In general, double gray cardboard optical performance index is more important for the printing paper and tracing, transparency can be represented with the degree of light through a paper, is also to sample can see clear ink line on the number of layers. And opacity is based on a single sample in the full absorption of black pad on the ability of reflection, said with fully opaque a number of sample reflection ability expressed as a percentage. And baidu is white, or close to white paper surface emissivity of blu-ray, use relative to the standard of magnesium oxide board reflectivity percentage said. In addition, gray paper physical performance indicators are based on quantitative, thickness, density, porosity and porosity, the expansion rate and strength. The gelatine printing paper on expansion rate is higher, not only that the strength indexes of wrapping paper is particularly important, such as elongation, burst, stiffness, folding degrees and tear is the inspection standard.
Most people who see a in operation for the first time are amazed at how well the paper board manufacturers is managed.
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