The core of preventing heat transfer film from sticking to powder is to control the temperature, pressure, and time during the operation process and properly pre-treat the materials. As long as each step is properly connected, the problem of powder adhesion can be significantly reduced.

1. Material Pre-treatment: Reduce Loose Powder from the Source

• Ensure the heat transfer pattern is completely dry after printing. For patterns printed by inkjet, let them stand for 5-10 minutes or bake them at a low temperature (40-50℃) for 1-2 minutes to prevent subsequent adhesion caused by undried ink.
• Select heat transfer films and fabrics that are compatible. For example, low-temperature heat transfer films are recommended for cotton fabrics, and medium-to-high temperature films for chemical fiber fabrics. Mismatched films and fabrics are prone to powder adhesion due to improper temperature.

2. Heat Transfer Parameters: Precisely Control the Three Core Factors

• Temperature: Too low a temperature will prevent the film from fully adhering, while excessively high temperature may cause the film to melt excessively and stick to powder. Generally, the temperature ranges from 100-120℃ for low-temperature films, 130-150℃ for medium-temperature films, and 160-180℃ for high-temperature films.
• Pressure: Insufficient pressure will result in poor contact between the film and the fabric, leaving excess powder residue; excessive pressure may deform the film and cause powder adhesion. A medium pressure (approximately 3-5kg) is recommended, which should be sufficient to make the film fit smoothly without air bubbles.
• Time: Too short a duration will prevent the film from curing, while too long a duration may cause the film to age and stick to powder. Generally, a single heat transfer process takes 8-15 seconds, and the specific time should be based on the film's instruction manual.

3. Operation Details: Reduce Residue of Excess Powder

• Before heat transfer, wipe the fabric surface with a clean, soft cloth to remove impurities such as dust and lint, preventing them from adhering to the film.
• Tear off the backing paper only after cooling the film after heat transfer. Allow it to cool naturally to room temperature (about 1-2 minutes) or use cold air to cool it quickly. Tear off the backing paper only after the film is fully cured to reduce powder falling off with the backing paper.
• If using a film that requires secondary heat transfer (such as cold-peel film), do not tear off the backing paper immediately after the first heat transfer. Complete the secondary reinforcement as required to ensure the film is fully integrated with the fabric.