Why Powderless DTF Is a Systems Challenge, Not Just a Liquid TPU Problem

Powderless DTF printing is gaining attention as an alternative to traditional TPU powder systems. But replacing powder with a liquid TPU adhesive is not just a formulation challenge; it’s a full systems problem involving printers, inks, resins, and drying.

The problem: Many companies are trying to replace powder with one liquid TPU adhesive and one additional printhead.

The real solution: a collaborative systems approach.

Printer Manufacturer

• Two rows of heads for the liquid TPU adhesive may be necessary to achieve adequate film build and adhesive mass.

• An enclosed print zone with climate control will allow the ink formulator to reduce humectant levels in both the inks and the liquid TPU adhesive.

• High-viscosity printheads may improve adhesive deposition and reduce the number of required heads.

  
  

Printhead Supplier

• Assist in head selection for the printer/ink/liquid TPU

• Waveform optimization

• Collaborate with printer on fluid delivery system, print zone, jet plate, climate management

Ink Formulator

• Reduce humectant levels as allowed by the printer’s enclosed print zone.

• Reformulate inks to include more polyurethane functionality. Many current DTF inks rely too heavily on powder TPU for the final transfer properties beyond color.

• Work closely with resin suppliers to ensure compatibility between the inks and liquid TPU adhesive, while optimizing final transfer properties.

Resin Supplier

• Many inkjet-grade polyurethane dispersions already exist, but suppliers need to help optimize for:

  • adhesion

  • soft hand feel

  • jetting stability

  • drying speed

  • film build

  • wash durability

  • heat activation behavior

Dryer / Integrator

• Printer manufacturers and third-party integrators need to work closely with the ink manufacturer and resin supplier to optimize:

• dryer size

• heat profile

• airflow

• dwell time

Work is already quietly underway. The winning solution will come from the team that best embraces the full systems approach.

If you’re working on DTF, inkjet coatings, or polyurethane systems and want help developing formulations or evaluating materials, feel free to reach out.