What are the quality testing standards for color copperplate label paper in the industry?

The quality testing standards for color copperplate label paper in the industry involve many aspects to ensure that the quality of label paper meets the needs of use. The following are some of the main quality inspection criteria:

1.Appearance detection

Flatness: The surface of the label paper should be flat and free from bubbles, creases, and stains.

Color consistency: The color of the label paper of the same batch or different batches should be consistent, without obvious color difference.

2.size detection

Length and width: The length and width of the label paper should meet the design requirements, and the error should be within the allowable range.

Shape and dimensional stability: under different environmental conditions, the size of the label paper should be stable and not deformed.

3.material testing

Paper type: Confirm whether it is colored coated paper, and the specific type of paper (such as glossy coated paper, matt coated paper, etc.).

Thickness and density: The thickness and density of the paper should meet the relevant standards, and the error should be within the allowable range. For example, the international standard stipulates that the thickness error of coated paper should not exceed ±3%, and the area density error should not exceed ±5%.

Coating strength: Test the bonding strength of the coating with the paper to ensure that the coating is not easy to fall off.

4.printing quality testing

Clarity and brightness: printing patterns and text should be clear and recognizable, bright and full color.

Ink adhesion: The ink should be firmly attached to the surface of the paper, not easy to fall off or blur.

Overprinting accuracy: When multi-color printing, the overprinting between different colors should be accurate.

5.Physical performance testing

Gloss: The surface gloss should meet the design requirements, and different levels of gloss correspond to different numerical ranges.

Smoothness: The smoothness of the paper surface is also one of the important indicators of quality, and the international standard stipulates that the smoothness error of coated paper should not exceed ±15%.

Water absorption and oil absorption: paper needs to absorb a certain amount of water and ink in the printing process, so water absorption and oil absorption are also important detection indicators, and the international standard stipulates that the error should not exceed ±10%.

Weather resistance: Test the weather resistance of the label paper in different environments, such as water resistance, oil resistance, high temperature resistance, cold resistance.

6.Environmental protection and safety testing

Harmful substance content: Detect whether the paper contains excessive harmful substances, such as heavy metals, volatile organic compounds, etc.

RoHS testing: For the label paper for the packaging of electronic products, RoHS testing is also required to ensure that it does not contain harmful substances.

7.Relevant standards and regulations

National standards: such as GB/T 10335.1-2017 "Coated paper and board coated art printing paper (coated paper)", etc., these standards specify the quality indicators and detection methods of coated paper.

Industry standard: Label paper for specific industries, there may be additional industry standard requirements.

Customer requirements: Different customers may have different quality requirements for label paper, so testing institutions need to develop corresponding testing programs and standards according to customer requirements.

In summary, the quality testing standards for color copperplate label paper in the industry cover many aspects such as appearance, size, material, printing quality, physical properties, environmental protection and safety to ensure that the quality of label paper meets the needs of use and relevant regulations and standards.