How is the transparency of transparent thermal label paper achieved?

The transparency of transparent thermal label paper is mainly achieved through the following aspects:

1、 Paper material and structure

Transparent thermal label paper typically uses high transparency substrates such as PET (polyester), PP (polypropylene), or PVC (polyvinyl chloride). These materials themselves have good transparency, allowing light to pass through the paper smoothly, thereby achieving high transparency. At the same time, these materials also have certain strength and toughness, which can meet the needs of label use.

2、 Thermal sensitive coating formula

Thermal sensitive coating is one of the key factors determining the transparency of transparent thermal sensitive label paper. In the coating formula, it is necessary to choose thermosensitive dyes and color developing agents with high transparency to ensure that the coating can quickly undergo chemical reactions and color development after heating, while maintaining high transparency. In addition, it is necessary to reasonably control the thickness and uniformity of the coating to avoid excessive thickness of the coating causing light to not pass through or uneven coating causing a decrease in transparency.

3、 Production process

The production process also has a significant impact on the transparency of transparent thermal label paper. In the production process, it is necessary to strictly control the conditions of coating, drying, and curing processes to ensure that the coating can adhere evenly and tightly to the substrate, and form a good thermosensitive reaction layer. At the same time, strict inspection and testing of the finished products are required to ensure their transparency meets relevant standards and requirements.

4、 Surface treatment technology

In order to improve the transparency and wear resistance of transparent thermal label paper, surface treatment technology can also be used. For example, a transparent protective film or calendering treatment can be applied to the surface of the label to increase its glossiness and flatness, thereby improving transparency. At the same time, these processing techniques can enhance the wear resistance and weather resistance of labels, extending their service life.

5、 Testing and evaluation

In order to ensure that the transparency of transparent thermal label paper meets the requirements, professional testing and evaluation are needed. Common testing methods include using a transmittance tester to measure the transmittance of paper and observing the visual effects of labels under different lighting conditions. Through these tests and evaluations, the transparency performance of labels can be objectively understood and optimized and improved.

In summary, the transparency of transparent thermal label paper is achieved through the selection of high transparency substrates, optimization of thermal coating formulations, strict control of production processes, adoption of surface treatment techniques, and professional testing and evaluation. These measures not only ensure that the transparency of the labels meets relevant standards and requirements, but also improve their overall quality and performance.