What is the working principle of long-acting three heat-proof paper?

The working principle of the long-acting three-guard thermal paper is mainly based on the chemical reaction characteristics of the thermal coating. This thermal paper usually has a three-layer structure: the bottom layer is a paper base or film substrate, the middle layer is a thermal coating, and the top layer is a protective layer. Here's how it works:

1. Composition and chemical reaction of heat-sensitive coating

Thermal coating: composed of adhesive, color development agent, colorless dye (or dark dye). These ingredients are in a latent state before being heated and do not undergo significant chemical reactions.

Chemical reaction: When the thermal paper encounters the thermal print head, the colorless dye in the thermal coating reacts with the color developer under heating conditions to produce a colored product. This color change is immediate and irreversible, enabling the printing of text.

2. Function of the protective layer

Three protection characteristics: The long-acting three thermal sensitive paper is coated with a protective layer on the thermal sensitive coating, which mainly gives the paper the ability to waterproof, oil-proof and scratch-proof. The protective layer can effectively prevent the penetration of water, grease and other liquids, and reduce the damage of external physical friction to the thermal sensitive coating.

Prolong the preservation life: The protective layer can also absorb some of the light that causes the chemical reaction of the heat-sensitive coating, slowing down the fading rate of the printing paper, thereby extending the preservation life of the label paper.

3. Workflow

Printing process: During printing, the thermal print head of the thermal printer is heated to a specific temperature, which makes contact with the thermal paper and transfers heat. The heat-sensitive coating undergoes a chemical reaction when heated to form a visible text or image.

Storage and use: After printing, the long-life thermal paper is able to keep the information clear and readable in a variety of environments thanks to the triple-protection characteristics provided by its protective layer. At the same time, the existence of the protective layer also helps to extend the shelf life of the label paper.

4. Influencing factors

Environmental factors: Although the long-acting thermal paper has excellent performance, its service life is still affected by environmental factors. Conditions such as high temperature, high humidity, direct sunlight, etc., may accelerate the fading process of heat-sensitive coatings.

Chemical substances: Exposure to certain chemical substances may also cause damage to thermal paper and affect its use effect.

In summary, the working principle of the long-acting three thermal sensitive paper mainly depends on the chemical reaction characteristics of the thermal sensitive coating and the protective effect of the protective layer. Through reasonable structure design and production process control, it is possible to produce a long-acting three-heat-proof paper product with excellent performance.