White paper is a kind of positive white and smooth, much for grey board on the back, the board is mainly used for single color printing is made after cartons used for packaging. White paper is magnanimous size is 787 mm * 1092 mm, or designated in accordance with the order contract to produce other specifications or paper rolls. Whiteboard paper because fibrous tissue is average, surface layer has the packing and the composition of the rubber, and the surface coated with certain coating, and through many roller pressure light processing, so the quality of a material of cardboard are close together, also compares the average thickness of, the paper generally is white and smooth, with an average of absorbency and surface off powder with less wool phenomenon, the paper is strong and has a good degree of folding, but its water content is higher, generally around 10%, there is a certain scale, it brings the certain effect to printing. White board paper and coated paper, offset paper, the difference between the halftone paper is paper, degree of heavy, thick paper. White paper is made up of MianJiang and each layer bottom slurry dryer machine or slotted in rotary screen mesh machine manufacture paper with pulp mixing board. Paste is generally divided into MianJiang ( The surface) , two, three, four layers, each layer of the pulp fiber ratio is different, and the layers of pulp fiber ratio, and according to the quality of the copy paper. The first layer of the surface plasma, which requires high whiteness, have a certain strength, usually by bleached sulphate wood pulp bleaching or with addition of department chemical straw and paper waste paper pulp; The 2nd is lining, have the effect of isolation layer and core layer, also requires a certain whiteness, usually with 100% mechanical wood pulp or waste paper pulp; light color The third layer for core layer, the main filling effect, in order to increase the thickness of the cardboard, stiffness of the progress, generally USES the mixed waste pulp or straw, this layer is the most thick, quantitative high board commonly used several net trough points a few back to hang pulp; The last layer is the bottom, have improve the look of the cardboard, progress strength, prevent curl functions, usually with high rate pulp or better as raw material to manufacture paper with pulp and paper pulp board more than bottom color gray, also can produce other bottom color as required. White cardboard is used for printing hand, cover, certificate, invitations, and packaging decoration with cardboard, white cardboard on a tablet of paper, mainly for its size: 880 mm * 1230 mm, 787 mm * 1032 mm. According to the quality level of white cardboard are divided into three grades A, B, C. White cardboard is relatively thick strong, quantitative is bigger, its quantitative 200 g/m2, 220 g/m2, 250 g/m2, 270 g/m2, 300 g/m2, 400 g/m2, and other specifications. White cardboard tightness is usually not less than zero. 80 g/m3, whiteness demand is higher, A, B, C three classes of whiteness is not less than 92 respectively. 0%, 87. 0%, 82. 0%. To prevent scouts, white cardboard requires A larger degree of sizing, A, B, C third-class sizing degree of not less than 1, respectively. 5毫米,1。 5 mm and 1. 0mm。 In order to keep the paper flat, white cardboard should be relatively thick strong, had a higher stiffness and resistance to break, the stiffness of the uneven level of different quantitative white khaki have different requirements, the greater the quantitative, the higher the rank, the greater the stiffness requirement, general longitudinal stiffness should not be less than 2. 10 - 10. 6 mn ? M, lateral stiffness should not be less than 1. 06 - 5. 30 mN? m。 A, B, C third-class burst index is not less than 2 respectively. 00KPa? m2 / g, 1。 60 KPa? M2 / g and 1. 20 KPa? m2/g。 In order to ensure the printing ink evenly and the appearance of the paper itself, the smoothness of not less than 20 - white card 40S。 In addition, white cardboard paper should level off, do not have the paper disease such as freckles and streaks, do not allow buckling deformation, paper fibre should be average, 0. 2 - 1. 5 was the dust matter in 28 / m2 ( A, etc. ) , no more than 1. 5 was of the dust. White cardboard usually takes 100% of the bleached wood pulp as raw material, the surface layer, the underlying chemical coniferous wood pulp, sulphate core layer USES the hardwood chemical mechanical pulp, pulp by beating to join the calcium carbonate, barium sulfate, such as packing, using AKD neutral heavy sizing, fold in network manufacture paper with pulp papermaking pilot, and the calender, coating processing and become, according to the need, through the embossing processing can be produced with special embossed pattern of paperboard, all with special embossed pattern of white cardboard, don't check the smoothness and whiteness. Besides white, through to the pulp dyeing, also can produce all kinds of glorious cardboard, then in addition to the whiteness, other technical functions are consistent with the function of the technology of white cardboard. Text: 1, grey coated white board paper and grey bottom liner board paper there is a difference between; 2, white cardboard and yellow core card is distinct, 3, sizing can also be ASA, such as gum rosin sizing, is not necessarily the AKD. 4, white cardboard is not necessarily the pile of paper machine net can be produced.
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