Will the coating of the three proof thermal paper affect the light transmittance and color contrast of the paper?

The coating of three proof thermal paper does indeed have an impact on the light transmittance and color contrast of the paper. The following is a detailed analysis of this impact:

1、 The influence of coatings on light transmittance

Three proof thermal paper usually includes a substrate, a thermal sensitive coating, and a protective layer (film coating). The main function of the protective layer is to enhance the waterproof, oil resistant, and abrasion resistant properties of the paper. However, the presence of this protective layer can alter the optical properties of the paper surface, thereby affecting its transmittance. Specifically:

The material and thickness of the protective layer: The material and thickness of the protective layer directly affect its ability to transmit light. Thicker protective layers or protective layer materials with specific optical properties may reduce the light transmittance of the paper.

The adhesion between coating and substrate: The tightness of the adhesion between coating and substrate also affects the transmittance. If the coating does not bond well with the substrate, it may cause light scattering at the interface, further reducing the transmittance.

2、 The influence of coatings on color contrast

Color contrast refers to the contrast between the color effect of printed content on paper and the background. The influence of the coating on the color contrast of the three proof thermal paper is mainly reflected in the following aspects:

The composition of thermosensitive coating: The type and content of color developing agents and other additives in thermosensitive coating will directly affect the color development effect. Optimized coating formulations can improve color contrast and clarity.

Transparency of protective layer: The transparency of protective layer has a significant impact on color contrast. A transparent protective layer can maintain the clarity and contrast of printed content, while an opaque protective layer may reduce color contrast.

The interaction between coating and printing ink: The interaction between coating and printing ink can also affect color contrast. If the coating has good absorption and fixation ability for ink, it can ensure the clarity and durability of printed content.

3、 Considerations in practical applications

In practical applications, it is necessary to consider the influence of the coating of the three proof thermal paper on the transmittance and color contrast to ensure the readability and durability of the printed content. For example, in application scenarios that require high-definition printing, three proof thermal paper with excellent light transmittance and color contrast should be selected. At the same time, attention should be paid to the storage environment and conditions of the paper to avoid adverse effects of environmental factors on its performance.

In summary, the coating of the three proof thermal paper will have an impact on the light transmittance and color contrast of the paper. When selecting and using three proof thermal paper, comprehensive consideration should be given to specific application scenarios and needs.