Thermal reaction principle of BOPP color thermal synthetic paper

The thermal reaction principle of BOPP color thermal synthetic paper is mainly based on the chemical reaction of thermal coating. The paper is usually made of BOPP (bidirectionally stretched polypropylene) film as a substrate, coated with a heat-sensitive color layer that contains chemicals such as leach dyes (also known as colorless dyes) and color developing agents. The following is a detailed explanation of the thermal reaction principle of BOPP color thermal synthetic paper:

Principle of thermal reaction

1. Leuco dyes and developing agents:

Leuco dye: at room temperature, leuco dye is colorless, it will not spontaneously develop color. This dye is one of the key components in thermal reactions.

Color developing agent: Color developing agent plays a catalytic role in the thermal reaction, and participates in the color developing reaction with the dark dye.

2. Heat sensitive coating:

The thermal coating is formed by coating chemical substances such as leach dye and color developing agent on the surface of BOPP film by special process. The coating is stable at room temperature and no color reaction occurs.

3. Thermal reaction process:

When the BOPP color thermal synthetic paper encounters a hot print head or other heat source, the local area temperature in the coating rises rapidly.

The high temperature causes the pigment and the developing agent to melt and react chemically. Under the catalytic action of color developing agent, the structure of the leach dye changes, so as to show the color.

As the temperature decreases, the color reaction is complete and the color is fixed to the paper to form the desired image or text.

Characteristics and application

Fast color rendering: The thermal reaction of BOPP color thermosensitive synthetic paper is very fast, suitable for applications requiring fast printing and marking.

Bright colors: Due to the special formulation and process treatment of the thermal sensitive coating, the color reaction produces bright and long-lasting colors.

Wide application: BOPP color thermal synthetic paper is favored by the market because of its excellent performance and a wide range of applications. It is commonly used for instant printing of receipts, labels, tickets, restaurant orders, and packaging and decoration materials that require bright colors and fast printing.

Matters needing attention

Preservation environment: Because the color reaction of thermal sensitive materials is reversible, BOPP color thermal synthetic paper should avoid long-term exposure to sunlight or high temperature environment during preservation to avoid fading phenomenon.

Quality selection: Different brands and models of thermal paper may have differences in quality, and users should be considered according to specific needs when choosing.

To sum up, the thermal reaction principle of BOPP color thermal synthetic paper is based on the chemical reaction of the pigment and color developer in the thermal coating at high temperature. This kind of paper has the characteristics of fast color development, bright color, etc., and is widely used in various instant printing and packaging decoration fields.