How to judge the quality of small core thermal label paper?

To judge the quality of small core thermal label paper, you can consider from the following aspects:

First,Appearance observation

1.Color and gloss:

Paper color: Good quality thermal paper should be slightly green, not too white. Too white paper may have added too much phosphor, which will affect the stability of its heat-sensitive coating and the durability of the print effect.

Gloss: The surface of the paper should be uniform, no obvious reflection phenomenon. Reflective paper may also have too much fluorescent agent added, which is not conducive to long-term preservation.

2.Coating uniformity: Observe whether the coating on the surface of the paper is uniform, and there are no obvious uneven spots or stripes. Uneven coating will affect the clarity and consistency of the print effect.

Second, physical performance test

Although it may not be practical to directly test the physical properties of small core thermal label paper, it is possible to assess its quality indirectly by understanding the product specifications and the data provided by the manufacturer. Here are some key physical performance indicators:

1.Degree of vulcanization: an important index reflecting the anti-aging ability of thermal sensitive paper. The smaller the degree of vulcanization, the better the stability of thermal paper in high temperature and high humidity environment.

2.Print density: A measure of the sharpness of text or images on thermal paper. The higher the printing density, the higher the sensitivity of the thermal paper to heat, and the clearer the printing effect.

3.Lateral elongation: reflects the resistance of thermal paper to stretching. The lateral elongation is moderate, helping to ensure the stability of the paper during the printing process.

Third, the actual print effect test

1.Clarity and durability: Through actual print tests, observe the clarity of the printed content and its durability under different environmental conditions. Good quality thermal paper should be able to print clear, neat edges of the text and images, and in a certain period of time to keep the color bright, not easy to fade.

2.Blackness and uniformity: Under fire or sunlight, observe the color change of the paper after being heated. Good quality thermal paper should show a uniform black green after heating, and the color gradually fades from the center to the periphery. If the color is uneven or brown, it may indicate that the thermal formula is not reasonable or the coating is not uniform.

Fourth, environmental protection and safety

Environmental labeling and testing report: Pay attention to whether the product has passed the relevant environmental certification, such as whether it contains harmful substances such as bisphenol A. Choosing environmentally friendly thermal paper helps to protect the environment and human health.

In summary, to judge the quality of small-roll thermal label paper, it is necessary to consider the appearance, physical properties, actual printing effect, environmental protection and safety. When purchasing, it is recommended to choose products with well-known brands, relevant certifications and good reputation.