Zhejiang Dongda Paper Co.,Ltd
Add:Gaoyang Village, Chunjiang Avenue, Fuyang District, Zhejiang Province, 311421 China
Coated Duplex Board White Back Fibrous tissue
White paper as a result of relatively uniform fiber structure, 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 cardboard texture is relatively tight, the thickness is relatively uniform, the paper in general The case is 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, but its high water content, generally in 10 % Or so, there is a certain degree of flexibility, which will bring a certain impact on the printing.
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 paperboard machine made of copy. The slurry is also generally divided into the pulp (surface layer), the second layer, the third layer, the four layers, the paper pulp ratio of the layers is different, and the fiber ratio of each layer of pulp, Quality is different.
The first layer for the surface layer of pulp, requiring high whiteness, with a certain strength, usually using bleached kraft pulp or with part of the 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 a high rate of pulp or better waste paper pulp as raw material, cardboard color below the gray, but also according to the requirements of the production of other bottom color.
White cardboard, double glue paper is used for printing business cards, cover, certificate, invitations and packaging and decoration with a cardboard, white cardboard for the flat paper, its size is: 880mm * 1230mm, 787mm * 1032mm. According to the quality level white cardboard is divided into A, B, C three and so on.
White cardboard is thicker and firmer, and its mass is 200 g / m2, 220 g / m2, 250 g / m2, 270 g / m2, 300 g / m2, 400 g / m2 and so on. White cardboard tightness is usually not less than 0.80 g / m3, whiteness requirements are higher, A, B, C three degrees of whiteness were not less than 92.0%, 87.0%, 82.0%. In order to prevent swimming, white cardboard requires a greater degree of sizing, A, B, C three sizing degrees were not less than 1.5mm, 1.5mm and 1.0mm. In order to maintain the formation of paper products, white cardboard should be thicker and stronger, there is a high degree of stiffness and bursting strength, for different levels of different quantitative white card has a different degree of stiffness requirements, the greater the amount, the higher the level, The greater the lateral requirements, the general longitudinal stiffness should be not less than 2.10-10.6mN • m, the lateral stiffness should be not less than 1.06-5.30 mN • m.
A, B, and C were not less than 2.00 kPa • m2 / g, 1.60 KPa • m2 / g and 1.20 KPa • m2 / g, respectively. In order to ensure uniform distribution of ink and the appearance of the paper itself, white card smoothness of not less than 20-40S. In addition, white cardboard paper should be flat, not allowed to have spots and stripes and other paper disease, does not allow warping deformation, paper fiber organization should be uniform, 0.2-1.5mm2 dust no more than 28 / m2 (A ), No more than 1.5mm2 of dust.
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