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There are several layers involved in thermal transfer printing. The base layer is the carrier coated with release agent, ink and adhesive. The carrier is required to be temperature-resistant, pressure-resistant and have small tensile deformation. The release layer is a coating of eleven layers of release agent that remains solid at room temperature and can melt at a certain temperature. The bonding force with the base layer becomes smaller and can be quickly separated from the base layer without any adhesion residue. things.
Release agent is the key to separating the printing layer from the base layer and transporting it to the surface of the substrate. It is required to have excellent wear resistance, protect color inks, reduce the radiation intensity of ultraviolet rays, reduce the invasion of inks by adverse factors in the air, extend the service life of inks, and buffer the adhesion of the base film and the printing layer. . Printing layer, this layer is the basis for the aesthetic texture of thermal transfer products. With the advancement of printing technology and the development of image processing technology, the printing layer has various colors and patterns. In particular, the graphics and text obtained by gravure printing can well reflect the delicate graphics and text, making the packaging decoration effect more perfect.
Adhesive layer, its basic function is to have a high bonding force with the surface of the substrate to ensure a strong bond between the printing layer and the surface of the substrate. This layer of adhesive must match the printing material. Different adhesives, due to different chemical compositions, have very different adhesion to the substrate. The selection should be made based on different substrates. Thermal transfer processing I believe we all know that we need stable technology and a stable environment during the printing process, but in the current processing environment we have to perform multiple printings to judge whether the printing is complete. Why does thermal transfer printing need to be printed many times, as follows:
There are some instabilities in the printing process. The printing process has physical process and chemical process. The physical process is tangible, and as long as it is properly handled and analyzed, the problem can basically be solved. However, the chemical process can only see the results and can only be controlled by dyeing and finishing professionals, which requires a certain amount of experience and theory to support it. Most printing and coloring personnel only work long hours and have rich experience, but their professional knowledge is not comprehensive and cannot control these unstable factors. They can only judge by testing colors many times.
The management of printing and coloring technology is very important, which is reflected in the accuracy of printing measurement, such as the operation, temperature, speed, time, printing scraper pressure, scraper specifications, printing, steaming, baking, washing, post-printing finishing and other processes. The accuracy of the cloth itself, the accuracy of the formula, etc., any error in any factor will lead to inaccurate printing colors. If we treat printing and color matching technology as a system, we can solve many unstable factors. Some printing companies use personal experience and some wrong habits to predict and add printing materials for fast printing. This makes it difficult to ensure color accuracy, improve skills, and analyze printing problems.
The printing process is not managed scientifically, resulting in printing quality problems that continue to occur. Even if there are printing quality problems, we don’t know why, let alone how to deal with them. Thermal transfer processing and printing technical personnel are in an unstable state in the enterprise, with no sense of accomplishment and serious losses, and it is difficult to improve the level of printing skills.
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