How to judge the quality of the heat-sensitive label paper?

To judge the quality of the three heat-sensitive label paper, it can be comprehensively considered from the following aspects:

First, appearance inspection

1. Color and gloss:

Observe the color of the paper, if the paper is too white, it may have added too much phosphor, which will affect the quality of its protective coating and heat sensitive coating. The color of the better quality heat-sensitive label paper should be slightly green, and the surface finish is moderate, and the reflected light is not strong.

2. Coating uniformity:

Check that the coating on the surface of the paper is uniform. Good quality paper, its heat-sensitive coating and protective layer should be evenly distributed, so that the paper looks smooth and flat. If the surface of the paper is uneven or there are obvious coating defects, it may affect the printing effect and service life.

Second, physical test

1. Fire test:

Heat the back of the paper with a lighter and observe the color change of the paper. The better quality heat-sensitive label paper should be black and green after heating, and the color block is uniform, and the color gradually fades from the center to the four sides. If the color of the paper turns brown or the color block is uneven, the heat sensitive formula is not reasonable or the coating is not uniform, and the storage time may be shorter.

2. Scratch test:

Run your fingernail firmly across the paper to see if it leaves a clear black scratch. For the three heat sensitive label paper, due to its anti-scratch characteristics, scratches should be relatively not obvious or show light color. If the scratch is obvious and the color is heavy, it may indicate that its scratch resistance is poor.

3. Friction test:

Use a standard eraser or cloth to repeatedly wipe the printed label, and observe whether the handwriting is easy to fall off or blurred. High-quality heat-resistant label paper should have good friction resistance to ensure that it is not easy to damage or blur information in normal use.

Third, professional instrument testing

Chroma measurement:

The chromaticity of the three thermal label paper is measured by a reflection colorimeter, and the measured value is compared with the standard value to determine whether the chromaticity parameters meet the requirements. At the same time, check whether there are color spots, color inequality defects.

Mechanical strength test:

The mechanical strength such as puncture resistance, scratch resistance and tear resistance was tested by means of needle puncture test and scratch resistance test. These tests help to evaluate the robustness and durability of the heat-resistant label paper in different use environments.

Durability test:

Thermal aging test, wet heat aging test, ultraviolet aging test and other methods were used to simulate the service life and stability of the heat-sensitive label paper in different environments. These tests can directly reflect the durability of the paper.

Fourth, practical application scenario consideration

When selecting the heat-sensitive label paper, it is also necessary to consider its actual application scenarios and requirements. For example, for label paper used outdoors, special attention needs to be paid to its waterproof, oil-proof and anti-ultraviolet aging properties; For the label paper of the catering industry, it is necessary to pay attention to its oil and friction resistance.

In summary, to judge the quality of the three thermal labels, it is necessary to consider the appearance inspection, physical testing, professional instrument testing, and practical application scenarios. Through these comprehensive testing and evaluation means, the quality of the heat-sensitive label paper can be more accurately judged, so as to choose high-quality products that meet the actual needs.