The Study Of High Grade Bleaching Immersing Isolation Paper

With the rapid progress of national economy and raise of living standard, the development of electronic information industry is very fast, the range of increase excesses 20% per year, thus leads to a fast grow of printed board and cover-copper board industry. The bakelite paper of paper-based cover copper has gained rapid progress as well.The bleached bakelite paper that was used cover-copper board, also called wood pulp paper. It is made of 100% hardwood pulp and a kind of special paper after light beaten. The evenness of this paper is very good, its brightness is high, the water absorbency is excellent and its physical properties are also high. There are a few paper mills which produced middle or low-grade wood pulp paper to produce paper-based cover copper board. But the high-grade wood pulp paper that is used large-scale printing board of TV sets is all imported.Qingdao Paper mill has about ten years' experience in producing wood pulp paper. In recent years, the mill updated its technology and absorbed the advanced technology of foreign countries. This paper mill has already the capacity to produce the wood pulp paper. The production process of high-grade bleached bakelite paper has grasped by analysis, comparison and many experiments. Some key technologies are as follows: the ratio of MD tensile and CD tensile and the offset of CD basis weight are small, the evenness of whole paper is good, the stock and production environment are clean, the paper should has certain wet strength. With these technologies, the produced cover copper paper has small wrap, high fire resistance and fine color.Now the paper mill can produce the satisfying products with the existing beating equipments and paper machine. The ideal process is: the imported eucalyptus pulp, beating degree 20°SR, 1.1% wet strength additives and 0.014% chelated chemicals, Fourdrinier paper machine. The basis weight is controlled 126g/m~2, the CD weight limit is within 3g/m~2, the ratio of MD tensile and CD tensile is within 1.4, and the wet strength is above 0.4kN/m.