Filler suitable for thermal paper--Titanium dioxide, zinc dioxide, and calcined white dioxide

Filler suitable for thermal paper--Titanium dioxide, zinc dioxide, and calcined white dioxide

These pigments are also widely used in coated paper due to their whiteness, hiding power (opaqueness), and good chemical stability. Their general whiteness, combined with their smooth texture, is used to enhance the gloss of coated paper. When selecting them as heat-sensitive fillers, in addition to their original contributions to paper whiteness, hiding power, and smoothness, they should also provide good color density and good compatibility with brush tips. The experimental results are shown in Table 3 (formulation as before).

Table 3

(Among them, the calcined white powder had poor color development, so only the stickiness test was performed.)

Experiments show that titanium dioxide has a low oil permeability value, indicating good oil absorption and thus good anti-sticking properties. Calcined titanium dioxide exhibits good anti-sticking properties.

They all have good adhesion, but they all have the problem of the black parts turning white after coloring. Although zinc oxide does not have a serious whitening problem, it has a more serious sticking problem, so it can only be used in small quantities due to its greater contribution to the base color.