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Card Board High Stiffness
Oct 11, 2017

Card Board High stiffness

The card board is relatively thick and firm, with a large quantity, and its quantitative quantity is 200g/m2, 220g/m2, 250g/m2, 270g/m2, 300g/m2, 400g/m2, etc. Card tightness is usually not less than 0.80 g/m3, and the degree of degree of A, B and C is not less than 92.0%, 87.0% and 82.0% respectively. In order to prevent swimming water, the card board requires A large sizing, and the sizing of A, B and C is not less than 1.5mm, 1.5mm and 1.0mm respectively. To keep the paper level off, the card board should be relatively thick strong, had a higher stiffness and resistance to break, for different grades of different quantitative khaki stiffness have different requirements, the bigger the quantitative, the higher the rank, the greater the stiffness requirement, general longitudinal stiffness should be not less than 2.10 to 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 2.00KPa•m2/ g, 1.60 KPa•m2/g and 1.20KPa•m2/ g. In order to ensure the uniform distribution of ink and the appearance of the paper itself, the smoothness of the card is not less than 20-40S. In addition, the paper card board should level off, there is no spots and streaks of disease, the paper 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.

Card board usually takes 100% of the drift 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 embossed with a special pattern of card board, all with special embossed pattern card board, can not check the smoothness and degrees. In addition to color, by dyeing the slurry, we can produce all kinds of color card plates. Besides, other technical performances are consistent with the technical performance of the card board. Sheet of paper is made up of a variety of plant fiber interweave each other and become a reticular structure, in this kind of mesh structure, pore between fiber and then add some filler, rubber, ink to meet should have the characteristics of the paper itself. Adding filler is to improve the degree, smoothness and opacity of paper. Add glue is to make paper have certain resistance to water, not easily infiltrate by water or other liquid; Add the color material to make the sheet paper have a higher degree. The pore structure of sheet paper is the basis for paper to absorb ink, which is one of the key factors for the infiltration and drying of newspaper printing. Therefore, to understand the ink absorption of paper, we must first understand the pore structure of paper. Because of the pore structure of sheet paper and ink penetration, penetration speed, printing smoothness, ink penetration solidification and drying and the quality of printed matter have close relationship.

Board paper mainly includes the paper porosity, pore structure of the paper volume of the air inside the void fraction said paper and paper volume ratio, the void fraction of paper can be obtained by calculation method and experimental measurement. Board paper ratio = the gap within the volume of air (per unit area)/paper volume (per unit area) x100 % from the above equation, the board of the air inside the volume, the greater the show board paper porosity is higher, it also verified the board paper pore structure of the situation, the less paper fiber, mixed more hydrophobic, the greater the gap between the fiber and board paper pore structure is the worse. Conversely, the more paper fiber, the more densely interwoven, the smaller the gap between the fibers, the better the pore structure of the plate paper.