White cardboard is a kind of strong and thick paper with large quantities. Once upon a time, some people planned to divide paper, cardboard, and paperboard according to their ration. In the early years, in Shanghai shopping malls, a white thick paper with a ration of about 200g / m2 (smooth surface, calendered, high stiffness, also known as thin paperboard) was called weighing paper. In fact, it is also a kind of paper jam. The most common card does not color, commonly known as a white card. If the color, according to the color called color card.
The main purpose of white card paper is to print business cards, certificates, invitation cards, covers, calendars, and postcards.
White card paper surnamed "white", so the whiteness requirements are very high, whiteness is not less than 92%, B whiteness is not less than 87%, C whiteness is not less than 82%. If the whiteness exceeds 90%, it's a little "bright".
White card paper also requires high stiffness, bursting resistance, and smoothness (except for white card paper with an embossed pattern). The paper surface shall be smooth, free of streaks, spots, and other paper defects, and free of warpage and deformation.
The market for white cardboard in China is good. In the past, many foreign hotels and joint ventures used white cardboard imported from abroad. Nowadays, the rise of the Ningbo Zhonghua paper industry has changed the situation that imported paper dominates China's white cardboard market. Ningbo Zhonghua Paper Co., Ltd. adopts bleached chemical wood pulp, first-class processing equipment, and advanced technology. Therefore, the quality of finished products is extremely excellent, comparable with imported products, while the price is far lower than imported products.
The single copper paper has a bright surface, uniform coating, fast ink absorption, good printability, and fine color printing. For the purpose of fine printing, the surface of the base paper is coated and polished by a supercalender.
Double copper paper is divided into one-sided coated paper and double-sided coated paper. According to the Japanese paper classification standard, the coating amount of each side is more than 10g / m2. It is one of the most commonly used papers in the cultural publishing, advertising design, printing and binding, and industrial and commercial industries.