DTF (Direct-to-Film) heat transfer film is a specialized substrate designed for white ink transfer printing. It uses the principles of heat transfer to apply designs onto fabrics or other materials. The quality of the heat transfer directly depends on the choice of DTF film.
Over the decades, white ink heat transfer technology has advanced significantly, introducing various types of DTF films in the market. The most common options include cold peel film, hot peel film, and instant peel film.
Faced with a wide array of choices, many customers may feel overwhelmed: What is DTF film? How do these films differ? Which type is best for your needs? Follow TUCAN, a professional manufacturer of DTF printers, as we explore the answers in this article.
1. What is Heat Transfer Film?
Heat transfer film is a special coated PET (polyethylene terephthalate) film, typically composed of six layers: base layer, release layer, adhesive layer, printing layer, protective layer, and anti-static layer. It plays a critical role in the DTF printer process.
During the printing process, the final step involves peeling off the transfer film, leaving the design on the substrate. The differentiation between hot peel, cold peel, and quick peel films comes from the timing of this peeling process.
1.1 What is Hot Peel Film?
Hot peel film can be removed immediately after heat pressing, while the film is still hot (usually within 10 seconds of pressing at a surface temperature above 100°C or ambient temperature of 35°C).
Characteristics:
·Hot peel film saves time by eliminating the need for cooling, making it suitable for high-efficiency, batch production.
·However, if not peeled in time, the adhesive may cool and stick to the fabric, leading to difficulties in removal or design damage.
·Requires strict control of pressing time, temperature, and pressure.
1.2 What is Cold Peel Film?
Cold peel film requires cooling to a certain temperature (usually around 30 seconds or when the surface temperature drops below 55°C) before it can be peeled off easily.
Characteristics:
·Offers better stability and results in a matte finish.
·Ideal for textured or specialty fabrics (e.g., coated fabrics, canvas, velvet) that benefit from the cooling time to restore their flatness after heat pressing.
1.3 What is instant Peel Film?
Quick peel film is a variant of hot peel film, designed to be removed almost immediately after pressing.
Characteristics:
·Perfect for high-efficiency, large-scale production due to its quick peeling nature.
·Demands precise timing and technique, making it slightly more challenging to handle.
2. Hot Peel vs. Cold Peel vs. Instant Peel: Which is Better?
Each type of film has its advantages and is suited to different production and printing needs.
·Hot Peel and Instant Peel Films:
These are ideal for mass production of standard cotton garments, such as t-shirts.
Note: For hot peel films, maintain pressing temperatures between 140–160°C, apply 4–5 kg pressure, and press for 8–10 seconds for optimal results.
·Cold Peel Films:
Offer greater stability and are better suited for intricate designs and fine lines. Cold peel films, which primarily use silicone (as opposed to wax in hot peel films), provide superior melting and application properties.
Recommended Settings: Press at 150–170°C for 10–20 seconds and peel after cooling.
Each type has its strengths, so choose the film that best aligns with your specific needs. Remember, there’s no perfect product—what works best for you is the ideal choice.
Pro Tip: Different brands and types of PET heat transfer films may have subtle differences. Always read the product instructions carefully and conduct testing before bulk production to ensure optimal results.
3. How to Choose a High-Quality Heat Transfer Film?
3.1 High Ink Absorption
Low-quality films with poor ink or moisture absorption may result in issues like ink leakage, discoloration, or water stains during printing.
3.2 Superior Coating Quality
The surface coating of DTF films is critical. Uneven or impure coatings can directly affect printing results. Look for films with smooth, uniform, and fine coatings.
3.3 No Powder Residue
Poor-quality films may leave adhesive powder residue around the design edges, compromising the appearance of the final product. Choose films that ensure clean, residue-free transfers.
3.4 Easy to Peel
A good DTF film should peel off effortlessly after pressing, ensuring stability and completeness of the transferred design.
3.5 High Temperature Resistance
Since heat transfer powder melts at 80°C, DTF films must withstand high temperatures. Test at 120°C—if the film doesn’t yellow or wrinkle, it’s of good quality.
By understanding the types and features of DTF films, you can select the right film for your business needs. Always prioritize testing and refer to product manuals for the best results in your heat transfer projects.
