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The white board has a size of 787mm * 1092mm, a size of 889mm * 1194mm, or other specifications or webs as specified in the contract.
White paper because the fiber structure is relatively uniform, the surface layer with filler and the composition of the compound, and the surface coated with a certain coating, and after multi-roll calendering, so the packaging cardboard boxes texture is relatively tight, the thickness is relatively uniform. Its paper is generally more white and smooth, with a more uniform ink absorption, surface powder and hair loss phenomenon is less, paper is more tough and has a good folding resistance, but its high water content , Generally about 10%, there is a certain degree of flexibility, which will bring a certain impact on the printing. White paper and coated paper, offset paper, letterpress paper is the difference between the paper grams of heavy, relatively thick paper and positive and negative colors are different, white paper for a side of the white side, also known as gray undercoat white.
White paper is made from the pulp and the bottom of the pulp in the multi-round multi-dryer paper machine or long round net mixed paper board machine made of copy. The pulp is also generally divided into the pulp (surface layer), two layers, three layers, four layers, each layer of paper pulp fiber ratio is different, and each layer of pulp fiber ratio, and according to the paper Quality is different.
The first layer for the surface layer of pulp, requiring high brightness, with a certain strength, usually using bleached kraft pulp or with some bleached chemical pulp and white paper waste paper pulp; the second layer for the lining, Surface layer and the role of the core layer, also requires a certain degree of whiteness, usually with 100% mechanical wood pulp or light-colored waste paper pulp; the third layer for the core layer, mainly from the filling effect to increase the thickness of cardboard, The use of mixed waste paper pulp or straw pulp, this layer of the thickest, high-quality cardboard commonly used several slots in several times hanging pulp; the last layer is the bottom, with improved cardboard appearance, improve strength, to prevent curling function, usually With high-yield pulp or better waste paper pulp as raw material, cardboard surface color gray, can also be required to produce other bottom color.