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

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

First, appearance inspection

1.Color and gloss: The appearance of good quality heat-resistant label paper should be slightly green, no impurities, good smoothness, and no obvious rough feeling in the hand. If the paper is too white, it may be that too much phosphor has been added, indicating that the protective coating and heat-sensitive coating of the paper may not be reasonable.

2.Uniformity: Observe whether the surface of the paper is uniform, no wrinkles, wrinkles, holes, obvious streaks, RIPS and other appearance of paper disease. The appearance of the paper should be uniform, if the surface is not uniform, it indicates that the thermal sensitive layer and the protective layer are not good enough during production, which may affect the quality and stability of the paper.

Second, physical performance test

1.Fire test: Heat the back of the paper with a lighter and observe the color change. Good quality thermal paper should show black green and uniform color blocks after heating, and gradually fade from the center to the surrounding color. If it appears brown or black with small streaks or uneven color patches, it indicates that there may be a problem with the thermal formula, the preservation time may be short, and the coating may be uneven.

2.Mechanical strength test: The mechanical strength of paper such as puncture resistance, scratch resistance and tear resistance can be tested by needle puncture test and scratch resistance test. These tests help to assess the durability and stability of the paper in different use environments.

Third, chemical stability test

1.Waterproof, oil-proof, anti-pollution test: apply water, oil or hand cream and other substances on the three heat-proof label paper to observe whether it can effectively resist the penetration and pollution of these liquids. This is one of the key indicators to test the performance of the three defenses.

2.Light performance test: the printed paper is daubed with a highlighter and placed in the sun to observe the speed of the paper blackening. The faster the blackening rate, the shorter the preservation time, and the worse the chemical stability of the thermal coating.

Fourth, printing effect and adaptability

1.Printing effect: Observe whether the printed writing is clear and the density is high, which is an important indicator of one of the main properties of thermal paper.

2.Print head adaptability: poor quality thermal paper on the print head wear, easy to stick to the print head. Therefore, the adaptability of the paper to the print head should be considered in the selection to reduce the failure and loss in the printing process.

Fifth, environmental protection and health performance

1.Environmental performance: If there is a need for environmental protection, check whether the paper contains heavy metals, fluorescent whitening agents and other harmful substances. These substances may cause harm to human health and the environment.

2.Health performance: Ensure that the paper will not release harmful gases or substances during use to protect the health of users.

In summary, judging the quality stability of the three thermal labels needs to be comprehensively considered from many aspects such as appearance, physical properties, chemical stability, printing effect and adaptability, as well as environmental protection and health performance. Through strict testing and evaluation, we can choose the three heat-resistant label paper products with stable quality and excellent performance.