Dongguan plastic wrapping plastic white paper monopoly Somerset

A duplex board, generally referred to as white, pink and gray, duplex white, gray and copper. The background is gray, with a white facade coated surface, mainly for the printing and packaging, according to the material and thickness of the coated surface, duplex board is divided into a plurality of levels, often classified as Class A, Class B, C-class, E-class, class F, in descending order from high in the end, F grade the worst, also known as non-coated paper or LWC. Duplex board in tonnes for the unit of measurement, each level is divided into a plurality of weight, were divided into 200 g, 230 g, 250 g, 270 g, 300 g, 350 g, 400 g, 450 g. Here's weight represents a per square meter / gram. White paper (white board) is the degree size 787mm * 1092mm, generous paper size is 889 * 1194mm, or according to the provisions of the order contract production of other specifications or web. Since white paper fibrous tissue more evenly, and the surface layer having a filler of the rubber composition, and the surface is coated with some coating, multi-roll calender and after treatment, so relatively close cardboard texture, thickness is relatively uniform. Its paper in general are more white and smooth, with a more uniform ink absorption, surface off the powder and less hair loss phenomenon, the paper compared tough and has good folding, but its high water content , generally about 10%, there is a certain flexibility, which gives print will bring some impact. The difference between white paper and coated paper, offset paper, letterpress paper between sheets grams of that weight, relatively thick paper and different front and back colors, white paper to one side of the gray side of the white, also known as duplex coated white. Internal 737 white paper - white paper describes level by surface layers of pulp and papermaking pulp from the bottom on multiple rotary multi-cylinder paper machine or a long rotary mixing board machine. Slurry is generally divided into batter (surface layer), two, three, four layers of fiber pulp material ratio is different, and layers of pulp fiber furnish, but also according to the paper copy of quality differ. The first layer is the surface layer of pulp, high brightness requirements, have a certain strength, usually bleached pulp or * salt with addition of partially bleached chemical straw pulp and waste paper pulp white edge; the second layer is a liner for isolation the role of the surface layer and the core layer, but also requires a certain brightness, usually 100 percent mechanical wood pulp or light colored waste paper pulp; the third layer is the core, mainly from the filling effect, in order to increase the thickness of cardboard, improve stiffness, general mixed waste paper pulp or straw, which the thickest layer of quantitative high cardboard used several network linked to pulp tank several times; the last layer is the bottom, with improved paperboard appearance, improve strength, prevent curling function normally with a high rate of waste paper pulp slurry or better papermaking raw materials, cardboard underside of color than gray, but also may require the production of the bottom surface of the other colors. Basic Category coated white paper belongs to the category of packaging board, which is coated with white paint paper plate after processing by the finishing process made of cardboard. Its quantification is generally 250g / m2 or more, the thickness of 0.1mm or more, and is mainly used for single-sided color printing post-production packaging. High performance characteristics of the coating surface coated white paper coated white paper whiteness, smoothness, ink absorption and print gloss are good, paperboard itself has good stiffness and folding, so both were high-quality color offset printing and gravure printing, but also to meet the packaging requirements, it is to produce high-grade packaging boxes of high-quality materials. The basic types of common coated white paper is divided into different levels according to quality A, B, C, E, F five grades. ABC three commonly used (in some regions into AB grade, BC grade, Zhejiang Fuyang area high side). Selection, should take into account the type of product specifications and quality grade and other aspects. A type of white paper: Surface use bleached chemical pulp, the core layer and the underlying use of * salt pulp, mechanical pulp, fine paper, etc., its good folding properties, for the production of small carton. B-type white paper: bleached chemical pulp or surface using fine white paper, the core layer and the underlying use of waste paper pulp. C-type white paper: the use of more and more low-level B-type white paper raw materials.