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Coated Duplex Board Printing Skills
Jul 04, 2017

Coated Duplex Board Printing skills

Printing techniques and precautions for single and double coated whiteboards

1, the concentration: the concentration of ink in the printing ink in the use of relatively small, ink is better; low concentration of ink in the printing of ink use more, ink light;

2, fineness: the size of the ink particles, the ink fineness is high; ink concentration, print outlets clear, full and powerful; ink fineness is low, print outlets easy hair,

3, viscosity, viscosity, easy to cause uneven ink, dotted hair and flower and other phenomena; viscosity is small, easy to cause ink emulsification and layout floating dirty;

4, mobility: mobility, will make the level of illustrations unknown, ink is not full; mobility is small, so that the spread of ink is not smooth, uneven, easy to cause in the same printing surface before the deep after the light or light Deep after the phenomenon;

5, light resistance: good light resistance of the ink, printed products, colorful, graphic network full, strong, rich three-dimensional, and can be long-term preservation; poor light resistance of the ink, printed product color is easy to light, dark;

6, water resistance, acid resistance, alkali resistance: the offset printing ink, pay special attention to its water resistance, acid, alkali resistance, water and acid, alkali-resistant ink, printed products bright color, structured, ; Water, acid, alkali, poor ink, printed products, gray and weak, the level is unknown, the network is not clean.

White board generally requires a close texture, smooth surface, the same thickness, the paper is not lint, good absorption and expansion rate is small, to meet the requirements of multi-color overprint. In order to fit the requirements of the box, white paper should have a large degree of stiffness, strong folding characteristics. The main technical indicators of domestic single-sided whiteboard paper are quantitative, tight, sizing, smoothness, whiteness, horizontal folding, lateral stiffness, dust and moisture.

Single-sided coated white paper is a white and smooth white, the back of the gray for the end of the cardboard, it is also known as gray-white paper or gray-coated white paper, but also referred to as gray at the end of white, single white , White cardboard and so on. This cardboard is mainly used for single-sided color printing made of paper for packaging use. Flat sheet white plate size is 787mm * 1092mm, the size of 889mm * 1194mm, drum width 787mm, 889mm, 1092mm, 1194mm, customers can also need to arrange the production of other specifications of the paper.

Coated white paper because the fiber structure is relatively uniform, the surface layer with filler and the composition of the compound, and the surface coated with a certain coating, and after the multi-roll calendering, so the cardboard texture is relatively tight, the thickness is relatively uniform, the paper The surface is generally more white and smooth, with a more uniform ink absorption, surface powder and hair loss phenomenon is less, paper is more tough and has a good folding resistance, the water content is generally about 8% , There is a certain degree of flexibility, which will bring some impact on the printing. White paper and coated paper, offset paper, letterpress paper is the difference between the paper grams of heavy, the paper is relatively thick. White paper pulp is generally divided into the pulp (surface layer), two, three, four, each layer of pulp fiber ratio is different, and each layer of pulp fiber ratio, The quality of paper is different. The first layer for the surface layer of pulp, requiring high brightness, with a certain strength, usually using bleached kraft pulp or with some bleached chemical pulp and white paper waste paper pulp; the second layer for the lining, Surface layer and the role of the core layer, also requires a certain degree of whiteness, usually with 100% mechanical wood pulp or light-colored waste paper pulp; the third layer for the core layer, mainly from the filling effect to increase the thickness of cardboard, The use of mixed waste paper pulp or straw pulp, this layer of the thickest, high-quality cardboard commonly used several slots in several times hanging pulp; the last layer is the bottom, with improved cardboard appearance, improve strength, to prevent curling function, usually With a high rate of pulp or a good waste paper pulp as raw materials, cardboard surface color gray, can also be required to produce other bottom color.