

1. ·  Stand-up pouches
2. ·  Sachets
3. ·  Pillow bags
4. ·  Flow-wrap packaging
5. ·  Plastic film
6. ·  Laminated packaging
7. ·  Flexible food packaging

Why is printing on flexible packaging difficult?

Non-porous surfaces

While ordinary paper absorbs some ink, the surfaces of films made from materials such as PE, PP, and PET do not absorb solvents or ink; their smooth surfaces reduce mechanical adhesion.

Glossy and smooth surfaces

Glossy film surfaces cause liquid ink to pool or bead instead of spreading smoothly, leading to several common issues: Poor wetting & ink beading, weak adhesion, smearing, low contrast.

Flexible films can move or wrinkle

Unlike rigid cardboard, thin films are unstable under line tension, causing: film movement and vibration, wrinkles and curling, fluctuating printhead distance.

High-speed production lines

High-speed packaging lines require more than just a faster printer. You also need to balance speed and resolution, fast drying and adhesion, encoder synchronization.

What information needs to be printed on flexible packaging?

Product & Traceability Information

1. Manufacturing dates
2. Expiration dates
3. Batch numbers
4. Lot numbers
5. Product codes

Variable Data

1. Barcodes
2. QR codes
3. Serial numbers
4. Variable text

Product Information

1. Ingredients
2. Instructions
3. Small text
4. Regulatory information

Which inkjet technology is suitable for flexible packaging?

PIJ vs. CIJ vs. TIJ for flexible packaging

*The specific performance depends on the equipment, ink, substrate, and production line.

Why use high-resolution PIJ printing for flexible packaging?

High-resolution text and codes

Delivers sharp, legible output for small text, fine characters, high-density barcodes, and QR codes to ensure 100% scan reliability.

Flexible Print Content

Seamlessly updates dynamic data in real time, including manufacture dates, batch codes, detailed product information, and variable codes.

Non-Contact Printing

Protects delicate films and flexible pouches from distortion or damage by applying ink without physical contact.

Multiple Print Heights

Offers versatile printhead configurations to match diverse package sizes and multi-line content requirements.

Integration Into Automated Packaging Lines

Functions as a complete inline solution—combining printer, encoder, and sensor—to sync effortlessly with your existing packaging machinery.

Conclusion

Printing on flexible packaging is not simply a matter of choosing a high-resolution printer. The substrate, surface treatment, ink adhesion, drying performance, print speed and production-line conditions all affect the final result.

For manufacturers that need high-resolution text, barcodes, QR codes and variable data on flexible packaging, a PIJ inkjet solution can be considered when the printer, ink and substrate are properly matched.

Need to Test Your Flexible Packaging?

Send us your packaging samples. Our team can test print quality, ink adhesion and code readability to help identify a suitable high-resolution PIJ solution.