What steps does the production process of color thermal label paper include?

The production process of color thermal label paper is a relatively complex process, which involves several key steps to ensure the quality and performance of the final product. The following are the main steps of the production process of color thermal label paper:

1. Raw material preparation

Base paper selection: Use high-quality base paper as the base paper, which is usually composed of cellulose fibers, with high whiteness, high smoothness and good physical properties.

Preparation of coating materials: Preparation of various materials required for thermal coatings, including colorless dyes (dark dyes), color developers, sensitizers, fillers, adhesives, stabilizers and lubricants. These materials will be mixed into a coating paste, which is used to form a heat-sensitive coating on the base paper.

2. Coating preparation

Mixing evenly: colorless dyes, color developing agents, sensitizers, fillers, adhesives, stabilizers, etc. are mixed evenly in proportion to form a heat-sensitive coating paste. This process requires strict control of the proportion of various ingredients and mixing conditions to ensure the uniformity and stability of the coating.

3. Coating and drying

Coating: Use a coating machine to evenly coat the prepared heat-sensitive coating paste on the surface of the base paper. Coating quantity, speed and uniformity need to be controlled during the coating process to ensure the quality of the coating.

Drying: Send the coated base paper into the drying channel for drying treatment. Parameters such as temperature, humidity and speed need to be controlled during the drying process to ensure that the coating can dry adequately and be fixed to the base paper.

4. Topcoat and protective coating (optional)

Surface coating: In some cases, in order to improve the surface properties of the label paper (such as wear resistance, water resistance, etc.), it may be necessary to apply a layer of coating on the thermal sensitive coating. The topcoat usually consists of a special resin or paint.

Protective layer: In order to enhance the durability and protective performance of the label paper, a protective layer is sometimes applied to the heat-sensitive coating or topcoat. The protective layer can effectively prevent the erosion of moisture, grease and chemicals on the label paper, and improve the wear resistance and scratch resistance of the label paper.

5. Cutting and packing

Cutting: The dried and processed label paper is cut according to the predetermined size and specification. During the slitting process, ensure that the incision is neat and accurate in size.

Packaging: Packaging the cut label paper, usually including labeling, measurement, classification and other work. The packaged label paper will be sent to the warehouse for storage for subsequent sales and use.

6. Quality control and inspection

In the entire production process, the raw materials, coating paste, coating quality, drying effect and the final product need to be strictly controlled and tested. This includes physical performance testing (such as thickness, smoothness, tensile strength, etc.), chemical performance testing (such as color rendering effect, color stability, etc.), and appearance inspection.

Through the above steps, high quality color thermal label paper can be produced. These labels have the advantages of good color rendering effect, bright color, strong durability, good protective performance, etc., and are widely used in logistics transportation, retail commodity pricing, medical drug management and other fields.