Heat transfer film is a printing medium that is used in gravure printing to transfer ink onto various substrates. This film is usually made up of a carrier layer and a printing layer. The printing layer is the layer that carries the ink and is held in place by the carrier layer. During printing, the gravure cylinder rotates against the film, and the ink is transferred from the printing layer onto the substrate. Heat transfer film is ideal for printing on curved or uneven surfaces, such as bottles and containers. It is also widely used in the textile industry to transfer printed designs onto various fabrics. The heat transfer process ensures that the printed design is permanent and long-lasting, making it an ideal printing medium for a wide range of products.