What are the quality inspection indicators for three proof thermal paper?

The quality inspection indicators for three proof thermal paper mainly include the following aspects:

1、 Chromaticity and printing effect

Chromaticity measurement: A reflective colorimeter is used for measurement, and the measured values are compared with the standard values to determine the chromaticity parameters of the three proof thermal paper. At the same time, attention should be paid to checking for defects such as color spots and uneven color differences.

Printing effect: Evaluate the clarity, fullness, and readability of printed handwriting or patterns.

2、 Mechanical strength

Puncture resistance: tests the ability of paper to resist penetration by sharp objects.

Scratch resistance: Evaluate the ability of paper surface coatings to resist scratching and wear.

Tear resistance: measures the ability of paper to resist tearing under tension.

3、 Durability

Heat resistance: Test the stability of paper in high temperature environments to ensure that the optical density value of the color developing part is not lower than the specified standard.

Moisture resistance: Evaluate the durability of paper in humid environments, ensuring that the optical density value of the color developing part remains stable.

Waterproof performance: Testing the ability of paper to resist moisture penetration, usually measured by image retention rate.

Oil resistance performance: Evaluate the ability of paper to resist oil penetration, also using image retention rate as an indicator.

4、 Other performance indicators

Smoothness: Reflects the smoothness of the paper surface, affecting the printing effect and tactile sensation.

Brightness (whiteness): measures the brightness of the reflected light on the surface of the paper, which affects the visual effect.

Tightness: Refers to the mass per unit volume of paper, which is related to the strength and thickness of the paper.

Quantitative: refers to the weight of paper, usually expressed in terms of weight per square meter, which affects the thickness and durability of the paper.

5、 Appearance quality

Flatness of paper surface: Ensure that the paper surface is flat and smooth, without defects such as wrinkles and folds.

Coating uniformity: Check whether the paper coating is uniform to avoid problems such as streaks and spots.

Trimming neatness: Evaluate the neatness of paper trimming to ensure a smooth and even cross-section of the roll.

In summary, the quality inspection of three proof thermal paper involves multiple indicators, which together constitute the standard system for evaluating its quality. In practical applications, appropriate detection methods and indicators should be selected for evaluation based on specific needs and scenarios.