What are the key technologies for producing transparent thermal sensitive label paper?

The key technologies for producing transparent thermal sensitive label paper mainly include the following aspects:

1、 Raw paper selection and processing

Raw paper quality: Selecting high-quality paper with a certain thickness, strength, and uniformity as the substrate is the foundation for ensuring stability and durability during the printing process.

Surface treatment: Necessary surface treatment of the base paper, such as coating with primer or other pretreatment, to improve the adhesion and printing effect of the thermal sensitive coating.

2、 Preparation and coating of thermosensitive coating

Thermal sensitive coating formula: Thermal sensitive coatings are mainly composed of various chemical substances such as colorless dyes, color developing agents, sensitizers, stabilizers, adhesives, etc. The selection and ratio of these ingredients need to be precisely controlled to ensure that chemical reactions can occur and release color under heating conditions.

Coating technology: Using precise coating techniques such as scraper coating, air knife coating, or immersion coating, the thermosensitive coating is evenly applied to the base paper. During the coating process, it is necessary to control the thickness and uniformity of the coating to ensure consistency in the printing effect.

3、 Drying and solidification

Drying method: After coating, the paper needs to be dried to remove moisture or solvents from the coating. Drying methods include natural drying, air drying, infrared drying, or ultraviolet drying. Choosing an appropriate drying method can improve production efficiency and reduce costs.

Curing treatment: During or after the drying process, curing treatment is also required to firmly adhere the coating to the paper and achieve the best printing effect. Curing treatment can be achieved through heating, ultraviolet irradiation, or chemical cross-linking.

4、 Protective layer coating (optional)

In order to improve the durability and adhesion of transparent thermal label paper, sometimes an additional protective layer is applied on top of the thermal coating. The protective layer can absorb some of the light that causes chemical reactions in the thermal sensitive coating, slow down the deterioration of the printing paper, and protect the thermal sensitive components of the printer from damage. The coating and drying process of the protective layer is similar to that of a thermosensitive coating.

5、 Quality inspection and slitting packaging

Quality inspection: Strict quality inspection is required for raw materials, semi-finished products, and finished products throughout the entire production process. The testing content includes the flatness of the paper, the uniformity of the coating, the printing effect, and durability. Quality inspection can ensure that product quality meets standards and customer requirements.

Cutting and packaging: Cut and package the produced transparent thermal label paper according to customer needs. During the slitting process, it is necessary to control the size and accuracy to ensure the suitability of the label paper. Packaging needs to consider factors such as moisture, dust, and damage prevention to ensure the quality of the product during transportation and storage.

In summary, the key technologies for producing transparent thermosensitive label paper involve multiple aspects such as raw paper selection and processing, thermosensitive coating preparation and coating, drying and curing, protective layer coating (optional), as well as quality inspection and slitting packaging. The precise control and application of these technologies are crucial for improving product quality and performance.