Is a kind of positive white and smooth, the back of grey board, 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 produce other specifications as stipulated in the contracts or roll of paper. Whiteboard paper because fibrous tissue is uniform, surface layer has the packing and the composition of the rubber, and the surface coated with certain coating, 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, 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, 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, can also according to the requirements in the production of other background color.
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