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

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

First, basic physical properties

Thickness: Using an electronic micrometer to measure coated paper, the international thickness deviation is usually required within ±2%, and the domestic requirement is within ±3%.

Density: The density meter is used to measure the coated paper to ensure that the density of the paper is uniform to ensure the consistency of the printing effect.

Water absorption: The coated paper is soaked in water at a specific temperature for a period of time to measure its water absorption to assess the stability of the paper in a humid environment.

Smoothness: The smoothness meter is used to measure the coated paper, and the uniformity is usually required within 5% internationally, and the domestic requirement is within 6% to ensure the color level and visual effect of the print.

Second, optical performance

Gloss: Through the gloss meter detection, the international general requirements of its gloss above 70%, while the domestic according to different uses and requirements, gloss requirements between 60-80%. High gloss helps to enhance the brightness and texture of the print.

Whiteness (brightness) : Use an optical whiteness meter to measure the whiteness and reflection performance of the paper to ensure the color reproduction degree and visual effect of the print.

Third, printing performance

Printability: Evaluate the paper's absorption of ink, drying speed and whether it is prone to hair pulling and powder dropping during the printing process.

Color Reducibility: Use color management equipment to evaluate the color accuracy of the print effect and ensure that the print is consistent in color with the original manuscript.

Fourth, environmental adaptability

Temperature and humidity changes: Evaluate the performance changes of paper under different temperature and humidity conditions to ensure its stability and durability under various environmental conditions.

Fifth, other special properties

Folding resistance: Simulate the folding performance of the paper under folding conditions to ensure the durability of the label paper during use.

Tensile strength: Evaluate the tensile strength of the paper to prevent breakage during use or transportation.

Environmental performance: Detect harmful substances that may be contained in the paper, such as heavy metals, fluorescent agents, etc., to ensure that it meets environmental requirements.

These quality testing standards together constitute the quality assurance system of color copperplate label paper, which helps to improve the quality and beauty of printed matter, while meeting the needs of environmental protection and use. In the actual testing process, it can be selected and adjusted according to the specific product requirements and standard specifications.