The influence of coating on printing quality and s

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Influence of ink-jet printing paper coating on printing quality and stability (Part 2)

2.3 influence on printing performance

for an ink-jet pigment, its performance depends on its printed image. Print the test pattern on coated and calendered paper. Figure 2 shows the ink concentration values of blue, red, yellow and black (cmyb). The properties of all three SiO2 particles were compared. It can be seen from Figure 2 that the concentration values of colloidal SiO2 and sintered SiO2 black pigment inks are slightly higher

Figure 2 ink concentration - Epson printing press

except for cationic mordants, these pigments showed poor water resistance in the test. The particle structure and pH value have no effect on the water resistance, which is controlled by the surface chemistry of SiO2. The addition of cationic polymers such as polydadmac can improve the water resistance of these three particles. However, the new formula of colloidal SiO2 and sintered Ingeo can bring better impact resistance and toughness. SiO2 particles will reduce their surface gloss

key points for attention in the operation of hydraulic universal testing machine the study on printing characteristics by image analysis technology further shows that there are differences among the three SiO2 particles. Table 2 shows the image analysis results of Epson printer

Table 2 black dot characteristics -epson printing press

it can be seen from table 2 that the dot area from top to bottom decreases significantly. Smaller area is better, and printing resolution can be improved without losing ink concentration. The results of dot roundness test show that the sintered SiO2 coating has a more uniform coating structure. On the contrary, fumed SiO2 has a low dot area due to its high porosity, but irregular fumed particles produce a high dot roundness value, resulting in uneven coating

Figure 3 shows the porosity values of three SiO2 particles. The porosity of colloidal SiO2 and sintered SiO2 is lower than that of flue-cured SiO2. This data is consistent with the observed point area results

Figure 3 coating porosity

the porosity of colloidal SiO2 based coating is caused by the interstitial pores generated during the filling process of spherical particles. Sintered SiO2 with intercellular particle porosity is expected to have more porosity, but its porosity is only about 10% higher than that of colloidal SiO2. This may be due to the degradation of some sintered SiO2 into colloidal raw materials

fumed SiO2 showed the highest coating porosity. The final image quality requires that the investment range can be balanced between the coating porosity and coating uniformity. Although the printing quality of colloidal SiO2 and sintered SiO2, especially in the valve industry, is acceptable, their low porosity will restrict their use effect

3 conclusion

colloidal SiO2 and sintered SiO2 particles have more advantages than smoke SiO2 in rheology, solid content percentage, gloss, ink concentration and dot roundness. However, the coating showed low porosity. On the contrary, fumed SiO2 with rigid irregular shape can produce more porous layers. However, it can also reduce the gloss and solid content of the paint formulation. In order to obtain low cost and high gloss inkjet coatings, all factors must be balanced

Author: Ma Xin

information source: International Paper Making

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