What is the production process of small roll thermal label paper?

The production process of small roll thermal label paper is a complex and fine process, mainly involving base paper treatment, multi-layer coating, drying, calendering finish and quality detection. The following are the detailed steps of the production process of small roll thermal label paper:

First, base paper preparation

Selection of raw materials: The base paper that meets the requirements is selected as the base material, and the quality of the base paper directly affects the performance of the final product.

Unwinding: The base paper roll is placed on the unwinding device of the production line, ready for subsequent processing.

Second, coating process

The coating process of small roll thermal label paper is the core part of its production process, which usually includes multiple coating and drying processes.

1.First pre-coat (base coat) :

Coating composition: mainly composed of pigments (such as kaolin), adhesives (such as polyvinyl alcohol PVA, carboxymethyl cellulose CMC, etc.) and a small number of additives (such as dispersants, lubricants, etc.).

Objective: To improve the smoothness of paper and provide a good foundation for subsequent coating.

Operation: The base paper is coated with a relatively coarse particle size coating to form the first pre-coating (bottom coating), and then dried.

2.Second pre-coating (thermal coating) :

Paint composition: The main components are colorless dyes (such as fluoranes) and color developing agents (such as bisphenol A), as well as adhesives, pigments and other auxiliaries.

Objective: To form a heat-sensitive layer. When heated, the colorless dye reacts with the color developing agent to show the writing.

Operation: Apply with a relatively fine particle size coating to form a second pre-coat (thermal coating) and dry again.

3.Surface Coat:

Coating composition: Depending on product requirements, one or more layers of coating may be required to provide additional properties (such as water resistance, oil resistance, friction resistance, etc.).

Objective: To enhance the durability and adaptability of label paper.

Operation: Apply topcoat to heat sensitive coating, form topcoat, and dry.

Third, press finish

Objective: To improve the surface gloss and flatness of the label paper, so as to make it more beautiful and easy to print.

Operation: Calender finishes the coated paper by calender.

Fourth, quality testing

Purpose: To ensure that the produced label paper meets the quality standards and meets customer requirements.

Detection content: including paper thickness, gloss, color performance, water and oil resistance and many other indicators.

Operation: Through professional testing equipment to produce a comprehensive test of the label paper.

Fifth, foll and pack

Purpose: Easy storage and transportation.

Operation: Roll the qualified labels to a certain length and package them.

To sum up, the production process of small roll thermal label paper is a complex process involving multiple links, and it is necessary to strictly control the process parameters and quality standards of each link to ensure the production of high-quality products. At the same time, with the continuous progress of technology and the constant change of market demand, the production process is also constantly optimized and improved.