Do not think that the black card is simply covered with a layer of black paper jam up. Usually people call black cardboard, double-sided black cardboard through the heart, through the heart of all refer to the double-sided black cardboard. This black card is from the inside to the outside is black. In the manufacture of pulp process has been tuned color, shape after black. Another is the single black card, also known as duplex black card. Duplex black cardboard is black on one side, black cardboard Guancheng, a special cardboard jams side. Usually used for mounted, make use of the box. This is why the other side of the black card to be inflicted on one side rough cardboard, easy pasting. Black cardboard formerly was intended to quantify as a benchmark, duplex single black cardboard, division: paper, cardboard and paperboard; early in the Shanghai shopping malls around the quantitative 200g / sqm white thick paper (surface smoothness, calendered , high stiffness, also called thin cardboard), call, said heavy paper. In fact, it is also a paper jam. The most common of the jam without color, often called white cardboard. If the color, depending on the color called colored cardboard. White cardboard name "white" Supply of black cardboard, whiteness so demanding, A, etc. whiteness of not less than 92%, B, which are not less than 87%, C, which are not less than 82%. Whiteness of more than 90%, a little "glittering" was. Supply of black cardboard _ million Nobuhiro Paper (Online) _ PR black cardboard provided by the Dongguan City billion letter macro Paper Limited. Dongguan City billion Nobuhiro Paper Co., Ltd. (www.yixinhong.com) is Dongguan, jams leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Paper macro billion letters in leadership with the staff warmly welcome all inquiries negotiations to create a million letter macro paper better future.