Digital apparel printing guide: DTG, DTF, pretreatment, white ink, transfer, cure, and maintenance

What to take away

Digital apparel printing turns a file into droplets and then into a finished print through chemistry, placement, heat and pressure. DTG and DTF share an inkjet head. Everything after the head differs.

Two process paths that do not interchange

In DTG the garment sits on a platen, gets pretreated for that ink and fabric, is printed, then cured. Ink meets fiber, texture and finish while it is still wet.

In DTF the color and white inks land on film in a set order. Powdered adhesive goes on, excess comes off, and the film is processed before it ever touches cloth.

Sublimation is a third path. It drives disperse dye into polyester or a polymer coating. DTF bonds a printed adhesive film to the fabric. Sharing transfer media does not make them the same process.

Files and the white channel

Log the artwork, final dimensions, pixel dimensions, transparency, and color mode.

Soft shadows, low-opacity edges and transparent pixels can change once a white layer is generated. Check the color channel and the white channel separately.

Print a target with solids, gradients, fine type, neutral values and white-to-color edges. Add skin tones if the line prints them. The target is the reference you compare against when a reorder looks wrong.

Qualify the garment before the run

Keep collars, pockets, zippers, plackets and multiple layers off the platen or out of the press area unless the process was built for them. A garment formed to the wrong length cannot be sold.

The Nebraska Innovation Studio publishes a specific Epson DTG-DTF printer procedure that separates garment and film workflows and defines local material and equipment conditions. It is a facility procedure for one system, so treat it as evidence that DTG and DTF need distinct steps, then follow the current manual and consumables for the printer in front of you.

Your own documents govern: the printer manual for the machine in the room, and the current safety data sheet for every ink, pretreatment, powder and cleaning fluid. Ask the maker or the facility safety officer.

Pretreatment is a measured quantity

Pretreatment holds white ink near the surface, lifts color density and supports durability. Applied wrong it leaves stains, crystals, pressure marks, yellowing, uneven hand or poor adhesion.

Typical wet pickup for dark cotton is 15 to 30 g/m², and many concentrates dilute 1:1 with distilled water. Spray in overlapping passes and measure the volume per garment, not the trigger time.

Apply it with the ventilation, containment and protective controls in the current safety data sheet and facility documents. Water-based does not mean safe to breathe.

White ink needs its own routine

White ink carries dense pigment that settles and can clog narrow ink paths.

Read the nozzle check before a run. Raising ink volume to cover a missing nozzle burns ink and hides a maintenance fault. After any cleaning, print the required verification and log the maintenance consumed.

Building and applying DTF transfers

Check the powder grade and shelf life against the film supplier sheet. Most DTF adhesives run 80 to 200 mesh, finer for detail. Apply powder from a shaker over a tray, shake the film to an even coat, then shake or brush off the excess through a screen.

Gel the powder at 160 to 170 C (320 to 340 F) for 60 to 120 seconds, until it turns glossy. Matte powder rubs off; a curled film is over-cured. Loose powder outside the image area becomes contamination on the press and on the next garment.

A transfer is not approved on the film. Approval happens after it is pressed onto the named garment, cooled, and inspected. Inspection covers bond, color, gloss, edge and hand.

Cure and press settings you can defend

Follow the current product instructions for time, temperature and pressure. Verify what the garment or film actually saw using the method the product specifies. A controller display reports the platen, not the ink film.

These are typical starting ranges. The ink, film, powder, garment and press decide the final numbers; record the press dial reading.

After cooling, inspect for these issues:

Maintenance and the record that makes reorders repeat

Hold room temperature and humidity inside the printer and ink limits. Keep caps, wipers, capping stations, and encoder areas on the current schedule. Keep platens, carriage path, waste systems and filters on the current schedule. Use approved cleaning fluid and lint-controlled wipes.

Worked example: reorder 1042, black cotton tee, lot B-118, pretreat 1:1 at 22 g/m², white lot W-77, cure 165 C for 150 s, wash test passed. The August reprint matched the sample.

A repeat order needs more than the artwork. It needs the configuration that produced the approved piece.

Common questions

Is DTF the same as sublimation?

No. DTF presses a printed adhesive film onto the fabric. Sublimation drives disperse dye into a compatible polyester or polymer surface. The two fail differently and are tested differently.

Does every DTG shirt need pretreatment?

Follow the ink, printer, garment and color workflow you qualified. White ink and many dark or blended substrates commonly need it. The product instructions decide, not a shop habit.

Can a passing nozzle check guarantee print quality?

No. It confirms one printhead condition. Several factors can still spoil the print:

Can a DTF transfer be approved before pressing?

Film-stage checks catch orientation, coverage and powder faults. Finished approval requires pressing onto the actual garment, cooling, inspection and the required durability tests.