How to check whether the produced three proof thermal paper is qualified?

Testing the quality of the produced three proof thermal paper can be carried out from the following aspects:

1、 Appearance inspection

Surface quality: check whether the surface of the three proofing thermal paper is flat and smooth, free of foam, impurities, wrinkles, wrinkles, holes, obvious streaks, crack spots and other defects.

Trimming and Rolling: Trimming should be neat, and the section of the rolling drum should be flat and smooth.

Packaging label: The length or number of labels should be indicated on each roll of three proof thermal paper packaging. The deviation in length should not exceed the specified value, and the deviation in number of labels should also comply with the standard.

2、 Size inspection

Use measuring tools such as calipers and micrometers to measure the length, width, thickness, and other dimensions of the three proof thermal paper to ensure compliance with standard requirements.

3、 Chromaticity and printing quality testing

Chromaticity measurement: Using a reflective colorimeter for measurement, comparing the measured value with the standard value, determining the chromaticity parameters of the three proof thermal paper, and checking for defects such as color spots and uneven color difference.

Printing effect: By printing test samples, check the printing clarity, resolution, color saturation, and whether the handwriting is clear, non fading, and non shedding of the three proof thermal paper.

4、 Physical performance testing

Mechanical strength: Needle puncture test, scratch resistance test and other methods are used to test the mechanical strength of the three proof thermal paper, including puncture resistance, scratch resistance, tear resistance, etc., to ensure that it can be firmly and durable in different usage environments.

Fragility test: Ensure that the breakage rate of the three proof thermal paper does not exceed a certain limit to ensure stability and reliability during use.

5、 Durability testing

Thermal aging test: Simulate the use under high temperature environment to test the heat resistance of the three proof thermal paper.

Damp heat aging test: Simulate the use in a humid environment to test the moisture resistance of the three proof thermal paper.

UV aging test: Simulate the use of UV radiation to test the light resistance of three proof thermal paper.

6、 Chemical performance testing

Detect the content of harmful substances such as heavy metals, formaldehyde, benzene, etc. in the three proof thermal paper to ensure compliance with environmental requirements.

7、 Image saving performance test

Test the image preservation performance of the three proof thermal paper after color development, including heat resistance, moisture resistance, water resistance, oil resistance, ethanol resistance, and friction resistance, to ensure that the image can remain clear and stable for a long time.

8、 Inspection rules and sampling methods

Inspection classification: Product inspection is divided into factory inspection and type inspection. Factory inspection is a quality inspection conducted on each batch of products, while type inspection is a comprehensive assessment of the products.

Sampling method: Conduct sampling according to the sampling methods specified in relevant standards to ensure the representativeness and reliability of the samples.

In summary, it is necessary to comprehensively consider and test whether the produced three proof thermal paper is qualified from multiple aspects. Only through comprehensive and strict testing can we ensure that the quality of the three proof thermal paper meets the standard requirements and meets practical application needs.