Hotmelt Powder is a granular adhesive made from ground TPU (Thermoplastic Polyurethane) or polyester particles. Specifically engineered for the Direct to Film (DTF) workflow, this powder is applied to wet pigment ink on a PET film.
Why It Matters: Impact and Use
Hotmelt powder is the “bridge” between digital ink and physical fabric. In a professional printing environment, the choice and application of this powder are critical indicators of E-E-A-T (Expertise, Authoritativeness, and Trustworthiness), as it dictates the stretch, softness, and durability of the final garment.
Wash-Fastness: The chemical bond formed by TPU hotmelt powder is highly resistant to water and detergents. A correctly applied DTF transfer can typically withstand 50+ industrial wash cycles without cracking or delaminating.
Selective Bonding: The powder is chemically formulated to adhere only to the wet textile ink and not the surrounding DTF Film. This allows for “no-weed” transfers, meaning complex logos and fine text can be applied without manual cutting or weeding.
The Gelling Process: Once applied, the powder must be “cured” (usually at 110°C–150°C). This turns the granular dust into a smooth, tacky layer. If under-cured, the transfer will peel; if over-cured, the adhesive may become brittle.
Soft “Hand-Feel”: High-quality hotmelt powders are designed to be extremely fine. This ensures that even large printed areas remain soft and flexible on the shirt, rather than feeling like a thick plastic sheet.
Technical Specifications: Fine vs. Coarse
| Powder Grade | Particle Size | Best Use Case | Benefit |
| Fine (Digital) | 0–80 µm | Small text, thin lines, light fabrics. | Superior softness and high detail. |
| Medium | 80–170 µm | General t-shirt printing (Standard). | Balanced durability and flexibility. |
| Coarse | 150–250 µm | Heavy workwear, canvas, denim. | Maximum adhesive “bite” for rough textures. |
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