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How to solve the problems caused by improper paper ink absorption failure?
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How to solve the problems caused by improper paper ink absorption failure?
date:2016/3/3 9:34:45 access:次瀏覽 writer:admin

Ink absorption quantity can be considered from the perspective of pore size. Ink after fill in the pore, wool tube around the links of ink absorption of paper, if the paper fiber between pore is small, the capillary effect of the fiber, ink absorption performance is poor; If the paper is the porosity of the fibers is too big, strong absorbency, when printing ink viscosity lower capillary absorption link not only, also absorb paint, will lead to ink infiltrate into the paper back, telegraphing occur, and affect the thickness of the dry ink layer, make the imprinting cannot be on paper presents its color saturation, affect the amount of printed matter.

Pressure infiltration and free penetration phase of osmotic quantity with absorption properties of the paper have a lot to do, especially free infiltration is more outstanding. Therefore, the stronger the absorbency of paper, paper on ink link is the faster absorption rate, ink drying speed is faster. The absorbency of paper has a lot to do with the quality of the print, many fault is due to the absorbency of paper and printing in the printing conditions don't match.

1. The absorbency of paper is too strong

(1) imprinted matte, pulverization

In printing, the paper mainly is the links of ink absorption material, if the paper on ink absorption ability is strong, link layer or coating material is absorbed excessive feed, paper printing ink layer caused by lack of link, make the pigment particles suspended in the paper, after conjunctival dry prints the cardinal imprinting color or lose their luster, even some imprinting upon friction, flake pigment will show granular, pulverization phenomenon. When pulverization serious, in the process of set, after the printing color will be before the color of the ink layer from stripping down on paper.

The solution is as follows

(1) to replace the right paper.

(2) using a goo increase ink viscosity, or resin is added in the ink ink oil content is higher.

(3) the paper wet processing.

(2) through printed

Ink viscosity is small, the printing pressure is too large, paper on ink absorbent strong, link into paper inside the pore, replaces the paper pores in the part of the air, causing air - fibre, air - packing, air - scattering interface between the coating to reduce, reduce the light scattering ability of paper, increase transparency, it may lead to show through.

The solution is as follows

(1) to replace the right paper.

(2) reduce printing pressure.

(3) improve the ink viscosity.

(3) ink layer density is lower, color change

When printing on wool stoma larger paper, part of the pigment and infiltration of paper material will be held in (the paper fiber porosity is greater than the pigment particles), link material excess infiltration, can make imprinted dry, ink tinting strength drops, ink layer of saturation is reduced, makes the color of the print concentration decreased obviously. Significantly reduced at the same time, color print concentration will make the print color change, and influence of gray balance right.

The solution is as follows:

(1) to replace the right paper.

(2) for this paper to gray balance data test.

2. The absorbency of paper is too weak

Paper absorbency is too weak, ink absorption of speed too slow, while in the process of printing can be brightly colored ink layer, but the impact of ink penetration fixation and oxidative polymerization, the ink fixation rate reduce, transfer ink to paper cannot be quickly absorbed by the paper, after the wet ink will move to the back of another piece of paper covered, causing sticking dirty, serious when will happen adhesion.

The solution is as follows:

(1) to replace the right paper.

(2) the appropriate increase the printing pressure.

(3) lower ink viscosity.

(4) reduce the printing speed.

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