Why Does Excessive Powder Exist on the Clear Film of DTF?

Have you ever encountered this problem excessive powder when make the dtf film?

There are several elements causing this problem :

1. Transparent Pixels (White Underbase Issues)

Cause: In DTF printing, transparent areas (no white ink printed) should ideally have no adhesive powder applied. However, if the RIP software or image has false transparent pixels (e.g., semi-transparent or dirty white areas), the powder shaker may still apply glue to those areas. Also, if the white underbase is too thin or missing in certain zones, powder sits directly on the film's release coating, causing poor adhesion and residue after transfer.

Solution:

Ensure your RIP software correctly identifies true 100% transparent pixels (0% white ink).

Use a pure white underbase only where needed; avoid semi-transparent or soft-edge white that attracts powder.

Increase the white ink density slightly to help the powder bond to the ink, not directly to the film.

2. Shaker Speed (Powder Shaker Machine Settings)

Cause: If the shaker speed is too high, the vibration shakes excess powder off the printed areas, but some powder may be forced into non-printed (transparent) areas or not be removed evenly. If the speed is too low, excess powder stays on the film, leading to loose glue particles that remain after transfer.

Solution:

Adjust the shaker speed to a medium setting (typically 30–50% of max speed depending on the model).

Run a test: after shaking, the film should have no visible loose powder on transparent areas.

Ensure the vacuum/suction system (if available) is working properly to remove excess powder from non-printed zones.

3. Lower the Preheat Temperature (Curing Oven Settings)
Cause: If the preheat (curing) temperature is too low, the adhesive powder does not fully melt and bond to the white ink. Partially melted powder stays on the film surface instead of fusing into a solid film. During transfer, this under-cured glue splits — some transfers to fabric, some remains stuck on the film.

Solution:

Lower the preheat temperature is actually not recommended; instead, you may need to increase it. However, if your current temperature is too high causing other issues, lowering slightly might help — but normally, excess glue on film is due to under-curing.

Correct range: 150–170°C (300–340°F) for 2–4 minutes.

Measure actual surface temperature with an infrared thermometer. If it's below 140°C (280°F), increase temperature or time.

4. Moisture in Powder (Adhesive Powder Contamination)

Cause: Adhesive powder absorbs moisture from humid air or improper storage. Wet powder does not flow freely, clumps together, and does not melt evenly during curing. When pressed, the wet or partially cured powder sticks to the film rather than transferring to the fabric.

Solution:

Store powder in an airtight container with silica gel desiccant.

Keep the working environment humidity below 60%.

If powder is already moisture-affected, spread it thinly on a tray and dry it in an oven at 50–60°C (120–140°F) for 1–2 hours before use.

Replace old powder if clumping persists.

5. Tactic on the Film (Film Surface Issues & Strategy)

Cause: The term "tactic" here refers to the interaction strategy between the powder and the film surface. If the film's release coating is damaged, uneven, or incompatible, or if the film has static electricity, powder may stick to transparent pixels and not release after transfer.

Solution:

Use high-quality DTF release film with a proper matte/semi-matte coating.

Reduce static on the film by using an anti-static bar or lightly wiping the film with an anti-static spray before printing.

Do not touch the printing side of the film with bare hands (oils cause powder to stick).

After transfer, if glue remains on the film, re-press the used film onto a scrap piece of fabric or Teflon sheet — the remaining glue often transfers off.

Quick Troubleshooting Table:

After these settings, reprinting the file and done as below :