The influencing factors of ink absorption performance of sublimation transfer paper(part one）
The ink absorption of paper refers to the ability of the paper surface to receive the transfer ink at the moment of imprinting, the ability of the paper surface to be wetted by the printing ink, the ability of the paper surface to absorb certain ink components, and the ability of the paper surface to fix and retain a uniform ink film. The comprehensive embodiment. Paper absorption ink is divided into two stages, one is the pressure infiltration stage: at the moment of printing press imprinting, depending on the printing pressure, part of the ink transferred to the surface of the paper, including pigments, binders, etc., is simultaneously pressed into the paper. In the pores. The second is the stage of free infiltration. This stage is from the paper leaving the embossing area until the ink is completely dry, mainly relying on the capillary action of the paper fibers to absorb the ink. At this stage, the absorption rate of the ink on the paper determines whether the printed matter has gloss, and whether powdering or offsetting occurs.
In addition to the basic requirements of general coated paper, the base paper of the sublimation transfer paper has certain requirements on the tightness and air permeability of the base paper. The base paper has a tighter degree, generally above 0.9g/cm3, and the air permeability is smaller. If the base paper is too tight and has a large air permeability, the ink will penetrate into the back side of the base paper during the inkjet process, causing a bleed phenomenon. During the sublimation transfer process, the sublimated ink will also spread out through the back side of the base paper, affecting the transfer effect. If the base paper is too tight and the air permeability is small, in the inkjet process, the ink does not easily enter the inside of the paper, accumulates on the surface of the paper, is easily smeared, and causes ink accumulation, which also affects the transfer effect. The ink absorption performance of the sublimation transfer paper base paper is also closely related to the paper void ratio, the filling amount, the sizing amount, etc., and the void ratio is a fundamental factor affecting the ink absorbing performance of the paper, and the ink particles enter the paper inside through the gaps. The size of the void ratio directly affects the speed at which the paper absorbs ink and the amount of ink absorbed. The amount of filling will affect the porosity of the paper, which will affect the ink absorption performance of the paper. The type of filler will be different, and the affinity for the ink will be different, which will also affect the ink absorption performance of the paper. Whether it is sizing in the slurry or sizing outside the pulp, it will affect the hydrophilicity of the paper, which will affect the absorption properties of the paper.
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