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The white board has a positive size of 787mm * 1092mm, a large size of 889mm * 1194mm, or other specifications or webs as specified in the ordering contract.
Whiteboard paper as the fibrous tissue is more uniform, the surface layer with filler and rubber composition, and the surface coated with a certain coating, and after calendering, so the texture of cardboard is relatively close, the thickness is relatively uniform. The paper is generally white and smooth under normal circumstances, with more uniform ink absorption, the surface less powder and hair loss less paper tough and have better resistance to folding, but its higher water content , Generally about 10%, there is a certain degree of flexibility, which will bring some impact on printing. Whiteboard paper and coated paper, offset paper, letterpress paper between the difference between the gram grams of paper weight, thick paper and positive and negative color, white paper side of the gray side, also known as gray coated white.
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Whiteboard paper is made from the pulp and layers of pulp in the multi-cylinder dryer cylinder paper machine or cylinder mixed paperboard made. Slurry is generally divided into flour paste (surface layer), two, three, four layers, the layers of pulp material fiber ratio is different, and the fiber ratio of each layer of pulp, but also according to the papermaking The quality is different.
The first layer of the surface layer of pulp, requiring high brightness, with a certain intensity, usually with bleached kraft pulp or with part of bleached chemical pulp and white paper waste side pulp; the second layer lining, play isolation The role of the surface layer and the core, but also requires a certain degree of whiteness, usually with 100% mechanical pulp or light-colored waste pulp; the third layer is the core layer, the main filling role in order to increase the thickness of cardboard to improve the stiffness, The general use of mixed waste paper pulp or straw pulp, this layer of the thickest, high-quantitative cardboard commonly used several slot several times linked to pulp; the last layer is the bottom, with the appearance of cardboard, improve strength, prevent curling function, usually High-yielding pulp or better waste paper pulp as a raw material, the color of the bottom of the cardboard gray, but also can produce other requirements according to the bottom color.