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Discussion on white paper and white cardboard specific differences

by:NEW BAMBOO PAPER     2020-10-04
A lot of people asked this topic, what is the difference between the white paper and white cardboard? Feel bad for a matter of the today we give everybody to share the difference between a white paper and white cardboard, after you finish see later will know how to distinguish the white paper and white cardboard. 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 of 78 respectively. 7cm*109. 2 cm, and 88. 9cm*119. 4 cm, or according to the order of the contract defined yield out other specifications or reel paper. Usually have a roll and flat, it can according to customer's requirements. Average, whiteboard paper due to fibrous tissue surface of packing and the reason of the rubber, and the surface coated with some paint, and through many roll calender processed, so the quality of a material of cardboard more closely, average thickness is more, the paper generally compare white and smooth, with an average of absorbency and surface pollen and wool phenomenon is very few, paper is tough and has good folding degree, but the moisture content is higher, generally around 10%, there is a certain scale, it brings the certain effect to printing. Ogre made paper here by the way, give us the white board paper and coated paper, offset paper, the difference between the halftone paper is paper, degree of heavy paper is thick. After this you can slowly to find after contact. 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. The process seems to be more complex. 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. So here we respectively about the composition of the four layers. The first layer of the surface plasma, which requires high whiteness, have a certain strength, generally USES the bleached sulphate wood pulp bleaching or with addition of department 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, stiffness of the progress, generally USES the mixed waste pulp or straw, this layer is the most thick, quantitative high board commonly used several net trough points a few back to hang pulp; The last layer is the bottom, have improve the look of the cardboard, progress 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 other bottom color as required. Through the introduction of the white board every layer, I think we should also learn more thoroughly, let's explain in detail the white cardboard. White cardboard is used for printing hand, cover, certificate, invitations, and packaging decoration with cardboard, 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. A, B, C of the three we will talk about some of its technical indicators respectively below. 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. 0%, 87. 0%, 82. 0%. 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毫米,1。 5 mm and 1. 0mm。 In order to keep the paper flat, white cardboard should be relatively thick strong, had a higher stiffness and resistance to break, the stiffness of the uneven level of different quantitative white khaki have different requirements, the greater the quantitative, the higher the rank, the greater the stiffness requirement, general longitudinal stiffness should not be less than 2. 10 - 10. 6 mn ? M, lateral stiffness should not be less than 1. 06 - 5. 30 mN? m。 The surface below we talk about their three burst index and what is the need to take care of that. A, B, C third-class burst index is not less than 2 respectively. 00KPa? m2 / g, 1。 60 KPa? M2 / g and 1. 20 KPa? m2/g。 In order to ensure the printing ink evenly and the appearance of the paper itself, the smoothness of not less than 20 - white card 40S。 In addition, white cardboard paper should level off, do not have the paper disease such as freckles and streaks, do not allow buckling deformation, paper fibre should be average, 0. 2 - 1. 5 was the dust matter in 28 / m2 ( A, etc. ) , no more than 1. 5 was of the dust. It is conceivable that some of white cardboard is very demanding. We should pay attention to some. 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 by beating to join the calcium carbonate, barium sulfate, such as packing, using AKD neutral heavy sizing, fold in network manufacture paper with pulp papermaking pilot, and the calender, coating processing and become, according to the need, through the embossing processing can be produced with special embossed pattern of paperboard, all with special embossed pattern of white cardboard, don't check the smoothness and whiteness. Besides white, through to the pulp dyeing, also can produce all kinds of glorious cardboard, then in addition to the whiteness, other technical functions are consistent with the function of the technology of white cardboard. The above content is some difference between white paper and white cardboard, you can slowly, in reality, much contact, natural can distinguish out.
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