What are the key technologies in the production process of self-adhesive thermal paper?

In the production process of self-adhesive thermal paper, several key technical links are involved, which together ensure the quality and performance of the product. The following is an overview of some key technologies:

Thermosensitive coating technology
Thermosensitive coating is the core part of self-adhesive thermal paper, which determines the color development effect of the paper when heated. Thermosensitive coating is usually composed of thermosensitive pigments, polymers and other additives, which react chemically at a specific temperature to display images or text.
Key technical points:
Selection of thermosensitive pigments: The pigments need to have good thermal sensitivity and color stability to ensure clear printing effects at different temperatures and times.
Application of polymers: Polymers act as adhesives to firmly adhere thermosensitive pigments to the paper substrate while providing a certain degree of flexibility and durability.
Coating process: Precision coating equipment and technology are used to ensure that the thermosensitive coating is evenly and smoothly applied to the paper substrate to avoid printing problems caused by too thick or too thin coatings.

Adhesive technology
Adhesives are the key to the self-adhesive function of self-adhesive thermal paper. It needs to have enough adhesion to stick firmly to the target surface, while being easy to peel off (for removable products) or maintaining long-term adhesion (for permanent products).
Key technical points:
Adhesive selection: Select the appropriate adhesive type according to application requirements, such as hot melt adhesive, water-based adhesive, etc.
Adhesion control: Control the adhesion by adjusting the formulation and coating amount of the adhesive to meet the needs of different application scenarios.
Weather resistance test: Test the adhesive for temperature resistance, moisture resistance, chemical resistance, etc. to ensure that it can maintain stable adhesion performance under various environmental conditions.
Paper substrate processing technology
The paper substrate is the support of self-adhesive thermal paper, and its quality and performance directly affect the overall effect of the product. Therefore, a series of treatments are required to the paper substrate during the production process to improve its performance.

Key technical points:
Paper selection: Select paper with good flatness, strength and ink absorption as the substrate.
Surface treatment: The paper surface is treated by coating, calendering and other processes to improve its smoothness, glossiness and printing adaptability.
Dimensional stability control: Ensure the dimensional stability of the paper by controlling the humidity, temperature and other conditions of the paper to avoid the dimensional changes caused by environmental changes affecting the printing effect.

Drying and curing technology
After the thermal coating and adhesive are applied, drying and curing are required to ensure their stable performance.
Key technical points:
Drying method selection: Select the appropriate drying method according to the characteristics of the coating and adhesive, such as hot air drying, ultraviolet curing, etc.
Drying temperature and time control: Ensure that the coating and adhesive are fully dried and cured by precisely controlling the drying temperature and time, while avoiding cracking or deformation caused by excessive drying.

Quality control and testing technology
During the production process, strict quality control and testing are required for each link to ensure product quality.
Key technical points:
Online testing: Use advanced online testing equipment to monitor and test various parameters in the production process in real time.
Finished product inspection: Strict appearance inspection, performance testing and durability testing of the finished product to ensure that it meets relevant standards and customer requirements.
Data analysis and feedback: Continuously optimize the production process and improve product quality by collecting and analyzing data during the production process.

The production process of self-adhesive thermal paper involves several key technical links, which together ensure the quality and performance of the product. With the continuous advancement of science and technology and changes in market demand, these technologies will continue to be improved and innovated.