What is the printing principle of small roll thermal label paper?

The printing principle of small roll thermal label paper is mainly based on thermal printing technology, and the specific explanation is as follows:

1、 Structure and Characteristics of Thermal Paper

The surface of thermal paper is coated with a special layer that contains a latent dye and acidic substances. Hidden dye itself is colorless, and at room temperature, thermal paper looks no different from ordinary paper. However, as the temperature rises, these hidden dyes and acidic substances will melt into a liquid, and the molecules will immediately undergo a chemical reaction upon meeting, causing the paper to quickly display color.

2、 Construction and working principle of thermal printer

The structure of a thermal printer is relatively simple, with the main components including a drum and a print head. Among them, the print head is covered with tiny semiconductor heating elements that can heat specific areas of the paper as needed.

When a roll of thermal paper is placed in the printer, the drum will drive the thermal paper forward, bringing it into contact with the print head. During the printing process, the print head controls the heating of the heating element based on the printing data, resulting in high temperatures in specific areas of the thermal paper. This high temperature causes the latent dye and acidic substances on the surface of the thermal paper to melt into a liquid and undergo a chemical reaction, resulting in the appearance of text or graphics on the surface of the paper.

3、 Specific steps of the printing process

Thermal paper is transported forward by the drum and comes into contact with the print head.

The print head controls the heating of the heating element based on the print data, thereby generating high temperatures in specific areas of the thermal paper.

High temperature causes the latent dyes and acidic substances on the surface of thermal paper to melt into liquid and undergo chemical reactions.

Chemical reactions cause changes in the molecular structure of dyes, resulting in the appearance of colors and the formation of desired text or images.

4、 Summary of Printing Principles

The printing principle of small roll thermal label paper is to selectively heat the thermal coating on the surface of the paper through a thermal print head, thereby triggering a chemical reaction and color development. This printing method has advantages such as speed, efficiency, and environmental friendliness, and is widely used in multiple industries.

In summary, the printing principle of small roll thermal label paper is based on thermal printing technology, which utilizes the special coating on the surface of thermal paper and the heating element on the print head to achieve fast and efficient printing.