Paper ink absorption is not only related to the loose degree and capillary state of paper, but also related to the surface properties of paper fiber, the content of filler, pigment, glue, the composition and characteristics of ink, printing method, printing pressure and other factors.In actual printing, the absorption of ink can be divided into two stages.
The first stage is the pressing moment of the printing press, relying on the action of printing pressure, part of the ink transferred to the surface of the paper into the larger pores, that is, the whole ink (including the pigment in the ink) into the paper pores. This process is generally called the pressure infiltration stage. At this stage, the paper absorption of the ink mainly depends on the size of the printing pressure, the structure of the paper and the ink viscosity and other factors.
The second stage is from the paper from the imprint area until the ink is completely dry. This stage mainly depends on the capillary action of the paper to absorb the ink, called the free infiltration stage. At this stage, the link separates from the ink bulk and enters the paper interior rather slowly through the small pores and the rough surface of the paper fibers.
El papel es un material poroso, y hay muchos espacios de diferentes tamaños entre fibra y fibra, y entre fibra y relleno, que son equivalentes a muchos capilares. Bajo la acción de estos capilares, el material de conexión en la tinta se puede absorber, y cuanto más grueso sea el diámetro del capilar, más rápida será la tasa de absorción de tinta. Por lo tanto, la estructura de poros del papel determina su absorción de la tinta. Cuanto más suelto es el papel, más grandes son los poros y más fuerte es la absorción de tinta.