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 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 (
, 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.
A layer of 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;
Next layer is the bottom, have improve the look of the board, increase strength, prevent curl functions, usually with high rate pulp or better waste pulp as raw material to manufacture paper with pulp and paper board more than bottom color gray, can also according to the requirements in the production of other background color.
White cardboard is used for printing business card, envelope, certificates, invitation CARDS and wrapping paper, 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.
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 mm and 1.
In order to keep the paper flat, white cardboard should be relatively thick strong, had a higher stiffness and resistance to break, for different grades of different quantitative white khaki have different requirements, the stiffness of the quantitative, the greater the level is higher, the greater the stiffness requirement, general longitudinal stiffness should not be less than 2.
6 mn ?
M, lateral stiffness should not be less than 1.
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