Coated paper is a high-quality printing paper known for its high-quality surface finish and printing effect. It is usually used for the printing of high-quality books, magazines, picture albums, greeting cards and other cultural publications, as well as high-end packaging, business cards, etc. In the manufacturing process of coated paper, a coating process is usually used to coat the surface of high whiteness paper with a layer of adhesive and white filler, so as to obtain a smooth surface and printing effect.
The detection of coated paper needs to pay attention to the following main properties:
Thickness and density: The thickness and density of coated paper will directly affect its stability and printing effect. Detection of thickness and density can be carried out by measuring indicators such as paper thickness, density and basis weight.
Smoothness: Coated paper needs to have a very smooth surface to ensure clarity and detail in text and images. The detection of smoothness can be carried out by measuring the smoothness of the paper surface, the height of hairiness and the convexity of the board.
Whiteness: Coated paper needs to have a certain whiteness to ensure the color reproduction and contrast of printed text and images. The detection of whiteness can be carried out by measuring the color temperature and color difference of the reflected light of the paper.
Gloss: Coated paper needs to have a certain gloss to enhance the visual effect of printed matter. The detection of gloss can be carried out by measuring the reflectance of the paper surface.
Strength: Coated paper needs to be strong enough to withstand the tension and pressure of the printing process. The detection of strength can be carried out by measuring the tensile strength, tear strength and compressive strength of paper.
Printing performance: Coated paper needs to have certain printing performance to ensure the printing quality of printed matter. The detection of printing performance can be carried out by measuring the water absorption, oil absorption, printing clarity, color reproduction and printing pollution resistance of paper and other indicators.
Environmental protection: Coated paper needs to meet environmental protection standards, contain no harmful substances, and have no pollution to the environment. The detection of environmental protection can be done by measuring the volatile organic compounds, heavy metals, chloride ions and fluorescence of paper
Light brightener and other indicators to carry out.
Adhesive strength: The surface of coated paper is coated with a layer of adhesive and white filler, so its adhesive strength also needs to be tested to ensure that the filler on the surface of the paper is not easy to fall off. The detection of adhesive strength can be carried out by measuring the peel strength, cutting strength and ring pressure strength of paper.
Copper plated layer: Coated paper is characterized by a layer of copper and light plating on its surface to obtain good gloss and smoothness, so the quality and uniformity of the copper plated layer of coated paper also need to be tested. The detection methods include thickness measurement of copper plating layer, surface quality detection and microstructure analysis, etc.
The above performance indicators are the key content of coated paper testing, and different use requirements and standards will also affect the testing standards and methods of paper.
