White paper is positive with a white and smooth, grey board, on the back of this paper is mainly used for single color printing paper box is made after for synthetic, or design, handmade products. White paper is size is 787 mm * 1092 mm, magnanimous paper size is 889 * 1194 mm, or produce other specifications as stipulated in the contracts or roll of paper. White paper because fibrous tissue is uniform, surface layer has the packing and the composition of the rubber, and the surface coated with paint, and through multiple roll calender processing, so the quality of a material of cardboard more closely, thickness is uniform. The paper generally is white and smooth, with a uniform ink absorbency, and dropping off powder surface phenomenon, less paper is strong and has a good degree of folding, but its water content is higher, generally around 10%, there is a certain scale, the printing will bring certain influence. White board paper and coated paper, offset paper, the difference between the halftone paper is paper, degree of positive and negative heavy, paper, thick and different colors, white board paper for a grey one side white, also known as grey coated white. Conventional whiteboard paper gram weight: 230 g/m2, 250 g/m2, 270 g/m2, 300 g/m2, 350 g/m2, 400 g/m2, 450 g/m2, 500 g/m2, white board paper used tablet specifications: is 787 * 1092 mm, magnanimous, 889 * 1194 mm white board paper used drum specifications: 26 '/ 28'/'/' 33 31/35 '/ 36' 38 '/ 40'/' / 47 '43 other prescribed size can order large quantities of white board 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, or with addition of some bleaching 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, to improve the stiffness, generally USES the mixed waste pulp or straw, this layer is the most thick, quantitative high board commonly used several net trough points several times to hang pulp; The last layer is the bottom, have improve the look of the board, increase 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 according to the requirements of other background color or white board paper, 300 g is mainly used in the wrapping of the wine box
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