The white adhesive powder (TPU powder) sticks to the wet ink on the film. When heated, it melts and acts as the glue that bonds the design to the fabric during the heat press stage.
The white adhesive powder (TPU powder) sticks to the wet ink on the film. When heated, it melts and acts as the glue that bonds the design to the fabric during the heat press stage.
The Direct-to-Film (DTF) printing process, while involving multiple stages, is a systematic workflow that yields high-quality, durable prints on various fabrics. Here’s a breakdown of the key steps:
Design Preparation & Printing:
First, your design is prepared, typically using graphic design software. For DTF, you'll need specialized RIP (Raster Image Processor) software. This software is crucial for managing color profiles accurately, creating the white ink underbase for printing on colored garments, and controlling ink laydown.
The design (CMYK colors first, then a white layer on top) is printed onto a special PET (Polyethylene Terephthalate) film using a dedicated DTF printer and DTF pigment inks.
Powder Application:
While the ink is still wet on the PET film, a hot-melt adhesive powder (typically a fine Thermoplastic Polyurethane - TPU powder) is applied evenly over the printed design. The powder sticks only to the wet ink. Excess powder is then shaken off.
Curing the Powder:
The film, now coated with powder, is passed through a curing oven or placed under a heat press in a non-contact (hover) mode. The heat melts the adhesive powder, which bonds with the ink, creating a smooth, slightly rubbery layer. This typically happens at temperatures between 100-160°C (212-320°F), depending on the powder.
Heat Pressing (Transfer):
The cured film is placed onto the garment or fabric in the desired position.
A heat press is used to transfer the design from the film to the fabric. This involves specific time, temperature (e.g., 150-170°C or 300-340°F), and pressure settings, which vary based on the fabric and DTF supplies used.
Peeling:
After pressing, the garment is allowed to cool (for "cold peel" films) or the film is removed immediately (for "hot peel" films). This removes the PET film, leaving the ink and adhesive design bonded to the fabric. Some films are "warm peel."
Understanding and mastering each step, especially the correct settings for your specific equipment and consumables, is key to achieving consistent, high-quality DTF prints.
The core steps are: 1. Print design onto PET film using DTF inks (CMYK + White). 2. Apply adhesive powder to the wet ink. 3. Cure the powdered film. 4. Heat press the film onto the garment. 5. Peel off the film.
Read MoreYou'll typically need RIP (Raster Image Processor) software to manage color profiles, white ink layers, and print quality effectively for DTF printing.
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