Study On APMP Pulping Of Triploid Chinese White Poplar

All kinds of pulping processes are developed presently. The chemimechanical pulping is a very important method nowadays. Already in the 18th century, Friedrich Gottlob Keller (1816-95) and Charles Fenerty (1821-92) are credited independently with the discovery of wood grinding and the first mechanical pulp suitable for papermaking. As we look back on the history of technical developments, we can recognize that RMP, TMP, CTMP and BCTMP are developed one by one. APMP is a new chemimechanical pulping process based on BCTMP process.It has become necessary requirement for modern paper industry itself and the development of economic law to use wood as main raw material. Triploid Chinese Poplar (TCWP) is a kind of new tree-types, which cultivated by the Research Room White Poplar, BJFU. The merits of TCWP are fast growing, high quality and short timber periods, which could promote the course of integration of forest-paper and establish the fundamental of continuable developing of papermaking industry in China.In the paper, the fiber configuration and chemical composition of TCWP are studied. The chemical conditions of the APMP pretreatment are also researched. At the same time, comparison of the juvenile Triploid Chinese Poplar in Saline Soil and Normal 5-year Poplar on APMP Pulping properties are studied.The results showed that the fiber length of TCWP is longer and the fines content is less than other poplars. TCWP is chemically different from normal poplar with a clearly lower lignin, and higher cellulose content.The suitable chemical doses used in the pretreatment were: hydrogen peroxide (2.0/4.0%), sodium hydroxide (4.0/2.0%). In addition some DTPA, sodium silicate and Epsom salt are added for stabilizing peroxide.The studies showed that the saline environment has no obvious effect on TCWP growing and APMP pulping properties but has some effects on chemical composition.