How to check the printing quality of transparent thermal sensitive label paper?

Detecting the printing quality of transparent thermal label paper is a multi-step process that involves multiple aspects of evaluation. Here are some key steps and considerations:

1、 Appearance inspection

Color uniformity: Check whether the color of the label paper is uniform and there should be no obvious color difference or spots. For transparent thermal label paper, pay special attention to its transparency and whether there are impurities.

Surface flatness: The surface of the label paper should be flat and free from defects such as wrinkles, bubbles, or indentations.

Clarity and Contrast: The printed image or text should be clear and readable, with moderate contrast and no blurriness or double images.

2、 Size and accuracy testing

Dimensional measurement: Use measuring tools such as calipers and micrometers to accurately measure the length, width, thickness, and other dimensions of label paper to ensure compliance with relevant standards or customer requirements.

Printing accuracy: By printing test samples, check the accuracy of printed content, including line thickness, text clarity, etc.

3、 Print quality inspection

Print clarity: Evaluate the clarity and resolution of printed images to ensure that text, barcodes, QR codes, etc. are presented clearly.

Color saturation: Check whether the color of the printed content is full, without color difference or fading phenomenon.

Thermal reactivity: Test the reaction performance of label paper at different temperatures to ensure that it can work normally at the specified thermal head temperature, with moderate color development speed and clear color development.

4、 Physical performance testing

Friction resistance: Use a standard friction tester to perform multiple friction operations on the printed label paper, simulating the friction situations that may be encountered in daily use. High quality label paper should be able to withstand a certain amount of friction without significant fading or damaging the printed content.

Water resistance: Test the performance of label paper after immersion in water and evaluate its waterproof performance. Soak the paper in water and observe its deformation and fading.

Light resistance: Evaluate the durability of label paper under light conditions and determine its degree of fading in sunlight. Expose the paper to a light source and regularly check for fading.

Temperature resistance: Test the stability of label paper in high and low temperature environments. Place paper in high and low temperature environments and observe its performance changes.

5、 Chemical performance and safety testing

Volatile Organic Compounds (VOCs) testing: Evaluate potential harmful chemicals present in label paper to ensure compliance with environmental standards. Use gas chromatography to detect volatile organic compounds in paper.

PH value test: Measure the acidity and alkalinity of paper to ensure its safety for print heads and other devices. Use pH test strips or pH meters for measurement.

6、 Other tests

Tensile strength test: Measure the tensile strength of paper to ensure its durability during printing and use. Use a tensile testing machine for measurement.

Tear strength test: Evaluate the tear strength of paper to ensure its integrity during use. Use a tear testing machine for testing.

In summary, detecting the printing quality of transparent thermal sensitive label paper requires comprehensive consideration of multiple aspects, including appearance, size, printing quality, physical properties, chemical properties, and safety testing. Through comprehensive testing, it can be ensured that the printing quality of label paper meets relevant standards and customer requirements, improving the reliability and durability of the product.