... and strong resistance to water, can effectively prevent the paper when the multi-color overprinting deformation, dislocation, nap, ... to maintain purity. Called offset paper. Usually Web, there are flat paper. Quantification is 55 ~ 150g / m2. Paper-white, smooth, no impurities ... a more complex, higher requirements for printing paper. Offset printing paper for general use bleached chemical wood pulp, ...