Zhejiang Dongda Paper Co.,Ltd
Add:Gaoyang Village, Chunjiang Avenue, Fuyang District, Zhejiang Province, 311421 China
Card Board Thick strong
White card paper is for printing business card, cover, certificate, invitation card and packaging decoration paper. The size of the paper is: 880mm * 1230mm, 787mm * 1032mm. The paper is divided into A, B and C.
The white card paper is more solid and firm, with a large quantity, and its quantitative quantity is 200g/m2, 220g/m2, 250g/m2, 270g/m2, 300g/m2, 400g/m2, etc. White card paper compactness is usually not less than 0.80 g/m3, the whiteness requirement is higher, the whiteness of A, B and C is not less than 92.0%, 87.0% and 82.0% respectively. In order to prevent swimming water, white card paper requires A large sizing, and the sizing of A, B and C is not less than 1.5mm, 1.5mm and 1.0mm respectively. 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 2.10 10.6 mN, m, lateral stiffness should be not less than 1.06 to 5.30 mN, m.
The breaking index of A, B and C is not less than 2.00 KPa • m2 / g, 1.60 KPa • m2 / g and 1.20 KPa • m2 / g. The smoothness of the white card is not less than 20-40S in order to ensure the uniform distribution of ink and the appearance of the paper itself. In addition, white cardboard paper should level off, there is no spots and streaks paper disease, does not allow buckling deformation, paper fibre should be uniform, 0.2-1.5 the dust was not more than 28 / m2 (A), 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 after beating add calcium carbonate, barium sulfate, such as packing, using AKD neutral heavy sizing, manufacture paper with pulp on the pile of paper machine net, and the calender, coating processing and become, according to the needs, through embossing processing can produce with special embossed pattern of paperboard, all with special embossed pattern of white cardboard, don't check the smoothness and whiteness. In addition to white, it can also produce all kinds of colored paper by dyeing the paste, and the other technical performance is consistent with the technical performance of the white card paper. A few years ago the white paper is made up of MianJiang and each layer bottom slurry dryer machine or slotted in rotary screen net machine manufacture paper with pulp mixing board, but with the progress of papermaking technology, at present mostly adopts the folding machine, rotary screen paper machine has been eliminated slowly.
Slurry is usually divided into MianJiang (surface), line (2), core plasma (three layers), back pulp layer (4), the layers of pulp fiber ratio is different, and the layers of pulp fiber ratio, and according to the quality of the copy paper.
The first layer is the surface slurry, which requires high whiteness, which has certain strength, usually bleached sulphate wood pulp or mixed with partial bleaching chemical straw pulp and white paper pulp; The second layer is the lining layer, which ACTS as the insulating layer and the core layer. It also requires a certain whiteness, usually with 100% mechanical wood pulp or light colored paper pulp; 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 a high yield 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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