Effect of sublimation transfer paper structure on ink absorption performance

   Sublimation transfer printing can print image on paper by high-speed and high-quality inkjet printer, which eliminates the trouble of plate-making. At the same time, the transfer printing pattern is clear, lifelike, high rate of authentic products, the image is not easy to fade, fall off, long service life, the print feel soft and comfortable, more and more welcomed by people.The sublimation transfer paper acts as a carrier in the process of pattern transfer. Sublimation transfer paper must meet various requirements, such as high temperature resistance, shape stability and ink absorption, etc., especially the ink absorption performance of thermal sublimation transfer paper has a great impact. Today, we discuss the influence of the paper structure of the sublimation paper on the ink absorbency.

     The ink absorbency of paper refers to the ability to transfer ink on the surface of the paper at the moment of imprint. Paper absorption ink is divided into two stages, one is pressure penetration stage: in the press moment, rely on the role of printing pressure, transfer to the surface of the paper part of the ink, including pigments, binders, etc. at the same time into the larger pores of the paper. The two is the stage of free penetration. This stage is from the paper leaving the imprint area until the ink completely dry, mainly rely on the capillary effect of paper fiber to absorb ink. At this stage, the absorption rate of paper to ink determines whether the printed matter is glossy, whether it will occur pulverization, penetration and other phenomena.
     Paper is a porous material. There are a lot of small gaps or pores inside the paper. If the paper does not match the pore structure and ink characteristics, it will lead to a series of printing problems. When the pores between the paper fibers are very small, the capillary action of the fibers is destroyed and the ink absorption performance will be poor. When the pores are very large, the ink absorption of the paper is too strong. If the viscosity of the ink used at this time is low and the printing pressure is high, it will cause the ink to penetrate into the back of the paper, resulting in the phenomenon of penetration, so that the imprinting can not be in the paper. The surface of the sheet should show its proper color saturation and affect the quality of printed matter.
     In addition to the basic requirements of coated paper, the base paper of sublimation paper has certain requirements for tightness and permeability of the base paper. The base paper tightness should be larger, generally more than 0.9g/cm3, and the air permeability is smaller. If the base paper is too tight and permeable, ink will penetrate into the back of the base paper during the inkjet process, resulting in the phenomenon of tarnish. In the heat sublimation transfer process, the sublimated ink will also diffuse through the back of the base paper, affecting the transfer effect. If the base paper is too tight, less air permeability, in the inkjet process, ink is not easy to enter the paper, stacked on the surface of the paper, easy to get dirty, resulting in pile-up ink phenomenon, will also affect the transfer effect. The absorbability of heat dye sublimation paper is also closely related to the paper void fraction, filling capacity, sizing capacity and so on. Void fraction is the fundamental factor affecting the paper's ink absorption performance. Ink particles enter the paper through these voids. The void fraction directly affects the speed and amount of paper's ink absorption. The amount of filling will affect the porosity of the paper, and then affect the ink absorption performance of the paper. Different types of fillers, the affinity of the ink is also different, will also have an impact on the ink absorption performance of the paper. Whether in-pulp sizing or out-pulp sizing, will affect the hydrophilicity of paper, and then affect the paper's ink absorption performance.
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More info:
Website: www.skyimagepaper.com 
Company Name: Fei Yue Digital Technology Co.,LTD
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