Thermal sublimation transfer printing principle

Sublimation generally goes through three processes: before the iron on transfer process, all the dyes are in the printing film on the paper, and the dye concentration in the printed fabric and air gap is zero. The size of the air gap depends on the fabric structure, yarn count and iron on transfer pressure. In the process of iron on transfer, when the paper reaches the iron on transfer temperature, the dye begins to volatilize or sublimate, and forms a concentration of volatilize between the paper and the fiber. When the printed fabric reaches the transfer temperature, the dye begins to adsorb on the fiber surface until it reaches a certain saturation value. Since the transfer of dye from paper to fiber is continuous, the adsorption rate depends on the rate of dye diffusion into the fiber. In order to make the dye can be directed diffusion, usually in the bottom side of the dye under the vacuum, so that the dye to achieve the directed diffusion transfer; After the transfer process, the dye content on the paper decreases after the dye is dyed, and part of the remaining dye migrates to the inside of the paper. The amount of dye remaining depends on the vapor pressure of the dye, the affinity of the dye to the pulp or transfer paper, and the thickness of the printing film. Sublimation generally does not need to go through wet treatment, can save energy and reduce the load of sewage treatment.

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