What are the quality inspection standards for BOPP colored synthetic paper?

The quality inspection standards for BOPP color synthetic paper mainly include the following aspects:

1、 Appearance quality

Basic requirements: The surface of the paper should be free of obvious bright spots, bubbles, black spots, oil stains, wrinkles, particle bursting, scratches, impurity contamination, and mechanical damage. The core of the film roll paper should not have dents or dents that affect its use, the cross-section should be free of burrs, and the flatness should be controlled within a certain range.

Joint requirements: For paper with a length of less than 3000m, joints are not allowed; The number of joints for paper with a length of over 3000m should be ≤ 1. Each batch of products is allowed to have a certain proportion of joints, but the specific proportion needs to be determined according to production standards.

2、 Dimensional stability

Width deviation: The width deviation of the paper should be controlled within the range of 0~+2mm.

Thickness deviation: The average thickness deviation of the paper should be ≤± 3%.

Length deviation: The length deviation of the paper should be controlled within the range of 0~+50m.

3、 Physical and mechanical properties

Tensile strength: The tensile strength of paper (including longitudinal and transverse directions) needs to meet certain standards to ensure that it is not easily broken during use. The specific values may vary depending on the thickness and purpose of the paper.

Elongation at break: The elongation at break of paper also needs to be controlled within a certain range to ensure that it has a certain degree of elasticity and toughness during use.

Glossiness: The glossiness of the paper should be ≥ 85% (or determined according to specific standards) to ensure that it has a good appearance effect.

Friction coefficient: The friction coefficient of paper needs to be moderate to ensure that it is not prone to adhesion or sliding problems during printing, processing, and use.

4、 Thermal reactivity performance

Color Brightness and Durability: Paper should be able to quickly produce bright and long-lasting colors after being heated, to meet the needs of printing or labeling applications.

Thermal response speed: The thermal response speed of paper should be moderate to ensure that it can produce clear images or text in a short period of time.

5、 Printing performance

Printing adaptability: Paper should have good printing adaptability and be able to meet the requirements of various printing processes, including ink adhesion, dryness, etc.

Ink adhesion: Paper should have strong ink adhesion to ensure that printed content is not easily peeled off or blurred.

6、 Safety and environmental protection

Non toxic, odorless, and tasteless: Paper should meet safety and environmental requirements, be non-toxic, odorless, and tasteless to ensure that it does not pose a threat to human health or the environment during use.

Moisture resistance: Paper should have a certain degree of moisture resistance to ensure that it can maintain good performance in humid environments.

7、 Other testing items

Oxygen permeability: For applications that require oxygen barrier, the oxygen permeability of paper needs to be controlled within a certain range.

Water vapor barrier properties: For applications that require moisture resistance, the water vapor barrier properties of paper also need to be tested.

Heat sealing strength: For packaging materials that require heat sealing, the heat sealing strength of paper also needs to meet a certain standard.

In summary, the quality testing standards for BOPP color synthetic paper cover appearance quality, dimensional stability, physical and mechanical properties, thermal reactivity, printing performance, safety and environmental friendliness, as well as other related testing items. These standards collectively ensure that the quality and usability of paper meet various application requirements. In the actual testing process, each item should be tested according to specific standards and requirements, and the operating procedures should be strictly followed to ensure the accuracy and reliability of the testing results.