What are the key process steps for producing transparent thermal label paper?

The key process steps for the production of transparent thermal label paper mainly include the following links:

1. Prepare raw materials

Substrate selection: PET (polyethylene terephthalate) is usually selected as a transparent substrate because it has good stability and transparency.

Preparation of heat-sensitive coatings: colorless dyes, color developing agents, sensitizers, fillers, adhesives, stabilizers and other raw materials are mixed in a certain proportion to make heat-sensitive coatings. The ratio and quality of these raw materials have an important impact on the performance of the final product.

2. Coating process

Coating equipment selection: The use of rolling coating equipment or other suitable coating equipment to ensure that the paint can be evenly coated on the substrate.

Control of coating quality: In the coating process, it is necessary to strictly control the quality of the coating, including the viscosity of the coating, solid content, etc., to ensure the uniformity and stability of the coating.

Control of coating speed and thickness: Control of coating speed and thickness is critical to the quality and performance of the final product. Appropriate coating speed and thickness can ensure that the coating has a good color rendering effect and durability.

3. Dry treatment

Drying equipment selection: Generally through the roller oven or other types of drying equipment for drying treatment.

Control drying conditions: During the drying process, the temperature, humidity and drying time in the oven need to be controlled to ensure that the heat-sensitive coating can fully cure and form a stable coating.

4. Winding and cutting

Winding molding: The transparent heat-sensitive paper that has been dried needs to be wound and formed into a roll-like product.

Cutting and winding: Through cutting and multi-axis automatic winding and other processes, the roll shaped product is cut into a suitable length, and the winding packaging is carried out to get the final product.

5. Quality inspection

In the entire production process, it is necessary to conduct multiple quality tests on raw materials, semi-finished products and finished products to ensure that the quality and performance of the products meet the standard requirements. The quality inspection process includes appearance inspection, size measurement, color rendering effect test and many other aspects.

In summary, the key process steps for the production of transparent thermal label paper include raw material preparation, coating process, drying treatment, winding and cutting, and quality testing. These links are interrelated and influence each other, and jointly determine the quality and performance of the final product. Therefore, the process parameters and quality indicators of each link need to be strictly controlled in the production process to ensure the production of high-quality transparent thermal label paper products.